cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Pseudopanotrogus Petrovitz 1969
Creators: name: Allsopp, Peter G.
name: Schoolmeesters, Paul
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Pseudopanotrogus

description: Pseudopanotrogus Petrovitz, 1969
[13 species].
Type species Pseudopanotrogus kashmirensis Petrovitz, 1969 (= Pseudopanotrogus donckieri (Brenske, 1892)), by original designation.
description: Published as part of Allsopp, Peter G. & Schoolmeesters, Paul, 2024, All genera of the world: Subfamilies Prototroginae, Cretoscarabaeinae, Dynamopodinae, Electrorubesopsinae, Phaenomeridinae, Orphninae, Allidiostomatinae, Aclopinae, Lichniinae, Melolonthinae, Oncerinae, Podolasiinae, Sericinae, Sericoidinae (Animalia: Arthropoda: Insecta: Coleoptera: Scarabaeidae), pp. 104-175 in Megataxa 12 (1) on page 132, DOI: 10.11646/megataxa.12.1.2, http://zenodo.org/record/14984437
A comparative study of Macroscopic Fundamental Diagrams of arterial road networks governed by adaptive traffic signal systems
Creators: name: Zhang, Lele
name: Garoni, Timothy M.
name: de Gier, Jan
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cellular Automata and Lattice Gases (nlin.CG)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: Using a stochastic cellular automaton model for urban traffic flow, we study and compare Macroscopic Fundamental Diagrams (MFDs) of arterial road networks governed by different types of adaptive traffic signal systems, under various boundary conditions. In particular, we simulate realistic signal systems that include signal linking and adaptive cycle times, and compare their performance against a highly adaptive system of self-organizing traffic signals which is designed to uniformly distribute the network density. We find that for networks with time-independent boundary conditions, well-defined stationary MFDs are observed, whose shape depends on the particular signal system used, and also on the level of heterogeneity in the system. We find that the spatial heterogeneity of both density and flow provide important indicators of network performance. We also study networks with time-dependent boundary conditions, containing morning and afternoon peaks. In this case, intricate hysteresis loops are observed in the MFDs which are strongly correlated with the density heterogeneity. Our results show that the MFD of the self-organizing traffic signals lies above the MFD for the realistic systems, suggesting that by adaptively homogenizing the network density, overall better performance and higher capacity can be achieved.
description: 35 pages, 14 figures
Production and Advertising in a Dynamic Hotelling Monopoly
Creators: name: Lambertini, Luca
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2001
Subjects: SECS-P/01 Economia politica

description: I characterise the dynamics of capacity accumulation and investment in advertising in a spatial monopoly model, contrasting the socially optimal behaviour of a benevolent planner against the behaviour of a profit-maximising monopolist. I show that, in steady state, the monopolist always distorts both kinds of investment as compared to the social optimum, except in a situation where the Ramsey equilibrium prevails under both regimes.
P53 - Expression und DNS - Ploidie bei Basaliomen verschiedener Wachstumstypen
Creators: name: Wohlrab, Christiane
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2000
Subjects: Elektronische Publikation
Zsfassung in engl. Sprache

