cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
GNC Improvements between Vega and Vega-C
Creators: name:  ANGELO TOMASSINI
name:   IRENE CRUCIANI
name:   CHRISTIAN POMPONI
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: GNC
LAUNCHER
FLEXIBILITY
AVIO
SOFTWARE
TVC

description: The improvements introduced in Vega-C on GNC had the purpose of reduce the missionization costs and simultaneously increase the flexibility of the launcher to cope with always increasing complexity of multi-payload missions. The reduction of missionization costs has been obtained reducing the specific tuning activities for each mission and speeding up some tools to decrease the loop time. Some modifications have been introduced in TVC algorithms in order to limit as much as possible the recurring activities. On the other hand, the increase of flexibility has been obtained introducing a new architecture of the orbital phase, with the so called \"timeline flexibility\", that allows composing the mission with simple building blocks.
Antrag im Zuge des internen Calls zur Unterstützung von Projekten im Kontext des Leibniz-Forschungsverbunds Open Science
Creators: name: Förstner, Konrad U.
name: Scholl, Dominik
name: Ackermann, Marcel R.
name: Mietchen, Daniel
Publisher: name: Zenodo
Year: 2020
Subjects: wikidata

description: Antrag im Zuge des internen Calls zur Unterstützung von Projekten im Kontext des Leibniz-Forschungsverbunds Open Science.
Dynamic Binary Search Trees: Improved Lower Bounds for the Greedy-Future Algorithm
Creators: name: Sadeh, Yaniv
name: Kaplan, Haim
Publisher: name: arXiv
Year: 2023
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences

description: Binary search trees (BSTs) are one of the most basic and widely used data structures. The best static tree for serving a sequence of queries (searches) can be computed by dynamic programming. In contrast, when the BSTs are allowed to be dynamic (i.e. change by rotations between searches), we still do not know how to compute the optimal algorithm (OPT) for a given sequence. One of the candidate algorithms whose serving cost is suspected to be optimal up-to a (multiplicative) constant factor is known by the name Greedy Future (GF). In an equivalent geometric way of representing queries on BSTs, GF is in fact equivalent to another algorithm called Geometric Greedy (GG). Most of the results on GF are obtained using the geometric model and the study of GG. Despite this intensive recent fruitful research, the best lower bound we have on the competitive ratio of GF is $\frac{4}{3}$. Furthermore, it has been conjectured that the additive gap between the cost of GF and OPT is only linear in the number of queries. In this paper we prove a lower bound of $2$ on the competitive ratio of GF, and we prove that the additive gap between the cost of GF and OPT can be $Ω(m \cdot \log\log n)$ where $n$ is the number of items in the tree and $m$ is the number of queries.
description: Accepted to STACS 2023; Revised appendix A.1: simplified construction and analysis; Fixed an issue in Theorems 6-7
Gravitational Decoherence, Alternative Quantum Theories and Semiclassical Gravity
Creators: name: Hu, B. L.
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this report we discuss three aspects: 1) Semiclassical gravity theory (SCG): 4 levels of theories describing the interaction of quantum matter with classical gravity; 2) Alternative Quantum Theories: Discerning those which are derivable from general relativity (GR) plus quantum field theory (QFT) from those which are not; 3) Gravitational Decoherence: Derivation of a master equation and examination of the assumptions which led to the claims of observational possibilities. We list three sets of corresponding problems worthy of pursuit: a) Newton-Schrödinger Equations in relation to SCG; b) Master equation of gravity-induced effects serving as discriminator of 2); and c) Role of gravity in macroscopic quantum phenomena.
description: 18 pages. Invited talk at the Second International Conference on Emergent Quantum Mechanics, Vienna, October 3-6, 2013. Note: this arXiv version is more up to date than that which will appear in J. Phys. (Conf. Ser.)
