cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
BRITE photometry and STELLA spectroscopy of bright stars in Auriga: Rotation, pulsation, orbits, and eclipses
Creators: name: Strassmeier, K. G.
name: Granzer, T.
name: Weber, M.
name: Kuschnig, R.
name: Pigulski, A.
name: Popowicz, A.
name: Moffat, A. F. J.
name: Wade, G. A.
name: Zwintz, K.
name: Handler, G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Continuous photometry with up to three BRITE satellites was obtained for 12 targets and subjected to a period search. Contemporaneous high-resolution optical spectroscopy with STELLA was used to obtain radial velocities through cross correlation with template spectra as well as to determine astrophysical parameters through a comparison with model spectra. The Capella red light curve was found to be constant over 176 days with a root mean square of 1 mmag, but the blue light curve showed a period of 10.1$\pm$0.6 d, which we interpret to be the rotation period of the G0 component. The BRITE light curve of the F0 supergiant $\varepsilon$Aur suggests 152 d as its main pulsation period, while the STELLA radial velocities reveal a clear 68 d period. An ingress of an eclipse of the $ζ$Aur binary system was covered with BRITE and a precise timing for its eclipse onset derived. $η$Aur is identified as a slowly pulsating B (SPB) star with a main period of 1.29 d and is among the brightest SPB stars discovered so far. The rotation period of the magnetic Ap star $θ$Aur is detected from photometry and spectroscopy with a period of 3.6189 d and 3.6177 d, respectively, likely the same within the errors. Photometric rotation periods are also confirmed for the magnetic Ap star $τ$Aur of 2.463 d and for the solar-type star $κ^1$Cet of 9.065 d, and also for the B7 HgMn giant $β$Tau of 2.74 d. Revised orbital solutions are derived for the eclipsing SB2 binary $β$Aur, for the 27 year eclipsing SB1 $\varepsilon$Aur, and for the RS CVn binary HR 1099. The two stars $ν$ Aur and $ι$Aur are found to be long-term, low-amplitude RV and brightness variables, but provisional orbital elements based on a period of 20 yr and an eccentricity of 0.7 could only be extracted for $ν$Aur. The variations of $ι$Aur are due to oscillations with a period of $\approx$4 yr.
Some Aspects of Testing Process for Transport Streams in Digital Video Broadcasting
Creators: name: Arsinte, Radu
name: Ilioaei, Ciprian
Publisher: name: arXiv
Year: 2008
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Multimedia (cs.MM)
subject: FOS: Computer and information sciences

description: This paper presents some aspects related to the DVB (Digital Video Broadcasting) investigation. The basic aspects of DVB are presented, with an emphasis on DVB-T version of standard. The main purpose of this research is to analyze the way that the transmission of the transport streams is realized in case of the Terrestrial Digital Video Broadcasting (DVB-T). To accomplish this, first, Digital Video Broadcasting standard is presented, and then the main aspects of DVB testing and analysis of the transport streams are investigated. The paper presents also the results obtained using two programs designed for DVB analysis: Mosalina and TSA.
description: 5 pages, 3 figures, 3 tables
The signature of granulation in a solar power spectrum as seen with CO$^5$BOLD
Creators: name: Lundkvist, Mia S.
name: Ludwig, Hans-Günter
name: Collet, Remo
name: Straus, Thomas
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The granulation background seen in the power spectrum of a solar-like oscillator poses a serious challenge for extracting precise and detailed information about the stellar oscillations. Using a 3D hydrodynamical simulation of the Sun computed with CO$^5$BOLD, we investigate various background models to infer, using a Bayesian methodology, which one provides the best fit to the background in the simulated power spectrum. We find that the best fit is provided by an expression including the overall power level and two characteristic frequencies, one with an exponent of 2 and one with a free exponent taking on a value around 6. We assess the impact of the 3D hydro-code on this result by repeating the analysis with a simulation from Stagger and find that the main conclusion is unchanged. However, the details of the resulting best fits differ slightly between the two codes, but we explain this difference by studying the effect of the spatial resolution and the duration of the simulation on the fit. Additionally, we look into the impact of adding white noise to the simulated time series as a simple way to mimic a real star. We find that, as long as the noise level is not too low, the results are consistent with the no-noise case.
description: 10 pages, 9 figures. This is a pre-copyedited, author-produced PDF of an article accepted for publication in MNRAS following peer review
Coherent amplitudon generation in K_0.3MoO_3 through ultrafast inter-band quasi particle decay
Creators: name: Sagar, D. M.
name: Tsvetkov, A. A.
name: Fausti, D.
name: van Smaalen, S.
name: van Loosdrecht, P. H. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The charge density wave system K_0.3MoO_3 has been studied using variable energy pump-probe spectroscopy, ellipsometry, and inelastic light scattering. The observed transient reflectivity response exhibits quite a complex behavior, containing contributions due to quasi particle excitations, coherent amplitudons and phonons, and heating effects. The generation of coherent amplitudons is discussed in terms of relaxation of photo-excited quasi particles, and is found to be resonant with the interband plasmon frequency. Two additional coherent excitations observed in the transients are assigned to zone-folding modes of the charge density wave state.
