cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Towards Causal Deep Learning for Vulnerability Detection
Creators: name: Rahman, Md Mahbubur
name: Ceka, Ira
name: Mao, Chengzhi
name: Chakraborty, Saikat
name: Ray, Baishakhi
name: Le, Wei
Publisher: name: arXiv
Year: 2023
Subjects: subject: Software Engineering (cs.SE)
subject: Cryptography and Security (cs.CR)
subject: Machine Learning (cs.LG)
subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: Deep learning vulnerability detection has shown promising results in recent years. However, an important challenge that still blocks it from being very useful in practice is that the model is not robust under perturbation and it cannot generalize well over the out-of-distribution (OOD) data, e.g., applying a trained model to unseen projects in real world. We hypothesize that this is because the model learned non-robust features, e.g., variable names, that have spurious correlations with labels. When the perturbed and OOD datasets no longer have the same spurious features, the model prediction fails. To address the challenge, in this paper, we introduced causality into deep learning vulnerability detection. Our approach CausalVul consists of two phases. First, we designed novel perturbations to discover spurious features that the model may use to make predictions. Second, we applied the causal learning algorithms, specifically, do-calculus, on top of existing deep learning models to systematically remove the use of spurious features and thus promote causal based prediction. Our results show that CausalVul consistently improved the model accuracy, robustness and OOD performance for all the state-of-the-art models and datasets we experimented. To the best of our knowledge, this is the first work that introduces do calculus based causal learning to software engineering models and shows it's indeed useful for improving the model accuracy, robustness and generalization. Our replication package is located at https://figshare.com/s/0ffda320dcb96c249ef2.
description: ICSE 2024, Camera Ready Version
An update on the SCUBA-2 project
Creators: name: Audley, Michael
name: Holland, Wayne
name: Hodson, Trevor
name: MacIntosh, Mike
name: Robson, Ian
name: Irwin, Kent
name: Hilton, Gene
name: Duncan, William
name: Reintsema, Carl
name: Walton, Anthony
name: Parkes, William
name: Ade, Peter
name: Walker, Ian
name: Fich, Michel
name: Kycia, Jan
name: Halpern, Mark
name: Naylor, David
name: Mitchell, George
name: Bastien, Pierre
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: SCUBA-2, which replaces SCUBA (the Submillimeter Common User Bolometer Array) on the James Clerk Maxwell Telescope (JCMT) in 2006, is a large-format bolometer array for submillimeter astronomy. Unlike previous detectors which have used discrete bolometers, SCUBA-2 has two dc-coupled, monolithic, filled arrays with a total of ~10,000 bolometers. It will offer simultaneous imaging of a 50 sq-arcmin field of view at wavelengths of 850 and 450 microns. SCUBA-2 is expected to have a huge impact on the study of galaxy formation and evolution in the early Universe as well as star and planet formation in our own Galaxy. Mapping the sky to the same S/N up to 1000 times faster than SCUBA, it will also act as a pathfinder for the new submillimeter interferometers such as ALMA. SCUBA-2's absorber-coupled pixels use superconducting transition edge sensors operating at 120 mK for performance limited by the sky background photon noise. The monolithic silicon detector arrays are deep-etched by the Bosch process to isolate the pixels on silicon nitride membranes. Electrical connections are made through indium bump bonds to a SQUID time-domain multiplexer (MUX). We give an overview of the SCUBA-2 system and an update on its status, and describe some of the technological innovations that make this unique instrument possible.
description: 16 pages, 14 figures, Invited talk at SPIE Glasgow 21-25 June 2004, Conference 5498
Status, Challenges and Directions in Indirect Dark Matter Searches
Creators: name: Heros, Carlos Pérez de los
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Indirect searches for dark matter are based on detecting an anomalous flux of photons, neutrinos or cosmic-rays produced in annihilations or decays of dark matter candidates gravitationally accumulated in heavy cosmological objects, like galaxies, the Sun or the Earth. Additionally, evidence for dark matter that can also be understood as indirect can be obtained from early universe probes, like fluctuations of the Cosmic Microwave Background temperature, the primordial abundance of light elements or the Hydrogen 21-cm line. The techniques needed to detect these different signatures require very different types of detectors: air shower arrays, gamma- and X-ray telescopes, Cherenkov telescopes, neutrino telescopes, radio telescopes or particle detectors in balloons or satellites. Although many of these detectors were not originally intended to search for dark matter, they have proven to be unique complementary tools to the direct search efforts. In this review we summarize the current status of indirect searches for dark matter, mentioning also the challenges and limitations that these techniques encounter.
description: Invited review prepared for the Symmetry special issue on Dark Matter and the Characterization of Its Properties
Magnetic diffusion in Solar atmosphere produces measurable electric fields
Creators: name: Anan, Tetsu
name: Casini, Roberto
name: Uitenbroek, Han
name: Schad, Thomas A.
name: Socas-Navarro, Hector
name: Ichimoto, Kiyoshi
name: Jaeggli, Sarah A.
name: Tiwari, Sanjiv K.
name: Reep, Jeffrey W.
name: Katsukawa, Yukio
name: Asai, Ayumi
name: Qiu, Jiong
name: Reardon, Kevin P.
name: Tritschler, Alexandra
name: Wöger, Friedrich
name: Rimmele, Thomas R.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The efficient release of magnetic energy in astrophysical plasmas, such as during solar flares, can in principle be achieved through magnetic diffusion, at a rate determined by the associated electric field. However, attempts at measuring electric fields in the solar atmosphere are scarce, and none exist for sites where the magnetic energy is presumably released. Here, we present observations of an energetic event using the National Science Foundation's Daniel K. Inouye Solar Telescope, where we detect the polarization signature of electric fields associated with magnetic diffusion. We measure the linear and circular polarization across the hydrogen H-epsilon Balmer line at 397 nm at the site of a brightening event in the solar chromosphere. Our spectro-polarimetric modeling demonstrates that the observed polarization signals can only be explained by the presence of electric fields, providing conclusive evidence of magnetic diffusion, and opening a new window for the quantitative study of this mechanism in space plasmas.
description: 24 pages, 11 figures, published in Nature Communications
Dynamical Crossover in Invasion Percolation
Creators: name: Tizdast, S.
name: Ahadpour, N.
name: Najafi, M. N.
name: Ebadi, Z.
name: Mohamadzadeh, H.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The dynamical properties of the invasion percolation on the square lattice are investigated with emphasis on the geometrical properties on the growing cluster of infected sites. The exterior frontier of this cluster forms a critical loop ensemble (CLE), whose length $(l)$, the radius $(r)$ and also roughness $(w)$ fulfill the finite size scaling hypothesis. The dynamical fractal dimension of the CLE defined as the exponent of the scaling relation between $l$ and $r$ is estimated to be $D_f=1.81\pm0.02$. By studying the autocorrelation functions of these quantities we show importantly that there is a crossover between two time regimes, in which these functions change behavior from power-law at the small times, to exponential decay at long times. In the vicinity of this crossover time, these functions are estimated by log-normal functions. We also show that the increments of the considered statistical quantities, which are related to the random forces governing the dynamics of the observables undergo an anticorrelation/correlation transition at the time that the crossover takes place.
title: They Are the Future. Hope and a Call for Action
Creators: name: Siwiak, Agata
Publisher: name: Instytut Im. Jerzego Grotowskiego We Wrocławiu (Wydawca); Wydział Polonistyki UJ (Współwydawca)
Year: 2021

