cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: Dynamics of business politics: Evidence from Chinese firm internationalisation to Brazil
Creators: name: Profit Pachioni, Alena
Publisher: name: UNSPECIFIED
Year: 2021

description: This dissertation addresses the role of business politics in the context of Chinese state-owned multinationals by analyzing the emergence and consolidation of a state-owned energy company and its internationalisation to Brazil. The single case study traces the corporate evolution from its initial emergence in 2002 as a consequence of China's power sector reforms to its operations in Brazil in 2016. The findings build on more than three years of field research - including interviews in electricity supply sectors in Brazil and China - as well as extensive analysis of archival and government documents. Using an institutionalist approach, the dissertation identifies that business politics is an important resource to help the company gain competitive advantage. In China, where the company's institutional embeddedness was strong, the company developed the ability to pursue its industrial and internationalisation agenda with relative autonomy, albeit confined to the state-business relations. In Brazil, where its institutional embeddedness was weak, it depended on comparative economic advantage, such as low-cost bidding, technology knowledge transfer, and comparative political advantage, such as diplomatic support. As a result, the case study shows that the firm is able to incrementally build on existing strengths and industrial capabilities to participate in the Brazilian energy sector, while simultaneously consolidating its domestic position in China. In addition to contributing to the literature on the relationship between state-owned enterprises and the state, the study contributes to broader debates about the differences in state-business relations, the political origins of corporate decisions, and industrial upgrading in emerging economies.
Lukas Thommen, Sparta. Verfassungs- und Sozialgeschichte einer griechischen Polis
Creators: name: Will, Wolfgang
Publisher: name: Bonner Jahrbücher
Year: 2019

description: Rezension zu: Lukas Thommen, Sparta. Verfassungs- und Sozialgeschichte einer griechischen Polis. Metzler, Stuttgart/ Weimar 2003. 244 Seiten, 10 Abbildungen, 2 Karten
description: Bonner Jahrbücher, Bd. 204.2004(2006): Bonner Jahrbücher
Testing No-Scale F-SU(5): A 125 GeV Higgs Boson and SUSY at the 8 TeV LHC
Creators: name: Li, Tianjun
name: Maxin, James A.
name: Nanopoulos, Dimitri V.
name: Walker, Joel W.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We celebrate the recent Higgs discovery announcement with our experimental colleagues at the LHC and look forward to the implications that this success will bring to bear upon the continuing search for supersymmetry (SUSY). The model framework named No-Scale F-SU(5) possesses the rather unique capacity to provide a light CP-even Higgs boson mass in the favored 124-126 GeV window while simultaneously retaining a testably light SUSY spectrum that is consistent with emerging low-statistics excesses beyond the Standard Model expectation in the ATLAS and CMS multijet data. In this letter we review the distinctive F-SU(5) mechanism that forges the physical 125 GeV Higgs boson and make a specific assessment of the ATLAS multijet SUSY search observables that may be expected for a 15/fb delivery of 8 TeV data in this model context. Based on our Monte Carlo study, we anticipate that the enticing hints of a SUSY signal observed in the 7 TeV data could be amplified in the 8 TeV results. Moreover, if the existing signal is indeed legitimate, we project that the rendered gains in significance will be sufficient to conclusively rule out an alternative attribution to statistical fluctuation at that juncture.
description: Physics Letters B Version, 7 Pages, 1 Figure
Equality of P-partition generating functions
Creators: name: McNamara, Peter R. W.
name: Ward, Ryan E.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 06A11 (Primary) 05E05, 06A07 (Secondary)

description: To every labeled poset (P,ω), one can associate a quasisymmetric generating function for its (P,ω)-partitions. We ask: when do two labeled posets have the same generating function? Since the special case corresponding to skew Schur function equality is still open, a complete classification of equality among (P,ω) generating functions is likely too much to expect. Instead, we determine necessary conditions and separate sufficient conditions for two labeled posets to have equal generating functions. We conclude with a classification of all equalities for labeled posets with small numbers of linear extensions.
description: 24 pages, 19 figures. Incorporates minor changes suggested by the referees. To appear in Annals of Combinatorics
title: Are LCA Studies on Bulk Mineral Waste Management Suitable for Decision Support? A Critical Review
Creators: name: Dierks, Christian
name: Hagedorn, Tabea
name: Campitelli, Alessio
name: Bulach, Winfried
name: Zeller, Vanessa
Publisher: name: MDPI
Year: 2021

