cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Quantum-enhanced Doppler lidar
Creators: name: Reichert, Maximilian
name: Di Candia, Roberto
name: Win, Moe Z.
name: Sanz, Mikel
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a quantum-enhanced lidar system to estimate a target's radial velocity which employs squeezed and frequency entangled signal and idler beams. We compare its performance against a classical protocol using a coherent state with the same pulse duration and energy, showing that quantum resources provide a precision enhancement in the estimation of the velocity of the object. We identify three distinct parameter regimes characterized by the amount of squeezing and frequency entanglement. In two of them, a quantum advantage exceeding the standard quantum limit is achieved assuming no photon losses. Additionally, we show that an optimal measurement to attain these results in the lossless case is frequency-resolved photon counting. Finally, we consider the effect of photon losses for the high-squeezing regime, which leads to a constant factor quantum advantage higher than $3$ dB in the variance of the estimator, given a roundtrip lidar-to-target-to-lidar transmissivity larger than $50\%$.
Schrieffer-Wolff Transformations for Experiments: Dynamically Suppressing Virtual Doublon-Hole Excitations in a Fermi-Hubbard Simulator
Creators: name: Kale, Anant
name: Huhn, Jakob Hendrik
name: Xu, Muqing
name: Kendrick, Lev Haldar
name: Lebrat, Martin
name: Chiu, Christie
name: Ji, Geoffrey
name: Grusdt, Fabian
name: Bohrdt, Annabelle
name: Greiner, Markus
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In strongly interacting systems with a separation of energy scales, low-energy effective Hamiltonians help provide insights into the relevant physics at low temperatures. The emergent interactions in the effective model are mediated by virtual excitations of high-energy states: For example, virtual doublon-hole excitations in the Fermi-Hubbard model mediate antiferromagnetic spin-exchange interactions in the derived effective model, known as the $t-J-3s$ model. Formally this procedure is described by performing a unitary Schrieffer-Wolff basis transformation. In the context of quantum simulation, it can be advantageous to consider the effective model to interpret experimental results. However, virtual excitations such as doublon-hole pairs can obfuscate the measurement of physical observables. Here we show that quantum simulators allow one to access the effective model even more directly by performing measurements in a rotated basis. We propose a protocol to perform a Schrieffer-Wolff transformation on Fermi-Hubbard low-energy eigenstates (or thermal states) to dynamically prepare approximate $t-J-3s$ model states using fermionic atoms in an optical lattice. Our protocol involves performing a linear ramp of the optical lattice depth, which is slow enough to eliminate the virtual doublon-hole fluctuations but fast enough to freeze out the dynamics in the effective model. We perform a numerical study using exact diagonalization and find an optimal ramp speed for which the state after the lattice ramp has maximal overlap with the $t-J-3s$ model state. We compare our numerics to experimental data from our Lithium-6 fermionic quantum gas microscope and show a proof-of-principle demonstration of this protocol. More generally, this protocol can be beneficial to studies of effective models by enabling the suppression of virtual excitations in a wide range of quantum simulation experiments.
description: 18 pages, 4 figures. Updated author list, and revised figures to meet submission guidelines
Discovery of H2O Megamasers in Obscured Active Galactic Nuclei
Creators: name: Yamauchi, Aya
name: Miyamoto, Yusuke
name: Nakai, Naomasa
name: Terashima, Yuichi
name: Okumura, Taishi
name: Zhou, Bin
name: Taniguchi, Kotomi
name: Kaneko, Hiroyuki
name: Matsumoto, Naoko
name: Salak, Dragan
name: Nishimura, Atsushi
name: Ueno, Saeko
Publisher: name: arXiv
Year: 2017
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Recently a new method to discover obscured active galactic nuclei (AGNs) by utilizing X-ray and Infrared data has been developed. We carried out a survey of H2O maser emission toward ten obscured AGNs with the Nobeyama 45-m telescope. We newly detected the maser emission with the signal-noise-ratio (SNR) of above 4 from two AGNs, NGC 1402 and NGC 7738. We also found a tentative detection with its SNR > 3 in NGC 5037. The detection rate of 20% is higher than those of previous surveys (usually several percents).
description: 5 pages, 1 figures, 3 tables, accepted for publication in PASJ
Scaling of Fock-space propagator and multifractality across the many-body localization transition
Creators: name: Sutradhar, Jagannath
name: Ghosh, Soumi
name: Roy, Sthitadhi
name: Logan, David E.
name: Mukerjee, Subroto
name: Banerjee, Sumilan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We implement a recursive Green function method to extract the Fock space (FS) propagator and associated self-energy across the many-body localization (MBL) transition, for one-dimensional interacting fermions in a random onsite potential. We show that the typical value of the imaginary part of the local FS self-energy, Δ_t, related to the decay rate of an initially localized state, acts as a probabilistic order parameter for the thermal to MBL phase transition; and can be used to characterize critical properties of the transition as well as the multifractal nature of MBL states as a function of disorder strength W. In particular, we show that a fractal dimension D_s extracted from Δ_t jumps discontinuously across the transition, from D_s<1 in the MBL phase to D_s= 1 in the thermal phase. Moreover, Δ_t follows an asymmetrical finite-size scaling form across the thermal-MBL transition, where a non-ergodic volume in the thermal phase diverges with a Kosterlitz-Thouless like essential singularity at the critical point W_c, and controls the continuous vanishing of Δ_t as W_c is approached. In contrast, a correlation length (ξ) extracted from Δ_t exhibits a power-law divergence on approaching W_c from the MBL phase.
