cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Studying Critical Parameters of Superconductor via Diamond Quantum Sensors
Creators: name: Ho, Kin On
name: Leung, Wai Kuen
name: Pang, Yiu Yung
name: Yip, King Yau
name: Xie, Jianyu
name: Liu, Yi Man
name: Rotelli, Aliki Sofia
name: Leung, Man Yin
name: Chow, Ho Yin
name: Lai, Kwing To
name: Denisenko, Andrej
name: Keimer, B.
name: Wrachtrup, Jörg
name: Yang, Sen
Publisher: name: arXiv
Year: 2024
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Critical parameters are the key to superconductivity research, and reliable instrumentations can facilitate the study. Traditionally, one has to use several different measurement techniques to measure critical parameters separately. In this work, we develop the use of a single species of quantum sensor to determine and estimate several critical parameters with the help of independent simulation data. We utilize the nitrogen-vacancy (NV) center in the diamond, which recently emerged as a promising candidate for probing exotic features in condensed matter physics. The non-invasive and highly stable nature provides extraordinary opportunities to solve scientific problems in various systems. Using a high-quality single-crystalline YBa$_{2}$Cu$_{4}$O$_{8}$ (YBCO) as a platform, we demonstrate the use of diamond particles and a bulk diamond to probe the Meissner effect. The evolution of the vector magnetic field, the $H-T$ phase diagram, and the map of fluorescence contour are studied via NV sensing. Our results reveal different critical parameters, including lower critical field $H_{c1}$, upper critical field $H_{c2}$, and critical current density $j_{c}$, as well as verifying the unconventional nature of this high-temperature superconductor YBCO. Therefore, NV-based quantum sensing techniques have huge potential in condensed matter research.
Chaos of Yang-Mills Field in Class A Bianchi Spacetimes
Creators: name: Jin, Yoshida
name: Maeda, Kei-ichi
Publisher: name: arXiv
Year: 2004
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: Studying Yang-Mills field and gravitational field in class A Bianchi spacetimes, we find that chaotic behavior appears in the late phase (the asymptotic future). In this phase, the Yang-Mills field behaves as that in Minkowski spacetime, in which we can understand it by a potential picture, except for the types VIII and IX. At the same time, in the initial phase (near the initial singularity), we numerically find that the behavior seems to approach the Kasner solution. However, we show that the Kasner circle is unstable and the Kasner solution is not an attractor. From an analysis of stability and numerical simulation, we find a Mixmaster-like behavior in Bianchi I spacetime. Although this result may provide a counterexample to the BKL (Belinskii, Khalatnikov and Lifshitz) conjecture, we show that the BKL conjecture is still valid in Bianchi IX spacetime. We also analyze a multiplicative effect of two types of chaos, that is, chaos with the Yang-Mills field and that in vacuum Bianchi IX spacetime. Two types of chaos seem to coexist in the initial phase. However, the effect due to the Yang-Mills field is much smaller than that of the curvature term.
description: 15 pages, 8 figures
Two-dimensional critical systems with mixed boundary conditions: Exact Ising results from conformal invariance and boundary-operator expansions
Creators: name: Burkhardt, T. W.
name: Eisenriegler, E.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: With conformal-invariance methods, Burkhardt, Guim, and Xue studied the critical Ising model, defined on the upper half plane $y>0$ with different boundary conditions $a$ and $b$ on the negative and positive $x$ axes. For $ab=-+$ and $f+$, they determined the one and two-point averages of the spin $σ$ and energy $ε$. Here $+$, $-$, and $f$ stand for spin-up, spin-down, and free-spin boundaries, respectively. The case $+-+-+\dots$, where the boundary conditions switch between $+$ and $-$ at arbitrary points, $ζ_1$, $ζ_2$, $\dots$ on the $x$ axis was also analyzed. In this paper the alternating boundary conditions $+f+f+\dots$ and the case $-f+$ of three different boundary conditions are considered. Exact results for the one and two-point averages of $σ$, $ε$, and the stress tensor $T$ are derived. Using the results for $\langle T\rangle$, the critical Casimir interaction with the boundary of a wedge-shaped inclusion is analyzed for mixed boundary conditions. The paper also includes a comprehensive discussion of boundary-operator expansions in two-dimensional critical systems with mixed boundary conditions. Two types of expansions - away from switching points of the boundary condition and at switching points - are considered. The asymptotic behavior of two-point averages is expressed in terms of one-point averages with the help of the expansions. We also consider the strip geometry with mixed boundary conditions and derive the distant-wall corrections to one-point averages near one edge due to the other edge using the boundary-operator expansions. The predictions of the boundary-operator expansions are consistent with exact results for Ising systems.
