cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Investigation of the Pauli paramagnetic effect in systematically tuned NbN thin films
Creators: name: Wang, Xiaoni
name: Wang, Lijie
name: Liu, Yixin
name: Gao, Wanpeng
name: Wu, Yu
name: Xu, Zulei
name: Jin, Hua
name: Zhang, Lu
name: Peng, Wei
name: Wang, Zhen
name: Li, Wei
name: Mu, Gang
name: Lin, Zhirong
Publisher: name: arXiv
Year: 2022
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Superconductivity and the normal-state properties of NbN films can be tuned in a wide range, supplying a suitable platform to investigate the systematical evolution of the superconducting performances. Herein, we report the upper critical field of NbN films in both the vertical ($B\perp$ film) and parallel ($B\parallel$ film) orientations over a wide temperature range. Eight samples with the superconducting critical temperature $T_c$ ranging from 2.5 K to 9.8 K are studied. Meanwhile, the normal-state resistivity is tuned by more than six times by changing the conditions of the film growth. It is found that the magnitudes of the upper critical field in both field directions ($B_{c2}^{\perp}$ and $B_{c2}^{\parallel}$) exceed the paramagnetic limiting field $B_p$. The temperature dependent $B_{c2}^{\perp}$ can be described by the extended Werthamer--Helfand--Hohenberg (WHH) model considering the Pauli spin paramagnetism. Meanwhile, the $B_{c2}^{\parallel}$-$T$ data shows the feature of two-dimensional superconductivity in the temperature range near $T_c$. The evolution of the obtained Maki parameter with other parameters, such as the slope of the upper critical field near $T_c$ and the normal-state resistivity, are discussed to reveal the characteristics of the Pauli paramagnetic effect in this system.
description: 7 pages, 6 figures
Topological phase transition in the quench dynamics of a one-dimensional Fermi gas
Creators: name: Wang, Pei
name: Yi, Wei
name: Xianlong, Gao
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We study the quench dynamics of a one-dimensional ultracold Fermi gas in an optical lattice potential with synthetic spin-orbit coupling. At equilibrium, the ground state of the system can undergo a topological phase transition and become a topological superfluid with Majorana edge states. As the interaction is quenched near the topological phase boundary, we identify an interesting dynamical phase transition of the quenched state in the long-time limit, characterized by an abrupt change of the pairing gap at a critical quenched interaction strength. We further demonstrate the topological nature of this dynamical phase transition from edge-state analysis of the quenched states. Our findings provide interesting clues for the understanding of topological phase transitions in dynamical processes, and can be useful for the dynamical detection of Majorana edge states in corresponding systems.
description: 7 pages, 5 figures
Magnetic field-dependent electric charge transport in hadronic medium at finite temperature
Creators: name: Ghosh, Ritesh
name: Kurian, Manu
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Electric charge transport of hadronic matter at finite temperature and magnetic field is studied within the linear sigma model. Anisotropic transport coefficients associated with the charge transport are estimated both in the weak and strong regimes of the magnetic field using the transport theory approach. In a weakly magnetized medium, the magnetic field effects are incorporated through the Lorentz force term in the Boltzmann equation. Strong magnetic field puts further constraints on the motion of charged particles through Landau quantization. Magnetic field-dependent thermal relaxation time is obtained from interaction rates of hadrons with the S-matrix approach by considering the Landau level kinematics of the charged hadrons. Mean-field effects are embedded in the analysis through the temperature-dependent hadron masses. Further, the hadronic medium response to a time-varying external electric field is studied in weak and strong magnetic field regimes. It is seen that electromagnetic responses of the hadronic matter have a strong dependence on the mean-field effects, sigma mass, the strength of the external fields, and its evolution in the medium.
description: 22 pages, 7 figures
Simulating Spin-Orbit Coupling With Quasidegenerate N-Electron Valence Perturbation Theory
Creators: name: Majumder, Rajat
name: Sokolov, Alexander Yu.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present the first implementation of spin-orbit coupling effects in fully internally contracted second-order quasidegenerate N-electron valence perturbation theory (SO-QDNEVPT2). The SO-QDNEVPT2 approach enables the computations of ground- and excited-state energies and oscillator strengths combining the description of static electron correlation with an efficient treatment of dynamic correlation and spin-orbit coupling. In addition to SO-QDNEVPT2 with the full description of one- and two-body spin-orbit interactions at the level of two-component Breit-Pauli Hamiltonian, our implementation also features a simplified approach that takes advantage of spin-orbit mean-field approximation (SOMF-QDNEVPT2). The accuracy of these methods is tested for the group 14 and 16 hydrides, 3d and 4d transition metal ions, and two actinide dioxides (neptunyl and plutonyl dications). The zero-field splittings of group 14 and 16 molecules computed using SO-QDNEVPT2 and SOMF-QDNEVPT2 are in a good agreement with the available experimental data. For the 3d transition metal ions, the SO-QDNEVPT2 method is significantly more accurate than SOMF-QDNEVPT2, while no substantial difference in the performance of two methods is observed for the 4d ions. Finally, we demonstrate that for the actinide dioxides the results of SO-QDNEVPT2 and SOMF-QDNEVPT2 are in a good agreement with the data from previous theoretical studies of these systems. Overall, our results demonstrate that SO-QDNEVPT2 and SOMF-QDNEVPT2 are promising multireference methods for treating spin-orbit coupling with a relatively low computational cost.
