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Unter den Schweizer Freunden Rilkes ist der Basler Historiker und Diplomat Carl Jacob Burckhardt (1891-1974) eine durchaus bemerkenswerte Gestalt. Die Entwicklung einer Beziehung zwischen dem jungen Mann aus Alt-Basler Familie und dem zunehmend vereinsamenden Prager Dichter zeigt auch der Briefwechsel zwischen beiden, der ganz im Kontext der "Schweizer Freunde" der zwanziger Jahre angesiedelt und zu lesen ist.
Four species of mole crickets (Orthoptera: Gryllotalpidae) are known from the West Indies: Neocurtilla hexadactyla (Perty), Scapteriscus abbreviatus Scudder, S. didactylus (Latreille), and S. imitatus Nickle and Castner. All are adventive (not native). We document their distributions in West Indian islands/countries by use of records from the literature and examination of specimens. Scapteriscus abbreviatus has been suggested to have arrived in, and been transported about the West Indies in ship ballast (immigration). Based on records of arrival in various parts of the West Indies and the species’ inability to fly, this suggestion seems reasonable. Scapteriscus imitatus pparently was released in Puerto Rico as a result of mistaken identification (introduction – arriving with assistance from humans – although inadvertent), and has not expanded its range in the West Indies. Although the principal mode of dispersal for the other two species also has been suggested to be ship ballast, we present an alternative based on flight which would seem at least equally as plausible. We suggest that S. didactylus could have dispersed by flight from South America through the Lesser Antilles; likewise N. hexadactyla probably from the Yucatan Peninsula to Cuba, and from South America northward through the Lesser Antilles, in at least some localities assisted by wind. Our zoogeographical alternative, if correct, means that the natural range expansions of these latter two species began very long ago and without human assistance – they were not introduced recently to the West Indies.
The traffic AAA-ATPase PilF is essential for pilus biogenesis and natural transformation of Thermus thermophilus HB27. Recently, we showed that PilF forms hexameric complexes containing six zinc atoms coordinated by conserved tetracysteine motifs. Here we report that zinc binding is essential for complex stability. However, zinc binding is neither required for pilus biogenesis nor natural transformation. A number of the mutants did not exhibit any pili during growth at 64 °C but still were transformable. This leads to the conclusion that type 4 pili and the DNA translocator are distinct systems. At lower growth temperatures (55 °C) the zinc-depleted multiple cysteine mutants were hyperpiliated but defective in pilus-mediated twitching motility. This provides evidence that zinc binding is essential for the role of PilF in pilus dynamics. Moreover, we found that zinc binding is essential for complex stability but dispensable for ATPase activity. In contrast to many polymerization ATPases from mesophilic bacteria, ATP binding is not required for PilF complex formation; however, it significantly increases complex stability. These data suggest that zinc and ATP binding increase complex stability that is important for functionality of PilF under extreme environmental conditions.
Three years after the advent of Zimbabwe's Inclusive Government in February 2009, the country still awaits the elections that people hope will lead to a more enduring political settlement. Zimbabwe: Mired in Transition reviews the experience of recent years assesses the progress that has been made. What is the public mood, and how has it changed? What steps have been taken to reform the media? How important is a new constitution. Although the economy has stabilised to some extent with the adoption of a multi-currency regime, industrial and agricultural production are depressed, and investment inflows are limited; what spaces exist for fiscal reform? Are local authority structures and the state bureaucracy equipped to handle the tasks that will ne asked of them? In terms of two important areas, the book extends its analysis further back than 2009. First, is the issue of emigration. Estimates of the number of Zimbabweans in the diaspora range from three to four million; what impact us this having on national development, and to what extent might the trend of migration be reversed? The second concerns young people, the chapter on which concludes: 'We already have a 'lost generation' - those who were once called the 'born frees'. Unless positive changes are made, we will still have another'. This collection of eleven essays examines in detail some of the pressing questions which Zimbabweans must ask as they chart a way forward.
