cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A Novel Approach in Constraining Electron Spectra in Blazar Jets: The Case of Markarian 421
Creators: name: Ushio, M.
name: Stawarz, L.
name: Takahashi, T.
name: Paneque, D.
name: Madejski, G.
name: Hayashida, M.
name: Kataoka, J.
name: Tanaka, Y. T.
name: Tanaka, T.
name: Ostrowski, M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We report results from the observations of the well studied TeV blazar Mrk 421 with the Swift and the Suzaku satellites in December 2008. During the observation, Mrk 421 was found in a relatively low activity state, with the corresponding 2-10 keV flux of $3 \times 10^{-10}$ erg/s/cm^2. For the purpose of robust constraining the UV-to-X-ray emission continuum we selected only the data corresponding to truly simultaneous time intervals between Swift and Suzaku, allowing us to obtain a good-quality, broad-band spectrum despite a modest length (0.6 ksec) exposure. We analyzed the spectrum with the parametric forward-fitting SYNCHROTRON model implemented in XSPEC assuming two different representations of the underlying electron energy distribution, both well motivated by the current particle acceleration models: a power-law distribution above the minimum energy $γ_{\rm min}$ with an exponential cutoff at the maximum energy $γ_{\rm max}$, and a modified ultra-relativistic Maxwellian with an equilibrium energy $γ_{\rm eq}$. We found that the latter implies unlikely physical conditions within the blazar zone of Mrk 421. On the other hand, the exponentially moderated power-law electron distribution gives two possible sets of the model parameters: (i) flat spectrum $dN'_e/dγ\propto γ^{-1.91}$ with low minimum electron energy $γ_{\rm min}<10^3$, and (ii) steep spectrum $\propto γ^{-2.77}$ with high minimum electron energy $γ_{\rm min}\simeq 2\times10^4$. We discuss different interpretations of both possibilities in the context of a diffusive acceleration of electrons at relativistic, sub- or superluminal shocks. We also comment on how exactly the gamma-ray data can be used to discriminate between the proposed different scenarios.
description: 18 pages, 2 figures; accepted for publication in the Astrophysical Journal
The Carbon Content of Intergalactic Gas at z=4.25 and its Evolution Toward z=2.4
Creators: name: Simcoe, Robert A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: This paper presents ionization-corrected measurements of the carbon abundance in intergalactic gas at 4.0 < z < 4.5, using spectra of three bright quasars obtained with the MIKE spectrograph on Magellan. By measuring the CIV strength in a sample of 131 discrete HI-selected quasar absorbers with ρ/\barρ>1.6, we derive a median carbon abundance of [C/H]=-3.55, with lognormal scatter of approximately ~0.8 dex. This median value is a factor of two to three lower than similar measurements made at z~2.4 using CIV and OVI. The strength of evolution is modestly dependent on the choice of UV background spectrum used to make ionization corrections, although our detection of an abundance evolution is generally robust with respect to this model uncertainty. We present a framework for analyzing the effects of spatial fluctuations in the UV ionizing background at frequencies relevant for CIV production. We also explore the effects of reduced flux between 3-4 Rydbergs (as from HeII Lyman series absorption) on our abundance estimates. At HeII line absorption levels similar to published estimates the effects are very small, although a larger optical depth could reduce the strength of the abundance evolution. Our results imply that ~50% of the heavy elements seen in the IGM at z~2.4 were deposited in the 1.3 Gyr between z~4.3 and z~2.4. The total implied mass flux of carbon into the Lyman alpha forest would constitute ~30% of the IMF-weighted carbon yield from known star forming populations over this period.
description: Accepted for publication in the Astrophysical Journal. 23 pages, 24 figures, 2 tables
Triamyxa coprolithica Qvarnström & Fikáček & Vikberg Wernström & Huld & Beutel & Arriaga-Varela & Ahlberg & Niedźwiedzki 2021, gen. et sp. nov.
Creators: name: Qvarnström, Martin
name: Fikáček, Martin
name: Vikberg Wernström, Joel
name: Huld, Sigrid
name: Beutel, Rolf G.
name: Arriaga-Varela, Emmanuel
name: Ahlberg, Per E.
name: Niedźwiedzki, Grzegorz
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Hydroscaphidae
Triamyxa
Triamyxa coprolithica

