cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: Stereoselective [4+2] Cycloaddition of Singlet Oxygen to Naphthalenes Controlled by Carbohydrates
Creators: name: Bauch, Marcel
name: Fudickar, Werner
name: Linker, Torsten
Publisher: name: Universität Potsdam
Year: 2021
Subjects: subject: 540 Chemie und zugeordnete Wissenschaften

description: Stereoselective reactions of singlet oxygen are of current interest. Since enantioselective photooxygenations have not been realized efficiently, auxiliary control is an attractive alternative. However, the obtained peroxides are often too labile for isolation or further transformations into enantiomerically pure products. Herein, we describe the oxidation of naphthalenes by singlet oxygen, where the face selectivity is controlled by carbohydrates for the first time. The synthesis of the precursors is easily achieved starting from naphthoquinone and a protected glucose derivative in only two steps. Photooxygenations proceed smoothly at low temperature, and we detected the corresponding endoperoxides as sole products by NMR. They are labile and can thermally react back to the parent naphthalenes and singlet oxygen. However, we could isolate and characterize two enantiomerically pure peroxides, which are sufficiently stable at room temperature. An interesting influence of substituents on the stereoselectivities of the photooxygenations has been found, ranging from 51:49 to up to 91:9 dr (diastereomeric ratio). We explain this by a hindered rotation of the carbohydrate substituents, substantiated by a combination of NOESY measurements and theoretical calculations. Finally, we could transfer the chiral information from a pure endoperoxide to an epoxide, which was isolated after cleavage of the sugar chiral auxiliary in enantiomerically pure form.
description: Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe; 1116
Implementation of Team Shoshin : an exercise in porting and multiprocess structuring of the kernel
Creators: name: Wang, Huay-Yong
Publisher: name: University of British Columbia
Year: 2010

description: Team Shoshin is an extension of Shoshin, a testbed for distributed software originally developed on the LSI ll/23s at the University of Waterloo. This thesis presents a description of the implementation of Team Shoshin on the Sun Workstation. With wide disparity in the underlying hardware, a major part of our initial development effort was to port Shoshin to its new hardware. The problems and design decisions faced by the porting effort and how they were overcome will be discussed. The development of Team Shoshin has provided us the opportunity to investigate the use of multiprocess structuring techniques at the kernel level. We will describe the design and implementation of the proposed kernel multiprocess structure and the rationale behind it. The applicability of the proposed kernel multiprocess structure and its impact on operating system design will be discussed drawing from experience gained through actual implementation.
Performative prefigurations of post-capitalist autonomy in social movement organising: Vulnerability and social reproduction in the German Autonomen Movement
Creators: name: Deschner, Claire J.
Publisher: name: University of Leicester
Year: 2021
Subjects: Uncategorized

description: This thesis explores the prefiguration of post-capitalist autonomies in social movement organising on the example of the German Autonomen Movement. I understand prefiguration, the effort to bring about new realities, as critically performative practise through the philosophy of embodied performativity by Judith Butler. The search for post-capitalist possibilities was a search for autonomies based on mutual survival; for autonomies not based on the undermining of other people’s autonomy but based on cooperation and mutuality. Using performance activist ethnography and participative theatre workshops I explored what meanings performances of autonomy in the Autonomen Movement carried. Fieldwork showed that individual performances of autonomy partly mirrored the performative pressures of neoliberalism and hegemonic masculinity, not only in their content – to be smart, social and strong - but also in their inability to discuss failure. Collectively however the Autonomen have managed to form an infrastructure that enables different prefigurations of post-capitalist autonomy. Here autonomy is prefigured as collective production. I explore this infrastructure through the Autonomous Marxist concept of commoning and define autonomy as the ability to determine the conditions of one’s own making and survival. Based on Butler I argue that these conditions for survival are inherently collectively produced. Keeping in mind feminist social reproduction theory I also argue that post-capitalist attempts of autonomy need to find ways to recognise the multiplicity of contributions that build these conditions despite the historical misrecognition of different forms of labour. This thesis ends with the role of vulnerability in Autonomous organising. Ontological vulnerability as the ability to affect and be affected provides the necessary point of connection to break with individualised notions of autonomy. Autonomous organising can use vulnerability for prefiguration by providing careful group structures that provide the conditions to break with established realities and deal with failure.
Asymptotic local efficiency of Cramér--von Mises tests for multivariate independence
Creators: name: Genest, Christian
name: Quessy, Jean-François
name: Rémillard, Bruno
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 62H15, 62G30 (Primary) 62E20, 60G15 (Secondary)

