cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Fidelity approach to Gaussian transitions
Creators: name: Tzeng, Yu-Chin
name: Hung, Hsiang-Hsuan
name: Chen, Yung-Chung
name: Yang, Min-Fong
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The fidelity approach to the Gaussian transitions in spin-one XXZ spin chains with three different values of Ising-like anisotropy lambda is analyzed by means of the density matrix renormalization group (DMRG) technique for systems of large sizes. We find that, despite the success in the cases of lambda=2.59 and 1, the fidelity susceptibility fails to detect the Gaussian transition for lambda=0.5. Thus our results demonstrate the limitation of the fidelity susceptibility in characterizing quantum phase transitions, which was proposed recently in general frameworks.
description: 9 pages, 9 figures
Ladder of Loschmidt anomalies in the deep strong-coupling regime of a qubit-oscillator system
Creators: name: Betancourt, J. M.
name: Rodríguez, F. J.
name: Quiroga, L.
name: Johnson, N. F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We uncover a remarkably regular array of singularity-like structures within the deep strong-coupling limit of qubit-oscillator (e.g. light-matter) systems described by the quantum Rabi model, as a function of time and coupling strength. These non-analytic anomalies in the Loschmidt amplitude (echoes) suggest the existence of new forms of dynamical phase transition within this deep strong-coupling regime. The key feature whereby the initial state collapses into orthogonal states at select values of the interaction strength and select times, may be used to enhance - or attack - quantum information processing or computation schemes that rely on removing - or retaining - a given quantum state.
description: 4 figures, bibtex is attached as a separate file
Cosmological consequences of generalised RS II braneworlds
Creators: name: Pal, Supratik
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We discuss certain features of cosmology in a generalised RS II braneworld scenario. In this scenario, the bulk is given by a Schwarzschild-anti de Sitter or a Vaidya-anti de Sitter black hole in which an FRW brane is consistently embedded, resulting in modifications of the 4-dimensional Friedmann equations. We analyse how the scenario can be visualised and discuss the significance of each term in these modified equations both for early time and for late time cosmology. We further analyse the perturbation equations, based on Newtonian as well as relativistic perturbations and show that the scenario has the potentiality to explain structure formation by the ``Weyl fluid'' arising from embedding geometry. The results thus obtained are confronted with observations as well.
description: Invited talk given at PWED-08, IIT Kharagpur, Feb 2008 and HEPCOS-08, Jamia Millia Islamia, New Delhi, March 2008. To appear in the proceedings of PWED-08
Pelatihan dan Pendampingan Aplikasi Open Journal System (OJS) Bagi Reviewer dan Editor
Creators: name: Maulana, Asep Erlan
Publisher: name: Zenodo
Year: 2021
Subjects: Ojs3
manajemen publikasi ilmiah

description: Materi ini disampaikan pada kegiatan Pelatihan dan Pendampingan Aplikasi Open Journal System (OJS) Bagi Reviewer dan Editor di Jurnal Ilmu dan Teknologi Kesehatan (JITek) dan Jurnal Keperawatan (JKEP) POLTEKKES Jakarta III.
COOPERAÇÃO GLOBAL NA EXPLORAÇÃO ESPACIAL - PROTEGENDO EXPLORADORES CÓSMICOS DOS PERIGOS DA RADIAÇÃO
Creators: name: Brandl, Edenilson
Publisher: name: Zenodo
Year: 2023
Subjects: NASA
Exploração Espacial
Radiação Cósmica
Cooperação Internacional
Proteção Espacial
Inovação Tecnológica
Ética na Exploração
Saúde de Astronautas
Nanotecnologia Espacial
Experimentos Astrobiológicos
Rastreamento Cósmico

description: Este artigo aborda a significativa ameaça da radiação cósmica na exploração espacial e destaca a necessidade crítica de cooperação global para enfrentar esse desafio. Exploradores cósmicos enfrentam riscos substanciais à saúde e à integridade de equipamentos devido a partículas de alta energia provenientes do sol e do espaço interestelar. A proteção eficaz contra esses perigos exige inovações contínuas, como materiais de escudo avançados e tecnologias de detecção em tempo real. Além disso, a colaboração internacional é essencial para o desenvolvimento de estratégias de mitigação éticas e sustentáveis. O artigo também destaca a interconexão de áreas de pesquisa, incluindo experimentos astrobiológicos, nanotecnologia, rastreamento cósmico e exploração robótica, ressaltando a necessidade de esforços conjuntos na exploração do cosmos. Conclui-se que a cooperação global é fundamental para superar os desafios da exploração espacial e alcançar avanços significativos na proteção dos exploradores cósmicos..