description: 50 pages, 1 figure
Tackling the Problem of Distributional Shifts: Correcting Misspecified, High-Dimensional Data-Driven Priors for Inverse Problems
Creators: name: Barco, Gabriel Missael
name: Adam, Alexandre
name: Stone, Connor
name: Hezaveh, Yashar
name: Perreault-Levasseur, Laurence
Publisher: name: arXiv
Year: 2024
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Machine Learning (cs.LG)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Bayesian inference for inverse problems hinges critically on the choice of priors. In the absence of specific prior information, population-level distributions can serve as effective priors for parameters of interest. With the advent of machine learning, the use of data-driven population-level distributions (encoded, e.g., in a trained deep neural network) as priors is emerging as an appealing alternative to simple parametric priors in a variety of inverse problems. However, in many astrophysical applications, it is often difficult or even impossible to acquire independent and identically distributed samples from the underlying data-generating process of interest to train these models. In these cases, corrupted data or a surrogate, e.g. a simulator, is often used to produce training samples, meaning that there is a risk of obtaining misspecified priors. This, in turn, can bias the inferred posteriors in ways that are difficult to quantify, which limits the potential applicability of these models in real-world scenarios. In this work, we propose addressing this issue by iteratively updating the population-level distributions by retraining the model with posterior samples from different sets of observations, and we showcase the potential of this method on the problem of background image reconstruction in strong gravitational lensing when score-based models are used as data-driven priors. We show that, starting from a misspecified prior distribution, the updated distribution becomes progressively closer to the underlying population-level distribution, and the resulting posterior samples exhibit reduced bias after several updates.
description: 20 pages, 15 figures. To be published in The Astrophysical Journal. Added and updated references; fixed typos; extended discussions in some sections. Results unchanged
Классификация аэропортов по уровням шума и разработка шумозащитных мероприятий
Creators: name: М.В. Буторина
Publisher: name: figshare
Year: 2020
Subjects: subject: 91301 Acoustics and Noise Control (excl. Architectural Acoustics)
subject: FOS: Mechanical engineering

description: Результаты картирования шума на территории Санкт-Петербурга показывают, что под влиянием шума аэропорта Пулково находится порядка трети городских территорий. Авиационный шум является наиболее раздражительным по сравнению с другими видами шума, что вызывает увеличение количества жалоб со стороны населения. В настоящее время на территории РФ действует методика по оценке уровней шума аэропортов на основании максимальных уровней звука, создаваемых самолетами российского производства, разработанная на основании эмпирических данных, относящихся к 1980-м годам прошлого века. На основании технических параметров аэропортов разработана классификация аэропортов по эквивалентным уровням звука, которая может являться основанием для разработки карт шума авиатранспорта. На основании предложенной классификации рекомендованы шумозащитные мероприятия для аэропортов различных категорий.
Detecting winding and Chern numbers in topological matter using spectral function
Creators: name: Estake, Kiran Babasaheb
name: Roy, Dibyendu
Publisher: name: arXiv
Year: 2024
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We propose a method to directly probe bulk topological quantum numbers in topological matter by measuring the momentum-space single-particle spectral function (SPSF). Angle-resolved photoemission spectroscopy (ARPES) can detect SPSF and is often used to determine the bulk band structure of quantum materials. Here, we show that while one part of the momentum-space SPSF gives band structure, it also contains the knowledge of winding and Chern numbers of various topological materials. For this, we derive SPSF in different models of topological systems, such as the Kitaev model of topological superconductors, the long-range Su-Schrieffer-Heeger model, the Qi-Wu-Zhang model, the Haldane model on a hexagonal lattice and a four-band model that is a physical realization of the Kitaev chain and explain how to extract the winding or Chern numbers in different topological phases from the SPSF. Such information from SPSF seems experimentally accessible due to the recent advancement of ARPES and scanning tunneling spectroscopy techniques. While the detection of bulk topological quantum numbers using the SPSF works well for one-dimensional systems, it has certain limitations for higher-dimensional systems, where it must be complementary with another measurement to ensure the matter under investigation is topological, i.e., having a non-zero Chern number.
description: 15 pages, 11 figures
United States – European Union Agricultural Trade Flows
Creators: name: Dahl, Ellie
name: House, Lisa
name: Dahl, Ellie
name: House, Lisa
Publisher: name: Unknown
Year: 2008
Subjects: Agribusiness
Agricultural and Food Policy
Farm Management
Food Consumption/Nutrition/Food Safety
Industrial Organization

description: Population growth and general economic performance drives global demand for food and agricultural products, which lays the foundation for trade and U.S. exports (ERS a). Through the effects on employment, purchasing power and income, agricultural exports play a significant role in both the farm and nonfarm economy (Edmonson). In 2006, each export farm dollar earned generated an additional $1.65 in business activity in 2006 (Edmondson). As a result, the $71.0 billion earned in agricultural exports stimulated an additional $117.2 billion in general economic activity in 2006 (Edmondson). Over the past five years, values of agricultural exports from the U.S. have been on the rise hitting record levels (Brooks). Increased demand in Canada and Mexico are primarily responsible for the renewed growth within agricultural exports (Brooks). Figure 1-1 shows all major agricultural products being exported from the U.S. over the past five years. The largest area of agricultural exports from the U.S. has consistently been cereal products. These types of products include major cereals such as barley, millet, and oat, as well as pseudo cereals that include buckwheat, amaranth and quinoa (Seibel). These products currently compose 23% of total U.S. agricultural exports and have traditionally been the largest export product(ERS a).
