cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Extended Kohler's Rule of Magnetoresistance in TaCo$_2$Te$_2$
Creators: name: Pate, Samuel
name: Chen, Bowen
name: Shen, Bing
name: Li, Kezhen
name: Zhou, Xiuquan
name: Chung, Duck Young
name: Divan, Ralu
name: Kanatzidis, Mercouri G.
name: Welp, Ulrich
name: Kwok, Wai-Kwong
name: Xiao, Zhi-Li
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: TaCo$_2$Te$_2$ is recently reported to be an air-stable, high mobility Van der Waals material with probable magnetic order. Here we investigate the scaling behavior of its magnetoresistance. We measured both the longitudinal ($ρ_{xx}$) and Hall ($ρ_{xy}$) magnetoresistivities of TaCo$_2$Te$_2$ crystals in magnetic fields parallel to the c-axis and found that the magnetoresistance violates the Kohler's rule $MR \sim f[H/ρ_0]$ while obeying the extended Kohler's rule $MR \sim f[H/(n_Tρ_0)]$, where $MR \sim [ρ_{xx}(H)-ρ_0]/ρ_0$, $H$ is the magnetic field, $n_T$ is a thermal factor, $ρ_{xx}(H)$ and $ρ_0$ are the resistivities at $H$ and zero field, respectively. While deviating from those of the densities of electrons ($n_e$) and holes ($n_h$) obtained from the two-band model analysis of the magnetoconductivities, the temperature dependence of $n_T$ is close to that of the Hall carrier densities $n_H$ calculated from the slopes of $ρ_{xy}(H)$ curves at low magnetic fields, providing a new way to obtain the thermal factor in the extended Kohler's rule.
In vivo measurement of the hypoxia marker EF5 using ¹⁹F magnetic resonance spectroscopy
Creators: name: Hoff, Michael Nicholas
Publisher: name: University of British Columbia
Year: 2010

description: ¹⁹FMagnetic Resonance Spectroscopy (MRS) of the 2-nitroimidazole EF5 [2-(2-nitro-1Himidazol-1-y1)-N-(2,2,3,3,3-pentafluoropropyl) acetamide] injected intravenously (IV) into DDS mice with implanted Shionogi prostate tumours produced a negative correlation in two of three sample groups when MRS signal was compared with hypoxic fraction determined by flow cytometry. The negative correlations in mouse groups a and b generated P values via regression analysis of 0.006 and 0.073 respectively. The viability of cells in group a was 34 °± 26 %, whereas group b and c had a combined viability of 7.2 ± 5.8%. No signal resulted from scans of disaggregated or enzymatically digested tumour cells. Measurements of MRS signal over time yielded a steady decline of detectable signal to at least 7 hours after intraperitoneal (IP) injection of EF5 in all mice; one mouse produced signal up to 72 hours after injection. Results were obtained using a 2 cm diameter, 1.4cm length solenoid volume coil with distributed capacitance for maximal SNR. Signal was acquired on a 7.05 T Bruker scanner 2-3 hours following IV or IP injection of EF5. Avertin was used for anaesthesia predominately, since the inhaled anaesthetics isofluorane and halothane contained fluorine signal. Sample absolute quantification tests were made to determine the accuracy of measurements, with resulting coefficients of variance equal to 2.4% and 4.2% for XWIN-NMR and AMARES quantification algorithms respectively. Results confirmed that MRS of EF5 in mice is an unsuitable technique for the determination of EF5 bound to cellular macromolecules. The desire to quantify EF5 bound to macromolecules non-invasively in hypoxic regions would serve as a valuable prognostic tool for cancer therapy. The defined method can instead provide an indicator of the lack of macromolecular binding and potentially the degree of thiol binding in certain controlled tumour environments.
Superconducting nanostructures fabricated with the STM
Creators: name: Rodrigo, J. G.
name: Suderow, H.
name: Vieira, S.
name: Bascones, E.
name: Guinea, F.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The properties of nanoscopic superconducting structures fabricated with a scanning tunnelling microscope are reviewed, with emphasis on the effects of high magnetic fields. These systems include the smallest superconducting junctions which can be fabricated, and they are a unique laboratory where to study superconductivity under extreme conditions. The review covers a variety of recent experimental results on these systems, highlighting their unusual transport properties, and theoretical models developed for their understanding.
description: Topical Review, 35 pages, 18 figures (with reduced quality to decrease file size)
مساهمة المرأة الريفية فى اتخاذ القرارات الانتاجية للأنشطة الحيوانية بإحدى قرى محافظة الشرقية
Creators: name: Soliman, Ibrahim
name: Zaki, Elshahat
name: Rashad, Tesbi
name: Soliman, Ibrahim
name: Zaki, Elshahat
name: Rashad, Tesbi
Publisher: name: Unknown
Year: 1987
Subjects: subject: Farm Management
subject: Livestock Production/Industries
subject: Production Economics
subject: Public Economics
subject: The contribution of rural women in decision-making animal productivity in one of the villages in the Sharkia Governorate
subject: rural women
subject: decision-making
subject: villages