description: Bulk mineral waste materials are one of the largest waste streams worldwide and their management systems can differ greatly depending on regional conditions. Due to this variation, the decision-making context is of particular importance when studying environmental impacts of mineral waste management systems with life cycle assessment (LCA).We follow the premise that LCA results—if applied in practice—are always used in an improvement (i.e., decision-making) context. But how suitable are existing LCA studies on bulk mineral waste management for decision support? To answer this question, we quantitatively and qualitatively assess 57 peer-reviewed bulk mineral waste management LCA studies against 47 criteria. The results show inadequacies regarding decision support along all LCA phases. Common shortcomings are insufficient attention to the specific decision-making context, lack of a consequential perspective, liberal use of allocation and limited justification thereof, missing justifications for excluded impact categories, inadequately discussed limitations, and incomplete documentation. We identified the following significant issues for bulk mineral waste management systems: transportation, the potential leaching of heavy metals, second-order substitution effects, and the choice to include or exclude avoided landfilling and embodied impacts. When applicable, we provide recommendations for improvement and point to best practice examples.
Generation of pure bulk valley current in graphene
Creators: name: Jiang, Yongjin
name: Low, Tony
name: Chang, Kai
name: Katsnelson, Mikhai I.
name: Guinea, Francisco
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The generation of valley current is a fundamental goal in graphene valleytronics but no practical ways of its realization are known yet. We propose a workable scheme for the generation of bulk valley current in a graphene mechanical resonator through adiabatic cyclic deformations of the strains and chemical potential in the suspended region. The accompanied strain gauge fields can break the spatial mirror symmetry of the problem within each of the two inequivalent valleys, leading to a fnite valley current due to quantum pumping. An all-electrical measurement configuration is designed to detect the novel state with pure bulk valley currents.
description: 5 pages, 3 figures
Community EQ: Empathy as a KPI in Post-COVID19 Business Culture
Creators: name: Savinetti, Nicol
Publisher: name: Zenodo
Year: 2021
Subjects: Future of work
Community Empathy
Empathy
Business Culture
Collective Mindfulness
Human resources

description: This white paper proposes that community empathy—in other words, actively practicing collective empathy—be a core element of the future of work in all business organizations, and that it be embraced actively as a key performance indicator using socio-technological solutions. First of all, we present the current state of work as it intersects with (post)COVID19 society, drawing attention to the urgency and recognized need for nurturing “soft” human capabilities like empathy among all employees. We then dive deep into the concept of empathy as it is being harnessed and monetized around the world for the betterment of business and society at large, and argue for a capabilities approach to working with empathy. We also critically reflect on the methods that have been used to create community within business organisations, and share insights into the human science behind community building, and collective thinking and feeling. The solution we propose is to co-create spaces that are conducive to nurturing the practice of empathy. This is a multidimensional process which involves having a good understanding of what empathy actually is, curation, preparation, and the mindful matching of people. In addition to expanding on these dimensions, we provide tips for designing the settings for the encounter(s), and emphasize the importance of reflection and feedback, and the crucial role of consistency and repetition in habit formation. The paper concludes with a succinct overview of the outcomes we as human beings, as employees, as employers, as family members, as citizens and denizens can expect to enjoy as our empathetic capabilities increase - not only at work but also in all of our social relations and interactions.
Towards the Kantorovich dual solution for strictly correlated electrons in atoms and molecules
Creators: name: Mendl, Christian B.
name: Lin, Lin
Publisher: name: arXiv
Year: 2012
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The many-body Coulomb repulsive energy of strictly correlated electrons provides direct information of the exact Hohenberg-Kohn exchange-correlation functional in the strong interaction limit. Until now the treatment of strictly correlated electrons is based on the calculation of co-motion functions with the help of semi-analytic formulations. This procedure is system specific and has been limited to spherically symmetric atoms and strictly 1D systems. We develop a nested optimization method which solves the Kantorovich dual problem directly, and thus facilitates a general treatment of strictly correlated electrons for systems including atoms and small molecules.
description: 3 figures
Canonical Analysis of a System with Fermionic Gauge Symmetry
Creators: name: McKeon, D. G. C.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A non-Abelian gauge field with a topological action is coupled to a spin 3/2 Majorana spinor. The symmetries of this model are analyzed using the Dirac constraint formalism. These symmetries include a Fermionic symmetry and the algebra of these symmetries closes; it is not the algebra of supergravity. The action is invariant without the need to introduce auxiliary fields.
About the directional properties of Solar Spicules from Hough Transform analysis
Creators: name: Tavabi, E.
name: Koutchmy, S.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Spicules are intermittently rising above the surface of the Sun eruptions; EUV jets are now also reported in immediately above layers. The variation of spicule orientation with respect to the solar latitude, presumably reflecting the confinement and the focusing of ejecta by the surrounding global coronal magnetic field, is an important parameter to understand their dynamical properties. A wealth of high resolution images of limb spicules are made available in H CaII emission from the SOT Hinode mission. Furthermore, the Hough transform is applied to the resulting images for making a statistical analysis of spicule orientations in different regions around the solar limb, from the pole to the equator. Spicules are visible in a radial direction in the polar regions with a tilt angle (less than 200). The tilt angle is even reduced to 10 degrees inside the coronal hole with open magnetic field lines and at the lower latitude the tilt angle reaches values in excess of 50 degree.
description: 11 pages, 2 figures
Coupling spans of the Higgs-like boson
Creators: name: Dobrescu, Bogdan A.
name: Lykken, Joseph D.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Using the LHC and Tevatron data, we set upper and lower limits on the total width of the Higgs-like boson. The upper limit is based on the well-motivated assumption that the Higgs coupling to a W or Z pair is not much larger than in the Standard Model. These width limits allow us to convert the rate measurements into ranges for the Higgs couplings to various particles. A corollary of the upper limit on the total width is an upper limit on the branching fraction of exotic Higgs decays. Currently, this limit is 47% at the 95% CL if the electroweak symmetry is broken only by doublets.
description: 18 pages, 2 figures; v2: Minor clarifications, references added
Empowering Underserved Youth Through Financial Capability
Creators: name: Sarathy, Sanjana
Publisher: name: University of Chicago
Year: 2018
Subjects: subject: youth employment
subject: One Summer Chicago (OSC)
subject: financial capability

