cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Time-dependent perturbation theory for vibrational energy relaxation and dephasing in peptides and proteins
Creators: name: Fujisaki, Hiroshi
name: Zhang, Yong
name: Straub, John E.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Biomolecules (q-bio.BM)
subject: FOS: Biological sciences

description: Without invoking the Markov approximation, we derive formulas for vibrational energy relaxation (VER) and dephasing for an anharmonic system oscillator using a time-dependent perturbation theory. The system-bath Hamiltonian contains more than the third order coupling terms since we take a normal mode picture as a zeroth order approximation. When we invoke the Markov approximation, our theory reduces to the Maradudin-Fein formula which is used to describe VER properties of glass and proteins. When the system anharmonicity and the renormalization effect due to the environment vanishes, our formulas reduce to those derived by Mikami and Okazaki invoking the path-integral influence functional method [J. Chem. Phys. 121 (2004) 10052]. We apply our formulas to VER of the amide I mode of a small amino-acide like molecule, N-methylacetamide, in heavy water.
description: 16 pages, 5 figures, 5 tables, submitted to J. Chem. Phys
Evolutionary constraints on the masses of the components of HDE 226868/Cyg X-1 binary system
Creators: name: Ziolkowski, J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Calculations carried out to model the evolution of HDE 226868, under different assumptions about the stellar wind mass loss rate, provide robust limits on the present mass of the star. It has to be in the range 40 +- 5 solar masses if the distance to the system is in the range 1.95 to 2.35 kpc and the effective temperature of HDE 226868 in the range 30000 to 31000 K. Extending the possible intervals of these parameters to 1.8 to 2.35 kpc and 28000 to 32000 K, one gets for the mass of the star the range 40 +- 10 solar masses. Including into the analysis observational properties such as the profiles of the emission lines, rotational broadening of the absorption lines and the ellipsoidal light variations, one can estimate also the mass of the compact component. It has to be in the ranges 20 +- 5 solar masses and 13.5 to 29 solar masses for the cases described above. The same analysis (using the evolutionary models and the observational properties listed above) yields lower limit to the distance to the system of about 2.0 kpc, if the effective temperature of HDE 226868 is higher than 30000 K. This limit to the distance does not depend on any photometric or astrometric considerations.
description: 11 pages, 4 figures, accepted for publication in MNRAS
Constraints on backreaction in dust universes
Creators: name: Rasanen, Syksy
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study backreaction in dust universes using exact equations which do not rely on perturbation theory, concentrating on theoretical and observational constraints. In particular, we discuss the recent suggestion (in hep-th/0503117) that superhorizon perturbations could explain present-day accelerated expansion as a useful example which can be ruled out. We note that a backreaction explanation of late-time acceleration will have to involve spatial curvature and subhorizon perturbations.
description: 15 pages, 1 figure. v2: The numbers in observational constraints corrected (no qualitative change), added discussion and references. v3: More references, clearer presentation, a new section on theoretical bounds. Conclusions stronger. v4: Published version. No major changes
Ti alloyed $α$-Ga$_2$O$_3$: route towards wide band gap engineering
Creators: name: Barthel, A.
name: Roberts, J. W.
name: Napari, M.
name: Huq, T. N.
name: Kovács, A.
name: Oliver, R. A.
name: Chalker, P. R.
name: Sajavaara, T.
name: Massabuau, F. C-P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The suitability of Ti as a band gap modifier for $α$-Ga$_2$O$_3$ was investigated, taking advantage of the isostructural α-phases and high band gap difference between Ti$_2$O$_3$ and Ga$_2$O$_3$. Films of Ti:Ga$_2$O$_3$, with a range of Ti concentrations, synthesized by atomic layer deposition on sapphire substrates, were characterized to determine how crystallinity and band gap vary with composition for this alloy. The deposition of crystalline $α$-(Ti$_x$Ga$_{1-x}$)$_2$O$_3$ films with up to x~5.3%, was demonstrated. At greater Ti concentration, the films became amorphous. Modification of the band gap over a range of ~ 270 meV was achieved across the crystalline films and a maximum change in band gap from pure $α$-Ga$_2$O$_3$ of ~1.1 eV was observed for the films of greatest Ti fraction (61% Ti relative to Ga). The ability to maintain a crystalline phase at low fractions of Ti, accompanied by a significant modification in band gap shows promise for band gap engineering and the enhancement in versatility of application of $α$-Ga$_2$O$_3$ in optoelectronic devices.
description: 12 pages, 5 figures, 1 table
Relativistic MHD Simulations of Jets with Toroidal Magnetic Fields
Creators: name: Mignone, A.
name: Massaglia, S.
name: Bodo, G.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: This paper presents an application of the recent relativistic HLLC approximate Riemann solver by Mignone & Bodo to magnetized flows with vanishing normal component of the magnetic field. The numerical scheme is validated in two dimensions by investigating the propagation of axisymmetric jets with toroidal magnetic fields. The selected jet models show that the HLLC solver yields sharper resolution of contact and shear waves and better convergence properties over the traditional HLL approach.
description: 12 pages, 5 figures
Monocular Human Pose Estimation: A Survey of Deep Learning-based Methods
Creators: name: Chen, Yucheng
name: Tian, Yingli
name: He, Mingyi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Vision-based monocular human pose estimation, as one of the most fundamental and challenging problems in computer vision, aims to obtain posture of the human body from input images or video sequences. The recent developments of deep learning techniques have been brought significant progress and remarkable breakthroughs in the field of human pose estimation. This survey extensively reviews the recent deep learning-based 2D and 3D human pose estimation methods published since 2014. This paper summarizes the challenges, main frameworks, benchmark datasets, evaluation metrics, performance comparison, and discusses some promising future research directions.
description: This version corresponds to the pre-print of the paper accepted for Computer Vision and Image Understanding (CVIU)
ETHIOPIA
Creators: name: Beintema, Nienke M.
name: Salomon, Menelik
name: Beintema, Nienke M.
name: Salomon, Menelik
Publisher: name: Unknown
Year: 2003
Subjects: Research and Development/Tech Change/Emerging Technologies

