cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Engineering Arbitrary Hamiltonians in Phase Space
Creators: name: Guo, Lingzhen
name: Peano, Vittorio
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Applied Physics (physics.app-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We introduce a general method to engineer arbitrary Hamiltonians in the Floquet phase space of a periodically driven oscillator, based on the non-commutative Fourier transformation (NcFT) technique. We establish the relationship between an arbitrary target Floquet Hamiltonian in phase space and the periodic driving potential in real space. We obtain analytical expressions for the driving potentials in real space that can generate novel Hamiltonians in phase space, e.g., rotational lattices and sharp-boundary well. Our protocol can be realised in a range of experimental platforms for nonclassical states generation and bosonic quantum computation.
description: More results and 6 new figures are added in the 2nd version; Figures are updated and typos are corrected in the 3rd version
Interferences between Bogoliubov excitations and their impact on the evidence of superfluidity in a paraxial fluid of light
Creators: name: Fontaine, Quentin
name: Larré, Pierre-Elie
name: Lerario, Giovanni
name: Bienaimé, Tom
name: Pigeon, Simon
name: Faccio, Daniele
name: Carusotto, Iacopo
name: Giacobino, Elisabeth
name: Bramati, Alberto
name: Glorieux, Quentin
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Paraxial fluids of light represent an alternative platform to atomic Bose-Einstein condensates and superfluid liquids for the study of the quantum behaviour of collective excitations. A key step in this direction is the precise characterization of the Bogoliubov dispersion relation, as recently shown in two experiments. However, the predicted interferences between the phonon excitations that would be a clear signature of the collective superfluid behaviour have not been observed to date. Here, by analytically, numerically, and experimentally exploring the phonon phase-velocity, we observe the presence of interferences between counter-propagating Bogoliubov excitations and demonstrate their critical impact on the measurement of the dispersion relation. These results are evidence of a key signature of light superfluidity and provide a novel characterization tool for quantum simulations with photons.
Torus models for obscuration in type 2 AGN
Creators: name: Beckert, Thomas
name: Duschl, Wolfgang J.
name: Vollmer, Bernd
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We discuss a clumpy model of obscuring dusty tori around AGN. Cloud-cloud collisions lead to an effective viscosity and a geometrically thick accretion disk, which has the required properties of a torus. Accretion in the combined gravitational potential of central black hole and stellar cluster generates free energy, which is dissipated in collisions, and maintains the thickness of the torus. A quantitative treatment for the torus in the prototypical Seyfert 2 nucleus of NGC 1068 together with a radiative transfer calculation for NIR re-emission from the torus is presented.
description: 6 pages, 2 figures, contributed paper to Proceedings of the Conference "Growing Black Holes" held in Garching, Germany, June 21-25, 2004, edited by A. Merloni, S. Nayakshin and R. Sunyaev, Springer-Verlag series of "ESO Astrophysics Symposia"
title: 02_1467
Creators: name: Wesley Baldwin, John
name: Baldwin, John W.
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2018
Subjects: subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris

description: L'ensemble de ces notes ont été crée par John Baldwin lors d'une de ses premières périodes de résidence à Paris. Ces documents comprennent tous les magistri qu’il avait pu rencontrer dans ses sources. Aux XIIème et XIIIème siècles, les universités n'existant pas encore, le titre de magister s'il évoque certainement une compétence n'est pas rattaché de façon systématique au passage par les écoles. De surcroît, les magistris sont le plus souvent désignés par leur seul prénom. La lecture de ces données est donc difficile et suppose un long travail pour tenter d'identifier un individu auquel on pourrait rattacher plusieurs mentions. John Baldwin avait donc renoncé à utiliser ces données pour donner un prolongement à sa magnifique étude sur les gradués d'université et leur emploi par les Capétiens et les Plantagenêts. Néanmoins, il a conservé ces données et elles sont potentiellement très utile dans le cadre de Studium, comme le sont toutes les mentions dans les volumes des Fasti Ecclesiae Gallicanae de chanoines portant ce titre de magister sans autres précisions. L'ampleur des dépouillements rend ces données très utiles et nous devons une grande reconnaissance à John Baldwin pour avoir pris la peine de faire photocopier ses fiches et de nous les avoir transmises amicalement.
Les données ainsi que les images des fiches sont accessibles sur le site Internet à l'adresse suivante : http://studium-baldwin.lamop.fr/.