Deep Learning-enabled Virtual Histological Staining of Biological Samples
Creators: name: Bai, Bijie
name: Yang, Xilin
name: Li, Yuzhu
name: Zhang, Yijie
name: Pillar, Nir
name: Ozcan, Aydogan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Medical Physics (physics.med-ph)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Histological staining is the gold standard for tissue examination in clinical pathology and life-science research, which visualizes the tissue and cellular structures using chromatic dyes or fluorescence labels to aid the microscopic assessment of tissue. However, the current histological staining workflow requires tedious sample preparation steps, specialized laboratory infrastructure, and trained histotechnologists, making it expensive, time-consuming, and not accessible in resource-limited settings. Deep learning techniques created new opportunities to revolutionize staining methods by digitally generating histological stains using trained neural networks, providing rapid, cost-effective, and accurate alternatives to standard chemical staining methods. These techniques, broadly referred to as virtual staining, were extensively explored by multiple research groups and demonstrated to be successful in generating various types of histological stains from label-free microscopic images of unstained samples; similar approaches were also used for transforming images of an already stained tissue sample into another type of stain, performing virtual stain-to-stain transformations. In this Review, we provide a comprehensive overview of the recent research advances in deep learning-enabled virtual histological staining techniques. The basic concepts and the typical workflow of virtual staining are introduced, followed by a discussion of representative works and their technical innovations. We also share our perspectives on the future of this emerging field, aiming to inspire readers from diverse scientific fields to further expand the scope of deep learning-enabled virtual histological staining techniques and their applications.
description: 35 Pages, 7 Figures, 2 Tables
Solvable random matrix ensemble with a logarithmic weakly confining potential
Creators: name: Buijsman, Wouter
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: This work identifies a solvable (in the sense that spectral correlation functions can be expressed in terms of orthogonal polynomials), rotationally invariant random matrix ensemble with a logarithmic weakly confining potential. The ensemble, which can be interpreted as a transformed Jacobi ensemble, is in the thermodynamic limit characterized by a Lorentzian eigenvalue density. It is shown that spectral correlation functions can be expressed in terms of the nonclassical Gegenbauer polynomials $C_n^{(-1/2)}(x)$ with $n \ge 2$, which have been proven to form a complete orthogonal set with respect to the proper weight function. A procedure to sample matrices from the ensemble is outlined and used to provide a numerical verification for some of the analytical results. This ensemble is pointed out to potentially have applications in quantum many-body physics.
description: 6 pages, 3 figures
The SNAD Viewer: Everything You Want to Know about Your Favorite ZTF Object
Creators: name: Malanchev, Konstantin
name: Kornilov, Matwey V.
name: Pruzhinskaya, Maria V.
name: Ishida, Emille E. O.
name: Aleo, Patrick D.
name: Korolev, Vladimir S.
name: Lavrukhina, Anastasia
name: Russeil, Etienne
name: Sreejith, Sreevarsha
name: Volnova, Alina A.
name: Voloshina, Anastasiya
name: Krone-Martins, Alberto
Publisher: name: arXiv
Year: 2022
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We describe the SNAD Viewer, a web portal for astronomers which presents a centralized view of individual objects from the Zwicky Transient Facility's (ZTF) data releases, including data gathered from multiple publicly available astronomical archives and data sources. Initially built to enable efficient expert feedback in the context of adaptive machine learning applications, it has evolved into a full-fledged community asset that centralizes public information and provides a multi-dimensional view of ZTF sources. For users, we provide detailed descriptions of the data sources and choices underlying the information displayed in the portal. For developers, we describe our architectural choices and their consequences such that our experience can help others engaged in similar endeavors or in adapting our publicly released code to their requirements. The infrastructure we describe here is scalable and flexible and can be personalized and used by other surveys and for other science goals. The Viewer has been instrumental in highlighting the crucial roles domain experts retain in the era of big data in astronomy. Given the arrival of the upcoming generation of large-scale surveys, we believe similar systems will be paramount in enabling an optimal exploitation of the scientific potential enclosed in current terabyte and future petabyte-scale data sets. The Viewer is publicly available online at https://ztf.snad.space
description: 21 pages, 9 figures. Published in PASP
On the exact region determined by Spearman's rho and Spearman's footrule
Creators: name: Bukovšek, Damjana Kokol
name: Stopar, Nik
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistics Theory (math.ST)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 62H20, 62H05, 60E05

