cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
On the relations between the zeros of a polynomial and its Mahler measure
Creators: name: Ounaies, Myrial
name: Rhin, Georges
name: Sac-Épée, Jean Marc
Publisher: name: arXiv
Year: 2021
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11C08 11R06, 11C08, 12D10

description: In this work, we are dealing with some properties relating the zeros of a polynomial and its Mahler measure. We provide estimates on the number of real zeros of a polynomial, lower bounds on the distance between the zeros of a polynomial and non-zeros located on the unit circle and a lower bound on the number of zeros of a polynomial in the disk $\{\vert x-1\vert<1\}$.
Turbulent Convection in Subglacial Lakes
Creators: name: Couston, Louis-Alexandre
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: Subglacial lakes are isolated, cold-temperature and high-pressure water environments hidden under ice sheets, which might host extreme microorganisms. Here, we use two-dimensional direct numerical simulations in order to investigate the characteristic temperature fluctuations and velocities in freshwater subglacial lakes as functions of the ice overburden pressure, $p_i$, the water depth, $h$, and the geothermal flux, $F$. Geothermal heating is the unique forcing mechanism as we consider a flat ice-water interface. Subglacial lakes are fully convective when $p_i$ is larger than the critical pressure $p_*\approx 2848$ dbar, but self organize into a lower convective bulk and an upper stably-stratified layer when $p_i < p_*$, because of the existence at low pressure of a density maximum at temperature $T_d$ greater than the freezing temperature $T_f$. For both high and low $p_i$, we demonstrate that the Nusselt number $Nu$ and Reynolds number $Re$ satisfy classical scaling laws provided that an effective Rayleigh number $Ra_{eff}$ is considered. We show that the convective and stably-stratified layers at low pressure are dynamically decoupled at leading order because plume penetration is weak and induces limited entrainment of the stable fluid. From the empirical power law equation for $Nu$ with $Ra_{eff}$, we derive two sets of closed-form expressions for the variables of interest, including the unknown bottom temperature, in terms of the problem parameters $p_i$, $h$ and $F$. The two predictions correspond to two limiting regimes obtained when the effective thermal expansion coefficient is either approximately constant or linearly proportional to the temperature difference driving the convection.
description: 29 pages, 11 figures
Robinson-Trautman spacetimes with an electromagnetic field in higher dimensions
Creators: name: Ortaggio, Marcello
name: Podolsky, Jiri
name: Zofka, Martin
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate higher dimensional Robinson-Trautman spacetimes with an electromagnetic field aligned with the hypersurface orthogonal, non-shearing, expanding geodesic null congruence. After integrating the system of Einstein-Maxwell equations with an arbitrary cosmological constant, we present the complete family of solutions. In odd spacetime dimensions they represent (generalized) Reissner-Nordstrom-de Sitter black holes. The event horizon (more generically, the transverse space) may be any Einstein space, and the full metric is specified by three independent parameters related to mass, electric charge and cosmological constant. These solutions also exhaust the class of Robinson-Trautman spacetimes with an aligned Maxwell-Chern-Simons field (the CS term must vanish because of the alignment assumption and of the Einstein equations). In even dimensions an additional magnetic "monopole-like" parameter is also allowed provided now the transverse space is an (almost-)Kahler Einstein manifold. The Weyl tensor of all such solutions is of algebraic type D. We also consider the possible inclusion of aligned pure radiation.
description: 17 pages
Response of the shore crabs Hemigrapsus oregonesis and Hemigrapsus nudus to paralytic shellfish toxins
Creators: name: Barber, Kathleen Gladys
Publisher: name: University of British Columbia
Year: 2010

description: The following research deals with the response of the small shore crabs, Hemigrapsus oreqonesis and Hemigrapsus nudus to paralytic shellfish toxins (PST). These shore crabs were shown to develop a remarkable seasonal resistance to administered saxitoxin (STX). No similar change in sensitivity was found after administration of tetrodotoxin (TTX), another marine neurotoxin with similar actions to the PST. Resistance to STX in the small shore crabs was linked to the presence of PST in the viscera, and this in turn was related to the presence of toxic dinoflagellate blooms in the area. Furthermore, this research provides, for the first time, evidence of a protein component (MW 145,000 daltons) which appears to be associated with acquired resistance to PST in the shore crab. In addition, this protein component was shown to appear in sensitive crab extracts after the administration of low doses of saxitoxin and tetrodotoxin in vivo.
Call for Papers: Business Models at the Crossroad of Responsible Innovation, Sustainability and Resilience
Creators: name: Oftedal, E.
name: Bertella, G.
name: Grzegorczyk, M.
name: Hill, P.M.
name: Lanka, S.
Publisher: name: Zenodo
Year: 2020
Subjects: responsible investments
climate change
sustainability