Les transcriptions des fiches ont été effectuées par des étudiants de Paris 1 Panthéon - Sorbonne mais elles n'ont pas été corrigées par la suite.
description: Relation: https://lamop.hypotheses.org/
Planar LAAPDs: Temperature Dependence, Performance, and Application in Low Energy X-ray Spectroscopy
Creators: name: Ludhova, L.
name: Amaro, F. D.
name: Antognini, A.
name: Biraben, F.
name: Cardoso, J. M. R.
name: Conde, C. A. N.
name: Covita, D. S.
name: Dax, A.
name: Dhawan, S.
name: Fernandes, L. M. P.
name: Hansch, T. W.
name: Hughes, V. W.
name: Huot, O.
name: Indelicato, P.
name: Julien, L.
name: Knowles, P. E.
name: Kottmann, F.
name: Lopes, J. A. M.
name: Liu, Y. -W.
name: Monteiro, C. M. B.
name: Mulhauser, F.
name: Nez, F.
name: Pohl, R.
name: Rabinowitz, P.
name: Santos, J. M. F. dos
name: Schaller, L. A.
name: Taqqu, D.
name: Veloso, J. F. C. A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: An experiment measuring the 2S Lamb shift in muonic hydrogen mup is being performed at the Paul Scherrer Institute, Switzerland. It requires small and compact detectors for 1.9 keV x rays (2P-1S transition) with an energy resolution around 25% at 2 keV, a time resolution better than 100 ns, a large solid angle coverage, and insensitivity to a 5 T magnetic field. We have chosen Large Area Avalanche Photodiodes (LAAPDs) from Radiation Monitoring Devices as x-ray detectors, and they were used during the last data taking period in 2003. For x-ray spectroscopy applications, these LAAPDs have to be cooled in order to suppress the dark current noise, hence, a series of tests were performed to choose the optimal operation temperature. Specifically, the temperature dependence of gain, energy resolution, dark current, excess noise factor, and detector response linearity was studied. Finally, details of the LAAPDs application in the muonic hydrogen experiment as well as their response to alpha particles are presented.
description: 20 pages, 19 figures, submitted to Nucl. Instr. and Methods A
APHP - Eve Aulong
Creators: name: Leibowitch, Jacques (1942-2020)
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2020

description: 1 fichier (5 pages). Autre destinataire : Florence Ghrenassia.
Components Selection of ISRASAT Series Ground Station
Creators: name: Romisaa Ali Mouhamed
Publisher: name: figshare
Year: 2020
Subjects: subject: 90699 Electrical and Electronic Engineering not elsewhere classified
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In satellite communication, small ground stations are designed to operate in communication with small cubic satellites orbiting in low Earth orbits (LEO), the altitude start from 320 km to 1100 km above the earth. This paper aims to develop and support research projects at the Institute of Space Research and Aerospace (ISRA). It is utilized to track and receive data from ISRASAT1 satellite, being developed at ISRA. After surveying a number of ground stations in a number of universities, the components of the ground station were chosen to obtain a ground station that receives and sends signals via the satellite, taking into account the selection of components at the lowest possible cost without affecting the quality of communication. The ground station consists of the antenna system including rotor interface, transceiver and terminal node controller (TNC), modem and the processing system [1].
Coloured s-wave quark clusters with flavour symmetry breaking
Creators: name: Hogaasen, H.
name: Sorba, P.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the properties of coloured three particle s-wave quark clusters when flavour symmetry is broken. The relevance of such clusters for models of pentaquarks is shortly mentioned.
Deciphering the 3-D Orion Nebula-I: Expanding Shells in the Huygens Region
Creators: name: O'Dell, C. R.
name: Abel, N. P.
name: Ferland, G. J.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Based on imaging and spectroscopic data, we develop a 3-D model for the Huygens Region of the Orion Nebula. Theta1OriC , the hottest star in the Trapezium, is surrounded by a wind-blown Central Bubble that opens SW into the Extended Orion Nebula. Outside of this feature lies a layer of ionized gas at about 0.4 pc from Theta1OriC. Both of these features are moving rapidly away from Theta1OriC with an expansion age for the Central Bubble of only 15,000 yrs.
Localization of electronic states by fullerene charges in carbon nanotubes
Creators: name: Gonzalez, J.
name: Guinea, F.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the effects of the electrostatic interaction produced by charged fullerenes encapsulated in carbon nanotubes, showing that they are able to modify locally the electronic density of states in the hybrid system. In the cases where the interaction is felt as an attractive potential by the electrons in the nanotube, localized electronic states are formed in the nanotubes around the position of the fullerenes. This produces an effective narrowing of the gap in semiconducting nanotubes over a distance of a few nanometers, in agreement with the spatial modulation of the gap observed in the experiments.
description: 5 pages
Transferability of self-energy correction in tight-binding basis constructed from first principles
Creators: name: Hossain, Manoar
name: Bhattacharjee, Joydeep
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We demonstrate in this work the transferability of self-energy(SE) correction(SEC) of Kohn-Sham(KS) single particle states from smaller to larger systems, when mapped through localized orbitals constructed from the KS states. The approach results in a SE corrected TB framework, within which, the mapping of SEC of TB parameters is found to be transferable from smaller to larger systems of similar morphology, leading to a computationally inexpensive approach for estimation of SEC in large systems with reasonably high accuracy. The scheme has been demonstrated in insulating, semiconducting and magnetic nanoribbons of graphene and hexagonal boron nitride, where SEC tends to strengthen the individual pi bonds, leading to transfer of charge from edge to bulk. Additionally in magnetic bipartite systems SEC tends to enhance inter-sublattice spin separation. The proposed scheme thus promises to enable estimation of SEC of band-gaps of large systems without needing to explicitly calculate SEC of KS single particle levels which can be computationally prohibitively expensive.
