cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Two-size approximation: a simple way of treating the evolution of grain size distribution in galaxies
Creators: name: Hirashita, Hiroyuki
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Full calculations of the evolution of grain size distribution in galaxies are in general computationally heavy. In this paper, we propose a simple model of dust enrichment in a galaxy with a simplified treatment of grain size distribution by imposing a `two-size approximation'; that is, all the grain population is represented by small (grain radius a < 0.03 micron) and large (a > 0.03 micron) grains. We include in the model dust supply from stellar ejecta, destruction in supernova shocks, dust growth by accretion, grain growth by coagulation and grain disruption by shattering, considering how these processes work on the small and large grains. We show that this simple framework reproduces the main features found in full calculations of grain size distributions as follows. The dust enrichment starts with the supply of large grains from stars. At a metallicity level referred to as the critical metallicity of accretion, the abundance of the small grains formed by shattering becomes large enough to rapidly increase the grain abundance by accretion. Associated with this epoch, the mass ratio of the small grains to the large grains reaches the maximum. After that, this ratio converges to the value determined by the balance between shattering and coagulation, and the dust-to-metal ratio is determined by the balance between accretion and shock destruction. With a Monte Carlo simulation, we demonstrate that the simplicity of our model has an advantage in predicting statistical properties. We also show some applications for predicting observational dust properties such as extinction curves.
description: 14 pages, 12 figures, accepted for publication in MNRAS
Accelerating core-level $GW$ calculations by combining the contour deformation approach with the analytic continuation of $W$
Creators: name: Panadés-Barrueta, Ramón L.
name: Golze, Dorothea
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: In recent years, the $GW$ method has emerged as a reliable tool for computing core-level binding energies. The contour deformation (CD) technique has been established as an efficient, scalable, and numerically stable approach to compute the $GW$ self-energy for deep core excitations. However, core-level $GW$ calculations with CD face the challenge of higher scaling with respect to system size $N$ compared to the conventional quartic scaling in valence state algorithms. In this work, we present the CD-WAC method (CD with $W$ Analytic Continuation), which reduces the scaling of CD applied to the inner shells from $O(N^5)$ to $O(N^4)$ by employing an analytic continuation of the screened Coulomb interaction $W$. Our proposed method retains the numerical accuracy of CD for the computationally challenging deep core case, yielding mean absolute errors $<5$ meV for well-established benchmark sets, such as CORE65, for single-shot $GW$ calculations. More extensive testing for different $GW$ flavors prove the reliability of the method. We have confirmed the theoretical scaling by performing scaling experiments on large acene chains and amorphous carbon clusters, achieving speedups of up to 10x for structures of only 116 atoms. This improvement in computational efficiency paves the way for more accurate and efficient core-level $GW$ calculations on larger and more complex systems.
DRL-VO: Learning to Navigate Through Crowded Dynamic Scenes Using Velocity Obstacles
Creators: name: Xie, Zhanteng
name: Dames, Philip
Publisher: name: arXiv
Year: 2023
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: This paper proposes a novel learning-based control policy with strong generalizability to new environments that enables a mobile robot to navigate autonomously through spaces filled with both static obstacles and dense crowds of pedestrians. The policy uses a unique combination of input data to generate the desired steering angle and forward velocity: a short history of lidar data, kinematic data about nearby pedestrians, and a sub-goal point. The policy is trained in a reinforcement learning setting using a reward function that contains a novel term based on velocity obstacles to guide the robot to actively avoid pedestrians and move towards the goal. Through a series of 3D simulated experiments with up to 55 pedestrians, this control policy is able to achieve a better balance between collision avoidance and speed (i.e., higher success rate and faster average speed) than state-of-the-art model-based and learning-based policies, and it also generalizes better to different crowd sizes and unseen environments. An extensive series of hardware experiments demonstrate the ability of this policy to directly work in different real-world environments with different crowd sizes with zero retraining. Furthermore, a series of simulated and hardware experiments show that the control policy also works in highly constrained static environments on a different robot platform without any additional training. Lastly, several important lessons that can be applied to other robot learning systems are summarized. Multimedia demonstrations are available at https://www.youtube.com/watch?v=KneELRT8GzU&list=PLouWbAcP4zIvPgaARrV223lf2eiSR-eSS.
description: Accepted by IEEE Transactions on Robotics (T-RO), 2023
MPEC 2024-R322 : 2024 RD16
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2024 RD16

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cosmological solutions to the Lithium problem: Big-bang nucleosynthesis with photon cooling, $X$-particle decay and a primordial magnetic field
Creators: name: Yamazaki, Dai G.
name: Kusakabe, Motohiko
name: Kajino, Toshitaka
name: Mathews, Grant. J.
