cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
On Larkin-Imry-Ma State of 3He-A in Aerogel
Creators: name: Volovik, G. E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Soft Condensed Matter (cond-mat.soft)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Superfluid 3He-A shares the properties of spin nematic and chiral orbital ferromagnet. Its order parameter is characterized by two vectors d and l. This doubly anisotropic superfluid, when it is confined in aerogel, represents the most interesting example of a system with continuous symmetry in the presence of random anisotropy disorder. We discuss the Larkin-Imry-Ma state, which is characterized by the short-range orientational order of the vector l, while the long-range orientational order is destroyed by the collective action of the randomly oriented aerogel strings. On the other hand, sufficiently large regular anisotropy produced either by the deformation of the aerogel or by applied superflow suppresses the Larkin-Imry-Ma effect leading to the uniform orientation of the vector l. This interplay of regular and random anisotropy allows us to study many different effects.
description: 10 pages, 6 Figures, new JLTP style, version to be published in JLTP (Proceedings of QFS-2007)
Extreme photo-polarimetric behaviour of the blazar AO 0235+164
Creators: name: Cellone, Sergio A.
name: Romero, Gustavo E.
name: Combi, Jorge A.
name: Marti, Josep
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present optical photo-polarimetric observations with high temporal resolution of the blazar AO 0235+164. Our data, the first to test the photo-polarimetric behaviour of this object at very short time-scales, show significant micro-variability in total flux, colour index, linear polarization degree, and position angle. Strong inter-night variations are also detected for these parameters. Although no correlation between colour index and total flux was found, our data seem to support the general bluer-when-brighter trend already known for this object. The polarization degree, in turn, shows no correlation with total flux, but a clear trend in the sense that colour index is redder (the spectrum is softer) when the measured polarization is higher.
description: Accepted by MNRAS (Letters), 5 pages
Breakdown of the ionization potential theorem of density functional theory in mesoscopic systems
Creators: name: Nazarov, Vladimir U.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The IP-theorem of the Kohn-Sham (KS) density functional theory (DFT) states that the energy of the highest occupied molecular orbital (HOMO) $ε_{HOMO}$ equals the negative of the first ionization potential (IP), thus ascribing a physical meaning to one of the eigenvalues of the KS hamiltonian. We scrutinize the fact that the validity of the IP-theorem relies critically on the electron density $n({\bf r})$, far from the system, to be determined by HOMO only, behaving as $n({\bf r}) \underset{r\to\infty}{\sim} e^{- 2 \sqrt{-2 ε_{HOMO}} r}$. While this behavior always holds for finite systems, it does not hold for mesoscopic ones, such as quasi-two-dimensional (Q2D) electron gas or Q2D crystals. We show that this leads to the violation of the IP-theorem for the latter class of systems. This finding has a strong bearing on the role of the KS valence band with respect to the work-function problem in the mesoscopic case. Based on our results, we introduce a concept of the IP band structure as an observable alternative to its unphysical KS counterpart. A practical method of the determination of IP band structure in terms of DFT quantities is provided.
description: 8 pages, 4 figures
Physiological, ultrastructural and cytochemical studies on the utilization of various intermediates of the purine catabolism pathway as sole sources of nitrogen by marine phytoplankters
Creators: name: Huynh, Hanh Kim
Publisher: name: University of British Columbia
Year: 2010

description: Eleven species of marine microalgae belonging to six different taxonomic divisions were tested for their ability to grow on allantoin, allantoic acid, hypoxanthine and urea as sole sources of nitrogen. All species were able to utilize the nitrogen atoms of urea but only six of these were able to grow on allantoic acid, while five showed moderate to good growth in hypoxanthine. None was able to utilize allantoin. The study of nickel requirements for the growth of these microalgae on the different sources of nitrogen, together with the results of inhibitor tests suggest that those species capable of utilizing both hypoxanthine and allantoic acid catabolize purines through the standard pathway of purine oxidation described in other microorganisms and higher plants. This pathway leads to the production of urea and its subsequent conversion to utilizable ammonium. In the case of one species, Pavlova lutheri, growth on urea is inhibited by urease inhibitors, while growth in allantoic acid or hypoxanthine occurs in the presence, of urease inhibitors. The results suggest that in this case the catabolic oxidation of purines and their derivatives does not involve urea production and occurs through a pathway different from that observed in the other species. Cells of Amphidinium carterae grown on hypoxanthine undergo major ultrastructural changes. These affect the perichromatinic granules, the dictyosomes and dictyosome-derived vesicles, the distribution of the endoplasmic reticulum, the number of mitochondria and microbodies, and the size and distribution of the vacuolar compartment. Some of these ultrastructural changes, such as increase in endoplasmic reticulum and the number of microbodies, along with the cytochemical demonstration of both uricase and catalase activities within microbodies, support the occurrence in these microalgae of the standard pathway for the catabolic degradation of purines. Cells of both Dunaliella tertiolecta and Pavlova lutheri grown on hypoxanthine also undergo major ultrastructural changes. These affect mainly the endoplasmic reticulum, mitochondria and vacuoles. The effect on mitochondria is particularly interesting since cytochemical tests reveal the presence of both uricase and catalase activities in these organelles. When one takes into consideration that no microbodies are observed in these microalgae and that uricase controls the key step of the formation of allantoin and H₂O₂ through the oxidation of urate, it becomes apparent that in these microalgae mitochondria participate in the oxidative degradation of purines and their derivatives and play a major role in the organic N-budget of these microorganisms.
