cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Vergleichende Untersuchungen und prospektive Datenerhebung und Analyse von Schäden bei Latex-OP-Handschuhen in der Primärendoprothetik, Wechselendoprothetik und bei arthroskopischen Eingriffen
Creators: name: König, Tony
Publisher: name: Universität Rostock
Year: 2020
Subjects: subject: 610 Medical sciences Medicine

description: Intraoperative Perforationen von OP-Handschuhen in der Orthopädie aufgrund Umgang mit scharfkantigen Implantaten bzw. Explantatbestandteilen und Zementbruchstücken sind ein großes Problem. Ziel: Ermittlung des Perforationsrisikos von OP-Handschuhen bei bestimmten orthopädischen Eingriffen. Determinierung von Läsionen erfolgte in Anlehnung an ISO EN 455-1:2000. Ergebnisse zeigen neben Lokalisation und Größe der Perforationen positive Korrelation in Anzahl geschädigter Handschuhe vs. OP-Zeit bei Revisionseingriffen. Darstellung erhöhte Perforationsgefahr bei zunehmender mechanischer Belastung, während orthopädische OP zu erhöhtem SSI-Risiko führen.
Combining Density Functional Theory and Density Matrix Functional Theory
Creators: name: Rohr, Daniel R.
name: Toulouse, Julien
name: Pernal, Katarzyna
Publisher: name: arXiv
Year: 2010
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We combine density-functional theory with density-matrix functional theory to get the best of both worlds. This is achieved by range separation of the electronic interaction which permits to rigorously combine a short-range density functional with a long-range density-matrix functional. The short-range density functional is approximated by the short-range version of the Perdew-Burke-Ernzerhof functional (srPBE). The long-range density-matrix functional is approximated by the long-range version of the Buijse-Baerends functional (lrBB). The obtained srPBE+lrBB method accurately describes both static and dynamic electron correlation at a computational cost similar to that of standard density-functional approximations. This is shown for the dissociation curves of the H$_{2}$, LiH, BH and HF molecules.
description: 4 pages, 5 figures
Γεωπολιτικές πτυχές της διακυβέρνησης της ΕΣΣΔ, στην ύστερη περίοδο παρουσίας της
Creators: name: Χιοκτούρης, Αντώνιος Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2023
Subjects: Σοβιετική Ένωση- ΕΣΣΔ
Γεωπολιτική
Γκορμπατσόφ Μ.
Νέα Σκέψη
Soviet Union- USSR
Geopolitics
Gorbachev M.
New Thinking

description: Σκοπός της διπλωματικής εργασίας είναι ο εντοπισμός της γεωπολιτικής μεταξύ των αποχρώσεων του φάσματος το οποίο παράγεται καθώς η πολιτική διακυβέρνηση της ΕΣΣΔ, διέρχεται μέσω του κατάλληλου πρίσματος. «Αφγανιστάν», «Πολωνία», «Επιτάχυνση», «Περεστρόικα», «Γκλάσνοστ», «Σοσιαλιστική Οικονομία της Αγοράς», «Νέα Σκέψη», «Κοινό Ευρωπαϊκό Σπίτι», «Παγκόσμια Ειρήνη», «Διεθνής Αφοπλισμός», «Αταξική Εξωτερική Πολιτική», αποτέλεσαν σταθμούς της τελευταίας διαδρομής την οποία διένυσε η Σοβιετική Ένωση, συνθέτοντας παράλληλα το ψηφιδωτό της –ενδεχομένως– «μεγαλύτερης γεωπολιτικής καταστροφής του 20ού αιώνα». Αδιαμφισβήτητα, η διάλυση της ΕΣΣΔ εισήγαγε πολύ σύντομα τον κόσμο μας στην εποχή της «Μοναδικής Υπερδύναμης». Περίπου τριάντα χρόνια αργότερα, οι ΗΠΑ δίνουν λυσσαλέο αγώνα για την παράταση του ιστορικού κύκλου της παγκόσμιας κυριαρχίας τους, κόντρα στην ανάδυση της Λαϊκής Δημοκρατίας της Κίνας και άλλων δυνάμεων οι οποίες αξιώνουν –τουλάχιστον– έναν «πολυπολικό» κόσμο. Έχοντας ως γνώμονα τις παραδοχές της γεωπολιτικής μεθόδου ανάλυσης στην ιστορική εξέλιξη των διακρατικών σχέσεων, η εργασία δίνει έμφαση στη διαμόρφωση, στον τρόπο εφαρμογής και στα αποτελέσματα της κυβερνητικής πολιτικής της ΕΣΣΔ κατά τη διάρκεια της ύστερης περιόδου της ύπαρξής της
description: The purpose of the present dissertation is the search for geopolitics in the distribution of the spectrum which is produced if the political governance of the USSR, passes through the appropriate prism. "Afghanistan", "Poland", "Acceleration", "Perestroika", "Glasnost", "Market Socialism", "New Thinking", "Common European Home", "World Peace", "Nuclear Disarmament", "Non-Class Foreign Policy", were stations of the last route traveled by the USSR. At the same time, they composed the mosaic of possibly "the greatest geopolitical disaster of the 20th century". USSR disintegration indeed very soon introduced our world into the era of the "Οnly Superpower". Some thirty years later it forces the USA into a furious struggle to prevent their decline, due to the emergence of the People's Republic of China and other powers that claim - at least - a "multipolar" world. In the context of the work, emphasis is placed on the formation, the way of implementation and the results of the governmental policy exercised by the USSR, during the late period of its existence, based on the general assumptions of the geopolitical method of analysis of the historical evolution of interstate relations
Freely suspended two-dimensional electron gases
Creators: name: Blick, Robert H.
name: Roukes, M. L.
name: Wegscheider, Werner
name: Bichler, Max
Publisher: name: Universität Regensburg
Year: 1998
Subjects: subject: AlGaAs/GaAs/AlAs; Heterostructures
subject: 530 Physik