name: Cheoun, Myung-Ki
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The $^7$Li abundance calculated in BBN with the baryon-to-photon ratio fixed from fits to the CMB power spectrum is inconsistent with the observed lithium abundances on the surface of metal-poor halo stars. Previous cosmological solutions proposed to resolve this $^7$Li problem include photon cooling (possibly via the Bose-Einstein condensation of a scalar particle) or the decay of a long-lived $X-$particle (possibly the next-to-lightest supersymmetric particle). In this paper we reanalyze these solutions, both separately and in concert. We also introduce the possibility of a primordial magnetic field (PMF) into these models. We constrain the $X-$particles and the PMF parameters by the observed light element abundances using a likelihood analysis to show that the inclusion of all three possibilities leads to an optimum solution to the lithium problem. We deduce allowed ranges for the $X-$particle parameters and energy density in the PMF that can solve $^7$Li problem.
description: 11 pages, 3 figures. Accepted 4 June 2014 publication in Physical Review D
Phase-coded Radar Waveform Design with Quantum Annealing
Creators: name: Presles, Timothe
name: Enderli, Cyrille
name: Burel, Gilles
name: Baghious, El Houssain
Publisher: name: arXiv
Year: 2023
Subjects: subject: Emerging Technologies (cs.ET)
subject: FOS: Computer and information sciences

description: The Integrated Side Lobe Ratio (ISLR) problem we consider here consists in finding optimal sequences of phase shifts in order to minimize the mean squared cross-correlation side lobes of a transmitted radar signal and a mismatched replica. Currently, ISLR does not seem to be easier than the general polynomial unconstrained binary problem, which is NP-hard. In our work, we aim to take advantage of the exponential scalability of quantum computing to find new optima, by solving the ISLR problem on a quantum annealer. This quantum device is designed to solve quadratic optimization problems with binary variables (QUBO). After proposing suitable formulation for different instances of the ISLR, we discuss the performances and the scalability of our approach on the D-Wave quantum computer. More broadly, our work enlightens the limits and potential of the adiabatic quantum computation for the solving of large instances of combinatorial optimization problems.
description: 11 pages, 4 figures, 1 table, to be published in IET Radar, Sonar and Navigation
Finite-temperature critical behaviors in 2D long-range quantum Heisenberg model
Creators: name: Zhao, Jiarui
name: Song, Menghan
name: Qi, Yang
name: Rong, Junchen
name: Meng, Zi Yang
Publisher: name: arXiv
Year: 2023
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The Mermin-Wagner theorem states that spontaneous continuous symmetry breaking is prohibited in systems with short-range interactions at spatial dimension $D\le 2$. For long-range interactions with a power-law form ($1/r^α$), the theorem further forbids ferromagnetic or antiferromagnetic order at finite temperature when $α\ge 2D$. However, the situation for $α\in (2,4)$ at $D=2$ is not covered by the theorem. To address this, we conduct large-scale quantum Monte Carlo simulations and field theoretical analysis. Our findings show spontaneous breaking of $SU(2)$ symmetry in the ferromagnetic Heisenberg model with $1/r^α$-form long-range interactions at $D=2$. We determine critical exponents through finite-size analysis for $α<3$ (above the upper critical dimension with Gaussian fixed point) and $3\leα<4$ (below the upper critical dimension with non-Gaussian fixed point). These results reveal new critical behaviors in 2D long-range Heisenberg models, encouraging further experimental studies of quantum materials with long-range interactions beyond the Mermin-Wagner theorem's scope.
MPEC 2024-R323 : 2024 RE16
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2024 RE16

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Ab initio study of InxGa(1-x)N - performance of the alchemical mixing approximation
Creators: name: Scharoch, P.
name: Winiarski, M. J.
name: Polak, M. P.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The alchemical mixing approximation which is the ab initio pseudopotential specific implementation of the virtual crystal approximation (VCA), offered in the ABINIT package, has been employed to study the wurtzite (WZ) and zinc blende (ZB) InxGa(1-x)N alloy from first principles. The investigations were focused on structural properties (the equilibrium geometries), elastic properties (elastic constants and their pressure derivatives), and on the band-gap. Owing to the ABINIT functionality of calculating the Hellmann-Feynmann stresses, the elastic constants have been evaluated directly from the strain-stress relation. Values of all the quantities calculated for parent InN and GaN have been compared with the literature data and then evaluated as functions of composition x on a dense, 0.05 step, grid. Some results have been obtained which, to authors' knowledge, have not yet been reported in the literature, like composition dependent elastic constants in ZB structures or composition dependent pressure derivatives of elastic constants. The band-gap has been calculated within the MBJLDA approximation. Additionally, the band-gaps for pure $InN$ and GaN have been calculated with the Wien2k code, for comparison purposes. The evaluated quantities have been compared with the available literature reporting supercell-based ab initio calculations and on that basis conclusions concerning the performance of the alchemical mixing approach have been drawn. ...
