cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Matrix product solution for a partially asymmetric 1D lattice gas with a free defect
Creators: name: Lobaskin, Ivan
name: Evans, Martin R
name: Mallick, Kirone
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A one-dimensional, driven lattice gas with a freely moving, driven defect particle is studied. Although the dynamics of the defect are simply biased diffusion, it disrupts the local density of the gas, creating nontrivial nonequilibrium steady states. The phase diagram is derived using mean field theory and comprises three phases. In two phases, the defect causes small localized perturbations in the density profile. In the third, it creates a shock, with two regions at different bulk densities. When the hopping rates satisfy a particular condition (that the products of the rates of the gas and defect are equal), it is found that the steady state can be solved exactly using a two-dimensional matrix product ansatz. This is used to derive the phase diagram for that case exactly and obtain exact asymptotic and finite size expressions for the density profiles and currents in all phases. In particular, the front width in the shock phase on a system of size $L$ is found to scale as $L^{1/2}$, which is not predicted by mean field theory. The results are found to agree well with Monte Carlo simulations.
description: 20 pages, 5 figures
Charging Peter to pay Paul : accounting for the financial effects of user charges
Creators: name: Evans, Robert G., 1942-
name: Barer, M. L.
name: Stoddart, G. L.
Publisher: name: Centre for Health Services and Policy Research (CHSPR)
Year: 2014

description: This is one in a series of articles by the authors about the ongoing debate over user charges in the Canadian health care system. In this paper we outline a formal and comprehensive analytic framework in which income transfers - the principal effects of user charges - can be traced between groups in the population (e.g. the healthy and the sick, the rich and the poor), between payers and health care providers, and among providers. The accounting relationships in this framework, expressed as equatins, are a sub-set of those underlying the economy-wide national income and product accounts. They make it clear that "it is impossible to do only one thing" when charges are imposed -- or removed. The framework is used to analyze the patterns of income transfers associated with different types of user charges.
Ab-initio calculation of point defect equilibria during heat treatment: Nitrogen, hydrogen, and silicon doped diamond
Creators: name: Mansoor, Mubashir
name: Mansoor, Mehya
name: Mansoor, Maryam
name: Aksoy, Ammar
name: Seyhan, Sinem Nergiz
name: Yildirim, Betul
name: Tahiri, Ahmet
name: Solak, Nuri
name: Kazmanli, Kursat
name: Er, Zuhal
name: Czelej, Kamil
name: Urgen, Mustafa
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Point defects are responsible for a wide range of optoelectronic properties in materials, making it crucial to engineer their concentrations for novel materials design. However, considering the plethora of defects in co-doped semiconducting and dielectric materials and the dependence of defect formation energies on heat treatment parameters, process design based on an experimental trial and error approach is not an efficient strategy. This makes it necessary to explore computational pathways for predicting defect equilibria during heat treatments. The accumulated experimental knowledge on defect transformations in diamond is unparalleled. Therefore, diamond is an excellent material for benchmarking computational approaches. By considering nitrogen, hydrogen, and silicon doped diamond as a model system, we have investigated the pressure dependence of defect formation energies and calculated the defect equilibria during heat treatment of diamond through ab-initio calculations. We have plotted monolithic-Kröger-Vink diagrams for various defects, representing defect concentrations based on process parameters, such as temperature and partial pressure of gases used during heat treatments of diamond. The method demonstrated predicts the majority of experimental data, such as nitrogen aggregation path leading towards the formation of the B center, annealing of the B, H3, N3, and NVHx centers at ultra high temperatures, the thermal stability of the SiV center, and temperature dependence of NV concentration. We demonstrate the possibility of designing heat treatments for a wide range of semiconducting and dielectric materials by using a relatively inexpensive yet robust first principles approach, significantly accelerating defect engineering and high-throughput novel materials design.
description: This preprint includes 17 pages, 1 cover photo, 7 figures and 2 appendices
Zarządzanie ryzykiem w tworzeniu wartości przedsiębiorstwa na przykładzie firmy z sektora: leśnictwo i pozyskiwanie drewna
Creators: name: Stefańczyk, Magdalena
Publisher: name: figshare
Year: 2013
Subjects: Economics

description: The following report will be presented risk management strategy in creating value for companies in the sector example: forestry and logging. The calculations for the current asset financing strategies, investment in current assets and net working capital management allow to select the best options for the analyzed company, while maximizing profit.
Depth induces scale-averaging in overparameterized linear Bayesian neural networks
Creators: name: Zavatone-Veth, Jacob A.
name: Pehlevan, Cengiz
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Inference in deep Bayesian neural networks is only fully understood in the infinite-width limit, where the posterior flexibility afforded by increased depth washes out and the posterior predictive collapses to a shallow Gaussian process. Here, we interpret finite deep linear Bayesian neural networks as data-dependent scale mixtures of Gaussian process predictors across output channels. We leverage this observation to study representation learning in these networks, allowing us to connect limiting results obtained in previous studies within a unified framework. In total, these results advance our analytical understanding of how depth affects inference in a simple class of Bayesian neural networks.
description: 8 pages, no figures
IN03217 Alavala-Amuna Rock Inscription
Creators: name: Paranavitana, S.
Publisher: name: Zenodo
Year: 2020
Subjects: IN03217
UoC
Alavala-Amuna