description: This country brief reviews the major investment and institutional trends in Ethiopian agricultural research since the early 1970s, including a new set of survey data for the 1990s collected through the Agricultural Science and Technology Indicators (ASTI) initiative (IFPRI–ISNAR–ASARECA 2001– 02).
Singular Sums of Squares of Degenerate Vector Fields
Creators: name: Bove, Antonio
name: Derridj, Makhlouf
name: Kohn, Joseph J.
name: Tartakoff, David S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Analysis of PDEs (math.AP)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 35H10

description: We simplify and give an alternative proof of hypoellipticity for generalizations of the singular sum of squares of complex vector fields studied by Kohn, with an appendix by Derridj and Tartakoff, in the Annals of Mathematics, vol. 162 no. 2, 2005, pp. 943-986. The main generalization is that the complex vector fields now come from domains of finite type. We also prove real analytic hypoellipticity and the optimality of our estimates.
description: 19 pages
CLIMATE CHANGE AS AN INVESTMENT RISK: ASSET OWNERS PERSPECTIVE
Creators: name: Kirjanas, Pavel
Publisher: name: figshare
Year: 2020
Subjects: subject: 150205 Investment and Risk Management
subject: FOS: Economics and business
subject: Climate Science

description: A growing evidence suggests that climate change should be viewed as a financial risk that has to be factored into investment decision making. This study has taken a look at how institutional asset owners view their portfolio exposure to climate investment risk. The topical literature and existing to date research was reviewed. The interviews with the representatives of UK's largest institutional asset owners were carried out. The study found that the climate investment risk is largely recognised among institutional asset owners, though levels of recognition vary. Generally, the risk is perceived to be lower and less probable than that projected by researchers. The underlying causes of varying degrees of climate investment risk recognition are found to be in short-termist approach to investment and high reliance on third parties to manage climate investment risk.
KENYA
Creators: name: Beintema, Nienke M.
name: Murithi, Festus M.
name: Mwangi, Peterson
name: Beintema, Nienke M.
name: Murithi, Festus M.
name: Mwangi, Peterson
Publisher: name: Unknown
Year: 2003
Subjects: Research and Development/Tech Change/Emerging Technologies

description: This country brief reviews the major investment and institutional trends in Kenya’s agricultural research since the early 1970s, including a new set of survey data for the 1990s collected under the Agricultural Science and Technology Indicators (ASTI) initiative (IFPRI–ISNAR–ASARECA 2001– 02).1
First principles investigation of ferroelectricity in epitaxially strained Pb$_2$TiO$_4$
Creators: name: Fennie, Craig J.
name: Rabe, Karin M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The structure and polarization of the as-yet hypothetical Ruddlesden-Popper compound Pb$_2$TiO$_4$ are investigated within density-functional theory. Zone enter phonons of the high-symmetry K$_2$NiF$_4$-type reference structure, space group $I4/mmm$, were calculated. At the theoretical ground-state lattice constants, there is one unstable infrared-active phonon. This phonon freezes in to give the $I2mm$ ferroelectric state. As a function of epitaxial strain, two additional ferroelectric phases are found, with space groups $I4mm$ and $F2mm$ at compressive and tensile strains, respectively.
description: 4 pages, 4 figures
Social support and social strain among husbands and wives in stepfamilies : a multilevel analysis
Creators: name: Capreol, Martha Jean
Publisher: name: University of British Columbia
Year: 2009