description: CALL SPECIAL ISSUE This is the first international special issue for the Journal of Contemporary Administration (RAC). The Journal of Contemporary Administration (Revista de Administração Contemporânea – RAC) was established in 1997 and is published bimonthly by ANPAD (Brazilian Academy of Management), with open-access to its full text (peer-reviewed) content online. It is registered under ISSN 1982-7849 (online) and ISSN 1415-6555 (print version from 1997 to 2010). Anpad is the #2 scientific association in the field of business management (in terms of #members). RAC is the leader publication in business management in the main economy in Latin America, Brazil (the #8 economy all over the world). The journal publishes articles on theoretical development and theoretical-empirical work in the area of Administration and Accounting, aligned with Open Science practices: open data, materials and open source, as well as the dissemination of additional information related to the editorial process, also abiding by the principles of COPE – Committee on Publication Ethics for scholarly publication. The Journal of Contemporary Administration (RAC) is the leading academic journal in its field, with a high citation rate and high quality peer-reviewed contributions (https://rac.anpad.org.br/index.php/rac/article/view/1370/1427). Submission of Abstract Deadline: May 15th, 2020
 Submission of Full Paper Deadline: June 30th, 2020
 Review Process Ends: September 30th, 2020
 Special Issue attempt of publication: November, 2020
Cum pot comunica cercetătorii direct cu publicul.pdf
Creators: name: Cocea, Madalina
Publisher: name: figshare
Year: 2021
Subjects: subject: 200101 Communication Studies
subject: FOS: Media and communications

description: Fie că este vorba despre podcasturi, conferinţe fascinante sau prezenţa la zilele porţilor deschise, despre site-ul personal sau un blog cu nouăţi din laborator, cercetătorul are numeroase modalităţi de a intra în legătură cu un public interesat de ştiinţă.
Neutron drop trapped in axially deformed external fields
Creators: name: Ding, Xiaohan
name: Hu, Jinniu
name: Zhang, Ying
name: Shen, Hong
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The neutron drop is firstly investigated in an axially symmetric harmonic oscillator (ASHO) field, whose potential strengths of different directions can be controlled artificially. The shape of the neutron drop will change from spherical to oblate or prolate according to the anisotropy of the external field. With the potential strength increasing in the axial direction, the neutron prefers to occupy the orbital perpendicular to the symmetry axis. On the contrary, the neutron likes to stay in the orbital parallel to the symmetry axis when the potential strength increases in the radial direction. Meanwhile, when the potential strength of one direction disappears, the neutron drop cannot bind together. These investigations are not only helpful to simulate the properties of neutrons in finite nuclei but also provide the theoretical predictions to the future artificial operations on the nuclei like the ultracold atom system, for a deeper realization of quantum many-body systems.
description: 14 pages, 4 figures, 1 table, accepted by Nucl. Phys. A
Systematics of semi-microscopic proton-nucleus optical potential at low energies relevant to nuclear astrophysics
Creators: name: Vagena, E.
name: Axiotis, M.
name: Dimitriou, P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Astrophysical models studying the origin of the p-nuclei require knowledge of the reaction rates of photodisintegrations and capture reactions. Since experimental data at astrophysically relevant energies are limited, reaction rate calculations rely on Hauser-Feshbach (HF) theory predictions. The HF theory requires nuclear physics input such as masses, level densities, $γ$-ray strength functions and proton-nucleus optical potentials (pOMP). The scope of this work is to improve a global semi-microscopic pOMP at energies relevant to the p-process. This is achieved by adjusting the normalization parameters of the OMP to all available proton-capture cross sections measured at low energies. By establishing the systematic behaviour of these parameters, one expects to enhance the predictive power of the pOMP when expanding to mass regions where no data exists. The HF calculations were obtained using TALYS code. The normalization parameters for the real and imaginary central potentials ($λ_V$ and $λ_W$) were adjusted to fit the proton data in the energy range where the cross-section are independent of the other nuclear inputs. Results show that the $λ_V$ parameter has a strong mass dependence that can be described by a second-degree polynomial function for A $\leq$ 100 and an exponential increase for 100 < A < 162. Though variations of the $λ_W$ have a smaller effect on the calculations, a global increase by 50$\%$ improves the results for certain nuclei without affecting the rest of the cases. The resulting adjustment functions were obtained by fitting all suitable proton data and can be used with reasonable confidence to generate the global semi-microscopic pOMP for nuclei in the medium to heavy mass region. For better statistics, more low-energy (p,$γ$) cross section data are needed for heavier nuclei with mass A $>$ 100.
description: pages 20, 12 figures
Stokes-vector evolution in a weakly anisotropic inhomogeneous medium
Creators: name: Kravtsov, Yu. A.
name: Bieg, B.
name: Bliokh, K. Yu.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Optics (physics.optics)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Equation for evolution of the four-component Stokes vector in weakly anisotropic and smoothly inhomogeneous media is derived on the basis of quasi-isotropic approximation of the geometrical optics method, which provides consequent asymptotic solution of Maxwell equations. Our equation generalizes previous results, obtained for the normal propagation of electromagnetic waves in stratified media. It is valid for curvilinear rays with torsion and is capable to describe normal modes conversion in the inhomogeneous media. Remarkably, evolution of the Stokes vector is described by the Bargmann-Michel-Telegdi equation for relativistic spin precession, whereas the equation for the three-component Stokes vector resembles the Landau-Lifshitz equation for spin precession in ferromegnetic systems. General theory is applied for analysis of polarization evolution in a magnetized plasma. We also emphasize fundamental features of the non-Abelian polarization evolution in anisotropic inhomogeneous media and illustrate them by simple examples.
description: 16 pages, 3 figures, to appear in J. Opt. Soc. Am. A
Limits on the 2.2 microns contrast ratio of the close orbiting planet HD 189733b
Creators: name: Barnes, J. R.
name: Barman, Travis S.
name: Prato, L.
name: Segransan, D.
name: Jones, H. R. A.
name: Leigh, C. J.
name: Cameron, A. Collier
name: Pinfield, D. J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We obtained 238 spectra of the close orbiting extrasolar giant planet HD 189733b with resolution R ~ 15,000 during one night of observations with the near infrared spectrograph, NIRSPEC, at the Keck II Telescope. We have searched for planetary absorption signatures in the 2.0 - 2.4 micron region where H_2O and CO are expected to be the dominant atmospheric opacities. We employ a phase dependent orbital model and tomographic techniques to search for the planetary absorption signatures in the combined stellar and planetary spectra. Because potential absorption signatures are hidden in the noise of each single exposure, we use a model list of lines to apply a spectral deconvolution. The resulting mean profile possesses a S/N ratio that is 20 times greater than that found in individual lines. Our spectral timeseries thus yields spectral signatures with a mean S/N = 2720. We are unable to detect a planetary signature at a contrast ratio of log_10(F_p/F_*) = -3.40, with 63.8 per cent confidence. Our findings are not consistent with model predictions which nevertheless give a good fit to mid-infrared observations of HD 189733. The 1-sigma result is a factor of 1.7 times less than the predicted 2.185 micron planet/star flux ratio of log_10(F_p/F_*) ~ -3.16.
description: 9 pages, 3 Figures
Effect of surface roughness on rate-dependent slip in simple fluids
Creators: name: Priezjev, Nikolai V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Molecular dynamics simulations are used to investigate the influence of molecular-scale surface roughness on the slip behavior in thin liquid films. The slip length increases almost linearly with the shear rate for atomically smooth rigid walls and incommensurate structures of the liquid/solid interface. The thermal fluctuations of the wall atoms lead to an effective surface roughness, which makes the slip length weakly dependent on the shear rate. With increasing the elastic stiffness of the wall, the surface roughness smoothes out and the strong rate dependence is restored again. Both periodically and randomly corrugated rigid surfaces reduce the slip length and its shear rate dependence.
description: 15 pages, 5 figures; submitted to J. Chem. Phys
Leveraging Two Types of Global Graph for Sequential Fashion Recommendation
Creators: name: Ding, Yujuan
name: Ma, Yunshan
name: Wong, Wai Keung
name: Chua, Tat-Seng
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Retrieval (cs.IR)
subject: Multimedia (cs.MM)
subject: FOS: Computer and information sciences

