cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Broken SU(4) symmetry in a Kondo-correlated carbon nanotube
Creators: name: Schmid, Daniel R.
name: Smirnov, Sergey
name: Marganska, Magdalena
name: Dirnaichner, Alois
name: Stiller, Peter L.
name: Grifoni, Milena
name: Hüttel, Andreas K.
name: Strunk, Christoph
Publisher: name: Universität Regensburg
Year: 2015
Subjects: subject: 530 Physik

description: Understanding the interplay between many-body phenomena and nonequilibrium in systems with entangled spin and orbital degrees of freedom is a central objective in nanoelectronics. We demonstrate that the combination of Coulomb interaction, spin-orbit coupling, and valley mixing results in a particular selection of the inelastic virtual processes contributing to the Kondo resonance in carbon nanotubes at low temperatures. This effect is dictated by conjugation properties of the underlying carbon nanotube spectrum at zero and finite magnetic field. Our measurements on a clean carbon nanotube are complemented by calculations based on a field-theoretical Keldysh approach to the nonequilibrium Kondo problem which well reproduces the rich experimental observations in Kondo transport.
Linear solutions for cryptographic nonlinear sequence generators
Creators: name: Fúster-Sabater, A.
name: Caballero-Gil, P.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: This letter shows that linear Cellular Automata based on rules 90/150 generate all the solutions of linear difference equations with binary constant coefficients. Some of these solutions are pseudo-random noise sequences with application in cryptography: the sequences generated by the class of shrinking generators. Consequently, this contribution show that shrinking generators do not provide enough guarantees to be used for encryption purposes. Furthermore, the linearization is achieved through a simple algorithm about which a full description is provided.
Elastic instability in stratified core annular flow
Creators: name: Bonhomme, Oriane
name: Morozov, Alexander
name: Leng, Jacques
name: Colin, Annie
Publisher: name: arXiv
Year: 2010
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We study experimentally the interfacial instability between a layer of dilute polymer solution and water flowing in a thin capillary. The use of microfluidic devices allows us to observe and quantify in great detail the features of the flow. At low velocities, the flow takes the form of a straight jet, while at high velocities, steady or advected wavy jets are produced. We demonstrate that the transition between these flow regimes is purely elastic -- it is caused by viscoelasticity of the polymer solution only. The linear stability analysis of the flow in the short-wave approximation captures quantitatively the flow diagram. Surprisingly, unstable flows are observed for strong velocities, whereas convected flows are observed for low velocities. We demonstrate that this instability can be used to measure rheological properties of dilute polymer solutions that are difficult to assess otherwise.
description: 4 pages, 4 figures
Negativity as an Estimator of Entanglement Dimension
Creators: name: Eltschka, Christopher
name: Siewert, Jens
Publisher: name: Universität Regensburg
Year: 2013
Subjects: subject: 530 Physik
subject: 03.67.Mn
subject: 03.65.Aa

description: Among all entanglement measures negativity arguably is the best known and most popular tool to quantify bipartite quantum correlations. It is easily computed for arbitrary states of a composite system and can therefore be applied to discuss entanglement in an ample variety of situations. However, as opposed to logarithmic negativity, its direct physical meaning has not been pointed out yet. We show that the negativity can be viewed as an estimator of how many degrees of freedom of two subsystems are entangled. As it is possible to give lower bounds for the negativity even in a device-independent setting, it is the appropriate quantity to certify quantumness of both parties in a bipartite system and to determine the minimum number of dimensions that contribute to the quantum correlations.
High-Dimensional Topological Insulators with Quaternionic Analytic Landau Levels
Creators: name: Li, Yi
name: Wu, Congjun
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the 3D topological insulators in the continuum by coupling spin-1/2 fermions to the Aharonov-Casher SU(2) gauge field. They exhibit flat Landau levels in which orbital angular momentum and spin are coupled with a fixed helicity. The 3D lowest Landau level wavefunctions exhibit the quaternionic analyticity as a generalization of the complex analyticity of the 2D case. Each Landau level contributes one branch of gapless helical Dirac modes to the surface spectra, whose topological properties belong to the Z2-class. The flat Landau levels can be generalized to an arbitrary dimension. Interaction effects and experimental realizations are also studied.
Optical methods for sensing and imaging oxygen: materials, spectroscopies and applications
Creators: name: Wang, Xu-dong
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 540 Chemie

description: We review the current state of optical methods for sensing oxygen. These have become powerful alternatives to electrochemical detection and in the process of replacing the Clark electrode in many fields. The article (with 694 references) is divided into main sections on direct spectroscopic sensing of oxygen, on absorptiometric and luminescent probes, on polymeric matrices and supports, on additives and related materials, on spectroscopic schemes for read-out and imaging, and on sensing formats (such as waveguide sensing, sensor arrays, multiple sensors and nanosensors). We finally discuss future trends and applications and summarize the properties of the most often used indicator probes and polymers. The ESI† (with 385 references) gives a selection of specific applications of such sensors in medicine, biology, marine and geosciences, intracellular sensing, aerodynamics, industry and biotechnology, among others.
description: Open-Access-Komponente aus der Allianzlizenz
On the expected number of zeros of nonlinear equations
Creators: name: Malajovich, Gregorio
Publisher: name: arXiv
Year: 2011
Subjects: subject: Algebraic Geometry (math.AG)
subject: Numerical Analysis (math.NA)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 32A60, 65H10, 60G55