JAMES: Junk Authorizations for Massive-scale Enterprise Services
Creators: name: Beznosov, Konstantin
Publisher: name: Zenodo
Year: 2005
Subjects: JAMES
SAAM
access control
authorization
publish-subscribe
Engineering Security Mechanisms

description: The request-response paradigm used for distributed access control solutions commonly leads to point-to-point (PTP) architectures with security enforcement logic obtaining decisions from the authorization servers through remote procedure calls. In massive-scale and complex enterprises, PTP authorization architectures result in fragile and sub-efficient solutions. The architectures also fail to exploit virtually free CPU and network bandwidth resources. This talk describes the approach taken by JAMES project to leverage publish-subscribe architectures for increasing failure resilience and performance through flooding delivery channels with speculatively pre-computed authorizations and recycling them on just-in-time basis. The talk also provides a brief overview of other research projects conducted at the Laboratory for Education and Research in Secure Systems Engineering (LERSSE), the University of British Columbia, Vancouver, Canada
The Ubiquity of Gauged Q-Shells
Creators: name: Heeck, Julian
name: Rajaraman, Arvind
name: Verhaaren, Christopher B.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Non-topological gauged soliton solutions called Q-balls arise in many scalar field theories that are invariant under a U(1) gauge symmetry. The related, but qualitatively distinct, Q-shell solitons have only been shown to exist for special potentials. We investigate gauged solitons in a generic sixth-order polynomial potential (that contains the leading effects of many effective field theories) and show that this potential generically allows for both Q-balls and Q-shells. We argue that Q-shell solutions occur in many, and perhaps all, potentials that have previously only been shown to contain Q-balls. We give simple analytic characterizations of these Q-shell solutions, leading to excellent predictions of their physical properties.
description: 18 pages, 6 figures; v2: matches PRD version. v3: fixed typo in Eq.(2)
Pozycja duszpasterska spowiedzi w Kościele na Malcie
Creators: name: Derdziuk, Andrzej
Publisher: name: Komitet Nauk Teologicznych Polskiej Akademii Nauk
Year: 2018
Subjects: teologia moralna
sekularyzacja
spowiedź
Malta

description: Artykuł opisuje proces sekularyzacji na Malcie, który jest spowodowany przez wpływ kultury anglosaskiej, wrogiej Kościołowi katolickiemu, oraz wzrost dobrobytu. Odchodzenie od praktyk religijnych zaznacza się nade wszystko w życiu ludzi młodych i wyraża się w odrzucaniu doktryny moralnej Kościoła. Praktyka spowiedzi na Malcie jest kultywowana przez Kościół, ale wobec zanikania poczucia grzechu, staje się rzadsza i przeżywa kryzys. Artykuł opisuje inicjatywy duszpasterskie Kościoła na Malcie propagujące korzystanie z sakramentu pokuty. Do tych inicjatyw należą grupy duszpasterskie oraz zapewnianie możliwości spowiedzi w poszczególnych kościołach. Szczególnym okresem spowiedzi są dni poprzedzające święto Matki Bożej Bolesnej obchodzone w Wielkim Poście.
Quantum versus Classical Dynamics in Spin Models: Chains, Ladders, and Square Lattices
Creators: name: Schubert, Dennis
name: Richter, Jonas
name: Jin, Fengping
name: Michielsen, Kristel
name: De Raedt, Hans
name: Steinigeweg, Robin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present a comprehensive comparison of spin and energy dynamics in quantum and classical spin models on different geometries, ranging from one-dimensional chains, over quasi-one-dimensional ladders, to two-dimensional square lattices. Focusing on dynamics at formally infinite temperature, we particularly consider the autocorrelation functions of local densities, where the time evolution is governed either by the linear Schrödinger equation in the quantum case, or the nonlinear Hamiltonian equations of motion in the case of classical mechanics. While, in full generality, a quantitative agreement between quantum and classical dynamics can therefore not be expected, our large-scale numerical results for spin-$1/2$ systems with up to $N = 36$ lattice sites in fact defy this expectation. Specifically, we observe a remarkably good agreement for all geometries, which is best for the nonintegrable quantum models in quasi-one or two dimensions, but still satisfactory in the case of integrable chains, at least if transport properties are not dominated by the extensive number of conservation laws. Our findings indicate that classical or semi-classical simulations provide a meaningful strategy to analyze the dynamics of quantum many-body models, even in cases where the spin quantum number $S = 1/2$ is small and far away from the classical limit $S \to \infty$.
