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- Akademienvorhaben Census of Antique Works of Art and Architecture Known in the Renaissance (14)
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- Akademienvorhaben Strukturen und Transformationen des Wortschatzes der ägyptischen Sprache. Text- und Wissenskultur im alten Ägypten (6)
The paper addresses the formation of striking patterns within originally near-homogenous tissue, the process prototypical for embryology, and represented in particularly puristic form by cut sections of hydra regenerating a complete animal with head and foot. Essential requirements are autocatalytic, self-enhancing activation, combined with inhibitory or depletion effects of wider range - “lateral inhibition”. Not only de-novo-pattern formation, but also well known, striking features of developmental regulation such as induction, inhibition, and proportion regulation can be explained on this basis. The theory provides a mathematical recipe for the construction of molecular models with criteria for the necessary non-linear interactions. It has since been widely applied to different developmental processes.
Together with their wives Otto and Richard Schomburgk arrived in Port Adelaide (South Australia) on August 16th 1849. The essay looks at how these two brothers, who had received their scientific training and promotion in the circle surrounding Alexander von Humboldt, reacted to the unfamiliar conditions in the young British colony. Some indication will be given as to the differences between the Schomburgk brothers treatment of the natural resources of the new colony and that of the English colonists of the time.
The computer has come to play a transformative role in the ways we model, store, process and study text. Nevertheless, we cannot yet claim to have realised the promises of the digital medium: the organisation and dissemination of scholarly knowledge through the exchange, reuse and enrichment of data sets. Despite the acclaimed interdisciplinary nature of digital humanities, current digital research takes place in a closed environment and rarely surpasses the traditional boundaries of a field. Furthermore, it is worthwhile to continue questioning the models we use and whether they are actually suitable for our scholarly needs. There’s a risk that the affordances and limitations of a prevailing model may blind us to aspects it doesn’t support.
In her talk, Elli Bleeker discusses different technologies to model data with respect to their expressive power and their potential to address the needs of the scholarly community. Within this framework, she introduces a new data model for text, Text-As-Graph (TAG), and it’s reference implementation Alexandria, a text repository system. The TAG model allows researchers to store, query, and analyse text that is encoded from different perspectives. Alexandria thus stimulates new ways of looking at textual objects, facilitates the exchange of information across disciplines, and secures textual knowledge for future endeavours. From a philosophical perspective, the TAG model and the workflow of Alexandria raise compelling questions about our notions of textuality, and prompt us to reconsider how we can best model the variety of textual dimensions.
The creation of a representation official park of nationwide scale and importance is hedged about with a lot of difficulties. It is supposed to be a paragon of beauty and utility while also being an epoch’s monument remaining in place for long decades or centuries. The paper analyses the balance between the beauty and sustainability in the conception and the actual life of eight parks in the realm of Russian culture (Russian Empire, Soviet Union, Russian Federation). That said, one of them (House of Bezborodko) represents an unconsummated project, but one that is typical of its epoch.
The present study explores whether regional water resources can be used more efficiently by Brandenburg’s farming systems. A description of agriculture in Brandenburg today is followed by a systematic analysis of measures to raise the water efficiency. Brandenburg’s agricultural systems are divided into three sections: soil, plant production and livestock farming. Within these sections measures to increase water efficiency are listed and analysed with reference to five objective criteria for raising water use efficiency. In view of the complexity of farming systems in Brandenburg, general measures to raise water use efficiency could not be derived. Site-specific tillage practices and crop patterns adjusted to recent weather conditions may reflect the specific diversity of Brandenburg more efficiently.
The article provides historical background for Alexander von Humboldt’s expedition into Russia in 1829. It includes information on Humboldt’s works and publications in Russia over the course of his lifetime, as well as an explanation of the Russian scientific community’s response to those works. Humboldt’s ideas on the existence of an active volcano in Central Asia attracted the attention of two prominent Russian geographers, P.Semenov and P.Kropotkin, whose views on the nature of volcanism were quite different. P.Semenov personally met Humboldt in Berlin. P. Kropotkin made one of the most important geological discoveries of the 19th Century: he found the fresh volcanic cones near Lake Baikal. Soon after Humboldt’s Russian expedition, and partly as a result of it, an important mineral was found in the Ilmen mountains - samarskite, which later gave its name to the chemical element Samarium, developed in 1879. At the beginning of the 20th Century, the Russian scientist V.Vernadskiy pointed out that samarskite was the first uranium-rich mineral found in Russia.
Alexander von Humboldt’s descriptions of volcanic mountains in his travel journals (Reise auf dem Río Magdalena, durch die Anden und Mexico) show both his reliance on and impatience with literary conventions and travel narratives. Using Goethe’s Italienische Reise and Bürger’s Münchhausen as points of comparison for literary treatments of the volcano ascent, Humboldt’s process of writing is examined. Humboldt shows the failure of the existing discourse and begins to experiment with narratives which fragment and recombine personal and historical modes of writing with, in this case, images from new technical inventions which visualize landscape according to fundamental scientific principles. While the inclusion of scientific prose is relevant, Humboldt’s link to modernity is based on experimental narrative techniques which draw upon changing sets of discourse practices to describe complex realities.
Over millennia human well-being has benefited from ecosystems, not only through tangible goods, but also through intangible assets known as cultural ecosystem services. Despite growing research over the last decade, cultural services assessment still remains arbitrary and is largely limited to marketable services such as tourism. Evident difficulties in standardizing definitions and measurements have challenged cultural services accounting in decision making processes. However, the imminent formation of the Intergovernmental Platform on Biodiversity and Ecosystem Services offers an opportunity to counterbalance this misrepresentation by establishing a scientific basis for consistently assessing cultural services. In that regard, the current review intends to facilitate discussion investigating the current state of cultural services accounting by offering an appraisal of existing evidence regarding cultural services indicator quality. The current review builds on scientifically recognized frameworks to develop a holistic understanding of how cultural services indicators are conceived within ecosystem services research. Among the measures found, benefit indicators were most frequently used for assessing inspirational, educational and recreational services. A broad variety of methods for accounting cultural services was found, mainly due to the varied aims of the studies. Most of the cultural services indicators were deficient concerning their clarity of definitions, purposes and understanding of the processes to be measured and referring only marginally to tradeoffs and bundles with other services. Only 17% performed multitemporal assessments and 23% used spatially explicit information. It seems that cultural services indicators quality could be greatly enhanced by investing more effort towards involving relevant stakeholders in conceptualization and communication phases, using participatory mapping tools to enhance visibility.
For decades, water resources have been used intensively for drinking water, industry, agriculture and energy production. This paper summarises the main anthropogenic influences on the water cycle in a Pleistocene landscape and associated geochemical reactions. The results allow the identification and description of the main hydraulic and geochemical processes that control water and solute fluxes in different hydrological compartments, in particular recharge and discharge regions. Under progressive climate change, this process-based knowledge should be used to adapt land and water management to minimise negative impacts on hydrological resources and stabilise the regional water balance in theBerlin-Brandenburg Pleistocene landscape. Based on these results, a risk assessment approach for validation of future management strategies under changing climate conditions is presented.