 

This article addresses the significant threat of cosmic radiation to space exploration and highlights the critical need for global cooperation to address this challenge. Cosmic explorers face substantial health and equipment integrity risks from high-energy particles originating from the sun and interstellar space. Effective protection against these hazards requires continuous innovations such as advanced shield materials and real-time detection technologies. Furthermore, international collaboration is essential for developing ethical and sustainable mitigation strategies. The article also highlights the interconnectedness of research areas, including astrobiological experiments, nanotechnology, cosmic tracking and robotic exploration, highlighting the need for joint efforts in exploring the cosmos. It is concluded that global cooperation is essential to overcome the challenges of space exploration and achieve significant advances in the protection of cosmic explorers.
Gustavo Corni, Hitler's Ghettos. Voices from a Beleaguered Society 1939-1944
Creators: name: Friedrich, Klaus-Peter
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2005

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 54 Nr. 3 (2005)
Workshop penguatan jurnal menuju jurnal terakreditasi
Creators: name: , Faiza
Publisher: name: Zenodo
Year: 2021
Subjects: akreditasi jurnal, SINTA, ARJUNA, menuju akreditasi jurnal nasional

description: Workshop penguatan jurnal menuju jurnal terakreditasi 2021. Kerjasama antara RJI dengan FTIK IAIN Pekalongan. diadakan pada hari Kamis tanggal 26 November 2021 bertempat di aula FTIK IAIN Pekalongan. Narasumber: Faizal Risdianto, S.S,M.Hum
Magnetic Photocurrents in Multifold Weyl Fermions
Creators: name: Kaushik, Sahal
name: Cano, Jennifer
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We examine the magneto-optical response of chiral multifold fermions. Specifically, we show that they are ideal candidates for observing the Helical Magnetic Effect (HME) previously predicted for simple Weyl fermions. Unlike Weyl fermions, the HME is present in multifold fermions even in the simplest case where the low-energy dispersion is linear and spherically symmetric. In this ideal case, we derive an analytical expression for the HME and find it is proportional to the circular photogalvanic effect; for realistic parameters and accounting for the geometry of the setup, the HME photocurrent could be roughly the same order of magnitude as the circular photogalvanic effect observed in multifold fermions. Additional non-linear and symmetry-breaking terms will ruin the quantization but not hurt the observation of the HME.
description: 9 pages; 5 figures. Accepted Version
Subleading properties of the QCD flux-tube in 3-d lattice gauge theory
Creators: name: Dass, N. D. Hari
name: Majumdar, Pushan
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We study the continuum limit of the string-like behaviour of flux tubes formed between static quarks and anti-quarks in three dimensional SU(2) lattice gauge theory. We compare our simulation data with the predictions of both effective string models as well as perturbation theory. On the string side we obtain clear evidence for convergence of data to predictions of Nambu-Goto theory. We comment on the scales at which the static potential starts departing from one loop perturbation theory and then again being well described by effective string theories. We also estimate the leading corrections to the one-loop perturbative potential as well as the Nambu-Goto effective string. In the intermediate regions we find an empirical formula which gives surprisingly good fits.
description: 7 pages. 1 table and 3 figures. Contributed to The XXV International Symposium on Lattice Field Theory, Regensburg, Germany
Molar volume of solid isotopic helium mixtures
Creators: name: Herrero, Carlos P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Solid isotopic helium mixtures have been studied by path-integral Monte Carlo simulations in the isothermal-isobaric ensemble. This method allowed us to study the molar volume as a function of temperature, pressure, and isotopic composition. At 25 K and 0.2 GPa, the relative difference between molar volumes of isotopically-pure crystals of 3He and 4He is found to be about 3%. This difference decreases under pressure, and for 12 GPa it is smaller than 1%. For isotopically-mixed crystals, a linear relation between lattice parameters and concentrations of helium isotopes is found, in agreement with Vegard's law. The virtual crystal approximation, valid for isotopic mixtures of heavier atoms, does not give reliable results for solid solutions of helium isotopes.
description: 7 pages, 5 figures
Corrected entropy of BTZ black hole in tunneling approach
Creators: name: Modak, Sujoy Kumar
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigate further the recent analysis \cite{R.Banerjee2}, based on a Hamilton-Jacobi type approach, to compute the temperature and entropy of black holes beyond the semiclassical approximation. It is shown how non spherically symmetric geometries are inducted in the general formalism by explicitly considering the BTZ black hole. The leading (logarithmic) and non leading corrections to the area law are obtained.
description: 12 pages, no figures, minor changes, version to appear in Phys. Lett. B
Order symmetry breaking and broad distribution of events in spiking neural networks with continuous membrane potential
Creators: name: Stucchi, Marco
name: Pittorino, Fabrizio
name: di Volo, Matteo
name: Vezzani, Alessandro
name: Burioni, Raffaella
Publisher: name: arXiv
Year: 2021
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: We introduce an exactly integrable version of the well-known leaky integrate-and-fire (LIF) model, with continuous membrane potential at the spiking event, the c-LIF. We investigate the dynamical regimes of a fully connected network of excitatory c-LIF neurons in the presence of short-term synaptic plasticity. By varying the coupling strength among neurons, we show that a complex chaotic dynamics arises, characterized by scale free avalanches. The origin of this phenomenon in the c-LIF can be related to the order symmetry breaking in neurons spike-times, which corresponds to the onset of a broad activity distribution. Our analysis uncovers a general mechanism through which networks of simple neurons can be attracted to a complex basin in the phase space.
description: 10 pages, 9 figures; to appear in Chaos, Solitons & Fractals
Kai Arne Linnemann, Das Erbe der Ostforschung. Zur Rolle Göttingens in der Geschichtswissenschaft der Nachkriegszeit.
Creators: name: Mühle, Eduard
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2003