Afghanistan's WTO Membership: Paving Passage to Global Trade
Creators: name: Hashimy, Sayed Qudrat
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 480308
subject: International trade and investment law

description: Sayed Qudrat Hashimy, The Transformative Impact of WTO Membership on Afghanistan, 27 DELHI BUSINESS REVIEW (2023), https://www.delhibusinessreview.org/latest.htm.
Some results on the rotated infinitely deep potential and its coherent states
Creators: name: Bagarello, Fabio
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The Swanson model is an exactly solvable model in quantum mechanics with a manifestly non self-adjoint Hamiltonian whose eigenvalues are all real. Its eigenvectors can be deduced easily, by means of suitable ladder operators. This is because the Swanson Hamiltonian is deeply connected with that of a standard quantum Harmonic oscillator, after a suitable rotation in configuration space is performed. In this paper we consider a rotated version of a different quantum system, the infinitely deep potential, and we consider some of the consequences of this rotation. In particular, we show that differences arise with respect to the Swanson model, mainly because of the technical need of working, here, with different Hilbert spaces, rather than staying in $\Lc^2(\mathbb{R})$. We also construct Gazeau-Klauder coherent states for the system, and analyse their properties.
description: in press in Physica A
Maneuvering the maze : exploring the experiences of fetal alcohol effected adults
Creators: name: Straarup, Darlene
Publisher: name: University of British Columbia
Year: 2009

description: Research over the past decade has primarily concentrated on the problems of Fetal Alcohol Syndrome (FAS) and Alcohol Related Effects during infancy and childhood. Currently there are only very limited studies which are concerned with fetal alcohol syndrome or alcohol related effects in adulthood. This qualitative, exploratory study researched the experiences of five adults who have fetal alcohol syndrome or effects. The significant themes which emerged revealed that FAS/E has an impact on cognitive development and self esteem. In addition to this, elements of support were defined by the participants, which lead to directions regarding what helps this population group. This study has particular relevance to social work in that understanding the nature of FAS or alcohol related effects in adulthood, leads to appropriate therapeutic intervention both at a micro and macro level.
White dwarf spins from low mass stellar evolution models
Creators: name: Suijs, M. P. L.
name: Langer, N.
name: Poelarends, A. -J.
name: Yoon, S. -C.
name: Heger, A.
name: Herwig, F.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The prediction of the spins of the compact remnants is a fundamental goal of the theory of stellar evolution. Here, we confront the predictions for white dwarf spins from evolutionary models including rotation with observational constraints. We perform stellar evolution calculations for stars in the mass range 1... 3$\mso$, including the physics of rotation, from the zero age main sequence into the TP-AGB stage. We calculate two sets of model sequences, with and without inclusion of magnetic fields. From the final computed models of each sequence, we deduce the angular momenta and rotational velocities of the emerging white dwarfs. While models including magnetic torques predict white dwarf rotational velocities between 2 and 10 km s$^{-1}$, those from the non-magnetic sequences are found to be one to two orders of magnitude larger, well above empirical upper limits. We find the situation analogous to that in the neutron star progenitor mass range, and conclude that magnetic torques may be required in order to understand the slow rotation of compact stellar remnants in general.
description: Accepted for A&A Letters
Towards room-temperature superconductivity
Creators: name: Szeftel, Jacob
name: Sandeau, Nicolas
name: Ghantous, Michel Abou
name: El-Saba, Muhammad
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: By taking advantage of a stability criterion established recently, the critical temperature $T_c$ is reckoned with help of the microscopic parameters, characterising the normal and superconducting electrons, namely the independent-electron band structure and a \textit{repulsive} two-electron force. The emphasis is laid on the sharp $T_c$ dependence upon electron concentration and inter-electron coupling, which might offer a practical route toward higher $T_c$ values and help to understand why high-$T_c$ compounds exhibit such remarkable properties.
description: 4 pages, 2 figures. arXiv admin note: text overlap with arXiv:2006.13672
Hot, unpredictable weather interacts with land use to restrict the distribution of the Yellow-tailed Black-Cockatoo
Creators: name: Amin, Rahil J.
name: Buettel, Jessie C.
name: Fielding, Matthew W.
name: Vaughan, Peter M.
name: Brook, Barry W.