description: The text discusses two theatre performances, h. directed by Daniel Stachuła and To my jesteśmy przyszłością (We Are the Future) directed by Jakub Skrzywanek. Both productions are primarily addressed to teenage audiences and represent engaging theatre. Their main subject is violence suffered by young people due to their psychosexual orientation and gender. The author of the article notes the efficiency (effectiveness) of the two projects, which she associates with the concept of ‘performance of possibilities’. Performative ethnography, but also experimental pedagogy, feminism and studies of homophobic violence provide the research framework for the text.

Keywords: theatre; ethnography; homophobia; pedagogy; violence
An Approach to Gamma-Hadron Separation via Measurements of the Middle-UV Fraction of EAS emission by an Imaging Atmospheric Cherenkov Telescope with UV-Sensitive SiPM detectors
Creators: name: Kholupenko, E. E.
name: Badmaev, D. V.
name: Budnev, N. M.
name: Bykov, A. M.
name: Krassilchtchikov, A. M.
name: Kuzmichev, L. A.
name: Bogdanov, A. A.
name: Chichagov, Yu. V.
name: Repman, G. A.
name: Tuboltsev, Yu. V.
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The operation of a small-size Cherenkov gamma-ray telescope TAIGA-IACT with camera on SiPMs OnSemi MicroFJ-60035 has been modelled by multiparticle Monte Carlo (MC) methods. The model implies that telescope camera is equipped with two specific types of filters of 290-590 nm (visible+NUV) and 220-320 nm (MUV+UVB)-bands, each covering half of the camera pixels in some uniform order. This allows one to measure the fraction of UV-radiation in total amount of Cherenkov radiation of an extensive air shower (EAS), that can be used for efficient gamma-hadron separation. The corresponding quality factor takes values up to 5.07 in the 10-100 TeV range depending on the distance to EAS axis and camera orientation.
description: 22 pages, 5 figures, 10 tables, accepted to Research in Astronomy and Astrophysics
Metallicities of the beta Cephei stars from low-resolution ultraviolet spectra
Creators: name: Niemczura, E.
name: Daszynska-Daszkiewicz, J.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We derive basic stellar parameters (angular diameters, effective temperatures, metallicities) and interstellar reddening for all beta Cephei stars observed during the IUE satellite mission, including those belonging to three open clusters. The parameters are derived by means of an algorithmic procedure of fitting theoretical flux distributions to the low-resolution IUE spectra and ground-based spectrophotometric observations. Since the metallicity has a special importance for pulsating B type stars, we focus our attention in particular on this parameter.
description: 15 pages, 8 figures, 5 tables
From 0.999... = 1 to Physical Singularity: A Conceptual Lens on Infinite Convergence in Physics
Creators: name: Ebadi, Mehran
Publisher: name: Zenodo
Year: 2025
Subjects: subject: Physics
subject: Mathematical physics
subject: Quantum physics
subject: Black holes
subject: convergence
subject: singularity
subject: infinity