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 52 Nr. 3 (2003)
Achievable Physical-Layer Secrecy in Multi-Mode Fiber Channels using Artificial Noise
Creators: name: Jorswieck, Eduard
name: Lonnstrom, Andrew
name: Besser, Karl-Ludwig
name: Rothe, Stefan
name: Czarske, Juergen W.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Reliable and secure communication is an important aspect of modern fiber optic communication. In this work we consider a multi-mode fiber (MMF) channel wiretapped by an eavesdropper. We assume the transmitter knows the legitimate channel, but statistical knowledge of the eavesdropper's channel only. We propose a transmission scheme with artificial noise (AN) for such a channel. In particular, we formulate the corresponding optimization problem which aims to maximize the average secrecy rate and develop an algorithm to solve it. We apply this algorithm to actual measured MMF channels. As real fiber measurements show, for a 55 mode MMF we can achieve positive average secrecy rates with the proper use of AN. Furthermore, the gain compared to standard precoding and power allocation schemes is illustrated.
description: 5 pages, 2 figures
Spin labeling and analysis of erythrocyte surfaces
Creators: name: Snoek, Robert
Publisher: name: University of British Columbia
Year: 2010

description: Spin labeling the oligosaccharides of the red cell membrane was achieved via selective oxidation of gal/ga1NAc (with galactose oxidase) or sialic acid residues (with mild periodic acid) followed by reductive amination of the oxidized sugars with NaBH₃CN and TEMPAMINE. Spin labeling the galactose residues resulted in low yields and specificity, hindering analysis of the spin labeled cells (SL-RBC). Higher specificity and yields were obtained by labeling sialic acids. A protocol was devised which gave maximum yields with no Heisenberg exchange or membrane alterations (as detected by gel electrophoresis). Detailed analysis of the product showed the majority of the spins to be on the PAS positive membrane proteins (glycophorin A, B and C), only 8% being associated with the lipids. Isolation of glycophorin A, the major sialoglycoprotein of the red cell membrane, revealed two modified sialic acids per molecule. Successful ESR interpretations could only be done by lysing the SL-RBC (producing SL-ghosts), eliminating spins which had become internalized (rather than covalently attached to the surface) during the reductive amination step. Assuming a random distribution of biradicals (since there were two spins per glycophorin), an average separation of 16±2 angstroms was calculated between the nitroxides. The spin labeled sialic acids exhibited relatively mobile spectra with Ʈc = 9 x l0⁻¹⁰s. Upon addition of wheat germ agglutinin (WGA), a lectin known to bind to glycophorin, the mobility of the spin label decreased. Even though WGA binding to SL-ghosts showed complex behaviour as detected by Scatchard plots (which required compensation for WGA impurities and non-specific binding), the ESR was only sensitive to the specific binding, the spin mobility decreasing with increasing WGA. The fact that the spin probe was monitoring sialic acids interactions was confirmed by addition of other lectins. Only lectins which interact with glycophorin altered the ESR signal.
Simonis de Kéza, Gesta Hungarorum. The Deeds of the Hungarians
Creators: name: Kersken, Norbert
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2003

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 52 Nr. 4 (2003)
The proper motion of the Arches cluster with Keck Laser-Guide Star Adaptive Optics
Creators: name: Stolte, Andrea
name: Ghez, Andrea M.
name: Morris, Mark
name: Lu, Jessica R.
name: Brandner, Wolfgang
name: Matthews, Keith
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the first measurement of the proper motion of the young, compact Arches cluster near the Galactic center from near-infrared adaptive optics (AO) data taken with the recently commissioned laser-guide star (LGS) at the Keck 10-m telescope. The excellent astrometric accuracy achieved with LGS-AO provides the basis for a detailed comparison with VLT/NAOS-CONICA data taken 4.3 years earlier. Over the 4.3 year baseline, a spatial displacement of the Arches cluster with respect to the field population is measured to be 24.0 +/- 2.2 mas, corresponding to a proper motion of 5.6 +/- 0.5 mas/yr or 212 +/- 29 km/s at a distance of 8 kpc. In combination with the known line-of-sight velocity of the cluster, we derive a 3D space motion of 232 +/- 30 km/s of the Arches relative to the field. The large proper motion of the Arches cannot be explained with any of the closed orbital families observed in gas clouds in the bar potential of the inner Galaxy, but would be consistent with the Arches being on a transitional trajectory from x1 to x2 orbits. We investigate a cloud-cloud collision as the possible origin for the Arches cluster. The integration of the cluster orbit in the potential of the inner Galaxy suggests that the cluster passes within 10 pc of the supermassive black hole only if its true GC distance is very close to its projected distance. A contribution of young stars from the Arches cluster to the young stellar population in the inner few parsecs of the GC thus appears increasingly unlikely. The measurement of the 3D velocity and orbital analysis provides the first observational evidence that Arches-like clusters do not spiral into the GC. This confirms that no progenitor clusters to the nuclear cluster are observed at the present epoch.
description: 22 pdflatex pages including 12 figures, reviewed version accepted by ApJ
Variational Quantum Linear Solver with Dynamic Ansatz
Creators: name: Patil, Hrushikesh
name: Wang, Yulun
name: Krstic, Predrag
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Variational quantum algorithms have found success in the NISQ era owing to their hybrid quantum-classical approach which mitigate the problems of noise in quantum computers. In our study we introduce the dynamic ansatz in the Variational Quantum Linear Solver for a system of linear algebraic equations. In this improved algorithm, the number of layers in the hardware efficient ansatz circuit is evolved, starting from a small and gradually increasing until convergence of the solution is reached. We demonstrate the algorithm advantage in comparison to the standard, static ansatz by utilizing fewer quantum resources and with a smaller quantum depth on average, in presence and absence of quantum noise, and in cases when the number of qubits or condition number of the system matrix are increased. The numbers of iterations and layers can be altered by a switching parameter. The performance of the algorithm in using quantum resources is quantified by a newly defined metric.
Aspects of the organometallic nitrosyl chemistry of Cr, Mo and W
Creators: name: Hunter, Allen Dale
Publisher: name: University of British Columbia
Year: 2010