description: 7 pages, 5 figures
A Large-Scale Analysis of Persian Tweets Regarding Covid-19 Vaccination
Creators: name: ShabaniMirzaei, Taha
name: Chamani, Houmaan
name: Abaskohi, Amirhossein
name: Zadeh, Zhivar Sourati Hassan
name: Bahrak, Behnam
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computation and Language (cs.CL)
subject: Social and Information Networks (cs.SI)
subject: FOS: Computer and information sciences
subject: I.2.7

description: The Covid-19 pandemic had an enormous effect on our lives, especially on people's interactions. By introducing Covid-19 vaccines, both positive and negative opinions were raised over the subject of taking vaccines or not. In this paper, using data gathered from Twitter, including tweets and user profiles, we offer a comprehensive analysis of public opinion in Iran about the Coronavirus vaccines. For this purpose, we applied a search query technique combined with a topic modeling approach to extract vaccine-related tweets. We utilized transformer-based models to classify the content of the tweets and extract themes revolving around vaccination. We also conducted an emotion analysis to evaluate the public happiness and anger around this topic. Our results demonstrate that Covid-19 vaccination has attracted considerable attention from different angles, such as governmental issues, safety or hesitancy, and side effects. Moreover, Coronavirus-relevant phenomena like public vaccination and the rate of infection deeply impacted public emotional status and users' interactions.
description: 10 figures
Hydrogen generation from aluminum-water systems
Creators: name: Czech, Edith Barbara
Publisher: name: University of British Columbia
Year: 2010

description: Aluminum is one of the most active metals with high affinity to oxygen. In reality however, its reactivity is drastically reduced by the presence of a nanometer-thin oxide film which prevents (or slows down) its corrosion in environments in which the pH ranges from about 4 to 9. Increased reactivity and uniform corrosion is observed typically only in high alkaline or high acidic solutions in which the film dissolves. It has been recently discovered at UBC that the passivation of aluminum in aqueous solutions of neutral and near-neutral pH can be prevented when Al is mechanically alloyed with a non-metallic second phase, such as alumina, carbon or metal oxides [1, 2]. In this work another variant of this system, the Al-WIS (Water-soluble Inorganic Salts such as KC1 or NaCl) system, is introduced. The rapid and massive corrosion reaction of the mechanically alloyed Al-WIS system, which takes place in tap (or marine, or ground) water, releases remarkably high amounts of hydrogen gas. This system can therefore be utilized as in situ, on demand hydrogen generation method through aluminum-assisted water split reaction. Al-WIS powders were prepared by high-energy ball-milling. Powder mixtures as well as salt-free (leached-out) Al powders were characterized using SEM, EDS, XRD, XPS and BET methods. Reaction enthalpy was determined using DSC and the pH shift during the reaction was monitored with a pH meter. The effects of WIS concentration, chemistry of other additives, powder particle size, temperature, and milling conditions on the reaction kinetics were investigated. The H₂ yield and Al- WIS reaction efficiency were high. From 1 g of mechanically alloyed Al powder, up to 1.25 litres of hydrogen gas were generated in the first hour of the reaction, i.e. efficiency up to 92% was achieved. Besides pure gaseous hydrogen, only pure solid aluminum hydroxides were formed as the reaction products. Bayerite (Al(OH)₃) was predominantly formed at T < 60°C whereas boehmite (AIOOH) at T > 100°C. Both phases were present in the temperature range between 60°C < T < 100°C.
Identification of Immune-Related Gene Pair Signature to Predict Prognosis of Diffuse Large B-Cell Lymphoma Based on Bioinformatics Analyses
Creators: name: Davoodi-Moghaddam, Zeinab
name: Jafari-Raddani, Farideh
name: Bashash, Davood
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Biophysics
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Cell Biology
subject: Genetics
subject: Molecular Biology
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Cancer
subject: Mental Health
subject: Hematology
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Virology

description: Since over one-third of DLBCL patients experience relapse or refractory after standard therapy, high-risk patients must be predicted. We developed a prognostic immune-related gene pairs (IRGPs) signature for DLBCL patients using bioinformatics analyses. This signature can predict the prognosis of these patients adequately, either alone or in combination with other clinical parameters. It hopes to improve the stratification and management of these patients for broad clinical applications.
