cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Thomas Steitz - Bibliography from THOMAS ARTHUR STEITZ 23 August 1940 — 9 October 2018 Elected ForMemRS 2011
Creators: name: Ramakrishnan, V.
name: Henderson, Richard
Publisher: name: The Royal Society
Year: 2021
Subjects: Structural Biology

description: Thomas A. Steitz was among the foremost of the generation that was responsible for an explosion in our understanding of the structure and function of biological macromolecules. His research career was one of sustained excellence over six decades, and spanned the range from determining the structures of important metabolic enzymes to understanding the structural basis of how genetic information residing in our DNA is used to make the proteins they encode. This latter effort culminated in the structure of the ribosome, for which he shared the Nobel Prize in Chemistry in 2009.
Local transfer and spectra of a diffusive field advected by large-scale incompressible flows
Creators: name: Tran, Chuong V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: This study revisits the problem of advective transfer and spectra of a diffusive scalar field in large-scale incompressible flows in the presence of a (large-scale) source. By ``large-scale'' it is meant that the spectral support of the flows is confined to the wave-number region $kk_d$ is bounded from above by $Uk_dkΘ(k,t)$, where $U$ denotes the maximum fluid velocity and $Θ(k,t)$ is the spectrum of the scalar variance, defined as its average over the shell $(k-k_d,k+k_d)$. For a given flux, say $\vartheta>0$, across $k>k_d$, this bound requires $$Θ(k,t)\ge \frac{\vartheta}{Uk_d}k^{-1}.$$ This is consistent with recent numerical studies and with Batchelor's theory that predicts a $k^{-1}$ spectrum (with a slightly different proportionality constant) for the viscous-convective range, which could be identified with $(k_d,k_κ)$. Thus, Batchelor's formula for the variance spectrum is recovered by the present method in the form of a critical lower bound. The present result applies to a broad range of large-scale advection problems in space dimensions $\ge2$, including some filter models of turbulence, for which the turbulent velocity field is advected by a smoothed version of itself. For this case, $Θ(k,t)$ and $\vartheta$ are the kinetic energy spectrum and flux, respectively.
description: 6 journal pages, 1 "cartoon" figure, to appear in PRE
B, Bs -> K form factors: an update of light-cone sum rule results
Creators: name: Duplancic, G.
name: Melic, B.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present an improved QCD light-cone sum rule (LCSR) calculation of the B -> K and Bs -> K form factors, by including SU(3)-symmetry breaking corrections. We use recently updated K-meson distribution amplitudes which incorporate the complete SU(3)-breaking structure. By applying the method of the direct integration in the complex plane, which is presented in a detail, the analytical extraction of the imaginary parts of LCSR hard-scattering amplitudes becomes unnecessary and therefore the complexity of the calculation is greatly reduced. The values obtained for the relevant B_{(s)} -> K form factors are as follows: f^+_{BK}(0)= 0.36^{+0.05}_{-0.04}, f^+_{B_sK}(0)= 0.30^{+0.04}_{-0.03} and f^T_{BK}(0)= 0.38\pm 0.05, f^T_{B_sK}(0)= 0.30\pm 0.05. By comparing with the B -> pi form factors extracted recently by the same method, we find the following SU(3) violation among the B -> light form factors: f^+_{BK}(0)/f^+_{Bπ}(0) = 1.38^{+0.11}_{-0.10}, f^+_{B_sK}(0)/f^+_{Bπ}(0) = 1.15^{+0.17}_{-0.09}, f^T_{BK}(0)/f^T_{Bπ}(0) = 1.49^{+0.18}_{-0.06} and f^T_{B_sK}(0)/f^T_{Bπ}(0) = 1.17^{+0.15}_{-0.11}.
description: 14 pages, 9 figures, some figures and discussions added; version to appear in PRD
Black holes thermodynamics to all orders in the Planck length in extra dimensions
Creators: name: Nouicer, Khireddine
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigate the effects to all orders in the Planck length, from a generalized uncertainty principle, on the thermodynamic parameters of radiating Schwarzschild black holes in a scenario with large extra dimesions. We show that black holes in this framework are hotter, decay faster and are less classical objects. Particularly, we show that the final stage of the radiation process is a black hole remnant with zero entropy, zero heat capacity and non zero finite temperature. We finally compare our results with the ones obtained in the standard Hawking picture and with the generalized uncertainty principle to leading order in the Planck length.
description: 21 pages, 6 figures, 1 table; Figure 2 replaced and section 4 improved
Full counting statistics of spin transfer through ultrasmall quantum dots
Creators: name: Schmidt, T. L.
name: Komnik, A.
name: Gogolin, A. O.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We analyze the spin-resolved full counting statistics of electron transfer through an ultrasmall quantum dot coupled to metallic electrodes. Modelling the setup by the Anderson Hamiltonian, we explicitly take into account the onsite Coulomb repulsion $U$. We calculate the cumulant generating function for the probability to transfer a certain number of electrons with a preselected spin orientation during a fixed time interval. With the cumulant generating function at hand we are then able to calculate the spin current correlations which are of outmost importance in the emerging field of spintronics. We confirm the existing results for the charge statistics and report the discovery of the new type of correlation between the spin-up and -down polarized electrons flows, which has a potential to become a powerful new instrument for the investigation of the Kondo effect in nanostructures.