description: Sequential fashion recommendation is of great significance in online fashion shopping, which accounts for an increasing portion of either fashion retailing or online e-commerce. The key to building an effective sequential fashion recommendation model lies in capturing two types of patterns: the personal fashion preference of users and the transitional relationships between adjacent items. The two types of patterns are usually related to user-item interaction and item-item transition modeling respectively. However, due to the large sets of users and items as well as the sparse historical interactions, it is difficult to train an effective and efficient sequential fashion recommendation model. To tackle these problems, we propose to leverage two types of global graph, i.e., the user-item interaction graph and item-item transition graph, to obtain enhanced user and item representations by incorporating higher-order connections over the graphs. In addition, we adopt the graph kernel of LightGCN for the information propagation in both graphs and propose a new design for item-item transition graph. Extensive experiments on two established sequential fashion recommendation datasets validate the effectiveness and efficiency of our approach.
On the photon polarization in radiative B -> phi K gamma decay
Creators: name: Orlovsky, V. D.
name: Shevchenko, V. I.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The photon polarization in radiative decays B -> Y gamma is known to be a subtle probe of the effective Lagrangian structure and possible New Physics effects. We discuss exclusive decay mode B -> phi K gamma where the experimentally distinct final state makes analysis especially promising. The possibility to extract information on the photon polarization out of the data entirely depends on the partial waves interference pattern in the phi K system.
description: RevTeX, 6 pages, 1 figure; the journal version
Porting a LES Model to Single Precision: Are the Performance Benefits worth the Precision Loss?
Creators: name: Azizi Tarksalooyeh, Victor
name: Attema, Jisk
name: Jansson, Frederik
Publisher: name: Zenodo
Year: 2021
Subjects: Single Precision
LES

