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- Geowissenschaften (9)
Es wird die Wiederentdeckung von Acalles droueti Crotch 1867 an Euphorbia stygiana auf Pico und Faial anläßlich einer Reise auf die Azoren im Sommer 2003 beschrieben. Die Biologie und Ökologie sowie die Habitatansprüche dieser Art werden vor dem Hintergrund der fortschreitenden Zerstörung des Laurisilva auf den Azoren dargestellt und diskutiert. Eine Liste der Curculionoidea-Beifänge und der Neufunde für die Azoren insgesamt (2 Arten) bzw. für einige Inseln (5 Arten) wird im Anhang vorgestellt.
Zucht von Kyklioacalles euphorbiophilus Stüben 2003 (Coleoptera: Curculionidae: Cryptorhynchinae)
(2003)
Kyklioacalles euphorbiophilus Stüben 2003 aus dem Hohen Atlas Marokkos wurde an der im Absterben begriffenen Entwicklungspflanze Euphorbia nicaeensis All. gezüchtet. Ausgehend von den Biotopbedingungen am Locus typicus werden die biotischen und abiotischen Faktoren bzw. methodischen Voraussetzungen dieser erfolgreichen Zucht vorgestellt. Anhand von 20 Abbildungen und 1 Video werden alle Phasen der Entwicklung und der Zucht dargestellt. In einer abschließenden Diskussion werden für weitere Zuchten flugunfähiger Cryptorhynchinae erste Anhaltspunkte geliefert.
Zwischen den Jahren 2002 und 2003 wurden im NSG "Alter Rhein bei Bienen-Praest" / Rechter Niederrhein / NRW und den umgebenden Flächen coleopterologische Bestandserhebungen durchgeführt. Im Untersuchungszeitraum wurden 581 Käferarten nachgewiesen. 61 Arten sind in der Roten Liste der BRD aufgeführt.
Vorliegender Beitrag geht davon aus, dass das Kulturphänomen "Deutsche Sprache" in Form und Gebrauch eine weitgehend regionale (areale) Inhomogenität aufweist. Im Argumentationsrahmen einer variationslinguistischen Dialektologie wird versucht, die diatopische Variationsbreite der deutschen Sprache zu umreißen und vor diesem Hintergrund eine spezifische bilinguale dialektale Kontaktvarietät des Deutschen (nämlich das sog. ,,Kontaktdeutsch") in ihrer synchron wie auch diachron überaus dynamischen Ausprägungsstruktur zu beschreiben und in das gegenwärtige Varietätenspektrum des Deutschen - sowohl hinsichtlich seiner Vetonung als auch seiner Dignität - einzuordnen. Somit soll auch zur Erforschung der inneren Dynamik der Varietätenvielfalt beigetragent werden.
Trotz einer allmählichen Hinwendung zu mehrsprachigen und multikulturellen Kontexten in den letzten Jahren gilt nach wie vor, dass den Paradigmen, Terminologien, Beschreibungsansätzen und Instrumentarien der Linguistik der meist unreflektierte Blickwinkel einsprachig und monokulturell sozialisierter Sprecher zugrunde liegt. So wurden z.B. die Sprachnormen bislang allenfalls aus der Sicht der Einsprachigkeit definiert, beschrieben und interpretiert. Die Perspektive bi- bzw. multilingualer Sprecher – einschließlich aller kulturellen Implikationen – wird in der Regel von den sprachwissenschaftlichen Auseinandersetzungen mit der Normen-Thematik ausgeschlossen. So hat auch Juhász, der bekannte ungarische Sprachgermanist, den bilingualen Diskursmodus zweisprachiger Personen als „einen Sprachgebrauch“ bezeichnet, „der sich nicht klassifizieren und noch weniger bewerten lässt“ (1986: 200). Meine Untersuchung beabsichtigt jedoch, die „prototypische“ Sprechweise und den kommunikativen Habitus4 bi- bzw. multilingualer Sprecher unter den Bedingungen gesellschaftlicher Zwei- bzw. Mehrsprachigkeit – ausgehend von der der Ingroup-Kommunikation bei Spontangesprächen unter Gruppenmitgliedern in verschiedenen Alltagssituationen – unter dem Gesichtspunkt der (sprachlichen und kommunikativen) Normen-Problematik zu beschreiben und zu hinterfragen sowie Aspekte ihrer Bewertung zu diskutieren. Damit soll ein Beitrag zur Modellierung bi- bzw. multilingualer und bi- bzw. transkultureller Sprachverhaltenssysteme – im Hinblick auf ihre Struktur, Hierarchie und Dynamik – geleistet werden. Als Exemplifikationsbereich dienen Belege aus dem sprachkommunikativen Verhalten von Ungarndeutschen.
The earliest known extensive texts in Gullah (and perhaps African American Vernacular English as well) to appear in print were published in The Riverside Magazine for Young People in November, 1868, under the title "Negro Fables" (p. 505-507). These are four animal stories, which the editor of the magazine, Horace Elisha Scudder, described in his column only as having been "taken down from the lips of an old negro, in the vicinity of Charleston" (see Appendix for the editor´s comments and the full text of the stories).2 The Story-Teller was evidently a genuine "man of words" (Abrahams, 1983), a true raconteur who could artistically embellish a simple traditional account (perhaps further embellished by the transcriber) in a variety of ways. That he commanded a certain range of Gullah is evident from particular signature features in the texts, but the absence of other typical Gullah features and the presence of shared Gullah/African American Vernacular English usages, together with the periodic appearance of standard English forms, demonstrate that these texts provide perhaps the earliest actual documentation (apart from early tertiary comments, cited e.g. in Feagin, 1997, p. 128-129) of register variation or style/code-switching among Gullah speakers. ...
In this paper we propose a compositional semantics for lexicalized tree-adjoining grammar (LTAG). Tree-local multicomponent derivations allow separation of the semantic contribution of a lexical item into one component contributing to the predicate argument structure and a second component contributing to scope semantics. Based on this idea a syntax-semantics interface is presented where the compositional semantics depends only on the derivation structure. It is shown that the derivation structure (and indirectly the locality of derivations) allows an appropriate amount of underspecification. This is illustrated by investigating underspecified representations for quantifier scope ambiguities and related phenomena such as adjunct scope and island constraints.