description: 5 pages, 1 figure
From holography to the geometry of the spacetime
Creators: name: Pelegrín, José A. S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences
subject: 53C80, 58J05, 53C50

description: We show the geometric consequences that the holographic principle has on the spacetime. Namely, we prove that complete spacelike hypersurfaces in a spacetime that satisfies the holographic principle are non-parabolic. This has important consequences on the behaviour of the Brownian motion in these spacelike hypersurfaces, as well as provides a method for finding examples of universes that lead to a violation of this principle.
description: Preprint of an article published in International Journal of Geometric Methods in Modern Physics, 16 (2019), 1950010 (1-11), which can be found at https://doi.org/10.1142/S0219887819500105
Radio-frequency induced ground state degeneracy in a Chromium Bose-Einstein condensate
Creators: name: Beaufils, Q.
name: Zanon, T.
name: Chicireanu, R.
name: Laburthe-Tolra, B.
name: Marechal, E.
name: Vernac, L.
name: Keller, J. -C.
name: Gorceix, O.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the effect of strong radio-frequency (rf) fields on a chromium Bose-Einstein condensate (BEC), in a regime where the rf frequency is much larger than the Larmor frequency. We use the modification of the Landé factor by the rf field to bring all Zeeman states to degeneracy, despite the presence of a static magnetic field of up to 100 mG. This is demonstrated by analyzing the trajectories of the atoms under the influence of dressed magnetic potentials in the strong field regime. We investigate the problem of adiabaticity of the rf dressing process, and relate it to how close the dressed states are to degeneracy. Finally, we measure the lifetime of the rf dressed BECs, and identify a new rf-assisted two-body loss process induced by dipole-dipole interactions.
description: 4 pages, 4 figures
Model Independent Tests for Time Reversal and CP Violations and for CPT Theorem in Λ_b and \barΛ_b Two Body Decays
Creators: name: Di Salvo, E.
name: Ajaltouni, Z. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Weak decays of beauty baryons like Λ_b (\barΛ_b) into Λ(\barΛ) and V (J^P = 1^-), where both decay products are polarized, offer interesting opportunities to perform tests of time reversal and CP violations and of CPT invariance. We propose a model independent parametrization of the angular distribution and of the polarization of the final resonances, by means of the spin density matrix. The transverse component of the polarization is sensitive to time reversal violations, moreover CP-and CPT-sensitive observables are defined.
description: 14 pages
Vorgehensweise zur Bearbeitung von NB-IoT-Störungen : Erstellung einer Schulungsunterlage
Creators: name: Kubitschke, Jonas
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2021
Subjects: subject: Messtechnik
subject: Störungen
subject: Signalstärken
subject: Signalmessung
subject: Signal
subject: DDC::6** Technik, Medizin, angewandte Wissenschaften::60* Technik::600 Technik, Technologie

description: Für eine konkrete und ausreichende Störungsbearbeitung der BNetzA, ist es entscheidend, dass die vorhandenen HF-Messgeräte dem zu messenden Signalen entspricht. Es soll geprüft werden, ob die aktuell verfügbare HF-Messtechnik der BNetzA ausreicht, um in einem Störungsfall im NB-IoT korrekt zu bearbeiten. Für die Überprüfung wurden Vergleichsmessungen im Mobilfunknetz der Deutschen Telekom und von Vodafone durchgeführt. Es wurden unter verschiedenen Bedingungen mit einem NB-IoT-Messmodul die NB-IoT-Signale und mit einem NEMO-Handy die LTE- Signale detektiert. Die Messungen fanden unter anderem im Untergeschoss und in einer Schirmkabine statt. Durch verschiedene Öffnungszustände der Schirmkabinentür konnte die Abschirmung variiert und unterschiedliche Signalstärken erzielt werden, bis hin zum kompletten Verlust der Signale. Die Messungen wurden mit einem Spektrumanalysator (FSP) und einem Realtime Spectrumanalyzer (RSA) begleitet, um unterschiedliche Blicke auf die LTE- und NB-IoT- Signale zu erlangen. Durch die Messungen konnte festgestellt werden, dass die aktuell vorhandene HF-Messtechnik der Bundesnetzagentur nicht voll ausreichend ist, um derzeit eine korrekte und vollumfängliche Störungsbearbeitung durchzuführen. Außerdem ist es mit der zur Verfügung stehenden HFMesstechnik nicht möglich die NB-IoT. Signale auszulesen.