description: In response to recent calls in the literature for a more contextual analysis of the influence of social support processes (e.g., Rook, 1997; Sarason, Sarason, & Pierce, 1992), the current study explores the relationships of spousal support, spousal strain, and well-being among husbands and wives, both within the same day and across days. In addition, the moderating roles of interpersonal and situational contexts within which support and strain are provided are examined. One hundred and sixty-six husbands and wives in stepfamilies were interviewed and then asked to complete a structured diary twice daily for a week. Participants reported their stress, supportive and problematic spousal interactions, mood, and dyadic adjustment. A multi-level hierarchical model was used to estimate average within-person relations among the daily variables, while at the same time controlling for the influence of between-person differences in these variables. Lack of daily spousal support and the presence of spousal strain were both significantly associated with increased negative affect across the same day, although the magnitude of the effect of spousal strain was greater. However, these associations were mitigated for participants who perceived their marriages to be well-adjusted. In addition, daily stressors were directly associated with increased same day negative affect, however daily stressors did not interact with support or strain to predict distress. In contrast, the pattern of the findings for the prediction of negative affect across days was quite different. Of the daily variables, only spousal support, but not spousal strain or daily hassles, was a significant direct predictor of negative affect the next morning. Furthermore, spousal support and spousal strain were found to have a multiplicative association with negative affect the next day. Specifically, the presence of spousal strain attenuated the beneficial impact of spousal support on mood. Further, dyadic adjustment was a direct predictor of decreased negative affect the next day. The findings from this study suggest an interplay among social support, social strain, and well-being. In particular, the importance of considering differential influences over time for support and strain, as well as the moderating roles of proximal and distal relationship factors, was highlighted.
Taming the Gerrymander--Statistical Physics Approach to Political Districting Problem
Creators: name: Chou, Chung-I
name: Li, Sai-Ping
Publisher: name: arXiv
Year: 2005
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: The Political Districting Problem is mapped to a $q$-state Potts model in which the constraints can be written as interactions between sites or external fields acting on the system. Districting into $q$ voter districts is equivalent to finding the ground state of this $q$-state Potts model. We illustrate this by districting Taipei city in its 2008 Legislature Election. Statistical properties of the model are also studied.
description: 9 pages, 8 figures
Conformality Emergent In String Phenomenology
Creators: name: Frampton, Paul H.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Use of the AdS/CFT correspondence to arrive at phenomenological gauge field theories is discussed, focusing on the orbifolded case without supersymmetry. An abelian orbifold with the finite group Z_p can give rise to a G = U(N)^p gauge group with chiral fermions and complex scalars in different bi-fundamental representations of G. The naturalness issue is discussed, particularly the absence of quadratic divergences in the scalar propagator at one loop. This requires that the scalars all be in bi-fundamentals with no adjoints, coincident with the necessary and sufficient condition for presence of chiral fermions. Speculations are made concerning new gauge and matter particles expected soon to be pursued experimentally at the LHC.
description: 7 pages pdf file. Talk at PASCOS 2005 Symposium. Gyeongju, Korea. May 30 - June 4, 2005
Enhanced transport of spin-orbit coupled Bose gases in disordered potentials
Creators: name: Yue, Y.
name: de Melo, C. A. R. Sá
name: Spielman, I. B.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Anderson localization is a single particle localization phenomena in disordered media that is accompanied by an absence of diffusion. Spin-orbit coupling (SOC) describes an interaction between a particle's spin and its momentum that directly affects its energy dispersion, for example creating dispersion relations with gaps and multiple local minima. We show theoretically that combining one-dimensional spin-orbit coupling with a transverse Zeeman field suppresses the effects of disorder, thereby increasing the localization length and conductivity. This increase results from a suppression of back scattering between states in the gap of the SOC dispersion relation. Here, we focus specifically on the interplay of disorder from an optical speckle potential and SOC generated by two-photon Raman processes in quasi-1D Bose-Einstein condensates. We first describe back-scattering using a Fermi's golden rule approach, and then numerically confirm this picture by solving the time-dependent 1D Gross Pitaevskii equation for a weakly interacting Bose-Einstein condensate with SOC and disorder. We find that on the 10's of millisecond time scale of typical cold atom experiments moving in harmonic traps, initial states with momentum in the zero-momentum SOC gap evolve with negligible back-scattering, while without SOC these same states rapidly localize.
description: 12 pages, 7 figures
An Empirical Methodology for Detecting and Prioritizing Needs during Crisis Events
Creators: name: Sarol, M. Janina
name: Dinh, Ly
name: Rezapour, Rezvaneh
name: Chin, Chieh-Li
name: Yang, Pingjing
name: Diesner, Jana
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computation and Language (cs.CL)
subject: Information Retrieval (cs.IR)
subject: Social and Information Networks (cs.SI)
subject: FOS: Computer and information sciences