description: The principal organometallic products resulting from the reactions of Na[(ƞ⁵-C₅H₄R)Cr(CO)₃] (R = H or Me) with allyl chlorides in THF are the green, dimeric [(ƞ⁵-C₅H₄R)Cr(CO)₃]₂ complexes (51-67% yields). The red organometallic by-products usually formed during these conversions are novel (ƞ⁶-6-alkenylfulvene)Cr(C0)₃ complexes (5-8% yields) which have been characterized completely by conventional spectroscopic methods. Dark green [W(N0)₂Cl₂]n may be synthesized in high yields by two preparative methods. The first method involves treatment of WCl₆ in CH₂Cl₂ with an excess of NO, and it proceeds via the isolable intermediate complexes, dark violet c̲i̲̲s̲-W(N0)₂Cl₄ and bright green f̲a̲c̲-W(NO)₃Cl₃. The second method involves controlled reaction of W(CO)₆ with two equivalents of ClN0 in CH₂Cl₂. It is initiated by traces of oxidant and probably proceeds via a catalytic, radical-chain mechanism that is described. If either reaction is effected in the presence of two equivalents of CH₃CN, then yellow-green W(N0)Cl₃(CH₃CN)₂ is the only nitrosyl-containing product formed. Polymeric [W(N0)₂Cl₂]n may be cleaved by a variety of Lewis bases, L, and (n̲-Bu)₃Sn(C₅H₅) to form W(N0)₂Cl₂L₂ (L = phosphine, phosphite, CH₃CN, etc.) and CpW(N0)₂Cl (Cp - ƞ⁵-C₅H₅), respectively, in good yields. The synthesis of the electron-rich nitrosyl complexes CpM(NO)L₂ (M = Cr, Mo, or W; L = P(0Me)₃, PMePh₂, P(n̲-Bu)₃, SbPh₃ or 1/2 (dppe)) is described. They are preparable in moderate to high yields by the reduction of the iodo dimers [CpM(NO)In]₂ (M = Cr, n = 1; M = Mo or W, n = 2) with sodium amalgam in THF ln the presence of the appropriate Lewis base, L, and they exhibit metal-dependent trends in vNO (Cr » Mo > W), δ ³¹P (Cr > Mo » W), and ²J₃₁p (Cr < Mo < W). These reduction reactions proceed via a number of transient intermediates, some of which are isolable. A unified mechanism for these reductive syntheses is proposed. The novel complexes, CpMo(NO)(ƞ⁴-trans-diene) (diene = acyclic conjugated diene) and CpMo(NO)(ƞ⁴-c̲i̲s̲-2,3-dlmethyl-butadiene)t are preparable in moderate yields by the reduction of [CpMo(NO)I₂]₂ with sodium amalgam in THF in the presence of the appropriate diene. The reaction between [CpMo(NO)I₂]₂ and C₄H₆•Mg•2(THF) results in the formation of a green, isolable oligomeric complex CpMo(NO)I(ƞ³-C₃H₄R) (where R = CH₂MgI and the nitrosyl oxygen acts as a Lewis base towards Mg) that can be hydrolyzed to CpMo(NO)I(ƞ³-C₄H₇) or converted to CpMo(NO)(ƞ⁴+-t̲r̲a̲n̲s̲-C₄H₆). These diene complexes have been fully characterized by conventional spectroscopic techniques (extensive ¹H and ¹³C NMR spectra being particularly informative) and by single-crystal X-ray structural determinations of CpMo(NO)(ƞ⁴-t̲r̲a̲n̲s̲-2,5-dimethyl-2,4-hexadiene) and CpMo(N0)(ƞ⁴-c̲i̲s̲-2,3-dimethyl-butadlene). A molecular orbital rationale for the structural and spectrocopic properties and relative stabilities of these c̲i̲s̲- and t̲r̲a̲n̲s̲-diene complexes is then presented.
Österreich-Ungarns Besatzungsmacht in Russisch-Polen während des Ersten Weltkriegs (1915-1918)
Creators: name: Scheer, Tamara
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2009