description: Das Basaliom ist mit einer jährlichen Rate von ca. 100 Neuerkrankungen pro 100.000 Einwohner der am häufigsten auftretende epitheliale Tumor der Haut. Aufgrund seiner pathobiologischen Merkmale nimmt das Basaliom eine "Mittelstellung" zwischen benignen und malignen Hauttumoren ein. Hinsichtlich der Aggressivität im Wachstumsverhalten ist bei vielen Tumoren ein Zusammenhang sowohl mit Veränderungen im Ploidiegrad als auch in der Mutation des p53-Tumorsuppressorgens bekannt. Ziel der Untersuchungen war es deshalb, das Verhalten des Ploidiestatus und der p53-Expression bei diesen semimalignen Tumoren zu bestimmen und mit dem histologischen Basaliomtyp zu vergleichen. Dazu wurden bei insgesamt 76 Basaliomen (35 solide Basaliome, 37 multilokuläre superfizielle Basaliome, 3 Ulcera rodentia, 1 Ulcus terebrans) bildzytophotometrisch das DNS-Verteilungsmuster und immunhistochemisch der p53-Nachweis durchgeführt. In 38% der Fälle konnte eine positive Immunreaktion nachgewiesen werden, während bei nur 5 Tumoren (7%) ein aneuploider DNS-Gehalt gefunden wurde. Ein direkter Zusammenhang zwischen dem immunhistochemischen Nachweis von mutiertem p53 und dem Ploidiestatus der untersuchten Basaliome, unabhängig von ihrem histologischen Typ, ließ sich nicht nachweisen. Die Ergebnisse zeigen, daß das p53-Protein eine wichtige Rolle in der Pathogenese des Basalioms spielt. Weitere Untersuchungen zur Aufklärung einer möglichen Beziehung zwischen positiver p53-Immunreaktion und p53-Genmutationen sind notwendig. So ist beispielsweise der Nachweis von p53-Mutationen in Basaliomen mittels PCR zu erwägen.
description: Basal cell carcinomas are the most frequent skin tumors with an incidence of 100 cases/100000 per year. Pathobiologically they show characteristics of benign as well as malign tumors. In various tumors a correlation between growth behaviour and either ploidy or mutations of the p53 tumor suppressor gene has been established. In the current study we, therefore, examined ploidy and p53 expression in basal cell carcinomas in comparison to the histological type of the tumor. For this purpose, the ploidy was determined by image cytometry as was p53 expression by immunohistochemistry in 76 basal cell carcinomas (35 solid tumors, 37 multilocular superficial tumors, 3 ulcera rodentia, 1 ulcus terebrans). 38% of the tumors stained positive for p53 and 7% of the tumors were aneuploid. We could not show a correlation between the mutated p53 gene product and ploidy independent of the histological type of the basal cell carcinomas examined. These results suggest an important role for p53 in the pathogenesis of basal cell carcinomas. Further studies are needed to determine the correlation between positive immunostaining for p53 and mutations of the p53 gene. It might be worth examining mutations in the p53 gene by PCR.
Extracting limits on Dark Matter annihilation from gamma-ray observations towards dwarf spheroidal galaxies
Creators: name: Cholis, Ilias
name: Salucci, Paolo
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Dwarf spheroidal galaxies compose one of the most dark matter dominated classes of objects, making them a set of targets to search for signals of dark matter annihilation. Recent developments in gamma-ray astronomy, most importantly the launch of the Fermi-LAT instrument, have brought those targets into attention. Yet, no clear excess of gamma-rays has been confirmed from these targets, resulting in some of the tightest limits on dark matter annihilation from indirect searches. In extracting limits from dwarf spheroidal galaxies, it is of great importance, to properly take into account all relevant uncertainties. Those include the dark matter distribution properties of the dwarf spheroidals and the uncertainties on the underlying background. We revisit the limits on dark matter annihilation, from gamma-rays studying a set of close-by dwarf spheroidal galaxies, for which, we have good understanding of the uncertainties in the dark matter distribution. For those targets, we perform and compare results for alternative methods in extracting the background gamma-ray flux. This provides a method to discriminate among the dark matter annihilation targets, those that can give robust constraints. We finally present our tightest limits on dark matter annihilation, that come only from the targets that ensure accurate understanding of both the gamma-ray background and the dark matter distribution uncertainties.
description: 22 pages, 12 figures, 4 tables, slight change of title. v2 agrees with the published PRD version
Dynamic Oligopoly with Sticky Prices: Closed-Loop, Feedback and Open-Loop Solutions
Creators: name: Cellini, Roberto
name: Lambertini, Luca
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2000
Subjects: SECS-P/01 Economia politica

description: We investigate a dynamic oligopoly game with price adjustments. We show that the subgame perfect equilibria are characterised by larger output and lower price levels then the open-loop solution. The individual (and industry) output at the closed-loop equilibrium is larger than its counterpart at the feedback equilibrium. Therefore, firms prefer the open-loop equilibrium to the feedback equilibrium, and the latter to the closed-loop equilibrium. The opposite applies to consumers.
On congruent primes and class numbers of imaginary quadratic fields
Creators: name: Bruin, Nils
name: Hemenway, Brett
Publisher: name: arXiv
Year: 2011
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11G05, 11R29

description: We consider the problem of determining whether a given prime p is a congruent number. We present an easily computed criterion that allows us to conclude that certain primes for which congruency was previously undecided, are in fact not congruent. As a result, we get additional information on the possible sizes of Tate-Shafarevich groups of the associated elliptic curves. We also present a related criterion for primes p such that 16 divides the class number of the imaginary quadratic field Q(sqrt(-p)). Both results are based on descent methods. While we cannot show for either criterion individually that there are infinitely many primes that satisfy it nor that there are infinitely many that do not, we do exploit a slight difference between the two to conclude that at least one of the criteria is satisfied by infinitely many primes.
description: 21 pages; changes w.r.t. version 1: some added references and minor corrections
Community and the politics of mourning in the work and world of David Wojnarowicz
Creators: name: Giffen, Sheila Jane
Publisher: name: University of British Columbia
Year: 2013

description: This thesis analyzes the writings of New York artist, David Wojnarowicz (1954-1992) and the forms of activism that were inspired by his work as sites through which to examine the contours of politics and community in late 1980s and early 1990s New York. In his collection of autobiographical essays, Close to the Knives: A Memoir of Disintegration (1991), Wojnarowicz proposes an alternative model of selfhood and confronts his own mortality, thereby disrupting the category of the bounded individual in favour of a self that is beholden to others. His text offers an ethical revelation by asking why some deaths matter more than others – more specifically, how the death of a queer man from AIDS is perceived to be less tragic than the death of a middle-class child in America. Wojnarowicz’s reflections on the politics of mourning were taken up by activists following his death in 1992. In particular, passages of his writing insisting on the need to make mourning public inspired a series of political funerals and protest actions. My project questions an argumentative logic that insists artists and activists directly refute and undermine biomedical regulation through their work. Engaging with such arguments, I advance a reading of both Wojnarowicz’s writings and the protests his work inspired that considers the difficulty of formulating acts of resistance within a biopolitical order. Wojnarowicz’s art and the public memorial actions that followed his death enable a reimagining of community and politics through mourning in the midst of the AIDS crisis. They do so by enacting an alternative model of selfhood, confronting mortality and inspiring a politicization of grief.
Kompetition zwischen MRTF und WH2-Domänen von Aktin-Nukleatoren bei der Genregulation
Creators: name: Kluge, Franziska
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2018
Subjects: subject: 572