description: Deheuvels [J. Multivariate Anal. 11 (1981) 102--113] and Genest and Rémillard [Test 13 (2004) 335--369] have shown that powerful rank tests of multivariate independence can be based on combinations of asymptotically independent Cramér--von Mises statistics derived from a Möbius decomposition of the empirical copula process. A result on the large-sample behavior of this process under contiguous sequences of alternatives is used here to give a representation of the limiting distribution of such test statistics and to compute their relative local asymptotic efficiency. Local power curves and asymptotic relative efficiencies are compared under familiar classes of copula alternatives.
description: Published at http://dx.doi.org/10.1214/009053606000000984 in the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Diaparsis (Diaparsis) isfiriae Khalaim 2008
Creators: name: Khalaim, Andrey
name: Sheng, Mao-Ling
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ichneumonidae
Diaparsis
Diaparsis isfiriae

description: Diaparsis (Diaparsis) isfiriae Khalaim, 2008 Distribution. South China (Yunnan: 35 km N Lijiang, 27°13’ N, 100°19’ E).
description: Published as part of Khalaim, Andrey & Sheng, Mao-Ling, 2009, Review of Tersilochinae (Hymenoptera, Ichneumonidae) of China, with descriptions of four new species, pp. 67-81 in ZooKeys 14 (14) on page 72, DOI: 10.3897/zookeys.14.141, http://zenodo.org/record/576472
description: {"references": ["Khalaim AI (2008) Two new species of the genus Diaparsis Forster from southern China (Hymenoptera: Ichneumonidae: Tersilochinae). Zoosystematica Rossica 17 (1): 89 - 92."]}
How to make scholarly publishing better
Creators: name: Kostic, Milka
Publisher: name: Zenodo
Year: 2019
Subjects: scientific publishing
science and publishing
publishing
scholarly publishing
publishing crisis
reproducibility crisis
research assessment
preprints
science careers

description: Scholarly publishing is in crisis! Scholars are in crisis! Science is in crisis! World is in crisis! With so many crises comes a great deal of anxiety, fueling fast thinking and reactive behavior. In the world of scientific publishing and science evaluation this has created a pattern of attack and retreat, warring factions, and myopia resulting in a growing chasm between publishers and content creators. In this Keynote Lecture (presented at the EMUG 2019, a meeting that brings together publishing professionals), I will attempt to break the silos and bridge the chasm through arguing that publishing begins, proceeds and ends with people. My main hypothesis is that placing people first (authors, readers, reviewers, editors, publishers) can help move us out of the current impasse the relationship between publishers (journals) and scientists has reached. I will share with the audience some of the realities of the current climate of academic science, and offer to learn form them about the current climate of publishing as a profession. I will put forward one provocative solution to the current problem - decoupling research from authoring, and one more practical and easily implementable solution to the problem: making the relationship between content creators and publishers more personal.
Magneto-elastic interaction in cubic helimagnets with B20 structure
Creators: name: Maleyev, S. V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The magneto-elastic interaction in cubic helimagnets with B20 symmetry is considered. It is shown that this interaction is responsible for negative contribution to the square of the spin-wave gap $Δ$ which is alone has to disrupt assumed helical structure. It is suggested that competition between positive part of $Δ^2_I$ which stems from magnon-magnon interaction and its negative magneto-elastic part leads to the quantum phase transition observed at high pressure in $Mn Si$ and $Fe Ge$. This transition has to occur when $Δ^2=0$. For $Mn Si$ from rough estimations at ambient pressure both parts $Δ_I$ and $|Δ_{ME}|$ are comparable with the experimentally observed gap. The magneto-elastic interaction is responsible also for $2\m k$ modulation of the lattice where $\m k$ is the helix wave-vector and contribution to the magnetic anisotropy. Experimental observation by $x$-ray and neutron scattering the lattice modulation allows determine the strength of anisotropic part of the magneto-elastic interaction responsible for above phenomena and the lattice helicity.
title: Self-Persuasion: Evidence from Field Experiments at International Debating Competitions
Creators: name: Schwardmann, Peter
name: Tripodi, Egon
name: Weele, Joël J. van der
Publisher: name: Universitätsbibliothek der Ludwig-Maximilians-Universität München
Year: 2021

