cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Tunable valley filtering in dynamically strained $α$-$\mathcal{T}_3$ lattices
Creators: name: Filusch, Alexander
name: Fehske, Holger
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Mechanical deformations in $α$-$\mathcal{T}_3$ lattices induce local pseudomagnetic fields of opposite directionality for different valleys. When this strain is equipped with a dynamical drive, it generates a complementary valley-asymmetric pseudoelectric field which is expected to accelerate electrons. We propose that by combining these effects by a time-dependent nonuniform strain, tunable valley filtering devices can be engineered that extend beyond the static capabilities. We demonstrate this by implementing an oscillating Gaussian bump centered in a four-terminal Hall bar $α$-$\mathcal{T}_3$ setup and calculating the induced pseudoelectromagnetic fields analytically. Within a recursive Floquet Green-function scheme, we determine the time-averaged transmission and valley polarization, as well as the spatial distributions of the local density of states and current density. As a result of the periodic drive, we detect novel energy regimes with highly valley-polarized transmission, depending on $α$. Analyzing the spatial profiles of the time-averaged local density of states and current density we can relate these regimes to the pseudoelectromagnetic fields in the setup.By means of the driving frequency, we can manipulate the valley-polarized states, which might be advantageous for future device applications.
description: 9 pages, 7 figures, revised version
title: EFFECTS OF CURCUMIN AND FENUGREEK SOLUBLE FIBER SUPPLEMENTS ON SUBMAXIMAL AND MAXIMAL AEROBIC PERFORMANCE INDICES IN UNTRAINED COLLEGE-AGED SUBJECTS
Creators: name: Goh, Jensen
Publisher: name: University of Kentucky Libraries
Year: 2019

description: Submaximal exercise performance is, in part, limited by the accumulation of metabolic byproducts and energy system capacities. Curcumin and the combination of curcumin and fenugreek soluble fiber (CurQfen®) have been shown to increase endogenous antioxidants and metabolic byproduct clearance as well as reduce inflammation and lipid peroxidation, and therefore, may enhance submaximal aerobic thresholds. In addition, there is evidence that the galactomannan component of fenugreek, used to enhance bioavailability of curcumin, may also have potential physiological effects related to the up regulation of free fatty acid oxidation Therefore, the purpose of this study was to examine the effects of curcumin and fenugreek soluble fiber supplementation on the ventilatory threshold (VT), respiratory compensation point (RCP), maximal oxygen consumption (O2 peak), and time to exhaustion (Tlim)derived from a graded exercise test (GXT). Forty-five untrained, college-aged, male (n = 24) and female (n = 21) subjects (mean age ± SD: 21.2 ± 2.5 yr) were randomly assigned to one of three supplementation groups; placebo (PLA, n=13), 500 mg·day-1 CurQfen® (CUR, n=14), or 300 mg·day-1 fenugreek soluble fiber (FEN, n=18). All of the subjects completed a maximal GXT on a cycle ergometer to determine the VT, RCP, O2 peak, and Tlim before (PRE) and after (POST) 28 days of daily supplementation. The VT and RCP were determined from the V-slope method for the ventilation (E)vs. O2 and E vs. CO2, respectively. Separate, one-way ANCOVAs were used to examine the between group differences for adjusted POST VT, RCP, O2 peak, and Tlim values, with the respective PRE test value as the covariate. The adjusted POST VT-O2 for the CUR (mean ± SD= 1.593 ± 0.157 L·min-1) and FEN (1.597 ± 0.157L·min-1) groups were greater than (p= 0.04 and p= 0.03, respectively) the PLA (1.465 ± 0.155L·min-1) group, but the FEN and CUR groups were not different (p = 0.94). The one-way ANCOVAs for RCP (F = 3.177, p = 0.052), O2 peak (F = 0.613, p = 0.547), and Tlim (F = 0.654, p = 0.525) indicated there were no significant differences among groups. These findings suggested that CurQfen® and/or fenugreek soluble fiber may improve submaximal, but not maximal, aerobic performance indices in untrained subjects.
description: Copyright © Jensen Goh Zhong Sheng 2019
Spin-orbital effect on polariton state in traps
Creators: name: Rubo, Yuri G.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: I discuss similitude and differences of spin-orbital effects for electrons in quantum wells with the Rashba coupling and for polaritons in semiconductor microcavities with TE-TM splitting. Contrary to the case of electron, the ground state of polariton in the trap can be non-degenerate and can possess specific polarization structure. For the case of azimuthally symmetric trap and sufficiently strong spin-orbital coupling, the ground state is either radial or azimuthal vortex, depending on the sign of the coupling constant. The effect is strongly enhanced for polaritons trapped in a ring, where even weak TE-TM splitting results in formation of vorticity and definite polarization of the ground state. The Hamiltonian for quasi-1D motion of polaritons in the ring is derived and it is shown the the dispersion of polaritons depend qualitatively on the curvature of the ring.
description: 8 pages, 3 figures. Paper submitted for the special issue of PRB in honor of E. I. Rashba
title: CLINICAL FEATURES OF DUODENAL ULCER DISEASE AND EROSIVE GASTRODUODENITIS IN CHILDREN
Creators: name: Ikhsanov, Sabit D.
name: Sergienko, Diana F.
name: Detochkin, Andrey N.
