cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Performance of Dual-Hop Relaying for OWC System Over Foggy Channel with Pointing Errors and Atmospheric Turbulence
Creators: name: Rahman, Ziyaur
name: Shah, Tejas Nimish
name: Zafaruddin, S. M.
name: Chaubey, V. K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Theory (cs.IT)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Optical wireless communication (OWC) over atmospheric turbulence and pointing errors is a well-studied topic. Still, there is limited research on signal fading due to random fog in an outdoor environment for terrestrial wireless communications. In this paper, we analyze the performance of a decode-and-forward (DF) relaying under the combined effect of random fog, pointing errors, and atmospheric turbulence with a negligible line-of-sight (LOS) direct link. We consider a generalized model for the end-to-end channel with independent and not identically distributed (i.ni.d.) pointing errors, random fog with Gamma distributed attenuation coefficient, double generalized gamma (DGG) atmospheric turbulence, and asymmetrical distance between the source and destination. We develop density and distribution functions of signal-to-noise ratio (SNR) under the combined effect of random fog, pointing errors, and atmospheric turbulence (FPT) channel and distribution function for the combined channel with random fog and pointing errors (FP). Using the derived statistical results, we present analytical expressions of the outage probability, average SNR, ergodic rate, and average bit error rate (BER) for both FP and FPT channels in terms of OWC system parameters. We also develop simplified and asymptotic performance analysis to provide insight on the system behavior analytically under various practically relevant scenarios. We demonstrate the mutual effects of channel impairments and pointing errors on the OWC performance, and show that the relaying system provides significant performance improvement compared with the direct transmissions, especially when pointing errors and fog becomes more pronounced.
description: 16 pages, 5 figures, 3 Tables. Accepted for publication in the IEEE Transactions on Vehicular Technology
Azimuthal decorrelation of Mueller-Navelet jets at the Tevatron and the LHC
Creators: name: Marquet, C.
name: Royon, C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the production of Mueller-Navelet jets at hadron colliders in the Balitsky-Fadin-Kuraev-Lipatov (BFKL) framework. We show that a measurement of the relative azimuthal angle ΔΦbetween the jets can provide a good testing ground for corrections due to next-leading logarithms (NLL). Besides the well-known azimuthal decorrelation with increasing rapidity interval Δηbetween the jets, we propose to also measure this effect as a function of R=k_2/k_1, the ratio between the jets transverse momenta. Using renormalisation-group improved NLL kernel, we obtain predictions for dσ/dΔηdR dΔΦ. We analyse NLL-scheme and renormalisation-scale uncertainties, and energy-momentum conservation effects, in order to motivate a measurement at the Tevatron and the LHC.
description: 11 pages, 7 figures, energy conservation effects added
Characterization of a T lymphocyte-derived, antigen-binding molecule with suppressive activity
Creators: name: Chu, Nelson Randall
Publisher: name: University of British Columbia
Year: 2011

description: Regulation of the immune response is mediated, in part, by the action of suppressor T cells (Ts). One intriguing aspect of these cells is the description of T cell suppressor factor (TsF): a soluble analog of the cell that shares many of its properties, such as the ability to bind free antigen (Ag) and suppress an Ag-specific immune response. The exact molecular nature of TsF and the relationship of TsF to Ts are unknown. The immune response to the small, bacterial protein, ferredoxin (Fd), was used as a model system to study TsF. A Fd-specific suppressor cell network has been described in mice that are genetically nonresponsive to this Ag. Previously, a soluble mediator, known as Fd11F, was found in the culture supernatant (SN) of the Ts hybridoma, Fd11. Fd11F possessed both Ag-binding activity and the ability to suppress the anti-Fd Ab response in mice. The TsF-specific monoclonal antibody, B16G, was used for both the recovery of Fd11F-enriched material from SN and its detection by the enzyme-linked immunosorbent assay. ' Further immunochemical, biological, and biochemical characterization of Fd11F was done with emphasis on describing the Ag-binding properties of Fd11F. It was found that Fd11F bound to solid- and liquid-phase Fd, and demonstrated preferential binding to the carrier determinant of the Ag. A spleen cell culture assay was devised which showed that Fd11F suppressed Ab production in a concentration-dependent manner. Additional experiments suggested that the suppressive effect was Ag-specific. The identification of the Ag-binding molecule was attempted by the fractionation of Fd11F-enriched material using high performance gel filtration or preparative SDS-PAGE (run under non-reducing conditions). Using SDS-PAGE, a unique, single polypeptide of about 30k relative molecular mass (Mr) was identified as the Ag-binding moiety of Fd11F. The possible relationship of this moiety to other identified materials is discussed.
The East Asian Voicing Shift, Desegmental Phonology, and Tonal Reconstruction in Southeast Asia
Creators: name: , Dockum
Publisher: name: Zenodo
Year: 2021