Zwei nahe verwandte, zugleich aber antinomische Begriffe markieren das Spannungsfeld, in dem vorliegender Beitrag einige Koordinaten aufzuweisen versucht: Geschichte und Geschichten. Ihr Verhältnis soll aus drei Perspektiven erörtert werden, zunächst hinsichtlich ihrer Rolle in der aktuellen Selbstaufklärung der Historie über ihren Status als "Textwissenschaft". Ein weiterer Abschnitt argumentiert historiographiegeschichtlich; er geht zurück auf die goethezeitliche Genese der Geschichte aus Geschichten. Ziel ist es, den poetikgeschichtlichen Ort der Geschichten, welche die Historie heute schreibt und denkt, zu umreißen. Wie "poetisch" und wie modern, lautet diese dritte Frage, sind die Texte der Geschichte - oder genauer: können sie sein?
Zu den wichtigsten Neuerungen der "Sattelzeit", dem Übergang von der alteuropäischen zur "modernen" Gesellschaft um 1800, gehört die Herausbildung und Etablierung einiger Begriffe, die sich durch ihre Fähigkeit auszeichnen, eine Vielzahl verstreuter Erscheinungen als kontinuierliches Ganzes zu präsentieren. "Kollektivsingulare" hat Reinhart Koselleck diese Begriffe genannt, zu denen beide Definienten des im vorliegenden Band umrissenen Forschungsbereichs zählen: "die Geschichte" ebenso wie "die Literatur". Diese und andere Kollektivsingulare integrieren, was in einer von der Erfahrung beschleunigter Veränderung geprägten Welt, in der das Wißbare beständig wächst, dem verstehenden Zugriff zu entgleiten droht. In der modernen Welt kommt oder – hier muß mittlerweile vielleicht einschränkt werden – kam ihnen daher eine kaum zu überschätzende kognitive wie lebenspraktische Funktion zu.
A taxonomic study of the Staphylinid subfamily Aleocharinae of the Australian Region is presented, including a critical revision of 14 typical series, the lectotype of which is designated when necessary. 10 new genera are deseribed (3 in Athetini, 2 in Thamiaraeini, and 5 in Oxypodini) and 38 species (3 in Gyrophaenini, 2 in Bolitocharini, 4 in Diestotini, 21 in Athetini, 5 in Thamiaraeini, and 3 in Oxypodini). New combinations are proposed for 12 species (l in Homalotini, 1 in Diestotini, 3 in Athetini, 6 in Oxypodini, and 1 in Aleocharini). The genus Correa Fauvel is considered junior synonym of the genus Aleochara. Every new genus and species is described and illustrated.
This is the most comprehensive analysis of higher-level relationships in Odonata conducted thus far. The analysis was based on a detailed study of the skeletal morphology and wing venation of adults, complemented with a few larval characters, resulting in 122 phylogenetically informative characters. Eighty-five genera from forty-five currently recognized families and subfamilies were examined. In most cases, several species were chosen to serve as exemplars for a given genus. The seven fossil outgroup taxa included were exemplar genera from five successively more distant odonatoid orders and suborders: Tarsophlebiidae (the closest sister group of Odonata, previously placed as a family within "Anisozygoptera"), Archizygoptera, Protanisoptera, Protodonata and Geroptera. Parsimony analysis of the data, in which characters were treated both under equal weights and implied weighting, produced cladograms that were highly congruent, and in spite of considerable homoplasy in the odonate data, many groupings in the most parsimonious cladograms were well supported in all analyses, as indicated by Bremer support. The analyses supported the monophyly of both Anisoptera and Zygoptera, contrary to the well known hypothesis of zygopteran paraphyly. Within Zygoptera, two large sister clades were indicated, one comprised of the classical (Selysian) Calopterygoidea, except that Amphipterygidae, which have traditionally been placed as a calopterygoid family, nested within the other large zygopteran clade comprised of Fraser´s "Lestinoidea" plus "Coenagrionoidea" (both of which were shown to be paraphyletic as currently defined). Philoganga alone appeared as the sister group to the rest of the Zygoptera in unweighted cladograms, whereas Philoganga + Diphlebia comprised the sister group to the remaining Zygoptera in all weighted cladograms. "Anisozygoptera" was confirmed as a paraphyletic assemblage that forms a "grade" towards the true Anisoptera, with Epiophlebia as the most basal taxon. Within Anisoptera, Petaluridae appeared as the sister group to other dragonflies.
Eine Nation ohne "Volk" ist nicht denkbar. Nationale Identität stellt sich nur her, wenn ein entsprechendes Bewußtsein sich über die oberen und gebildeten Stände hinaus auch bei den unteren Bevölkerungsschichten verankert. [...] Die Herausbildung patriotischen Engagements und (in dessen zeitlicher Folge) nationaler Identität vollzieht sich im Deutschland des 18. und frühen 19. Jahrhunderts in unterschiedlichen Phasen und Formen. Im Folgenden soll zunächst nach der Entstehung des Patriotismus, soweit er für die Volksaufklärung wichtig ist, gefragt und auf seine spezifischen Ausformungen und praktischen Konsequenzen gesehen werden, um sodann einen Blick auf die aus der gemeinnützig-patriotischen Reformbewegung entstehende Volksaufklärung selbst zu werfen. Welche Bedeutung hatte sie für die Vermittlung von Denkweisen und Haltungen, die sich bei deutschen Gebildeten bereits durchgesetzt hatten, welchen Einfluß nahm sie auf die beim „Volk“ verankerten Vorstellungen vom Funktionieren staatlicher und gesellschaftlicher Institutionen, welche Rolle spielte sie bei der Popularisierung patriotischen Denkens und für die Entstehung einer nationalen Identität? Die eigentliche Bedeutung der Volksaufklärung, dieses vorweg, dürfte darin liegen, daß hier in einem mehr als ein Jahrhundert dauerndem Prozeß die unteren Schichten der Bevölkerung überhaupt erst in die Nation mit einbezogen wurden und auch bei ihnen die Vorstellung von einer modernen Staatsbürgernation Fuß fassen konnte.
