cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Design and Analysis of Optimized Portfolios for Selected Sectors of the Indian Stock Market
Creators: name: Sen, Jaydip
name: Dutta, Abhishek
Publisher: name: arXiv
Year: 2022
Subjects: subject: Portfolio Management (q-fin.PM)
subject: FOS: Economics and business

description: Portfolio optimization is a challenging problem that has attracted considerable attention and effort from researchers. The optimization of stock portfolios is a particularly hard problem since the stock prices are volatile and estimation of their future volatilities and values, in most cases, is very difficult, if not impossible. This work uses three ratios, the Sharpe ratio, the Sortino ratio, and the Calmar ratio, for designing the mean-variance optimized portfolios for six important sectors listed in the National Stock Exchange (NSE) of India. Three portfolios are designed for each sector maximizing the ratios based on the historical prices of the ten most important stocks of each sector from Jan 1, 2017, to Dec 31, 2020. The evaluation of the portfolios is done based on their cumulative returns over the test period from Jan 1, 2021, to Dec 31, 2021. The ratio that yields the maximum cumulative returns for both the training and the test periods for the majority of the sectors is identified. The sectors that exhibit the maximum cumulative returns for the same ratio are also identified. The results provide useful insights for investors in the stock market in making their investment decisions based on the current return and risks associated with the six sectors and their stocks.
description: This is the accepted version of the paper at the 2022 International Conference on Decision Aid Sciences and Applications (DASA'22) which was organized during March 23-25, 2022, Chiangrai, Thailand. The paper is 7 pages long, and it contains 13 tables and 18 figures
Effect of Earth-Moon's gravity on TianQin's range acceleration noise. II. Impact of orbit selection
Creators: name: Luo, Chengjian
name: Zhang, Xuefeng
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The paper is a sequel to our previous work (Zhang et al. Phys. Rev. D 103, 062001 (2021)). For proposed geocentric space-based gravitational wave detectors such as TianQin, gLISA, and GADFLI, the gravity-field disturbances, i.e., the so called ``orbital noise'', from the Earth-Moon system on the sensitive intersatellite laser interferometric measurements should be carefully evaluated and taken into account in the concept studies. Based on TianQin, we investigate how the effect, in terms of frequency spectra, varies with different choices of orbital orientations and radii through single-variable studies, and present the corresponding roll-off frequencies that may set the lower bounds of the targeted detection bands. The results, including the special cases of geostationary orbits (gLISA/GADFLI) and repeat orbits, can provide a useful input to orbit and constellation design for future geocentric missions.
description: 8 pages, 9 figures
Synthesis of organic biaryl and aryl silyl ether linkers for surface functionalization of silicon semiconductors
Creators: name: Konopka, Felicia T.
name: 0000-0003-2251-9869
Publisher: name: The University of Texas at Austin
Year: 2017
Subjects: Molecular wire

description: Functional organic materials for use in inorganic semiconductor applications is of high scientific interest due to the need for flexible, conductive materials that can be utilized in solar energy applications. Herein is described a synthetic route for a new variant of biphenylene linker called 2Ldm-OTf-bpA, which can be used as a building block for future conductive oligophenylene materials in semiconductor devices. With unique ortho-functionalized dimethoxy handles and para-functionalization via triflate and bromo groups, this linker can be chemically modified at the bromo position to attach to silicon semiconductor surfaces. Additionally, a synthetic route for 1-LdSihex₃-OTf is presented which utilizes the modular synthon 1Ld-OH-OTf that can be synthetically modified to generate many variations of small molecules, which can be used to control the steric spacing of molecules on surfaces during functionalization. Conversely, the triflate group can be utilized as a synthetic modification point for future studies of molecular wire growth on silicon surfaces. These molecular wires will be the foundation of future studies for developing a hybrid molecular/materials (HMM) layer on Si(111). These surfaces can then act as anchor points for catalysts for the production of solar fuels conversion such as H₂ from water or the reduction of CO₂ to methanol
Constraints on RG Flows from Holographic Entanglement Entropy
Creators: name: Cremonini, Sera
name: Dong, Xi
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We examine the RG flow of a candidate c-function, extracted from the holographic entanglement entropy of a strip-shaped region, for theories with broken Lorentz invariance. We clarify the conditions on the geometry that lead to a break-down of monotonic RG flows as is expected for generic Lorentz-violating field theories. Nevertheless we identify a set of simple criteria on the UV behavior of the geometry which guarantee a monotonic c-function. Our analysis can thus be used as a guiding principle for the construction of monotonic RG trajectories, and can also prove useful for excluding possible IR behaviors of the theory.