description: 11 pages, 7 figures
Prita Meier, The Surface of Things. A History of Photography from the Swahili Coast
Creators: name: Schneider, Jürg
Publisher: name: 21: Inquiries into Art, History, and the Visual
Year: 2025

description: 21: Inquiries into Art, History, and the Visual, Vol. 6 No. 1 (2025): 21: Inquiries into Art, History, and the Visual. Beiträge zur Kunstgeschichte und visuellen Kultur
The influence of diet composition and tissue taurine content on the incidence of sudden death syndrome in male broiler chickens
Creators: name: Jacob, Jacqueline Patricia
Publisher: name: University of British Columbia
Year: 2010

description: Five experiments were conducted with male broiler chickens to study the influence of diet composition on the incidence of Sudden Death Syndrome (SDS). In Experiment 1, the effects of 4 levels of dietary lactate (0, 2.5, 5.0 and 7.5% calcium lactate) and 4 levels of dietary glucose (0, 15, 30 and 45% cerelose) were studied in a factorial experiment with 1280 chicks reared in battery brooder cages to 4 weeks of age. There were no significant differences in either total mortality or mortality due to SDS. In Experiments 2, 3 and 4, the chicks were fed isocaloric and isonitrogenous diets with either corn or wheat as the grain type and meat meal or soybean meal as the main protein source. In Experiments 2 and 3, the chicks (6000 and 9600, respectively) were raised in floor pens to 6 weeks of age while in Experiment 4, the chicks (640) were reared in battery brooder cages to 4 weeks of age. SDS mortality was affected by both cereal type and protein source. Broilers fed wheat based diets had a higher incidence of SDS mortality than those fed corn based diets. The incidence of SDS was higher when meat meal was excluded from the diet. In Experiment 5, the chicks were fed diets supplemented with guanidinoethy1 sulfonate (GES), a taurine transport inhibitor in rats. At 4 weeks of age broilers receiving 1.50% dietary GES had significantly lower (p<.05) cardiac taurine concentrations, but significantly higher (p<.05) brain taurine concentrations than controls. There was no effect of GES supplementation on total mortality or the incidence of SDS.
title: Wasser- und Sanitärversorgung von Schulen und Gesundheitsstationen für exemplarische Fälle im ländlichen Raum Äthiopiens
title: Example of water and sanitation facilities for schools and health facilities in rural Ethiopia
Creators: name: Schultealbert, Susanne
Publisher: name: FH Münster
Year: 2011
Subjects: subject: 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten

description: Eine besonders von Wassermangel betroffene Region ist das Bundesland Afar im Nordosten Äthiopiens. In diesem Gebiet befindet sich das Dorf Hidmo. Mittels Geldern aus der Entwicklungshilfe hat die äthiopische Regierung dort ein Schulgebäude errichten lassen, damit die Kinder aus der Umgebung der allgemeinen Schulpflicht nachkommen können. Es wurde aber vergessen, Geld für eine Wasser-und Sanitärversorgung einzuplanen, diese wäre notwendig, da die nächste Wasserstelle 500 m weit entfernt ist. Im Rahmen dieser Arbeit soll auf Vorplanungsniveau untersucht werden, inwiefern es möglich ist, Niederschlagswasser zu speichern, welches den Schülern als Wasserquelle dient und welche Sanitärsysteme dafür in Frage kommen. Zum einen sollen diese das Ausbreiten von Krankheiten verhindern und zum anderen die knappe Ressource Wasser schonen. Zusätzlich soll versucht werden, Bewässerungswasser bereit zu stellen, zur Bewässerung eines schuleigenen Nutzgartens, der dazu dienen soll, die Kinder in sparsamen Bewässerungsmethoden zu schulen. Der Wasserspeicher soll nur Brauchwasser zum Händewaschen und zu Bewässerungszwecken liefern. Trinkwasser soll mittels einer Rohrleitung aus der vorhandenen, 500m von der Schule entfernten, Wasserquelle bezogen werden. Zur Auswahl sollen nur angepasste Technologien kommen, vorwiegend einfach gehalten, dem Prinzip der Kreislaufwirtschaft nahekommend.
description: A model water and sanitation concept was developed for being used in a primary school of the village of Hidmo in the arid Ethiopian Province of Afar.
Probing the spin correlations of $t\bar t $ production at NLO QCD+EW
Creators: name: Frederix, Rikkert
name: Tsinikos, Ioannis
name: Vitos, Timea
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this work we investigate the NLO QCD+EW corrections to the top quark pair production and their effects on the spin correlation coefficients and asymmetries at fixed-order top quark pair production and LO decay in the dilepton channel, within the narrow-width approximation. The spin correlations are implicitly measured through the lepton kinematics. Moreover we study the EW effects to the leptonic differential distributions. We find that the EW corrections to the $t \bar t$ production are within the NLO QCD theoretical uncertainties for the spin correlation coefficients and the leptonic asymmetries. On the other hand, for the differential distributions we find that the EW corrections exceed the NLO QCD scale uncertainty band in the high rapidity regimes and are of the order of the NLO QCD scale uncertainty in the case of invariant mass and transverse momentum distributions.
