cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Sharp doping profiles and two-dimensional electron systems in Ge based heterostructures
Creators: name: Wilhelm, J.
name: Wegscheider, Werner
name: Abstreiter, Gerhard
Publisher: name: Universität Regensburg
Year: 1992
Subjects: subject: 530 Physik

description: Sharp Sb doping profiles have been achieved in Ge by low temperature molecular beam epitaxy on Ge(001) substrates. The strong tendency of Sb to segregate on the growing Ge surface has been overcome by large substrate temperature modulations during growth. In this way homogeneous doping profiles with a free carrier concentration up to 1.5 × 1020 cm−3 and δ-doped Ge layers with a sheet carrier density of 3 × 1013 cm−2 and a doping profile width of less than 6 nm have been achieved. Selective doping of a Si3Ge3/Ge(001) heterostructure leads to a two-dimensional electron gas in the strained Si3Ge3 superlattice quantum well. We have characterized such systems by Hall and Shubnikov-de Haas measurements and found low temperature electron mobilities up to 6800 cm2/V s and sheet carrier concentrations of 2 × 1012 cm−2.
Direct Determination of Electron-Phonon Coupling Matrix Element in a Correlated System
Creators: name: Qin, Huajun
name: Shi, Junren
name: Cao, Yanwei
name: Wu, Kehui
name: Zhang, Jiandi
name: Plummer, E. W.
name: Wen, J.
name: Xu, Z. J.
name: Gu, G. D.
name: Guo, Jiandong
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: High-resolution electron energy loss spectroscopy measurements have been carried out on an optimally doped cuprate Bi2Sr2CaCu2O8+δ. The momentum-dependent linewidth and the dispersion of an A1 optical phonon are obtained. Based on these data as well as the detailed knowledge of the electronic structure from angle-resolved photoemission spectroscopy, we develop a scheme to determine the full structure of electron-phonon coupling for a specific phonon mode, thus providing a general method for directly resolving the EPC matrix element in systems with anisotropic electronic structures.
Single-crystal Sn/Ge superlattices on Ge substrates: Growth and structural properties
Creators: name: Wegscheider, Werner
name: Eberl, Karl
name: Menczigar, U.
name: Abstreiter, Gerhard
Publisher: name: Universität Regensburg
Year: 1990
Subjects: subject: 530 Physik

description: Short-period strained-layer alpha-Sn/Ge superlattices lattice matched to Ge(001) substrates have been synthesized for the first time. The thin, tetragonally distorted alpha-Sn layers are stabilized by a modified molecular beam epitaxy technique with large modulation of substrate temperature during growth. Optimization of growth conditions is achieved via in situ Auger electron spectroscopy and low-energy electron diffraction. This new kind of strained-layer superlattice is characterized by transmission electron microscopy, x-ray diffraction, and Raman scattering. Distinct superlattice effects are observed in the structural and phonon properties of the samples.
Symmetry properties of short period (001) Si/Ge superlattices
Creators: name: Eberl, Karl
name: Wegscheider, Werner
name: Abstreiter, Gerhard
name: Cerva, H.
name: Oppolzer, H.
Publisher: name: Universität Regensburg
Year: 1991
Subjects: subject: 530 Physik

description: Depending on the composition of [001] oriented short period SimGen superlattices (m monolayers Si/n monolayers Ge) there are six different space groups. In case of m+n odd the microscopic periodicity is doubled to 2(m+n) monolayers due to the tetrahedral bonding. We prepared several superlattices namely Si2Ge3, Si3Ge3 and Si4Ge6 with low temperature molecular beam epitaxy. Using selected area diffraction in the transmission electron microscope we found the microscopic periodicity of 10 monolayers for Si2Ge3 and Si4Ge6. For Si3Ge3 the vertical periodicity is six monolayers.
Transport in gapped bilayer graphene: the role of potential fluctuations (Supplementary Information)
Creators: name: Zou, K.
name: Zhu, J.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Online Supplementary Information for arXiv:1008.0783
description: Online Supplementary Information for arXiv:1008.0783, to appear in Physical Review B: Rapid Comm
Transmission electron microscopy of short-period Si/Ge strained-layer superlattices on Ge substrates
Creators: name: Wegscheider, Werner
name: Eberl, Karl
name: Cerva, H.
name: Oppolzer, H.
Publisher: name: Universität Regensburg
Year: 1989
Subjects: subject: 530 Physik

description: Structural investigations of high quality Si/Ge strained-layer superlattices (SLSs) on [001] oriented Ge substrates prepared by molecular beam epitaxy are presented. Cross-sectional transmission electron microscopy reveals that a defect-free superlattice is achieved for a structure composed of a 20-period sequence of 3 monolayers (ML) Si and 9 ML Ge. High-resolution lattice images and electron diffraction patterns show that the whole structure is matched to the Ge substrate. Experimental values for the tetragonal deformation of the Si layers within the SLS are in good agreement with theory. An equivalent sample containing 120 periods exceeds the critical thickness for pseudomorphic growth of the SLS and shows the formation of twin lamellae. Applied Physics Letters is copyrighted by The American Institute of Physics.
title: Universität Kassel, Vorlesungsverzeichnis WiSe 2017 / 2018
Creators: name: (:Unkn) Unknown
Publisher: name: Universität Kassel
Year: 2017
Subjects: subject: 350
subject: 370
subject: Universität Kassel
subject: Vorlesungsverzeichnis