description: In times of crisis, identifying the essential needs is a crucial step to providing appropriate resources and services to affected entities. Social media platforms such as Twitter contain vast amount of information about the general public's needs. However, the sparsity of the information as well as the amount of noisy content present a challenge to practitioners to effectively identify shared information on these platforms. In this study, we propose two novel methods for two distinct but related needs detection tasks: the identification of 1) a list of resources needed ranked by priority, and 2) sentences that specify who-needs-what resources. We evaluated our methods on a set of tweets about the COVID-19 crisis. For task 1 (detecting top needs), we compared our results against two given lists of resources and achieved 64% precision. For task 2 (detecting who-needs-what), we compared our results on a set of 1,000 annotated tweets and achieved a 68% F1-score.
A Spitzer Study of Dusty Disks in the Scorpius-Centaurus OB Association
Creators: name: Chen, C. H.
name: Jura, M.
name: Gordon, K. D.
name: Blaylock, M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have obtained Spitzer Space Telescope MIPS observations of 40 F- and G-type common proper motion members of the Scorpius-Centaurus OB Association with ages between 5 and 20 Myr at 24 micron and 70 micron. We report the detection of fourteen objects which possess 24 micron fluxes >30% larger than their predicted photospheres, tentatively corresponding to a disk fraction of >35%, including seven objects which also possess 70 micron excesses >100 times larger than their predicted photospheres. The 24 micron plus 70 micron excess sources possess high fractional infrared luminosities, LIR/L* = 7.0e-4 - 3.0e-3; either they possess optically thin, dusty beta Pictoris-like disks or compact, opaque HD 98800-like disks.
description: 12 pages, 3 figures (including 1 color figure). ApJ, in press
Globular cluster systems in low-luminosity early-type galaxies near the Fornax Cluster centre
Creators: name: Bassino, Lilia P.
name: Richtler, Tom
name: Dirsch, Boris
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a photometric study of the globular cluster systems of the Fornax cluster galaxies NGC 1374, NGC 1379, and NGC 1387. The data consists of images from the wide-field MOSAIC Imager of the CTIO 4-m telescope, obtained with Washington C and Kron-Cousins R filters. The images cover a field of 36 x 36 arcmin, corresponding to 200 x 200 kpc at the Fornax distance. Two of the galaxies, NGC 1374 and NGC 1379, are low-luminosity ellipticals while NGC 1387 is a low-luminosity lenticular. Their cluster systems are still embedded in the cluster system of NGC 1399. Therefore the use of a large field is crucial and some differences to previous work can be explained by this. The colour distributions of all globular cluster systems are bimodal. NGC 1387 presents a particularly distinct separation between red and blue clusters and an overproportionally large population of red clusters. The radial distribution is different for blue and red clusters, red clusters being more concentrated towards the respective galaxies. The different colour and radial distributions point to the existence of two globular cluster subpopulations in these galaxies. Specific frequencies are in the range S_N= 1.4-2.4, smaller than the typical values for elliptical galaxies. These galaxies might have suffered tidal stripping of blue globular clusters by NGC 1399.
description: 14 pages, 12 figures. Accepted for publication in MNRAS
Communication Over MIMO Broadcast Channels Using Lattice-Basis Reduction
Creators: name: Taherzadeh, Mahmoud
name: Mobasher, Amin
name: Khandani, Amir K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: A simple scheme for communication over MIMO broadcast channels is introduced which adopts the lattice reduction technique to improve the naive channel inversion method. Lattice basis reduction helps us to reduce the average transmitted energy by modifying the region which includes the constellation points. Simulation results show that the proposed scheme performs well, and as compared to the more complex methods (such as the perturbation method) has a negligible loss. Moreover, the proposed method is extended to the case of different rates for different users. The asymptotic behavior of the symbol error rate of the proposed method and the perturbation technique, and also the outage probability for the case of fixed-rate users is analyzed. It is shown that the proposed method, based on LLL lattice reduction, achieves the optimum asymptotic slope of symbol-error-rate (called the precoding diversity). Also, the outage probability for the case of fixed sum-rate is analyzed.
description: Submitted to IEEE Trans. on Info. Theory (Jan. 15, 2006), Revised (Jun. 12, 2007)
Decision-making in the fisheries industry : design of a catch-allocation decision tool
Creators: name: Morrison, Laura Jean
Publisher: name: University of British Columbia
Year: 2009

description: This thesis presents a catch allocation model that was developed for J.S. McMillan Fisheries, Ltd. A linear program (LP) was developed to allocate chum salmon catches of variable size to a set of end products, where both the input salmon and output products are differentiated based on strict physical characteristics and quality requirements. The LP is designed to maximise the net profit of a catch subject to constraints on processing line capacity, market orders, and an upper boundary on production. A decision support tool was built around the LP model to facilitate user-directed reporting and updating of model parameters. The decision tool was shown to improve the structuring of the decision process, decrease the company's reliance on expert knowledge in making the catch allocation decision, as well as significantly decrease the time investment in the decision process.
Gaussian and non-Gaussian speckle fluctuations in the diffusing-wave spectroscopy signal of a coarsening foam
Creators: name: Gittings, A. S.
name: Durian, D. J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: All prior applications of Diffusing-Wave Spectroscopy (DWS) to aqueous foams rely upon the assumption that the electric field of the detected light is a Gaussian random variable and that, hence, the Siegert relation applies. Here we test this crucial assumption by simultaneous measurement of both second and third-order temporal intensity correlations. We find that the electric field is Gaussian for typical experimental geometries equivalent to illumination and detection with a plane wave, both for backscattering and transmission through an optically-thick slab. However, we find that the Gaussian character breaks down for point-in / point-out backscattering geometries in which the illumination spot size is not sufficiently large in comparison with the size of the intermittent rearrangement events.
description: experiment, available at http://www.opticsinfobase.org/abstract.cfm?URI=ao-45-10-2199
Platelet-bacterial interactions in the pathogenesis of infective endocarditis. Part II: The Staphylococcus
Creators: name: Kerrigan, Steven
Publisher: name: Royal College of Surgeons in Ireland
Year: 2022
Subjects: subject: 111502 Clinical Pharmacology and Therapeutics
subject: FOS: Clinical medicine