description: Every summer, thousands of young people in Chicago participate in the city’s summer youth employment program, One Summer Chicago (OSC). Through this program, youth are matched with a paid summer experience where they develop key job readiness skills and explore various potential careers. The youth participating in this program are often minorities from low-income communities, with limited access to financial services that many of their more affluent peers have. For example, youth from these underserved communities rely on expensive services like check cashing that discourage savings, to gain access to their summer earnings. To combat the problems facing these unbanked youth, OSC can serve as a natural intervention point to help develop “financial capability” and provide access to safe and appropriate traditional financial resources. Most of the existing research on summer youth employment focuses on the impact of participation on crime rates, school performance, and long-term employment, but not financial capability. This paper examines the information and resources OSC provides to its participants to become more financially independent with a focus on savings, and suggests specific changes OSC can implement to make financial capability delivery more effective to its youth participants.
Partial mass-degeneracy and spontaneous CP violation in the lepton sector
Creators: name: Araki, Takeshi
name: Ishida, Hiroyuki
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Inspired by the small mass-squared difference measured in the solar neutrino oscillation experiments and by the testability, we suggest that a limit of the partial mass degeneracy, in which masses of the first two generation fermions are degenerate, may be a good starting point for understanding the observed fermion mass spectra and mixing patterns. The limit indicates the existence of a two-dimensional rotation symmetry, such as $O(2)$, $D_N$ and so on, in flavor space of the first two generations. We propose simple models for the lepton sector based on $D_N$ and show that the models can successfully reproduce the experimental data without imposing unnatural hierarchies among dimensionless couplings, although at least $10\%$ tuning is necessary in order to explain a large atmospheric mixing. It is especially found that the $Z_2$ subgroup of the $D_N$ symmetry plays an important role in understanding the smallness of the electron mass and $θ_{13}^{\rm PMNS}$. We also discuss testability of the models by the future neutrinoless-double-beta-decay experiments and cosmological observations.
description: 21pages, 1figure, correspond to published version
title: Predictions of Conjugate Heat Transfer in Turbulent Channel Flow Using Advanced Wall-Modeled Large Eddy Simulation Techniques
Creators: name: Li, Yongxiang
name: Ries, Florian
name: Nishad, Kaushal
name: Sadiki, Amsini
Publisher: name: MDPI
Year: 2021

description: In this paper, advanced wall-modeled large eddy simulation (LES) techniques are used to predict conjugate heat transfer processes in turbulent channel flow. Thereby, the thermal energy transfer process involves an interaction of conduction within a solid body and convection from the solid surface by fluid motion. The approaches comprise a two-layer RANS–LES approach (zonal LES), a hybrid RANS–LES representative, the so-called improved delayed detached eddy simulation method (IDDES) and a non-equilibrium wall function model (WFLES), respectively. The results obtained are evaluated in comparison with direct numerical simulation (DNS) data and wall-resolved LES including thermal cases of large Reynolds numbers where DNS data are not available in the literature. It turns out that zonal LES, IDDES and WFLES are able to predict heat and fluid flow statistics along with wall shear stresses and Nusselt numbers accurately and that are physically consistent. Furthermore, it is found that IDDES, WFLES and zonal LES exhibit significantly lower computational costs than wall-resolved LES. Since IDDES and especially zonal LES require considerable extra work to generate numerical grids, this study indicates in particular that WFLES offers a promising near-wall modeling strategy for LES of conjugated heat transfer problems. Finally, an entropy generation analysis using the various models showed that the viscous entropy production is zero inside the solid region, peaks at the solid–fluid interface and decreases rapidly with increasing wall distance within the fluid region. Except inside the solid region, where steep temperature gradients lead to high (thermal) entropy generation rates, a similar behavior is monitored for the entropy generation by heat transfer process.
title: The Sternberg Paradigm: Correcting Encoding Latencies in Visual and Auditory Test Designs
Creators: name: Klabes, Julian
name: Babilon, Sebastian
name: Zandi, Babak
name: Khanh, Tran Quoc
Publisher: name: MDPI
Year: 2021

