cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Inversion of horizontal loop electromagnetic soundings over a stratified earth
Creators: name: Fullagar, Peter Kelsham
Publisher: name: University of British Columbia
Year: 2010

description: A detailed study of electromagnetic induction in a sequence of conductive layers has been completed for the case when the inducing fields are generated by an alternating current in a horizontal loop. The study was undertaken with a view to the development of a computer program to perform automatic inversion of horizontal loop electromagnetic (HLEM) frequency soundings taken over horizontally stratified ground. The program constitutes a new implementation of the general approach of Backus and Gilbert (1967, 1968, 1970). By means of a linearised iterative scheme, it constructs layered conductivities which satisfy a given set of observations to an accuracy consistent with the observational uncertainties. Subsequently, the non-uniqueness admitted by the limited amount of data can be appraised by computing averages of the original constructed model and comparing them with averages corresponding to other dissimilar models which also satisfy the data. In examples the Backus-Gilbert averages faithfully reflect the character of the "true" conductivity in regions of high conductivity, but they are of limited value in delineating resistive zones. The program has been applied successfully to the inversion of real data from Grass Valley, Nevada. A uniqueness theorem is presented for inversion of HLEM frequency soundings. It has been proved that an unlimited quantity of perfectly accurate HLEM frequency soundings (at a fixed receiver location) suffices to completely determine the conductivity as a function of depth. This result, which is believed to be new, enhances the credibility of conclusions based on inversion of HLEM soundings.
The relation between Lyman-alpha absorbers and gas--rich galaxies in the local universe
Creators: name: Pierleoni, Marco
name: Branchini, Enzo
name: Viel, Matteo
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We use high-resolution hydrodynamical simulations to investigate the spatial correlation between weak (N(HI) <10^{15} cm^{-2}) Ly-alpha absorbers and gas-rich galaxies in the local universe. We confirm that Ly-alpha absorbers are preferentially expected near gas-rich galaxies and that the degree of correlation increases with the column density of the absorber. The real-space galaxy auto-correlation is stronger than the cross-correlation (correlation lengths r_{0,gg}=3.1 \pm 0.1 Mpc/h and r_{0,ag}=1.4 \pm 0.1 Mpc/h, respectively), in contrast with the recent results of Ryan-Weber (2006, RW06), and the auto-correlation of absorbers is very weak. These results are robust to the presence of strong galactic winds in the hydrodynamical simulations. In redshift-space a further mismatch arises since at small separations the distortion pattern of the simulated galaxy-absorber cross-correlation function is different from the one measured by RW06. However, when sampling the intergalactic medium along a limited number of lines-of-sight, as in the real data, uncertainties in the cross correlation estimates are large enough to account for these discrepancies. Our analysis suggests that the statistical significance of difference between the cross-correlation and auto-correlation signal in current datasets is ~ 1-sigma only.
description: 11+ pages, 9 figures. MNRAS in press
Elastic nonlinearities in a one-dimensional model of fracture
Creators: name: Bouchbinder, Eran
name: Lo, Ting-Shek
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The dynamics of rapid brittle cracks is commonly studied in the framework of linear elastic fracture mechanics where nonlinearities are neglected. However, recent experimental and theoretical work demonstrated explicitly the importance of elastic nonlinearities in fracture dynamics. We study two simple one-dimensional models of fracture in order to gain insights about the role of elastic nonlinearities and the implications of their exclusion in the common linear elastic approximation. In one model we consider the decohesion of a nonlinear elastic membrane from a substrate. In a second model we follow the philosophy of linear elastic fracture mechanics and study a linearized version of the nonlinear model. By analyzing the steady state solutions, the velocity-load relations and the response to perturbations of the two models we show that the linear approximation fails at finite crack tip velocities. We highlight certain features of the breakdown of the linear theory and discuss possible implications of our results to higher dimensional systems.
description: 9 pages, 6 figures, related papers: arXiv:0807.4866 and arXiv:0807.4868
The Dynamics of Chern-Simons Vortices
Creators: name: Collie, Benjamin
name: Tong, David
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study vortex dynamics in three-dimensional theories with Chern-Simons interactions. The dynamics is governed by motion on the moduli space M in the presence of a magnetic field. For Abelian vortices, the magnetic field is shown to be the Ricci form over M; for non-Abelian vortices, it is the first Chern character of a suitable index bundle. We derive these results by integrating out massive fermions and following the fate of their zero modes.
description: 24 pages, 3 figures. v2: references added
Effects of gamma irradiation on DEPFET pixel sensors for the Belle II experiment
Creators: name: Schreeck, Harrison
name: Schwenker, Benjamin
name: Wieduwilt, Philipp
name: Frey, Ariane
name: Paschen, Botho
name: Lütticke, Florian
name: Ahlburg, Patrick
name: Dingfelder, Jochen
name: Marinas, Carlos
name: Andricek, Ladislav
name: Richter, Rainer