description: Note: This talk has not gone through a process of peer review, and findings should therefore be treated as preliminary and subject to change. SOAS Linguistics webinars
 The East Asian Voicing Shift, Desegmental Phonology, and Tonal Reconstruction in Southeast Asia Rikker Dockum (Swarthmore College) Abstract: Lexically contrastive patterns of pitch and voice quality, commonly called 'tone' and 'register' respectively, are found around the world, including in all five of the major language families of Southeast Asia (Austroasiatic, Austronesian, Hmong-Mien, Kra-Dai, and Sino-Tibetan). Underlying the origins of both tone and register is the East Asian Voicing Shift (EAVS), a wave of massively cross-linguistic sound changes, in which onset voicing contrasts became neutralized across an enormous swath of East and Southeast Asia. The EAVS conditioned new phonemic tones in those languages which were already tonal, and conditioned the emergence of register in atonal languages. In this talk I discuss these as examples of ‘desegmental’ sound change, whereby phonemic contrasts previously borne by segments are transphonologized as suprasegments, and I discuss how this approach expands our ability to reconstruct past stages of lexical tone in Tai languages of the Kra-Dai language family, and beyond. YouTube: https://youtu.be/oY2MSKb7g_w
On the orbital and physical parameters of the HDE 226868/Cygnus X-1 binary system
Creators: name: Iorio, Lorenzo
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this paper we explore the consequences of the recent determination of the mass m=(8.7 +/- 0.8)M_Sun of Cygnus X-1, obtained from the Quasi-Periodic Oscillation (QPO)-photon index correlation scaling, on the orbital and physical properties of the binary system HDE 226868/Cygnus X-1. By using such a result and the latest spectroscopic optical data of the HDE 226868 supergiant star we get M=(24 +/- 5)M_Sun for its mass. It turns out that deviations from the third Kepler law significant at more than 1-sigma level would occur if the inclination i of the system's orbital plane to the plane of the sky falls outside the range 41-56 deg: such deviations cannot be due to the first post-Newtonian (1PN) correction to the orbital period because of its smallness; interpreted in the framework of the Newtonian theory of gravitation as due to the stellar quadrupole mass moment Q, they are unphysical because Q would take unreasonably large values. By conservatively assuming that the third Kepler law is an adequate model for the orbital period we obtain i=(48 +/- 7) deg which yields for the relative semimajor axis a=(42 +/- 9)R_Sun. Our estimate for the Roche's lobe of HDE 226868 is r_M = (21 +/- 6)R_Sun.
description: Latex2e, 7 pages, 1 table, 4 figures. To appear in ApSS (Astrophysics and Space Science)
r-Process Radioisotopes from Near-Earth Supernovae and Kilonovae
Creators: name: Wang, Xilu
name: Clark, Adam M.
name: Ellis, John
name: Ertel, Adrienne F.
name: Fields, Brian D.
name: Liu, Zhenghai
name: Miller, Jesse A.
name: Surman, Rebecca
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: The astrophysical sites where r-process elements are synthesized remain mysterious: it is clear that neutron star mergers (kilonovae (KNe)) contribute, and some classes of core-collapse supernovae (SNe) are also likely sources of at least the lighter r-process species. The discovery of 60Fe on the Earth and Moon implies that one or more astrophysical explosions have occurred near the Earth within the last few million years, probably SNe. Intriguingly, 244Pu has now been detected, mostly overlapping with 60Fe pulse. However, the 244Pu flux may extend to before 12 Myr ago, pointing to a different origin. Motivated by these observations and difficulties for r-process nucleosynthesis in SN models, we propose that ejecta from a KN enriched the giant molecular cloud that gave rise to the Local Bubble, where the Sun resides. Accelerator mass spectrometry (AMS) measurements of 244Pu and searches for other live isotopes could probe the origins of the r-process and the history of the solar neighborhood, including triggers for mass extinctions, e.g., that at the end of the Devonian epoch, motivating the calculations of the abundances of live r-process radioisotopes produced in SNe and KNe that we present here. Given the presence of 244Pu, other r-process species such as 93Zr, 107Pd, 129I, 135Cs, 182Hf, 236U, 237Np and 247Cm should be present. Their abundances and well-resolved time histories could distinguish between the SN and KN scenarios, and we discuss prospects for their detection in deep-ocean deposits and the lunar regolith. We show that AMS 129I measurements in Fe-Mn crusts already constrain a possible nearby KN scenario.
description: 45 pages, 14 figures, 11 tables, v2 matches version to appear in ApJ
Percepciones ciudadanas hacia la democracia y las instituciones políticas en los Países Andinos
Creators: name: Freidenberg, Flavia
Publisher: name: figshare
Year: 2021
Subjects: subject: 160699 Political Science not elsewhere classified
subject: FOS: Political science

description: Citar como: Flavia Freidenberg. 2000. "Percepciones Ciudadanas hacia la democracia y las instituciones políticas en los Países Andinos". Ecuador Debate 50 (agosto): 205-218 (Quito: Centro Andino de Acción Popular. ISSN: 1012-1498).https://doi.org/10.6084/m9.figshare.14050637.v1
Cohomology of Split Group Extensions and Characteristic Classes
Creators: name: Petrosyan, Nansen
Publisher: name: arXiv
Year: 2007
Subjects: subject: Algebraic Topology (math.AT)
subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20J06