Vergleich von Vorverstärkerschaltungen in Röhren- und Transistorbauweise für den Einsatz in Audioverstärkern
Creators: name: Engelmann, Finn
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2022
Subjects: subject: Schaltungen
subject: Audioverstärker
subject: Transistor
subject: DDC::6** Technik, Medizin, angewandte Wissenschaften::62* Ingenieurwissenschaften

description: Im Rahmen dieser Bachelorarbeit wurden Röhren- und Transistorvorverstärker ausgehend von ihren Grundschaltungen zur Spannungsverstärkung im Kontext von Audio Vorverstärkung verglichen. Dabei hat sich theoretisch und praktisch im ersten Schritt gezeigt, dass die Elektronenröhre aufgrund ihrer Kennlinie ein deutlich lineareres als der Bipolartransistor oder der Mosfet ist. Es wurde eine Herleitung der harmonischen Verzerrungen sowohl für die Triode, den Mosfet als auch den Bipolartransistor durchgeführt, die die für die Höhe der Verzerrungen maßgeblichen Größen aufzeugt. Dabei wurde in erster Linie deutlich, dass die rein kennlinienbedingten Verzerrungen des Bipolartransistors in ihrer Größe völlig unabhängig vom Arbeitspunkt auftreten, vorausgesetzt er arbeitet im Normalbetrieb (Forward region). Für den Mosfet und die Elektronenröhre zeigt sich das Verzerrungsverhalten sowohl Bauteil- als auch arbeitspunktabhängig. Im nächsten Schritt wurden alle Bauteile durch eine Stromgegenkopplung bei einem gleichen Verstärkungsfaktor betrieben. Hierbei hat sich gezeigt, dass die linearisierende Wirkung der Gegenkopplung zwar bei harmonischen Verzerrungen und Intermodulationsverzerrungen niedriger Ordnung eine enorme Verbesserung bewirkt, bei Verzerrungen und Intermodulationsprodukten höherer Ordnung aber deutlich weniger wirksam ist. Es hat sich im Vergleich außerdem gezeigt, dass die geringen Gesamtverzerrungen der Elektronenröhre in einer einstufigen Verstärkerschaltung von Bipolartransistor und Mosfet nicht ohne Weiteres erreicht werden können. Diese Erkenntnisse erklären, warum auch einfache Röhrenverstärker, die auf den von Barkhausen in den 1930er-Jahren verfassten Grundschaltungen basieren, klanglich überzeugen können. Weiterhin ermöglichen die Ergebnisse dieser Arbeit einen Ausblick darauf, welche Schaltungsaspekte zukünftig genauerer Analyse bedürfen, damit auch komplexere und mehrstufige Verstärkerschaltungen genauer beurteilt werden können.
Polycarpa insulsa Sluiter 1898
Creators: name: Monniot, Françoise
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Ascidiacea
Pleurogona
Styelidae
Polycarpa
Polycarpa insulsa

description: Polycarpa insulsa (Sluiter, 1898)
(Figure 15A)
 Styela (Polycarpa) insulsa Sluiter, 1898: 14, Antilles. Polycarpa insulsa: Monniot C.:1987: 294, New Caledonia, and synonymy; Monniot et al 2001: 93 figs 46,4H, South Africa; Monniot F.& Monniot C.: 2003:701.
 Material. Indonesia. West Papua, Gam Island, Danau Nine Gam marine lake, 00°26.970’S – 130°29.149’E, 0.5m, 02/XII/2007, coll. L.J. Bell and L.E. Martin, DNG 0 0 2 (MNHN S1 POL.B 549). Malaysia, Sabah, Kota Kinabalu, Sutera marine boat harbour 05°58.08’N – 116°03.34’E, 1m, 16/VIII/2005, coll. Coral Reef Research Foundation, OCDN 9122 Y (MNHN S1 POL.B 521).
Specimens from Martinique and New Caledonia have been re-examined in comparison with the animals from Indonesia and they are very similar. At Raja Ampat the individuals may reach 15cm, they are covered with many types of epibionts (Fig. 15A). The tunic is hard and brown. The dark internal layer of the siphons has pale yellow stripes. The body wall is thick. The dorsal tubercle is complex, inside a deep curve of the peripharyngeal band. Small papillae lie on the imperforated tissue anterior to the branchial stigmata. About 25 to 28 longitudinal vessels constitute the folds, 8 to 10 are between them. The short stigmata are not crossed by parastigmatic vessels. The gut occupies the posterior part of the left body side. The stomach is wide with an oesophageal diverticulum. There is no caecum but a wide bridge crossing the primary intestinal loop. The rectum is attached to the body wall along its whole length ending in a lobed anus. There are numerous oval polycarps embedded in the body wall, the male and female papillae are joined and protruding. Endocarps fill the whole peribranchial cavity and are present on the digestive loop.
The geographic distribution of this large species is wide around the Indo-Pacific and the western tropical Atlantic.
description: Published as part of Monniot, Françoise, 2009, Some ascidians from Indonesian marine lakes (Raja Ampat Islands, West Papua), pp. 13-40 in Zootaxa 2106 on pages 31-33, DOI: 10.5281/zenodo.274849
Absorption Lengths in the Holographic Plasma
Creators: name: Amado, Irene
name: Hoyos, Carlos
name: Landsteiner, Karl
name: Montero, Sergio
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider the effect of a periodic perturbation with frequency $ω$ on the holographic N=4 plasma represented by the planar AdS black hole. The response of the system is given by exponentially decaying waves. The corresponding complex wave numbers can be found by solving wave equations in the AdS black hole background with infalling boundary conditions on the horizon in an analogous way as in the calculation of quasinormal modes. The complex momentum eigenvalues have an interpretation as poles of the retarded Green's functions, where the inverse of the imaginary part gives an absorption length $λ$. At zero frequency we obtain the screening length for a static field. These are directly related to the glueball masses in the dimensionally reduced theory. We also point out that the longest screening length corresponds to an operator with non-vanishing R-charge and thus does not have an interpretation as a QCD3 glueball.
description: 30 pages,9 figures v2: stability discussion in the appendix extended, references added
Trevor Evans - Bibliography from TREVOR EVANS : 26 April 1927 — 10 October 2010 Elected FRS 1988
Creators: name: Brown, L. M.
name: Mills, I. M.