Emergent symmetries in prethermal phases of periodically driven quantum systems
Creators: name: Banerjee, Tista
name: Sengupta, K.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Periodically driven closed quantum systems are expected to eventually heat up to infinite temperature reaching a steady state described by a circular orthogonal ensemble (COE). However, such finite driven systems may exhibit sufficiently long prethermal regimes; their properties in these regimes are qualitatively different from that in their infinite temperature steady states. These, often experimentally relevant, prethermal regimes host a wide range of phenomena; they may exhibit dynamical localization and freezing, host Floquet scars, display signatures of Hilbert space fragmentation, and exhibit time crystalline phases. Such phenomena are often accompanied by emergent approximate dynamical symmetries which have no analogue in equilibrium systems. In this review, we provide a pedagogical introduction to the origin and nature of these symmetries and discuss their role in shaping the prethermal phases of a class of periodically driven closed quantum systems.
description: Invited review article to be submitted to JPCM: v2 with added references and stylistic changes to text
Dark Initial State Radiation and the Kinetic Mixing Portal
Creators: name: Rizzo, Thomas G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Data from Planck measurements of the cosmic microwave background (CMB) place important constraints on models with light dark matter (DM) and light mediators especially when both lie in the mass range below $\sim 1 $ GeV. In models involving kinetic mixing where the dark photon acts as the mediator, these constraints are easily satisfied and the appropriate DM relic density achievable if the DM is, e.g., a complex scalar, where $p$-wave annihilation occurs, or is the lighter component of a split pseudo-Dirac state where co-annihilation dominates. In both of these cases, although higher order in the dark gauge coupling, $g_D$, the corresponding annihilation processes including dark photon initial state radiation (ISR) will be dominantly $s$-wave with essentially temperature independent cross sections. The rates for these dark ISR associated processes, though not yielding cross sections large enough to contribute to the relic density, can still run into possible conflicts with the bounds arising from the CMB. In this paper we perform a preliminary study of the present and potential future constraints that the CMB imposes on the parameter spaces for both of these scenarios due to the existence of this dark ISR. Further analyses of the effects of dark ISR in DM annihilation is clearly warranted.
description: 19 pages, 7 figs; Reference added, minor text changes
Measurement of the H/A -> tau tau cross section and possible constraints on tan beta
Creators: name: Kinnunen, R.
name: Lehti, S.
name: Moortgat, F.
name: Nikitenko, A.
name: Spira, M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The achievable precision of the cross section times branching ratio measurement from the event rates is estimated for the MSSM H/A -> tau tau decay in the associated production process gg -> b bbar H/A at large tan beta in CMS. This work demonstrates that the above production and decay process exhibit a large sensitivity to tan beta and thus add as a significant observable to a global fit of the SUSY parameters. To illustrate this potential an example is given concerning the achievable tan beta determination accuracy that could be reached from the event rates and for a given set of SUSY parameters and uncertainties.
Machine learning surrogates for efficient hydrologic modeling: Insights from stochastic simulations of managed aquifer recharge
Creators: name: Dai, Timothy
name: Maher, Kate
name: Perzan, Zach
Publisher: name: arXiv
Year: 2024
Subjects: subject: Geophysics (physics.geo-ph)
subject: Machine Learning (cs.LG)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Process-based hydrologic models are invaluable tools for understanding the terrestrial water cycle and addressing modern water resources problems. However, many hydrologic models are computationally expensive and, depending on the resolution and scale, simulations can take on the order of hours to days to complete. While techniques such as uncertainty quantification and optimization have become valuable tools for supporting management decisions, these analyses typically require hundreds of model simulations, which are too computationally expensive to perform with a process-based hydrologic model. To address this gap, we assess a hybrid modeling workflow in which a process-based model is used to generate an initial set of simulations and a machine learning (ML) surrogate model is then trained to perform the remaining simulations required for downstream analysis. As a case study, we apply this workflow to simulations of variably saturated groundwater flow at a prospective managed aquifer recharge site. We compare the accuracy and computational efficiency of several ML architectures, including deep convolutional networks, recurrent neural networks, vision transformers, and networks with Fourier transforms. Our results demonstrate that ML surrogate models can achieve under 10% mean absolute percentage error and yield order-of-magnitude runtime savings over process-based models. Building on these findings, we examine the impacts of key modeling choices on surrogate model accuracy and efficiency. Results show that a normalized loss function improves training stability, while min-max data normalization can significantly reduce error up to a factor of 10 when compared to other treatments such as Z-score and no normalization. Downsampling input features using an autoencoder also decreases memory requirements by training with tensors 4% their original size. By reducing computational costs and...
