cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Ground states of unfrustrated spin Hamiltonians satisfy an area law
Creators: name: de Beaudrap, Niel
name: Osborne, Tobias J.
name: Eisert, Jens
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We show that ground states of unfrustrated quantum spin-1/2 systems on general lattices satisfy an entanglement area law, provided that the Hamiltonian can be decomposed into nearest-neighbor interaction terms which have entangled excited states. The ground state manifold can be efficiently described as the image of a low-dimensional subspace of low Schmidt measure, under an efficiently contractible tree-tensor network. This structure gives rise to the possibility of efficiently simulating the complete ground space (which is in general degenerate). We briefly discuss "non-generic" cases, including highly degenerate interactions with product eigenbases, using a relationship to percolation theory. We finally assess the possibility of using such tree tensor networks to simulate almost frustration-free spin models.
description: 14 pages, 4 figures, small corrections, added a reference
Ideja vodilja i Kodeks ponašanja / Mission Statement and Code of Conduct
Creators: name: Đurić, Miloš
Publisher: name: Zenodo
Year: 2018

description: Serbian: PSSOH konferencija koja se ugleda na LibrePlanet konferenciju koristi postojeću Ideju vodilju i Kodeks ponašanja. U ovom Zenodo repozitorijumu nalaze se prevodi sa engleskog na srpski jezik Ideje vodilje i Kodeksa ponašanja za LibrePlanet konferenciju. Originalni tekstovi su dostupni na: https://libreplanet.org/wiki/LibrePlanet:About/Mission_Statement i sa https://libreplanet.org/wiki/LibrePlanet:Code_of_Conduct. English: PSSOH conference adheres to the Mission Statement and Code of Conduct of the LibrePlanet Conference the role model conference. This Zenodo record contains translations from English into Serbian the original texts available at: https://libreplanet.org/wiki/LibrePlanet:About/Mission_Statement and https://libreplanet.org/wiki/LibrePlanet:Code_of_Conduct.
Bent-cable quantile regression model
Creators: name: Zhang, Feipeng
name: Zheng, Shenglin
name: Zhou, Xiaoying
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Medicine
subject: Genetics
subject: FOS: Biological sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics

description: This article considers a bent-cable quantile regression model that comprises two linear segments but is smoothly jointed by a quadratic bend. This model is very flexible to allow the relationship between the response variable and a covariate of interest to change gradually or abruptly across a change point value in the covariate. However, due to the non-differentiability of the objective function in quantile regression, it is challenge to estimate the unknown parameters. Our work aims to develop a gradient-search algorithm to obtain the estimators of the regression coefficients and the change point location. We establish the asymptotic properties of proposed estimators by using the modern empirical processes theory. Monte Carlo simulation studies and an economic empirical application illustrate the good performance of our procedures.
FERREIRA, Luís Gonçalves – Vestidos de Caridade: assistência, pobreza e indumentária na Idade Moderna. O caso da Misericórdia de Braga
Creators: name: Lobo De Araújo, Maria Marta
Publisher: name: Lusitania Sacra
Year: 2023

description: Lusitania Sacra, n. 49 (2024): Ciência, religião e ensino em Portugal (séculos XVI-XVIII)
Systematic solution-generation of five-dimensional black holes
Creators: name: Iguchi, Hideo
name: Izumi, Keisuke
name: Mishima, Takashi
Publisher: name: arXiv
Year: 2011
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Solitonic solution-generating methods are powerful tools to construct nontrivial black hole solutions of the higher-dimensional Einstein equations systematically. In five dimensions particularly, the solitonic methods can be successfully applied to the construction of asymptotically Minkowski spacetimes with multiple horizons. We review the solitonic methods applicable to higher-dimensional vacuum spacetimes and present some five-dimensional examples derived from the methods.
description: Invited review for Prog. Theor. Phys. Suppl., 33 pages, 13 figures. v2: References added v3: published version
title: Rezension: "Młoda myśl wschodnia"/ Kolegium Europy Wschodniej. Wrocław: Kolegium Europy Wschodniej, 2014. ISBN 978-83-7893-192-8
Creators: name: Wlostowska, Magda
name: Digitale Wissenschaftsplattform Pol-Int (Www.Pol-Int.Org)
Publisher: name: Europa-Universität Viadrina Frankfurt
Year: 2021

description: Die Aufsatzsammlung Młoda Myśl Wschodnia wirft einen Blick auf aktuelle Konzepte polnischer Osteuropapolitiken und auf den historischen, ökonomischen, kulturellen Kontext, in dem diese stattfinden. Wie der Titel bereits erahnen lässt, besteht die Besonderheit des 2014 von der Stiftung Fundacja Energia dla Europy und dem Kollegium Europy Wschodniej im. Jana Nowaka-Jeziorańskiego herausgegebenen Sammelbandes darin, die Perspektiven ausschließlich jüngerer polnischer Osteuropa-ExpertInnen auf die Region Ost- und Ostmitteleuropa sowie die Rolle Polens in dieser Region vorzustellen.
Assessing the variability of posterior probabilities in Gaussian model-based clustering
Creators: name: Zhang, Yuchi
name: Browne, Ryan P.
name: Andrews, Jeffrey L.
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Medicine
subject: Genetics
subject: FOS: Biological sciences
subject: Evolutionary Biology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: Sociology
subject: FOS: Sociology
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics

description: We propose a variant of the bootstrap to assess the variability of posterior probabilities arising from Gaussian model-based clustering. The bootstrap variant uses predictions based on out-of-bootstrap-sample observations and then constructs confidence intervals for the posterior probabilities using the percentile method. The methodology outperforms the multivariate Delta method approach when comparing empirical coverage probabilities on simulated data. The proposed and multivariate Delta methods are also illustrated on the well-known Iris data set.
title: Recenzja: "Jak powstawały i jak upadały zakłady przemysłowe w Polsce. Losy po 1989 roku zakładów zbudowanych PRLU-u"/ Andrzej Karpiński, Wiesław Żółtkowski, Paweł Soroka, Stanisław Paradysz. Warszawa: Muza, 2013. ISBN 978-83-7758-403-3
Creators: name: Kotowicz-Jawor, Joanna
name: Digitale Wissenschaftsplattform Pol-Int (Www.Pol-Int.Org)
Publisher: name: Europa-Universität Viadrina Frankfurt
Year: 2021

description: Prezentowana monografia zawiera szczegółową analizę procesu dezindustrializacji polskiej gospodarki w okresie przejścia od gospodarki niedoboru do gospodarki rynkowej. Autorzy w oparciu o bogaty materiał empiryczny zbadali bezprecedensową skalę likwidacji sektora państwowych przedsiębiorstw przemysłowych zbudowanych w Polskiej Rzeczpospolitej Ludowej (PRL) w latach 1949-1989. Zbadano 657 firm według ich struktury gałęziowej i regionalnej. Wskazano na ich koncentrację w pięciu przemysłach: górnictwie, hutnictwie, przemyśle elektromaszynowym, spożywczym i budowy maszyn. Wskazano na ogromne negatywne skutki społeczne realizowanej polityki „Big Bang" i wywołanego przez nią znaczącego bezrobocia (spadek o 17,3% zatrudnienia w przemyśle).
title: Rezension: "Maria Skłodowska-Curie i jej kontakty ze środowiskiem krakowskim"/ Alicja Rafalska-Łasocha. Kraków: Polska Akademia Umiejętności, 2015. ISBN 978-8376762227
Creators: name: Stegmann, Natali
name: Digitale Wissenschaftsplattform Pol-Int (Www.Pol-Int.Org)
Publisher: name: Europa-Universität Viadrina Frankfurt
Year: 2021

description: Das zu besprechende Werk über die Kontakte Marie Curies nach Krakau steht im Zusammenhang mit der Traditionspflege der dortigen Jagiellonen-Universität. Aus Anlass des 650. Gründungsjubiläums derselben und des 80. Todestages der Gelehrten hat die dortige Akademie der Wissenschaft eine entsprechende Biographie in Auftrag gegeben, die auf teils unveröffentlichte Korrespondenz zurückgreifen konnte. Das so zustande gekommen Werk ist 2012 als wissenschaftshistorische Dissertation angenommen worden und liegt nun in der Druckfassung vor.
Proton Modulation in the Heliosphere for Different Solar Conditions and Prediction for AMS-02
Creators: name: Bobik, P.
name: Boella, G.
name: Boschini, M. J.
name: Consolandi, C.
name: Della Torre, S.
name: Gervasi, M.
name: Grandi, D.
name: Kudela, K.
name: Memola, E.
name: Pensotti, S.
name: Rancoita, P. G.
name: Tacconi, M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Spectra of Galactic Cosmic Rays (GCRs) measured at the Earth are the combination of several processes: sources production and acceleration, propagation in the interstellar medium and propagation in the heliosphere. Inside the solar cavity the flux of GCRs is reduced due to the solar modulation, the interaction which they have with the interplanetary medium. We realized a 2D stochastic simulation of solar modulation to reproduce CR spectra at the Earth, and evaluated the importance in our results of the Local Interstellar Spectrum (LIS) model and its agreement with data at high energy. We show a good agreement between our model and the data taken by AMS-01 and BESS experiments during periods with different solar activity conditions. Furthermore we made a prediction for the flux which will be measured by AMS-02 experiment.
description: Accepted for publication in the Proceedings of the ICATPP Conference on Cosmic Rays for Particle and Astroparticle Physics, Villa Olmo (Como, Italy), 7-8 October, 2010, to be published by World Scientific (Singapore)
title: Review: "Oblicza kapitału społecznego uniwersytetu. Diagnoza- interpretacje-konteksty"/ Maria Dudzikowa. Kraków: Oficyna Wydawnicza Impuls, 2013. ISBN 8375874744 and "Kapitał społeczny. Przypadek Polski"/ Małgorzata Gajowiak. Warszawa: Polskie Wydawnictwo Ekonomiczne, 2012. ISBN 978-83-208-2049-2
Creators: name: Kobylarek, Aleksander
name: Digitale Wissenschaftsplattform Pol-Int (Www.Pol-Int.Org)
Publisher: name: Europa-Universität Viadrina Frankfurt
Year: 2021