description: We determine the lower bound for possible values of Spearman's rho of a bivariate copula given that the value of its Spearman's footrule is known and show that this bound is always attained. We also give an estimate for the exact upper bound and prove that the estimate is attained for some but not all values of Spearman's footrule. Nevertheless, we show that the estimate is quite tight.
description: 32 pages
221030 Chivers et al AJP-Renal data supplement.pdf
Creators: name: Chivers, Jacqueline
name: Whiles, Shannon
name: Miles, Conor
name: Biederman, Brianna
name: Ellison, Megan
name: Lovingood, Connor
name: Wright, Marie
name: Hoover, Donald
name: Raafey, Muhammad
name: Youngberg, George
name: Venkatachalam, Manjeri
name: Zheleznova, Nadezhda
name: Yang, Chun
name: Liu, Pengyuan
name: Kriegel, Alison
name: Cowley, Allen
name: Paul, O'Connor
name: Picken, Maria
name: Polichnowski, Aaron
Publisher: name: figshare
Year: 2022
Subjects: Animal physiology - systems
Systems physiology

description: Brown-Norway chromosome 1 mitigates the upregulation of pro-inflammatory pathways in mTAL cells and subsequent age-related CKD in Dahl SS/JrHsdMcwi Rats 
$\mathcal{PT}$-symmetry phase transition in a Bose-Hubbard model with localized gain and loss
Creators: name: Moca, Cătălin Paşcu
name: Sticlet, Doru
name: Dóra, Balázs
name: Zaránd, Gergely
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We study the dissipative dynamics of a one-dimensional bosonic system described in terms of the bipartite Bose-Hubbard model with alternating gain and loss. This model exhibits the $\mathcal{PT}$ symmetry under some specific conditions and features a $\mathcal{PT}$-symmetry phase transition. It is characterized by an order parameter corresponding to the population imbalance between even and odd sites, similar to the continuous phase transitions in the Hermitian realm. In the noninteracting limit, we solve the problem exactly and compute the parameter dependence of the order parameter. The interacting limit is addressed at the mean-field level, which allows us to construct the phase diagram for the model. We find that both the interaction and dissipation rates induce a $\mathcal{PT}$-symmetry breaking. On the other hand, periodic modulation of the dissipative coupling in time stabilizes the $\mathcal{PT}$-symmetric regime. Our findings are corroborated numerically on a tight-binding chain with gain and loss.
description: 8 pages, 7 figures
Ricevitore multifeed banda 33-50GHz: stima delle prestazioni stand alone e con il collegamento fibra ottica
Creators: name: ORFEI, ALESSANDRO
name: SCALAMBRA, ALESSANDRO
name: NESTI, Renzo
name: MARIOTTI, SERGIO
Publisher: name: IRA Bologna
Year: 2020

description: Nel presente rapporto vengono descritte le prestazioni simulate del ricevitore multifeed 19 beam operante nella banda 33-50 GHz (Q-band) da installare su SRT.
Vinorelbine as a radiosensitizer inPakistani patients with locally advancedunresectable head & neck cancer (HNC)in tertiary care hospital of Pakistan
Creators: name: Khanzada, Ali
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 321199
subject: Oncology and carcinogenesis not elsewhere classified
classificationCode: 321105
subject: Chemotherapy