description: 16 pages, 3 figures, 4 tables
Substrate temperature changes during MBE growth of GaMnAs
Creators: name: Novak, V.
name: Olejnik, K.
name: Cukr, M.
name: Smrcka, L.
name: Remes, Z.
name: Oswald, J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Remarkably big increase of the substrate temperature during the low-temperature MBE growth of GaMnAs layers is observed by means of band gap spectroscopy. It is explained and simulated in terms of changes in the absorption/emission characteristics of the growing layer. Options for the temperature variation damping are discussed.
description: 5 pages, 5 figures Submitted to Journal of Applied Physics
Deep variational quantum eigensolver for excited states and its application to quantum chemistry calculation of periodic materials
Creators: name: Mizuta, Kaoru
name: Fujii, Mikiya
name: Fujii, Shigeki
name: Ichikawa, Kazuhide
name: Imamura, Yutaka
name: Okuno, Yukihiro
name: Nakagawa, Yuya O.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A programmable quantum device that has a large number of qubits without fault-tolerance has emerged recently. Variational Quantum Eigensolver (VQE) is one of the most promising ways to utilize the computational power of such devices to solve problems in condensed matter physics and quantum chemistry. As the size of the current quantum devices is still not large for rivaling classical computers at solving practical problems, Fujii et al. proposed a method called "Deep VQE" which can provide the ground state of a given quantum system with the smaller number of qubits by combining the VQE and the technique of coarse-graining [K. Fujii, et al, arXiv:2007.10917]. In this paper, we extend the original proposal of Deep VQE to obtain the excited states and apply it to quantum chemistry calculation of a periodic material, which is one of the most impactful applications of the VQE. We first propose a modified scheme to construct quantum states for coarse-graining in Deep VQE to obtain the excited states. We also present a method to avoid a problem of meaningless eigenvalues in the original Deep VQE without restricting variational quantum states. Finally, we classically simulate our modified Deep VQE for quantum chemistry calculation of a periodic hydrogen chain as a typical periodic material. Our method reproduces the ground-state energy and the first-excited-state energy with the errors up to O(1)% despite the decrease in the number of qubits required for the calculation by two or four compared with the naive VQE. Our result will serve as a beacon for tackling quantum chemistry problems with classically-intractable sizes by smaller quantum devices in the near future.
description: 18 pages, 5 figures
Time-encoded mid-infrared Fourier-domain optical coherence tomography
Creators: name: Zorin, Ivan
name: Gattinger, Paul
name: Prylepa, Andrii
name: Heise, Bettina
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We report on a technically simple approach to achieve high-resolution and high-sensitivity Fourier-domain OCT imaging in the mid-infrared range. The proposed OCT system employs an InF3 supercontinuum source. A specially designed dispersive scanning spectrometer based on a single InAsSb point detector is employed for detection. The spectrometer enables structural OCT imaging in the spectral range from 3140 nm to 4190 nm with a characteristic sensitivity of over 80 dB and an axial resolution below 8 um. The capabilities of the system are demonstrated for imaging of porous ceramic samples and transition-stage green parts fabricated using an emerging method of lithography-based ceramic manufacturing. Additionally, we demonstrate the performance and flexibility of the system by OCT imaging using an inexpensive low-power (average power of 16 mW above 3 um wavelength) mid-IR supercontinuum source.
description: 6 pages, 5 figures
Burcu Dogramaci and Marta Smolińska, Grenze/Granica. Art on the German-Polish Border after 1990
Creators: name: Faber, Vera
Publisher: name: 21: Inquiries into Art, History, and the Visual
Year: 2025

description: 21: Inquiries into Art, History, and the Visual, Vol. 6 No. 1 (2025): 21: Inquiries into Art, History, and the Visual. Beiträge zur Kunstgeschichte und visuellen Kultur
Subnanosecond switching of local spin-exchange coupled to ferromagnets
Creators: name: Fransson, J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The dynamics of a single spin embedded in a the tunnel junction between ferromagnetic contacts is strongly affected by the exchange coupling to the tunneling electrons. Using time-dependent equation of motion for the spin under influence of the spin-polarized tunneling current, it is shown that the magnetic field induced by bias voltage pulses allows for sub-nanosecond switching of the local spin and the possibility of spin reversal is illustrated. Furthermore, it is shown that the time-evolution of the Larmor frequency sharply peaks around the spin-flip event, and it is argued that this feature can be used as an indicator for the spin-flip.
description: 5 pages, 3 figures
Investigating high energy proton proton collisions with a multi-phase transport model approach based on PYTHIA8 initial conditions
Creators: name: Zheng, Liang
name: Zhang, Guang-Hui
name: Liu, Yun-Fan
name: Lin, Zi-Wei
name: Shou, Qi-Ye
name: Yin, Zhong-Bao
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The striking resemblance of high multiplicity proton-proton (pp) collisions at the LHC to heavy ion collisions challenges our conventional wisdom on the formation of the Quark-Gluon Plasma (QGP). A consistent explanation of the collectivity phenomena in pp will help us to understand the mechanism that leads to the QGP-like signals in small systems. In this study, we introduce a transport model approach connecting the initial conditions provided by PYTHIA8 with subsequent AMPT rescatterings to study the collective behavior in high energy pp collisions. The multiplicity dependence of light hadron productions from this model is in reasonable agreement with the pp $\sqrt{s}=13$ TeV experimental data. It is found in the comparisons that both the partonic and hadronic final state interactions are important for the generation of the radial flow feature of the pp transverse momentum spectra. The study also shows that the long range two particle azimuthal correlation in high multiplicity pp events is sensitive to the proton sub-nucleon spatial fluctuations.