description: Aktin reguliert die Lokalisation sowie die Aktivität von myocardin-related transcription factors (MRTFs), einer Kofaktor-Familie des serum response factors (SRF). Dabei verhindert die Bildung inhibitorischer G-Aktin:MRTF-A-Komplexe die Aktivierung der MRTF-SRF-abhängigen Transkription. WH2-Domänen aus Aktinbindeproteinen interagieren mit derselben Oberfläche des Aktinmonomers wie MRTF-A und könnten durch direkte Kompetition eine Komplexdissoziation stimulieren. In dieser Arbeit wird durch Bindungsexperimente belegt, dass MRTF-A und isolierte WH2-Domänen-Varianten aus N-WASP, WAVE2, JMY, Cobl und Spire2 direkt um die G-Aktin-Bindung konkurrieren. Immunfluoreszenzstudien, SRF-Reporterassays und qPCR-Analysen zeigten, dass überexprimierte WH2-Domänen eine Kernakkumulation von MRTF-A und die MRTF-SRF-abhängige Genexpression induzieren. Diese WH2-vermittelte Aktivierung von MRTF-A konnte polymerisationsunabhängig erfolgen und findet vermutlich überwiegend im Zytoplasma statt. Somit liefert diese Arbeit neue Erkenntnisse für eine Regulation der G-Aktin:MRTF-A-Komplexdissoziation durch WH2-Domänen-Proteine.
description: Actin regulates the localization as well as the activity of myocardin-related transcription factors (MRTFs), a cofactor family of the serum response factor (SRF). The formation of inhibitory G-actin:MRTF-A complexes prevents the activation of MRTF-SRF-dependent transcription. WH2 domains from actin binding proteins interact with the same surface of the actin monomer as MRTF-A and may thus stimulate complex dissociation by direct competition. In this work, binding experiments revealed that MRTF-A and isolated WH2 domain variants from N-WASP, WAVE2, JMY, Cobl and Spire2 compete directly for G-actin binding. Immunofluorescence studies, SRF reporter assays and qPCR analysis showed that overexpressed WH2 domains induce a nuclear accumulation of MRTF-A and MRTF-SRF-dependent gene expression. This WH2-mediated activation of MRTF-A could occur polymerization-independent and predominantly takes place in the cytoplasm. Thus, this work provides new insights for a regulation of G-actin:MRTF-A complex dissociation by WH2 domain proteins.
Numerical time propagation of quantum systems in radiation fields
Creators: name: Alvermann, A.
name: Fehske, H.
name: Littlewood, P. B.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Atoms, molecules or excitonic quasiparticles, for which excitations are induced by external radiation fields and energy is dissipated through radiative decay, are examples of driven open quantum systems. We explain the use of commutator-free exponential time-propagators for the numerical solution of the associated Schrödinger or master equations with a time-dependent Hamilton operator. These time-propagators are based on the Magnus series but avoid the computation of commutators, which makes them suitable for the efficient propagation of systems with a large number of degrees of freedom. We present an optimized fourth order propagator and demonstrate its efficiency in comparison to the direct Runge-Kutta computation. As an illustrative example we consider the parametrically driven dissipative Dicke model, for which we calculate the periodic steady state and the optical emission spectrum.
description: 23 pages, 11 figures
CAD design of an active MMIC circulator at 21-26 GHz frequency band.
Creators: name: Stratakos, George E.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1998
Subjects: ING-INF/01 Elettronica

description: In this work the design an active MMIC circulator is presented. The foundry process that has been used is the HEMT process of GEC-Marconi Materials H40 (6). The analysis of this circulator is performed using CAD techniques. Specifically the software tool HP-Eesof Series IV (5) is used throughout the design process. Simulation results are presented and a comparison between a typical ferrite circulator and this active design is performed.
Triodonyx Saylor 1942
Creators: name: Allsopp, Peter G.
name: Schoolmeesters, Paul
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Triodonyx

description: Triodonyx Saylor, 1942
[5 species].
Type species Phyllophaga gigantissima Saylor, 1935, by original designation.
description: Published as part of Allsopp, Peter G. & Schoolmeesters, Paul, 2024, All genera of the world: Subfamilies Prototroginae, Cretoscarabaeinae, Dynamopodinae, Electrorubesopsinae, Phaenomeridinae, Orphninae, Allidiostomatinae, Aclopinae, Lichniinae, Melolonthinae, Oncerinae, Podolasiinae, Sericinae, Sericoidinae (Animalia: Arthropoda: Insecta: Coleoptera: Scarabaeidae), pp. 104-175 in Megataxa 12 (1) on page 132, DOI: 10.11646/megataxa.12.1.2, http://zenodo.org/record/14984437
Scaling non linear models for low gm MESFETS
Creators: name: Cordeiro, Jean-Philippe
name: Costa Freire, J.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1998
Subjects: ING-INF/01 Elettronica

