cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A hydrogeological and geochemical study of the origin and nature of the prairie flats uranium deposit, Summerland, BC
Creators: name: Rossel, Kathy
Publisher: name: University of British Columbia
Year: 2009

description: An investigation of the hydrogeology and groundwater geochemistry was carried out at the Prairie Flats surficial uranium deposit in Summerland, B.C. The deposit contains an estimated 230 tonnes of uranium, most of which is concentrated in the upper half-metre of soil. It is believed to have formed out of the discharge of uraniferous groundwaters into organic-rich sediments over a period of 10,000 years. Objectives of this study were 1) to trace the origins of the groundwaters transporting uranium into the site, 2) to measure current rates of groundwater discharge and uranium deposition, 3) to identify the mechanism(s) of uranium retention, such as adsorption, reductive precipitation or evaporative precipitation, and 4) to comment on" the likelihood of uranium remobilization. A literature review was first carried out to characterize the area's local and regional groundwater systems. Next, a network of 13 piezometers was installed across the site, with completion depths ranging from 1 to 3 metres. Using these, hydraulic conductivities of the hydrostratigraphic units were measured, and relative head values were monitored at four different times of year. Groundwater and surface waters were tested for pH, Eh, conductivity, and concentrations of U, Ca, Mg, Na, K, N03, HC03, S04, and Cl. Measurements of groundwater discharge into Prairie Creek, which crosses the site, were also carried out. Results show that the flats are a discharge zone for locally recharged groundwaters, that is groundwaters that infiltrate within a few kilometers of the site and travel at depths of less than 100m within glacial deposits and shallow bedrock. These groundwaters are neutral in pH, relatively oxidizing, and enriched in calcium and bicarbonate. Discharge rates are on the order of 9450 m³/year, most of which flows vertically upward from below the deposit. As uranium concentrations in the incoming groundwaters are up to 100μg/L, current uranium deposition rates are estimated to be around 1 kg/year. This is at least ten times lower than that calculated using the estimated size and age of the deposit, which suggests that uranium deposition rates were higher in the past than they are today. A major fraction of the uranium is held by adsorption to organics, however desorption by the formation of soluble complexes with bicarbonate is also evident. Two field observations show that soil aeration.or exposure to septic discharge may also remobilize uranium. Uranium which is not held by adsorption is precipitated as a reduced uranium mineral, probably UO₂[sub (C)]. Relatively more reducing conditions near ground surface than at depth may help to explain the high concentrations of uranium within the top half-metre of soil.
Oscillatory regime in the Multidimensional Homogeneous Cosmological Models Induced by a Vector Field
Creators: name: Benini, R.
name: Kirillov, A. A.
name: Montani, G.
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We show that in multidimensional gravity vector fields completely determine the structure and properties of singularity. It turns out that in the presence of a vector field the oscillatory regime exists in all spatial dimensions and for all homogeneous models. By analyzing the Hamiltonian equations we derive the Poincaré return map associated to the Kasner indexes and fix the rules according to which the Kasner vectors rotate. In correspondence to a 4-dimensional space time, the oscillatory regime here constructed overlap the usual Belinski-Khalatnikov-Liftshitz one.
description: 9 pages, published on Classical and Quantum Gravity
The Death of Metipa (II)
Creators: name: Ochurte, Rufino
name: Mixco, Mauricio J.
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: klb

description: See Kiliwa Texts: "When I have Donned My Crest of Stars" (University of Utah Press, 1983), p. 119 for transcription, segmentation, glossing, and translation of this story.
Precision physics with inclusive QCD processes
Creators: name: Pich, Antonio
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The inclusive production of hadrons through electroweak currents can be rigorously analysed with short-distance theoretical tools. The associated observables are insensitive to the involved infrared behaviour of the strong interaction, allowing for very precise tests of Quantum Chromodynamics. The theoretical predictions for $σ(e^+e^-\to\mathrm{hadrons})$ and the hadronic decay widths of the $τ$ lepton and the $Z$, $W$ and Higgs bosons have reached an impressive accuracy of $\mathcal{O}(α_s^4)$. Precise experimental measurements of the $Z$ and $τ$ hadronic widths have made possible the accurate determination of the strong coupling at two very different energy scales, providing a highly significant experimental verification of asymptotic freedom. A detailed discussion of the theoretical description of these processes and their current phenomenological status is presented. The most precise determinations of $α_s$ from other sources are also briefly reviewed and compared with the fully-inclusive results.
description: 50 pages, 18 figures. References added. Version published in Progress in Particle and Nuclear Physics
Quantum Probability's Algebraic Origin
Creators: name: Niestegge, Gerd
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Max Born's statistical interpretation made probabilities play a major role in quantum theory. Here we show that these quantum probabilities and the classical probabilities have very different origins. While the latter always result from an assumed probability measure, the first include transition probabilities with a purely algebraic origin. Moreover, the general definition of transition probability introduced here comprises not only the well-known quantum mechanical transition probabilities between pure states or wave functions, but further physically meaningful and experimentally verifiable novel cases. A transition probability that differs from 0 and 1 manifests the typical quantum indeterminacy in a similar way as Heisenberg's and others' uncertainty relations and, furthermore, rules out deterministic states in the same way as the Bell-Kochen-Specker theorem. However, the transition probability defined here achieves a lot more beyond that: it demonstrates that the algebraic structure of the Hilbert space quantum logic dictates the precise values of certain probabilities and it provides an unexpected access to these quantum probabilities that does not rely on states or wave functions.
Gopakumar-Vafa Hierarchies in Winding Inflation and Uplifts
Creators: name: Carta, Federico
name: Mininno, Alessandro
name: Righi, Nicole
name: Westphal, Alexander
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We propose a combined mechanism to realize both winding inflation and de Sitter uplifts. We realize the necessary structure of competing terms in the scalar potential not via tuning the vacuum expectation values of the complex structure moduli, but by a hierarchy of the Gopakumar-Vafa invariants of the underlying Calabi-Yau threefold. To show that Calabi-Yau threefolds with the prescribed hierarchy actually exist, we explicitly create a database of all the genus $0$ Gopakumar-Vafa invariants up to total degree $10$ for all the complete intersection Calabi-Yau's up to Picard number $9$. As a side product, we also identify all the redundancies present in the CICY list, up to Picard number $13$. Both databases can be accessed at this link: https://www.desy.de/~westphal/GV_CICY_webpage/GVInvariants.html .
description: v2, JHEP accepted, added references, 1+44 pages, 5 figures, 3 appendices
Electromagnetic coupling in frequency domain induced polarisation data
Creators: name: Routh, Partha Sarathi
Publisher: name: University of British Columbia
Year: 2009