description: 35 pages, 11 figures
Description Logics with Abstraction and Refinement
Creators: name: Lutz, Carsten
name: Schulze, Lukas
Publisher: name: arXiv
Year: 2023
Subjects: subject: Artificial Intelligence (cs.AI)
subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: Ontologies often require knowledge representation on multiple levels of abstraction, but description logics (DLs) are not well-equipped for supporting this. We propose an extension of DLs in which abstraction levels are first-class citizens and which provides explicit operators for the abstraction and refinement of concepts and roles across multiple abstraction levels, based on conjunctive queries. We prove that reasoning in the resulting family of DLs is decidable while several seemingly harmless variations turn out to be undecidable. We also pinpoint the precise complexity of our logics and several relevant fragments.
description: 25 pages, Long version of paper accepted at KR 2023
Contrastive Learning for Self-Supervised Pre-Training of Point Cloud Segmentation Networks With Image Data
Creators: name: Janda, Andrej
name: Wagstaff, Brandon
name: Ng, Edwin G.
name: Kelly, Jonathan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Reducing the quantity of annotations required for supervised training is vital when labels are scarce and costly. This reduction is particularly important for semantic segmentation tasks involving 3D datasets, which are often significantly smaller and more challenging to annotate than their image-based counterparts. Self-supervised pre-training on unlabelled data is one way to reduce the amount of manual annotations needed. Previous work has focused on pre-training with point clouds exclusively. While useful, this approach often requires two or more registered views. In the present work, we combine image and point cloud modalities by first learning self-supervised image features and then using these features to train a 3D model. By incorporating image data, which is often included in many 3D datasets, our pre-training method only requires a single scan of a scene and can be applied to cases where localization information is unavailable. We demonstrate that our pre-training approach, despite using single scans, achieves comparable performance to other multi-scan, point cloud-only methods.
description: In Proceedings of the Conference on Robots and Vision (CRV'23), Montreal, Canada, Jun. 6-8, 2023. arXiv admin note: substantial text overlap with arXiv:2211.11801
SUPPORTING STATEMENT (1).docx
Creators: name: Ojeniyi, Oyedele
Publisher: name: figshare
Year: 2022
Subjects: subject: Library and Information Studies
subject: FOS: Media and communications

description: YEAR 2022 WATCHWORD Behold, the LORD will do new things in my life, Now they shall spring forth, shall they not know it? The LORD will even make ways in my wilderness and rivers in my desert.  YEAR 2022 WATCHWORD Behold, the LORD will do new things in my life, Now they shall spring forth, shall they not know it? The LORD will even make ways in my wilderness and rivers in my desert.  YEAR 2022 WATCHWORD Behold, the LORD will do new things in my life, Now they shall spring forth, shall they not know it? The LORD will even make ways in my wilderness and rivers in my desert. 
The Parametric Generalized Fractional Nikiforov-Uvarov Method and Its Applications
Creators: name: Abu-shady, M.
name: Fath-Allah, H. M.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: By using generalized fractional derivative, the parametric generalized fractional Nikiforov-Uvarov (NU) method is introduced. The second-order parametric generalized differential equation is exactly solved in the fractional form. The obtained results are applied on the extended Cornell potential, the pesudoharmonic potential, the Mie potential, the Kratzer-Fues potential, the harmonic oscillator potential, the Morse potential, the Woods-Saxon potential, the Hulthen potential, the deformed Rosen-Morse potential and the Poschl-Teller potential which play an important role in the fields of molecular and hadron physics. The special classical cases are obtained from the fractional cases at ELFA = BETA =1 which are agreements with recent works.
description: 15 pages
Deep Reinforcement Learning for Concentric Tube Robot Path Following
Creators: name: Iyengar, Keshav
name: Spurgeon, Sarah
name: Stoyanov, Danail
Publisher: name: arXiv
Year: 2023
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: As surgical interventions trend towards minimally invasive approaches, Concentric Tube Robots (CTRs) have been explored for various interventions such as brain, eye, fetoscopic, lung, cardiac and prostate surgeries. Arranged concentrically, each tube is rotated and translated independently to move the robot end-effector position, making kinematics and control challenging. Classical model-based approaches have been previously investigated with developments in deep learning based approaches outperforming more classical approaches in both forward kinematics and shape estimation. We propose a deep reinforcement learning approach to control where we generalise across two to four systems, an element not yet achieved in any other deep learning approach for CTRs. In this way we explore the likely robustness of the control approach. Also investigated is the impact of rotational constraints applied on tube actuation and the effects on error metrics. We evaluate inverse kinematics errors and tracking error for path following tasks and compare the results to those achieved using state of the art methods. Additionally, as current results are performed in simulation, we also investigate a domain transfer approach known as domain randomization and evaluate error metrics as an initial step towards hardware implementation. Finally, we compare our method to a Jacobian approach found in literature.