Propagator and transfer matrices, Marchenko focusing functions and their mutual relations
Creators: name: Wapenaar, Kees
name: Dukalski, Marcin
name: Reinicke, Christian
name: Snieder, Roel
Publisher: name: arXiv
Year: 2023
Subjects: subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: Many seismic imaging methods use wave field extrapolation operators to redatum sources and receivers from the surface into the subsurface. We discuss wave field extrapolation operators that account for internal multiple reflections, in particular propagator matrices, transfer matrices and Marchenko focusing functions. A propagator matrix is a square matrix that `propagates' a wave-field vector from one depth level to another. It accounts for primaries and multiples and holds for propagating and evanescent waves. A Marchenko focusing function is a wave field that focuses at a designated point in space at zero time. Marchenko focusing functions are useful for retrieving the wave field inside a heterogeneous medium from the reflection response at its surface. By expressing these focusing functions in terms of the propagator matrix, the usual approximations (such as ignoring evanescent waves) are avoided. While a propagator matrix acts on the full wave-field vector, a transfer matrix (according to the definition employed in this paper)`transfers' a decomposed wave-field vector (containing downgoing and upgoing waves) from one depth level to another. It can be expressed in terms of decomposed Marchenko focusing functions. We present propagator matrices, transfer matrices and Marchenko focusing functions in a consistent way and discuss their mutual relations. In the main text we consider the acoustic situation and in the appendices we discuss other wave phenomena. Understanding these mutual connections may lead to new developments of Marchenko theory and its applications in wave field focusing, Green's function retrieval and imaging.
description: 43 pages, 4 figures
Interaction of One-Dimensional Quantum Droplets with Potential Wells and Barriers
Creators: name: Debnath, Argha
name: Khan, Ayan
name: Malomed, Boris
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We address static and dynamical properties of one-dimensional (1D) quantum droplets (QDs) under the action of local potentials in the form of narrow wells and barriers. The QDs are governed by the 1D Gross-Pitaevskii equation including the mean-field cubic repulsive term and the beyond-mean-field attractive quadratic one. In the case of the well represented by the delta-functional potential, three exact stable solutions are found for localized states pinned to the well. The Thomas-Fermi approximation for the well and the adiabatic approximation for the collision of the QD with the barrier are developed too. Collisions of incident QDs with the wells and barriers are analyzed in detail by means of systematic simulations. Outcomes, such as fission of the moving QD into transmitted, reflected, and trapped fragments, are identified in relevant parameter planes. In particular, a counter-intuitive effect of partial or full rebound of the incident QD from the potential well is studied in detail and qualitatively explained.
description: 13 pages, 32 figures; To be published in Communions in Nonlinear Science and Numerical Simulation
Ultrasensitive 3He magnetometer for measurements of high magnetic fields
Creators: name: Nikiel, A.
name: Blümler, P.
name: Heil, W.
name: Hehn, M.
name: Karpuk, S.
name: Maul, A.
name: Otten, E.
name: Schreiber, L. M.
name: Terekhov, M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We describe a 3He magnetometer capable to measure high magnetic fields (B > 0.1 Tesla) with a relative accuracy of better than 10^-12. Our approach is based on the measurement of the free induction decay of gaseous, nuclear spin polarized 3He following a resonant radio frequency pulse excitation. The measurement sensitivity can be attributed to the long coherent spin precession time T2* being of order minutes which is achieved for spherical sample cells in the regime of motional narrowing where the disturbing influence of field inhomogeneities is strongly suppressed. The 3He gas is spin polarized in-situ using a new, non-standard variant of the metastability exchange optical pumping. We show that miniaturization helps to increase T2* further and that the measurement sensitivity is not significantly affected by temporal field fluctuations of order 10^-4.
description: 27 pages, 7 figures
Sensitivity analysis of GNC strategies to propulsion system parameters for multi-orbits deliveries
Creators: name:  INIGO ALFORJA RUIZ
name:   ALBERTO SARRITZU
name:   LILY BLONDEL-CANEPARI
name:   ANGELO PASINI
name:   MICHELE LAVAGNA
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: ORBITAL TRANSFER
OPTIMIZED DELIVERY SEQUENCE
MISSION STRATEGY
PROPULSION SYSTEM PARAMETERS
SYSTEM-LEVEL CHOICES
ITERATION LOOP

description: This research investigates the delivery of 6U CubeSats to eight LEOs with akick stage system. The study aims to highlight the synergy between mission analysis and propulsion system design in achieving optimal delivery. The objective is to analyse the sensitivity of the optimal trajectory definition to various propulsion system parameters by comparing different propellant options, assessing the optimisation algorithm\'s response to anticipatedor unexpected engine failures, determining the minimum specific impulse required, and analysing the impact of varying propulsive system mass.These analyses ensure the robustness and reliability of the GNC tool, enhancing mission successand optimizing multi-orbit deliveries.
