cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Tool-supported identification of functional concerns in object-oriented code
Creators: name: Trifu, Mircea
Publisher: name: KIT Scientific Publishing
Year: 2010
Subjects: concern identification
hierarchic concern model
concern skeleton
CoDEx

description: Concern identification aims to find the implementation of a functional concern in existing source code. In this work, concerns are described, using the Hierarchic Concern Model, as gray-boxes containing subconcerns, inputs, and outputs. The inputs and outputs are used as concern seeds to identify data-oriented abstractions of concern implementations, called concern skeletons. The identification approach is based on context free language reachability and supported by a tool, called CoDEx.
Elemental abundances of M dwarfs based on high-resolution near-infrared spectra: Extension of verification by binary systems
Creators: name: Ishikawa, Hiroyuki Tako
name: Kuzuhara, Masayuki
name: Aoki, Wako
name: Hirano, Teruyuki
name: Kotani, Takayuki
name: Omiya, Masashi
Publisher: name: Zenodo
Year: 2023
Subjects: Stellar abundances
Near infrared astronomy
High resolution spectroscopy
Very low mass stars
Late-type dwarf stars

description: M dwarfs are the prominent targets of planet search projects, while the complexity of their spectra has limited the understanding of their individual elemental abundances. We have been developing a method to determine the abundances of Na, Mg, Si, K, Ca, Ti, V, Cr, Mn, Fe, and Sr from the near-infrared high-resolution spectra of M dwarfs. This was previously applied to the targets of the IRD planet survey (Subaru Telescope) to show that the abundance distributions were consistent with the Galactocentric space velocities calculated with Gaia astrometry (Ishikawa et al. 2022). The method was verified by Ishikawa et al. (2020) using the CARMENES archive data of five M dwarfs that have G- or K-type binary companions with known composition. However, verification at a lower temperature range has been required.
 We have observed eight M dwarfs including those with effective temperature (Teff) down to 3000 K in binary systems with hotter primary stars with the CARMENES or the IRD. We present that the results of the most abundances agree with those of primaries. We also investigated the sensitivity of the FeH lines to Teff and estimated the Teff of M dwarfs using them as the Teff indicators. The Teff values derived from the FeH line share a common trend among the IRD planet-survey targets with the literature values, such as the Teff estimated from the Gaia color, and have smaller statistical errors.
description: {"references": ["Ishikawa, H. T. et al. (2020), PASJ, 72, 102", "Ishikawa, H. T. et al. (2022), AJ, 163, 72", "Kawahara, H. et al. (2022), ApJS, 258, 31", "Montes, D. et al. (2018), MNRAS, 479, 1332", "Stassun, K. et al. (2019), AJ, 158, 138"]}
Entwicklung von Kunststoff-Mikroventilen im Batch-Verfahren
Creators: name: Grund, Thomas
Publisher: name: KIT Scientific Publishing
Year: 2010
Subjects: Mikrosystemtechnik
Ventil
Serienfertigung
Aktorik
Formgedächtnislegierung

description: Ziel der vorliegenden Arbeit ist es, die Integration von Materialien in Mikrosysteme zu ermöglichen, welche sich nicht für monolitische Herstellungs- und Integrationsverfahren eignen. Eine aufwändige und somit meist kostspielige Pick-and-Place Montage wird dabei hinsichtlich der wirtschaftlichen Eignung auch für größerer Stückzahlen durch Übertragungstechniken auf der Waferebene vermieden. Als Demonstratorsystem dient ein Kunststoff-Mikroventil mit einem Aktor aus einer Formgedächtnislegierung.
Exploring Effects of Online and Face-to-Face Teaching Formats on Students' Interest and Engagement
Creators: name: Marquardt, Kai
name: Happe, Lucia
Publisher: name: Association for Computing Machinery (ACM)
Year: 2023
Subjects: Teaching
online
face-to-face
interdisciplinary curriculum
interest
engagement
e-learning
computer science education
STEM
K-12

description: The COVID-19 pandemic has highlighted the need for flexible teaching formats, particularly online education, as an alternative to traditional face-to-face (F2F) education. This study investigates the impact of teaching format (online vs. F2F) on secondary school students' interest and engagement. We conducted an exploratory analysis of survey data from 16 workshops (F2F: 12, online: 4) held between January and December 2022, with 129 participants completing the survey (F2F: 76, online: 53, age: 10-16). All workshops covered the same learning topics, provided by online courses developed to raise interest in computer science (CS). Our findings show that the teaching format had a negligible effect on interest development. Still, students in the F2F setting showed higher engagement levels than those in the online setting. Additionally, an analysis of the effect of age indicates that younger students are more engaged in online settings than their older peers. We also found indications for longer-running programs having a greater effect on personal interest development compared to one-day programs. This paper discusses the results and identifies implications for teaching practice and future research. Overall, the study highlights the need to balance the advantages and limitations of both teaching formats and suggests potential strategies to improve online engagement.
Robot Assisted Laser Osteotomy
Creators: name: Burgner, Jessica
Publisher: name: KIT Scientific Publishing
Year: 2010
Subjects: robot assisted surgery
laser bone ablation
computer assisted surgery
laser based osteotomy