description: This paper investigates the expected number of complex roots of nonlinear equations. Those equations are assumed to be analytic, and to belong to certain inner product spaces. Those spaces are then endowed with the Gaussian probability distribution. The root count on a given domain is proved to be `additive' with respect to a product operation of functional spaces. This allows to deduce a general theorem relating the expected number of roots for unmixed and mixed systems. Examples of root counts for equations that are not polynomials nor exponential sums are given at the end.
The Impact of School Nurse Staffing Policies on Student Health and Education
Creators: name: Van Lieshout, Emma
Publisher: name: University of Chicago
Year: 2022

description: The availability of school nurse services is stretched thin at many K-12 schools in the United States—a trend only exacerbated by the COVID-19 pandemic. Previous literature has focused on the efficacy of school nurse practices but provides education policymakers with inadequate evidence to inform broader staffing policies. With the goal of closing this gap, this study uses multivariable regression on combined school nursing employment and student health and academic data to determine whether full-time school nurses have a greater impact on student health and wellbeing than part-time nurses. Findings show that full-time nurses correlate with better health and academic outcomes and have a detectably greater relationship with these outcomes than part-time nurses along several, but not all, measures studied. Recommendations for further research and policy action with respect to school nurses include increased data transparency, additional full-time school nurse hiring and funding, and the promotion of school nursing career paths.
Stereoselective iron-catalyzed alkyne hydrogenation in ionic liquids
Creators: name: Gieshoff, Tim N.
name: Welther, Alice
name: Kessler, Michael T.
name: Prechtl, Martin H. G.
name: Jacobi von Wangelin, Axel
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 540 Chemie

description: Iron(0) nanoparticles in ionic liquids (ILs) have been shown to catalyse the semi-hydrogenation of alkynes. In the presence of a nitrile-functionalised IL or acetonitrile, stereoselective formation of (Z)-alkenes was observed. The biphasic solvent system allowed facile separation and re-use of the catalyst.
description: Open-Access-Komponente aus der Allianzlizenz
Open data portals in northern New England states
Creators: name: Paige, Bonnie E.
Publisher: name: University of British Columbia
Year: 2017

description: As the United States transitions from the Obama administration’s engagement with open government data to the Trump administration’s more closed information strategies, the future support for federal open government data is uncertain. An alternative target for open data initiatives is state-level open government data portals. This study provides preliminary information on state level open data, illustrating challenges faced by small, rural states in supporting an open data portal. The research investigates the current condition of state open data portals: whether their current form and the laws supporting them are sufficient to support their intended use. This study also explores whether the effects of the national political climate can be seen on state portals. This research uses a case study approach, focusing on the northern New England states: Maine, New Hampshire, and Vermont. The case studies use four main methods of investigation: content analysis to determine the goals of the portal, consideration of the policies and context influencing the portal based on the Open Data Policy Framework, inventorying of the data based on the Open Data Barometer, and a review of saved copies of the portals using the Internet Archive. Based on these methods, we found that these portals fall short of supporting their stated goals. Problems with ambiguous licensing, unclear information organization, unclear project ownership, lack of support for data users, and minimal advertisement of the portal’s existence may have contributed to low citizen engagement with the portals. Portal data is vulnerable as none of the states currently have laws that ensure data will be open and proactively provided, although Vermont is considering such legislation. National politics may have an influence on state open data, as Maine’s portalceased updates two days before the federal election. There is potential for those in the field of library and information science to contribute to state level portals through the provision of support for the knowledge organization and information literacy aspects of the portal that are currently lacking. This study also suggests that evaluative tools more specifically attuned to the state open data context would considerably strengthen the analysis of future research.
Exposure of vitamins to UVB and UVA radiation generates singlet oxygen
Creators: name: Knak, Alena
name: Regensburger, Johannes
name: Maisch, Tim
name: Bäumler, Wolfgang
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 610 Medizin

description: Deleterious effects of UV radiation in tissue are usually attributed to different mechanisms. Absorption of UVB radiation in cell constituents like DNA causes photochemical reactions. Absorption of UVA radiation in endogenous photosensitizers like vitamins generates singlet oxygen via photosensitized reactions. We investigated two further mechanisms that might be involved in UV mediated cell tissue damage. Firstly, UVB radiation and vitamins also generate singlet oxygen. Secondly, UVB radiation may change the chemical structure of vitamins that may change the role of such endogenous photosensitizers in UVA mediated mechanisms. Vitamins were irradiated in solution using monochromatic UVB (308 nm) or UVA (330, 355, or 370 nm) radiation. Singlet oxygen was directly detected and quantified by its luminescence at 1270 nm. All investigated molecules generated singlet oxygen with a quantum yield ranging from 0.007 (vitamin D3) to 0.64 (nicotinamide) independent of the excitation wavelength. Moreover, pre-irradiation of vitamins with UVB changed their absorption in the UVB and UVA spectral range. Subsequently, molecules such as vitamin E and vitamin K1, which normally exhibit no singlet oxygen generation in the UVA, now produce singlet oxygen when exposed to UVA at 355 nm. This interplay of different UV sources is inevitable when applying serial or parallel irradiation with UVA and UVB in experiments in vitro. These results should be of particular importance for parallel irradiation with UVA and UVB in vivo, e.g. when exposing the skin to solar radiation.
description: Open-Access-Komponente aus der Allianzlizenz
title: RETROSPECTIVE EVALUATION OF THE ACCURACY OF PERITONITIS INDEXES
Creators: name: Vedenin, Yuriy I.
name: Kuchin, Dmitriy A.
Publisher: name: Astrakhan State Medical University
Year: 2021