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: FOS: Biological sciences
subject: 69999 Biological Sciences not elsewhere classified

description: Conserving nomadic species is challenging due to the difficulty in monitoring their characteristically transient populations, and thereby detecting range-wide declines. An example is the Yellow-tailed Black-Cockatoo (YTBC; Zanda funerea), which disperses widely in search of food and is regularly – but sporadically – observed across eastern Australia. Under climate warming, a general southward shift in species distributions is expected in the southern hemisphere, with the extreme southern margins being truncated by an ocean barrier. Given these constraints, we ask whether sufficient refugia will exist for the YTBC in the future, by: (i) modelling habitat relationships within the current geographic range of the YTBC based on weather, climate, vegetation, and land use, and (ii) using this framework, coupled with climate-model projections, to forecast 21st century impacts. Intensive land use and high variability in temperature and rainfall seem to most limit YTBC occurrence. In contrast, areas with a cooler, stable climate and a network of old-growth forests, such as those in parts of south-eastern Australia and Tasmania, are most suitable for the species. As Australia becomes progressively hotter under climate change, the preferred bioclimatic envelope of the YTBC is forecast to contract poleward (as a general pattern) and to fragment within the existing range. However, despite an extensive loss of climatically suitable regions, the YTBC might find stable refugia at the southern margins of its geographic range, although continued loss of old-growth forests undermines their nesting potential. Therefore, beyond habitat conservation, creating nesting opportunities within plantation forests would likely be an effective conservation strategy to preserve habitat quality in climate refugia.
The abundance pattern of O, Mg, Si and Fe in the intracluster medium of the Centaurus cluster observed with XMM-Newton
Creators: name: Matsushita, Kyoko
name: Boehringer, Hans
name: Takahashi, Isao
name: Ikebe, Yasushi
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The abundances of O, Mg, Si and Fe in the intracluster medium of the Centaurus cluster are derived. The Fe abundance has a negative radial gradient. In solar units, the Si abundance is close to the Fe abundance, while the O and Mg abundances are much smaller. The high Fe/O and Si/O ratio indicate that metal supply from supernovae Ia is important and supernovae Ia synthesize Si as well as Fe. Within 2$'$, the O and Mg abundances are consistent with the stellar metallicity of the cD galaxy derived from the Mg$_2$ index. This result indicates that the central gas is dominated by the gas from the cD galaxy. The observed abundance pattern of the Centaurus cluster resembles to those observed in center of other clusters and groups of galaxies. However, the central Fe abundance and the Si/Fe ratio are 40 % higher and 30% smaller than those of M 87, respectively. Since the accumulation timescale of the supernovae Ia is higher in the Centaurus cluster, these differences imply a time dependence of nucleosynthesis by supernovae Ia.
description: 12pages, 19 figures, accepted to A&A
A Kapitza-Dirac-Talbot-Lau interferometer for highly polarizable molecules
Creators: name: Gerlich, Stefan
name: Hackermueller, Lucia
name: Hornberger, Klaus
name: Stibor, Alexander
name: Ulbricht, Hendrik
name: Gring, Michael
name: Goldfarb, Fabienne
name: Savas, Tim
name: Mueri, Marcel
name: Mayor, Marcel
name: Arndt, Markus
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Research on matter waves is a thriving field of quantum physics and has recently stimulated many investigations with electrons, neutrons, atoms, Bose-condensed ensembles, cold clusters and hot molecules. Coherence experiments with complex objects are of interest for exploring the transition to classical physics, for measuring molecular properties and they have even been proposed for testing new models of space-time. For matter-wave experiments with complex molecules, the strongly dispersive effect of the interaction between the diffracted molecule and the grating wall is a major challenge because it imposes enormous constraints on the velocity selection of the molecular beam. We here describe the first experimental realization of a new interferometer that solves this problem by combining the advantages of a Talbot-Lau setup with the benefits of an optical phase grating and we show quantum interference with new large molecules.
description: 13 pages, 4 figures
[Tajuasohn field notebook]
Creators: name: Seller, Kathryn
name: Oswalt, Robert L.
name: Oswalt Family
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: ale
subject: tja

description: Vocabulary, morphology, and songs in Tajuasohn (a Kru language) along with some Aluet vocabulary. Labeled "Book I".
Copy of letter from R. A. Lambert to J. E. [John Edgar] McAllister, November 11, 1916
Creators: name: Lambert, R. A.
Publisher: name: The University of British Columbia
Year: 2017

description: Copy of a letter to J. E. [John Edgar] McAllister, from R. A. Lambert, dated Novemeber 11, 1916, regarding payments received; enclosed within a letter from McAllister to Goldie, dated November 16, 1916.