Publisher: name: The Royal Society
Year: 2021
Subjects: Crystallography

description: Trevor Evans is responsible for revealing the main physical processes which take place in natural diamond both in the upper mantle of the earth, where it is stabilized by high pressure and temperature, and as it is ejected by volcanic action to the surface. By measuring the activation energies required for graphitization, he clarified the reason for its very long life as a metastable crystal, valuable both as a gemstone and as an industrial abrasive. He learned how to make diamond specimens for examination in the transmission electron microscope, which enabled his discovery of dislocation loops and platelet precipitates in nitrogen-containing (type 1) stones. In a series of exacting laboratory experiments under geologically relevant conditions he pioneered the study of the emergence of nitrogen from solution to precipitation during the ejection process. In synthetic diamonds, using high-energy electron irradiation, he was able to reproduce the sequence of all the various types of nitrogen aggregation found in natural diamond. His work plays a major role underpinning the characterization of gemstones, explaining many features of their colour. For many years he led diamond research in the UK, supported by De Beers. His work stimulated and has been confirmed by research in many other laboratories around the world
The stellar content of low redshift BL Lac host galaxies from multicolour imaging
Creators: name: Hyvonen, T.
name: Kotilainen, J. K.
name: Falomo, R.
name: Orndahl, E.
name: Pursimo, T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present B-band imaging of 18 low redshift (z<0.3) BL Lac objects for which their host galaxies were previously resolved in the R-band and the near-infrared H-band. For a subset of the objects, also U- and V-band imaging is presented. These data are used to investigate the blue-red-near-infrared colours and the colour gradients of the host galaxies of BL Lacs in comparison with other elliptical galaxies with and without nuclear activity. In all cases galaxies are well represented by an elliptical model, with average absolute magnitude M_B=-21.6+-0.7 and average scale length R_e=7.6+-3.2 kpc. The best-fit B-band Kormendy relation is in reasonable agreement with that obtained for normal ellipticals and radio galaxies. This structural and dynamical similarity indicates that all massive elliptical galaxies can experience nuclear activity without significant perturbation of their global structure. The distributions of the integrated blue/near-infrared colour (with average B-H=3.5+-0.5) and colour gradient (with average Delta(B-R)/Delta(log r)=-0.14+-0.75) of the BL Lac hosts are much wider than those for normal ellipticals, and most BL Lac objects have bluer hosts and/or steeper colour gradients than those in normal ellipticals. The blue colours are likely caused by a young stellar population component, and indicates a link between star formation caused by an interaction/merging event and the onset of the nuclear activity. This result is corroborated by stellar population modelling, indicating a presence of young/intermediate age populations in the majority of the sample, in agreement with low redshift quasar hosts. The lack of strong signs of interaction may require a significant time delay between the event with associated star formation episodes and the start of the nuclear activity.
description: 16 pages, 10 figures
Clustering with general photo-$z$ uncertainties: Application to Baryon Acoustic Oscillations
Creators: name: Chan, Kwan Chuen
name: Ferrero, Ismael
name: Avila, Santiago
name: Ross, Ashley J.
name: Crocce, Martin
name: Gaztanaga, Enrique
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Photometric data can be analyzed using the three-dimensional correlation function $ξ_{\rm p}$ to extract cosmological information via e.g., measurement of the Baryon Acoustic Oscillations (BAO). Previous studies modeled $ξ_{\rm p} $ assuming a Gaussian photo-$z$ approximation. In this work we improve the modeling by incorporating realistic photo-$z$ distribution. We show that the position of the BAO scale in $ξ_{\rm p}$ is determined by the photo-$z$ distribution and the Jacobian of the transformation. The latter diverges at the transverse scale of the separation $s_\perp $, and it explains why $ξ_{\rm p } $ traces the underlying correlation function at $s_\perp $, rather than $s$, when the photo-$z$ uncertainty $ σ_z / (1+ z) \gtrsim 0.02$. We also obtain the Gaussian covariance for $ξ_{\rm p}$. Due to photo-$z$ mixing, the covariance of $ξ_{\mathrm{p}}$ shows strong off-diagonal elements. The high correlation of the data causes some issues to the data fitting. Nonetheless, we find that either it can be solved by suppressing the largest eigenvalues of the covariance or it is not directly related to the BAO. We test our BAO fitting pipeline using a set of mock catalogs. The data set is dedicated for Dark Energy Survey Year 3 (DES Y3) BAO analyses and includes realistic photo-$z$ distributions. The theory template is in good agreement with mock measurement. Based on the DES Y3 mocks, $ξ_{\rm p}$ statistic is forecast to constrain the BAO shift parameter $α$ to be $1.001 \pm 0.023$, which is well consistent with the corresponding constraint derived from the angular correlation function measurements. Thus $ξ_{\rm p}$ offers a competitive alternative for the photometric data analyses.