description: Background: Head and neck cancer (HNC) is one of the most common cancers in Pakistan. Disease free survival in HNC remains poor due to inefficient loco-regional disease control. The aim of the present study was to assess the response rate and toxicity of concomitant vinorelbine and External radiation therapy (ERT) in advanced Head and Neck cancer in local Pakistani population. The study as per GCP guidelines was conducted at the oncology department of Nishat hospital Multan from the period from 2015 to 2017. Methodology: An observational, prospective study enrolled 50 patients with advanced head and neck cancer and prospectively analyzing the results. Primary tumor sites were tongue in 15 (30%) patients; lower lip in 6 (12%); buccal cavity in 5 (10%); cheek in 5 (10%); tonsil in 4 (8%); larynx in 6 (12%); hypopharynx in 5 (10%); and parotid in 4 (8%) patients. Initial clinical stage was: IV in 23 (46%) patients and III in 27 (54%) patients. VNB was given at dose of 10 mg i.v. infusion weekly with ERT (3D conformal radiation plan). Response rate was evaluated after at least 8 doses. Response evaluation criteria in Solid Tumors (RECIST) was used to assess complete and partial response (CR, PR); progressive and stable disease (PD, SD). Toxicity was assessed using common toxicity criteria version 3.0 (CTCV3.0). Results: 44 out of 50 patients were evaluable for response rate and toxicity. Immediate response was 90% CR. After 24 months of follow up CR, PR, SD, and PD were seen in 26 (59%), 6 (13%), 7 (15%) and 6 (13%) patients respectively. Grade III mucositis and dysphagia were observed in 19 (43%) and 8 (18%) patients respectively, grade III skin rash in 14 (30%) patients, grade-II peripheral neuropathy was seen in 3 (6%) patients. Conclusion: The study showed that vinorelbine as a radiosensitizer in advanced HNC is a feasible option with acceptable toxicities. A large study is required to define its definite role.
Robust Coding of Encrypted Images via Structural Matrix
Creators: name: Zhang, Yushu
name: Wong, Kwok-Wo
name: Zhang, Leo Yu
name: Xiao, Di
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: The robust coding of natural images and the effective compression of encrypted images have been studied individually in recent years. However, little work has been done in the robust coding of encrypted images. The existing results in these two individual research areas cannot be combined directly for the robust coding of encrypted images. This is because the robust coding of natural images relies on the elimination of spatial correlations using sparse transforms such as discrete wavelet transform (DWT), which is ineffective to encrypted images due to the weak correlation between encrypted pixels. Moreover, the compression of encrypted images always generates code streams with different significance. If one or more such streams are lost, the quality of the reconstructed images may drop substantially or decoding error may exist, which violates the goal of robust coding of encrypted images. In this work, we intend to design a robust coder, based on compressive sensing with structurally random matrix, for encrypted images over packet transmission networks. The proposed coder can be applied in the scenario that Alice needs a semi-trusted channel provider Charlie to encode and transmit the encrypted image to Bob. In particular, Alice first encrypts an image using globally random permutation and then sends the encrypted image to Charlie who samples the encrypted image using a structural matrix. Through an imperfect channel with packet loss, Bob receives the compressive measurements and reconstructs the original image by joint decryption and decoding. Experimental results show that the proposed coder can be considered as an efficient multiple description coder with a number of descriptions against packet loss.
description: 10 pages, 11 figures
A study on aerodynamics and mechanisms of elementary morphing models for flapping wing in bat forward flight
Creators: name: Zi-Wu, Guan
name: Yong-Liang, Yu
Publisher: name: arXiv
Year: 2014
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences
subject: 76B47, 76M23, 76Z10