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: For the Belle II experiment at KEK (Tsukuba, Japan) the KEKB accelerator was upgraded to deliver a 40 times larger instantaneous luminosity than before, which requires an increased radiation hardness of the detector components. As the innermost part of the Belle II detector, the pixel detector (PXD), based on DEPFET (DEpleted P-channel Field Effect Transistor) technology, is most exposed to radiation from the accelerator. An irradiation campaign was performed to verify that the PXD can cope with the expected amount of radiation. We present the results of this measurement campaign in which an X-ray machine was used to irradiate a single PXD half-ladder to a total dose of 266 kGy. The half-ladder is from the same batch as the half-ladders used for Belle II. According to simulations, the total accumulated dose corresponds to 7-10 years of Belle II operation. While individual components have been irradiated before, this campaign is the first full system irradiation. We discuss the effects on the DEPFET sensors, as well as the performance of the front-end electronics. In addition, we present efficiency studies of the half-ladder from beam tests performed before and after the irradiation.
description: 17 pages, 12 figures
Thermodynamics on Noncommutative Geometry in Coherent State Formalism
Creators: name: Huang, Wung-Hong
name: Huang, Kuo-Wei
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The thermodynamics of ideal gas on the noncommutative geometry in the coherent state formalism is investigated. We first evaluate the statistical interparticle potential and see that there are residual "attraction (repulsion) potential" between boson (fermion) in the high temperature limit. The characters could be traced to the fact that, the particle with mass $m$ in noncommutative thermal geometry with noncommutativity $θ$ and temperature $T$ will correspond to that in the commutative background with temperature $T(1+kTmθ)^{-1}$. Such a correspondence implies that the ideal gas energy will asymptotically approach to a finite limiting value as that on commutative geometry at $T_θ= (kmθ)^{-1}$. We also investigate the squeezed coherent states and see that they could have arbitrary mean energy. The thermal properties of those systems are calculated and compared to each other. We find that the heat capacity of the squeezed coherent states of boson and fermion on the noncommutative geometry have different values, contrast to that on the commutative geometry.
description: Add analysis about thermodynamics of squeezed coherent state, Latex 12 pages
Isospin-symmetry-breaking corrections to superallowed Fermi beta decay: Formalism and schematic models
Creators: name: Miller, G. A.
name: Schwenk, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We study the formalism to include isospin-symmetry-breaking corrections when extracting the up-down Cabibbo-Kobayashi-Maskawa matrix element from superallowed 0+ -> 0+ nuclear beta decay. We show that there are no first order isospin-symmetry-breaking corrections to the relevant nuclear matrix elements. We find corrections to the treatment of Towner and Hardy, and assess these using schematic models of increasing complexity.
description: 8 pages; NT@UW-08-08; added reference, published version
Metamagnetic transition in EuFe$_2$As$_2$ single crystals
Creators: name: Jiang, Shuai
name: Luo, Yongkang
name: Ren, Zhi
name: Zhu, Zengwei
name: Wang, Cao
name: Xu, Xiangfan
name: Tao, Qian
name: Cao, Guanghan
name: Xu, Zhu'an
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report the measurements of anisotropic magnetization and magnetoresistance on single crystals of EuFe$_2$As$_2$, a parent compound of ferro-arsenide high-temperature superconductor. Apart from the antiferromagnetic (AFM) spin-density-wave transition at 186 K associated with Fe moments, the compound undergoes another magnetic phase transition at 19 K due to AFM ordering of Eu$^{2+}$ spins ($J=S=7/2$). The latter AFM state exhibits metamagnetic transition under magnetic fields. Upon applying magnetic field with $H\parallel c$ at 2 K, the magnetization increases linearly to 7.0 $μ_{B}$/f.u. at $μ_{0}H$=1.7 T, then keeps at this value of saturated Eu$^{2+}$ moments under higher fields. In the case of $H\parallel ab$, the magnetization increases step-like to 6.6 $μ_{B}$/f.u. with small magnetic hysteresis. A metamagnetic phase was identified with the saturated moments of 4.4 $μ_{B}$/f.u. The metamagnetic transition accompanies with negative in-plane magnetoresistance, reflecting the influence of Eu$^{2+}$ moments ordering on the electrical conduction of FeAs layers. The results were explained in terms of spin-reorientation and spin-reversal based on an $A$-type AFM structure for Eu$^{2+}$ spins. The magnetic phase diagram has been established.
description: 10 pages, 8 figures. accepted for publication in New Journal of Physics as a special issue article
Quantum interferometry using coherent beam stimulated parametric down-conversion
Creators: name: Kolkiran, Aziz
name: Agarwal, G. S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We show how stimulated parametric processes can be employed in experiments on beyond the diffraction limit to overcome the problem of low visibility obtained by using spontaneous down conversion operating in the high gain regime. We further show enhancement of the count rate by several orders when stimulated parametric processes are used. Both the two photon counts and the visibility can be controlled by the phase of the stimulating coherent beam.
description: 7 pages, 4 figures
Strengthened large deviations for rational maps and full shifts, with unified proof
Creators: name: Comman, Henri
Publisher: name: arXiv
Year: 2008
Subjects: subject: Dynamical Systems (math.DS)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 60F10; 37A50