description: Triamyxa coprolithica gen. et sp. nov. Type species of the genus
description: Published as part of Qvarnström, Martin, Fikáček, Martin, Vikberg Wernström, Joel, Huld, Sigrid, Beutel, Rolf G., Arriaga-Varela, Emmanuel, Ahlberg, Per E. & Niedźwiedzki, Grzegorz, 2021, Exceptionally preserved beetles in a Triassic coprolite of putative dinosauriform origin, pp. 1-8 in Current Biology 31 on page 5, DOI: 10.1016/j.cub.2021.05.015, http://zenodo.org/record/5061134
High refractive index composite materials for THz waveguides: trade-off between index contrast and absorption loss
Creators: name: Ung, Bora
name: Dupuis, Alexandre
name: Stoeffler, Karen
name: Dubois, Charles
name: Skorobogatiy, Maksim
Publisher: name: arXiv
Year: 2010
Subjects: subject: Optics (physics.optics)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Polymer compounds from titania-doped polyethylene are fabricated and their linear optical properties characterized by THz-TDS. We show that high concentration of dopants not only enhances the refractive index of the composite material, but also can dramatically raise its absorption coefficient. We demonstrate that the design of Bragg reflectors based on lossy composite polymers depends on finding a compromise between index contrast and corresponding losses. A small absorption value is also shown to be favorable, compared to an ideal lossless reflector, as it enables to smooth the transmission passbands. Transmission measurements of a fabricated hollowcore Bragg fiber confirm simulation results.
Vom plötzlichen Boom der Gruppenarbeit in deutschen Automobilfabriken - Hintergründe und Perspektiven neuer Formen der Arbeitsorganisation
Creators: name: Endres, Egon
name: Wehner, Theo
Publisher: name: TUHH Universitätsbibliothek
Year: 1993
Subjects: subject: Gruppenarbeitskonzept
subject: 85.50:Personalwirtschaft, Arbeitsökonomik: Allgemeines
subject: 85.35:Fertigung
subject: 85.09:Unternehmensorganisation
subject: Teamwork
subject: Kraftfahrzeugindustrie
subject: 85.09
subject: 85.35
subject: 85.50
subject: 330

description: Gruppenarbeitskonzepte erfahren seit geraumer Zeit einen besonderen Boom in der Automobilindustrie, genau jener Branche, in der man dies am wenigsten vermuten würde. Dort werden insbesondere in der Produktion bei jeder Umstellung und bei jedem Modellanlauf Gruppenarbeitsplätze eingerichtet. Manager der Bereiche Fertigung, Personal und Materialwirtschaft, Betriebsräte, Gewerkschaftsvertreter und viele andere Akteure scheinen in ungewohnter Weise an einem Strick zu ziehen. Von den sogenannten neuen Formen der Arbeitsorganisation versprechen sie sich in bemerkenswertem Ausmaß die Lösung vieler drängender Probleme; freilich jeweils aus verschiedenem Blickwinkel mit unterschiedlicher Zielsetzung. Im folgenden soll gezeigt werden, daß es bei der gegenwärtigen Gruppenarbeitsdebatte keine Stunde Null gibt, sondern in vielfältiger, wenn auch wenig offenkundiger Weise an frühere Konzepte und Erfahrungen angeknüpft wird. Deshalb werden frühere und gegenwärtige Gruppenarbeitsmodelle danach befragt, warum sie entstanden sind, inwieweit sie an (sozial-)wissenschaftliche Konzepte anknüpfen, inwieweit die Modelle erfolgreich waren bzw. sind und welche Konsequenzen sich aus ihnen ableiten lassen. Aktuelle Gruppenarbeitsprojekte werden daraufhin analysiert, welche unterschiedlichen Interessen an sie gerichtet sind, wieweit die Gemeinsamkeiten gerade zwischen Management und Betriebsräten reichen und in welchem Verhältnis die Modelle zu schwedischen und japanischen Produktionskonzepten stehen. Darüber hinaus wird gefragt, inwieweit in den 90er Jahren ein Abschied vom Fließband zu erwarten ist. Abschließend wird untersucht, zu welchen Problemfeldern der Gruppenarbeit bereits Befunde aus der Gruppenforschung (Psychologie und Soziologie) vorliegen.
Effect of cosmic ray/X-ray ionization on supermassive black hole formation
Creators: name: Inayoshi, Kohei
name: Omukai, Kazuyuki
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We study effects of external ionization by cosmic rays (CRs) and X-rays on the thermal evolution of primordial clouds under strong far-ultraviolet (FUV) radiation. A strong FUV radiation dissociates H2 and quenches its cooling. Even in such an environment, a massive cloud with Tvir>10^4 K can contract isothermally at 8000 K by Lyman alpha cooling. This cloud collapses monolithically without fragmentation, and a supermassive star (>10^5 Msun) is believed to form at the center, which eventually evolves to a supermassive black hole (SMBH). However, candidates of FUV sources, including star-forming galaxies, are probably sources of strong CRs and X-rays, as well. We find that the external ionization promotes H2 production and elevates the threshold FUV intensity Jcr needed for the SMBH formation for CR energy density U_CR>10^-14 erg/cm^3 or X-ray intensity J_X>10^-24 erg/s/cm^2/sr/Hz at 1 keV. The critical FUV flux increases in proportion to U_CR^{1/2} (J_X^{1/2}) in the high CR (X-ray, respectively) limit. With the same value of FUV intensity at the Lyman limit (13.6 eV), the H^- photodissociation rate, with threshold of 0.755 eV, increases and the H2 molecules decrease with decreasing effective temperature of the FUV sources T*. The lower value of T* thus results in the lower critical FUV flux at 13.6 eV. Using an empirical relation between intensities of FUV and CR/X-ray from nearby star-forming galaxies, we find that external ionization effect remarkably enhances the critical FUV flux for sources with T* as high as 10^5 K and composed of stars with <100 Msun to a level that is not realized in any halo. This indicates that, to induce SMBH formation, the FUV sources must be either Pop II/I galaxies with low brightness temperature, Pop III galaxies with a very top-heavy IMF, or Pop III galaxies too young to harbor sources of CR/X-ray, e.g., supernova remnants or high-mass X-ray binaries.
description: 14 pages, 8 figures, 2 tables, accepted for publication in MNRAS
Probleme in der Reorganisation der zwischenbetrieblichen Arbeitsteilung: Kooperation zwischen Endherstellern und Lieferanten in der deutschen Automobilindustrie
Creators: name: Endres, Egon
name: Wehner, Theo
Publisher: name: TUHH Universitätsbibliothek
Year: 1993
Subjects: subject: 85.09:Unternehmensorganisation
subject: 85.35:Fertigung
subject: Kraftfahrzeugindustrie / Zulieferindustrie
subject: Unternehmenskooperation
subject: 85.09
subject: 85.35
subject: 330