description: We introduce single precision floating point fields into DALES. DALES is an atmospheric large-eddy simulation program used for research and education. It simulates atmospheric processes including turbulence, convection, clouds, precipitation, and radiative effects. DALES is participating as a ESIWACE2 service 1 project. For this project we have improved DALES with explicit interfaces to the point that the code is now strongly typed. This means that we where able to easily introduce variable precision floating points into the code with compile time guarantees. Preliminary scaling results with single precision prognostic fields and a single precision Poisson solver already show a speed up of up to 35%, depending on the core count. Concluding, our efforts lead to an overall code quality and maintainability improvement and we achieved a significant speed up of DALES without a noticeable loss of precision.
description: {"references": ["https://doi.org/10.5194/gmd-3-415-2010", "https://doi.org/10.1098/rsta.2020.0073", "https://doi.org/10.1029/2011MS000056"]}
SupplFigures and Tables from Creation of a peptide database of corneous beta-proteins of marine turtles for the identification of tortoiseshell: archaeological combs as case study
Creators: name: Solazzo, Caroline
name: Soulat, Jean
name: Cleland, Timothy
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: Molecular Biology
subject: 30199 Analytical Chemistry not elsewhere classified
subject: FOS: Chemical sciences

description: Supplementary figures and tables
Minimum Long-Loop Feedback Vertex Set and Network Dismantling
Creators: name: Li, Tianyi
name: Zhang, Pan
name: Zhou, Hai-Jun
Publisher: name: arXiv
Year: 2021
Subjects: subject: Social and Information Networks (cs.SI)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Network dismantling aims at breaking a network into disconnected components, and attacking vertices that intersect with many loops has proven to be a most efficient strategy. But the existing loop-focusing methods treat the short loops within densely connected local clusters (e.g., cliques) as equally important as the long loops connecting different clusters. Here we propose for highly clustered artificial and real-world networks a bipartite factor-graph formulation that retains all the long loops while simplifies the local dense clusters as individual factor nodes. We develop a mean-field theory for the associated long-loop feedback vertex set problem and apply its message-passing equation as a solver for network dismantling. The proposed factor-graph loop algorithm outperforms the current state-of-the-art graph loop algorithms by a considerable margin on various real networks. Further improvement in dismantling performance is achievable by optimizing the choice of the local dense clusters.
Peptide details from Creation of a peptide database of corneous beta-proteins of marine turtles for the identification of tortoiseshell: archaeological combs as case study
Creators: name: Solazzo, Caroline
name: Soulat, Jean
name: Cleland, Timothy
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: Molecular Biology
subject: 30199 Analytical Chemistry not elsewhere classified
subject: FOS: Chemical sciences

description: List of the 187 markers with MS/MS spectra and identification information
Absolute Stability Limit for Relativistic Charged Spheres
Creators: name: Giuliani, Alessandro
name: Rothman, Tony
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We find an exact solution for the stability limit of relativistic charged spheres for the case of constant gravitational mass density and constant charge density. We argue that this provides an absolute stability limit for any relativistic charged sphere in which the gravitational mass density decreases with radius and the charge density increases with radius. We then provide a cruder absolute stability limit that applies to any charged sphere with a spherically symmetric mass and charge distribution. We give numerical results for all cases. In addition, we discuss the example of a neutral sphere surrounded by a thin, charged shell.
description: 25 pages, 1 figure 1 June 07: Replaced with added citations to prior work along same lines
Epitaxial Growth of Quasi-One-Dimensional Bismuth-Halide Chains with Topological Non-Trivial Edge States
Creators: name: Zhuang, Jincheng
name: Li, Jin
name: Liu, Yundan
name: Mu, Dan
name: Yang, Ming
name: Liu, Yani
name: Zhou, Wei
name: Hao, Weichang
name: Zhong, Jianxin
name: Du, Yi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Quantum spin Hall insulators have one-dimensional (1D) spin-momentum locked topological edge states (ES) inside the bulk band gap, which can serve as dissipationless channels for the practical applications in low consumption electronics and high performance spintronics. However, the clean and atomically sharp ES serving as ideal 1D conducting channels are still lack. Here, we report the formation of the quasi-1D Bi4I4 nanoribbons on the surface of Bi(111) with the support of the graphene-terminated 6H-SiC(0001) and the direct observations of the topological ES at the step edge by scanning tunneling microscopy and spectroscopic-imaging results. The ES reside surround the edge of Bi4I4 nanoribbons and exhibits remarkable robustness against non time reversal symmetry perturbations. The theoretical simulations verify the topological non-trivial character of 1D ES, which is retained after considering the presence of the underlying Bi(111). Our study supports the existence of topological ES in Bi4I4 nanoribbons, paving the way to engineer the novel topological features by using the nanoribbons as the 1D building block.
SpaceHub: A high-performance gravity integration toolkit for few-body problems in astrophysics
Creators: name: Wang, Yi-Han
name: Leigh, Nathan
name: Liu, Bin
name: Perna, Rosalba
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We present the open source few-body gravity integration toolkit {\tt SpaceHub}. {\tt SpaceHub} offers a variety of algorithmic methods, including the unique algorithms AR-Radau, AR-Sym6, AR-ABITS and AR-chain$^+$ which we show out-perform other methods in the literature and allow for fast, precise and accurate computations to deal with few-body problems ranging from interacting black holes to planetary dynamics. We show that AR-Sym6 and AR-chain$^+$, with algorithmic regularization, chain algorithm, active round-off error compensation and a symplectic kernel implementation, are the fastest and most accurate algorithms to treat black hole dynamics with extreme mass ratios, extreme eccentricities and very close encounters. AR-Radau, the first regularized Radau integrator with round off error control down to 64 bits floating point machine precision, has the ability to handle extremely eccentric orbits and close approaches in long-term integrations. AR-ABITS, a bit efficient arbitrary precision method, achieves any precision with the least CPU cost compared to other open source arbitrary precision few-body codes. With the implementation of deep numerical and code optimization, these new algorithms in {\tt SpaceHub} prove superior to other popular high precision few-body codes in terms of performance, accuracy and speed.
description: Submitted to MNRAS. Comments are welcome
Nonperturbative ghost dynamics in the maximal Abelian gauge
Creators: name: Capri, M. A. L.
name: Dudal, D.
name: Gracey, J. A.
name: Sorella, S. P.
name: Verschelde, H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct the effective potential for the ghost condensate in the maximal Abelian gauge. This condensate is an order parameter for a global continuous symmetry, which is spontaneously broken since a nonvanishing value of lowers the vacuum energy. The associated Goldstone mode turns out to be unphysical.
description: 16 pages. v2: version accepted for publication in JHEP
Relative Value of Short-, Mid-, and Long-Duration Storage Technologies in Reliable Wind and Solar Electricity Systems
Creators: name: Li, Anna X.
name: Dowling, Jacqueline A.
name: Ruggles, Tyler H.
name: Virguez, Edgar
name: Caldeira, Ken
name: Lewis, Nathan S.
Publisher: name: Zenodo
Year: 2022
Subjects: Macro-Energy Systems
Variable Renewables
Short-Duration Storage
Mid-Duration Storage
Long-Duration Storage