description: 5 pages, no figures
František Jozef arcikniźzi rakouský mistokrá český; [1848]
Creators: name: (:Unav)
Publisher: name: Universitätsbibliothek der Ludwig-Maximilians-Universität München
Year: 2018

description: Vorlageform der Veröffentlichungsangabe: Tiskem J. Höfelicha. Imeni a wýhradné rozmnožowani obehodu umélečkeho Paterno a sina we Widni
Magnetohydrodynamics evolution of three-dimensional magnetic null in NOAA active region 11515 initiated using non-force-free field extrapolation
Creators: name: Kumar, Sanjay
name: Prasad, Avijeet
name: Sarkar, Ranadeep
name: Bhattacharyya, Ramit
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Magnetohydrodynamics simulation of active region NOAA 11515 is performed to examine the initiation of the M5.6 flaring event that starts around 10:43 UT on 2012 July 2. The simulation is conducted using an extrapolated non-force-free magnetic field generated from the photospheric vector magnetogram of the active region as the initial magnetic field. The magnetic field shows the presence of a three-dimensional (3D) magnetic null with the corresponding dome overlying a filament and a low-lying magnetic flux rope, observed in 304~Å~ and 131~Å~ respectively. The simulated dynamics, triggered by the initial Lorentz force, lead to the bifurcations of the flux rope, which is similar to the observed bifurcation in the 131 Å~ brightenings. Additionally, the rope exhibits a rise and reconnects at the 3D null. These reconnections convert field lines of the rope into the anchored outer spine of the 3D null -- explaining the occurrence of a nearby confined C-class flare. Further, the results show that the field lines of the flux rope reach the vicinity of the filament and become non-parallel to the field lines of the filament. This initiates the reconnections between the rope and the field lines of the filament -- activating the filament for the eruption. This interesting interaction of the flux rope and filament seems to contribute to the onset of the M-class flare.
description: 10 Figures
Yield stress in amorphous solids: A mode-coupling theory analysis
Creators: name: Ikeda, Atsushi
name: Berthier, Ludovic
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The yield stress is a defining feature of amorphous materials which is difficult to analyze theoretically, because it stems from the strongly non-linear response of an arrested solid to an applied deformation. Mode-coupling theory predicts the flow curves of materials undergoing a glass transition, and thus offers predictions for the yield stress of amorphous solids. We use this approach to analyse several classes of disordered solids, using simple models of hard sphere glasses, soft glasses, and metallic glasses for which the mode-coupling predictions can be directly compared to the outcome of numerical measurements. The theory correctly describes the emergence of a yield stress of entropic nature in hard sphere glasses, and its rapid growth as density approaches random close packing at qualitative level. By contrast, the emergence of solid behavior in soft and metallic glasses, which originates from direct particle interactions is not well described by the theory. We show that similar shortcomings arise in the description of the vibrational dynamics of the glass phase at rest. We discuss the range of applicability of mode-coupling theory to understand the yield stress and non-linear rheology of amorphous materials.
description: 15 pages, 8 figures
Efficient, uninformative sampling of limb darkening coefficients for two-parameter laws
Creators: name: Kipping, David M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Stellar limb darkening affects a wide range of astronomical measurements and is frequently modelled with a parametric model using polynomials in the cosine of the angle between the line of sight and the emergent intensity. Two-parameter laws are particularly popular for cases where one wishes to fit freely for the limb darkening coefficients (i.e. an uninformative prior) due to the compact prior volume and the fact that more complex models rarely obtain unique solutions with present data. In such cases, we show that the two limb darkening coefficients are constrained by three physical boundary conditions, describing a triangular region in the two-dimensional parameter space. We show that uniformly distributed samples may be drawn from this region with optimal efficiency by a technique developed by computer graphical programming: triangular sampling. Alternatively, one can make draws using a uniform, bivariate Dirichlet distribution. We provide simple expressions for these parametrizations for both techniques applied to the case of quadratic, square-root and logarithmic limb darkening laws. For example, in the case of the popular quadratic law, we advocate fitting for q_1 = (u_1+u_2)^2 and q_2 = 0.5u_1(u_1+u_2)^{-1} with uniform priors in the interval [0,1] to implement triangular sampling easily. Employing these parametrizations allows one to derive model parameters which fully account for our ignorance about the intensity profile, yet never explore unphysical solutions, yielding robust and realistic uncertainty estimates. Furthermore, in the case of triangular sampling with the quadratic law, our parametrization leads to significantly reduced mutual correlations and provides an alternative geometric explanation as to why naively fitting the quadratic limb darkening coefficients precipitates strong correlations in the first place.
description: 11 pages, 5 figures, 2 tables, accepted in MNRAS
Quantum-limited shot noise and quantum interference in graphene based Corbino disk
Creators: name: Rut, Grzegorz
name: Rycerz, Adam
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: This is a theoretical study of finite voltage effects on the conductance, the shot noise power, and the third charge-transfer cumulant for graphene-based Corbino disk in the presence of external magnetic fields. Periodic magnetoconductance oscillations, predicted in Refs. [1,2], become invisible for relatively small source-drain voltages, as the current decays rapidly with magnetic field. Quantum interference still governs the behavior of higher charge-transfer cumulants.