description: There are characteristic classes that are the obstructions to the vanishing of the differentials in the Lyndon-Hochischild-Serre spectral sequence of an extension of an integral lattice L by a group G. These characteristic classes exist in a given page of the spectral sequence provided the differentials in the previous pages are all zero. When L decomposes into a sum of G-sublattices, we show that there are defining relations between the characteristic classes of L and the characteristic classes of its summands.
description: 13 pages
Intelligent Train Automatic Stop Control (iTASC)
Creators: name: Siahvashi, Ali
Publisher: name: Macquarie University
Year: 2024
Subjects: classificationCode: 399999
subject: Other education not elsewhere classified

description: In a conventional train signalling system, stopping a train at stations is the responsibility of train drivers. Before each station, a signal known as Home Signal in railway terminology, warns the driver that the train is approaching a station. However, due to different brake system characteristics and capabilities, different track profiles as well as different competency levels of drivers, it is a challenging task to stop a train precisely by just one braking action while maintaining a uniform quality of ride.In addition to this, the use of platform screen doors (PSD) in railway stations can introduce various challenges for planners, track engineers, rolling stock manufacturers, brake engineers and PSD suppliers. Monitoring stopping spots, the braking rate, and real data are the initial requirements for any further development and evaluation for a sound and stable train control system.In the last three decades, train automatic stop control (TASC) algorithms have been developed and applied to different metro and heavy haul rail corridors all over the globe. However, even the most developed controllers have relied entirely on station markers such as home signals, on-the-track sensors or Balises. Although, position uncertainty has been considered in several studies before, it has been largely ignored in TASC studies so the foremost shortcoming of previously developed TASC algorithms is that they had not considered position uncertainty. The second most important problem with these algorithms for TASC is the exclusion of the inherent time delay in braking systems in response to any control signal.Therefore, to consider those factors, a braking model for station stopping is developed in this thesis, which accounts for the time dependency of the train’s air brake system to improve the accuracy of the train’s stopping.Finally, train position uncertainty, which is a missing concern in previous works, has been added to this thesis’s study.
CHARACTERIZING THIOESTERASES FOR BIOCATALYTIC PEPTIDE MACROCYCLIZATION
Creators: name: Budimir, Zachary Logan
Publisher: name: Purdue University Graduate School
Year: 2025
Subjects: classificationCode: 310106
subject: Enzymes
classificationCode: 310112
subject: Structural biology (incl. macromolecular modelling)
classificationCode: 340503
subject: Organic chemical synthesis
classificationCode: 340599
subject: Organic chemistry not elsewhere classified

description: Peptide-based therapeutics have emerged as a crucial class of pharmaceutical molecules, balancing the advantages of small molecules and biologics. Their high potency, selectivity, and minimal immunogenicity make them valuable therapeutic agents. However, linear peptides often suffer from poor stability, low bioavailability, and susceptibility to proteolytic degradation, limiting their clinical utility. Macrocyclization has emerged as a powerful strategy to enhance peptide stability, potency, and membrane permeability by imposing conformational rigidity and eliminating terminal charges. While chemical approaches exist, they frequently require specific amino acid sequences, restricting the diversity of accessible macrocyclic scaffolds.This work explores biocatalytic strategies for peptide macrocyclization through thioesterase enzymes. Specifically, the characterization of Ulm16 and WP516, penicillin-binding protein-type thioesterases (PBP-TEs) capable of efficiently catalyzing head-to-tail macrolactamization of nonribosomal peptides, including synthetically challenging tetrapeptides. Structural and mutagenesis studies reveal the molecular basis of PBP-TE-catalyzed cyclization, laying the groundwork for future enzyme engineering efforts. This work is further extended to the biocatalytic synthesis of macrocyclic indolylamide peptides, demonstrating that the thioesterase domain from Bulbiferamide biosynthesis (Bulb-TE) can install this challenging linkage under mild conditions.Collectively, this thesis highlights the power of enzyme-based peptide macrocyclization, expanding the biocatalytic toolkit for generating structurally diverse and pharmaceutically relevant macrocyclic peptides. By characterizing novel thioesterases and developing strategies for their discovery, this work provides a foundation for future advancements in enzyme engineering and biocatalytic peptide synthesis.
Radio Observations of AGN in Low Surface Brightness Galaxies
Creators: name: Das, M.
name: McGaugh, S. S.
name: Kantharia, N.
name: Vogel, S. N.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present preliminary results of a study of the low frequency radio continuum emission from the nuclei of Giant Low Surface Brightness (LSB) galaxies. We have mapped the emission and searched for extended features such as radio lobes/jets associated with AGN activity. LSB galaxies are poor in star formation and generally less evolved compared to nearby bright spirals. This paper presents low frequency observations of 3 galaxies; PGC 045080 at 1.4 GHz, 610 MHz, 325MHz, UGC 1922 at 610 MHz and UGC 6614 at 610 MHz. The observations were done with the GMRT. Radio cores as well as extended structures were detected and mapped in all three galaxies; the extended emission may be assocated with jets/lobes associated with AGN activity. Our results indicate that although these galaxies are optically dim, their nuclei can host AGN that are bright in the radio domain.
description: To appear in proceedings IAU Symp 244, 'Dark Galaxies and Lost Baryons', June 2007, 2 pages including 1 figure
Stroke Process Mining Analysis Virtual Machine Image (VHD format)
Creators: name: González-García, Juan
name: Estupiñán-Romero, Francisco
name: Tellería-Orriols, Carlos
name: Bernal-Delgado, Enrique
Publisher: name: Zenodo
Year: 2019
Subjects: process mining
federated analysis
stroke

description: Virtual Machine image in VHD format required for the execution of the stroke process mining analysis (originally developed as part of ICTUSnet project working package 3.3). Tested with VirtualBox 6.x.