description: IN03217 Alavala-Amuna Rock Inscription - Transcript and Translation Source: Paranavitana, S. (1960). ‘Lankatilaka Inscriptions,’ University of Ceylon Review 18, nos. 1&2, pp. 1–45. http://dlib.pdn.ac.lk/handle/123456789/1366
3D UNet - arabidopsis - ZeroCostDL4Mic
Creators: name: DeepImageJ
name: ZeroCostDL4Mic
Publisher: name: Zenodo
Year: 2021
Subjects: bioimage.io
bioimage.io:model
zerocostdl4mic
deepimagej
segmentation
3dunet

description: Download RDF Package
Visit https://github.com/HenriquesLab/ZeroCostDL4Mic/wiki
description: Trained 3D U-Net to segment arabidopsis ovaries boundaries in confocal microscopy 3D volumes. (Uploaded via https://bioimage.io)
Efficient Product Formulas for Commutators and Applications to Quantum Simulation
Creators: name: Chen, Yu-An
name: Childs, Andrew M.
name: Hafezi, Mohammad
name: Jiang, Zhang
name: Kim, Hwanmun
name: Xu, Yijia
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We construct product formulas for exponentials of commutators and explore their applications. First, we directly construct a third-order product formula with six exponentials by solving polynomial equations obtained using the operator differential method. We then derive higher-order product formulas recursively from the third-order formula. We improve over previous recursive constructions, reducing the number of gates required to achieve the same accuracy. In addition, we demonstrate that the constituent linear terms in the commutator can be included at no extra cost. As an application, we show how to use the product formulas in a digital protocol for counterdiabatic driving, which increases the fidelity for quantum state preparation. We also discuss applications to quantum simulation of one-dimensional fermion chains with nearest- and next-nearest-neighbor hopping terms, and two-dimensional fractional quantum Hall phases.
description: 18 pages, 11 figures
A GREAT model comparison against the cosmological constant
Creators: name: Arjona, Rubén
name: Espinosa-Portales, Llorenc
name: García-Bellido, Juan
name: Nesseris, Savvas
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Recently, a covariant formulation of non-equilibrium phenomena in the context of General Relativity was proposed in order to explain from first principles the observed accelerated expansion of the Universe, without the need for a cosmological constant, leading to the GREA theory. Here, we confront the GREA theory against the latest cosmological data, including type Ia supernovae, baryon acoustic oscillations, the cosmic microwave background (CMB) radiation, Hubble rate data from the cosmic chronometers and the recent $H_0$ measurements. We perform Markov Chain Monte Carlo analyses and a Bayesian model comparison, by estimating the evidence via thermodynamic integration, and find that when all the aforementioned data are included, but no prior on $H_0$, the difference in the log-evidence is $\sim -9$ in favor of GREA, thus resulting in overwhelming support for the latter over the cosmological constant and cold dark matter model ($Λ$CDM). When we also include priors on $H_0$, either from Cepheids or the Tip of the Red Giant Branch measurements, then due to the tensions with CMB data the GREA theory is found to be statistically equivalent with $Λ$CDM.
description: 11 pages, 4 figures, 6 tables. Changes match published version
Outlier Detection for Trajectories via Flow-embeddings
Creators: name: Frantzen, Florian
name: Seby, Jean-Baptiste
name: Schaub, Michael T.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Social and Information Networks (cs.SI)
subject: Algebraic Topology (math.AT)
subject: Physics and Society (physics.soc-ph)
subject: Applications (stat.AP)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We propose a method to detect outliers in empirically observed trajectories on a discrete or discretized manifold modeled by a simplicial complex. Our approach is similar to spectral embeddings such as diffusion-maps and Laplacian eigenmaps, that construct vertex embeddings from the eigenvectors of the graph Laplacian associated with low eigenvalues. Here we consider trajectories as edge-flow vectors defined on a simplicial complex, a higher-order generalization of graphs, and use the Hodge 1-Laplacian of the simplicial complex to derive embeddings of these edge-flows. By projecting trajectory vectors onto the eigenspace of the Hodge 1-Laplacian associated to small eigenvalues, we can characterize the behavior of the trajectories relative to the homology of the complex, which corresponds to holes in the underlying space. This enables us to classify trajectories based on simply interpretable, low-dimensional statistics. We show how this technique can single out trajectories that behave (topologically) different compared to typical trajectories, and illustrate the performance of our approach with both synthetic and empirical data.
description: 5 pages, 5 figures, code available
The dimensional evolution of structure and dynamics in hard sphere liquids
Creators: name: Charbonneau, Patrick
name: Hu, Yi
name: Kundu, Joyjit
name: Morse, Peter K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The formulation of the mean-field, infinite-dimensional solution of hard sphere glasses is a significant milestone for theoretical physics. How relevant this description might be for understanding low-dimensional glass-forming liquids, however, remains unclear. These liquids indeed exhibit a complex interplay between structure and dynamics, and the importance of this interplay might only slowly diminish as dimension $d$ increases. A careful numerical assessment of the matter has long been hindered by the exponential increase of computational costs with $d$. By revisiting a once common simulation technique involving the use of periodic boundary conditions modeled on $D_d$ lattices, we here partly sidestep this difficulty, thus allowing the study of hard sphere liquids up to $d=13$. Parallel efforts by Mangeat and Zamponi [Phys. Rev. E 93, 012609 (2016)] have expanded the mean-field description of glasses to finite $d$ by leveraging standard liquid-state theory, and thus help bridge the gap from the other direction. The relatively smooth evolution of both structure and dynamics across the $d$ gap allows us to relate the two approaches, and to identify some of the missing features that a finite-$d$ theory of glasses might hope to include to achieve near quantitative agreement.
description: 11 pages, 8 figures
Zarzadzanie_ryzykiem_w_tworzeniu_wartosci_przedsiebiorstwa_na_przykladzie_przedsiebiorstwa_z_branzy_papierniczej_M.Kochanek
Creators: name: Kochanek, Marcin
Publisher: name: figshare
Year: 2013
Subjects: Economics
Education