Goethe (1749 - 1832)
(2003)
Goethe: den "wahren Statthalter des poetischen Geistes auf Erden" hat Novalis ihn einst in der Romantiker-Zeitschrift "Athenäum" genannt. Es dürfte keine Nation geben, in der ein einziger Name zum Synonym für ihre Kultur geworden ist - die wichtigste kulturpolitische Institution Deutschlands trägt bezeichnenderweise seit dem Ende der Weimarer Republik den Namen Goethes -, keine Nation, die ein halbes Jahrhundert ihrer Literaturgeschichte nach einem einzigen Autor: als "Goethezeit" bezeichnet hat. Den Deutschen gilt Goethe mit fast noch größerer Selbstverständlichkeit als Homer den Griechen, Dante den Italienern, Cervantes den Spaniern, Shakespeare (mit langer Verzögerung) den Engländern oder Puschkin den Russen als ihr größter Dichter.
Folgender Aufsatz basiert auf [...]einem Vortrag "Cornelia und ihre Liebschaft", der am 26. August 1999 im früheren Emmendinger Wohnhaus ("Schlosserhaus") der Schwester Johann Wolfgang Goethes gehalten wurde. Organisation: Kulturamt der Stadt Emmendingen anlässlich des 250. Geburtstags des Dichters. Nach einer kurzen biographischen Übersicht, stehen folgende Überlegungen im Mittelpunkt dieser Arbeit: 1. soll verdeutlicht werden, woher Cornelia Goethes Männer - und Frauenideale stammen 2. wie Cornelia ihre Welt vergeblich nach diesen Idealen zu modellieren versuchte und 3. soll auf eine interessante, von der Forschung bis dahin wenig beachtete weibliche Figur im Leben Cornelias aufmerksam gemacht werden: Sophie von La Roche. Die Erstpublikation enthält einige vergleichende Betrachtungen (auf Portugiesisch) über D. Leonor de Almeida, Marquesa de Alorna, die im selben Jahr wie Cornelia Goethe geboren wurde, den Grafen von Oeynhausen heiratete und in Portugal als Dichterin und Übersetzerin unter dem Namen "Alcipe" Berühmtheit erlangte. Ein Erfolg und eine Art der Selbstverwirklichung, die Goethes Schwester versagt blieben. Während Sophie von La Roches und Alcipes Werke durch Wieland, bzw. Filinto Elysio, Anerkennung fanden und einem breiteren Publikum zugänglich gemacht wurden, blieben Cornelia Goethes schriftstellerische Ambitionen im Versuchsstadium stecken.
Die vorliegende Studie versteht sich als ein Beitrag zur Geschichte der Kanonbildung, sie führt an eine historische Nahtstelle, an der ein Kanon etabliert, verfestigt und schließlich verändert wird im Laufe von nur wenigen Generationen deutscher Autoren. Es handelt sich um die vielleicht aufregendste Epoche der deutschen Literatur- und Kulturgeschichte: die zweite Hälfte des 18. Jahrhunderts. Ausgangspunkt für diese Beobachtungen bildet nicht ein Text, sondern ein Werk der antiken Kunst, der Torso vom Belvedere, über dessen Wirkung freilich in Texten reflektiert wird. Der Literaturwissenschaftler neigt professionell dazu, sich einseitig auf den Text zu konzentrieren, aber gerade in der Kanondebatte zeigt es sich, daß gravierende ästhetische Entwicklungen sich nicht nur in einem Medium allein formieren: Kanonforschung ist per se interdisziplinäre Forschung.
Hedjaab dar aalmaan
(2003)
In this study we give a survey on bibliographic references on Judeo-Spanish Ianguage in the Orient, focusing mainly on the varieties of this Ianguage spoken in Sephardi communities of former Yugoslavia and on publications and articles that may offer the linguistic Corpora for further investigations on Judeo-Spanish language of these territories. The paper contains references on corpus-based descriptive studies and dictionaries of Judeo-Spanish language. Aspecial emphasis is uttached to the studies on Judeo-Spanish language on the territories of former Yugoslavia, which are classified geographically. The studies on the language of Sephardi Jews deal with this Romance Ianguage from different linguistic(s) perspectives. First of all, we presented the Hispanic studies on Judeo-Spanish that examine it as one of the modern Hispanicvarieties, consider it to be one of the sources of knowledge about the history of Spanish language or look at it from the sociolinguistic point of view. On the other hand, we had in mind works that try to examine Judeo-Spanish from the perspective of Jewish languages such a Yiddish and Judeo-Arab. In that sence it was necessary to draw atention to the studies that examine Ladino, written variefy of Judeo-Spanish based on literal translations of Biblical texts from Hebrew and Aramaic to Judeo-Spanish, We also incorporated references on works dedicated tovarious systems of transcription of Judeo-Spanish language. The actual Situation of Judeo-Spanish is presented with a short account of today's magazines and institutions dedicated to the preservation of Sephardi language and culture. Being the language an intrinsic part of fhe culture in which it arises and lives, we presented also the works dedicated to Sephardi culture and history of the communities in the Orient. Regarding the linguistic corpora in Judeo-Spanish, we presented the data on books published in Hebrew alphabet, collections of Songs, stories and sayings from Sephardi oral tradition, among which a Special importance has the Sephardi Romansero. We took into occount the periodical publications, which are very important as a source of linguistic and various cultural, sociological and historic corpora. The creation and development of periodical publications in Sephardi communities of former Yugoslavia (Belgrade, Sarajevo, and also IaterVriac and Zagreb) from the end of XIX until thefirst half of the XX century are described. The data on these publications are presented in the tables. Special attention was paid to ariicles written in Judeo-Spanish and published in periodical publications and monographies. The list of the most important articles consists of two parts: thefirst part is devoted to the articles published in Hebrew alphabet, and the second to the articles in Judeo-Spanish and Serbian published in Latin alphabet. The latter are organized thematically.
Die allgemein angewandten Namen der europäischen Orchideentaxa belaufen sich derzeit auf über 580 Namen, Synonyme nicht eingeschlossen. Die Übersicht soll die Namensfülle der gebräuchlichen Taxa und ihrer Synonyme (soweit erforderlich) in alphabetischer Reihenfolge aufzeigen. Taxa auf der Rangstufe der Varietät sind nicht enthalten.