description: In the scope of this thesis world's first robot system was developed, which facilitates osteotomy using laser in arbitrary geometries with an overall accuracy below 0.5mm. Methods of computer and robot assisted surgery were reconsidered and composed to a workflow. Adequate calibration and registration methods are proposed. Further a methodology for transferring geometrically defined cutting trajectories into pulse sequences and optimized execution plans is developed.
Service-oriented design of environmental information systems
Creators: name: Usländer, Thomas
Publisher: name: KIT Scientific Publishing
Year: 2010
Subjects: service-oriented architecture
design methodology
environmental information system
SERVUS
resource orientation

description: Service-orientation has an increasing impact upon the design process and the architecture of environmental information systems. This thesis specifies the SERVUS design methodology for geospatial applications based upon standards of the Open Geospatial Consortium. SERVUS guides the system architect to rephrase use case requirements as a network of semantically-annotated requested resources and to iteratively match them with offered resources that mirror the capabilities of existing services.
Effizienter Betrieb von Xenon-Excimer-Entladungen bei hoher Leistungsdichte
Creators: name: Paravia, Mark
Publisher: name: KIT Scientific Publishing
Year: 2010
Subjects: Xenon
Excimer
DBE
Betriebsgeräte
gepulst

description: In der vorliegenden Arbeit wurde der Betrieb dielektrisch behinderte Entladung bei hoher Leistungsdichte und hoher Effizienz untersucht. Hierbei wurde eine Abhängigkeit der homogenen Entladung von der Stromdichte festgestellt. Die nötige Anregungsform wurde in einem resonanten Puls-Betriebsgerät verwirklicht, welches Wirkungsgrade bis 87 % erreicht. Durch goniometrische Strahlungsflussmessungen im UV wurden die erreichte Leistungsdichte und Plasma-Effizienz bestimmt.
An Optical Grooming Switch for High-Speed Traffic Aggregation in Time, Space and Wavelength
Creators: name: Vorreau, Philipp
Publisher: name: KIT Scientific Publishing
Year: 2010
Subjects: Optical Communications
Wavelength Division Multiplexing
Time Division Multiplexing
Traffic Grooming and Aggregation
All-Optical Regeneration

description: In this book a novel optical switch is designed, developed, and tested. The switch integrates optical switching, transparent traffic aggregation/grooming, and optical regener-ation. Innovative switch subsystems are developed that enable these functionalities, including all-optical OTDM-to-WDM converters. High capacity ring interconnection between metro-core rings, carrying 130 Gbit/s OTDM traffic, and metro-access rings carring 43 Gbit/s WDM traffic is experimentally demonstrated. The developed switch features flexibility in bandwidth provisioning, scalability to higher traffic volumes, and backward compatibility with existing network implementations in a future-proof way.
Produktgestaltung an kolloidalen Agglomeraten und Gelen : Gelierung und Fragmentierung anorganisch gefällten Siliciumdioxids
Creators: name: Quarch, Kerstin
Publisher: name: KIT Scientific Publishing
Year: 2010
Subjects: Verfahrenstechnik
Partikeltechnologie
Kolloide
Agglomeration
Gelierung

description: Amorphes Siliciumdioxid findet als Füllstoff verbreitet Anwendung. Es wird u.a. durch die Vermischung einer Silikatlösung mit einer Säure hergestellt. Dabei entsteht intermediär ein Gel. Mit dieser Arbeit wird ein Beitrag zur Steuerung der Eigenschaften des Produktpulvers geleistet. Es wird eine Formel vorgestellt, mit der die Gelierzeit aus den Konzentrationen der Einsatzstoffe abgeschätzt werden kann. Für die Fragmentierung des Gels werden Parallelen zum Aufbruch hochviskoser Tropfen gezeigt.
Semantisches Informationsmodell für die Betriebsunterstützung dienstorientierter Systeme
Creators: name: Majer, Frederic
Publisher: name: KIT Scientific Publishing
Year: 2010
Subjects: IT Service Management
Betrieb
Informationsmodell
Service-orientierte Architektur
Dienstorientierte Systeme

description: Bei der Umsetzung von Geschäftsmodellen wird verstärkt auf das Architekturkonzept der serviceorientierten Architektur (SOA) zurückgegriffen. Vor dem Hintergrund der wachsenden Komplexität der resultierenden dienstorientierten Systeme stellt die vorliegende Arbeit einen systematischen Ansatz zur effektiven Zusammenführung von Informationen, Werkzeugen und Methodiken in ein übergreifendes und konsistent anwendbares Modell zur Verwaltung und Überwachung dienstorientierter Systemlandschaften vor.
title: Luís Serrão Pimentel
Creators: name: Conceição, Margarida
Publisher: name: CHAM, Faculdade de Ciências Sociais e Humanas, Universidade Nova de Lisboa
Year: 2022

description: Entrada biográfica sobre Luís Serrão Pimentel, na plataforma eViterbo
description: Conceição, Margarida Tavares da. 2022. Luís Serrão Pimentel in eViterbo. CHAM, Faculdade de Ciências Sociais e Humanas, Universidade Nova de Lisboa. eISBN: 978-989-8492-77-7
Minimal fibrations of dendroidal sets
Creators: name: Moerdijk, Ieke
name: Nuiten, Joost
Publisher: name: arXiv
Year: 2015
Subjects: subject: Algebraic Topology (math.AT)
subject: Category Theory (math.CT)
subject: FOS: Mathematics

