cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Coherent population trapping in a dressed two-level atom via a bichromatic field
Creators: name: Li, Peng
name: Zhang, Qun
name: Ning, Xi-Jing
name: You, J. Q.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Optics (physics.optics)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We show theoretically that by applying a bichromatic electromagnetic field, the dressed states of a monochromatically driven two-level atom can be pumped into a coherent superposition termed as dressed-state coherent population trapping. Such effect can be viewed as a new doorknob to manipulate a two-level system via its control over dressed-state populations. Application of this effect in the precision measurement of Rabi frequency, the unexpected population inversion and lasing without inversion are discussed to demonstrate such controllability.
description: 14 pages, 6 figures
Microglia become hypofunctional and release metalloproteases and tau seeds when phagocytosing live neurons with P301S tau aggregates.
Creators: name: Brelstaff, Jack H
name: Mason, Matthew
name: Katsinelos, Taxiarchis
name: McEwan, William A
name: Ghetti, Bernardino
name: Tolkovsky, Aviva M
name: Spillantini, Maria Grazia
Publisher: name: Apollo - University of Cambridge Repository
Year: 2021

description: [Figure: see text].
Atomic structure of the single step and dynamics of Sn adatoms on the Si(111)-\sqrt{3}\times\sqrt{3}-Sn surface
Creators: name: Zhachuk, R. A.
name: Rogilo, D. I.
name: Petrov, A. S.
name: Sheglov, D. V.
name: Latyshev, A. V.
name: Colonna, S.
name: Ronci, F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The atomic structure of well-ordered single steps on the Si(111)-\sqrt{3}\times\sqrt{3}-Sn surface and the dynamics of Sn adatoms in the vicinity of these steps was studied. The work was performed using low-temperature scanning tunneling microscopy (STM) and ab initio calculations based on the density-functional theory. The STM tip was used to record the tunneling current versus time on top of oscillating adatoms, keeping the feedback loop turned off. The dynamics of adatoms, detected as the telegraph noise present in the tunneling current, was registered near the steps at 80 K. The atomic structure model of the single steps consisting of Sn atomic chains along the steps was developed. This structure leads to the formation of potential double wells near the steps acting as traps for Sn atoms and explains the fluctuating current recorded in these areas.
description: 9 pages, 8 figures
From Shock Breakout to Peak and Beyond: Extensive Panchromatic Observations of the Type Ib Supernova 2008D associated with Swift X-ray Transient 080109
Creators: name: Modjaz, Maryam
name: Li, W.
name: Butler, N.
name: Chornock, R.
name: Perley, D.
name: Blondin, S.
name: Bloom, J. S.
name: Filippenko, A. V.
name: Kirshner, R. P.
name: Kocevski, D.
name: Poznanski, D.
name: Hicken, M.
name: Foley, R. J.
name: Stringfellow, G. S.
name: Berlind, P.
name: Navascues, D. Barrado y
name: Blake, C. H.
name: Bouy, H.
name: Brown, W. R.
name: Challis, P.
name: Chen, H.
name: de Vries, W. H.
name: Dufour, P.
name: Falco, E.
name: Friedman, A.
name: Ganeshalingam, M.
name: Garnavich, P.
name: Holden, B.
name: Illingworth, G.
name: Liebert, J.
name: Marion, G. H.
name: Lee, N.
name: Olivier, S. S.
name: Prochaska, J. X.
name: Silverman, J. M.
name: Smith, N.
name: Starr, D.
name: Steele, T. N.
name: Stockton, A.
name: Williams, G. G.
name: Wood-Vasey, W. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present extensive early photometric (ultraviolet through near-infrared) and spectroscopic (optical and near-infrared) data on supernova (SN) 2008D as well as X-ray data analysis on the associated Swift/X-ray transient (XRT) 080109. Our data span a time range of 5 hours before the detection of the X-ray transient to 150 days after its detection, and detailed analysis allowed us to derive constraints on the nature of the SN and its progenitor; throughout we draw comparisons with results presented in the literature and find several key aspects that differ. We show that the X-ray spectrum of XRT 080109 can be fit equally well by an absorbed power law or a superposition of about equal parts of both power law and blackbody. Our data first established that SN 2008D is a spectroscopically normal SN Ib (i.e., showing conspicuous He lines), and show that SN 2008D had a relatively long rise time of 18 days and a modest optical peak luminosity. The early-time light curves of the SN are dominated by a cooling stellar envelope (for Δt~0.1- 4 day, most pronounced in the blue bands) followed by 56^Ni decay. We construct a reliable measurement of the bolometric output for this stripped-envelope SN, and, combined with estimates of E_K and M_ej from the literature, estimate the stellar radius R_star of its probable Wolf-Rayet progenitor. According to the model of Waxman et al. and of Chevalier & Fransson, we derive R_star^{W07}= 1.2+/-0.7 R_sun and R_star^{CF08}= 12+/-7 R_sun, respectively; the latter being more in line with typical WN stars. Spectra obtained at 3 and 4 months after maximum light show double-peaked oxygen lines that we associate with departures from spherical symmetry, as has been suggested for the inner ejecta of a number of SN Ib cores.