Spherical model with Dzyaloshinskii-Moriya interactions
Creators: name: de Castilho, William
name: Salinas, S. R.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We analyze the thermodynamic behavior of a ferromagnetic mean-spherical model with three distinct spin components and the addition of Dzyaloshinkii-Moriya interactions. Exact calculations are performed for classical and quantum versions of this lattice model system. We show the onset of space modulated structures at low temperatures.
Image sensor array based on graphene-CMOS integration
Creators: name: Goossens, Stijn
name: Navickaite, Gabriele
name: Monasterio, Carles
name: Gupta, Shuchi
name: Piqueras, Juan José
name: Pérez, Raúl
name: Burwell, Gregory
name: Nikitskiy, Ivan
name: Lasanta, Tania
name: Galán, Teresa
name: Puma, Eric
name: Centeno, Alba
name: Pesquera, Amaia
name: Zurutuza, Amaia
name: Konstantatos, Gerasimos
name: Koppens, Frank
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Integrated circuits based on CMOS (complementary metal-oxide semiconductors) are at the heart of the technological revolution of the past 40 years, as these have enabled compact and low cost micro-electronic circuits and imaging systems. However, the diversification of this platform into applications other than microcircuits and visible light cameras has been impeded by the difficulty to combine other semiconductors than silicon with CMOS. Here, we show for the first time the monolithic integration of a CMOS integrated circuit with graphene, operating as a high mobility phototransistor. We demonstrate a high-resolution image sensor and operate it as a digital camera that is sensitive to UV, visible and infrared light. The demonstrated graphene-CMOS integration is pivotal for incorporating 2d materials into the next generation microelectronics, sensor arrays, low-power integrated photonics and CMOS imaging systems covering visible, infrared and even terahertz frequencies.. The demonstrated graphene-CMOS integration is pivotal for incorporating 2d materials into the next generation microelectronics, sensor arrays, low-power integrated photonics and CMOS imaging systems covering visible, infrared and even terahertz frequencies.
description: 11 pages, 4 figures
Effects of photon field on entanglement generation in charged particles
Creators: name: Sugiyama, Yuuki
name: Matsumura, Akira
name: Yamamoto, Kazuhiro
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The Bose-Marletto-Vedral (BMV) experiment [3, 4] is a proposal for testing the quantum nature of gravity with entanglement due to Newtonian gravity. This proposal has stimulated controversy on how the entanglement due to Newtonian gravity is related to the essence of quantum gravity and the existence of gravitons. Motivated by this, we analyze the entanglement generation between two charged particles coupled to a photon field. We assume that each particle is in a superposition of two trajectories and that the photon field is initially in a coherent state. Based on covariant quantum electrodynamics, the formula for the entanglement negativity of the charged particles is derived for the first time. Adopting simple analytic trajectories of the particles, we demonstrate the entanglement between them. It is observed that the entanglement is suppressed by the decoherence due to the vacuum fluctuations of the photon field. We also find that the effect of quantum superposition of bremsstrahlung appears in the entanglement negativity formula. The similar structures between the gravity theory and electromagnetic theory suggests that a similar feature may be observed in the entanglement generation by quantum gravitational radiation.
description: 34 pages, 16 figures
Navy Unaccompanied Personnel Housing During the Cold War (1946-1989), Site Report: Naval Installations in the Hampton Roads Area, Virginia (Naval Station Norfolk, Naval Amphibious Base Little Creek, Naval Air Station Oceana, and Dam Neck Annex
Creators: name: Dixon, Kathryn G.
name: Crosby, Melissa
name: Doerrfeld, Dean A.
name: Gatewood, Rebecca
Publisher: name: R. Christopher Goodwin & Asscociates, Inc.
Year: 2008
Subjects: subject: Virginia (State / Territory)
valueUri: https://core.tdar.org/browse/geographic-keyword/1474/virginia-state-territory
subject: Hampton Roads
valueUri: https://core.tdar.org/browse/geographic-keyword/85953/hampton-roads
subject: Cold War Era
valueUri: https://core.tdar.org/browse/temporal-keyword/5551/cold-war-era
subject: Cold War
valueUri: https://core.tdar.org/browse/temporal-keyword/7288/cold-war
subject: Dam Neck Annex
valueUri: https://core.tdar.org/browse/other-keyword/167997/dam-neck-annex
subject: Site Report
valueUri: https://core.tdar.org/browse/other-keyword/78207/site-report
subject: Housing
valueUri: https://core.tdar.org/browse/other-keyword/31892/housing
subject: Naval Amphibious Base Little Creek
valueUri: https://core.tdar.org/browse/other-keyword/167995/naval-amphibious-base-little-creek
subject: Naval Air Station Oceana
valueUri: https://core.tdar.org/browse/other-keyword/167996/naval-air-station-oceana
subject: Naval Station Norfolk
valueUri: https://core.tdar.org/browse/other-keyword/167994/naval-station-norfolk
subject: Architectural Documentation
valueUri: https://core.tdar.org/browse/investigation-type/16/architectural-documentation
subject: Heritage Management
valueUri: https://core.tdar.org/browse/investigation-type/24/heritage-management

description: Draft report on the Department of the Navy compliance study for the Program Comment for Cold War Era Unaccompanied Personnel Housing (1949-1974). This report provides documentation on four Naval installations located in the Hampton Roads area of Virginia: Naval Station Norfolk, Naval Amphibious Base Little Creek, Naval Air Station Oceana, and Dam Neck Annex. This study examines the creation of the installations and provides representative samples of UPH and ancillary structures constructed and/or modified during the Cold War Era.