A gluing formula for the analytic torsion on hyperbolic manifolds with cusps
Creators: name: Pfaff, Jonathan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Spectral Theory (math.SP)
subject: Differential Geometry (math.DG)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: Primary: 58J52, Secondary: 53C35

description: For an odd-dimensional oriented hyperbolic manifold with cusps and strongly acyclic coefficient systems we define the Reidemeister torsion of the Borel-Serre compactification of the manifold using bases of cohomology classes defined via Eisenstein series by the method of Harder. In the main result of this paper we relate this combinatorial torsion to the regularized analytic torsion. Together with results on the asymptotic behaviour of the regularized analytic torsion, established previously, this should have applications to study the growth of torsion in the cohomology of arithmetic groups. Our main result is established via a gluing formula and here our approach is heavily inspired by a recent paper of Lesch.
Building a Fuel Moisture Model for the Coupled Fire-Atmosphere Model WRF-SFIRE from Data: From Kalman Filters to Recurrent Neural Networks
Creators: name: Mandel, J.
name: Hirschi, J.
name: Kochanski, A. K.
name: Farguell, A.
name: Haley, J.
name: Mallia, D. V.
name: Shaddy, B.
name: Oberai, A. A.
name: Hilburn, K. A.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences
subject: 68T07, 86-10

description: The current fuel moisture content (FMC) subsystems in WRF-SFIRE and its workflow system WRFx use a time-lag differential equation model with assimilation of data from FMC sensors on Remote Automated Weather Stations (RAWS) by the extended augmented Kalman filter. But the quality of the result is constrained by the limitations of the model and of the Kalman filter. We observe that the data flow in a system consisting of a model and the Kalman filter can be interpreted to be the same as the data flow in a recurrent neural network (RNN). Thus, instead of building more sophisticated models and data assimilation methods, we want to train a RNN to approximate the dynamics of the response of the FMC sensor to a time series of environmental data. Because standard AI approaches did not converge to reasonable solutions, we pre-train the RNN with special initial weights devised to turn it into a numerical solver of the differential equation. We then allow the AI training machinery to optimize the RNN weights to fit the data better. We illustrate the method on an example of a time series of 10h-FMC from RAWS and weather data from the Real-Time Mesoscale Analysis (RTMA).
description: 4 pages, 4 figures. Seminar on Numerical Analysis SNA'23, Ostrava, Czech Republic, January 23-27, 2023
Quantum Noise Correlation Experiments with Ultracold Atoms
Creators: name: Fölling, Simon
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Noise correlation analysis is a detection tool for spatial structures and spatial correlations in the in-trap density distribution of ultracold atoms. In this book chapter, we discuss the implementation, properties and limitations of the method applied to ensembles of ultracold atoms in optical lattices, and describe some instances where it has been applied.
description: 26 pages, 14 figures - To appear as Chapter 8 in "Quantum gas experiments - exploring many-body states," P. T\"orm\"a, K. Sengstock, eds. (Imperial College Press, to be published 2014)
PERSEUS and Minerva: Firing tests
Creators: name:  ARTHUR BERLET DECHAUFFOUR
name:   STEPHANIE DREYER
name:   MICHEL DUVERGEY
name:   SANDRA BOUJNAH
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: PERSEUS
MINERVA
FIRING TESTS

description: The PERSEUS (Projet Etudiant de Recherche Spatiale Europeen Universitaire et Scientifique) program launched, financed and managed by the Direction of Space Transportation of Centre National Eludes Spatial es (CNES) aims to make students discover the space field. Today, one of the stepping stone of the project is to launch the sounding rocket ASTREOS 1 by the end of May 2025. This bi-liquid rocket is equipped with the 5kN LOX/Ethanol MINERVA Engine. MINERVA engine, which has been designed some years ago by students in the frame of PERSEUS program, has been tested on the site of ArianeGroup SAS in Vernon in summer 2022, on the test facility P20. The objective was to assess the specimen regarding the necessary performances related to the launch of ASTREOS 1. Five firing tests were done in order to qualify the new test bench P20, to determine the performances of the engine and to choose between different configurations and materials for the thermal protection.