description: Minor revisions, PACS Nos. added. RevTeX, 5 pages, 3 figures
Self-organizing nest migration dynamics synthesis for ant colony systems
Creators: name: Macktoobian, Matin
Publisher: name: arXiv
Year: 2022
Subjects: subject: Robotics (cs.RO)
subject: Multiagent Systems (cs.MA)
subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Computer and information sciences

description: In this study, we synthesize a novel dynamical approach for ant colonies enabling them to migrate to new nest sites in a self-organizing fashion. In other words, we realize ant colony migration as a self-organizing phenotype-level collective behavior. For this purpose, we first segment the edges of the graph of ants' pathways. Then, each segment, attributed to its own pheromone profile, may host an ant. So, multiple ants may occupy an edge at the same time. Thanks to this segment-wise edge formulation, ants have more selection options in the course of their pathway determination, thereby increasing the diversity of their colony's emergent behaviors. In light of the continuous pheromone dynamics of segments, each edge owns a spatio-temporal piece-wise continuous pheromone profile in which both deposit and evaporation processes are unified. The passive dynamics of the proposed migration mechanism is sufficiently rich so that an ant colony can migrate to the vicinity of a new nest site in a self-organizing manner without any external supervision. In particular, we perform extensive simulations to test our migration dynamics applied to a colony including 500 ants traversing a pathway graph comprising 200 nodes and 4000 edges which are segmented based on various resolutions. The obtained results exhibit the effectiveness of our strategy.
Split Knockoffs for Multiple Comparisons: Controlling the Directional False Discovery Rate
Creators: name: Cao, Yang
name: Sun, Xinwei
name: Yao, Yuan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: Multiple comparisons in hypothesis testing often encounter structural constraints in various applications. For instance, in structural Magnetic Resonance Imaging for Alzheimer's Disease, the focus extends beyond examining atrophic brain regions to include comparisons of anatomically adjacent regions. These constraints can be modeled as linear transformations of parameters, where the sign patterns play a crucial role in estimating directional effects. This class of problems, encompassing total variations, wavelet transforms, fused LASSO, trend filtering, and more, presents an open challenge in effectively controlling the directional false discovery rate. In this paper, we propose an extended Split Knockoff method specifically designed to address the control of directional false discovery rate under linear transformations. Our proposed approach relaxes the stringent linear manifold constraint to its neighborhood, employing a variable splitting technique commonly used in optimization. This methodology yields an orthogonal design that benefits both power and directional false discovery rate control. By incorporating a sample splitting scheme, we achieve effective control of the directional false discovery rate, with a notable reduction to zero as the relaxed neighborhood expands. To demonstrate the efficacy of our method, we conduct simulation experiments and apply it to two real-world scenarios: Alzheimer's Disease analysis and human age comparisons.
description: Journal of the American Statistical Association, 2023
10 Inventions on Keyboard Key Switch Mechanism
Creators: name: Mishra, Umakant
Publisher: name: arXiv
Year: 2013
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: The key switches of the keyboard of a computer system are generally comprised of a key cap having a plunger, conductive rubber disposed above a membrane circuit and compressed by the plunger to trigger the membrane circuit causing it to produce an electric signal to the computer. Some key switches use springs. Some other keyboards use rubber domes or a dome sheet, which do the function of springs. When the user depresses the key button the spring or domes collapse. The key switch depresses the key stem, which actuates the button on the membrane circuit. When the user releases the button the springs or rubber domes push the button up to the rest position. This article illustrates 10 inventions on different key switch mechanism. The inventions are selected from US patent database. The inventions try to simplify the mechanism, reduce manufacturing cost, increase accuracy and reliability, and increase strength and robustness of the keys.
description: Published in TRIZsite Journal, May 2005, also available in http://papers.ssrn.com/abstract=932273
MCRepair: Multi-Chunk Program Repair via Patch Optimization with Buggy Block
Creators: name: Kim, Jisung
name: Lee, Byeongjung
Publisher: name: arXiv
Year: 2023
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Automated program repair (APR) is a technology that identifies and repairs bugs automatically. However, repairing multi-chunk bugs remains a long-standing and challenging problem because an APR technique must consider dependencies and then reduce the large patch space. In addition, little is known about how to combine individual candidate patches even though multi-chunk bugs require combinations. Therefore, we propose a novel APR technique called multi-code repair (MCRepair), which applies a buggy block, patch optimization, and CodeBERT to target multi-chunk bugs. A buggy block is a novel method that binds buggy chunks into a multi-buggy chunk and preprocesses the chunk with its buggy contexts for patch space reduction and dependency problems. Patch optimization is a novel strategy that effectively combines the generated candidate patches with patch space reduction. In addition, CodeBERT, a BERT for source code datasets, is fine-tuned to address the lack of datasets and out-of-vocabulary problems. We conducted several experiments to evaluate our approach on six project modules of Defects4J. In the experiments using Defects4J, MCRepair repaired 65 bugs, including 21 multi-chunk bugs. Moreover, it fixed 18 unique bugs, including eight multi-chunk bugs, and improved 40 to 250 percent performance than the baselines.