Bootstrap methods in bounding discrete Radon operators
Creators: name: Słomian, Wojciech
Publisher: name: arXiv
Year: 2022
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 42B25(Primary), 42B15(Secondary)

description: The aim of this paper is to develop bootstrap arguments to establish maximal, oscillation, variational and jump inequalities for the discrete averaging Radon operators on $\ell^p(\mathbb Z^d)$.
Cold War Needs Assessment
Creators: name: Peyton, Paige M.
name: Urbas, Andrea
Publisher: name: Earth Tech, Inc.
Year: 2001
Subjects: subject: Cold War Era
valueUri: https://core.tdar.org/browse/temporal-keyword/5551/cold-war-era
subject: Cold War
valueUri: https://core.tdar.org/browse/temporal-keyword/7288/cold-war
subject: Legacy Program
valueUri: https://core.tdar.org/browse/other-keyword/116305/legacy-program
subject: Needs Assessment
valueUri: https://core.tdar.org/browse/other-keyword/166514/needs-assessment
subject: Architectural Documentation
valueUri: https://core.tdar.org/browse/investigation-type/16/architectural-documentation
subject: Historic Background Research
valueUri: https://core.tdar.org/browse/investigation-type/18/historic-background-research
subject: Architectural Survey
valueUri: https://core.tdar.org/browse/investigation-type/2/architectural-survey
subject: Heritage Management
valueUri: https://core.tdar.org/browse/investigation-type/24/heritage-management

description: The assessment provided herein includes a review of the methods used in 11 completed interservice Cold War building and structure evaluations (Air Force, Navy, and Army). Along with other studies currently being conducted (e.g., preparation of a comprehensive Cold War historic context), this document will support the ongoing development and refinement of the Air Force’s guidance for the evaluation of Cold War resources.
First-principles LCPAO Approach for Insulators under Finite Electric Field
Creators: name: Yamaguchi, Naoya
name: Ishii, Fumiyuki
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We propose a linear-combination-of-pseudo-atomic-orbitals scheme for a finite electric field method based on the modern theory of polarization. We derive the matrix elements of the effective potential for the field and the corresponding terms of the forces on atoms. In addition, we successfully evaluated the dielectric constants and Born effective charges of typical semiconducting and insulating materials. Our formalism will aid in the study of materials under electric fields.
description: 16 pages, 1 figure; resolved typographical errors; additionally written
Abrupt transitions in turbulent thermoacoustic systems
Creators: name: Bhavi, Ramesh S.
name: Pavithran, Induja
name: Roy, Amitesh
name: Sujith, R. I.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Abrupt transitions to the state of thermoacoustic instability (TAI) in gas turbine combustors are a significant challenge plaguing the development of next-generation low-emission aircraft and power generation engines. In this paper, we present the observation of abrupt transition in three disparate turbulent thermoacoustic systems: an annular combustor, a swirl-stabilized combustor, and a preheated bluff-body stabilized combustor. Using a low-order stochastic thermoacoustic model, we show that the reported abrupt transitions occur when an initially stable, supercritical limit cycle becomes unstable, leading to a secondary bifurcation to a large amplitude limit cycle solution. The states of combustion noise and intermittency observed in these turbulent combustors are well captured by the additive stochastic noise in the model. Through amplitude reduction, we analyze the underlying potential functions affecting the stability of the observed dynamical states. Finally, we make use of the Fokker-Planck equation, educing the effect of stochastic fluctuations on subcritical and secondary bifurcation. We conclude that a high enough intensity of stochastic fluctuations which transforms a subcritical bifurcation into an intermittency-facilitated continuous transition may have little effect on the abrupt nature of secondary bifurcation. Our findings imply the high likelihood of abrupt transitions in turbulent combustors possessing higher-order nonlinearities where turbulence intensities are disproportionate to the large amplitude limit cycle solution.
Corrections to Newton's law of gravitation in the context of codimension-1 warped thick braneworlds
Creators: name: Veras, D. F. S.
name: Almeida, C. A. S.