In Lower Lusatia, eastern Germany, the changing impacts of lignite coal mining and potential climate change have put the naturally low water yield conditions under pressure. Water resources balances describe the hydrological situation in the region and the need for action due to changing boundary conditions. Extended transfer of flood water from neighbouring catchments is considered inevitable for sustainable regional development and the establishment of a quantitatively and qualitatively selfregulated water system. Using the river basin management system WBalMo®, potential water transfer scenarios to compensate for water deficits resulting from regional and global change are analysed.
Numerous studies underline the importance of immaterial benefits provided by ecosystems and especially by cultural landscapes, which are shaped by intimate human–nature interactions. However, due to methodological challenges, cultural ecosystem services are rarely fully considered in ecosystem services assessments. This study performs a spatially explicit participatory mapping of the complete range of cultural ecosystem services and several disservices perceived by people living in a cultural landscape in Eastern Germany. The results stem from a combination of mapping exercises and structured interviews with 93 persons that were analyzed with statistical and GIS-based techniques. The results show that respondents relate diverse cultural services and multiple local-level sites to their individual well-being. Most importantly, aesthetic values, social relations and educational values were reported. Underlining the holistic nature of cultural ecosystem services, the results reveal bundles of services as well as particular patterns in the perception of these bundles for respondent groups with different socio-demographic backgrounds. Cultural services are not scattered randomly across a landscape, but rather follow specific patterns in terms of the intensity, richness and diversity of their provision. Resulting hotspots and coldspots of ecosystem services provision are related to landscape features and land cover forms. We conclude that, despite remaining methodological challenges, cultural services mapping assessments should be pushed ahead as indispensable elements in the management and protection of cultural landscapes. Spatially explicit information on cultural ecosystem services that incorporates the differentiated perceptions of local populations provides a rich basis for the development of sustainable land management strategies. These could realign the agendas of biodiversity conservation and cultural heritage preservation, thereby fostering multifunctionality.
Berlin Text System 3.1 User Manual : Editorial Software of the Thesaurus Linguae Aegyptiae Project
(2018)
The Berlin Text System (BTS) Version 3.1 manual introduces a Java-based software designed for editing and annotating Ancient Egyptian texts. BTS integrates a CouchDB database and an Elastic search engine to support its main components: Text Editor, Lemma List, Thesaurus, and Abstract Text.
The Text Editor facilitates transliteration, translation, lemmatization, and annotations, allowing for detailed lexical and grammatical analysis. Hieroglyphic transcriptions can be entered via a specialized Hieroglyph Type Writer based on JSesh.
The Lemma List ist ready to contain pre-Coptic lemmata, divided into Hieroglyphic/Hieratic and Demotic scripts, providing comprehensive entries with passport data, transliterations, and translations.
The Thesaurus allows for metadata enrichment of texts with controlled vocabulary for consistent data management, supporting contextual analysis through structured metadata.
The manual covers BTS's user interface, including menu bar, toolbar, status bar, and workspace, divided into views for each main component. Features like Revision History for tracking and restoring versions, indexing, and search capabilities enhance user efficiency. BTS is a powerful tool for the study and preservation of Ancient Egyptian texts, integrating advanced database and search technologies with specialized textual analysis tools.
Physical principles underlying biological pattern formation are discussed. In particular, the combination of local self-enhancement and long-range (“lateral”) inhibition (Gierer and Meinhardt, 1972) accounts for de-novo pattern formation, and for striking features of developmental regulation such as induction, spacing and proportion regulation of centers of activation in tissues and cells. Part I explains physical principles of spatial organisation in biological development. Part II demonstrates in mathematical terms that and how short-range activation and long-range inhibition are conditions for the generation of spatial concentration patterns. The conditions can be expressed in terms of ranges, rates and orders of reactions. These conditions, in turn, can also be derived by analysis of dynamic instabilities by means of Fourier waves, showing the neither obvious nor trivial relation between the latter approach and the theory based primarily on autocatalysis and lateral inhibition.
Modern brain research related to consciousness has resulted in many interesting in- sights, for example into the neurobiological basis of attention and of language. In biological terms, human consciousness appears as a system’s feature of our brain, with neural processes strictly following the laws of physics. This does not necessarily imply, however, that there can be a general and comprehensive scientific theory of consciousness. Predictions of the extent to which such a theory may become possi- ble vary widely in the scientific community. There are reasons - not only practical but also epistemological - why the brain-mind relation may not be fully decodable by finite procedures. In particular, analogies with mathematical theorems of un- decidability suggest that self-referential features of consciousness, such as multiple self-representations like those involved in strategic thought, may not be fully resolv- able by brain analysis. Assuming such limitations exist, this implies that ob jective analysis cannot exhaust sub jective experience in principle. A person’s consciousness and will are accessible to external observation only within limits. In some respects, we do not even learn to know ourselves except by our actions. It thus appears that a scientific look at consciousness and the human mind, combining universal physi- calism with epistemological scepticism, is not inconsistent with certain concepts of sub jectivity that are current in the humanities, despite all the differences in the style and terminology of discourse.
Virtually all conventional text-based natural language processing techniques - from traditional information retrieval systems to full-fledged parsers - require reference to a fixed lexicon accessed by surface form, typically trained from or constructed for synchronic input text adhering strictly to contemporary orthographic conventions. Unconventional input such as historical text which violates these conventions therefore presents difficulties for any such system due to lexical variants present in the input but missing from the application lexicon. To facilitate the extension of synchronically-oriented natural language processing techniques to historical text while minimizing the need for specialized lexical resources, one may first attempt an automatic canonicalization of the input text. This paper provides an informal overview of the various canonicalization techniques currently employed by the Deutsches Textarchiv project at the Berlin-Brandenburg Academy of Sciences and Humanities to prepare a corpus of historical German text for part-of-speech tagging, lemmatization, and integration into a robust online information retrieval system.
The potential of agriculture, forestry, and other land uses to sequester carbon offers a powerful tool for controlling the global climate regime, but practices capable of creating “collateral” benefits for landscape conservation have thus far been disregarded. This paper calls for greater integration of scattered trees into agricultural landscapes, hypothesizing that agroforestry practices effectively store carbon and deliver other important ecosystem services as well. Several agroforests from the Upper Lusatia area in Eastern Germany have been selected for analysis. They cover relatively large areas of land (8.2%), even within this intensively used agricultural landscape, and their extent increased from 1964-2008 by 19.4%. Practices of conserving or promoting the six agroforest classes are compared with a catalogue of essential properties for becoming effective “carbon offset projects”. Criteria from mandatory and voluntary carbon markets for carbon sequestration are then applied (additionality, baselines, permanence, and carbon leakage). The study concludes that steps towards realization of “carbon sequestration projects” should include collecting empirical evidence regarding the carbon sequestration potential of temperate agroforestry systems, developing localised demonstration projects, and upscaling these projects to participate in established carbon markets.