description: 20 pages, 17 figures, match to the published version
The distribution of diatoms in the surface sediments of British Columbia inlets
Creators: name: Roelofs, Adrienne Kehde
Publisher: name: University of British Columbia
Year: 2010

description: The purpose of the study was to examine the distributional patterns of diatoms in the surface sediments of ten southern British Columbia inlets with respect to oceanographic and hydrographic setting, and phytoplankton distribution and productivity. The study area was divided on the basis of inlet type (high, medium, and low runoff), within-inlet gradients, and zones (northern, central, and southern). A small group of species dominated the 95 sediment assemblages. There was a fairly good correlation between the biocoenoses and the thanatocoenoses in the sense that most of those species reported as dominants in the phytoplankton were also dominants in the sediment assemblages. However, there were discrepancies and these could not be explained on the basis of the relative silicification of the diatom valves. Skeletonema costatum, usually considered a weakly-silicified, dissolution-sensitive species, was abundant in British Columbia sediments. Both the pacifica and the aestivalis forms of Thalassiosira aestivalis were abundant in the phytoplankton, but only the pacifica form was preserved well in the sediments. Thalassiosira nordenskioeldii, which is found in other sediment assemblages, was rare in most British Columbia sediments. The distributional patterns of freshwater and marine littoral species appeared to be indicative of river sources entering the estuarine system. The absolute abundance of diatoms in the sediment assemblages increased from the northern to the southern zone. Within the inlets, both absolute abundance and primary productivity increased toward the mouth. Estuarine circulation did not appear to alter substantially the spatial relationship between the biocoenoses and the thanatocoenoses. In general, individual species and species-groups often exhibited distinct distributional patterns which could be related to inlet type, zonal, and within-inlet patterns. In particular, the principal coordinate analysis showed a zonal correlation between the dominant species in the sediment assemblages, and primary productivity, salinity, and temperature in the surface waters.
Cross-Camera Feature Prediction for Intra-Camera Supervised Person Re-identification across Distant Scenes
Creators: name: Ge, Wenhang
name: Pan, Chunyan
name: Wu, Ancong
name: Zheng, Hongwei
name: Zheng, Wei-Shi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Person re-identification (Re-ID) aims to match person images across non-overlapping camera views. The majority of Re-ID methods focus on small-scale surveillance systems in which each pedestrian is captured in different camera views of adjacent scenes. However, in large-scale surveillance systems that cover larger areas, it is required to track a pedestrian of interest across distant scenes (e.g., a criminal suspect escapes from one city to another). Since most pedestrians appear in limited local areas, it is difficult to collect training data with cross-camera pairs of the same person. In this work, we study intra-camera supervised person re-identification across distant scenes (ICS-DS Re-ID), which uses cross-camera unpaired data with intra-camera identity labels for training. It is challenging as cross-camera paired data plays a crucial role for learning camera-invariant features in most existing Re-ID methods. To learn camera-invariant representation from cross-camera unpaired training data, we propose a cross-camera feature prediction method to mine cross-camera self supervision information from camera-specific feature distribution by transforming fake cross-camera positive feature pairs and minimize the distances of the fake pairs. Furthermore, we automatically localize and extract local-level feature by a transformer. Joint learning of global-level and local-level features forms a global-local cross-camera feature prediction scheme for mining fine-grained cross-camera self supervision information. Finally, cross-camera self supervision and intra-camera supervision are aggregated in a framework. The experiments are conducted in the ICS-DS setting on Market-SCT, Duke-SCT and MSMT17-SCT datasets. The evaluation results demonstrate the superiority of our method, which gains significant improvements of 15.4 Rank-1 and 22.3 mAP on Market-SCT as compared to the second best method.
description: 10 pages, 6 figures, accepted by ACM International Conference on Multimedia
Constant mean curvature spacelike hypersurfaces in spatially open GRW spacetimes
Creators: name: Pelegrín, José A. S.
name: Rigoli, Marco
Publisher: name: arXiv
Year: 2021
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C80, 53C42, 53C50

description: In this paper we provide under certain geometric and physical assumptions new uniqueness and non-existence results for complete spacelike hypersurfaces of constant mean curvature in spatially open Generalized Robertson-Walker spacetimes. Some of our results are then applied to relevant spacetimes as the steady state spacetime, Einstein-de Sitter spacetime and certain radiation models.
description: This is a preprint of the article available at https://link.springer.com/article/10.1007/s12220-018-00117-8
Nonlinear transmission through a tapered fiber in rubidium vapor
Creators: name: Hendrickson, S. M.
name: Pittman, T. B.
name: Franson, J. D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Sub-wavelength diameter tapered optical fibers surrounded by rubidium vapor can undergo a substantial decrease in transmission at high atomic densities due to the accumulation of rubidium atoms on the surface of the fiber. Here we demonstrate the ability to control these changes in transmission using light guided within the taper. We observe transmission through a tapered fiber that is a nonlinear function of the incident power. This effect can also allow a strong control beam to change the transmission of a weak probe beam.
description: 10 pages, 4 figures
Locality and entanglement of indistinguishable particles
Creators: name: Johann, Till Jonas Frederick
name: Marzolino, Ugo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Entanglement is one of the strongest quantum correlation, and is a key ingredient in fundamental aspects of quantum mechanics and a resource for quantum technologies. While entanglement theory is well settled for distinguishable particles, there are five inequivalent approaches to entanglement of indistinguishable particles. We analyse the different definitions of indistinguishable particle entanglement in the light of the locality notion. This notion is specified by two steps: i) the identification of subsystems by means of their local operators; ii) the requirement that entanglement represent correlations between the above subsets of operators. We prove that three of the aforementioned five entanglement definitions are incompatible with any locality notion defined as above.