description: The Sternberg task is a widely used tool for assessing the working memory performance in vision and cognitive science. It is possible to apply a visual or auditory variant of the Sternberg task to query the memory load. However, previous studies have shown that the subjects’ corresponding reaction times differ dependent on the used variant. In this work, we present an experimental approach that is intended to correct the reaction time differences observed between auditory and visual item presentation. We found that the subjects’ reaction time offset is related to the encoding speed of a single probe item. After correcting for these individual encoding latencies, differences in the results of both the auditory and visual Sternberg task become non-significant, p = 0.252. Thus, an equal task difficulty can be concluded for both variants of item presentation.
title: Transparent boundary condition for the calculation of eigenmodes in transversely infinite waveguides
Creators: name: Patrushev, Mikhail
name: Ackermann, Wolfgang
name: Weiland, Thomas
Publisher: name: Copernicus
Year: 2021

description: Waveguides play one of the key figures in today’s electronics and optics for signal transmission. Corresponding simulations of electromagnetic wave transportation along these waveguides are accomplished by discretization methods such as the Finite Integration Technique (FIT) or the Finite Element Method (FEM). For longitudinally homogeneous and transversely unbounded waveguides these simulations can be approximated by closed boundaries. However, this distorts the original physical model and unnecessarily increases the size of the computational domain size. In this article we present a boundary condition for transversely open waveguides based on the Kirchhoff integral which has been implemented within the framework of FIT. The presented solution is compared with selected conventional methods in terms of computational effort and memory consumption.
The Cauchy Problem for Darboux Integrable Systems and Non-Linear d'Alembert Formulas
Creators: name: Anderson, Ian M.
name: Fels, Mark E.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 58A15, 35L52, 58J70, 35A30, 34A26

description: To every Darboux integrable system there is an associated Lie group $G$ which is a fundamental invariant of the system and which we call the Vessiot group. This article shows that solving the Cauchy problem for a Darboux integrable partial differential equation can be reduced to solving an equation of Lie type for the Vessiot group $G$. If the Vessiot group $G$ is solvable then the Cauchy problem can be solved by quadratures. This allows us to give explicit integral formulas, similar to the well known d'Alembert's formula for the wave equation, to the initial value problem with generic non-characteristic initial data.
An algorithm for quantifying dependence in multivariate data sets
Creators: name: Feindt, Michael
name: Prim, Michael
Publisher: name: arXiv
Year: 2012
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We describe an algorithm to quantify dependence in a multivariate data set. The algorithm is able to identify any linear and non-linear dependence in the data set by performing a hypothesis test for two variables being independent. As a result we obtain a reliable measure of dependence. In high energy physics understanding dependencies is especially important in multidimensional maximum likelihood analyses. We therefore describe the problem of a multidimensional maximum likelihood analysis applied on a multivariate data set with variables that are dependent on each other. We review common procedures used in high energy physics and show that general dependence is not the same as linear correlation and discuss their limitations in practical application. Finally we present the tool CAT, which is able to perform all reviewed methods in a fully automatic mode and creates an analysis report document with numeric results and visual review.
description: 4 pages, 3 figures
Minimax sparse principal subspace estimation in high dimensions
Creators: name: Vu, Vincent Q.
name: Lei, Jing
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistics Theory (math.ST)
subject: Machine Learning (stat.ML)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: We study sparse principal components analysis in high dimensions, where $p$ (the number of variables) can be much larger than $n$ (the number of observations), and analyze the problem of estimating the subspace spanned by the principal eigenvectors of the population covariance matrix. We introduce two complementary notions of $\ell_q$ subspace sparsity: row sparsity and column sparsity. We prove nonasymptotic lower and upper bounds on the minimax subspace estimation error for $0\leq q\leq1$. The bounds are optimal for row sparse subspaces and nearly optimal for column sparse subspaces, they apply to general classes of covariance matrices, and they show that $\ell_q$ constrained estimates can achieve optimal minimax rates without restrictive spiked covariance conditions. Interestingly, the form of the rates matches known results for sparse regression when the effective noise variance is defined appropriately. Our proof employs a novel variational $\sinΘ$ theorem that may be useful in other regularized spectral estimation problems.
description: Published in at http://dx.doi.org/10.1214/13-AOS1151 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Physical Origin of the Universal Three-body Parameter in Atomic Efimov Physics
Creators: name: Naidon, Pascal
name: Endo, Shimpei
name: Ueda, Masahito
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We address the microscopic origin of the universal three-body parameter that fixes the spectrum of three-atom systems in the Efimov regime. We identify it with the van der Waals two-body correlation, which causes the three-atom system to deform when the three atoms come within the distance of the van der Waals length, effectively preventing them from coming closer due to the kinetic-energy cost associated with this three-body deformation. This deformation mechanism explains the universal ratio of the scattering length at the triatomic resonance to the van der Waals length observed in several experiments and confirmed by numerical calculations.
description: 10 pages, 6 figures ; several corrections, one figure removed and one figure added with respect to v2. This is a corrected version with respect to the published article: curves corrected in the last figure (hyper-radial potential) ; removed an incorrect discussion and figure on the hyperangular distribution and average hyperangle (see erratum of the published article)
Bildung für nachhaltige Entwicklung (BNE): Wo stehen die Alten Sprachen?
Creators: name: Friedrich, Anne
Publisher: name: Forum Classicum
Year: 2019