description: Frequency domain induced polarization (IP) surveys are commonly carried out to provide information about the chargeability structure of the earth. The goals might be as diverse as trying to delineate a mineralized and/or alteration zone for mineral exploration, or to find a region of contaminants for an environmental problem. Unfortunately, the measured responses can have contributions from inductive and galvanic effects of the ground. The inductive components are called EM coupling effects. They are considered to be "noise" and much of this thesis is devoted towards either removing these effects, or reformulating the inverse problem so that inductive effects are part of the "signal". If the forward modeling is based on galvanic responses only, then the inductive responses must first be removed from the data. The motivation for attacking the problem in this manner is that it is easier to solve D.C. resistivity equation than the full Maxwell's equation. The separation of the inductive response from the total response is derived by expressing the total electric field as a product of an IP response function, and an electric field which depends on EM coupling response. This enables me to generate formulae to obtain IP amplitude (PFE) and phase response from the raw data. The data can then be inverted, using a galvanic forward modeling. I illustrate this with 1D and 3D synthetic examples. To handle field data sets, I have developed an approximate method for estimating the EM coupling effects based upon the assumption that the earth is locally 1D. The 1D conductivity is obtained from a 2D inversion of the low frequency DC resistivity data. Application of this method to a field data set has shown encouraging results. I also examine the EM coupling problem in terms of complex conductivity. I show that if the forward modeling is carried out with full Maxwell's equation, then there is no need to remove EM coupling. I illustrate this with 1D synthetic example. In summary, I have investigated the EM coupling problem in IP and developed a practical removal methodology that can be applied to data sets from 1D, 2D and 3D earth structures.
Transmission sanguine de paludisme : évaluation des pratiques associées au rinçage pulsé des cathéters veineux périphériques
Creators: name: Gaudichon, Agnès
name: Nourry, Christèle
name: Élise Seringe
name: Astagneau, Pascal
Publisher: name: Health & Co
Year: 2024
Subjects: Transmission croisée
Cathéter périphérique
Bonnes pratiques cliniques

description: Introduction. En Île-de-France (IDF), trois cas de paludisme nosocomial ont été signalés en 2021 pour lesquels l’hypothèse d’une transmission sanguine liée à de mauvaises pratiques lors du rinçage du cathéter veineux périphérique (CVP) a été formulée. L’objectif était d’explorer ces pratiques et d’alerter les équipes sur ces événements. Matériel et méthode. Un questionnaire en ligne a été adressé aux équipes opérationnelles d’hygiène (EOH) des établissements de santé (ES) d’IDF et à tous les CPias. Le recueil de données concernait la mise en place des recommandations de la Société française d’hygiène hospitalière (SF2H) de 2019, les pratiques de rinçage pulsé ainsi que des commentaires libres. Résultats. Au total, 136 EOH ont participé dans 11 régions différentes. Le rinçage pulsé des CVP était recommandé dans 75% des ES. La moitié d’entre eux l’avait mis en place après 2019 mais sans accompagner systématiquement ce changement. Le surcoût, les contre-indications ou le manque de temps ont été évoqués par ceux ne suivant pas encore ces recommandations. Les cinq indications de rinçage proposées par la SF2H étaient majoritairement suivies par les EOH et les professionnels. Des seringues préremplies ou préparées extemporanément étaient principalement utilisées. La préparation se faisait surtout à partir d’unidoses mais, dans 45% des ES, le matériel utilisé (poche ou unidose) était susceptible d’être conservé pour plusieurs patients. La traçabilité du rinçage n’était pas réalisée dans 92% des ES. Conclusion. Le partage de flacon multidose ou la réutilisation de seringue préremplie sont des pratiques à risque de transmission sanguine. Ces écarts ont pu être favorisés par la pandémie de Covid-19 et les modifications récentes des pratiques. Les EOH doivent être sensibilisées à ce risque et renforcer la formation des soignants.
Redshift space 21 cm power spectra from reionization
Creators: name: Wang, Xiaomin
name: Hu, Wayne
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We construct a simple but self-consistent analytic ionization model for rapid exploration of 21cm power spectrum observables in redshift space. It is fully described by the average ionization fraction $x_e(z)$ and HII patch size $R(z)$ and has the flexibility to accommodate various reionization scenarios. The model associates ionization regions with dark matter halos of the number density required to recover $x_e$ and treats redshift space distortions self-consistently with the virial velocity of such halos. Based on this model, we study the line-of-sight structures in the brightness fluctuations since they are the most immune to foreground contamination. We explore the degeneracy between the HII patch size and nonlinear redshift space distortion in the one dimensional power spectrum. We also discuss the limitations experimental frequency and angular resolutions place on their distinguishability. Angular resolution dilutes even the radial signal and will be a serious limitation for resolving small bubbles before the end of reionization. Nonlinear redshift space distortions suggest that a resolution of order 1 -- 10\arcsec and a frequency resolution of 10kHz will ultimately be desirable to extract the full information in the radial field at $z\sim 10$. First generation instruments such as LOFAR and MWA can potentially measure radial HII patches of a few comoving Mpc and larger at the end of reionization and are unlikely to be affected by nonlinear redshift space distortions.
description: 13 pages, 10 figures. Revised version. Includes minor changes. Adds appendix on accomodating a distribution of radii for the HII regions. Accepted for publication in ApJ
Mountain Sheep Constellation (II)
Creators: name: Ochurte, Rufino
name: Mixco, Mauricio J.
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: klb