description: For any hyperbolic rational map and any net of Borel probability measures on the space of Borel probability measures on the Julia set, we show that this net satisfies a strong form of the large deviation principle with a rate function given by the entropy map if and only if the large deviation and the pressure functionals coincide. To each such principles corresponds a new expression for the entropy of invariant measures. We give the explicit form of the rate function of the corresponding large deviation principle in the real line for the net of image measures obtained by evaluating the function $\log|T'|$. These results are applied to various examples including those considered in the literature where only upper bounds have been proved. The proof rests on some entropy-approximation property (independent of the net of measures), which in a suitable formulation, is nothing but the hypothesis involving exposed points in Baldi's theorem. In particular, it works verbatim for general dynamical systems. After stating the corresponding general version, as another example we consider the multidimensional full shift for which the above property has been recently proved, and we establish large deviation principles for nets of measures analogous to those of the rational maps case.
description: Last section removed; the proofs of Theorem 3.3 and Corollary 3.4 have been enhanced; others minors changes; published version
Effect of Zn doping on magnetic order and superconductivity in LaFeAsO
Creators: name: Li, Yuke
name: Lin, Xiao
name: Tao, Qian
name: Wang, Cao
name: Zhou, Tong
name: Li, Linjun
name: Wang, Qingbo
name: He, Mi
name: Cao, Guanghan
name: Xu, Zhu'an
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report Zn-doping effect in the parent and F-doped LaFeAsO oxy-arsenides. Slight Zn doping in LaFe$_{1-x}$Zn$_{x}$AsO drastically suppresses the resistivity anomaly around 150 K associated with the antiferromagnetic (AFM) spin density wave (SDW) in the parent compound. The measurements of magnetic susceptibility and thermopower confirm further the effect of Zn doping on AFM order. Meanwhile Zn doping does not affect or even enhances the $T_c$ of LaFe$_{1-x}$Zn$_{x}$AsO$_{0.9}$F$_{0.1}$, in contrast to the effect of Zn doping in high-$T_c$ cuprates. We found that the solubility of Zn content ($x$) is limited to less than 0.1 in both systems and further Zn doping (i.e., $x$ $\geq$ 0.1) causes phase separation. Our study clearly indicates that the non-magnetic impurity of Zn$^{2+}$ ions doped in the Fe$_2$As$_2$ layers affects selectively the AFM order, and superconductivity remains robust against the Zn doping in the F-doped superconductors.
description: 7 figures, 13 pages; revised version with more data
Near-infrared polarization images of the Orion proplyds
Creators: name: Rost, S.
name: Eckart, A.
name: Ott, T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We performed AO-assisted high-resolution imaging polarimetry on selected Orion proplyds close to the Trapezium stars in the J, H, and K bands. Differential polarimetric images of one of the largest and brightest proplyds are interpreted using 3D radiation transfer simulations based on the Monte Carlo method. Although not fully resolvable by ground-based observations, the circumstellar material can be mapped with polarimetry. We present constraints on the disk parameters of the giant proplyd 177-341. We tested whether dust models with different grain size distributions could explain the observed extent of the polarization patterns and find that simple models with larger grains will not reproduce the spectral polarization behavior. The technique of polarimetric differential imaging (PDI) in the NIR provides a good opportunity to study the structure of the Orion proplyds.
description: 10 pages, 11 figures, 4 online figures
Quantum-enhanced atomic gyroscope with tunable precision
Creators: name: Cooling, J. P.
name: Dunningham, J. A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We model a gyroscope that exploits quantum effects in an atomic Bose-Einstein condensate to gain a tunable enhancement in precision. Current inertial navigation systems rely on the Sagnac effect using unentangled photons in fibre-optic systems and there are proposals for improving how the precision scales with the number of particles by using entanglement. Here we exploit a different route based on sharp resonances associated with quantum phase transitions. By adjusting the interaction between the particles and/or the shape of their trapping potential we are able to tune the width of the resonance and hence the precision of the measurement. Here we show how we can use this method to increase the overall sensitivity of a gyroscope by adjusting the system parameters as the measurement proceeds and our knowledge of the rotation improves. We illustrate this with an example where the precision is enhanced by a factor of more than 20 over the case without tuning, after 100 repetitions. Metrology schemes with tunable precision based on quantum phase transitions could offer an important complementary method to other quantum-enhanced measurement and sensing schemes.
description: 10 pages, 4 figures
ศรีรายา:อัตลักษณ์ของชุมชนและมรดกทางวัฒนธรรม
Creators: name: รองศาสตราจารย์ ดร.ศิริวรรณ ศิลาพัชรนันท์
Publisher: name: โรงพิมพ์แห่งจุฬาลงกรณ์มหาวิทยาลัย
Year: 2013
Subjects: อัตลักษณ์,มรดกทางวัฒนธรรม,สังคมพหุวัฒนธรรม,ศรีรายา