description: Accepted to ApJ, v3 contains more data than v2 and more references, conclusions not significantly changed, 28 pages in emulateapj, 17 figures
Transformation of auto-Bäcklund type for hyperbolic generalization of Burgers equation
Creators: name: Kutafina, Ekaterina V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We consider the hyperbolic generalization of Burgers equation with polynomial source term. The transformation of auto-Bäcklund type was found. Application of the results is shown in the examples, where the pair of two stationary solutions produces kink and bi-kink solutions.
description: 10 pages, 3 figures
Identification of Bottom Contribution in Non-photonic Electron Spectra and $v_2$ at RHIC
Creators: name: Zhang, Yifei
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a study on the spectra for heavy flavor (charm and bottom) decayed electrons in 200 GeV $p+p$ collisions and provide the relative contributions of charm and bottom hadrons from the PYTHIA calculations. The results suggest that the crossing point of the electron spectra from charm and bottom decays is above 7 GeV/$c$ and bottom contribution is not dominant for electron $p_{T}<3$ GeV/$c$. The upper limit of the relative cross section ratio is reported as $σ_{b\bar{b}}/σ_{c\bar{c}}\leq(0.49\pm0.09\pm0.09)%$. We also compare the $v_2$ distribution from simulation to the experimental data in 200 GeV $Au+Au$ collisions and estimate the possible charm $v_2$.
description: 7 pages,4 figures, 23rd Winter Workshop on Nuclear Dynamics
Unstable Disk Galaxies. II. the Origin of Growing and Stationary Modes
Creators: name: Jalali, Mir Abbas
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: I decompose the unstable growing modes of stellar disks to their Fourier components and present the physical mechanism of instabilities in the context of resonances. When the equilibrium distribution function is a non-uniform function of the orbital angular momentum, the capture of stars into the corotation resonance imbalances the disk angular momentum and triggers growing bar and spiral modes. The stellar disk can then recover its angular momentum balance through the response of non-resonant stars. I carry out a complete analysis of orbital structure corresponding to each Fourier component in the radial angle, and present a mathematical condition for the occurrence of van Kampen modes, which constitute a continuous family. I discuss on the discreteness and allowable pattern speeds of unstable modes and argue that the mode growth is saturated due to the resonance overlapping mechanism. An individually growing mode can also be suppressed if the corotation and inner Lindblad resonances coexist and compete to capture a group of stars. Based on this mechanism, I show that self-consistent scale-free disks with a sufficient distribution of non-circular orbits should be stable under perturbations of angular wavenumber $m>1$. I also derive a criterion for the stability of stellar disks against non-axisymmetric excitations.
description: 15 Pages (emulateapj), 7 Figures, Accepted for Publication in The Astrophysical Journal
Quantum Phase Transitions and the Hidden Order in a Two-Chain Extended Boson Hubbard Model at Half-Odd-Integer Fillings
Creators: name: Lee, Yu-Wen
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the phase diagram of two weakly coupled one-dimensional dipolar boson chains at half-odd-integer fillings. We find that the system contains a rich phase diagram. Four different phases are found. They are the Mott insulators, the single-particle resonant superfluid, the paired superfluid, and the bond- or inter-chain density waves. Moreover, the Mott insulating phase can be further classified according to a hidden string order parameter, which is analogous to the one investigated recently in the one-dimensional boson Mott insulator at integer fillings.
description: 7 pages, 2 figures
Particle vibration at the boundary in turbulent shear flow
Creators: name: Jones, David Peter
Publisher: name: University of British Columbia
Year: 2010