description: See Kiliwa Texts: "When I have Donned My Crest of Stars" (University of Utah Press, 1983), p. 106 for transcription, segmentation, glossing, and translation of this story.
About the exotic structure of $Z_{cs}$
Creators: name: Wan, Bing-Dong
name: Qiao, Cong-Feng
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Very recently a new hadronic structure around $3.98$ GeV was observed in BESIII experiment. From its decay modes, it is reasonable for people to assign it to the category of exotic state, say $Z^+_{cs}$, the stranged-parter of $Z_{c}(3900)$. This finding indicates for the first time the exotic state with strange quark in charm sector, and hence has a peculiar importance. By virtue of the QCD Sum Rule technique, we analyze the $Z^+_{cs}$ about its possible configuration and physical properties, and find it could be configured as a mixture of two types of structures, $[1_c]_{\bar{c} u}\otimes[1_c]_{\bar{s} c}$ and $[1_c]_{\bar{c} c}\otimes[1_c]_{\bar{s} u}$, or $[3_c]_{\bar{c} u}\otimes[\bar{3}_c]_{\bar{s} c}$ and $[3_c]_{\bar{c} c}\otimes[\bar{3}_c]_{\bar{s} u}$, with $J^P=1^+$. Physically, it then appears to be the emergence of a compound of four possible currents in each configuration, which tells the single current evaluation of hadron spectroscopy and their decay properties are sometimes not enough. We find in both cases the energy spectra may fit well with the experimental observation, i.e. $3.98$ GeV, within the uncertainties, while noted the former is not favored by vector meson exchange model. Various $Z^+_{cs}(3980)$ decay modes are evaluated, which are critical for pinning down its configuration and left for experimental verification. We also predict the mass of $Z^0_{cs}$, the neutral partner of $Z^+_{cs}(3980)$, and analyze its dominant decay probabilities.
description: 31 pages, 4 figures, a few expressions are amended
Collapse and revivals of a the photon field in a many-body Landau-Zener process
Creators: name: Keeling, J.
name: Gurarie, V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We consider the evolution of a two-level system coupled to a photon field initially in a coherent state, as the energy of the two-level system is linearly varied through resonance with the photon field. At a fixed time after the resonance, the amplitude of the photon field is found to show a collapse and subsequent revivals as a function of rate of energy variation. Including decay of the photon field, we find that the observation of such collapse and revivals is near the technological limit of current cavity QED experiments but should be achievable.
description: Some clarifications, added inset to Fig. 2. 4 pages, 3 figures
Enhanced magnetocaloric effect and magnetic phase diagrams of single-crystal GdCrO$_3$
Creators: name: Zhu, Yinghao
name: Zhou, Pengfei
name: Li, Tao
name: Xia, Junchao
name: Wu, Si
name: Fu, Ying
name: Sun, Kaitong
name: Zhao, Qian
name: Li, Zhen
name: Tang, Zikang
name: Xiao, Yinguo
name: Chen, Zhenqiang
name: Li, Hai-Feng
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: The crystalline structure, magnetism, and magnetocaloric effect of a GdCrO$_3$ single crystal grown with the laser-diode-heated floating-zone technique have been studied. The GdCrO$_3$ single crystal crystallizes into an orthorhombic structure with the space group $Pmnb$ at room temperature. Upon cooling, under a magnetic field of 0.1 T, it undergoes a magnetic phase transition at $T_{\textrm{N-Cr}} =$ 169.28(2) K with Cr$^{3+}$ ions forming a canted antiferromagnetic (AFM) structure, accompanied by a weak ferromagnetism. Subsequently, a spin reorientation takes place at $T_{\textrm{SR}} =$ 5.18(2) K due to Gd$^{3+}$-Cr$^{3+}$ magnetic couplings. Finally, the long-range AFM order of Gd$^{3+}$ ions establishes at $T_{\textrm{N-Gd}} =$ 2.10(2) K. Taking into account the temperature-(in)dependent components of Cr$^{3+}$ moments, we obtained an ideal model for describing the paramagnetic behavior of Gd$^{3+}$ ions within 30--140 K. We observed a magnetic reversal (positive $\rightarrow$ negative $\rightarrow$ positive) at 50 Oe with a minimum centering around 162 K. In the studied temperature range of 1.8-300 K, there exists a strong competition between magnetic susceptibilities of Gd$^{3+}$ and Cr$^{3+}$ ions, leading to puzzling magnetic phenomena. We have built the magnetic-field-dependent phase diagrams of $T_{\textrm{N-Gd}}$, $T_{\textrm{SR}}$, and $T_{\textrm{N-Cr}}$, shedding light on the nature of the intriguing magnetism. Moreover, we calculated the magnetic entropy change and obtained a maximum value at 6 K and $Δμ_0H$ = 14 T, i.e., -$ΔS_{\textrm{M}} \approx$ 57.5 J/kg K. Among all RCrO$_3$ (R = $4f^n$ rare earths, $n =$ 7-14) compounds, the single-crystal GdCrO$_3$ compound exhibits the highest magnetic entropy change, as well as an enhanced adiabatic temperature, creating a prominent magnetocaloric effect for potential application in magnetic refrigeration.
description: 11 pages, 5 figures
One-step implementation of Toffoli gate for neutral atoms based on unconventional Rydberg pumping
Creators: name: Yin, H. D.
name: Li, X. X.
name: Wang, G. C.
name: Shao, X. Q.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Compared with the idea of universal quantum computation, a direct synthesis of a multiqubit logic gate can greatly improve the efficiency of quantum information processing tasks. Here we propose an efficient scheme to implement a three-qubit controlled-not (Toffoli) gate of neutral atoms based on unconventional Rydberg pumping. By adjusting the strengths of Rabi frequencies of driving fields, the Toffoli gate can be achieved within one step, which is also insensitive to the fluctuation of the Rydberg-Rydberg interaction. Considering different atom alignments, we can obtain a high-fidelity Toffoli gate at the same operation time $\sim 7~μs$. In addition, our scheme can be further extended to the four-qubit case without altering the operating time.
description: To be published in Optics Express
Bericht von der Mitgliederversammlung 1988 der Europäischen Arbeitsgemeinschaft Kirche und Arbeitswelt
Creators: name: Springe, Christa
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 38 Nr. 2 (1989): Ökumenische Rundschau, Band 38, Heft 2
title: Σύγχρονες εξελίξεις στον τομέα της κυματικής ενέργειας
title: Recent prospects of wave energy
titleType: AlternativeTitle
Creators: name: Λυγνός, Ευάγγελος
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2023
Subjects: Ανανεώσιμες πηγές ενέργειας
Κυματική ενέργεια
Μετατροπείς ενέργειας