Manipulating Ferrimagnets by Fields and Currents
Creators: name: Guo, Mingda
name: Zhang, Hantao
name: Cheng, Ran
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Ferrimagnets (FIMs) can function as high-frequency antiferromagnets while being easy to detect as ferromagnets, offering unique opportunities for ultrafast device applications. While the physical behavior of FIMs near the compensation point has been widely studied, there lacks a generic understanding of FIMs where the ratio of sublattice spins can vary freely between the ferromagnetic and antiferromagnetic limits. Here we investigate the physical properties of a model two-sublattice FIM manipulated by static magnetic fields and current-induced torques. By continuously varying the ratio of sublattice spins, we clarify how the dynamical chiral modes in an FIM are intrinsically connected to their ferro- and antiferromagnetic counterparts, which reveals unique features not visible near the compensation point. In particular, we find that current-induced torques can trigger spontaneous oscillation of the terahertz exchange mode. Compared with its realization in antiferromagnets, a spin-torque oscillator using FIMs not only has a reduced threshold current density but also can be self-stabilized, obviating the need for dynamic feedback.
description: 9 pages and 7 figures
Feedback of superconductivity on the magnetic excitation spectrum of UTe$_{2}$
Creators: name: Raymond, S.
name: Knafo, W.
name: Knebel, G.
name: Kaneko, K.
name: Brison, J. -P.
name: Flouquet, J.
name: Aoki, D.
name: Lapertot, G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We investigate the spin dynamics in the superconducting phase of UTe$_{2}$ by triple-axis inelastic neutron scattering on a single crystal sample. At the wave-vector $\bf{k_1}$=(0, 0.57, 0), where the normal state antiferromagnetic correlations are peaked, a modification of the excitation spectrum is evidenced, on crossing the superconducting transition, with a reduction of the relaxation rate together with the development of an inelastic peak at $Ω$ $\approx$ 1 meV. The low dimensional nature and the the $a$-axis polarization of the fluctuations, that characterise the normal state, are essentially maintained below $T_{sc}$. The high ratio $Ω/k_{B}T_{sc}$ $\approx$ 7.2 contrasts with the most common behaviour in heavy fermion superconductors.
description: 3 figures, 1 table
Evaluierung der elektrischen und magnetischen Nahfeldmessung zur Identifikation nicht authentischer elektrischer Halbleiterkomponenten
Creators: name: Juwien, Adrian
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2024
Subjects: subject: Nahfeldmessung
subject: Magnetisch
subject: Elektrisch
subject: Halbleiter
subject: DDC::6** Technik, Medizin, angewandte Wissenschaften::62* Ingenieurwissenschaften

description: Im Rahmen der vorliegenden Bachelorarbeit wurde ein zerstörungsfreies Messystem zur Identifizierung von nicht authentischen Halbleiterkomponenten entwickelt und implementiert. Die Messvorrichtung und die konzipierte Methodik verwenden elektrische und magnetische Nahfeldsonden, um die elektromagnetischen Nahfelder von elektronischen Baustellen zu untersuchen. Mit der Evaluierung der elektrischen und magnetischen Nahfelder können Unterschiede zwischen einer originalen Referenzprobe und einer potenziellen Fälschung mittels spektraler Signalverarbeitung aufgedeckt werden. Diese Bachelorarbeit nimmt dabei Bezug auf die Herstellung der elektrischen und magnetischen Nahfeldsonden, die Implementierung des Sondenpositionierungssystems Pegasus sowie des Datenerfassungssystems, welches eine Analog-Digital-Konverter-Messkarte umfasst. Die Bedienung des Messystems erfolgt über die entwickelte Softwareschnittstelle, die Pegasus Scanner App genannt wird. Zur Identifizierung der elektronischen Fälschungen werden die Nahfeldsonden in einem rasterförmigen Muster mit einem minimalen Abstand über die Oberfläche der Proben bewegt, um ein Messergebnis der kapazitiv eingekoppelten oder induzierten Spannungen der elektrischen oder magnetischen Feldquellen zu erhalten. Die Analyse der Oberflächenmessergebnisse ermöglicht die Identifizierung von elektronischen Fälschungen, jedoch können recycelte Originalbauteile mit manipulierten Bezeichnungen oder identische klone von originalen Bauteilen durch die Feldverteilung nicht detektiert werden. Eine elektronische Fälschung ist anhand der unterschiedlichen Spannungspegel durch Abweichungen in der Feldquellenlokalität sowie durch divergente Frequenzsprektren zu unterscheiden.