description: Abstract. This research is devoted to the retrospective analysis of the case histories of 536 pa-tients with acute abdominal pathology which caused peritonitis, the patients had undergone relaparot-omy. For evaluation three peritonitis indexes are taken: MPI (Mannheim Peritonitis Index), AI (Ab-dominal Index), PI (Predictive Index of relaparotomy). As a result of the conducted evaluation of practical efficiency of peritonitis indexes the statistical conclusion is presented, on which basis a new evaluating system is supposed to be developed which will define indications for relaparotomy and the creation of its new digital modal. A new integral index will comply with all the modern approach, principals, standards of diagnosis and treatment of the patients with peritonitis. The digital modal of a new integral index (mobile application) is planned to be used both for smart phones and for PCs on the base of Android, IOS, Microsoft Windows, MAC, Linux. The creating of a new integral scale will lead to a more accurate determination of indications for relaparotomy which will improve treatment results of patients with peritonitis. The mobile application is expected to simplify the work with a new index and the use of the application will enable to avoid arithmetical errors when calculating. The results of calculations will be stored in an electronic form which will help find out necessary information at any time. Key words: surgery, relaparotomy, peritonitis, urgent, indications, index, application.
Tri-Criterion Modeling for Constructing More-Sustainable Mutual Funds
Creators: name: Utz, Sebastian
name: Wimmer, Maximilian
name: Steuer, Ralph E.
Publisher: name: Universität Regensburg
Year: 2015
Subjects: subject: Socially responsible investing, multiple criteria optimization, portfolio selection, nondominated surfaces, quadratically constrained linear programs
subject: 330 Wirtschaft

description: One of the most important factors shaping world outcomes is where investment dollars are placed. In this regard, there is the rapidly growing area called sustainable investing where environmental, social, and corporate governance (ESG) measures are taken into account. With people interested in this type of investing rarely able to gain exposure to the area other than through a mutual fund, we study a cross section of U.S. mutual funds to assess the extent to which ESG measures are embedded in their portfolios. Our methodology makes heavy use of points on the nondominated surfaces of many tri-criterion portfolio selection problems in which sustainability is modeled, after risk and return, as a third criterion. With the mutual funds acting as a filter, the question is: How effective is the sustainable mutual fund industry in carrying out its charge? Our findings are that the industry has substantial leeway to increase the sustainability quotients of its portfolios at even no cost to risk and return, thus implying that the funds are unnecessarily falling short on the reasons why investors are investing in these funds in the first place.
Measurement of neutral current coherent neutral pion production on carbon in a few-GeV neutrino beam
Creators: name: Kurimoto, Y.
name: Alcaraz-Aunion, J. L.
name: Brice, S. J.
name: Bugel, L.
name: Catala-Perez, J.
name: Cheng, G.
name: Conrad, J. M.
name: Djurcic, Z.
name: Dore, U.
name: Finley, D. A.
name: Franke, A. J.
name: Giganti, C.
name: Gomez-Cadenas, J. J.
name: Guzowski, P.
name: Hanson, A.
name: Hayato, Y.
name: Hiraide, K.
name: Jover-Manas, G.
name: Karagiorgi, G.
name: Katori, T.
name: Kobayashi, Y. K.
name: Kobilarcik, T.
name: Kubo, H.
name: Louis, W. C.
name: Loverre, P. F.
name: Ludovici, L.
name: Mahn, K. B. M.
name: Mariani, C.
name: Masuike, S.
name: Matsuoka, K.
name: McGary, V. T.
name: Metcalf, W.
name: Mills, G. B.
name: Mitsuka, G.
name: Miyachi, Y.
name: Mizugashira, S.
name: Moore, C. D.
name: Nakajima, Y.
name: Nakaya, T.
name: Napora, R.
name: Nienaber, P.
name: Orme, D.
name: Otani, M.
name: Russell, A. D.
name: Sanchez, F.
name: Shaevitz, M. H.
name: Shibata, T. -A.
name: Sorel, M.
name: Stefanski, R. J.
name: Takei, H.
name: Tanaka, H. -K.
name: Tanaka, M.
name: Tayloe, R.
name: Taylor, I. J.
name: Tesarek, R. J.
name: Uchida, Y.
name: Van de Water, R.
name: Walding, J. J.
name: Wascko, M. O.
name: White, H. B.
name: Wilking, M. J.
name: Yokoyama, M.
name: Zeller, G. P.
name: Zimmerman, E. D.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The SciBooNE Collaboration reports a measurement of neutral current coherent neutral pion production on carbon by a muon neutrino beam with average energy 0.8 GeV. The separation of coherent from inclusive neutral pion production has been improved by detecting recoil protons from resonant neutral pion production. We measure the ratio of the neutral current coherent neutral pion production to total charged current cross sections to be (1.16 +/- 0.24) x 10-2. The ratio of charged current coherent pion to neutral current coherent pion production is calculated to be 0.14+0.30 -0.28, using our published charged current coherent pion measurement.
description: seven pages, 6 fiures
Quantifying Tripartite Entanglement of Three-Qubit Generalized Werner States
Creators: name: Siewert, Jens
name: Eltschka, Christopher
Publisher: name: Universität Regensburg
Year: 2012
Subjects: subject: 530 Physik
subject: 03.67.Mn
subject: 03.65.Ud