Ovaj se rad bavi položajem zanaglasnica u kontekstu njegove obrade u nastavi hrvatskoga jezika u srednjim školama. S obzirom na to da pisani korpus pokazuje velika odstupanja od klasičnoga tumačenja Wackernagelova pravila (Peti-Stantić 2007), htjele smo ovu pojavu istražiti u kontekstu odnosa nastavnika hrvatskoga jezika prema poučavanju pravila o položaju zanaglasnica. Dosadašnji radovi u ovome području pokazuju različite težnje. Dok većina suvremenih gramatika (Babić i dr. 2007, Barić i dr. 2005, Težak i Babić 1994) staje u prilog prozodijskome tumačenju Wackernagelova pravila, prema kojemu se zanaglasnica uvrštava iza prve naglašene riječi u rečenici, neki suvremeni jezikoslovci (Peti-Stantić 2002, 2002a, 2006, 2007) zagovaraju sintaktičko tumačenje ovoga pravila u hrvatskome jeziku, prema kojemu se zanaglasnice smještaju iza prve naglašene sintaktičke jedinice. Ovi drugi svoje tvrdnje podupiru neskladom između propisanih pravila i stvarne uporabe, tj. korpusa, a naše se istraživanje bavi sličnim problemom – odnosom između načelnih i praktičnih elemenata poučavanja ovoga pravila. Ispitivanje predodžbe nastavnika o pravilu o položaju zanaglasnica u hrvatskome jeziku te prakse poučavanja toga pravila otkrilo je da nastavnici daju prednost prozodijskom tumačenju Wackernagelova pravila, no nisu skloni ispravljanju učenika koji ga drugačije primjenjuju.
You reap what you sow! differences in knowledge exchange effectiveness between communication types
(2014)
FOR KNOWLEDGE-INTENSIVE ORGANIZATIONS IN THE FINANCE INDUSTRY, AN EFFECTIVE KNOWLEDGE EXCHANGE AMONG EMPLOYEES IS CRUCIAL FOR THE COMPETITIVE PERFORMANCE. THEREFORE, COMPANIES INCREASINGLY RELY ON SOCIAL MEDIA PLATFORMS TO FACILITATE COMMUNICATION AND COLLABORATION. TO ENHANCE OUR UNDERSTANDING OF SUCCESSFUL COMMUNICATION IN ENTERPRISE SOCIAL MEDIA, WE APPLY HUMAN CODING AND QUANTITATIVE ANALYSIS TO THE CONTENT AND TONE OF 15,505 ENTERPRISE MICROBLOGGING MESSAGES CREATED BY 1,166 EMPLOYEES OF AN INTERNATIONAL FINANCIAL SERVICE PROVIDER. OUR RESULTS SUGGEST THAT A MORE FACTUAL-ORIENTED COMMUNICATION TYPE BENEFITS FROM A HIGHER KNOWLEDGE EXCHANGE EFFECTIVENESS COMPARED TO A PRIMARILY SELF-DISCLOSING COMMUNICATION TYPE.
D. Seleskovitch ve M. Lederer'in birlikte geliştirmiş oldukları Yorumlayıcı Çeviri (Anlam) Kuramı, çevirmeni merkeze koyan bir yaklaşım gösterir. Çeviriye ilişkin kuramsallaşmanın tarihine bakılırsa; önceki yüzyıllardan günümüze değin çevirmenin rolünü öne çıkaran görüş ve düşüncelere rastlanmaktadır. 90'lı yıllardan sonra belirginleşen bilişsel yaklaşımlar, alana yeni kazanımlar sağlamış, çeviribilim araştırmalarının uygulama alanına yansıyarak kültürlerarası veya dillerarası aktarımın başat aktörü olarak 'çevirmen'in bilişsel bakımdan yeniden değerlendirilmesine zemin hazırlamıştır. Bilişsel odaklı bir görünüm sergileyen çevirmen merkezli yaklaşımlar, çevirinin başarısının çevirmene bağlı olduğu görüşünden hareketle çevirmenin çeviri eylemi sırasında zihninde olup bitenlerin, bilişsel süreçlerinin işleyişinin ve dili kullanma mekanizmasının açıklığa kavuşturulmasını öngörür.