description: This is a conceptual idea exploring the analogy between the infinite convergence in mathematics (0.999... = 1) and the infinities present in physical theories, particularly in black holes and singularities. The idea proposes that what we perceive as infinities in physics might actually represent a stable, underlying structure we currently do not fully understand.
Poziom i dynamika zmian zatrudnienia w sektorze rolnym w Polsce na tle innych państw Unii Europejskiej
Creators: name: Szczukocka, Agata
name: Szczukocka, Agata
Publisher: name: Unknown
Year: 2012
Subjects: subject: Agribusiness
subject: Community/Rural/Urban Development
subject: Labor and Human Capital
subject: Public Economics
subject: employment
subject: employment in the agricultural sector
subject: unemployment
subject: / zatrudnienie
subject: zatrudnienie w sektorze rolnym
subject: bezrobocie

description: The problem of employment in the agricultural sector has been brought up. A triple division of the working population between three main sectors in Poland has been introduced, pointing at changes in employment in the last few years. An analysis of statistical data allowed for observation of a decrease in employment in the agricultural and industrial sectors and an increase in employment in the service sector. An attention to the participation of the professionally active population in the rural population in the European Union member states and in Poland has also been paid, with pointing at dominating countries. In the agricultural sector, a rise of unemployment and a lack of ability of taking up work in other sectors are a relevant problem because of a feeble mobility of the rural population, but also the lack of education and the dislike for changing occupation. The most important problems afflicting the Polish country population in the last few years have been paid attention to. / Synopsis. W artykule poruszono problem zatrudnienia w sektorze rolnym. Przedstawiona została trójsektorowa struktura pracujących w Polsce, wskazująca na zachodzące zmiany w zatrudnieniu w ostatnich latach. Analiza danych statystycznych pozwala zaobserwować spadek zatrudnienia w sektorze rolnym i przemysłowym oraz wzrost zatrudnienia w sektorze usług. Zwrócono także uwagę na udział ludności aktywnej zawodowo w rolnictwie w krajach Unii Europejskiej i w Polsce, ze wskazaniem na kraje dominujące. W sektorze rolnym istotnym problemem jest także wzrost bezrobocia i brak możliwości podjęcia pracy w innych, pozarolniczych sektorach ze względu na słabą mobilność ludności wiejskiej a niejednokrotnie także brak wykształcenia i niechęć do zmiany zawodu. W artykule starano się zwrócić uwagę na najważniejsze problemy dotykające polską wieś w ostatnich latach.
Self-Consistent Theory of the Gain Linewidth for Quantum Cascade Lasers
Creators: name: Banit, F.
name: Lee, S. -C.
name: Knorr, A.
name: Wacker, A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The linewidth in intersubband transitions can be significantly reduced below the sum of the lifetime broadening for the involved states, if the scattering environment is similar for both states. This is studied within a nonequilibrium Green function approach here. We find that the effect is of particular relevance for a recent, relatively low doped, THz quantum cascade laser.
description: 3 pages, figures included
Determinanty aktywności innowacyjnej przemysłu spożywczego w Polsce
Creators: name: Świadek, Arkadiusz
name: Świadek, Arkadiusz
Publisher: name: Unknown
Year: 2012
Subjects: subject: Agribusiness
subject: Industrial Organization
subject: Research and Development/Tech Change/Emerging Technologies
subject: Research Methods/ Statistical Methods
subject: innovation
subject: food industry
subject: system
subject: country
subject: / innowacja
subject: przemysł spożywczy
subject: państwo

description: The food industry is one of the low technology sectors. This does not change the fact that it has the largest share of industrial production in Poland. This in turn follows from the fact that the national economy consists for the largest part of low technology production which is typical for developing countries. For this reason, the primary purpose of the study was to identify a set of determinants responsible for the inhibition of accelerated technological change in the food industry in Poland. Analyses were performed basing on data from 415 companies included in the food production sector and the research methodology was based on probit modeling. / Synopsis. Przemysł spożywczy zaliczany jest do sektorów niskich technologii. Nie zmienia to faktu, że posiada on największy udział w produkcji przemysłowej w Polsce. Wynika to z faktu, że w gospodarce krajowej przeważająca część produkcji wytwarzana jest za pomocą niskich technologii, co jest typowe dla państw rozwijających się. Z tego powodu podstawowym celem prowadzonych badań było wskazanie zbioru determinant odpowiedzialnych za przyspieszanie i hamowanie zmian technologicznych w przemyśle spożywczym w Polsce. Analizy wykonano na bazie 415 przedsiębiorstw zaliczanych sektora produkcji żywności a metodyka badawcza była oparta na modelowaniu probitowym.
Three dimensional flux boundary conditions for soil covers
Creators: name: Weeks, Bjőrn
Publisher: name: University of British Columbia
Year: 2010