Exploiting Multiple Abstractions in Episodic RL via Reward Shaping
Creators: name: Cipollone, Roberto
name: De Giacomo, Giuseppe
name: Favorito, Marco
name: Iocchi, Luca
name: Patrizi, Fabio
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences
subject: I.2

description: One major limitation to the applicability of Reinforcement Learning (RL) to many practical domains is the large number of samples required to learn an optimal policy. To address this problem and improve learning efficiency, we consider a linear hierarchy of abstraction layers of the Markov Decision Process (MDP) underlying the target domain. Each layer is an MDP representing a coarser model of the one immediately below in the hierarchy. In this work, we propose a novel form of Reward Shaping where the solution obtained at the abstract level is used to offer rewards to the more concrete MDP, in such a way that the abstract solution guides the learning in the more complex domain. In contrast with other works in Hierarchical RL, our technique has few requirements in the design of the abstract models and it is also tolerant to modeling errors, thus making the proposed approach practical. We formally analyze the relationship between the abstract models and the exploration heuristic induced in the lower-level domain. Moreover, we prove that the method guarantees optimal convergence and we demonstrate its effectiveness experimentally.
description: This is an extended version of the paper presented at AAAI 2023, https://doi.org/10.1609/aaai.v37i6.25881
Light propagation in Kerr spacetime
Creators: name: Dahal, Pravin Kumar
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We explicitly solve the equations for the propagation of an electromagnetic wave up to the subleading order geometric optics expansion in the Kerr spacetime. This is done in two nontrivial steps. We first construct a set of parallel propagated null tetrad in Kerr spacetime. Two of the components of such tetrad give the propagation and polarization of an electromagnetic wave in geometric optics approximation. Then we use the parallel propagated tetrad to solve the modified trajectory equation in Kerr spacetime. We obtain the wavelength-dependent deviation of the trajectory of electromagnetic waves, which gives the mathematical description of the gravitational spin Hall effect in Kerr spacetime.
description: 8 pages, 2 figures, Matches published version; Comments Welcome
Underlying data and scripts for the publication "A census of RNA/protein complexes in a model Gram-positive bacterium reveals exonuclease-mediated sRNA activation in competence regulation" (Hör et al. 2020, EMBO Journal)
Creators: name: Hör, Jens
name: Di Giorgio, Silvia
name: Förstner, Konrad U.
name: Vogel, Jörg
Publisher: name: Zenodo
Year: 2020
Subjects: Grad-Seq
Streptococcus pneumoniae
RNA-Seq

description: Data and Scripts for the analysis performed for the article "A census of RNA/protein complexes in a model Gram-positive bacterium reveals exonuclease-mediated sRNA activation in competence regulation" (Hör et al. 2020, EMBO Journal). It represents the workflow of the analysis for Grad-Seq Data for Streptococcus pneumoniae TIGR4 and contains the input data as well as the results of the data processing.
Successive-Cancellation Flip Decoding of Polar Codes with a Simplified Restart Mechanism
Creators: name: Sagitov, Ilshat
name: Pillet, Charles
name: Balatsoukas-Stimming, Alexios
name: Giard, Pascal
Publisher: name: arXiv
Year: 2023
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Polar codes are a class of error-correcting codes that provably achieve the capacity of practical channels. The successive-cancellation flip (SCF) decoder is a low-complexity decoder that was proposed to improve the performance of the successive-cancellation (SC) decoder as an alternative to the high-complexity successive-cancellation list (SCL) decoder. The SCF decoder improves the error-correction performance of the SC decoder, but the variable execution time and the high worst-case execution time pose a challenge for the realization of receivers with fixed-time algorithms. The dynamic SCF (DSCF) variation of the SCF decoder further improves the error-correction performance but the challenge of decoding delay remains. In this work, we propose a simplified restart mechanism (SRM) that reduces the execution time of SCF and DSCF decoders through conditional restart of the additional trials from the second half of the codeword. We show that the proposed mechanism is able to improve the execution time characteristics of SCF and DSCF decoders while providing identical error-correction performance. For a DSCF decoder that can flip up to 3 simultaneous bits per decoding trial, the average execution time, the average additional execution time and the execution-time variance are reduced by approximately 31%, 37% and 57%, respectively. For this setup, the mechanism requires approximately 3.9% additional memory.