Bu çalışmanın amacı, Yorumlayıcı Çeviri Kuramı doğrultusunda 'anlama'nın koşulları olarak öne çıkan saptamaları ortaya koyarak çevirmenin sahip olması gereken özniteliklere ilişkin izdüşümleri serimlemektir. Bu amaç doğrultusunda, anlamın kavranması sürecinde çevirmenin zihinsel süreçlerinin nasıl işlediği, çevirmenin bu süreçleri nasıl yönettiği betimlenmeye ve söylem çözümlemesine dayanan Yorumlayıcı Çeviri Kuramı ve Yorumlayıcı Çeviri Yöntemi'nde yer alan düşünsel veriler görünür kılınmaya çalışılacaktır.
Dil öğretiminde geleneksel öğretmen merkezli ve dilbilgisi ağırlıklı metotlardan gitgide uzaklaşılmaktadır. Bu çalışmada işitsel ve görsel araçlardan biri olarak tiyatronun ders dışı sosyal aktivite olarak kullanımı ve öğrenimi hızlandırıcı etkisi incelenmiştir.
Bu amaç ile Akdeniz Üniversitesi Yabancı Diller Yüksekokulu tarafından Türkiye Burslusu 43 farklı ülkeden 70 öğrenciye (Tablo1) 30 Eylül 2013-27 Haziran 2014 tarihleri arasında verilen Türkçe eğitimi programı kullanılmıştır. Öğrencilere 960 saat Türkçe eğitimi verilmesinin yanı sıra haftada 2 saatten az olmamak üzere sosyal aktivite adı altında ek çalışmalara (koro, dans, tiyatro vs.) yönlendirilmişlerdir.
Bu çalışmada, hedef dilin öğretilmesinde tiyatro tekniğinin/ çalışmalarının öğrencinin hedef dildeki performansına etkisini belirlemek amacıyla ön test-son test kontrol gruplu yarı deneysel araştırma deseni kullanılmıştır.
Çalışma sonunda; Konuşma becerisi açısından bakıldığında Yabancı Dil Olarak Türkçe'nin Öğretilmesi (YDT) konusunda Akdeniz Üniversitesi Yabancı Diller Yüksekokulu bünyesinde ders dışında ‒ sosyal etkinlik olarak ‒ uygulanmakta olan Tiyatro Çalışmalarının öğrencilerin dil edinme performanslarına etkisinin olumlu olduğu bulgusuna ulaşılmıştır. Bununla beraber, üç alt bulgu da tespit edilmiştir: Konuşma becerisi açısından bakıldığında tiyatro çalışmalarını takip eden öğrenciler ile bu çalışmalara katılmayan öğrencilerin sınav sonuçları arasında belirli bir farklılığın olduğu sınav sonuçlarının analizi ile ortaya konulmuştur. Ayrıca, Yeterlik sınav sonucu değerlendirildiğinde tiyatro çalışmalarını takip eden öğrenciler ile bu çalışmalara katılmayan öğrencilerin sınav sonuçları arasında belirli bir farklılığın da tespiti yapılmıştır. Bunlara ek olarak, "Motivasyon açısından bakıldığında, tiyatro çalışmalarını takip eden öğrenciler ile bu çalışmalara katılmayan öğrencilerin sınav sonuçları arasında belirli bir farklılık var mıdır?" alt hipotezi de tiyatro çalışmalarının öğrenci motivasyonunu arttırdığı belirlenmiştir.
Bu bağlamda, her hafta hazırlanan öğrenci gelişim raporu ile öğrencinin dil gelişimi, motivasyonu ve öğrencinin ilgi alanları (müzik, dans, drama vs.) danışman öğretim elemanları tarafından değerlendirilmesi uygulamalarına gelecek akademik yıllarda da devam edilmesi kurumca kararlaştırılmıştır.