Angle-Resolved Photoemission Spectroscopy of the Antiferromagnetic Superconductor Nd1.87Ce0.13CuO4: Anisotropic Spin-Correlation Gap, Pseudogap, and the Induced Quasiparticle Mass Enhancement
Creators: name: Matsui, H.
name: Terashima, K.
name: Sato, T.
name: Takahashi, T.
name: Wang, S. -C.
name: Yang, H. -B.
name: Ding, H.
name: Uefuji, T.
name: Yamada, K.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We performed high-resolution angle-resolved photoemission spectroscopy on Nd1.87Ce0.13CuO4, which is located at the boundary of the antiferromagnetic (AF) and the superconducting phase. We observed that the quasiparticle (QP) effective mass around (pi, 0) is strongly enhanced due to the opening of the AF gap. The QP mass and the AF gap are found to be anisotropic, with the largest value near the intersecting point of the Fermi surface and the AF zone boundary. In addition, we observed that the QP peak disappears around the Neel temperature (TN) while the AF pseudogap is gradually filled up at much higher temperatures, possibly due to the short-range AF correlation.
description: 4 pages, 4 figures
IDENTIFICACIÓN DE LAS CAUSAS DETERMINANTES DE LA FORMACIÓN DEL CLÚSTER DE LA AGROINDUSTRIA DEL JITOMATE: PROPUESTA DE UN INSTRUMENTO DE MEDICIÓN
Creators: name: Velazquez Ochoa, Marcos Aurelio
name: Maldonado Radillo, Sonia Elizabeth
name: Rodriguez Rubio, Carlos
name: Velazquez Ochoa, Marcos Aurelio
name: Maldonado Radillo, Sonia Elizabeth
name: Rodriguez Rubio, Carlos
Publisher: name: Unknown
Year: 2012
Subjects: subject: Agribusiness
subject: Agroindustry
subject: Products
subject: Truck farm
subject: Tomato
subject: Agrofood Chain
subject: Cluster.

description: This research develops and validates a specific instrument to assess the cluster formation of tomatoes agro industry. The scale was applied to tomatoes producer. A self-administered instrument was designed to measure the cluster formation of agro industry. It was submitted for review by a multidisciplinary group of experts who assessed its logical and content validity. We determined to construct validity using factor analysis with main components and Varimax rotation. The eigenvalues were above 1 and factor loadings, above 0.50. Thirty four items were eliminated from the analysis because they showed a low correlation with the total correlation of the scale. The initial main-components analysis revealed thirteen (13) factors with an explained variation of 85.134%. However, six factors were not taken into account, because they had only one item or items significant loads in several domains in factorial analysis. Consequently, final scale was accepted with 52 items. The global rating of the questionnaire had a Cronbach's alpha of 0.888. The article offers a methodological approach to exploring how this instrument might be adapted for use with populations other than the one for which it was designed. The scale has good inner validity and consistency as an incipient construct.
Selection and Configuration ISRAHAB1 Sensors
Creators: name: Romisaa Ali Mouhamed
Publisher: name: figshare
Year: 2020
Subjects: subject: 90699 Electrical and Electronic Engineering not elsewhere classified
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper explains the selection and configurations of the payload sensors for the high altitude balloon project in ISRA Institute; the scope of this paper is process and analysis weather data via Arduino Mega 2560 and calculates the values of measured data to collect atmospheric measurements for sending it to ISRA ground station Located at the Institute site. The objective is analysis data via a microcontroller, after the selection process which was done based on choose sensors which give a required reading and achieved many critical parameters such as low operation temperature, lightweight (these are the most important factors for selection in space applications), suitable price and availability in the market. Then the MPL3115A2 as a pressure sensor, LM35 as a temperature sensor and DHT11 as humidity sensor were chosen to implement ISRA HAB payload to launch up 59-124ft K meter above sea level next month.
On Solving SAR Imaging Inverse Problems Using Non-Convex Regularization with a Cauchy-based Penalty
Creators: name: Karakuş, Oktay
name: Achim, Alin
Publisher: name: arXiv
Year: 2020
Subjects: subject: Signal Processing (eess.SP)
subject: Image and Video Processing (eess.IV)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Synthetic aperture radar (SAR) imagery can provide useful information in a multitude of applications, including climate change, environmental monitoring, meteorology, high dimensional mapping, ship monitoring, or planetary exploration. In this paper, we investigate solutions to a number of inverse problems encountered in SAR imaging. We propose a convex proximal splitting method for the optimization of a cost function that includes a non-convex Cauchy-based penalty. The convergence of the overall cost function optimization is ensured through careful selection of model parameters within a forward-backward (FB) algorithm. The performance of the proposed penalty function is evaluated by solving three standard SAR imaging inverse problems, including super-resolution, image formation, and despeckling, as well as ship wake detection for maritime applications. The proposed method is compared to several methods employing classical penalty functions such as total variation ($TV$) and $L_1$ norms, and to the generalized minimax-concave (GMC) penalty. We show that the proposed Cauchy-based penalty function leads to better image reconstruction results when compared to the reference penalty functions for all SAR imaging inverse problems in this paper.