description: Σκοπός της παρούσας διπλωματικής εργασίας είναι η ανάλυση των διαφόρων μεθόδων και τεχνολογιών για την αξιοποίηση της ενέργειας από την ωκεάνια έκταση. Το Κεφάλαιο 1 θα υπογραμμίσει τη σημασία της κυματικής ενέργειας, διευκρινίζοντας τις μορφές της και τα ζωτικής σημασίας δεδομένα για το κυματικό κλίμα, ιδίως στην Ευρώπη και την Ελλάδα. Το Κεφάλαιο 2 θα διευρύνει τον ορίζοντα για να συμπεριλάβει την παλιρροιακή ενέργεια, την ενέργεια από θαλάσσια ρεύματα και την εκμετάλλευση της θερμότητας των ωκεανών. Το Κεφάλαιο 3 θα εστιάσει στους λειτουργικούς μετατροπείς κυματικής ενέργειας, αναδεικνύοντας τους μηχανισμούς και τις επιπτώσεις τους σε σενάρια πραγματικού κόσμου. Τέλος, το Κεφάλαιο 4 θα εμβαθύνει στις θεμελιώδεις αρχές της κυματικής ενέργειας και στις μεθοδολογίες αξιολόγησης του δυναμικού της. Με την περιήγηση σε αυτά τα κεφάλαια, οι αναγνώστες θα αποκτήσουν μια ολοκληρωμένη κατανόηση των καινοτόμων τεχνολογιών και στρατηγικών που διαμορφώνουν το πεδίο της ωκεάνιας ενέργειας.
Controllable Optical Resonances and Unidirectional Scattering by Core-shell Nanoparticles
Creators: name: Dong, Yiwei
name: Yang, Yuanqing
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Nanoparticles supporting a distinct series of Mie resonances have enabled a new class of nanoantennas and provide efficient ways to manipulate light at the nanoscale. The ability to flexibly tune the optical resonances and scattering directionality are particularly essential for various applications ranging from biosensing to nanolasers. In this paper, we investigate the core-shell nanoparticles that support both electric and magnetic Mie resonances and for the first time systematically reveal the mode evolution from a pure high-index dielectric nanosphere to a pure plasmonic one, where it has a sudden transition when core-shell ratio increases from 0.4 to 0.5. Furthermore, by engineering the electric and magnetic resonances, we demonstrate the unidirectional forward and backward scattering in such a system and reveal its tunability via geometric tuning.
Optimal Condition for the Free Cyanide Determination in Cassava (Manihot esculenta Crantz)
Creators: name: Suchirat Sakuanrungsirikul
Publisher: name: Department of Agriculture
Year: 2007
Subjects: cassava
cyanogenic glucoside
free cyanide
enzymatic method