description: Observations were made of the vibratory motion of individual gravel particles near the threshold of motion in a flume. Since it is not known what flow-boundary parameters modify the pressure and velocity fluctuations, a phenomenological approach was used. The study focuses on the processes and conditions that result in vibration and on the factors that modify the vibration frequency. Four hypotheses that may provide an explanation for the vibration were investigated: a) mechanical instability of the particles; b) self excitation arising from wake shedding; c) wake interaction or vorticity amplification leading to vibration; d) excitation arising from turbulent bursting. Individual particles were observed to exhibit irregular vibratory motion. Measurements of the vibration period of gravel in water were found to conform to the scaling relationship proposed by Rao, Narasimha and Badri Narayanan (1971) for the period of turbulent bursts in air and water. Measurements taken by Vanoni (1964) and Sutherland (1967) for the motion of sand in water and by Lyles (1970) for sand in air are shown also to conform to this scaling relationship. As flow parameters approach the threshold condition for a particle, the non-dimensional vibration period consistently decreases towards a value of approximately five. This possibly may provide an objective criterion to determine the threshold of motion. On this criterion, there appears to be no basis for differentiating entrainment mechanisms for coarse sand and gravel - at least for normally loose boundaries. The present work supports the modification of Sutherland's entrainment mechanism by Sumer and Oguz (1978): Rather than a transverse vortex whose lower most portion rotates in the same direction as the mean flow, they propose that the vortex rotates counter to the mean flow. This would be consistent with observations obtained in flow visualization studies (Offen and Kline, 1975) and the correspondence found between particle vibration frequency and the burst periodicity found in this work. Particle vibration and entrainment are considered to result from local, temporarily adverse pressure gradients imposed on the wall by high speed fluid sweeps that form transverse vortices as part of the turbulent burst sequence.
Deep Learning Based Hybrid Precoding in Dual-Band Communication Systems
Creators: name: Ismayilov, Rafail
name: Cavalcante, Renato L. G.
name: Stańczak, Sławomir
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: Artificial Intelligence (cs.AI)
subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: We propose a deep learning-based method that uses spatial and temporal information extracted from the sub-6GHz band to predict/track beams in the millimeter-wave (mmWave) band. In more detail, we consider a dual-band communication system operating in both the sub-6GHz and mmWave bands. The objective is to maximize the achievable mutual information in the mmWave band with a hybrid analog/digital architecture where analog precoders (RF precoders) are taken from a finite codebook. Finding a RF precoder using conventional search methods incurs large signalling overhead, and the signalling scales with the number of RF chains and the resolution of the phase shifters. To overcome the issue of large signalling overhead in the mmWave band, the proposed method exploits the spatiotemporal correlation between sub-6GHz and mmWave bands, and it predicts/tracks the RF precoders in the mmWave band from sub-6GHz channel measurements. The proposed method provides a smaller candidate set so that performing a search over that set significantly reduces the signalling overhead compared with conventional search heuristics. Simulations show that the proposed method can provide reasonable achievable rates while significantly reducing the signalling overhead.
Perfect coupling of light to surface plasmons with ultra-narrow linewidths
Creators: name: Sukharev, M.
name: Sievert, P. R.
name: Seideman, T.
name: Ketterson, J. B.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We examine the coupling of electromagnetic waves incident normal to a thin silver film that forms an oscillatory grating embedded between two otherwise uniform, semi-infinite half spaces. Two grating structures are considered, in one of which the mid point of the Ag film remains fixed whereas the thickness varies sinusoidally, while in the other the mid point oscillates sinusoidally whereas the film thicknesses remains fixed. On reducing the light wavelength from the long wavelength limit, we encounter signatures in the transmission, T, and reflection, R, coefficients associated with: i) the short-range surface plasmon mode, ii) the long-range surface plasmon mode, and iii) electromagnetic diffraction tangent to the grating. The first two features can be regarded as generalized (plasmon) Wood's anomalies whereas the third is the first-order conventional (electromagnetic) Wood's anomaly. The energy density at the film surface is enhanced for wavelengths corresponding to these three anomalies, particularly for the long range plasmon mode in thin films. When exciting the silver film with a pair of waves incident from opposite directions, we find that by adjusting the grating oscillation amplitude and fixing the relative phase of the incoming waves to be even or odd, T+R can be made to vanish for one or the other of the plasmon modes; this corresponds to perfect coupling (impedance matching in the language of electrical engineering) between the incoming light and these modes.
description: 13 pages, 5 figures. accepted J. Chem. Phys
Slides for: Reliability Principles: Smart Grid Asset Life Cycle Management
Creators: Alan M Ross
Publisher: name: IEEE
Year: 2021