description: Als entscheidende Ressource für die Bewältigung der komplexen Produktions- und Marktgeschehnisse wird nunmehr an erster Stelle der Mensch gesehen. Den menschbezogenen Funktionen, die in der Vergangenheit eher als unberechenbare Störgrößen angesehen wurden, schreibt der größte Teil der deutschen Automobilmanager plötzlich die Fähigkeit zu, Probleme und Störungen am flexibelsten bewältigen zu können. Das besondere Augenmerk gilt jedoch nicht dem Arbeiten Einzelner, sondern dem Zusammenspielen und Zusammenarbeiten verschiedener Personen und Gruppen. Schnittstellen und Arbeitsteilungen tayloristischen Ursprungs scheinen durch vielfältige Kommunikations- und Kooperationsformen abgelöst zu werden(vgl. Womack, Jones & Roos, 1991). Die vorgenannten Befunde gelten vor allem für die Zusammenarbeit zwischen Zulieferern und Endherstellern in der Automobilbranche; einem Feld, das durch ein hohes Niveau an Arbeitsteilung bestimmt ist. Der Bedarf für Kooperationen scheint also genau an einer Stelle intensiver Arbeitsteilung zu steigen. Die Zulieferbeziehungen sollen sich - so die Einschätzung vieler Automobilmanager - zunehmend in Richtung Partnerschaft, Zusammenarbeit, Dialog und Kooperation entwickeln. Eine Befragung von über 100 Führungskräften der wichtigsten deutschen Automobilhersteller und -zulieferer ergab bereits vor wenigen Jahren, daß eine Verbesserung der eigenen Wettbewerbssituation nur durch die Veränderung der Beziehung zwischen Herstellern und Zulieferern möglich zu sein scheint (vgl. Wildemann 1988). Gegenwärtig sind die vorgenannten Begriffe jedoch (noch) wenig geeignet, um das Verhältnis zwischen Endherstellern und Zulieferern zu umschreiben (vgl. Mendius & Wendeling-Schröder 1991). Unsere zentrale These lautet dennoch: Die traditionellen Formen zwischenbetrieblicher Arbeitsteilung werden in den nächsten Jahren durch neue Formen der Zusammenarbeit abgelöst, die einen starken kooperativen Charakter haben und das Erfahrungswissen der Facharbeiter stärker nutzen werden als bisher (vgl. Wehner, Rauch & Bromme 1990). Zwischenbetriebliche lean-Strukturen werden nur in dem Ausmaß entstehen können, wie es gelingt, die Organisationsstrukturen der beteiligten Unternehmen stärker aufeinander zu beziehen. Dies ist weniger durch informationstechnische Vernetzungen möglich, sondern setzt den Aufbau von zwischenbetrieblichen Kooperationsnetzwerken voraus.
Investigations into inkjet cell printing hydrodynamics through microscopy imaging techniques
Creators: name: Cheng, Eric
Publisher: name: University of British Columbia
Year: 2015

description: Inkjet bioprinting technology aims to accurately and precisely dispense biological materials in a spatially predefined pattern within a three-dimensional space. The technology has a multitude of applications in the biomedical field such as in drug discovery and tissue or organ engineering. However, there are known limitations in an inkjet nozzle's capabilities in dispensing cells as the cell ejection rate does not follow any predictable distributions. In this work, the cell behaviors within a piezoelectric nozzle due to droplet ejection were classified through high speed brightfield imaging. With each ejected droplet, one of three cell behaviors was observed to occur: cell travel, cell ejection, or cell reflection. Cell reflection is an undesirable phenomenon which may adversely affect an inkjet's capability to reliably dispense cells. To further study how the hydrodynamics within a nozzle can influence the cell's behavior, µPIV was performed to identify the flow field evolution during droplet ejection. Through the study of cell motion, it was observed that the viscosity of the media in the cell suspension plays an important role in influencing the cell behavior. This was experimentally studied with the tracking of cells within the inkjet nozzle in a higher viscosity 10% w/v Ficoll PM400 cell suspension. As hypothesized, the addition of Ficoll PM400 was effective in preventing the occurrence of cell reflection which promises to increase the reliability in inkjet bioprinting systems.
"GREEN" ECONOMY IN ENSURING SUSTAINABLE DEVELOPMENT RELAY
Creators: name: Safarova, Dilfuza
name: Muminova, Dilrabo
Publisher: name: Zenodo
Year: 2025