description: PDF zum Online-Vorlesungsverzeichnis
Impact of TP53 gene variants on prognosis and survival of childhood acute lymphoblastic leukemia
Creators: name: Firtina, Sinem
name: Erbilgin, Yucel
name: Ng, Ozden Hatirnaz
name: Karaman, Serap
name: Karakas, Zeynep
name: Celkan, Tulin Tiraje
name: Gelen, Sema Aylan
name: Yildirmak, Yildiz
name: Ozbek, Ugur
name: Sayitoglu, Muge
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Medicine
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: Cancer
subject: Hematology
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: The tumor suppressor protein 53 (TP53) gene is one of the most studied genes in cancer. Although TP53 variants are rare events in acute leukemia, recent observations showed that relapse samples might harbor TP53 variants. Here, we aimed to determine TP53 variants (hotspot region, exon 4–11) in childhood acute lymphoblastic leukemia (B and T-ALL) patients (n = 94) including diagnostic-relapse pairs (n = 15) by amplicon sequencing and evaluate the clinical impact of these variants. In total, nine different (E298*, R283C, R273H, L252F, C229F, I195T, E286G, c.955_956insC, and c.920-1G > C) variants were identified in 17 (18%) childhood ALL patients. c.(920-1G> C) splice site variant and c.(955_956insC) insertion were reported for the first time. In diagnose-relapse pair samples, we identified acquired and/or loss of TP53 variants in the samples at the time of relapse. TP53 variants were found to be more common in T-ALL (37%) than in B-ALL patients (9%). Pathogenic TP53 variants were associated with a shorter overall survival time (p = 0.001).TP53 variants were found to be associated with inferior outcomes in our cohort and can be an independent risk factor for poor prognosis in childhood acute leukemia patients. Identification of low-frequent variants with next-generation sequencing approaches enables better knowledge of the clonal dynamics of ALL.
Depth Dependence of the Structural Phase Transition of SrTiO_3 Studied with β-NMR and Grazing Incidence X-ray Diffraction
Creators: name: Salman, Z.
name: Smadella, M.
name: MacFarlane, W. A.
name: Patterson, B. D.
name: Willmott, P. R.
name: Chow, K. H.
name: Hossain, M. D.
name: Saadaoui, H.
name: Wang, D.
name: Kiefl, R. F.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present an investigation of the near-surface tetragonal phase transition in SrTiO3, using the complementary techniques of beta-detected nuclear magnetic resonance and grazing-incidence X-ray diffraction. The results show a clear depth dependence of the phase transition on scales of a few microns. The measurements support a model in which there are tetragonal domains forming in the sample at temperatures much higher than the bulk phase transition temperature. Moreover, we find that these domains tend to form at higher temperatures preferentially near the free surface of the crystal. The details of the tetragonal domain formation and their depth/lateral dependencies are discussed.
description: Accepted for publication in Phys. Rev. B
An analysis of the proposed regulatory reforms for derivatives trading in Canada
Creators: name: Barta, Winston Victor
Publisher: name: University of British Columbia
Year: 2018

description: Since the global financial crisis of 2008, policy makers have been working to develop laws that will increase the financial systems’ transparency and resiliency while maintaining fairness and efficiency. At the heart of the market infrastructure reform initiatives are measures aimed squarely at the regulation of derivatives. This paper aims to provide a high level review of some of the new Canadian legislation targeting derivatives. It examines the motivations for regulating the use of these sophisticated financial products as well as the complexity of legislating within a country whose securities laws have long been managed at the provincial level. The paper offers suggestions on the important features and direction of the law in this area. The analysis leads to several conclusions regarding the developing legislation. Central counterparty clearing and margin requirements are important regulatory initiatives to mitigate counterparty credit risk, being the key way in which derivatives contribute to systemic risk. Central clearing, however, cannot be relied upon as the primary guard against the spread of systemic risk by derivatives markets. This responsibility should remain in the hands of vigilant regulators. This leads to the key conclusion, being the need for effective management, at the national level, of the systemic risk created by derivatives markets. A robust national regulator would not only have access to real-time trade reporting data but would also monitor movements within defined sectors, like housing for example, to be alert to any risk accumulation within an overheated market. In addition, the analysis concludes that the use of investor sophistication as a regulatory trigger, as currently part of the proposed market conduct rules, is a valuable delimiter of differing levels of required disclosure. The research also concludes that investor sophistication could be a valuable tool to manage the nexus of sophisticated derivatives products entering the retail economy by potentially limiting their availability based on a combination of product complexity and investor sophistication.
High angular resolution observation of the Sunyaev-Zel'dovich effect in the massive z=0.83 cluster ClJ0152-1357
Creators: name: Massardi, M.
name: Ekers, R. D.
name: Ellis, S. C.
name: Maughan, B.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: X-ray observations of galaxy clusters at high redshift (z>0.5) indicate that they are more morphologically complex and less virialized than those at low-redshift. We present the first subarcmin resolution at 18 GHz observations of the Sunyaev-Zel'dovich (SZ) effect for ClJ0152-1357 using the Australia Telescope Compact Array. ClJ0152-1357 is a massive cluster at redshift z=0.83 and has a complex structure including several merging subclumps which have been studied at optical, X-ray, and radio wavelengths. Our high-resolution observations indicate a clear displacement of the maximum SZ effect from the peak of X-ray emission for the most massive sub-clump. This result shows that the cluster gas within the cluster substructures is not virialised in ClJ0152-1357 and we suggest that it is still recovering from a recent merger event. A similar offset of the SZ effect has been recently seen in the `bullet cluster' by Malu et al. This non-equilibrium situation implies that high resolution observations are necessary to investigate galaxy cluster evolution, and to extract cosmological constraints from a comparison of the SZ effect and X-ray signals.
description: 5 pages, 4 figures, submitted to ApJL
Weak localization and transport gap in graphene antidot lattices
Creators: name: Eroms, Jonathan
name: Weiss, Dieter
Publisher: name: Universität Regensburg
Year: 2009
Subjects: subject: 530 Physik