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this work, we compute the corrections in the Newton's law of gravitation due to Kaluza-Klein gravitons in codimension-1 warped thick braneworld scenarios. We focus in some models recently proposed in the literature, the so-called asymmetric hybrid brane and compact brane. Such models are deformations of the $ϕ^4$ and sine-Gordon topological defects, respectively. Therefore we consider the branes engendered by such defects and we also compute the corrections in their cases. We use suitable numerical techniques to attain the mass spectrum and its corresponding eigenfunctions which are the essential quantities for computing the correction to the Newtonian potential. Moreover, we discuss that the existence of massive modes is necessary for building a braneworld model with a phenomenology involved. We find that the odd eigenfunctions have non-trivial contributions and the first eigenstate of the Kaluza-Klein tower has the highest contribution. The calculation of slight deviations in the gravitational potential may be used as a selection tool for braneworld scenarios matching with future experimental measurements in high energy collisions.
description: 24 pages, 15 figures. Replaced in order to match the modified version accepted to PRD. Minor text modifications
This Is the Moment for Probabilistic Loops
Creators: name: Moosbrugger, Marcel
name: Stankovič, Miroslav
name: Bartocci, Ezio
name: Kovács, Laura
Publisher: name: arXiv
Year: 2022
Subjects: subject: Programming Languages (cs.PL)
subject: FOS: Computer and information sciences

description: We present a novel static analysis technique to derive higher moments for program variables for a large class of probabilistic loops with potentially uncountable state spaces. Our approach is fully automatic, meaning it does not rely on externally provided invariants or templates. We employ algebraic techniques based on linear recurrences and introduce program transformations to simplify probabilistic programs while preserving their statistical properties. We develop power reduction techniques to further simplify the polynomial arithmetic of probabilistic programs and define the theory of moment-computable probabilistic loops for which higher moments can precisely be computed. Our work has applications towards recovering probability distributions of random variables and computing tail probabilities. The empirical evaluation of our results demonstrates the applicability of our work on many challenging examples.
description: Published at OOPSLA 2022
Electron transfer under the Floquet modulation in donor-bridge-acceptor systems
Creators: name: Su, Yu
name: Chen, Zi-Hao
name: Zhu, Haojie
name: Wang, Yao
name: Han, Lu
name: Xu, Rui-Xue
name: Yan, YiJing
Publisher: name: arXiv
Year: 2022
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Electron transfer (ET) processes are of broad interest in modern chemistry. With the advancements of experimental techniques, one may modulate the ET via such as the light-matter interactions. In this work, we study the ET under a Floquet modulation occurring in the donor-bridge-acceptor systems, with the rate kernels projected out from the exact disspaton equation of motion formalism. This together with the Floquet theorem enables us to investigate the interplay between the intrinsic non-Markovianity and the driving periodicity. The observed rate kernel exhibits a Herzberg-Teller-like mechanism induced by the bridge fluctuation subject to effective modulation.
description: 10 pages, 6 figures
Families of stable solitons and excitations in the PT-symmetric nonlinear Schrodinger equations with position-dependent effective masses
Creators: name: Chen, Yong
name: Yan, Zhenya
name: Mihalache, Dumitru
name: Malomed, Boris A.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: Mathematical Physics (math-ph)
subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Since the parity-time-(PT-) symmetric quantum mechanics was put forward, fundamental properties of some linear and nonlinear models with PT-symmetric potentials have been investigated. However, previous studies of PT-symmetric waves were limited to constant diffraction coefficients in the ambient medium. Here we address effects of variable diffraction coefficient on the beam dynamics in nonlinear media with generalized $\mathcal{PT}$-symmetric Scarf-II potentials. The broken linear PT symmetry phase may enjoy a restoration with the growing diffraction parameter. Continuous families of one- and two-dimensional solitons are found to be stable. Particularly, some stable solitons are analytically found. The existence range and propagation dynamics of the solitons are identified. Transformation of the solitons by means of adiabatically varying parameters, and collisions between solitons are studied too. We also explore the evolution of constant-intensity waves in a model combining the variable diffraction coefficient and complex potentials with globally balanced gain and loss, which are more general than PT-symmetric ones, but feature similar properties. Our results may suggest new experiments for PT-symmetric nonlinear waves in nonlinear nonuniform optical media.
description: 22 pages, 14 figures (Scientific Reports, in press)
Air Force and Navy Unaccompanied Personnel Housing During the Cold War Era (1946-1989), Draft Report
Creators: name: Heidenrich, Christine
name: Doerrfeld, Dean A.
name: Gatewood, Rebecca
Publisher: name: R. Christopher Goodwin & Asscociates, Inc.
Year: 2008
Subjects: subject: Cold War Era
valueUri: https://core.tdar.org/browse/temporal-keyword/5551/cold-war-era
subject: Cold War
valueUri: https://core.tdar.org/browse/temporal-keyword/7288/cold-war
subject: NRHP
valueUri: https://core.tdar.org/browse/other-keyword/9857/nrhp
subject: National Register of Historic Places
valueUri: https://core.tdar.org/browse/other-keyword/1572/national-register-of-historic-places
subject: Housing
valueUri: https://core.tdar.org/browse/other-keyword/31892/housing
subject: Architectural Documentation
valueUri: https://core.tdar.org/browse/investigation-type/16/architectural-documentation
subject: Architectural Survey
valueUri: https://core.tdar.org/browse/investigation-type/2/architectural-survey
subject: Heritage Management
valueUri: https://core.tdar.org/browse/investigation-type/24/heritage-management

description: This study was prepared by the Department of the Navy and the Department of the Air Force to meet the compliance requirement associated with the Program Comment for Unaccompanied Personnel Housing (1946-1974), issued by the Advisory Council on Historic Preservation on August 18, 2006. A programmatic treatment for the properties was developed in compliance with Section 106 of the National Historic Preservation Act of 1966 (NHPA), as amended, to take into consideration the effects of future management activities upon this class of Navy and Air Force resources constructed between 1946 and 1974, which might be historic. This is a draft report.