description: Infective Endocarditis is a microbial infection characterised by the presence of septic vegetations on the surface of the endocardium (Moreillon and Que, 2004). Infection most commonly occurs on the heart valves that has been damaged by congenital defects such as previous disease or trauma (Durack, 1995). As a result these sites have the ability to generate turbulent blood flow which in turn can cause damage to inner most lining of the blood vessels, the endothelium, which causes surface damage leading to exposure of underlying matrix protein (Ruggeri, 2009). Once exposed this highly thrombogenic surface leads to rapid platelet deposition and the formation of a fibrin network. Circulating bacteria from a transient bacteremia in turn binds to this sterile platelet fibrin nidus which allows a secondary accumulation of platelets that encase the bacteria leading to stable thrombus formation (Moreillon and Que, 2004). Despite improvements in medical and surgical therapy, invasive staphylococcal disease causing infective endocarditis is still associated with a severe prognosis and remains a significant therapeutic challenge. Once a disease primarily affecting younger patients presenting with rheumatic heart disease, modern times see a significant increase in newer ‘at risk’ categories including patients with long term indwelling central venous catheters, patients undergoing haemodialysis and invasive intravascular procedures such as arthroplasty, immunocompromized patients and intraveneous drug abusers (Thuny et al., 2012). Treatment of infective endocarditis usually requires a multidisciplinary approach involving specialists in infectious disease, cardiologists and cardiac surgeons. Current treatment regimes consist of aggressive prolonged antibiotic therapy, frequently combined with surgery (Prendergast and Tornos, 2010, Wilson et al., 2007). Prolonged antibiotic use is often less than successful as 40% of patients relapse within 2 months of finishing clinically effective therapy.
MPEC 2024-A126 : 2020 DY1
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Élaboration d'un processus pour les images 3D reposant sur IIIF (Poster)
Creators: name: Julien A. Raemy
name: Rita Gautschy
Publisher: name: Zenodo
Year: 2023
Subjects: 3D
API
DaSCH
Dissémination
IIIF
Préservation
Sémantique
Visualisation

description: Nous soulevons des interrogations et présentons un certain nombre de défis et d'opportunités liés à la conception d'un processus permettant de gérer les images en trois dimensions (3D), de la préservation à long terme à leur dissémination, selon la perspective du DaSCH, une infrastructure nationale suisse pour les données de la recherche en sciences humaines. Pour établir ce processus, nous avons conçus des lignes directrices tenant particulièrement compte du travail d'interopérabilité effectué par la communauté IIIF sur la 3D.

Lien vers la publication associée parue au sein du Recueil des communications du 4e colloque Humanistica : https://hal.science/hal-04099506
Semi-classical wormholes and time machines are unstable
Creators: name: Buniy, Roman V.
name: Hsu, Stephen D. H.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We show that Lorentzian (traversable) wormholes and time machines with semi-classical spacetimes are unstable due to their violation of the null energy condition (NEC). Semi-classicality of the energy-momentum tensor in a given quantum state (required for semi-classicality of the spacetime) implies localization of its wavefunction in phase space, leading to evolution according to the classical equations of motion. Previous results related to violation of the NEC then require that the configuration is unstable to small perturbations.
description: 3 pages, 1 figure, revtex
PROPOSED NEW ENVIRONMENTAL LEGISLATION AFFECTING CANADIAN AGRICULTURE; A SPECIAL REPORT
Creators: name: Brethour, Cher
name: MacGowan, Peter
name: Mussell, Al
name: Mayer, Holly
name: Brethour, Cher
name: MacGowan, Peter
name: Mussell, Al
name: Mayer, Holly
Publisher: name: Unknown
Year: 2002
Subjects: Environmental Economics and Policy