description: 32 pages, 14 figures, 11 tables; updated to accepted manuscript
Аэроакустика промышленной аэродинамической трубы АТ-11: методика измерения инфразвуковых пульсаций давления
Creators: name: А.И. Цветков
Publisher: name: figshare
Year: 2020
Subjects: subject: 91301 Acoustics and Noise Control (excl. Architectural Acoustics)
subject: FOS: Mechanical engineering

description: Интерес к исследованию аэроакустики промышленных аэродинамических труб объясняется высокими требованиями по снижению шума в открытой рабочей части и в рабочих каналах аэродинамических труб. В данной работе рассматривается методика измерения инфразвуковых пульсаций давления в аэродинамической трубе АТ-11 СПбГУ и проводится сравнение подходов к измерению таких пульсаций для труб АТ-11 и Т-103 ЦАГИ.
The Financial Value of Champagne Houses in a Cobweb Economy
Creators: name: Declerck, Francis
name: Cloutier, L. Martin
name: Declerck, Francis
name: Cloutier, L. Martin
Publisher: name: Unknown
Year: 2008
Subjects: subject: Agribusiness
subject: Agricultural and Food Policy
subject: Farm Management
subject: Food Consumption/Nutrition/Food Safety
subject: Industrial Organization
subject: financial valuation
subject: vertical coordination
subject: cobweb economy
subject: system dynamics
subject: price expectations
subject: Champagne
subject: wine

description: The objective of the paper is to simulate the corporate value of Champagne makers by taking into account the Champagne market evolution. These measurements are conducted by linking financial debt, performance and valuation to a vertical coordination model of production-consumption within a cobweb economy. The overall model uses the dynamic structure that underlies the strategic interactions amongst grape producers and wine makers. These segments coordinate grape production and trade by forming expectations about final consumption, price and stock risks. The paper examines the dynamics of the financial cash flows and net worth of Champagne houses for the 1977 – 2003 period using system dynamics (SD) modeling principles. The results presented in this paper report on key financial indicators for that period for financial debt, performance and valuation of Champagne makers. It provides a sound basis to pursue this work, because the model can further enhanced to anticipate the possible value Champagne makers for the coming crucial years since the Champagne appellation has reached its geographical limit determined by the protected designation of origin (PDO), while worldwide demand continues to grow.
Zero Shot Health Trajectory Prediction Using Transformer
Creators: name: Renc, Pawel
name: Jia, Yugang
name: Samir, Anthony E.
name: Was, Jaroslaw
name: Li, Quanzheng
name: Bates, David W.
name: Sitek, Arkadiusz
Publisher: name: arXiv
Year: 2024
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: Integrating modern machine learning and clinical decision-making has great promise for mitigating healthcare's increasing cost and complexity. We introduce the Enhanced Transformer for Health Outcome Simulation (ETHOS), a novel application of the transformer deep-learning architecture for analyzing high-dimensional, heterogeneous, and episodic health data. ETHOS is trained using Patient Health Timelines (PHTs)-detailed, tokenized records of health events-to predict future health trajectories, leveraging a zero-shot learning approach. ETHOS represents a significant advancement in foundation model development for healthcare analytics, eliminating the need for labeled data and model fine-tuning. Its ability to simulate various treatment pathways and consider patient-specific factors positions ETHOS as a tool for care optimization and addressing biases in healthcare delivery. Future developments will expand ETHOS' capabilities to incorporate a wider range of data types and data sources. Our work demonstrates a pathway toward accelerated AI development and deployment in healthcare.
The homotopy fixed point sets of spheres actions on rational complexes
Creators: name: Hao, Yanlong
name: Liu, Xiugui
name: Sun, Qianwen
Publisher: name: arXiv
Year: 2022
Subjects: subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics
subject: 55R91, 55R45

description: In this paper, we describe the homotopy type of the homotopy fixed point sets of $S^3$-actions on rational spheres and complex projective spaces, and provide some properties of $S^1$-actions on a general rational complex.