description: 18 pages, 7 figures
Fermionic atoms in a 3D optical lattice: Observing Fermi-surfaces, dynamics and interactions
Creators: name: Köhl, Michael
name: Moritz, Henning
name: Stöferle, Thilo
name: Günter, Kenneth
name: Esslinger, Tilman
Publisher: name: arXiv
Year: 2004
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We have studied interacting and non-interacting quantum degenerate Fermi gases in a three-dimensional optical lattice. We directly image the Fermi surface of the atoms in the lattice by turning off the optical lattice adiabatically. Due to the confining potential gradual filling of the lattice transforms the system from a normal state into a band insulator which constitutes a high fidelity quantum register. The dynamics of the transition from a band insulator to a normal state is studied and the time scale is measured to be an order of magnitude larger than the tunneling time in the lattice. Using a Feshbach resonance we increase the interaction between atoms in two different spin states and dynamically induce a coupling between the lowest energy bands. We observe a shift of this coupling with respect to the Feshbach resonance in free space which is anticipated for strongly confined atoms.
description: 5 pages, 4 figs
Probing Disordered Substrates by Imaging the Adsorbate in its Fluid Phase
Creators: name: Sengupta, Ankush
name: Sengupta, Surajit
name: Menon, Gautam I.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Several recent imaging experiments access the equilibrium density profiles of interacting particles confined to a two-dimensional substrate. When these particles are in a fluid phase, we show that such data yields precise information regarding substrate disorder as reflected in one-point functions and two-point correlations of the fluid. Using Monte Carlo simulations and replica generalizations of liquid state theories, we extract unusual two-point correlations of time-averaged density inhomogeneities induced by disorder. Distribution functions such as these have not hitherto been measured but should be experimentally accessible.
description: 10 pages revtex 4 figures
ANÁLISIS SOBRE LA NO LINEALIDAD DEL RENDIMIENTO DIARIO DEL PRECIO INTERNACIONAL DEL CAFÉ
Creators: name: Coronado Ramirez, Semei L.
name: Ramirez Grajeda, Mauricio
name: Celso Arellano, Pedro Luis
name: Coronado Ramirez, Semei L.
name: Ramirez Grajeda, Mauricio
name: Celso Arellano, Pedro Luis
Publisher: name: Unknown
Year: 2012
Subjects: subject: Agribusiness
subject: Hinich portmanteau
subject: Bicorrelation
subject: Tricorrelation.

description: This article applies the Hinich portmanteau test to the daily return of the international Arabica Colombian coffee price the period 06/29/1990 to 07/01/2010. By splitting the data in windows and setting the null hypothesis on the time series, H : a stationary pure noise process with zero 0 tricorrelations and bicorrelations for each window. The main result of this paper is that there is significant evidence in 10 and 11 windows, respectively. This shows that there are statistical structures with nonlinear dependence. Thus it is difficult for economic agents to cope with forecast performance decisions in this market.
Modeling CHANDRA Low Energy Transmission Grating Spectrometer Observations of Classical Novae with PHOENIX. I. V4743 Sagittarii
Creators: name: Petz, Alexander
name: Hauschildt, Peter H.
name: Ness, Jan-Uwe
name: Starrfield, Sumner
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We use the PHOENIX code package to model the X-ray spectrum of Nova V4743 Sagittarii observed with the LETGS onboard the Chandra satellite on March 2003. Our atmosphere models are 1D spherical, expanding, line blanketed, and in full NLTE. To analyze nova atmospheres and related systems with an underlying nuclear burning envelope at X-ray wavelengths, it was necessary to update the code with new microphysics, as discussed in this paper. We demonstrate that the X-ray emission is dominated by thermal bremsstrahlung and that the hard X-rays are dominated by Fe and N absorption. The best fit to the observation is provided at a temperature of T_eff = 5.8 x 10^5 K, with L_bol = 50 000 L_sun. The models are calculated for solar abundances. It is shown that the models can be used to determine abundances in the nova ejecta.
description: 8 pages, 6 figures, accepted for publication in Astronomy & Astrophysics
Projection-based two-sample inference for sparsely observed multivariate functional data
Creators: name: Koner, Salil
name: Luo, Sheng
Publisher: name: arXiv
Year: 2023
Subjects: subject: Methodology (stat.ME)
subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: Modern longitudinal studies collect multiple outcomes as the primary endpoints to understand the complex dynamics of the diseases. Oftentimes, especially in clinical trials, the joint variations among the multidimensional responses play a significant role in assessing the differential characteristics between two or more groups, rather than drawing inferences based on a single outcome. Enclosing the longitudinal design under the umbrella of sparsely observed functional data, we develop a projection-based two-sample significance test to identify the difference between the typical multivariate profiles. The methodology is built upon widely adopted multivariate functional principal component analysis to reduce the dimension of the infinite-dimensional multi-modal functions while preserving the dynamic correlation between the components. The test is applicable to a wide class of (non-stationary) covariance structures of the response, and it detects a significant group difference based on a single p-value, thereby overcoming the issue of adjusting for multiple p-values that arises due to comparing the means in each of components separately. Finite-sample numerical studies demonstrate that the test maintains the type-I error, and is powerful to detect significant group differences, compared to the state-of-the-art testing procedures. The test is carried out on the longitudinally designed TOMMORROW study of individuals at high risk of mild cognitive impairment due to Alzheimer's disease to detect differences in the cognitive test scores between the pioglitazone and the placebo groups.