description: Purpose of this work is to manage enterprise risk by analyzing possible scenarios.
Gauge structure of the Einstein field equations in Bondi-like coordinates
Creators: name: Giannakopoulos, Thanasis
name: Bishop, Nigel T.
name: Hilditch, David
name: Pollney, Denis
name: Zilhao, Miguel
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The characteristic initial (boundary) value problem has numerous applications in general relativity (GR) involving numerical studies, and is often formulated using Bondi-like coordinates. Recently it was shown that several prototype formulations of this type are only weakly hyperbolic. Presently we examine the root cause of this result. In a linear analysis we identify the gauge, constraint and physical blocks in the principal part of the Einstein field equations in such a gauge, and show that the subsystem related to the gauge variables is only weakly hyperbolic. Weak hyperbolicity of the full system follows as a consequence in many cases. We demonstrate this explicitly in specific examples, and thus argue that Bondi-like gauges result in weakly hyperbolic free evolution systems under quite general conditions. Consequently the characteristic initial (boundary) value problem of GR in these gauges is rendered ill-posed in the simplest norms one would like to employ. The possibility of finding good alternative norms, in which well-posedness is achieved, is discussed. So motivated, we present numerical convergence tests with an implementation of full GR which demonstrate the effect of weak hyperbolicity in practice.
description: 23 pages, 3 figures, ancillary files, data and more supplemental material at 10.5281/zenodo.5618007, updated to match published version
New physics in triboson event topologies
Creators: name: Carpenter, Linda M.
name: Smylie, Matthew J.
name: Ramirez, Jesus Manuel Caridad
name: McDowell, Cameron
name: Whiteson, Daniel
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a study of the sensitivity to models of new physics of proton collisions resulting in three electroweak bosons. As a benchmark, we analyze models in which an exotic scalar field $ϕ$ is produced in association with a gauge boson ($V=γ$ or $Z$). The scalar then decays to a pair of bosons, giving the process $pp\rightarrow ϕV\rightarrow V'V"V$. We interpret our results in a set of effective field theories where the exotic scalar fields couple to the Standard Model through pairs of electroweak gauge bosons. We estimate the sensitivity of the LHC and HL-LHC datasets and find sensitivity to cross sections in the 10 fb -- 0.5 fb range, corresponding to scalar masses of 500 GeV to 2 TeV and effective operator coefficients up to 35 TeV.
description: 21 pages, 13 figures. Updated to match the version of record
Google Scholar
Creators: name: , Grahl
name: , Herold
Publisher: name: Zenodo
Year: 2022
Subjects: Google Scholar
Alert

description: Das Handout stellt die Recherche mit der akademischen Suchmaschine Google Scholar vor. Dabei wird insbesondere die Suche mit der erweiterten Suche, die Weiterarbeit in der Trefferliste, das Einrichten von Alters und Bibliothekslinks sowie Suche nach frei verfügbaren Titeln veranschaulicht.
Zarządzanie wartością na przykładzie przedsiębiorstwa z branży tekstylnej
Creators: name: Szlachetka, Dawid
Publisher: name: figshare
Year: 2013
Subjects: Economics

description: Niniejsze opracowanie przedstawia metodologię oraz praktyczne przykłady z zakresu zarządzania wartością przedsiębiorstwa, bazując na sprawozdaniach finansowych firmy z branży tekstylnej. Praca koncentruje się na ocenie projektów inwestycyjnych w przedsiębiorstwie.
Supplementary document for Strong coupling of double excitons with guided mode resonances and quasi-bound states in the continuum in heterogeneous metamaterials - 7121204.pdf
Creators: name: Li, Junjie
name: Tang, Yu
name: Cheng, Yang
name: Cai, Shijie
name: Liu, Xiaoshan
name: Chen, Jing
name: Fu, Guolan
name: Liu, Zhengqi
name: Pan, pingping
name: Liu, Guiqiang
Publisher: name: Optica Publishing Group
Year: 2024
Subjects: Uncategorized