description: Over the last several months there have been numerous moves toward the establishment of new environmental protection standards specifically related to farming operations in various provinces. Existing and proposed provincial requirements regarding nutrient management and environmental standards on farms are at the forefront of many farm and environmentalist groups' agendas. The public is paying more attention to the impact of farming operations on both the natural environment and human health. In particular, a great deal of attention has been focussed on how the improper handling and application of manure may contaminate surface water, groundwater, air quality and soil. All of these factors have led to the exploration of regulatory options. Depending on whether the new environmental regulatory regime imposes more stringent standards (rather than imposing a mandatory regime which is consistent with voluntary standards already followed by many producers), production costs, structure, and the overall nature of Canadian farming operations may be impacted. This special report identifies the key components of agricultural operations environmental legislation in Ontario and Alberta, and compares and contrasts the legislative and regulatory approaches and the driving forces behind the introduction of the legislation in these two jurisdictions. While the report focuses on the legislative initiatives underway in Ontario and Alberta, it should be kept in mind that similar initiatives have also been undertaken in Quebec. Competitive pressures and a public demand for consistent agricultural operations environmental standards across Canada mean that the precedents established in any particular province or provinces are likely to be followed to a significant degree across Canada.
Platelet-bacterial interactions in the pathogenesis of infective endocarditis. Part II: The Staphylococcus
Creators: name: Kerrigan, Steven W.
Publisher: name: Royal College of Surgeons in Ireland
Year: 2019
Subjects: subject: 111502 Clinical Pharmacology and Therapeutics
subject: FOS: Clinical medicine

description: Infective Endocarditis is a microbial infection characterised by the presence of septic vegetations on the surface of the endocardium (Moreillon and Que, 2004). Infection most commonly occurs on the heart valves that has been damaged by congenital defects such as previous disease or trauma (Durack, 1995). As a result these sites have the ability to generate turbulent blood flow which in turn can cause damage to inner most lining of the blood vessels, the endothelium, which causes surface damage leading to exposure of underlying matrix protein (Ruggeri, 2009). Once exposed this highly thrombogenic surface leads to rapid platelet deposition and the formation of a fibrin network. Circulating bacteria from a transient bacteremia in turn binds to this sterile platelet fibrin nidus which allows a secondary accumulation of platelets that encase the bacteria leading to stable thrombus formation (Moreillon and Que, 2004). Despite improvements in medical and surgical therapy, invasive staphylococcal disease causing infective endocarditis is still associated with a severe prognosis and remains a significant therapeutic challenge. Once a disease primarily affecting younger patients presenting with rheumatic heart disease, modern times see a significant increase in newer ‘at risk’ categories including patients with long term indwelling central venous catheters, patients undergoing haemodialysis and invasive intravascular procedures such as arthroplasty, immunocompromized patients and intraveneous drug abusers (Thuny et al., 2012). Treatment of infective endocarditis usually requires a multidisciplinary approach involving specialists in infectious disease, cardiologists and cardiac surgeons. Current treatment regimes consist of aggressive prolonged antibiotic therapy, frequently combined with surgery (Prendergast and Tornos, 2010, Wilson et al., 2007). Prolonged antibiotic use is often less than successful as 40% of patients relapse within 2 months of finishing clinically effective therapy.
LLL Reduction Achieves the Receive Diversity in MIMO Decoding
Creators: name: Taherzadeh, Mahmoud
name: Mobasher, Amin
name: Khandani, Amir K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Diversity order is an important measure for the performance of communication systems over MIMO fading channels. In this paper, we prove that in MIMO multiple access systems (or MIMO point-to-point systems with V-BLAST transmission), lattice-reduction-aided decoding achieves the maximum receive diversity (which is equal to the number of receive antennas). Also, we prove that the naive lattice decoding (which discards the out-of-region decoded points) achieves the maximum diversity.
description: Submitted to IEEE Trans. on Info. Theory (Jan. 15, 2006), Revised (Mar. 5, 2007)
Bose-Einstein condensation in a mm-scale Ioffe-Pritchard trap
Creators: name: Moore, Kevin L.
name: Purdy, Thomas P.
name: Murch, Kater W.
name: Brown, Kenneth R.
name: Dani, Keshav
name: Gupta, Subhadeep
name: Stamper-Kurn, Dan M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We have constructed a mm-scale Ioffe-Pritchard trap capable of providing axial field curvature of 7800 G/cm$^2$ with only 10.5 Amperes of driving current. Our novel fabrication method involving electromagnetic coils formed of hard anodized aluminum strips is compatible with ultra-high vacuum conditions, as demonstrated by our using the trap to produce Bose-Einstein condensates of 10$^6$ $^87$Rb atoms. The strong axial curvature gives access to a number of experimentally interesting configurations such as tightly confining prolate, nearly isotropic, and oblate spheroidal traps, as well as traps with variable tilt angles with respect to the nominal axial direction.
description: 7 pages, 6 figures
Scalar Fields Nonminimally Coupled to pp Waves
Creators: name: Ayón-Beato, Eloy
name: Hassaïne, Mokhtar
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Here, we report pp waves configurations of three-dimensional gravity for which a scalar field nonminimally coupled to them acts as a source. In absence of self-interaction the solutions are gravitational plane waves with a profile fixed in terms of the scalar wave. In the self-interacting case, only power-law potentials parameterized by the nonminimal coupling constant are allowed by the field equations. In contrast with the free case the self-interacting scalar field does not behave like a wave since it depends only on the wave-front coordinate. We address the same problem when gravitation is governed by topologically massive gravity and the source is a free scalar field. From the pp waves derived in this case, we obtain at the zero topological mass limit, new pp wave solutions of conformal gravity for any arbitrary value of the nonminimal coupling parameter. Finally, we extend these solutions to the self-interacting case of conformal gravity.
description: 14 pages, RevTeX. Minor changes. To appear in Phys. Rev. D
Formation and dissociation reactions of complexes involving interstitial carbon and oxygen defects in silicon
Creators: name: Ayedh, H. M.
name: Monakhov, E. V.
name: Coutinho, J.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present a detailed first-principles study which explores the configurational space along the relevant reactions and migration paths involving the formation and dissociation of interstitial carbon-oxygen complexes, $\mathrm{C_{i}O_{i}}$ and $\mathrm{C_{i}O_{2i}}$, in silicon. The formation/dissociation mechanisms of $\mathrm{C_{i}O_{i}}$ and $\mathrm{C_{i}O_{2i}}$ are found as occurring via capture/emission of mobile $\mathrm{C_{i}}$ impurities by/from O-complexes anchored to the lattice. The lowest activation energies for dissociation of $\mathrm{C_{i}O_{i}}$ and $\mathrm{C_{i}O_{2i}}$ into smaller moieties are 2.3 eV and 3.1 eV, respectively. The first is compatible with the observed annealing temperature of $\mathrm{C_{i}O_{i}}$ , which occurs at around 400 $^{\circ}$C, and below the threshold for $\mathrm{O_{i}}$ diffusion. The latter exceeds significantly the measured activation energy for the annealing of $\mathrm{C_{i}O_{2i}}$ ($E_{\mathrm{a}}=2.55$ eV). We propose that instead of dissociation, the actual annealing mechanism involves the capture of interstitial oxygen by $\mathrm{C_{i}O_{2i}}$, thus being governed by the migration barrier of $\mathrm{O_{i}}$ ($E_{\mathrm{m}}=2.53$ eV). The study is also accompanied by measurements of hole capture cross sections and capture barriers of $\mathrm{C_{i}O_{i}}$ and $\mathrm{C_{i}O_{2i}}$. In combination with previously reported data, we find thermodynamic donor transitions which are directly comparable to the first-principles results. The two levels exhibit close features, conforming to a model where the electronic character of $\mathrm{C_{i}O_{2i}}$ can be described by that of $\mathrm{C_{i}O_{i}}$ perturbed by a nearby O atom.
On the distribution of coefficients of half-integral weight modular forms and the Bruinier-Kohnen Conjecture
Creators: name: Inam, Ilker
name: Özkaya, Zeynep Demirkol
name: Tercan, Elif
name: Wiese, Gabor
Publisher: name: arXiv
Year: 2020
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11F30 (primary), 11F37, 11F25