Publisher: name: Astrakhan State Medical University
Year: 2019

description: Treatment of erosive and ulcerative lesions of the gastroduodenal zone in children is a priority task of modern gastroenterology. Lifestyle changes are associated with transformations in morphogenesis and the nature of the pathological process in the gastroduodenal zone, which leads to a diversification of the clinical picture of the disease. The study proves the transformation of the clinical course of peptic ulcer and erosive gastroduodenitis in children with deviation into asymptomatic and obliterated forms. It has been established that duodenal ulcer disease is significantly more often diagnosed in children living in urban areas. This is due to the availability of highly qualified medical care, the presence of specialized hospitals. Key words: duodenal ulcer disease, erosive gastroduodenitis, age, children, clinical features, pain syndrome.
Global Residues and Two-Loop Hepta-Cuts
Creators: name: Sogaard, Mads
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We examine maximal unitarity in the nonplanar case and derive remarkably compact analytic expressions for coefficients of master integrals with two-loop crossed box topology in massless four-point amplitudes in any gauge theory, thereby providing additional steps towards automated computation of the full amplitude. The coefficients are obtained by assembling residues extracted through integration on linear combinations of higher-dimensional tori encircling global poles of the loop integrand. We recover all salient features of two-loop maximal unitarity, such as the existence of unique projectors for each master integral. Several explicit calculations are provided. We also establish exact equivalence of our results and master integral coefficients recently obtained via integrand-level reduction in any renormalizable gauge theory.
description: 38 pages, v2: minor changes, typos corrected, references added, journal version
Evaluating Impact of Social Media Posts by Executives on Stock Prices
Creators: name: Sarkar, Anubhav
name: Chakraborty, Swagata
name: Ghosh, Sohom
name: Naskar, Sudip Kumar
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Finance (q-fin.ST)
subject: Computation and Language (cs.CL)
subject: Information Retrieval (cs.IR)
subject: Social and Information Networks (cs.SI)
subject: FOS: Economics and business
subject: FOS: Computer and information sciences
subject: I.7

description: Predicting stock market movements has always been of great interest to investors and an active area of research. Research has proven that popularity of products is highly influenced by what people talk about. Social media like Twitter, Reddit have become hotspots of such influences. This paper investigates the impact of social media posts on close price prediction of stocks using Twitter and Reddit posts. Our objective is to integrate sentiment of social media data with historical stock data and study its effect on closing prices using time series models. We carried out rigorous experiments and deep analysis using multiple deep learning based models on different datasets to study the influence of posts by executives and general people on the close price. Experimental results on multiple stocks (Apple and Tesla) and decentralised currencies (Bitcoin and Ethereum) consistently show improvements in prediction on including social media data and greater improvements on including executive posts.
description: Accepted at the 14th meeting of Forum for Information Retrieval Evaluation (FIRE-2022)
Octet Spin Fractions and the Proton Spin Problem
Creators: name: Shanahan, P. E.
name: Thomas, A. W.
name: Tsushima, K.
name: Young, R. D.
name: Myhrer, F.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The relatively small fraction of the spin of the proton carried by its quarks presents a major challenge to our understanding of the strong interaction. Traditional efforts to explore this problem have involved new and imaginative experiments and QCD based studies of the nucleon. We propose a new approach to the problem which exploits recent advances in lattice QCD. In particular, we extract values for the spin carried by the quarks in other members of the baryon octet in order to see whether the suppression observed for the proton is a general property or depends significantly on the baryon structure. We compare these results with the values for the spin fractions calculated within a model that includes the effects of confinement, relativity, gluon exchange currents and the meson cloud required by chiral symmetry, finding a very satisfactory level of agreement given the precision currently attainable.
description: 5 pages, 3 figures
Nitrogen isotopes in AGB carbon stars and presolar SiC grains: a challenge for stellar nucleosynthesis
Creators: name: Hedrosa, R.
name: Abia, C.
name: Busso, M.
name: Cristallo, S.
name: Domínguez, I.
name: Palmerini, S.
name: Plez, B.
name: Straniero, O.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Isotopic ratios of C, N, Si, and trace heavy elements in presolar SiC grains from meteorites provide crucial constraints to nucleosynthesis. A long-debated issue is the origin of the so-called A+B grains, as for them no stellar progenitor has so far been clearly identified on observational grounds. We report the first spectroscopic measurements of 14N/15N ratios in Galactic carbon stars of different spectral types and show that J- and some SC-type stars might produce A+B grains, even for 15N enrichments previously attributed to novae. We also show that most mainstream (MS) grains are compatible with the composition of N-type stars, but might also descend, in some cases, from SC stars. From the theoretical point of view, no astrophysical scenario can explain the C and N isotopic ratios of SC, J and N-type carbon stars together, as well as those of many grains produced by them. This poses urgent questions to stellar physics.