For further information contact IACS Biocomputing Unit / Juan González García
description: SUDOE project. Grant Agreement: SOE2/P1/E0623
The effect of dipole-dipole interactions between atoms in an active medium
Creators: name: Berezovsky, V. V.
name: Men'shikov, L. I.
name: Oberg, S.
name: Latham, C. D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Based on the results of numerical modeling, it is shown that dipole-dipole interactions among atoms in the active medium influences strongly the character of the associated superradiation. The main effect is to make the nuclear subsystem behave chaotically. Its strength increases with the atom density, and leads to the suppression of distant collective correlations and superradiation. Near correlations between the atoms are established, causing a confinement effect: a shielding of radiation in the active medium.
description: 8 pages, 7 figures
Singular measures of circle homeomorphisms with two break points
Creators: name: Dzhalilov, Akhtam
name: Liousse, Isabelle
name: Mayer, Dieter
Publisher: name: arXiv
Year: 2007
Subjects: subject: Dynamical Systems (math.DS)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 37E10, 37C15, 37C40

description: Let $T_{f}$ be a circle homeomorphism with two break points $a_{b},c_{b}$ and irrational rotation number $\varrho_{f}$. Suppose that the derivative $Df$ of its lift $f$ is absolutely continuous on every connected interval of the set $S^{1}\backslash\{a_{b},c_{b}\}$, that $DlogDf \in L^{1}$ and the product of the jump ratios of $ Df $ at the break points is nontrivial, i.e. $\frac{Df_{-}(a_{b})}{Df_{+}(a_{b})}\frac{Df_{-}(c_{b})}{Df_{+}(c_{b})}\neq1$. We prove that the unique $T_{f}$- invariant probability measure $μ_{f}$ is then singular with respect to Lebesgue measure $l$ on $S^{1}$.
Constrained Supermanifolds for AdS M-Theory Backgrounds
Creators: name: Fré, Pietro
name: Grassi, Pietro Antonio
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A long standing problem is the supergauge completion of AdS_4 x (G/H)_7 or AdS_5 x (G/H)_5 backgrounds which preserve less then maximal supersymmetry. In parallel with the supersolvable realization of the AdS_4 x S^7 background based on Kappa-symmetry, we develop a technique which amounts to solving the above-mentioned problem in a way useful for pure spinor quantization for supermembranes and superstrings. Instead of gauge fixing some of the superspace coordinates to zero, we impose an additional constraint on them reproducing the simplifications of the supersolvable representations. The constraints are quadratic, homogeneous, Sp(4,R)-covariant, and consistent from the quantum point of view in the pure spinor approach. Here we provide the geometrical solution which, in a subsequent work, will be applied to the membrane and the superstring sigma models.
description: LaTex, 47 pages, no figures
Chandra Observation of PSR B1823-13 and its Pulsar Wind Nebula
Creators: name: Pavlov, G. G.
name: Kargaltsev, O.
name: Brisken, W. F.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report on an observation of the Vela-like pulsar B1823-13 and its synchrotron nebula with Chandra.The pulsar's spectrum fits a power-law model with a photon index Gamma_PSR=2.4 for the plausible hydrogen column density n_H=10^{22} cm^{-2}, corresponding to the luminosity L_PSR=8*10^{31} ergs s^{-1} in the 0.5-8 keV band, at a distance of 4 kpc. The pulsar radiation likely includes magnetospheric and thermal components, but they cannot be reliably separated because of the small number of counts detected and strong interstellar absorption. The pulsar is surrounded by a compact, 25''x 10'', pulsar wind nebula (PWN) elongated in the east-west direction, which includes a brighter inner component, 7''x 3'', elongated in the northeast-southwest direction. The slope of the compact PWN spectrum is Gamma_comp=1.3, and the 0.5-8 keV luminosity is L_comp~3*10^{32} ergs s^{-1}. The compact PWN is surrounded by asymmetric diffuse emission (extended PWN) seen up to at least 2.4' south of the pulsar, with a softer spectrum (Gamma_ext=1.9), and the 0.5-8 keV luminosity L_ext~10^{33}-10^{34} ergs s^{-1}. We also measured the pulsar's proper motion using archival VLA data: μ_α=23.0+/-2.5 mas yr^{-1}, μ_δ=-3.9+/-3.3 mas yr^{-1}, which corresponds to the transverse velocity v_perp=440 km s^{-1}. The direction of the proper motion is approximately parallel to the elongation of the compact PWN, but it is nearly perpendicular to that of the extended PWN and to the direction towards the center of the bright VHE gamma-ray source HESS J1825-137, which is likely powered by PSR B1823-13.
description: 13 pages, 8 figures and 3 tables; submitted to ApJ
Phantom field dynamics in loop quantum cosmology
Creators: name: Samart, Daris
name: Gumjudpai, Burin
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider a dynamical system of phantom scalar field under exponential potential in background of loop quantum cosmology. In our analysis, there is neither stable node nor repeller unstable node but only two saddle points, hence no Big Rip singularity. Physical solutions always possess potential energy greater than magnitude of the negative kinetic energy. We found that the universe bounces after accelerating even in the domination of the phantom field. After bouncing, the universe finally enters oscillatory regime.
description: 8 pages, 6 figures, Revtex 4, Figures and References added. Version accepted by Physical Review D15
Two-wire Junction of Inequivalent Tomonaga-Luttinger Liquids
Creators: name: Kang, Yao-Tai
name: Lo, Chung-Yu
name: Oshikawa, Masaki
name: Kao, Ying-Jer
name: Chen, Pochung
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We develop two novel numerical schemes to study the conductance of the two-wire junction of inequivalent Tomonaga-Luttinger Liquids. In the first scheme we use the static current-current correlation function across the junction to extract the linear conductance through a relation that is derived via the bosonization method. In the second scheme we apply a bias and evaluate the time-dependent current across the junction to obtain the current-voltage characteristic. The conductance is then extracted from the small bias result within the linear response regime. Both schemes are based on the infinite size matrix product state to minimize the finite-size effects. Due to the lack of the translational invariance, we focus on a finite-size window containing the junction. For time-independent calculations, we use infinite boundary conditions to evaluate the correlations within the window. For time-dependent calculations, we use the window technique to evaluate the local currents within the window. The numerical results obtained by both schemes show excellent agreement with the analytical predictions.
description: 11 pages, 10 figures
Análisis figurativo en dos poemas de Consejero del lobo (1965) de Rodolfo Hinostroza
Creators: name: Aguila, Jesús Miguel Delgado Del
Publisher: name: figshare
Year: 2021
Subjects: Literature