description: 21 pages, 5 tables, 4 figures
The performance of phaseless auxiliary-field quantum Monte Carlo on the ground state electronic energy of benzene
Creators: name: Lee, Joonho
name: Malone, Fionn D.
name: Reichman, David R.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The ground state electronic energy of benzene is the focus of a recent blind test by Eriksen and co-workers [arXiv:2008.02678]. In this note, we report the phaseless auxiliary-field quantum Monte Carlo (ph-AFQMC) results on the identical problem. We examine trial wavefunctions of the spin-restricted Hartree-Fock (RHF), and complete active space self-consistent field (CASSCF) with an active space of 6-electron and 6-orbital (i.e., CAS(6,6)) form for the cc-pVDZ basis set. ph-AFQMC+RHF deviates from the value where many methods agreed on (i.e., -863 m$E_h$) by -3.1(3) m$E_h$ whereas ph-AFQMC+CAS(6,6) deviates from the same value by -1.3(4) m$E_h$. In addition to this, we report the frozen core correlation energy of ph-AFQMC+RHF in the cc-pVTZ and cc-pVQZ basis sets as well as their complete basis set limit. Our findings highlight the accuracy, flexibility, and scalability of ph-AFQMC with simple trial wavefunctions.
title: Microfluidic chip for rapid calcium determination in human milk
Creators: name: Managhebaty, Mohammad Amin
Publisher: name: TU Wien
Year: 2017
Subjects: subject: Microfluidics
subject: calcium detection

description: Current methods for determination of calcium content in human milk are based on standard laboratory experiments, which are time consuming and require specially trained personnel. Available instruments to accomplish these experiments are usually designed for a sample volume in the range of several milliliters. These approaches are not applicable for in-situ determination of calcium. In this thesis, an inexpensive and rapid technique for quantification of calcium in human milk is presented, using only 5 μL of sample fluid for operation and determining results within 2-3 minutes. Principles of colorimetric chemical analytical methods are miniaturized to fit a specific microfluidic chip, fabricated based on standard dry film photoresist technology. Downscaling challenges such as fluid flow and mixing, are brought under control after implementation of phaseguides in the chip design and utilizing hydrogel concept, respectively. Future steps can be taken toward developing a compact device to replace the spectrometric instruments, making it an ideal analytical device for non-laboratory environments. This method can also be generalized as a new comprehensive technique for colorimetric assays in micrometer scale for other chemical substances.
Towards a Field-Theory based Relativistic Quantum Information
Creators: name: Anastopoulos, Charis
name: Hu, Bei-Lok
name: Savvidou, Konstantina
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present our program for the development of quantum informational concepts in relativistic systems in terms of the unequal-time correlation functions of quantum fields. We employ two formalisms that provide the basis for further developments. (i) The Quantum Temporal Probabilities (QTP) Method for quantum field measurements and (ii) the Closed- Time-Path (CTP) formalism for causal time evolutions. We present the main ideas of QTP and show how it relates to the CTP formalism, allowing one to express concepts of measurement theory in terms of path-integrals. We also present many links of our program to non-equilibrium quantum field theories. Details can be found in a recent paper by the authors (arxiv:2208.03696).
description: 17 pages, Invited talk contribution to DICE 2022, https://osiris.df.unipi.it/~elze/DICE2020.html, based on arXiv:2208.03696
title: 01_2864
Creators: name: Wesley Baldwin, John
name: Baldwin, John W.
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2018
Subjects: subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris

description: L'ensemble de ces notes ont été crée par John Baldwin lors d'une de ses premières périodes de résidence à Paris. Ces documents comprennent tous les magistri qu’il avait pu rencontrer dans ses sources. Aux XIIème et XIIIème siècles, les universités n'existant pas encore, le titre de magister s'il évoque certainement une compétence n'est pas rattaché de façon systématique au passage par les écoles. De surcroît, les magistris sont le plus souvent désignés par leur seul prénom. La lecture de ces données est donc difficile et suppose un long travail pour tenter d'identifier un individu auquel on pourrait rattacher plusieurs mentions. John Baldwin avait donc renoncé à utiliser ces données pour donner un prolongement à sa magnifique étude sur les gradués d'université et leur emploi par les Capétiens et les Plantagenêts. Néanmoins, il a conservé ces données et elles sont potentiellement très utile dans le cadre de Studium, comme le sont toutes les mentions dans les volumes des Fasti Ecclesiae Gallicanae de chanoines portant ce titre de magister sans autres précisions. L'ampleur des dépouillements rend ces données très utiles et nous devons une grande reconnaissance à John Baldwin pour avoir pris la peine de faire photocopier ses fiches et de nous les avoir transmises amicalement.
Les données ainsi que les images des fiches sont accessibles sur le site Internet à l'adresse suivante : http://studium-baldwin.lamop.fr/.