Wir führten eine Auswertung von 45 Vegetationsaufnahmen aus den beiden im Alpenraum gelegenen Schwerpunktreservaten „Totengraben“ (im FFH-Gebiet „Mangfallgebirge“) und „Wettersteinwald“ (im FFH-Gebiet „Wettersteingebirge“) durch. Ziel der Auswertung war eine operationale, staatenübergreifende Waldtypisierung auf pflanzensoziologischer, naturschutzfachlicher und standortsökologischer Basis. Auf Grundlage des bayerischen Naturwaldreservatforschungskonzeptes wurden in repräsentativen Kernflächen beider Reservate je 6 Vegetationsaufnahmen neu erhoben und zusammen mit bereits vorliegenden Daten verarbeitet. Die beiden Schwerpunktreservate repräsentieren ein Spektrum aus hochmontanen Bergmischwäldern, tiefsubalpinen Fichtenwäldern und hochsubalpinem Zirbenwald. Die Naturnähe ist v.a. nahe der alpinen Waldgrenze durch almwirtschaftliche Nutzung (Schwendung, Beweidung) reduziert und führte zur Ausbreitung von sekundären Alpenrosen-Latschengebüschen. Die Befunde ermöglichen Ableitungen für ein differenziertes Nutzungs- und Schutzkonzept außerhalb der Reservate, besonders für die umgebenden FFH-Gebiete. Die Bergmischwald- und Fichtenwald-Typen frischerer Standorte zeigen nach ihrem Standortspotenzial eine geringe Empfindlichkeit gegenüber Biomassenutzung. Außerhalb der Reservate ist für diese Typen eine multifunktionale nachhaltige Waldbewirtschaftung möglich, sofern einige kleinere Bestände mit sensiblen Reliktarten-Vorkommen als Refugien, Trittsteinbiotope und Spenderflächen ungenutzt bleiben. Die gegenüber Biomassenutzung sehr empfindlichen Karbonat-Bergmischwälder flachgründiger, mäßig trockener Standorte und die hochsubalpinen Zirbenwälder, bedürfen eines besonders schonenden „minimum intervention-“ bis hin zu einem „non-intervention management“. Typenbezogene Handlungsprioritäten können mittels des geographischen Informationssystems WINALP in die Gesamtfläche ihrer Vorkommen gebracht werden.
Wrack burial reduces germination and establishment of the invasive cordgrass Spartina densiflora
(2014)
Germination and emergence of halophytes may decrease significantly by seed burial in dead plant material, or wrack, which is common and abundant in tidal marshes. The effects of plant debris (wrack) burial on seed germination and seedling establishment of Spartina densiflora, an invasive cordgrass, were studied under greenhouse conditions and compared with field observations. Five wrack burial depths were applied: control without wrack, 1 cm (1235 ± 92 g DW wrack m-2), 2 cm (3266 ± 13 g DW m-2), 4 cm (4213 ± 277 g DW m-2), and 8 cm (6138 ± 227 g DW m-2). Sediment pH, electrical conductivity, redox potential and temperature were recorded. Quiescence increased with wrack load up to ~20% at 8 cm deep. Germination decreased with wrack load from 96% to 14%, which could be related with anoxic conditions under the debris since sediment redox potential was as low as -83 ± 7 mV at 8 cm. Germination percentage increased and quiescent and dormant percentages decreased at higher daily sediment temperatures and with higher daily temperature fluctuations, conditions that were recorded without or under low loads of wrack. Spartina densiflora did not show primary dormancy, but its seeds entered into a non-deep physiological dormancy below 1 cm deep in plant debris. The establishment of S. densiflora seedlings was also greatly reduced by wrack burial since only 6 seedlings (11 ± 5 % of germinated seeds) emerged above plant debris from 1 cm and all seedlings died from deeper than 1 cm. S. densiflora seedling development was also reduced by wrack burial. The inverse relationship between germination and emergence of S. densiflora with wrack burial recorded in our study is useful to predict its invasion dynamics and to plan the management of invaded marshes.