description: A new technique to scale down non linear Models for small gate width MESFETs is presented. The model is obtained from a larger device model scaled only on the total gate width and adjusting two DC parameters and three AC parameters to the measurements on typical small devices. The advantage of this model over classical scaling techniques is shown not only at the device level but also on the simulation of an active Voltage Controlled Reactance.
Who Gave you the Cauchy-Weierstrass Tale? The Dual History of Rigorous Calculus
Creators: name: Borovik, Alexandre
name: Katz, Mikhail G.
Publisher: name: arXiv
Year: 2011
Subjects: subject: History and Overview (math.HO)
subject: Classical Analysis and ODEs (math.CA)
subject: Functional Analysis (math.FA)
subject: Logic (math.LO)
subject: FOS: Mathematics
subject: 01A85, 26E35, 03A05, 97A20, 97C30

description: Cauchy's contribution to the foundations of analysis is often viewed through the lens of developments that occurred some decades later, namely the formalisation of analysis on the basis of the epsilon-delta doctrine in the context of an Archimedean continuum. What does one see if one refrains from viewing Cauchy as if he had read Weierstrass already? One sees, with Felix Klein, a parallel thread for the development of analysis, in the context of an infinitesimal-enriched continuum. One sees, with Emile Borel, the seeds of the theory of rates of growth of functions as developed by Paul du Bois-Reymond. One sees, with E. G. Bjorling, an infinitesimal definition of the criterion of uniform convergence. Cauchy's foundational stance is hereby reconsidered.
description: 47 pages, 3 figures; Foundations of Science 17 (2012), no. 3, 245-276
Positive feedback GaAs comparators for SDH/SONET applications
Creators: name: Trifiletti, A.
name: Centurelli, F.
name: Tommasino, P.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1998
Subjects: ING-INF/01 Elettronica

description: In this paper we present two topologies for differential high-sensitivity comparators, suitable to be implemented in GaAs MESFET/HEMT technologies. Both topologies use positive feedback to compensate for the moderate specific transconductance of GaAs devices, and differ for the implementation of the summation node. The linear and non-linear behaviour of the circuits are analysed, in order to define limitations due to process parametric dispersion using state of art technologies. Circuit simulations are reported to estimate slew rate performance. The topology based on the cascade of two differential cells shows better slew rate performance and results not very sensitive to process parameter dispersion, whereas the topology based on the shunt connection of two differential pairs is more sensitive to process variations but allows to electronically control its DC transfer function.
BRST Analysis of Physical Fields and States for 4D Quantum Gravity on R x S^3
Creators: name: Hamada, Ken-ji
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We consider the background-free quantum gravity based on conformal gravity with the Riegert-Wess-Zumino action, which is formulated in terms of a conformal field theory. Employing the $R \times S^3$ background in practice, we construct the nilpotent BRST operator imposing diffeomorphism invariance. Physical fields and states are analyzed, which are given only by real primary scalars with a definite conformal weight. With attention to the presence of background charges, various significant properties, such as the state-operator correspondence and the norm structure, are clarified with some examples.
description: 29 pages, several descriptions written using CFT terminology are added
A full alternative for the RTD quantum-inductance equivalent-circuit model
Creators: name: Kwaspen, J.J.M.
name: Lepsa, M.I.
name: Van De Roer, Th. G.
name: Heyker, H.C.
name: Van Der Vleuten, W.C.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1998
Subjects: ING-INF/01 Elettronica

description: Under specific conditions, the small-signal series/parallel double-RC equivalent-network is a novel full mutual alternative for the resonant tunnelling diode quantum-inductance circuit model. Network optimisations to accurately match measured intrinsic impedances of stable, non-oscillating GaAs/AlAs devices, pointed at these conditions. The capacitance Cw of the series-RC branch, peaks needle-sharp at the negative dynamic conductance "maximum, indicating carrier  discharge   from   the   quantum   well.   The  Rb Cw -time   constant equals   Lq Gd of  the quantum-inductance model, so it is also an indication of the quasibound-state lifetime in the well. For CAD purposes, a very good RTD intrinsic impedance description in the entire bias/frequency space (0-2 V; 0.05-40.05 GHz) is obtained with frequency-independent intrinsic elements, scalable with device area.
Xanthotrogus Reitter 1902
Creators: name: Allsopp, Peter G.
name: Schoolmeesters, Paul
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Xanthotrogus