We investigate unary regular languages and compare deterministic finite automata (DFA’s), nondeterministic finite automata (NFA’s) and probabilistic finite automata (PFA’s) with respect to their size. Given a unary PFA with n states and an e-isolated cutpoint, we show that the minimal equivalent DFA has at most n exp 1/2e states in its cycle. This result is almost optimal, since for any alpha < 1 a family of PFA’s can be constructed such that every equivalent DFA has at least n exp alpha/2e states. Thus we show that for the model of probabilistic automata with a constant error bound, there is only a polynomial blowup for cyclic languages. Given a unary NFA with n states, we show that efficiently approximating the size of a minimal equivalent NFA within the factor sqrt(n)/ln n is impossible unless P = NP. This result even holds under the promise that the accepted language is cyclic. On the other hand we show that we can approximate a minimal NFA within the factor ln n, if we are given a cyclic unary n-state DFA.
Das Subjekt: ein Trauerfall?
(2003)
Die Kraft der Vernunft wird heute von verschiedenen Seiten in Zweifel gezogen. Doch eine in Anerkenntnis ihrer Grenzen redliche Vernunft gibt dem Menschen immer noch die geeignetsten Mittel zur Lösung praktischer Probleme an die Hand. Der Mensch hat in der Vernuinft einen ihm wesenseigenen Zugang zur Welt, und die Theorien, die das Subjekt aus der Rechnung herauskürzen, tragen dazu bei, die Bezugnahme auf das für die Bewältigung praktischer, technischer und theoretischier Problemlagen geeigneteste menschliche Mittel, die Vernunft, zu diskreditieren. ...
Bernfried Leiber : Nachruf [auf den ehemaligen Arzt an der Frankfurter Universitäts-Kinderklinik]
(2003)
Nicht gut in Form : baulicher Zustand des Instituts für Sportwissenschaften lässt zu wünschen übrig
(2003)
Mit den beiden Herausgebern Klaus Herding und Otfried Schütz versucht Bettina Güdelhöfer, ... die "Geschichte" des Inventars zu rekapitulieren.
Vor wenigen Tagen ist die 50. Poetik-Gastdozentur an der Universität Frankfurt zu Ende gegangen. Wenn Elisabeth Borchers im Hörsaal VI über 'Lichtwelten' sprach, dann verkörperte sie das Prinzip dieser 'Vorlesungen': Seit 44 Jahren sprechen in Frankfurt bekannte deutschsprachige Autorinnen und Autoren über Literatur und über ihre eigenen Vorstellungen davon. Die 'Frankfurter Poetikdozentur' wurde über die Jahre zu einem Markenzeichen, das aus dem literarischen Leben Frankfurts wie Deutschlands nicht mehr wegzudenken ist. Anlass genug für einen kleinen Rückblick darauf, wie alles anfing.
Von Tops und Flops : wie die Universität Frankfurt beim ersten Forschungsranking abgeschnitten hat
(2003)
Vergangenes wird Gegenwart : Blick in die Arbeit des Theodor W. Adorno Archivs in Frankfurt am Main
(2003)
Eine wichtige Zielsetzung bei der Gestaltung und Unterstützung von online Diskursen ist die Motivation der Teilnehmenden zur aktiven Partizipation. Aspekte wie die technische Umsetzung, Zugangsregulierungen, Dauer und Art des Diskurses usw. zielen darauf ab, Teilnehmenden eine möglichst leicht handhabbare und aktive Beteiligung zu ermöglichen. Neben Fragen der technischen Umsetzung sind auch Gestaltungsaspekte wie Dauer und Phasen des Diskurses, sogenannte "Diskursdramaturgie", Beteiligungsformen und -formate, Zugangsrechte, Moderationsmethoden, Formen der Ergebnissicherung und Dokumentation zu planen.
Hochschulen müssen sich im Hinblick auf e-Learning mit der Frage konfrontieren, welche Strategien sie langfristig erfolgen wollen, an denen sie infrastrukturelle Maßnahmen und Unterstützungsangebote für Hochschullehrende ausrichten können. Neben einer bisher eher vielfältigen e-Learning Landschaft an Hochschulen lässt sich der längerfristige Einsatz neuer Medien in der Hochschullehre nur dann erfolgreich – und damit nachhaltig – gestalten, wenn Hochschulen und Politik sich mit grundsätzlichen strategischen Fragestellungen befassen. Dieser Beitrag beleuchtet einige dieser Fragen und gibt anschauliche Beispiele möglicher Lösungsansätze. Gleichzeitig wird auf das Innovationspotenzial neuer Medien in der Lehre hingewiesen, das sich auf der Ebene einzelner Lehrveranstaltungen, wie auch im Hinblick auf die curriculare Ausrichtung ganzer Fachbereiche auswirken kann. Letztendlich sollten neue Medien aber vor allem einen didaktischen und pädagogischen Mehrwert für die Hochschullehre erschließen.
Mechanisms by which subvisible cirrus clouds (SVCs) might contribute to dehydration close to the tropical tropopause are not well understood. Recently Ultrathin Tropical Tropopause Clouds (UTTCs) with optical depths around 10-4 have been detected in the western Indian ocean. These clouds cover thousands of square kilometers as 200-300 m thick distinct and homogeneous layer just below the tropical tropopause. In their condensed phase UTTCs contain only 1-5% of the total water, and essentially no nitric acid. A new cloud stabilization mechanism is required to explain this small fraction of the condensed water content in the clouds and their small vertical thickness. This work suggests a mechanism, which forces the particles into a thin layer, based on upwelling of the air of some mm/s to balance the ice particles, supersaturation with respect to ice above and subsaturation below the UTTC. In situ measurements suggest that these requirements are fulfilled. The basic physical properties of this mechanism are explored by means of a single particle model. Comprehensive 1-D cloud simulations demonstrate this stabilization mechanism to be robust against rapid temperature fluctuations of +/- 0.5 K. However, rapid warming (Delta T > 2 K) leads to evaporation of the UTTC, while rapid cooling (Delta T < -2 K) leads to destabilization of the particles with the potential for significant dehydration below the cloud
Obstacle detection is an important part of Video Processing because it is indispensable for a collision prevention of autonomously navigating moving objects. For example, vehicles driving without human guidance need a robust prediction of potential obstacles, like other vehicles or pedestrians. Most of the common approaches of obstacle detection so far use analytical and statistical methods like motion estimation or generation of maps. In the first part of this contribution a statistical algorithm for obstacle detection in monocular video sequences is presented. The proposed procedure is based on a motion estimation and a planar world model which is appropriate to traffic scenes. The different processing steps of the statistical procedure are a feature extraction, a subsequent displacement vector estimation and a robust estimation of the motion parameters. Since the proposed procedure is composed of several processing steps, the error propagation of the successive steps often leads to inaccurate results. In the second part of this contribution it is demonstrated, that the above mentioned problems can be efficiently overcome by using Cellular Neural Networks (CNN). It will be shown, that a direct obstacle detection algorithm can be easily performed, based only on CNN processing of the input images. Beside the enormous computing power of programmable CNN based devices, the proposed method is also very robust in comparison to the statistical method, because is shows much less sensibility to noisy inputs. Using the proposed approach of obstacle detection in planar worlds, a real time processing of large input images has been made possible.