description: Soil covers are commonly used to isolate waste materials from the surrounding environment. The flux of moisture through a soil cover is one of the key parameters defining its performance. While the flux of moisture through soil covers has been well investigated for horizontal soil surfaces, there has been relatively little research on applications to sloped surfaces. This thesis examines moisture fluxes through soil covers in three dimensions, with a particular focus on the variations that occur in evaporation over a three dimensional (sloped) surface. A model for the prediction of net radiation over a three dimensional surface was developed, and verified with field experiments. Statistical analysis of the field data showed that the model could predict net radiation on sloped surfaces with good accuracy for engineering applications. A sensitivity study was also conducted to evaluate model parameters. The new model for net radiation over a three dimensional surface was designed for engineering application, and for simple integration with existing models of evaporation and flux boundaries on soil covers. The use of the new model, integrated with existing evaporative models, was demonstrated by comparison to field measured actual evaporation data. Applications have also been demonstrated for mapping net radiation and potential evaporation over three dimensional surfaces, with the mapping of actual evaporation also demonstrated for a case study meeting specific constraints.
Can we fit our nuclear PDFs with the high-$x$ CLAS data?
Creators: name: Paukkunen, Hannu
name: Zurita, Pia
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Nuclear parton distribution functions (nuclear PDFs) are non-perturbative objects that encode the partonic behaviour of bound nucleons. To avoid potential higher-twist contributions, the data probing the high-$x$ end of nuclear PDFs are sometimes left out from the global extractions despite their potential to constrain the fit parameters. In the present work we focus on the kinematic corner covered by the new high-$x$ data measured by the CLAS/JLab collaboration. By using the Hessian re-weighting technique, we are able to quantitatively test the compatibility of these data with globally analyzed nuclear PDFs and explore the expected impact on the valence-quark distributions at high $x$. We find that the data are in a good agreement with the EPPS16 and nCTEQ15 nuclear PDFs whereas they disagree with TuJu19. The implications on flavour separation, higher-twist contributions and models of EMC effect are discussed.
Focused-ion-beam-induced deposition of superconducting nanowires
Creators: name: Sadki, E. S.
name: Ooi, S.
name: Hirata, K.
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: Superconducting nanowires, with a critical temperature of 5.2 K, have been synthesized using an ion-beam-induced deposition, with a Gallium focused ion beam and Tungsten Carboxyl, W(CO)6, as precursor. The films are amorphous, with atomic concentrations of about 40, 40, and 20 % for W, C, and Ga, respectively. Zero Kelvin values of the upper critical field and coherence length of 9.5 T and 5.9 nm, respectively, are deduced from the resistivity data at different applied magnetic fields. The critical current density is Jc= 1.5 10^5 A/cm2 at 3 K. This technique can be used as a template-free fabrication method for superconducting devices.
description: Accepted for publication in Applied Physics Letters
Constraints on a quintessence model from gravitational lensing statistics
Creators: name: Sereno, M.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Constraints on an exact quintessence scalar-field model with an exponential potential are derived from gravitational lens statistics. An exponential potential can account for data from both optical quasar surveys and radio selected sources. Based on the Cosmic Lens All-Sky Survey (CLASS) sample, lensing statistics provides, for the pressureless matter density parameter, an estimate of Omega_{M0} = 0.31(-0.14)(+0.12).
description: 8 pages, 6 figures; this is a preprint of an Article accepted for publication in MNRAS
Polski eksport żywności do Rosji w warunkach globalnego kryzysu gospodarczego
Creators: name: Wierzejski, Tomasz
name: Wierzejski, Tomasz
Publisher: name: Unknown
Year: 2012
Subjects: subject: Agribusiness
subject: International Development
subject: International Relations/Trade
subject: agri-food sector
subject: exports
subject: economic crisis
subject: internationalization
subject: / sektor rolno-spożywczy
subject: eksport
subject: kryzys gospodarczy
subject: internacjonalizacja