description: The study concerned the role of the rural women in the livestock production decisions. The decisions were three groups. Investment, purchase of inputs and production operations. The objective was covered by a sample survey of 75 farm households in an Egyptian village, in Sharkia government in 1985. Association between the women role and some socio-economic features were tested using chi square test. The conclusion is that when an implementation program is devoted to develop the livestock on farm it is recommended to consider mainly the women members of the farm household, particularly the wives of the age 30-45 years old, inspite of the education level, and it is preferable to focus upon the category of the households of less than 5 feddans. However it is recommended to apply this survey to include other governorates and also upper Egypt.
description: The contribution of rural women in decision-making animal productivity in one of the villages in the eastern province of activities, rural women, decision-making, villages
Spectro-polarimetric analysis of prompt emission of GRB 160325A: jet with evolving environment of internal shocks
Creators: name: Sharma, Vidushi
name: Iyyani, Shabnam
name: Bhattacharya, Dipankar
name: Chattopadhyay, Tanmoy
name: Vadawale, Santosh V.
name: Bhalerao, Varun. B.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: GRB 160325A is the only bright burst detected by AstroSat CZT Imager in its primary field of view to date. In this work, we present the spectral and polarimetric analysis of the prompt emission of the burst using AstroSat, Fermi and Niel Gehrels Swift observations. The prompt emission consists of two distinct emission episodes separated by a few seconds of quiescent/ mild activity period. The first emission episode shows a thermal component as well as a low polarisation fraction of $PF < 37\, \%$ at $1.5\, σ$ confidence level. On the other hand, the second emission episode shows a non-thermal spectrum and is found to be highly polarised with $PF > 43\, \%$ at $1.5 σ$ confidence level. We also study the afterglow properties of the jet using {\it Swift}/XRT data. The observed jet break suggests that the jet is pointed towards the observer and has an opening angle of $1.2^{\circ}$ for an assumed redshift, $z = 2$. With composite modelling of polarisation, spectrum of the prompt emission and the afterglow, we infer that the first episode of emission originates from the photosphere with localised dissipation happening below it, and the second from the optically thin region above the photosphere. The photospheric emission is generated mainly by inverse Compton scattering, whereas the emission in the optically thin region is produced by the synchrotron process. The low radiation efficiency of the burst suggests that the outflow remains baryonic dominated throughout the burst duration with only a subdominant Poynting flux component, and the kinetic energy of the jet is likely dissipated via internal shocks which evolves from an optically thick to optically thin environment within the jet.
description: 15 pages, 13 figures, accepted for publication in MNRAS
Basis set calculations of heavy atoms
Creators: name: Kozlov, M. G.
name: Demidov, Yu. A.
name: Kaygorodov, M. Y.
name: Triapitsyna, E. V.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Most modern calculations of many-electron atoms use basis sets of atomic orbitals. An accurate account for the electronic correlations in heavy atoms is very difficult computational problem and optimization of the basis sets can reduce computational costs and increase final accuracy. Here we suggest a simple differential ansatz to form virtual orbitals from the Dirac-Fock orbitals of the core and valence electrons. We use basis sets with such orbitals to calculate different properties in Cs including hyperfine structure constants and QED corrections to the valence energies and to the E1 transition amplitudes.
Star and cluster formation in extreme environments
Creators: name: de Grijs, Richard
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Current empirical evidence on the star-formation processes in the extreme, high-pressure environments induced by galaxy encounters (mostly based on high-resolution Hubble Space Telescope observations) strongly suggests that star CLUSTER formation is an important and perhaps even the dominant mode of star formation in such starburst events. The sizes, luminosities, and mass estimates of the young massive star clusters (YMCs) are entirely consistent with what is expected for young Milky Way-type globular clusters (GCs). Recent evidence lends support to the scenario that GCs, which were once thought to be the oldest building blocks of galaxies, are still forming today. Here, I present a novel empirical approach to assess the shape of the initial-to-current YMC mass functions, and hence their possible survival chances for a Hubble time.
description: 6 pages, LaTeX with Kluwer style files included; to appear in: "Starbursts - from 30 Doradus to Lyman break galaxies" (Cambridge UK, September 2004; talk summary), Astrophysics & Space Science Library, eds. de Grijs R., Gonzalez Delgado R.M., Kluwer: Dordrecht
Discrete skew selfadjoint canonical systems and the isotropic Heisenberg magnet model
Creators: name: Kaashoek, M. A.
name: Sakhnovich, A. L.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Spectral Theory (math.SP)
subject: Mathematical Physics (math-ph)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 39A12; 35Q51; 35Q55

description: A discrete analog of a skew selfadjoint canonical (Zakharov-Shabat or AKNS) system with a pseudo-exponential potential is introduced. For the corresponding Weyl function the direct and inverse problem are solved explicitly in terms of three parameter matrices. As an application explicit solutions are obtained for the discrete integrable nonlinear equation corresponding to the isotropic Heisenberg magnet model. State space techniques from mathematical system theory play an important role in the proofs.
Convergent Asymptotic Expansions of Charlier, Laguerre and Jacobi Polynomials
Creators: name: López, José L.
name: Temme, Nico M.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 33C45, 41A60, 30E20