description: Supplement 1
BioExcel Webinar #18 - Multiple timescales in atomistic simulations
Creators: name: Meloni, Simone
Publisher: name: Zenodo
Year: 2017
Subjects: webinar

description: Rare events are processes that occur on time-scales longer than those currently accessible by brute force simulations, i.e. at most microseconds in classical molecular dynamics and up to (one or few) hundreds of picoseconds in ab initio simulations. Interesting processes in many fields are rare events: chemical reactions, conformational changes in biomolecules, and nucleation phenomena are just a few examples. These processes are usually described as transitions among states corresponding to local minima of the free energy surface of the system (metastable states). When metastable states are separated by free energy barriers, much higher than the thermal energy of the system, the dynamics is consists in persistent motion in the basin of attraction of one of the minima and rapid, but very infrequent, transitions to the other minima. Thus, the system is characterized by disparate timescales: the timescale of atomistic dynamics (femtoseconds) and the timescale of the infrequent jumps between metastable states. In this talk, Simone will introduce a theoretical framework to describe these processes and a set of methods to investigate them. In particular, the focus will be on cases in which a limited set of order parameter is insufficient to describe the initial, final and intermediate states of the process, i.e. problems which cannot be addressed by standard techniques, such as umbrella sampling and thermodynamics integration. The use of these techniques will be illustrated with examples in several fields of condensed (soft, liquid and solid) matter, showing that they allow to treat cases requiring up to thousands of collective variables.
Understanding the Impact of Semi-numeric Reionization Models when using CNNs
Creators: name: Zhou, Yihao
name: La Plante, Paul
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Interpreting 21cm measurements from current and upcoming experiments like HERA and the SKA will provide new scientific insights and exciting implications for astrophysics and cosmology regarding the Epoch of Reionization (EoR). Several recent works have proposed using machine learning methods, such as convolutions neural networks (CNNs), to analyze images of reionization generated by these experiments since they could take full advantage of information contained in the image. Generally, these studies have used only a single semi-numeric method to generate the input 21cm data. In this work, we investigate the extent to which training CNNs for reionization applications depends on the underlying semi-numeric models. Working in the context of predicting CMB optical depth from 21cm images, we compare networks trained on similar datasets from 21cmfast and zreion, two widely used semi-numeric reionization methods. We show that neural networks trained on input data from only one model produce poor predictions on data from the other model. Satisfactory results are only achieved when both models are included in the training data. This finding has important implications for future analyses on observation data, and encourages the use of multiple models to produce images that capture the full complexity of the EoR.
description: 33 pages, 18 figures
Canadian Literature and English Studies in the Canadian University
Creators: name: Fee, Margery
Publisher: name: Essays on Canadian Writing
Year: 2009

description: English Studies began in Canada in 1884 at Dalhousie University; Canadian literature was first taught at the post-secondary level in 1907 at the Ontario Agricultural College in Guelph. Arnoldian humanism dominated the outlook of early professors of English in Canada. Their feeling that Canadian literature was not among "the best" explains why so few courses appeared in Canadian universities, despite nationalist pressure from students. About 5-10% of courses then were devoted to Canadian literature in the English curriculum and this (except in Quebec) remains the case today.
„Zarządzanie ryzykiem w tworzeniu wartości na przykładzie przedsiębiorstwa z branży produkcja wyrobów tekstylnych”
Creators: name: Raróg, Maciej
Publisher: name: figshare
Year: 2013
Subjects: Economics

description: Poniższa praca przedstawia sposoby zarządzania wartością i ryzykiem przedsiębiorstwa z branży produkcja wyrobów tekstylnych. Autor pracy pragnie przedstawić metodę doboru optymalnej struktury finansowania aktywów bieżących korzystając z dostępnych danych finansowych w postaci sprawozdań finansowych przedsiębiorstwa.
Zarządzanie ryzykiem w tworzeniu wartości na przykładzie przedsiębiorstwa z branży produkcji galanterii skórzanej.
Creators: name: Kucharski, Mateusz
Publisher: name: figshare
Year: 2013
Subjects: Economics