description: Xanthotrogus Reitter,1902,as Rhizotrogus (Xanthotrogus)
[10 species].
Type species Rhizotrogus sieversi Reitter, 1896, by subsequent designation of Medvedev (1951).
Status revised to Xanthotrogus by Medvedev (1966).
Xanthotrogus (Xestotrogus) Reitter, 1902, as Rhizotrogus (Xestotrogus).
Type species Rhizotrogus validus Kraatz, 1884, by monotypy.
Status revised to Xanthotrogus (Xestotrogus) by Nikolajev (2004c).
description: Published as part of Allsopp, Peter G. & Schoolmeesters, Paul, 2024, All genera of the world: Subfamilies Prototroginae, Cretoscarabaeinae, Dynamopodinae, Electrorubesopsinae, Phaenomeridinae, Orphninae, Allidiostomatinae, Aclopinae, Lichniinae, Melolonthinae, Oncerinae, Podolasiinae, Sericinae, Sericoidinae (Animalia: Arthropoda: Insecta: Coleoptera: Scarabaeidae), pp. 104-175 in Megataxa 12 (1) on page 132, DOI: 10.11646/megataxa.12.1.2, http://zenodo.org/record/14984437
Magnetic moment of an electron near a surface with dispersion
Creators: name: Bennett, Robert
name: Eberlein, Claudia
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Boundary-dependent radiative corrections that modify the magnetic moment of an electron near a dielectric or conducting surface are investigated. Normal-mode quantization of the electromagnetic field and perturbation theory applied to the Dirac equation for a charged particle in a weak magnetic field yields a general formula for the magnetic moment correction in terms of any choice of electromagnetic mode functions. For two particular models, a non-dispersive dielectric and an undamped plasma, it is shown that, by using contour integration techniques over a complex wave vector, this can be simplified to a formula featuring just integrals over TE and TM reflection coefficients of the surface. Analysing the magnetic moment correction for several models of surfaces, we obtain markedly different results from the previously considered simplistic `perfect reflector' model, which is due to the inclusion of physically important features of the surface like evanescent field modes and dispersion in the material. Remarkably, for a general dispersive dielectric surface, the magnetic moment correction of an electron nearby has a peak whose position and height can be tuned by choice of material parameters.
description: 5 pages, 1 figure
Electromagnetic model of GaAs VCSEL'S with gain giuding
Creators: name: Bava, G.P.
name: Debernardi, P.
name: Fratta, L.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1998
Subjects: ING-INF/01 Elettronica

description: An electromagnetic model of Vertical Cavity Surface Emitting Lasers (VCSEL) based on semiconductor compounds is developed; it relies on the rigorous solution of Maxwell equations, including the field confinement due to the gain guiding mechanism which strongly influences the noise properties. The solution of the problem is based on an integral equation of the Fredholm type whose eigenvalues are related to the threshold condition and eigenvectors give the field distributions.
Synthese und Glycosidase-Inhibitoreigenschaften von Calysteginen
Creators: name: Reißmann, Stefan
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2006
Subjects: Elektronische Publikation
Hochschulschrift
Online-Publikation
Zsfassung in engl. Sprache

description: Da Glycosidasen an einer Vielzahl wichtiger biologischer Prozesse, wie der Verdauung, der post-translativen Transformation von Glycoproteinen und dem lysosomalen Katabolismus von Glycokonjugaten, beteiligt sind, verfügen Glycosidase-Inhibitoren über ein enormes therapeutisches Potential bei der Behandlung von Diabetes, Krebs, SL-Speicherkrankheiten und weiteren Krankheiten, bei denen diese Prozesse gestört sind. Somit besteht ein beson- deres Interesse an der Entwicklung neuer, nicht-toxischer Glycosidase-Inhibitoren. Gegenstand der vorliegenden Arbeit ist die enantioselektive Synthese der Calystegine B2, B3, B4, A7, 3-Desoxy-3-fluor-B2 und 3-epi-B2 sowie die Quantifizierung ihrer Fähigkeit Glycosidasen zu inhibieren. Ein in der Arbeitsgruppe Csuk entwickelter High-Throughput-Screening-Absorptionsassay für Mikrotiterplatten ermöglichte erstmals die Quantifizierung der Glycosidase-Inhibitor-Aktivitäten der synthetisierten Calystegine, wobei sich die Calystegine B2, B4 und 3-Desoxy-3-fluor-B2 als starke β-Glucosidase-Hemmer erwiesen.
description: Glycosidases are involved in a variety of important biological processes, such as intestinal digestion, post-translational processing of glycoproteins and the lysosomal catabolism of glycoconjugates. Therefore glycosidase inhibitors might have an enormous therapeutical potential in the treatment of many diseases like diabetes, cancer, glycosphingolipid storage diseases or viral infections. Most of these negative effects can be shown to result from direct or indirect inhibition of glycosidases. So there is a special interest and demand in the development of new non-toxic glycosidase-inhibitors. Main issue of this work is the enantioselective synthesis of the calystegines B2, B3, B4, A7, 3-Deoxy-3-fluor-B2 and 3-epi-B2 including the quantification of their glycosidase-inhibitor-abilities using a recentyl developed high-throughput-screening-absorptionassay.
A fully CAD consistent model of MESFETs and HEMTs
Creators: name: Valkov, Stéphane
name: Pouvil, Pierre
name: Temcamani, Farid
name: Leblanc, Rémy
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1998
Subjects: ING-INF/01 Elettronica

description: An empirical large-signal model of MESFETs and HEMTs has been developed which ensures the full charge conservation, numerical stability and small-signal consistency during computer-aided simulations. For a maximum of accuracy, the charges are directly extracted from the raw gradient experimental data and represented by optimized polynomial functions. The model is valid in reverse operation of the device too. It has been verified for a 0.5 un gate length, 2 x 50 um and 4 x 50 um gate width PHEMTs and implemented into the Hewlett-Packard's MDS software.
New method for determining parasitic access inductances of high frequency on-wafer coplanar heterojunction bipolar transistors
Creators: name: Ouslimani, A.
name: Gaubert, J.
name: Hafdallah, H.
name: Birafane, A.
name: Pouvil, P.
name: Leier, H.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1998
Subjects: ING-INF/01 Elettronica