description: 13 pages, 13 figures. Accepted to IEEE Transactions on Medical Robotics and Bionics Symposium Special Issue
Everything is Connected: Graph Neural Networks
Creators: name: Veličković, Petar
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: Social and Information Networks (cs.SI)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: In many ways, graphs are the main modality of data we receive from nature. This is due to the fact that most of the patterns we see, both in natural and artificial systems, are elegantly representable using the language of graph structures. Prominent examples include molecules (represented as graphs of atoms and bonds), social networks and transportation networks. This potential has already been seen by key scientific and industrial groups, with already-impacted application areas including traffic forecasting, drug discovery, social network analysis and recommender systems. Further, some of the most successful domains of application for machine learning in previous years -- images, text and speech processing -- can be seen as special cases of graph representation learning, and consequently there has been significant exchange of information between these areas. The main aim of this short survey is to enable the reader to assimilate the key concepts in the area, and position graph representation learning in a proper context with related fields.
description: To appear in Current Opinion in Structural Biology. 14 pages, 1 figure
POISSON project - III - Investigating the evolution of the mass accretion rate
Creators: name: Antoniucci, S.
name: Lopez, R. Garcia
name: Nisini, B.
name: Garatti, A. Caratti o
name: Giannini, T.
name: Lorenzetti, D.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: As part of the POISSON project (Protostellar Optical-Infrared Spectral Survey on NTT), we present the results of the analysis of low-resolution NIR spectra 0.9-2.4 um) of two samples of YSOs in Lupus and Serpens (52 and 17 objects), with masses 0.1-2.0 Msun and ages from 10^5 to a few 10^7 yr. After determining the accretion parameters of the Lup and Ser targets by analysing their HI near-IR emission features, we added the results to those from previous regions (investigated in POISSON with the same methodology). We obtained a final catalogue (143 objects) of mass accretion rates (Macc) derived in a homogeneous fashion and analysed how Macc correlates with M* and how it evolves in time. We derived the accretion luminosity (Lacc) and Macc for Lup and Ser objects from the Br_gamma line by using relevant empirical relationships from the literature that connect HI line luminosity and Lacc. To minimise the biases and also for self-consistency, we re-derived mass and age for each source using the same set of evolutionary tracks. We observe a correlation MaccM*^2.2, similarly to what has previously been observed in several star-forming clouds. The time variation of Macc is roughly consistent with the expected evolution in viscous disks, with an asymptotic decay that behaves as t^-1.6. However, Macc values are characterised by a large scatter at similar ages and are on average higher than the predictions of viscous models. Although part of the scattering may be related to the employed empirical relationship and to uncertainties on the single measurements, the general distribution and decay trend of the Macc points are real. These findings might be indicative of a large variation in the initial mass of the disks, of fairly different viscous laws among disks, of varying accretion regimes, and of other mechanisms that add to the dissipation of the disks, such as photo-evaporation.
description: 18 pages, 10 figures, accepted by A&A
Interrogating Quantum Nonlocal Effects in Nanoplasmonics through Electron-Beam Spectroscopy
Creators: name: Gonçalves, P. A. D.
name: de Abajo, F. Javier García
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: A rigorous account of quantum nonlocal effects is paramount for understanding the optical response of metal nanostructures and for designing plasmonic devices at the nanoscale. Here, we present a scheme for retrieving the quantum surface response of metals, encapsulated in the Feibelman $d$-parameters, from electron energy-loss spectroscopy (EELS) and cathodoluminescence (CL) measurements. We theoretically demonstrate that quantum nonlocal effects have a dramatic impact on EELS and CL spectra, in the guise of spectral shifts and nonlocal damping, when either the system size or the inverse wave vector in extended structures approach the nanometer scale. Our concept capitalizes on the unparalleled ability of free-electrons to supply deeply subwavelength near-fields and, thus, probe the optical response of metals at length scales in which quantum-mechanical effects are apparent. These results pave the way for a widespread use of the $d$-parameter formalism, thereby facilitating a rigorous yet practical inclusion of nonclassical effects in nanoplasmonics.