description: Multipartite entanglement is a key concept in quantum mechanics for which, despite the experimental progress in entangling three or more quantum devices, there is still no general quantitative theory that exists. In order to characterize the robustness of multipartite entanglement, one often employs generalized Werner states, that is, mixtures of a Greenberger-Horne-Zeilinger (GHZ) state and the completely unpolarized state. While two-qubit Werner states have been instrumental for various important advancements in quantum information, as of now there is no quantitative account for such states of more than two qubits. By using the GHZ symmetry introduced recently, we find exact results for tripartite entanglement in three-qubit generalized Werner states and, moreover, the entire family of full-rank mixed states that share the same symmetries.
Umsetzung des Projektes "Digitale Kultur in der Lehre
an der HSLU W": Intensivierung des Lernerlebnisses
durch den Einsatz digitaler Werkzeuge
Creators: name: Trachsel, Viviane
name: Gysler, Thomas
Publisher: name: Zenodo
Year: 2018
Subjects: Digitalisierung
Lehre
Self Testing
E-Assenssment
Buchhaltungssoftware

description: Die Digitalisierung in Accounting und Controlling ist im Moment ein aktuelles Forschungs- und Lehrthema. Neben dem Einfluss der Digitalisierung auf das Fachgebiet geniesst die Digitalisierung auch in der Lehre einen immer höheren Stellenwert. Die Gruppe „Digitale Kultur in der Lehre“ der Hochschule Luzern Wirtschaft hat Mölichkeiten und Grenzen aufgezeigt, wie mit Hilfe digitaler Unterstüzung ein moderner, effizienter und effektiver Unterricht gestaltet werden kann. Es hat sich gezeigt, dass es nicht nur eines Einsatzes digitaler Technik bedarf, sondern ein Wandel im Sinne einer digitalen Kultur notwendig ist. Die aktuelle Umsetzung basiert auf einer heterogenen BYOD (Bring Your Own Device) IT-Infrastruktur und frei erhätlicher oder weit verbreiteter Software. Die Umsetzung im Modul „nternational Financial Accounting“ stüzt sich auf vier Sälen: Als Data Repository dient die Lernplattform ILIAS, diese wird auch fü das Self Testing verwendet. Für die Verbuchungen wird die Buchhaltungssoftware Banana eingesetzt. Der Unterricht wird ergäzt mit digitalen Werkzeugen wie zum Beispiel auf Excel basierten Fallstudien. Die Studierenden haben den Wechsel zu einer digitalen Kultur sehr gut angenommen und erkannt, dass sie mit der praxisorientierten Anwendung der Konzepte des Accounting zu ihrem eigenen beruflichen Erfolg beitragen könen.
description: + ID der Publikation: hslu_57703 + Art des Beitrages: Buchkapitel/Beitrag in Sammelband + Herausgeberschaft: Linard, Nadig, Ulrich Egle + Seiten: 382 - 393 + Sprache: Deutsch + Letzte Aktualisierung: 2019-03-18 10:44:35
Criterion of unitary similarity for upper triangular matrices in general position
Creators: name: Farenick, Douglas
name: Futorny, Vyacheslav
name: Gerasimova, Tatiana G.
name: Sergeichuk, Vladimir V.
name: Shvai, Nadya
Publisher: name: arXiv
Year: 2010
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 15A21, 15A60