description: 2 figures, 21 pages, Accepted in Astrophysical Journal Letters
Hidden from View: Neutrino Masses, Dark Matter and TeV-Scale Leptogenesis in a Neutrinophilic 2HDM
Creators: name: Chao, Wei
name: Ramsey-Musolf, Michael J.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We consider a simple extension of the Standard Model providing dark matter and a TeV-scale seesaw mechanism that also allows for viable leptogenesis. In addition to the Standard Model degrees of freedom, the model contains a neutrinophilic Higgs doublet, a scalar singlet, and six singlet fermions (including three right-handed Majorana neutrinos) that are charged under a local $U(1)^\prime$ gauge symmetry. We show how the $U(1)^\prime$ charge assignments and the choice of scalar potential can lead to a TeV-scale seesaw mechanism and $\mathcal{O}(1)$ neutrino Yukawa couplings in a straightforward way. While this scenario has all the ingredients one would expect for significant experimental signatures, including several new TeV scale degrees of freedom, we find that most distinctive features associated with neutrino mass generation, leptogenesis and the dark sector are likely to remain inaccessible in the absence of additional lepton flavor symmetries.
description: 23 pages, 5 figures. Minor corrections, reference updated
Interpretation of AMS-02 Results: Correlations among Dark Matter Signals
Creators: name: De Simone, Andrea
name: Riotto, Antonio
name: Xue, Wei
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The AMS-02 collaboration has recently released data on the positron fraction $e^+/(e^-+e^+)$ up to energies of about 350 GeV. If one insists on interpreting the observed excess as a dark matter signal, then we find it is best described by a TeV-scale dark matter annihilating into $τ^+τ^-$, although this situation is already severely constrained by gamma-ray measurements. The annihilation into $μ^+μ^-$ is allowed by gamma-rays more than $τ^+τ^-$, but it gives a poorer fit to \textsc{AMS-02} data. Moreover, since electroweak corrections induce correlations among the fluxes of stable particles from dark matter annihilations, the recent AMS-02 data imply a well-defined prediction for the correlated flux of antiprotons. Under the assumption that their future measurements will not show any antiproton excess above the background, the dark matter interpretation of the positron rise will possibly be ruled out by only making use of data from a single experiment. This work is the first of a program where we emphasize the role of correlations among dark matter signals.
description: 12 pages, 4 figures. Published version
title: COMPARATIVE EVALUATION OF MONOPOLAR AND BIPOLAR TRANSURETHRAL RESECTION OF THE PROSTATE
Creators: name: Nasirov, Parviz R.
Publisher: name: Astrakhan State Medical University
Year: 2019

description: The article discusses the author’s experience with monopolar (M-TURP) and bipolar (B-TURP) transurethral resection (TUR) of the prostate for benign prostatic hyperplasia (BPH) performed in a total of 49 patients, approximately the same number of patients in each group, in three private clinics. Information from modern urological literature on the technical characteristics of operations, indications and complications are given. The main purpose of the article is to give recommendations to general practitioners and novice urologists for adequate preparation of patients with BPH for TUR of prostate surgery, optimization of the choice of endourological instruments and irrigation solutions, taking into account reduction of intraoperative complications. It has been revealed that with a large prostate gland (> 70 g), bipolar resection of the prostate gland is a relatively safe method of resection compared with monopolar resection, taking into account the risk of TUR syndrome. It is confirmed that epidural anesthesia is preferable to spinal one, especially in simultaneous operations, taking into account the control of postoperative pain. Antibacterial treatment 24 hours before surgery reduces the risk of developing postoperative infection in patients with acute urinary retention and / or when handling the Foley catheter in situ. In this study, no significantly higher urethral stricture frequency has been found in the bipolar group. It has also been established that chronic urinary tract infections (chronic epididymitis, chronic prostatitis) in elderly men are not a contraindication for performing surgically “clean” operations in the inguinal-scrotal region. Key words: prostate gland, benign prostatic hyperplasia, monopolar transurethral resection, bipolar transurethral resection, transrectal ultrasound, elderly men, indications and contraindications for surgery, intraoperative complications.
Hybrid Learning of Time-Series Inverse Dynamics Models for Locally Isotropic Robot Motion
Creators: name: Çallar, Tolga-Can
name: Böttger, Sven
Publisher: name: arXiv
Year: 2022
Subjects: subject: Robotics (cs.RO)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Applications of force control and motion planning often rely on an inverse dynamics model to represent the high-dimensional dynamic behavior of robots during motion. The widespread occurrence of low-velocity, small-scale, locally isotropic motion (LIMO) typically complicates the identification of appropriate models due to the exaggeration of dynamic effects and sensory perturbation caused by complex friction and phenomena of hysteresis, e.g., pertaining to joint elasticity. We propose a hybrid model learning base architecture combining a rigid body dynamics model identified by parametric regression and time-series neural network architectures based on multilayer-perceptron, LSTM, and Transformer topologies. Further, we introduce novel joint-wise rotational history encoding, reinforcing temporal information to effectively model dynamic hysteresis. The models are evaluated on a KUKA iiwa 14 during algorithmically generated locally isotropic movements. Together with the rotational encoding, the proposed architectures outperform state-of-the-art baselines by a magnitude of 10$^3$ yielding an RMSE of 0.14 Nm. Leveraging the hybrid structure and time-series encoding capabilities, our approach allows for accurate torque estimation, indicating its applicability in critically force-sensitive applications during motion sequences exceeding the capacity of conventional inverse dynamics models while retaining trainability in face of scarce data and explainability due to the employed physics model prior.