description: This work represents a systematic computational study of the distribution of the Fourier coefficients of cuspidal Hecke eigenforms of level $Γ_0(4)$ and half-integral weights. Based on substantial calculations, the question is raised whether the distribution of normalised Fourier coefficients with bounded indices can be approximated by a generalised Gaussian distribution. Moreover, it is argued that the apparent symmetry around zero of the data lends strong evidence to the Bruinier-Kohnen Conjecture on the equidistribution of signs and even suggests the strengthening that signs and absolute values are distributed independently.
description: v3: minor revision, might differ slightly from the published version
Neutron star properties and the equation of state of neutron-rich matter
Creators: name: Krastev, Plamen G.
name: Sammarruca, Francesca
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We calculate total masses and radii of neutron stars (NS) for pure neutron matter and nuclear matter in beta-equilibrium. We apply a relativistic nuclear matter equation of state (EOS) derived from Dirac-Brueckner-Hartree-Fock (DBHF) calculations. We use realistic nucleon-nucleon (NN) interactions defined in the framework of the meson exchange potential models. Our results are compared with other theoretical predictions and recent observational data. Suggestions for further study are discussed.
description: 13 pages, 9 figures, 1 table; Revised version, accepted for publication in Physical Review C
Pedagogía crítica en educación física: el uso de la clase invertida en materia anti-dopaje
Creators: name: Salvador-Garcia, Celina
name: Chiva-Bartoll, Oscar
Publisher: name: Zenodo
Year: 2020
Subjects: critical pedagogy, anti-dping education, Flipped Class