Slides for the webinar Reliability Principles: Smart Grid Asset Life Cycle Management
For too long, utility, industrial and commercial facilities have depended upon resiliency or aging principles when looking at the life cycle of grid assets. When we view assets, whose reliability and safety depend upon condition data, under the principles of asset reliability, it is clear we need a different approach to testing, maintenance and life cycle management for a grid to be called “Smart”. This presentation looks at grid assets such as transformers, cable systems, breakers, relays and battery systems from a unique perspective; from that of a reliability professional.
Efficient High Resolution Nyquist Rate ADCs Slides
Creators: Maurits Ortmanns
Publisher: name: IEEE
Year: 2021

Webinar Slides
Abstract: High-resolution converters with high efficiency are dominated by noise-shaping and oversampling architectures. In applications, where true Nyquist-rate conversion is needed, neither oversampling nor noise- shaping can though be used. This is because of exactly the concepts allowing them to combine efficiency with high-performance, bring memory into the system and consequently prevent the sample-to-sample operation. This presentation reviews approaches to circumvent this, i.e. to combine Nyquist-rate conversion with high power efficiency by innovative architectural and circuit design with a focus on incremental Delta-Sigma ADCs.

Bio: Maurits Ortmanns (Senior Member, IEEE) received the Dr.Ing. degree from the University of Freiburg, Freiburg im Breisgau, Germany, in 2004. From 2004 to 2005, he was with Sci-Worx GmbH, Hannover, Germany, working in the field of mixed-signal circuits for biomedical implants. In 2006, he joined the University of Freiburg as an Assistant Professor. Since 2008, he has been a Full Professor with the University of Ulm, Ulm, Germany, where he is the director of the Institute of Microelectronics. He has authored the textbook Continuous-Time Sigma–Delta A/D Conversion, authored or coauthored several other book chapters, and over 250 IEEE journal articles and conference papers. He holds several patents. He served as program committee member of  ISSCC, ESSCIRC, DATE and ECCTD, as ISSCC EU regional chair and is currently analog subcom chair at ISSCC. He served as associate editor for TCAS, and as distinguished lecturer for SSCS. His  research interests include mixed-signal integrated circuit design with special emphasis on data converters and biomedical applications.
Hopf Algebra Symmetry and String Theory
Creators: name: Asakawa, Tsuguhiko
name: Mori, Masashi
name: Watamura, Satoshi
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We investigate the Hopf algebra structure in string worldsheet theory and give a unified formulation of the quantization of string and the space-time symmetry. We reformulate the path integral quantization of string as a Drinfeld twist at the worldsheet level. The coboundary relation shows that the Drinfeld twist defines a module algebra which is equivalent to operators with normal ordering. Upon applying the twist, the space-time diffeomorphism is deformed into a twisted Hopf algebra, while the Poincaré symmetry is unchanged. This suggests a characterization of the symmetry: unbroken symmetries are twist invariant Hopf subalgebras, while broken symmetries are realized as twisted ones. We provide arguments that relate this twisted Hopf algebra to symmetries in path integral quantization.
description: 35 pages, no figure, v2: references and comments added, typos corrected, v3: requires PTP style, title changed, final version published in PTP
Revisiting the X-ray Emission of the Asynchronous Polar V1432 Aql
Creators: name: Wang, Qishan
name: Qian, Shengbang
name: Zhu, Liying
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: As the only eclipsing asynchronous polar, V1432 Aql provides an excellent laboratory to study the interaction between the accreted matter and the magnetic field. Here, we report an analysis of the X-ray data from the contemporaneous \nustar\ and \xrt\ observations. The X-ray data present a profile with a low-intensity state for almost half an orbital period, a dip at 0.6 phase, and a peak at 0.75 phase, which suggests that there was only one accretion region during the observation and the claim is supported by the spectral analysis. The comparison with the previous data indicates that the X-ray data have an orbital modulation, as the case in \sax, rather than a spin one observed in \rosat. We attribute the orbit and spin modulations to the different accretion geometries at work. The spectral analysis of the wide-band data presents a significant reflection effect, a commonly observed soft X-ray temperature, and the energy balance in V1432 Aql . Additionally, we obtained a low total accretion rate of 1.3 $\times$ 10$^{-10}$ M$_{\odot}$ yr$^{-1}$ and a high specific accretion rate of 3.8 g cm$^{-2}$ s$^{-1}$ which explains the strong reflection from the surface of the white dwarf. However, due to its complex emission, a more physical understanding of its accretion geometry is still outstanding.
description: arXiv admin note: text overlap with arXiv:2011.13088
Diophantine exponents for mildly restricted approximation
Creators: name: Bugeaud, Yann
name: Kristensen, Simon
Publisher: name: arXiv
Year: 2007
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11J13; 11j82; 11J83