Superconducting dome in ferroelectric-type materials from soft mode instability
Creators: name: Setty, Chandan
name: Baggioli, Matteo
name: Zaccone, Alessio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We present a minimal theory of superconductivity enhancement in ferroelectric-type materials. Simple expressions for the optical mode responsible for the soft mode transition are assumed. A key role is played by the anharmonic phonon damping which is modulated by an external control parameter (electron doping or mechanical strain) causing the appearance of the soft mode. It is shown that the enhancement in the superconducting critical temperature $T_{c}$ upon approaching the ferroelectric transition from either side is due to the Stokes electron-phonon scattering processes promoted by strong phonon damping effects.
description: Synopsis in APS Physics at: https://physics.aps.org/articles/v15/s11
Supplementary Materials.pdf from Strategizing COVID-19 lockdowns using mobility patterns
Creators: name: Buchel, Olha
name: Ninkov, Anton
name: Cathel, Danise
name: Bar-Yam, Yaneer
name: Hedayatifar, Leila
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: 60114 Systems Biology
subject: FOS: Biological sciences
subject: 60199 Biochemistry and Cell Biology not elsewhere classified
subject: 69999 Biological Sciences not elsewhere classified
subject: 80109 Pattern Recognition and Data Mining
subject: FOS: Computer and information sciences

description: During the COVID-19 pandemic, governments have attempted to control infections within their territories by implementing border controls and lockdowns. While large-scale quarantine has been the most successful short-term policy, the enormous costs exerted by lockdowns over long periods are unsustainable. As such, developing more flexible policies that limit transmission without requiring large-scale quarantine is an urgent priority. Here, the dynamics of dismantled community mobility structures within US society during the COVID-19 outbreak are analysed by applying the Louvain method with modularity optimization to weekly datasets of mobile device locations. Our networks are built based on individuals' movements from February to May 2020. In a multi-scale community detection process using the locations of confirmed cases, natural break points from mobility patterns as well as high risk areas for contagion are identified at three scales. Deviations from administrative boundaries were observed in detected communities, indicating that policies informed by assumptions of disease containment within administrative boundaries do not account for high risk patterns of movement across and through these boundaries. We have designed a multi-level quarantine process that takes these deviations into account based on the heterogeneity in mobility patterns. For communities with high numbers of confirmed cases, contact tracing and associated quarantine policies informed by underlying dismantled community mobility structures is of increasing importance.
Cosmological forecasts on thermal axions, relic neutrinos and light elements
Creators: name: Giarè, William
name: Renzi, Fabrizio
name: Melchiorri, Alessandro
name: Mena, Olga
name: Di Valentino, Eleonora
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: One of the targets of future Cosmic Microwave Background and Baryon Acoustic Oscillation measurements is to improve the current accuracy in the neutrino sector and reach a much better sensitivity on extra dark radiation in the Early Universe. In this paper we study how these improvements can be translated into constraining power for well motivated extensions of the Standard Model of elementary particles that involve axions thermalized before the quantum chromodynamics (QCD) phase transition by scatterings with gluons. Assuming a fiducial $Λ$CDM cosmological model, we simulate future data for Stage-IV CMB-like and Dark Energy Spectroscopic Instrument (DESI)-like surveys and analyze a mixed scenario of axion and neutrino hot dark matter. We further account also for the effects of these QCD axions on the light element abundances predicted by Big Bang Nucleosynthesis. The most constraining forecasted limits on the hot relic masses are $m_{\rm a} \lesssim 0.92$ eV and $\sum m_ν\lesssim 0.12$ eV at 95 per cent Confidence Level, showing that future cosmic observations can substantially improve the current bounds, supporting multi-messenger analyses of axion, neutrino and primordial light element properties.
description: 10 pages, 5 figures. Version Published in MNRAS
Pyura curvigona Tokioka 1950
Creators: name: Monniot, Françoise
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Ascidiacea
Pleurogona
Pyuridae
Pyura
Pyura curvigona

description: Pyura curvigona? Tokioka, 1950
(Figures 15 B, 16, 17)
 Pyura curvigona Tokioka, 1950: 147, fig. 23, pl.10 figs 4–6; 1967: 199, figs 88–89; Tokioka & Nishikawa, 1975: 339, figs 37–40; Millar, 1975:312; Kott, 1985:296, figs 143a–b, 144. Cole & Vorontsova, 1998: 4, fig. 3.
 Material. Indonesia. West Papua, Gam Island,, NW. Gam Island, Danau Ctenophore marine lake, 00°27.289’S – 130°29.580’E, 1m, 26/X/2007, coll. L.J. Bell and L.E. Martin, DCG 0 35 (MNHN S2 PYU 433).
 Information supplied by the collector indicate that specimens settled in exposed locations are red, those under overhangs are pale. Both specimens studied here are brown, 55mm and 35mm in size. The apertures are iridescent (Fig. 15 B), densely covered with long spinules which have an enlarged round base (Figs 16 A,B).These spinules constitute one of the main characteristics of the species with the wide rectum. The internal organs (Fig. 17 A,B) are those reported in previous descriptions: poorly ramified oral tentacles, 6 branchial folds (Fig. 17 B), a long digestive loop with an enlarged rectum and endocarps in a row along its whole external side. The liver has small digitate lobes at the cardiac side of the stomach and a cauliflower massive lobe at the pyloric end. The gonads are curved (Fig. 17 A) and each lobe wears several endocarps. The heart is long and wide. In the smallest specimen only 4 small endocarps are spaced along the ventral side of the heart, and look like dermato-branchial bridges, but in the largest specimen the endocarps are well developed and form a continuous line along the heart (Fig. 17 A). No other endocarps were detected elsewhere on the body wall. The latter structure is similar to that described and figured for Pyura gangelion (Savigny, 1816) by Monniot C. (2001) and its junior synonym Pyura albanyensis Michaelsen, 1927 described by Monniot C. (1989), but they have different spinules.