description: Accepted to 2023 IEEE Wireless Communications and Networking Conference (WCNC)
Test of QCD at large $Q^2$ with exclusive hadronic processes
Creators: name: Shen, Chengping
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: My report consists of two parts: (1). Using samples of 102 million $Υ(1S)$ and 158 million $Υ(2S)$ events at Belle, we study 17 exclusive hadronic decays of these two bottomonium resonances to some Vector-Pseudoscalar (VP), Vector-Tensor (VT) and Axial-vector-Pseudoscalar (AP) processes and their final states. Branching fractions are measured for all the processes. The ratios of the branching fractions of $Υ(2S)$ and $Υ(1S)$ decays into the same final state are used to test a perturbative QCD (pQCD) prediction for OZI-suppressed bottomonium decays. (2). Using data samples of 89 fb$^{-1}$, 703 fb$^{-1}$, and 121 fb$^{-1}$ collected at center-of-mass (CMS) energies 10.52, 10.58, and 10.876~GeV, respectively, we measure the cross sections of $e^+e^- \to ωπ^0$, $K^{\ast}(892)\bar{K}$, and $K_2^{\ast}(1430)\bar{K}$. The energy dependence of the cross sections is presented.
description: 4 pages, 2 figues. To appear in International Journal of Modern Physics: Conference Series for The XXXIII international symposium on Physics in Collision, Beijing, P. R. China from 03 - 07 September 2013
Outcome of Patients Treated with Oral Sofosbuvir and Ribavirin: One Year Follow up Experience
Creators: name: Khanzada, Ali
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 320209
subject: Gastroenterology and hepatology
classificationCode: 320211
subject: Infectious diseases
classificationCode: 310706
subject: Virology

description: Objective: The aim of this study was to evaluate the efficacy and safety of sofosbuvir plus ribavirin therapy and prevalence of hepatitis C relapses. Methodology: A descriptive case series study was planned and executed for the evaluation efficacy, safety and relapsers of among HCV patients treated with sofosbuvir plus ribavirin. One hundred patients were enrolled after careful monitoring of inclusion criteria. PCR, LFTs, CP, RFTs, Serum albumin and ultrasound performed in all patients and they were given 400mg of sofosbuvir and 1000mg of Ribavarin. There was no dropout of haemoglobin and ALT was normalized in both groups Results: 69% male and 31% females between January 2014 to March 2017. All patients were naive having genotype 3 and the average age in males being 33.3 years whilst in females being 51.61 years. At one-month post-treatment, 87.09% females and 78.265% males achieved RVR while ETR was 83.87% in females and 86.95% in males. Treatment-related adverse effects were myalgias, insomnia, and flu-like symptoms which need symptomatic treatment. After 3 months of follow up, SVR was observed to be 90.32% in females and 88.405% in males. However, subsequent follow up of 1 patients revealed a relapse rate of 12.9% in females and 8.69% in males after achieving SVR. Conclusion: The combination of sofosbuvir and ribavarin is safe and effective treatment for genotype 3 (GT3) non-cirrhotic patients.