description: We present a new technique allowing us to build freely suspended two-dimensional electron gases from AlGaAs/GaAs/AlAs heterostructures. This technique relies on an MBE-grown structures that includes a sacrificial layer.
G-Mode Excitation During the Pre-explosive Simmering of Type Ia Supernovae
Creators: name: Piro, Anthony L.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Prior to the explosive burning of a white dwarf (WD) that makes a Type Ia supernova (SN Ia), the star "simmers" for ~10^3 yrs in a convecting, carbon burning region. I estimate the excitation of g-modes by convection during this phase and explore their possible affect on the WD. As these modes propagate from the core of the WD toward its surface, their amplitudes grow with decreasing density. Once the modes reach nonlinear amplitudes, they break and deposit their energy into a shell of mass ~10^{-4}M_\odot. This raises the surface temperature by 6*10^8 K, which is sufficient to ignite a layer of helium, as is expected to exist for some SN Ia scenarios. This predominantly synthesizes 28Si, 32S, 40Ca, and some 44Ti. These ashes are expanded out with the subsequent explosion up to velocities of ~20,000 km/s, which may explain the high velocity features (HVFs) seen in many SNe Ia. The appearance of HVFs would therefore be a useful discriminant for determining between progenitors, since a flammable helium-rich layer will not be present for accretion from a C/O WD as in a merger scenario. I also discuss the implications of 44Ti production.
description: Submitted for publication in The Astrophysical Journal Letters, 5 pages, 1 figures
title: Реконструкция промышленных зданий и сооружений
Creators: name: ELS IPR BOOKS
Publisher: name: Ай Пи Ар Медиа
Year: 2025

description: Учебное пособие содержит материалы для лекционных и практических занятий и рассматривает вопросы реконструкции производственных зданий, имеющие существенное отличие от реконструкции гражданских зданий как в проектировании, так и в технологии строительно-монтажных работ. Издание знакомит студентов с проблемами технического перевооружения и реконструкции промышленных предприятий, с перепрофилированием зданий и сооружений, с вопросами закрывающихся производств. Раскрыт ряд специфичных вопросов, касающихся особенностей физического и морального износа производственных зданий и сооружений, особенностей модификаций в связи с техническим перевооружением, особенностей реконструкции оснований, фундаментов, ограждающих, несущих строительных конструкций и других вопросов, возникающих при реконструкции промышленных объектов. Подготовлено с учетом требований Федерального государственного образовательного стандарта высшего образования. Учебное пособие предназначено для бакалавров и магистрантов, обучающихся по направлениям подготовки «Архитектура», «Строительство», «Дизайн архитектурной среды», изучающих дисциплину «Основы реконструкции зданий и сооружений».
Clinical Data Management Activities During Clinical Trials
Creators: name: Chaithanya Kolluri
name: Maheshwar Kolluri
name: Venkat Ramaiyan
Publisher: name: Zenodo
Year: 2023
Subjects: Clinical Data Management, Clinical Trials, Study Startups, Procedures, and Conducts Close-Out Activities.

description: Abstract
Establishing the most powerful treatment methods and developing new drugs is not easy. Most processes and procedures in clinical trials have faced challenges since they need high-quality data for reporting to get approval from regulatory authorities. Equally, there is a need for high accuracy in clinical trials data management procedures to ensure high efficacy in newly developed drugs. The growth of clinical data management in clinical trials is playing its role in clinical development, leading to the parallel growth of startups and procedures related to clinical data management in most clinical trials. In this part, clinical data management plays a crucial role. Start-up, Conduct and Close-out activities help in the smooth processing of data collection, accuracy, and quality.
Abel-Jacobi map, integral Hodge classes and decomposition of the diagonal
Creators: name: Voisin, Claire
Publisher: name: arXiv
Year: 2010
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics

description: Given a smooth projective 3-fold Y, with $H^{3,0}(Y)=0$, the Abel-Jacobi map induces a morphism from each smooth variety parameterizing 1-cycles in Y to the intermediate Jacobian J(Y). We study in this paper the existence of families of 1-cycles in Y for which this induced morphism is surjective with rationally connected general fiber, and various applications of this property. When Y itself is rationally connected, we relate this property to the existence of an integral homological decomposition of the diagonal. We also study this property for cubic threefolds, completing the work of Iliev-Markoushevich. We then conclude that the Hodge conjecture holds for degree 4 integral Hodge classes on fibrations into cubic threefolds over curves, with restriction on singular fibers.
Quantum dots fabricated by twofold cleaved edge overgrowth
Creators: name: Schedelbeck, Gert
name: Wegscheider, Werner
name: Rother, Martin
name: Glutsch, S.
name: Bichler, Max
name: Abstreiter, Gerhard
Publisher: name: Universität Regensburg
Year: 1998
Subjects: subject: Quantum dots; Cleaved edge overgrowth (CEO); Coupling
subject: 530 Physik