description: Accepted for publication in IEEE Robotics and Automation Letters ( see https://ieeexplore.ieee.org/document/9954138 ). 8 pages, 8 figures
Non-perturbative Renormalization for Improved Staggered Bilinears
Creators: name: Lytle, Andrew T.
name: Sharpe, Stephen R.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We apply non-perturbative renormalization to bilinears composed of improved staggered fermions. We explain how to generalize the method to staggered fermions in a way which is consistent with the lattice symmetries, and introduce a new type of lattice bilinear which transforms covariantly and avoids mixing. We derive the consequences of lattice symmetries for the propagator and vertices. We implement the method numerically for hypercubic-smeared (HYP) and asqtad valence fermion actions, using lattices with asqtad sea quarks generated by the MILC collaboration. We compare the non-perturbative results so obtained to those from perturbation theory, using both scale-independent ratios of bilinears (of which we calculate 26), and the scale-dependent bilinears themselves. Overall, we find that one-loop perturbation theory provides a successful description of the results for HYP-fermions if we allow for a truncation error of roughly the size of the square of the one-loop term (for ratios) or of size O(1) \times α^2 (for the bilinears themselves). Perturbation theory is, however, less successful at describing the non-perturbative asqtad results.
description: 30 pages, 26 figures
Modelling Fast-Alfvén Mode Conversion Using SPARC
Creators: name: Moradi, H
name: Cally, P S
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We successfully utilise the SPARC code to model fast-Alfvén mode conversion in the region $c_A \gg c_S$ via 3-D MHD numerical simulations of helioseismic waves within constant inclined magnetic field configurations. This was achieved only after empirically modifying the background density and gravitational stratifications in the upper layers of our computational box, as opposed to imposing a traditional Lorentz Force limiter, to ensure a manageable timestep. We found that the latter approach inhibits the fast-Alfvén mode conversion process by severely damping the magnetic flux above the surface.
description: Proceedings of GONG 2012 / LWS/SDO-5 / SOHO 27 (Eclipse on the Coral Sea: Cycle 24 Ascending) Conference, November 12 -16, 2012, Palm Cove, Australia
Synaptic MIS Silicon Nitride Resistance Switching Memory Cells on SOI Substrate
Creators: name: Mavropoulis, AE
name: Vasileiadis, N
name: Normand, P
name: Ioannou-Sougleridis, V
name: Tsakalos, K
name: Sirakoulis, G Ch
name: Dimitrakis, P
Publisher: name: arXiv
Year: 2025
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: In this work, the comparison of resistive memory MIS single-cells without selector (1R), having silicon nitride as switching dielectric, fabricated on SOI and bulk Si wafers is demonstrated. Comprehensive experimental investigations reveal the advantage of SOI substrate over bulk Si in terms of cycling endurance, cell-to-cell variability, retention and data loss rate.
Reversals of Gnevyshev-Ohl rule
Creators: name: Tlatov, Andrey G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: This paper considers the changes of average number of sunspots groups per day, aggregated by activity cycles Gn within the period since 1610 till present time. The relation of parameter Gn of the preceding and the following activity cycles has a long-term variation with the period of about 20 activity cycles. There is a positive correlation between the parameter Gn in the current cycle and analogous parameter in the following cycle Gn+1. For cycles N 10-21 for a pair of even and odd cycles the relation of parameter Gn corresponds to Gnevyshev-Ohl rule Godd/Geven>1. But in previous epochs the odd cycles could be less than the preceding even cycles, and it only proves the reversal of Gnevyshev-Ohl rule.
description: 11 pages, 1 table, 4 figures
title: THE EFFECTIVENESS OF MONOTHERAPY AND EARLY POLYTHERAPY IN FOCAL EPILEPSY WITH THE PHENOMENON OF SECONDARY BILATERAL SYNCHRONY ON THE ELECTROENCEPHALOGRAM
Creators: name: Yamin, Maksim A.
name: Chernikova, Irina V.
Publisher: name: Astrakhan State Medical University
Year: 2019

description: The emergence of secondary bilateral synchrony phenomenon on the electroencephalogram in focal epilepsy is associated with a worsening of the course of epilepsy and features in the selection of anti-epileptic drugs. There are very few works that study the effectiveness of anti-epileptic drugs in focal epilepsy with the phenomenon of secondary bilateral synchrony on the electroencephalogram, in both domestic and foreign sources. Studying the effectiveness of monotherapy and early polytherapy can improve the prognosis for achieving remission for this group of difficult patients. Key words: phenomenon of secondary bilateral synchrony, monotherapy, polytherapy.