description: Convergent expansions are derived for three types of orthogonal polynomials: Charlier, Laguerre and Jacobi. The expansions have asymptotic properties for large values of the degree. The expansions are given in terms of functions that are special cases of the given polynomials. The method is based on expanding integrals in one or two points of the complex plane, these points being saddle points of the phase functions of the integrands.
description: 20 pages, 5 figures. Keywords: Charlier polynomials, Laguerre polynomials, Jacobi polynomials, asymptotic expansions, saddle point methods, two-points Taylor expansions
Scattering model for quantum random walk on the hypercube
Creators: name: Košík, Jozef
name: Bužek, Vladimír
Publisher: name: arXiv
Year: 2004
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We elaborate on a model of quantum random walk proposed by Hillery et. al., and Jeong et. al., which uses the multiports for quantum "coin tossing". The dynamics of this model is analyzed for the case when the multiports are arranged on the hypercube. If the hypercube is attached to semi-infinite lines, then it can act as a scattering potential, which can be reduced to a quantum walk on the line with non-unitary evolution. We also show how this model can be implemented using simple quantum gates.
description: 9 pages, 10 figures. To appear in Phys. Rev. A. Corrected bibliography
Catch and release of propagating bosonic field with non-Markovian giant atom
Creators: name: Xu, Luting
name: Guo, Lingzhen
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The non-Markovianity of physical systems is considered to be a valuable resource that has potential applications to quantum information processing. The control of traveling quantum fields encoded with information (flying qubit) is crucial for quantum networks. In this work, we propose to catch and release the propagating photon/phonon with a non-Markovian giant atom, which is coupled to the environment via multiple coupling points. Based on the Heisenberg equation of motion for the giant atom and field operators, we calculate the time-dependent scattering coefficients from the linear response theory and define the criteria for the non-Markovian giant atom. We analyze and numerically verify that the field bound states due to non-Markovianity can be harnessed to catch and release the propagating bosonic field on demand by tuning the parameters of giant atom.
description: 26 pages, 7 figures
Transport and structure in nanoscale channels
Creators: name: Lakatos, Gregory William
Publisher: name: University of British Columbia
Year: 2010

description: Driven by the rapidly advancing fields of nano- and biotechnology, there has been an explosion of interest in molecular transport and structure formation on small length scales. A canonical model for the transport of particles along one dimensional pathways in nanoscale channels is the Totally Asymmetric Simple Exclusion Process (TASEP). After introducing the standard TASEP, modifications of the TASEP designed to increase its utility in modeling biological transport processes are described. One variant of the TASEP is particularly suitable for modeling protein translation, and the results of using this variant to investigate the effects of slow-codons on the translation process are discussed. A related topic is the voltage-driven translocation of DNA hairpins through membrane-embedded nanopores. Motivated by recent experiments, a stochastic model is developed that couples the translocation and dehybridization of the DNA hairpin. This model is used to explore the behaviour of the mean translocation time of hairpins as a function of driving voltage, and two translocation mechanisms are identified and discussed. Finally, the adsorption and equilibrium structures of water in the interior of ion-bearing nanoscale pores are considered. The behaviour of water and ions under confinement is critical to the functioning of biological ion channels and nanoporous filters. Here, the adsorption isotherms of water are examined, and the layered structures formed by the confined water are described.
Fate of Boltzmann's breathers: Stokes hypothesis and anomalous thermalization
Creators: name: de Soria, M. I. García
name: Maynar, P.
name: Guéry-Odelin, David
name: Trizac, Emmanuel
Publisher: name: arXiv
Year: 2023
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Boltzmann showed that in spite of momentum and energy redistribution through collisions, a rarefied gas confined in a isotropic harmonic trapping potential does not reach equilibrium; it evolves instead into a breathing mode where density, velocity and temperature oscillate. This counter-intuitive prediction is upheld by cold atoms experiments. Yet, are the breathers eternal solutions of the dynamics even in an idealized and isolated system? We show by a combination of hydrodynamic arguments and Molecular Dynamics simulations that an original dissipative mechanism is at work, where the minute and often neglected bulk viscosity eventually thermalizes the system, that thus reaches equilibrium.
نحو توفير فرص عمل جديدة فى القطاع الزراعى فى مصر
Creators: name: Soliman, Ibrahim
name: Gaber, Mohamed
name: Soliman, Ibrahim
name: Gaber, Mohamed
Publisher: name: Unknown
Year: 1991
Subjects: subject: Labor and Human Capital
subject: Public Economics
subject: Towards providing new job opportunities in the agricultural sector in Egypt
subject: Egypt
subject: new job opportunities
subject: agricultural sector