description: The large active wing deformation is a significant way to generate high aerodynamic forces required in bat flapping flight. Besides the twisting, the elementary morphing models of a bat wing are proposed, such as wing-bending in the spanwise direction, wing-cambering in the chordwise direction, and wing area-changing. A plate of aspect ratio 3 is used to model a bat wing and a three dimensional unsteady panel method is applied to predict the aerodynamic forces. It is found that the cambering model has a great positive influence on the lift, followed by area-changing model and then the bending model. The further study indicates that the vortex control is a main mechanism to produce high aerodynamic forces, and the mechanisms for the aerodynamic force enhancement are the asymmetry of the cambered wing and the amplifier effects of wing area-changing and wing bending. The lift and thrust are mainly generated during the downstroke and almost negligible forces during the upstroke by the integrated morphing model-wing.
description: 10 pages, 10 figures
A scattering matrix formulation of the topological index of interacting fermions in one-dimensional superconductors
Creators: name: Meidan, Dganit
name: Romito, Alessandro
name: Brouwer, Piet W.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We construct a scattering matrix formulation for the topological classification of one-dimensional superconductors with effective time reversal symmetry in the presence of interactions. For a closed geometry, Fidkowski and Kitaev have shown that such systems have a $\mathbb{Z}_8$ topological classification. We show that in the weak coupling limit, these systems retain a unitary scattering matrix at zero temperature, with a topological index given by the trace of the Andreev reflection matrix, $\mbox{tr}\, r_{\rm he}$. With interactions, $\mbox{tr}\, r_{\rm he}$ generically takes on the finite set of values $0$, $\pm 1$, $\pm 2$, $\pm 3$, and $\pm 4$. We show that the two topologically equivalent phases with $\mbox{tr}\, r_{\rm he} = \pm 4$ support emergent many-body end states, which we identify to be a topologically protected Kondo-like resonance. The path in phase space that connects these equivalent phases crosses a non-fermi liquid fixed point where a multiple channel Kondo effect develops. Our results connect the topological index to transport properties, thereby highlighting the experimental signatures of interacting topological phases in one dimension.
description: 4 pages, 1 fig
Near-Term Quantum Computing Techniques: Variational Quantum Algorithms, Error Mitigation, Circuit Compilation, Benchmarking and Classical Simulation
Creators: name: Huang, He-Liang
name: Xu, Xiao-Yue
name: Guo, Chu
name: Tian, Guojing
name: Wei, Shi-Jie
name: Sun, Xiaoming
name: Bao, Wan-Su
name: Long, Gui-Lu
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Quantum computing is a game-changing technology for global academia, research centers and industries including computational science, mathematics, finance, pharmaceutical, materials science, chemistry and cryptography. Although it has seen a major boost in the last decade, we are still a long way from reaching the maturity of a full-fledged quantum computer. That said, we will be in the Noisy-Intermediate Scale Quantum (NISQ) era for a long time, working on dozens or even thousands of qubits quantum computing systems. An outstanding challenge, then, is to come up with an application that can reliably carry out a nontrivial task of interest on the near-term quantum devices with non-negligible quantum noise. To address this challenge, several near-term quantum computing techniques, including variational quantum algorithms, error mitigation, quantum circuit compilation and benchmarking protocols, have been proposed to characterize and mitigate errors, and to implement algorithms with a certain resistance to noise, so as to enhance the capabilities of near-term quantum devices and explore the boundaries of their ability to realize useful applications. Besides, the development of near-term quantum devices is inseparable from the efficient classical simulation, which plays a vital role in quantum algorithm design and verification, error-tolerant verification and other applications. This review will provide a thorough introduction of these near-term quantum computing techniques, report on their progress, and finally discuss the future prospect of these techniques, which we hope will motivate researchers to undertake additional studies in this field.
description: Please feel free to email He-Liang Huang with any comments, questions, suggestions or concerns
On the recovery of Local Group motion from galaxy redshift surveys
Creators: name: Nusser, Adi
name: Davis, Marc
name: Branchini, Enzo
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: There is a $\sim 150 km s^{-1}$ discrepancy between the measured motion of the Local Group of galaxies (LG) with respect to the CMB and the linear theory prediction based on the gravitational force field of the large scale structure in full-sky redshift surveys. We perform a variety of tests which show that the LG motion cannot be recovered to better than $150-200 km s^{-1}$ in amplitude and within a $\approx10^\circ$ in direction. The tests rely on catalogs of mock galaxies identified in the Millennium simulation using semi-analytic galaxy formation models. We compare these results to the $K_s=11.75$ Two-Mass Galaxy Redshift Survey, which provides the deepest, widest and most complete spatial distribution of galaxies available so far. In our analysis we use a new, concise relation for deriving the LG motion and bulk flow from the true distribution of galaxies in redshift space. Our results show that the main source of uncertainty is the small effective depth of surveys like the 2MRS that prevents a proper sampling of the large scale structure beyond $\sim100 h^{-1} Mpc$. Deeper redshift surveys are needed to reach the "convergence scale" of $\approx 250 h^{-1}Mpc $ in a $Λ$CDM universe. Deeper survey would also mitigate the impact of the "Kaiser rocket" which, in a survey like 2MRS, remains a significant source of uncertainty. Thanks to the quiet and moderate density environment of the LG, purely dynamical uncertainties of the linear predictions are subdominant at the level of $\sim 90 km s^{-1}$. Finally, we show that deviations from linear galaxy biasing and shot noise errors provide a minor contribution to the total error budget.
description: 14 pages, 7 figures
A Reinforcement Learning approach to UAV trajectory configuration
Creators: name:  RAZVAN-IONUT BALASA
name:   MARIAN-CIPRIAN BILU
name:   CATALIN IORDACHE
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: UAV
REINFORCEMENT LEARNING
PROXIMAL POLICY OPTIMIZATION
TRAJECTORY OPTIMIZATION