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 58 Nr. 4 (2009)
Spherically Symmetric Noncommutative Space: d = 4
Creators: name: Buric, Maja
name: Madore, John
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In order to find a noncommutative analog of Schwarzschild or Schhwarzschild-de Sitter blackhole we investigate spherically symmetric spaces generated by four noncommutative coordinates in the frame formalism. We present two solutions which however do not posess the prescribed commutative limit. Our analysis indicates that the appropriate noncommutative space might be found as a subspace of a higher-dimensional space.
description: 14 pages
Joachim Lerchenmueller, Die Geschichtswissenschaft in den Planungen des Sicherheitsdienstes der SS. Der SD-Historiker Hermann Löffler und seine Denkschrift "Entwicklung und Aufgaben der Geschichtswissenschaft in Deutschland".
Creators: name: Mühle, Eduard
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2003

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 52 Nr. 3 (2003)
Helmut Protze, Das älteste Stadtbuch der Königlich freien Bergstadt Göllnitz/Gelnica in der Unterzips und seine Sprache
Creators: name: Meier, Jörg
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2003

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 52 Nr. 4 (2003)
Życie i zagłada Żydów polskich 1939-1945. Relacje świadków
Creators: name: Friedrich, Klaus-Peter
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2005

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 54 Nr. 3 (2005)
Spezifika deutscher Besatzungspolitik in Warschau 1914-1916
Creators: name: Polsakiewicz, Marta
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2009