The article focuses on two objectives. First it addresses current trends in the lexical development of the German language. This investigation is based on changes within the section Fernsehabend to Fernsehzuschauerin in the "Duden – Deutsches Universalwörterbuch" between 1996 and 2011. Secondly, on the basis of the given section, the article examines to what extent this dictionary reflects current vocabulary.
This book addresses itself to mobilisation and involvement of rural people in development projects. It describes an imperfect but, nonetheless, exciting and thought-provoking exercise that drew social science researchers and students from four public universities in Kenya into an experiment in participatory research, community education and development in two locations. The experiment was grounded on the assumptions that the people of Kenya are a primary resource and that given proper roles and contribution of planners, researchers and programme implementers, self-sustainable development can become a reality. The contributors of this book have focused on the potential of the university to facilitate participation of the people in development. They have given specific suggestions on how this might be accomplished.
Der Aufsatz untersucht das syntaktische Verhalten nicht-satzförmiger Adverbialia im Deutschen und im brasilianischen Portugiesisch in vergleichender Perspektive. Behandelt werden Adverbialia aus sechs Klassen, deren semantische Funktionen von der Sachverhaltsbeschreibung bis zur Beschreibung von Handlungsabsichten des Sprechers reichen. Insgesamt zeigen sich große Ähnlichkeiten zwischen den Vergleichssprachen. Im Deutschen scheint eine etwas stärkere Tendenz zu bestehen, Adverbialia syntaktisch zu integrieren, während es im Portugiesischen mehr Möglichkeiten gibt, sie desintegriert zu verwenden.
Wo sind bloß die Ukrainer?
(2014)
Jetzt, nach Beendigung vieler Jahre der Lehre und Forschung an der Goethe-Universität, kann ich diese Zeit mit einem Abstand überdenken. Der Freiraum für solch nicht zweckgerichtetes Verhalten ist während der praktischen Tätigkeit an der Universität äußerst gering und muss hart erkämpft werden, wie jedes Stück Freiheit. Rückblickend sehe ich, dass der Wunsch, über das Detailwissen hinaus ganzheitliche Zusammenhänge zu betrachten und über die eigene Fachgrenze hinauszugehen, meinen Weg geprägt hat.
Ali Arbia von Zoon Politikon hat vor kurzem zusammen mit Beiträgen in der ZiB zur deutschen IB-Bloglandschaft einen kleinen Blogkarneval ausgerufen, in Kooperation mit dem Bretterblog und dem IR Blog. Als IB-BloggerInnen können wir es uns natürlich nicht nehmen, auf die Beiträge zu antworten. Liest man die bisherigen Artikel, so fällt auf: Von den drei immer wieder genannten Zielen des akademischen Bloggens – als Werkzeug in der Lehre, zur Vernetzung von Forschern und zur Außenwirkung der Disziplin – kommt vor allem letzteres zu kurz...
The term culture of knowledge has become a commonplace today and is circulating with a confusing diversity of meanings throughout various disciplines and fields, like Cultural Studies, Science Studies, History of Science, Epistemology, Sociology and History of Knowledge. This paper investigates the origins of the term culture of knowledge and discusses its various meanings, applications, and misconceptions in Cultural Theory, History of Science, Historical Epistemology and History of Knowledge. Finally, Ludwik Fleck's theory of thought-styles is proposed as an ideal model for describing specific cultures of knowledge.
'Innovation', 'Technologie', 'Grundlagenforschung' oder 'Exzellenz' gehören - wie viele andere Schlagworte auch - zum Vokabular, mit dem in unserer Gesellschaft über Wissenschaft, Forschung und Technik kommuniziert wird. Wissenschaftspolitische Expertinnen ebenso wie Laien, die sich auf die eine oder andere Weise mit Wissenschaft und Technik auseinandersetzen, scheinen ein Grundverständnis von dem zu haben, was mit diesen Begriffen gemeint ist. Versucht man sich jedoch an konkreten Deinitionen, so erweist sich das schnell als ein schwieriges Unterfangen. Die Begriffe sind vielschichtig, kontextabhängig und mitunter sehr unscharf. Als Bestandteile unserer wissenschaftspolitischen Sprache sind sie hochgradig normativ aufgeladen und können dabei sowohl negativ als auch positiv konnotiert sein.