description: 3 pages
A Wintgen type inequality for surfaces in 4D neutral pseudo-Riemannian space forms and its applications to minimal immersions
Creators: name: Chen, Bang-Yen
Publisher: name: arXiv
Year: 2013
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: Differential Geometry

description: Let $M$ be a space-like surface immersed in a 4-dimensional pseudo-Riemannian space form $R^4_2(c)$ with constant sectional curvature $c$ and index two. In the first part of this article, we prove that the Gauss curvature $K$, the normal curvature $K^D$, and mean curvature vector $H$ of $M$ satisfy the general inequality: $K+K^D\geq H,H +c$. In the second part, we investigate space-like minimal surfaces in $R^4_2(c)$ which satisfy the equality case of the inequality identically. Several classification results in this respect are then obtained.
description: 13 pages
A Transformation Method to Construct Family of Exactly Solvable Potentials in Quantum Mechanics
Creators: name: Bhagawati, Nabaratna
name: Saikia, N
name: Singh, N Nimai
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: A transformation method is applied to the second order ordinary differential equation satisfied by orthogonal polynomials to construct a family of exactly solvable quantum systems in any arbitrary dimensional space. Using the properties of orthogonal polynomials, the method transforms polynomial differential equation to D-dimensional radial Schrodinger equation which facilitates construction of exactly solvable quantum systems. The method is also applied using associated Laguerre and Hypergeometric polynomials. The quantum systems generated from other polynomials are also briefly highlighted.
description: 11 pages
GERLUMPH Data Release 1: High-resolution cosmological microlensing magnification maps and eResearch tools
Creators: name: Vernardos, Georgios
name: Fluke, Christopher J
name: Bate, Nicholas F
name: Croton, Darren
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: As synoptic all-sky surveys begin to discover new multiply lensed quasars, the flow of data will enable statistical cosmological microlensing studies of sufficient size to constrain quasar accretion disc and supermassive black hole properties. In preparation for this new era, we are undertaking the GPU-Enabled, High Resolution cosmological MicroLensing parameter survey (GERLUMPH). We present here the GERLUMPH Data Release 1, which consists of 12342 high resolution cosmological microlensing magnification maps and provides the first uniform coverage of the convergence, shear and smooth matter fraction parameter space. We use these maps to perform a comprehensive numerical investigation of the mass-sheet degeneracy, finding excellent agreement with its predictions. We study the effect of smooth matter on microlensing induced magnification fluctuations. In particular, in the minima and saddle-point regions, fluctuations are enhanced only along the critical line, while in the maxima region they are always enhanced for high smooth matter fractions (~0.9). We describe our approach to data management, including the use of an SQL database with a Web interface for data access and online analysis, obviating the need for individuals to download large volumes of data. In combination with existing observational databases and online applications, the GERLUMPH archive represents a fundamental component of a new microlensing eResearch cloud. Our maps and tools are publicly available at http://gerlumph.swin.edu.au/.
description: 9 pages, 9 figures, 2 tables, accepted for publication in ApJ
Embeddability of joins and products of polyhedra
Creators: name: Melikhov, Sergey A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics

description: We present a short proof of S. Parsa's theorem that there exists a compact $n$-polyhedron $P$, $n\ge 2$, non-embeddable in $\mathbb R^{2n}$, such that $P*P$ embeds in $\mathbb R^{4n+2}$. This proof can serve as a showcase for the use of geometric cohomology. We also show that a compact $n$-polyhedron $X$ embeds in $\mathbb R^m$, $m\ge\frac{3(n+1)}2$, if either - $X*K$ embeds in $\mathbb R^{m+2k}$, where $K$ is the $(k-1)$-skeleton of the $2k$-simplex; or - $X*L$ embeds in $\mathbb R^{m+2k}$, where $L$ is the join of $k$ copies of the $3$-point set; or - $X$ is acyclic and $X\times\text{(triod)}^k$ embeds in $\mathbb R^{m+2k}$.
description: 14 pages. A half of the present paper is a more detailed exposition, with minor errors corrected, of two pages (asserions 4.3-4.8 in pages 20-22) from arXiv:math/0612085v1
title: Volkstribun No. 2!; [1848?]
