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Search Results: 1 - 10 of 1621 matches for " Huber "
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Activation/Inhibition of mast cells by supra-optimal antigen concentrations
Michael Huber
Cell Communication and Signaling , 2013, DOI: 10.1186/1478-811x-11-7
Vegetacion y flora de Pantepui, Region Guayana
Huber, Otto;
Acta Botanica Brasilica , 1987, DOI: 10.1590/S0102-33061987000300005
Abstract: the biogeographical province pantepui, which is herewith defined as the entirety of orographic ecosystems developed in the table mountains ("tepuis") of the guayana shield region above 1.200/1.500 m a.s.1., presents a varied and highly evolved vegetation composed of a specialized flora of some 2.000 - 2.500 species. it harbours two endemic families, the saccifoliaceae and the tepuianthaceae, the latter with a somewhat wider extension into the guayana lowlands. the most important families from the systematic as well ecologic point of view are the asteraceae, rubiaceae, theaceae, ochnaceae, rapateaceae, eriocaulaceae, xyridaceae, bromeliaceae, and cyperaceae. the plant cover consists of a great number of different vegetation types, belonging essentially to four plant formations: the arboreal (low tepui forests), the scrub formation (tepui scrub, paramoid scrub), the herbaceous (tepui meadows), and the pioneer formation on open rocks (lithophytic vegetation). other than the consistent stock of endemic, autochthonous taxa, the phytogeographical relationships of the pantepui flora are with the high andrean flora, the guayanan and amazonian lowland flora, the general neotropical flora, and the pantropical or cosmopolitan flora
Explicit solutions of the Rand Equation
A Huber
International Journal of Engineering, Science and Technology , 2010,
Abstract: In this paper the meaning of a nonlinear partial differential equation (nPDE) of the third-order is shown to the first time. The equation is known as the ‘Rand Equation’ and belongs to a class of less studied nPDEs. Both the explicit physical meaning as well as the behaviour is not known until now. Therefore we believe it is indispensable to study this evolution equation in detail. We perform a classical Lie Group analysis to analyze the point symmetries. By using a similarity reduction we are able to deduce more classes of solutions of general character. Special nonlinear transformations are given in a most general form. In addition, we also study Lie’s non-classical case relating to potential and generalized symmetries. Both the potential and approximate symmetries are discussed to the first time leading to new results. So we expect a better understanding and concrete physical as well as technical application in future.
The physical meaning of a nonlinear evolution equation of the fourth order relating to locally and non-locally supercritical waves
A Huber
International Journal of Engineering, Science and Technology , 2010,
Abstract: In this paper the physical meaning of a nonlinear partial differential equation (nPDE) of the fourth order relating to wave theory is deduced to the first time. The equation under consideration belongs to a class of less studied nPDEs and an explicit physical meaning is not known until now. This paper however bridges the gap between some known results and a concrete application concerning wave theory. We show how one can derive locally supercritical solitary waves as well as locally and nonlocally forced supercritical waves and analytical solutions are given explicitly.
Imaging the brain: visualising “pathological entities”? Searching for reliable protocols within psychiatry and their impact on the understanding of psychiatric diseases
Lara Huber
Poiesis & Praxis , 2009, DOI: 10.1007/s10202-008-0055-1
Abstract: Face à l’augmentation nette des visualisations qui se base sur l’imagerie médicale ces derniers décennies, la présence des coupes du cerveau codé en couleur qui ont générées sur des applications fonctionelles a contribué à la supposition de pouvoir extrapoler si un individu est affecté par un syndrome neurologique, neuropsychologique ou psychiatrique des profils cognitives (“kinds” of brains). Dans le contexte clinique, il est notamment indispensable de remarquer que des visualisations qui se base sur l’imagerie médicale sont suggestive à plus d’un point de vue. Les enregistrements de l’imagerie médicale ne seulement visualisent des entités pathologiques, mais aussi représentent les états psychophysiques d’une manière objective et concrète. D’une vue epistemologique, cet article débat des aspects clé des visualisations qui se base sur des applications fonctionelles des neurosciences.