description: New analytical extraction procedure is developed for determining independently the parasitic inductances of high frequency on-wafer coplanar Heterojunction Bipolar Transistor. It takes into account the influence of inductive effect due to other device parameters which can not be neglected for these transistors and it does not require any numerical optimizations or special test structures. In particular the analytical expressions demonstrate that base resistance and intrinsic and extrinsic base-collector capacitances have a significant effect on the accurate determination of the HBT parasitic inductances. Our theoretical investigations are validated using two types of transistors: A on-wafer coplanar GalnP/GaAs HBT and a microstrip mounted GalnP/GaAs which have a unity current gain cutoff frequency of 80 GHz respectively.
A new FET extrinsic parameter extraction method at pinch-off bias utilizing gate-width scaling property
Creators: name: Kim, Dae-Hyun
name: Yang, Sung-Gi
name: Ryu, Gi-Hyon
name: Seo, Kwang-Seok
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1998
Subjects: ING-INF/01 Elettronica

description: A new FET extrinsic parameter extraction method is proposed, in which all the extrinsic elements can be determined directly from the S-parameters at pinch-off bias. It utilizes the measurement data of various gate-width FET's and the simple scaling property of each equivalent circuit parameters, eliminating some complex measurement steps such as forward gate bias measurement. Since the gate-width scaling characteristics are taken into account, the proposed method can be utilized for the MMIC design where the optimization of the FET gate-width is important. The proposed method was successfully applied to the modeling of 0.25 um GaAs P-HEMT.
New large signal electrothermal HBT model with original parameters extraction procedure
Creators: name: Gaubert, J.
name: Ouslimani, A.
name: Hafdallah, H.
name: Medjnoun, M.
name: Birafane, A.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1998
Subjects: ING-INF/01 Elettronica

description: A new large signal electrothermal Heterojunction Bipolar Transistor (HBT) model with original parameters extraction procedure is reported. The model, which is implemented in Hewlett-Packard MDS software, is based on a physical description and includes the high order effects of HBT operation. The extraction process requires only conventional DC and microwave measurements and does not need any numerical optimisations. In order to demonstrate the accuracy of the model, simulations performed without convergence problems are compared to measurements data for a 2x30um2 GaInP/GaAS HBT.
Sophrops Fairmaire 1887
Creators: name: Allsopp, Peter G.
name: Schoolmeesters, Paul
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Sophrops

description: Sophrops Fairmaire, 1887a
[117 species and 4 additional subspecies].
Type species Sophrops parviceps Fairmaire, 1887, by monotypy.
Microtrichia Brenske, 1900a.
Type species Microtrichia puttalama Brenske, 1900 (= Sophrops costatus (Walker, 1859)), by subsequent designation of Nomura & Kobayashi (1979).
Synonymy by Arrow (1946a).
Holotrichia (Eretusa) Reitter, 1902.
Type species Ancylonycha nigra Redtenbacher, 1868 (= Sophrops planicollis (Burmeister, 1855)), by monotypy.
Synonymy by Matsumoto (2015).
Holotrichia (Noanda) Reitter, 1902.
Type species Holotrichia standfussi Brenske, 1892, by monotypy.
Synonymy by Matsumoto (2015).
description: Published as part of Allsopp, Peter G. & Schoolmeesters, Paul, 2024, All genera of the world: Subfamilies Prototroginae, Cretoscarabaeinae, Dynamopodinae, Electrorubesopsinae, Phaenomeridinae, Orphninae, Allidiostomatinae, Aclopinae, Lichniinae, Melolonthinae, Oncerinae, Podolasiinae, Sericinae, Sericoidinae (Animalia: Arthropoda: Insecta: Coleoptera: Scarabaeidae), pp. 104-175 in Megataxa 12 (1) on page 132, DOI: 10.11646/megataxa.12.1.2, http://zenodo.org/record/14984437
Dynamical invariants for quantum control of four-level systems
Creators: name: Güngördü, Utkan
name: Wan, Yidun
name: Fasihi, Mohammad Ali
name: Nakahara, Mikio
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We present a Lie-algebraic classification and detailed construction of the dynamical invariants, also known as Lewis-Riesenfeld invariants, of the four-level systems including two-qubit systems which are most relevant and sufficiently general for quantum control and computation. These invariants not only solve the time-dependent Schrödinger equation of four-level systems exactly but also enable the control, and hence quantum computation based on which, of four-level systems fast and beyond adiabatic regimes.
description: 11 pages, 5 tables
Tariffs vs Quotas in a Model of Trade with Capital Accumulation
Creators: name: Calzolari, Giacomo
name: Lambertini, Luca
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2000
Subjects: SECS-P/01 Economia politica

description: This paper examines the equivalence among price-modifying and quantity fixing international trade policies in a differential game. We employ two well known capital accumulation dynamics for firms, due to Nerlove and Arrow and to Ramsey, respectively. We show that, in both cases, open-loop and closed-loop Nash equilibria coincide. Under the former accumulation the tariff-quota equivalence holds, but it does not under the latter. Moreover, in the Ramsey model, the country setting the trade policy prefers a quantity-equivalent import quota to the adoption of the tariff.
Hybridization in western trout : spatial variation and the role of environmental factors
Creators: name: Yau, Monica M.
Publisher: name: University of British Columbia
Year: 2013