Observational imprints of enhanced scalar power on small scales in ultra slow roll inflation and associated non-Gaussianities
Creators: name: Ragavendra, H. V.
name: Sriramkumar, L.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The discovery of gravitational waves from merging binary black holes has generated considerable interest in examining whether these black holes could have a primordial origin. If a significant number of black holes have to be produced in the early universe, the primordial scalar power spectrum should have an enhanced amplitude on small scales, when compared to the COBE normalized values on the larger scales that is strongly constrained by the anisotropies in the cosmic microwave background. In the inflationary scenario driven by a single, canonical scalar field, such power spectra can be achieved in models that permit a brief period of ultra slow roll inflation during which the first slow roll parameter decreases exponentially. In this review, we shall consider a handful of such inflationary models as well as a reconstructed scenario and examine the extent of formation of primordial black holes and the generation of secondary gravitational waves in these cases. We shall also discuss the strength and shape of the scalar bispectrum and the associated non-Gaussianity parameter that arise in such situations. We shall conclude with an outlook wherein we discuss the wider implications of the increased strengths of the non-Gaussianities on smaller scales.
description: v1: 35 pages, 14 figures, invited review, submitted to Galaxies; v2: 36 pages, 15 figures, minor revision, references and discussions added, version to appear in Galaxies
Aharonov-Bohm interference and phase-coherent surface-state transport in topological insulator rings
Creators: name: Behner, Gerrit
name: Jalil, Abdur Rehman
name: Heffels, Dennis
name: Kölzer, Jonas
name: Moors, Kristof
name: Mertens, Jonas
name: Zimmermann, Erik
name: Mussler, Gregor
name: Schüffelgen, Peter
name: Lüth, Hans
name: Grützmacher, Detlev
name: Schäpers, Thomas
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present low-temperature magnetotransport measurements on selectively-grown Sb$_2$Te$_3$-based topological insulator ring structures. These topological insulator ring geometries display clear Aharonov-Bohm oscillations in the conductance originating from phase-coherent transport around the ring. The temperature dependence of the oscillation amplitude indicates that the Aharonov-Bohm oscillations originate from ballistic transport along the ring arms. The oscillations can therefore be attributed to topological surface states, which can maintain a quasi-ballistic transport regime in the presence of disorder. Further insight on the phase coherence is gained by comparing with similar Aharonov-Bohm-type oscillations in topological insulator nanoribbons exposed to an axial magnetic field. Here, quasi-ballistic phase-coherent transport is confirmed for closed-loop topological surface states in transverse direction enclosing the cross-section of the nanoribbon. In contrast, the appearance of universal conductance fluctuations indicates phase-coherent transport in the diffuse regime, which is attributed to bulk carrier transport. Thus, it appears that even in the presence of diffusive $p$-type charge carriers in Aharonov-Bohm ring structures, phase-coherent quasi-ballistic transport of topologically protected surface states is maintained over long distances.
description: 11 pages (including Supplementary Material), 5 figures, 4 supplementary figures
Potential multi-component structure of the debris disk around HIP 17439 revealed by Herschel/DUNES
Creators: name: Ertel, S.
name: Marshall, J. P.
name: Augereau, J. -C.
name: Krivov, A. V.
name: Loehne, T.
name: Eiroa, C.
name: Mora, A.
name: del Burgo, C.
name: Montesinos, B.
name: Bryden, G.
name: Danchi, W.
name: Kirchschlager, F.
name: Liseau, R.
name: Maldonado, J.
name: Pilbratt, G. L.
name: Schueppler, Ch.
name: Thebault, Ph.
name: White, G. J.
name: Wolf, S.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: [abridged] Aims. Our Herschel Open Time Key Programme DUNES aims at detecting and characterizing debris disks around nearby, sun-like stars. In addition to the statistical analysis of the data, the detailed study of single objects through spatially resolving the disk and detailed modeling of the data is a main goal of the project. Methods. We obtained the first observations spatially resolving the debris disk around the sun-like star HIP 17439 (HD23484) using the instruments PACS and SPIRE on board the Herschel Space Observatory. Simultaneous multi-wavelength modeling of these data together with ancillary data from the literature is presented. Results. A standard single component disk model fails to reproduce the major axis radial profiles at 70 um, 100 um, and 160 um simultaneously. Moreover, the best-fit parameters derived from such a model suggest a very broad disk extending from few au up to few hundreds of au from the star with a nearly constant surface density which seems physically unlikely. However, the constraints from both the data and our limited theoretical investigation are not strong enough to completely rule out this model. An alternative, more plausible, and better fitting model of the system consists of two rings of dust at approx. 30 au and 90 au, respectively, while the constraints on the parameters of this model are weak due to its complexity and intrinsic degeneracies. Conclusions. The disk is probably composed of at least two components with different spatial locations (but not necessarily detached), while a single, broad disk is possible, but less likely. The two spatially well-separated rings of dust in our best-fit model suggest the presence of at least one high mass planet or several low-mass planets clearing the region between the two rings from planetesimals and dust.