On an improved method for solving evolution equations of higher order importantly in science and technology
A Huber
International Journal of Engineering, Science and Technology , 2010,
Abstract: In this paper we introduce a new algebraic procedure to compute new classes of solutions of (1+1)-nonlinear partial differential equations (nPDEs) both of physical and technical relevance. The basic assumption is that the unknown solution(s) of the nPDE under consideration satisfy an ordinary differential equation (ODE) of the first order that can be integrated completely. This solution manifold of these first-order ODEs play an essential part in solving given nPDEs. A further important aspect however is the fact that we have the freedom in choosing some parameters bearing positively on the algorithm and hence, the solution-manifold of any nPDEs under consideration are therefore augmented naturally. The present algebraic procedure can widely use to study many nPDE and is not only restricted to time-dependent problems. We note that no numerical methods are necessary and so analytical closed-form classes of solutions result. The algorithm works accurately, is clear structured and can be converted in any computer language. On the contrary it is worth to stress the necessity of such sophisticated methods since a general theory of nPDEs does not exist.
Waves, conservation laws and symmetries of a third-order nonlinear evolution equation
A Huber
International Journal of Engineering, Science and Technology , 2010,
Abstract: In this paper a less studied nonlinear partial differential equation of the third-order is under consideration. Important properties concerning advanced character such like conservation laws and the equation of continuity are given. Characteristic wave properties such like dispersion relations and both the group and phase velocities are derived explicitly. In addition, we discuss the non-classical case relating to potential symmetries for the first time. Further, for practical applications in several domains of sciences we discuss in detail approximate symmetries. Finally, as a further new contribution we deduce new generalized symmetries of lower order. Some important notes relating to future intensions are given. Key Words: Nonlinear partial differential equations, evolution equations, symmetries.
Hypergeometric functions with rational arguments
Huber, T.
High Energy Physics - Phenomenology , 2008, DOI: 10.1016/j.nuclphysbps.2008.09.110
Abstract: We elaborate on the expansion of hypergeometric functions about rational parameters, where we focus mainly on the integer and half-integer case. The strategy and the basic steps of a recently developed algorithm for the expansion about half-integer parameters are described. The algorithm is implemented in the Mathematica package HypExp, by means of which we derive (partially new) results of selected multi-loop Feynman diagrams. Moreover, we give a new formulation of a conjecture in the context of a three-loop master integral in HQET.
Die Angst des Wissenschaftlers vor der sthetik. Zu Jo Reichertz: Zur Gültigkeit von Qualitativer Sozialforschung The Scientist's Fear of Aesthetics. Reply to Jo Reichertz' "On the Problem of Validity of Qualitative Research El miedo del científico a la estética. A Jo Reichertz' "Sobre el problema de la validez de la investigación cualitativa
Andreas Huber
Forum : Qualitative Social Research , 2001,
Abstract: Gegen Jo REICHERTZ' intelligenten Beitrag "Zur Gültigkeit von Qualitativer Sozialforschung" kann argumentativ nur wenig entgegenhalten werden. Ziel des folgenden Beitrags ist es auch nicht, REICHERTZ' Ausführungen zu widersprechen, sondern sie im Gegenteil mit weiteren Argumenten zu erg nzen. Aus diesen werden freilich andere Schlu folgerungen gezogen, als es REICHERTZ tut: Nicht rigide "Modelle zur Qualit tssicherung" sind prim r in den Sozialwissenschaften gefragt, sondern vielmehr eine ffnung von der "reinen" Wissenschaft in Richtung sthetik, Kunst und Medien. Der Beitrag versteht sich als Pl doyer für ein Ausbrechen aus der bitteren Ernsthaftigkeit sowie für ein Ablegen des einengenden wissenschaftlichen Sprachkorsetts. Mit der Anwendung experimenteller literarischer Techniken und Stilmittel, welche die neuzeitliche Wissenschaftsauffassung radikal vom akademischen Diskurs getrennt hat, versucht die hier vorgestellte postmoderne ethnographische Schreibweise, die soziokulturellen Konstrukte von erz hlter Realit t explizit zu machen. Im Gegensatz zum letzten tragischen Helden der Moderne, dem