description: Cleaved edge overgrowth (CEO) has proven to be a powerful technique for the fabrication of atomic scale T-shaped quantum wires (QWRs) which form at the intersection of two quantum wells (QWs). Here we report on the first experimental demonstration of quantum dots (QDs) which result when three QWs intersect each other at right angles. Optical emission from zero-dimensional (0D) states in these QDs which were fabricated by a twofold CEO technique is clearly identified by means of micro-photoluminescence (Image PL) and Image PL excitation (Image PLE) spectroscopy. In contrast to the inhomogeneously broadened QW and QWR signals originating from the complex sample structure, the QD response, which is characterised by sharp lines (FWHM Image 70 Image eV), is strongly spatially localised at a position where the QWs meet.
New Resistance Maxima in the Fractional Quantum Hall Effect Regime
Creators: name: Kronmüller, S.
name: Dietsche, W.
name: Weis, J.
name: Klitzing, Klaus von
name: Wegscheider, Werner
name: Bichler, Max
Publisher: name: Universität Regensburg
Year: 1998
Subjects: subject: 530 Physik
subject: 73.40.Hm, 73.20.Dx

description: The magnetoresistance of a narrow single quantum well is spectacularly different from the usual behavior. At filling factors 2 / 3 and 3 / 5 we observe large and sharp maxima in the longitudinal resistance instead of the expected minima. The peak value of the resistance exceeds those of the surrounding magnetic field regions by a factor of up to 3. The formation of the maxima takes place on very large time scales which suggests a close relation with nuclear spins. We discuss the properties of the observed maxima due to a formation of domains of different electronic states.
Η υποχρέωση συμμόρφωσης της διοίκησης στις αποφάσεις περί αντισυνταγματικότητας και η προβληματική της επέκτασης της υποχρέωσης αυτής στον νομοθέτης
Creators: name: Καζάκος, Ιωάννης Νεκτάριος Θωμά
Publisher: name: Aristotle University of Thessaloniki
Year: 2023
Subjects: O δικαστικός έλεγχος της συνταγματικότητας των νόμων
Η υποχρέωση συμμόρφωσης της διοίκησης
Η συμμόρφωση νομοθέτη στις αποφάσεις περί αντισυνταγματικότητας
The judicial review of the constitutionality of laws
The obligation of the administration to comply with court decisions
The compliance of the legislator with court decisions on unconstitutionality

description: Ο σκοπός της παρούσας μελέτης είναι η αναζήτηση της σύνδεσης ανάμεσα στην υποχρέωση συμμόρφωσης της διοίκησης στις δικαστικές αποφάσεις και στον δικαστικό έλεγχο συνταγματικότητας των νόμων στο ελληνική έννομη τάξη. Πιο συγκεκριμένα, η μελέτη επικεντρώνεται σε δύο σημεία: Πρώτον, στοχεύει στην ανάλυση της έννοιας, της έκτασης και του περιεχομένου της υποχρέωσης συμμόρφωσης της διοίκησης στις αποφάσεις που διαγιγνώσκουν την αντισυνταγματικότητας ενός νόμου. Δεύτερον, επιχειρεί να απαντήσει στο ερώτημα αν υφίσταται ή όχι μία αντίστοιχη υποχρέωση συμμόρφωσης και για τον νομοθέτη, υπό το πρίσμα της αρχής της διάκρισης των λειτουργιών και των θεμελιωδών χαρακτηριστικών του ελληνικού συστήματος ελέγχου της συνταγματικότητας των νόμων
description: The purpose of the present study is to explore the connection between the obligation of the administration to comply with court decisions and the judicial review of the constitutionality of laws in Greece. The study focuses, in particular, on two points: Firstly, it aims analyze the concept, extent and content of the obligation of the administration to comply with court decisions that declare a law unconstitutional. Secondly, it attempts to answer the question whether or not there exists a corresponding obligation for the legislator too, from the view point of the principle of separation of powers and the fundamental characteristics of the Greek system of judicial review of legislation
Spectral Cross-calibration of the Konus-Wind, the Suzaku/WAM, and the Swift/BAT Data using Gamma-Ray Bursts
Creators: name: Sakamoto, T.
name: Pal'shin, V.
name: Yamaoka, K.
name: Ohno, M.
name: Sato, G.
name: Aptekar, R.
name: Barthelmy, S.
name: Baumgartner, W.
name: Cummings, J.
name: Fenimore, E.
name: Frederiks, D.
name: Gehrels, N.
name: Golenetskii, S.
name: Krimm, H.
name: Markwardt, C.
name: Onda, K.
name: Palmer, D.
name: Parsons, A.
name: Stamatikos, M.
name: Sugita, S.
name: Tashiro, M.
name: Tueller, J.
name: Ukwatta, T.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report on the spectral cross-calibration results of the Konus-Wind, the Suzaku/WAM, and the Swift/BAT instruments using simultaneously observed gamma-ray bursts (GRBs). This is the first attempt to use simultaneously observed GRBs as a spectral calibration source to understand systematic problems among the instruments. Based on these joint spectral fits, we find that 1) although a constant factor (a normalization factor) agrees within 20% among the instruments, the BAT constant factor shows a systematically smaller value by 10-20% compared to that of Konus-Wind, 2) there is a systematic trend that the low-energy photon index becomes steeper by 0.1-0.2 and Epeak becomes systematically higher by 10-20% when including the BAT data in the joint fits, and 3) the high-energy photon index agrees within 0.2 among the instruments. Our results show that cross-calibration based on joint spectral analysis is an important step to understanding the instrumental effects which could be affecting the scientific results from the GRB prompt emission data.
description: 82 pages, 88 figures, accepted for publication in PASJ
title: Benutzerzustandserfassung zur Regelung Kognitiver Assistenz an Bord von Marineschiffen
Creators: name: Schwarz, Jessica
Publisher: name: DuEPublico: Duisburg-Essen Publications Online, University of Duisburg-Essen, Germany
Year: 2013