description: Hybridization and introgression with non-native salmonids is one of the greatest factors threatening native cutthroat trout species. Westslope cutthroat trout (Oncorhynchus clarkii lewisi; WSCT) were recently listed under the Canadian Species at Risk Act (SARA) as "special concern" (British Columbia populations) and "threatened" (Alberta populations). I employed a 10 locus-microsatellite DNA assay to investigate levels of hybridization between westslope cutthroat trout and introduced rainbow trout (O. mykiss; RT) at 159 sampling locations in southwestern Alberta and parts of southeastern British Columbia. My results revealed that hybridization is extensive across the region sampled. Admixture levels (qwsct of 0 = pure rainbow trout, 1.0 = pure westslope cutthroat trout) at sampling locations ranged from 0.01 to 0.99. An average qwsct below 0.99 is a criterion that has been used in previous work to designate a population as "hybridized." Landscape genetic analysis using regression trees indicate that water temperature, elevation, distance to the nearest stocking site and distance to the nearest railway were significant components of a model that described 34% of the variation in qwsct across 58 sites for which habitat variables were available. Building on this finding, I explored the role of water temperature, the best predictor of hybridization levels amongst the variables tested, in limiting the spread of admixture by evaluating cold tolerance in both species using critical thermal methods (CTM). Analysis of variance revealed a statistically significant difference between the critical thermal minima (CTMin) of WSCT and RT acclimated to 15 °C (1.0 ± 0.8 °C and 1.4 ± 1.0 °C respectively). The heritability of cold tolerance observed in this study appears to be complex and does not seem to behave in a simple additive manner. The identification of water temperature as a major factor influencing admixture and subsequent test for physiological differences in cold tolerance provide evidence to support a hypothesis that cold water habitats act as a natural barrier to hybridization between WSCT and RT. This information provides insight into the evolutionary history of WSCT and RT and will be useful in assisting conservation efforts aimed at mitigating the wide-spread loss of WSCT to genomic extinction.
The Monopolist’s Optimal R&D Portfolio
Creators: name: Lambertini, Luca
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2000
Subjects: SECS-P/01 Economia politica

description: The monopolist’s incentives towards product and process innovations are evaluated against the social optimum. The main findings are that (i) the incentive to invest in cost-reducing R&D is inversely related to the number of varieties being supplied at equilibrium, under both regimes; (ii) distortions obtain under monopoly, w.r.t. both the number of varieties and the technology. With substitutes (respectively, complements), the monopolist’s product range is smaller (respectively, larger) than under social planning. For any given number of goods, the monopolist operates at a higher marginal cost than the planner does.
Continual Model of Medium IV: Calculation of analytical gradients for solvation energy over atomic coordinates
Creators: name: Kupervasser, Oleg
name: Wanner, N. E.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: In the given paper we describe methods finding analytical gradients (derivatives) of solvation energy over atomic coordinates. It is made both for not polar energy and for the polar energy found by methods PCM, COSMO and SGB. These gradients are searched with use of analytical gradients of parameters (coordinates, normal vectors and squares) the surface meshes. The surface meshes are located on both the optimal smooth molecular surfaces: solvent excluded surface (SES) and surface solvent accessible surface (SAS) received from SES. These surfaces are found by methods of primary and secondary rolling according to the algorithm described in the previous papers of the series.
description: 26 pages, 4 figures, paper in English and in Russian
Size distribution and anti-trust
Creators: name: Lambertini, Luca
name: Sasaki, Dan
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2000
Subjects: SECS-P/01 Economia politica

description: Extensive literature notwithstanding, effects of the size distribution of firms on consumers’ surplus and on social welfare leaves room for further exploration. In this paper we discover that size distribution imposes two counter-balancing effects on aggregate surplus of the industry : [i] even distribution of firm sizes typically facilitates tacit collusion compared to slightly uneven distribution, whilst [ii] very uneven distribution resembles monopoly. The trade-off between these two counterforces can make the overall welfare effect of firms’ size distribution (given a fixed number of firms) non-monotone in the degree of concentration.
Siamophylla Keith 2005
Creators: name: Allsopp, Peter G.
name: Schoolmeesters, Paul
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Siamophylla