title: "in Amt & Würden" : "im Geschäft"
titleType: Subtitle
Creators: name: (:Unav)
Publisher: name: Universitätsbibliothek der Ludwig-Maximilians-Universität München
Year: 2018

description: Flugblatt mit zwei Karikaturen auf einen Abgeordneten der Frankfurter Nationalversammlung mit sehr langen Haaren. "in Amt & Würden" wird er von hinten mit offenen Haaren die Sitzungsglocke läutend dargestellt, "im Geschäft" lehnt er auf auf einer Fensterbank über die seine Haare wallen. Der Straßenname lautet "Gruft-Gasse"
A triple-point Whitney trick
Creators: name: Melikhov, Sergey A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics

description: We use a triple-point version of the Whitney trick to show that ornaments of three orientable $(2k-1)$-manifolds in $\mathbb R^{3k-1}$, $k>2$, are classified by the $μ$-invariant. A very similar (but not identical) construction was found independently by I. Mabillard and U. Wagner, who also made it work in a much more general situation and obtained impressive applications. The present note is, by contrast, focused on a minimal working case of the construction.
description: 5 pages. This paper is a more detailed exposition of 1.5 pages (Theorem 1.1 on pages 6-8) from arXiv:1711.03530v1
Multi-Task Dynamical Systems
Creators: name: Bird, Alex
name: Williams, Christopher K. I.
name: Hawthorne, Christopher
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Time series datasets are often composed of a variety of sequences from the same domain, but from different entities, such as individuals, products, or organizations. We are interested in how time series models can be specialized to individual sequences (capturing the specific characteristics) while still retaining statistical power by sharing commonalities across the sequences. This paper describes the multi-task dynamical system (MTDS); a general methodology for extending multi-task learning (MTL) to time series models. Our approach endows dynamical systems with a set of hierarchical latent variables which can modulate all model parameters. To our knowledge, this is a novel development of MTL, and applies to time series both with and without control inputs. We apply the MTDS to motion-capture data of people walking in various styles using a multi-task recurrent neural network (RNN), and to patient drug-response data using a multi-task pharmacodynamic model.
description: 52 pages, 17 figures
A Bouquet for Apollonius: Focal Conics in Sessile Cholesteric Droplets
Creators: name: Kamien, Randall D.
name: Nastishin, Yuriy
name: Pansu, Brigitte
Publisher: name: arXiv
Year: 2023
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Focal conic domains, are defects characteristic of layered liquid crystal phases. Their association can built flowers where petals are the ellipses of the Dupin cyclides involved in these defect. We report here the observation of focal conic flowers in cholesteric droplets sessile on a glass surface and surrounded by glycerol. The observation of the droplets in different directions helps to solve the 3D architecture of the flower. The effects of the droplet size and of the pitch value are also reported.
description: 8 pages, figures, references, the full catastrophe
Dedicating Cellular Infrastructure for Aerial Users: Advantages and Potential Impact on Ground Users
Creators: name: Chen, Lin
name: Kishk, Mustafa A.
name: Alouini, Mohamed-Slim
Publisher: name: arXiv
Year: 2022
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: A new generation of aerial vehicles is hopeful to be the next frontier for the transportation of people and goods, becoming even as important as ground users in the communication systems. To enhance the coverage of aerial users, appropriate adjustments should be made to the existing cellular networks that mainly provide services for ground users by the down-tilted antennas of the terrestrial base stations (BSs). It is promising to up-tilt the antennas of a subset of BSs for serving aerial users through the mainlobe. With this motivation, in this work, we use tools from stochastic geometry to analyze the coverage performance of the adjusted cellular network (consisting of the up-tilted BSs and the down-tilted BSs). Correspondingly, we present exact and approximate expressions of the signal-to-interference ratio (SIR)-based coverage probabilities for users in the sky and on the ground, respectively. Numerical results verify the analysis accuracy and clarify the advantages of up-tilting BS antennas on the communication connectivity of aerial users without the potential adverse impact on the quality of service (QoS) of ground users.
Measuring cosmological parameters with Gamma-Ray Bursts
Creators: name: Amati, Lorenzo
name: Della Valle, Massimo
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: In a few dozen seconds gamma ray bursts (GRBs) emit up to 10^54 erg in terms of an equivalent isotropically radiated energy Eiso, so they can be observed up to z ~10. Thus, these phenomena appear to be very promising tools to describe the expansion rate history of the universe. Here we review the use of the Ep,i - Eiso correlation of GRBs to measure the cosmological density parameter Omega_M. We show that the present data set of Gamma-Ray Bursts, coupled with the assumption that we live in a flat universe, can provide independent evidence, from other probes, that Omega_M ~0.3. We show that current (e.g., Swift, Fermi/GBM, Konus-WIND) and forthcoming GRB experiments (e.g., CALET/GBM, SVOM, Lomonosov/UFFO, LOFT/WFM) will allow us to constrain Omega_M with an accuracy comparable to that currently exhibited by Type Ia supernovae and to study the properties of dark energy and their evolution with time.