description: currently, most world countries are following the path of a "green" economy, which is a guarantee of the development of the country's sustainable development. The 21st century is faced by many scientists around the world with the need to switch to a "green" economy due to environmental problems such as climate change, constant population growth - social problems, unemployment growth, economic problems regularly occurring in various sectors of the economy. This requires the eca to carry out strikes in this area.
Cusp points in the parameter space of RPR-2PRR parallel manipulator
Creators: name: Moroz, Guillaume Inria
name: Chablat, Damien
name: Wenger, Philippe
name: Rouiller, Fabrice
Publisher: name: arXiv
Year: 2010
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: This paper investigates the existence conditions of cusp points in the design parameter space of the R\underline{P}R-2P\underline{R}R parallel manipulators. Cusp points make possible non-singular assembly-mode changing motion, which can possibly increase the size of the aspect, i.e. the maximum singularity free workspace. The method used is based on the notion of discriminant varieties and Cylindrical Algebraic Decomposition, and resorts to Gröbner bases for the solutions of systems of equations.
Rewritable nanoscale oxide photodetector
Creators: name: Irvin, Patrick
name: Ma, Yanjun
name: Bogorin, Daniela F.
name: Cen, Cheng
name: Bark, Chung Wung
name: Folkman, Chad M.
name: Eom, Chang-Beom
name: Levy, Jeremy
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Nanophotonic devices seek to generate, guide, and/or detect light using structures whose nanoscale dimensions are closely tied to their functionality. Semiconducting nanowires, grown with tailored optoelectronic properties, have been successfully placed into devices for a variety of applications. However, the integration of photonic nanostructures with electronic circuitry has always been one of the most challenging aspects of device development. Here we report the development of rewritable nanoscale photodetectors created at the interface between LaAlO3 and SrTiO3. Nanowire junctions with characteristic dimensions 2-3 nm are created using a reversible AFM writing technique. These nanoscale devices exhibit a remarkably high gain for their size, in part because of the large electric fields produced in the gap region. The photoconductive response is gate-tunable and spans the visible-to-near-infrared regime. The ability to integrate rewritable nanoscale photodetectors with nanowires and transistors in a single materials platform foreshadows new families of integrated optoelectronic devices and applications.
description: 5 pages, 5 figures. Supplementary Information 7 pages, 9 figures
Die Situation des Fahrens : Phänomenologische und ökologische Perspektiven der Psychologie
Creators: name: Dick, Michael
Publisher: name: TUHH Universitätsbibliothek
Year: 2001
Subjects: subject: Fahren
subject: 150: Psychologie
subject: 380: Handel, Kommunikation, Verkehr
subject: 55.89:Verkehrswesen, Transportwesen: Sonstiges
subject: 77.93:Angewandte Psychologie
subject: Fahrerverhalten
subject: Verkehrsverhalten
subject: Verkehrspsychologie
subject: Mobilität
subject: Fortbewegung
subject: 55.89
subject: 77.93
subject: 150
subject: 380

description: Mit dem Blick auf die Situation des Fahrens sollen neue Perspektiven auf ein vielfältig diskutiertes Phänomen erschlossen werden. Der Gegenstand des Fahrens in verschiedenen psychologischen Subdisziplinen wird zu Beginn der Arbeit nachgezeichnet... Zentrale psychologische Merkmale wie der horizontale Blick, die leibliche Einheit mit dem Fahrzeug, die eigene Steuertätigkeit oder die motorisierte Übersetzung körpereigener in Fortbewegung lassen es als sinnvoll erscheinen, das Auto- und Motorradfahren zusammenzufassen und von anderen Fortbewegungsarten, etwa dem öffentlichen Transport oder dem Fahrradfahren und Gehen abzugrenzen. Das Motorbootfahren weist phänomenologisch interessante Ähnlichkeiten zum Auto- und Motorradfahren auf, wird aber nicht berücksichtigt, da es für die Mobilitätsproblematik vergleichsweise marginal ist. Gleiches gilt für das Skifahren und das Segeln, die zwar nicht motorisiert sind, sich aber andere physikalische Kräfte zur Beschleunigung zu eigen machen. Für diese vorgeschlagene Kategorisierung gibt es bisher lediglich einen technokratischen Begriff: MIV (Motorisierter Individualverkehr). In dieser Arbeit verwende ich den Begriff Fahren für die Nutzung selbstgesteuerter Fahrzeuge und betrachte nur die motorisierten darunter. Ich wähle einen theoretischen und einen empirischen Zugang zum Phänomen des Fahrens. In der Chronologie des Forschungsprozesses stand die Empirie am Anfang, so wie es einem entdeckenden Forschungsdesign entspricht. Die theoretische Arbeit erfolgte im Anschluss an die Empirie, vor allem auch, weil sich das Thema „Mobilität“ aus der Erforschung der „subjektiven Welt des Fahrens“ heraus zu einem Schwerpunkt unserer Arbeitsgruppe entwickelte. Ging es zunächst darum, den Reiz des Fahrerlebnisses empirisch zu entfalten und dessen positive Valenz aus der Tätigkeit selbst heraus zu begründen, erweiterte sich die Fragestellung anschließend zu einem anwendungsbezogenen interdisziplinären Projekt mit Verkehrswissenschaftlern und Stadtplanern. Dabei zeigte sich, dass gerade der Anwendungsbezug und die Vermittlung psychologischen Denkens über Fachgrenzen hinaus die Explikation grundsätzlicher Orientierungen erfordert. Es reicht eben nicht aus, beispielsweise experimentelle Befunde über Verkehrsmittelwahl zu referieren, der gemeinsame gestalterische Impuls erfordert eine Verständigung darüber, als was Verkehrsmittelwahl verstanden werden soll. Dabei wird interdisziplinär weitgehend vorausgesetzt, dass sie als Teil einer subjektiven Motivstruktur in alltägliche Handlungs- und Tätigkeitsvollzüge eingebettet ist.
Interior and modal masters in condensation methods for eigenvalue problems
Creators: name: Voß, Heinrich
Publisher: name: TUHH Universitätsbibliothek
Year: 1997
Subjects: subject: 510: Mathematik
subject: Eigenwertproblem
subject: Kondensation
subject: 510
subject: 65F15:Eigenvalues, eigenvectors
subject: 65F15