description: Egyptian Journal of Agricultural Economics, Volume 1, No 1, March 1991. Published by Egyptian Association of Agricultural Economics, Egypt
Additional file 1 of Nitrous oxide/oxygen plus acetaminophen versus morphine in ST elevation myocardial infarction: open-label, cluster-randomized, non-inferiority study
Creators: name: Charpentier, Sandrine
name: Galinski, Michel
name: Bounes, Vincent
name: Ricard-Hibon, Agnès
name: El-Khoury, Carlos
name: Meyer Elbaz
name: François-Xavier Ageron
name: Manzo-Silberman, Stéphane
name: Soulat, Louis
name: Lapostolle, Frédéric
name: Gérard, Alexandre
name: Bregeaud, Delphine
name: Bongard, Vanina
name: Bonnefoy-Cudraz, Eric
Publisher: name: figshare
Year: 2020
Subjects: subject: Biochemistry
subject: Medicine
subject: Neuroscience
subject: Physiology
subject: FOS: Biological sciences
subject: Science Policy
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Additional file 1:Appendix 1. SCADOL II Investigators list. Appendix 2. CONSORT 2010 checklist of information to include when reporting a randomised trial. Appendix 3. Definition of secondary outcomes. Appendix Table 1. Characteristics of Patients in the Intention-To-Treat Population. Appendix Table 2. Characteristics of Patients Who Died Within 30 Days.
Bounds on light sterile neutrino mass and mixing from cosmology and laboratory searches
Creators: name: Hagstotz, Steffen
name: de Salas, Pablo F.
name: Gariazzo, Stefano
name: Gerbino, Martina
name: Lattanzi, Massimiliano
name: Vagnozzi, Sunny
name: Freese, Katherine
name: Pastor, Sergio
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We provide a consistent framework to set limits on properties of light sterile neutrinos coupled to all three active neutrinos using a combination of the latest cosmological data and terrestrial measurements from oscillations, $β$-decay and neutrinoless double-$β$ decay ($0νββ$) experiments. We directly constrain the full $3+1$ active-sterile mixing matrix elements $|U_{\alpha4}|^2$, with $α\in ( e,μ,τ)$, and the mass-squared splitting $Δm^2_{41} \equiv m_4^2-m_1^2$. We find that results for a $3+1$ case differ from previously studied $1+1$ scenarios where the sterile is only coupled to one of the neutrinos, which is largely explained by parameter space volume effects. Limits on the mass splitting and the mixing matrix elements are currently dominated by the cosmological data sets. The exact results are slightly prior dependent, but we reliably find all matrix elements to be constrained below $|U_{\alpha4}|^2 \lesssim 10^{-3}$. Short-baseline neutrino oscillation hints in favor of eV-scale sterile neutrinos are in serious tension with these bounds, irrespective of prior assumptions. We also translate the bounds from the cosmological analysis into constraints on the parameters probed by laboratory searches, such as $m_β$ or $m_{ββ}$, the effective mass parameters probed by $β$-decay and $0νββ$ searches, respectively. When allowing for mixing with a light sterile neutrino, cosmology leads to upper bounds of $m_β< 0.09$ eV and $m_{ββ} < 0.07$ eV at 95\% C.L, more stringent than the limits from current laboratory experiments.
description: 29 pages, 7 figures
Static properties and spin dynamics of the ferromagnetic spin-1 Bose gas in magnetic field
Creators: name: Kis-Szabo, Krisztian
name: Szepfalusy, Peter
name: Szirmai, Gergely
Publisher: name: arXiv
Year: 2004
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Properties of spin-1 Bose gases with ferromagnetic interaction in the presence of a nonzero magnetic field are studied. The equation of state and thermodynamic quantities are worked out with the help of a mean-field approximation. The phase diagram besides Bose-Einstein condensation contains a first order transition where two values of the magnetization coexist. The dynamics is investigated with the help of the Random Phase Approximation. The soft mode corresponding to the critical point of the magnetic phase transition is found to behave like in conventional theory.
description: 8 pages and 3 figures included in text, submitted to Physical Review A
Space-based Extensive Air Shower Optical Cherenkov and Fluorescence Measurements using SiPM Detectors in context of POEMMA
Creators: name: Krizmanic, John F.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Developed as NASA Astrophysics Probe-class mission, the Probe Of Extreme Multi-Messenger Astrophysics (POEMMA) is designed to identify the sources of ultra-high energy cosmic rays (UHECRs) and to observe cosmic neutrinos. POEMMA consists of two spacecraft flying in a loose formation at 525 km altitude, 28.5$^\circ$ inclination orbits. Each spacecraft hosts a Schmidt telescope with a large collecting area and wide Field-of-View (FoV). A novel focal plane is employed that is optimized to observe both the UV fluorescence signal from extensive air showers (EASs) and the optical Cherenkov signals from EASs. In UHECR stereo fluorescence mode, POEMMA will measure the spectrum, composition, and full-sky distribution of the UHECRs above 20 EeV with high statistics along with remarkable sensitivity to UHE neutrinos. The POEMMA spacecraft are designed to quickly re-orient to a Target-of-Opportunity (ToO) neutrino mode to observe transient astrophysical sources with unique sensitivity. In this mode, POEMMA will be able to detect cosmic tau neutrino events above 20 PeV by measuring the upward-moving EASs for $τ$-lepton decays induced from tau neutrino interactions in the Earth. In this paper, POEMMA's science goals and instrument design are summarized with a focus on the SiPM implementation in POEMMA, along with a detailed discussion of the properties of the Cherenkov EAS signal in the context of wide wavelength sensitivity offered by SiPMs. A comparison of the fluorescence response between SiPMs and the MAPMTs currently planned for use in POEMMA will also be discussed, assessing the potential for SiPMs to perform EAS fluorescence measurements.
description: 8 pages, 8 figures, Final version for publication in the SiPM Workshop Bari 2019 conference proceedings
Status of direct detection searches of heavy dark matter