Dealing with the Consequences of Climate Change in Historic Parks and Gardens in the United Kingdom
(2019)
Given that long term climate change is recognised as having an ›impact upon all aspects of daily life, not least the survival of heritage assets‹ there is a need to consider all aspects of heritage in the United Kingdom (UK). In order to provide an international context for the German situation this paper looks specifically at adaptation measures that have developed within the main British conservation and horticultural organisations, Historic England, the National Trust and the Royal Horticultural Society. It does this by providing some cultural context for the present policies. It then looks at how the climate is expected to change by the end of this century. It identifies the main challenges, and then reviews the responses by way of adaptation and mitigation.
Aside from the increasing, impressive evidence on chemical identification of graded molecules involved, it is the capability of axons for approaching the target position from different aspects in a two-dimensional field which is per se a strong indication for the involvement of gradients. Targeting requires, in the target field, counter-graded effects, either by antagonistic gradients, or by a single gradient in each dimension exerting attractive effects at low, reverting to inhibitory (repulsive) effects at high concentrations. A further requirement for mapping is the modulation of the counter-graded effects by components of the growth cone itself which depends on the origin of the corresponding axon.Transduction and processing of graded signals in the navigating growth cones are proposed to be strongly enhanced by intra-growth-cone pattern formation. The concept also encompasses regulatory and branching processes including the formation of the terminal arbors.
Early-career funding in German-African academic cooperation: achievements, challenges, perspectives
(2024)
This paper analyses experiences, challenges and potentials in German-African academic cooperation in the field of early-career funding considering the humanities and social sciences as well as natural sciences and medicine. It is based on a comprehensive overview of existing German funding formats and an exemplary survey of the experiences of African cooperation partners with these programmes. The authors propose the establishment of an interface between academic research, the practice of science funding, and African researchers. According to the authors, such a contact and information point would contribute to the improvement of German-African science cooperation and be an important element of Germany’s scientific diplomacy in the long term. This paper is the English translation of Denkanstoß 13 (2023): Early-Career-Förderung in der deutsch-afrikanischen Wissenschaftskooperation. Leistungen, Herausforderungen, Perspektiven. Berlin.
Ediarum is an editing environment designed and implemented by TELOTA at the Berlin-Brandenburg Academy of Sciences and Humanities (BBAW, Germany). It is based on two main components: an open-source XML native database (eXistDB) and a widely used commercial XML editor (Oxygen XML editor).
The aim of ediarum is to facilitate the task of encoding texts in TEI format, to store the resulting XML files in eXistDB and to enable collaboration and sharing amongst the members of a team. The central framework of this environment --known as ediarum.BASE.edit-- allows the editor to hide the XML tags and use a number of functions through a toolbar and a menu. In other words, the ediarum.BASE.edit's interface increases the usability of the XML editor and speeds up the encoding process and can be adapted to each project's needs. However, this framework is only available in German language. In other words, the code and the language interface are only accessible for and usable by German-speaking users.
While the original goal of TELOTA was to “bridge the gap” between the markup and the editor (Dumont and Fechner, 2015), the interface language creates a barrier for encoders who do not work in German and impedes potential collaborations with other institutions. In order to break this usability and accessibility barrier, in 2020 Proyecto Humboldt Digital (ProHD), a cooperation project between the BBAW and the Oficina del Historiador de la Ciudad de la Habana (Cuba), engaged with an adaptation process involving the internationalization of the software (developing features and code that are independent of language or locale) and the localization in the Spanish locale (creating resource files containing translations). As a result of this process, the project has developed a localization of ediarum.BASE.edit called ediarum.PROHD.edit that can be downloaded on Github.
This paper aims to present ediarum.PROHD.edit and to reflect on the most important challenges encountered during the software localization. After reviewing what “localization” means in Translation Studies (Pym, 2016; Jiménez Crespo, 2016), I will discuss the process of internationalization of the software (mostly variables written in ediarum's default functions), the localization itself (the translation of terms and descriptions displayed in the interface) and some testing undertaken with the Cuban team of Proyecto Humboldt Digital.
Emergence, analysis and optimization of structures - Concepts and strategies across disciplines
(2007)
The study of structures is a common concern of all scientific disciplines. The motivation as well as the methods of analysis, however, differ considerably. In engineering, the generation of artifacts, of infrastructures or technological processes are of primary interest. Frequently, the analysis aims at an optimization of the structures and the structure generating processes. Quite different is the study and explanation of existing structures in biology and the social sciences. Here the question of optimality does not present itself in an unambiguous manner. Generally, it must be questioned whether biological and social structures, although developing in an evolutionary way, can be considered as leading towards an a-priori defineable goal of optimality. The complex scenario of qualitative and quantitative modeling, and the goal-oriented and statistical approaches to understanding the meliorisation efforts in the various fields of the sciences and humanities define the scope of this book. Its intention is to create trans-disciplinary insights into methods to fecundate the custom disciplinary approaches.
Ancient Greek philosophers were the first to postulate the possibility of explaining nature in theoretical terms and to initiate attempts at this. With the rise of monotheistic religions of revelation claiming supremacy over human reason and envisaging a new world to come, studies of the natural order of the transient world were widely considered undesirable. Later, in the Middle Ages, the desire for human understanding of nature in terms of reason was revived. This article is concerned with the fundamental reversal of attitudes, from “undesirable” to “desirable”, that eventually led into the foundations of modern science. One of the earliest, most ingenious and most interesting personalities involved was Eriugena, a theologian at the Court of Charles the Bald in the 9th century. Though understanding what we call nature is only one of the several aspects of his theological work, his line of thought implies a turn into a pro-scientific direction: the natural order is to be understood in abstract terms of ‘primordial causes’; understanding nature is considered to be the will of God; man encompasses the whole of creation in a physical as well as a mental sense. Basically similar ideas on the reconciliation of scientific rationality and monotheistic religions of revelation were conceived, independently and nearly simultaneously, by the Arab philosopher al-Kindi in Bagdad. Eriugena was more outspoken in his claim that reason is superior to authority. This claim is implicit in the thought of Nicholas of Cusa with his emphasis on human mental creativity as the image of God’s creativity; and it is the keynote of Galileo’s ‘Letter to the Grand Duchess Christina’ some 800 years later, the manifesto expressing basic attitudes of modern science. This article in English is based on the monography (in German): A. Gierer “Eriugena, al-Kindi, Nikolaus von Kues - Protagonisten einer wissenschaftsfreundlichen Wende im philosophischen und theologischen Denken”, Acta Historica Leopoldina 29 (1999), Barth Verlag in MVH Verlage Heidelberg, ISBN: 3-335-00652-6
Even a reductionist attempt to define scholarship is clearly fraught with difficulty, but an idealised historical lexicographer-cum-scholar must obviously have – inter alia and at the very least – a profound linguistic and textual knowledge of the language being documented, an ability to understand texts in their historical context and to analyse the meaning or function of lexical items as used in context, an ability to synthesise the results through generalisation and abstraction and to formulate them in a way that is both accurate, i.e. reflects actual usage, and user- or reader-friendly, i.e. is comprehensible to the user/reader. S/he must have encyclopedic or world knowledge and literary skills in order to understand general content words and explain their meaning and their semantic shifts perhaps over many centuries, and technical expertise to understand specialist terms and define their use in specific contexts, again perhaps over time. In respect of etymology s/he must not only have knowledge of older stages of the language and an ability to reconstruct unattested forms, but also knowledge of the other languages that have impacted on the language being documented, or at least familiarity with the scholarly historical dictionaries of those languages. That is a tall order indeed, impossibly tall for any one person today given today‘s demands on and expectations of lexicographers. Teams which include specialists in different areas or at least have access to consultants in such areas alongside generalists are needed if scholarly standards are to be met. The standard of scholarship is primarily a factor of the number and range as well as the knowledge and experience of the lexicographers, as is in large measure the pace of production. In this regard, it cannot be emphasised enough that scholarly historical lexicography of high quality is and will remain very time consuming.