description: Each square complex matrix is unitarily similar to an upper triangular matrix with diagonal entries in any prescribed order. Let A and B be upper triangular n-by-n matrices that (i) are not similar to direct sums of matrices of smaller sizes, or (ii) are in general position and have the same main diagonal. We prove that A and B are unitarily similar if and only if ||h(A_k)||=||h(B_k)|| for all complex polynomials h(x) and k=1, 2, . . , n, where A_k and B_k are the principal k-by-k submatrices of A and B, and ||M|| is the Frobenius norm of M.
description: 16 pages
Forecasts of non-Gaussian parameter spaces using Box-Cox transformations
Creators: name: Joachimi, B.
name: Taylor, A. N.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Forecasts of statistical constraints on model parameters using the Fisher matrix abound in many fields of astrophysics. The Fisher matrix formalism involves the assumption of Gaussianity in parameter space and hence fails to predict complex features of posterior probability distributions. Combining the standard Fisher matrix with Box-Cox transformations, we propose a novel method that accurately predicts arbitrary posterior shapes. The Box-Cox transformations are applied to parameter space to render it approximately multivariate Gaussian, performing the Fisher matrix calculation on the transformed parameters. We demonstrate that, after the Box-Cox parameters have been determined from an initial likelihood evaluation, the method correctly predicts changes in the posterior when varying various parameters of the experimental setup and the data analysis, with marginally higher computational cost than a standard Fisher matrix calculation. We apply the Box-Cox-Fisher formalism to forecast cosmological parameter constraints by future weak gravitational lensing surveys. The characteristic non-linear degeneracy between matter density parameter and normalisation of matter density fluctuations is reproduced for several cases, and the capabilities of breaking this degeneracy by weak lensing three-point statistics is investigated. Possible applications of Box-Cox transformations of posterior distributions are discussed, including the prospects for performing statistical data analysis steps in the transformed Gaussianised parameter space.
description: 14 pages, 7 figures; minor changes to match version published in MNRAS
Singlet oxygen generation in porphyrin-doped polymeric surface coating enables antimicrobial effects on Staphylococcus aureus
Creators: name: Felgenträger, Ariane
name: Maisch, Tim
name: Späth, Andreas
name: Schröder, Josef A.
name: Bäumler, Wolfgang
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 540 Chemie
subject: 610 Medizin

description: Surfaces can be coated with photosensitizer molecules, which generate singlet oxygen (1O2) when the surface is exposed to light. 1O2 may diffuse from the coating and has the potential to kill microorganisms present on the surface. In the present study a derivative of the meso-tetraphenylporphyrin (TPP) was immobilized onto polyurethane (PU) after being sprayed and polymerized as a thin layer onto poly-methylmethacrylate (PMMA). PU is gas permeable and thus a sufficient amount of oxygen reaches the photosensitizer in this coating. The surface generation of 1O2 and its diffusion were investigated by detecting its luminescence at 1270 nm and a tri-iodide assay. Antimicrobial photodynamic surface effects were tested on Staphylococcus aureus. The spectrally resolved detection of 1O2 luminescence yielded a clear peak at 1275 nm. The time-resolved luminescence showed multi-exponential decay, revealing rise and decay times in the range of 5–2 × 102 μs. The photodynamic inactivation of S. aureus was monitored at different photosensitizer concentrations and radiant exposures of light. A photodynamic killing of >99.9% (>3log10-steps) was achieved within an irradiation time of 30 min. The photodynamic killing on the bioactive surface confirmed the antimicrobial effect of 1O2 that was generated in the PU-coating and reached the bacteria by diffusion.
description: Open-Access-Komponente aus der Allianzlizenz
Relative Locality in $κ$-Poincaré
Creators: name: Gubitosi, Giulia
name: Mercati, Flavio
Publisher: name: arXiv
Year: 2011
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We show that the $κ$-Poincaré Hopf algebra can be interpreted in the framework of curved momentum space leading to the relativity of locality \cite{AFKS}. We study the geometric properties of the momentum space described by $κ$-Poincaré, and derive the consequences for particles propagation and energy-momentum conservation laws in interaction vertices, obtaining for the first time a coherent and fully workable model of the deformed relativistic kinematics implied by $κ$-Poincaré. We describe the action of boost transformations on multi-particles systems, showing that in order to keep covariant the composed momenta it is necessary to introduce a dependence of the rapidity parameter on the particles momenta themselves. Finally, we show that this particular form of the boost transformations keeps the validity of the relativity principle, demonstrating the invariance of the equations of motion under boost transformations.
description: 24 pages, 4 figures, 1 table. v2 matches accepted CQG version
Selective P4 activation by an organometallic nickel(I) radical: formation of a dinuclear nickel(II) tetraphosphide and related di- and trichalcogenides
Creators: name: Pelties, Stefan
name: Herrmann, Dirk
name: Bruin, Bas de
name: Hartl, František
name: Wolf, Robert
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 540 Chemie

description: The phosphorescence intensity of unilamellar DOPC vesicles with embedded Tb(3+)-cholate complexes depends on the concentration of dihydroxynaphthalene (DHN) as sensitizer in solution. This was used to monitor the enzymatic conversion of DHN esters or DHN glucosides by enzymes in aqueous buffered solution.
description: Open-Access-Komponente aus der Allianzlizenz
Defining integrals over connections in the discretized gravitational functional integral
Creators: name: Khatsymovsky, V. M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 83C27, 53C05, 81S40

description: Integration over connection type variables in the path integral for the discrete form of the first order formulation of general relativity theory is studied. The result (a generalized function of the rest of variables of the type of tetrad or elementary areas) can be defined through its moments, i. e. integrals of it with the area tensor monomials. In our previous paper these moments have been defined by deforming integration contours in the complex plane as if we had passed to an Euclidean-like region. In the present paper we define and evaluate the moments in the genuine Minkowsky region. The distribution of interest resulting from these moments in this non-positively defined region contains the divergences. We prove that the latter contribute only to the singular (\dfun like) part of this distribution with support in the non-physical region of the complex plane of area tensors while in the physical region this distribution (usual function) confirms that defined in our previous paper which decays exponentially at large areas. Besides that, we evaluate the basic integrals over which the integral over connections in the general path integral can be expanded.
description: 18 pages
MPEC 2023-J08 : 2023 HO7
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2023 HO7