description: Polish agri-food exports to Russia during the global economic crisis are analysed. The recession in Europe in 2009 and the debt crisis in the Eurozone were the key factors that had a negative influence on the international trade. The GDP decline in the European Union amounted to 4.2% and in Russia it was even stronger (7.8%). In spite of these disadvantages, Polish agri-food exports to Russia increased between 2007 and 2011 by 77% and the share of Russia in the Polish agri-food exports grew significantly, from 4.3% in 2008 to 5.3% in 2011. As a result, the internationalization of Polish agri-food sector sales is more diversified, at the cost of share of the EU-market. In the current complicated economic situation in the Eurozone, Russia with its population of 140 million can be a prospective, alternative exports market for Polish enterprises. / Synopsis. W artykule zaprezentowano analizę polskiego eksportu rolno-spożywczego do Rosji w czasie globalnego kryzysu gospodarczego. Recesja w Europie w 2009 r. oraz kryzys zadłużeniowy w strefie euro wyraźnie pogorszyły uwarunkowania handlu międzynarodowego. Spadek PKB w Unii Europejskiej wyniósł 4,2%, a w Rosji był jeszcze większy (7,8%). Pomimo tych niekorzystnych okoliczności polski eksport żywności do Rosji w latach 2007-2011 wzrósł o 77%, a udział Rosji w polskim eksporcie w tej grupie produktowej znaczą co zwiększył się, z 4,3% w 2008 r. do 5,3% w 2011 r. W efekcie internacjonalizacja sprzedaży z polskiego sektora rolno-spożywczego uległa dywersyfikacji, kosztem zmniejszenia udziału rynku unijnego. W obecnej, złożonej sytuacji ekonomicznej w strefie euro Rosja z około 140 milionową ludnością może okazać się perspektywicznym, alternatywnym rynkiem eksportowym dla polskich przedsiębiorstw.
A Common Origin for the QCD Axion and Sterile Neutrinos from $SU(5)$ Strong Dynamics
Creators: name: Cox, Peter
name: Gherghetta, Tony
name: Paul, Arpon
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We identify the QCD axion and right-handed (sterile) neutrinos as bound states of an $SU(5)$ chiral gauge theory with Peccei-Quinn (PQ) symmetry arising as a global symmetry of the strong dynamics. The strong dynamics is assumed to spontaneously break the PQ symmetry, producing a high-quality axion and naturally generating Majorana masses for the right-handed neutrinos at the PQ scale. The composite sterile neutrinos can directly couple to the left-handed (active) neutrinos, realizing a standard see-saw mechanism. Alternatively, the sterile neutrinos can couple to the active neutrinos via a naturally small mass mixing with additional elementary states, leading to light sterile neutrino eigenstates. The $SU(5)$ strong dynamics therefore provides a common origin for a high-quality QCD axion and sterile neutrinos.
description: 14 pages, 6 figures, v2: version published in JHEP
Additional file 1 of Unstably controlled systolic blood pressure trajectories are associated with markers for kidney damage in prediabetic population: results from the INDEED cohort study
Creators: name: Sun, Zi-Jun
name: Wang, Jin-Wei
name: Chang, Dong-Yuan
name: Shuo-Hua Chen
name: Zhang, Hui-Fen
name: Wu, Shou-Ling
name: He, Kevin
name: Zhang, Lu-Xia
name: Chen, Min
name: Zhao, Ming-Hui
Publisher: name: figshare
Year: 2020
Subjects: subject: Medicine
subject: Biotechnology
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Marine Biology

description: Additional file 1: Table S1. Linear regression analysis between SBP trajectory groups and indicators of kidney disease in 2016 among participants with two or more records of SBP. Table S2. Logistic regression analysis between SBP trajectory groups and abnormality for indicators of kidney disease in 2016 among participants with two or more records of SBP. Table S3. Concomitant therapies between SBP trajectory groups from 2006 to 2012.
Modeling flexoelectricity in soft dielectrics at finite deformation
Creators: name: Codony, David
name: Gupta, Prakhar
name: Marco, Onofre
name: Arias, Irene
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Numerical Analysis (math.NA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: This paper develops the equilibrium equations describing the flexoelectric effect in soft dielectrics under large deformations. Previous works have developed related theories using a flexoelectric coupling tensor of mixed material-spatial character. Here, we formulate the model in terms of a flexoelectric tensor completely defined in the material frame, with the same symmetries of the small-strain flexocoupling tensor and leading naturally to objective flexoelectric polarization fields. The energy potential and equilibrium equations are first expressed in terms of deformation and polarization, and then rewritten in terms of deformation and electric potential, yielding an unconstrained system of fourth order partial differential equations (PDEs). We further develop a theory of geometrically nonlinear extensible flexoelectric rods under open and closed circuit conditions, with which we examine analytically cantilever bending and buckling under mechanical and electrical actuation. Besides being a simple and explicit model pertinent to slender structures, this rod theory also allows us to test our general theory and its numerical implementation using B-splines. This numerical implementation is robust as it handles the electromechanical instabilities in soft flexoelectric materials.
description: typos corrected, references added
3D MODELLASHTIRISH TEXNOLOGIYASI ASOSIDA YO'L CHIZIQLARINI VIZUALLASHTIRISH
Creators: name: Bahromov, Asror Ahror o'g'li
name: Ibodullayev, Sardor Nasriddin o'g'li
Publisher: name: Zenodo
Year: 2025

description: Ushbu maqolada 3D modellashtirish texnologiyasi yordamida yo‘l chiziqlarini vizuallashtirish usullari ko‘rib chiqiladi. Ushbu texnologiya transport xavfsizligini oshirishda muhim ahamiyatga ega. Tadqiqot natijalari vizualizatsiya samaradorligini oshirish va aniq modellashtirish algoritmlarini ishlab chiqishda amaliy qo‘llanilishi mumkin.
Non-equilibrium evolution of quantum systems connected to multiple baths
Creators: name: Wu, Jinshan
Publisher: name: University of British Columbia
Year: 2010