description: In the dynamic analysis of structures condensation methods are often used to reduce the number of degrees of freedom to manageable size. Substructuring and choosing the master variables as the degrees of freedom on the interfaces of the substructures yields data structures which are well suited to be implemented on parallel computers. In this paper we discuss the additional use of interior masters and modal masters in substructuring. The data structure is preserved such that the condensed problem can be determined substructurewise.
Purely Kinetic Coupled Gravity
Creators: name: Gubitosi, Giulia
name: Linder, Eric V.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Cosmic acceleration can be achieved not only with a sufficiently flat scalar field potential but through kinetic terms coupled to gravity. These derivative couplings impose a shift symmetry on the scalar field, aiding naturalness. We write the most general purely kinetic action not exceeding mass dimension six and obeying second order field equations. The result reduces to a simple form involving a coupling of the Einstein tensor with the kinetic term and can be interpreted as adding a new term to Galileon gravity in curved spacetime. We examine the cosmological implications of the effective dark energy and classify the dynamical attractor solutions, finding a quasistable loitering phase mimicking late time acceleration by a cosmological constant.
description: 7 pages, 3 figures
“Das ist doch das Einzige, was ich habe an Kapital”. Mitarbeitereinschätzungen über Wissensmanagement
Creators: name: Dick, Michael
name: Hainke, Steffen
Publisher: name: TUHH Universitätsbibliothek
Year: 1999
Subjects: subject: Organisationspsychologie
subject: Wissensmanagement
subject: 150: Psychologie
subject: 650: Management
subject: 85.20:Betriebliche Information und Kommunikation
subject: 06.35:Informationsmanagement
subject: Wissensmanagement
subject: 06.35
subject: 85.20
subject: 330
subject: 650
subject: 150

description: Die Zusammenarbeit mit der heutigen DaimlerChrysler Aerospace Airbus in einem Pilotprojekt zum Thema Know-how-Management war der Anlaß, häufig vor Ort und in Kontakt mit den Mitarbeitern der Pilotabteilung zu sein. Im Rahmen einer Studienarbeit führte Steffen Hainke dort offene Interviews zum Stand des Projekts und zum Thema Wissen in der Organisation durch. Aus seiner Erhebung und Auswertung des Materials geht dieser empirische Beitrag hervor, der Wissensmanagement aus der bisher wenig beleuchteten Perspektive betroffener Wissensträger selbst zeigt.
Designing coupled microcavity lasers for high-Q modes with unidirectional light emission
Creators: name: Ryu, Jung-Wan
name: Hentschel, Martina
Publisher: name: arXiv
Year: 2011
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We design coupled optical microcavities and report directional light emission from high-$Q$ modes for a broad range of refractive indices. The system consists of a circular cavity that provides a high-$Q$ mode in form of a whispering gallery mode, whereas an adjacent deformed microcavity plays the role of a waveguide or collimator of the light transmitted from the circular cavity. As a result of this very simple, yet robust, concept we obtain high-$Q$ modes with promising directional emission characteristics. No information about phase space is required, and the proposed scheme can be easily realized in experiments.
description: 3 pages, 3 figures
Quantum Maxwell's Demon in Thermodynamic Cycles
Creators: name: Dong, H.
name: Xu, D. Z.
name: Sun, C. P.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the physical mechanism of Maxwell's Demon (MD) helping to do extra work in thermodynamic cycles, by describing measurement of position, insertion of wall and information erasing of MD in a quantum mechanical fashion. The heat engine is exemplified with one molecule confined in an infinitely deep square potential inserted with a movable solid wall, while the MD is modeled as a two-level system (TLS) for measuring and controlling the motion of the molecule. It is discovered that the the MD with quantum coherence or on a lower temperature than that of the heat bath of the particle would enhance the ability of the whole work substance formed by the system plus the MD to do work outside. This observation reveals that the role of the MD essentially is to drive the whole work substance being off equilibrium, or equivalently working with an effective temperature difference. The elaborate studies with this model explicitly reveal the effect of finite size off the classical limit or thermodynamic limit, which contradicts the common sense on Szilard heat engine (SHE). The quantum SHE's efficiency is evaluated in detail to prove the validity of second law of thermodynamics.
description: 12 pages, 5 figures
Symmetric schemes for computing the minimum eigenvalue of a symmetric Toeplitz matrix
Creators: name: Voß, Heinrich
Publisher: name: TUHH Universitätsbibliothek
Year: 1998
Subjects: subject: Toeplitz matrix
subject: eigenvalue problem
subject: projection method
subject: symmetry
subject: 510: Mathematik
subject: Toeplitz-Matrix
subject: Eigenwertproblem
subject: 510
subject: 65F15:Eigenvalues, eigenvectors
subject: 65F15

description: In [8] and [9] W. Mackens and the present author presented two generalizations of a method of Cybenko and Van Loan [4] for computing the smallest eigenvalue of a symmetric, positive definite Toeplitz matrix. Taking advantage of the symmetry or skew-symmetry of the corresponding eigenvector both methods are improved considerably.
SOCIAL HEALTH OF RUSSIAN YOUTH: THE SPECIFICITY OF SOCIAL AND MANAGERIAL TECHNOLOGIES OF FORMATION
Creators: name: Chikaeva, Karina S.
Publisher: name: TUENGR Group
Year: 2018
Subjects: Technology-based social management, Social interaction, Russian society.