description: Thai Agricultural Research Journal, 25, 2, 157-165
On the analytic spread and the reduction number of the ideal of maximal minors
Creators: name: Miyazaki, Mitsuhiro
Publisher: name: arXiv
Year: 2005
Subjects: subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: 13F50; 13A30; 13C40

description: Let $m$, $n$, $a_1$, ..., $a_r$, $b_1$, ..., $b_r$ be integers with $1\leq a_1
New method for calculating electromagnetic effects in semileptonic beta-decays of mesons
Creators: name: Seng, Chien-Yeah
name: Feng, Xu
name: Gorchtein, Mikhail
name: Jin, Lu-Chang
name: Meißner, Ulf-G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We construct several classes of hadronic matrix elements and relate them to the low-energy constants in Chiral Perturbation Theory that describe the electromagnetic effects in the semileptonic beta decay of the pion and the kaon. We propose to calculate them using lattice QCD, and argue that such a calculation will make an immediate impact to a number of interesting topics at the precision frontier, including the outstanding anomalies in $|V_{us}|$ and the top-row Cabibbo-Kobayashi-Maskawa matrix unitarity.
description: Version to appear in JHEP
Chandra observations of the millisecond X-ray pulsar IGR J00291+5934 in quiescence
Creators: name: Jonker, P. G.
name: Campana, S.
name: Steeghs, D.
name: Torres, M. A. P.
name: Galloway, D. K.
name: Markwardt, C. B.
name: Chakrabarty, D.
name: Swank, J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this Paper we report on our analysis of three Chandra observations of the accretion-powered millisecond X-ray pulsar IGR J00291+5934 obtained during the late stages of the 2004 outburst. We also report the serendipitous detection of the source in quiescence by ROSAT during MJD 48830-48839. The detected 0.3-10 keV source count rates varied significantly between the Chandra observations from (7.2+-1.2)x10^-3, (6.8+-0.9)x10^-3, and (1.4+-0.1)x10^-2 counts per second for the 1st, 2nd, and 3rd Chandra observation, on MJD 53371.88, 53383.99, and 53407.57, respectively. The count rate for the 3rd observation is 2.0+-0.4 times as high as that of the average of the first two observations. The unabsorbed 0.5-10 keV source flux for the best-fit power-law model to the source spectrum was (7.9+-2.5)x10^-14, (7.3+-2.0)x10^-14, and (1.17+-0.22)x10^-13 erg cm^-2 s^-1 for the 1st, 2nd, and 3rd Chandra observation, respectively. We find that this source flux is consistent with that found by ROSAT [~(5.4+-2.4)x10^-14 erg cm^-2 s^-1]. Under the assumption that the interstellar extinction, N_H, does not vary between the observations, we find that the blackbody temperature during the 2nd Chandra observation is significantly higher than that during the 1st and 3rd observation. Furthermore, the effective temperature of the neutron star derived from fitting an absorbed blackbody or neutron star atmosphere model to the data is rather high in comparison with many other neutron star soft X-ray transients in quiescence, even during the 1st and 3rd observation. If we assume that the source quiescent luminosity is similar to that measured for two other accretion powered millisecond pulsars in quiescence, the distance to IGR J00291+5934 is 2.6-3.6 kpc.
description: 7 pages, 3 Figures, accepted for publication in MNRAS
The periodic variations of a white-light flare observed with ULTRACAM
Creators: name: Mathioudakis, M.
name: Bloomfield, D. S.
name: Jess, D. B.
name: Dhillon, V. S.
name: Marsh, T. R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: High time resolution observations of a white--light flare on the active star EQ PegB show evidence of intensity variations with a period of approximately 10 s. The period drifts to longer values during the decay phase of the flare. If the oscillation is interpreted as an impulsively--excited, standing--acoustic wave in a flare loop, the period implies a loop length of 1.7 Mm and 3.4 Mm for the case of the fundamental mode and the second harmonic, respectively. However, the small loop lengths imply a very high modulation depth making the acoustic interpretation unlikely. A more realistic interpretation may be that of a fast--MHD wave, with the modulation of the emission being due to the magnetic field. Alternatively, the variations could be due to a series of reconnection events. The periodic signature may then arise as a result of the lateral separation of individual flare loops or current sheets with oscillatory dynamics (i.e. periodic reconnection).
description: 10 pages, 3 figures, accepted for Astronomy Astrophysics
Inversion of em data to recover 1-d conductivity and geometric survey parameter
Creators: name: Walker, Sean Eugene
Publisher: name: University of British Columbia
Year: 2009