Product Roadmap Alignment Extended references
Creators: name: Stefan Trieflinger, Jürgen Münch
Publisher: name: figshare
Year: 2020
Subjects: subject: 150302 Business Information Systems
subject: FOS: Economics and business

description: List of the extended references of the paper "Product Roadmap Alignment – Achieving the Vision Together: A Grey Literature Review by Stefan Trieflinger, Jürgen Münch, Emre Bogazköy, Patrick Eißler, Jan Schneider and Bastian Roling
IceHEP High Energy Physics at the South Pole
Creators: name: Anchordoqui, Luis
name: Halzen, Francis
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: With the solar and SN87 neutrino observations as proofs of concepts, the kilometer-scale neutrino experiment IceCube will scrutinize its data for new particle physics. In this paper we review the prospects for the realization of such a program. We begin with a short overview of the detector response and discuss the reach of ``beam'' luminosity. After that we discuss the potential of IceCube to probe deviations of neutrino-nucleon cross sections from the Standard Model predictions at center-of-mass energies well beyond those accessible in man-made accelerators. Then we review the prospects for extremely long-baseline analyses and discuss the sensitivity to measure tiny deviations of the flavor mixing angle, expected to be induced by quantum gravity effects. Finally we discuss the potential to uncover annihilation of dark matter particles gravitationally trapped at the center of the Sun, as well as processes occurring in the early Universe at energies close to the Grand Unification scale.
description: Typos corrected and references added. Version with high resolution figures available at http://www.hep.physics.neu.edu/staff/doqui/icehep_rev6.ps
The Host Galaxy of the Dwarf Seyfert UGC 06728
Creators: name: Bentz, Misty C.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present multi-color high-resolution imaging of the host galaxy of the dwarf Seyfert UGC 06728. As the lowest-mass black hole to be described with both a direct mass constraint and a spin constraint, UGC 06728 is an important source for comparison with black hole evolutionary models, yet little is known about the host galaxy. Using Hubble Space Telescope imaging in the optical and near-infrared, we find that UGC 06728 is a barred lenticular (SB0) galaxy with prominent ansae at the ends of the bar. We cleanly separated the AGN from the resolved galaxy with two-dimensional image decompositions, thus allowing accurate surface brightness profiles to be derived in all filters from the outer edge of the galaxy all the way into the nucleus. Based on a sample of 51 globular cluster candidates identified in the images, the globular cluster luminosity function predicts a distance to UCG 06728 of $32.5\pm3.5$ Mpc. Combining the galaxy photometry with the distance estimate, we derive a starlight-corrected AGN luminosity, the absolute magnitude of the galaxy, and a constraint on the galaxy stellar mass of $\log M_{\star}/M_{\odot}=9.9\pm0.2$.
description: Accepted for publication in ApJ; 7 pages, 5 figures and 4 tables. V2 includes edits after refereeing
Relaxation Fluctuations of Correlation Functions: Spin and Random Matrix Models
Creators: name: Pathak, Tanay
Publisher: name: arXiv
Year: 2024
Subjects: subject: Quantum Physics (quant-ph)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Spectral statistics and correlations are the usual way to study the presence or absence of quantum chaos in quantum systems. We present our investigation on the study of the fluctuation average and variance of certain correlation functions as a diagnostic measure of quantum chaos and to possibly characterize quantum systems based on it. These quantities are related to eigenvector distribution and eigenvector correlation. Using the Random Matrix Theory certain analytical expressions of these quantities, for the Gaussian orthogonal ensemble case, were calculated before. So as a first step, we study these quantities for the Gaussian unitary ensemble case numerically, and deduce certain analytical results for the same. We then carry out our investigations in physical system, such as the mixed-field Ising model. For this model, we find that although the eigenvalue statistics follow the behaviour of corresponding random matrices, the fluctuation average and variance of these correlation functions deviate from the expected random matrix theory behaviour. We then turn our focus on the Rosenzweig-Porter model of the Gaussian Orthogonal Ensemble and Gaussian Unitary Ensemble types. By using the fluctuation average and variance of these correlations, we identify the three distinct phases of these models: the ergodic, the fractal, and the localized phases. We provide an alternative way to study and distinguish the three phases and firmly establish the use of these correlation fluctuations as an alternative way to characterize quantum chaos.
description: Published version
Henrique Vieira Filho - Arte Brasileira Na Contemporaneidade
Creators: name: FILHO, HENRIQUE VIEIRA
Publisher: name: Zenodo
Year: 2021
Subjects: arte

description: Arte Brasileira Na Contemporaneidade Brazilian Art In The Contemporaneity Vol. II - Capítulo: Henrique Vieira Filho - págs. 108 a 111 ISBN: 978-85-5649-006-3 Realização e Curadoria: Carmen Elisabeth Pousada Edição bilingue: português/inglês - 2017 Ornitorrinco Editora - São Paulo - SP - Brasil
Absolute negative conductivity and zero-resistance states in two dimensional electron systems: A plausible scenario
Creators: name: Ryzhii, V.
name: Chaplik, A.
name: Suris, R.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present a model which provides a plausible explanation of the effect of zero-resistance and zero-conductance states in two-dimensional electron systems subjected to a magnetic field and irradiated with microwaves observed in a number of experiments and of the effect main features. The model is based on the concept of absolute negative conductivity associated with photon-assisted scattering of electrons on impurities. It is shown that the main features of the effect can be attributed to the interplay of different electron scattering mechanisms.