Even a reductionist attempt to define scholarship is clearly fraught with difficulty, but an idealised historical lexicographer-cum-scholar must obviously have – inter alia and at the very least – a profound linguistic and textual knowledge of the language being documented, an ability to understand texts in their historical context and to analyse the meaning or function of lexical items as used in context, an ability to synthesise the results through generalisation and abstraction and to formulate them in a way that is both accurate, i.e. reflects actual usage, and user- or reader-friendly, i.e. is comprehensible to the user/reader. S/he must have encyclopedic or world knowledge and literary skills in order to understand general content words and explain their meaning and their semantic shifts perhaps over many centuries, and technical expertise to understand specialist terms and define their use in specific contexts, again perhaps over time. In respect of etymology s/he must not only have knowledge of older stages of the language and an ability to reconstruct unattested forms, but also knowledge of the other languages that have impacted on the language being documented, or at least familiarity with the scholarly historical dictionaries of those languages. That is a tall order indeed, impossibly tall for any one person today given today‘s demands on and expectations of lexicographers. Teams which include specialists in different areas or at least have access to consultants in such areas alongside generalists are needed if scholarly standards are to be met. The standard of scholarship is primarily a factor of the number and range as well as the knowledge and experience of the lexicographers, as is in large measure the pace of production. In this regard, it cannot be emphasised enough that scholarly historical lexicography of high quality is and will remain very time consuming.
In 20 articles experts from research, politics and research management discuss current challenges and future advancements of European research infrastructures for the humanities and social sciences, particularly in view of the funding scheme Horizon 2020 and the ESRFI Roadmap update. Starting with an overview of SSH infrastructures it elaborates on four specific areas that increasingly demand a pan-European approach. Drawing from the SSH infrastructure projects´ experience, it then (re-) defines the requirements and potential for next generation infrastructure projects. They highlight the developments and problems they anticipate, focussing in particular on advancing digitalisation in the SSH. The book draws together the insights gained at a conference of the same name, “Facing the Future”, held in Berlin in November 2013. The conference was attended by 70 experts from 19 European countries who met to discuss the new challenges posed by the increasing necessity of integrating digital research tools into everyday working life. It was organised by the European Strategy Forum on Research Infrastructures (ESFRI), the federation of All European Academies (ALLEA), the Union of the German Academies of Sciences and Humanities, and the German Data Forum. It took place as part of a project financed by the German Federal Ministry of Education and Research (BMBF) entitled Survey and Analysis of Basic Research in the Social Sciences and Humanities in Europe (SASSH).
We expose analogies between turbulence in a fluid heated from below (Rayleigh-Bénard (RB) flow) and shear flows: The unifying theory for RB flow (S.Grossmann and D.Lohse, J.Fluid Mech. 407, 27-56 (2000) and subsequent refinements) can be extended to the flow between rotating cylinders (Taylor-Couette flow) and pipe flow. We identify wind dissipation rates and momentum fluxes that are analogous to the dissipation rate and heat flux in RB flow. The proposed unifying description for the three cases is consistent with the experimental data.
For a fistful of blogs: Discovery and comparative benchmarking of republishable German content
(2014)
We introduce two corpora gathered on the web and related to computer-mediated communication: blog posts and blog comments. In order to build such corpora, we addressed following issues: website discovery and crawling, content extraction constraints, and text quality assessment. The blogs were manually classified as to their license and content type. Our results show that it is possible to find blogs in German under Creative Commons license, and that it is possible to perform text extraction and linguistic annotation efficiently enough to allow for a comparison with more traditional text types such as newspaper corpora and subtitles. The comparison gives insights on distributional properties of the processed web texts on token and type level. For example, quantitative analysis reveals that blog posts are close to written language, while comments are slightly closer to spoken language.
Stephen Jay Gould wrote recently that “when Church began to paint his great canvases, Alexander von Humboldt may well have been the world’s most famous and influential intellectual.” Humboldt’s influence in the case of the landscape artist Church is especially interesting. If we examine the precise relationship between the German explorer and his American admirer, we gain an insight into how Humboldt transformed Church’s life and signaled a new phase in the career of the artist. Church retraced Humboldt’s travels in Ecuador and in Mexico. If we compare the texts available to Church and the comparison of Church’s paintings and the texts and images of Humboldt’s works we can arrive at new perspectives on Humboldt’s extraordinary influence on American landscape painting in the nineteenth century.
From exclusion to inclusion : improving clinical research in vulnerable populations ; memorandum
(2014)
Therapeutic care for vulnerable populations – meaning patient groups such as underage children and the mentally ill that have limited or no capacity for giving informed consent – is severely lacking. Thus, for example, a great portion of pharmaceuticals used in the treatment of children and youth have not been specifically designed for these groups, which often results in side effects that are disproportionate to those associated with such medicines when used by adults. Moreover, vulnerable populations are at times faced with having no therapies at all for some of their ailments, such that children and dementia sufferers, for example, are often considered to be “therapeutic orphans”. It is therefore urgent that clinical research be carried out among vulnerable populations in order to improve their therapeutic possibilities. The Clinical Research on Vulnerable Populations Research Group – a cooperative effort between the Berlin-Brandenburg Academy of Sciences and Humanities (Berlin, Germany) and the European Academy of Technology Assessment (Bad Neuenahr, Germany) – has set itself the task of analyzing the state of clinical research on vulnerable populations so as to be able to develop suggestions for improving future research of this kind. The results of this work are presented in the following memorandum, which seeks to portray the state-of-the-art in this domain while also assessing the strengths and weaknesses of contemporary ethical and medical perspectives related to it. The memorandum is primarily oriented towards those in the relevant scientific disciplines who can benefit from obtaining an informed consensus regarding the current state of the discussions taking place around this topic.