description: Siamophylla Keith, 2005b
[1 species].
Type species Siamophylla grootaerti Keith, 2005, by original designation.
description: Published as part of Allsopp, Peter G. & Schoolmeesters, Paul, 2024, All genera of the world: Subfamilies Prototroginae, Cretoscarabaeinae, Dynamopodinae, Electrorubesopsinae, Phaenomeridinae, Orphninae, Allidiostomatinae, Aclopinae, Lichniinae, Melolonthinae, Oncerinae, Podolasiinae, Sericinae, Sericoidinae (Animalia: Arthropoda: Insecta: Coleoptera: Scarabaeidae), pp. 104-175 in Megataxa 12 (1) on page 132, DOI: 10.11646/megataxa.12.1.2, http://zenodo.org/record/14984437
The properties of dynamically ejected runaway and hyper-runaway stars
Creators: name: Perets, Hagai B.
name: Subr, Ladislav
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Runaway stars are stars observed to have large peculiar velocities. Two mechanisms are thought to contribute to the ejection of runaway stars, both involve binarity (or higher multiplicity). In the binary supernova scenario a runaway star receives its velocity when its binary massive companion explodes as a supernova (SN). In the alternative dynamical ejection scenario, runaway stars are formed through gravitational interactions between stars and binaries in dense, compact clusters or cluster cores. Here we study the ejection scenario. We make use of extensive N-body simulations of massive clusters, as well as analytic arguments, in order to to characterize the expected ejection velocity distribution of runaways stars. We find the ejection velocity distribution of the fastest runaways (>~80 km s^-1) depends on the binary distribution in the cluster, consistent with our analytic toy model, whereas the distribution of lower velocity runaways appears independent of the binaries properties. For a realistic log constant distribution of binary separations, we find the velocity distribution to follow a simple power law; Gamma(v) goes like v^(-8/3) for the high velocity runaways and v^(-3/2) for the low velocity ones. We calculate the total expected ejection rates of runaway stars from our simulated massive clusters and explore their mass function and their binarity. The mass function of runaway stars is biased towards high masses, and depends strongly on their velocity. The binarity of runaways is a decreasing function of their ejection velocity, with no binaries expected to be ejected with v>150 km s^-1. We also find that hyper-runaways with velocities of hundreds of km s^-1 can be dynamically ejected from stellar clusters, but only at very low rates, which cannot account for a significant fraction of the observed population of hyper-velocity stars in the Galactic halo.
description: Now matching published ApJ version
Price vs Quantity in a Duopoly with Technological Spillovers: A Welfare Re-Appraisal
Creators: name: Lambertini, Luca
name: Mantovani, Andrea
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2000
Subjects: SECS-P/01 Economia politica

description: We analyse the problem of the choice of the market variable in a model where firms activate R&D investments for process innovation. We establish that (i) firms always choose the Cournot behaviour; and (ii) there exists a set of the relevant parameters where a benevolent social planner prefers quantity setting to price setting. This happens when the marginal cost of R&D activities is relatively low while technological externalities are relatively high. In this situation, the conflict between social and private preferences over the type of market behaviour disappears.
Spin-orbit couplings between distant electrons trapped individually on liquid helium
Creators: name: Zhang, Miao
name: Wei, L. F.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We propose an approach to entangle spins of electrons floating on liquid helium by coherently manipulating their spin-orbit interactions. The configuration consists of single electrons, confined individually on liquid helium by the microelectrodes, moving along the surface as the harmonic oscillators. It has been known that the spin of an electron could be coupled to its orbit (i.e., the vibrational motion) by properly applying a magnetic field. Based on this single electron spin-orbit coupling, here we show that a Jaynes-Cummings (JC) type interaction between the spin of an electron and the orbit of another electron at a distance could be realized via the strong Coulomb interaction between the electrons. Consequently, the proposed JC interaction could be utilized to realize a strong orbit-mediated spin-spin coupling and implement the desirable quantum information processing between the distant electrons trapped individually on liquid helium.
description: 12 pages, 4 figures
Correlations between molecular architecture, morphology and deformation behaviour of Styrene/Butadiene block copolymers and blends
Creators: name: Adhikari, Rameshwar
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2001
Subjects: Hochschulschrift
Elektronische Publikation
Zsfassung in dt. Sprache

description: Die Morphologie und das Deformationsverhalten von Styrol/Butadien-Blockcopolymeren mit unterschiedlicher molekularer Architektur wurden untersucht. Dabei wurde festgestellt, dass die molekulare Architektur der unsymmetrischen Styrol/Butadien-Blockcopolymere einen starken Einfluss auf das Phasenverhalten, die Morphologieausbildung und damit die mechanischen Eigenschaften ausübt. Daraus folgend eröffnet sich über die Modifikation der Architektur ein neuer Weg zur Herstellung von Blockcopolymeren mit maßgeschneiderten mechanischen Eigenschaften. Weiterhin wurde der Einfluss der Morphologie auf die mikromechanischen Deformationsmechanismen und das makroskopische mechanische Verhalten von Blockcopolymer/Homopolystyrol-Blends und Blends aus unterschiedlichen Blockcopolymeren untersucht. Eine besondere Bedeutung besitzt hierbei der Mechanismus des Dünnschichtfließens (Thin-Layer-Yielding), der als alternativer zähigkeitssteigernder Mechanismus in spröden Polymeren auftritt. Binäre nanophasenseparierte Blockcopolymer-Blends ermöglichen es, optisch transparente, thermoplastisch verarbeitbare und hochschlagzähe Polymerwerkstoffe herzustellen.
description: The morphology and the deformation behaviour of styrene/butadiene block copolymers with different molecular architectures were investigated. Molecular architecture of the asymmetric styrene/butadiene block copolymers was found to exercise a dramatic influence on their phase behaviour, morphology formation and mechanical properties. Hence, architectural modification may provide a novel route to develop block copolymers with tailored mechanical properties. Furthermore, impact of morphology on micromechanical and mechanical behaviour of the block copolymer/homopolystyrene blends and binary block copolymer blends were investigated. In particular, ‘thin layer yielding’ mechanism observed in lamellar block copolymers having modified architecture may be used as an alternative toughening mechanism in brittle polymers. The results demonstrate that binary block copolymer blends may offer an unique possibility of producing toughened, transparent and thermoplastically processable materials on the basis of nanophase separated structures.