description: Carbon emission policies around the world call for the transition of electricity generation to renewable resources, primarily solar and wind. However, solar and wind are intermittent by nature, motivating energy storage to match electricity supply and demand. Short-duration storage can smooth sharp peaks in generation by charging and discharging daily, and long-duration storage can accommodate seasonal variation in generation by storing vast amounts of energy over seasons and even years. Here, we use a macro-energy model to analyze the value several promising storage technologies. We find that multiple storage technologies can compete to fill different roles, storing energy over a range of timescales. Our analysis indicates that long-duration (low-energy capacity cost) storage can largely fill short- and mid-duration storage needs. This points toward geographic, resource, and sociopolitical advantages beyond the cost of storage technologies guiding investment and policy decisions relevant to energy storage.
Experimental Observation of Localized Interfacial Phonon Modes
Creators: name: Cheng, Zhe
name: Li, Ruiyang
name: Yan, Xingxu
name: Jernigan, Glenn
name: Shi, Jingjing
name: Liao, Michael E.
name: Hines, Nicholas J.
name: Gadre, Chaitanya A.
name: Idrobo, Juan Carlos
name: Lee, Eungkyu
name: Hobart, Karl D.
name: Goorsky, Mark S.
name: Pan, Xiaoqing
name: Luo, Tengfei
name: Graham, Samuel
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Interfaces impede heat flow in micro/nanostructured systems. Conventional theories for interfacial thermal transport were derived based on bulk phonon properties of the materials making up the interface without explicitly considering the atomistic interfacial details, which are found critical to correctly describing thermal boundary conductance (TBC). Recent theoretical studies predicted the existence of localized phonon modes at the interface which can play an important role in understanding interfacial thermal transport. However, experimental validation is still lacking. Through a combination of Raman spectroscopy and high-energy resolution electron energy-loss spectroscopy (EELS) in a scanning transmission electron microscope, we report the first experimental observation of localized interfacial phonon modes at ~12 THz at a high-quality epitaxial Si-Ge interface. These modes are further confirmed using molecular dynamics simulations with a high-fidelity neural network interatomic potential, which also yield TBC agreeing well with that measured from time-domain thermoreflectance (TDTR) experiments. Simulations find that the interfacial phonon modes have obvious contribution to the total TBC. Our findings may significantly contribute to the understanding of interfacial thermal transport physics and have impact on engineering TBC at interfaces in applications such as electronics thermal management and thermoelectric energy conversion.
Forschungseinrichtungen und Kooperationsperspektiven deutscher und französicher Wissenschaftler auf dem Gebiet der Arbeitergeschichte/Arbeiterbewegung
Creators: name: Friedemann, Peter
Publisher: name: Moving the Social
Year: 2014