description: We are studying the Diophantine exponent μ_{n,l}$ defined for integers 1 \leq l < n and a vector α\in \mathbb{R}^n by letting μ_{n,l} = \sup{μ\geq 0: 0 < ||x \cdot α|| < H(x)^{-μ} for infinitely many x \in C_{n,l} \cap \mathbb{Z}^n}, where \cdot is the scalar product and || . || denotes the distance to the nearest integer and C_{n,l} is the generalised cone consisting of all vectors with the height attained among the first l coordinates. We show that the exponent takes all values in the interval [l+1, \infty), with the value n attained for almost all α. We calculate the Hausdorff dimension of the set of vectors αwith μ_{n,l} (α) = μfor μ\geq n. Finally, letting w_n denote the exponent obtained by removing the restrictions on x, we show that there are vectors αfor which the gaps in the increasing sequence μ_{n,1} (α) \leq ... \leq μ_{n,n-1} (α) \leq w_n (α) can be chosen to be arbitrary.
description: 20 pages
Vorticity and $Λ$ polarization in the microscopic transport model PACIAE
Creators: name: Lei, Anke
name: Wang, Dujuan
name: zhou, Dai-Mei
name: Sa, Ben-Hao
name: Csernai, Laszlo Pal
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the behavior of four types of vorticities in non-central Au+Au collisions at energies $\sqrt{S_{NN}}$ = 5--200 GeV using a microscopic transport model PACIAE. The results show that the vorticities decay faster at lower energy and smaller impact parameter. The non-monotonic dependence of the initial vorticities on the collision energies is reconfirmed and the turning point is 10-15 GeV for different vorticities. The global $Λ$ polarization at energies $\sqrt{S_{NN}}$ = 7.7--200 GeV is reproduced by introducing an energy density freeze-out criterion.
description: 7 pages, 7 figures, to be published in Pyhysical Review C
Dynamics of Localization Phenomena for Hardcore Bosons in Optical Lattices
Creators: name: Horstmann, Birger
name: Cirac, Juan Ignacio
name: Roscilde, Tommaso
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We investigate the behavior of ultracold bosons in optical lattices with a disorder potential generated via a secondary species frozen in random configurations. The statistics of disorder is associated with the physical state in which the secondary species is prepared. The resulting random potential, albeit displaying algebraic correlations, is found to lead to localization of all single-particle states. We then investigate the real-time dynamics of localization for a hardcore gas of mobile bosons which are brought into sudden interaction with the random potential. Regardless of their initial state and for any disorder strength, the mobile particles are found to reach a steady state characterized by exponentially decaying off-diagonal correlations and by the absence of quasi-condensation; when the mobile particles are initially confined in a tight trap and then released in the disorder potential, their expansion is stopped and the steady state is exponentially localized in real space, clearly revealing Anderson localization.
description: 14 pages, 16 figures; added references, minor revisions; to appear in Phys. Rev. A
Deep Learning Beam Optimization in Millimeter-Wave Communication Systems
Creators: name: Ismayilov, Rafail
name: Cavalcante, Renato L. G.
name: Stańczak, Sławomir
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Theory (cs.IT)
subject: Artificial Intelligence (cs.AI)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: We propose a method that combines fixed point algorithms with a neural network to optimize jointly discrete and continuous variables in millimeter-wave communication systems, so that the users' rates are allocated fairly in a well-defined sense. In more detail, the discrete variables include user-access point assignments and the beam configurations, while the continuous variables refer to the power allocation. The beam configuration is predicted from user-related information using a neural network. Given the predicted beam configuration, a fixed point algorithm allocates power and assigns users to access points so that the users achieve the maximum fraction of their interference-free rates. The proposed method predicts the beam configuration in a "one-shot" manner, which significantly reduces the complexity of the beam search procedure. Moreover, even if the predicted beam configurations are not optimal, the fixed point algorithm still provides the optimal power allocation and user-access point assignments for the given beam configuration.
Logarithmic conformal field theory approach to topologically massive gravity
Creators: name: Myung, Yun Soo
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the topologically massive gravity at the chiral point (chiral gravity) by using the logarithmic conformal field theory. Two new tensor fields of $ψ^{new}$ and $X$ are introduced for a candidate of propagating physical field at the chiral point. However, we show that ($ψ^{new},ψ^L$) form a dipole ghost pair of unphysical fields and $X$ is not a primary. This implies that there is no physically propagating degrees of freedom at the chiral point.
description: 11 pages
Role of the Majorana Fermion and the Edge Mode in Chiral Superfluidity near a p-Wave Feshbach Resonance
Creators: name: Mizushima, T.
name: Ichioka, M.
name: Machida, K.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The visualization of chiral p-wave superfluidity in Fermi gases near p-wave Feshbach resonances is theoretically examined. It is proposed that the superfluidity becomes detectable in the entire BCS-BEC regimes through (i) vortex visualization by the density depletion inside the vortex core and (ii) intrinsic angular momentum in vortex free states. It is revealed that both (i) and (ii) are closely connected with the Majorana zero energy mode of the vortex core and the edge mode, which survive until the strong coupling BCS regime is approached from the weak coupling limit and vanish in the BEC regime.
description: 5 pages, 4 figures, replaced by the version to appear in Phys. Rev. Lett
The stability of calcium glucoheptonate solutions
Creators: name: Suryanarayanan, Rajagopalan
Publisher: name: University of British Columbia
Year: 2010