description: Sporządzony na podstawie przedsiębiorstwa produkującego galanterie skórzaną raport przedstawia metodę ograniczania ryzyka walutowego z wykorzystaniem kontraktów terminowych CFD. Dane zostały wykorzystane ze sprawozdań finansowych jak również informacji cechujących branże oraz kontrakty CFD.
Orbital Dynamics in Centrosymmetric Systems
Creators: name: Han, Seungyun
name: Lee, Hyun-Woo
name: Kim, Kyoung-Whan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Orbital dynamics in time-reversal-symmetric centrosymmetric systems is examined theoretically. Contrary to common belief, we demonstrate that many aspects of orbital dynamics are qualitatively different from spin dynamics because the algebraic properties of the orbital and spin angular momentum operators are different. This difference generates interesting orbital responses, which do not have spin counterparts. For instance, the orbital angular momentum expectation values may oscillate even without breaking neither the time-reversal nor the inversion symmetry. Our quantum Boltzmann approach reproduces the previous result on the orbital Hall effect and reveals additional orbital dynamics phenomena, whose detection schemes are discussed briefly. Our work will be useful for the experimental differentiation of the orbital dynamics from the spin dynamics.
description: 6+4 pages, 4 figures
Observation of degenerate zero-energy topological states at disclinations in an acoustic lattice
Creators: name: Deng, Yuanchen
name: Benalcazar, Wladimir A.
name: Chen, Ze-Guo
name: Oudich, Mourad
name: Ma, Guancong
name: Jing, Yun
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Building upon the bulk-boundary correspondence in topological phases of matter, disclinations have recently been harnessed to trap fractionally quantized density of states (DoS) in classical wave systems. While these fractional DoS have associated states localized to the disclination's core, such states are not protected from deconfinement due to the breaking of chiral symmetry, generally leading to resonances which, even in principle, have finite lifetimes and suboptimal confinement. Here, we devise and experimentally validate in acoustic lattices a paradigm by which topological states bind to disclinations without a fractional DoS but which preserve chiral symmetry. The preservation of chiral symmetry pins the states at the mid-gap, resulting in their protected maximal confinement. The integer DoS at the defect results in two-fold degenerate states that, due to symmetry constraints, do not gap out. Our study provides a fresh perspective on the interplay between symmetry-protection in topological phases and topological defects, with possible applications in classical and quantum systems alike.
Commercial whaling : the issues reconsidered
Creators: name: Pitcher, Tony J.
name: Chuenpagdee, Ratana
Publisher: name: Fisheries Centre. University of British Columbia
Year: 2014

description: Director's Foreword.- Organizer's Introduction.- Management Procedures for Commercial Whaling Workshop.- List of Participants.- Contribution Papers: Whaling: Past, Present and Future Kjartan (G. Magnusson).- A Logical Analysis of Whaling Issues (Tony J. Pitcher).- Overview of the Revised Management Procedure (Andre Punt).- The Resumption of Whaling Question: The Greenpeace Perspective (Catherine Stewart).- Fisheries Centre Workshop Series.
Dynamic Exploitation Gaussian Bare-Bones Bat Algorithm for Optimal Reactive Power Dispatch to Improve the Safety and Stability of Power System
Creators: name: Qu, Zhaoyang
name: Dong, Yunchang
name: Mugemanyi, Sylvère
name: Yu, Tong
name: Bo, Xiaoyong
name: Li, Huashun
name: Li, Yang
name: Rugema, François Xavier
name: Bananeza, Christophe
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: Optimization and Control (math.OC)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Mathematics

description: In this paper, a novel Gaussian bare-bones bat algorithm (GBBBA) and its modified version named as dynamic exploitation Gaussian bare-bones bat algorithm (DeGBBBA) are proposed for solving optimal reactive power dispatch (ORPD) problem. The optimal reactive power dispatch (ORPD) plays a fundamental role in ensuring stable, secure, reliable as well as economical operation of the power system. The ORPD problem is formulated as a complex and nonlinear optimization problem of mixed integers including both discrete and continuous control variables. Bat algorithm (BA) is one of the most popular metaheuristic algorithms which mimics the echolocation of the microbats and which has also outperformed some other metaheuristic algorithms in solving various optimization problems. Nevertheless, the standard BA may fail to balance exploration and exploitation for some optimization problems and hence it may often fall into local optima. The proposed GBBBA employs the Gaussian distribution in updating the bat positions in an effort to mitigate the premature convergence problem associated with the standard BA. The GBBBA takes advantages of Gaussian sampling which begins from exploration and continues to exploitation. DeGBBBA is an advanced variant of GBBBA in which a modified Gaussian distribution is introduced so as to allow the dynamic adaptation of exploitation and exploitation in the proposed algorithm. Both GBBBA and DeGBBBA are used to determine the optimal settings of generator bus voltages, tap setting transformers and shunt reactive sources in order to minimize the active power loss, total voltage deviations and voltage stability index. Simulation results show that GBBBA and DeGBBBA are robust and effective in solving the ORPD problem.
description: Accepted by IET Renewable Power Generation
Tolman IV fluid sphere in f(R, T) gravity
Creators: name: Bhar, Piyali
name: Rej, Pramit
name: Zubair, M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this article, we studied the behavior of relativistic spherical objects considering Tolman IV spacetime in modified $f(R,\,T)$ gravity for the uncharged perfect fluid matter. We have chosen the matter Lagrangian as $\mathcal{L}_m=-p$ to develop our present model. In particular, for this investigation we have reported for the compact object LMC $X-4$ [Mass=$(1.04 \pm 0.09)M_{\odot}$; Radius= $8.301_{-0.2}^{+0.2}$ Km] in our paper. The effect of the coupling parameter $β$ on the local matter distribution of compact stars has been investigated in this paper. It can be seen that with greater values of $β$, the sound speed and adiabatic index are higher. On contrary, the mass function takes lower value for higher values of $β$. Our obtained solution does not admit singularities in the matter density, pressure and metric functions. According to our graphical analysis, this new stellar model satisfies all physical requirements anticipated in a realistic star.
description: 13 pages, 8 figures; Accepted in Chinese Journal of Physics on 19 November 2021; Available online 5 December 2021
Numerical study of effects of electrode parameters and image charge on the electric field configuration of RPCs
Creators: name: Dey, Tanay
name: Mukhopadhyay, Supratik
name: Chattopadhyay, Subhasis
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: The working of a resistive plate chamber depends on the electric field applied inside the gas gap. The strength of this electric field inside the gas gap depends on parameters like electrode thickness, permittivity, gas gap, among others. The applied electric field can get significantly modified by space charge effect. This can be a major concern while working in high rate particle physics experiments. Accumulation of space charge generated due to consecutive avalanches can distort the applied field. During this investigation, we have observed that the strength of this perturbation in electric field is a function of the amount of charge, electrode thickness, permittivity, and gas gap. In this paper, we have studied the dependence of the applied field on parameters linked to RPC fabrication, mentioned above. In addition, we have used the method of image to calculate the additional polarisation field due to space charge for a basic five layers of the geometry of an RPC. The variation of the perturbation in electric field with the same three parameters electrode thickness, permittivity, gas gap has also been discussed.
Zarządzanie ryzykiem w tworzeniu wartości na przykładzie przedsiębiorstwa z branży upraw rolnych i hodowli trzody chlewnej
Creators: name: Wągrowska, Paulina
Publisher: name: figshare
Year: 2013
Subjects: Economics