description: 13 pages, 7 figures, International Journal of Modern Physics D, in press
Intrinsically Polarized Stars and Implication for Star Formation in the Central Parsec of Our Galaxy
Creators: name: Yoshikawa, Tatsuhito
name: Nishiyama, Shogo
name: Tamura, Motohide
name: Ishii, Miki
name: Nagata, Tetsuya
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We have carried out adaptive-optics assisted observations at the Subaru telescope, and have found 11 intrinsically polarized sources in the central parsec of our Galaxy. They are selected from 318 point sources with Ks<15.5, and their interstellar polarizations are corrected using a Stokes Q/I - U/I diagram. Considering brightness, near-infrared color excess, and the amount of intrinsic polarization, two of them are good young stellar object (YSO) candidates with an age of ~10^5 yr. If they are genuine YSOs, their existence provides strong constraints on star formation mechanisms in this region. In the remaining sources, two are known as bow-shock sources in the Northern arm. One other is also located in the Northern arm and shows very similar properties, and thus likely to be a so far unknown bow-shock source. The origin of the intrinsic polarization of the other sources is as yet uncertain.
description: 28 pages, 10 figures, 2 tables, accepted for publication in ApJ
Generalization of the Einstein coefficients and rate equations under the quantum Rabi oscillation
Creators: name: Islam, Najirul
name: Biswas, Shyamal
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We have generalized Einstein coefficients and rate equations from quantum field theoretic point of view by bringing the fundamental processes and the quantum Rabi oscillation in a single footing for the light-matter interactions for nonzero Rabi frequency. We have analytically obtained multimode Jaynes-Cummings model results for the quantum Rabi oscillations of a two-level system in a lossy resonant cavity containing (i) thermal photons and (ii) injected photons of a coherent field. We have renormalized the coupling constant for the light-matter interactions for these cases. Our results match well with the seminal experimental data obtained in this regard by Brune et al [Phys. Rev. Lett 76, 1800 (1996)]. We also have studied the population dynamics in this regard by applying the generalized Einstein rate equations.
description: 11 pages, 4 figures; We have corrected the Q-factor for the dotted line of figure 2-a
Entanglement and quantum teleportation under superposed gravitational fields
Creators: name: Li, Yue
name: Zhang, Baocheng
name: You, Li
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The influence of gravitational field on entanglement of bipartite states is investigated based on the recent idea of superposition states of gravitational field. Different from earlier considerations, we study the case where the gravitational field cannot be separated unitarily from the bipartite system in the final stage of the interaction. When the different gravitational field states are orthogonal, entanglement cannot be generated for an initial product state. If the different gravitational field states are non-orthogonal, entanglement can be generated and the amount of generated entanglement depends on an overlap parameter between different gravitational field states. The influence of gravitational field on the transfer of the state through quantum teleportation is also studied, which might lead to an observable effect since the quantum teleportation can be performed using macroscopic object.
Discovery of Megaparsec-Scale, Low Surface Brightness Nonthermal Emission in Merging Galaxy Clusters using the Green Bank Telescope
Creators: name: Farnsworth, Damon
name: Rudnick, Lawrence
name: Brown, Shea
name: Brunetti, Gianfranco
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present results on 12 X-ray bright clusters observed at 1.4 GHz with the Green Bank Telescope. After subtraction of point sources, we reach a median (best) 1-sigma noise level of 0.01 (0.006) microJy/sq. arcsec, and find a significant excess of diffuse, low surface brightness emission in 11 of 12 clusters. We present initial 1.4 GHz Very Large Array results on Abell 2319. We find: (a) four new detections tentatively classified as two halos (A2065, A2069) and two relics (A2067, A2073); (b) the first detection of the radio halo in A2061 at 1.4 GHz, making it a possible ultra-steep spectrum halo (alpha ~ 1.8); (c) a ~2 Mpc radio halo in the sloshing, minor-merger cluster A2142; (d) a >2x increase of the giant radio halo extent and luminosity in A2319; (e) a ~7x increase to the integrated radio flux and >4x increase to the observed extent of the peripheral, polarized radio relic in A1367 to ~600 kpc; (f) significant excess emission of ambiguous nature in three clusters. Our radio halo detections agree with the well-known X-ray/radio luminosity correlation, but are larger and fainter than expected. The volume averaged synchrotron emissivities are 1-2 orders of magnitude below the previous characteristic values. Some of the halo-like detections may represent previously unseen, very low surface brightness emission or blends of shock structures and sub-Mpc scale turbulent regions. Four of the five tentative halos contain one or more X-ray cold fronts, suggesting a possible connection between gas sloshing and particle acceleration on large scales. We see evidence for a possible inter-cluster filament between A2061 and A2067. For our faintest detections, we note the possibility of residual contamination from faint radio galaxies. We also quantify the sensitivity of the NVSS to extended emission as a function of angular size.[abridged]
description: 28 pages, 21 figures. ApJ, in press
Storage and retrieval of electromagnetic waves in a metasurface based on bound states in the continuum by conductivity modulation
Creators: name: Nakanishi, Toshihiro
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optics (physics.optics)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: In this study, we develop a time-varying metasurface based on the bound states in the continuum (BIC) with variable conductors, to store electromagnetic waves. The storage and retrieval of electromagnetic waves are demonstrated numerically through dynamic switching between quasi-BIC and BIC states by modulating the variable conductors. The storage efficiency exhibits oscillatory behavior with respect to the timing of storage and retrieval. These behaviors can be attributed to the interference of a resonant mode and a static mode that is formed by direct current. In addition, the storage efficiency of a single-layer metasurface can reach 35% under ideal conditions.