description: Calcium glucoheptonate is official in the USP XX as Calcium Gluceptate and is described as the calcium salt of D-glycero-D-gulo-heptonic acid which is the a epimer of glucoheptonic acid. It is freely soluble in water. Since late 1976, solutions of calcium glucoheptonate have shown a tendency to precipitate on storage. The problem of precipitation can be due to one or more of the following reasons: (i) change from an unstable to a stable modification (ii) presence of seed crystals (iii) differing proportions of α and β epimers in the calcium glucoheptonate obtained from various sources Calcium glucoheptonate was found to be amorphous while the precipitate was crystalline. Membrane filtration increased the time taken for precipitation to occur while autoclaving resulted in stable solutions. It can be postulated that the majority of seed crystals are excluded by filtration which results in increased stability and autoclaving destroys the seed crystals. When calcium glucoheptonate from different sources was used for the preparation of solutions, the time for precipitation varied with the commercial source (Table 1). The most stable solution was prepared from a salt described as calcium α - β glucoheptonate and the least stable was supplied as Calcium Gluceptate USP.
How Different Text-preprocessing Techniques Using The BERT Model Affect The Gender Profiling of Authors
Creators: name: Alzahrani, Esam
name: Jololian, Leon
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: Forensic author profiling plays an important role in indicating possible profiles for suspects. Among the many automated solutions recently proposed for author profiling, transfer learning outperforms many other state-of-the-art techniques in natural language processing. Nevertheless, the sophisticated technique has yet to be fully exploited for author profiling. At the same time, whereas current methods of author profiling, all largely based on features engineering, have spawned significant variation in each model used, transfer learning usually requires a preprocessed text to be fed into the model. We reviewed multiple references in the literature and determined the most common preprocessing techniques associated with authors' genders profiling. Considering the variations in potential preprocessing techniques, we conducted an experimental study that involved applying five such techniques to measure each technique's effect while using the BERT model, chosen for being one of the most-used stock pretrained models. We used the Hugging face transformer library to implement the code for each preprocessing case. In our five experiments, we found that BERT achieves the best accuracy in predicting the gender of the author when no preprocessing technique is applied. Our best case achieved 86.67% accuracy in predicting the gender of authors.
Experimental and numerical characterization of single-phase pressure drop and heat transfer enhancement in helical corrugated tubes
Creators: name: Cruz, Gonçalo G.
name: Mendes, Miguel A. A.
name: Pereira, Jos M. C.
name: Santos, H.
name: Nikulin, A.
name: Moita, Ana S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The internal flow in corrugated tubes of different helical pitch, covering from the laminar to turbulent regime, was studied in order to characterize the three-dimensional flow and the influence of corrugation geometry on pressure drop and convective heat transfer. With water as working fluid and an imposed wall heat flux, ranging from around 4 to 33 kW/m2, a numerical model was developed with a CFD commercial software, where k-omega SST was used to model turbulence. Experimental tests were performed covering Reynolds numbers in the range from around 300 up to 5000, which allowed to identify the transition region and validate the numerical model. The results show that due to the swirl induced by the corrugation, the critical Reynolds number for the start of transition to turbulent flow is reduced. The thermal performance factor, which quantifies the heat transfer enhancement at the expense of pressure drop, was used to compare the corrugated tubes against the reference case of smooth tube. Based on this, all investigated corrugated geometries performed better than the smooth tube, except for low Reynolds numbers (Re<500) in the laminar regime. Overall, the corrugated tube with the lowest pitch showed a clearly better performance for the intermediate range of Reynolds numbers (1000
description: 15 pages, 15 figures
Economic Analysis of Power Grid Interconnections Among Europe, North-East Asia, and North America With 100% Renewable Energy Generation
Creators: Cong Wu
Xiao-Ping Zhang
and Michael J. H. Sterling
Publisher: name: IEEE
Year: 2021

In this paper, we investigate whether the interconnection of power grids with 100% renewable energy generation can bring greater economic benefits now that the technology exists for high power, long distance Ultra High Voltage Direct Current transmission.
In this paper, we investigate whether the interconnection of power grids with 100% renewable energy generation can bring greater economic benefits now that the technology exists for high power, long distance Ultra High Voltage Direct Current transmission. Based on multi-year historical weather data and demand series, this study compares eight interconnection schemes for three regional grids in Europe, North-East Asia, and North America where there is around 8-hour time difference between any of the two regions. Sensitivity analyses are presented with respect to infrastructure capital cost and different weather year which show that interconnection yields a reduction of approximately 18% in the total annual system cost. The results in this paper also indicate that the regional levelized cost of electricity (LCOE) drops by 31%, 10%, and 10% for Europe, North-East Asia and North America, respectively. It is concluded that there is a strong incentive through both annual cost saving and regional LCOE drop in favour of full long-distance interconnections between the three regions in the context of the international drive towards a net-zero strategy.
การพัฒนาบทเรียนแบบโปรแกรมเรื่องโครงสร้างอะตอมและการจัดเรียงอิเล็กตรอนสำหรับนักเรียนระดับประกาศนียบัตรวิชาชีพ
Creators: name: ยุพดี  กาญจนะ
Publisher: name: วิทยาลัยเทคนิคสตูล
Year: 2011
Subjects: บทเรียนแบบโปรแกรม, ประสิทธิภาพ, โครงสร้างอะตอม, การจัดเรียงอิเล็กตรอน