Applying mild methods of preparation, part of the ribosomes of rabbit reticulocytes are found in aggregates (later called polyribosomes) of up to six ribosomal units. Upon treatment with RNA-ase, they desintegrate into single ribosomes. The fast-sedimenting aggregates are found to be more active in protein synthesis in terms of incorporation of radioactive amino acids, whereas the single ribosomes are more receptive to stimulation by the artificial messenger RNA poly-U. The findings indicate that the linkage of ribosomes into aggregates is due to the messenger RNA. They support a tape-reading mechanism of protein synthesis whereby growth of the peptide chain is accompanied by shifting the active site of the ribosome from one coding group of nucleotides of the messenger RNA to the next.
Global climate change and aspects of regional climate change in the Berlin-Brandenburg region
(2011)
To obtain an estimate of the average temperature of the northern hemisphere during the last 1200 years, proxy data have been merged with instrumental recordings. These instrumental measurements are, with a few exceptions, only available for the recent 150 years. In the city of Berlin the temperature has been recorded since as early as 1701. However, during the first 150 years the measurements were problematic as location, measurement procedure and instruments changed frequently and without proper documentation. From 1847 onwards observations became more reliable once the Royal Prussian Meteorological Institute had been established. For the last 100 years temperature and precipitation measurements have been performed in parallel at Berlin-Dahlem and Potsdam. The datasets recorded in the city of Berlin and in Berlin-Dahlem have been merged to obtain a record of more than 300 years. It indicates that the temperature of Berlin has risen by 1.04°C during the last 100 years after correcting for the urbanisation effect. In the same period, the total number of frost days has significantly decreased by almost 17 days, and the number of summer days has significantly increased by about 12 days. Annual mean precipitation has hardly changed (decrease less than 0.2 %) during the last century. However, rainfall has decreased by about 4 % in summer and increased by 3 % in winter. All precipitation changes are below the 95 % ignificance level. Model projections indicate that warming will continue which means that Berlin-Brandenburg will experience a temperature rise of about 3-3.5°C by the end of this century for the IPCC scenario A1B. For the same scenario precipitation is expected to increase by 10-20 % in winter and to decrease by 10-30 % in summer: The seasonal precipitation changes compensate each other resulting in an almost unchanged annual mean.
An der Sprache des Rechts wird Kritik geübt, seit die Aufklärung die Verständlichkeit der Gesetze zu ihrem Anliegen gemacht hat. Mit den großen Kodifikationen des Rechts im ausgehenden 19. Jahrhundert hat die Kritik am angeblich schlechten, unverständlichen Juristendeutsch eine besondere demokratietheoretische Legitimation bekommen. Diese Sprachkritik sucht seit den siebziger Jahren vermehrt bei der Linguistik Rat, wie denn eine bessere Allgemeinverständlichkeit von Rechtstexten verwirklicht werden könnte. Der Band versammelt systematisch aufeinander bezogene Beiträge ausgewiesener Linguisten, Juristen und Schriftsteller zur Problematik des Verständnisses juristischer Sprache, zur Methodik empirischer Verständlichkeitsmessung und zu den Möglichkeiten transdisziplinärer Kooperation zwischen Rechts- und Sprachwissenschaftlern.
Modern science, based on the laws of physics, claims validity for all events in space and time. However, it also reveals its own limitations, such as the indeterminacy of quantum physics, the limits of decidability, and, presumably, limits of decodability of the mind-brain relationship. At the philosophical level, these intrinsic limitations allow for different interpretations of the relation between human cognition and the natural order. In particular, modern science may be logically consistent with religious as well as agnostic views of humans and the universe. These points are exemplified through the transcript of a discussion between Kurt Gödel and Rudolf Carnap that took place in 1940. Gödel, discoverer of mathematical undecidability, took a proreligious view; Carnap, one of the founders of analytical philosophy, an antireligious view. By the time of the discussion, Carnap had liberalized his ideas on theoretical concepts of science: he believed that observational terms do not suffice for an exhaustive definition of theoretical concepts. Then, responded Gödel, one should formulate a theory or metatheory that is consistent with scientific rationality, yet also encompasses theology. Carnap considered such theories unproductive. The controversy remained unresolved, but its emphasis shifted from rationality to wisdom, not only in the Gödel-Carnap discussion but also in our time.
Since humans are preferentially settling in flood plains they often influence freshwater systems intensely. The first signs of anthropogenic impacts on surface waters in the Berlin-Brandenburg region are approximately 3000 years old. Considering the multiple and intense human uses of surface waters in this region, we analysed when, how and to which extent regional rivers and streams became impacted by dams, water mills and fish weirs resulting in changes in morphology, hydrology and ecological functioning. We hypothesise that the development and growth of cities in this region necessitated (1) efficient navigability of rivers linking them, (2) efficient use of hydropower resources for mills, and (3) significant pollution of surface waters especially with the beginning of industrial development. We analyse these hypotheses by means of three regional examples and delineate the effects of human uses on selected surface water bodies. Understanding the effects of these historic modifications of surface water supports the identification of options for a sustainable use of surface waters that are currently still subjected to multiple uses but face a significant decrease in discharge due to climate change.
The FEW is a huge dictionary when we consider the sheer mass of data (25 volumes, 16000 pages) and its exhaustive aims. It has indeed the purpose of registering and etymologizing the whole lexicon, not only of French, but also of earlier stages of the language and of Occitan; of every Gallo-romance dialect; of every technical or professional genre; of every language register, including slang. Summing up, the FEW aims to include and describe every single lexical unit which exists or has existed in the territory of ancient Gaul. The sheer size of this undertaking means two things, which directly influence the digitalisation of the dictionary: Firstly, there is a a huge amount of data; secondly, the presentation and organization of the data is exceedingly complex. The reasons for digitalising the FEW are the easy searches for units, and the carrying out of searches using criteria that are not possible to use with the printed version. However, the fulfillment of these purposes includes some risks, and potentially the cutting of some corners, especially the temptation of renouncing reading.
Biological evolution and technological innovation, while differing in many respects, also share common features. In particular, the implementation of a new technology in the market is analogous to the spreading of a new genetic trait in a population. Technological innovation may occur either through the accumulation of quantitative changes, as in the development of the ocean clipper, or it may be initiated by a new combination of features or subsystems, as in the case of steamships. Other examples of the latter type are electric networks that combine the generation, distribution, and use of electricity, and containerized transportation that combines standardized containers, logistics, and ships. Biological evolution proceeds, phenotypically, in many small steps, but at the genetic level novel features may arise not only through the accumulation of many small, common mutational changes, but also when distinct, relatively rare genetic changes are followed by many further mutations. New evolutionary directions may be initiated by, in particular, some rare combinations of regulatory sections within the genome. The combinatorial type of mechanism may not be a logical prerequisite for biological innovation, but it can be efficient, especially when novel features arise out of already highly developed systems. Such is the case with the evolution of general, widely applicable capabilities of the human brain. Hypothetical examples include the evolution of strategic thought, which encompasses multiple self-representations, cognition-based empathy, meta-levels of abstraction, and symbolic language. These capabilities of biologically modern man may have been initiated, perhaps some 150 000 years ago, by one or few accidental but distinct combinations of modules and subroutines of gene regulation which are involved in the generation of the neural network in the cerebral cortex. This hypothesis concurs with current insights into the molecular biology of the combinatorial and hierarchical facets of gene regulation that underlie brain development. A theory of innovation encompassing technological as well as biological development cannot per se dictate alternative explanations of biological evolution, but it may help in adding weight and directing attention to notions outside the mainstream, such as the hypothesis that few distinct genetic changes were crucial for the evolution of modern man.