High-field magnetoresistance of microcrystalline and nanocrystalline Ni metal at 3 K and 300 K
Creators: name: Bakonyi, I.
name: Czeschka, F. D.
name: Kiss, L. F.
name: Isnaini, V. A.
name: Krupp, A. T.
name: Palotás, K.
name: Zsurzsa, S.
name: Péter, L.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The magnetoresistance (MR) and the magnetization isotherms were studied up to high magnetic fields at T = 3 K and 300 K for a microcrystalline ($μ$c) Ni foil corresponding to bulk Ni and for a nanocrystalline (nc) Ni foil. At T = 3 K, for the $μ$c-Ni sample with a residual resistivity ratio (RRR) of 331, the field dependence of the resistivity was similar to what was reported previously for high-purity ferromagnets whereas the MR(H) behavior for the nc-Ni sample with RRR = 9 resembled that what was observed at low temperatures for Ni-based alloys with low impurity concentration. In the magnetically saturated state, the resistivity increased with magnetic field for both samples at T = 3 K and the field dependence was dominated by the ordinary MR due to the Lorentz force acting on the electron trajectories. However, the MR(H) curves were found to be saturating for $μ$c-Ni and non-saturating for nc-Ni, the difference arising from their very different electron mean free paths. At T = 300 K, the MR(H) curves of both Ni samples were very similar to those known for bulk Ni. After magnetic saturation, the resistivity decreased nearly linearly with magnetic field which behavior is due to the suppression of thermally-induced magnetic disorder with increasing magnetic field. The MR(H) data were analyzed at both temperatures with the help of Kohler plots from which the resistivity anisotropy splitting ($Δρ_{AMR}$) and the anisotropic magnetoresistance (AMR) ratio were derived. It was demonstrated that at T = 300 K, $ρ(H\rightarrow 0)=ρ(B\rightarrow 0)$ due to the negligible contribution of the ordinary MR. The data for the two Ni samples at 3 K and 300 K were found to indicate an approximately linear scaling of $Δρ_{AMR}$ with the zero-field resistivity. This implies that the AMR ratio does not vary significantly with temperature in either microstructural state of Ni.
description: 57 pages, 19 figures
Parity anomaly in four dimensions
Creators: name: Kurkov, M.
name: Vassilevich, D.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In an analogy to the odd-dimensional case we define the parity anomaly as the part of the one-loop effective action for fermions associated with spectral asymmetry of the Dirac operator. This quantity is computed directly on four-dimensional manifolds with boundary and related to the Chern-Simons current on the boundary. Despite a quite unusual Chern-Simons level obtained, the action is gauge invariant and passes all consistency checks.
description: Revtex, 7 pp V2: added remarks and references
Air Education and Training Command: Training the Peacemakers during the Cold War Era (1945-1991)
Creators: name: Prior, Marsha
name: Salo, Edward
Publisher: name: Geo-Marine, Inc.
Year: 2003
Subjects: subject: Cold War Era
valueUri: https://core.tdar.org/browse/temporal-keyword/5551/cold-war-era
subject: Cold War
valueUri: https://core.tdar.org/browse/temporal-keyword/7288/cold-war
subject: NRHP
valueUri: https://core.tdar.org/browse/other-keyword/9857/nrhp
subject: Air Education and Training Command
valueUri: https://core.tdar.org/browse/other-keyword/153395/air-education-and-training-command
subject: NRHP Eligibility
valueUri: https://core.tdar.org/browse/other-keyword/42963/nrhp-eligibility
subject: Peacemakers
valueUri: https://core.tdar.org/browse/other-keyword/167969/peacemakers
subject: National Register of Historic Places
valueUri: https://core.tdar.org/browse/other-keyword/1572/national-register-of-historic-places
subject: Historic Background Research
valueUri: https://core.tdar.org/browse/investigation-type/18/historic-background-research
subject: Heritage Management
valueUri: https://core.tdar.org/browse/investigation-type/24/heritage-management

description: This report provides a national historic context for the Cold War (1945–1991) material culture associated with Air Training Command and Air University—the two Major Commands that now constitute the modern-day United States Air Force Air Education and Training Command (AETC). This work was performed to assist the USAF in meeting the requirements of the National Environmental Policy Act and Section 110 of the National Historic Preservation Act, as amended.
Designing FDA Radars Robust to Contaminated Shared Spectra
Creators: name: Jia, Wenkai
name: Jakobsson, Andreas
name: Wang, Wen-Qin
Publisher: name: arXiv
Year: 2022
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper considers the problem of jointly designing the transmit waveforms and weights for a frequency diverse array (FDA) in a spectrally congested environment in which unintentional spectral interferences exist. Exploiting the properties of the interference signal induced by the processing of the multi-channel mixing and low-pass filtering FDA receiver, the interference covariance matrix structure is derived. With this, the receive weights are formed using the minimum variance distortionless response (MVDR) method for interference cancellation. Owing to the fact that the resulting output signal-to-interference-plus-noise ratio (SINR) is a function of the transmit waveforms and weights, as well as due to the ever-greater competition for the finite available spectrum, a joint design scheme for the FDA transmit weights and the spectrally compatible waveforms is proposed to efficiently use the available spectrum while maintaining a sufficient receive SINR. The performance of the proposed technique is verified using numerical simulations in terms of the achievable SINR, spectral compatiblity, as well as several aspects of the synthesized waveforms.
description: 13 pages, 14 figures
Intelligent Eyes for Smart Security Environments
Creators: name: Aravind N.
name: Sandeep B.
name: Daya N.