description: Laboratory evidence shows that when people have to argue for a given position, they persuade themselves about the position’s factual and moral superiority. Such self-persuasion limits the potential of communication to resolve conflict and reduce polarization. We test for this phenomenon in a field setting, at international debating competitions that randomly assign experienced and motivated debaters to argue one side of a topical motion. We find self-persuasion in factual beliefs and confidence in one’s position. Effect sizes are smaller than in the laboratory, but robust to a one-hour exchange of arguments and a ten-fold increase in incentives for accuracy.
Optical absorption of divalent metal tungstates: Correlation between the band-gap energy and the cation ionic radius
Creators: name: Lacomba-Perales, R.
name: Ruiz-Fuertes, J.
name: Errandonea, D.
name: Martinez-Garcia, D.
name: Segura, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: We have carried out optical-absorption and reflectance measurements at room temperature in single crystals of AWO4 tungstates (A = Ba, Ca, Cd, Cu, Pb, Sr, and Zn). From the experimental results their band-gap energy has been determined to be 5.26 eV (BaWO4), 5.08 eV (SrWO4), 4.94 eV (CaWO4), 4.15 eV (CdWO4), 3.9-4.4 eV (ZnWO4), 3.8-4.2 eV (PbWO4), and 2.3 eV (CuWO4). The results are discussed in terms of the electronic structure of the studied tungstates. It has been found that those compounds where only the s electron states of the A2+ cation hybridize with the O 2p and W 5d states (e.g BaWO4) have larger band-gap energies than those where also p, d, and f states of the A2+ cation contribute to the top of the valence band and the bottom of the conduction band (e.g. PbWO4). The results are of importance in view of the large discrepancies existent in prevoiusly published data.
description: 16 pages, 3 figures, 1 table
Hamiltonian Unification of General Relativity and Standard Model
Creators: name: Glinka, L. A.
name: Pervushin, V. N.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The Hamiltonian approach to the General Relativity and the Standard Model is studied in the context of its consistency with the Newton law, the Higgs effect, the Hubble cosmological evolution and the Cosmic Microwave Background radiation physics. The version of the Higgs potential is proposed, where its constant parameter is replaced by the dynamic zeroth Fourier harmonic of the very Higgs field. In this model, the extremum of the Coleman--Weinberg effective potential obtained from the unit vacuum--vacuum transition amplitude immediately predicts mass of Higgs field and removes tremendous vacuum cosmological density. We show that the relativity principles unambiguously treat the Planck epoch, in the General Relativity, as the present-day one. It was shown that there are initial data of the Electro-Weak epoch compatible with supposition that all particles in the Universe are final products of decays of primordial Higgs particles and W-, Z-vector bosons created from vacuum at the instant treated as the "Big-Bang".
description: 105 pages, 5 figures, 1 table, revised and added one figure
Self-similar Radiation from Numerical Rosenau-Hyman Compactons
Creators: name: Rus, Francisco
name: Villatoro, Francisco R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 35Q51, 35Q53

description: The numerical simulation of compactons, solitary waves with compact support, is characterized by the presence of spurious phenomena, as numerically-induced radiation, which is illustrated here using four numerical methods applied to the Rosenau-Hyman K(p,p) equation. Both forward and backward radiations are emitted from the compacton presenting a self-similar shape which has been illustrated graphically by the proper scaling. A grid refinement study shows that the amplitude of the radiations decreases as the grid size does, confirming its numerical origin. The front velocity and the amplitude of both radiations have been studied as a function of both the compacton and the numerical parameters. The amplitude of the radiations decreases exponentially in time, being characterized by a nearly constant scaling exponent. An ansatz for both the backward and forward radiations corresponding to a self-similar function characterized by the scaling exponent is suggested by the present numerical results.
description: To be published in Journal of Computational Physics
Phradis gibbus Holmgren 1860
Creators: name: Khalaim, Andrey
name: Sheng, Mao-Ling
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ichneumonidae
Phradis
Phradis gibbus

description: ? Phradis gibbus Holmgren, 1860 Distribution. Probably Transpalaearctic species: Europe and south of Russian Far East (Khalaim 2007), China (Shanxi) (Chao 1976).
description: Published as part of Khalaim, Andrey & Sheng, Mao-Ling, 2009, Review of Tersilochinae (Hymenoptera, Ichneumonidae) of China, with descriptions of four new species, pp. 67-81 in ZooKeys 14 (14) on page 73, DOI: 10.3897/zookeys.14.141, http://zenodo.org/record/576472
description: {"references": ["Khalaim AI (2007) 17. Subfamily Tersilochinae. In: Key to the insects of Russian Far East. Vol. IV. Neuropteroidea, Mecoptera, Hymenoptera. Pt 5. Vladivostok: Dal'nauka, 566 - 597. [In Russian].", "Chao HF (1976) An outline of the classification of the Ichneumon-flies of China (Hymenoptera: Ichneumonidae). Scientific Publisher, Beijing, China, 413 pp. [In Chinese]."]}
Computation of unirational fields
Creators: name: Gutierrez, Jaime
name: Sevilla, David
Publisher: name: arXiv
Year: 2008
Subjects: subject: Symbolic Computation (cs.SC)
subject: Commutative Algebra (math.AC)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: I.1.1; I.1.2

description: One of the main contributions which Volker Weispfenning made to mathematics is related to Groebner bases theory. In this paper we present an algorithm for computing all algebraic intermediate subfields in a separably generated unirational field extension (which in particular includes the zero characteristic case). One of the main tools is Groebner bases theory. Our algorithm also requires computing primitive elements and factoring over algebraic extensions. Moreover, the method can be extended to finitely generated K-algebras.
description: 28 pages
title: Developing genetic and chemical tools for the GenoChemetic generation of natural product analogues
Creators: name: Bailey, Christopher Samuel
Publisher: name: University of St Andrews
Year: 2020