description: The presence of geometrical survey parameter errors can cause problems when attempting to invert electromagnetic (EM) data. There are two types of data which are of particular interest: airborne EM (AEM) and ground based horizontal loop EM (HLEM). When dealing with AEM data there is a potential for errors in the measurement height. The presence of measurement height errors can result in distortions in the conductivity models recovered via inversion. When dealing with HLEM there is a potential for errors in the coil separation. This can cause the inphase component of the data to be distorted. Distortions such as these can make it impossible for an inversion algorithm to predict the inphase data. Examples of these types of errors can be found in the Mt. Milhgan and Sullivan data sets. The Mt. Milligan data are contaminated with measurement height errors and the Sullivan data are contaminated with coil separation errors. In order to ameliorate the problems associated with geophysical survey parameter errors a regularized inversion methodology is developed through which it is possible to recover both a function and a parameter. This methodology is applied to the 1-D EM inverse problem in order to recover both 1-D conductivity structure and a geometrical survey parameter. The algorithm is tested on synthetic data and is then applied to the field data sets. Another problem which is commonly encountered when inverting geophysical data is the problem of noise estimation. When solving an inverse problem it is necessary to fit the data to the level of noise present in the data. The common practice is to assign noise estimates to the data a priori. However, it is difficult to estimate noise by observation alone and therefore, the assigned errors may be incorrect. Generalized cross validation is a statistical method which can be used to estimate the noise level of a given data set. A non-linear inversion methodology which utilizes GCV to estimate the noise level within the data is developed. The methodology is applied to 1-D EM inverse problem. The algorithm is tested on synthetic examples in order to recover 1-D conductivity and also to recover 1-D conductivity as well as a geometrical survey parameter. The strengths and limitations of the algorithm are discussed.
Magnetized hypermassive neutron star collapse: a central engine for short gamma-ray bursts
Creators: name: Shibata, Masaru
name: Duez, Matthew D.
name: Liu, Yuk Tung
name: Shapiro, Stuart L.
name: Stephens, Branson C.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A hypermassive neutron star (HMNS) is a possible transient formed after the merger of a neutron star binary. In the latest magnetohydrodynamic simulations in full general relativity, we find that a magnetized HMNS undergoes `delayed' collapse to a rotating black hole (BH) as a result of angular momentum transport via magnetic braking and the magnetorotational instability. The outcome is a BH surrounded by a massive, hot torus with a collimated magnetic field. The torus accretes onto the BH at a quasi-steady accretion rate ~10 solar mass/s; the lifetime of the torus is ~10 ms. The torus has a temperature \sim 10^{12} K, leading to copious neutrino-antineutrino thermal radiation. Therefore, the collapse of an HMNS is a promising scenario for generating short-duration gamma-ray bursts and an accompanying burst of gravitational waves and neutrinos.
description: 4 pages, 2 figures, submitted to Phys. Rev. Letter
Stellungnahme des Präsidiums der Vereinigung Evangelischer Freikirchen zum Christlichen Gemeinschaftsverband Mülheim a.d.Ruhr und der Berliner Erklärung (1909)
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 38 Nr. 2 (1989): Ökumenische Rundschau, Band 38, Heft 2
ABCD of Kondo effect
Creators: name: Kimura, Taro
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We explore the Kondo effect incorporating the localized impurity transforming under generic symmetry group $G$, that we call the $G$-Kondo effect. We derive the one-dimensional effective model coupled with the impurity, and studied the thermodynamic properties based on the boundary conformal field theory approach. We in particular study the impurity entropy at the conformal fixed point, and the low temperature behavior of the specific heat and the susceptibility. We also consider the Wilson ratio based on these results, and mention the case with exceptional group symmetry.
description: 20 pages; minor changes, typos corrected, references added
Stable cosmological models driven by a free quantum scalar field
Creators: name: Dappiaggi, Claudio
name: Fredenhagen, Klaus
name: Pinamonti, Nicola
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In the mathematically rigorous analysis of semiclassical Einstein's equations, the renormalisation of the stress-energy tensor plays a crucial role. We address such a topic in the case of a scalar field with both arbitrary mass and coupling with gravity in the hypothesis that the underlying algebraic quantum state is of Hadamard type. Particularly, if we focus on highly symmetric solutions of the semiclassical Einstein's equations, the envisaged method displays a de Sitter type behaviour even without an a priori introduced cosmological constant. As a further novel result we shall show that these solutions turn out to be stable.
description: 8 pages, 1 figure and revtex. Comments and references added
Treatment of Narrow Medians on Four-Lane Rural Roadways
Creators: name: Pigman, Jerry G.
name: Agent, Kenneth R.
Publisher: name: Kentucky Transportation Center, University of Kentucky
Year: 1986
Subjects: subject: Transportation Engineering

description: The objective of this study was to investigate alternatives to paved mountable medians that have been used in the past on sections of four-lane, partially controlled access roads where right-of-way is restricted. These mountable medians present obvious operational problems due to the 3-inch difference in height as compared to the through lanes. In addition, construction and maintenance problems are associated with mountable medians because of the height differential.  A telephone survey of 16 states was conducted to determine their policy for separation of rural four-lane roads with partial control of access and narrow medians. Accident analyses comparing roads in Kentucky with and without mountable medians were also performed.  Considering results from the survey and the accident analysis, it was determined that the flush median (rather than a mountable median) was an appropriate application for separation of rural four-lane roads with partial control of access and medians less than 20 feet wide.
Impact Evaluation of the Lexington-Fayette County Traffic Alcohol Program
(1982-1986)
Creators: name: Pigman, Jerry G.
name: Agent, Kenneth R.
Publisher: name: Kentucky Transportation Center, University of Kentucky
Year: 1986
Subjects: subject: Transportation Engineering