description: Der Beitrag beschreibt die Identifizierung einer Methodik zur Erfassung des mentalen Zustands

von Operateuren an Bord von Marineschiffen auf Basis einer Literaturanalyse und die Validierung der

identifizierten Methodik in einem anwendungsnahen experimentellen Setting. Die Untersuchung wurde

mit dem Ziel durchgeführt, ein System zu entwickeln, das den mentalen Zustand von Operateuren

kontinuierlich und in Echtzeit überwacht und kritische Zustände z.B. Über- und Unterforderung oder

Übermüdung anzeigt. Im Weiteren soll dieses System als Grundlage zur Regelung eines kognitiven

Assistemzsystems für Marine-Einsatzsysteme dienen, welches den Unterstützungsgrad flexibel an den

jeweiligen Unterstützungsbedarf des Operateurs anpasst.
Direct writing of in-plane-gated nanostructures by focused laser beam-induced doping
Creators: name: Baumgartner, P.
name: Wegscheider, Werner
name: Bichler, Max
name: Groos, G.
name: Abstreiter, Gerhard
Publisher: name: Universität Regensburg
Year: 1998
Subjects: subject: Transport; Electronic nanostructures; Fabrication technique
subject: 530 Physik

description: The fabrication technique of local doping with a focused laser beam is employed to fabricate electronic nanostructures. Zn-doped regions are used to fabricate in-plane electron channels in a high mobility GaAs/AlGaAs heterostructure. The operation of different devices, like quantum point contacts, single electron transistors or Aharonov–Bohm rings, is demonstrated. The coplanar gate geometry improves the performance of the devices in charge sensing applications.
A Wideband, Low-Noise Superconducting Amplifier with High Dynamic Range
Creators: name: Eom, Byeong Ho
name: Day, Peter K.
name: LeDuc, Henry G.
name: Zmuidzinas, Jonas
Publisher: name: Keck Institute for Space Studies
Year: 2012

description: Amplifiers are ubiquitous in electronics and play a fundamental role in a wide range of scientific measurements. From a user's perspective, an ideal amplifier has very low noise, operates over a broad frequency range, and has a high dynamic range - it is capable of handling strong signals with little distortion. Unfortunately, it is difficult to obtain all of these characteristics simultaneously. For example, modern transistor amplifiers offer multi-octave bandwidths and excellent dynamic range. However, their noise remains far above the fundamental limit set by the uncertainty principle of quantum mechanics. Parametric amplifiers, which predate transistor amplifiers and are widely used in optics, exploit a nonlinear response to transfer power from a strong pump tone to a weak signal. If the nonlinearity is purely reactive, ie. nondissipative, in theory the amplifier noise can reach the quantum-mechanical limit. Indeed, microwave frequency superconducting Josephson parametric amplifiers do approach the quantum limit, but generally are narrow band and have very limited dynamic range. In this paper, we describe a superconducting parametric amplifier that overcomes these limitations. The amplifier is very simple, consisting only of a patterned metal film on a dielectric substrate, and relies on the nonlinear kinetic inductance of a superconducting transmission line. We measure gain extending over 2 GHz on either side of an 11.56 GHz pump tone, and we place an upper limit on the added noise of the amplifier of 3.4 photons at 9.4 GHz. Furthermore, the dynamic range is very large, comparable to microwave transistor amplifiers, and the concept can be applied throughout the microwave, millimeter-wave and submillimeter-wave bands.
Atomically precise quantum dots fabricated by two-fold cleaved edge overgrowth: from artificial atoms to molecules
Creators: name: Wegscheider, Werner
name: Schedelbeck, Gert
name: Bichler, Max
name: Abstreiter, Gerhard
Publisher: name: Universität Regensburg
Year: 1998
Subjects: subject: Quantum dots; Excitons; Coupling
subject: 530 Physik
subject: 73.20.Dx; 73.20.At; 78.55.Cr

description: The optical properties of different quantum dot structures consisting of individual dots, pairs of coupled dots as well as of linear arrays of dots have been studied experimentally. The Image Image size GaAs quantum dots form at the intersection of three orthogonal quantum wells fabricated by two-fold application of the cleaved edge overgrowth method. The high degree of control over shape, composition and position of the dots, achievable by this technique, allows a detailed investigation of the influence of coupling between almost identical zero-dimensional objects. In this way an “artifical molecule”, characterized by the existence of bonding and antibonding states, can be assembled from two of such “artificial atoms”. The coupling strength between the “artificial atoms” directly adjusts the “interatomic” distance and is reflected in the energetic separation of the bonding and antibonding levels and the line widths of the corresponding interband transitions observed by means of microscopic photoluminescence spectroscopy.
Time Adaptive Discrete Mechanics and Optimal
Control
Creators: name: Moore, Ashley
Publisher: name: Keck Institute for Space Studies
Year: 2011