description: Natural products provide one of the corner stones of both modern and historical medicine, contributing towards over 65 % of new FDA approved drugs that entered clinical trials between 1981 and 2014. It is partly down to the historic success of natural products in medicine that many people are once again looking to nature for a solution to the rise in antibiotic resistant bacterial infections. However, developing natural products towards clinical use poses a number of challenges. Notable examples of these challenges include the need to generate analogues of these compounds, which are oftentimes structurally complex, and the instability of many natural products. Within this work several approaches are set out to address these challenges, exploring novel genetic and complementary synthetic technologies, as well as looking towards natural solutions for sequestering and stabilising molecules. Chapters 2 – 5 explore tools towards the GenoChemetic generation of natural product analogues. Firstly the utilisation of alkyne tags in a GenoChemetic approach is explored. Chapter 2 first looks towards exploring the flexibility of a series of biosynthetic gene clusters to the uptake of alkyne containing starter units. Chapter 3 then generates genetic cassettes for the in situ biosynthesis of such starter units, for subsequent potential incorporation into natural products. A well utilised bioorthogonal handle within the group are aryl halides. Chapter 4 looks towards the genetic installation of such a handle onto natural products. Chapter 5 than goes on to explore work towards the development of a fluorogenic screening platform that could be used to screen for halogenase enzyme activity. Finally, in Chapter 6, a novel approach towards the photoprotection of polyene natural products is explored. Medicinally promising compounds that have poor photostability are often discounted from development. Here, Sporopollenin Exine Capsules (SpECs) are used to encapsulate the potent polyene antibiotic, marinomycin A, with a subsequent increase in its half-life under intense light from 95 s to over 7 hrs. This cheap, simple, and sustainable technology has the potential to provide a powerful new approach to drug stabilisation and delivery, as well as an exciting new tool for natural product extraction and purification.
Integrating local area networks to improve reliability and performance
Creators: name: Chan, Kenneth Chi-Kin
Publisher: name: University of British Columbia
Year: 2010

description: A hybrid network comprising an Ethernet and a Cambridge Ring has been proposed by researchers in the Department of Computer Science at the University of British Columbia as a means for improving reliablility and performance of computer communication in a local area network environment. This thesis explores the practicability of this concept and constructs a generalization of this model, where an arbitrary number of LANs, of arbitrary technologies, may be used together in an integrated fashion. The goal is a set of software primitives which provides a connection-oriented message-based IPC interface, and allows a user to utilize multiple networks with relative ease. A number of relevent design issues, including host reachability, path selection, and load monitoring are dealt with in detail. Also discussed is an implementation of this software interface here at the University of British Columbia, developed on Sun workstations running 4.2 BSD Unix which are inter-connected by an Ethernet and a Cambridge Ring. Measurement results on the performance of the implemented software are included.
Transport through a quantum dot subject to spin and charge bias: Kondo regime
Creators: name: Swirkowicz, R.
name: Barnas, J.
name: Wilczynski, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Spin and charge transport through a quantum dot coupled to external nonmagnetic leads is analyzed theoretically in terms of the non-equilibrium Green function formalism based on the equation of motion method. The dot is assumed to be subject to spin and charge bias, and the considerations are focused on the Kondo effect in spin and charge transport. It is shown that the differential spin conductance as a function of spin bias reveals a typical zero-bias Kondo anomaly which becomes split when either magnetic field or charge bias are applied. Significantly different behavior is found for mixed charge/spin conductance. The influence of electron-phonon coupling in the dot on tunneling current as well as on both spin and charge conductance is also analyzed.
description: 22 pages, 7 figures
Avant-propos
Creators: name: Adler, Aurélie
name: Coudreuse, Anne
Publisher: name: Classiques Garnier
Year: 2019
Subjects: subject: Autobiographe
subject: Rousseau
subject: Stendhal
subject: Critique
subject: René Démoris

description: Les relations entre écrits personnels et romanesque, peu étudiées jusqu’ici, engagent pourtant des questions d’ordre poétique, esthétique et existentiel centrales dès lors qu’on entend rendre compte des dynamiques narratives propres aux genres des Mémoires, de l’autobiographie ou du journal. Les contributions rassemblées dans ce volume mettent en évidence les modes d’appropriation et de distanciation du romanesque au sein des écritures de soi.
title: Cursed Consumers and the Effectiveness of Consumer Protection Policies
Creators: name: Ispano, Alessandro
name: Schwardmann, Peter
Publisher: name: Universitätsbibliothek der Ludwig-Maximilians-Universität München
Year: 20