description: Review essay of Kapitał społeczny. Przypadek Polski and Oblicza kapitału społecznego uniwersytetu. Diagnoza- interpretacje-konteksty. Problems of the development of social capital are crucial to analysing the potential of modern organisations. Social capital is usually defined terms of bonds, engagement, or trust. Both books present a perspective of the research on social capital, but they treat the same conceptual category in different ways. Gajowiak's book aims to show the importance of the state in the process of social-capital building. Dudzikowa's research group, meanwhile, concentrates on analysing the role of the university within the science and technology development infrastructure in the same process of fostering social capital.
BOILLET, Élise; RIDEAU, Gaël, dir. – La visibilité du religieux dans l'éspace urbain de l'Europe moderne
Creators: name: Fernandes, Maria De Lurdes Correia
Publisher: name: Lusitania Sacra
Year: 2023

description: Lusitania Sacra, n. 49 (2024): Ciência, religião e ensino em Portugal (séculos XVI-XVIII)
“There's no excuse for slowing down" : doing gender, race, and class in the third age
Creators: name: Lyon, Katherine
Publisher: name: University of British Columbia
Year: 2017

description: Within social gerontology, the third age is often imagined to be a time of healthy, prosperous, flexible retirement, yet this interpretation can overshadow the experiences of more marginalized elders. Drawing on over 135 hours of participant-observation and twenty-six semi-structured interviews conducted between January and September 2015 at a Vancouver Neighbourhood House, I explicate how elder volunteers and staff take up the third age discourse through their development and implementation of a Seniors’ Drop-In Program. Drawing on feminist gerontology and the sociology of gender, I trace how these low-income elders “do” gendered and generational conceptions of aging through accessible, affordable, productive activity by replicating and revising the third age discourse mediated through institutional texts targeted toward the “boomer” generation. At the same time, elders develop distinct relationships to and perform different interpretations of these Seniors’ Drop-In activities, particularly the multicultural lunch components, based on their intersecting social locations, including generation, class, race, and gender. This thesis also explores the standpoint of staff in order to demonstrate how the work of senior-driven programming is constrained and enabled by grant-based funding and workload pressures articulated through the discourse of managerial efficiency. In sum, this work’s key findings concern how a senior-driven Drop-In Program in a Neighbourhood House context is coordinated by the complementary and contradictory textually-mediated discourses of the third age, senior-driven programming, and managerial efficiency that elders and staff enact and bring into being in particular interindividual and institutional contexts. This dissertation is sociologically significant in centring age and generation within theories of intersectionality and performativity through an inductive, qualitative exploration of low-income elders often erased from dominant third age scholarship, and through an examination of senior-driven program planning dynamics within the unique understudied context of a community-based Neighbourhood House.
Light-like Big Bang singularities in string and matrix theories
Creators: name: Craps, Ben
name: Evnin, Oleg
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Important open questions in cosmology require a better understanding of the Big Bang singularity. In string and matrix theories, light-like analogues of cosmological singularities (singular plane wave backgrounds) turn out to be particularly tractable. We give a status report on the current understanding of such light-like Big Bang models, presenting both solved and open problems.
description: 20 pages, invited review for Class. Quant. Grav; v3: section 2.3 shortened, discussion on DLCQ added in section 3.1, published version
title: Recenzja: "Polska europejska czy narodowa?"/ Maria Jarosz (red.). Warszawa: Oficyna Naukowa, 2014. ISBN 8364363093
Creators: name: Brzezińska-Pająk, Marta
name: Digitale Wissenschaftsplattform Pol-Int (Www.Pol-Int.Org)
Publisher: name: Europa-Universität Viadrina Frankfurt
Year: 2021

description: Maria Jarosz sytuuje swoją najnowszą publikację w wyraźnym kontekście wcześniejszych książek, z których każda wpisuje się w zaplanowany przez autorkę pejzaż analiz i interpretacji polskiej sytuacji społecznej, dokonywanych samodzielnie oraz przy współpracy innych autorów. Panorama Polski po transformacji systemowej byłaby w tym ujęciu projektem wieloletnim, wspartym na wcześniejszych badaniach socjologicznych autorki, zakrojonych zawsze z uwzględnieniem szerokiego spektrum zjawiska i metod. Polska europejska czy narodowa?, kontynuując ten badawczy zamysł, składa się z ośmiu rozdziałów, wstępu oraz podsumowań. We wprowadzeniu do całego opracowania, znacząco opatrzonym podtytułem Dwie czy trzy Polski – autorka sygnalizuje wiele z zagadnień, które będą przedmiotem książki, tj. m.in. sytuacja społeczno-polityczna z uwzględnieniem problematyki wykluczenia, kontekst przeszłości, będący punktem odniesienia dla diagnozy współczesności, czy też swego rodzaju rozszczepienie (narodowy i europejski aspekt), podziały i napięcia – które będą zajmowały redaktorkę i autorów tomu chyba najmocniej na przestrzeni całego opracowania.
CASTAGNETTI, Philippe; RENOUX, Christian, coord. – Sources hagiographiques et procès de canonisation. Les circulations textuelles autour du culte des saints (xvie-xxe siècle)
Creators: name: Sobral, Cristina
Publisher: name: Lusitania Sacra
Year: 2023