description: Delgado Del Aguila, Jesús Miguel (2019). «Análisis figurativo en dos poemas de Consejero del lobo (1965) de Rodolfo Hinostroza», en: Tonos Digital. Revista indexada en Scopus. Murcia, España: Universidad de Murcia. N.° 37, julio, pp. 1-30. Disponible en https://www.um.es/tonosdigital/znum37/secciones/tintero-3-_delgado_analisis_de_consejero_del_lobo.pdf
Quantum decoherence in the theory of open systems
Creators: name: Isar, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In the framework of the Lindblad theory for open quantum systems, we determine the degree of quantum decoherence of a harmonic oscillator interacting with a thermal bath. It is found that the system manifests a quantum decoherence which is more and more significant in time. We calculate also the decoherence time scale and analyze the transition from quantum to classical behaviour of the considered system.
description: 6 pages; talk at the 3rd International Workshop "Quantum Physics and Communication" (QPC 2005), Dubna, Russia, 2005
Studies on the normal and abnormal lung growth in the human and in the rat with emphasis on the connective tissue fibers of the lung
Creators: name: Cherukupalli, Kamala
Publisher: name: University of British Columbia
Year: 2011

description: Infants with bronchopulmonary dysplasia (BPD), showed impaired body growth when compared to control infants. In terms of changes in the biochemical composition of the lung, BPD infants had higher DNA, soluble protein, collagen and desmosine contents as well as increased concentrations of DNA, collagen and desmosine in their lungs when compared to the growth patterns obtained for the lungs of control infants. Pathologically BPD was classified into 4 grades. Grade I BPD, was a phase of acute lung injury, grades II and III were proliferative phases. In grade IV BPD, lung structure returned towards normal. Evidence of fibrosis was seen by a significant increase in collagen concentration in grades II and III while desmosine concentration was seen to increase in grades III and IV suggesting that the increase in collagen and desmosine contents in the lungs of BPD infants may be controlled by two different mechanisms. Collagen type I/III ratio was seen to decrease progressively from grade II to grade IV BPD in comparison to age matched controls, indicating a higher proportion of type III collagen in the lungs of infants with BPD. From the clinical analysis and the results obtained from discriminant analysis procedure, it was seen that there was a high degree of correlation between the continuation of the disease and collagen accumulation in the lungs suggesting that pulmonary fibrosis with excessive collagen accumulation is an integral part of BPD. This fibrotic process seemed to correlate significantly with assisted ventilation and high oxygen supplementation received by the infants, but it was difficult to assess the individual contribution of the two treatments in the pathogenesis of BPD. Other variables such as severity of the initial disease and the length of survival of the infants, made the assessment of individual contribution much more difficult.
Mental Health Surveillance auf Länderebene – Psychiatrieberichterstattung in Bayern
Creators: name: Blank, Daniela
name: Redel, Rebekka
name: Tauscher, Martin
name: Kuhn, Joseph
Publisher: name: Robert Koch-Institut
Year: 2021
Subjects: subject: Psychische Gesundheit
subject: Psychiatrieberichterstattung
subject: Gesundheitsberichterstattung
subject: Indikatoren
subject: Bayern
subject: 610 Medizin und Gesundheit