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 58 Nr. 4 (2009)
Spin-polarized Current-induced Instability in Spin-Valve with Antiferromagnetic Layer
Creators: name: Gomonay, H.
name: Loktev, V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In the framework of phenomenological model we consider dynamics of a compensated collinear antiferromagnet (AFM) in the presence of spin-polarised current. The model is based on the assumption that AFM spins are localised and spin torque is transferred to each magnetic sublattice independently. It is shown that in AFM spin current i) can be a source of the "negative friction"; and ii) modifies spin-wave frequencies. Equilibrium state of AFM can be destabilized by the current polarized in parallel to AFM vector. Threshold current at which the loss of stability takes place depends upon the magnetic anisotropy of AFM.
description: 9 pages, 3 figures, submitted to J. Mag. Soc. Japan
The statistical investigation of type Ib/c and II supernovae and their host galaxies
Creators: name: Hakobyan, A. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: This is a statistical study of the properties of type Ib/c and II supernovae and of the integral parameters of their spiral host galaxies. The methods of one-dimensional and multivariate statistics were applied to the data sample. It was found that the Ib/c supernovae are more concentrated radially toward the centers of the galaxies than those of type II. The distributions of the radial distances R(SN)/R(25) for the type Ib/c and II supernovae in active galaxies are more concentrated toward the center than in normal galaxies. This effect is stronger for type Ib/c than for type II supernovae.
description: 8 pages, 2 figures
Shape of primary proton spectrum in multi-TeV region from data on vertical muon flux
Creators: name: Yushkov, A. V.
name: Lagutin, A. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: It is shown, that primary proton spectrum, reconstructed from sea-level and underground data on muon spectrum with the use of QGSJET 01, QGSJET II, NEXUS 3.97 and SIBYLL 2.1 interaction models, demonstrates not only model-dependent intensity, but also model-dependent form. For correct reproduction of muon spectrum shape primary proton flux should have non-constant power index for all considered models, except SIBYLL 2.1, with break at energies around 10-15 TeV and value of exponent before break close to that obtained in ATIC-2 experiment. To validate presence of this break understanding of inclusive spectra behavior in fragmentation region in p-air collisions should be improved, but we show, that it is impossible to do on the basis of the existing experimental data on primary nuclei, atmospheric muon and hadron fluxes.
description: Submitted to Phys. Rev. D
Simple Two-Dimensional Model for the Elastic Origin of Cooperativity among Spin States of Spin-Crossover Complexes
Creators: name: Nishino, Masamichi
name: Boukheddaden, Kamel
name: Konishi, Yusuké
name: Miyashita, Seiji
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the origin of the cooperative nature of spin crossover (SC) between low spin (LS) and high spin (HS) states from the view point of elastic interactions among molecules. As the size of each molecule changes depending on its spin state, the elastic interaction among the lattice distortions provides the cooperative interaction of the spin states. We develop a simple model of SC with intra and intermolecular potentials which accounts for the elastic interaction including the effect of the inhomogeneity of the spin states, and apply constant temperature molecular dynamics based on the Nosé-Hoover formalism. We demonstrate that, with increase of the strength of the intermolecular interactions, the temperature dependence of the HS component changes from a gradual crossover to a first-order transition.
description: 4 pages, 4 figures
The ASTRA project: a doorway to future astrometry
Creators: name: Gai, Mario
name: Qi, Zhaoxiang
name: Lattanzi, Mario G.
name: Bucciarelli, Beatrice
name: Busonero, Deborah
name: Crosta, Mariateresa
name: Landini, Federico
name: Liao, Shilong
name: Luo, Hao
name: Mana, Giovanni
name: Méndez, Rene A.
name: Pisani, Marco
name: Riva, Alberto
name: Luque, Claudia San Martin
name: Sasso, Carlo P.
name: Tang, Zhenghong
name: Vecchiato, Alberto
name: Yong, Yu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Astrometric Science and Technology Roadmap for Astrophysics (ASTRA) is a bilateral cooperation between China and Italy with the goal of consolidating astrometric measurement concepts and technologies. In particular, the objectives include critical analysis of the Gaia methodology and performance, as well as principle demonstration experiments aimed at future innovative astrometric applications requiring high precision over large angular separations (one to 180 degrees). Such measurement technologies will be the building blocks for future instrumentation focused on the "great questions" of modern cosmology, like General Relativity validity (including Dark Matter and Dark Energy behavior), formation and evolution of structure like proto-galaxies, and planetary systems formation in bio compatibles environments. We describe three principle demonstration tests designed to address some of the potential showstoppers for high astrometric precision experiments. The three tests are focused on the key concepts of multiple fields telescopes, astrometric metrology and very fine sub-pixel precision (goal: <1/2000 pixel) in white light.
description: 12 pages, 12 figures; SPIE Astronomical Telescopes + Instrumentation, 2020, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV
Angular Distributions of B -> K ll Decays
Creators: name: Bobeth, Christoph
name: Hiller, Gudrun
name: Piranishvili, Giorgi
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We model-independently analyze the angular distributions of B -> K ll decays, l = e, mu, for low dilepton mass using QCD factorization. Besides the decay rate, we study the forward-backward asymmetry A_FB^l and a further observable, F_H^l, which gives rise to a flat term in the angular distribution. We find that in the Standard Model F_H^l ~ m_l^2, hence vanishing F_H^e and F_H^mu of around 2% (exact value depends on cuts) with a very small theoretical uncertainty of a few percent. We also give predictions for R_K, the ratio of B -> K mu mu to B -> K ee decay rates. We analytically show using large recoil symmetry relations that in the Standard Model R_K equals one up to lepton mass corrections of the order 10^(-4). The New Physics reach of the observables from the B -> K ll angular analysis is explored together with R_K and the B_s -> ll and B -> X_s ll branching ratios for both l = e and l = mu. We find substantial room for signals from (pseudo-) scalar and tensor interactions beyond the Standard Model. Experimental investigations of the B -> K mu mu angular distributions are suitable for the LHC environment and high luminosity B factories, where also studies of the electron modes are promising.
description: 1 + 28 pages, 8 figures, uses JHEP3.cls; affiliation renamed, typos corrected, comments on electroweak corrections + 1 reference added
Evidence for gravitational lensing of GRB 200716C
Creators: name: Yang, Xing
name: Lü, Hou-Jun
name: Yuan, Hao-Yu
name: Rice, Jared
name: Zhang, Zhao
name: Zhang, Bin-Bin
name: Liang, En-Wei
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Observationally, there is a small fraction of Gamma-ray bursts (GRBs) with prompt emission observed by Fermi/GBM that are composed of two pulses. Occasionally, the distance to a GRB may be lensed when a high mass astrophysical object resides in the path between the GRB source and observer. In this paper, we describe GRB 200716C, which has a two-pulse emission and duration of a few seconds. We present a Bayesian analysis identifying gravitational lensing in both temporal and spectral properties, and calculate the time delay ($Δt\sim 1.92$ s) and magnification ($γ\sim 1.5$) between those two pulses based on the temporal fits. One can roughly estimate the lens mass to be about $2.4\times 10^{5}~M_{\odot}$ in the rest frame. We also calculate the false alarm probability for this detection to be about 0.07\% with trial factors, and a present-day number density of about $808 \rm~Mpc^{-3}$ with an energy density $Ω\sim 1.4\times 10^{-3}$. If the first pulse of this GRB near the trigger time is indeed gravitationally echoed by a second pulse, GRB 200716C may be a short GRB candidate with extended emission.
description: 22 pages, 2 tables, 7 figures, ApJL in press, added two references
iCub
Creators: name: Natale, Lorenzo
name: Bartolozzi, Chiara
name: Nori, Francesco
name: Sandini, Giulio
name: Metta, Giorgio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: In this chapter we describe the history and evolution of the iCub humanoid platform. We start by describing the first version as it was designed during the RobotCub EU project and illustrate how it evolved to become the platform that is adopted by more than 30 laboratories world wide. We complete the chapter by illustrating some of the research activities that are currently carried out on the iCub robot, i.e. visual perception, event driven sensing and dynamic control. We conclude the Chapter with a discussion of the lessons we learned and a preview of the upcoming next release of the robot, iCub 3.0.
Christian Raitz von Frentz, A Lesson Forgotten. Minority Protection under the League of Nations. The Case of the German Minority in Poland, 1920-1934
Creators: name: Niendorf, Mathias
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2003