Dusicyon australis
Creators: name: W. Christopher Wozencraft
Publisher: name: Zenodo
Year: 1993
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Mammalia
Carnivora
Canidae
Dusicyon
Dusicyon australis

description: Dusicyon australis (Kerr, 1792). In Linnaeus, Anim. Kingdom, p. 144. TYPE LOCALITY: "America and Falkland islands." DISTRIBUTION: Falkland Islands. STATUS: IUCN - Extinct. SYNONYMS: antarcticus Bechstein, 1799; darwini Thomas, 1914. COMMENTS: Placed in Dusicyon by Cabrera (1931) and Berta (1987, 1988), and considered as a subgenus separate from other "foxes" (i.e., culpaeus, griseus, gymnocercus, and sechurae) by Langguth (1975) and Van Gelder (1978).
description: Published as part of W. Christopher Wozencraft, 1993, Order Carnivora, pp. 279-348 in Mammal Species of the World (2 nd Edition), Washington and London :Smithsonian Institution Press on page 283, DOI: 10.5281/zenodo.7359191
description: {"references": ["Cabrera, A. 1931. On some South American canine genera. Journal of Mammalogy, 12: 54 - 67.", "Berta, A. 1987. Origin, diversification, and zoogeography of the South American Canidae. Pp. 455 - 471, in Studies in Neotropical Mammalogy: Essays in honor of Philip Hershkovitz (B. D. Patterson and R. M. Timm, eds.). Fieldiana: Zoology, n. s., 39 (1382): 1 - 506.", "Berta, A. 1988. Quaternary evolution and biogeography of the large South American Canidae (Mammalia: Carnivora). University of California Publications, Geological Sciences, 132: 1 - 149.", "Langguth, A. 1975. Ecology and evolution in the South American canids. Pp. 192 - 206, in The wild canids: Their systematics, behavioral ecology, and evolution (M. W. Fox, ed.). Van Nostrand Reinhold Company, New York, NY, 508 pp.", "Van Gelder, R. G. 1978. A review of canid classification. American Museum Novitates, 2646: 1 - 10."]}
Exact synthesis of multiqubit Clifford+T circuits
Creators: name: Giles, Brett
name: Selinger, Peter
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Emerging Technologies (cs.ET)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We prove that a unitary matrix has an exact representation over the Clifford+T gate set with local ancillas if and only if its entries are in the ring Z[1/sqrt(2),i]. Moreover, we show that one ancilla always suffices. These facts were conjectured by Kliuchnikov, Maslov, and Mosca. We obtain an algorithm for synthesizing a exact Clifford+T circuit from any such n-qubit operator. We also characterize the Clifford+T operators that can be represented without ancillas.
description: 7 pages
Searching for minicharged particles via birefringence, dichroism and Raman spectroscopy of the vacuum polarized by a high-intensity laser wave
Creators: name: Villalba-Chávez, S.
name: Müller, C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Absorption and dispersion of probe photons in the field of a high-intensity circularly polarized laser wave are investigated. The optical theorem is applied for determining the absorption coefficients in terms of the imaginary part of the vacuum polarization tensor. Compact expressions for the vacuum refraction indices and the photon absorption coefficients are obtained in various asymptotic regimes of interest. The outcomes of this analysis reveal that, far from the region relatively close to the threshold of the two-photon reaction, the birefringence and dichroism of the vacuum are small and, in some cases, strongly suppressed. On the contrary, in a vicinity of the region in which the photo-production of a pair occurs, these optical properties are manifest with lasers of moderate intensities. We take advantage of such a property in the search of minicharged particles by considering high-precision polarimetric experiments. In addition, Raman-like electromagnetic waves resulting from the inelastic part of the vacuum polarization tensor are suggested as an alternative form for finding exclusion limits on these hypothetical charge carriers. The envisaged parameters of upcoming high-intensity laser facilities are used for establishing upper bounds on the minicharged particles.
description: 21 pages, 6 figures
Negative eigenvalues of partial transposition of arbitrary bipartite states
Creators: name: Rana, Swapan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The partial transposition of a two-qubit state has at most one negative eigenvalue and all the eigenvalues lie in [-1/2,1]. In this Brief Report, we extend this result by Sanpera et al. [A. Sanpera, R. Tarrach and G. Vidal, Phys. Rev. A 58, 826 (1998)] to arbitrary bipartite states. We show that partial transposition of an $m\otimes n$ state can not have more than (m-1)(n-1) number of negative eigenvalues. Low-dimensional states have been studied to show the tightness of this result and explicit examples have been provided for $mn\le 9$. It is also shown that all the eigenvalues of partial transposition lie within [-1/2,1]. Some possible applications are also discussed.
description: 4 pages, 2 figures
Finite BRST Transformations for the Bagger-Lambert-Gustavasson Theory
Creators: name: Faizal, Mir
name: Mandal, Bhabani P
name: Upadhyay, Sudhaker
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we analyse the Bagger-Lambert-Gustavsson (BLG) theory in $\mathcal{N} =1$ superspace. Furthermore, we will construct the BRST transformations for this theory. These BRST transformations will be integrated out to obtain the finite field dependent version of BRST (FFBRST) transformations. We will also analyse the effect of the FFBRST transformations on the effective action. We will thus show that the FFBRST transformations can be used to relate generating functionals of the BLG theory in two different gauges.