description: We model firms’ quality disclosure and pricing in the presence of cursed consumers, who fail to be sufficiently skeptical about undisclosed quality. We show that cursed consumers are exploited in duopoly markets if firms are vertically differentiated, if there are few cursed consumers, and if average product quality is high. Three common consumer protection policies that work under monopoly, i.e. mandatory disclosure, third party disclosure and consumer education, may all increase exploitation and decrease welfare. Even where these policies improve overall welfare, they often lead to a reduction in consumer surplus. We show that our conclusions hold in extensions with endogenous quality choice and horizontal differentiation.
Lifshitz asymptotics for Hamiltonians monotone in the randomness
Creators: name: Veselic', Ivan
Publisher: name: arXiv
Year: 2007
Subjects: subject: Spectral Theory (math.SP)
subject: Mathematical Physics (math-ph)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 35J10, 82B44

description: In various aspects of the spectral analysis of random Schroedinger operators monotonicity with respect to the randomness plays a key role. In particular, both the continuity properties and the low energy behaviour of the integrated density of states (IDS) are much better understood if such a monotonicity is present in the model than if not. In this note we present Lifshitz-type bounds on the IDS for two classes of random potentials. One of them is a slight generalisation of a model for which a Lifshitz bound was derived in a recent joint paper with Werner Kirsch [KV]. The second one is a breather type potential which is a sum of characteristic functions of intervals. Although the second model is very simple, it seems that it cannot be treated by the methods of [KV]. The models and the proofs are motivated by well-established methods developed for so called alloy type potentials.
description: This is a note for the report on the Oberwolfach Mini-Workshop: Multiscale and Variational Methods in Material Science and Quantum Theory of Solids
A geometric approach to tau-functions of difference Painlevé equations
Creators: name: Tsuda, Teruhisa
Publisher: name: arXiv
Year: 2008
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: We present a unified description of birational representation of Weyl groups associated with T-shaped Dynkin diagrams, by using a particular configuration of points in the projective plane. A geometric formulation of tau-functions is given in terms of defining polynomials of certain curves. If the Dynkin diagram is of affine type ($E_6^{(1)}$, $E_7^{(1)}$ or $E_8^{(1)}$), our representation gives rise to the difference Painlevé equations.
description: 12 pages
title: Spin Doctors: An Experiment on Vague Disclosure
Creators: name: Deversi, Marvin
name: Ispano, Alessandro
name: Schwardmann, Peter
Publisher: name: Universitätsbibliothek der Ludwig-Maximilians-Universität München
Year: 2021

description: Unfavorable news are often delivered under the disguise of vagueness. Our theory-driven laboratory experiment investigates this strategic use of vagueness in voluntary disclosure and asks whether there is scope for policy to improve information transmission. We find that vagueness is profitably deployed by senders to fool those receivers that lack strategic sophistication. Imposing precise disclosure leads to more easily interpretable messages, but results in fewer sender types disclosing at all. Since non- disclosure also systematically misleads naive receivers, the welfare implications of imposing precision are not obvious. However, our model and experiment show that information transmission and the welfare of naive receivers are improved by policies that impose precision. Our results speak to the rules governing firms’ disclosure of quality-relevant information, the disclosure of research findings, and testimonies in a court of law.
S-matrix and Quantum Tunneling in Gravitational Collapse
Creators: name: Ciafaloni, M.
name: Colferai, D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Using the recently introduced ACV reduced-action approach to transplanckian scattering of light particles, we show that the $S$-matrix in the region of classical gravitational collapse is related to a tunneling amplitude in an effective field space. We understand in this way the role of both real and complex field solutions, the choice of the physical ones, the absorption of the elastic channel associated to inelastic multigraviton production and the occurrence of extra absorption below the critical impact parameter. We are also able to compute a class of quantum corrections to the original semiclassical $S$-matrix that we argue to be qualitatively sensible and which, generally speaking, tend to smooth out the semiclassical results.
description: 19 pages, 4 figures, latex
Effect of geometrical size of the particles in a hot and dense hadron gas
Creators: name: Mishra, M.
name: Singh, C. P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Incorporation of the finite size of baryons into the equation of state (EOS) of a hot and dense hadron gas (HG) in a thermodynamically consistent manner has been a much studied problem. We first review its current status. Various models have been proposed in order to account for the repulsive force generated by the hard-core geometrical size of the baryons resulting in an excluded volume effect in the EOS. We examine the criterion of the thermodynamical consistency of these models and summarize their shortcomings. In order to remove the shortcomings, we propose a new model which incorporates the excluded volume effect in a thermodynamically consistent manner. We find that the new model works even for the cases of extremely large temperatures and densities where most of other approaches fail. Furthermore, the new expressions for thermodynamical variables resemble in form with those obtained from thermodynamically inconsistent models and thus a useful correction factor has been suggested here which converts inconsistent expressions into thermodynamically consistent ones. Finally we compare the predictions of new model with those obtained from various old models.
description: 19 pages, 9 figures, accepted for publication in Phys. Rev. C
Flare Induced Sunquake Signatures in the Ultraviolet as Observed by the Atmospheric Imaging Assembly
Creators: name: Quinn, Sean
name: Mathioudakis, Mihalis
name: Nelson, Christopher J.
name: Milligan, Ryan O.
name: Reid, Aaron
name: Jess, David B.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Sunquakes (SQs) have been routinely observed in the solar photosphere, but it is only recently that signatures of these events have been detected in the chromosphere. We investigate whether signatures of SQs are common in Ultraviolet (UV) continua, which sample the solar plasma several hundred km above where SQs are typically detected. We analyse observations from the Solar Dynamics Observatory's Atmospheric Imaging Assembly (SDO/AIA) 1600 Å and 1700 Å passbands, for SQ signatures induced by the flares of Solar Cycle 24. We base our analysis on the 62 SQs detected in the recent statistical study presented by Sharykin & Zosovichev (2020). We find that 9 out of 62 SQ candidates produced a response that is clearly detected in running difference images from the AIA 1600 Å and 1700 Å channels. A binary frequency filter with a width of 2 mHz, centred on 6 mHz, was applied to the data. The first signature of each SQ was detected at distances between 5.2 Mm to 25.7 Mm from the associated flare ribbon. Time-distance and regression analysis allowed us to calculate the apparent transverse velocities of the SQs in the UV datasets and found maximum velocities as high as 41 km s-1, 87 Mm away from the SQ source. Our analysis shows that flare induced SQ signatures can be detected in the SDO/AIA 1600 Å and 1700 Å passbands, hinting at their presence in the lower chromosphere. There was no apparent correlation between GOES flare classification, and the appearance of the SQ at these heights.
Call for Papers - FORUM: Recognizing Authors / Thinkers, Research Groups and National Institutions and their Contributions to the Theory and Practice of Contemporary Administration
Creators: name: Costa, Alessandra de Sá Mello da
name: Azevedo, Ariston
name: Meneghetti, Francis Kanashiro
Publisher: name: Zenodo
Year: 2021
Subjects: Authors
Thinkers
Research Groups
National Institutions
Contributions
Theory and Practice
Contemporary Administration
Forum
Call for Papers
Autores
Pesquisadores
Grupos de Pesquisa
Instituições Nacionais
Contribuições
Teoria e Prática
Administração Contemporânea