Multiple stellar populations in Asymptotic Giant Branch stars of Galactic Globular Clusters
Creators: name: Lagioia, E. P.
name: Milone, A. P.
name: Marino, A. F.
name: Tailo, M.
name: Renzini, A.
name: Carlos, M.
name: Cordoni, G.
name: Dondoglio, E.
name: Jang, S.
name: Karakas, A.
name: Dotter, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Multiple stellar populations (MPs) are a distinct characteristic of Globular Clusters (GCs). Their general properties have been widely studied among main sequence, red giant branch (RGB) and horizontal branch (HB) stars, but a common framework is still missing at later evolutionary stages. We studied the MP phenomenon along the AGB sequences in 58 GCs, observed with the Hubble Space Telescope in ultraviolet (UV) and optical filters. By using UV-optical color-magnitude diagrams, we selected the AGB members of each cluster and identified the AGB candidates of the metal-enhanced population in type II GCs. We studied the photometric properties of AGB stars and compared them to theoretical models derived from synthetic spectra analysis. We observe the following features: i) the spread of AGB stars in photometric indices sensitive to variations of light-elements and helium is typically larger than that expected from photometric errors; ii) the fraction of metal-enhanced stars in the AGB is lower than in the RGB in most of the type II GCs; iii) the fraction of 1G stars derived from the chromosome map of AGB stars in 15 GCs is larger than that of RGB stars; v) the AGB/HB frequency correlates with the average mass of the most helium-enriched population. These findings represent a clear evidence of the presence of MPs along the AGB of Galactic GCs and indicate that a significant fraction of helium-enriched stars, which have lower mass in the HB, does not evolve to the AGB phase, leaving the HB sequence towards higher effective temperatures, as predicted by the AGB-manqué scenario.
description: 32 pages, 19 figures, 3 tables
Gauged (2,2) Sigma Models and Generalized Kahler Geometry
Creators: name: Merrell, Willie
name: Zayas, Leopoldo A. Pando
name: Vaman, Diana
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We gauge the (2,2) supersymmetric non-linear sigma model whose target space has bihermitian structure (g, B, J_{\pm}) with noncommuting complex structures. The bihermitian geometry is realized by a sigma model which is written in terms of (2,2) semi-chiral superfields. We discuss the moment map, from the perspective of the gauged sigma model action and from the integrability condition for a Hamiltonian vector field. We show that for a concrete example, the SU(2) x U(1) WZNW model, as well as for the sigma models with almost product structure, the moment map can be used together with the corresponding Killing vector to form an element of T+T* which lies in the eigenbundle of the generalized almost complex structure. Lastly, we discuss T-duality at the level of a (2,2) sigma model involving semi-chiral superfields and present an explicit example.
description: 33 pages
The importance of preening behaviour in the at-sea time budget of Australasian gannets
Creators: name: Fauchet, Louarn
name: Cansse, Thomas
name: Arnould, John P.Y.
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified

description: Feathers play an important role in many aspects of avian ecology, including sexual selection, thermoregulation and flight. However, several external stressors can negatively impact plumage condition. Birds preen their feathers to maintain feather integrity throughout the year. For seabirds, preening is especially important to ensure waterproofing of the plumage. However, due to the difficulty of observing seabirds at sea, little is known of the time and energy expended in preening and how this may impact other activities in these species. In the present study, bird-borne video and tri-axial accelerometer data loggers were used to investigate preening in Australasian Gannets (Morus serrator) from two colonies in south-eastern Australia. Gannets spend a substantial proportion of their time at sea preening (25.5 ± 1.7%). No significant differences in preening activity were observed between the 3 years of study or between colonies. Average Vectorial Dynamic Body Acceleration (VeDBA, a proxy for energy expenditure) was significantly higher during preening (0.34 ± 0.02 g) than resting (0.25 ± 0.02 g), but less than for flying or foraging. These results highlight the importance of preening in terms of time and energy in this species. Furthermore, a positive relationship between the number of dives and at-sea preening suggests a negative impact of diving on plumage integrity and, thus, a potential additional time and energy constraint during periods of reduced food availability.
Multipole decomposition of redshift drift -- model independent mapping of the expansion history of the Universe
Creators: name: Heinesen, Asta
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We consider redshift drift in a general space-time as expressed in terms of physically interpretable multipole series. An important realisation from the derived results is that redshift drift cannot in general be thought of as a direct probe of the average expansion rate of the Universe due to the presence of structure along the light beams from the astrophysical sources to the observer. We also predict the general presence of a dipolar and a quadrupolar offset in the detection of redshift drift for observers placed in locally anisotropic environments.
description: 4 pages
Implementing a Test Strategy for an Advanced Video Acquisition and Processing Architecture
Creators: name: Arsinte, Radu
Publisher: name: arXiv
Year: 2008
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Multimedia (cs.MM)
subject: FOS: Computer and information sciences

description: This paper presents some aspects related to test process of an advanced video system used in remote IP surveillance. The system is based on a Pentium compatible architecture using the industrial standard PC104+. First the overall architecture of the system is presented, involving both hardware or software aspects. The acquisition board which is developed in a special, nonstandard architecture, is also briefly presented. The main purpose of this research was to set a coherent set of procedures in order to test all the aspects of the video acquisition board. To accomplish this, it was necessary to set-up a procedure in two steps: stand alone video board test (functional test) and an in-system test procedure verifying the compatibility with both OS: Linux and Windows. The paper presents also the results obtained using this procedure.