Creators: name: Kuźniak, Marcin
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Dark matter accounts for 26% of the mass-energy density of the Universe, however, its nature and origins remain the most important open questions in physics. The search for Weakly Interacting Massive Particles (WIMPs), one of the leading dark matter particle candidates, is now in a decisive phase, with experiments targeting both the high-mass and the low-mass (1-10 GeV/$c^2$) WIMP scenarios. The status of the leading experimental searches is discussed, together with their prospects and challenges they are facing. Searches of heavy non-WIMP dark matter candidates are also briefly summarized.
description: Proceedings of XVIII International Conference on Topics in Astroparticle and Underground Physics (TAUP2023)
Characterizing The Many-Body Localization via Studying State Sensitivity to Boundary Conditions
Creators: name: Pouranvari, Mohammad
name: Liou, Shiuan-Fan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We introduce novel characterizations for many-body phase transitions between delocalized and localized phases based on the system's sensitivity to boundary conditions. In particular, we change boundary conditions from periodic to antiperiodic and calculate shift in the system's energy and shifts in the single-particle density matrix eigenvalues in the corresponding energy window. We employ the typical model for studying MBL, a one-dimensional disordered system of fermions with nearest-neighbor repulsive interaction where disorder is introduced as randomness on on-site energies. By calculating numerically the shifts in the system's energy and eigenvalues of the single-particle density matrix, we observe that in the localized regime, both shifts are vanishing; while in the extended regime, both shifts are on the order of the corresponding level spacing. We also applied these characterizations of the phase transition to the case of having next-nearest-neighbor interactions in addition to the nearest-neighbor interactions, and studied its effect on the transition.
description: 9 pages, 8 figures
Transfer learning based multi-fidelity physics informed deep neural network
Creators: name: Chakraborty, Souvik
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: Computational Physics (physics.comp-ph)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: For many systems in science and engineering, the governing differential equation is either not known or known in an approximate sense. Analyses and design of such systems are governed by data collected from the field and/or laboratory experiments. This challenging scenario is further worsened when data-collection is expensive and time-consuming. To address this issue, this paper presents a novel multi-fidelity physics informed deep neural network (MF-PIDNN). The framework proposed is particularly suitable when the physics of the problem is known in an approximate sense (low-fidelity physics) and only a few high-fidelity data are available. MF-PIDNN blends physics informed and data-driven deep learning techniques by using the concept of transfer learning. The approximate governing equation is first used to train a low-fidelity physics informed deep neural network. This is followed by transfer learning where the low-fidelity model is updated by using the available high-fidelity data. MF-PIDNN is able to encode useful information on the physics of the problem from the {\it approximate} governing differential equation and hence, provides accurate prediction even in zones with no data. Additionally, no low-fidelity data is required for training this model. Applicability and utility of MF-PIDNN are illustrated in solving four benchmark reliability analysis problems. Case studies to illustrate interesting features of the proposed approach are also presented.
Traces of Memorisation in Large Language Models for Code
Creators: name: Al-Kaswan, Ali
name: Izadi, Maliheh
name: van Deursen, Arie
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cryptography and Security (cs.CR)
subject: Artificial Intelligence (cs.AI)
subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Large language models have gained significant popularity because of their ability to generate human-like text and potential applications in various fields, such as Software Engineering. Large language models for code are commonly trained on large unsanitised corpora of source code scraped from the internet. The content of these datasets is memorised and can be extracted by attackers with data extraction attacks. In this work, we explore memorisation in large language models for code and compare the rate of memorisation with large language models trained on natural language. We adopt an existing benchmark for natural language and construct a benchmark for code by identifying samples that are vulnerable to attack. We run both benchmarks against a variety of models, and perform a data extraction attack. We find that large language models for code are vulnerable to data extraction attacks, like their natural language counterparts. From the training data that was identified to be potentially extractable we were able to extract 47% from a CodeGen-Mono-16B code completion model. We also observe that models memorise more, as their parameter count grows, and that their pre-training data are also vulnerable to attack. We also find that data carriers are memorised at a higher rate than regular code or documentation and that different model architectures memorise different samples. Data leakage has severe outcomes, so we urge the research community to further investigate the extent of this phenomenon using a wider range of models and extraction techniques in order to build safeguards to mitigate this issue.
description: ICSE 2024 Research Track
Dinâmica Temporal do Assentamento e os Projetos de Vida da Juventude Rural
Creators: name: Lopes, Leandro Gomes Reis
name: Carvalho, Denis Barros De
name: Lopes, Leandro Gomes Reis
name: Carvalho, Denis Barros De
Publisher: name: Unknown
Year: 2015
Subjects: subject: Agribusiness
subject: Space appropriation
subject: Rural youth
subject: Identity.