description: 2, 5, วารสารวิชาการและวิจัย มทร.พระนคร
Notes on multiplicativity of maximal output purity for completely positive qubit maps
Creators: name: Audenaert, Koenraad M. R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A problem in quantum information theory that has received considerable attention in recent years is the question of multiplicativity of the so-called maximal output purity (MOP) of a quantum channel. This quantity is defined as the maximum value of the purity one can get at the output of a channel by varying over all physical input states, when purity is measured by the Schatten $q$-norm, and is denoted by $ν_q$. The multiplicativity problem is the question whether two channels used in parallel have a combined $ν_q$ that is the product of the $ν_q$ of the two channels. A positive answer would imply a number of other additivity results in QIT. Very recently, P. Hayden has found counterexamples for every value of $q>1$. Nevertheless, these counterexamples require that the dimension of these channels increases with $1-q$ and therefore do not rule out multiplicativity for $q$ in intervals $[1,q_0)$ with $q_0$ depending on the channel dimension. I argue that this would be enough to prove additivity of entanglement of formation and of the classical capacity of quantum channels. More importantly, no counterexamples have as yet been found in the important special case where one of the channels is a qubit-channel, i.e. its input states are 2-dimensional. In this paper I focus attention to this qubit case and I rephrase the multiplicativity conjecture in the language of block matrices and prove the conjecture in a number of special cases.
description: Manuscript for a talk presented at the SSPCM07 conference in Myczkowce, Poland, 10/09/2007. 12 pages
Investigating point sources in MWC 758 with SPHERE
Creators: name: Boccaletti, A.
name: Pantin, E.
name: Ménard, F.
name: Galicher, R.
name: Langlois, M.
name: Benisty, M.
name: Gratton, R.
name: Chauvin, G.
name: Ginski, C.
name: Lagrange, A. -M.
name: Zurlo, A.
name: Biller, B.
name: Bonavita, M.
name: Bonnefoy, M.
name: Brown-Sevilla, S.
name: Cantalloube, F.
name: Desidera, S.
name: D'Orazi, V.
name: Feldt, M.
name: Hagelberg, J.
name: Lazzoni, C.
name: Mesa, D.
name: Meyer, M.
name: Perrot, C.
name: Vigan, A.
name: Sauvage, J. -F.
name: Ramos, J.
name: Rousset, G.
name: Magnard, Y.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Context. Spiral arms in protoplanetary disks could be shown to be the manifestation of density waves launched by protoplanets and propagating in the gaseous component of the disk. At least two point sources have been identified in the L band in the MWC 758 system as planetary mass object candidates. Aims. We used VLT/SPHERE to search for counterparts of these candidates in the H and K bands, and to characterize the morphology of the spiral arms . Methods. The data were processed with now-standard techniques in high-contrast imaging to determine the limits of detection, and to compare them to the luminosity derived from L band observations. Results. In considering the evolutionary, atmospheric, and opacity models we were not able to confirm the two former detections of point sources performed in the L band. In addition, the analysis of the spiral arms from a dynamical point of view does not support the hypothesis that these candidates comprise the origin of the spirals. Conclusions. Deeper observations and longer timescales will be required to identify the actual source of the spiral arms in MWC 758.
description: Accepted for publication in Astronomy and Astrophysics
Testing Inverters with Electric Motor Emulators-Slides
Creators: Uday Deshpande
Publisher: name: IEEE
Year: 2021

PELS Webinar Slides
Abstract: In this webinar, the presenter will his experience and thoughts on the use of electric motor emulators for testing and validation of inverters.
The first part of the presentation will cover an overview of typical test and validation elements and steps and some of the trends considering increasing electrification and growth of electric vehicles.
The second part of the presentation will discuss the essential elements of an electric motor emulator, how it can be used for testing an inverter in lieu of a conventional dyno, typical tests that can be done using an emulator test system including performance, durability, environmental, that address functionality and compliance.
The third part of the presentation will cover challenges and considerations that need to kept in mind as people consider using emulator based test systems. We will look at motor models and real-time implementation, considerations to ensure high fidelity representation of motor behavior, means and mechanisms to study faulted behaviors.
Through this webinar, the audiences can expect an in-depth overview of this fast-growing approach to improve test efficiency and effectiveness and spark ideas and discussions to continuously improve design and development cycles.
Slides for: Higher Education Model for Smart Cities
Creators: Deepak Waikar
Publisher: name: IEEE
Year: 2021

Slides for Webinar: Higher Education Model for Smart Cities
Smart cities have been planned by many nations as an integrated part of the globalized world which has been rapidly changing the dynamics of the education system. Would it, then, be sufficient to restructure the curriculum & tinker with the delivery mechanism? OR would it be prudent to holistically reinvent & transform the current education system in line with the aspirations of the stakeholders?  What macro and micro level changes would be required in the current education system if it were to be redesigned for smart cities of the modern globalized world?  In view of such developments, SMART Synergistic education model was conceptualized to catalyze that transformation. The SMART attributes of the proposed model are discussed in this presentation. The proposed SMART attributes are substantially different from commonly used SMART term in management literature.  An idealism of globalized mindset, & localized lifestyles has also been artistically interwoven in the proposed SMART model.
Quantum evolution across singularities
Creators: name: Craps, Ben
name: Evnin, Oleg
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Attempts to consider evolution across space-time singularities often lead to quantum systems with time-dependent Hamiltonians developing an isolated singularity as a function of time. Examples include matrix theory in certain singular time-dependent backgounds and free quantum fields on the two-dimensional compactified Milne universe. Due to the presence of the singularities in the time dependence, the conventional quantum-mechanical evolution is not well-defined for such systems. We propose a natural way, mathematically analogous to renormalization in conventional quantum field theory, to construct unitary quantum evolution across the singularity. We carry out this procedure explicitly for free fields on the compactified Milne universe and compare our results with the matching conditions considered in earlier work (which were based on the covering Minkowski space).
description: revised with an emphasis on local counterterm subtraction rather than analyticity; version to be submitted for publication
title: Es ist, als ob du mich schlügst. Das tragische Spiel um Scham, Schuld und Gewalt in  Mela Hartwigs Das Verbrechen
Creators: name: Box, Marijke
Publisher: name: IZGOnZeit. Onlinezeitschrift des Interdisziplinären Zentrums für Geschlechterforschung (IZG)
Year: 2017