description: In this thesis we develop a systematic formalism that allows the calculation of transport properties for small quantum systems coupled to multiple baths with different temperatures and/or chemical potentials. Our approach is based on a generalization of the projector operator technique, previously used to study the evolution towards equilibrium of systems weakly coupled to a single bath. Applying this technique to a system weakly coupled to multiple baths, we find a dynamical equation for the reduced density matrix of the system (the reduced density matrix is obtained by tracing out from the total density matrix the baths’ degrees of freedom). Integration of this dynamical equation gives the time evolution of the biased system. After a time interval long enough compared to the characteristic time-scales of the problem, the system arrives to a non-equilibrium steady-state. The density matrix in this non-equilibrium steady state can also be calculated directly, avoiding the time-integration of the dynamical equation. In the second part of the thesis we study non-equilibrium steady states and heat transport through short spin chains coupled to two thermal baths with different temperature. Two new definitions for the local temperature in nonequilibrium are proposed, based on local spin and energy at different sites. The definition based on the local energy seems to be more reliable. We find that for small biases, the heat and spin currents increase proportionally to the bias, however non-linear behavior is observed for large biases. The temperature profile of the chain depends strongly on the parameters of the system.
Stanowisko Unii Europejskiej w negocjacjach rolnych WTO i jego implikacje dla Wspólnej Polityki Rolnej
Creators: name: Wróbel, Anna
name: Wróbel, Anna
Publisher: name: Unknown
Year: 2012
Subjects: subject: Agribusiness
subject: Agricultural and Food Policy
subject: Environmental Economics and Policy
subject: Industrial Organization
subject: International Development
subject: International Relations/Trade
subject: agriculture
subject: trade liberalization
subject: European Union
subject: World Trade Organization
subject: / rolnictwo
subject: liberalizacja handlu
subject: Unia Europejska
subject: Światowa Organizacja Handlu

description: One of the major problems in the ongoing trade negotiations within the WTO is trade in agricultural products. In the case of the European Union, due to the significant level of protectionism in agriculture, an adoption of the WTO liberalization commitments in this area will mean a reform of the Common Agricultural Policy. At the moment, due to a lack of completion of the Doha negotiations round, it is difficult to predict trends in this policy. It is already generally recognized that the positive conclusion of the negotiations will increase the degree of opening of the EU market for agricultural products from third countries and reduce export subsidies. / Synopsis. Jednym z głównych problemów w ramach trwających obecnie negocjacji handlowych na forum Światowej Organizacji Handlu jest handel rolny. W przypadku Unii Europejskiej, z uwagi na znaczący poziom protekcjonizmu w rolnictwie, przyjęcie w ramach WTO zobowiązań liberalizujących wymianę w tym obszarze oznacza reformę wspólnej polityki rolnej. W chwili obecnej, z uwagi na brak zakończenia rokowań rundy Doha, trudno przewidzieć kierunki zmian w ramach tej polityki. Już teraz można jednak stwierdzić, iż pozytywne zakończenie rokowań przyczyni się do zwiększenia stopnia otwarcia rynku UE na produkty rolne z państw trzecich oraz do redukcji subsydiów eksportowych.
Wpływ integracji z Unią Europejską na działalność innowacyjną przedsiębiorstw przemysłu spożywczego w Polsce
Creators: name: Zakrzewska, Aneta
name: Zakrzewska, Aneta
Publisher: name: Unknown
Year: 2012
Subjects: subject: Agribusiness
subject: Agricultural and Food Policy
subject: Financial Economics
subject: Industrial Organization
subject: Research and Development/Tech Change/Emerging Technologies
subject: innovativeness
subject: innovation activity
subject: innovative enterprises
subject: food processing industry
subject: / innowacyjność
subject: działalność innowacyjna
subject: przedsiębiorstwa innowacyjne
subject: przemysł spożywczy

description: The paper presents an analysis of innovativeness in Polish food processing industry enterprises before and after the Polish integration into the European Union. Data published by the Central Statistical Office were used. The analysis proved that the integration into the European Union and the competitive and regulatory environment had an effect on innovation activities of enterprises. Despite a rising expenditure on innovations, producers of food products have not seized all opportunities of increasing the effectiveness of innovation activities undertaken. / Synopsis. W artykule przedstawiono analizę działalności innowacyjnej przedsiębiorstw przemysłu spożywczego przed i po przystąpieniu Polski do Unii Europejskiej. Wykorzystano w niej dane publikowane przez Główny Urząd Statystyczny. Przeprowadzona analiza wskazuje, że przystąpienie Polski do Unii Europejskiej i nowe otoczenie, nie tylko konkurencyjne ale i regulacyjne, wpłynęło na działalność innowacyjną przedsiębiorstw przemysłu spożywczego. Mimo rosnących nakładów na innowacje producenci żywności nie wykorzystali w pełni istniejących możliwości zwiększenia efektywności podejmowanej działalności innowacyjnej.
Can we explain cosmic birefringence without a new light field beyond Standard Model?
Creators: name: Nakai, Yuichiro
name: Namba, Ryo
name: Obata, Ippei
name: Qiu, Yu-Cheng
name: Saito, Ryo
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The recent analysis of the Planck 2018 polarization data shows a nonzero isotropic cosmic birefringence (ICB) that is not explained within the $Λ$CDM paradigm. We then explore the question of whether the nonzero ICB is interpreted by the framework of the Standard Model Effective Field Theory (SMEFT), or at the energy scales of the cosmic microwave background, the low-energy EFT (LEFT) whose dynamical degrees of freedom are five SM quarks and all neutral and charged leptons. Our systematic study reveals that any operator in the EFT on a cosmological background would not give the reported ICB angle, which is observationally consistent with frequency independence. In particular, we estimate the size of the ICB angle generated by the effect that the cosmic microwave background photons travel through the medium of the cosmic neutrino background with parity-violating neutrino-photon interactions and find that it would be too small to explain the data. If the reported ICB angle should be confirmed, then our result would indicate the existence of a new particle that is lighter than the electroweak scale and feebly interacting with the SM particles.
description: 13+14 pages in JHEP style, no figure: published version
Handel zagraniczny w przemyśle spożywczym Unii Europejskiej w latach 2005-2009
Creators: name: Żelazowska-Przewłoka, Anna
name: Żelazowska-Przewłoka, Anna
Publisher: name: Unknown
Year: 2012
Subjects: subject: Agribusiness
subject: Agricultural and Food Policy
subject: Industrial Organization
subject: International Relations/Trade
subject: food industry
subject: the European Union
subject: foreign trade
subject: import
subject: export
subject: / przemysł spożywczy
subject: Unia Europejska
subject: handel zagraniczny
subject: eksport