description: In this research the appropriation of space by rural youth is discussed, taking in perspective the temporal dimension of sustainability of a rural settlement organized by Landless Rural Workers Movement (MST), in Teresina, Piauí, Brasil. Mostly young settled people are inserted in the struggle for land as a result of the decision of their parents. Therefore, from this fight they will have to (re) construct their life projects within the settlement, tensioned by transformations of the rural world and characteristic problems of the youth in rural areas. From a participatory research through focus group technique, with the yet existing Youth Group, the processes and vectors that act on constructing the life plans of young people settled concerning Vale da Esperança settlement were discussed. The data were analyzed using the technique of Categorization of Content Analysis, which pointed to the importance of the form of insertion of the classes on land as well as activities of the social mediators in the space appropriation and construction of life projects for the settlement itself.
description: 18
On the Zeros of Quasi-Polynomials with Single Delay
Creators: name: Gumussoy, Suat
Publisher: name: arXiv
Year: 2020
Subjects: subject: Systems and Control (eess.SY)
subject: Optimization and Control (math.OC)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Mathematics

description: A new numerical method is introduced for calculation of quasi-polynomial zeros with constant single delay. The trajectories of zeros are obtained depending on time-delay from zero to final time-delay value. The method determines all the zeros of the quasi-polynomial in any right half-plane. The approach is used to determine stability analysis of time-delay systems. The method is easy to implement, robust and applicable to quasi-polynomials with high order. The effectiveness of the method is shown on an example.
Production of vector mesons and measurement of the hadronic component of photon light-cone wave function at HERA
Creators: name: Coppola, N.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A detailed study of vector meson production ($ϕ$ and $J/ψ$) in $e^\pm p$ collisions at HERA with the ZEUS and H1 detector has been performed. The cross sections are measured as a function of $Q^2$, $W$ and $t$. In this contribution, the results are summarised, compared to theoretical calculations and the dynamical picture emerging in perturbative QCD is highlighted. The measurement of the hadronic component of the photon light-cone wave function in the exclusive production of di-pions, $ep\to e π^+π^- p$ is also reported.
description: 4 pages, 6 figures, Submitted to be published in the Proceedings of to 32nd International Conference on High-Energy Physics (ICHEP 04), Beijing, China, 16-22 Aug 2004
Características Socioeconômicas do Assentamento Banco da Terra, Nova Xavantina (MT): uma análise sob a ótica da adoção ou construção de conhecimentos
Creators: name: Moraes, Murilo Didonet De
name: Sant’Ana, Antonio Lázaro
name: Moraes, Murilo Didonet De
name: Sant’Ana, Antonio Lázaro
Publisher: name: Unknown
Year: 2015
Subjects: subject: Agribusiness
subject: Family farming
subject: Adoption process
subject: Producer’s profile.

description: This paper examines the ways that the socioeconomic characteristics of family farmers influence the adoption process or construction of knowledge in Banco da Terra Settlement in Nova Xavantina, Mato Grosso State, Brazil. The focus of this qualitative study included, in addition to literature, field observations and the application of 25 questionnaires with settled producers. The results showed that 40% of surveyed farmers are between 41 and 50 years old and 24% are older than 60, most of them do not have the complete primary school (68%) and the gross monthly income level of 64% of households is up to two minimum wages per month. The main source of income presented was the partial renting; however, the resulting incomes from off-farm labor and from retirement/pensions are also important. Thus, it is concluded that these characteristics outlined serve as a warning to local extension, for promoting highly dependent - labor knowledge or more complex skills that present a high risk of rejection or failure. Thus, the most assertive way forward for the extension is from this economic reality to establish a dialogue with settled families.
Two-Step Electronic Response to Magnetic Ordering in a van der Waals Ferromagnet
Creators: name: Wu, Han
name: Zhu, Jian-Xin
name: Chen, Lebing
name: Butcher, Matthew W
name: Yue, Ziqin
name: Yuan, Dongsheng
name: He, Yu
name: Oh, Ji Seop
name: Huang, Jianwei
name: Wu, Shan
name: Gong, Cheng
name: Guo, Yucheng
name: Mo, Sung-Kwan
name: Denlinger, Jonathan D.
name: Lu, Donghui
name: Hashimoto, Makoto
name: Stone, Matthew B.
name: Kolesnikov, Alexander I.
name: Chi, Songxue
name: Kono, Junichiro
name: Nevidomskyy, Andriy H.
name: Birgeneau, Robert J.
name: Dai, Pengcheng
name: Yi, Ming
Publisher: name: arXiv
Year: 2023
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The two-dimensional (2D) material Cr$_2$Ge$_2$Te$_6$ is a member of the class of insulating van der Waals magnets. Here, using high resolution angle-resolved photoemission spectroscopy in a detailed temperature dependence study, we identify a clear response of the electronic structure to a dimensional crossover in the form of two distinct temperature scales marking onsets of modifications in the electronic structure. Specifically, we observe Te $p$-orbital-dominated bands to undergo changes at the Curie transition temperature T$_C$ while the Cr $d$-orbital-dominated bands begin evolving at a higher temperature scale. Combined with neutron scattering, density functional theory calculations, and Monte Carlo simulations, we find that the electronic system can be consistently understood to respond sequentially to the distinct temperatures at which in-plane and out-of-plane spin correlations exceed a characteristic length scale. Our findings reveal the sensitivity of the orbital-selective electronic structure for probing the dynamical evolution of local moment correlations in vdW insulating magnets.
description: PRB, in press
Integração Entre os Estados Brasileiros Produtores de Etanol
Creators: name: Moraes, Marcelo Lopes De
name: Bacchi, Mirian Rumenos Piedade
name: Moraes, Marcelo Lopes De
name: Bacchi, Mirian Rumenos Piedade
Publisher: name: Unknown
Year: 2015
Subjects: subject: Agribusiness
subject: Ethanol
subject: Prices
subject: Market integration.