description: 5 pages, 17 figures
Vibrations of liquid drops in film boiling phenomena: the mathematical model
Creators: name: Casal, Pierre
name: Gouin, Henri
Publisher: name: arXiv
Year: 2008
Subjects: subject: Classical Physics (physics.class-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Flattened liquid drops poured on a very hot surface evaporate quite slowly and float on a film of their own vapour. In the cavities of a surface, an unusual type of vibrational motions occurs. Large vibrations take place and different forms of dynamic drops are possible. They form elliptic patterns with two lobes or hypotrochoid patterns with three lobes or more. The lobes are turning relatively to the hot surface. We present a model of vibrating motions of the drops. Frequencies of the vibrations are calculated regarding the number of lobes. The computations agree with experiments.
description: This paper seems to be the only theoretical model of "vibrations of liquid drops in film boiling phenomena" proposed in the literature. 11 pages, 1 table and 2 figures
A Catalog of 220 Offset and Dual AGNs: Increased AGN Activation in Major Mergers and Separations under 4 kpc
Creators: name: Stemo, Aaron
name: Comerford, Julia M.
name: Barrows, R. Scott
name: Stern, Daniel
name: Assef, Roberto J.
name: Griffith, Roger L.
name: Schechter, Aimee
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: During galaxy mergers, gas and dust is driven towards the centers of merging galaxies, triggering enhanced star formation and supermassive black hole (SMBH) growth. Theory predicts that this heightened activity peaks at SMBH separations $
description: 19 pages, 9 figures, submitted to ApJ
Muon-spin relaxation measurements on the dimerized spin-1/2 chains NaTiSi2O6 and TiOCl
Creators: name: Baker, P. J.
name: Blundell, S. J.
name: Pratt, F. L.
name: Lancaster, T.
name: Brooks, M. L.
name: Hayes, W.
name: Isobe, M.
name: Ueda, Y.
name: Hoinkis, M.
name: Sing, M.
name: Klemm, M.
name: Horn, S.
name: Claessen, R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report muon spin relaxation (muSR) and magnetic susceptibility investigations of two Ti3+ chain compounds which each exhibit a spin gap at low temperature, NaTiSi2O6 and TiOCl. From these we conclude that the spin gap in NaTiSi2O6 is temperature independent, with a value of 2*Delta=660(50)K, arising from orbital ordering at Too = 210K; the associated structural fluctuations activate the muon spin relaxation rate up to temperatures above 270K. In TiOCl we find thermally activated spin fluctuations corresponding to a spin gap 2*Delta=420(40)K below Tc1=67K. We also compare the methods used to extract the spin gap and the concentration of free spins within the samples from muSR and magnetic susceptibility data.
description: 4 pages, 3 figures
Quantum critical point in the Kondo-Heisenberg model on the honeycomb lattice
Creators: name: Saremi, Saeed
name: Lee, Patrick A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the Kondo--Heisenberg model on the honeycomb lattice at half-filling. Due to the vanishing of the density of states at the fermi level, the Kondo insulator disappears at a finite Kondo coupling even in the absence of the Heisenberg exchange. We adopt a large-N formulation of this model and use the renormalization group machinery to study systematically the second order phase transition of the Kondo insulator (KI) to the algebraic spin liquid (ASL). We note that neither phase breaks any physical symmetry, so that the transition is not described by the standard Ginzburg-Landau-Wilson critical point. We find a stable Lorentz-invariant fixed point that controls this second order phase transition. We calculate the exponent $ν$ of the diverging length scale near the transition. The quasi-particle weight of the conduction electron vanishes at this KI--ASL fixed point, indicating non-Fermi liquid behavior. The algebraic decay exponent of the staggered spin correlation is calculated at the fixed point and in the ASL phase. We find a jump in this exponent at the transition point.
description: The published version. New title. Very minor changes in the abstract and introduction compared to the original version
Instabilities and transition in cooled-wall hypersonic boundary layers
Creators: name: Unnikrishnan, S.
name: Gaitonde, Datta V.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Wall cooling has substantial effects on the development of instabilities and transition processes in hypersonic boundary layers (HBLs). A sequence of linear stability theory, two-dimensional and non-linear three-dimensional DNSs is used to analyze Mach~6 boundary layers, with wall temperatures ranging from near-adiabatic to highly cooled conditions, where the second-mode instability radiates energy. Fluid-thermodynamic analysis shows that this radiation comprises both acoustic as well as vortical waves. 2D simulations show that the conventional "trapped" nature of second-mode instability is ruptured. Although the energy efflux of both acoustic and vortical components increases with wall-cooling, the destabilization effect is much stronger and no significant abatement of pressure perturbations is realized. In the near-adiabatic HBL, the wavepacket remains trapped within the boundary layer and attenuates outside the region of linear instability. However, wavepackets in the cooled-wall HBLs amplify and display nonlinear distortion, and transition more rapidly. The structure of the wavepacket displays different behavior; moderately-cooled walls show bifurcation into a leading turbulent head region and a trailing harmonic region, while highly-cooled wall cases display lower convection speeds and significant wavepacket elongation, with intermittent spurts of turbulence in the wake of the head region. This elongation effect is associated with a weakening of the lateral jet mechanism due to the breakdown of spanwise coherent structures. In moderately cooled-walls, the spatially-localized wall loading is due to coherent structures in the leading turbulent head region. In highly-cooled walls, the elongated near-wall streaks in the wake region of the wavepacket result in more than twice as large levels of skin friction and heat transfer over a sustained period of time.