description: Gesundheitsberichterstattung im Bereich Mental Health findet in Deutschland sowohl auf Bundes- wie auch auf Länder-und Kommunenebene statt. Auf Länderebene existieren verschiedene Konzepte und Herangehensweisen. In den Jahren 2020 und 2021 wurde gemäß Artikel 4 des Psychisch-Kranken-Hilfe-Gesetzes der erste Bayerische Psychiatriebericht erarbeitet. Wichtige Datengrundlagen sind dabei unter anderem die Abrechnungs- und Versorgungsdaten der Kassenärztlichen Vereinigung Bayerns und die Leistungsdaten der bayerischen Bezirke. Eine Abstimmung zwischen solchen Ländervorhaben und der nationalen Mental Health Surveillance, auch hinsichtlich der Nutzung von Versorgungsdaten, ist anzustreben.
High-resolution Depth Maps Imaging via Attention-based Hierarchical Multi-modal Fusion
Creators: name: Zhong, Zhiwei
name: Liu, Xianming
name: Jiang, Junjun
name: Zhao, Debin
name: Chen, Zhiwen
name: Ji, Xiangyang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Depth map records distance between the viewpoint and objects in the scene, which plays a critical role in many real-world applications. However, depth map captured by consumer-grade RGB-D cameras suffers from low spatial resolution. Guided depth map super-resolution (DSR) is a popular approach to address this problem, which attempts to restore a high-resolution (HR) depth map from the input low-resolution (LR) depth and its coupled HR RGB image that serves as the guidance. The most challenging problems for guided DSR are how to correctly select consistent structures and propagate them, and properly handle inconsistent ones. In this paper, we propose a novel attention-based hierarchical multi-modal fusion (AHMF) network for guided DSR. Specifically, to effectively extract and combine relevant information from LR depth and HR guidance, we propose a multi-modal attention based fusion (MMAF) strategy for hierarchical convolutional layers, including a feature enhance block to select valuable features and a feature recalibration block to unify the similarity metrics of modalities with different appearance characteristics. Furthermore, we propose a bi-directional hierarchical feature collaboration (BHFC) module to fully leverage low-level spatial information and high-level structure information among multi-scale features. Experimental results show that our approach outperforms state-of-the-art methods in terms of reconstruction accuracy, running speed and memory efficiency.
e-Science initiatives in Venezuela
Creators: name: Chaves, J. L.
name: Diaz, G.
name: Hamar, V.
name: Isea, R.
name: Rojas, F.
name: Ruiz, N.
name: Torrens, R.
name: Uzcategui, M.
name: Florez-Lopez, J.
name: Hoeger, H.
name: Mendoza, C.
name: Nunez, L. A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: Within the context of the nascent e-Science infrastructure in Venezuela, we describe several web-based scientific applications developed at the Centro Nacional de Calculo Cientifico Universidad de Los Andes (CeCalCULA), Merida, and at the Instituto Venezolano de Investigaciones Cientificas (IVIC), Caracas. The different strategies that have been followed for implementing quantum chemistry and atomic physics applications are presented. We also briefly discuss a damage portal based on dynamic, nonlinear, finite elements of lumped damage mechanics and a biomedical portal developed within the framework of the \textit{E-Infrastructure shared between Europe and Latin America} (EELA) initiative for searching common sequences and inferring their functions in parasitic diseases such as leishmaniasis, chagas and malaria.
description: 9 pages, 4 figures
Form Factors of the Heisenberg Spin Chain in the Thermodynamic Limit: Dealing with Complex Bethe Roots
Creators: name: Kitanine, Nikolai
name: Kulkarni, Giridhar
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mathematical Physics (math-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences
subject: 81U15

description: In this article we study the thermodynamic limit of the form factors of the XXX Heisenberg spin chain using the algebraic Bethe ansatz approach. Our main goal is to express the form factors for the low-lying excited states as determinants of matrices that remain finite dimensional in the thermodynamic limit. We show how to treat all types of the complex roots of the Bethe equations within this framework. In particular we demonstrate that the Gaudin determinant for the higher level Bethe equations arises naturally from the algebraic Bethe ansatz.
On the Hausdorff dimension of invariant measures of weakly contracting on average measurable IFS
Creators: name: Jaroszewska, Joanna
name: Rams, Michal
Publisher: name: arXiv
Year: 2007
Subjects: subject: Dynamical Systems (math.DS)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 28A78 (Primary); 28D99 (Secondary)