description: Assista ao webinar com os organizadores e editor-chefe: https://www.youtube.com/watch?v=A9EqaBHTc8A IMPORTANT DEADLINES
 Submissions: Theoretical Essays and Provocations can be submitted continuously until April 21st, 2024.
 Publications: approved texts will be published in regular issues of RAC and identified as belonging to the Forum. ORGANIZERS
 Alessandra de Sá Mello da Costa – PUC-Rio, IAG Business School, Brazil (alessandra.costa@iag.puc-rio.br)
 Ariston Azevedo – Federal University of Rio Grande do Sul, Brazil (ariston.azevedo@ufrgs.br)
 Francis Kanashiro Meneghetti – Federal Technological University of Paraná, Brazil (fkmeneghetti@gmail.com)
Characterizing user workload for capacity planning
Creators: name: Pang, Jee Fung
Publisher: name: University of British Columbia
Year: 2010

description: With the widespread use of computers in today's industry, planning system configurations in computer sites plays an increasingly important role. The process of planning system configurations or determining hardware requirements for new or existing systems is commonly known as capacity planning among performance researchers and analysts. This thesis presents a refined capacity planning process for centralized computing system, with special attention to characterizing user workload for capacity planning. The objective is to make the entire process simpler for the computer user community, while relieving the capacity planner or performance analyst from having to rely on guesswork for the user workload performance factors. The process is divided into four phases; namely, data collection, data reduction, workload/user classification and, modeling and performance analysis. The second and third phases are collectively known as user workload characterization. The main objective of our workload characterization is to avoid any guess work on the performance factors that cannot be easily measured. The results of the workload characterization process are specifically meant to be used in analytic and simulation modeling. Three software tools required for the data reduction, workload/user classification and performance analysis phases have been developed and are discussed in the thesis.
Steady state statistics of driven diffusions
Creators: name: Maes, Christian
name: Netocny, Karel
name: Wynants, Bram
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We consider overdamped diffusion processes driven out of thermal equilibrium and we analyze their dynamical steady fluctuations. We discuss the thermodynamic interpretation of the joint fluctuations of occupation times and currents; they incorporate respectively the time-symmetric and the time-antisymmetric sector of the fluctuations. We highlight the canonical structure of the joint fluctuations. The novel concept of traffic complements the entropy production for the study of the occupation statistics. We explain how the occupation and current fluctuations get mutually coupled out of equilibrium. Their decoupling close-to-equilibrium explains the validity of entropy production principles.
description: rewritten version
SQUID-based instrumentation for ultra-low-field MRI
Creators: name: Zotev, V. S.
name: Matlashov, A. N.
name: Volegov, P. L.
name: Urbaitis, A. V.
name: Espy, M. A.
name: Kraus, R. H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Medical Physics (physics.med-ph)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: Magnetic resonance imaging at ultra-low fields (ULF MRI) is a promising new imaging method that uses SQUID sensors to measure the spatially encoded precession of pre-polarized nuclear spin populations at a microtesla-range measurement field. In this work, a seven-channel SQUID system designed for simultaneous 3D ULF MRI and magnetoencephalography (MEG) is described. The system includes seven second-order SQUID gradiometers, characterized by magnetic field resolutions of 1.2 - 2.8 fT/rtHz. It is also equipped with five sets of coils for 3D Fourier imaging with pre-polarization. Essential technical details of the design are discussed. The system's ULF MRI performance is demonstrated by multi-channel 3D images of a preserved sheep brain acquired at 46 microtesla measurement field with pre-polarization at 40 mT. The imaging resolution is 2.5 mm x 2.5 mm x 5 mm. The ULF MRI images are compared to images of the same brain acquired using conventional high-field MRI. Different ways to improve imaging SNR are discussed.
description: To appear in Proceedings of 11th International Superconductive Electronics Conference (ISEC 2007); 8 pages, 11 figures
String order and hidden topological symmetry in the SO(2n+1) symmetric matrix product states
Creators: name: Tu, Hong-Hao
name: Zhang, Guang-Ming
name: Xiang, Tao
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We have introduced a class of exactly soluble Hamiltonian with either SO(2n+1) or SU(2) symmetry, whose ground states are the SO(2n+1) symmetric matrix product states. The hidden topological order in these states can be fully identified and characterized by a set of nonlocal string order parameters. The Hamiltonian possesses a hidden $(Z_{2}\times Z_{2})^{n} $ topological symmetry. The breaking of this hidden symmetry leads to $4^{n}$ degenerate ground states with disentangled edge states in an open chain system. Such matrix product states can be regarded as cluster states, applicable to measurement-based quantum computation.
description: 5 pages, 1 figure
Convergence rates of posterior distributions for noniid observations
Creators: name: Ghosal, Subhashis
name: van der Vaart, Aad