description: This is the contribution "Forschungseinrichtungen und Kooperationsperspektiven deutscher und französicher Wissenschaftler auf dem Gebiet der Arbeitergeschichte/Arbeiterbewegung" of MTS 14 (1993).
description: Moving the Social, Vol 14 (1993): Forschungen zur Arbeiterschaft und Arbeiterbewegung in Frankreich
Resolving the Intrinsic Bandgap and Edge Effect of BiI3 Film Epitaxially Grown on Graphene
Creators: name: Mu, Dan
name: Zhou, Wei
name: Liu, Yundan
name: Li, Jin
name: Yang, Ming
name: Zhuang, Jincheng
name: Du, Yi
name: Zhong, Jianxin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Two-dimensional materials with layered structures, appropriate bandgap, and high carrier mobilities have gathered tremendous interests due to their potential applications in optoelectronic and photovoltaic devices. Here, we report the growth of BiI3 thin film with controllable atomic thickness on graphene-terminated 6H-SiC(0001) substrate by molecular beam epitaxy (MBE) method. The growth kinetic processes and crystalline properties of the BiI3 film are studied by scanning tunneling microscopy (STM). The scanning tunneling spectroscopy (STS) reveals a bandgap of 2.8 eV for monolayer BiI3 with a weak dependence on film thickness for few-layer BiI3, which greatly exceeds the previous reported values identified by macroscopic optical measurements. This discrepancy originates from the edge effect of BiI3 that renders the bandgap downshift to 1.5 - 1.6 eV, as identified by the STS curves and the further confirmed by density functional theory (DFT) calculations. Our work provides a method to fabricate high-quality monolayer BiI3 film and resolves its intrinsic bandgap as well as the edge effect on reduction of bandgap, benefitting not only to fundamental researches but also to nanoelectronic and optoelectronic applications.
Ennius and his predessors
Creators: name: Hartley, Vivian Alma
Publisher: name: University of British Columbia
Year: 2010

description: The Annales of the Roman poet, Quintus Ennius, was not an isolated example of an historical epic. Other poets before Ennius' time had written epics of various types, and different sorts of poems that dealt with historical or national material, and some of these influenced Ennius. This study will consider Ennius' relationship to the Homeric epics, and show how he imitated them in form and style. The writings of other Greek poets who preceded Ennius will be examined to determine whether they might also have influenced the Roman poet. The works of the two Roman poets who wrote before Ennius will be looked at, and some observations made about other historical materials that may have been available for the poet to use in his work. Finally, the place of Quintus Ennius and his Annales in the historiography of Rome will be discussed. The Annales seems to have been unique in that it was an epic poem which encompassed the whole history of the Roman people from the earliest times right down to the period in which the poet lived. Other poets before Ennius had dealt with some aspects of their cities' backgrounds, including mythological and legendary material. Ennius was the first to combine ancient legends and more recent history into one coherent epic poem, his Annales.
Die Geschichte der Arbeiter- und Sozialarchive in Frankreich
Creators: name: Dreyfus, Michel
Publisher: name: Moving the Social
Year: 2014

description: This is the contribution "Die Geschichte der Arbeiter- und Sozialarchive in Frankreich" of MTS 14 (1993).
description: Moving the Social, Vol 14 (1993): Forschungen zur Arbeiterschaft und Arbeiterbewegung in Frankreich
"Ein Fanal des Widerstandes im Ruhrgebiet": Das "Unternehmen Wesel" in der Osternacht des Jahres 1923. Hintergründe eines angeblichen "Husarenstreichs"
Creators: name: Krüger, Gerd
Publisher: name: Moving the Social
Year: 2014

description: This is the contribution "'Ein Fanal des Widerstandes im Ruhrgebiet': Das 'Unternehmen Wesel' in der Osternacht des Jahres 1923. Hintergründe eines angeblichen 'Husarenstreichs'" of MTS 24 (2000).
description: Moving the Social, Vol 24 (2000): Forschungen und Forschungsberichte
Control of atomic currents using a quantum stirring device
Creators: name: Hiller, Moritz
name: Kottos, Tsampikos
name: Cohen, Doron
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Other Condensed Matter (cond-mat.other)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a BEC stirring device which can be regarded as the incorporation of a quantum pump into a closed circuit: it produces a DC circulating current in response to a cyclic adiabatic change of two control parameters of an optical trap. We demonstrate the feasibility of this concept and point out that such device can be utilized in order to probe the interatomic interactions.
description: 5 pages, 4 figures, uses epl2.cls, revised version
Multiple measurements of quasars acting as standard probes: model independent calibration and exploring the Dark Energy Equation of States
Creators: name: Zheng, Xiaogang
name: Cao, Shuo
name: Biesiada, Marek
name: Li, Xiaolei
name: Liu, Tonghua
name: Liu, Yuting
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Recently, two classes of quasar samples were identified, which are promising as new cosmological probes extending to higher redshifts. The first sample uses the nonlinear relation between the ultraviolet and X-ray luminosities of quasars to derive luminosity distances, whereas the linear sizes of compact radio quasars in the second sample can serve as standardized rulers, providing angular-diameter distances. In this study, under the assumption of a flat universe, we refreshed the calibration of multiple measurements of high-redshift quasars (in the framework of a cosmological-model-independent method with the newest Hubble parameters data). Furthermore, we placed constraints on four models that characterize the cosmic equation of state ($w$). The obtained results show that: 1) the two quasar samples could provide promising complementary probes at much higher redshifts, whereas compact radio quasars perform better than ultraviolet and X-ray quasars at the current observational level; 2) strong degeneracy between the cosmic equation of state ($w$) and Hubble constant ($H_0$) is revealed, which highlights the importance of independent determination of $H_0$ from time-delay measurements of strongly lensed Quasars; 3)together with other standard ruler probes, such as baryon acoustic oscillation distance measurements, the combined QSO+BAO measurements are consistent with the standard $Λ$CDM model at a constant equation of state $w=-1$; 4) ranking the cosmological models, the polynomial parametrization gives a rather good fit among the four cosmic-equation-of-state models, whereas the Jassal-Bagla-Padmanabhan (JBP) parametrization is substantially penalized by the Akaike Information Criterion and Bayesian Information Criterion criterion.
description: 15 pages, 8 figures, 2 tables, accepted for publication in SCPMA
Le Siècle des Communismes, sous la direction de Michel Dreyfus, Bruno Groppo, Claudio Sergio Ingerflom, Roland Lew, Claude Pennetier, Bernard Pudal, Serge Wolikow, Paris 2000, 542 S.
Creators: name: Malvache, Jean-Luc
Publisher: name: Moving the Social
Year: 2014