Bubbles with attached quantum vortices in trapped binary Bose-Einstein condensates
Creators: name: Ruban, Victor P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Pattern Formation and Solitons (nlin.PS)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Specific topological excitations of energetically stable "core-and-mantle" configurations of trapped two-component immiscible Bose-Einstein condensates are studied numerically within the coupled Gross-Pitaevskii equations. Non-stationary long-lived coherent structures, that consist of several quantum vortex filaments penetrating the "mantle" from outside to inside and vice-versa and demonstrate quite nontrivial dynamics, are observed in simulations for the first time. The ends of filaments can remain attached to the interface between the "mantle" and the "core" if the latter is large enough while the surface tension is not small. The shapes of such "bubbles" are strongly affected by the vortices and sometimes are far from being spherical.
description: revtex, 6 pages, 20 figures, accepted for publication in JETP
Testing the gamma-ray burst variability/peak luminosity correlation on a Swift homogeneous sample
Creators: name: Rizzuto, D.
name: Guidorzi, C.
name: Romano, P.
name: Covino, S.
name: Campana, S.
name: Capalbi, M.
name: Chincarini, G.
name: Cusumano, G.
name: Fugazza, D.
name: Mangano, V.
name: Moretti, A.
name: Perri, M.
name: Tagliaferri, G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We test the gamma-ray burst correlation between temporal variability and peak luminosity of the $γ$-ray profile on a homogeneous sample of 36 Swift/BAT GRBs with firm redshift determination. This is the first time that this correlation can be tested on a homogeneous data sample. The correlation is confirmed, as long as the 6 GRBs with low luminosity (<5x10^{50} erg s^{-1} in the rest-frame 100-1000 keV energy band) are ignored. We confirm that the considerable scatter of the correlation already known is not due to the combination of data from different instruments with different energy bands, but it is intrinsic to the correlation itself. Thanks to the unprecedented sensitivity of Swift/BAT, the variability/peak luminosity correlation is tested on low-luminosity GRBs. Our results show that these GRBs are definite outliers.
description: Accepted for Publication in MNRAS. 10 pages, 5 figures, 3 tables
Honest-but-Curious Nets: Sensitive Attributes of Private Inputs Can Be Secretly Coded into the Classifiers' Outputs
Creators: name: Malekzadeh, Mohammad
name: Borovykh, Anastasia
name: Gündüz, Deniz
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: It is known that deep neural networks, trained for the classification of non-sensitive target attributes, can reveal sensitive attributes of their input data through internal representations extracted by the classifier. We take a step forward and show that deep classifiers can be trained to secretly encode a sensitive attribute of their input data into the classifier's outputs for the target attribute, at inference time. Our proposed attack works even if users have a full white-box view of the classifier, can keep all internal representations hidden, and only release the classifier's estimations for the target attribute. We introduce an information-theoretical formulation for such attacks and present efficient empirical implementations for training honest-but-curious (HBC) classifiers: classifiers that can be accurate in predicting their target attribute, but can also exploit their outputs to secretly encode a sensitive attribute. Our work highlights a vulnerability that can be exploited by malicious machine learning service providers to attack their user's privacy in several seemingly safe scenarios; such as encrypted inferences, computations at the edge, or private knowledge distillation. Experimental results on several attributes in two face-image datasets show that a semi-trusted server can train classifiers that are not only perfectly honest but also accurately curious. We conclude by showing the difficulties in distinguishing between standard and HBC classifiers, discussing challenges in defending against this vulnerability of deep classifiers, and enumerating related open directions for future studies.
description: In Proceedings of the 2021 ACMSIGSAC Conference on Computer and Communications Security (CCS '21)
Camouflaged galactic CMB foregrounds: total and polarized contributions of the kinetic Sunyaev Zeldovich effect
Creators: name: Waelkens, A.
name: Maturi, M.