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Multipartite-entanglement monotones and polynomial invariants
Creators: name: Eltschka, Christopher
name: Bastin, Thierry
name: Osterloh, Andreas
name: Siewert, Jens
Publisher: name: Universität Regensburg
Year: 2012
Subjects: subject: 530 Physik
subject: 03.67.Mn

description: We show that a positive homogeneous function that is invariant under determinant-1 stochastic local operations and classical communication (SLOCC) transformations defines an N-qubit entanglement monotone if and only if the homogeneous degree is not larger than 4. We then describe a common basis and formalism for the N-tangle and other known invariant polynomials of degree 4. This allows us to elucidate the relation of the four-qubit invariants defined by Luque and Thibon [Phys. Rev. A 67, 042303 (2003)] and the reduced two-qubit density matrices of the states under consideration, thus giving a physical interpretation for those invariants. We demonstrate that this is a special case of a completely general law that holds for any multipartite system with bipartitions of equal dimension, e. g., for an even number of qudits.
Modular synthesis of cyclic cis- and trans-1,2-diamine derivatives
Creators: name: Weber, Anna K.
name: Schachtner, Josef
name: Fichtler, Robert
name: Leermann, Timo M.
name: Neudörfl, Jörg M.
name: Jacobi von Wangelin, Axel
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 540 Chemie

description: Structurally diverse carbocycles with two vicinal nitrogen-substituents were prepared in expedient three-component reactions from simple amines, aldehydes, and nitroalkenes. trans,trans-6-Nitrocyclohex-2-enyl amines were obtained in a one-pot domino reaction involving condensation, tautomerisation, conjugate addition, and nitro-Mannich cyclisation. Upon employment of less nucleophilic carboxamides, a concerted Diels–Alder cycloaddition mechanism operated to give the corresponding cis,trans-nitrocyclohexenyl amides. Both types of substituted carbocycles offer ample opportunities for chemical manipulations at the core and periphery. Ring oxidation with MnO2 affords substituted nitroarenes. Reduction with Zn/HCl provides access to various trans- and cis-diaminocyclohexenes, respectively, in a straight-forward manner. With enantiopure secondary amines, a two-step synthesis of chiral nitrocyclohexadienes was developed (82–94% ee).
description: Open-Access-Komponente aus der Allianzlizenz
Metamaterial slab as a lens, a cloak or something in between
Creators: name: Dong, Jian Wen
name: Zheng, Hui Huo
name: Lai, Yun
name: Wang, He Zhou
name: Chan, C. T.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We show that a metamaterial slab with arbitrary values of epsilon and mu behaves as a cloak at a finite frequency for a small object located sufficiently close to it due to the suppression of the object's optical excitations by enhanced reflections. Reflections due to propagating components can partially suppress the excitation while evanescent components can cloak the object completely. In particular, a Veselago slab with epsilon = mu = -1 + i delta, as well as a class of anisotropic negative refractive index slabs, can completely cloak the small object placed within a finite distance from the slab when delta -> 0.
description: 28 pages, 4 figures, including a paper and its auxiliary material
On the Z_p-ranks of tamely ramified Iwasawa modules
Creators: name: Itoh, Tsuyoshi
name: Mizusawa, Yasushi
name: Ozaki, Manabu
Publisher: name: arXiv
Year: 2011
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11R23

description: For a prime number p, we denote by K the cyclotomic Z_p-extension of a number field k. For a finite set S of prime numbers, we consider the S-ramified Iwasawa module which is the Galois group of the maximal abelian pro-p-extension of K unramified outside S. This paper treats the case where S does not contain p and k is the rational number field or an imaginary quadratic field. In this case, we prove the explicit formulae for the free ranks of the S-ramified Iwasawa modules as abelian pro-p groups, by using Brumer's p-adic version of Baker's theorem on the linear independence of logarithms of algebraic numbers.
Novel ruthenium-catalyst for hydroesterification of olefins with formates
Creators: name: Profir, Irina
name: Beller, Matthias
name: Fleischer, Ivana
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 540 Chemie

description: An alternative ruthenium-based catalyst for the hydroesterification of olefins with formates is reported. The good activity of our system is ensured by the use of a bidentate P,N-ligand and ruthenium dodecacarbonyl. A range of formates can be used for selective alkoxycarbonylation of aromatic olefins. In addition, the synthesis of selected aliphatic esters is realized. The proposed active ruthenium complex has been isolated and characterized.
description: Open-Access-Komponente aus der Allianzlizenz
Studying platelet and monocyte function in atherosclerosis by employing quantitative proteomics
Creators: name: Jiang, Honghui
Publisher: name: University of British Columbia
Year: 2017