New, precise genetic engineering methods for genome alteration in living cells, which can be classed together under the generic heading “genome surgery”,are currently sparking a revolution in biomedical research. The Interdisciplinary Research Group Gene Technology Report is, in principle, in favour of research on these promising new methods for the medical sector. However, for the time being, it has clearly spoken out against gene surgery experiments on the human germ line, which could also enter the realm of possibility thanks to these methods.The research group, therefore, supports the call, which has already been discussed at length in scientific and public circles, for a moratorium for germ line experiments. The period of the moratorium should be used to debate the experimental,
ethical and legal aspects of germ line therapy in an open, transparent
and critical manner with a view to more clearly defining the opportunities and
risks of these technologies for man and nature, and to elaborating recommendations for future regulations. The goal of this analysis is to promote a discourse of this kind.
This is the invited evening lecture of the biannual workshop on hydroid development of 1999. Its topic is the role of hydra as a rather puristic model for the de-novo generation of spatial patterns in development, and our work in this field. Emphasis is placed not only on experimental studies, but also on theoretical analysis, because the understanding of spatial order requires a systems approach involving the combination of knowledge on molecules, cells and tissues with mathematical analysis, laws and facts.
Understanding cooperative human behaviour depends on insights into the biological basis of human altruism, as well as into socio-cultural development. In terms of evolutionary theory, kinship and reciprocity are well established as underlying cooperativeness. Reasons will be given suggesting an additional source, the capability of a cognition-based empathy that may have evolved as a by-product of strategic thought. An assessment of the range, the intrinsic limitations, and the conditions for activation of human cooperativeness would profit from a systems approach combining biological and socio-cultural aspects. However, this is not yet the prevailing attitude among contemporary social and biological scientists who often hold prejudiced views of each other's notions. It is therefore worth noticing that the desirable integration of aspects has already been attempted, in remarkable and encouraging ways, in the history of thought on human nature. I will exemplify this with the ideas of the fourteenth century Arab-Muslim historian Ibn Khaldun. He set out to explicate human cooperativeness - "asabiyah" - as having a biological basis in common descent, but being extendable far beyond within social systems, though in a relatively unstable and attenuated fashion. He combined psychological and material factors in a dynamical theory of the rise and decline of political rulership, and related general social phenomena to basic features of human behaviour influenced by kinship, expectation of reciprocity, and empathic emotions.
Upon separation of the protein from the nucleic acid component of tobacco mosaic virus by phenol, using a fast and gentle procedure, the nucleic acid is infective in assays on tobacco leaves. A series of qualitative and quantitative control experiments demonstrates that the biological activity cannot depend on residual proteins in the preparation, but is a property of isolated nucleic acid which is thus the genetic material of the virus.
In the last decade, interaction between scholarly lexicography and the public has grown enormously. While in the old days, the lexicographer and in particular, the scholarly lexicographer, had a tendency to describe the lexicon from an ivory tower, in a way that was for the general public rather unaccessible, a change has been evident for some time now. Interaction with the general public is now more and more appreciated and is even being stimulated within the lexicographic community. This holds too for the Algemeen Nederlands Woordenboek (ANW), a project of the Institute for Dutch Lexicology in Leiden. The ANW is an online scholarly dictionary of contemporary Dutch. In its periodization it is the successor of the Woordenboek der Nederlandsche Taal (WNT), which was completed in 2001 and covers the vocabulary of the Netherlands and Flanders up to around 1976. The editorial staff of the ANW would like to create a dictionary that is suitable for different audiences, ranging from language professionals and other academics to pupils, students and language enthusiasts in general. Consequently, interaction with the public is very important to the ANW editorial staff. It is realised in various ways. First, each dictionary article offers users the option to give feedback. Second, the editorial staff uses questions and comments gathered on internet forums, such as Meldpunt Taal (launched in June 2010) and Neo-term. The ANW staff also approaches the public directly through Twitter, with items such as ‘neologism of the week’, facts about spelling and answers to questions about language that have been received. A relatively new initiative is to call upon the public in the search for information for the dictionary, such as synonyms, pictures and the earliest use of words. Language games and word polls are other ways to increase the interest and involvement of the general public in the ANW.
The African European Mediterranean Academies for Science Education (AEMASE) initiative is committed to promoting science outreach to society and to improving the quality and accessibility of science education in schools throughout the eponymous North-South region. To achieve these aims, one of AEMASE’s key activities is implementing IBSE in more schools and supporting the continued professional development of science educators in IBSE methodology and practice. In the long term, the AEMASE partner institutions, which come from all three geographical areas, seek to contribute to the steady development of quality science and innovation systems by focussing on stimulating and supporting the future generations of researchers and innovators. In this context, key AEMASE partner institutions held an international conference on science education in Rome in May 2014, hosted by the venerable Accademia Nazionale dei Lincei. Participants from six continents shared their professional experiences with IBSE and discussed best practices, challenges and future collaboration opportunities. The conference brought together representatives from three crucial areas of expertise: science, education, and policy. The outcomes of this conference are condensed in the report which serves as a testament to the relevance and importance of quality science education for modern societies.
Introduction
(2019)
Introduction : how much is enough, but not too much ; (Ernst-Mayr-Lecture am 27. Oktober 1998)
(1999)
Introduction : The Grants, Dreaming Darwin's Dream ; (Ernst Mayr Lecture am 4. November 2004)
(2006)
Most industrial countries have experienced a transformation of land use: from decreasing to expanding forest areas, the so-called forest transition. Outside closed forests, European rural landscapes exhibit a diversity of tree-based agricultural systems, but the question of whether this forest transition has also affected ‘trees outside forests’ has rarely been studied. The aim of this study is to analyze the spatial-temporal dynamics of farm trees and woodlands in an agricultural landscape in Eastern Germany from 1964 to 2008, based on aerial photographs and digital orthophotos. Taking a landscape ecological perspective, we quantify farm tree dynamics, disentangle processes of gain and loss in the socialist and post-socialist periods of Eastern Germany, and assess differences in ecosystem services provided by farm trees. A substantial increase of overall tree cover by 24.8% was observed for the selected time period, but trajectories have been disparate across different farm tree classes. The increase in tree cover was stronger in steep valleys than on hills and plateaus, indicating a significant interdependence between topography and trajectories of change. Patch numbers of farm trees did not increase, which suggests that the expansion of tree cover is mostly due to a spatial expansion of previously existing tree patches. Overall net gains in tree cover were rather similar during the socialist and post-socialist eras. The general increase in tree cover was accompanied by increases in agriculture-related ecosystem service provision, but the increase in pollination and pest control services was much lower than that in water purification services. These findings present the first empirical evidence from an industrialized country that there is also an ongoing ‘forest transition’ outside closed forests. Potential, partially counteracting drivers of change during the socialist and post-socialist periods have mainly been related to farm policies and the environmental consciousness of land users and society as a whole.