description: Space mission design is often achieved through a combination of dynamical systems
theory and optimal control. This work focuses on how to adapt DMOC, a method
devised with a constant step size, for the highly nonlinear dynamics involved in
space problems including trajectory design and reconfiguration and docking of formation
flying cubesats, similar to those proposed for the KISS project’s reconfigurable
modular space telescope. A time adaptive form of DMOC is developed that
allows for a variable step size that is updated throughout the optimization process.
Time adapted DMOC is based on a discretization of Hamilton’s principle applied
to the time adapted Lagrangian of the optimal control problem. Variations of the
discrete action of the optimal control Lagrangian lead to discrete Euler-Lagrange
equations that can be enforced as constraints for a boundary value problem. This
new form of DMOC leads to the accurate and efficient solution of optimal control
problems with highly nonlinear dynamics. Time adapted DMOC is tested on several
space trajectory problems including the elliptical orbit transfer in the 2-body
problem and the reconfiguration of a cubesat.
Charakterisierung von Oberflächenmarkern dendritischer Zellen unter der in-vitro-Stimulation mit Immunglobulinen im peripheren Blut von Patienten mit COPD
Creators: name: Didt, Janne
Publisher: name: Universität Rostock
Year: 2021
Subjects: subject: 610 Medical sciences Medicine

description: Diese klinisch-experimentelle Studie beschäftigt sich mit der Regulation der Immunglobulinrezeptoren auf dendritischen Zellen (DC) von Patienten mit COPD. Wir haben die Hypothese aufgestellt, dass eine erhöhte Expression des IgG - Rezeptors CD32 auf dendritischen Zellen über die Interaktion mit seinen Liganden Immunglobulin G und CRP eine pathogenetische Rolle bei der COPD spielen könnte, die sich nicht durch die veränderte Expression von bestimmten DC-Reifemarkern, sondern durch anderweitig veränderte funktionelle Kapazitäten der dendritischen Zellen, wie z.B. die Zytokinausschüttung, äußert.
Microscopic Structure of Magnetic Bions
Creators: name: Anber, Mohamed M.
name: Poppitz, Erich
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Magnetic bions---stable bound states of monopoles and twisted ("Kaluza-Klein") monopoles, carrying two units of magnetic charge---have been shown to be the leading cause of confinement and mass gap in four-dimensional gauge theories with massless adjoint fermions compactified on R**{1,2} x S**1, at least at small S**1. In this paper, we study in detail the bion mechanism and the scales involved for an SU(2) gauge group, using traditional QCD instanton methods. We represent the vacuum functional as the partition function of a bion-anti-bion plasma and obtain the next-to-leading dependence of the mass gap on the S**1 size L at fixed strong-coupling scale Lambda. We find that, at small Lambda x L, the mass gap is an increasing function of L for theories with four massless adjoint Weyl fermions, a case left undetermined by the previous leading-order analysis, and comment on the approach to R**4.
description: 29 pages, 4 figures
The politics of subsystems : agenda management and policy change in education
Creators: name: King, Conrad A.
Publisher: name: University of British Columbia
Year: 2018

description: Why is the policy status quo more resilient in some contexts than others? What are the conditions by which policy instruments can be transformed, in lieu of other degrees of change? I argue that the properties of policy design institutions have played an important role in determining the degree of policy change during recent reforms of public education in Germany and France, following from ‘PISA shocks’ in each country. The OECD’s Program for International Student Assessment (PISA) is a cross-national comparison of education systems that revealed unexpectedly poor results for Germany in 2001 and France in 2007. The subsequent (and surprising) policy change outcomes can be explained by examining sector-specific policy design institutions (i.e., policy subsystems). It is from analysis of subsystem politics in the education sector that I begin to develop an agenda-management model of policy change. More specifically, I found that the existence in Germany of a stable, consensus-oriented institution for education policy design – what I call a policy oligopoly – was critical for managing the reform agenda and for facilitating a transformation of policy instruments in lieu of greater or lesser forms of change. Furthermore, the existence in France of a conflict-ridden subsystem – an unstable monopoly for policy design – resulted in a disorderly reform episode and eventually the obstruction of many of the proposed policy changes. The research involved a comparative process tracing of educational policy-making in Germany and France, involving 58 participant and expert interviews and an intensive analysis of primary documents and secondary materials. From this evidence, I describe different types of policy change involved in each case, explain the connection between subsystem politics and forms of policy change, and evaluate the plausibility of this agenda-management model when compared to more conventional explanations, such as policy internationalization or partisan-politics. The dissertation makes a number of contributions to the literature on change in public policy. It provides a novel account for how and why certain policy-making regimes facing acute external pressure can significantly change the instrumental logic of policy yet retain aspects of the political and policy status quo, while other regimes fail in this regard.
dc Transport of Composite Fermions in Weak Periodic Potentials
Creators: name: Smet, J. H.
name: Klitzing, Klaus von
name: Weiss, Dieter
name: Wegscheider, Werner
Publisher: name: Universität Regensburg
Year: 1998
Subjects: subject: 530 Physik
subject: 73.40.Hm, 73.50.Jt

description: dc transport through one- and two-dimensional periodic modulations of density has been investigated near half filling of the lowest Landau level. For both geometries, the modulation, which is rather weak for electrons at small magnetic fields, triggers an unexpectedly strong response for composite fermions. The dramatic effect observed in 1D gratings is best described as a large positive magnetoresistance emanating from the half filled state. 2D gratings display four peaks similar to dimensional resonances observed in antidot arrays despite the small modulation amplitude.
Environmental controls on hydrological processes in fen peatlands
Creators: name: Ahmad, Sate
Publisher: name: Universität Rostock
Year: 2021
Subjects: subject: 500 Natural sciences
subject: 550 Earth sciences