description: 8 pages, 4 figures
RGBlimp: Robotic Gliding Blimp -- Design, Modeling, Development, and Aerodynamics Analysis
Creators: name: Cheng, Hao
name: Sha, Zeyu
name: Zhu, Yongjian
name: Zhang, Feitian
Publisher: name: arXiv
Year: 2023
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: A miniature robotic blimp, as one type of lighter-than-air aerial vehicle, has attracted increasing attention in the science and engineering field for its long flight duration and safe aerial locomotion. While a variety of miniature robotic blimps have been developed over the past decade, most of them utilize the buoyant lift and neglect the aerodynamic lift in their design, thus leading to a mediocre aerodynamic performance. This letter proposes a new design of miniature robotic blimp that combines desirable features of both a robotic blimp and a fixed-wing glider, named the Robotic Gliding Blimp, or RGBlimp. This robot, equipped with an envelope filled with helium and a pair of wings, uses an internal moving mass and a pair of propellers for its locomotion control. This letter presents the design, dynamic modeling, prototyping, and system identification of the RGBlimp. To the best of the authors' knowledge, this is the first effort to systematically design and develop such a miniature robotic blimp with hybrid lifts and moving mass control. Experimental results are presented to validate the design and the dynamic model of the RGBlimp. Analysis of the RGBlimp aerodynamics is conducted which confirms the performance improvement of the proposed RGBlimp in aerodynamic efficiency and flight stability.
Precisely resolve energy-time entanglement by dual channel Fabry-Perot interferometry
Creators: name: Sun, Yuan
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Precisely resolving the continuous variable energy-time entanglement of paired photons is an important issue in quantum optics. The Fabry-Perot interferometer provides a distinguished opportunity for this purpose if the single photon pulse's self-interference is carefully avoided. A dual channel Fabry-Perot interferometer is proposed and studied with the focus put upon higher order quantum interference effects. When the two channels are properly set up, it is capable of resolving the energy-time entanglement in detail analogously to that a usual Fabry-Perot interferometer can resolve classical light's spectrum. Variation form of the dual channel Fabry-Perot interferometry is also discussed.
description: 4 figures
Initial Results from NuSTAR Observations of the Norma Arm
Creators: name: Bodaghee, Arash
name: Tomsick, John A.
name: Krivonos, Roman
name: Stern, Daniel
name: Bauer, Franz E.
name: Barriere, Nicolas
name: Boggs, Steven E.
name: Christensen, Finn E.
name: Craig, William W.
name: Gotthelf, Eric V.
name: Hailey, Charles J.
name: Harrison, Fiona A.
name: Hong, Jaesub
name: Mori, Kaya
name: Zhang, William W.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Results are presented for an initial survey of the Norma Arm gathered with the focusing hard X-ray telescope NuSTAR. The survey covers 0.2 deg$^2$ of sky area in the 3-79 keV range with a minimum and maximum raw depth of 15 ks and 135 ks, respectively. Besides a bright black-hole X-ray binary in outburst (4U 1630-47) and a new X-ray transient (NuSTAR J163433-473841), NuSTAR locates three sources from the Chandra survey of this region whose spectra are extended above 10 keV for the first time: CXOU J163329.5-473332, CXOU J163350.9-474638, and CXOU J163355.1-473804. Imaging, timing, and spectral data from a broad X-ray range (0.3-79 keV) are analyzed and interpreted with the aim of classifying these objects. CXOU J163329.5-473332 is either a cataclysmic variable or a faint low-mass X-ray binary. CXOU J163350.9-474638 varies in intensity on year-long timescales, and with no multi-wavelength counterpart, it could be a distant X-ray binary or possibly a magnetar. CXOU J163355.1-473804 features a helium-like iron line at 6.7 keV and is classified as a nearby cataclysmic variable. Additional surveys are planned for the Norma Arm and Galactic Center, and those NuSTAR observations will benefit from the lessons learned during this pilot study.
description: Accepted for publication in the Astrophysical Journal, 10 pages, 4 figures, 3 tables
Pressure-induced phase transition for single crystalline LaO0.5F0.5BiSe2
Creators: name: Fujioka, Masaya
name: Tanaka, Masashi
name: Denholme, Saleem J.
name: Yamaki, Takuma
name: Takeya, Hiroyuki
name: Yamaguchi, Takahide
name: Takano, Yoshihiko
Publisher: name: arXiv
Year: 2014
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We have demonstrated a pressure-induced phase transition from a low-Tc phase to a high-Tc phase in a single crystal of the superconductor LaO0.5F0.5BiSe2. The high-Tc phase appears at 2.16 GPa and the maximum superconducting transition temperature (Tc) is observed at 6.7 K under 2.44 GPa. Although the anisotropy (γ) for the low-Tc phase is estimated to be 20, it is reduced by around half (9.3) in the high-Tc phase. This tendency is the same for the BiS2 system. The Tc of LaO0.5F0.5BiSe2 has continued to increase up to the maximum pressure of this study (2.44 GPa). Therefore applied further pressure has the potential to induce a much higher Tc in this system.