description: We fabricated and measured antidot lattices in single layer graphene with lattice periods down to 90 nm. In large-period lattices, a well-defined quantum Hall effect is observed. Going to smaller antidot spacings, the quantum Hall effect gradually disappears, following a geometric size effect. Lattices with narrow constrictions between the antidots behave as networks of nanoribbons, showing a high-resistance state and a transport gap of a few mV around the Dirac point. We observe pronounced weak localization in the magnetoresistance, indicating strong intervalley scattering at the antidot edges. The area of phase-coherent paths is bounded by the unit cell size at low temperatures, so each unit cell of the lattice acts as a ballistic cavity.
The pricing of temperature futures at the Chicago Mercantile Exchange
Creators: name: Dorfleitner, Gregor
name: Wimmer, Maximilian
Publisher: name: Universität Regensburg
Year: 2010
Subjects: subject: Weather derivatives; Index modeling; Weather forecast; Futures pricing; Trading strategy
subject: 330 Wirtschaft
subject: C53
subject: G13
subject: G29
subject: Q54

description: This paper analyzes observed prices of U.S. temperature futures at the Chicago Mercantile Exchange (CME). Results show that an index modeling approach without detrending captures the prices exceptionally well. Moreover, weather forecasts significantly influence prices up to 11 days ahead. It is shown that valuations of temperature futures relying on a model without detrending yield biased valuations by overpricing winter contracts and underpricing summer contracts. Several trading strategies are devised to exploit the mispricing observed at the CME and to demonstrate that speculating on temperature futures can not only generate high overall returns, but also perform well on a risk-adjusted basis.
Improvement of structural properties of Si/Ge superlattices
Creators: name: Eberl, Karl
name: Friess, H.
name: Wegscheider, Werner
name: Menczigar, U.
name: Abstreiter, Gerhard
Publisher: name: Universität Regensburg
Year: 1989
Subjects: subject: 530 Physik

description: Short-period Si/Ge strained-layer superlattices are grown by molecular beam epitaxy (MBE) on Si(100) and Ge(100) substrates. Low-energy electron diffraction and Auger electron spectroscopy are performed between growth intervals, to obtain structural and compositional information. Raman spectroscopy and transmission electron microscopy are used for ex-situ characterization. Different buffer layers, varying in thickness and composition, are investigated to minimize the defect density in a symmetrically strained Si/Ge superlattice and to optimize the superlattice quality for various strain adjustments. The maximum thickness for two-dimensional and lattice-matched growth of the individual silicon and germanium layers on a strain-symmetrizing buffer are discussed. In addition, the thermal stability of short-period Si/Ge superlattices is studied as a function of strain distribution.
Space-Time from the spectral point of view
Creators: name: Chamseddine, Ali H.
name: Connes, Alain
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We develop the spectral point of view on geometry based on the formalism of quantum physics. We start from the simple physical question of specifying our position in space and explain how the spectral geometric point of view provides a new paradigm to model space-time whose fine structure can be encoded by a finite geometry. The classification of the irreducible finite geometries of KO-dimension 6 singles out a ``symplectic--unitary" candidate F, which when used as the fine texture of space-time delivers from pure gravity on M x F the Standard Model coupled to gravity and, once extrapolated to unification scale, gives testable predictions.
description: 19 pages. To appear in the Proceedings of the 12th Marcel Grossmann meeting
Group IV element (Si, Ge and α-Sn) superlattices — low temperature MBE
Creators: name: Eberl, Karl
name: Wegscheider, Werner
name: Abstreiter, Gerhard
Publisher: name: Universität Regensburg
Year: 1991
Subjects: subject: 530 Physik