description: The objective of the present study is to analyze the long-run relation of ethanol price in different producing states in Brazil: Paraná, São Paulo, Minas Gerais, Goiás, Mato Grosso and Mato Grosso do Sul (Central-South) and Alagoas and Pernambuco (North-Northeast), to identify the dynamic process of price establishment. Monthly data from April 2008 to March 2013 were used with the methodology of cointegration model described by Johansen (1988) and tests on β and α parameters of cointegration vector to analyze perfect integration and integration relations, although non perfect integrated. The results showed that São Paulo, Paraná, Minas Gerais and Goiás are perfectly integrated. Moreover, these states showed non perfect integration with the states of North-Northeast and Mato Grosso. The states of North-Northeast region are perfectly integrated.
Estudo Sobre a Decomposição dos Determinantes da Variação da Pobreza nos Estados Brasileiros no Período 2001 a 2012
Creators: name: Silva, Janaina Cabral Da
name: Araujo, Jair Andrade
name: Silva, Janaina Cabral Da
name: Araujo, Jair Andrade
Publisher: name: Unknown
Year: 2015
Subjects: subject: Agribusiness
subject: Decomposition
subject: Poverty
subject: Inequality
subject: Economic growth.

description: Basing on theories that seek to relate poverty, inequality and economic growth, the aim of this study is to decompose the variation of poverty through the following factors: trend effect, growth effect, inequality effect and residual effect of the Brazilian states between 2001 and 2012. It starts from the estimation of a statistics model with data in a panel, using the following variables: poverty, household income, per capita and the Gini index, extracted from PNAD. On this methodology is valid to point that the trend effect is a distinction, once it was not used yet in decomposition to rural area, but just for urban zone. Concerning about the aspect of poverty reduction, the results found show that, in most part of states, the growth effect excelled over the others during the analyzed period. Nevertheless, the distribution effect also had its importance in the process, followed by the trend effect. However, the residual effect had little relevance.
O Comportamento do Preço da Terra Agrícola: um modelo de painel de dados espaciais
Creators: name: Malassise, Regina Lúcia Sanches
name: Parré, José Luiz
name: Fraga, Gilberto Joaquim
name: Malassise, Regina Lúcia Sanches
name: Parré, José Luiz
name: Fraga, Gilberto Joaquim
Publisher: name: Unknown
Year: 2015
Subjects: subject: Agribusiness
subject: Paraná State
subject: Land prices
subject: Spatial econometrics
subject: Panel data.