Measurements of OH, total peroxy radicals, non-methane hydrocarbons (NMHCs) and various other trace gases were made at the Meteorological Observatory Hohenpeissenberg in June 2000. The data from an intensive measurement period characterised by high solar insolation (18-21 June) are analysed. The maximum midday OH concentration ranged between 4.5x106 molecules cm-3 and 7.4x106 molecules cm-3. The maximum total ROx (ROx =OH+RO+HO2+RO2) mixing ratio increased from about 55 pptv on 18 June to nearly 70 pptv on 20 and 21 June. A total of 64 NMHCs, including isoprene and monoterpenes, were measured every 1 to 6 hours. The oxidation rate of the NMHCs by OH was calculated and reached a total of over 14x106 molecules cm-3 s-1 on two days. A simple photostationary state balance model was used to simulate the ambient OH and peroxy radical concentrations with the measured data as input. This approach was able to reproduce the main features of the diurnal profiles of both OH and peroxy radicals. The balance equations were used to test the effect of the assumptions made in this model. The results proved to be most sensitive to assumptions about the impact of unmeasured volatile organic compounds (VOC), e.g. formaldehyde (HCHO), and about the partitioning between HO2 and RO2. The measured OH concentration and peroxy radical mixing ratios were reproduced well by assuming the presence of 3 ppbv HCHO as a proxy for oxygenated hydrocarbons, and a HO2/ RO2 ratio between 1:1 and 1:2. The most important source of OH, and conversely the greatest sink for peroxy radicals, was the recycling of HO2 radicals to OH. This reaction was responsible for the recycling of more than 45x106 molecules cm-3 s-1 on two days. The most important sink for OH, and the largest source of peroxy radicals, was the oxidation of NMHCs, in particular, of isoprene and the monoterpenes.
Subvisible cirrus clouds (SVCs) may contribute to dehydration close to the tropical tropopause. The higher and colder SVCs and the larger their ice crystals, the more likely they represent the last efficient point of contact of the gas phase with the ice phase and, hence, the last dehydrating step, before the air enters the stratosphere. The first simultaneous in situ and remote sensing measurements of SVCs were taken during the APE-THESEO campaign in the western Indian ocean in February/March 1999. The observed clouds, termed Ultrathin Tropical Tropopause Clouds (UTTCs), belong to the geometrically and optically thinnest large-scale clouds in the Earth´s atmosphere. Individual UTTCs may exist for many hours as an only 200--300 m thick cloud layer just a few hundred meters below the tropical cold point tropopause, covering up to 105 km2. With temperatures as low as 181 K these clouds are prime representatives for defining the water mixing ratio of air entering the lower stratosphere.
We report measurements of the deuterium content of molecular hydrogen (H2) obtained from a suite of air samples that were collected during a stratospheric balloon flight between 12 and 33 km at 40º N in October 2002. Strong deuterium enrichments of up to 400 permil versus Vienna Standard Mean Ocean Water (VSMOW) are observed, while the H2 mixing ratio remains virtually constant. Thus, as hydrogen is processed through the H2 reservoir in the stratosphere, deuterium is accumulated in H2 . Using box model calculations we investigated the effects of H2 sources and sinks on the stratospheric enrichments. Results show that considerable isotope enrichments in the production of H2 from CH4 must take place, i.e., deuterium is transferred preferentially to H2 during the CH4 oxidation sequence. This supports recent conclusions from tropospheric H2 isotope measurements which show that H2 produced photochemically from CH4 and non-methane hydrocarbons must be enriched in deuterium to balance the tropospheric hydrogen isotope budget. In the absence of further data on isotope fractionations in the individual reaction steps of the CH4 oxidation sequence, this effect cannot be investigated further at present. Our measurements imply that molecular hydrogen has to be taken into account when the hydrogen isotope budget in the stratosphere is investigated.
The main purpose of the paper is to explain the divergent paths of development of ethno-territorial protest movements in modern democratic political systems. By focusing on the interaction between these movements and the state, the different systems of accommodation between the relevant regional and central elites will be analyzed. The study concentrates on the case studies of Québec (Canada) and Corsica (France). The paper is divided into three parts. The first part describes the traditional systems of accommodation in France and Canada. The second part is focused on the process of socio-economic modernization in the 1950s and 1960s in those countries that threatened the established patterns of elite accommodation. The third part deals with the consequences for the established patterns of elite-accommodation and new concepts of territorial management that the central states tried to establish. By looking at the different degrees of centralization and decentralization in the mentioned political systems, the question of access to the political system by new social and political actors will be discussed in detail.
Klassenmedizin
(2003)
The identification of specific genetic (presenilin-1 [PS1] and amyloid precursor protein [APP] mutations) and environmental factors responsible for Alzheimer's disease (AD) has revealed evidence for a shared pathway of neuronal death. Moreover, AD-specific cell defects may be observed in many other nonneuronal cells (e.g., lymphocytes). Thus, lymphocytes may serve as a cellular system in which to study risk factors of sporadic, as well as genetic AD in vivo. The aim of our present study was to clarify whether lymphocytes bearing genetic or sporadic risk factors of AD share an increased susceptibility to cell death. Additionally we examined whether a cell typespecific vulnerability pattern was present and how normal aging, the main risk factor of sporadic AD, contributes to changes in susceptibility to cell death. Here, we report that lymphocytes affected by sporadic or genetic APP and PS1 AD risk factors share an increased vulnerability to cell death and exhibit a similar cell type-specific pattern, given that enhanced vulnerability was most strongly developed in the CD4+ T-cell subtype. In this paradigm, sporadic risk factors revealed the highest impact on cell type-specific sensitivity of CD4+ T cells to apoptosis. In contrast, normal aging results in an increased susceptibility to apoptosis of both, CD4+ and CD8+ T cells.