description: We consider measures which are invariant under a measurable iterated function system with positive, place-dependent probabilities in a separable metric space. We provide an upper bound of the Hausdorff dimension of such a measure if it is ergodic. We also prove that it is ergodic iff the related skew product is.
description: 16 pages; to appear in Journal of Stat. Phys
Loophole free interferometric test of macrorealism using heralded single photons
Creators: name: Joarder, Kaushik
name: Saha, Debashis
name: Home, Dipankar
name: Sinha, Urbasi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We show unambiguous violations of different macrorealist inequalities, like the LGI and the WLGI using a heralded, single-photon based experimental setup comprising one Mach-Zehnder interferometer followed by a displaced Sagnac one. The negative result measurements (NRM) are implemented in order to validate the presumption of non-invasive measurability used in defining macrorealism. Among all the experiments to date testing macrorealism, the present experiment stands out in comprehensively addressing the relevant loopholes. The clumsiness loophole is addressed through precision testing of any classical invasiveness involved in the implementation of NRMs. This is done by suitably choosing the experimental parameters so that the quantum mechanically (QM) predicted validity of all the relevant two-time no-signalling in time (NSIT) conditions is maintained in all the three pairwise experiments performed to show LGI/WLGI violation. Further, importantly, the detection efficiency loophole is addressed by adopting suitable modifications in the measurement strategy enabling the demonstration of the violation of LGI/WLGI for any non-zero detection efficiency. We also show how other relevant loopholes like the multiphoton emission loophole, coincidence loophole, and the preparation state loophole are all closed in the present experiment. We report the LGI violation of $1.32 \pm 0.04$ and the WLGI violation of $0.10 \pm 0.02$, where the magnitudes of violation are respectively 8 times and 5 times the corresponding error values, while agreeing perfectly with the ranges of the QM predicted values of the LGI, WLGI expressions that we estimate by taking into account the non-idealities of the actual experiment. Simultaneously, the experimentally observed probabilities satisfy all the two-time NSIT conditions up to the order of $10^{-2}$, which ensures non-invasiveness in the implemented NRMs.
description: 31 pages, 7 figures, version to appear in PRX Quantum
Cohomology of the minimal nilpotent orbit
Creators: name: Juteau, Daniel
Publisher: name: arXiv
Year: 2007
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 20G99