description: IZGOnZeit. Onlinezeitschrift des Interdisziplinären Zentrums für Geschlechterforschung (IZG), IZGOnZeit Nr. 6 (2017)
The Parkes pulsar timing array second data release: Timing analysis
Creators: name: Reardon, D. J.
name: Shannon, R. M.
name: Cameron, A. D.
name: Goncharov, B.
name: Hobbs, G. B.
name: Middleton, H.
name: Shamohammadi, M.
name: Thyagarajan, N.
name: Bailes, M.
name: Bhat, N. D. R.
name: Dai, S.
name: Kerr, M.
name: Manchester, R. N.
name: Russell, C. J.
name: Spiewak, R.
name: Wang, J. B.
name: Zhu, X. J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The main goal of pulsar timing array experiments is to detect correlated signals such as nanohertz-frequency gravitational waves. Pulsar timing data collected in dense monitoring campaigns can also be used to study the stars themselves, their binary companions, and the intervening ionised interstellar medium. Timing observations are extraordinarily sensitive to changes in path length between the pulsar and the Earth, enabling precise measurements of the pulsar positions, distances and velocities, and the shapes of their orbits. Here we present a timing analysis of 25 pulsars observed as part of the Parkes Pulsar Timing Array (PPTA) project over time spans of up to 24 yr. The data are from the second data release of the PPTA, which we have extended by including legacy data. We make the first detection of Shapiro delay in four Southern pulsars (PSRs J1017$-$7156, J1125$-$6014, J1545$-$4550, and J1732$-$5049), and of parallax in six pulsars. The prominent Shapiro delay of PSR J1125$-$6014 implies a neutron star mass of $M_p = 1.5 \pm 0.2 M_\odot$ (68% credibility interval). Measurements of both Shapiro delay and relativistic periastron advance in PSR J1600$-$3053 yield a large but uncertain pulsar mass of $M_p = 2.06^{+0.44}_{-0.41}$ M$_\odot$ (68% credibility interval). We measure the distance to PSR J1909$-$3744 to a precision of 10 lyr, indicating that for gravitational wave periods over a decade, the pulsar provides a coherent baseline for pulsar timing array experiments.
description: 44 pages, 32 figures, 7 tables. Accepted for publication in MNRAS; v2 includes corrected typos in parameter tables and reference added
Battery Safety for Utilities Session 1- Understanding the compliance requirements (Slides)
Creators: Doug Houseman
Publisher: name: IEEE
Year: 2021

If you take the time to do research on stationary batteries, you will find articles on over 100 stationary battery fires that completely destroyed the facilities. Having been involved in the review of 40 of them, there are things that can be done to reduce the possibility of fires.
If you take the time to do research on stationary batteries, you will find articles on over 100 stationary battery fires that completely destroyed the facilities. Having been involved in the review of 40 of them, there are things that can be done to reduce the possibility of fires. IEEE, NFPA and others have created a robust set of compliance standards that can reduce the risk of fire, and create installations that are fairly safe. Lessons learned from these situations can further reduce the danger to fire fighters, workers, and the neighborhood. Each Kilowatt hour stored in the system is approximately 1 kilogram of TNT energy potential, how you design and specify your storage system is the difference in safe that system is.
Breakdown of the initial value formulation of scalar-tensor gravity and its physical meaning
Creators: name: Faraoni, Valerio
name: Lanahan-Tremblay, Nicolas
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We revisit singularities of two distinct kinds in the Cauchy problem of general scalar-tensor theories of gravity (previously discussed in the literature), and of metric and Palatini f(R) gravity, in both their Jordan and Einstein frame representations. Examples and toy models are used to shed light onto the problem and it is shown that, contrary to common lore, the two conformal frames are equivalent with respect to the initial value problem.
description: 14 pages, LaTex, to appear in Phys. Rev. D
Associations among food insecurity, dietary sodium and potassium intake levels, and hypertension: a cross-sectional study based on NHANES 2007-2010 data
Creators: name: Nothwehr, Ann
Publisher: name: Digital Repository at the University of Maryland
Year: 2014
Subjects: subject: Public health
subject: Epidemiology
subject: Nutrition
subject: food security
subject: hypertension
subject: NHANES
subject: potassium
subject: sodium

description: Background: Food insecure persons may have diet patterns that include excessive sodium and inadequate potassium. These patterns contribute to greater risks of hypertension. Objective: Evaluate levels of association among food insecurity, dietary sodium and potassium intake levels and hypertension among NHANES 2007-2010 adult participants. Methods: Compared mean usual sodium and potassium intakes as well as mean usual sodium-potassium ratios for food secure and food insecure subpopulations. Developed regression models to predict intake levels and hypertension risk. Results: Mean usual

sodium intake is not significantly different for food secure and food insecure participants. Mean usual potassium intake is significantly lower and mean usual sodium-potassium ratio is significantly higher for the food insecure subgroup. Controlling for age and household size, food insecure persons are 43% more likely to be hypertensive than food secure persons. Conclusion: Public health measures to decrease cardiovascular disease risk should include interventions designed for this vulnerable subpopulation.