description: Lusitania Sacra, n. 49 (2024): Ciência, religião e ensino em Portugal (séculos XVI-XVIII)
Spin diffusion in Fermi gases
Creators: name: Bruun, G. M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We examine spin diffusion in a two-component homogeneous Fermi gas in the normal phase. Using a variational approach, analytical results are presented for the spin diffusion coefficient and the related spin relaxation time as a function of temperature and interaction strength. For low temperatures, strong correlation effects are included through the Landau parameters which we extract from Monte Carlo results. We show that the spin diffusion coefficient has a minimum for a temperature somewhat below the Fermi temperature with a value that approaches the quantum limit $\sim\hbar/m$ in the unitarity regime where $m$ is the particle mass. We finally derive a value for the low temperature shear viscosity in the normal phase from the Landau parameters.
description: 9 pages, 3 figures
Likelihood reconstruction method of real-space density and velocity power spectra from a redshift galaxy survey
Creators: name: Tang, Jiayu
name: Kayo, Issha
name: Takada, Masahiro
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We develop a maximum likelihood based method of reconstructing band powers of the density and velocity power spectra at each wavenumber bins from the measured clustering features of galaxies in redshift space, including marginalization over uncertainties inherent in the Fingers-of-God (FoG) effect. The reconstruction can be done assuming that the density and velocity power spectra depend on the redshift-space power spectrum having different angular modulations of mu with mu^{2n} (n=0,1,2) and that the model FoG effect is given as a multiplicative function in the redshift-space spectrum. By using N-body simulations and the halo catalogs, we test our method by comparing the reconstructed power spectra with the simulations. For the spectrum of mu^0 or equivalently the density power spectrum P_dd(k), our method recovers the amplitudes to a few percent accuracies up to k=0.3 h/Mpc for both dark matter and halos. For the power spectrum of mu^2, which is equivalent to the density-velocity spectrum P_dv(k) in the linear regime, our method can recover the input power spectrum for dark matter up to k=0.2 h/Mpc and at both z=0 and 1, if using the adequate FoG model. However, for the halo spectrum, the reconstructed spectrum shows greater amplitudes than the simulation P_dv(k). We argue that the disagreement is ascribed to nonlinearity effect that arises from the cross-bispectra of density and velocity perturbations. Using the perturbation theory, we derive the nonlinear correction term, and find that the leading-order correction term is proportional to mu^2 and increases the mu^2-power spectrum amplitudes at larger k, at lower redshifts and for more massive halos. We find that adding the nonlinearity correction term to the simulation P_dv(k) can fairly well reproduce the reconstructed P_dv(k) for halos up to k~0.2 h/Mpc.
description: 21 pages, 15 figures; accepted for publication in MNRAS
The utility of the MMP1-2 work interference scale with severe traumatic brain injury and stroke patients
Creators: Yanish, Tami
Publisher: name: University of Alberta Library
Year: 2004