description: 4 pages, 2 figures, to be published in JETP Letters
Study on the atmospheric pressure homogeneous discharge in air assisted with a floating carbon fibre microelectrode
Creators: name: Zhao, Shuai
name: Hao, Yong
name: Qiao, Tao
name: Cui, Weisheng
Publisher: name: arXiv
Year: 2020
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Based on the consideration of increasing the number of initial electrons and providing an appropriate distribution of electric field strength for discharge space, a method of adopting the wire-cylindrical type electrode structure with a floating carbon fibre electrode to achieve atmospheric pressure homogeneous discharge (APHD) in air is proposed in this paper. Studies of the electrode characteristics show that this structure can make full use of the microdischarge process of the carbon fibre microelectrode and the good discharge effect of the helical electrode to provide plenty of initial electrons for the discharge space. Besides, the non-uniform electric field distribution with gradual change is conducive to the slow growth of electron avalanches in this structure. Thus, the initial discharge voltage can be reduced and the formation of filamentary discharge channels can be inhibited, which provides theoretical possibilities for the homogeneous discharge in atmospheric air. Experiments show that a three-dimensional uniform discharge phenomenon can be realized under a 6.0 kV applied voltage in a PFA tube of 6 mm inner diameter, displaying good uniformity and large scale.
description: 7 pages,7 figures
Observation results by the TAMA300 detector on gravitational wave bursts from stellar-core collapses
Creators: name: Ando, Masaki
name: Arai, Koji
name: Aso, Youichi
name: Beyersdorf, Peter
name: Hayama, Kazuhiro
name: Iida, Yukiyoshi
name: Kanda, Nobuyuki
name: Kawamura, Seiji
name: Kondo, Kazuhiro
name: Mio, Norikatsu
name: Miyoki, Shinji
name: Moriwaki, Shigenori
name: Nagano, Shigeo
name: Numata, Kenji
name: Sato, Shuichi
name: Somiya, Kentaro
name: Tagoshi, Hideyuki
name: Takahashi, Hirotaka
name: Takahashi, Ryutaro
name: Tatsumi, Daisuke
name: Tsunesada, Yoshiki
name: Zhu, Zong-Hong
Publisher: name: arXiv
Year: 2004
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present data-analysis schemes and results of observations with the TAMA300 gravitational-wave detector, targeting burst signals from stellar-core collapse events. In analyses for burst gravitational waves, the detection and fake-reduction schemes are different from well-investigated ones for a chirp-wave analysis, because precise waveform templates are not available. We used an excess-power filter for the extraction of gravitational-wave candidates, and developed two methods for the reduction of fake events caused by non-stationary noises of the detector. These analysis schemes were applied to real data from the TAMA300 interferometric gravitational wave detector. As a result, fake events were reduced by a factor of about 1000 in the best cases. The resultant event candidates were interpreted from an astronomical viewpoint. We set an upper limit of 2.2x10^3 events/sec on the burst gravitational-wave event rate in our Galaxy with a confidence level of 90%. This work sets a milestone and prospects on the search for burst gravitational waves, by establishing an analysis scheme for the observation data from an interferometric gravitational wave detector.
The Role of Inter-Organizational Leadership in Agri-Food Value Chains
Creators: name: Dooley, Lawrence B.
name: Luca, E.
name: Dooley, Lawrence B.
name: Luca, E.
Publisher: name: Unknown
Year: 2008
Subjects: Agribusiness
Agricultural and Food Policy
Farm Management
Food Consumption/Nutrition/Food Safety
Industrial Organization

description: For many years research on marketing channel behaviour was focused on power and conflict between channel members. More recently, as a result of globalisation, firms have become more dependent on each other and more collaborative models of channel behaviour have developed to meet the demands of the global marketplace. Research suggests that closer relationships involving trust, commitment, co-operation, co-ordination, and collaboration are needed between chain members to ensure the success of their value chains. The major challenge is to identify and develop leadership styles that foster efficient and collaborative value chains. Generally, the literature suggests that supply chain effectiveness and survival is linked to leadership behaviour. Leader behaviour has needed to adapt to the competitive global environment, which tends to focus on fostering inter-organisational co-operation rather than competing in an adversarial way. In this climate, leaders need to possess supply chain management skills and, perhaps more critically, the ability to establish and maintain effective inter-organisational networks. Early exploratory research in manufacturing suggested that a participatory leadership style is most effective in fostering co-operation and increased supply chain performance.