description: Si/Ge and Sn/Ge heterostructures and short-period superlattices are grown by a modified molecular beam epitaxy (MBE) technique on Si and Ge substrates. Low energy electron diffraction and Auger electron spectroscopy are used in order to optimize the growth conditions with respect to interface roughness, segregation and intermixing. Transmission electron micrographs reveal that the interface quality of short period superlattices is improved by substrate temperature modulation during deposition. For Si/Ge superlattices we use a temperature range between 250 and 400°C. However, due to the extreme tendency of Sn to segregate on the film surface, it is necessary to further decrease the substrate temperature during overgrowth of the Sn layers. The optimized growth conditions for high-quality Sn/Ge superlattices were found to be in the temperature range between 45 and 300°C. It is demonstrated that low temperatures, low growth rates, and temperature variations during deposition of the individual layers in MBE open the possibility to synthesize structures far beyond thermodynamic equilibrium conditions.
On the Formation of Double White Dwarfs through Stable Mass Transfer and a Common Envelope
Creators: name: Woods, T. E.
name: Ivanova, N.
name: van der Sluys, M.
name: Chaichenets, S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Although several dozen double white dwarfs (DWDs) have been observed, for many the exact nature of the evolutionary channel(s) by which they form remains uncertain. The canonical explanation calls for the progenitor binary system to undergo two subsequent mass-transfer events, both of which are unstable and lead to a common envelope (CE). However, it has been shown that if both CE events obey the standard alpha-prescription (parametrizing energy loss), it is not possible to reproduce all of the observed systems. The gamma-prescription was proposed as an alternative to this description, instead parametrizing the fraction of angular momentum carried away in dynamical-timescale mass loss. In this paper, we analyze simultaneous energy and angular-momentum conservation, and show that the gamma-prescription cannot adequately describe a CE event for an arbitrary binary, nor can the first phase of mass loss always be understood in general as a dynamical-timescale event. We consider in detail the first episode of mass transfer in binary systems with initially low companion masses, with a primary mass in the range 1.0--1.3 solar masses and an initial mass ratio between the secondary and primary stars of 0.83--0.92. In these systems, the first episode of dramatic mass loss may be stable, non-conservative mass transfer. This strips the donor's envelope and dramatically raises the mass ratio; the considered progenitor binary systems can then evolve into DWDs after passing through a single CE during the second episode of mass loss. We find that such a mechanism reproduces the properties of the observed DWD systems which have an older component with less than approximately 0.46 solar masses and mass ratios between the younger and older WDs greater than 1.
description: Submitted to ApJ, ApJ format. 15 pages, 17 figures, 2 tables
Hole-intersubband excitations and luminescence transitions in p-doped GaAs---AlGaAs multiple quantum wells
Creators: name: Dahl, M.
name: Ils, P.
name: Kraus, J.
name: Müller, B.
name: Schaack, G.
name: Schüller, Christian
name: Ebeling, J. K.
name: Weimann, G.
Publisher: name: Universität Regensburg
Year: 1991
Subjects: subject: 530 Physik

description: We have performed resonant Raman spectroscopy on two p-type modulation-doped GaAs---AlGaAs multiple quantum well structures with well widths dW = 10 nm and dW = 30 nm. With the frequency of the dyelaser nearly in resonance with the energy difference between conduction and valence band states of the same subband quantum number n we simultaneously observe Raman intensity of hole intersubband transitions to primarily heavy hole subbands hn and luminescence from the excited conduction subbands cn. In both samples one of the intersubband transitions is coupling to the quantum well LO-phonon. Beside these interacting excitations a second quantum well, non-coupling LO-phonon mode exists, which in our opinion is of shorter wavelength type than the coupling one. The comparison of the maxima of its scattering cross section with the resonances of the hole-intersubband transitions yields information about the intermediate states of the scattering process and confirms calculations of Zhu et al. [ 7 ], which are performed for a sample with a well width of 10.2 nm.
Polar branches of stellar activity waves: dynamo models and observations
Creators: name: Moss, D.
name: Sokoloff, D.
name: Lanza, A. F.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: [Abridged abstract:] Stellar activity data provide evidence of activity wave branches propagating polewards rather than equatorwards (the solar case). Stellar dynamo theory allows polewards propagating dynamo waves for certain governing parameters. We try to unite observations and theory, restricting our investigation to the simplest mean-field dynamo models. We suggest a crude preliminary systematization of the reported cases of polar activity branches. Then we present results of dynamo model simulations which contain magnetic structures with polar dynamo waves, and identify the models which look most promising for explaining the latitudinal distribution of spots in dwarf stars. Those models require specific features of stellar rotation laws, and so observations of polar activity branches may constrain internal stellar rotation. Specifically, we find it unlikely that a pronounced poleward branch can be associated with a solar-like internal rotation profile, while it can be more readily reproduced in the case of a cylindrical rotation law appropriate for fast rotators. We stress the case of the subgiant component of the active close binary HR 1099 which, being best investigated, presents the most severe problems for a dynamo interpretation. Our best model requires dynamo action in two layers separated in radius. Observations of polar activity branches provide valuable information for understanding stellar activity mechanisms and internal rotation, and thus deserve intensive observational and theoretical investigation. Current stellar dynamo theory seems sufficiently robust to accommodate the phenomenology.
description: 13 pages, 10 figures, 4 tables, accepted by Astronomy and Astrophysics
D6.3 Final report on the outcome of the awareness raising workshops
Creators: name: Inkret, Ana
name: Allison, Rosie
name: Brvar, Irena Vipavc
Publisher: name: Zenodo
Year: 2021