description: The report describes the way of risk management in the sector and, dealing with the cultivation and animals breeding, using a method of analysis scenarios. The report examines three versions: base, optimistic, pessimistic.
Risk Management in Value Creation on the example of company from the wearing apparel industry.
Creators: name: Malisz, Justyna
Publisher: name: figshare
Year: 2013
Subjects: Economics

description: This paper discusses strategies for managing working capital financing strategies on the basis of current assets and investment in current assets. The calculations based on data obtained from financial statements allow you to choose the best strategy for the analyzed company is headed to minimize the level of risk.
IN03212 Laṅkātilaka Rock Inscription of Bhuvanaikabāhu IV
Creators: name: Paranavitana, S.
Publisher: name: Zenodo
Year: 2020
Subjects: IN03212
UoC
Laṅkātilaka
Bhuvanaikabāhu IV

description: IN03212 Laṅkātilaka Rock Inscription of Bhuvanaikabāhu IV - Transcript and Translation Source: Paranavitana, S. (1960). ‘Lankatilaka Inscriptions,’ University of Ceylon Review 18, nos. 1&2, pp. 1–45. http://dlib.pdn.ac.lk/handle/123456789/1366
Determinantal Born-Infeld Coupling of Gravity and Electromagnetism
Creators: name: Afonso, Victor I.
name: Bejarano, Cecilia
name: Ferraro, Rafael
name: Olmo, Gonzalo J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study a Born-Infeld inspired model of gravity and electromagnetism in which both types of fields are treated on an equal footing via a determinantal approach in a metric-affine formulation. Though this formulation is a priori in conflict with the postulates of metric theories of gravity, we find that the resulting equations can also be obtained from an action combining the Einstein-Hilbert action with a minimally coupled nonlinear electrodynamics. As an example, the dynamics is solved for the charged static black hole.
description: 12 pages, 1 figure
Dynamical stability and filamentary instability in holographic conductors
Creators: name: Ishigaki, Shuta
name: Kinoshita, Shunichiro
name: Matsumoto, Masataka
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: In this study, we analyze the dynamical stability of the D3-D7 model dual to a holographic conductor with a constant current under an external electric field. We particularly focus on the stability around the parameter region where the multivalued relation between the external electric field and the current is shown due to nonlinear conductivity. The dynamical stability of the states can be analyzed by considering linear perturbations in the background states and computing the quasinormal modes. In the multivalued region, we find that the states in one branch with a low electric current can be dynamically unstable. The turning point in the $J$-$E$ characteristic coincides with the stability switching. Further, we also find that the perturbations around the unstable states can become stable with finite wavenumber. In other words, the perturbations in the background states become static at a critical wavenumber, implying the existence of inhomogeneous steady states with current filaments.
description: v1: 29 pages, 17 figures, v2: references added, v3: 29 pages, 18 figures, added figure 15; version accepted in JHEP
Electric Field and Voltage Fluctuations in the Casimir Effect
Creators: name: Ford, L. H.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The effects of reflecting boundaries on vacuum electric field fluctuations are treated. The presence of the boundaries can enhance these fluctuations and possibly lead to observable effects. The electric field fluctuations lead to voltage fluctuations along the worldline of a charged particle moving perpendicularly to a pair of reflecting plates, These voltage fluctuations in turn lead to fluctuations in the kinetic energy of the particle, which may enhance the probability of quantum barrier penetration by the particle. A recent experiment by Moddel {\it et al} is discussed as a possible example of this enhanced barrier penetration probability.
description: 11 pages, 1 figure
Hydrodynamic helicity polarization in relativistic heavy ion collisions
Creators: name: Yi, Cong
name: Pu, Shi
name: Gao, Jian-Hua
name: Yang, Di-Lun
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study helicity polarization through the (3+1) dimensional relativistic viscous hydrodynamic models at $\sqrt{s_{NN}}=200$GeV Au+Au collisions. Similar to the local spin polarization, we consider the helicity polarization beyond global equilibrium and investigate the contributions induced by thermal vorticity, shear viscous tensor, and the fluid acceleration. We find that the local helicity polarization induced by thermal vorticity dominates over other contributions. It also implies that in the low-energy collisions, the the fluid vorticity as part of thermal vorticity may play the crucial role to the total helicity polarization. Such a finding could be useful for probing the local strength of vorticity in rotational quark gluon plasmas by measuring helicity polarization. Our simulation confirms the strict space reversal symmetry, whereas we also compare our numerical results with approximated relations derived from ideal Bjorken flow. Our studies also provide a baseline for the future investigation on local parity violation through the correlations of helicity polarization.
description: 27 pages, 9 figures
Sophytes' Helmet.
Creators: name: Taylor, Lloyd Walter Hart
Publisher: name: Zenodo
Year: 2020
Subjects: Numismatics
Hellenistic Coinage
Parthia
Baktria
Andragoras
Sophytes