description: 62, Academic Journal of Architecture
การกระจายตัวเชิงพื้นที่ของบริษัทสร้างสรรค์ในกรุงเทพมหานคร:กรณีศึกษาบริษัทโฆษณา ออกแบบสถาปัตยกรรมและบริการซอฟท์แวร์
Creators: name: ผู้ช่วยศาสตราจารย์ ดร.อภิวัฒน์ รัตนวราหะและสฤษดิ์ ติยะวงศ์สุวรรณ
Publisher: name: โรงพิมพ์แห่งจุฬาลงกรณ์มหาวิทยาลัย
Year: 2013
Subjects: ธุรกิจสร้างสรรค์,การรวมกลุ่มเชิงพื้นที่,ความประหยัดจากความเป็นเมือง,ความประหยัดจากการกระจุกตัวเชิงที่ตั้ง

description: 62, Academic Journal of Architecture
แนวทางการออกแบบการจัดผังพื้นสำหรับนิทรรศการเพื่อให้เกิดประสิทธิภาพในการค้นหาเป้าหมายในพิพิธภัณฑสถานแห่งชาติ
Creators: name: ดร.ชุมพร มูรพันธุ์
Publisher: name: โรงพิมพ์แห่งจุฬาลงกรณ์มหาวิทยาลัย
Year: 2013
Subjects: พฤติกรรมการค้นหาเป้าหมาย,ประสิทธิภาพการค้นหาเป้าหมาย,ผังพื้น,การออกแบบนิทรรศการในพิพิธภัณฑ์

description: 62, Academic Journal of Architecture
Unified approach to structure factors and neutrino processes in nucleon matter
Creators: name: Lykasov, G. I.
name: Pethick, C. J.
name: Schwenk, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a unified approach to neutrino processes in nucleon matter based on Landau's theory of Fermi liquids that includes one- and two-quasiparticle-quasihole pair states as well as mean-field effects. We show how rates of neutrino processes involving two nucleons may be calculated in terms of the collision integral in the Landau transport equation for quasiparticles. Using a relaxation time approximation, we solve the transport equation for density and spin-density fluctuations and derive a general form for the response functions. We apply our approach to neutral-current processes in neutron matter, where the spin response function is crucial for calculations of neutrino elastic and inelastic scattering, neutrino-pair bremsstrahlung and absorption from strongly-interacting nucleons. We calculate the relaxation rates using modern nuclear interactions and including many-body contributions, and find that rates of neutrino processes are reduced compared with estimates based on the one-pion exchange interaction, which is used in current simulations of core-collapse supernovae.
description: 16 pages, 4 figures; NORDITA-2008-30; published version
Analysis of averaged multichannel delay times
Creators: name: Kelkar, N. G.
name: Nowakowski, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The physical significances and the pros and cons involved in the usage of different time delay formalisms are discussed. The delay time matrix introduced by Eisenbud, where only s-waves participate in a reaction, is in general related to the definition of an angular time delay which is shown not to be equivalent to the so-called phase time delay of Eisenbud and Wigner even for single channel scattering. Whereas the expression due to Smith which is derived from a time delayed radial wave packet is consistent with a lifetime matrix which is Hermitian, this is not true for any Eisenbud-type lifetime matrix which violates time reversal invariance. Extending the angular time delay of Nussenzveig to multiple channels, we show that if one performs an average over the directions and subtracts the forward angle contribution containing an interference of the incident and scattered waves, the multichannel angle dependent average time delay reduces to the one given by Smith. The present work also rectifies a recently misinterpreted misnomer of the relation due to Smith.
description: 15 pages, LaTex
Formation of an ultra-diffuse galaxy in the stellar filaments of NGC3314A: caught in act?
Creators: name: Iodice, Enrichetta
name: La Marca, Antonio
name: Hilker, Michael
name: Cantiello, Michele
name: D'Ago, Giuseppe
name: Gullieuszik, Marco
name: Rejkuba, Marina
name: Arnaboldi, Magda
name: Spavone, Marilena
name: Spiniello, Chiara
name: Forbes, Duncan A.
name: Greggio, Laura
name: Rampazzo, Roberto
name: Mieske, Steffen
name: Paolillo, Maurizio
name: Schipani, Pietro
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The VEGAS imaging survey of the Hydra I cluster reveals an extended network of stellar filaments to the south-west of the spiral galaxy NGC3314A. Within these filaments, at a projected distance of ~40 kpc from the galaxy, we discover an ultra-diffuse galaxy (UDG) with a central surface brightness of $μ_{0,g}\sim26$ mag arcsec$^{-2}$ and effective radius $R_e\sim3.8$ kpc. This UDG, named UDG32, is one of the faintest and most diffuse low-surface brightness galaxies in the Hydra~I cluster. Based on the available data, we cannot exclude that this object is just seen in projection on top of the stellar filaments, thus being instead a foreground or background UDG in the cluster. However, the clear spatial coincidence of UDG32 with the stellar filaments of NGC3314A suggests that it might have formed from the material in the filaments, becoming a detached, gravitationally bound system. In this scenario, the origin of UDG32 depends on the nature of the stellar filaments in NGC3314A, which is still unknown. They could result from ram-pressure stripping or have a tidal origin. In this letter, we focus on the comparison of the observed properties of the stellar filaments and UDG32, and speculate about their possible origin. The relatively red color ($g-r=0.54 \pm 0.14$~mag) of the UDG, similar to that of the disk in NGC3314A, combined with an age older than 1Gyr, and the possible presence of a few compact stellar systems, all point towards a tidal formation scenario inferred for the UDG32.
description: Accepted for publication in Astronomy & Astrophysics Letter
Flavorful $Z^\prime$ signatures at LHC and ILC
Creators: name: Chen, Shao-Long
name: Okada, Nobuchika
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: There are lots of new physics models which predict an extra neutral gauge boson, referred as Z'-boson. In a certain class of these new physics models, the Z'-boson has flavor-dependent couplings with the fermions in the Standard Model (SM). Based on a simple model in which couplings of the SM fermions in the third generation with the Z'-boson are different from those of the corresponding fermions in the first two generations, we study the signatures of Z'-boson at the Large Hadron Collider (LHC) and the International Linear Collider (ILC). We show that at the LHC, the Z'-boson with mass around 1 TeV can be produced through the Drell-Yan processes and its dilepton decay modes provide us clean signatures not only for the resonant production of Z'-boson but also for flavor-dependences of the production cross sections. We also study fermion pair productions at the ILC involving the virtual Z'-boson exchange. Even though the center-of-energy of the ILC is much lower than a Z'-boson mass, the angular distributions and the forward-backward asymmetries of fermion pair productions show not only sizable deviations from the SM predictions but also significant flavor-dependences.
description: 11 pages, 5 figures, some typos corrected, the version to appear in PLB
Antimatter cosmic rays from dark matter annihilation: First results from an N-body experiment
Creators: name: Lavalle, J.
name: Nezri, E.
name: Ling, F. -S.
name: Athanassoula, L.
name: Teyssier, R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: [Abridged]. We take advantage of the galaxy-like 3D dark matter map extracted from the HORIZON Project results to calculate the positron and antiproton fluxes from dark matter annihilation, in a model-independent approach as well as for dark matter particle benchmarks relevant at the LHC scale (from supersymmetric and extra-dimensional theories). Such a study is dedicated to a better estimate of the theoretical uncertainties affecting predictions, while the PAMELA and GLAST satellites are currently taking data which will soon provide better observational constraints. We discuss the predictions of the antiproton and positron fluxes, and of the positron fraction as well, as compared to the current data. We finally discuss the limits of the Nbody framework in describing the dark matter halo of our Galaxy.
description: 19 pages, 9 figures. Backgrounds included and additional comments and figures on the positron fraction. Accepted for publication in PRD
Measurement of Semileptonic B Decays into Orbitally Excited Charmed Mesons
Creators: name: The BABAR Collaboration
name: Aubert, B.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present a study of B decays into semileptonic final states containing charged and neutral $D_1(2420)$ and $D_2^*(2460)$. The analysis is based on a data sample of $208 fb^{-1}$ collected at the $Υ(4S)$ resonance with the BaBar detector at the PEP-II asymmetric-energy $B$ Factory at SLAC. With a simultaneous fit to four different decay chains, the semileptonic branching fractions are extracted from measurements of the mass difference $Δm=m(D**)-m(D)$ distributions. Product branching fractions are determined to be $BR(B^+ -> D_1^0 \ell^+ ν_{\ell}) x BR(D_1^0 -> D*^+ π^-) = (2.97 +/- 0.17 +/- 0.17) x 10^{-3}$, $BR(B^+ -> D_2^{*0} \ell^+ ν_{\ell}) x BR(D_2^{*0} -> D^{(*)+} π^-) = (2.29 +/- 0.23 +/- 0.21) x 10^{-3}$, $BR(B^0 -> D_1^- \ell^+ ν_{\ell}) x BR(D_1^- -> D*^0 π^-) = (2.78 +/- 0.24 +/- 0.25) 10^{-3}$ and $BR(B^0 -> D_2^{*-} \ell^+ ν_{\ell}) x BR(D_2^{*-} -> D^{(*)0} π^-) = (1.77 +/- 0.26 +-/ 0.11) 10^{-3}$. In addition we measure the branching ratio $Γ(D_2^* -> D π^-)/Γ(D_2^* -> D^{(*)} π^-) = 0.62 +/- 0.03 +/- 0.02$.
description: 7 pages, 1 figure v2: synchronized to version published
Elymniini Herrich-Schaffer 1864
Creators: name: Pohl, Greg
name: Anweiler, Gary
name: Schmidt, Christian
name: Kondla, Norbert
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Nymphalidae