description: We compute the integral cohomology of the minimal non-trivial nilpotent orbit in a complex simple (or quasi-simple) Lie algebra. We find by a uniform approach that the middle cohomology group is isomorphic to the fundamental group of the sub-root system generated by the long simple roots. The modulo $\ell$ reduction of the Springer correspondent representation involves the sign representation exactly when $\ell$ divides the order of this cohomology group. The primes dividing the torsion of the rest of the cohomology are bad primes.
description: 29 pages, v2 : Leray-Serre spectral sequence replaced by Gysin sequence only, corrected typos
Shadow and deflection angle of charged rotating black hole surrounded by perfect fluid dark matter
Creators: name: Atamurotov, Farruh
name: Papnoi, Uma
name: Jusufi, Kimet
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We analysed the shadow cast by charged rotating black hole (BH) in presence of perfect fluid dark matter (PFDM). We studied the null geodesic equations and obtained the shadow of the charged rotating BH to see the effects of PFDM parameter $γ$, charge $Q$ and rotation parameter $a$, and it is noticed that the size as well as the shape of BH shadow is affected due to PFDM parameter, charge and rotation parameter. Thus, it is seen that the presence of dark matter around a BH affects its spacetime. We also investigated the influence of all the parameters (PFDM parameter $γ$, BHs charge $Q$ and rotational parameter $a$) on effective potential, energy emission by graphical representation, and compare all the results with the non rotating case in usual general relativity. To this end, we have also explored the effect of PFDM on the deflection angle and the size of Einstein rings.
description: 14 pages, 7 figures, 1 table, accepted for publication in Class. Quantum Grav
Exact Extended Supersymmetry on a Lattice: Twisted N=4 Super Yang-Mills in Three Dimensions
Creators: name: D'Adda, Alessandro
name: Kanamori, Issaku
name: Kawamoto, Noboru
name: Nagata, Kazuhiro
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We propose a lattice formulation of three dimensional super Yang-Mills model with a twisted N=4 supersymmetry. The extended supersymmetry algebra of all the eight supercharges is fully and exactly realized on the lattice with a modified "Leibniz rule". The formulation we employ here is a three dimensional extension of manifestly gauge covariant method which was developed in our previous proposal of Dirac-Kaehler twisted N=2 super Yang-Mills on two dimensional lattice. The twisted N=4 supersymmetry algebra is geometrically realized on a three dimensional lattice with link supercharges and the use of "shifted" (anti-)commutators. A possible solution to the recent critiques on the link formulation will be discussed.
description: 17 pages, 11 figures; v2 a reference added; v3 appendix added
Fourteen New Companions from the Keck & Lick Radial Velocity Survey Including Five Brown Dwarf Candidates
Creators: name: Patel, Shannon G.
name: Vogt, Steven S.
name: Marcy, Geoffrey W.
name: Johnson, John A.
name: Fischer, Debra A.
name: Wright, Jason T.
name: Butler, R. Paul
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present radial velocities for 14 stars on the California & Carnegie Planet Search target list that reveal new companions. One star, HD 167665, was fit with a definitive Keplerian orbit leading to a minimum mass for the companion of 50.3 Mjup at a separation from its host of ~5.5 AU. Incomplete or limited phase coverage for the remaining 13 stars prevents us from assigning to them unique orbital parameters. Instead, we fit their radial velocities with Keplerian orbits across a grid of fixed values for Msini and period, P, and use the resulting reduced chi-square surface to place constraints on Msini, P, and semimajor axis, a. This technique allowed us to restrict Msini below the brown dwarf -- stellar mass boundary for an additional 4 companions (HD 150554, HD 8765, HD 72780, HD 74014). If the combined 5 companions are confirmed as brown dwarfs, these results would comprise the first major catch of such objects from our survey beyond ~3 AU.
description: 29 pages, 14 figures, accepted to ApJ
The Kinetostatic Optimization of a Novel Prismatic Drive
Creators: name: Chablat, Damien
name: Caro, Stéphane
Publisher: name: arXiv
Year: 2007
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: The design of a mechanical transmission taking into account the transmitted forces is reported in this paper. This transmission is based on Slide-o-Cam, a cam mechanism with multiple rollers mounted on a common translating follower. The design of Slide-o-Cam, a transmission intended to produce a sliding motion from a turning drive, or vice versa, was reported elsewhere. This transmission provides pure-rolling motion, thereby reducing the friction of rack-and-pinions and linear drives. The pressure angle is a suitable performance index for this transmission because it determines the amount of force transmitted to the load vs. that transmitted to the machine frame. To assess the transmission capability of the mechanism, the Hertz formula is introduced to calculate the stresses on the rollers and on the cams. The final transmission is intended to replace the current ball-screws in the Orthoglide, a three-DOF parallel robot for the production of translational motions, currently under development for machining applications at Ecole Centrale de Nantes.
Zakharov simulation study of spectral features of on-demand Langmuir turbulence in an inhomogeneous plasma
Creators: name: Eliasson, Bengt
name: Thidé, Bo
Publisher: name: arXiv
Year: 2007
Subjects: subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: We have performed a simulation study of Langmuir turbulence in the Earth's ionosphere by means of a Zakharov model with parameters relevant for the F layer. The model includes dissipative terms to model collisions and Landau damping of the electrons and ions, and a linear density profile, which models the ionospheric plasma inhomogeneity whose length scale is of the order 10--100 km. The injection of energy into the system is modeled by a constant source term in the Zakharov equation. Langmuir turbulence is excited ``on-demand'' in controlled ionospheric modification experiments where the energy is provided by an HF radio beam injected into the overhead ionospheric plasma. The ensuing turbulence can be studied with radars and in the form of secondary radiation recorded by ground-based receivers. We have analyzed spectral signatures of the turbulence for different sets of parameters and different altitudes relative to the turning point of the linear Langmuir mode where the Langmuir frequency equals the local plasma frequency. By a parametric analysis, we have derived a simple scaling law, which links the spectral width of the turbulent frequency spectrum to the physical parameters in the ionosphere. The scaling law provides a quantitative relation between the physical parameters (temperatures, electron number density, ionospheric length scale, etc.) and the observed frequency spectrum. This law may be useful for interpreting experimental results.
description: 7 pages, 8 figures
Non-contact Pain Recognition from Video Sequences with Remote Physiological Measurements Prediction
Creators: name: Yang, Ruijing
name: Guan, Ziyu
name: Yu, Zitong
name: Feng, Xiaoyi
name: Peng, Jinye
name: Zhao, Guoying
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Automatic pain recognition is paramount for medical diagnosis and treatment. The existing works fall into three categories: assessing facial appearance changes, exploiting physiological cues, or fusing them in a multi-modal manner. However, (1) appearance changes are easily affected by subjective factors which impedes objective pain recognition. Besides, the appearance-based approaches ignore long-range spatial-temporal dependencies that are important for modeling expressions over time; (2) the physiological cues are obtained by attaching sensors on human body, which is inconvenient and uncomfortable. In this paper, we present a novel multi-task learning framework which encodes both appearance changes and physiological cues in a non-contact manner for pain recognition. The framework is able to capture both local and long-range dependencies via the proposed attention mechanism for the learned appearance representations, which are further enriched by temporally attended physiological cues (remote photoplethysmography, rPPG) that are recovered from videos in the auxiliary task. This framework is dubbed rPPG-enriched Spatio-Temporal Attention Network (rSTAN) and allows us to establish the state-of-the-art performance of non-contact pain recognition on publicly available pain databases. It demonstrates that rPPG predictions can be used as an auxiliary task to facilitate non-contact automatic pain recognition.
description: IJCAI 2021
Weighted $L^2$-contractivity of Langevin dynamics with singular potentials
Creators: name: Camrud, Evan
name: Herzog, David P.
name: Stoltz, Gabriel
name: Gordina, Maria
Publisher: name: arXiv
Year: 2021
Subjects: subject: Probability (math.PR)
subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 60H10, 35Q84, 60J60 (Primary) 35B40 (Secondary)

description: Convergence to equilibrium of underdamped Langevin dynamics is studied under general assumptions on the potential $U$ allowing for singularities. By modifying the direct approach to convergence in $L^2$ pioneered by F. Hérau and developped by Dolbeault, Mouhot and Schmeiser, we show that the dynamics converges exponentially fast to equilibrium in the topologies $L^2(dμ)$ and $L^2(W^* dμ)$, where $μ$ denotes the invariant probability measure and $W^*$ is a suitable Lyapunov weight. In both norms, we make precise how the exponential convergence rate depends on the friction parameter $γ$ in Langevin dynamics, by providing a lower bound scaling as $\min(γ, γ^{-1})$. The results hold for usual polynomial-type potentials as well as potentials with singularities such as those arising from pairwise Lennard-Jones interactions between particles.