description: The awareness raising workshops were part of the SSHOC stakeholder engagement and awareness raising activities, aimed towards fostering communities in the Social Sciences and Humanities. The aim of the workshops was to raise awareness on SSHOC services and tools in development, gather feedback from various participants (e.g., data producers, data users, data experts, researchers, research librarians, secure data facility professionals, policy makers and civil society), and to inform project work based on the received feedback. Awareness workshops introduced SSHOC services and tools that were still under development and were therefore a way to maximise active contribution of the Social Sciences and Humanities (SSH) communities in the project. The content of the workshops was delivered by task partners and invited experts, while task 6.2 “Fostering Communities: Engaging New & Existing Users” provided communicational and technical support, assisted moderators in facilitating the discussions, and applied a standardized workflow to document the events. After the start of the COVID-19 pandemic, the workshops were adapted to take place online, while keeping the interactive elements and more extensive character of a workshop, as compared to webinars. The awareness raising workshops comprised a total of 9 events: LR4SSHOC: LREC2020 workshop about Language Resources for the SSH Cloud Agile Development of the SSH Open Marketplace: User Workshop, 30 June 2020 SSHOC Considerations for the Vocabulary Platforms, 6 November 2020 SSHOC Speech-to-text Workshop - Linking Social Survey and Linguistic Infrastructures Through Speech Interviews, 16April 2021 SSHOC Archaeological Case Study Workshop - The Roman Theatre in Catania from Survey to Interactive 4D Visualisation, 25 May 2021 SSHOC Dataverse Translation Workshop, 2 June 2021 SSHOC Dataverse Translation follow-up event 1, 8 September 2021 SSHOC Workshop: Providing canonical training materials for secure data facility professionals, 21 September 2021 SSHOC Dataverse Translation follow-up event 2, 7 December 2021 The awareness workshops were a successful format for the introduction of SSHOC developments and interaction with the relevant audiences. The guiding principle of the workshops was to present the work that was still in progress, which meant that the organisers were able to receive valuable feedback from the participants that could be applied to future work. For the SSH communities, the awareness workshops were an opportunity to engage with the developers of innovative products, learn of the latest progress in their fields, and contribute to the development of SSHOC services and tools.
The coupling of intersubband transitions and the quantum-well LO phonon in p-doped GaAs-GaAlAs multiple-quantum wells
Creators: name: Kraus, J.
name: Ils, P.
name: Schüller, Christian
name: Schaack, G.
name: Ebeling, J. K.
name: Schlapp, W.
name: Weimann, G.
Publisher: name: Universität Regensburg
Year: 1991
Subjects: subject: 530 Physik

description: The authors have applied resonant Raman spectroscopy to two p-type modulation-doped GaAs-GaAlAs multiple-quantum wells (MQW) with well widths dW=10 and 30 nm. In both samples one of the hole intersubband transitions observed is coupling to the quantum-well LO (longitudinal optical) phonon. The influence of an external magnetic field on this coupling phenomenon was investigated. A shift of the intersubband transition energy with excitation energy due to well width fluctuations results in an anticrossing of the two branches of the coupled modes. From the strength of the coupling as well as from the small depolarization shift of the intersubband transitions, the conclusion must be drawn that depolarization field effects are of low importance in p-doped MQW structures. The coexistence of a non-interacting quantum-well LO phonon is discussed in detail.
A regulatory mechanism of zinc homeostasis involving the mediator subunit MDT-15 and the transcription factor HIZR-1
Creators: name: Shomer, Naomi
Publisher: name: University of British Columbia
Year: 2019

description: Zinc is a metal that is essential for cell function as it plays important catalytic and structural roles in many proteins; however, excess zinc causes cell stress. Cadmium has similar chemical properties as zinc but is toxic and not required in biological systems. To maintain homeostasis, the levels of zinc detoxification genes are modulated through transcriptional regulation, which allows organisms to adapt to environmental changes. The key players in transcriptional regulation are Transcription Factors (TF), regulatory DNA elements, and coregulators such as the Mediator complex. Mediator subunit MDT-15 is required for the regulation of stress response genes in Caenorhabditis elegans, including zinc responsive genes. However, MDT-15’s physiological role and its regulatory partners in zinc homeostasis and cadmium stress response remain unknown. In this study, I investigated which TFs collaborate with MDT-15 to regulate zinc homeostasis and cadmium stress response genes, and I also examined its physiological role in zinc homeostasis. I used a fusion of the promoter of the zinc and cadmium responsive gene cdr-1 to Green Fluorescent Protein (GFP) and real-time PCR analysis as sensitive readouts to study metal response mechanisms. I found that cdr-1 induction by zinc and cadmium depends on Mediator subunits mdt-15 and cdk-8, and the TFs high zinc activated nuclear receptor-1 (hizr-1) and elt-2. Using genetic interaction studies, I found that HIZR-1 and MDT-15 function is codependent, and showed, using the yeast-two-hybrid system, that the two proteins interact physically. Interestingly, this physical association was enhanced by micromolar zinc and cadmium. To assess zinc storage, I studied the gut granules of C. elegans, which store and replenish zinc to maintain homeostasis, and found storage defects in mdt-15 and hizr-1 mutants. Lastly, I explored the regulatory conservation of this regulatory mechanism. The Insulin Secretory Granules in pancreatic β-cells require appropriate amounts of zinc to crystallize insulin. Using mice lacking the mdt-15 ortholog Med15 in the β-cells, I found that Med15 is required to express Slc30a8, the ortholog of the mdt-15-regulated zinc transporter cdf-2. Collectively, my data show that mdt-15 and hizr-1 cooperate to regulate metal detoxification genes and zinc storage, through a mechanism that possibly is conserved.
Spin-and Charge-Density Excitations in Quantum Dots: A Raman Study
Creators: name: Schüller, Christian
name: Steinebach, Christoph
name: Heitmann, Detlef
Publisher: name: Universität Regensburg
Year: 2001
Subjects: subject: A. Heterojunctions; A. Nanostructures; D. Electron–electron interactions; E. Inelastic light scattering
subject: 530 Physik
subject: 73.20.Dx; 73.20.Mf; 78.30.−j; 78.66.Fd