description: We prove the existence of minimal models for fibrations between dendroidal sets in the model structure for infinity-operads, as well as in the covariant model structure for algebras and in the stable one for connective spectra. In an appendix, we explain how our arguments can be used to extend the results of Cisinski, giving the existence of minimal fibrations in model categories of presheaves over generalised Reedy categories of a rather common type. Besides some applications to the theory of algebras over infinity-operads, we also prove a gluing result for parametrized connective spectra (or Gamma-spaces).
Women and girls in Tajikistan: new roles, new expectations; why do girls drop out of school?
Creators: name: Arazmedova, Gozel
Publisher: name: University of North Carolina at Chapel Hill
Year: 2011

description: Education is one of the most important elements in each child's personal development and preparation for adulthood. Girls' school participation remains an alarming issue in Tajikistan since its independence from Soviet Union in 1991, particularly in country's rural and remote areas. This thesis is based on the analysis of primary and secondary sources and different variable such as social, economic life of Tajik people and looks at the mechanism of young girls in Tajikistan dropping out of school and factors contributing to this issue. Further comparison analysis of families' attitude toward girls' education in Kyrgyz and Tajik families is provided. The answer found indicates that the primary reasons for girls to drop out of school in Tajikistan are poverty and the revival of patriarchal values. These factors put women and girls in a less valuable position and influences family's decision on which children to educate. However, in Kyrgyzstan the education of girls is prioritized in the family and seen as a key element in her financial independence.
Numerical efficiency calibration of in vivo measurement systems : Monte Carlo simulations of in vivo measurement scenarios for the detection of incorporated radionuclides, including validation, analysis of efficiency-sensitive parameters and customized anthropomorphic voxel models
Creators: name: Hegenbart, Lars
Publisher: name: KIT Scientific Publishing
Year: 2010
Subjects: Monte Carlo radiation transport simulations
in vivo measurement
incorporated radionuclides
voxel model
efficiency calibration

description: Monte Carlo radiation transport codes were used with virtual models of in vivo measurement equipment. Software was coded to handle memory intensive anthropomorphic voxel models for simulation of measurement scenarios. Tools, methods and models have been validated. Various parameters have been investigated for their sensitivity. Methods based on image registration techniques have been developed to transform existing human models to match with an individual test person.
SALT long-slit spectroscopy of HE 0435-4312: fast displacement in the Mg II emission line
Creators: name: Sredzinska, J.
name: Czerny, B.
name: Hryniewicz, K.
name: Krupa, M.
name: Marziani, P.
name: Adhikari, T. P.
name: Basak, R.
name: You, B.
name: Bilicki, M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The Mg II emission line is visible in the optical band for intermediate redshift quasars (0.4 < z < 1.6) and it is thus an extremely important tool to measure the black hole mass and to understand the structure of the Broad Line Region. We aim to determine the substructure and the variability of the Mg II line with the aim to identify which part of the line comes from a medium in Keplerian motion. Using the Southern African Large Telescope (SALT) with the Robert Stobie Spectrograph (RSS) we performed ten spectroscopic observations of quasar HE 0435-4312 (z = 1.2231) over a period of three years (Dec 23/24, 2012 to Dec 7/8, 2015). Both the Mg II line and the Fe II pseudo-continuum increase with time. We clearly detect the systematic shift of the Mg II line with respect to the Fe II over the years, corresponding to the acceleration of 104 pm 14 km/s/year in the quasar rest frame. The Mg II line shape is clearly non-Gaussian but single-component, and the increase in line equivalent width and line shift is not accompanied with significant evolution of the line shape. We analyse the conditions in the Mg II and Fe II formation region and we note that the very large difference in the covering factor and the turbulent velocity also support the conclusion that the two regions are spatially separated. The measured acceleration of the line systematic shift is too large to connect it with the orbital motion at a distance of the Broad Line Region (BLR) in this source. It may imply a precessing inner disk illuminating the BLR. Further monitoring is still needed to better constrain the variability mechanism.
description: Astronomy and Astrophysics (in press)
Constraining Reionization with Lyman Alpha Emitting Galaxies
Creators: name: Dijkstra, Mark
Publisher: name: arXiv
Year: 2015
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Neutral diffuse intergalactic gas that existed during the Epoch of Reionization (EoR) suppresses Lyman Alpha (Lya) flux emitted by background galaxies. In this chapter I summarise the increasing observational support for the claim that Lya photons emitted by galaxies at z>6 are suppressed by intervening HI gas. I describe key physical processes that affect Lya transfer during the EoR. I argue that in spite of the uncertainties associated with this complex multiscale problem, the data on Lya emitting galaxies at z=0-6 strongly suggests that the observed reduction in Lya flux from galaxies at z>6 is due to additional intervening HI gas. The main question is what fraction of this additional HI gas is in the diffuse neutral IGM. I summarise how future surveys on existing and upcoming instruments are expected to reduce existing observational uncertainties enormously. With these improved data we will likely be able to nail down reionization with Lya emitting galaxies.
description: 17 pages, 6 figures. Book chapter in "Understanding the Epoch of Cosmic Reionization: Challenges and Progress", Springer International Publishing, Ed. Andrei Mesinger, ISBN 978-3-319-21956-1
Static behaviour of induced seismicity
Creators: name: Mignan, Arnaud
Publisher: name: arXiv
Year: 2015
Subjects: subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: The standard paradigm to describe seismicity induced by fluid injection is to apply nonlinear diffusion dynamics in a poroelastic medium. I show that the spatiotemporal behaviour and rate evolution of induced seismicity can, instead, be expressed by geometric operations on a static stress field produced by volume change at depth. I obtain laws similar in form to the ones derived from poroelasticity while requiring a lower description length. Although fluid flow is known to occur in the ground, it is not pertinent to the behaviour of induced seismicity. The proposed model is equivalent to the static stress model for tectonic foreshocks generated by the Non- Critical Precursory Accelerating Seismicity Theory. This study hence verifies the explanatory power of this theory outside of its original scope.
description: 16 pages, 3 figures
Statistical Risk Models
Creators: name: Kakushadze, Zura
name: Yu, Willie
Publisher: name: arXiv
Year: 2016
Subjects: subject: Portfolio Management (q-fin.PM)
subject: Risk Management (q-fin.RM)
subject: FOS: Economics and business