Eastern Mediterranean silvopastoral oak woodlands have been greatly damaged through forest conversion, illegal lumbering, overgrazing, and forest fires. The aim of this study was to assess land-use changes and the legacies that they have imprinted on the forest structure of Quercus macrolepis and accompanying Quercus pubescens and Quercus cerris woodlands on Lesvos Island, Greece. The size-structures of adult oak populations were analyzed as indicators of long-term oak regeneration, while short-term recruitment was determined by counting oak seedlings and saplings. The size-structure of the adult Q. macrolepis population was similar to the inverse J-shaped distribution typical for natural Mediterranean oak forests, indicating continuous recruitment with a constant mortality rate of mature individuals. Seedling and sapling densities were highly variable, but generally low in relation to adult oak densities. Recruitment of oak seedlings and saplings was positively related to determinants such as forest cover, adult oak density and basal area, woody plant richness, and litter cover. Both seedling and sapling occurrence was negatively associated with dung frequency, which suggests that sheep grazing imposes a barrier to oak recruitment. The study outlines a comprehensive land-use transition from the 1950s to the 1970s, during which a complex and multifunctional agrosilvopastoral land-use system was simplified to an intensive grazing system. The discrepancy between the successful long-term regeneration and the less successful short-term recruitment of oaks illustrates that intensified livestock grazing has been a major driver of vegetation change. Grazing impact is likely to interact with increasing drought conditions, which may trigger a negative feedback cycle that undermines the capacity of woodlands to sustain ecosystem services.
Agroecosystems are vital for supplying ecosystem services to human society, but most modern farming practices impact detrimentally on the environment. Public agricultural support policies have been critically important in influencing the transformation of the farm sectors; however, few of them have been dedicated to enhancing ecosystem services beyond agricultural commodities. The largest agricultural support system worldwide, the European Common Agricultural Policy (CAP), has now come to a critical point, as major decisions concerning its design and implementation after 2013 are about to be taken. The debate on this reform process presents a unique opportunity to trigger a transition from commodity-based subsidy policies to policies centered on efficient provision of ecosystem services from agricultural land. To prompt such discussion, we formulate key recommendations informed by a review of ecosystem services literature and address verifiable links to human well-being, non-market valuation for balanced services provision, treatment of ecosystem services bundles, site-specific and regionalized approaches, matching spatial scales for different ecosystem services, funding permanence for payment schemes, strong monitoring and adaptive approaches to tackling uncertainties, and coherent cross-sectoral policy design. If these issues were to be considered in formulating and implementing future CAP, it might become an exemplar for redirecting agricultural policies elsewhere in the world towards sustainability.
Numerous high-quality primary text sources—in the context of the curation project described here, this means full-text transcriptions (and corresponding image scans) of German works originating from the 15th to the 19th centuries—are scattered among the web or stored remotely. E.g., transcriptions of historical sources are stored locally on degrading recording media and cannot be found, let alone accessed by third parties. Additionally, idiosyncratic, project-specific markup conventions and uncommon, out-of-date or inflexible storage formats often hinder further usage and analysis of the data. Often, textual resources are accompanied by scarce, insufficient or inaccurate bibliographic information, which is only one further reason why valuable resources, even if available on the web, remain undiscovered by and are of little use to the wider research community. The integration of these dispersed primary text sources into the sustainable, web and centres-based research infrastructure of CLARIN-D will be an important step to solve this problem. The Full Paper illustrates an exemplary approach taken by the »Deutsches Textarchiv« (DTA; www.deutschestextarchiv.de) at the Berlin-Brandenburg Academy of Sciences and Humanities (BBAW) to integrate dispersed textual resources and corresponding image scans from various sources into a large historical text corpus of its own and to insert these into the infrastructure of CLARIN-D.
Global change is posing a major challenge to existing forms of natural resource use, socio-economic development and institutional regulation. Although trends such as climate change, socio-economic transformation and institutional change are global in their scope, they have very specific regional outcomes. Regionally distinct coping strategies are required which take into account both the diversity of regional impacts of global change and the local contexts of appropriate responses. This paper explores the impacts of global change on the management of water infrastructure systems in the Berlin-Brandenburg region in terms of three concurrent and overlapping challenges: climate change, socio-economic change and institutional change. It subsequently examines how regional actors in the water sector are addressing these three dimensions of global change.
Among mass digitization methods, double-keying is considered to be the one with the lowest error rate. This method requires two independent transcriptions of a text by two different operators. It is particularly well suited to historical texts, which often exhibit deficiencies like poor master copies or other difficulties such as spelling variation or complex text structures. Providers of data entry services using the double-keying method generally advertise very high accuracy rates (around 99.95% to 99.98%). These advertised percentages are generally estimated on the basis of small samples, and little if anything is said about either the actual amount of text or the text genres which have been proofread, about error types, proofreaders, etc. In order to obtain significant data on this problem it is necessary to analyze a large amount of text representing a balanced sample of different text types, to distinguish the structural XML/TEI level from the typographical level, and to differentiate between various types of errors which may originate from different sources and may not be equally severe. This paper presents an extensive and complex approach to the analysis and correction of double-keying errors which has been applied by the DFG-funded project “Deutsches Textarchiv” (German Text Archive, hereafter DTA) in order to evaluate and preferably to increase the transcription and annotation accuracy of double-keyed DTA texts. Statistical analyses of the results gained from proofreading a large quantity of text are presented, which verify the common accuracy rates for the double-keying method.
Mind, Matter and Mathematics
(2008)
The short paper introduces the concept of possible branches of double-stranded DNA (later sometimes called palindromes): Certain sequences of nucleotides may be followed, after a short unpaired stretch, by a complementary sequence in reversed order, such that each DNA strand can fold back on itself, and the DNA assumes a cruciform or tree-like structure. This is postulated to interact with regulatory proteins.
This study explores the potential of historical maps to detect, measure and monitor changes of trees outside forests. The main goal is to assess local-level changes of scattered trees and orchards and their land-use determinants in two areas in Southern Germany between 1901/1905 and 2009. Firstly, overall landscape changes are recorded. Secondly, the spatial-temporal trajectories of scattered trees and their land-use determinants are identified. Thirdly, changes in quantity and fragmentation patterns of traditional orchards are analyzed in their relationship to overall land-cover change. The results confirm major losses in scattered trees, mainly due to urbanization, agricultural intensification, and land abandonment. They further reveal that, while orchards have persisted in total area, they have undergone critical changes towards a simplified landscape structure and loss of the traditional land-use mosaic, which is a characterizing feature of high nature value landscapes. Multi-temporal assessment showed that most trends have been continuous and did not change directions over time, but rather accelerated during periods of rapid change (most dramatically in the 1950-1990 period). The case of orchards and scattered trees illustrates a major problem of cultural landscapes in Europe: Semi-natural landscape features of high nature value are threatened by both intensification and abandonment of land uses. This makes their conservation a potentially costly enterprise, as both opportunity costs for lost alternative land uses and for conservation management costs arise.