description: International Transaction Journal of Engineering, Management, & Applied Sciences & Technologies, 9, 6, 515-525
Bioassay-guided isolation of potent α-glucosidase inhibitory compounds from the fruit of Piper mullesua Buch–Ham ex D Don. and their in silico screening
Creators: name: Hazarika, Moushumi
name: Borah, Nirangkush
name: Rastogi, Gaurav
name: Gogoi, Dipsikha
name: Chetia, Pankaj
name: Tamuly, Chandan
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Biochemistry
subject: Pharmacology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: Two bioactive compounds caffeic and sinapic acid were isolated from the fruit of the Piper mullesua Buch–Ham ex D Don using bioassay guided approach. These compounds were isolated from water fraction using column chromatography followed by semi preparative HPLC. These compounds showed very potent anti-diabetic and antioxidant activities. The molecular docking was carried out to predict the mode of interaction of the isolated compounds with α-glucosidase. The in vitro α-glucosidase inhibitory activity of caffeic and sinapic acid was determined, and their IC50 values were found 0.67 and 0.82 µg/ml, respectively. A QSAR equation was generated with an R2 value of 84.81%, which is suitable enough for predicting the IC50 values of test molecules. The aforementioned finding confirms the isolated compounds show very significant anti-diabetic potential which is supported by the molecular docking and QSAR study. So, it has ample scope for drug development with further in vivo and clinical study.
ESTÁGIO ESPECÍFICO II EM PSICOLOGIA E PROCESSOS DE PREVENÇÃO E PROMOÇÃO DE SAÚDE
Creators: name: Nunes, Natália Noemia
name: Liz, Rafael Gustavo de
Publisher: name: Zenodo
Year: 2025

description: O objetivo do artigo encontra-se no estudo da aplicação das técnicas da Terapia Cognitiva Comportamental no contexto da prática clínica por intermédio do serviço- escola da graduação de psicologia.
Sizing up Lyman-alpha and Lyman Break Galaxies
Creators: name: Malhotra, Sangeeta
name: Rhoads, James E.
name: Finkelstein, Steven L.
name: Hathi, Nimish
name: Nilsson, Kim
name: McLinden, Emily
name: Pirzkal, Norbert
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We show that populations of high redshift galaxies grow more luminous as they grow in linear size. This is because the brightness per unit area has a distinct upper limit due to the self-regulating nature of star-formation. As a corollary, we show that the observed increase in characteristic luminosity of Lyman Break Galaxies (L*) with time can be explained by their increase in size, which scales as 1/H(z). In contrast, Lyman-alpha selected galaxies have a characteristic, constant, small size between redshift z=2.25 and 6.5. Coupled with a characteristic surface brightness, this can explain their non-evolving ultraviolet continuum luminosity function. This compact physical size seems to be a critical determining factor in whether a galaxy will show Lyman-alpha emission. We base these conclusions on new size measurements for a sample of about 170 Lyman-alpha selected galaxies with Hubble Space Telescope broad-band imaging, over the redshift range 2.25 < z < 6. We combine these with a similar number of Lyman-alpha selected galaxies with half-light radii from the literature, and derive surface brightnesses for the entire combined sample.
description: Submitted to ApJ letters, comments welcome
Irreducible A_1 Subgroups of Exceptional Algebraic Groups
Creators: name: Thomas, Adam
Publisher: name: arXiv
Year: 2015
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20G41, 20G15, 20G05

description: A closed subgroup of a semisimple algebraic group is called irreducible if it lies in no proper parabolic subgroup. In this paper we classify all irreducible $A_1$ subgroups of exceptional algebraic groups $G$. Consequences are given concerning the representations of such subgroups on various $G$-modules: for example, the conjugacy classes of irreducible $A_1$ subgroups are determined by their composition factors on the adjoint module of $G$.
description: 51 pages; published in J. Alg
Nearly Kähler manifolds of constant antiholomorphic sectional curvature
Creators: name: Ganchev, Georgi
name: Kassabov, Ognian
Publisher: name: arXiv
Year: 2010
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53B35