description: Over the last century, peatlands have undergone severe degradation. Nevertheless, the restoration of drained peatlands has gained much importance over the last decades. Hydrological processes are closely linked to soil properties and as such investigations of both water dynamics and soil properties are vital. The specific objectives are to evaluate (1) how long-term rewetting of drained fens alters the response of the water table to precipitation (2) to what extent rewetting changes how meteorological factors drive water table dynamics (3) whether microtopography controls peat properties.
Techniques and Technologies for Investigating the Interior Structure of Venus
Creators: name: Jackson, Jennifer M.
name: Cutts, James A.
Publisher: name: Keck Institute for Space Studies
Year: 2018

description: The goal of our program is to develop innovative techniques and technologies for investigating the interior structure of Venus. The KISS Technical Development Program has enabled major progress towards this end. The infrasound technique for seismic investigation of Venus has been firmly established as a credible approach for studying the interior of Venus. The study has also fostered a number of productive interdisciplinary collaborations that would not have been possible otherwise, including the genuine collaboration of the JPL team members with mineral physicists at Caltech. The shared goal of understanding the interior of Venus is within reach.
In-plane gates and nanostructures fabricated by direct oxidation of semiconductor heterostructures with an atomic force microscope
Creators: name: Held, R.
name: Vancura, T.
name: Heinzel, Thomas
name: Ensslin, Klaus
name: Holland, M.
name: Wegscheider, Werner
Publisher: name: Universität Regensburg
Year: 1998
Subjects: subject: 530 Physik

description: The surface of shallow Ga[Al]As heterostructures is locally oxidized with an atomic force microscope. The electron gas underneath the oxide is depleted. We demonstrate experimentally that these depleted regions of the two-dimensional electron gas can be made highly resistive at liquid nitrogen temperatures. Thus, local anodic oxidation of high electron mobility transistors with an atomic force microscope provides a novel method to define nanostructures and in-plane gates. Two examples, namely antidots and quantum point contacts as in-plane gate transistors have been fabricated and their performance at low temperatures is discussed.
Axial and electromagnetic observables of hyperons in 2-flavor chiral perturbation theory
Creators: name: Jiang, F. -J.
name: Tiburzi, B. C.
name: Walker-Loud, A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Two-flavor chiral expansions provide a useful perturbative framework to study hadron properties. Such expansions should exhibit marked improvement over the conventional three-flavor chiral expansion. Although in principle one can formulate two-flavor theories for the various hyperon multiplets, the nearness of kaon thresholds can seriously undermine the effectiveness of such two-flavor theories in practice. We investigate the importance of virtual kaon thresholds on hyperon properties, specifically their isovector axial charges and electromagnetic observables. In particular we uncover the underlying expansion parameter governing the description of virtual kaon thresholds. For spin-half hyperons, this expansion parameter is under theoretical control. As a result, the virtual kaon contributions are well described in the two-flavor theory by terms analytic in the pion mass-squared. For spin three-half hyperons, however, one is closer to the kaon production threshold, and the expansion parameter is not as small. Breakdown of $SU(2)$ chiral perturbation theory is shown to arise from a pole in the expansion parameter associated with the kaon threshold. We find that, despite the fact that higher-order corrections to the expansion parameter is necessary to ascertain whether the two-flavor theory of spin three-half hyperons remains perturbative, there is a useful perturbative expansion for isovector axial charges and magnetic moments of both spin-half and spin three-half hyperons.
description: 7 pages, talk given at the XXVIII International Symposium on Lattice Filed Theory, June 14-19,2010, Villasimius, Sardinia Italy
(1 1 0) oriented quantum wells and modulation-doped heterostructures for cleaved edge overgrowth
Creators: name: Wegscheider, Werner
name: Schedelbeck, Gert
name: Neumann, Richard
name: Bichler, Max
Publisher: name: Universität Regensburg
Year: 1998
Subjects: subject: Quantum wells; Photoluminescence
subject: 530 Physik

description: The dependence of the optical quality, i.e. the line width and homogeneity of (1 1 0) oriented quantum wells on the substrate temperature, the As pressure as well as on the AsImage species is studied by means of micro-photoluminescence. Molecular beam epitaxial growth using the AsImage dimer leads to a photoluminescence line width as narrow as 5.5 meV for 7 nm wide quantum wells compared to a value of 8 meV for the AsImage tetramer source. In addition to the small line widths which can be achieved using AsImage , quantum wells grown under these conditions are also superior to those using AsImage in terms of uniformity on a Image m length scale. In contrast, the peak mobility of a two-dimensional electron system located at a (1 1 0) oriented GaAs/AlGaAs heterointerface of Image cmImage V s is obtained for tetramer growth, while the use of AsImage degrades the electron mobility to values below 500 000 cmImage V s.
Beyond the spatio-temporal limits of atmospheric radars
Creators: name: Urco Cordero, Juan Miguel Edgar
Publisher: name: Universität Rostock
Year: 2020
Subjects: subject: 004 Data processing Computer sciences
subject: 550 Earth sciences