name: Ensslin, T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We consider the role of the galactic kinetic Sunyaev Zeldovich (SZ) effect as a CMB foreground. While the galactic thermal Sunyaev Zeldovich effect has previously been studied and discarded as a potential CMB foreground, we find that the kinetic SZ effect is dominant in the galactic case. We analyse the detectability of the kinetic SZ effect by means of an optimally matched filter technique applied to a simulation of an ideal observation. We obtain no detection, getting a S/N ratio of 0.1, thereby demonstrating that the kinetic SZ effect can also safely be ignored as a CMB foreground. However we provide maps of the expected signal for inclusion in future high precision data processing. Furthermore, we rule out the significant contamination of the polarised CMB signal by second scattering of galactic kinetic Sunyaev-Zeldovich photons, since we show that the scattering of the CMB quadrupole photons by galactic electrons is a stronger effect than the Sunyaev Zeldovich second scattering, and has already been shown to produce no significant polarised contamination. We confirm the latter assessment also by means of an optimally matched filter.
description: 9 pages, 6 figures, 2 tables. submitted
Charge-density-wave-induced bands renormalization and energy gaps in a kagome superconductor RbV3Sb5
Creators: name: Liu, Zhonghao
name: Zhao, Ningning
name: Yin, Qiangwei
name: Gong, Chunsheng
name: Tu, Zhijun
name: Li, Man
name: Song, Wenhua
name: Liu, Zhengtai
name: Shen, Dawei
name: Huang, Yaobo
name: Liu, Kai
name: Lei, Hechang
name: Wang, Shancai
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Recently discovered Z2 topological kagome metals AV3Sb5 (A = K, Rb, and Cs) exhibit charge density wave (CDW) phases and novel superconducting paring states, providing a versatile platform for studying the interplay between electron correlation and quantum orders. Here we directly visualize CDW-induced bands renormalization and energy gaps in RbV3Sb5 using angle-resolved photoemission spectroscopy, pointing to the key role of tuning van Hove singularities to the Fermi energy in mechanisms of ordering phases. Near the CDW transition temperature, the bands around the Brillouin zone (BZ) boundary are shifted to high-binding energy, forming an "M"-shape band with singularities near the Fermi energy. The Fermi surfaces are partially gapped and the electronic states on the residual ones should be possibly dedicated to the superconductivity. Our findings are significant in understanding CDW formation and its associated superconductivity.
Hochschild cohomology, the characteristic morphism and derived deformations
Creators: name: Lowen, Wendy
Publisher: name: arXiv
Year: 2007
Subjects: subject: K-Theory and Homology (math.KT)
subject: FOS: Mathematics
subject: 18G60; 13D10

description: A notion of Hochschild cohomology of an abelian category was defined by Lowen and Van den Bergh (2005) and they showed the existence of a characteristic morphism from the Hochschild cohomology into the graded centre of the (bounded) derived category. An element in the second Hochschild cohomology group corresponds to a first order deformation of the abelian category (Lowen and Van den Bergh, 2006). The problem of deforming single objects of the bounded derived category was treated by Lowen (2005). In this paper we show that the image of the Hochschild cohomology element under the characteristic morphism encodes precisely the obstructions to deforming single objects of the bounded derived category. Hence this paper provides a missing link between the above works. Finally we discuss some implications of these facts in the direction of a ``derived deformation theory''.
description: 24 pages
Reentrance effect in a graphene n-p-n junction coupled to a superconductor
Creators: name: Ossipov, A.
name: Titov, M.
name: Beenakker, C. W. J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We study the interplay of Klein tunneling (= interband tunneling) between n-doped and p-doped regions in graphene and Andreev reflection (= electron-hole conversion) at a superconducting electrode. The tunneling conductance of an n-p-n junction initially increases upon lowering the temperature, while the coherence time of the electron-hole pairs is still less than their lifetime, but then drops back again when the coherence time exceeds the lifetime. This reentrance effect, known from diffusive conductors and ballistic quantum dots, provides a method to detect phase coherent Klein tunneling of electron-hole pairs.
description: 4 pages, 3 figures
Method and System for Authorization and Access to Protected Resources
Creators: name: Beznoso, Konstantin
name: Carter, Jennifer
name: Mwaura, James
name: Nguyen, Hieu
Publisher: name: Zenodo
Year: 2005
Subjects: RAD
CORBA
authorization caching
Engineering Security Mechanisms

description: The present invention relates to the access of data resources using a Resource Access Decision Facility (RAD), preferably a CORBA RAD. More particularly, embodiments of the present invention provide enhancements to a RAD that allow additional query capabilities and faster resource access.
Generalized adiabatic approximation to the quantum Rabi model
Creators: name: Li, Zi-Min
name: Batchelor, Murray T.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The quantum Rabi model (QRM) describes the interaction between a two-level system (qubit) and a quantum harmonic oscillator. In the limit where the qubit frequency is smaller than the harmonic frequency, the QRM can be well approximated by the adiabatic approximation (AA). The AA is widely used due to its simplicity and explicit physical interpretation. However, the level crossings in the spectrum of the QRM predicted by the AA are determined by the zeros of Laguerre polynomials, which deviate from the exact points. We propose a new approximation to the QRM that predicts the level crossings correctly. This is done by exploiting a surprising connection between isolated exact solutions to the QRM and the Laguerre polynomials in the AA. We thus refer to this approach as the generalized adiabatic approximation (GAA). By construction, the GAA always predicts the exact exceptional spectrum and approximates the regular spectrum remarkably well in a much larger parameter regime than the AA. This generalized approach offers a framework to deal with the family of Rabi-type light-matter interaction models in a simple but accurate manner.