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 62G20 (Primary) 62G08 (Secondary)

description: We consider the asymptotic behavior of posterior distributions and Bayes estimators based on observations which are required to be neither independent nor identically distributed. We give general results on the rate of convergence of the posterior measure relative to distances derived from a testing criterion. We then specialize our results to independent, nonidentically distributed observations, Markov processes, stationary Gaussian time series and the white noise model. We apply our general results to several examples of infinite-dimensional statistical models including nonparametric regression with normal errors, binary regression, Poisson regression, an interval censoring model, Whittle estimation of the spectral density of a time series and a nonlinear autoregressive model.
description: Published at http://dx.doi.org/10.1214/009053606000001172 in the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Universality of three gaugino anomalous dimensions in N=4 SYM
Creators: name: Beccaria, Matteo
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study maximal helicity three gaugino operators in N=4 Super Yang-Mills theory. We show that the lowest anomalous dimension of scaling operators with generic finite spin can be expressed in terms of the universal anomalous dimension appearing at twist-2. This statement is rigourously proved at three loops. The reason for this universality between sectors with different twist is the hidden psu(1|1) invariance of the su(2|1) subsector of the theory.
description: 13 pages, JHEP style
Brownian motion in a non-homogeneous force field and photonic force microscope
Creators: name: Volpe, Giorgio
name: Volpe, Giovanni
name: Petrov, Dmitri
Publisher: name: arXiv
Year: 2007
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: The Photonic Force Microscope (PFM) is an opto-mechanical technique based on an optical trap that can be assumed to probe forces in microscopic systems. This technique has been used to measure forces in the range of pico- and femto-Newton, assessing the mechanical properties of biomolecules as well as of other microscopic systems. For a correct use of the PFM, the force field to measure has to be invariable (homogeneous) on the scale of the Brownian motion of the trapped probe. This condition implicates that the force field must be conservative, excluding the possibility of a rotational component. However, there are cases where these assumptions are not fulfilled Here, we show how to improve the PFM technique in order to be able to deal with these cases. We introduce the theory of this enhanced PFM and we propose a concrete analysis workflow to reconstruct the force field from the experimental time-series of the probe position. Furthermore, we experimentally verify some particularly important cases, namely the case of a conservative or rotational force-field.
The effect of elastic disorder on single electron transport through a buckled nanotube
Creators: name: Evseev, S. S.
name: Burmistrov, I. S.
name: Tikhonov, K. S.
name: Kachorovskii, V. Yu.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study transport properties of a single electron transistor based on elastic nanotube. Assuming that an external compressive force is applied to the nanotube, we focus on the vicinity of the Euler buckling instability. We demonstrate that in this regime the transport through the transistor is extremely sensitive to elastic disorder. In particular, built-in curvature (random or regular) leads to the ``elastic curvature blockade'': appearance of threshold bias voltage in the $I$-$V$ curve which can be larger than the Coulomb-blockade-induced one. In the case of a random curvature, an additional plateau in dependence of the average current on a bias voltage appears.
description: 16 LaTeX pages, 16 figures
The effect of hydrogen enrichment on the forced response of CH4/H2/Air laminar flames
Creators: name: Lim, Zhengli
name: Li, Jingxuan
name: Morgans, Aimee S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Hydrogen-enrichment of conventional natural gas mixtures is an actively-explored strategy for reducing pollutant emissions from combustion. This study investigates the effect of hydrogen enrichment on the unsteady flame response to perturbations, with a view to understanding the implications for thermoacoustic stability. The Level Set Approach for kinematically tracking the flame front was applied to a laminar conical premixed methane / hydrogen / air flame subjected to 2D incompressible velocity perturbations. For hydrogen enrichment levels ranging from 0% to 80% by volume, the resulting unsteady heat release rate of the flame was used to generate the Flame Describing Functions (FDFs). This was performed across a range of perturbation frequencies and levels at ambient pressure. The mean heat release rate of the flame was fixed at $\overline{\dot{Q}} = 2.69\ \textrm{kW}$ and the equivalence ratio was set to $φ=1.08$ for all hydrogen enrichment levels. Hydrogen-enrichment was found to shift the FDF gain drop-off to higher frequencies, which will increase propensity to thermoacoustic instability. It also reduced the effective flame time delay. Sensitivity analyses at $φ= 0.8$ revealed that the changes in FDF were driven predominantly by the flame burning speed, and were insensitive to changes in Markstein length.
description: Accepted for publication in International Journal of Hydrogen Energy
Flosy : a nonpreemptive FEP operating system
Creators: name: Wu, Jean
Publisher: name: University of British Columbia
Year: 2010