description: The food processing sector is one of the greatest and most important industry sectors in Europe. It is the second largest (after the metallurgical industry) in the manufacturing industry, with 14.5% of the industrial overall turnover (917 EUR billion) in the EU-27. Employment in the food processing industry constitutes 14% of employment in the entire industry sector. There are few European transnational companies competing worldwide with a great choice of products. Enterprises in the food sector are in 99% micro-, small and medium-sized enterprises (SMEs). The food industry is a branch of economy converting semi-finished products received from agriculture and fishery into foodstuffs (food and drinks). Belong to it not only all kinds of processing establishments producing meat and dairy products, processing fruit and vegetables, baking bread and producing alcoholic and non-alcoholic beverages, but also enterprises processing agricultural raw materials for the food industry such as dairy and sugar factories. Presentation of foreign trade in the food industry of the EU in 2005-2009 was the purpose of this article. / Synopsis. Przemysł spożywczy jest jednym z największych i najważniejszych sektorów przemysłowych w Europie. Jest drugi co do wielkości (za przemysłem metalowym) w przemyśle wytwórczym, z 14,5% całkowitego obrotu przemysłowego (917 bln euro dla UE-27). Zatrudnienie w przemyśle spożywczym stanowi 14% całego sektora przemysłowego. Jest niewiele europejskich wielonarodowych spółek konkurujących na całym świecie z wielkim wyborem produktów. Przedsiębiorstwa w sektorze spożywczym to w 99% mikro, małe i średnie przedsiębiorstwa (SMEs). Przemysł spożywczy jest gałęzią gospodarki przetwarzającą pół produkty dostarczone przez rolnictwo i rybołówstwo w artykuły żywnościowe (żywność i napoje). Należą do niego nie tylko wszelkiego rodzaju zakłady przetwórcze produkujące wyroby mięsne i mleczne, przetwarzające owoce i warzywa, prowadzące wypiek pieczywa oraz produkujące napoje alkoholowe i bezalkoholowe, lecz również przedsiębiorstwa zajmujące się przetwórstwem produktów rolnych do postaci surowców dla przemysłu spożywczego, jak np. młyny lub cukrownie. Celem opracowania było przedstawienie handlu zagranicznego w przemyśle spożywczym Unii Europejskiej w latach 2005-2009.
Wybrane determinanty rozwoju innowacyjnych powiązań integracyjnych w agrobiznesie w dobie globalizacji
Creators: name: Chorób, Roman
name: Chorób, Roman
Publisher: name: Unknown
Year: 2012
Subjects: subject: Agribusiness
subject: Agricultural and Food Policy
subject: Community/Rural/Urban Development
subject: integration processes
subject: innovation
subject: agribusiness
subject: globalization
subject: / procesy integracyjne
subject: innowacje
subject: agrobiznes
subject: globalizacja