description: This report is a final evaluation of four years of increased police enforcement to reduce alcohol-related accidents in Lexington-Fayette County, Kentucky. Three types of data were collected as a means of evaluating the Traffic Alcohol Program; accident data, arrest and adjudication data, and cost-effectiveness data.  Results from before-and-after comparisons and time-series analysis show alcohol-related accidents decreased significantly during the study period. When comparing two years before with four years during the increased enforcement, the reduction in alcohol-related accidents during hours of increased enforcement was 37.3 percent using standard before and after analysis and 36.4 percent using time-series analysis. For all hours of the day, alcohol-related accidents decreased by 30.3 percent. During the same time period, alcohol-related fatal or injury accidents decreased 29.1 percent.  Arrests have averaged 3,220 per year for the four years of increased enforcement as compared to 929 the year before. The DUI conviction rate has remained at approximately 90 percent throughout the program. Based on costs associated with the program (enforcement, jail costs, and court costs) and benefits (reduced accident costs, fines for DUI, and fines for other offenses); the benefit-cost ration was 3.81. If reduced accident costs were eliminated and only direct income was used as benefits, then the benefit-cost ratio would be 1.20.
Screening of the Magnetic Field of Disk Accreting Stars
Creators: name: Lovelace, R. V. E.
name: Romanova, M. M.
name: Bisnovatyi-Kogan, G. S.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: An analytical model is developed for the screening of the external magnetic field of a rotating, axisymmetric neutron star due to the accretion of plasma from a disk. The decrease of the field occurs due to the electric current in the infalling plasma. The deposition of this current carrying plasma on the star's surface creates an induced magnetic moment with a sign opposite to that of the original magnetic dipole. The field decreases independent of whether the star spins-up or spins-down. The time-scale for an appreciable decrease (factor of $>100$) of the field is found to be $\sim 1.6 \times 10^7$ yr, for a mass accretion rate $\dot{M}=10^{-9} M_\odot/$yr and an initial magnetic moment $μ_i = 10^{30}{\rm G cm}^3$ which corresponds to a surface field of $10^{12} $G if the star's radius is $10^6$ cm. The time-scale varies approximately as $μ_i^{3.8}/\dot{M}^{1.9}$. The decrease of the magnetic field does not have a simple relation to the accreted mass. Once the accretion stops the field leaks out on an Ohmic diffusion time scale which is estimated to be $ > 10^9$ yr.
description: 11 pages, 7 figures
I nomi propri e gli uomini medi. Romanzo, scienze umane, democrazia
Creators: name: Mazzoni, Guido
Publisher: name: Università degli Studi di Cagliari
Year: 2015

description: Nel 2008, quando morì mio padre, cercai di raccogliere le foto che avevo di lui, come succede in questi casi, e, come succede in questi casi, allargai la ricerca alle generazioni precedenti. Le immagini che ritraevano il lato paterno della famiglia erano pochissime. Scoprii che nel 1972, durante un trasloco, mio nonno aveva deciso di buttare via una parte delle poche foto che possedeva. Quando mia madre gli chiese perché lo avesse fatto, lui rispose «tutta roba vecchia, tutta gente morta». Nato contadino in condizioni che non differivano molto da quelle di Ancien Régime, cresciuto in un’epoca nella quale la fotografia era un’arte costosa, complicata ed elitaria, mio nonno paterno pensava di non avere i mezzi e prima ancora il diritto di lasciare tracce. Si considerava una persona di fatica; la sua vita avrebbe avuto un senso solo attraverso il grande corpo allargato della famiglia, lavorando per far vivere i figli meglio dei genitori, com’era accaduto alle generazioni immemorabili di mezzadri da cui discendeva; tutto il resto era irrilevante e soprattutto non faceva per lui, a cominciare dalla conservazione della sua immagine nel tempo.
description: Between, Vol 5, N° 10 (2015): L’immaginario politico. Impegno, resistenza, ideologia
Phase Amplification in Spinodal Decomposition of Immiscible Fluids with Interconversion of Species
Creators: name: Shumovskyi, Nikolay A.
name: Longo, Thomas J.
name: Buldyrev, Sergey V.
name: Anisimov, Mikhail A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A fluid composed of two molecular species may undergo phase segregation via spinodal decomposition. However, if the two molecular species can interconvert, e.g. change their chirality, then a phenomenon of phase amplification, which has not been studied so far, emerges. As a result, eventually, one phase will completely eliminate the other one. We model this phenomenon on an Ising system which relaxes to equilibrium through a hybrid of Kawasaki-diffusion and Glauber-interconversion dynamics. By introducing a probability of Glauber-interconversion dynamics, we show that the particle conservation law is broken, thus resulting in phase amplification. We characterize the speed of phase amplification through scaling laws based on the probability of Glauber dynamics, system size, and distance to the critical temperature of demixing.
description: 6 pages, 5 figures
Politica e estetica: la questione irrisolta della critica marxista
Creators: name: Muzzioli, Francesco
Publisher: name: Università degli Studi di Cagliari
Year: 2015