From di-hadron correlations to parton intrinsic transverse momentum in proton-proton collisions
Creators: name: Fai, G.
name: Levai, P.
name: Papp, G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Di-hadron correlations in proton-proton collisions at s^1/2 = 200 GeV are interpreted in terms of a fragmentation width and a momentum imbalance. A fragmentation width of 580 +- 50 GeV/c is obtained, and the momentum imbalance gives an `intrinsic' transverse momentum width of partons in the proton of 2.6 +- 0.2 GeV/c.
description: Talk given at 2nd International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions (Hard Probes 2006), Asilomar, Pacific Grove, California, 9-16 Jun 2006
Nonperturbative deformation of D-brane states by the world sheet noncommutativity
Creators: name: Irisawa, Manabu
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: By introducing the noncommutativity in the world sheet, we discuss a modification of the D-brane states in the closed string theory. In particular we show how the world sheet noncommutativity induces a nonperturbative effect to the D-brane states.
description: 10 pages, no figures
Detecting extreme mass ratio inspiral events in LISA data using the Hierarchical Algorithm for Clusters and Ridges (HACR)
Creators: name: Gair, Jonathan R
name: Jones, Gareth
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: One of the most exciting prospects for the Laser Interferometer Space Antenna (LISA) is the detection of gravitational waves from the inspirals of stellar-mass compact objects into supermassive black holes. Detection of these sources is an extremely challenging computational problem due to the large parameter space and low amplitude of the signals. However, recent work has suggested that the nearest extreme mass ratio inspiral (EMRI) events will be sufficiently loud that they might be detected using computationally cheap, template-free techniques, such as a time-frequency analysis. In this paper, we examine a particular time-frequency algorithm, the Hierarchical Algorithm for Clusters and Ridges (HACR). This algorithm searches for clusters in a power map and uses the properties of those clusters to identify signals in the data. We find that HACR applied to the raw spectrogram performs poorly, but when the data is binned during the construction of the spectrogram, the algorithm can detect typical EMRI events at distances of up to $\sim2.6$Gpc. This is a little further than the simple Excess Power method that has been considered previously. We discuss the HACR algorithm, including tuning for single and multiple sources, and illustrate its performance for detection of typical EMRI events, and other likely LISA sources, such as white dwarf binaries and supermassive black hole mergers. We also discuss how HACR cluster properties could be used for parameter extraction.
description: 21 pages, 11 figures, submitted to Class. Quantum Gravity. Modified and shortened in light of referee's comments. Updated results consider tuning over all three HACR thresholds, and show 10-15% improvement in detection rate
Managing sequence-dependent setup times - The target conflict between output rate, WIP and fluctuating throughput times for setup cycles
Creators: name: Engehausen, Friederike
name: Lödding, Hermann
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: Science Policy
subject: Plasma Physics
subject: 60506 Virology

description: Sequence-dependent setup times cause a trade-off between output rate, WIP and fluctuating throughput times. Companies usually face this trade-off by bundling similar orders in setup families without quantifying its impact on the logistic objectives. This paper presents a simple model to quantify the influence of setup-optimised sequencing on the output rate, WIP and throughput times. On the one hand, the aim is to create a deeper understanding for the consequences of setup-optimised sequencing. On the other hand, companies are enabled to actively manage and position in the trade-off between the conflicting targets.
Epispathidium terricola Foissner 1987
Creators: name: Durán-Ramírez, Carlos Alberto
name: Dias, Roberto Júnio Pedroso
name: Estrada, Rosaura Mayén-
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Chromista
Ciliophora
Gymnostomatea
Spathidiida
Spathidiidae
Epispathidium
Epispathidium terricola

description: Epispathidium terricola Foissner, 1987
Distribution. VENEZUELA: South margin of the Henri Pittier National Park, Biological Station Rancho Grande (Foissner 2016).
description: Published as part of Durán-Ramírez, Carlos Alberto, Dias, Roberto Júnio Pedroso & Estrada, Rosaura Mayén-, 2020, Checklist of ciliates (Alveolata: Ciliophora) that inhabit in bromeliads from the Neotropical Region, pp. 1-36 in Zootaxa 4895 (1) on page 16, DOI: 10.11646/zootaxa.4895.1.1, http://zenodo.org/record/4321437
Colour and logarithmic accuracy in final-state parton showers
Creators: name: Hamilton, Keith
name: Medves, Rok
name: Salam, Gavin P.