description: Accepted version, to appear in PRA
Supercritical geometric optics for nonlinear Schrodinger equations
Creators: name: Alazard, Thomas
name: Carles, Rémi
Publisher: name: arXiv
Year: 2007
Subjects: subject: Analysis of PDEs (math.AP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We consider the small time semi-classical limit for nonlinear Schrodinger equations with defocusing, smooth, nonlinearity. For a super-cubic nonlinearity, the limiting system is not directly hyperbolic, due to the presence of vacuum. To overcome this issue, we introduce new unknown functions, which are defined nonlinearly in terms of the wave function itself. This approach provides a local version of the modulated energy functional introduced by Y.Brenier. The system we obtain is hyperbolic symmetric, and the justification of WKB analysis follows.
description: 29 pages. Some typos fixed
Model investigations of the correlation between the mean transverse momentum and anisotropic flow in shape-engineered events
Creators: name: Magdy, Niseem
name: Lacey, Roy A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The correlation between the event mean-transverse momentum $[p_{\mathrm{T}}]$, and the anisotropic flow magnitude $v_n$, $ρ(v^{2}_{n},[p_{T}])$, has been argued to be sensitive to the initial conditions in heavy-ion collisions. We use simulated events generated with the AMPT and EPOS models for Au+Au at $\sqrt{\textit{s}_{NN}}$ = 200 GeV, to investigate the model dependence and the response and sensitivity of the $ρ(v^{2}_{2},[p_{T}])$ correlator to collision-system size and shape, and the viscosity of the matter produced in the collisions. We find good qualitative agreement between the correlators for the string melting version of the AMPT model and the EPOS model. The model investigations for shape-engineered events as well as events with different viscosity ($η/s$), indicate that $ρ(v^{2}_{2},[p_{T}])$ is sensitive to the initial-state geometry of the collision system but is insensitive to sizable changes in $η/s$ for the medium produced in the collisions. These findings suggest that precise differential measurements of $ρ(v^{2}_{2},[p_{T}])$ as a function of system size, shape, and beam-energy could provide more stringent constraints to discern between initial-state models and hence, more reliable extractions of $η/s$.
description: 8 pages, 6 figures
All Things Foreign, All Things Strange
Creators: name: Radny, Kacper
Publisher: name: 21: Inquiries into Art, History, and the Visual
Year: 2025

description: 21: Inquiries into Art, History, and the Visual, Vol. 6 No. 1 (2025): 21: Inquiries into Art, History, and the Visual. Beiträge zur Kunstgeschichte und visuellen Kultur
"For Us By Us": Intentionally Designing Technology for Lived Black Experiences
Creators: name: Egede, Lisa
name: Coney, Leslie
name: Johnson, Brittany
name: Harrington, Christina N.
name: Ford, Denae
Publisher: name: arXiv
Year: 2024
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: HCI research to date has only scratched the surface of the unique approaches racially minoritized communities take to building, designing, and using technology systems. While there has been an increase in understanding how people across racial groups create community across different platforms, there is still a lack of studies that explicitly center on how Black technologists design with and for their own communities. In this paper, we present findings from a series of semi-structured interviews with Black technologists who have used, created, or curated resources to support lived Black experiences. From their experiences, we find a multifaceted approach to design as a means of survival, to stay connected, for cultural significance, and to bask in celebratory joy. Further, we provide considerations that emphasize the need for centering lived Black experiences in design and share approaches that can empower the broader research community to conduct further inquiries into design focused on those in the margins.
description: 15 pages, 2 tables
Middleware and Web Services Security
Creators: name: Beznosov, Konstantin
Publisher: name: Zenodo
Year: 2005
Subjects: middleware security
Web services security
EJB
COM+
CORBA
Engineering Security Mechanisms

description: Challenges of designing secure distributed applications are due to distribution, scale and object orientation. We will discuss the functionalities and capabilities of the security mechanisms of today middleware and web services technologies, such as EJB, COM+, and ASP.NET, that allow addressing these challenges.
Effective GUP-modified Raychaudhuri equation and black hole singularity: four models
Creators: name: Blanchette, Keagan
name: Das, Saurya
name: Rastgoo, Saeed
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The classical Raychaudhuri equation predicts the formation of conjugate points for a congruence of geodesics, in a finite proper time. This in conjunction with the Hawking-Penrose singularity theorems predicts the incompleteness of geodesics and thereby the singular nature of practically all spacetimes. We compute the generic corrections to the Raychaudhuri equation in the interior of a Schwarzschild black hole, arising from modifications to the algebra inspired by the generalized uncertainty principle (GUP) theories. Then we study four specific models of GUP, compute their effective dynamics as well as their expansion and its rate of change using the Raychaudhuri equation. We show that the modification from GUP in two of these models, where such modifications are dependent of the configuration variables, lead to finite Kretchmann scalar, expansion and its rate, hence implying the resolution of the singularity. However, the other two models for which the modifications depend on the momenta still retain their singularities even in the effective regime.