description: 12 pages, 4 figures
Impact of street canyon morphology on heat and fluid flow-an experimental water tunnel study using simultaneous PIV-LIF technique
Creators: name: Xue, Yunpeng
name: Zhao, Yongling
name: Mei, Shuo-Jun
name: Chao, Yuan
name: Carmeliet, Jan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Urban areas are known for their complex atmospheric environments, with the building morphology having a significant impact on local climate patterns, air quality, and overall urban microclimate. Understanding the heat transport and fluid flow in complex urban environments is crucial for improving urban climate resilience, which remains an open frontier in the field of urban studies. To gain a more profound insight into the physical processes occurring in urban areas, particularly within street canyons, we conducted an experimental investigation in a large-scale water tunnel. This study involved the simultaneous examination of heat and flow fields, carried out at high spatial and temporal resolutions, utilizing Laser-induced Fluorescence (LIF) for heat analysis and Particle Image Velocimetry (PIV) for flow analysis. Our results of heat and flow in different street canyons indicate that the flow is significantly influenced by a combination of factors, including canyon configuration, the presence of buoyant force, and the magnitude of the approaching flow. The ventilation rate and heat flux from the street canyon, which are key factors shaping the urban microclimate, are found dominated significantly by the street canyon morphology. For instance, changing the aspect ratio of a street canyon results in a significant change of air ventilation rate, ranging from as low as 0.02 to as high as 1.5 under the same flow conditions. Additionally, canyons with high air ventilation rates exhibit significant heat flux removal at the canyon roof level, which is accurately described by the local Richardson number.
Schoenberg Correspondence for $k$-(Super)Positive Maps on Matrix Algebras
Creators: name: Bhat, B. V. Rajarama
name: Chakraborty, Purbayan
name: Franz, Uwe
Publisher: name: arXiv
Year: 2023
Subjects: subject: Functional Analysis (math.FA)
subject: Operator Algebras (math.OA)
subject: Quantum Physics (quant-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We prove a Schoenberg-type correspondence for non-unital semigroups which generalizes an analogous result for unital semigroup proved by Michael Schürmann. It characterizes the generators of semigroups of linear maps on $M_n(C)$ which are $k$-positive, $k$-superpositive, or $k$-entanglement breaking. As a corollary we reprove Lindblad, Gorini, Kossakowski, Sudarshan's theorem. We present some concrete examples of semigroups of operators and study how their positivity properties can improve with time.
description: 18 pages, v2 contains minor corrections. v3: parts of Section 2 moved to Sections 4 and 6, additional details are inserted in several proofs, and further minor corrections, v4 cibtains final minor corrections
Supplementary document for Quantifying polarization changes induced by rotating Dove prisms and K-mirrors - 6037044.pdf
Creators: name: Karan, Suman
name: ., Ruchi
name: Mohta, Pranay
name: Jha, Anand
Publisher: name: Optica Publishing Group
Year: 2022
Subjects: Uncategorized

description: Supplemental Document
Effect of the spin-orbit interaction on flows in heavy-ion collisions at intermediate energies
Creators: name: Guo, Chenchen
name: Wang, Yongjia
name: Li, Qingfeng
name: Zhang, Feng-Shou
Publisher: name: arXiv
Year: 2014
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The effect of the spin-orbit coupling in heavy ion collisions is investigated based on an updated version of the ultra-relativistic quantum molecular dynamics (UrQMD) model, in which the Skyrme potential energy density functional is employed. And in special, the spin-orbit coupling effects on the directed and elliptic flows of free nucleons emitted from $^{197}$Au+$^{197}$Au collisions as functions of both the beam energy and the impact parameter are studied. Our results show that the net contribution of the spin-orbit term to flows of nucleons is negligible, whereas a directed flow splitting between spin-up and spin-down nucleons is visible especially at large impact parameters and a peak of the splitting is found at the beam energy around 150 MeV$/$nucleon. We also found that the directed flow splitting between spin-up and spin-down neutrons is comparable with the neutron directed flow difference calculated by a soft and a stiff symmetry energy, indicating that the directed flow of neutrons cannot be used to pin down the stiffness of symmetry energy any more without considering the spin degree of freedom in models in case of spin polarization.
description: 15 pages, 5 figures, accepted by Phys. Rev. C
Lagrangian and Hamiltonian formulations of asymmetric rigid body, considered as a constrained system
Creators: name: Deriglazov, Alexei A.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Classical Physics (physics.class-ph)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: This work is devoted to a systematic exposition of the dynamics of a rigid body, considered as a system with kinematic constraints. Having accepted the variational problem in accordance with this, we no longer need any additional postulates or assumptions about the behavior of the rigid body. All the basic quantities and characteristics of a rigid body, as well as the equations of motion and integrals of motion, are obtained from the variational problem by direct and unequivocal calculations within the framework of standard methods of classical mechanics. Several equivalent forms for the equations of motion of rotational degrees of freedom are deduced and discussed on this basis. Using the resulting formulation, we revise some cases of integrability, and discuss a number of peculiar properties, that are not always taken into account when formulating the laws of motion of a rigid body.