description: 7 pages, 8 figures
Sitzungsgebäude der deutschen Reichsversammlung; [1848]
Creators: name: (:Unav)
Publisher: name: Universitätsbibliothek der Ludwig-Maximilians-Universität München
Year: 2018

description: Vorlageform der Veröffentlichungsangabe: Lith Anst v Ed Gust May in Frankfurt aM. - Verlag u. Eigenthum der S. Schmerber'schen Buchhandlung (Nachfolger H. Keller) in Frankfurt a M
Aerial-Aided mmWave VANETs Using NOMA: Performance Analysis, Comparison, and Insights
Creators: name: Zaid, Abdullah Abu
name: Belmekki, Baha Eddine Youcef
name: Alouini, Mohamed-Slim
Publisher: name: arXiv
Year: 2023
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In this paper, we propose the integration of tethered flying platforms in cooperative vehicular ad hoc networks (VANETs) to alleviate the problems of rapid urbanization. In this context, we study the performance of VANETs by deriving approximate outage probability and average achievable rate expressions using tools from stochastic geometry. We compare between the usage of networked tethered flying platforms (NTFPs) and traditional roadside units (RSUs). On the other hand, the rapid increase of smart devices in vehicles and the upcoming urban air mobility (UAM) vision will congest the spectrum and require increased data rates. Hence, we use non-orthogonal multiple access (NOMA) to improve spectral efficiency and compare its performance to orthogonal access schemes. Furthermore, we utilize millimeter-wave (mmWave) frequencies for high data rates and implement a sectored beamforming model. We extensively study the system using three transmission schemes: direct, relay, and hybrid transmission. The results show that when acting as relays, NTFPs outperform RSUs for larger distances between the transmitting and the receiving vehicles, while RSUs outperform NTFPs for short distances. However, NTFPs are the best solution when acting as a source. Moreover, we find that, in most cases, direct transmission is preferred to achieve a high rate compared to other schemes. Finally, the results are summarized in two tables that provide insights into connecting VANETs by selecting the most suitable platform and type of communication for a given set of parameters, configurations, and requirements.
Multi-mode Jaynes-Cummings model results for the collapse and the revival of the quantum Rabi oscillations in a lossy resonant cavity
Creators: name: Islam, Najirul
name: Biswas, Shyamal
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We have numerically obtained theoretical results for the collapse and the revival of the quantum Rabi oscillations for low average number of coherent photons injected on a two-level system in a lossy resonant cavity. We have adopted the multimode Jaynes-Cummings model for the same and especially treated the ``Ohmic" loss to the walls of the cavity, the leakage from the cavity, and the loss due to the spontaneous emission through the open surface of the cavity. We have compared our results with the experimental data obtained by Brune et al [Phys. Rev. Lett. 76, 1800 (1996)] in this regard.
description: 8 pages, 3 figures
Contributing Components of Metabolic Energy Models to Metabolic Cost Estimations in Gait
Creators: name: Gambietz, Markus
name: Nitschke, Marlies
name: Miehling, Jörg
name: Koelewijn, Anne
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Objective: As metabolic cost is a primary factor influencing humans' gait, we want to deepen our understanding of metabolic energy expenditure models. Therefore, this paper identifies the parameters and input variables, such as muscle or joint states, that contribute to accurate metabolic cost estimations. Methods: We explored the parameters of four metabolic energy expenditure models in a Monte Carlo sensitivity analysis. Then, we analysed the model parameters by their calculated sensitivity indices, physiological context, and the resulting metabolic rates during the gait cycle. The parameter combination with the highest accuracy in the Monte Carlo simulations represented a quasi-optimized model. In the second step, we investigated the importance of input parameters and variables by analysing the accuracy of neural networks trained with different input features. Results: Power-related parameters were most influential in the sensitivity analysis and the neural network-based feature selection. We observed that the quasi-optimized models produced negative metabolic rates, contradicting muscle physiology. Neural network-based models showed promising abilities but have been unable to match the accuracy of traditional metabolic energy expenditure models. Conclusion: We showed that power-related metabolic energy expenditure model parameters and inputs are most influential during gait. Furthermore, our results suggest that neural network-based metabolic energy expenditure models are viable. However, bigger datasets are required to achieve better accuracy. Significance: As there is a need for more accurate metabolic energy expenditure models, we explored which musculoskeletal parameters are essential when developing a model to estimate metabolic energy.