Manche Wissenschaftler haben die Gabe, andere zu inspirieren. Sie ziehen talentierte junge Menschen an, sind gut vernetzt und bringen wiederum erfolgreiche Forscher hervor. Heike Jüngst spürt dem Erfolgsrezept der Begründer wissenschaftlicher Schulen an einem historischen und einem zeitgenössischen Beispiel nach.
The article focuses on Jacob Grimm's linguistic scholarship, taking into account biographical details, Grimm's conception of law and freedom, and his morality. Examples consist of original citations from Grimm's works, primarily his "Deutsche Grammatik" and "Deutsches Wörterbuch".
Hintergrund: Es ist unbekannt bzw. umstritten, ob die in Deutschland eingeführten Umweltzonen (UWZ) die Feinstaubbelastung nachweisbar reduzieren.
Methode: PM10-Konzentrationen von den Messstationen innerhalb und außerhalb der UWZ in 19 deutschen Städten wurden analysiert (Augsburg, Berlin, Dortmund, Duisburg, Düsseldorf, Essen, Frankfurt a. M., Hannover, Herrenberg, Ilsfeld, Karlsruhe, Köln, Ludwigsburg, Mannheim, München, Reutlingen, Stuttgart, Tübingen, Wuppertal), um die Wirksamkeit der Fahrverbote (Stufe 1) für Fahrzeuge der Schadstoffgruppe 1 (ohne Plakette) auf die Schadstoffkonzentration zu untersuchen. Kontinuierliche Halbstundenmesswerte und gravimetrische Tagesmittelwerte wurden für den Zeitraum von ca. 2005 bis Ende 2009 übernommen. Die Analyse beruht auf vier einander paarweise zugeordneten Messwerten als gematchte Quadrupel aus zwei Index- und zwei Referenzwerten (Indexstationen liegen innerhalb, Referenzstationen messen außerhalb der UWZ). Ein Indexwert und der simultan gemessene Referenzwert wurden während der aktiven Phase der UWZ gemessen, das andere Wertepaar wurde vor Einführung der UWZ erhoben. Die Wertepaare haben eine Zeitdifferenz von 364 Tagen oder von einem Vielfachen von 364 Tagen, wodurch die Jahreszeit, der Wochentag und die Tageszeit im Quadrupel konstant gehalten werden. Differenzen der Indexwerte wurden regressionstechnisch mit den Differenzen der Referenzwerte korrigiert, wobei meteorologische Parameter (Mischungsschichthöhe, Niederschlagsmenge, Windgeschwindigkeit), Schulferienzeiten, Phase der Umweltprämie, LKW-Fahrverbotszeiten und Ausgangswerte an den Index- und Referenzstationen als Kovariablen in sog. „fixed effects“ Regressionsanalysen der Quadrupel berücksichtigt wurden (Differenzwertmethode im Zwei-Perioden-Fall). Dieser statistische Ansatz wurde vor der eigentlichen Datenanalyse an simulierten Messdaten der FU Berlin erfolgreich erprobt.
Ergebnisse: 2 110 803 Quadrupel kontinuierlicher PM10-Messungen und 15 735 gravimetrische Quadrupel wurden aus den verfügbaren Daten der Messstationen identifiziert, aus denen 61 169 Quadrupel zu Tagesmittelwerten aufgebaut wurden. Die Analysen für die erste Stufe ergaben als beste Effektschätzer (an allen Indexstationen) eine Feinstaubreduktion von ≤ 0,2 μg/m3 (bzw. relative PM10-Reduktionen ≤ 1 %). Der beste Effektschätzer an allen Verkehrsstationen (also ohne städtische Hintergrund- und Industrieindexstationen) lag unterhalb von 1 μg/m3 (bzw. weniger als 5 %).