description: Elymniini 1211 * R Lethe anthedon (Clark, 1936) ssp. borealis Clark, 1936 E Jul – B – Northern Pearly Eye T: Masters (1971), Grkovich and Pavulaan (2003), Schmidt et al. (2003) L: Pinel (1990), Bird et al. (1995), [Layberry et al. (1998)] C: PMAE, UASM 1212 * R Lethe eurydice (Linnaeus, 1763) L Jun – E Jul – B – Eyed Brown L: Cardé et al. (1970), Bird et al. (1995), Layberry et al. (1998) C: PMAE
description: Published as part of Pohl, Greg, Anweiler, Gary, Schmidt, Christian & Kondla, Norbert, 2010, An annotated list of the Lepidoptera of Alberta, Canada, pp. 1-549 in ZooKeys 38 (38) on page 189, DOI: 10.3897/zookeys.38.383, http://zenodo.org/record/576629
description: {"references": ["Grkovich A, Pavulaan H (2003) Th e case for taxonomic recognition of the taxon Enodia anthedon borealis A. H. Clark (Satyridae). Taxonomic Report 4 (5): 1 - 15.", "Schmidt BC, Macaulay DA, Kondla NG, Lawrie D, Anweiler GG (2003) Additional butterfly records from Alberta, 1999 - 2002. Blue Jay 61: 110 - 124.", "Pinel HW (1990) Northern pearly eye - new for Alberta. Blue Jay 48: 197 - 199.", "Bird CD, Hilchie GJ, Kondla NG, Pike EM, Sperling FAH (1995) Alberta butterflies. The Provincial Museum of Alberta, Edmonton, AB, 349 pp.", "Layberry RA, Hall PW, Lafontaine JD (1998) The butterflies of Canada. NRC Research Press, Canada Institute for Scientific and Technical Information, in association with University of Toronto Press, Toronto, ON, 280 pp.", "Carde RT, Shapiro AM, Clench HK (1970) Sibling species in the eurydice group of Lethe (Lepidoptera: Satyridae). Psyche 1970: 70 - 103."]}
Deep learning based low-dose synchrotron radiation CT reconstruction
Creators: name: Li, Ling
name: Hu, Yu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Image and Video Processing (eess.IV)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Physical sciences