description: Nel momento in cui si torna a parlare di “impegno” e appare giusto porre alla letteratura una domanda “politica”, mi sembra necessario andare a rivedere il dibattito là dove si era fermato...
description: Between, Vol 5, N° 10 (2015): L’immaginario politico. Impegno, resistenza, ideologia
Energy consumption in the glass melting process : Part 1. Theoretical relations
Creators: name: Němec, Lubomír
Publisher: name: Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft
Year: 1995
Subjects: subject: 660

description: Formulae have been proposed expressing the influence of internal melting factors such as temperature, external pressure, glass composition, size distribution of sand and intensity of glass stirring on the specific energy consumption of glass melting, and the appropriate partial derivatives have been given. The possible ways of exploiting the melting reserve have been discussed. Using the mentioned formulae, the results of laboratory experiments and single glass flow models, the energetic trends resulting from the variation of melting conditions may be revealed.
Esoteric Animal Names
Creators: name: Ochurte, Rufino
name: Mixco, Mauricio J.
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: klb

description: See Kiliwa Texts: "When I have Donned My Crest of Stars" (University of Utah Press, 1983), p. 43-44 for transcription, segmentation, glossing, and translation of this story.
Observability of the Higgs Boson in the Presence of Extra Standard Model Families at the Tevatron
Creators: name: Arik, E.
name: Cakir, O.
name: Cetin, S. A.
name: Sultansoy, S.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The observability of the Higgs boson via the WW^* decay channel at the Tevatron is discussed taking into account the enhancements due to the possible existence of the extra standard model (SM) families. It seems that the existence of new SM families can give the Tevatron experiments (D0 and CDF) the opportunity to observe the intermediate mass Higgs boson before the LHC
description: 13 pages, 5 figures, 2 tables
La città senza nome. Eclissi del conflitto e dispositivi di impotenza
Creators: name: Giglioli, Daniele
Publisher: name: Università degli Studi di Cagliari
Year: 2015
Subjects: Literature; Subject; Conflict; Terror; Trauma; Victim; State of Exception

description: Through the analysis of a novel by José Saramago, Essay on lucidity, questioned in the light of the latest perspectives in philosophy and contemporary political theory, this paper aims to pinpoint five dispositifs (Terror, Trauma, Victimization, Symbolic Misery and State of Exception) which shape the widespread sense of political helplessness that pervades today’s society. Such a sense of impotence is here attributed to the eclipse of the concept of conflict through which modernity has thought its own subjectivity as a continuous re-discussion of its hegemonic discourses.
description: Between, Vol 5, N° 10 (2015): L’immaginario politico. Impegno, resistenza, ideologia
Effects of melting conditions on platinum-inclusion content in phosphate laser glasses
Creators: name: Campbell, John H.
name: Wallerstein, Edward P.
name: Hayden, Joseph S.
name: Sapak, David L.
name: Warrington, David E.
name: Marker III, Alex J.
Publisher: name: Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft
Year: 1995
Subjects: subject: 660

description: Results from small-scale glass melting experiments aimed at reducing the density of platinum particles in phosphate laser glasses are discussed. The platinum particles originate from the crucibles used to melt the laser glass and can cause optical damage in glasses used in high-peak-power lasers. The melting experiments examine the effects of a) temperature and temperature gradients; b) processing time; and c) O₂ atmosphere on the formation and dissolution of platinum inclusions in LG-750 phosphate laser glass. Results show that most platinum inclusions originate early in the melt cycle, with thermal gradients within the melter being one of the major causes. By using oxidizing conditions (O₂), the platinum inclusions can be dissolved into the glass during the course of the melt cycle. Results from the laboratory-scale melting experiments have been incorporated into a proprietary laser-glass melting process. The laser glass prepared under these conditions has an average of less than 0.1 platinum inclusions/1, which represents a 1000-fold reduction over the previously available phosphate laser glasses.
Lernerfahrungen für die ökumenische Dekade "Solidarität der Kirchen mit den Frauen 1988-1998"
Creators: name: Wartenberg-Potter, Bärbel Von
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 38 Nr. 2 (1989): Ökumenische Rundschau, Band 38, Heft 2
Floquet-Bloch Oscillations and Intraband Zener Tunneling in an Oblique Spacetime Crystal
Creators: name: Gao, Qiang
name: Niu, Qian
Publisher: name: arXiv
Year: 2020
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We investigate an oblique spacetime crystal realized by a monoatomic crystal in which a mode of sound propagates. We provide a systematic analysis of the crystal and obtain the corresponding band structure, based on which the electron dynamics under an external electric field is studied. Several unique band topologies are revealed, which lead to novel Floquet-Bloch oscillations in the electron's motion. We also discover intraband Zener tunneling in the oblique spacetime crystal beyond the adiabatic limit, which effectively converts between the different band topologies. Our results indicate the possibility of a prototypical quantum acoustoelectric generator that converts energy between the sound wave and a DC electric field in quantized units.
description: 5 pages, 3 figures in the main text and 4 pages, 3 figures in the supplemental material