Understanding death, suicide and self-injury among adherents of the emo youth subculture: A qualitative study
Creators: name: Trnka, Radek
name: Kuska, Martin
name: Balcar, Karel
name: Tavel, Peter
Publisher: name: figshare
Year: 2020
Subjects: subject: Developmental and Educational Psychology
subject: 170102 Developmental Psychology and Ageing
subject: FOS: Psychology
subject: 130205 Humanities and Social Sciences Curriculum and Pedagogy (excl. Economics, Business and Management)
subject: FOS: Educational sciences
subject: 160801 Applied Sociology, Program Evaluation and Social Impact Assessment
subject: FOS: Sociology
subject: 170113 Social and Community Psychology
subject: 160403 Social and Cultural Geography
subject: FOS: Social and economic geography
subject: Personality, Social and Criminal Psychology
subject: 160104 Social and Cultural Anthropology
subject: 160512 Social Policy
subject: FOS: Political science
subject: 220316 Philosophy of Specific Cultures (incl. Comparative Philosophy)
subject: FOS: Philosophy, ethics and religion
subject: 190104 Visual Cultures
subject: FOS: Arts (arts, history of arts, performing arts, music)
subject: 200212 Screen and Media Culture
subject: FOS: Other humanities
subject: 200206 Globalisation and Culture
subject: 200204 Cultural Theory
subject: 200299 Cultural Studies not elsewhere classified

description: Emo youth subculture bases its subcultural identification mostly on symbols of death, dying, suicide and other kinds of morbid content. The main goal of the present study was to explore attitudes toward suicidal behaviour and self-injury in emo adolescents. Semistructured in-depth qualitative interviews were conducted with 14 emo adherents, accompanied by an analysis of emo Web discussion forums. The results show a subculture-specific display of rules, i.e. norms of how one should express emotions. These unusual display rules enabled emo community members to express any actual emotional experience in public spaces without any inhibition. Emo participants reported that the main philosophy of the emo subculture is “to experience and express actual emotions without any restraint”. Furthermore, participants reported attitudes that included high acceptance of suicidal behaviour and self-injury. The escalation of strong emotions, for example, strong depression in the form of suicide, was perceived as something quite common in emo communities. Identification with the emo youth subculture is considered to be a factor strengthening vulnerability towards risky behaviours.
EFT Approach of Inelastic Dark Matter for Xenon Electron Recoil Detection
Creators: name: He, Hong-Jian
name: Wang, Yu-Chen
name: Zheng, Jiaming
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Measuring dark matter (DM) signals via electron recoil provides an important means for direct detection of light DM particles. The recent XENON1T anomaly with electron recoil energy around $\,E_R^{}\!=\!(2-3)$keV can be naturally explained by DM inelastic scattering which injects energy to the recoiled electrons and gives a narrow peak structure in the recoil spectrum. We present an effective field theory (EFT) approach to exothermic inelastic DM signals for the Xenon electron recoil detection. For relatively heavy mediator, we fairly formulate the DM-lepton interactions by effective contact operators with two DM fields $(X,\,X')$ and two leptons. Using the XENON1T data, we fit the electron recoil spectrum and constrain the allowed scalar DM mass-splitting as $\,2.1\,\text{keV}\!
description: JCAP Final Version, 27 pages, only minor refinements, typos corrected and references added
A Provisional Framework for Studying Information Connectivity in Food Networks
Creators: name: Engelseth, Per
name: Karlsen, Anniken
name: Engelseth, Per
name: Karlsen, Anniken
Publisher: name: Unknown
Year: 2008
Subjects: subject: Agribusiness
subject: Agricultural and Food Policy
subject: Farm Management
subject: Food Consumption/Nutrition/Food Safety
subject: Industrial Organization
subject: Food chains and networks
subject: Complete chain and network approach
subject: Information connectivity
subject: Enterprise modelling
subject: Product traceability

description: Through a discussion of peculiarities of food supply, involving focus on information connectivity, a preliminary framework is sought that underlines joint responsibility in a complete supply chain of actors working in network context to achieve safe, quality and economic provision of products to end-use.
Simulating Monolithic Active Pixel Sensors: A Technology-Independent Approach Using Generic Doping Profiles
Creators: name: Wennlöf, Håkan
name: Dannheim, Dominik
name: Viera, Manuel Del Rio
name: Dort, Katharina
name: Eckstein, Doris
name: Feindt, Finn
name: Gregor, Ingrid-Maria
name: Huth, Lennart
name: Lachnit, Stephan
name: Mendes, Larissa
name: Rastorguev, Daniil
name: Daza, Sara Ruiz
name: Schütze, Paul
name: Simancas, Adriana
name: Snoeys, Walter
name: Spannagel, Simon
name: Stanitzki, Marcel
name: Tomal, Alessandra
name: Velyka, Anastasiia
name: Vignola, Gianpiero
Publisher: name: arXiv
Year: 2024
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: The optimisation of the sensitive region of CMOS sensors with complex non-uniform electric fields requires precise simulations, and this can be achieved by a combination of electrostatic field simulations and Monte Carlo methods. This paper presents the guiding principles of such simulations, using a CMOS pixel sensor with a small collection electrode and a high-resistivity epitaxial layer as an example. The full simulation workflow is described, along with possible pitfalls and how to avoid them. For commercial CMOS processes, detailed doping profiles are confidential, but the presented method provides an optimisation tool that is sufficiently accurate to investigate sensor behaviour and trade-offs of different sensor designs without knowledge of proprietary information.