Chapt.1: Introduction.; Chapt.2: Traumatic brain injury literature; characteristics associated with TBI; Pathophysiology of severe traumatic brain injury; Variables of interest in vocational outcome studies; Summary of STBI literature review; Stroke literature; Variables of interest in vocational outcome studies; Physiological variables and vocational outcomes; Physiological variables and vocational outcome after stroke; Demographic variables and vocational outcomes; Cognitive variables and vacational outcome; Psychological adjustment and vocational outcome; Summary of stroke literature; The MMPI-2 and the WRK Scale; Synthesis of the STBI and stroke literature; Statement of purpose; STBI hypotheses; Stroke hyptheses.; Chapt.3: Methodology: STBI and stroke samples; STBI and stroke study inclusion criteria; Tests / Materials; Experimental design for the STBI and stroke studies; Ethical considerations.; Chapt.4: Results; STBI study results; Stroke study results.; Chapt.5: Discussion for STBI and stroke studies; General statement of the findings; Discussion of the hypotheses; Implications of the research for professional practice; Limitations of the research; Suggestions for further research; Concluding summary and comments.
Doppler-free Yb Spectroscopy with Fluorescence Spot Technique
Creators: name: Nizamani, Altaf H.
name: McLoughlin, James J.
name: Hensinger, Winfried K.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We demonstrate a simple technique to measure the resonant frequency of the 398.9 nm 1S0 - 1P1 transition for the different Yb isotopes. The technique, that works by observing and aligning fluorescence spots, has enabled us to measure transition frequencies and isotope shifts with an accuracy of 60 MHz. We provide wavelength measurements for the transition that differ from previously published work. Our technique also allows for the determination of Doppler shifted transition frequencies for photoionisation experiments when the atomic beam and laser beam are not perpendicular and furthermore allows us to determine the average velocity of the atoms along the direction of atomic beam.
Quantum Storage of Photonic Entanglement in a Crystal
Creators: name: Clausen, Christoph
name: Usmani, Imam
name: Bussieres, Felix
name: Sangouard, Nicolas
name: Afzelius, Mikael
name: de Riedmatten, Hugues
name: Gisin, Nicolas
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Entanglement is the fundamental characteristic of quantum physics. Large experimental efforts are devoted to harness entanglement between various physical systems. In particular, entanglement between light and material systems is interesting due to their prospective roles as "flying" and stationary qubits in future quantum information technologies, such as quantum repeaters and quantum networks. Here we report the first demonstration of entanglement between a photon at telecommunication wavelength and a single collective atomic excitation stored in a crystal. One photon from an energy-time entangled pair is mapped onto a crystal and then released into a well-defined spatial mode after a predetermined storage time. The other photon is at telecommunication wavelength and is sent directly through a 50 m fiber link to an analyzer. Successful transfer of entanglement to the crystal and back is proven by a violation of the Clauser-Horne-Shimony-Holt (CHSH) inequality by almost three standard deviations (S=2.64+/-0.23). These results represent an important step towards quantum communication technologies based on solid-state devices. In particular, our resources pave the way for building efficient multiplexed quantum repeaters for long-distance quantum networks.
description: 5 pages, 3 figures + supplementary information; fixed typo in ref. [36]
A Fast and Accurate Calculation Scheme for Ionization Degrees in Protoplanetary and Circumplanetary Disks with Charged Dust Grains
Creators: name: Fujii, Yuri I.
name: Okuzumi, Satoshi
name: Inutsuka, Shu-ichiro
Publisher: name: arXiv
Year: 2011
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We develop a fast and accurate calculation method for ionization degrees in protoplanetary and circumplanetary disks including dust grains. We apply our method to calculate the ionization degree of circumplanetary disks. It is important to understand the structure and evolution of protoplanetary/circumplanetary disks since they are thought to be the sites of planet/satellite formation. The turbulence that causes gas accretion is supposed to be driven by magnetorotational instability (MRI) that occurs only when the ionization degree is high enough for magnetic field to be coupled to gas. We calculate the ionization degrees in circumplanetary disks to estimate the sizes of MRI-inactive regions. We properly include the effect of dust grains because they efficiently capture charged particles and make ionization degree lower. Inclusion of dust grains complicates the reaction equations and requires expensive computation. In order to accelerate the calculation of ionization reactions, we develop a semianalytic method based on the charge distribution model proposed previously. This method enables us to study the ionization state of disks for a wide range of model parameters. For a previous model of circum-Jovian disk, we find that an MRI-inactive region covers almost all regions even without dust grains. This suggests that the gas accretion rates in circumplanetary disks are much smaller than previously thought.
description: 13 pages, 7 figures
Collision-dominated spin transport in graphene and Fermi liquids
Creators: name: Mueller, Markus
name: Nguyen, Hai Chau
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In a clean Fermi liquid, due to spin up/spin down symmetry, the dc spin current driven by a magnetic field gradient is finite even in the absence of impurities. Hence, the spin conductivity sigma_s assumes a well-defined collision-dominated value in the disorder-free limit, providing a direct measure for the inverse strength of electron-electron interactions. In neutral graphene, with Fermi energy at the Dirac point, the Coulomb interactions remain unusually strong, such that the inelastic scattering rate comes close to a conjectured upper bound 1/τ_{inel} <= k_B T/\hbar, similarly as in strongly coupled quantum critical systems. The strong scattering is reflected by a minimum of the spin conductivity at the Dirac point, where it reaches sigma_s = (0.121/alpha^2) * (mu_B^2/\hbar) at weak Coulomb coupling alpha. Up to the replacement of quantum units, e^2/\hbar -> mu_s^2/\hbar, this result equals the collision-dominated electrical conductivity obtained previously. This accidental symmetry is, however, broken to higher orders in the interaction strength. For gated graphene, and 2d metals in general, we show that the transport time is parametrically smaller than the collision time. We exploit this to compute the collision-limited sigma_s analytically as sigma_s= (1/C) * (mu/T)^2 * (mu_B^2/\hbar) with C=4 pi^2 alpha^2 [2/3 ln(1/(2α))-1] for weak Coulomb coupling alpha.
description: Published version - discussion of possible experiments added; free access: http://stacks.iop.org/1367-2630/13/035009
O acesso aos arquivos romanos da Igreja Católica e a sua importância para a história de Portugal
Creators: name: De Oliveira Fontes, Paulo F.
name: Faria Marques, Pedro Daniel
name: Gomes Silva, Edgar Freitas
Publisher: name: Lusitania Sacra
Year: 2023

description: Lusitania Sacra, n. 49 (2024): Ciência, religião e ensino em Portugal (séculos XVI-XVIII)
Bonus Yangian Symmetry for the Planar S-Matrix of N=4 Super Yang-Mills
Creators: name: Beisert, Niklas
name: Schwab, Burkhard U. W.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Recent developments in the determination of the planar S-matrix of N=4 Super Yang-Mills are closely related to its Yangian symmetry. Here we provide evidence for a yet unobserved additional symmetry: the Yangian level-one helicity operator.
description: 8 pages, v2: minor changes
THE ROLE OF INTERNET TECHNOLOGY IN THE MODERN CONCEPT OF TEACHING A FOREIGN LANGUAGE
Creators: name: Jumakulova, Khalima
Publisher: name: Zenodo
Year: 2023