description: We give complete algorithms and source code for constructing statistical risk models, including methods for fixing the number of risk factors. One such method is based on eRank (effective rank) and yields results similar to (and further validates) the method set forth in an earlier paper by one of us. We also give a complete algorithm and source code for computing eigenvectors and eigenvalues of a sample covariance matrix which requires i) no costly iterations and ii) the number of operations linear in the number of returns. The presentation is intended to be pedagogical and oriented toward practical applications.
description: 44 pages; a trivial typo corrected, references updated; to appear in The Journal of Investment Strategies. arXiv admin note: text overlap with arXiv:1602.04902, arXiv:1508.04883, arXiv:1604.08743
Einfluß der Bodenmakrofauna auf Bodenmikromorphologie und Bodenchemie in zentralamazonischen Agrar- und Waldökosystemen
Creators: name: Knoll, Raphael
Publisher: name: KIT Scientific Publishing
Year: 2010
Subjects: Boden
Bodenfauna
Mikromorphologie
Bodenchemie
Amazonien

description: In den kaolinitischen Böden der Terra-firme Amazoniens wird die Bodenfruchtbarkeit stark von der Menge und Qualität der organischen Bodenbestandteile bestimmt. In den Agrar- und Waldökosystemen Zentralamazoniens sind Termiten, Ameisen und Regenwürmer die am häufigsten vorkommenden Vertreter der Bodenmakrofauna und spielen eine wichtige Rolle beim Abbau und Einbau organischer Substanz im Boden.
XMM-Newton observation of a sample of four close dSph galaxies
Creators: name: Manni, L.
name: Nucita, A. A.
name: De Paolis, F.
name: Testa, V.
name: Ingrosso, G.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the results of the analysis of deep archival \sat\ observations towards the dwarf spheroidal galaxies Draco, Leo I, Ursa Major II and Ursa Minor in the Milky Way neighbourhood. The X-ray source population is characterized and cross-correlated with available databases with the aim to infer their nature. We also investigate if intermediate-mass black holes are hosted in the center of these galaxies. In the case of Draco, we detect 96 high-energy sources, two of them being possibly local stars, while no evidence for any X-ray emitting central compact object is found. Towards the Leo I and UMa II field of view we reveal 116 and 49 X-ray sources, respectively. None of them correlates with the putative central black holes and only one is likely associated with a UMa II local source. The study of the UMi dwarf galaxy shows 54 high-energy sources and a possible association {with a source at the dSph center}. We put an upper limit to the central compact object luminosity of 4.02$\times$10$^{33}$ erg/s. Furthermore, via the correlation with a radio source near the galactic center, we get that the putative black hole should have a mass of $\left(2.76^{+32.00}_{-2.54}\right)\times10^6 M_{\odot}$ and be radiatively inefficient. This confirms a previous result obtained by using Chandra data alone.
description: MNRAS, in press, tables available on line
Smoothing methods comparison for CMB E- and B-mode separation
Creators: name: Wang, Yi-Fan
name: Wang, Kai
name: Zhao, Wen
Publisher: name: arXiv
Year: 2015
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The anisotropies of the B-mode polarization in the cosmic microwave background radiation play a crucial role for the study of the very early Universe. However, in the real observation, the mixture of the E-mode and B-mode can be caused by the partial sky surveys, which must be separated before applied to the cosmological explanation. The separation method developed by Smith (\citealt{PhysRevD.74.083002}) has been widely adopted, where the edge of the top-hat mask should be smoothed to avoid the numerical errors. In this paper, we compare three different smoothing methods, and investigate the leakage residuals of the E-B mixture. We find that, if the less information loss is needed and the smaller region is smoothed in the analysis, the \textit{sin}- and \textit{cos}-smoothing methods are better. However, if we need a clean constructed B-mode map, the larger region around the mask edge should be smoothed. In this case, the \textit{Gaussian}-smoothing method becomes much better. In addition, we find that the leakage caused by the numerical errors in the \textit{Gaussian}-smoothing method mostly concentrates on two bands, which is quite easy to be reduced for the further E-B separations.
description: 14 pages, 7 figures, RAA accepted
Formulation of discontinuous Galerkin methods for relativistic astrophysics
Creators: name: Teukolsky, Saul A.
Publisher: name: arXiv
Year: 2015
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Numerical Analysis (math.NA)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The DG algorithm is a powerful method for solving pdes, especially for evolution equations in conservation form. Since the algorithm involves integration over volume elements, it is not immediately obvious that it will generalize easily to arbitrary time-dependent curved spacetimes. We show how to formulate the algorithm in such spacetimes for applications in relativistic astrophysics. We also show how to formulate the algorithm for equations in non-conservative form, such as Einstein's field equations themselves. We find two computationally distinct formulations in both cases, one of which has seldom been used before for flat space in curvilinear coordinates but which may be more efficient. We also give a new derivation of the ALE algorithm (Arbitrary Lagrangian-Eulerian) using 4-vector methods that is much simpler than the usual derivation and explains why the method preserves the conservation form of the equations. The various formulations are explored with some simple numerical experiments that also explore the effect of the metric identities on the results.
The Makeenko-Migdal equation for Yang-Mills theory on compact surfaces
Creators: name: Driver, Bruce K.
name: Gabriel, Franck
name: Hall, Brian C.
name: Kemp, Todd
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences
subject: 81T40 (primary), 81T13