description: This paper presents a Reinforcement Leaming (RL) approach to Unmanned Aerial Vehicle (UA V) trajectory configuration, with a focus on the Proximal Policy Optimization (PPO). Our PPO agent has been trained in a simulation where the UAV dynamics and the surrounding environment have been modelled in order to imitate real-life conditions in both open-space and urban scenarios. The UA Vs have to pass through pre-established checkpoints and, depending on the performance of the PPO agent in accomplishing this task, the simulated environment responds to each action set with Gaussian rewards.
Horizon thermodynamics and cosmological equations: A holographic-like connection between thermostatistical quantities on a cosmological horizon and in the bulk
Creators: name: Komatsu, Nobuyoshi
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Horizon thermodynamics is expected to be related to the effective energy based on the energy density calculated from the Friedmann equation for a Friedmann--Robertson--Walker (FRW) universe. In the present study, the effective energy and thermostatistical quantities on a cosmological horizon are examined to clarify the holographic-like connection between them, with a focus on a de Sitter universe. To this end, the Helmholtz free energy on the horizon is derived from horizon thermodynamics. The free energy is found to be equivalent to the effective energy calculated from the Friedmann equation. This consistency is interpreted as a kind of holographic-like connection. To examine this connection, Padmanabhan's holographic equipartition law, which is related to the origin of spacetime dynamics, is applied to a de Sitter universe. It is found that the law should lead to a holographic-like connection. The holographic-like connection is considered to be a bridge between thermostatistical quantities on the horizon and in the bulk. For example, cosmological equations for a flat FRW universe can be derived from horizon thermodynamics by accepting the connection as a viable scenario. In addition, a thermal entropy equivalent to the Bekenstein--Hawking entropy is obtained from the Friedmann equation using the concept of a canonical ensemble in statistical physics. The present study provides new insight into the discussion of horizon thermodynamics and cosmological equations.
description: Final version accepted for publication in EPJC. Several paragraphs and references are added. [10 pages]
Effects of the matter Lagrangian degeneracy in $f(Q,T)$ gravity
Creators: name: Nájera, José Antonio
name: Alvarado, Carlos Aráoz
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: In this paper, we investigated the theoretical and cosmological effects of the matter Lagrangian degeneracy in an extension of the Symmetric Teleparallel Equivalent of General Relativity, denoted as $f (Q, T )$ gravity. This degeneracy comes from the fact that both $\mathcal{L}_m = p$ and $\mathcal{L}_m = -ρ$ can give rise to the stress-energy tensor of a perfect fluid. The $f(Q,T)$ equations depend on the form of the matter Lagrangian and hence they also have a degeneracy that has influence on the density evolution of dust matter and radiation, on the form of the generalized Friedmann equations and also shows changes in the cosmological parameters confidence regions when performing Monte Carlo Markov Chains analyses. Our results suggest that since changing the matter Lagrangian causes different theoretical and cosmological results, future studies in $f(Q,T)$ gravity should consider both forms of the matter Lagrangians to account for the different mathematical and observational results.
description: Accepted for publication in Physics of the Dark Universe
Modelling Heavy Neutral Leptons in Accelerator Beamlines
Creators: name: Plows, Komninos-John
name: Lu, Xianguo
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Heavy Neutral Leptons (HNLs) with masses $\mathcal{O}(0.1 - 1\,\,\text{GeV}/c^{2})$ are promising candidates for the simultaneous explanation of the smallness of the observed neutrino masses as well as the matter-antimatter asymmetry in the observable Universe. These particles can be produced in the decay of hadrons typically produced in a neutrino beamline used for oscillation experiments, and have sufficient lifetime to propagate to a near detector, where they decay to observable particles. For the approximation of a single new mass eigenstate mixing with the Standard Model via the lepton mixing matrix, a simulation framework based on the GENIE event generator has been developed. This module is designed to facilitate searches for HNL through a unified, minimal interface employing a detailed treatment of the kinematics and dynamics of massive unstable neutrinos, with a transparently organised suite of physics effects tracking the HNL from its production to its decay. These mechanisms are expounded on in the current work, underlining the rich landscape for novel, non-trivial physics that has already been identified in previous literature. This framework is an ongoing effort to provide a consistent and comprehensive description of heavy neutrinos from particle decays. We highlight use cases and future applications of interest to the accelerator neutrino community.
description: 25 pages, 19 figures. Accepted version by Physical Review D
Evaluation of hybrid electric powertrain topologies and their integration in future aircraft concepts for general aviation
Creators: name:  THORBEN HAMMER
name:   STEFANIE DE GRAAF
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: ELECTRIFIED PROPULSION
HYBRID-ELECTRIC
PROPULSION ARCHITECTURE
GENERAL AVIATION
FUTURE AVIATION

description: The presented paper introduces a methodology to evaluate novel powertrain topologies in early stages of the conceptual aircraft design. This methodology can be adapted to the requirements of an investigated aircraft concept. Specific criteria and weighting factors were derived from the requirements in preparation of the evaluation. The evaluation allows the identification of the most promising options for the powertrain topology. After the evaluation, a sensitivity study of the methodology was conducted, analysing the influence of the weighting factors on the final outcome. Furthermore, an integration concept of the selected powertrain topology for one aircraft concept is presented.
Physics Motivation for a Pilot Dark Matter Search at Jefferson Laboratory
Creators: name: Izaguirre, Eder
name: Krnjaic, Gordan
name: Schuster, Philip
name: Toro, Natalia
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: It has recently been demonstrated that a program of parasitic electron-beam fixed-target experiments would have powerful discovery potential for dark matter and other new weakly-coupled particles in the MeV-GeV mass range. The first stage of this program can be realized at Jefferson Laboratory using an existing plastic-scintillator detector downstream of the Hall D electron beam dump. This paper studies the physics potential of such an experiment and highlights its unique sensitivity to inelastic "exciting" dark matter and leptophilic dark matter scenarios. The first of these is kinematically inaccessible at traditional direct detection experiments and features potential "smoking gun" low-background signatures.
description: 11 pages, 7 figures
Fabrication of High-Aspect Ratio Nanogratings for Phase-based X-ray Imaging
Creators: name: Michalska, Martyna
name: Rossi, Alessandro
name: Kokot, Gasper
name: Macdonald, Callum M.
name: Cipiccia, Silvia
name: Munro, Peter R. T.
name: Olivo, Alessandro
name: Papakonstantinou, Ioannis
Publisher: name: arXiv
Year: 2022
Subjects: subject: Applied Physics (physics.app-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Medical Physics (physics.med-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Diffractive optical elements such as periodic gratings are fundamental devices in X-ray imaging - a technique that medical, material science and security scans rely upon. Fabrication of such structures with high aspect ratios at the nanoscale creates opportunities to further advance such applications, especially in terms of relaxing X-ray source coherence requirements. This is because typical grating-based X-ray phase imaging techniques (e.g., Talbot self-imaging) require a coherence length of at least one grating period and ideally longer. In this paper, the fabrication challenges in achieving high aspect-ratio nanogratings filled with gold are addressed by a combination of laser interference and nanoimprint lithography, physical vapor deposition, metal assisted chemical etching (MACE), and electroplating. This relatively simple and cost-efficient approach is unlocked by an innovative post-MACE drying step with hexamethyldisilazane, which effectively minimizes the stiction of the nanostructures. The theoretical limits of the approach are discussed and, experimentally, X-ray nanogratings with aspect ratios >40 demonstrated. Finally, their excellent diffractive abilities are shown when exposed to a hard (12.2 keV) monochromatic x-ray beam at a synchrotron facility, and thus potential applicability in phase-based X-ray imaging.
description: 27 pages, 5 figures in main text, plus supporting information
Aishī’s  ʿIshrat-nāma: a Dah-nāma with Unexpected Messengers
Creators: name: Beelaert, Anna Livia
Publisher: name: Fondazione Università Ca’ Foscari Venezia, Italia
Year: 2020