description: Überarbeitete Fassung des Beitrags "Bildung für nachhaltige Entwicklung (BNE): Wo stehen die Alten Sprachen?" Die überarbeitete Version befindet sich ebenfall in der Gesamtausgabe.
description: Forum Classicum, Nr. 1 (2019): Forum Classicum
Entropy Production in Quantum Brownian Motion
Creators: name: Pucci, Lorenzo
name: Esposito, Massimiliano
name: Peliti, Luca
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We investigate how to coherently define entropy production for a process of transient relaxation in the Quantum Brownian Motion model for harmonic potential. We compare a form, called "Poised" (P), which after non-Markovian transients corresponds to a definition of heat as the change in the system Hamiltonian of mean force, with a recent proposal by Esposito (ELB) based on a definition of heat as the energy change in the bath. Both expressions yield a positive-defined entropy production and coincide for vanishing coupling strength, but their difference is proved to be always positive (after non-Markovian transients disappear) and to grow as the coupling strength increases. In the classical over-damped limit the "Poised" entropy production converges to the entropy production used in stochastic thermodynamics. We also investigate the effects of the system size, and of the ensuing Poincaré recurrences, and how the classical limit is approached. We close by discussing the strong-coupling limit, in which the ideal canonical equilibrium of the bath is violated.
title: Tackling Heterogeneous Color Registration: Binning Color Sensors
Creators: name: Myland, Paul
name: Babilon, Sebastian
name: Khanh, Tran Quoc
Publisher: name: UNSPECIFIED
Year: 2021

description: Intelligent systems for interior lighting strive to balance economical, ecological, and health-related needs. For this purpose, they rely on sensors to assess and respond to the current room conditions. With an augmented demand for more dedicated control, the number of sensors used in parallel increases considerably. In this context, the present work focuses on optical sensors with three spectral channels used to capture color-related information of the illumination conditions such as their chromaticities and correlated color temperatures. One major drawback of these devices, in particular with regard to intelligent lighting control, is that even same-type color sensors show production related differences in their color registration. Standard methods for color correction are either impractical for large-scale production or they result in large colorimetric errors. Therefore, this article shows the feasibility of a novel sensor binning approach using the sensor responses to a single white light source for cluster assignment. A cluster specific color correction is shown to significantly reduce the registered color differences for a selection of test stimuli to values in the range of 0.003–0.008 ∆u'v', which enables the wide use of such sensors in practice and, at the same time, requires minimal additional effort in sensor commissioning.
The twistorial structure of loop-gravity transition amplitudes
Creators: name: Speziale, Simone
name: Wieland, Wolfgang M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The spin foam formalism provides transition amplitudes for loop quantum gravity. Important aspects of the dynamics are understood, but many open questions are pressing on. In this paper we address some of them using a twistorial description, which brings new light on both classical and quantum aspects of the theory. At the classical level, we clarify the covariant properties of the discrete geometries involved, and the role of the simplicity constraints in leading to SU(2) Ashtekar-Barbero variables. We identify areas and Lorentzian dihedral angles in twistor space, and show that they form a canonical pair. The primary simplicity constraints are solved by simple twistors, parametrized by SU(2) spinors and the dihedral angles. We construct an SU(2) holonomy and prove it to correspond to the (lattice version of the) Ashtekar-Barbero connection. We argue that the role of secondary constraints is to provide a non trivial embedding of the cotangent bundle of SU(2) in the space of simple twistors. At the quantum level, a Schroedinger representation leads to a spinorial version of simple projected spin networks, where the argument of the wave functions is a spinor instead of a group element. We rewrite the Liouville measure on the cotangent bundle of SL(2,C) as an integral in twistor space. Using these tools, we show that the Engle-Pereira-Rovelli-Livine transition amplitudes can be derived from a path integral in twistor space. We construct a curvature tensor, show that it carries torsion off-shell, and that its Riemann part is of Petrov type D. Finally, we make contact between the semiclassical asymptotic behaviour of the model and our construction, clarifying the relation of the Regge geometries with the original phase space.
description: 40 pages, 3 figures. v2: minor improvements, references added
Two-loop effective potential, thermal resummation and first-order phase transitions: Beyond the high-temperature expansion
Creators: name: Funakubo, Koichi
name: Senaha, Eibun
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study a finite temperature two-loop resummed effective potential in the Abelian gauge theory. A tractable calculation scheme without using a high-temperature expansion is devised. We apply it to the Abelian-Higgs model and its extension to a minimal supersymmetric standard model-like model and study the thermal phase transition. It is shown that our scheme improves the previous results about 10% in the quantities relevant to the phase transition, and its impacts on bubble dynamics could be even more sizable. It still holds that the stop-stop-gluon sunset diagram enhances the strength of the first-order phase transition even without the high-temperature expansion.
description: 6 pages, 6 figures, v2: some clarification and a new figure added, version to appear in PRD
Die Pariser DAAD-Außenstelle in der »Ära Schulte« (1963–1972). Die Institutionalisierung der transnationalen Wissenschaftskooperation in den westdeutsch-französischen Beziehungen
Creators: name: Pfeil, Ulrich
Publisher: name: Francia
Year: 2019