description: The hypothesis that the helmeted head on the Sophytes issue assimilated that of the Seleukos I Susa trophy coinage is a misleading fallacy. The differences observed between the two depictions far outweigh the minor general points similarity, to the extent that the argument that the former copies and assimilates the latter has no foundation. In the coinage of Andragoras and Sophytes we witness a progression in helmet depiction from the purely artistic construct of the Attic helmet depicted on the initial imitative Athenian coinage (Series 1) to an evolved realistic helmet depiction on the coinage of Sophytes (Series 7 & 8), one that clearly dates to the 3rd century BC. With this insight, the inferred chronological linkage between the Susa trophy issues of Seleukos I and the eastern coinage in the name of Sophytes collapses. As a consequence, the dating to the late 4th century BC of the preceding succession of mint control linked imitative owl and eagle issues (Andragoras and Sophytes Series 1-5) as proposed by previous scholars is unsustainable. Rather, a mid-3rd century BC date is the only viable option. This downdated chronology is supported comprehensive numismatic analysis of the coinage, details of the iconographic development on the imitative owls of Series 2, plus the sparsely documented hoard evidence.
Nonadiabatic coupled-qubit Otto cycle with bidirectional operation and efficiency gains
Creators: name: Cherubim, Cleverson
name: de Oliveira, Thiago R.
name: Jonathan, Daniel
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study a quantum Otto cycle that uses a 2-qubit working substance whose Hamiltonian does not commute with itself at different times during unitary strokes. We investigate how the cycle responds to the loss of quantum adiabaticity when these strokes are operated with a finite duration. We find that qualitative features such as the possibility of counter-rotating cycles operating as heat engines, or a cycle efficiency that can increase with a decrease in the temperature difference between the baths, are resilient even to highly nonadiabatic strokes. However, cycle efficiency rapidly decreases, although it can still remain above the standard Otto value for small degrees of quantum nonadiabaticity.
Analysis of RABITT time delays using the stationary multi-photon molecular R-matrix approach
Creators: name: Benda, Jakub
name: Mašín, Zdeněk
name: Gorfinkiel, Jimena D.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We employ the recently developed multi-photon R-matrix method for molecular above-threshold photoionization to obtain second-order ionization amplitudes that govern the interference in RABITT experiments. This allows us to extract RABITT time delays that are in better agreement with non-perturbative time-dependent simulations of this process than the typically used combination of first-order (Wigner) delays and asymptotic corrections. We calculate molecular-frame as well as orientation-averaged RABITT delays for H$_2$, N$_2$, CO$_2$, H$_2$O and N$_2$O and analyze the origin of various structures in the time delays including the effects of partial wave interference, shape resonances and orientation-averaging. Time-delays for B and C states of CO$_2^{+}$ are strongly affected by absorption of the second (IR) photon in the ion. This effect corresponds to an additional contribution, $τ_{\text{coupl}}$, to the asymptotic approximation for the RABITT delays $τ\approx τ_{\text{mol}} +τ_{cc} + τ_{\text{coupl}}$. Applicability of the asymptotic theory depends on the target and IR photon energy but typically starts at approximately 30 -- 35 eV of XUV photon energy.
Molecular composition of organic aerosols in urban and marine atmosphere: A comparison study using FIGAERO-I-CIMS, ESI-FT-ICR MS, and GC × GC-EI-ToF-MS
Creators: name: Xin, Xudong
name: Zhao, Yongyi
name: Wan, Yibei
name: Zhang, Honghai
name: Yu, Huan
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Biochemistry
subject: Pharmacology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Astronomical and Space Sciences not elsewhere classified
subject: Inorganic Chemistry
subject: FOS: Chemical sciences