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 52 Nr. 4 (2003)
Van der Waals Frictional Drag induced by Liquid Flow in Low- Dimensional Systems
Creators: name: Volokitin, A. I.
name: Persson, B. N. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the van der Waals frictional drag force induced by liquid flow in low-dimensional systems (2D and 1D electron systems, and 2D and 1D channels with liquid). We find that for both 1D and 2D systems, the frictional drag force induced by liquid flow may be several orders of magnitude larger than the frictional drag induced by electronic current.
description: 10 pages, 4 figures
Studies in Marine Natural Products : Onchidoris bilamellata, Nanaimoal and Capnellene
Creators: name: Hellou, Jocelyne
Publisher: name: University of British Columbia
Year: 2010

description: The following thesis is divided into three chapters. The first describes the isolation and identification of a sphingolipid L from the methanolic skin extract of the British Columbia nudibranch Onchidoris bilamellata. The long chain base has been identified as (E)-l,3-dihydroxy-2-amino-16-methyl-4-octadecene (1̲3) and the fatty acid moiety as palmitic acid (1̲2). This ceramide possesses antibacterial activity towards the microorganisms Bacillus subtilis and Staphylococcus aureus. [formula omitted] The second chapter presents our attempt to synthesize a hypothetical structure of nanaimoal (2̲4), a marine sesquiterpenoid, isolated from the British Columbia nudibranch Acanthadoris nanaimoensis. The proposed route envisaged photolysis of a 2,2,10,10-tetrasubstituted cyclodecanone. This work lend to a study of the solution photochemistry of 2,2,10-trimethyl-cyclodecanone (3̲5). [formula omitted] The last chapter outlines studies directed toward the synthesis of capnellene (5̲1), a tricyclopentanoid obtained by Djerassi and co-workers from the soft coral Capnel laimbricata. Starting with an improved synthesis of the known ketone Δ¹̕̕̕⁵-bicyclo[3.3.0] octen-2-one (1̲3̲8), an acylation method was developed for the preparation of Δ¹̕⁵-3-carboethoxybicyclo-[3.3.0] octen-2-one (1̲6̲0). The procedure is of general utility and has been extended to related ketones. This unsaturated keto-ester underwent a Michael addition with methyl vinyl ketone to give 1̲7̲8. Selective Knoevenagal condensation of the methyl ketone produced Δ¹̕⁵-3-carboethoxy-3-(dimethyl-3-methyl-3-butenyl-4,4-dicarboxylate)-bicyclo[3.3.0] octen-2-one (179). Reduction of the unsaturated ketone and dehydration of the allylic alcohol produced a 1,1,3,4-tetrasubstituted cyclopentadiene derivative 1̲8̲1. Intramolecular Diels-Alder cyclization of the latter afforded the tetracyclic tricarboxylic ester 1̲8̲2. Selective hydrolysis of the malonic estertricarboxylic ester 1̲8̲2 followed by decarboxylation led to 1̲8̲3, a key intermediate for the ultimate construction of the capnellane ring system. [formula omitted]
Onset of internal transport barriers in tokamaks
Creators: name: Osorio, L. A.
name: Roberto, M.
name: Caldas, I. L.
name: Viana, R. L.
name: Elskens, Y.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Barriers have been identified in magnetically confined plasmas reducing the particle transport and improving the confinement. One of them, the primary shearless barriers are associated to extrema of non-monotonic plasma profiles. Previously, we identified these barriers in a model described by a map that allows the integration of charged particles motion in drift waves for a long time scale. In this work, we show how the existence of these robust barriers depends on the fluctuation amplitude and on the electric shear. Moreover, we also find control parameter intervals for which these primary barriers onset and break-up are recurrent. Another noticeable feature, in these transitions, is the appearance of a layer of particle trajectory stickiness after the shearless barrier break-up or before its onset. Besides the mentioned primary barriers, we also observe sequences of secondary shearless barriers, not reported before, created and destroyed by a sequence of bifurcations as the main control parameters, the fluctuation amplitude and electric shear, are varied. Furthermore, in these bifurcations, we also find hitherto unknown double and triple secondary shearless barriers which constitute a noticeable obstacle to the chaotic transport.
description: 12 pages, 28 figures. This article has been accepted by the Journal Physics of Plasmas. It can be found at: https://doi.org/10.1063/5.0056428
Elżbieta Kaszuba, System propagandy państwowej obozu rządzącego w Polsce w latach 1936-1939
Creators: name: Hein, Heidi
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2005