description: Synchrotron radiation sources are widely used in various fields, among which computed tomography (CT) is one of the most important. The amount of effort expended by the operator varies depending on the subject. If the number of angles needed to be used can be greatly reduced under the condition of similar imaging effects, the working time and workload of the experimentalists will be greatly reduced. However, decreasing the sampling angle can produce serious artifacts and blur the details. We try to use a deep learning model which can build high quality reconstruction sparse data sampling from the angle of the image and ResAttUnet are put forward. ResAttUnet is roughly a symmetrical U-shaped network that incorporates similar mechanisms to ResNet and attention. In addition, the mixed precision is adopted to reduce the demand for video memory of the model and training time.
description: 10 pages, 6 figures
การประเมินค่าความส่องสว่างในอาคารพิพิธภัณฑ์ศิลปะไทยร่วมสมัย
Creators: name: รองศาสตราจารย์ พรรณชลัท สุริโยธิน
Publisher: name: โรงพิมพ์แห่งจุฬาลงกรณ์มหาวิทยาลัย
Year: 2013
Subjects: การให้แสงสว่างในหอศิลป์,การจำลองสภาพแสงสว่าง,การออกแบบแสงธรรมชาติ,ค่าความส่องสว่าง

description: 62, Academic Journal of Architecture
Upper bounds for alpha-domination parameters
Creators: name: Gagarin, Andrei
name: Poghosyan, Anush
name: Zverovich, Vadim E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Combinatorics (math.CO)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 05C69 (Primary), 68R10, 68W20, 90B15 (Secondary)

description: In this paper, we provide a new upper bound for the alpha-domination number. This result generalises the well-known Caro-Roditty bound for the domination number of a graph. The same probabilistic construction is used to generalise another well-known upper bound for the classical domination in graphs. We also prove similar upper bounds for the alpha-rate domination number, which combines the concepts of alpha-domination and k-tuple domination.
description: 7 pages; Presented at the 4th East Coast Combinatorial Conference, Antigonish (Nova Scotia, Canada), May 1-2, 2008
An evaluative case study of the program debugging behaviour of the paired Software Development Technician Apprentice in a geographically distributed environment.
Creators: name: Jolugbo, Olajide
Publisher: name: Lancaster University
Year: 2025
Subjects: Distributed Pair Debugging, Debugging Strategies
Cognitive Load Management
Remote Collaboration
Computer Science Education

description: This empirical study investigates the collective efforts of paired novice
 programmers working on rectifying Python code using technology-mediated
 tools. It aims to uncover: 1) the types of errors they encountered; 2) the
 debugging strategies and tactics employed by these apprentice pairs to
 locate and fix bugs within the Python code; 3) insights into how the pairs
 share the cognitive load; 4) the influence and efficacy of technological
 tools in the debugging process; and 5) the challenges faced by the pairs
 while working remotely to identify and resolve bugs, along with the
 underlying reasons for these challenges. It is methodically qualitative in
 nature and adopts a multi-case approach to closely examine each instance
 in its real-life context, utilising various data collection methods such
 as in-depth interviews, participant observations, code analysis, and focus
 groups.

 Furthermore, this study examines 15 dyads as they work collaboratively to
 debug Python code, showing the challenges they confront as well as their
 diverse debugging strategies and tactics. It also demonstrates the
 importance of integrating debugging tools, as well as how dyads
 strategically distribute cognitive tasks. By focusing on the relatively
 unexplored area of distributed pair debugging, this study offers a fresh
 perspective on collaborative problem-solving among novice programmers
 working in remote settings. It notably presents a conceptual framework for
 understanding dyad’s debugging in disparate settings, contributing
 significantly to computing education and integrating technology into
 educational practices.