description: Francia, Bd. 32 Nr. 3 (2005)
H. Trotnow, F. Weiss (Hg.), Le musée de Berlin ou Berlin et la liberté préservée (1945–1989). Actes du colloque tenu le 19 novembre 2002 à la Fondation Singer-Polignac, 2003
Creators: name: Erhard, Volker
Publisher: name: Francia
Year: 2019

description: Francia, Bd. 32 Nr. 3 (2005)
title: Estimation of Vegetation-Induced Flow Resistance for Hydraulic Computations Using Airborne Laser Scanning Data
Creators: name: Mewis, Peter
Publisher: name: MDPI
Year: 2021

description: The effect of vegetation in hydraulic computations can be significant. This effect is important for flood computations. Today, the necessary terrain information for flood computations is obtained by airborne laser scanning techniques. The quality and density of the airborne laser scanning information allows for more extensive use of these data in flow computations. In this paper, known methods are improved and combined into a new simple and objective procedure to estimate the hydraulic resistance of vegetation on the flow in the field. State-of-the-art airborne laser scanner information is explored to estimate the vegetation density. The laser scanning information provides the base for the calculation of the vegetation density parameter wp using the Beer–Lambert law. In a second step, the vegetation density is employed in a flow model to appropriately account for vegetation resistance. The use of this vegetation parameter is superior to the common method of accounting for the vegetation resistance in the bed resistance parameter for bed roughness. The proposed procedure utilizes newly available information and is demonstrated in an example. The obtained values fit very well with the values obtained in the literature. Moreover, the obtained information is very detailed. In the results, the effect of vegetation is estimated objectively without the assignment of typical values. Moreover, a more structured flow field is computed with the flood around denser vegetation, such as groups of bushes. A further thorough study based on observed flow resistance is needed.
Ein frühbronzezeitliches Gefäßbruchstück von Welschbillig-Kunkelborn, Kreis Trier-Saarburg
Creators: name: Löhr, Hartwig
Publisher: name: Funde und Ausgrabungen im Bezirk Trier
Year: 2019

description: [nicht vorhanden]
description: Funde und Ausgrabungen im Bezirk Trier, Bd. 13 (1981): Funde und Ausgrabungen im Bezirk Trier : Aus der Arbeit des Rheinischen Landesmuseums Trier
Zur Trageweise der Metallhackamore bei römischen Pferden : ein treverisches Steinbild
Creators: name: Schwinden, Lothar
Publisher: name: Funde und Ausgrabungen im Bezirk Trier
Year: 2019