description: The Earth’s upper atmosphere (UA) is a highly dynamic region dominated by atmospheric waves and stratified turbulence covering a wide range of spatio-temporal scales. A comprehensive study of the UA requires measurements over a broad range of frequencies and spatial wavelengths, which are prohibitively costly. To improve the understanding of the UA, an investment in efficient and large observational infrastructures is required. This work investigates remote sensing techniques based on MIMO and inverse problems techniques to improve the capabilities of current atmospheric radars.
Confined Excitons in T-Shaped Quantum Wires
Creators: name: Glutsch, S.
name: Bechstedt, F.
name: Wegscheider, Werner
name: Schedelbeck, G.
Publisher: name: Universität Regensburg
Year: 1997
Subjects: subject: 530 Physik
subject: 71.35.±±y; 78.66.Fd; S7.12

description: The dependence of the exciton binding energy on the structural parameters in T-shaped quantum wires is studied numerically, including nonparabolicity and dielectric mismatch. The symmetric structure with pure AlAs barriers was found to give the highest exciton binding energy. Optimized asymmetric T-structures show a binding energy that is nearly constant in a large range of parameters. A large single-particle confinement does not necessarily lead to a large exciton binding energy. A weak correlation is observed between the maximum of the binding energy and the localization of the uncorrelated electron wave function.
A metamaterial having a frequency dependent elasticity tensor and a zero effective mass density
Creators: name: Milton, Graeme
name: Seppecher, Pierre
Publisher: name: arXiv
Year: 2011
Subjects: subject: Classical Physics (physics.class-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Within the context of linear elasticity we show that a two-terminal network of springs and masses, can respond exactly the same as a normal spring, but with a frequency dependent spring constant. As a consequence a network of such springs can have a frequency dependent effective elasticity tensor but zero effective mass density. The internal masses influence the elasticity tensor, but do not contribute to the effective mass density at any frequency.
description: 5 pages 1 figure
Strong magnetic field dependence of laser emission from quantum wires formed by cleaved edge overgrowth
Creators: name: Wegscheider, Werner
name: Pfeiffer, Loren N.
name: West, Kenneth W.
name: Littlewood, P.
name: Narayan, O.
name: Hagn, M.
name: Dignam, M. M.
name: Leibenguth, R. E.
Publisher: name: Universität Regensburg
Year: 1996
Subjects: subject: 530 Physik

description: Characteristics of GaAs/AlGaAs quantum wire (QWR) lasers are studied for the first time under strong magnetic fields up to 12T. The QWR laser diodes have been fabricated by the molecular beam epitaxy technique, we call “cleaved edge overgrowth” (CEO), which combines conventional layer growth along the [001] crystal axis with high-quality regrowth on the (110) crystal face formed by an in situ cleave. The active region of our lasers consists of atomically precise QWRs that form at the T-shaped intersections of 7 nm wide GaAs quantum wells (QWs). The origin of the quantum mechanical bound state is the relaxation of quantum well confinement at this intersection, which limits free carrier motion to one-dimension, i.e. to the line defined by the intersection of the two QWs. Applying a magnetic field parallel to the QWR axis we observe a pronounced increase in the laser emission intensity of more than one order of magnitude while the electrical diode characteristic remains unaffected. This effect mainly occurs for field strengths of 5 to 9 T where the magnetic length becomes comparable to the QWR dimensions. For a magnetic field direction oriented perpendicular to the QWR axis and parallel to the [110] overgrowth direction, a completely different behavior is observed. Although the absolute intensity increase is comparable to the previous case, the emitted intensity is already doubled for a magnetic field below 1 T, and magnetic fields exceeding 4 T show only a weak effect on the emitted intensity for this field direction. The origin of such a strong magnetic field dependence of the QWR emission, not previously observed for QW lasers, is discussed in the context of excitonic lasing.
Σεισμική αποτίμηση κτιρίου με χρήση των μεθόδων ανάλυσης των κανονιστικών κειμένων του EC 8 και του ΚΑΝ.ΕΠΕ
Creators: name: Ταβιανάτου Νίκη Σάββα
Publisher: name: Aristotle University of Thessaloniki
Year: 2023
Subjects: Σεισμική Αποτίμηση
Δυναμική Φασματική Ανάλυση
Ανελαστική Στατική Ανάλυση
Ευρωκώδικας 8
ΚΑΝ.ΕΠΕ
Seismic Performance Assessment
Dynamic Spectrum Analysis
Non-linear Static Analysis
Eurocode 8