 However, despite its contributions, the study acknowledges its limitations
 and suggests directions for further research to enhance the
 generalisability and applicability of its conclusions. Ultimately, this
 thesis advances our understanding of the debugging processes of paired
 novice programmers in remote settings, offering empirical insights and
 technical recommendations to improve computing education and practice.
Origin of the reduced exchange bias in epitaxial FeNi(111)/CoO(111) bilayer
Creators: name: Radu, F.
name: Mishra, S. K.
name: Zizak, I.
name: Erko, A. I.
name: Durr, H. A.
name: Eberhardt, W.
name: Nowak, G.
name: Buschhorn, S.
name: Zhernenkov, K.
name: Wolff, M.
name: Zabel, H.
name: Schmitz, D.
name: Schierle, E.
name: Dudzik, E.
name: Feyerherm, R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have employed Soft and Hard X-ray Resonant Magnetic Scattering and Polarised Neutron Diffraction to study the magnetic interface and the bulk antiferromagnetic domain state of the archetypal epitaxial Ni$_{81}$Fe$_{19}$(111)/CoO(111) exchange biased bilayer. The combination of these scattering tools provides unprecedented detailed insights into the still incomplete understanding of some key manifestations of the exchange bias effect. We show that the several orders of magnitude difference between the expected and measured value of exchange bias field is caused by an almost anisotropic in-plane orientation of antiferromagnetic domains. Irreversible changes of their configuration lead to a training effect. This is directly seen as a change in the magnetic half order Bragg peaks after magnetization reversal. A 30 nm size of antiferromagnetic domains is extracted from the width the (1/2 1/2 1/2) antiferromagnetic magnetic peak measured both by neutron and x-ray scattering. A reduced blocking temperature as compared to the measured antiferromagnetic ordering temperature clearly corresponds to the blocking of antiferromagnetic domains. Moreover, an excellent correlation between the size of the antiferromagnetic domains, exchange bias field and frozen-in spin ratio is found, providing a comprehensive understanding of the origin of exchange bias in epitaxial systems.
description: 8 pages, 5 figures, submitted
Standard Model and SU(5) GUT with Local Scale Invariance and the Weylon
Creators: name: Nishino, Hitoshi
name: Rajpoot, Subhash
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Weyl's scale invariance is introduced as an additional local symmetry in the standard model of electroweak interactions. An inevitable consequence is the introduction of general relativity coupled to scalar fields a la Dirac and an additional vector particle we call the Weylon. Once Weyl's scale invariance is broken, the phenomenon (a) generates Newton's gravitational constant G_N and (b) triggers the conventional spontaneous symmetry breaking mechanism that results in masses for all the fermions and bosons. The scale at which Weyl's scale symmetry breaks is of order Planck mass. If right-handed neutrinos are also introduced, their absence at present energy scales is attributed to their mass which is tied to the scale where scale invariance breaks. Some implications of these ideas are noted in grand unification based on the gauge symmetry SU(5).
description: 12 pages, No figures. This paper matches the version published in AIP Conf. Proc. 881: 82-93, 2007
Non-standard approximations of the Ito-map
Creators: name: Friz, Peter
name: Oberhauser, Harald
Publisher: name: arXiv
Year: 2008
Subjects: subject: Probability (math.PR)
subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 60H99; 34K20

description: The Wong-Zakai theorem asserts that ODEs driven by "reasonable" (e.g. piecewise linear) approximations of Brownian motion converge to the corresponding Stratonovich stochastic differential equation. With the aid of rough path analysis, we study "non-reasonable" approximations and go beyond a well-known criterion of [Ikeda--Watanabe, North Holland 1989] in the sense that our result applies to perturbations on all levels, exhibiting additional drift terms involving any iterated Lie brackets of the driving vector fields. In particular, this applies to the approximations by McShane ('72) and Sussmann ('91). Our approach is not restricted to Brownian driving signals. At last, these ideas can be used to prove optimality of certain rough path estimates.
description: 18 pages
Development and Validation of Stability Indicating High-Performance Thin-Layer Chromatography Method for Estimation of Favipiravir by Quality by Design Approach
Creators: name: Bhosale AA *
name: Mali NS
name: Rukhe NB
name: Pawar A
name: Vitukade GA
Publisher: name: Zenodo
Year: 2024

description: The objective of this study was to apply Quality by Design (QBD) concept for development and validation of stability indicating high-performance thin-layer chromatography (HPTLC) method for estimation of Favipiravir in bulk and marketed tablet formulations. Box-Behnken design was applied to optimize chromatographic conditions and to determine their effect on retardation factor (Rf) value. The developed chromatographic method was validated for linearity, specificity, range, accuracy, LOD and LOQ, precision and robustness as per ICH guidelines. This study was carried out by using the mobile phase containing toluene-ethyl acetate-methanol-formic acid in the ratio of (7:2:1:0.5 v/v). Scanning and densitometric analysis were done at 240 nm. The densitogram of favipiravir was obtained at Rf value of 0.49±0.02. The correlation coefficient was found to be 0.9913 in the concentration range of 2000-12000 ng/band. The percentage recovery was found to be between 98.37 – 100.20%. The LOD and LOQ were found be 20.50 ng/band and 62.13 ng/band respectively. For stability study, favipiravir was subjected to acid, base, oxidation, heat and photo-degradation studies. The developed method has advantages in being robust and able to determine the model drugs and degradation products with sensitivity, selectivity using simple mobile phase.