description:

In the first part of this article I presented an edition with a short introduction of ʿAishī Shīrāzī’s ʿIshrat-nāma, a poem belonging to the dah-nāma genre. In this second part I discuss the messengers who convey the messengers between the two lovers. At the request of his patron, ʿInāyat, an amir of the Aq-Quyūnlū Khalīl b. Uzun Ḥasan, instead of the usual messenger, the wind, ʿAishī chose for ten musical instruments. I argue that the choice of these instruments, and the way they are decribed, are not accidental but subtly convey the evolution of the protagonists’ feelings.

description: Annali di Ca’ Foscari. Serie orientale
Weyl semimetallic phase in an interacting lattice system
Creators: name: Mastropietro, Vieri
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mathematical Physics (math-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: By using Wilsonian Renormalization Group (RG) methods we rigorously establish the existence of a Weyl semimetallic phase in an interacting three dimensional fermionic lattice system, by showing that the zero temperature Schwinger functions are asymptotically close to the ones of massless Dirac fermions. This is done via an expansion which is convergent in a region of parameters, which includes the quantum critical point discriminating between the semimetallic and the insulating phase.
description: for a special issue of J. Stat. Phys. in memory of Kenneth G. Wilson
Classification of Flight Control Law Requirements in the Context of Model-Based Software Development and Verification
Creators: name:  ALEXANDER ARNOLD
name:   ROBERT LUCKNER
name:   GUIDO WEBER
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: FLIGHT CONTROL LAWS
CLASSIFICATION
VERIFICATION
MODEL-BASED

description: This paper describes a classification scheme for flight control law requirements to support the modelbased verification in an RICA DO-331 compliant software development process. The flight control law requirements are divided into requirement classes according to suitable verification methods. Individual classes are examined regarding possible automation for generating test cases. The characteristics of all requirement classes are described, and verification methods are demonstrated on examples from a representative industrial application. The results and the benefits of the method are discussed.
zfit - binned fits and histograms
Creators: name: Eschle, Jonas
Publisher: name: Zenodo
Year: 2022