description: 11 pages, 0 figures, accepted for publication in Phys. Lett. B
EXPLORING THE ROLE OF PERCEIVED RETURNS IN POSTGRADUATE ENROLLMENT: A COMPARATIVE STUDY ACROSS SELECTED UNIVERSITIES IN KENYA
Creators: name: Ngugi, Prof. Samuel Mwangi
name: Kimani, Dr. Jane Njeri
name: Mugo, Dr. Grace Wambui
Publisher: name: ZAP journals
Year: 2023
Subjects: Perceived returns
Private demand
Postgraduate studies
Kenyan universities

description: In the face of a consistent surge in private interest in postgraduate education within Kenyan universities, recent trends indicate a decline in actual postgraduate enrollment. This decline poses potential challenges to the attainment of university objectives and the realization of Kenya's Vision 2030. Extensive literature review highlights various factors influencing the decision to pursue postgraduate studies, with perceived returns being a significant determinant. This study aimed to assess the impact of perceived returns on private demand for postgraduate studies across selected universities in Kenya. Employing an explanatory sequential mixed methods design, the research utilized both quantitative and qualitative approaches to comprehensively explore the effects of perceived returns on private demand for postgraduate studies. The target population encompassed all 60,515 students enrolled in Master's and PhD programs across public and private chartered universities in Kenya during the study period. Through systematic random sampling, 395 Master's and PhD students were selected from a purposefully chosen pool of four public chartered universities and three private chartered universities. Data collection involved questionnaires and interviews, with quantitative data analyzed using descriptive and inferential statistics, and qualitative data subjected to thematic and content analysis. The study revealed that perceived returns, indicated by a regression coefficient of B = .57 and a probability level of p = .004 < .05 (at a significance level of p < .05), emerged as a significant predictor of private demand for postgraduate studies. These findings illuminate the influence of perceived returns on private demand for postgraduate studies, providing valuable insights for policymakers and university institutions to align programs with the evolving needs of prospective postgraduate students and the labor market. The study recommends collaborative efforts between universities and employers, both from the private and public sectors, to enhance the provision of accurate information, training, and employment opportunities for postgraduate students
Influence of density and viscosity on deformation, breakage, and coalescence of bubbles in turbulence
Creators: name: Roccon, Alessio
Publisher: name: figshare
Year: 2023
Subjects: Fluid mechanics and thermal engineering not elsewhere classified

description: Data to reproduce the plot reported in "Influence of density and viscosity on deformation, breakage, and coalescence of bubbles in turbulence".
Lycaon Brookes 1827
Creators: name: W. Christopher Wozencraft
Publisher: name: Zenodo
Year: 1993
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Mammalia
Carnivora
Canidae
Lycaon

description: Lycaon Brookes, 1827. In Griffith et al., Anim. Kingdom, 5:151. TYPE SPECIES: Lycaon tricolor Brookes, 1827 (= Hyaena pietà Temminck, 1820) by monotypy (Melville and Smith, 1987). COMMENTS: Placed in Simocyoninae Dawkins, 1868, by Simpson (1945) and Stains (1975).
description: Published as part of W. Christopher Wozencraft, 1993, Order Carnivora, pp. 279-348 in Mammal Species of the World (2 nd Edition), Washington and London :Smithsonian Institution Press on page 283, DOI: 10.5281/zenodo.7359191
description: {"references": ["Melville, R. V., and J. D. D. Smith (eds.). 1987. Official lists and indexes of names and works in zoology. International Commission on Zoological Nomenclature, 366 pp.", "Dawkins, W. B. 1868. Fossil animals and geology of Attica, by Albert Gaudry. (Critical summary). Quarterly Journal of the Geological Society of London, 24: pt. 2, translations & notices, pp. 1 - 7.", "Simpson, G. G. 1945. The principles of classification and a classification of mammals. Bulletin of the American Museum of Natural History, 85: 1 - 350.", "Stains, H. J. 1975. Distribution and taxonomy of the Canidae, Pp. 3 - 26, in The wild canids: Their systematics, behavorial ecology and evolution (M. W. Fox, ed.). Van Nostrand Reinhold Company, New York, NY, 508 pp."]}
LAS LETRAS DE TANGO Y OTROS TEXTOS LUNFARDOS: PRESERVACIÓN Y ESTUDIO DE UN PATRIMONIO EN RIESGO
Creators: name: Conde, Oscar
Publisher: name: Zenodo
Year: 2023
Subjects: Letras de tango
Literatura lunfardesca
Literatura marginalizada
Patrimonio cultural

description: Este trabajo se propone ofrecer un panorama general acerca de las dificultades que se presentan actualmente para el estudio de la cancionística tanguera y de un gigantesco y casi desconocido corpus de textos poéticos, dramáticos, narrativos, humorísticos y periodísticos, originado en la década de 1870, y que desde la década de 1960 se agrupan bajo el rótulo de literatura lunfarda. Se mencionan aquí cuáles son los principales repositorios de partituras y qué otras fuentes complementarias sería necesario consultar para realizar un thesaurus de todas las letras de tangos y "paratangos" desde el origen del género hasta el presente. Asimismo, se da cuenta de quiénes son los principales autores de la literatura lunfarda y las publicaciones periódicas que habría que relevar para recopilar su producción, en vistas de la puesta en práctica de un programa para reeditar en ediciones críticas o anotadas todas estos tesoros ignorados.