description: 26 pages, 6 figures; v2: matches JHEP published version
Supersymmetry breaking by constant superpotentials and O'Raifeartaigh model in warped space
Creators: name: Uekusa, Nobuhiro
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Supersymmetry breaking together by constant boundary superpotentials and by the O'Raifeartaigh model is studied in a warped space model. It is shown that the contribution of constant boundary superpotentials enables the moduli of chiral supermultiplets to be stabilized and that the vacuum at the stationary point has zero cosmological constant in a wide region of parameters.
description: 13 pages, sections restructured, typos corrected
The Behavioral Diversity of Java JSON Libraries
Creators: name: Harrand, Nicolas
name: Durieux, Thomas
name: Broman, David
name: Baudry, Benoit
Publisher: name: arXiv
Year: 2021
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: JSON is an essential file and data format in do-mains that span scientific computing, web APIs or configuration management. Its popularity has motivated significant software development effort to build multiple libraries to process JSON data. Previous studies focus on performance comparison among these libraries and lack a software engineering perspective.We present the first systematic analysis and comparison of the input / output behavior of 20 JSON libraries, in a single software ecosystem: Java/Maven. We assess behavior diversity by running each library against a curated set of 473 JSON files, including both well-formed and ill-formed files. The main design differences, which influence the behavior of the libraries, relate to the choice of data structure to represent JSON objects and to the encoding of numbers. We observe a remarkable behavioral diversity with ill-formed files, or corner cases such as large numbers or duplicate data. Our unique behavioral assessment of JSON libraries paves the way for a robust processing of ill-formed files, through a multi-version architecture.
Daniel Seelbach, Der Herrscher im Massenmedium. Fränkische Bildpolitik auf Münzen und Siegeln im Kulturvergleich
Creators: name: Coupland, Simon
Publisher: name: 21: Inquiries into Art, History, and the Visual
Year: 2025

description: 21: Inquiries into Art, History, and the Visual, Vol. 6 No. 1 (2025): 21: Inquiries into Art, History, and the Visual. Beiträge zur Kunstgeschichte und visuellen Kultur
title: Self-regulated Cooperative EFL Reading Tasks: Students’ Strategy Use and Teachers’ Support
Creators: name: Finkbeiner, Claudia
name: Knierim, Markus
name: Smasal, Marc
name: Ludwig, Peter H.
Publisher: name: Universität Kassel
Year: 2012
Subjects: subject: 420
subject: Fremdsprachenunterricht
subject: Englisch
subject: Lerntechnik
subject: Sprachbewusstsein

description: Project title: "Fostering the situationally adequate use of learning strategies in self-regulated, text-based learning environments in the English as a Foreign Language (EFL) classroom". Principal investigators: Prof. Dr. Claudia Finkbeiner, University of Kassel (Germany) and Prof. Dr. Peter H. Ludwig, University of Koblenz-Landau (Germany). This is an Accepted Manuscript of an article published by Taylor & Francis in "langauge Awarenesss" on 11 April 2012, available online: https://www.tandfonline.com/doi/full/10.1080/09658416.2011.639892
description: Funded by grants from the German Research Foundation (Deutsche Forschungsgemeinschaft – DFG; grant no. FI 684/13–1, FI 684/13–2
title: Early-Career Marketing Practitioner Experiences of Ethics: Implications for Ethics Education
Creators: name: Peleg, A
Publisher: name: London South Bank University
Year: 2018

description: n the wake of recent global scandals and criticism of unethical practice in business and
marketing, there are calls for universities to put greater emphasis on ethics and social
education. Numerous academic and practical studies debate issues of the purpose and
delivery and evaluate impact of ethics interventions on university students. Extensive
management research reveals factors influencing practitioner ethical behaviour,
however, the ethical experiences of practitioners in the early stages of their careers
and the impact of ethics education is under-researched.
The aim of this research is to understand how early-career marketing practitioners
experience ethical issues in the workplace and to explore their attitudes towards ethics
education and training. Qualitative in-depth interviews with London South Bank
University marketing graduates explore these experiences.
This research makes several contributions to academic knowledge. It highlights the
new and important insight offered by early-career practitioners to the ethics education
debate. It emphasises the importance of ethics education as a preparation for the
workplace and demonstrates that ethics interventions develop ethical consciousness.
Importantly, it suggests a new approach to the purpose and delivery of ethics
education which combines cognitive, affective and conative interventions across the
curriculum. Finally, the research identifies the important role of internal relations and
job satisfaction in developing ethical behaviour, trust and reputation and thereby
reinforces the importance of organisational culture in decision making.
Recommendations for ethics education practice focus on fundamental changes across
the university marketing and business subject area where ethical considerations
become part of decision making criteria, supported by a committed organisational
culture. This is to be delivered through practical content which stimulates rational
thinking, sensitivity, reflection, and action embedded across the curriculum and in
workplace training interventions.