description: 32 pages, 8 figures, discussions added, new section added: Chetaev bracket is the Dirac bracket. Matches with published version: A. A. Deriglazov, Eur. J. Phys. https://doi.org/10.1088/1361-6404/ace80d
Experimental study of developing free-falling annular flow in a large-scale vertical pipe
Creators: name: Xue, Yunpeng
name: Stewart, Colin
name: Kelly, David
name: Campbell, David
name: Gormley, Michael
Publisher: name: arXiv
Year: 2023
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Annular flow is the primary characteristic of unsteady wastewater flow, which initiates entrained air and sets up the air pressure regime within the system - an important design consideration. This paper reports on an experimental investigation of free-falling annular flow in a vertical pipe with different inlets at extended flow ranges up to Re = 3 x 10e4, similar to those in Building Drainage Systems (BDS). In the experimental setup, a vertical pipe system (5 m) was used to record velocity profiles and film thickness in the developing region through Particle Image Velocimetry (PIV) measurements. Entrained droplets were collected through a separator, and the entrainment fraction was calculated at different flow conditions. The study reports on the development process of the film velocity and thickness along the vertical pipe, which agrees well with empirical predictions. The results of the droplet entrainment of a vertical annular flow show the development process to the steady state. Additionally, a Tee-junction inlet in drainage system generates a higher and different entrainment profile.
D6.1: Tailoring of the controlling and monitoring tools for operations in shallow coastal waters
Creators: name: Notarstefano, Giulio
name: Pacciaroni, Massimo
name: Kassis, Dimitris
name: Palazov, Atanas
name: Slabakova, Violeta
name: Tuomi, Laura
name: Siiriä, Simo-Matti
name: Walczowski, Waldemar
name: Merchel, Małgorzata
name: Allen, John
name: Ruiz, Inmaculada
name: Diaz, Lara
name: Taillandier, Vincent
name: Arduini Plaisant, Luca
name: Cancouët, Romain
Publisher: name: Zenodo
Year: 2021

description: Report that details the existing Euro-Argo controlling and monitoring tools implemented, developed, tested and tailored for Argo float operations in shallow coastal areas of the Mediterranean, Black and Baltic Seas.
New action for simplicial gravity in four dimensions
Creators: name: Wieland, Wolfgang M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We develop a proposal for a theory of simplicial gravity with spinors as the fundamental configuration variables. The underlying action describes a mechanical system with finitely many degrees of freedom, the system has a Hamiltonian and local gauge symmetries. We will close with some comments on the resulting quantum theory, and explain the relation to loop quantum gravity and twisted geometries. The paper appears in parallel with an article by Cortês and Smolin, who study the relevance of the model for energetic causal sets and various other approaches to quantum gravity.
description: 26 pages, 2 figures
Probabilistic Q-function distributions in fermionic phase-space
Creators: name: Rosales-Zarate, Laura E. C.
name: Drummond, P. D.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We obtain a positive probability distribution or Q-function for an arbitrary fermionic many-body system. This is different to previous Q-function proposals, which were either restricted to a subspace of the overall Hilbert space, or used Grassmann methods that do not give probabilities. The fermionic Q-function obtained here is constructed using normally ordered Gaussian operators, which include both non-interacting thermal density matrices and BCS states. We prove that the Q-function exists for any density matrix, is real and positive, and has moments that correspond to Fermi operator moments. It is defined on a finite symmetric phase-space equivalent to the space of real, antisymmetric matrices. This has the natural SO(2M) symmetry expected for Majorana fermion operators. We show that there is a natural physical interpretation of the Q-function: it is the relative probability for observing a given Gaussian density matrix. The distribution has a uniform probability across the space at infinite temperature, while for pure states it has a maximum value on the phase-space boundary. The advantage of probabilistic representations is that they can be used for computational sampling without a sign problem.
QCD resummation of dijet azimuthal decorrelations in pp and pA collisions
Creators: name: Gao, Mei-Sen
name: Kang, Zhong-Bo
name: Shao, Ding Yu
name: Terry, John
name: Zhang, Cheng
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study the azimuthal angular decorrelations of dijet production in both proton-proton (pp) and proton-nucleus (pA) collisions. By utilizing soft-collinear effective theory, we establish the factorization and resummation formalism at the next-to-leading logarithmic accuracy for the azimuthal angular decorrelations in the back-to-back limit in pp collisions. We propose an approach where the nuclear modifications to dijet production in pA collisions are accounted for in the nuclear modified transverse momentum dependent parton distribution functions (nTMDPDFs), which contain both collinear and transverse dynamics. This approach naturally generalizes the well-established formalism related to the nuclear modified collinear parton distribution functions (nPDFs). We demonstrate strong consistency between our methodology and the CMS measurements in both pp and pA collisions, and make predictions for dijet production in the forward rapidity region in pA collisions at LHC kinematics and for mid-rapidity kinematics at sPHENIX. Throughout this paper, we focus on the application of this formalism to a simultaneous fit to both collinear and transverse momentum dependent contributions to the transverse momentum dependent distributions.