description: 12 pages, 4 figures, accepted for publication in A&A
Dilepton production from hot and magnetized hadronic matter
Creators: name: Mondal, Rajkumar
name: Chaudhuri, Nilanjan
name: Ghosh, Snigdha
name: Sarkar, Sourav
name: Roy, Pradip
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The rate of dilepton emission from a magnetized hot hadronic medium is calculated in the framework of real time formalism of finite temperature field theory. We evaluate the one loop self-energy of neutral rho-meson containing thermo-magnetic propagators for the charged pions in the loop. The in-medium thermo-magnetic spectral function of rho obtained by solving the Dyson-Schwinger equation is shown to be proportional to the dilepton production rate. The study of the analytic structure of the neutral rho-meson spectral function in such a medium shows that in addition to the usual contribution coming from the Unitary cut beyond the two-pion threshold there is a non-trivial yield in the low invariant mass region originating due to the fact that the charged pions occupy different Landau levels before and after scattering with the neutral rho-meson and is purely a finite magnetic field effect.
description: Version published in Physical Review D
Subsystem symmetry, spin glass order, and criticality from random measurements in a two-dimensional Bacon-Shor circuit
Creators: name: Sharma, Vaibhav
name: Jian, Chao-Ming
name: Mueller, Erich J
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
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 study a 2D measurement-only random circuit motivated by the Bacon-Shor error correcting code. We find a rich phase diagram as one varies the relative probabilities of measuring nearest neighbor Pauli XX and ZZ check operators. In the Bacon-Shor code, these checks commute with a group of stabilizer and logical operators, which therefore represent conserved quantities. Described as a subsystem symmetry, these conservation laws lead to a continuous phase transition between an X-basis and Z-basis spin glass order. The two phases are separated by a critical point where the entanglement entropy between two halves of an L X L system scales as L ln L, a logarithmic violation of the area law. We generalize to a model where the check operators break the subsystem symmetries (and the Bacon-Shor code structure). In tension with established heuristics, we find that the phase transition is replaced by a smooth crossover, and the X- and Z-basis spin glass orders spatially coexist. Additionally, if we approach the line of subsystem symmetries away from the critical point in the phase diagram, some spin glass order parameters jump discontinuously
description: 11 pages, 7 figures ; Minor revisions in response to referee comments and corrected typos
Hybrid quantum thermal machines with dynamical couplings
Creators: name: Cavaliere, Fabio
name: Razzoli, Luca
name: Carrega, Matteo
name: Benenti, Giuliano
name: Sassetti, Maura
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Quantum thermal machines can perform useful tasks, such as delivering power, cooling, or heating. In this work, we consider hybrid thermal machines, that can execute more than one task simultaneously. We characterize and find optimal working conditions for a three-terminal quantum thermal machine, where the working medium is a quantum harmonic oscillator, coupled to three heat baths, with two of the couplings driven periodically in time. We show that it is possible to operate the thermal machine efficiently, in both pure and hybrid modes, and to switch between different operational modes simply by changing the driving frequency. Moreover, the proposed setup can also be used as a high-performance transistor, in terms of output--to--input signal and differential gain. Due to its versatility and tunability, our model may be of interest for engineering thermodynamic tasks and for thermal management in quantum technologies.