Publisher: name: gjrpublication
Year: 2024

description: Human motion detection and prediction have become pivotal fields in computer vision and artificial intelligence, revolutionizing applications ranging from surveillance and robotics to healthcare and interactive technologies. The ability to perceive and anticipate human movements is crucial for developing intelligent systems that can seamlessly interact with the physical world and enhance overall user experience. Predicting environmental human motion involves forecasting future positions, poses, or actions of individuals based on their past movements. In this comprehensive review, various approaches and techniques for human motion detection and prediction are explored. The methods used, major challenges and considerations for different approaches are highlighted. Although various methods are used in the detection and prediction of human motion, neural networks and deep learning have transformed the landscape of human motion detection and prediction, enabling the development of accurate and versatile models. With ongoing research, the integration of emerging architectures, attention mechanisms, and multi-modal approaches is expected to further enhance the capabilities of these models across a wide range of applications.
Relativistic and QED corrections to one-bond indirect nulcear spin-spin couplings in X$_2^{2+}$ and X$_3^{2+}$ ions (X = Zn, Cd, Hg)
Creators: name: Jofré, Mariano Colombo
name: Kozioł, Karol
name: Aucar, I. Agustín
name: Gaul, Konstantin
name: Berger, Robert
name: Aucar, Gustavo A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The indirect nuclear spin-spin coupling tensor, $\mathbf J$, between mercury nuclei in Hg-containing systems can be of the order of few kHz and one of the largest measured. We conduct an analysis of the physics behind the electronic mechanisms that contribute to the one- and two-bond couplings $^n {\mathbf J}_{\mathrm{Hg}-\mathrm{Hg}}$ ($n=1, 2$). We performed calculations for $J$-couplings in X$_2^{2+}$ and $X_3^{2+}$ ions ($X$ = Zn, Cd, Hg), within polarization propagator theory, using the random phase approximation (RPA) and the pure zeroth order approximation (PZOA), with Dirac-Hartree-Fock (DHF) and Dirac-Kohn-Sham (DKS) orbitals, both at four-component and ZORA levels. We show that the "paramagnetic-like" mechanism contribute with more than 99.98\% to the total isotropic component of the coupling tensor. By means of an analysis of the molecular and atomic orbitals involved in the total value of the response function, we find that the $s$-type valence atomic orbitals have a predominant role in the description of the coupling. This fact allows us to develop an effective model from which quantum electrodynamics (QED) effects on $J$-coupling in the aforementioned ions can be estimated. The estimated QED corrections were found in the interval $(0.7; ~ 1.7)$\% of the total relativistic effect on isotropic one-bond $^1 {\mathbf J}$ coupling and from the interval $(-0.2; ~ -0.4)$\%, in Zn-containing ions, to $(-0.8; ~ -1.2)$\%, in Hg-containing ions, of the total isotropic coupling constant in the studied systems. We also show that estimated QED corrections cast a visible dependence on the nuclear charge $Z$ of each atom $X$ in the form of a power-law $\propto Z^5$.
description: 15 pages, 6 figures
Navy Unaccompanied Personnel Housing During the Cold War (1946-1989) Site Report: Naval Air Station, North Island, California and Naval Amphibious Base, Coronado California
Creators: name: Gatewood, Rebecca
name: Doerrfeld, Dean A.
Publisher: name: R. Christopher Goodwin & Associates, Inc.
Year: 2008
Subjects: subject: Coronado, California
valueUri: https://core.tdar.org/browse/geographic-keyword/85949/coronado-california
subject: Naval Air Station, North Island
valueUri: https://core.tdar.org/browse/geographic-keyword/85511/naval-air-station-north-island
subject: California (State / Territory)
valueUri: https://core.tdar.org/browse/geographic-keyword/1484/california-state-territory
subject: Cold War Era
valueUri: https://core.tdar.org/browse/temporal-keyword/5551/cold-war-era
subject: Cold War
valueUri: https://core.tdar.org/browse/temporal-keyword/7288/cold-war
subject: Housing
valueUri: https://core.tdar.org/browse/other-keyword/31892/housing
subject: Architectural Documentation
valueUri: https://core.tdar.org/browse/investigation-type/16/architectural-documentation
subject: Heritage Management
valueUri: https://core.tdar.org/browse/investigation-type/24/heritage-management

description: This study examines the creation of the installations and provides representative samples of UPH and ancillary structures constructed and/or modified during the Cold War Era.