description: The use of information and communication technologies (ICT) can significantly expand educational opportunities. Standard forms of teaching are becoming less and less likely to attract the interest of students; there is a need to look for new methods, one of which should be the active use of digital resources in the classroom. This article examines technologies for teaching writing in English using ICT.
The two faces of quantum sound
Creators: name: Barcelo, C.
name: Garay, L. J.
name: Jannes, G.
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Fluctuations around a Bose-Einstein condensate can be described by means of Bogolubov theory leading to the notion of quasiparticle and antiquasiparticle familiar to non-relativistic condensed matter practitioners. On the other hand, we already know that these perturbations evolve according to a relativistic Klein-Gordon equation in the long wavelength approximation. For shorter wavelengths, we show that this equation acquires nontrivial corrections which modify the Klein-Gordon product. In this approach, quasiparticles can also be defined (up to the standard ambiguities due to observer-dependence). We demonstrate that---in the low as well as in the high energy regimes---both concepts of quasiparticle are actually the same, regardless of the formalism (Bogolubov or Klein-Gordon) used to describe them. These results also apply to any barotropic, inviscid, irrotational fluid, with or without quantum potential. Finally, we illustrate how the quantization of these systems of quasiparticles proceeds by analyzing a stationary configuration containing an acoustic horizon. We show that there are several possible choices of a regular vacuum state, including a regular generalization of the Boulware vacuum. Issues such us Hawking radiation crucially depend on this vacuum choice.
description: 12 pages, 4 figures; v3: published version
Effect of on-site Coulomb repulsion on phase transitions in exactly solved spin-electron model
Creators: name: Galisova, Lucia
name: Strecka, Jozef
name: Tanaka, Akinori
name: Verkholyak, Taras
Publisher: name: arXiv
Year: 2010
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A hybrid lattice-statistical model on doubly decorated planar lattices, which have localized Ising spins at their nodal lattice sites and two itinerant electrons at each pair of decorating sites, is exactly solved by the use of a generalized decoration-iteration transformation. Our main attention is focused on an in uence of the on-site Coulomb repulsion on ground-state properties and critical behavior of the investigated system.
description: 2 pages, 3 figures, presented at 14th Czech and Slovak Conference on Magnetism 6.-9. July 2010, Kosice, Slovakia
Understanding hemicellulose and silica removal from bamboo
Creators: name: Yuan, Zhaoyang
Publisher: name: University of British Columbia
Year: 2017

description: In this work, the hydrothermal pretreatment under both acidic and alkaline conditions were conducted to study hemicellulose and silica removal from bamboo. In the first part of this work, evolution of proton concentration was examined during both auto- and dilute-acid hydrolysis of hemicellulose from green bamboo. An approximate mathematical model (toy model) to describe the proton concentration based upon conservation of mass and charge during deacetylation and ash neutralization coupled with a number of competing equilibria, was derived. This model was qualitatively compared to experiments where pH was measured as a function of time, temperature, and initial acid level. The toy model predicts the existence of a steady state proton concentration dictated by equilibrium constants, initial acetyl groups, and initial added acid. At room temperature, it was found that pH remains essentially constant both at low initial pH and autohydrolysis conditions. At elevated temperatures, one case of non-monotonic behaviour in which the pH initially increased, and then decreased at longer times, was found. As silica in bamboo creates processing problems, in the second part of this work, alkaline pretreatment of pure amorphous silica particles, bamboo powder and bamboo chips was carried out to study the underlying mechanism for silica and hemicellulose extraction. Response surface methodology was also used to optimize the treatment conditions that could completely extract silica and partially extract hemicellulose from bamboo chips prior to processing. Alkaline pretreatment resulted in significant improvement in the delignification of treated bamboo chips during subsequent kraft pulping, offering an option to reduce the effective alkali charge or the H-factor. The pre-extracted silica and hemicellulose in the liquor were recovered through a sequential procedure of CO2 and ethanol precipitation. Moreover, the feasibility of adopting alkaline pretreatment to the typical kraft pulping process was tested. Results demonstrated that all silica, and up to 50% of hemicellulose in raw feedstocks, could be extracted without degrading cellulose and lignin. Approximately 96% of extracted silica in the APEL could be recovered as a high purity (>99.8%) silica nanoparticles. These results demonstrated that the proposed modification may benefit kraft pulping and fit well into the proposed biorefinery concept.
From open access to citizen science: opening participation within the SSH disciplines through the PLACES and COESO projects
Creators: name: Smaniotto, Alessia
name: Ernst, Elisabeth
Publisher: name: Zenodo
Year: 2021
Subjects: citizen science
participatory research
SSH
open science
research for society