description: In high-speed data acquisition systems where efficient data interrupt handling is the central issue, it is often desirable to off-load the real-time data acquisition tasks to a dedicated front-end processor (FEP), leaving the host to handle only the non-real-time tasks. The front-end processor in such a system setup requires an executive program which must be individually designed to handle the functions dedicated to it. This thesis documents the design and implementation of such a FEP operating system. The FEP hardware module we are concerned with consists of a DCJ-11 microprocessor, 128 Kbytes physical memory and a Q-bus to which various interface devices are attached. By applying the layering principle, the FEP operating system can be organized into a 5-layer hierarchy; each layer building on top of the services provided by the lower layers. The FEP operating system has been implemented and tested at TRIUMF where a new, high-speed data acquisistion system is being developed.
On the origin of the particles in black hole evaporation
Creators: name: Schützhold, Ralf
name: Unruh, William G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present an analytic derivation of Hawking radiation for an arbitrary (spatial) dispersion relation $ω(k)$ as a model for ultra-high energy deviations from general covariance. It turns out that the Hawking temperature is proportional to the product of the group $dω/dk$ and phase $ω/k$ velocities evaluated at the frequency $ω$ of the outgoing radiation far away, which suggests that Hawking radiation is basically a low-energy phenomenon. Nevertheless, a group velocity growing too fast at ultra-short distances would generate Hawking radiation at ultra-high energies (``ultra-violet catastrophe'') and hence should not be a realistic model for the microscopic structure of quantum gravity.
description: 4 pages RevTex
РАЗВИТИЕ АНГЛИЙСКОГО ЯЗЫКА В НОРМАНДСКИЙ ПЕРИОД
Creators: name: Олимов, Х.Ю.
name: Касымова, Д.
name: Махмудов, Ш.
name: Ортикова, Г.
Publisher: name: Zenodo
Year: 2023

description: Эта статья посвящена историческому развитию английского языка и различным теоретическим взглядам ученых, а также важности усвоения слов.
The ionization of carbon at 10-100 times the diamond density and in the 10$^6$ K temperature range
Creators: name: Dharma-wardana, M. W. C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The behaviour of partially ionized hot compressed matter is critical to the study of planetary interiors as well as for nuclear fusion studies. A recent quantum study of carbon in the 10-70 Gbar range and at a temperature of 100 eV used $N$-atom density functional theory (DFT) with $N\sim 32$-64 and molecular dynamics (MD). This involves band-structure type electronic calculations and averaging over many MD generated ion configurations. The calculated average number of free electrons per ion, viz., $\bar{Z}$, was systematically higher than from a standard average atom (AA) quantum calculation. To clarify this offset, we examine (a) the effect of the self-interaction (SI) error in such estimates (b) the possibility of carbon being a granular plasma containing Coulomb crystals. The possibility of `magic-number' bound states is considered. The electrical conductivity, pressure, and the compressibility of the carbon system are examined. The very low conductivity and the high $\bar{Z}$ results of DFT-MD point to the existence of carbon in a complex non-uniform low-conducting dispersed phase, possibly containing magic-number Coulomb crystals. The NPA estimate of $\bar{Z}$, conductivity, compressibility, and pressure reported here pertain to the {\it uniform liquid}.
description: 9 pages, four figures