description: Atherosclerosis is the major cause of cardiovascular diseases. Both monocytes and platelets are key players in the development and progression of atherosclerosis. Monocyte adhesion, transmigration, and differentiation contribute to atherosclerotic plaque formation. Activated platelets release their granule contents, platelet releasate, to activate and modulate monocytes. The platelet releasate consists of a large number of bioactive proteins, including multiple cytokines and chemokines. The binding of chemokines to specific G protein-coupled receptors in the plasma membrane of monocytes can initiate the intracellular signaling cascade that results in monocyte migration. Multiple small GTPases are critical elements in such intracellular signaling pathways. To determine the effect of platelet releasate on small GTPases in monocytes, the activity level changes of small GTPases were quantified by the quantitative multiplexed small GTPase activity assay. Upon lysophosphatidic acid (LPA)-induced platelet releasate treatment, the activation of both Rap1 and Rap2 GTPases in monocytes was found to be increased through chemokine CXCL12 binding. Like LPA, oxidized phosphatidylcholines (oxPCs) are also oxLDL derivatives. They can be released from plaques upon rupture. The effect of oxPCs on platelets is controversial, but involves the cAMP/cGMP signaling pathway. To define the response of the cAMP/cGMP interactome in platelets upon oxPC treatment, a targeted quantitative chemical proteomics approach was developed and applied to purify cAMP/cGMP binding proteins and quantify their amount change in platelets upon KDdiA-PC and POV-PC stimulation. The amount of PKA-RIα and -RIIα was decreased in POV-PC-stimulated platelets, which coincides with an increase in the intracellular cAMP level. However, sGC inhibitor treatment further decreased the amount of PKA-RIβ and -RIIβ, and PKG1 in POV-PC stimulated platelets, which implies the reduction of intracellular cGMP upon POV-PC stimulation and the cross-talk between cAMP and cGMP signaling. The interaction between phosphodiesterases and cAMP/cGMP demonstrates the compartmentalization of cyclic nucleotide signaling. These findings may help recognize therapeutic targets for prevention of inappropriate monocyte activation and contribute to the application of platelet drugs in combination to avoid undesirable side effects like bleeding.
Generating entanglement between microwave photons and qubits in multiple cavities coupled by a superconducting qutrit
Creators: name: Yang, Chui-Ping
name: Su, Qi-Ping
name: Zheng, Shi-Biao
name: Han, Siyuan
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We discuss how to generate entangled coherent states of four \textrm{microwave} resonators \textrm{(a.k.a. cavities)} coupled by a superconducting qubit. We also show \textrm{that} a GHZ state of four superconducting qubits embedded in four different resonators \textrm{can be created with this scheme}. In principle, \textrm{the proposed method} can be extended to create an entangled coherent state of $n$ resonators and to prepare a Greenberger-Horne-Zeilinger (GHZ) state of $n$ qubits distributed over $n$ cavities in a quantum network. In addition, it is noted that four resonators coupled by a coupler qubit may be used as a basic circuit block to build a two-dimensional quantum network, which is useful for scalable quantum information processing.
description: 13 pages, 7 figures
Entanglement of Three-Qubit Greenberger-Horne-Zeilinger-Symmetric States
Creators: name: Eltschka, Christopher
name: Siewert, Jens
Publisher: name: Universität Regensburg
Year: 2012
Subjects: subject: 530 Physik
subject: 03.67.Mn
subject: 03.65.Ud

description: The first characterization of mixed-state entanglement was achieved for two-qubit states in Werner's seminal work [Phys. Rev. A 40, 4277 (1989)]. A physically important extension concerns mixtures of a pure entangled state [such as the Greenberger-Horne-Zeilinger (GHZ) state] and the unpolarized state. These mixed states serve as benchmark for the robustness of multipartite entanglement. They share the symmetries of the GHZ state. We call such states GHZ symmetric. Here we give a complete description of the entanglement in the family of three-qubit GHZ-symmetric states and, in particular, of the three-qubit generalized Werner states. Our method relies on the appropriate parametrization of the states and on the invariance of entanglement properties under general local operations. An application is the definition of a symmetrization witness for the entanglement class of arbitrary three-qubit states.
Gravity action on the rapidly varying metrics
Creators: name: Khatsymovsky, V. M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mathematical Physics (math-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences
subject: 83C27, 81S40

description: We consider a four-dimensional simplicial complex and the minisuperspace general relativity system described by the metric flat in the most part of the interior of every 4-simplex with exception of a thin layer of thickness $\propto \varepsilon$ along the every three-dimensional face where the metric undergoes jump between the two 4-simplices sharing this face. At $\varepsilon \to 0$ this jump would become discontinuity. Since, however, discontinuity of the (induced on the face) metric is not allowed in general relativity, the terms in the Einstein action tending to infinity at $\varepsilon \to 0$ arise. In the path integral approach, these terms lead to the pre-exponent factor with \dfuns requiring that the induced on the faces metric be continuous, i. e. the 4-simplices fit on their common faces. The other part of the path integral measure corresponds to the action being the sum of independent terms over the 4-simplices. Therefore this part of the path integral measure is the product of independent measures over the 4-simplices. The result obtained is in accordance with our previous one obtained from the symmetry considerations.
description: 10 pages
Supplementary document for Propagation of noninteger cylindrical vector vortex beams in the gradient-index fiber - 6371070.pdf
Creators: name: Yin, Xiaojin
name: Hao, Pengqi
name: Zhang, Yupei
name: Zhao, Ziyue
name: Wu, Jinze
name: Li, Jinhong
Publisher: name: Optica Publishing Group
Year: 2023
Subjects: Uncategorized