description: 26 pages, 6 figures
SUPPORTING STATEMENT.dox
Creators: name: Ojeniyi, Oyedele
Publisher: name: figshare
Year: 2022
Subjects: subject: Library and Information Studies
subject: FOS: Media and communications

description: YEAR 2022 WATCHWORD Behold, the LORD will do new things in my life, Now they shall spring forth, shall they not know it? The LORD will even make ways in my wilderness and rivers in my desert.  YEAR 2022 WATCHWORD Behold, the LORD will do new things in my life, Now they shall spring forth, shall they not know it? The LORD will even make ways in my wilderness and rivers in my desert.  YEAR 2022 WATCHWORD Behold, the LORD will do new things in my life, Now they shall spring forth, shall they not know it? The LORD will even make ways in my wilderness and rivers in my desert. 
Therapeutic Effect of Xagrotin Against SARS-CoV-2: In silico, In vitro, In Vivo, and Clinical Trial Study
Creators: name: Hosseini, seyed Mohammad
name: Moradi-sardareh, Hemen
name: Karim, Dana Omar
name: Ahmed, Sabah Nasraddin
name: Nabi, Hersh Salim
name: abdullah, Hadi Mohammed
name: Adar, Mamad
Publisher: name: figshare
Year: 2022
Subjects: subject: 110801 Medical Bacteriology
subject: FOS: Health sciences

description: Background: The Covid-19 disease threatens the lives of many people. We prepare an herbal supplement that improve the condition of patients and reduce the mortality rate. Method: We prepared a combined drug, Xagrotin, from 6 plants with therapeutic properties against viruses and infectious lung diseases. The ingredients of Xagrotin were evaluated by HPLC, ICP, and GC-MS. Then, their effects were evaluated by In-Silico, In-Vivo, and clinical trial studies. Results: The Xagrotin extract was rich in fat-/water-soluble vitamins and many antiviral phytochemical compounds. Four ligands of this extract bind to spike receptor-binding domain and main protease of Coronavirus. Extraction shows no significant toxicity on HFF-2 normal cells and confirmed by In-Vivo study. The clinical trial results confirm therapeutic effects of Xagrotin on patients with Covid-19. It decreases the rate of motility and hospitalization, Duration of disease and hospitalization, and the severity of disease and accelerates the recovery of symptoms. Conclusion: It is suggested that Xagrotin could be a potentially useful drug in the treatment of viral and pulmonary infections, especially Covid-19.
A new recurrence formula for generic exceptional orthogonal polynomials
Creators: name: Miki, Hiroshi
name: Tsujimoto, Satoshi
Publisher: name: arXiv
Year: 2014
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 33C45, 33C47, 42C05

description: A new recurrence relation for exceptional orthogonal polynomials is proposed, which holds for type 1, 2 and 3. As concrete examples, the recurrence relations are given for Xj-Hermite, Laguerre and Jacobi polynomials in j = 1,2 case.
description: 17 pages, 4 figures
A Within-Year Growth Model Approach to Forecasting Corn Yields
Creators: name: House, Carol C.
name: House, Carol C.
Publisher: name: Unknown
Year: 1977
Subjects: Crop Production/Industries
Productivity Analysis
Research Methods/ Statistical Methods

description: Excerpt from the report Introduction: The 1976 Corn Growth Research Project was carried out as part of the continuing effort to develop feasible within-year forecasting techniques. The objectives of this paper are to: 1) Discuss the form of the logistic growth model and its applicability to forecasting corn yields. 2) Describe the sampling, data collection and data handling techniques involved in the 1976 Corn Research Projects. 3) Discuss the analysis that was performed on this data. This discussion will include: a) The performance of the logistic model and two homoscedastic modifications when fitted using 1976 corn growth data from Iowa and Texas. b) The use of simulated growth data to observe various model characteristics. c) The use of the logistic model to forecast plant survival. 4) Make recommendations for future research.
SUPPORTING STATEMENT.docx
Creators: name: Ojeniyi, Oyedele
Publisher: name: figshare
Year: 2022
Subjects: subject: Library and Information Studies
subject: FOS: Media and communications

description: YEAR 2022 WATCHWORD Behold, the LORD will do new things in my life, Now they shall spring forth, shall they not know it? The LORD will even make ways in my wilderness and rivers in my desert.  YEAR 2022 WATCHWORD Behold, the LORD will do new things in my life, Now they shall spring forth, shall they not know it? The LORD will even make ways in my wilderness and rivers in my desert.  YEAR 2022 WATCHWORD Behold, the LORD will do new things in my life, Now they shall spring forth, shall they not know it? The LORD will even make ways in my wilderness and rivers in my desert. 