Schlussfolgerungen: Alle Analysewerte liegen damit unter den vor Einführung von UWZ prognostizierten Feinstaubreduktionen. Diese Studie untersuchte als erste übergreifend die Wirksamkeit von UWZ der Stufe 1 in Deutschland auf die Feinstaubkonzentrationen von PM10 nach einem einheitlichen Datensammlungs- und Analyseplan und unter Berücksichtigung möglichst vieler Störeinflüsse.
Die Snowden-Leaks an sich, insbesondere die von ihm an die Öffentlichkeit geleakten Powerpoint-Folien, haben es bereits in sich. Leicht zu verstehen sind sie aber nicht immer, es gibt schlicht zu viele Codenamen. Um so interessanter ist daher diese Mitschrift eines Vortrags von William Binney, einem ehemaligen technischen Direktor bei der NSA, der nach 37 Jahren Dienst ausschied und Whistleblower wurde. In diesem Vortrag erklärt Binney, was es mit der Überwachungsinfrastruktur der NSA auf sich hat, was hinter den ganzen Codenamen steckt und welche Implikationen das ganze hat...
Wir haben Geburtstag!
(2014)
Heute vor drei Jahren ist der Sipoblog gestartet. Anfangs noch als reines Studentenprojekt mit dem Schwerpunkt WikiLeaks, dann eingebettet in das Forschungsprojekt Sicherheitskultur im Wandel. Mittlerweile ist das Forschungsprojekt abgeschlossen, doch der Sipoblog hat überlebt – und feiert heute seinen dritten Geburtstag!
Wie bewältigen wir die Datenflut? : Neues DFG-Schwerpunkt-Programm zu Algorithmen für Big Data
(2014)
In ihrer Dissertation geht Kathrin Schrader der Frage nach, welche Selbsttechnologien Frauen entwickeln, deren Lebensrealitäten von der Verschränkung von Drogenkonsum und Sexarbeit geprägt sind. Auf der Basis von acht Interviews mit drogengebrauchenden Sexarbeiterinnen analysiert sie mittels einer gouvernementalitätstheoretischen Perspektive und der Intersektionalen Mehrebenenanalyse die Handlungsfähigkeiten im Kontext massiver gesellschaftlicher Diskriminierungen in den Subjektkonstruktionen der interviewten Frauen. Auf diese Weise kann sie sehr überzeugend die Wechselwirkungen von gesellschaftlichen Strukturen, Stereotypen und Diskursen sowie Identitätskonstruktionen herausarbeiten und leistet somit einen wichtigen Beitrag zur Dekonstruktion des gesellschaftlichen Umgangs mit dieser Gruppe.
This paper investigates the determinants of value and growth investing in a large administrative panel of Swedish residents over the 1999-2007 period. We document strong relationships between a household’s portfolio tilt and the household’s financial and demographic characteristics. Value investors have higher financial and real estate wealth, lower leverage, lower income risk, lower human capital, and are more likely to be female than the average growth investor. Households actively migrate to value stocks over the life-cycle and, at higher frequencies, dynamically offset the passive variations in the value tilt induced by market movements. We verify that these results are not driven by cohort effects, financial sophistication, biases toward popular or professionally close stocks, or unobserved heterogeneity in preferences. We relate these household-level results to some of the leading explanations of the value premium.
Abstract Trial-to-trial variability and spontaneous activity of cortical recordings have been suggested to reflect intrinsic noise. This view is currently challenged by mounting evidence for structure in these phenomena: Trial-to-trial variability decreases following stimulus onset and can be predicted by previous spontaneous activity. This spontaneous activity is similar in magnitude and structure to evoked activity and can predict decisions. Allof the observed neuronal properties described above can be accounted for, at an abstract computational level, by the sampling-hypothesis, according to which response variability reflects stimulus uncertainty. However, a mechanistic explanation at the level of neural circuit dynamics is still missing.