Intellektuellen, übernimmt der postmoderne Intellektuelle die Rolle eines Interpreten. Das hei t, er ist übersetzer, Dolmetscher, Vermittler, Kommunikator. Seine zwar bescheidene, aber anspruchsvolle Aufgabe besteht darin, Aussagen, die einem bestimmten Sinnzusammenhang entstammen, für Menschen verst ndlich zu machen, die in anderen Traditionen verwurzelt sind. Dazu verwendet er Strategien wie Witz, Ironie, Parodie und Komik. Da diese Vermittlung haupts chlich für die ffentlichkeit gemacht werden sollte – und nicht blo für einen kleinen Zirkel von Spezialisten der gleichen Professionsgruppe –, sind dabei Lesbarkeit- und Unterhaltungskriterien wichtiger als die Einhaltung strenger Validit ts- und Reliabilit tsstandards. URN: urn:nbn:de:0114-fqs010210 Jo REICHERTZ' intelligent article "On the Problem of Validity of Qualitative Research" cannot be objected to on a purely argumentative level. Therefore, the aim of this reply is less to contradict REICHERTZ but to add to his arguments a few new ones. However, within these arguments our conclusions are different: the social sciences principally do not need "models of quality assurance" but rather an opening towards aesthetics, art and media. Hence, this reply can be understood as a pledge for a break from a bitter seriousness on the one hand and for a removal of the constricting scientific language corset on the other hand. With the application of experimental literary techniques (for instance narration, reportage, c
Review Essay: Entgrenzung von Lebenssph ren? Methodisch-empirische Herausforderungen der "Postfordismus"-Debatte Review Essay: No More Separation between Paid Work and Leisure? Methodological and Empirical Challenges in the Debate about Post-Fordism Ensayo: No más separación entre trabajo pagado y ocio? Desafíos metodológicos y empíricos en el debate sobre Post-Fordism
Birgit Huber
Forum : Qualitative Social Research , 2005,
Abstract: Das besprochene Buch ist ein empirisch-kulturwissenschaftlich ausgerichte-ter Sammelband, der eine Ann herung an neo-liberale Arbeits- und Lebenswelten vornimmt. Durch die Konzentration auf lebensweltliche Gesichtspunkte werden Prognosen zum Wandel von Produktionsregimes wie die Entdeckung neu-er Arbeitskrafttypen, neuartiger Strukturierungs-prinzipien von Ge-sellschaft und konomie sowie andersartiger Ge-sellschaftstypen differenziert. Dabei verlieren sich die Autoren jedoch keinesfalls in reinen Mikrobeobachtungen – eine Schw che, die gerade den historisch informierten, empirisch arbeitenden Geschichts- und Kulturwissenschaft-lern gerne zugeschrieben wird. Es gelingt ihnen, mit Hilfe zum Teil anspruchsvoller methodischer Ans tze wie der über station r arbeitende Feldfor-schung hinausgehende "multi-sited-ethnography" die Grenzverschie-bungen zwischen Arbeits- und Lebenswelt, die im Mittelpunkt der Diskussion um die "Krise des For-dismus" stehen, empirisch zu erfassen. W hrend solche Fallstudien über-zeugen, bleiben überlegungen zum Ende der Voll-erwerbsgesellschaft oder zur Kultur der "New Eco-nomy" zu sehr in Spe-kulationen verhaftet. Ziel der Rezension ist es, eine Verortung der Artikel in die anfangs vor allem in der Regulations-theorie, inzwischen vor allem auch in der Arbeits- und Industriesoziologie geführten Diskussion um den Wandel von Produktionsregimes, vorzuneh-men. Herausgearbeitet wird, welche Diskussions-str nge in wissenschaftlicher Literatur zu identifizieren sind, die die Entgrenzung von Arbeit und Lebenswelt sowie reflexive Wieder-Begrenzungen analysieren. Von besonderem Interesse sind innovative Methodiken, die es erlauben, verschiedene Lebenssph ren empirisch gleichzeitig in den Blick zu nehmen. URN: urn:nbn:de:0114-fqs050324 This anthology reflects the spheres of working and living in a neo-liberal society from the viewpoint of cultural studies in European ethnology. Concentrating on daily life, it questions prognoses about regimes of production, new types of manpower and the rediscovery of new structures of society and economy as well as new types of societies. The book is not only about micro-studies—concentrating on micro-studies has often been criticized by both the science of history and cultural studies, which work empirically. The authors of this book work on the basis of ambitious methodological approaches such as "multi-sited-ethnography," which transgresses static fieldwork and is able to grasp the differential between paid work and leisure. These case studies are fully convincing, but reflections about the end of a societ
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