description: En el presente capítulo los autores apostan por la flipped classroom (FC) como planteamiento pedagógico activo y globalizador que sirva de vehículo para el aprendizaje y comprensión de un tema tan delicado como es el dopaje en la formación de los profesionales del ámbito de la educación física, la salud y el deporte. En primer lugar, este texto presentará algunos de los aspectos clave que caracterizan la idea de dopaje y cuyo conocimiento re-sulta imperativo para su óptima enseñanza. Seguidamente describiremos los elementos esenciales del enfoque flipped classroom, abordaremos sus particularidades y ofreceremos diversas pautas para su implementación. Por último, presentaremos una serie de razones pedagógicas de calado que sustentan y justifican la propuesta realizada.
THE 2002 US FARM BILL AND INTERNATIONAL AGRI-FOOD TRADE: DUSTING OFF THE PREBISCH THESIS; SPECIAL REPORT
Creators: name: Mussell, Al
name: Mayer, Holly
name: Martin, Larry J.
name: Mussell, Al
name: Mayer, Holly
name: Martin, Larry J.
Publisher: name: Unknown
Year: 2002
Subjects: Agricultural and Food Policy

description: Recent developments in American agricultural and trade policy suggest that the US is backing away from its position as a staunch supporter of freer trade. In the long run, this action will weaken the competitive position of US agriculture and the other protected sectors of the US economy, as was the case when the US did this in the 1920's. It will also clearly harm US trading partners, such as Canada. We'll discuss the direct impacts of the Farm Bill on Canada in another, forthcoming special report. However, for our purposes in this report, the more immediate impact is to deter developing countries from pursuing freer trade as a means of increasing economic growth and improving standards of living. Support for freer trade from developing countries is essential if the current round of WTO is to achieve meaningful gains in trade liberalization. In turn, trade liberalization is absolutely required if low cost/resource rich countries such as the US and Canada are to have prosperous agri-food sectors. Current US policy initiatives give developing countries every incentive to retreat from liberalized trade to highly protectionist policies, just as outlined by Raoul Prebisch nearly 40 years ago. The impact of current US agricultural policy initiatives is to weaken the Doha agenda by forcing developing countries to unilaterally liberalize trade without any significant concessions from the US. This places developing countries in a very difficult position, and dramatically reduces the prospects for future gains through freer trade. In this special report, we outline the following issues that will impact the world agri-food trade context in the coming years: * International trade in primary commodities from the developing country perspective * The US Farm Bill and recent US trade policy initiatives * The agenda for the Doha Round of WTO * Impact of US policy initiatives on the success of WTO
How social workers link their family of origin experience to their social work practice
Creators: name: Atkinson, Louanna
Publisher: name: University of British Columbia
Year: 2009

description: Over the past decade, previous research has reported that most social workers come from dysfunctional families of origin - and propose that such family of origin experiences may affect the mental health and professional abilities of social workers. This qualitative study was designed to explore how social workers make sense of the link between their family of origin experience and their social work practice. Purposive sampling was used to recruit four social workers that had completed (at least) a BSW degree. Each participated in semistructured, personal interviews, lasting approximately ninety minutes. The interviews were audiotaped, transcribed verbatim, and returned to participants for editing and clarification. Narrative and phenomenologicai research methods were used to gain a deeper understanding of the contextualised experiences offered by the social work participants. Implications for social work education, social work practice, and professional responsibility are examined.
TAKING THE BULL BY THE HORNS: REINVENTING THE CANADIAN AGRI-FOOD SECTOR FOR THE 21ST CENTURY; INSTALLMENTS I-V
Creators: name: Martin, Larry J.
name: Martin, Larry J.
Publisher: name: Unknown
Year: 1995
Subjects: Agribusiness

description: The Centre's involvement in the Agri-Food Competitiveness Council and related work on competitiveness has exposed us to a multitude of issues and ideas about how to improve competitiveness. With the completion of GATT and NAFTA, a new policy environment is unfolding. To acknowledge it, we want to lay out some lessons we have learned that may help the sector become all it can in the future. Our objective is to define things which farms, firms and government can do to achieve competitiveness. We will do it in instalments over the next few newsletters. We begin in this issue by describing the principles we believe are important for organizations to follow in being successful, and by describing our vision for the agri-food sector of the future. In later issues we address the three factors which will be of particular importance in shaping the sector's future: international trade policy; domestic and international market segmentation; and process technology. We then complete our basic framework with a SWOT analysis of the sector; i.e. its strengths, weaknesses, opportunities, and threats. Finally, we identify the structural and policy changes needed to take advantage of our opportunities and strengths, while minimizing the effects of our weaknesses and threats in order to achieve the vision.
Spin dependent transport in organic light-emitting diodes
Creators: name: Silva, G. B.
name: Graeff, C. F. O.
name: Nuesch, F.
name: Zuppiroli, L.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Electrically Detected Magnetic Resonance (EDMR) was used to study a series of multilayer organic devices based on aluminum (III) 8-hydroxyquinoline. These devices were designed to identify the micoscopic origin of different spin dependent process, i.e. hopping and exciton formation. EDMR is demonstrated to probe molecular orbitals of charge, and thus indirectly explore interfaces, exciton formation, charge accumalation and electric fields in operating organic based devices.