Further Studies of Higgs Properties at An ILC $γγ$ Collider
Creators: name: He, Xiao-Gang
name: Li, Siao-Fong
name: Lin, Hsiu-Hsien
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Recently the ATLAS and CMS experiments at the LHC have found a Higgs like boson $h$ with a mass around 125 GeV from several decay modes. The decay mode $h \to γγ$ is one of the most important modes in studying whether $h$ is actually the standard model (SM) Higgs boson. Current data indicate that $h\to γγ$ has a branching ratio larger than the SM prediction for $h$ being identified as the SM Higgs boson. To decide whether the $h$ discovered at the LHC is the SM Higgs boson, more data are needed. We study how $γγ$ collider can help to provide some of the most important information about the Higgs boson properties. We show that a $γγ$ collider can easily verify whether the enhanced $h \to γγ$ observed at the LHC hold. Different models can be tested by studying Higgs boson decay to $γZ$. Studying angular distribution of the $γγ$ through on-shell production of $h$ and its subsequent decays into a $γγ$ pair can decide whether the Higgs like boson $h$ at the LHC is a spin-0 or a spin-2 boson.
description: RevTex 9 pages with 4 figures
Hints of an axion-like particle mixing in the GeV gamma-ray blazar data?
Creators: name: Mena, Olga
name: Razzaque, Soebur
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Axion-Like Particles (ALPs), if exist in nature, are expected to mix with photons in the presence of an external magnetic field. The energy range of photons which undergo strong mixing with ALPs depends on the ALP mass, on its coupling with photons as well as on the external magnetic field and particle density configurations. Recent observations of blazars by the Fermi Gamma-Ray Space Telescope in the 0.1-300 GeV energy range show a break in their spectra in the 1-10 GeV range. We have modeled this spectral feature for the flat-spectrum radio quasar 3C454.3 during its November 2010 outburst, assuming that a significant fraction of the gamma rays convert to ALPs in the large scale jet of this blazar. Using theoretically motivated models for the magnetic field and particle density configurations in the kiloparsec scale jet, outside the broad-line region, we find an ALP mass $m_a\sim (1-3)\cdot 10^{-7}$ eV and coupling $g_{aγ} \sim (1-3)\cdot 10^{-10}$ GeV$^{-1}$ after performing an illustrative statistical analysis of spectral data in four different epochs of emission. The precise values of $m_a$ and $g_{aγ}$ depend weakly on the assumed particle density configuration and are consistent with the current experimental bounds on these quantities. We apply this method and ALP parameters found from fitting 3C454.3 data to another flat-spectrum radio quasar PKS1222+216 (4C+21.35) data up to 400 GeV, as a consistency check, and found good fit. We find that the ALP-photon mixing effect on the GeV spectra may not be washed out for any reasonable estimate of the magnetic field in the intergalactic media.
description: 12 pages, 3 figures. Added axion fit to PKS1222+216 data, discussion and 1 new figure. Results and conclusions are unchanged. Accepted for publication in JCAP
On Minimizing Data-read and Download for Storage-Node Recovery
Creators: name: Shah, Nihar B.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We consider the problem of efficient recovery of the data stored in any individual node of a distributed storage system, from the rest of the nodes. Applications include handling failures and degraded reads. We measure efficiency in terms of the amount of data-read and the download required. To minimize the download, we focus on the minimum bandwidth setting of the 'regenerating codes' model for distributed storage. Under this model, the system has a total of n nodes, and the data stored in any node must be (efficiently) recoverable from any d of the other (n-1) nodes. Lower bounds on the two metrics under this model were derived previously; it has also been shown that these bounds are achievable for the amount of data-read and download when d=n-1, and for the amount of download alone when d
description: IEEE Communications Letters
Exotic properties of N^*(1895) and its impact on photoproduction of light hyperons
Creators: name: Khemchandani, K. P.
name: Torres, A. Martinez
name: Kim, Sang-Ho
name: Nam, Seung-il
name: Hosaka, A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: In this work, we outline the findings of our recent study of the properties of $N^*(1895)$ and its consequential impacts on the cross sections of the photoproduction of $Λ(1405)$. Further, we discuss the possibility of the existence of an isovector state, with the mass similar to $Λ(1405)$, which we refer to as $Σ(1400)$. With the idea of motivating experimental investigations of $Σ(1400)$, we have studied its photoproduction process and determined the respective cross sections and polarization observables. We have studied also the coupling of $N^*(1895)$ to $KΣ(1400)$ and found that it gives an important contribution to the cross sections near the threshold. In the process, we have determined the branching ratios of the decay of $N^*(1895)$, to the final states involving $Λ(1405)$ and $Σ(1400)$, to be in the range of 6-7 MeV. Our findings can motivate consideration of alternative processes in partial wave analyses of experimental data, when studying the properties of $N^*(1895)$.