Les transcriptions des fiches ont été effectuées par des étudiants de Paris 1 Panthéon - Sorbonne mais elles n'ont pas été corrigées par la suite.
description: Relation: https://lamop.hypotheses.org/
Thermodynamics of spherically symmetric thin-shell spacetimes
Creators: name: Kotopoulis, Demetrios
name: Anastopoulos, Charis
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We analyze the thermodynamics of spherically symmetric thin-shell solutions to Einstein's equations, including solutions with negative interior mass. We show the inclusion of such solutions is essential for the thermodynamic consistency of the system: the Maximum Energy Principle applies when we include an entropy term from the singularity of the negative-mass solutions, in addition to the Bekenstein-Hawking term for the entropy of solutions with positive interior mass. Then, the thermodynamic analysis leads to four distinct thermodynamic phases. We also show that all types of solutions can be either thermodynamically stable or dynamically stable, but only solutions with zero interior mass can be both. Since most of our results are analytic, thin shell models emerge as a useful theoretical paradigm for exploring gravitational thermodynamics. Our results provide an additional argument in support of the assignment of entropy to the singularity of negative-mass Schwarzschild spacetimes, and, consequently, to Penrose's conjecture about the assignment of entropy to singularities.
description: 20 pages, 9 figures
Super Yang-Mills, Matrix Models and Geometric Transitions
Creators: name: Ferrari, Frank
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: I explain two applications of the relationship between four dimensional N=1 supersymmetric gauge theories, zero dimensional gauged matrix models, and geometric transitions in string theory. The first is related to the spectrum of BPS domain walls or BPS branes. It is shown that one can smoothly interpolate between a D-brane state, whose weak coupling tension scales as Nc or 1/gs, and a closed string solitonic state, whose weak coupling tension scales as Nc^2 or 1/gs^2. This is part of a larger theory of N=1 quantum parameter spaces. The second is a new purely geometric approach to sum exactly over planar diagrams in zero dimension. It is an example of open/closed string duality.
description: 11 pages, 2 figures, .cls files included; to appear in the proceedings of the Strings 2004 conference in Paris
Understanding the Linkage among Public Procurement (PP), Corruption, and Tax Morale (TM) Through Agency Theory (AT): A Review
Creators: name: Siddiqui, Zeeshan Noor
Publisher: name: figshare
Year: 2020
Subjects: subject: Sociology
subject: FOS: Sociology
subject: 140215 Public Economics- Taxation and Revenue
subject: FOS: Economics and business
subject: 140213 Public Economics- Public Choice
subject: 140207 Financial Economics
subject: Economics
subject: 150303 Corporate Governance and Stakeholder Engagement
subject: 150309 Logistics and Supply Chain Management

description: This paper aims to develop an inter-disciplinary conceptual framework through review of literature on the relationship among corruption, corruption in public procurement (CiPP), and effects of CiPP on the tax morale (TM). As proposed by Bernheim and Whinston (1986), the ‘Agency theory’ (AT) is applied to view and explain the occurrence of multiple agency problem(s) in PP arising due to high stakes of divergent stakeholders such as: (1) electorate (the public), (2) political elite (elected representative(s), chief executive(s), and cabinet minister(s) etc.), (3) influence group(s), and (4) PP professionals (PPP). Potential of PP to act as a potent tool of public-policy-implementation is suggested by scholars if transparency in PP is ensured. Effect of inefficiencies in governance on the taxpayers’ TM is highlighted in the literature however, CiPP is presented as an inefficiency in judicious utilization of public money. Corruption-free PP will not only help the governments to ‘do more with less’ by eliminating inefficiencies (CiPP) but establish the moral authority of governments (especially in developing countries) to raise TM of taxpayers for raising tax collection and channelizing taxpayers’ money for improving socioeconomic indicators in the developing economies. Two main types of corruption (grand, and legislative) are in the scholastic focus from different subjects however, petty corruption (here CiPP) is not much focused in the studies conducted so far.
Construction and Validation of a Novel T/NK-Cell Prognostic Signature for Pancreatic Cancer Based on Single-Cell RNA Sequencing
Creators: name: Wang, Yu
name: Zhang, Cong
name: Zhang, Jianlu
name: Huang, Haoran
name: Guo, Junchao
Publisher: name: Taylor & Francis
Year: 2025
Subjects: subject: Genetics
subject: FOS: Biological sciences
subject: Physiology
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified
subject: Information Systems not elsewhere classified
subject: Cancer

description: Evidence with regards to the distinction between primary and metastatic tumors in pancreatic cancer and driving factors for metastases remains limited. A single-cell RNA sequencing (scRNA-seq) dataset on metastatic pancreatic cancer, GSE197177, was obtained from the Gene Expression Omnibus (GEO) database. Bioinformatics analysis on relevant sequencing data was used to construct a risk model to predict patient prognosis. Furthermore, immune infiltration and metabolic differences were assessed. The biological function of key differential genes was evaluated. The scRNA-seq dataset included three primary untreated pancreatic ductal adenocarcinoma tumors, four hepatic metastases, and one adjacent normal tissue. Subsequently, the T/NK cell subgroup was the most different cell type between cancerous tissues and control group (normal tissue), which also increased in both proportion and number from primary to metastatic lesions, and was selected for further analysis. Eventually, 4 specifically expressed genes of T/NK cells (DGKZ, KIF20B, RARRES3, RHOF) were used constructing the prognostic model. The stability of this model was validated by an external cohort. Meanwhile, different immune infiltration abundances occurred between high and low risk groups stratified by the model. The low-risk group had a stronger metabolic capability. A novel prognostic T/NK-cell signature for pancreatic cancer was constructed based on scRNA-seq data and externally validated. The involved key genes may play a role in multiple metabolic pathways of metastasis and affect the tumor immune microenvironment.