As major sources of reactive oxygen species (ROS), mitochondrial structures are exposed to high concentrations of ROS and may therefore be particularly susceptible to oxidative damage. Mitochondrial damage could play a pivotal role in the cell death decision. A decrease in mitochondrial energy charge and redox state, loss of transmembrane potential (depolarization), mitochondrial respiratory chain impairment, and release of substances such as calcium and cytochrome c all contribute to apoptosis. These mitochondrial abnormalities may constitute a part of the spectrum of chronic oxidative stress in Alzheimer's disease. Accumulation of amyloid beta (Abeta) in form of senile plaques is also thought to play a central role in the pathogenesis of Alzheimer's disease mediated by oxidative stress. In addition, increasing evidence shows that Abeta generates free radicals in vitro, which mediate the toxicity of this peptide. In our study, PC12 cells were used to examine the protective features of EGb 761(definition see editorial) on mitochondria stressed with hydrogen peroxide and antimycin, an inhibitor of complex III. In addition, we investigated the efficacy of EGb 761 in Abeta-induced MTT reduction in PC12 cells. Moreover, we examined the effects of EGb 761 on ROS levels and ROS-induced apoptosis in lymphocytes from aged mice after in vivo administration. Here, we will report that EGb 761 was able to protect mitochondria from the attack of hydrogen peroxide, antimycin and Abeta. Furthermore, EGb 761 reduced ROS levels and ROS-induced apoptosis in lymphocytes from aged mice treated orally with EGb 761 for 2 weeks. Our data further emphasize neuroprotective properties of EGb 761, such as protection against Abeta-toxicity, and antiapoptotic properties, which are probably due to its preventive effects on mitochondria.
Im März 2000 hat der Europäische Rat von Lissabon das strategische Ziel der EU formuliert, "die Union zum wettbewerbsfähigsten und dynamischsten wissensbasierten Wirtschaftsraum der Welt zu machen – ... der fähig ist, ein dauerhaftes Wirtschaftswachstum mit mehr und besseren Arbeitsplätzen und einem größeren sozialen Zusammenhalt zu schaffen". Die Umsetzung soll u. a. durch die "Offene Methode der Koordinierung" (OMK) vorangetrieben werden. Damit wird eine Leitungs- und Koordinierungsfunktion des Rates auch auf solchen Politikfeldern angestrebt, die nach dem Vertragsrecht in die alleinige Gestaltungskompetenz der Mitgliedstaaten fallen. Die OMK lässt sich als eine Art Benchmarking-Verfahren ohne unmittelbar verpflichtende Konsequenzen für die Mitgliedstaaten beschreiben. Ein ähnliches Vorgehen wird seit 1997 in der Beschäftigungspolitik praktiziert. Mit der Lissabon-Strategie wird die OMK sukzessive auf weitere sozialpolitische Bereiche ausgedehnt. Im Bereich der Alterssicherung kommt sie ebenso zum Einsatz wie bei der Bekämpfung von Armut und sozialer Ausgrenzung. Künftig wird auch die Gesundheitspolitik der Mitgliedsländer auf dem Prüfstand der OMK stehen.
Mismatch repair is a highly conserved system that ensures replication fidelity by repairing mispairs after DNA synthesis. In humans, the two protein heterodimers hMutSα (hMSH2‐hMSH6) and hMutLα (hMLH1‐hPMS2) constitute the centre of the repair reaction. After recognising a DNA replication error, hMutSα recruits hMutLα, which then is thought to transduce the repair signal to the excision machinery. We have expressed an ATPase mutant of hMutLα as well as its individual subunits hMLH1 and hPMS2 and fragments of hMLH1, followed by examination of their interaction properties with hMutSα using a novel interaction assay. We show that, although the interaction requires ATP, hMutLα does not need to hydrolyse this nucleotide to join hMutSα on DNA, suggesting that ATP hydrolysis by hMutLα happens downstream of complex formation. The analysis of the individual subunits of hMutLα demonstrated that the hMutSα–hMutLα interaction is predominantly conferred by hMLH1. Further experiments revealed that only the N‐terminus of hMLH1 confers this interaction. In contrast, only the C‐terminus stabilised and co‐immunoprecipitated hPMS2 when both proteins were co‐expressed in 293T cells, indicating that dimerisation and stabilisation are mediated by the C‐terminal part of hMLH1. We also examined another human homologue of bacterial MutL, hMutLβ (hMLH1–hPMS1). We show that hMutLβ interacts as efficiently with hMutSα as hMutLα, and that it predominantly binds to hMutSα via hMLH1 as well.
The volume changes of cesium under pressure are discussed with respect to the packing density of the atoms and valence. The element is univalent in densely packed Cs I and Cs II. Valence increases in Cs III (packing density q = 0.973), in Cs IV (q = 0.943), in Cs V (q ~ 0.99), and in close packed Cs VI. The diminuition of volume beyond ~ 15 GPa is caused by this increase only which implies that electrons of the fifth shell act as valence electrons.
Abstract Geant4 is a toolkit for simulating the passage of particles through matter. It includes a complete range of functionality including tracking, geometry, physics models and hits. The physics processes offered cover a comprehensive range, including electromagnetic, hadronic and optical processes, a large set of long-lived particles, materials and elements, over a wide energy range starting, in some cases, from 250 eV and extending in others to the TeV energy range. It has been designed and constructed to expose the physics models utilised, to handle complex geometries, and to enable its easy adaptation for optimal use in different sets of applications. The toolkit is the result of a worldwide collaboration of physicists and software engineers. It has been created exploiting software engineering and object-oriented technology and implemented in the C++ programming language. It has been used in applications in particle physics, nuclear physics, accelerator design, space engineering and medical physics. PACS: 07.05.Tp; 13; 23
Abstract: The measured particle ratios in central heavy-ion collisions at RHIC-BNL are investigated within a chemical and thermal equilibrium chiral SU(3) Ã É approach. The commonly adopted non-interacting gas calculations yield temperatures close to or above the critical temperature for the chiral phase transition, but without taking into account any interactions. In contrast, the chiral SU(3) model predicts temperature and density dependent effective hadron masses and effective chemical potentials in the medium and a transition to a chirally restored phase at high temperatures or chemical potentials. Three different parametrizations of the model, which show different types of phase transition behaviour, are investigated. We show that if a chiral phase transition occured in those collisions, freezing of the relative hadron abundances in the symmetric phase is excluded by the data. Therefore, either very rapid chemical equilibration must occur in the broken phase, or the measured hadron ratios are the outcome of the dynamical symmetry breaking. Furthermore, the extracted chemical freeze-out parameters differ considerably from those obtained in simple non-interacting gas calculations. In particular, the three models yield up to 35 MeV lower temperatures than the free gas approximation. The inmedium masses turn out to differ up to 150 MeV from their vacuum values.