description: [nicht vorhanden]
description: Funde und Ausgrabungen im Bezirk Trier, Bd. 19 (1987): Funde und Ausgrabungen im Bezirk Trier : Aus der Arbeit des Rheinischen Landesmuseums Trier
Unified Dark Energy-Dark Matter model with Inverse Quintessence
Creators: name: Ansoldi, Stefano
name: Guendelman, Eduardo I.
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We consider a model where both dark energy and dark matter originate from the coupling of a scalar field with a non-conventional kinetic term to, both, a metric measure and a non-metric measure. An interacting dark energy/dark matter scenario can be obtained by introducing an additional scalar that can produce non constant vacuum energy and associated variations in dark matter. The phenomenology is most interesting when the kinetic term of the additional scalar field is ghost-type, since in this case the dark energy vanishes in the early universe and then grows with time. This constitutes an "inverse quintessence scenario", where the universe starts from a zero vacuum energy density state, instead of approaching it in the future.
description: 13 pages; minor changes with references added
Chemical differentiation of planets: a core issue
Creators: name: Toulhoat, Herve
name: Zgonnik, Viacheslav
Publisher: name: arXiv
Year: 2012
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: By plotting empirical chemical element abundances on Earth relative to the Sun and normalized to silicon versus their first ionization potentials, we confirm the existence of a correlation reported earlier. To explain this, we develop a model based on principles of statistical physics that predicts differentiated relative abundances for any planetary body in a solar system as a function of its orbital distance. This simple model is successfully tested against available chemical composition data from CI chondrites and surface compositional data of Mars, Earth, the Moon, Venus, and Mercury. We show, moreover, that deviations from the proposed law for a given planet correspond to later surface segregation of elements driven both by gravity and chemical reactions. We thus provide a new picture for the distribution of elements in the solar system and inside planets, with important consequences for their chemical composition. Particularly, a 4 wt% initial hydrogen content is predicted for bulk early Earth. This converges with other works suggesting that the interior of the Earth could be enriched with hydrogen.
description: 18 pages, 22 figures
Limits on Second-Order Non-Gaussianity from Minkowski Functionals of WMAP Data
Creators: name: Hikage, Chiaki
name: Matsubara, Takahiko
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We analyze non-Gaussianity (NG) due to the primordial bispectrum and trispectrum using CMB temperature maps of WMAP 7-year data. We first apply the perturbative formulae of Minkowski functionals up to second-order NG derived by Matsubara (2010), which enable us to give limits on cubic NG parametrized with tau_NL and g_NL as well as various types of quadratic NG parametrized with f_NL. We find no signature of primordial NG in WMAP 7-year data, but give constraints on the local-type, equilateral-type, orthogonal-type f_NL: f_NL(loc)=20+-42, f_NL(eq)=-121+-208, f_NL(ort)=-129+-171, respectively, and tau_NL/10^4=-7.6+-8.7, and g_NL/10^5=-1.9+-6.4. We also find that these constraints are consistent with the limits from skewness and kurtosis parameters which characterize the perturbative corrections of MFs.
description: 11 pages, 8 figures, MNRAS accepeted
Subset Codes for Packet Networks
Creators: name: Kovačević, Mladen
name: Vukobratović, Dejan
Publisher: name: arXiv
Year: 2012
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences
subject: 94B60

description: In this paper, we present a coding-theoretic framework for message transmission over packet-switched networks. Network is modeled as a channel which can induce packet errors, deletions, insertions, and out of order delivery of packets. The proposed approach can be viewed as an extension of the one introduced by Koetter and Kschischang for networks based on random linear network coding. Namely, while their framework is based on subspace codes and designed for networks in which network nodes perform random linear combining of the packets, ours is based on the so-called subset codes, and is designed for networks employing routing in network nodes.
description: 4 pages
Inhaltsverzeichnis
Creators: name: Redaktion, Die
Publisher: name: Funde und Ausgrabungen im Bezirk Trier
Year: 2019

description: -
description: Funde und Ausgrabungen im Bezirk Trier, Bd. 19 (1987): Funde und Ausgrabungen im Bezirk Trier : Aus der Arbeit des Rheinischen Landesmuseums Trier
On Higher Graph Manifolds
Creators: name: Connell, Chris
name: Suárez-Serrato, Pablo
Publisher: name: arXiv
Year: 2012
Subjects: subject: Geometric Topology (math.GT)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C23, 20F65 (Primary) 20E08, 20F67, 20F69 (Secondary)

description: In this short note we introduce higher graph manifolds and use a version of the barycenter technique to characterize when they undergo volume collapse. In the case when the pure pieces are hyperbolic, we compute the exact value of the minimal volume. We verify the coarse Baum--Connes conjecture for these manifolds and show that they do not admit positive scalar curvature metrics. In the case without any pure pieces, we show the Yamabe invariant vanishes.
description: 23 pages; v2 Final version, corrected mistakes in some proofs, results remain the same
Stadtarchäologie in Trier : das Beispiel 1994
Creators: name: Clemens, Lukas
name: Löhr, Hartwig
Publisher: name: Funde und Ausgrabungen im Bezirk Trier
Year: 2019