Driven-dissipative time crystalline phases in a two-mode bosonic system with Kerr nonlinearity
Creators: name: Bakker, L. R.
name: Bahovadinov, M. S.
name: Kurlov, D. V.
name: Gritsev, V.
name: Fedorov, Aleksey K.
name: Krimer, D. O.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: For the driven-dissipative system of two coupled bosonic modes in a nonlinear cavity resonator, we demonstrate a sequence of phase transitions from a trivial steady state to two distinct dissipative time crystalline phases. These effects are already anticipated at the level of the semiclassical analysis of the Lindblad equation using the theory of bifurcations and are further supported by the full quantum (numerical) treatment. The system is predicted to exhibit different dynamical phases characterized by an oscillating non-equilibrium steady state with non-trivial periodicity, which is a hallmark of time crystals. We expect that these phases can be directly probed in various cavity QED experiments.
description: 6+6 pages, 3+2 figures
Symmetric formulation of neutrino oscillations in matter and its intrinsic connection to renormalization-group equations
Creators: name: Zhou, Shun
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: In this article, we point out that the effective Hamiltonian for neutrino oscillations in matter is invariant under the transformation of the mixing angle $θ^{}_{12} \to θ^{}_{12} - π/2$ and the exchange of first two neutrino masses $m^{}_1 \leftrightarrow m^{}_2$, if the standard parametrization of lepton flavor mixing matrix is adopted. To maintain this symmetry in perturbative calculations, we present a symmetric formulation of the effective Hamiltonian by introducing an $η$-gauge neutrino mass-squared difference $Δ^{}_* \equiv ηΔ^{}_{31} + (1-η)Δ^{}_{32}$ for $0 \leq η\leq 1$, where $Δ^{}_{ji} \equiv m^2_j - m^2_i$ for $ji = 21, 31, 32$, and show that only $η= 1/2$, $η= \cos^2θ^{}_{12}$ or $η= \sin^2 θ^{}_{12}$ is allowed. Furthermore, we prove that $η= \cos^2 θ^{}_{12}$ is the best choice to derive more accurate and compact neutrino oscillation probabilities, by implementing the approach of renromalization-group equations. The validity of this approach becomes transparent when an analogy is made between the parameter $η$ herein and the renormalization scale $μ$ in relativistic quantum field theories.
description: 12 pages, no figures, minor changes, to be published in the Special Issue "Emerging Leaders" in J. Phys. G
Thermal Control of the Magnon-Photon Coupling in a Notch Filter coupled to a Yttrium-Iron-Garnet/Platinum System
Creators: name: Castel, Vincent
name: Jeunehomme, Rodolphe
name: Youssef, Jamal Ben
name: Vukadinovic, Nicolas
name: Manchec, Alexandre
name: Dejene, Fasil Kidane
name: Bauer, Gerrit E. W.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report thermal control of mode hybridization between the ferromagnetic resonance (FMR) and a planar resonator (notch filter) working at 4.74 GHz. The chosen magnetic material is a ferrimagnetic insulator (Yttrium Iron Garnet: YIG) covered by 6 nm of platinum (Pt). A current induced heating method has been used in order to enhance the temperature of the YIG/Pt system. The device permits us to control the transmission spectra and the magnon-photon coupling strength at room temperature. These experimental findings reveal potentially applicable tunable microwave filtering function.
description: 5 pages, 4 figures
Finding a Landing Site on an Urban Area: A Multi-Resolution Probabilistic Approach
Creators: name: Pinkovich, Barak
name: Matalon, Boaz
name: Rivlin, Ehud
name: Rotstein, Hector
Publisher: name: arXiv
Year: 2022
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: This paper considers the problem of finding a landing spot for a drone in a dense urban environment. The conflicting requirement of fast exploration and high resolution is solved using a multi-resolution approach, by which visual information is collected by the drone at decreasing altitudes so that spatial resolution of the acquired images increases monotonically. A probability distribution is used to capture the uncertainty of the decision process for each terrain patch. The distributions are updated as information from different altitudes is collected. When the confidence level for one of the patches becomes larger than a pre-specified threshold, suitability for landing is declared. One of the main building blocks of the approach is a semantic segmentation algorithm that attaches probabilities to each pixel of a single view. The decision algorithm combines these probabilities with a priori data and previous measurements to obtain the best estimates. Feasibility is illustrated by presenting a number of examples generated by a realistic closed-loop simulator.
Navy Unaccompanied Personnel Housing During the Cold War (1946-1989), Site Report: Naval Training Center Great Lakes, Illinois
Creators: name: Crosby, Melissa
Publisher: name: R. Christopher Goodwin & Asscociates, Inc.
Year: 2008
Subjects: subject: Great Lakes, Illinois
valueUri: https://core.tdar.org/browse/geographic-keyword/85952/great-lakes-illinois
subject: Cold War Era
valueUri: https://core.tdar.org/browse/temporal-keyword/5551/cold-war-era
subject: Cold War
valueUri: https://core.tdar.org/browse/temporal-keyword/7288/cold-war
subject: Housing
valueUri: https://core.tdar.org/browse/other-keyword/31892/housing
subject: Naval Training Center
valueUri: https://core.tdar.org/browse/other-keyword/167958/naval-training-center
subject: Historic Background Research
valueUri: https://core.tdar.org/browse/investigation-type/18/historic-background-research
subject: Heritage Management
valueUri: https://core.tdar.org/browse/investigation-type/24/heritage-management

description: This study examines the creation of the installations and provides representative samples of UPH and ancillary structures constructed and/or modified during the Cold War Era.