Pion-kaon correlation functions are constructed from central Au+Au STAR data taken at sqrt[sNN]=130 GeV by the STAR detector at the Relativistic Heavy Ion Collider (RHIC). The results suggest that pions and kaons are not emitted at the same average space-time point. Space-momentum correlations, i.e., transverse flow, lead to a space-time emission asymmetry of pions and kaons that is consistent with the data. This result provides new independent evidence that the system created at RHIC undergoes a collective transverse expansion.
Data from the first physics run at the Relativistic Heavy-Ion Collider at Brookhaven National Laboratory, Au+Au collisions at sqrt[sNN]=130 GeV, have been analyzed by the STAR Collaboration using three-pion correlations with charged pions to study whether pions are emitted independently at freeze-out. We have made a high-statistics measurement of the three-pion correlation function and calculated the normalized three-particle correlator to obtain a quantitative measurement of the degree of chaoticity of the pion source. It is found that the degree of chaoticity seems to increase with increasing particle multiplicity.
We report high statistics measurements of inclusive charged hadron production in Au+Au and p+p collisions at sqrt[sNN]=200 GeV. A large, approximately constant hadron suppression is observed in central Au+Au collisions for 5<pT<12 GeV/c. The collision energy dependence of the yields and the centrality and pT dependence of the suppression provide stringent constraints on theoretical models of suppression. Models incorporating initial-state gluon saturation or partonic energy loss in dense matter are largely consistent with observations. We observe no evidence of pT-dependent suppression, which may be expected from models incorporating jet attenuation in cold nuclear matter or scattering of fragmentation hadrons.
We report measurements of single-particle inclusive spectra and two-particle azimuthal distributions of charged hadrons at high transverse momentum (high pT) in minimum bias and central d+Au collisions at sqrt[sNN]=200 GeV. The inclusive yield is enhanced in d+Au collisions relative to binary-scaled p+p collisions, while the two-particle azimuthal distributions are very similar to those observed in p+p collisions. These results demonstrate that the strong suppression of the inclusive yield and back-to-back correlations at high pT previously observed in central Au+Au collisions are due to final-state interactions with the dense medium generated in such collisions.
We present the results of charged particle fluctuations measurements in Au+Au collisions at sqrt[sNN ]=130 GeV using the STAR detector. Dynamical fluctuations measurements are presented for inclusive charged particle multiplicities as well as for identified charged pions, kaons, and protons. The net charge dynamical fluctuations are found to be large and negative providing clear evidence that positive and negative charged particle production is correlated within the pseudorapidity range investigated. Correlations are smaller than expected based on model-dependent predictions for a resonance gas or a quark-gluon gas which undergoes fast hadronization and freeze-out. Qualitative agreement is found with comparable scaled p+p measurements and a heavy ion jet interaction generation model calculation based on independent particle collisions, although a small deviation from the 1/N scaling dependence expected from this model is observed.
The balance function is a new observable based on the principle that charge is locally conserved when particles are pair produced. Balance functions have been measured for charged particle pairs and identified charged pion pairs in Au+Au collisions at sqrt[sNN]=130 GeV at the Relativistic Heavy Ion Collider using STAR. Balance functions for peripheral collisions have widths consistent with model predictions based on a superposition of nucleon-nucleon scattering. Widths in central collisions are smaller, consistent with trends predicted by models incorporating late hadronization.
Azimuthal anisotropy (v2) and two-particle angular correlations of high pT charged hadrons have been measured in Au+Au collisions at sqrt[sNN]=130 GeV for transverse momenta up to 6 GeV/c, where hard processes are expected to contribute significantly. The two-particle angular correlations exhibit elliptic flow and a structure suggestive of fragmentation of high pT partons. The monotonic rise of v2(pT) for pT<2 GeV/c is consistent with collective hydrodynamical flow calculations. At pT>3 GeV/c, a saturation of v2 is observed which persists up to pT=6 GeV/c.
Azimuthal anisotropy (v2) and two-particle angular correlations of high pT charged hadrons have been measured in Au+Au collisions at sqrt[sNN]=130 GeV for transverse momenta up to 6 GeV/c, where hard processes are expected to contribute significantly. The two-particle angular correlations exhibit elliptic flow and a structure suggestive of fragmentation of high pT partons. The monotonic rise of v2(pT) for pT<2 GeV/c is consistent with collective hydrodynamical flow calculations. At pT>3 GeV/c, a saturation of v2 is observed which persists up to pT=6 GeV/c.
U.S. investors hold much less international stock than is optimal according to mean–variance portfolio theory applied to historical data. We investigated whether this home bias can be explained by Bayesian approaches to international asset allocation. In comparison with mean–variance analysis, Bayesian approaches use different techniques for obtaining the set of expected returns by shrinking the sample means toward a reference point that is inferred from economic theory. Applying the Bayesian approaches to the field of international diversification, we found that a substantial home bias can be explained when a U.S. investor has a strong belief in the global mean–variance efficiency of the U.S. market portfolio, and in this article, we show how to quantify the strength of this belief. We also found that one of the Bayesian approaches leads to the same implications for asset allocation as the mean–variance/tracking-error criterion. In both cases, the optimal portfolio is a combination of the U.S. market portfolio and the mean–variance-efficient portfolio with the highest Sharpe ratio.
"Nicht-Ereignisse", Lebensenttäuschungen aufgrund des dauerhaften Ausbleibens erwünschter Ereignisse oder des Nicht-Erreichens von bedeutsamen Lebenszielen, können zu existenziellen Krisen führen. Die Autoren haben 40 Personen befragt und an ihrem Beispiel die Bewältigungsprozesse solcher Krisen untersucht, die z.B. durch ungewollte Kinderlosigkeit oder eine ausgebliebene berufliche Karriere ausgelöst worden waren. Dabei fanden sie verschiedene Prozesshilfen: kognitive und emotionale Verarbeitungsprozesse, soziale Unterstützung, Ersatzaktivitäten und pragmatisches Handeln. Alle Befragten berichteten von Entwicklungsgewinnen aufgrund der Krise und ihrer Bewältigung.