name: Scyboz, Ludovic
name: Soyez, Gregory
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Standard dipole parton showers are known to yield incorrect subleading-colour contributions to the leading (double) logarithmic terms for a variety of observables. In this work, concentrating on final-state showers, we present two simple, computationally efficient prescriptions to correct this problem, exploiting a Lund-diagram type classification of emission regions. We study the resulting effective multiple-emission matrix elements generated by the shower, and discuss their impact on subleading colour contributions to leading and next-to-leading logarithms (NLL) for a range of observables. In particular we show that the new schemes give the correct full colour NLL terms for global observables and multiplicities. Subleading colour issues remain at NLL (single logarithms) for non-global observables, though one of our two schemes reproduces the correct full-colour matrix-element for any number of energy-ordered commensurate-angle pairs of emissions. While we carry out our tests within the PanScales shower framework, the schemes are sufficiently simple that it should be straightforward to implement them also in other shower frameworks.
description: 54 pages, 17 figures
Afghanistan's WTO Membership: Paving Passage to Global Trade
Creators: name: Hashimy, Sayed Qudrat
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 480308
subject: International trade and investment law

description: Sayed Qudrat Hashimy, The Transformative Impact of WTO Membership on Afghanistan, 24 DELHI BUSINESS REVIEW (2023), https://www.delhibusinessreview.org/v24n2.htm
Fluid-bicontinuous gels stabilized by interfacial colloids: low and high molecular weight fluids
Creators: name: Clegg, P. S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Carefully tuned composite materials can have properties wholly unlike their separate constituents. We review the development of one example: colloid-stabilized emulsions with bicontinuous liquid domains. These non-equilibrium structures resemble the sponge mesophase of surfactants; however, in the colloid-stabilized case the interface separating the liquid domains is itself semi-solid. The arrangement of domains is created by arresting liquid-liquid phase separation via spinodal decomposition. Dispersed colloids exhibiting partial wettability become trapped on the newly created interface and jam together as the domains coarsen. Similar structures have been created in polymer blends stabilized using either interfacial nanoparticles or clay platelets. Here it has been possible to create the domain arrangement either by phase separation or by direct mixing of the melt. The low molecular-weight liquid and polymer based structures have been developed independently and much can be learnt by comparing the two.
description: Topical Review, 17 pages, 10 figures
Emergent Fracton Dynamics in a Non-Planar Dimer Model
Creators: name: Feldmeier, Johannes
name: Pollmann, Frank
name: Knap, Michael
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We study the late time relaxation dynamics of a pure $U(1)$ lattice gauge theory in the form of a dimer model on a bilayer geometry. To this end, we first develop a proper notion of hydrodynamic transport in such a system by constructing a global conservation law that can be attributed to the presence of topological solitons. The correlation functions of local objects charged under this conservation law can then be used to study the universal properties of the dynamics at late times, applicable to both quantum and classical systems. Performing the time evolution via classically simulable automata circuits unveils a rich phenomenology of the system's non-equilibrium properties: For a large class of relevant initial states, local charges are effectively restricted to move along one-dimensional 'tubes' within the quasi-two-dimensional system, displaying fracton-like mobility constraints. The time scale on which these tubes are stable diverges with increasing systems size, yielding a novel mechanism for non-ergodic behavior in the thermodynamic limit. We further explore the role of geometry by studying the system in a quasi-one-dimensional limit, where the Hilbert space is strongly fragmented due to the emergence of an extensive number of conserved quantities. This provides an instance of a recently introduced concept of 'statistically localized integrals of motion', whose universal anomalous hydrodynamics we determine by a mapping to a problem of classical tracer diffusion. We conclude by discussing how our approach might generalize to study transport in other lattice gauge theories.
description: 14 + 5 pages; 13 + 1 figures
Pfingstliche Pneumatologie zwischen individueller Geisterfahrung und neuer sozialer Realität
Creators: name: Wenk, Matthias
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 60 Nr. 3 (2011): Ökumenische Rundschau, Band 60, Heft 3
Short-time inertial response of viscoelastic fluids measured with Brownian motion and with active probes
Creators: name: Atakhorrami, M.
name: Mizuno, D.
name: Koenderink, G. H.
name: Liverpool, T. B.
name: MacKintosh, F. C.
name: Schmidt, C. F.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We have directly observed short-time stress propagation in viscoelastic fluids using two optically trapped particles and a fast interferometric particle-tracking technique. We have done this both by recording correlations in the thermal motion of the particles and by measuring the response of one particle to the actively oscillated second particle. Both methods detect the vortex-like flow patterns associated with stress propagation in fluids. This inertial vortex flow propagates diffusively for simple liquids, while for viscoelastic solutions the pattern spreads super-diffusively, dependent on the shear modulus of the medium.