description: We prove the Makeenko-Migdal equation for two-dimensional Euclidean Yang-Mills theory on an arbitrary compact surface, possibly with boundary. In particular, we show that two of the proofs given by the first, third, and fourth authors for the plane case extend essentially without change to compact surfaces.
description: Final version, minor typographical corrections. To appear in Comm. Math. Phys
Level-resolved quantum statistical theory of electron capture into many-electron compound resonances in highly charged ions
Creators: name: Berengut, J. C.
name: Harabati, C.
name: Dzuba, V. A.
name: Flambaum, V. V.
name: Gribakin, G. F.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The strong mixing of many-electron basis states in excited atoms and ions with open $f$ shells results in very large numbers of complex, chaotic eigenstates that cannot be computed to any degree of accuracy. Describing the processes which involve such states requires the use of a statistical theory. Electron capture into these 'compound resonances' leads to electron-ion recombination rates that are orders of magnitude greater than those of direct, radiative recombination, and cannot be described by standard theories of dielectronic recombination. Previous statistical theories considered this as a two-electron capture process which populates a pair of single-particle orbitals, followed by 'spreading' of the two-electron states into chaotically mixed eigenstates. This method is similar to a configuration-average approach, as it neglects potentially important effects of spectator electrons and conservation of total angular momentum. In this work we develop a statistical theory which considers electron capture into 'doorway' states with definite angular momentum obtained by the configuration interaction method. We apply this approach to electron recombination with W$^{20+}$, considering 2 million doorway states. Despite strong effects from the spectator electrons, we find that the results of the earlier theories largely hold. Finally, we extract the fluorescence yield (the probability of photoemission and hence recombination) by comparison with experiment.
description: 11 pages, 5 figures
Rational Points on the Intersection of Three Quadrics
Creators: name: Heath-Brown, D. R.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11D25

description: This paper proves the Hasse principle and weak approximation for varieties defined by the smooth intersection of three quadratics in at least 19 variables, over arbitrary number fields.
Isolation of a germanium(II) cation and a germylene iron carbonyl complex utilizing an imidazolin-2-iminato ligand
Creators: name: Ochiai, Tatsumi
name: Franz, Daniel
name: Wu, Xiao-Nan
name: Inoue, Shigeyoshi
Publisher: name: Technische Universität Berlin
Year: 2015
Subjects: subject: 540 Chemie und zugeordnete Wissenschaften

description: Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
description: This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.
description: The novel amino(imino)germylene 1 was prepared by the conversion of HNIPr (NIPr = bis(2,6-diisopropylphenyl) imidazolin-2-imino) with 1 equiv. of Ge[N(SiMe3)(2)](2). Germylene 1 reacts with B (C6F5)(3) to afford the borate salt 2(+)[MeB(C6F5)(3)](-) in a methyl-abstraction and ring-closing reaction. The conversion of 2 with Fe-2(CO)(9) furnishes the germylene iron carbonyl complex 3 with a trigonal planar-coordinate germanium atom.
Gender Differences and Social Capital Among Temporary and Permanent Migrants in China
Creators: name: Hopping, Douglas
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2016

description: Hukou, the Chinese household registration system, remains a significant barrier to Chinese internal migration. This paper uses panel data from the China Health and Nutrition Survey to look at individual, household, and community level predictors of temporary and permanent migration in China. I estimate discrete-time event history models of temporary and permanent migration between 1991 and 2011. Temporary migrants tend to be younger, come from less urban areas, and are more likely to be male or heads of household than permanent migrants. A gender-stratified model of migration shows distinct differences in the predictors of migration for men and women. Women are less responsive to educational attainment, more responsive to family role and household migration experience, and use social capital differently than their male counterparts. Differences in the reasons men and women provide for migrating help explain how the hukou system exercises control over male and female mobility differently.
Distinguishability revisited: depth dependent bounds on reconstruction quality in electrical impedance tomography
Creators: name: Garde, Henrik
name: Knudsen, Kim
Publisher: name: arXiv
Year: 2016
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35P15, 35R30, 35R05

description: The reconstruction problem in electrical impedance tomography is highly ill-posed, and it is often observed numerically that reconstructions have poor resolution far away from the measurement boundary but better resolution near the measurement boundary. The observation can be quantified by the concept of distinguishability of inclusions. This paper provides mathematically rigorous results supporting the intuition. Indeed, for a model problem lower and upper bounds on the distinguishability of an inclusion are derived in terms of the boundary data. These bounds depend explicitly on the distance of the inclusion to the boundary, i.e. the depth of the inclusion. The results are obtained for disk inclusions in a homogeneous background in the unit disk. The theoretical bounds are verified numerically using a novel, exact characterization of the forward map as a tridiagonal matrix.
description: 25 pages, 6 figures
Activity Tree Harvesting - Entdeckung, Analyse und Verwertung der Nutzungskontexte SCORM-konformer Lernobjekte
Creators: name: Wiesner, André
Publisher: name: KIT Scientific Publishing
Year: 2010
Subjects: Information Retrieval
SCORM
eLearning
E-Learning
learning objects