 The spinule shape and the enlarged rectum in a Pyura with 6 branchial folds indicate these specimens as P. curvigona, but the presence of endocarps on the heart is disturbing as they have not been reported before. As they are few and hardly visible in one specimen, it is possible that they have been previously overlooked or their presence variable.
description: Published as part of Monniot, Françoise, 2009, Some ascidians from Indonesian marine lakes (Raja Ampat Islands, West Papua), pp. 13-40 in Zootaxa 2106 on pages 33-35, DOI: 10.5281/zenodo.274849
From Feynman Proof of Maxwell Equations to Noncommutative Quantum Mechanics
Creators: name: Bérard, A.
name: Mohrbach, H.
name: Lages, J.
name: Gosselin, P.
name: Grandati, Y.
name: Boumrar, H.
name: Menas, F.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In 1990, Dyson published a proof due to Feynman of the Maxwell equations assuming only the commutation relations between position and velocity. With this minimal assumption, Feynman never supposed the existence of Hamiltonian or Lagrangian formalism. In the present communication, we review the study of a relativistic particle using ``Feynman brackets.'' We show that Poincaré's magnetic angular momentum and Dirac magnetic monopole are the consequences of the structure of the Lorentz Lie algebra defined by the Feynman's brackets. Then, we extend these ideas to the dual momentum space by considering noncommutative quantum mechanics. In this context, we show that the noncommutativity of the coordinates is responsible for a new effect called the spin Hall effect. We also show its relation with the Berry phase notion. As a practical application, we found an unusual spin-orbit contribution of a nonrelativistic particle that could be experimentally tested. Another practical application is the Berry phase effect on the propagation of light in inhomogeneous media.
description: Presented at the 3rd Feynman Festival (Collage Park, Maryland, U.S.A., August 2006)
The scattering matrix and associated formulas in Hamiltonian mechanics
Creators: name: Buslaev, Vladimir
name: Pushnitski, Alexander
Publisher: name: arXiv
Year: 2008
Subjects: subject: Spectral Theory (math.SP)
subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics
subject: 81U20; 37J99; 70H15

description: We survey the basic notions of scattering theory in Hamiltonian mechanics with a particular attention to the analogies with scattering theory in quantum mechanics. We discuss the scattering symplectomorphism, which is analogous to the scattering matrix. We prove identities which relate the Calabi invariant of the scattering symplectomorphism to the total time delay and the regularised phase space volume. These identities are analogous to the Birman-Krein formula and the Eisenbud-Wigner formula in quantum scattering theory.
Volume-energy correlations in the slow degrees of freedom of computer-simulated phospholipid membranes
Creators: name: Pedersen, Ulf R.
name: Peters, Günther H.
name: Schrøder, Thomas B.
name: Dyre, Jeppe C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: Constant-pressure molecular-dynamics simulations of phospholipid membranes in the fluid phase reveal strong correlations between equilibrium fluctuations of volume and energy on the nanosecond time-scale. The existence of strong volume-energy correlations was previously deduced indirectly by Heimburg from experiments focusing on the phase transition between the fluid and the ordered gel phases. The correlations, which are reported here for three different membranes (DMPC, DMPS-Na, and DMPSH), have volume-energy correlation coefficients ranging from 0.81 to 0.89. The DMPC membrane was studied at two temperatures showing that the correlation coefficient increases as the phase transition is approached.
Entwicklung einer benutzerfreundlichen Software zur Berechnung von Rundfunk-Sendeantennen
Creators: name: Fuhrmann, Christine
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2015
Subjects: subject: Software
subject: Rundfunk
subject: Sendeantennen
subject: DDC::6** Technik, Medizin, angewandte Wissenschaften::60* Technik

description: Die Abteilung Sendertechnik des Norddeutschen Rundfunks betreibt die Sender zur Versorgung der Rundfunknutzer und befasst sich unter anderem mit der Planung und Optimierung von Sendeantennen. Das Ziel dieser Bachelorarbeit war die Entwicklung einer Software, mit der Horizontaldiagramme von Antennen erstellt, angepasst und dokumentiert werden können. Dafür wurde eine vorhandene LabVIEW-Software in ihren Grundzügen übernommen, in eine neue, in Java entwickelte, Programmumgebung übertragen und dort erweitert und optimiert. Die Arbeit dokumentiert die Grundlagen der Sendeantennenplanung und die programmiertechnischen Entwicklungsschritte bis hin zur fertiggestellten und funktionsfähigen Software. Im Speziellen geht sie dabei auf die Berechnung von Antennensystemen, die Erstellung von Horizontaldiagrammen sowie die objektorientierte Programmierung und die Erstellung von grafischen Benutzeroberflächen ein. Dabei werden die einzelnen Entwicklungsschritte dokumentiert und erläutert sowie die Validierung der Software beschrieben.