description: In this article we review our recent experimental and theoretical investigations of electronic excitations in GaAs–AlGaAs quantum dots. In the experimental structures we have observed collective spin- (SDE) and charge-density excitations (CDE), and, under conditions of extreme resonance, excitations which can be attributed to nearly unrenormalized single-particle-like transitions (SPE). We compare our experimental results to a theory based on the time-dependent local-density approximation (TDLDA) concerning (i) parity selection rules and (ii) conditions when SPE occur in the spectra. This shows that only a theory which takes into account the resonance enhancements mediated by the valence band states can qualitatively reproduce the experimental findings. To get a deeper understanding of the character of the SPE, we present an intriguing comparison of Kohn–Sham calculations with results of an exact treatment by numerical diagonalization. We demonstrate that even for six electrons per quantum dot, SPE can be expected.
UTILIZATION OF ACUTE CARE NURSE PRACTITIONERS IN THE EMERGENCY DEPARTMENT
Creators: name: Gantioque, Raymund Galoyo
Publisher: name: Zenodo
Year: 2014

description: Even with the passing of new legislation relative to health care, it seems likely that emergency departments (ED) will continue to see large, increasing patient volumes. With the Patient Protection and Affordable Act (PPACA), there is anticipated influx of patients to the healthcare arena and consequently the ED. Improving triage, treatment protocols, and systems currently in place could reduce the strain of waiting in EDs and increase patient satisfaction. Like many modern EDs in the United States, the department at a large Catholic based southern California hospital (henceforth, “The Hospital”) has experienced significant increases in patient numbers over the past 10 years; it is anticipated this upward trend in patient volume will continue into the future. After reviewing the literature and critically observing the processes in The Hospital ED and several other EDs the outcomes of this project are a recommended new standard order set for the ED and a set of recommendations for personnel and process changes that will improve the throughput of the ED. The utilization of acute care nurse practitioners (ACNP) as part of an ED triage team is one such change. Other recommendations are using a pivot nurse, doing abbreviated triage, and having medical screening evaluations done and initial orders written in the triage area when all ED beds are full. Improving multiple aspects of the ED’s functioning, specifically, the front-end throughput, patient satisfaction, and federal metric scores.
Raman Spectroscopy of Quantum Wires and Dots: Magnetoplasmons and Edge-Spin-Density Modes
Creators: name: Schüller, Christian
Publisher: name: Universität Regensburg
Year: 1998
Subjects: subject: Quantum wires; Quantum dots; Electronic excitations; Raman spectroscopy
subject: 530 Physik

description: We review recent magneto-Raman experiments on electronic excitations in GaAs–AlGaAs quantum wires and dots. We observe simultaneously collective spin-density and charge-density excitations (SDEs and CDEs), and also single-particle-like excitations. In a magnetic field, the CDEs (magnetoplasmons) exhibit a complex anticrossing behavior, which, in quantum wires, strongly depends on the direction of lateral wave-vector transfer. In quantum dots, we observe a splitting of the lowest spin-density mode in a magnetic field, very similar to the splitting of the magnetoplasmons. The lower branch can be interpreted as an edge-spin-density mode, where the electrons move on skipping orbits around the edge of the dot. In a microscopic model, we can identify transitions between electronic shells, which contribute to the observed low-energy SDEs of the quasiatomic system.
description: Proceedings of the 10th International Winterschool on New Developments in Solid State Physics: New Frontiers in Low-Dimensional Physics, Mauterndorf, Austria
Άνθρωπος και η σωτηρία του κατά τον άγιο Γρηγόριο Νύσσης
Creators: name: Πουλάκης, Στέφανος Μιχαήλ
Publisher: name: Aristotle University of Thessaloniki
Year: 2023
Subjects: Άγιος Γρηγόριος Νύσσης
Άνθρωπος
Σωτηρία
Saint Gregory of Nyssa
Man
Salvation