description: Der Erstellungsaufwand multimedialer Lernangebote kann durch die Wiederverwendung bestehender Materialien deutlich reduziert werden. Wie aber kann das Auffinden solcher wiederverwendbaren Lernressourcen unterstützt werden? Der Autor stellt ein Retrieval-Verfahren vor, das SCORM-basierte Informationen zu Lernobjekten und Kursstrukturen entdeckt, analysiert und verwertet. Auf Grundlage dieser Daten werden für Lehrende als auch Lernende hilfreiche Such- und Empfehlungsdienste angeboten.
Modelling of variability of the chemically peculiar star phi Draconis
Creators: name: Prvák, Milan
name: Liska, Jiří
name: Krtička, Jiří
name: Mikulášek, Zdeněk
name: Lüftinger, T.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Context: The presence of heavier chemical elements in stellar atmospheres influences the spectral energy distribution (SED) of stars. An uneven surface distribution of these elements, together with flux redistribution and stellar rotation, are commonly believed to be the primary causes of the variability of chemically peculiar (CP) stars. Aims: We aim to model the photometric variability of the CP star PHI Dra based on the assumption of inhomogeneous surface distribution of heavier elements and compare it to the observed variability of the star. We also intend to identify the processes that contribute most significantly to its photometric variability. Methods: We use a grid of TLUSTY model atmospheres and the SYNSPEC code to model the radiative flux emerging from the individual surface elements of PHI Dra with different chemical compositions. We integrate the emerging flux over the visible surface of the star at different phases throughout the entire rotational period to synthesise theoretical light curves of the star in several spectral bands. Results: The synthetic light curves in the visible and in the near-UV regions are in very good agreement with the observed variability of the star. The lack of usable far-UV measurements of the star precludes making any conclusions about the correctness of our model in this spectral region. We also obtained 194 new BVRI observations of PHI Dra and improved its rotational period to P=1.716500(2). Conclusions: We show that the inhomogeneous distribution of elements, flux redistribution, and rotation of the star are fully capable of explaining the stellar variability in the visible and the near-UV regions. The flux redistribution is mainly caused by bound--free transitions of silicon and bound--bound transitions of iron.
Accident Reduction System Design
Creators: name: Sohan, Shahed Hossain
Publisher: name: Zenodo
Year: 2023

description: The project aims to develop a comprehensive driver drowsiness detection and speed control system to enhance road safety and prevent accidents caused by driver fatigue or distractions. The system relies on head motion analysis to identify signs of drowsiness, and a prototype of the speed control mechanism is implemented using DC motors. An integrated alarming system will notify the driver in real-time if drowsiness or distraction is detected. By reducing the vehicle's speed when signs of drowsiness are identified, the system effectively mitigates potential hazards. Furthermore, the system also has the capability to detect driver distraction, ensuring proactive safety measures based on head position data collected through a devised head mount. This project holds the potential to significantly contribute to the reduction of road accidents and safeguard the well-being of both drivers and passengers.
 Softwares Used: Arduino IDE, Proteus, SOLIDWORKS Sensor: MPU6050
Analysis and design of multiple element antennas for urban communication
Creators: name: Pontes, Juan
Publisher: name: KIT Scientific Publishing
Year: 2010
Subjects: MIMO
Multiple Element Antennas
Antenna Synthesis
Capacity maximization

description: This work focuses on the analysis and design of multiple element antennas (MEA) and their interaction with the propagation channel. In particular, attention is given to urban channels and how its information throughput, i.e. capacity, can be improved. With this in mind, this work extends an existing network model of the communication system in order to reduce computation time, investigates the communicational limits of MEA systems and proposes a synthesis method for capacity maximization.
Periodic Orbits for a Discontinuous Vector Field Arising from a Conceptual Model of Glacial Cycles
Creators: name: Walsh, James
name: Widiasih, Esther
name: Hahn, Jonathan
name: McGehee, Richard
Publisher: name: arXiv
Year: 2015
Subjects: subject: Dynamical Systems (math.DS)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Conceptual climate models provide an approach to understanding climate processes through a mathematical analysis of an approximation to reality. Recently, these models have also provided interesting examples of nonsmooth dynamical systems. Here we discuss a conceptual model of glacial cycles consisting of a system of three ordinary differential equations defining a discontinuous vector field. We show that this system has a large periodic orbit crossing the discontinuity boundary. This orbit can be interpreted as an intrinsic cycling of the Earth's climate giving rise to alternating glaciations and deglaciations.
Modellierung des dreidimensionalen Strahlungswärmeaustauschs in Verbrennungsräumen mittels Monte Carlo Methode
Creators: name: Brunn, Oliver
Publisher: name: KIT Scientific Publishing
Year: 2010
Subjects: Wärmestrahlung
Monte-Carlo Methode
Freistrahlflamme
Rußstrahlung
Wandwärmestrom