The principal objective of this article is to reflect (in a philosophical manner) on recent developments in moral legislation in The Netherlands. The term ›moral legislation‹ refers to all forms of legislation on issues which can be regarded as ›moral‹ – such as euthanasia and animal experimentation. The reason for focussing on The Netherlands is that, on an international level, it is a country which has gained a reputation for being ›liberal‹, and is therefore admired by some and held in abhorrence by others.
Non-Oberbeck-Boussinesq (NOB) effects on the Nusselt number Nu and Reynolds number Re in strongly turbulent Rayleigh-Benard convection in liquids were investigated both experimentally and theoretically. In the experiment, the heat current, the temperature difference, and the temperature at the horizontal mid-plane were measured. Three cells of different heights L, all filled with water and all with aspect ratio T close to 1 were used. For each L, about 1.5 decades in Ra were covered, together spanning the ränge 108 < Ra < 1011. For the largest temperature difference between the bottom and top plates of ? = 40K the kinematic viscosity and the thermal expansion coefficient, due to their temperature dependence, varied by more than a factor of two. The Oberbeck-Boussinesq (OB) approximation of temperature independent material parameters thus was no longer valid. The ratio Ï? of the temperature drops across the bottom and top thermal boundary layers became as small as Ï? = 0.83, as compared to the ratio Ï? = 1 in the OB case. Nevertheless, the Nusselt number Nu was found to be only slightly smaller (at most 1.4%) than in the next larger cell with the same Rayleigh number, where the material parameters were still nearly height-independent. The Reynolds numbers in the OB and NOB case agreed with each other within the experimental resolution of about 2%, showing that NOB effects for this parameter were small as well. Thus Nu and Re are rather insensitive against even significant deviations from OB conditions. Theoretically, we first account for the robustness of Nu with respect to NOB corrections: the NOB effects in the top boundary layer cancel those which arise in the bottom boundary layer as long as they are linear in the temperature difference ?. The net effects on Nu are proportional to ?2 and thus increase only slowly and still remain minor despite drastic material parameter changes. We then extend the Prandtl-Blasius boundary-layer theory to NOB Rayleigh-Benard flow with temperature dependent viscosity and thermal diffusivity. This allows the calculation of the shift of the bulk temperature, the temperature drops across the boundary layers, and the ratio Ï? without introducing any fitting parameter. The calculated quantities are in very good agreement with experiment. When in addition we use the experimental finding that for water the sum of the top and bottom thermal boundary-layer widths (based on the slopes of the temperature profiles at the plates) remains unchanged under NOB effects within experimental resolution, the theory also gives the measured small Nusseltnumber reduction for the NOB case. In addition, it predicts an increase by about 0.5% of the Reynolds number, which is also consistent with the experimental data. By theoretically studying hypothetical liquids with only one of the material parameters being temperature dependent, we shed further light on the origin of NOB corrections in water: While the NOB deviation of x from its OB value Ï? = 1 mainly originates from the temperature dependence of the viscosity, the NOB correction of the Nusselt number primarily originates from the temperature dependence of the thermal diffusivity. Finally, we give the predictions from our theory for the NOB corrections if glycerol is used as operating liquid.
Die Erscheinungsform einer bestimmten Einzelsprache resultiert aus dem Nebeneinander und Zusammenwirken vertikaler und horizontaler Transmission von sprachlichen Merkmalen und umfasst demzufolge normalerweise neben Phänomenen, die über eine Kette früherer Sprechergenerationen ererbt wurden, auch solche, die aus anderen Sprachen entlehnt wurden. Deutliche Spuren einer komplexen Entstehungsgeschichte und der Interaktion verschiedener Sprachgemeinschaften lassen sich nicht erst im Altägyptischen oder gar erst in der Sprache des Neuen Reiches ausmachen, sondern bereits die frühesten schriftlichen Quellen aus der Zeit um 3000 v. Chr. erlauben – trotz ihrer Knappheit – überraschende Einblicke in die zeitgenössischen sprachlichen Verhältnisse. Bislang nur durch Sprachvergleich rekonstruierbare Entwicklungen sind nunmehr historisch nachweisbar, und das phonologische System einer dem Altägyptischen vorausgehenden und erheblich von ihm abweichenden Sprachstufe wird greifbar. Da das Voraltägyptische ein für eine afroasiatische Sprache eher untypisches Konsonanteninventar besitzt und sich zudem lexikalische Übereinstimmungen (nicht-genetischer Natur) mit indoeuropäischen Sprachen abzeichnen, erscheinen fundierte Hypothesen über die Herausbildung des Ägyptischen nicht länger unmöglich. Damit wäre das Ägyptische nicht nur die am längsten bezeugte Einzelsprache der Menschheitsgeschichte, sondern wohl auch die einzige, die von ihrer Entstehung bis zu ihrem Aussterben schriftlich dokumentiert ist.
The development of modern science has depended strongly on specific features of the cultures involved; however, its results are widely and transculturally accepted and applied. The science and technology of electricity, for example, emerged as a specific product of post-Renaissance Europe, rooted in the Greek philosophical tradition that encourages explanations of nature in theoretical terms. It did not evolve in China presumably because such encouragement was missing. The transcultural acceptance of modern science and technology is postulated to be due, in part, to the common biological dispositions underlying human cognition, with generalizable capabilities of abstract, symbolic and strategic thought. These faculties of the human mind are main prerequisites for dynamic cultural development and differentiation. They appear to have evolved up to a stage of hunters and gatherers perhaps some 100 000 years ago. However, the extent of the correspondence between some constructions of the human mind and the order of nature, as revealed by science, is a late insight of the last two centuries. Unless we subscribe to extreme forms of constructivism or historical relativism, we may take the success and the formal structure of science as indications of a close, intrinsic relation between the physical and the mental, between the order of nature and the structure of human cognition. At the metatheoretical level, however, modern science is consistent with philosophical and cultural diversity.
When thinking about the historic landscape gardens of the Berlin-Brandenburg region we tend to focus automatically on the royal gardens that Peter Joseph Lenné originally included in his beautification plan for the Potsdam area that are now a UNESCO World Heritage Site. There is good reason for this focus. The complex of Sanssouci, Charlottenhof, Neuer Garten, Babelsberg, Glienicke, and Pfaueninsel constitutes an extraordinarily beautiful panorama. But from a broader perspective the unique character of these gardens can be seen to have informed the garden landscape of all of Berlin in a series of social transformations that occurred during the course of industrialisation in the nineteenth century. For this purpose it is useful to focus on the role of steam power. By no means, however, did the significance of steam power (or the lack of it) end with its utilitarian function, for it informed the aesthetic character of landscape gardens, too. And this character changed with the historical transformations that associated different sorts of gardens with people in different social strata. I will schematise three such »classes« of people and gardens.