description: Le Siede des Communismes, sous la direction de Michel Dreyfus, Bruno Groppo, Claudio Sergio Ingerflom, Roland Lew, Claude Pennetier, Bernard  Pudal, Serge Wolikow, Paris 2000, 542 S.
description: Moving the Social, Vol 26 (2001): Forschungen und Forschungsberichte
Structure and Dynamics of the Sun's Open Magnetic Field
Creators: name: Antiochos, S. K.
name: DeVore, C. R.
name: Karpen, J. T.
name: Mikic, Z.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The solar magnetic field is the primary agent that drives solar activity and couples the Sun to the Heliosphere. Although the details of this coupling depend on the quantitative properties of the field, many important aspects of the corona - solar wind connection can be understood by considering only the general topological properties of those regions on the Sun where the field extends from the photosphere out to interplanetary space, the so-called open field regions that are usually observed as coronal holes. From the simple assumptions that underlie the standard quasi-steady corona-wind theoretical models, and that are likely to hold for the Sun, as well, we derive two conjectures on the possible structure and dynamics of coronal holes: (1) Coronal holes are unique in that every unipolar region on the photosphere can contain at most one coronal hole. (2) Coronal holes of nested polarity regions must themselves be nested. Magnetic reconnection plays the central role in enforcing these constraints on the field topology. From these conjectures we derive additional properties for the topology of open field regions, and propose several observational predictions for both the slowly varying and transient corona/solar wind.
description: 26 pages, 6 figures
Gauge-Higgs Unification from the Heterotic String
Creators: name: Schmidt, Jonas
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present a 6D orbifold model on $T^2/\Z2$ which emerges as intermediate step in the compactification of the heterotic string to the supersymmetric standard model in four dimensions. It has $\SU6$ gauge symmetry in the bulk and two pairs of inequivalent fixed points with unbroken $\SU5$ and $\SU2 \times \SU4$ symmetry, respectively. All anomalies are cancelled by the Green-Schwarz mechanism. Two quark-lepton generations are located at the $\SU5$ branes, the third family is composed of split bulk hypermultiplets. The model has vacua with partial or full gauge-Higgs unification and non-vanishing Yukawa couplings which generically avoid the unsuccessful $\SU5$ mass relations.
description: Talk given at 13th International Symposium on Particles, Strings and Cosmology (PASCOS 07), London, England, 2-7 Jul 2007
Ernst Thälmann: The Making of a German Communist, 1886–1921
Creators: name: LaPorte, Norman
Publisher: name: Moving the Social
Year: 2015

description: During the Cold War Ernst Thälmann was remembered in polar opposite ways in the divided Germany. In the East, he was presented as a paragon of the regime’s official antifascism; in the West, he symbolised Moscow’s domination of German communism and was dismissed as a local politician promoted above and beyond his competences. This article aims to historicise Thälmann by contextualising his political choices, from his early experiences as an unskilled worker in Hamburg’s giant docks in the pre-war workers’ movement, the frontline service in the First World War, participation in the November Revolution and, finally, his path to the KPD via the radical local USPD. In the massbased early KPD, the article identifies Thälmann importance as a leader of a local form of ultra-militant communism and, initially at least, someone who believed his proletarian credential enabled him to challenge even Lenin – who tried to “moderate” party policy at the Third Congress of the Comintern in 1921. If Thälmann ultimately became dependent on Stalin and Moscow, then this appraisal of his early political life shows how important specific local experiences were in shaping his worldview and political actions.
description: Moving the Social, Vol 51 (2014): Lifes on the Left
Avantgarde einer egalitären Bewegung: Anarchosyndikalisten in Deutschland in der ersten Hälfte des 20. Jahrhunderts
Creators: name: Nelles, Dieter
name: Rübner, Hartmut
Publisher: name: Moving the Social
Year: 2015