description: Bei Hochtemperaturprozessen ist die Wärmeübertragung durch Strahlung der dominierende Übertragungsmechanismus. Die Kenntnis der thermischen Belastung spielt bei der Auslegung von Hochtemperaturbauteilen eine entscheidende Rolle. Gegenstand dieser Arbeit ist die Bereitstellung eines Monte Carlo Berechnungsverfahrens, welches den dreidimensionalen Strahlungswärmeaustausch in Verbrennungsräumen vollständig wiedergibt und die Rückkopplung mit dem Verbrennungsprozess erfasst.
Do we have privacy in the digital world?
Creators: name: Bakhtiyari, Kaveh
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cryptography and Security (cs.CR)
subject: Human-Computer Interaction (cs.HC)
subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: Not really.
Weak Interband-Coupling Superconductivity in the Filled Skutterudite LaPt4Ge12
Creators: name: Zhang, J. L.
name: Pang, G. M.
name: Jiao, L.
name: Nicklas, M.
name: Chen, Y.
name: Weng, Z. F.
name: Schnelle, W.
name: Leithe-Jasper, A.
name: Maisuradze, A.
name: Baines, C.
name: Khasanov, R.
name: Amato, A.
name: Steglich, F.
name: Gumeniuk, R.
name: Yuan, H. Q.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The superconducting pairing state of LaPt$_{4}$Ge$_{12}$ is studied by measuring the magnetic penetration depth $λ(T,B)$ and the superfluid density $ρ_s(T)$ using a tunnel-diode-oscillator (TDO)-based method and by transverse field muon-spin rotation ($μ$SR) spectroscopy. $λ(T)$ follows an exponential-type temperature dependence at $T\ll T_{c}$, but its zero-temperature value $λ(0)$ increases linearly with magnetic field. Detailed analyses demonstrate that both $λ(T)$ and the corresponding $ρ_{s}(T)$, measured in the Meissner state by the TDO method are well described by a two-gap $γ$ model with gap sizes of $Δ_1(0)=1.31k_{B}T_c$ and $Δ_2(0)=1.80k_{B}T_c$ and a very weak interband coupling. In contrast, $ρ_s(T)$, derived from the $μ\rm{SR}$ data taken in a small field, can be fitted by a single-gap BCS model with a gap close to $Δ_2(0)$. We conclude that LaPt$_{4}$Ge$_{12}$ is a marginal two-gap superconductor and the small gap $Δ_1$ seems to be destroyed by a small magnetic field. In comparison, in PrPt$_4$Ge$_{12}$ the $4f$-electrons may enhance the interband coupling and, therefore, give rise to more robust multiband superconductivity.
description: 5 pages, 4 figures
Modeled Estimates of Solar Direct Normal Irradiance and Diffuse Horizontal Irradiance in Different Terrestrial Locations
Creators: name: Abyad, Emad
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2017
Subjects: DHI and DNI modeling
Reindl, BRL, DISC & Perez models
Correction of solar data
Processing solar and meteorological data
Scatter plot
Measured and Modeled data

description: The transformation of solar energy into electricity is starting to impact to overall worldwide energy production mix. Photovoltaic-generated electricity can play a significant role in minimizing the use of non-renewable energy sources. Sunlight consists of three main components: global horizontal irradiance (GHI), direct normal irradiance (DNI) and diffuse horizontal irradiance (DHI). Typically, these components are measured using specialized instruments in order to study solar radiation at any location. However, these measurements are not always available, especially in the case of the DNI and DHI components of sunlight. Consequently, many models have been developed to estimate these components from available GHI data. These models have their own merits. For this thesis, solar radiation data collected at four locations have been analyzed. The data come from Al-Hanakiyah (Saudi Arabia), Boulder (U.S.), Ma’an (Jordan), and Ottawa (Canada). The BRL, Reindl*, DISC, and Perez models have been used to estimate DNI and DHI data from the experimentally measured GHI data. The findings show that the Reindl* and Perez model outcomes offered similar accuracy of computing DNI and DHI values when comparing with detailed experimental data for Al-Hanakiyah and Ma’an. For Boulder, the Perez and BRL models have similar estimation abilities of DHI values and the DISC and Perez models are better estimators of DNI. The Reindl* model performs better when modeling DHI and DNI for Ottawa data. The BRL and DISC models show similar metrics error analyses, except in the case of the Ma’an location where the BRL model shows high error metrics values in terms of MAE, RMSE, and standard deviation (σ). The Boulder and Ottawa locations datasets were not complete and affected the outcomes with regards to the model performance metrics. Moreover, the metrics show very high, unreasonable values in terms of RMSE and σ. It is advised that a global model be developed by collecting data from many locations as a way to help minimize the error between the actual and modeled values since the current models have their own limitations. Availability of multi-year data, parameters such as albedo and aerosols, and one minute to hourly time steps data could help minimize the error between measured and modeled data. In addition to having accurate data, analysis of spectral data is important to evaluate their impact on solar technologies.
The Effects of Gamma (γ-) Sterilization on the Redox Stability, Minerology, and Physicochemical Properties of the Synthetic Iron Oxides Ferrihydrite, Lepidocrocite, and Goethite
Creators: name: Khan, Brandon Sajad
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2017
Subjects: BIOS
Fe-oxides
Sterilization
Alginate