description: This study analyzes the behavior of the agricultural land price in the municipalities of Paraná State over the period 1999-2011. After literature review of the main studies of this field, the determinants of land price and methodology to be used were identified. For this purpose, we estimate the empirical model for price of agricultural land through spatial data panel. The results show that main statistically significant variables to explain the price of agricultural land in Paraná State are the gross value of agricultural production, asset valuation, total financing in agriculture, ratio municipal investment-deterincome, percentage of planted soybeans in the municipality and the incorporation of spatial dependence on land prices. These variables can explain around 84% of the prices and indicate that the data presented great intrapanel fit, and the spatial effects would be more intense in the municipality itself and in relation to the whole. The proposed model, specially, advanced in structural terms, by incorporating data from all 399 municipalities in Paraná. Empirically, the study advanced by estimating through panel data and considering the influence of spatial effects on the agricultural land price, highlighting the importance of the location and neighborhood in the price determination.
Additional file 2 of Promoter methylation changes in ALOX12 and AIRE1: novel epigenetic markers for atherosclerosis
Creators: name: Kim, Jee Yeon
name: Bong-Geun Choi
name: Jelinek, Jaroslav
name: Kim, Dae Hyun
name: Lee, Seo Hyun
name: Kwangjo Cho
name: Rha, Seo Hee
name: Lee, Young Ho
name: Jin, Hyo Sun
name: Dae-Kyoung Choi
name: Geun-Eun Kim
name: Kwon, Sun U.
name: Junha Hwang
name: Cha, Jae Kwan
name: Sukhoon Lee
name: Issa, Jean-Pierre J.
name: Jei Kim
Publisher: name: figshare
Year: 2020
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 2: Table S1. Demographics and blood tests of 36 ischemic stroke patients included for the methylation evaluation of the 5 target genes in inflammatory cell of blood.
O Programa Brasileiro de Biodiesel e o Risco Associado ao Preço da Mamona em Irecê, Bahia
Creators: name: Ferreira, Marcelo Dias Paes
name: Daniel, Lindomar Pegorini
name: Lima, João Eustáquio De
name: Ferreira, Marcelo Dias Paes
name: Daniel, Lindomar Pegorini
name: Lima, João Eustáquio De
Publisher: name: Unknown
Year: 2015
Subjects: subject: Agribusiness
subject: Farm-gate price
subject: PNPB
subject: TGARCH
subject: EGARCH.

description: This study aimed to assess the structural instability of castor bean price in Bahia state, Brazil, and to verify if The Brazilian National Program for Production and Use of Biodiesel (PNPB) has increased castor bean price instability. We modeled price instability by TGARCH and EGARCH conditional heteroscedasticity approaches. Results point out that castor bean prices in Bahia are structurally volatile, a price increase leads to a higher instability, and PNPB raised castor bean price volatility in Bahia. As farmers are risk averse, the PNPB became castor bean cultivation less attractive, which may have contributed to the null use of castor bean as a raw material within the program.
Qualidade Instrumental e Sensorial de Papaia Produzida em Cabo Verde, e Análise Crítica da Sua Importação
Creators: name: Simões, Elsa Barbosa
name: Santos, Ana Cristina Agulheiro
name: Lucas, Maria Raquel
name: Simões, Elsa Barbosa
name: Santos, Ana Cristina Agulheiro
name: Lucas, Maria Raquel
Publisher: name: Unknown
Year: 2015
Subjects: subject: Agribusiness
subject: Papaya
subject: Quality evaluation
subject: Importation.

description: The objective of the study was to characterize the quality attributes of two varieties papaya varieties (Solo and Local) produced in Santiago, Cape Verde, and define the attributes that the distributors are looking for. Physicochemical assessments, sensory evaluation and a market study were carried out. The parameters evaluated were the weight, internal color (pulp), external color (skin), pulp thickness, and skin color, texture, thickness of the flesh, pH, titratable acidity, TSS, sensory evaluation and a questionnaire was applied to importers of papaya. The parameters TSS, acidity, pH and weight vary significantly within varieties and papayas of Local variety are heavier. The texture varies depending on the degree of ripeness, firmness shows a decrease during ripening, for deformation a decrease is noticed with advancing of maturation, the external and internal color differences are in the interaction between Variety x Maturation. In the sensorial evaluation, Solo variety was more valued as was price, certification/quality seal quality and sweetness valued by distributors.
title: An empirical approach to risk modeling in brownfield regeneration
Creators: name: Jafari, Naghmeh
Publisher: name: TU Wien
Year: 2017
Subjects: subject: Risk Modeling
subject: Brownfeld Regeneration

description: Over the last decade, regeneration of derelict and underused sites with varying degrees of contamination (also known as Brownfield sites) has gained popularity as a sustainable land use strategy. However, redevelopment of contaminated fields is a complex and multidimensional problem that entails many risks and uncertainties. The objective of this thesis is to construct, calibrate and validate a risk assessment model that can assist investors and decision-makers in evaluating and classifying brownfield sites to two categories : suitable for redevelopment / not suitable for redevelopment. The three-step model building process is adopted from the methodology of credit risk modeling used in banks and credit rating agencies. The proposed models utilize two machine learning algorithms, namely Classification And Regression Trees (CART), and Random Forest algorithms. The first part of the thesis provides a point of reference in browfield regeneration risk modeling and describes the current research gaps in this field. The following chapter describes the credit risk model building methodology. Finally, Chapter 4 describes the implementation of risk model building methodology in the field of brownfield risk modeling using programming language R. Appendix A includes the commented Rcode for interested readers and can serve as a guideline in implementing the Classification And Regression Tree, and Random Forest algorithms in various fields of study.
Fixed-Order H-infinity Controller Design via HIFOO, a Specialized Nonsmooth Optimization Package
Creators: name: Gumussoy, Suat
name: Overton, Michael L.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: We report on our experience with fixed-order H-infinity controller design using the HIFOO toolbox. We applied HIFOO to various benchmark fixed (or reduced) order H-infinity controller design problems in the literature, comparing the results with those published for other methods. The results show that HIFOO can be used as an effective alternative to existing methods for fixed-order HIFOO controller design.