 The workflow starts with detailed electric field finite element method simulations in TCAD, using generic doping profiles. Examples of the effect of varying different parameters of the simulated sensor are shown, as well as the creation of weighting fields, and transient pulse simulations. The fields resulting from TCAD simulations can be imported into the Allpix Squared Monte Carlo simulation framework, which enables high-statistics simulations, including modelling of stochastic fluctuations from the underlying physics processes of particle interaction. Example Monte Carlo simulation setups are presented and the different parts of a simulation chain are described.
 Simulation studies from small collection electrode CMOS sensors are presented, and example results are shown for both single sensors and multiple sensors in a test beam telescope configuration. The studies shown are those typically performed on sensor prototypes in test beam campaigns, and a comparison is made to test beam data, showing a maximum deviation of 4% and demonstrating that the approach is viable for generating realistic results.
description: 22 pages, 25 figures, submitted to Nuclear Instruments and Methods in Physics Research, Section A
Axial Symmetry and Rotation in the SiO Maser Shell of IK Tauri
Creators: name: Boboltz, D. A.
name: Diamond, P. J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We observed v=1, J=1-0 43-GHz SiO maser emission toward the Mira variable IK Tauri (IK Tau) using the Very Long Baseline Array (VLBA). The images resulting from these observations show that SiO masers form a highly elliptical ring of emission approximately 58 x 32 mas with an axial ratio of 1.8:1. The major axis of this elliptical distribution is oriented at position angle of ~59 deg. The line-of-sight velocity structure of the SiO masers has an apparent axis of symmetry consistent with the elongation axis of the maser distribution. Relative to the assumed stellar velocity of 35 km/s, the blue- and red-shifted masers were found to lie to the northwest and southeast of this symmetry axis respectively. This velocity structure suggests a NW-SE rotation of the SiO maser shell with an equatorial velocity, which we determine to be ~3.6 km/s. Such a NW-SE rotation is in agreement with a circumstellar envelope geometry invoked to explain previous water and OH maser observations. In this geometry, water and OH masers are preferentially created in a region of enhanced density along the NE-SW equator orthogonal to the rotation/polar axis suggested by the SiO maser velocities.
description: 17 Pages, 4 figures (2 color); accepted for publication in ApJ
Chain Management: All about Success
Creators: name: Gagalyuk, Taras
name: Hanf, Jon Henrich
name: Gagalyuk, Taras
name: Hanf, Jon Henrich
Publisher: name: Unknown
Year: 2008
Subjects: subject: Agribusiness
subject: Agricultural and Food Policy
subject: Farm Management
subject: Food Consumption/Nutrition/Food Safety
subject: Industrial Organization
subject: Chain management
subject: Network goals
subject: Success

description: Nowadays food products are produced in vertically collaborating networks. The questions of how such chain networks have to be designed and which governance structure fits best have been addressed in several well known articles. However, questions dealing with chain strategy and management are not discussed satisfyingly. Neither is the understanding of what is success of chain management distinguished.
Probing gravity and growth of structure with gravitational waves and galaxies' peculiar velocity
Creators: name: Palmese, Antonella
name: Kim, Alex G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The low-redshift velocity field is a unique probe of the growth of cosmic structure and gravity. We propose to use distances from gravitational wave (GW) detections, in conjunction with the redshifts of their host galaxies from wide field spectroscopic surveys (e.g. DESI, 4MOST, TAIPAN), to measure peculiar motions within the local Universe. Such measurement has the potential to constrain the growth rate $fσ_8$ and test gravity through determination of the gravitational growth index $γ$, complementing constraints from other peculiar velocity measurements. We find that binary neutron star mergers with associated counterpart at $z\lesssim 0.2$ that will be detected by the Einstein Telescope (ET) will be able to constrain $fσ_8$ to $\sim 3\%$ precision after $10$ years of operations when combined with galaxy overdensities from DESI and TAIPAN. If a larger network of third generation GW detectors is available (e.g. including the Cosmic Explorer), the same constraints can be reached over a shorter timescale ($\sim 5$ years for a 3 detectors network). The same events (plus information from their hosts' redshifts) can constrain $γ$ to $σ_γ\lesssim 0.04$. This constraint is precise enough to discern General Relativity from other popular gravity models at $3σ$. This constraint is improved to $σ_γ\sim 0.02-0.03$ when combined with galaxy overdensities. The potential of combining galaxies' peculiar velocities with gravitational wave detections for cosmology highlights the need for extensive optical to near--infrared follow--up of nearby gravitational wave events, or exquisite GW localization, in the next decade.
description: 12 pages, 3 Figures