Keywords: Favipiravir, HPTLC, Quality by Design, Box-Behnken design, Stability indicating method, Validation.
Geometric quantization of integrable systems with hyperbolic singularities
Creators: name: Hamilton, Mark D.
name: Miranda, Eva
Publisher: name: arXiv
Year: 2008
Subjects: subject: Symplectic Geometry (math.SG)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 53D50

description: We construct the geometric quantization of a compact surface using a singular real polarization coming from an integrable system. Such a polarization always has singularities, which we assume to be of nondegenerate type. In particular, we compute the effect of hyperbolic singularities, which make an infinite-dimensional contribution to the quantization, thus showing that this quantization depends strongly on polarization.
description: 34 pages, 15 figures. v2: small correction in one result. v3: expository changes. To appear in Annales de l'Institut Fourier
Photoproduction of possible pentaquark states $Λ^0_b(5912)$ and $Λ^0_b(5920)$ in the $γp\to{}Λ_b^{0(*)}B^+$ reactions
Creators: name: Huang, Yin
name: Zhu, Hong Qiang
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this work, we report on a theoretical study of possible pentaquark states $Λ^0_b(5912)$ and $Λ^0_b(5920)$ in the $γp\to{}Λ_b^{0(*)}B^+$ reactions within an effective Lagrangian approach. In addition to the contributions from the $s$-channel nucleon pole and $t$-channel $\bar{B}^{{*}-}$ exchange, the contact term contribution are also included. Our theoretical approach is based on the chiral unitary theory where the $Λ^0_b(5912)$ and $Λ^0_b(5920)$ resonances are dynamically generated. Within the coupling constants of the $Λ^0_b(5912)$ and $Λ^0_b(5920)$ to $\bar{B}p$ and $\bar{B}^{*}p$ channels obtained from chiral unitary theory, the total and differential cross sections of the $γp\to{}Λ_b^{0(*)}B^+$ are evaluated. Our calculation indicates that the cross section for $γp\to{}Λ_b^{0}(5912)B^{+}$ and $γp\to{}Λ_b^{0}(5920)B^{+}$ reactions are of the order of 0.0164 nb and 0.00527 nb,respectively. If measured in future experiments, such as Electron-Ion Collider in China (EicC) or US(US-EIC), the predicted total cross sections and specific features of the angular distributions can be used to test the (molecular) nature of the $Λ^0_b(5912)$ and $Λ^0_b(5920)$ that they may be pentaquark states.
Photovoltage Dynamics of the Hydroxylated Si(111) Surface Investigated by Ultrafast Electron Diffraction
Creators: name: Murdick, Ryan A.
name: Raman, Ramani K.
name: Murooka, Yoshie
name: Ruan, Chong-Yu
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present a novel method to measure transient photovoltage at nanointerfaces using ultrafast electron diffraction. In particular, we report our results on the photoinduced electronic excitations and their ensuing relaxations in a hydroxyl-terminated silicon surface, a standard substrate for fabricating molecular electronics interfaces. The transient surface voltage is determined by observing Coulomb refraction changes induced by the modified space-charge barrier within a selectively probed volume by femtosecond electron pulses. The results are in agreement with ultrafast photoemission studies of surface state charging, suggesting a charge relaxation mechanism closely coupled to the carrier dynamics near the surface that can be described by a drift-diffusion model. This study demonstrates a newly implemented ultrafast diffraction method for investigating interfacial processes, with both charge and structure resolution.
description: 5 pages, 5 figures
Uncertainty inequalities as entanglement criteria for negative partial-transpose states
Creators: name: Nha, Hyunchul
name: Zubairy, M. Suhail
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this Letter, we show that the fulfillment of uncertainty relations is a sufficient criterion for a quantum-mechanically permissible state. We specifically construct two pseudo-spin observables for an arbitrary non-positive Hermitian matrix whose uncertainty relation is violated. This method enables us to systematically derive separability conditions for all negative partial-transpose states in experimentally accessible forms. In particular, generalized entanglement criteria are derived from the Schrodinger-Robertson inequalities for bipartite continuous-variable states.
description: 4 pages, published version with minor changes
Contamination cannot explain the lack of large-scale power in the cosmic microwave background radiation
Creators: name: Bunn, Emory F.
name: Bourdon, Austin
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Several anomalies appear to be present in the large-angle cosmic microwave background (CMB) anisotropy maps of WMAP. One of these is a lack of large-scale power. Because the data otherwise match standard models extremely well, it is natural to consider perturbations of the standard model as possible explanations. We show that, as long as the source of the perturbation is statistically independent of the source of the primary CMB anisotropy, no such model can explain this large-scale power deficit. On the contrary, any such perturbation always reduces the probability of obtaining any given low value of large-scale power. We rigorously prove this result when the lack of large-scale power is quantified with a quadratic statistic, such as the quadrupole moment. When a statistic based on the integrated square of the correlation function is used instead, we present strong numerical evidence in support of the result. The result applies to models in which the geometry of spacetime is perturbed (e.g., an ellipsoidal Universe) as well as explanations involving local contaminants, undiagnosed foregrounds, or systematic errors. Because the large-scale power deficit is arguably the most significant of the observed anomalies, explanations that worsen this discrepancy should be regarded with great skepticism, even if they help in explaining other anomalies such as multipole alignments.
description: 9 pages. Submitted to Phys. Rev. D
On the two-dimensional Boussinesq equations with temperature-dependent thermal and viscosity diffusions in general Sobolev spaces
Creators: name: He, Zihui
name: Liao, Xian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: We study the existence, uniqueness as well as regularity issues for the two-dimensional incompressible Boussinesq equations with temperature-dependent thermal and viscosity diffusion coefficients in general Sobolev spaces. The optimal regularity exponent ranges are considered.