Ultra-bright single photon source based on an atomically thin material
Creators: name: Drawer, Jens-Christian
name: Mitryakhin, Victor Nikolaevich
name: Shan, Hangyong
name: Stephan, Sven
name: Gittinger, Moritz
name: Lackner, Lukas
name: Han, Bo
name: Leibeling, Gilbert
name: Eilenberger, Falk
name: Banerjee, Rounak
name: Tongay, Sefaattin
name: Watanabe, Kenji
name: Taniguchi, Takashi
name: Lienau, Christoph
name: Silies, Martin
name: Anton-Solanas, Carlos
name: Esmann, Martin
name: Schneider, Christian
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Solid-state single photon sources are central building blocks in quantum communication networks and on-chip quantum information processing. Atomically thin crystals were established as possible candidates to emit non-classical states of light, however, the performance of monolayer-based single photon sources has so far been lacking behind state-of-the-art devices based on volume crystals. Here, we implement a single photon source based on an atomically thin sheet of WSe2 coupled to a spectrally tunable optical cavity. It is characterized by a high single photon purity with a $g^{(2)}(0)$ value as low as $4.7 \pm 0.7 \%$ and a record-high first lens brightness of linearly polarized photons as large as $65 \pm 4 \%$. Interestingly, the high performance of our devices allows us to observe genuine quantum interference phenomena in a Hong-Ou-Mandel experiment. Our results demonstrate that open cavities and two-dimensional materials constitute an excellent platform for ultra-bright quantum light sources: the unique properties of such two-dimensional materials and the versatility of open cavities open an inspiring avenue for novel quantum optoelectronic devices.
description: 12 pages, 7 figures
Microwave and spin transfer torque driven coherent control in ferromagnets
Creators: name: Brik, Marina
name: Bernstein, Nirel
name: Capua, Amir
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Coherent control is a method used to manipulate the state of matter using oscillatory electromagnetic radiation which relies on the non-adiabatic interaction. It is commonly applied in quantum processing applications. This technique is interesting in the context of ferromagnetic materials because of the ability to combine it with spintronics for the purpose of fundamental spin transport research, low-power information processing, and potentially future quantum bit (Qubit) applications. In this work we address the theoretical grounds of coherent manipulation in practical ferromagnetic systems. We study electromagnetic radiation driven interaction that is enhanced in the presence of spin polarized currents and map the conditions that allow coherent manipulation for which Rabi oscillations take place. The role of the magnetic anisotropy field is shown to act as an additional oscillatory driving field. We discuss the Gilbert losses in the context of effective coherence decay rates and show that it is possible to control these rates by application of a static spin current. The case of coherent manipulation using oscillatory spin currents that is free of radiation is discussed as well. Our work paves the way towards spin current amplification as well as radiation-free coherent control schemes that may potentially lead to novel Qubits that are robust and scalable.
Stellar Mass Spectra from Non-Isothermal Gravoturbulent Fragmentation
Creators: name: Klessen, R. S.
name: Jappsen, A. -K.
name: Larson, R. B.
name: Li, Y.
name: Mac Low, M. -M.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: (abridged version) Identifying the processes that determine the initial mass function of stars (IMF) is a fundamental problem in star formation theory. One of the major uncertainties is the exact chemical state of the star forming gas and its influence on the dynamical evolution. Most simulations of star forming clusters use an isothermal equation of state (EOS). We address these issues and study the effect of a piecewise polytropic EOS on the formation of stellar clusters in turbulent, self-gravitating molecular clouds. We increase the polytropic exponent gamma from 0.7 to 1.1 at some chosen density n_c, which we vary from from 4.3x10^4 cm^-3 to 4.3x10^7 cm^-3. The change of thermodynamic state at n_c selects a characteristic mass scale for fragmentation M_ch, which we relate to the peak of the observed IMF. We find a relation M_ch ~ n_c^-0.5, supporting the idea that the distribution of stellar masses largely depends on the thermodynamic state of the star-forming gas.
description: 7 pages, including 2 figures: invited talk presented at the conference on "IMF@50: The Stellar Initial Mass Function Fifty Years Later" held at Abbazia di Spineto, Siena, Italy, May 2004; to be published by Kluwer Academic Publishers, edited by E. Corbelli, F. Palla, and H. Zinnecker