Rapidly varying A-type stars in the SuperWASP archive
Creators: name: Holdsworth, Daniel L.
name: Smalley, Barry
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The searches for transiting exoplanets have produced a vast amount of time-resolved photometric data of many millions of stars. One of the leading ground-based surveys is the SuperWASP project. We present the initial results of a survey of over 1.5 million A-type stars in the search for high frequency pulsations using SuperWASP photometry. We are able to detect pulsations down to the 0.5 mmag level in the broad-band photometry. This has enabled the discovery of several rapidly oscillating Ap stars and over 200 delta Scuti stars with frequencies above 50 d$^{-1}$, and at least one pulsating sdB star. Such a large number of results allows us to statistically study the frequency overlap between roAp and delta Scuti stars and probe to higher frequency regimes with existing data.
description: 2 pages, 2 figures. To appear in proceedings of IAU Symposium 301, Precision Asteroseismology, August 2013, Wroc{\l}aw, Poland
Orbital-selective metal skin induced by alkali-metal-dosing Mott-insulating Ca$_2$RuO$_4$
Creators: name: Horio, M.
name: Forte, F.
name: Sutter, D.
name: Kim, M.
name: Fatuzzo, C. G.
name: Matt, C. E.
name: Moser, S.
name: Wada, T.
name: Granata, V.
name: Fittipaldi, R.
name: Sassa, Y.
name: Gatti, G.
name: Rønnow, H. M.
name: Hoesch, M.
name: Kim, T. K.
name: Jozwiak, C.
name: Bostwick, A.
name: Rotenberg, Eli
name: Matsuda, I.
name: Georges, A.
name: Sangiovanni, G.
name: Vecchione, A.
name: Cuoco, M.
name: Chang, J.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Doped Mott insulators are the starting point for interesting physics such as high temperature superconductivity and quantum spin liquids. For multi-band Mott insulators, orbital selective ground states have been envisioned. However, orbital selective metals and Mott insulators have been difficult to realize experimentally. Here we demonstrate by photoemission spectroscopy how Ca$_2$RuO$_4$, upon alkali-metal surface doping, develops a single-band metal skin. Our dynamical mean field theory calculations reveal that homogeneous electron doping of Ca$_2$RuO$_4$ results in a multi-band metal. All together, our results provide compelling evidence for an orbital-selective Mott insulator breakdown, which is unachievable via simple electron doping. Supported by a cluster model and cluster perturbation theory calculations, we demonstrate a novel type of skin metal-insulator transition induced by surface dopants that orbital-selectively hybridize with the bulk Mott state and in turn produce coherent in-gap states.
description: A revised version of this manuscript will appear in Communications Physics
Powers of Tensors and Fast Matrix Multiplication
Creators: name: Gall, François Le
Publisher: name: arXiv
Year: 2014
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: Computational Complexity (cs.CC)
subject: Symbolic Computation (cs.SC)
subject: FOS: Computer and information sciences

description: This paper presents a method to analyze the powers of a given trilinear form (a special kind of algebraic constructions also called a tensor) and obtain upper bounds on the asymptotic complexity of matrix multiplication. Compared with existing approaches, this method is based on convex optimization, and thus has polynomial-time complexity. As an application, we use this method to study powers of the construction given by Coppersmith and Winograd [Journal of Symbolic Computation, 1990] and obtain the upper bound $ω<2.3728639$ on the exponent of square matrix multiplication, which slightly improves the best known upper bound.
description: 28 pages
Supplemental files (3 tables and 8 figures) for "House dust mite sensitization profiles in China, a multi-center study"
Creators: name: Hui, Gan
Publisher: name: Zenodo
Year: 2022
Subjects: mite, allergen, China

description: Supplemental files (3 tables and 8 figures) for "House dust mite sensitization profiles in China, a multi-center study".
Warpformer: A Multi-scale Modeling Approach for Irregular Clinical Time Series
Creators: name: Zhang, Jiawen
name: Zheng, Shun
name: Cao, Wei
name: Bian, Jiang
name: Li, Jia
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Irregularly sampled multivariate time series are ubiquitous in various fields, particularly in healthcare, and exhibit two key characteristics: intra-series irregularity and inter-series discrepancy. Intra-series irregularity refers to the fact that time-series signals are often recorded at irregular intervals, while inter-series discrepancy refers to the significant variability in sampling rates among diverse series. However, recent advances in irregular time series have primarily focused on addressing intra-series irregularity, overlooking the issue of inter-series discrepancy. To bridge this gap, we present Warpformer, a novel approach that fully considers these two characteristics. In a nutshell, Warpformer has several crucial designs, including a specific input representation that explicitly characterizes both intra-series irregularity and inter-series discrepancy, a warping module that adaptively unifies irregular time series in a given scale, and a customized attention module for representation learning. Additionally, we stack multiple warping and attention modules to learn at different scales, producing multi-scale representations that balance coarse-grained and fine-grained signals for downstream tasks. We conduct extensive experiments on widely used datasets and a new large-scale benchmark built from clinical databases. The results demonstrate the superiority of Warpformer over existing state-of-the-art approaches.
description: KDD23 Research Track