Casimir and Casimir-Polder Forces in Graphene Systems: Quantum Field Theoretical Description and Thermodynamics
Creators: name: Klimchitskaya, G. L.
name: Mostepanenko, V. M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We review recent results on the low-temperature behaviors of the Casimir-Polder and Casimir free energy an entropy for a polarizable atom interacting with a graphene sheet and for two graphene sheets, respectively. These results are discussed in the wide context of problems arising in the Lifshitz theory of van der Waals and Casimir forces when it is applied to metallic and dielectric bodies. After a brief treatment of different approaches to theoretical description of the electromagnetic response of graphene, we concentrate on the derivation of response function in the framework of thermal quantum field theory in the Matsubara formulation using the polarization tensor in (2+1)-dimensional space-time. The asymptotic expressions for the Casimir-Polder and Casimir free energy and entropy at low temperature, obtained with the polarization tensor, are presented for a pristine graphene as well as for graphene sheets possessing some nonzero energy gap $Δ$ and chemical potential $μ$ under different relationships between the values of $Δ$ and $μ$. Along with reviewing the results obtained in the literature, we present some new findings concerning the case of zero gap and nonzero chemical potential. The conclusion is made that the Lifshitz theory of the Casimir and Casimir-Polder forces in graphene systems using the quantum field theoretical description of a pristine graphene, as well as real graphene sheets with $Δ>2μ$ or $Δ<2μ$, is consistent with the requirements of thermodynamics. The case of graphene with $Δ=2μ\neq 0$ leads to an entropic anomaly, but is argued to be physically unrealistic. The way to a resolution of thermodynamic problems in the Lifshitz theory based on the results obtained for graphene is discussed.
description: 34 pages, 2 figures; Special issue "Development of Modern Methods of QFT and Their Applications"
A puhA gene deletion and plasmid complementation system for facile site directed mutagenesis studies of the reaction center H protein of Rhodobacter Sphaeroides
Creators: name: Chen, Xiaoyi
Publisher: name: University of British Columbia
Year: 2009

description: The development of a Rhodobacter sphaeroides deletion/plasmid complementation system of the puhA gene (which encodes the reaction center [RC] heavy [H] subunit) for expression of site directed mutants of the RC H protein is described. The mutant strain ΔPUHA was constructed by introduction of a translationally in-frame deleted puhA allele at the chromosomal puhA gene site, and evaluated in plasmid complementation experiments. Strain ΔPUHA was unable to grow under photosynthetic conditions. Absorption spectroscopy showed this strain has a reduction in the amount of the light-harvesting I (LHI) complex. SDS-PAGE analysis of chromatophore proteins of strain ΔPUHA confirmed the absence of the RC H protein band. When ΔPUHA was complemented in trans with the wild type puhA gene in plasmids, photosynthetic growth and the RC H protein band in SDS-PAGE were restored. The results of comparisons of the properties of strains with different types of chromosomal puhA gene disruptions in complementation experiments are consistent with the idea that expression of one or more genes located 3' of puhA is required for optimal RC levels and photosynthetic growth. Since the ΔPUHA translationally in-frame deletion does not seem to interfere with transcription through and beyond the residual puhA sequences, this strain allows facile evaluation of the consequences of plasmid-borne RC H mutations in an otherwise wild type genetic background. The role of the RC H subunit in photosynthesis is discussed.
Transverse single spin asymmetries in inclusive deep-inelastic scattering
Creators: name: Metz, A.
name: Schlegel, M.
name: Goeke, K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: In inclusive deep-inelastic lepton-hadron scattering multi-photon exchange between the leptonic and the hadronic part of the process causes single spin asymmetries. The asymmetries exist for a polarized target as well as a polarized incoming or outgoing lepton, if the polarization vector has a component transverse with respect to the reaction plane. The spin dependent parts of the single polarized cross sections are suppressed like $α_{em} m_{pol}/Q$ - where $m_{pol}$ denotes the mass of the polarized particle - compared to the leading terms of the cross section for unpolarized or double-polarized deep-inelastic scattering. Both the target and the beam spin asymmetry are evaluated in the parton model. In the calculation only quark-quark correlators are included. While this approximation turns out to be justified for the lepton spin asymmetries, it is not sufficient for the target asymmetry.
description: 9 pages, 1 figure, minor changes, final version, to appear in Phys. Lett. B
Letter from J. E. [John Edgar] McAllister to Mr. [James] Goldie, November 27, 1916
Creators: name: McAllister, John Edgar
Publisher: name: The University of British Columbia
Year: 2017

description: Letter to Mr. [James] Goldie from J. E. [John Edgar] McAllister, dated November 27, 1916, updating James Goldie on his trip after he visited him.