description: [nicht vorhanden]
description: Funde und Ausgrabungen im Bezirk Trier, Bd. 27 (1995): Funde und Ausgrabungen im Bezirk Trier : Aus der Arbeit des Rheinischen Landesmuseums Trier
Interaction of atomic quantum gases with a single carbon nanotube
Creators: name: Fink, Martin
name: Müller, Tim-Oliver
name: Eiglsperger, Johannes
name: Madroñero, Javier
Publisher: name: arXiv
Year: 2012
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We study inelastic processes in the hybrid quantum system constituted by a carbon nanotube (CNT) in contact with an ultracold quantum gas, such as a cloud of thermal atoms or a Bose-Einstein condensate (BEC). We present a parameter-free ab-initio approach for the loss rate based on the underlying scattering process, considering the two-dimensional character of the system as well as the exact Casimir-Polder potential. The predicted loss rates are in perfect agreement with recent experimental results, obtained both for a thermal cloud of rubidium atoms and for a BEC. For the trap loss of a thermal cloud, we find that retardation effects become important and contribute significantly, which emphasises the crucial role of the exact interaction potential.
Die spätantike Agrarlandschaft an der Mosel I : Fundstellenerfassung und Aspekte der Siedlungsarchäologie
Creators: name: Kuhnen, Hans-Peter
Publisher: name: Funde und Ausgrabungen im Bezirk Trier
Year: 2019

description: [nicht vorhanden]
description: Funde und Ausgrabungen im Bezirk Trier, Bd. 33 (2001): Funde und Ausgrabungen im Bezirk Trier : Aus der Arbeit des Rheinischen Landesmuseums Trier
Sparse PCA: Optimal rates and adaptive estimation
Creators: name: Cai, T. Tony
name: Ma, Zongming
name: Wu, Yihong
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: Principal component analysis (PCA) is one of the most commonly used statistical procedures with a wide range of applications. This paper considers both minimax and adaptive estimation of the principal subspace in the high dimensional setting. Under mild technical conditions, we first establish the optimal rates of convergence for estimating the principal subspace which are sharp with respect to all the parameters, thus providing a complete characterization of the difficulty of the estimation problem in term of the convergence rate. The lower bound is obtained by calculating the local metric entropy and an application of Fano's lemma. The rate optimal estimator is constructed using aggregation, which, however, might not be computationally feasible. We then introduce an adaptive procedure for estimating the principal subspace which is fully data driven and can be computed efficiently. It is shown that the estimator attains the optimal rates of convergence simultaneously over a large collection of the parameter spaces. A key idea in our construction is a reduction scheme which reduces the sparse PCA problem to a high-dimensional multivariate regression problem. This method is potentially also useful for other related problems.
description: Published in at http://dx.doi.org/10.1214/13-AOS1178 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
title: Reversible Barrier Switching of ZnO/RuO₂ Schottky Diodes
Creators: name: Wendel, Philipp
name: Dietz, Dominik
name: Deuermeier, Jonas
name: Klein, Andreas
Publisher: name: MDPI
Year: 2021

description: The current-voltage characteristics of ZnO/RuO₂ Schottky diodes prepared by magnetron sputtering are shown to exhibit a reversible hysteresis behavior, which corresponds to a variation of the Schottky barrier height between 0.9 and 1.3 eV upon voltage cycling. The changes in the barrier height are attributed to trapping and de-trapping of electrons in oxygen vacancies.
Murus Gallicus : Die Modellrekonstruktion einer keltischen Mauer zum Oppidum Kastel
Creators: name: Nortmann, Hans
Publisher: name: Funde und Ausgrabungen im Bezirk Trier
Year: 2019

description: [nicht vorhanden]
description: Funde und Ausgrabungen im Bezirk Trier, Bd. 34 (2002): Funde und Ausgrabungen im Bezirk Trier : Aus der Arbeit des Rheinischen Landesmuseums Trier
Durst nach Leben : Das spätrömische Gräberfeld am Petrisberg in Trier
Creators: name: Pfahl, Stefan F.
name: Thiel, Marcus
Publisher: name: Funde und Ausgrabungen im Bezirk Trier
Year: 2019

description: [nicht vorhanden]
description: Funde und Ausgrabungen im Bezirk Trier, Bd. 34 (2002): Funde und Ausgrabungen im Bezirk Trier : Aus der Arbeit des Rheinischen Landesmuseums Trier
title: A new species group of Strumigenys (Hymenoptera, Formicidae) from Ecuador, with a description of its mandible morphology
Creators: name: Booher, Douglas B.
name: Hoenle, Philipp O.
Publisher: name: Pensoft Publishers
Year: 2021

description: Strumigenys is one of the most diverse ant genera in the world and arguably the most morphologically diverse, exhibiting an exceptional range of mandible shape and function. A new species, Strumigenys ayersthey sp. nov., discovered in the Chocó region of Ecuador is described. With two morphological characters, this species is shown to be a morphologically unique outlier among Strumigenys globally, having predominately smooth and shining cuticle surface sculpturing and long trap-jaw mandibles. Using μCT scans, we produced 3D images of the worker ant and static images to examine and compare mandible articular morphologies with most morphologically similar members of the mandibularis species group. Cuticular, pilosity, and articular mandible morphological differences supports placing the new species in its own new species group.