description: zfit is a scalable, pythonic model fitting library that aims at implementing likelihood fits in HEP. So far, the main functionality was focused on unbinned fits. With zfit 0.10, the concept of binning is introduced and allows for binned datasets, PDFs and losses such as Chi2 or Binned likelihoods. All of these elements are interchangeable and convertable to unbinned counterparts and allow for an arbitrary mixture of both.
 In this talk, we will introduce the binned part of zfit and its integration into the existing Scikit-HEP ecosystem.
One-step achievement of robust multipartite Greenberger-Horne-Zeilinger state and controlled-phase gate via Rydberg interaction
Creators: name: Shao, Xiao-Qiang
name: Zheng, Tai-Yu
name: Oh, C. H.
name: Zhang, Shou
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a proposal for generation of a robust tripartite Greenberger-Horne-Zeilinger state among three-individual neutral Rydberg atoms. By modulating the relation between two-photon detuning and Rydberg interaction strength $U_{ij}(r)$, an effective Raman coupling is obtained between the hyperfine ground states $|F=2,M=2\rangle$ of three $^{87}$Rb atoms and the Rydberg states $|rrr\rangle$ via the third-order perturbation theory. This method is also capable of implementing a three-qubit controlled-phase gate with each qubit encoded into the hyperfine ground states $|F=1,M=1\rangle$ and $|F=2,M=2\rangle$. As an extension, we generalize our scheme to the case of multipartite GHZ state and quantum gate in virtue of high-order perturbation theory.
description: 6 pages, 5 figures
Coherent control of a high-orbital hole in a semiconductor quantum dot
Creators: name: Yan, Jun-Yong
name: Chen, Chen
name: Zhang, Xiao-Dong
name: Wang, Yu-Tong
name: Babin, Hans-Georg
name: Wieck, Andreas D.
name: Ludwig, Arne
name: Meng, Yun
name: Hu, Xiaolong
name: Duan, Huali
name: Chen, Wenchao
name: Fang, Wei
name: Cygorek, Moritz
name: Lin, Xing
name: Wang, Da-Wei
name: Jin, Chao-Yuan
name: Liu, Feng
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Coherently driven semiconductor quantum dots are one of the most promising platforms for non-classical light sources and quantum logic gates which form the foundation of photonic quantum technologies. However, to date, coherent manipulation of single charge carriers in quantum dots is limited mainly to their lowest orbital states. Ultrafast coherent control of high-orbital states is obstructed by the demand for tunable terahertz pulses. To break this constraint, we demonstrate an all-optical method to control high-orbital states of a hole via stimulated Auger process. The coherent nature of the Auger process is proved by Rabi oscillation and Ramsey interference. Harnessing this coherence further enables the investigation of single-hole relaxation mechanism. A hole relaxation time of 161 ps is observed and attributed to the phonon bottleneck effect. Our work opens new possibilities for understanding the fundamental properties of high-orbital states in quantum emitters and developing new types of orbital-based quantum photonic devices.
description: Manuscript with 14 pages and 6 figures plus supplementary Information comprising 15 pages and 14 figures. Nature Nanotechnology (24 July 2023)
A Measurement Framework for Directed Networks
Creators: name: Salehi, Mostafa
name: Rabiee, Hamid R.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Social and Information Networks (cs.SI)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Partially-observed network data collected by link-tracing based sampling methods is often being studied to obtain the characteristics of a large complex network. However, little attention has been paid to sampling from directed networks such as WWW and Peer-to-Peer networks. In this paper, we propose a novel two-step (sampling/estimation) framework to measure nodal characteristics which can be defined by an average target function in an arbitrary directed network. To this end, we propose a personalized PageRank-based algorithm to visit and sample nodes. This algorithm only uses already visited nodes as local information without any prior knowledge about the latent structure of the network. Moreover, we introduce a new estimator based on the approximate importance sampling to estimate average target functions. The proposed estimator utilizes calculated PageRank value of each sampled node as an approximation for the exact visiting probability. To the best of our knowledge, this is the first study on correcting the bias of a sampling method by re-weighting of measured values that considers the effect of approximation of visiting probabilities. Comprehensive theoretical and empirical analysis of the estimator demonstrate that it is asymptotically unbiased even in situations where stationary distribution of PageRank is poorly approximated.
description: 10 pages, 6 figures
Giorgio Damistra (1650-?), Theodoro Poulakis(1620-1692?) e il Barocco Levantino
Creators: name: Stoyanova, Magdelena
Publisher: name: Fondazione Università Ca’ Foscari Venezia, Italia
Year: 2020

description:

This paper reports the recent discovery of the autograph of Giorgio da Mistra, an apprentice of the famous Greek icon painter Theodoro Poulakis, on an icon of Saint Demetrius. In order to check its authenticity and give a plausible dating, the Author compares the biography, pictorial technique and aesthetic orientation of both post-Byzantine painters. She further introduces little-known notices about the Russian acquisitions during the 19th century on the Italian antiquarian market that could have intercepted other Da Mistra’s works and, in general, are of potential interest for the study of the post-Byzantine painting.

description: Annali di Ca’ Foscari. Serie orientale
From edge to bulk: Cavity induced displacement of topological non-local qubits
Creators: name: Méndez-Córdoba, F. P. M.
name: Rodríguez, F. J.
name: Tejedor, C.
name: Quiroga, L.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the ability of selective cavity coupling to a topological chain for tailoring the connectivity of Majorana fermions. We show how topological qubits (TQs), associated with non-local Majorana fermion pairing, can be moved from the edge to the bulk of a topological chain through selective access to light-matter interaction with specific physical sites. In particular, we present a comprehensive DMRG study of ground-state features in different chain-cavity coupling geometries and validate analytical insights in the strong coupling regime. This new kind of Majorana fermion correlation generation process comes with new cavity photon features. Moreover, by considering the time evolution after a sudden quench of the cavity-matter coupling strength, we show that the development of high non-trivial matter (Majorana) correlations leaves off measurable non-classical photon imprints in the cavity. New ways to dynamically generate TQ nonlocal correlations in topological chains of arbitrary length are thus provided, opening alternative routes to controllable long-range entanglement in hybrid photonic solid-state systems.
description: Main text: 12 pages, 9 figures