Dilatonic dyon-like black hole solutions in the model with two Abelian gauge fields
Creators: name: Abishev, M. E.
name: Boshkayev, K. A.
name: Ivashchuk, V. D.
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Dilatonic black hole dyon-like solutions in the gravitational $4d$ model with a scalar field, two 2-forms, two dilatonic coupling constants $λ_i \neq 0$, $i =1,2$, obeying $λ_1 \neq - λ_2$ and the sign parameter $\varepsilon = \pm 1$ for scalar field kinetic term are considered. Here $\varepsilon = - 1$ corresponds to a ghost scalar field. These solutions are defined up to solutions of two master equations for two moduli functions, when $λ^2_i \neq 1/2$ for $\varepsilon = - 1$. Some physical parameters of the solutions are obtained: gravitational mass, scalar charge, Hawking temperature, black hole area entropy and parametrized post-Newtonian (PPN) parameters $β$ and $γ$. The PPN parameters do not depend on the couplings $λ_i$ and $\varepsilon$. A set of bounds on the gravitational mass and scalar charge are found by using a certain conjecture on the parameters of solutions, when $1 +2 λ_i^2 \varepsilon > 0$, $i =1,2$.
description: 23 pages, Latex, 2 figures, corrected revised version: several paragraphs, remarks, equations and 5 references are added, ref. [13] is replaced. To appear in EPJC. arXiv admin note: substantial text overlap with arXiv:1504.07657
Surface-link families with arbitrarily large triple point number
Creators: name: Cazet, Nicholas
Publisher: name: arXiv
Year: 2022
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics

description: Analogous to a classical knot diagram, a surface-link can be generically projected to 3-space and given crossing information to create a broken sheet diagram. The triple point number of a surface-link is the minimal number of triple points among all broken sheet diagrams that lift to that surface-link. This paper generalizes a family of Oshiro to show that there are non-split surface-links of arbitrarily many trivial components whose triple point number can be made arbitrarily large.
Growth of Pure and Intercalated ZrTe2, TiTe2 and HfTe2 Dichalcogenide Single Crystals by Isothermal Chemical Vapor Transport
Creators: name: Correa, Lucas E.
name: de Faria, Leandro R.
name: Cardoso, Rennan S.
name: Chaia, Nabil
name: da Luz, Mario S.
name: Torikachvili, Milton S.
name: Machado, Antonio J. S.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We report on a modified chemical vapor transport (CVT) methodology for the growth of pure and intercalated Zr, Ti, and Hf dichalcogenide single crystals, e.g. ZrTe2, Gd0.05ZrTe2, HfTe2, and Cu0.05TiTe2. While the most common method for CVT growth is carried out in quartz tubes subjected to a temperature gradient between the charge and the growth location, the growth using this isothermal-CVT (ICVT) method takes place isothermally in sealed quartz tubes placed horizontally in box furnaces, using iodine (I2) as the transport agent. The structure and composition of crystals were determined by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), and induced coupling plasma (ICP). The crystals grown with this method can be large, and show excellent crystallinity and homogeneity. Their morphology is plate-like, and the larger dimensions can be as long as 15 mm.
description: submitted to journal of crystal growth
Identification and Categorization of Cold War–Era Research, Development, Testing, and Evaluation Property Types
Creators: name: Thompson, Scott
name: Tagg, Martyn D.
Publisher: name: Statistical Research, Inc.
Year: 2007
Subjects: subject: Cold War Era
valueUri: https://core.tdar.org/browse/temporal-keyword/5551/cold-war-era
subject: Cold War
valueUri: https://core.tdar.org/browse/temporal-keyword/7288/cold-war
subject: Department of Defense Legacy Resource Management Program
valueUri: https://core.tdar.org/browse/other-keyword/167943/department-of-defense-legacy-resource-management-program
subject: Architectural Documentation
valueUri: https://core.tdar.org/browse/investigation-type/16/architectural-documentation
subject: Architectural Survey
valueUri: https://core.tdar.org/browse/investigation-type/2/architectural-survey

description: The current project, initiated by HQ AFMC (M. Tagg 2004) and funded through the Legacy Program (Legacy Project No. 04-211) as a continuation of the HQ AFMC historic context (Weitze 2003), seeks to identify and categorize RDT&E property types and subtypes and present them as an addition to the current Interim Guidance list. The end result will be a more complete Air Force Cold War property typology for the materiel development facility category that augments the current typology.
Persistent current oscillations in a double-ring quantum gas
Creators: name: Bland, T.
name: Yatsuta, I. V.
name: Edwards, M.
name: Nikolaieva, Y. O.
name: Oliinyk, A. O.
name: Yakimenko, A. I.
name: Proukakis, N. P.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Vorticity in closed quantum fluid circuits is known to arise in the form of persistent currents. In this work, we develop a method to engineer transport of the quantized vorticity between density-coupled ring-shaped atomic Bose-Einstein condensates in experimentally accessible regimes. Introducing a tunable weak link between the rings, we observe and characterize the controllable periodic transfer of the current and investigate the role of temperature on suppressing these oscillations via a range of complementary state-of-the-art numerical methods. Our setup paves the way for precision measurements of local acceleration and rotation.
description: 12 pages, 6 figures