description: The Amsterdam Call for Open Science invites further exploration of the frontiers of Open Science, suggesting this should be done in particular with regard to data sharing and to methods of opening up the scientific process to society. These suggestions come after a great deal of expertise has been achieved in open access to academic publications. Since the Amsterdam Call, Citizen Science has become a well-established domain in most of the scientific disciplines at the European level, but less is known about Citizen Science practices in the Social Sciences and Humanities (SSH), their specificity and needs, together with the diverse ways SSH researchers carry out for open themselves to participation, making a diversity of publics engaging with their methodologies. Two projects coordinated by OpenEdition Center (EHESS, France), involving SSH researchers and journalists (PLACES project) and more largely other professionals and associations (COESO project) are concrete attempts to address the issues of opening the scientific process to society and to give visibility to the specific SSH Citizen Science practices. They achieve that by encouraging and supporting participatory research and mutual learning between academics and citizens. Furthermore, they built on a major French infrastructure committed to open access to the scientific research in the SSH disciplines. The experiences from PLACES and COESO provide an insight to how open access paves the way for citizen science activities in the social sciences and humanities and how these activities can in turn greatly increase the impact of open access activities. Taking stock of them, it will be possible to highlight some aid and barriers to open participation in knowledge production. Particular attention will be given to the data sharing issue, and to the benefits of mutual learning through participatory research in the rise of scientific literacy. These experiences also provide an overview of the significance that open access and open science infrastructures of services have in supporting citizen science activities.
Real and Virtual Compton Scattering: the nucleon polarisabilities
Creators: name: Downie, E. J.
name: Fonvieille, H.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We give an overview of low-energy Compton scattering (gamma^(*) p --> gamma p) with a real or virtual incoming photon. These processes allow the investigation of one of the fundamental properties of the nucleon, i.e. how its internal structure deforms under an applied static electromagnetic field. Our knowledge of nucleon polarisabilities and their generalization to non-zero four-momentum transfer will be reviewed, including the presently ongoing experiments and future perspectives.
description: 20 pages, 12 figures. Minireview/Proceedings of "Many-Body Structure of Strongly Interacting Systems", Mainz, Germany, Feb. 23-25 2011 . V2: typos corrected. version to appear in EPJ Special Topics
Stable macroscopic quantum superpositions
Creators: name: Fröwis, F.
name: Dür, W.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the stability of superpositions of macroscopically distinct quantum states under decoherence. We introduce a class of quantum states with entanglement features similar to Greenberger-Horne-Zeilinger (GHZ) states, but with an inherent stability against noise and decoherence. We show that in contrast to GHZ states, these so-called concatenated GHZ states remain multipartite entangled even for macroscopic numbers of particles and can be used for quantum metrology in noisy environments. We also propose a scalable experimental realization of these states using existing ion-trap set-ups.
description: 4 pages, 1 figure; v2: minor changes due to referee reports
Generalised massive gravity one-loop partition function and AdS/(L)CFT
Creators: name: Bertin, Mario
name: Grumiller, Daniel
name: Vassilevich, Dmitri
name: Zojer, Thomas
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The graviton 1-loop partition function is calculated for Euclidean generalised massive gravity (GMG) using AdS heat kernel techniques. We find that the results fit perfectly into the AdS/(L)CFT picture. Conformal Chern-Simons gravity, a singular limit of GMG, leads to an additional contribution in the 1-loop determinant from the conformal ghost. We show that this contribution has a nice interpretation on the conformal field theory side in terms of a semi-classical null vector at level two descending from a primary with conformal weights (3/2,-1/2).
description: 25 p., 2 jpg figs, v2: added 6 lines of clarifying text after Eq. (2.38)
Questioning identity: Examining identity processes and threat in the context of policing mental health
Creators: name: Fuller, Serina Anne
Publisher: name: London South Bank University
Year: 2021

description: Mental health related work in policing has increased in recent decades. However, little is known about the impact of this increase on police officers’ identity. In addition, there is a dearth of research on police interactions with crime victims who experience mental health issues. The current thesis addresses these knowledge gaps by examining these aspects of policing and utilises Identity Process Theory (Breakwell, 1986, 1993, 2014) as an analytical framework. The presented analysis is based on twenty-four semi-structured interviews with police officers of varying ranks. A thematic analysis; which was both data and theory driven, resulted in three overarching themes: (i) ‘‘We are not mental health professionals’: Distinctiveness in protecting and negotiating the ‘police identity’’, (ii) ‘Crime victims with mental health issues: The challenges of protection and prosecution’, and (iii) ‘The underlying threats of a spoiled identity: The identification of victims’ mental health issues’. The findings indicate that police officers appear to experience identity threat in a variety of ways due to their mental health related work. The analysis demonstrates how officers engage in numerous coping strategies in response to potential identity threats, in order to protect and maintain a satisfactory identity. In relation to crime victims with mental health issues, officers appear to largely experience threats to efficacy and meaning because of difficulties in managing vulnerability and obtaining convictions. Such threats were apparent for both crime fighter/law enforcement and protector/welfare aspects of their identity. It was also shown that officers may experience identity threats when enquiring about victims’ mental health status due to the stigma of mental health. Such threats seemingly result in officers only broaching this topic with victims in specific circumstances, such as when the victim’s mental health issue is evident. This thesis contributes a novel insight to the policing and mental health field by demonstrating the potential workings of identity processes and threat, for officers in this context. Here, it is argued that without changes to the social and professional contexts in which police operate, identity threats are likely to endure and continue to impede working practices with crime victims who have mental health issues.
Supplementary document for Two-dimensional peripheral refraction in adults - 6371983.pdf
Creators: name: Xiaoyun, Xi
name: HAO, JIANGDONG
name: Lin, Zhenghua
name: Wang, Sidi
name: Yang, Zhikuan
name: Lan, Weizhong
name: Artal, Pablo
Publisher: name: Optica Publishing Group
Year: 2023
Subjects: Uncategorized