description: Σκοπός της μεταπτυχιακής αυτής εργασίας ήταν να παρουσιαστεί και να εκδιπλωθεί η διδασκαλία του αγίου Γρηγορίου Νύσσης για τον άνθρωπο και τη σωτηρία του. Αρχικά εξετάστηκε το ιστορικό και θεολογικό πλαίσιο της εποχής του αγίου Γρηγορίου Νύσσης, καθώς επίσης και η ζωή και το έργο του. Στη συνέχεια παρουσιάστηκε η διδασκαλία του για το θέμα της δημιουργίας και της πτώσης του ανθρώπου. Ακολούθως, έγινε εκτενής αναφορά στη διδασκαλία του για το θέμα της Ενσάρκωσης του Θεού, καθώς επίσης και για το πρόσωπο του Χριστού σε συνάρτηση με το μυστήριο της παρθενίας της Θεοτόκου. Τέλος, αναπτύχθηκε η διδασκαλία του ιερού πατρός για το θέμα της σωτηρίας του ανθρώπου και του τρόπου με τον οποίο επιτυγχάνεται αυτή.
description: The purpose of this master's thesis was to present and unfold the teaching of saint Gregory of Nyssa on man and his salvation. First, the historical and theological context of the era of Saint Gregory of Nyssa was examined, as well as his life and work. Then his teaching on the subject of the creation and fall of man was presented. Next, extensive reference was made to his teaching on the subject of the Incarnation of God, as well as on the person of Christ in connection with the mystery of the virginity of the Mother of God. Finally, the holy father's teaching on the subject of man's salvation and the way in which it is achieved was developed.
Anatomy of neck configuration in fission decay
Creators: name: Patra, S. K.
name: Choudhury, R. K.
name: Satpathy, L.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The anatomy of neck configuration in the fission decay of Uranium and Thorium isotopes is investigated in a microscopic study using Relativistic mean field theory. The study includes $^{236}U$ and $^{232}Th$ in the valley of stability and exotic neutron rich isotopes $^{250}U$, $^{256}U$, $^{260}U$, $^{240}Th$, $^{250}Th$, $^{256}Th$ likely to play important role in the r-process nucleosynthesis in stellar evolution. Following the static fission path, the neck configurations are generated and their composition in terms of the number of neutrons and protons are obtained showing the progressive rise in the neutron component with the increase of mass number. Strong correlation between the neutron multiplicity in the fission decay and the number of neutrons in the neck is seen. The maximum neutron-proton ratio is about 5 for $^{260}$U and $^{256}$Th suggestive of the break down of liquid-drop picture and inhibition of the fission decay in still heavier isotopes. Neck as precursor of a new mode of fission decay like multi-fragmentation fission may also be inferred from this study.
description: 16 pages, 5 figures (Accepted)
CS Lines Profiles in Hot Cores
Creators: name: Bayet, E.
name: Yates, J.
name: Viti, S.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present a theoretical study of CS line profiles in archetypal hot cores. We provide estimates of line fluxes from the CS(1-0) to the CS(15-14) transitions and present the temporal variation of these fluxes. We find that \textit{i)} the CS(1-0) transition is a better tracer of the Envelope of the hot core whereas the higher-J CS lines trace the ultra-compact core; \textit{ii)} the peak temperature of the CS transitions is a good indicator of the temperature inside the hot core; \textit{iii)} in the Envelope, the older the hot core the stronger the self-absorption of CS; \textit{iv)} the fractional abundance of CS is highest in the innermost parts of the ultra-compact core, confirming the CS molecule as one of the best tracers of very dense gas.
description: 17 pages, 5 figures, 1 table, In press in ApJ
Hard- and soft-fermion-pole contributions to single transverse-spin asymmetry for Drell-Yan process
Creators: name: Kanazawa, Koichi
name: Koike, Yuji
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the single transverse-spin asymmetry for the Drell-Yan lepton pair production based on the twist-3 mechanism in the collinear factorization. We calculate all the hard-pole (HP) and the soft-fermion-pole (SFP) contributions to the single-spin-dependent cross section originating from the quark-gluon correlation functions in the transversely polarized nucleon in the leading order with respect to the QCD coupling constant. Combined with the soft-gluon-pole (SGP) contribution, this completes the corresponding twist-3 cross section. In the real photon limit, where all the HP contributions are transformed into the SFP contribution, we find that the SFP partonic hard cross section for the two independent quark-gluon correlation functions coincides in each scattering channel, as in the case of the inclusive light-hadron production. Our result enables one to extract the quark-gluon correlation functions from the forthcoming experiments at several facilities such as RHIC and J-PARC.
description: 11 pages, 5 figures
Transport through (Ga,Mn)As nanoislands: Coulomb blockade and temperature dependence of the conductance
Creators: name: Schlapps, Markus
name: Lermer, Teresa
name: Geissler, Stefan
name: Neumaier, Daniel
name: Sadowski, Janusz
name: Schuh, Dieter
name: Wegscheider, Werner
name: Weiss, Dieter
Publisher: name: Universität Regensburg
Year: 2009
Subjects: subject: Coulomb blockade, electric admittance measurement, gallium arsenide, galvanomagnetic effects, magnetisation, manganese compounds, semiconductor devices, spin valves, wide band gap semiconductors
subject: 530 Physik
subject: 75.50.Pp; 73.23.Hk; 73.63.Rt; 85.75.Mm