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 54 Nr. 3 (2005)
Large-scale phase retrieval
Creators: name: Chang, Xuyang
name: Bian, Liheng
name: Zhang, Jun
Publisher: name: arXiv
Year: 2021
Subjects: subject: Image and Video Processing (eess.IV)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: High-throughput computational imaging requires efficient processing algorithms to retrieve multi-dimensional and multi-scale information. In computational phase imaging, phase retrieval (PR) is required to reconstruct both amplitude and phase in complex space from intensity-only measurements. The existing PR algorithms suffer from the tradeoff among low computational complexity, robustness to measurement noise and strong generalization on different modalities. In this work, we report an efficient large-scale phase retrieval technique termed as LPR. It extends the plug-and-play generalized-alternating-projection framework from real space to nonlinear complex space. The alternating projection solver and enhancing neural network are respectively derived to tackle the measurement formation and statistical prior regularization. This framework compensates the shortcomings of each operator, so as to realize high-fidelity phase retrieval with low computational complexity and strong generalization. We applied the technique for a series of computational phase imaging modalities including coherent diffraction imaging, coded diffraction pattern imaging, and Fourier ptychographic microscopy. Extensive simulations and experiments validate that the technique outperforms the existing PR algorithms with as much as 17dB enhancement on signal-to-noise ratio, and more than one order-of-magnitude increased running efficiency. Besides, we for the first time demonstrate ultra-large-scale phase retrieval at the 8K level (7680$\times$4320 pixels) in minute-level time.
Calculations of in-gap states of ferromagnetic spin chains on \textit{s}-wave wide-band superconductors
Creators: name: Mier, Cristina
name: Choi, deung-Jang
name: Lorente, Nicolás
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Magnetic impurities create in-gap states on superconductors. Recent experiments explore the topological properties of one-dimensional arrays of magnetic impurities on superconductors, because in certain regimes p-wave pairing can be locally induced leading to new topological phases. A by-product of the new accessible phases is the appearance of zero-energy edge states that have non-Abelian exchange properties and can be used for topological quantum computation. Despite the large amount of theory devoted to these systems, most treatments use approximations that render their applicability limited when comparing with usual experiments of 1-D impurity arrays on wide-band superconductors. These approximations either involve tight-binding-like approximations where the impurity energy scales match the minute energy scale of the superconducting gap and are many times unrealistic, or they assume strongly-bound in-gap states. Here, we present a theory for s-wave superconductors based on a wide-band normal metal, with any possible energy scale for the magnetic impurities. The theory is based on free-electron Green's functions. We include Rashba coupling and compare with recent experimental results, permitting us to analyze the topological phases and the experimental edge states. The infinite-chain properties can be analytically obtained, giving us a way to compare with finite-chain calculations. We show that it is possible to converge to the infinite limit by doing finite numerical calculation, paving the way for numerical calculations not based on analytical Green's functions.
An improved method for estimating source densities using the temporal distribution of Cosmological Transients
Creators: name: Howell, E.
name: Coward, D.
name: Burman, R.
name: Blair, D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: It has been shown that the observed temporal distribution of transient events in the cosmos can be used to constrain their rate density. Here we show that the peak flux--observation time relation takes the form of a power law that is invariant to the luminosity distribution of the sources, and that the method can be greatly improved by invoking time reversal invariance and the temporal cosmological principle. We demonstrate how the method can be used to constrain distributions of transient events, by applying it to Swift gamma-ray burst data and show that the peak flux--observation time relation is in good agreement with recent estimates of source parameters. We additionally show that the intrinsic time dependence allows the method to be used as a predictive tool. Within the next year of Swift observation, we find a 50% chance of obtaining a peak flux greater than that of GRB 060017 -- the highest Swift peak flux to date -- and the same probability of detecting a burst with peak flux > 100 photons s^{-1} cm^{-2} within 6 years.
description: Submitted to ApJ Letters
Ingo Haar, Historiker im Nationalsozialismus. Deutsche Geschichtswissenschaft und der "Volkstumskampf" im Osten.
Creators: name: Wauker, Marco
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2003

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 52 Nr. 3 (2003)
Local evidence for collective spin excitations in the distorted kagome antiferromagnet Pr$_3$BWO$_9$
Creators: name: Zeng, K. Y.
name: Song, F. Y.
name: Tian, Z. M.
name: Chen, Qiao
name: Wang, Shun
name: Liu, Bo
name: Li, Shiliang
name: Ling, L. S.
name: Tong, W.
name: Ma, Long
name: Pi, Li
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report the local probe investigation of a frustrated antiferromagnet Pr$_3$BWO$_9$ with the distorted kagome lattice. Absence of magnetic order or spin freezing is indicated by the spectral analysis down to 0.3 K and specific heat measurements down to 0.09 K. The Knight shifts show an upturn behavior with the sample cooling down, which is further suppressed by external field. For the spin dynamics, gapped spin excitation is observed from the temperature dependence of spin-lattice relaxation rates, with the gap size proportional to the applied magnetic field intensity. Comparatively, an unexpected sharp peak is observed in the nuclear spin-spin relaxation rate data at $T^*\sim 4-5$ K. These results indicate an unconventional persistent fluctuating paramagnetic ground state with antiferromagnetic collective spin excitations in the strongly frustrated spin system.
description: 6 pages, 4 figures