description: Laboratory analyses were conducted on synthetic iron oxides to assess the use of gamma (γ-) irradiation as an efficient sterilization technique to remove microorganisms present in natural bacteriogenic iron oxides (BIOS) and to determine if the technique induces mineralogical changes within the Fe-rich minerals. Fe-oxides (ferrihydrite, lepidocrocite, and goethite) were synthesized with and without alginate (as a proxy for exopolysaccharides) and microbial reductions were carried out using the bacterium Shewanella putrefaciens CN32. A total of 18 Fe-oxide minerals were subjected to microbial reduction to assess redox stability, alteration due to varying levels of gamma irradiation (0, 5, and 28 kGy), and the addition of the exopolysaccharide alginate. Iron reduction rates varied for each Fe-oxide with faster Fe (III) reduction rates observed for the amorphous poorly-sorted 2-line ferrihydrite and slower Fe (III) reduction for the more crystalline Fe-oxides lepidocrocite and goethite. There was no significant impact to the Fe (III) reduction rates due to gamma irradiation (p> 0.05), which was confirmed using a t-test for statistical variance between gamma irradiated samples. However, the addition of alginate enabled lepidocrocite and goethite to achieve maximum Fe (III) reduction by an average of 7 days faster when compared to the Fe-oxides synthesized without the exopolysaccharide.
A systematic review of psychiatric adverse effects associated with the use of Vilazodone
Creators: name: Kaja, Humraaz
name: Mensah, Kofi
name: Oosthuizen, Frasia
Publisher: name: Open Science Framework
Year: 2022
Subjects: subject: Pharmacy and Pharmaceutical Sciences
subject: Medicine and Health Sciences

description: This systematic review assesses the psychiatric adverse effects associated with the use of Vilazodone as a novel anti-depressant
Entwicklung und Anwendung explizit korrelierter Wellenfunktionsmodelle
Creators: name: Höfener, Sebastian
Publisher: name: KIT Scientific Publishing
Year: 2010
Subjects: Density-Fitting
Störungstheorie
Integralberechnung
Gradienten
molekulare Eigenschaften

description: Die Arbeit befasst sich mit der Ab-Initio-Berechnung von molekularen Eigenschaften, beispielsweise Dipolmomenten oder Strukturen, mithilfe von explizit korrelierter Störungstheorie. Hierzu erfolgt die Herleitung, Implementierung und Analyse der Genauigkeit von analytischen Gradienten für die Methode RI-MP2-F12. Mit diesem Ansatz können Energien und Eigenschaften am Basissatzlimit berechnet werden, so dass der Fehler durch Überlagerung von Basissätzen (BSSE) drastisch reduziert wird.
Preismodellierung und Derivatebewertung im Strommarkt - Theorie und Empirie
Creators: name: Seifert, Jan
Publisher: name: KIT Scientific Publishing
Year: 2010
Subjects: Preismodellierung
Derivatebewertung
Strommarkt
Strompreis
Risikomanagement

description: Strommärkte zeichnen sich durch eine sehr komplexe Strompreischarakteristik aus, die besondere Anforderungen an das Risikomanagement von Energiekonzernen stellt. Die vorliegende Arbeit beschäftigt sich mit der Preismodellierung sowie Derivatebewertung im Strommarkt. Kernpunkte sind dabei die Beschreibung und Schätzung von Preissprüngen, eine einheitliche Kalibrierung an Spot- und Derivatemärkten sowie die Auswirkungen des Emissionszertifikatehandels auf die Strompreischarakteristik.
Wellcome Open Access F1KR00CDE
Creators: name: Irvine, Alan
Publisher: name: Open Science Framework
Year: 2022
Subjects: subject: Medicine and Health Sciences
subject: Life Sciences
subject: atomic force microscopy
subject: atopic dermatitis
subject: corneocyte
subject: elastic modulus
subject: filaggrin
subject: skin barrier

description: Marek Haftek MD, PhD, Maeve A McAleer MB PhD, Ivone Jakasa PhD, WH Irwin McLean PhD DSc. Sanja Kezic PhD, Alan D. Irvine MD DSc
Strain-induced spatial and spectral isolation of quantum emitters in mono- and bi-layer WSe2
Creators: name: Kumar, Santosh
name: Kaczmarczyk, Artur
name: Gerardot, Brian D.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Two-dimensional transition metal dichalcogenide semiconductors are intriguing hosts for quantum light sources due to their unique opto-electronic properties. Here we report that strain gradients induced by substrate patterning result in spatially and spectrally isolated quantum emitters in mono- and bi-layer WSe2. By correlating localized excitons with localized strain-variations, we show that the quantum emitter emission energy can be red-tuned up to a remarkable ~170 meV. We probe the fine-structure, magneto-optics, and second order coherence of a strained emitter. These results raise the prospect to strain-engineer quantum emitter properties and deterministically create arrays of quantum emitters in two-dimensional semiconductors.
description: 6 pages, 4 figures
Mehrlagige mikrofluidische Systeme aus Polymeren zur zweidimensionalen Kapillarelektrophorese
Creators: name: Petrova-Belova, Ludmila
Publisher: name: KIT Scientific Publishing
Year: 2010
Subjects: Lab-on-a-Chip-Systeme
Kapillarelektrophorese (CE)
mehrdimensionale Trennungen
Mikrostrukturtechnik
Mikrofluidik
Leitfähigkeitsmessung

description: Im Rahmen dieser Arbeit wurde ein mehrlagiges mikrofluidisches Lab-on-a-Chip-System auf Polymerbasis für den Einsatz in der Ionenanalytik, Lebensmittelanalytik und Bioanalytik entwickelt. Hierfür wurden Folienchips mit einer integrierten Membran auf PC-COC-Basis und Folienchips auf PEEK-Basis hergestellt, welche die Durchführung einer zweidimensionalen Kapillarelektrophorese (2D-CE) mit kapazitiv gekoppelter kontaktloser Leitfähigkeitsdetektion auf einem Chip ermöglichen.