description: We report on magnetotransport measurements of nanoconstricted (Ga,Mn)As devices showing very large resistance changes that can be controlled by both an electric and a magnetic field. Based on the bias voltage and temperature-dependent measurements down to the millikelvin range we compare the models currently used to describe transport through (Ga,Mn)As nanoconstrictions. We provide an explanation for the observed spin-valvelike behavior during a magnetic field sweep by means of the magnetization configurations in the device. Furthermore, we prove that Coulomb blockade plays a decisive role for the transport mechanism and show that modeling the constriction as a granular metal describes the temperature and bias dependence of the conductance correctly and allows to estimate the number of participating islands located in the constriction.
Configurations in fractal sets in Euclidean and non-Archimedean local fields
Creators: name: Fraser, Robert
Publisher: name: University of British Columbia
Year: 2018

description: We discuss four different problems. The first, a joint work with Malabika Pramanik, concerns large subsets of ℝn that do not contain various types of configurations. We show that a collection of v points satisfying a continuously differentiable v-variate equation in ℝ can be avoided by a set of Hausdorff dimension 1/(v-1) and Minkowski dimension 1. The second problem concerns large subsets of vector spaces over non-archimedean local fields that do not contain configurations. Results analogous to the real-variable cases are obtained in this setting. The third problem is the construction of measure-zero Besicovitch-type sets in Kn for non-archimedean local fields K. This construction is based on a Euclidean construction of Wisewell and an earlier construction of Sawyer. The fourth problem, a joint work with Kyle Hambrook, is the construction of an explicit Salem set in ℚp. This set is based on a Euclidean construction of Kaufman. [An errata to this thesis/dissertation was made available on 2019-04-26.]
Crystallisation: solving crystal nucleation problem in the chemical engineering classroom based on the research grade experiments deployed in virtual mode
Creators: name: Vashishtha, Mayank
name: Kakkar, Shubhangi
name: Ranjbar, Mahmoud
name: Kannuchamy, Vasanth Kumar
Publisher: name: University of Limerick
Year: 2024
Subjects: classificationCode: 34
subject: Chemical sciences
subject: FOS: Chemical sciences

description: Crystallization via nucleation can isolate active pharmaceutical ingredients from their crudes. While chemical engineering textbooks provide theoretical knowledge on crystallization and nucleation theories, they often fall short in providing provide practical insights on the nucleation mechanism. To bridge this gap, we introduced a virtual experiment on nucleation in second-year chemical engineering classrooms. The main goal is to educate students on crystallization procedures in research and process industries, teaching them how to analyse and manage collected data while integrating theoretical knowledge. This includes conveying the kind of information that can be obtained from a crystallisation process and instructing students on how to analyse and manage the data collected in the light of the theories learned. We devised an original chemical engineering problem on nucleation, derived directly from the raw data collected in the classroom from virtual experiments. This method differs from the conventional approach of solving standard textbook problems. The textbook problems, regrettably often lack crucial information on how nucleation rate or surface free energy are directly obtained from raw data. By the conclusion of the virtual experiment, students have acquired a comprehensive understanding encompassing both practical and theoretical aspects of crystallization, with a particular focus on nucleation. The methodologies elucidated in this study can be applied across a spectrum of chemical engineering modules, including process engineering, unit operations in chemical engineering, mass transfer, and can even be integrated into specialized courses dedicated to crystallization.
Quantum dot from chiral metallic single walled nanotubes
Creators: name: Banerjee, Riju
name: Bhattacharjee, Joydeep
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We propose a simple approach to construct a quantum-dot and it's electrodes using chiral metallic single walled carbon nanotube (CM-SWCNT) segments of exactly opposite chiralities $(m,n)$ and $(n,m)$. The degree and energetics of electron confinement crucially depends on the choice of $n$ and $m$, and collinearity of the SWCNT segments constituting the quantum-dot and the electrodes. All the segments can in principle be obtained through simple manipulations of fragments of a single nanotube of chirality either $(m,n)$ or $(n,m)$.
Semiclassical approach to the ac conductance of chaotic cavities
Creators: name: Petitjean, Cyril
name: Waltner, Daniel
name: Kuipers, Jack
name: Adagideli, İnanç
name: Richter, Klaus
Publisher: name: Universität Regensburg
Year: 2009
Subjects: subject: 530 Physik
subject: 05.45.Mt
subject: 74.40.+k
subject: 73.23.-b
subject: 03.65.Yz

description: We address frequency-dependent quantum transport through mesoscopic conductors in the semiclassical limit. By generalizing the trajectory-based semiclassical theory of dc quantum transport to the ac case, we derive the average screened conductance as well as ac weak-localization corrections for chaotic conductors. Thereby we confirm respective random matrix results and generalize them by accounting for Ehrenfest time effects. We consider the case of a cavity connected through many leads to a macroscopic circuit which contains ac sources. In addition to the reservoir the cavity itself is capacitively coupled to a gate. By incorporating tunnel barriers between cavity and leads we obtain results for arbitrary tunnel rates. Finally, based on our findings we investigate the effect of dephasing on the charge relaxation resistance of a mesoscopic capacitor in the linear low-frequency regime.
description: Selected for the September 21, 2009 issue of Virtual Journal of Nanoscale Science & Technology