description: The primary objective of this paper is to present theoretical foundations, principles of operation and benefits resulting from efficiently functioning innovative integration relations such as cluster structures. This study attempts to assess the impact of above-mentioned forms of relations on the regional and local development, as well as to indicate the conditions for development of these relations in the ongoing globalization processes. / Synopsis. Podstawowym celem niniejszego opracowania jest prezentacja teoretycznych podstaw, zasad funkcjonowania oraz korzyści płynących z efektywnie funkcjonujących innowacyjnych powiązań integracyjnych, jakimi są struktury klastrowe. W opracowaniu podjęto próbę oceny wpływu w/w form powiązań na rozwój regionalny i lokalny, jak też próbę wskazania uwarunkowań rozwoju tych związków w obliczu zachodzących procesów globalizacji.
Is X(3872) a possible candidate of hybrid meson
Creators: name: Li, Bing An
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The associate productions of X(3872) and J/ψin hadron collisions and flavor independence of hadrons in ee^+\to X(3872)+hadrons and the decays X(3872)\to γ+hadrons are discussed. It is pointed out X(3872)\to J/ψ+σcould be a significant decay channel.
description: 13 pages
Fast Data-independent KLT Approximations Based on Integer Functions
Creators: name: Radünz, A. P.
name: Coelho, D. F. G.
name: Bayer, F. M.
name: Cintra, R. J.
name: Madanayake, A.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Signal Processing (eess.SP)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Numerical Analysis (math.NA)
subject: Image and Video Processing (eess.IV)
subject: Methodology (stat.ME)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: The Karhunen-Loève transform (KLT) stands as a well-established discrete transform, demonstrating optimal characteristics in data decorrelation and dimensionality reduction. Its ability to condense energy compression into a select few main components has rendered it instrumental in various applications within image compression frameworks. However, computing the KLT depends on the covariance matrix of the input data, which makes it difficult to develop fast algorithms for its implementation. Approximations for the KLT, utilizing specific rounding functions, have been introduced to reduce its computational complexity. Therefore, our paper introduces a category of low-complexity, data-independent KLT approximations, employing a range of round-off functions. The design methodology of the approximate transform is defined for any block-length $N$, but emphasis is given to transforms of $N = 8$ due to its wide use in image and video compression. The proposed transforms perform well when compared to the exact KLT and approximations considering classical performance measures. For particular scenarios, our proposed transforms demonstrated superior performance when compared to KLT approximations documented in the literature. We also developed fast algorithms for the proposed transforms, further reducing the arithmetic cost associated with their implementation. Evaluation of field programmable gate array (FPGA) hardware implementation metrics was conducted. Practical applications in image encoding showed the relevance of the proposed transforms. In fact, we showed that one of the proposed transforms outperformed the exact KLT given certain compression ratios.
description: 19 pages, 10 figures, 7 tables
On branches of the KS black hole
Creators: name: Buchel, Alex
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The Klebanov-Strassler black hole is a holographic dual to ${\cal N}=1$ supersymmetric $SU(N)\times SU(N+M)$ cascading gauge theory plasma with spontaneously broken chiral symmetry. The chiral symmetry breaking sector of the cascading gauge theory contains two dimension-3 operators and a single dimension-7 operator. The black hole solution constructed in arXiv:1809.08484 represents the end point of the instability triggered by the condensation of one of the dimension-3 operators. We study here all three branches of the quasinormal modes of the chiral symmetry breaking sector -- there are no additional instabilities beyond the one identified in arXiv:1012.2404. Thus, the Klebanov-Strassler black hole solution of arXiv:1809.08484 is the only one with homogeneous and isotropic horizon, perturbatively connected to the chirally symmetric Klebanov-Tseytlin black hole arXiv:0706.1768.
description: 27 pages, 5 figures; v2: NPB version
Polski eksport produktów rolno-spożywczych do Rosji
Creators: name: Cieślewicz, Wiesława
name: Cieślewicz, Wiesława
Publisher: name: Unknown
Year: 2012
Subjects: subject: Agribusiness
subject: International Relations/Trade
subject: export
subject: agro-food products
subject: Russia
subject: / eksport
subject: produkty rolno-spożywcze
subject: Rosja

description: Poland is conducting a vivid trade in agro-food products with Russia. The paper presents an analysis of exports of these products in 2004-2010. The basic material for analysis were data from the Central Statistical Office publications. Also, the scientific literature has proved to be helpful. The collected data were processed with methods of descriptive and time series analysis and on that basis by methods of logical inference. In the period investigated, the value of Polish exports of agro-food products to Russia has increased from USD 501,4 million to 992,5 million, so by 98,0%. Despite such a large increase in the trade value, its meaning for the Polish trade in food products was low. In 2010 exports of agro-food products to Russia amounted to 5,5% of total exports. The structure of exports was dominated by a few groups of products. These were products of horticulture, fruit and vegetable processing industry, cocoa and cocoa preparations, dairy products, and miscellaneous edible preparations. / Synopsis. Polska prowadzi ożywioną wymianą handlową produktami rolno-spożywczymi z Rosją. W artykule dokonano analizy eksportu tych produktów w latach 2004–2010. Podstawowy materiał do analizy stanowiły dane Głównego Urzędu Statystycznego. Pomocne okazało się również piśmiennictwo naukowe. Zebrane informacje opracowano posługując się metodą opisową szeregów czasowych, a na ich podstawie logicznego wnioskowania. W badanym okresie nastąpił wzrost wartości polskiego eksportu produktów rolno-spożywczych do Rosji z 501,4 do 992,5 mln USD, a więc o 98,0%. Mimo tak dużego wzrostu wartości tego eksportu, w 2010 roku eksport artykułów rolno-spożywczych do Rosji stanowił 5,5% całości wywozu do tego kraju. W strukturze eksportu dominowało kilka grup produktów. Były to produkty ogrodnictwa i przemysłu owocowo-warzywnego, kakao i przetwory, produkty mleczarskie oraz różne przetwory spożywcze.