description: Proceedings for the 4th Jagiellonian Symposium on Advances in Particle Physics and Medicine, organised by the Jagiellonian University in Krakow, with the address and acknowledgments updated for one of the authors
Pattern recognition of $^{136}$Xe double beta decay events and background discrimination in a high pressure Xenon TPC
Creators: name: Cebrian, S
name: Dafni, T
name: Gomez, H
name: Herrera, D C
name: Iguaz, F J
name: Irastorza, I G
name: Luzon, G
name: Segui, L
name: Tomas, A
Publisher: name: arXiv
Year: 2013
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: High pressure gas detectors offer advantages for the detection of rare events, where background reduction is crucial. For the neutrinoless double beta decay of 136Xe a high pressure xenon gas Time Projection Chamber (TPC) combines a good energy resolution and a detailed topological information of each event. The ionization topology of the double beta decay event of 136Xe in gaseous xenon has a characteristic shape defined by the two straggling electron tracks ending up in two higher ionization charge density blobs. With a properly pixelized readout, this topological information is invaluable to perform powerful background discrimination. In this study we carry out detailed simulations of the signal topology, as well as the competing topologies from gamma events that typically compose the background at these energies. We define observables based on graph theory concepts and develop automated discrimination algorithms which reduce the background level in around three orders of magnitude while keeping signal efficiency of 40%. This result supports the competitiveness of current or future double beta experiments based on gas TPCs, like the Neutrino Xenon TPC (NEXT) currently under construction in the Laboratorio Subterraneo de Canfranc (LSC).
description: 26 pages, 9 figures, accepted for publication in Journal of Physics G
The Role of Tunneling Oxide in the Low Frequency Noise of Multi-level Silicon Nitride ReRAMs
Creators: name: Vasileiadis, Nikolaos
name: Mavropoulis, Alexandros
name: Theodorou, Christoforos
name: Dimitrakis, Panagiotis
Publisher: name: arXiv
Year: 2025
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: This research explores the characteristics of two CMOS-compatible RRAM cells utilizing silicon nitride as the switching material. By employing SET/RESET pulse sequences, the study successfully attains four distinct and stable resistance states. To gain deeper insights, a Low-Frequency Noise (LFN) statistical analysis is conducted to investigate the role of a tunneling oxide between the bottom electrode and SiNx at various resistance levels. The findings from the LFN measurements strongly suggest that the multilevel high resistance switching primarily arises from variations in the number of nitrogen vacancies, which in turn modulate the conductivity of conductive filaments (CF). Notably, this modulation does not compromise the quality of the filament's surrounding interface. This research sheds light on the underlying mechanisms of RRAM cells and their potential for advanced memory applications.
Dynamic Implicit 3D Adaptive Mesh Refinement for Non-Equilibrium Radiation Diffusion
Creators: name: Philip, Bobby
name: Wang, Zhen
name: Berrill, Mark
name: Rodriguez, Manuel Rodriguez
name: Pernice, Michael
Publisher: name: arXiv
Year: 2013
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: The time dependent non-equilibrium radiation diffusion equations are important for solving the transport of energy through radiation in optically thick regimes and find applications in several fields including astrophysics and inertial confinement fusion. The associated initial boundary value problems that are encountered often exhibit a wide range of scales in space and time and are extremely challenging to solve. To efficiently and accurately simulate these systems we describe our research on combining techniques that will also find use more broadly for long term time integration of nonlinear multiphysics systems: implicit time integration for efficient long term time integration of stiff multiphysics systems, local control theory based step size control to minimize the required global number of time steps while controlling accuracy, dynamic 3D adaptive mesh refinement (AMR) to minimize memory and computational costs, Jacobian Free Newton-Krylov methods on AMR grids for efficient nonlinear solution, and optimal multilevel preconditioner components that provide level independent solver convergence.
AtlantECO deliverable D5.2 Report on the All-Atlantic interactome
Creators: name: Chaffron, Samuel
name: Eveillard, Damien
name: Gaudin, Marinna
name: Regimbeau, Antoine
Publisher: name: Zenodo
Year: 2023

description: The main goals of WP5 for Advances in Systems Ecology are to develop cutting-edge network analysis methods, to define an all-Atlantic interactome and ecological niches, and to provide indicators of ecosystem stability and sensitivity to environmental stressors and drivers. The main goal of D5.2, associated with Task 5.2, was to deliver a report on the all-Atlantic interactome by constructing cross-kingdom interaction networks for marine microbiome and plastisphere communities. In this task, we examined the (functional) community organisation of microbiomes and the plastisphere at the scale of the global ocean, using metabarcodes, metagenomes, and metatranscriptomes, and specific traits such as genome size and metabolic potential. In particular, we resolved the global-ocean cross-kingdom interactome of viruses, prokaryotes, and eukaryotes, that is, the viral-host interactome, a crucial regulator of carbon fluxes and plankton community dynamics. We also investigated the diversity and community structure in the North Pacific gyre and the Mediterranean Sea to reveal a niche partitioning of plastics-associated microbial communities. In addition, we leveraged metagenomes and metatranscriptomes into a computational workflow to reconstruct the community metabolic landscape and phenotypes of global ocean microbiomes and demonstrate how they can be used to estimate ecosystem-scale marine biogeochemistry. Finally, we also developed a computational framework, integrating metagenomic and metatranscriptomic information at the genome-scale through ecological and metabolic modelling to improve our functional and mechanistic understanding of microbial interactions driving ecosystem functions in situ.