description: We conducted a comparative study on chemical composition of organic aerosols (OA) collected in urban and marine atmosphere, respectively, using three mass spectrometers, Filter Inlet for Gases and Aerosol-Iodide-Chemical Ionization Mass Spectrometry (FIGAERO-I-CIMS), Electrospray Ionization-Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (ESI-FT-ICR MS), and Two-dimensional Gas Chromatograph-Electron Ionization-Mass Spectrometry (GC × GC-EI-ToF-MS). The FIGAERO-I-CIMS, ESI(–)-FT-ICR MS, and ESI(+)-FT-ICR MS showed preferred sensitivity to CHO, CHOS/CHONS, and CHON compounds, respectively. The compounds detected by the FIGAERO-I-CIMS were more oxidized and saturated than those detected by the ESI-FT-ICR MS. The GC × GC-EI-ToF-MS offered the advantage of detecting organonitrates, carbonyls, alkanes, oxy-PAHs, and amides in OA. Despite different MS technologies, some distinct features of organic compound distribution were observed between urban and marine OA. CHON compounds were more abundant in urban aerosols than marine aerosols. Organonitrates dominated over reduced-nitrogen organic compounds in all samples, and the relative importance of aromatic and aliphatic nitrates depended on MS technologies and sample type. The contribution of CHOS/CHONS compounds was high (25.1%–66.2%) in urban aerosols or marine aerosols being heavily influenced by continental sources. The most important CHOS/CHONS type in these samples were organosulfates of biogenic origin (49.4%–62.9%). Aromatics-like organosulfates contributed the least (9.1%–21.2%) to total intensity of CHOS/CHONS compounds. Considering high proportion (34.4%–62.8%) of aromatics-like compounds in OA, our result indicated that aromatic compounds were less prone to form organosulfates than aliphatic compounds. More Chlorine-containing compounds were found in clean urban atmosphere than polluted urban atmosphere. Most of Chlorine-containing compounds in urban aerosols were aliphatic, while those in marine aerosols were mostly aromatic. This study demonstrated the necessity of employing multiple MS technologies for a better characterization of chemical composition of complex organic aerosols. Copyright © 2024 American Association for Aerosol Research
NG-Scope: Fine-Grained Telemetry for NextG Cellular Networks
Creators: name: Xie, Yaxiong
name: Jamieson, Kyle
Publisher: name: arXiv
Year: 2022
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Accurate and highly-granular channel capacity telemetry of the cellular last hop is crucial for the effective operation of transport layer protocols and cutting-edge applications, such as video on demand and videotelephony. This paper presents the design, implementation, and experimental performance evaluation of NG-Scope, the first such telemetry tool able to fuse physical-layer channel occupancy readings from the cellular control channel with higher-layer packet arrival statistics and make accurate capacity estimates. NG-Scope handles the latest cellular innovations, such as when multiple base stations aggregate their signals together to serve mobile users. End-to-end experiments in a commercial cellular network demonstrate that wireless capacity varies significantly with channel quality, mobility, competing traffic within each cell, and the number of aggregated cells. Our experiments demonstrate significantly improved cell load estimation accuracy, missing the detection of less than 1% of data capacity overall, a reduction of 82% compared to OWL, the state-of-the-art in cellular monitoring. Further experiments show that MobileInsight-based CLAW has a root-mean-squared capacity error of 30.5 Mbit/s, which is 3.3x larger than NG-Scope (9.2 Mbit/s)
Identifying the contribution of higher $ρ$ mesons around 2 GeV in the $e^+ e^- \to ωπ^0$ and $e^+ e^- \to ρη^{\prime}$ processes
Creators: name: Zhou, Qin-Song
name: Wang, Jun-Zhang
name: Liu, Xiang
name: Matsuki, Takayuki
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The properties of the light vector meson states around 2.0 GeV have been poorly understood for a long time, which has become a barrier to the expansion to higher light vector meson spectrum. Recently, the BESIII collaboration released the measurements of the $e^+ e^- \to ωπ^0$ and $e^+ e^- \to ρη^{\prime}$ reactions above 2.0 GeV, both of which are ideal processes to study the isovector $ρ$ meson family. In this work, through carrying out a combined analysis of the Born cross section data for the above two processes with the theoretical support on mass spectrum, and production and strong decay behaviors of the $ρ$ meson family around 2.0 GeV, we identify the enhancement structure near 2034 MeV observed in $e^+e^-\toωπ^0$ to be the interference contribution from two resonances $ρ(1900)$ and $ρ(2150)$, and another enhancement structure at 2111 MeV reported in $e^+e^-\toρη^{\prime}$ to be the contributions from $ρ(2000)$ and $ρ(2150)$. This conclusion means that the $e^+e^-\toωπ^0$ and $e^+e^-\toρη^{\prime}$ are the excellent golden channels to establish $ρ(1900)$ and $ρ(2000)$, especially for a $D$-wave state $ρ(2000)$, whose experimental search in the $e^+e^-$ collision should be quite challenging. The relevant cross section measurements with higher precision are expected in the future BESIII and Belle II experiments.
description: 8 pages, 4 figures and 3 tables