description: Στόχος της παρούσας διπλωματικής εργασίας είναι η σεισμική αποτίμηση υφιστάμενης τριώροφης με υπόγειο κατασκευής από οπλισμένο σκυρόδεμα στην Θεσσαλονίκη, η οποία κατασκευάστηκε πριν από 80 και πλέον έτη, με χρήση των μεθόδων ανάλυσης που προτείνονται από τα σύγχρονα κανονιστικά κείμενα του EC 8 και του Ελληνικού Κανονισμού Επεμβάσεων (ΚΑΝ.ΕΠΕ). Οι μέθοδοι ανάλυσης που εφαρμόζονται είναι η Δυναμική Φασματική Ανάλυση και η Ανελαστική Στατική Ανάλυση (Pushover Analysis), οι οποίες εκτελούνται σύμφωνα με τις διατάξεις των ανωτέρω κανονιστικών κειμένων. Η επάρκεια της κατασκευής εξετάζεται για στάθμη επιτελεστικότητας Β «Σημαντικές Βλάβες». Για την προσομοίωση της γεωμετρίας της, των ιδιοτήτων των υλικών, των χαρακτηριστικών των διατομών και των επιβαλλόμενων φορτίσεων χρησιμοποιείται το λογισμικό SAP2000 v.23. Αρχικά εκτελείται η Δυναμική Φασματική Ανάλυση, πραγματοποιούνται οι έλεγχοι επάρκειας των δομικών στοιχείων δοκών και υποστυλωμάτων σε κάμψη και διάτμηση και παρουσιάζονται τα αποτελέσματα. Στην συνέχεια γίνεται τροποποίηση του προσομοιώματος προκειμένου να εκτελεστεί η Ανελαστική Στατική Ανάλυση (Pushover Analysis). Πραγματοποιούνται ξανά οι έλεγχοι επάρκειας των δομικών στοιχείων σε κάμψη και διάτμηση, παρουσιάζονται τα αποτελέσματα και καταγράφονται τα συμπεράσματα που προκύπτουν από την σύγκριση των δύο αναλύσεων
description: The purpose of this thesis is the seismic assessment of an existing three-storey reinforced concrete structure with basement in Thessaloniki, which was constructed more than 80 years ago, using the analysis methods proposed by the modern regulatory texts of Eurocode 8 and the Greek Intervention Regulation (KAN.EPE). The analysis methods applied are Dynamic Spectrum Analysis and Non-linear Static Analysis (Pushover Analysis), which are performed in accordance with the provisions of the above mentioned regulatory texts. The adequacy of the structure is examined for performance level B 'Significant Damage'. SAP2000 v.23 software is used to simulate the geometry of the structure, material properties, section characteristics and applied loads. Firstly, the Dynamic Spectrum Analysis is performed, the checks of the adequacy of the structural elements in bending and shear are carried out and the results are presented. The model is then modified in order to perform the Pushover Analysis. The bending and shear adequacy checks of the structural elements are performed again, the results are presented, and the conclusions drawn from the comparison of the two analyses are recorded
Atomically Precise GaAs/AlGaAs Quantum Dots Fabricated by Twofold Cleaved Edge Overgrowth
Creators: name: Wegscheider, Werner
name: Schedelbeck, G.
name: Abstreiter, Gerhard
name: Rother, M.
name: Bichler, Max
Publisher: name: Universität Regensburg
Year: 1997
Subjects: subject: 530 Physik
subject: 73.20.Dx, 73.20.At, 78.55.Cr

description: The formation of a 7×7×7 nm3 size GaAs quantum dot (QD) at the intersection of three quantum wells is demonstrated for the first time. Intense radiative recombination between zero-dimensional states in the QDs is clearly identified by microscopic photoluminescence ( μPL). In contrast to the inhomogeneously broadened quantum well and quantum wire signals originating from the complex twofold cleaved edge overgrowth structure, the strongly spatially localized QD response is characterized by spectrally sharp lines in μPL excitation spectra with a linewidth below 70 μeV.
Unveiling the interaction profile of rosmarinic acid and its bioactive substructures with serum albumin
Creators: name: Papaemmanouil, Christina
name: Chatziathanasiadou, Maria V.
name: Chatzigiannis, Christos
name: Chontzopoulou, Eleni
name: Mavromoustakos, Thomas
name: Grdadolnik, Simona Golic
name: Tzakos, Andreas G.
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Biophysics
subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
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: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences

description: Rosmarinic acid, a phytochemical compound, bears diverse pharmaceutical profile. It is composed by two building blocks: caffeic acid and a salvianic acid unit. The interaction profile, responsible for the delivery of rosmarinic acid and its two substructure components by serum albumin remains unexplored. To unveil this, we established a novel low-cost and efficient method to produce salvianic acid from the parent compound. To probe the interaction profile of rosmarinic acid and its two substructure constituents with the different serum albumin binding sites we utilised fluorescence spectroscopy and competitive saturation transfer difference NMR experiments. These studies were complemented with transfer NOESY NMR experiments. The thermodynamics of the binding profile of rosmarinic acid and its substructures were addressed using isothermal titration calorimetry. In silico docking studies, driven by the experimental data, have been used to deliver further atomic details on the binding mode of rosmarinic acid and its structural components.
The Origin of Dust in the Early Universe: Probing the Star Formation History of Galaxies by their Dust Content
Creators: name: Dwek, Eli
name: Cherchneff, Isabelle
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Two distinct scenarios for the origin of the ~ 4 \times 10^8 M\odot of dust observed in the high-redshift (z = 6.4) quasar J1148+5251 have been proposed. The first assumes that this galaxy is much younger than the age of the universe at that epoch so that only supernovae (SNe) could have produced this dust. The second scenario assumes a significantly older galactic age, so that the dust could have formed in lower-mass asymptotic giant branch (AGB) stars. Presenting new integral solutions for the chemical evolution of metals and dust in galaxies, we offer a critical evaluation of these two scenarios, and observational consequences that can discriminate between the two. We show that AGB stars can produce the inferred mass of dust in this object, however, the final mass of surviving dust depends on the galaxy's star formation history (SFH). In general supernovae cannot produce the observed amount of dust unless the average SN event creates over ~ 1 M\odot of dust in its ejecta. However, special SFHs can be constructed in which SNe can produce the inferred dust mass with a reasonable average dust yield of ~ 0.15 M\odot. The two scenarios propose different origins for the galaxy's spectral energy distribution, different star formation efficiencies and stellar masses, and consequently different comoving number densities of J1148+5251-type hyperluminous infrared (IR) objects. The detection of diagnostic mid-IR fine structure lines, and more complete surveys determining the comoving number density of these objects can discriminate between the two scenarios.
description: Accepted for publication in The Astrophysical Journal. 32 pages including 6 figures