In this study, we demonstrate that all of these phenomena can be accounted for by a noise-free self-organizing recurrent neural network model (SORN). It combines spike-timing dependent plasticity (STDP) and homeostatic mechanisms in a deterministic network of excitatory and inhibitory McCulloch-Pitts neurons. The network self-organizes to spatio-temporally varying input sequences.
We find that the key properties of neural variability mentioned above develop in this model as the network learns to perform sampling-like inference. Importantly, the model shows high trial-to-trial variability although it is fully deterministic. This suggests that the trial-to-trial variability in neural recordings may not reflect intrinsic noise. Rather, it may reflect a deterministic approximation of sampling-like learning and inference. The simplicity of the model suggests that these correlates of the sampling theory are canonical properties of recurrent networks that learn with a combination of STDP and homeostatic plasticity mechanisms.
Author Summary Neural recordings seem very noisy. If the exact same stimulus is shown to an animal multiple times, the neural response will vary. In fact, the activity of a single neuron shows many features of a stochastic process. Furthermore, in the absence of a sensory stimulus, cortical spontaneous activity has a magnitude comparable to the activity observed during stimulus presentation. These findings have led to a widespread belief that neural activity is indeed very noisy. However, recent evidence indicates that individual neurons can operate very reliably and that the spontaneous activity in the brain is highly structured, suggesting that much of the noise may in fact be signal. One hypothesis regarding this putative signal is that it reflects a form of probabilistic inference through sampling. Here we show that the key features of neural variability can be accounted for in a completely deterministic network model through self-organization. As the network learns a model of its sensory inputs, the deterministic dynamics give rise to sampling-like inference. Our findings show that the notorious variability in neural recordings does not need to be seen as evidence for a noisy brain. Instead it may reflect sampling-like inference emerging from a self-organized learning process.
Langsam aber sicher fragt man sich, ob es überhaupt noch Sinn macht, aktuelle Enthüllungen über Geheimdienstaktivitäten als Aufhänger zu benutzen. Man hat sich schon so daran gewöhnt, dass es im Hintergrundrauschen untergeht. Aber versuchen wir es trotzdem noch mal: Hey, wer von den geneigten Lesern war auf der WikiLeaks Webseite? Oder The Pirate Bay? Ruft jemand „ja“ vor seinem Rechner? Sehr gut. Sagt „hallo“, denn ihr wurdet vom britischen Geheimdienst (GCHQ) und/oder der NSA erfasst. Snowden lässt grüßen, und wieder einmal fühlt man sich ein wenig unsicherer online. Aber keine Sorge, Angela Merkel und Francois Hollande haben einen Plan. Und die EU hat auch einen...
The administration of intravenous fluid to critically ill patients is one of the most common but also one of the most fiercely debated interventions in intensive care medicine. During the past decade, a number of important studies have been published which provide clinicians with improved knowledge regarding the timing, the type and the amount of fluid they should give to their critically ill patients. However, despite the fact that many thousands of patients have been enrolled in these trials of alternative fluid strategies, consensus remains elusive and practice is widely variable. Early adequate resuscitation of patients in shock followed by a restrictive strategy may be associated with better outcomes. Colloids such as modern hydroxyethyl starch are more effective than crystalloids in early resuscitation of patients in shock, and are safe when administered during surgery. However, these colloids may not be beneficial later in the course of intensive care treatment and should best be avoided in intensive care patients who have a high risk of developing acute kidney injury. Albumin has no clear benefit over saline and is associated with increased mortality in neurotrauma patients. Balanced fluids reduce the risk of hyperchloraemic acidosis and possibly kidney injury. The use of hypertonic fluids in patients with sepsis and acute lung injury warrants further investigation and should be considered experimental at this stage. Fluid therapy impacts relevant patient-related outcomes. Clinicians should adopt an individualized strategy based on the clinical scenario and best available evidence. One size does not fit all.