description: A classification theorem for nearly Kähler manifolds of constant antiholomorphic sectional curvature is proved.
description: 3 pages, MR 84a:53067
Additional file 2: of EBV-miR-BART8-3p induces epithelial-mesenchymal transition and promotes metastasis of nasopharyngeal carcinoma cells through activating NF-κB and Erk1/2 pathways
Creators: name: Lin, Cheng
name: Zong, Jingfeng
name: Lin, Wansong
name: Wang, Minghui
name: Xu, Yuanji
name: Zhou, Rui
name: Lin, Shaojun
name: Guo, Qiaojuan
name: Chen, Honglin
name: Ye, Yunbin
name: Zhang, Bin
name: Pan, Jianji
Publisher: name: figshare
Year: 2018
Subjects: subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Physiology
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Cancer
subject: Mental Health
subject: Hematology
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Figure S1. Gene ontology terms enriched in the up- and down-regulated gene signatures. The genes up-regulated in NPC are involved in cell cycle, neurogenesis and cell junction activities while those down-regulated are associated with immune response, suggesting activated cell proliferation and mitosis but inhibited immune defense in NPC. Figure S2. Upregulation of EBV-miR-BART8-3p shows no clear-cut effects on NPC cell proliferation in vitro. a, the effect of EBV-miR-BART8-3p on NPC CNE-1 and SUNE-1 cell proliferation is examined by CCK-8 assay; b, representative pictures (left panel) and quantification (left panel) of the colony-forming assays in CNE-1 and SUNE-1 cells. NS, no significant. Data are presented as mean ± SD. (DOCX 957 kb)
Interplay of Rotational, Relaxational, and Shear Dynamics in Solid 4He
Creators: name: Pratt, E. J.
name: Hunt, B.
name: Gadagkar, V.
name: Yamashita, M.
name: Graf, M. J.
name: Balatsky, A. V.
name: Davis, J. C.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Using a high-sensitivity torsional oscillator technique, we mapped the rotational and relaxational dynamics of solid helium-4 throughout the parameter range of the proposed supersolidity. We found evidence that the same microscopic excitations controlling the torsional oscillator motions are generated independently by thermal and mechanical stimulation. Moreover, a measure for the relaxation times of these excitations diverges smoothly without any indication for a critical temperature or critical velocity of a supersolid transition. Finally, we demonstrated that the combined temperature-velocity dependence of the TO response is indistinguishable from the combined temperature-strain dependence of the solid's shear modulus. This implies that the rotational responses of solid helium-4 attributed to supersolidity are associated with generation of the same microscopic excitations as those produced by direct shear strain.
description: 27 pages with 4 main figures and 7 supplemental figures
Multiple-input multiple-output converters for future low-voltage DC power distribution architectures
Creators: name: Tong, Yajian
Publisher: name: University of British Columbia
Year: 2015

description: Multiple-input multiple-output (MIMO) converters have been identified as a cost-effective approach for energy harvesting and dispatching in hybrid power systems such as those envisioned in future smart homes and DC microgrids. Compared with relatively complex set-up of single-input single-output (SISO) converters linked at a common DC bus to exchange power, the MIMO converters possess promising features of fewer components, higher power density, and centralized control. This thesis addresses various issues regarding the development of MIMO converters. Both non-isolated and isolated MIMO converter topologies are proposed. Steady-state analysis and dynamic modeling of MIMO non-inverting buck–boost and flyback converters are introduced and presented in detail. Specific switching strategies are proposed and appropriate control algorithms are presented to enable power budgeting between diverse sources and loads in addition to regulating output voltages. Furthermore, a simple method is put forward for deriving the non-isolated MIMO converters with DC-link inductor (DLI) and DC-link capacitor (DLC). Based on a basic structure, a set of rules is listed for the synthesis of MIMO converters. Using the time-sharing concept, multiple sources provide energy in one period, and multiple loads draw energy in the subsequent period. In the end, general techniques are introduced for extending the SISO converters to their MIMO versions, where parts of the conventional SISO converters are replaced with multiport structures. It is envisioned that MIMO converters presented in this thesis will find their acceptance in the future in various applications with DC distribution, which are becoming increasingly accepted by industry.
Joint space and workspace analysis of a two-DOF closed-chain manipulator
Creators: name: Chablat, Damien
Publisher: name: arXiv
Year: 2010
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: The aim of this paper is to compute of the generalized aspects, i.e. the maximal singularity-free domains in the Cartesian product of the joint space and workspace, for a planar parallel mechanism in using quadtree model and interval analysis based method. The parallel mechanisms can admit several solutions to the inverses and the direct kinematic models. These singular configurations divide the joint space and the workspace in several not connected domains. To compute this domains, the quadtree model can be made by using a discretization of the space. Unfortunately, with this method, some singular configurations cannot be detected as a single point in the joint space. The interval analysis based method allow us to assure that no singularities are not found and to reduce the computing times. This approach is tested on a simple planar parallel mechanism with two degrees of freedom.
How many bits does it take to track an open quantum system?
Creators: name: Karasik, R. I.
name: Wiseman, H. M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A $D$-dimensional Markovian open quantum system will undergo quantum jumps between pure states, if we can monitor the bath to which it is coupled with sufficient precision. In general these jumps, plus the between-jump evolution, create a trajectory which passes through infinitely many different pure states. Here we show that, for any ergodic master equation, one can expect to find an {\em adaptive} monitoring scheme on the bath that can confine the system state to jumping between only $K$ states, for some $K \geq (D-1)^2+1$. For $D=2$ we explicitly construct a 2-state ensemble for any ergodic master equation, showing that one bit is always sufficient to track a qubit.
description: 5 pages, 5 figures
Bioassay-guided isolation of potent α-glucosidase inhibitory compounds from the fruit of Piper mullesua Buch–Ham ex D Don. and their in silico screening
Creators: name: Hazarika, Moushumi
name: Borah, Nirangkush
name: Rostagi, Gaurav
name: Gogoi, Dipsikha
name: Chetia, Pankaj
name: Tamuly, Chandan
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Biochemistry
subject: Pharmacology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: Two bioactive compounds caffeic and sinapic acid were isolated from the fruit of the Piper mullesua Buch–Ham ex D Don using bioassay guided approach. These compounds were isolated from water fraction using column chromatography followed by semi preparative HPLC. These compounds showed very potent anti-diabetic and antioxidant activities. The molecular docking was carried out to predict the mode of interaction of the isolated compounds with α-glucosidase. The in vitro α-glucosidase inhibitory activity of caffeic and sinapic acid was determined, and their IC50 values were found 0.67 and 0.82 µg/ml, respectively. A QSAR equation was generated with an R2 value of 84.81%, which is suitable enough for predicting the IC50 values of test molecules. The aforementioned finding confirms the isolated compounds show very significant anti-diabetic potential which is supported by the molecular docking and QSAR study. So, it has ample scope for drug development with further in vivo and clinical study.
Helping relationships in Portuguese Canadian communities
Creators: name: Morrison, Marie
Publisher: name: University of British Columbia
Year: 2015