description: Derivation and the Comparison of the transmission characteristics in the radial GRIN fiber
Reduced graphene oxide and graphene composite materials for improved gas sensing at low temperature
Creators: name: Zöpfl, Alexander
name: Lemberger, Michael-Maximilian
name: König, Matthias
name: Ruhl, G.
name: Matysik, Frank-Michael
name: Hirsch, Thomas
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 540 Chemie

description: Reduced graphene oxide (rGO) was investigated as a material for use in chemiresistive gas sensors. The carbon nanomaterial was transferred onto a silicon wafer with interdigital gold electrodes. Spin coating turned out to be the most reliable transfer technique, resulting in consistent rGO layers of reproducible quality. Fast changes in the electrical resistance at a low operating temperature of 85 °C could be detected for the gases NO2, CH4 and H2. Especially upon adsorption of NO2 the high signal changes allowed a minimum detection of 0.3 ppm (S/N = 3). To overcome the poor selectivity, rGO was chemically functionalized with octadecylamine, or modified by doping with metal nanoparticles such as Pd and Pt, and also metal oxides such as MnO2, and TiO2. The different response patterns for six different materials allowed the discrimination of all of the test gases by pattern recognition based on principal component analysis.
description: Open-Access-Komponente aus der Allianzlizenz
A supergeometric approach to Poisson reduction
Creators: name: Cattaneo, Alberto S.
name: Zambon, Marco
Publisher: name: arXiv
Year: 2010
Subjects: subject: Symplectic Geometry (math.SG)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53D17, 58A50 (Primary) 18D35 (Secondary)

description: This work introduces a unified approach to the reduction of Poisson manifolds using their description by graded symplectic manifolds. This yields a generalization of the classical Poisson reduction by distributions (Marsden-Ratiu reduction). Further it allows one to construct actions of strict Lie 2-groups and to describe the corresponding reductions.
description: 40 pages. Final version accepted for publication
Adjoint orbit types of compact exceptional Lie group G2 in its Lie algebra
Creators: name: Miyasaka, Takashi
Publisher: name: arXiv
Year: 2010
Subjects: subject: Differential Geometry (math.DG)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 22E15, 22E20, 22E40, 22E46, 17C40

description: A Lie group $G$ naturally acts on its Lie algebra $\gg$, called the adjoint action. In this paper, we determine the orbit types of the compact exceptional Lie group $G_2$ in its Lie algebra $\gg_2$. As results, the group $G_2$ has four orbit types in the Lie algebra $\gg_2$ as $$ G_2/G_2, \quad G_2/(U(1) \times U(1)), \quad G_2/((Sp(1)\times U(1))/\Z_2), \quad G_2/((U(1)\times Sp(1))/\Z_2). $$ These orbits, especially the last two orbits, are not equivalent, that is, there exists no $G_2$-equivariant homeomorphism among them.
description: 7pages,http://web.me.com/coolkai/YSTM/YSTM/YSTM.html
The phylogeny graphs of doubly partial orders
Creators: name: Park, Boram
name: Sano, Yoshio
Publisher: name: arXiv
Year: 2011
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C20, 05C75

description: The competition graph of a doubly partial order is known to be an interval graph. The CCE graph and the niche graph of a doubly partial order are also known to be interval graphs if the graphs do not contain a cycle of length four and three as an induced subgraph, respectively. Phylogeny graphs are variant of competition graphs. The phylogeny graph $P(D)$ of a digraph $D$ is the (simple undirected) graph defined by $V(P(D)):=V(D)$ and $E(P(D)):=\{xy \mid N^+_D(x) \cap N^+_D(y) \neq \emptyset \} \cup \{xy \mid (x,y) \in A(D) \}$, where $N^+_D(x):=\{v \in V(D) \mid (x,v) \in A(D)\}$. In this note, we show that the phylogeny graph of a doubly partial order is an interval graph. We also show that, for any interval graph $G$, there exists an interval graph $\tilde{G}$ such that $\tilde{G}$ contains the graph $G$ as an induced subgraph and that $\tilde{G}$ is the phylogeny graph of a doubly partial order.
description: 9 pages, 1 figure
title: "Statuetta di Kore restaurata quale Iside", arte romana, inv. CXI (ITA/EN)
title: Scheda catalogo digitale Borghese
titleType: AlternativeTitle
Creators: name: Ciccarello, Giulia
name: Galleria Borghese
Publisher: name: Galleria Borghese
Year: 2024

description: Pubblicazione delle schede delle opere conservate nel museo ed estratte dal catalogo digitale di

Galleria Borghese, nelle due versioni esistenti online, in italiano e inglese.

Collegamento al catalogo digitale:

ITA: https://www.collezionegalleriaborghese.it/

EN: https://www.collezionegalleriaborghese.it/en