description: The historic impact of anarcho-syndicalism as an autonomous current within the German workers’ movement lasted approximately 40 years. On a national scale, the Free Workers’ Union of Germany (FAUD), as the most influential organisation of this kind, appears as a marginalised association on the periphery of the labour movement. Only during the years 1919 to 1922/23 the FAUD asserted itself temporarily as an influential factor at shop floor levels in some regions of Germany. Once reaching a membership of more than 120,000 in the first years of the Weimar Republic, its membership substantially declined to only 4,307 in 1932, compared to 3.5 million Social Democrats in the Allgemeiner Deutscher Gewerkschaftsbund. However, a more differentiated picture emerges locally. Anarcho-syndicalists frequently played an important role in the fight against the rise of the Nazi Party as well as in the inter-group culture and the self-help initiatives of the labour movement. Thereby, inter-generational social cohesion was gained not necessarily by acting as a trade union primarily committed to class conflict, but through diverse cultural engagements. In this respect, the formative influence of anarcho-syndicalist culture in everyday life functioned as an integrative agency of socialisation. The quasi-familial group structure at the base included all generations and therefore ensured continuity. In general, the organisation integrated children and attracted young people from socialist family backgrounds. Altogether, the generations possessed or developed long-standing political experiences and identified themselves with a “socialist-libertarian” model of society. This essay deals with this scope of persons, who – to a certain extent – shared the characteristics of an elite without deriving entitlements from it. Based on an approximately 40-year-long organisational history, four generations of actors can be distinguished: 1. socialist pioneers; 2. syndicalist founders; 3. industrial syndicalists; 4. young anarcho-syndicalists.
description: Moving the Social, Vol 51 (2014): Lifes on the Left
Detection of multipartite entanglement via quantum Fisher information
Creators: name: Hong, Yan
name: Qi, Xianfei
name: Gao, Ting
name: Yan, Fengli
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this paper, we focus on two different kinds of multipartite correlation, $k$-nonseparability and $k$-partite entanglement, both of which can describe the essential characteristics of multipartite entanglement. We propose effective methods to detect $k$-nonseparability and $k$-partite entanglement in terms of quantum Fisher information. We illustrate the significance of our results and show that they identify some $k$-nonseparability and $k$-partite entanglement that cannot be identified by known criteria by several concrete examples.
Archivieren und Publizieren quantitativer Daten bei GESIS
Creators: name: Netscher, Sebastian
Publisher: name: Zenodo
Year: 2021
Subjects: data sharing, data ingest, archiving

description: The presentation „Archivieren und Publizieren quantitativer Daten bei GESIS“ was part of the Forschungsfördertag 2021 at the University of Vechta (Germany), held on November, 25th 2021. It examines the archiving process for the GESIS repository SoDaNet|datorium and introduces how data providers can archive their data at GESIS.
Two Modes of Magnetization Switching in a Simulated Iron Nanopillar in an Obliquely Oriented Field
Creators: name: Thompson, S. H.
name: Brown, G.
name: Rikvold, P. A.
name: Novotny, M. A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Finite-temperature micromagnetics simulations are employed to study the magnetization-switching dynamics driven by a field applied at an angle to the long axis of an iron nanopillar. A bi-modal distribution in the switching times is observed, and evidence for two competing modes of magnetization-switching dynamics is presented. For the conditions studied here, temperature $T = 20$ K and the reversal field 3160 Oe at an angle of 75$^\circ$ to the long axis, approximately 70% of the switches involve unstable decay (no free-energy barrier) and 30% involve metastable decay (a free-energy barrier is crossed). The latter are indistinguishable from switches which are constrained to start at a metastable free-energy minimum. Competition between unstable and metastable decay could greatly complicate applications involving magnetization switches near the coercive field.
description: 19 pages, 7 figures
Appendix_Chironi_Portos_EJPG.pdf
Creators: name: Chironi, Daniela
Publisher: name: figshare
Year: 2021
Subjects: subject: Sociology
subject: FOS: Sociology

description: In this appendix we present the full list of the informants we have interviewed for our article "Together we stand": Coalition-building in the Italian and Spanish feminist movements in times of crisis.
Blazar microvariability at hard X-rays
Creators: name: Foschini, L.
name: Gliozzi, M.
name: Pian, E.
name: Tagliaferri, G.
name: Tavecchio, F.
name: Bianchin, V.
name: Maraschi, L.
name: Sambruna, R. M.
name: Di Cocco, G.
name: Ghisellini, G.
name: Malaguti, G.
name: Tosti, G.
name: Treves, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Blazars are known to display strong and erratic variability at almost all the wavelengths of electromagnetic spectrum. Presently, variability studies at high-energies (hard X-rays, gamma-rays) are hampered by low sensitivity of the instruments. Nevertheless, the latest generation of satellites (INTEGRAL, Swift) have given suggestions not yet fully confirmed of variability on intraday timescales. Some specific cases recently observed are presented and physical implications are discussed (e.g. NRAO 530). The contribution that SIMBOL-X could give in this research topic is also outlined.
description: 4 pages, 2 figures. Proceedings of the conference "SIMBOL-X: the hard X-ray Universe in focus", May 14-16, 2007, Bologna (Italy)