description: Additional Tables & Figures
Synthesis and Characterization of Surface Mounted Chiral Metal-Organic Frameworks
Creators: name: Gu, Zhi-Gang
Publisher: name: Karlsruhe
Year: 2014
Subjects: Surface mounted metal-organic frameworks
Oriented
Substrate
Chiral
Enantioselectivity

description: Chiral surface mounted metal-organic frameworks (SURMOFs), composed of metal ions and chiral organic ligands, have been grown on functionalized substrates and studied in this thesis. On one hand, the impact of the pore size of the chiral SURMOF on the enantioselectivity has been investigated in this thesis. On the other hand, oriented circular dichroism (OCD) was chosen as a tool to investigate the chirality and enantioselective separation property of chiral SURMOFs.
Biophotonics for All: Light transport through tissue
Creators: name: Akhil Kallepalli
name: Gibson, Graham
Publisher: name: Zenodo
Year: 2023
Subjects: biophotonics
STEM outreach
STEM
Demonstration Kits
Additive Manufacturing
Tissue Optics

description: This repository includes: Design files of electronics, mounts, LED Assembly (from ModLight) and LED mounts Kit overview and LEDs assembly photographs Demonstration Video of the Kit Bill of Materials Abstract: Biophotonics is becoming increasingly prominent in value and visibility. What was predominantly an advanced field of research is now being included increasingly in undergraduate and postgraduate programmes. To increase biophotonics-related STEM awareness, we developed simple and inexpensive LEDs and a camera set-up that allows visualising the blood vessels beneath the skin. The kit uses inexpensive blue, green, red and near-infrared LEDs to show the absorption of shorter wavelengths and transmission in the longer wavelengths in the finger. As an outreach and educational tool, this kit will illustrate the potential of using light for diagnostics.
description: This work was made possible through the support and contributions of the Leverhulme Trust Early Career Fellowship, seed grants from the IEEE Photonics Society and Institute of Physics Optical Group, EPSRC Impact Acceleration Account (IAA) awards [EP/R511705/1, EP/X5257161/1] and EPSRC Funding to QuantIC [EP/M01326X/1].
On the Evolution of the Velocity-Mass-Size Relations of Disk-Dominated Galaxies over the Past 10 Billion Years
Creators: name: Dutton, Aaron A.
name: Bosch, Frank C. van den
name: Faber, S. M.
name: Simard, Luc
name: Kassin, Susan A.
name: Koo, David C.
name: Bundy, Kevin
name: Huang, Jiasheng
name: Weiner, Benjamin J.
name: Cooper, Michael C.
name: Newman, Jeffrey A.
name: Mozena, Mark
name: Koekemoer, Anton
Publisher: name: arXiv
Year: 2010
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We study the evolution of the scaling relations between maximum circular velocity, stellar mass and optical half-light radius of star-forming disk-dominated galaxies in the context of LCDM-based galaxy formation models. Using data from the literature combined with new data from the DEEP2 and AEGIS surveys we show that there is a consistent observational and theoretical picture for the evolution of these scaling relations from z\sim 2 to z=0. The evolution of the observed stellar scaling relations is weaker than that of the virial scaling relations of dark matter haloes, which can be reproduced, both qualitatively and quantitatively, with a simple, cosmologically-motivated model for disk evolution inside growing NFW dark matter haloes. In this model optical half-light radii are smaller, both at fixed stellar mass and maximum circular velocity, at higher redshifts. This model also predicts that the scaling relations between baryonic quantities evolve even more weakly than the corresponding stellar relations. We emphasize, though, that this weak evolution does not imply that individual galaxies evolve weakly. On the contrary, individual galaxies grow strongly in mass, size and velocity, but in such a way that they move largely along the scaling relations. Finally, recent observations have claimed surprisingly large sizes for a number of star-forming disk galaxies at z \sim 2, which has caused some authors to suggest that high redshift disk galaxies have abnormally high spin parameters. However, we argue that the disk scale lengths in question have been systematically overestimated by a factor \sim 2, and that there is an offset of a factor \sim 1.4 between Hαsizes and optical sizes. Taking these effects into account, there is no indication that star forming galaxies at high redshifts (z\sim 2) have abnormally high spin parameters.
description: 19 pages, 10 figures, accepted to MNRAS, minor changes to previous version
Dynamical Mean-Field Theory for Molecular Electronics: Electronic Structure and Transport Properties
Creators: name: Jacob, D.
name: Haule, K.
name: Kotliar, G.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present an approach for calculating the electronic structure and transport properties of nanoscopic conductors that takes into account the dynamical correlations of strongly interacting d- or f-electrons by combining density functional theory calculations with the dynamical mean-field theory. While the density functional calculation yields a static mean-field description of the weakly interacting electrons, the dynamical mean-field theory explicitly takes into account the dynamical correlations of the strongly interacting d- or f-electrons of transition metal atoms. As an example we calculate the electronic structure and conductance of Ni nanocontacts between Cu electrodes. We find that the dynamical correlations of the Ni 3d-electrons give rise to quasi-particle resonances at the Fermi-level in the spectral density. The quasi-particle resonances in turn lead to Fano lineshapes in the conductance characteristics of the nanocontacts similar to those measured in recent experiments of magnetic nanocontacts.
description: replaced with revised version; 11 pages; 9 figures