Die Zunahme an Gewalttaten, insbesondere durch Kinder und Jugendliche, wird in der öffentlichen und pädagogischen Diskussion weithin beklagt. Zwar zeigen zeitvergleichende Analysen, dass von einer dramatischen Erhöhung der Gewalhandlungen keine Rede sein kann; eher ist die öffentliche Sensibilität für derartige Vorfälle gestiegen. Andererseits gibt es erschreckende Beispiele für besonders brutale Übergriffe, die im öffentlichen Bewusstsein naturgemäß dominieren. Eindeutig zugenommen haben in den letzten Jahren politisch motivierte Gewalttaten, insbesondere mit rechtsextremistischem Hintergrund. Doch unabhängig davon, ob und wo die Zahl der Gewalthandlungen angestiegen ist, beinhaltet jede einzelne Tat einen Angriff auf die Menschenwürde und die politische Kultur und ruft deshalb nach Gegenmaßnahmen.
Temporal changes in the occurrence of extreme events in time series of observed precipitation are investigated. The analysis is based on a European gridded data set and a German station-based data set of recent monthly totals (1896=1899–1995=1998). Two approaches are used. First, values above certain defined thresholds are counted for the first and second halves of the observation period. In the second step time series components, such as trends, are removed to obtain a deeper insight into the causes of the observed changes. As an example, this technique is applied to the time series of the German station Eppenrod. It arises that most of the events concern extreme wet months whose frequency has significantly increased in winter. Whereas on the European scale the other seasons also show this increase, especially in autumn, in Germany an insignificant decrease in the summer and autumn seasons is found. Moreover it is demonstrated that the increase of extreme wet months is reflected in a systematic increase in the variance and the Weibull probability density function parameters, respectively.
The climate system can be regarded as a dynamic nonlinear system. Thus, traditional linear statistical methods fail to model the nonlinearities of such a system. These nonlinearities render it necessary to find alternative statistical techniques. Since artificial neural network models (NNM) represent such a nonlinear statistical method their use in analyzing the climate system has been studied for a couple of years now. Most authors use the standard Backpropagation Network (BPN) for their investigations, although this specific model architecture carries a certain risk of over-/underfitting. Here we use the so called Cauchy Machine (CM) with an implemented Fast Simulated Annealing schedule (FSA) (Szu, 1986) for the purpose of attributing and detecting anthropogenic climate change instead. Under certain conditions the CM-FSA guarantees to find the global minimum of a yet undefined cost function (Geman and Geman, 1986). In addition to potential anthropogenic influences on climate (greenhouse gases (GHG), sulphur dioxide (SO2)) natural influences on near surface air temperature (variations of solar activity, explosive volcanism and the El Nino = Southern Oscillation phenomenon) serve as model inputs. The simulations are carried out on different spatial scales: global and area weighted averages. In addition, a multiple linear regression analysis serves as a linear reference. It is shown that the adaptive nonlinear CM-FSA algorithm captures the dynamics of the climate system to a great extent. However, free parameters of this specific network architecture have to be optimized subjectively. The quality of the simulations obtained by the CM-FSA algorithm exceeds the results of a multiple linear regression model; the simulation quality on the global scale amounts up to 81% explained variance. Furthermore the combined anthropogenic effect corresponds to the observed increase in temperature Jones et al. (1994), updated by Jones (1999a), for the examined period 1856–1998 on all investigated scales. In accordance to recent findings of physical climate models, the CM-FSA succeeds with the detection of anthropogenic induced climate change on a high significance level. Thus, the CMFSA algorithm can be regarded as a suitable nonlinear statistical tool for modeling and diagnosing the climate system.
Observed global and European spatiotemporal related fields of surface air temperature, mean-sea-level pressure and precipitation are analyzed statistically with respect to their response to external forcing factors such as anthropogenic greenhouse gases, anthropogenic sulfate aerosol, solar variations and explosive volcanism, and known internal climate mechanisms such as the El Niño-Southern Oscillation (ENSO) and the North Atlantic Oscillation (NAO). As a first step, a principal component analysis (PCA) is applied to the observed spatiotemporal related fields to obtain spatial patterns with linear independent temporal structure. In a second step, the time series of each of the spatial patterns is subject to a stepwise regression analysis in order to separate it into signals of the external forcing factors and internal climate mechanisms as listed above as well as the residuals. Finally a back-transformation leads to the spatiotemporally related patterns of all these signals being intercompared. Two kinds of significance tests are applied to the anthropogenic signals. First, it is tested whether the anthropogenic signal is significant compared with the complete residual variance including natural variability. This test answers the question whether a significant anthropogenic climate change is visible in the observed data. As a second test the anthropogenic signal is tested with respect to the climate noise component only. This test answers the question whether the anthropogenic signal is significant among others in the observed data. Using both tests, regions can be specified where the anthropogenic influence is visible (second test) and regions where the anthropogenic influence has already significantly changed climate (first test).
Der Magnetstein - Wozu braucht es Materialien zum Sachunterricht : Ein Gespräch mit Horst Rumpf
(2003)
Dem Leser einer Reihe von Veröffentlichungen zur Didaktik des Sachunterrichts fällt auf, dass es bei aller Vielzahl von Differenzen und Differenzierungen zu didaktischen und pädagogischen Fragen so etwas wie eine - mehr implizite als explizite - Übereinstimmung in der Konstitution des Gegenstandes "Sache" zu geben scheint. Die "Sache" ist danach das zu Erkennende; der Sachunterricht soll entsprechend den Schüler in die Lage versetzen, zu erkennen, was gegeben ist. Aus einer jüngeren erkenntnistheoretischen Sicht lässt sich die Haltbarkeit dieser Grundannahme bezweifeln. Im Durchgang durch einige Konzepte zur Didaktik des Sachunterrichts soll dieser Zweifel begründet werden.
First results on the production of Xi- and Anti-xi hyperons in Pb+Pb interactions at 40 A GeV are presented. The Anti-xi/Xi- ratio at midrapidity is studied as a function of collision centrality. The ratio shows no significant centrality dependence within statistical errors; it ranges from 0.07 to 0.15. The Anti-xi/Xi- ratio for central Pb+Pb collisions increases strongly with the collision energy.