description: A qualitative study using ethnographic methods was conducted within the Portuguese Canadian community to describe how individuals engage in helping relationships related to personal or emotional problems. Using Spradley’s (1979) Developmental Research Sequence (DRS), participant observation, informal group interviews, and formal individual interviews were conducted with Portuguese community members and helpers. Ten informants of Portuguese descent were interviewed. Research codes and domain structures were subjected to participant checks, peer review, and expert review in order to establish the credibility and trustworthiness of this study. Ten domains were described as follows: Reliance on Family; Focus on Physical Ailments; Using Substances and Gambling to Cope with Problems; Accessing the Portuguese Community to Prevent or Cope with Problems; Receiving Help from the Church; Using Forms of Traditional Healing; Accessing Help through Family Physicians; Help Outside the Community; Reasons for Seeking Professional Help; and Barriers to Seeking Help. Cultural themes that arose from the domains were Cultural Rules for Disclosure in Different Contexts, Role Clarity, and Fatalism. This study contributes to counselling psychology research in the following ways: 1) by providing a thick description of helping relationships in the Portuguese community, a topic that has not previously been present in the counselling psychology literature; 2) by presenting barriers to counselling and reasons for seeking counselling that are specific to this population; and 3) by describing aspects of the therapeutic relationship which are culturally relevant to this group. These descriptions provide an easily accessible resource enabling mental health care providers to interact with Portuguese immigrants in a culturally safer and ii more competent manner. This study with a difficult-to-reach population serves as an example of learning to improve or modify mental health services to meet specific cultural contexts.
First principles study of the influence of (110)-oriented strain on the ferroelectric properties of rutile TiO$_2$
Creators: name: Grünebohm, A.
name: Ederer, C.
name: Entel, P.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We use first principles density functional theory to investigate the softening of polar phonon modes in rutile TiO$_2$ under tensile (110)-oriented strain. We show that the system becomes unstable against a ferroelectric distortion with polarization along (110) for experimentally accessible strain values. The resulting polarization, estimated from the Born effective charges, even exceeds the bulk polarization of BaTiO$_3$. Our calculations demonstrate the different strain dependence of polar modes polarized along (110) and (001) directions, and we discuss the possibility of strain engineering the polarization direction, and the resulting dielectric and piezoelectric response, in thin films of TiO$_2$ grown on suitable substrates.
description: 5 pages, 3 figures, 1 table
Spectroscopic signature of phosphate crystallization in Erbium-doped optical fibre preforms
Creators: name: Peretti, Romain
name: Jurdyc, Anne-Marie
name: Jacquier, Bernard
name: Blanc, Wilfried
name: Dussardier, Bernard
Publisher: name: arXiv
Year: 2011
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: In rare-earth-doped silica optical fibres, the homogeneous distribution of amplifying ions and part of their spectroscopic properties are usually improved by adding selected elements, such as phosphorus or aluminum, as structural modifier. In erbium ion (Er3+) doped fibres, phosphorus preferentially coordinates to Er3+ ions to form regular cages around it. However, the crystalline structures described in literature never gave particular spectroscopic signature. In this article, we report emission and excitation spectra of Er3+ in a transparent phosphorus-doped silica fibre preform. The observed line features observed at room and low temperature are attributed to ErPO4 crystallites.
Models of population dynamics under the influence of external perturbations: mathematical results
Creators: name: Chekroun, Mickaël D.
name: Roques, Lionel
Publisher: name: arXiv
Year: 2010
Subjects: subject: Analysis of PDEs (math.AP)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 35K57, 35K55, 35J60, 35P05, 35P15, 92D25, 92D40, 60G60

description: In this Note, we describe the stationary equilibria and the asymptotic behaviour of an heterogeneous logistic reaction-diffusion equation under the influence of autonomous or time-periodic forcing terms. We show that the study of the asymptotic behaviour in the time-periodic forcing case can be reduced to the autonomous one, the last one being described in function of the "size" of the external perturbation. Our results can be interpreted in terms of maximal sustainable yields from populations. We briefly discuss this last aspect through a numerical computation.