description: Original submitted version of the manuscript: 14 pages, 5(+1) color figures
Doctoral thesis recital (piano)
Creators: name: Hourez, Jeanne
Publisher: name: The University of Texas at Austin
Year: 2022
Subjects: Sonatas (Piano)
Piano music
Art music

description: Piano sonata in C minor, op. 21 / Chaminade -- Sonate pour piano, op. 6 / Sohy -- Piano sonata no. 2 / Levina
Modelling of MHD flow control for atmospheric re-entry
Creators: name:  BENJAMIN KHIAR
name:   FABIEN THOLIN
name:   FRANCOIS PECHEREAU
name:   DENIS PACKAN
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: MHD
RE-ENTRY
FLOW CONTROL
HYPERSONIC
MAGNETIC FIELD

description: We present recent developments in modelling magnetohydrodynamics (MHD) re-entry at ONERA. By applying a magnetic field on the re-entry ionized shocked flow, electrical currents and Lorentz forces can be generated around the vehicle. These effects can be harnessed to modify the aerodynamic forces as well as to reduce the intense heat fluxes that the vehicle experiences. We provide here an overview of the different numerical tools used for simulation of MHD phenomena occurring from high altitude to low altitude regimes. Continuum regime is in particular considered, with equilibrium or non-equilibrium effects allowed. Some applications are briefly described, from modelling laboratory MHD experiments in shock tubes to reproducing MHD-assisted re-entry in martian conditions.
Lee-Yang zeros and quantum Fisher information matrix in a nonlinear system
Creators: name: Tao, Hong
name: Su, Yuguo
name: Zhang, Xingyu
name: Liu, Jing
name: Wang, Xiaoguang
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The distribution of Lee-Yang zeros not only matters in thermodynamics and quantum mechanics, but also in mathematics. Hereby we propose a nonlinear quantum toy model and discuss the distribution of corresponding Lee-Yang zeros. Utilizing the coupling between a probe qubit and the nonlinear system, all Lee-Yang zeros can be detected in the dynamics of the probe qubit by tuning the coupling strength and linear coefficient of the nonlinear system. Moreover, the analytical expression of the quantum Fisher information matrix at the Lee-Yang zeros is provided, and an interesting phenomenon is discovered. Both the coupling strength and temperature can simultaneously attain their precision limits at the Lee-Yang zeros. However, the probe qubit cannot work as a thermometer at a Lee-Yang zero if it sits on the unit circle.
description: 9 pages, 4 figures, close to the published version
Performance Estimates of the Pseudo-Random Method for Radar Detection
Creators: name: Fish, Alexander
name: Gurevich, Shamgar
Publisher: name: arXiv
Year: 2014
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: A performance of the pseudo-random method for the radar detection is analyzed. The radar sends a pseudo-random sequence of length $N$, and receives echo from $r$ targets. We assume the natural assumptions of uniformity on the channel and of the square root cancellation on the noise. Then for $r \leq N^{1-δ}$, where $δ> 0$, the following holds: (i) the probability of detection goes to one, and (ii) the expected number of false targets goes to zero, as $N$ goes to infinity.
description: 5 pages, two figures, to appear in Proceedings of ISIT 2014 - IEEE International Symposium on Information Theory, Honolulu
Agrypnus darjeelingensis Chakraborty and Chakrabarti 2006
Creators: name: Kotru, Akash
name: Chandran, Nithya
name: Dubey, Anil Kumar
name: Prosvirov, Alexander S.
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Elateridae
Agrypnus
Agrypnus darjeelingensis

description: Agrypnus darjeelingensis Chakraborty and Chakrabarti, 2006
Agrypnus darjeelingensis Chakraborty and Chakrabarti, 2006: 39.
Type depository. Holotype (ZSI).
Type locality. West Bengal (Darjeeling).
Distribution. India: West Bengal.
Literature. Chakraborty and Chakrabarti (2006: 39): original description.
description: Published as part of Kotru, Akash, Chandran, Nithya, Dubey, Anil Kumar & Prosvirov, Alexander S., 2025, A catalogue of Indian Agrypninae Candèze, 1857 (Coleoptera: Elateridae), pp. 1-66 in Zootaxa 5614 (1) on page 16, DOI: 10.11646/zootaxa.5614.1.1, http://zenodo.org/record/15217075
Structure-based approach can identify driver nodes in ensembles of biologically-inspired Boolean networks
Creators: name: Newby, Eli
name: Zañudo, Jorge Gómez Tejeda
name: Albert, Réka
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantitative Methods (q-bio.QM)
subject: FOS: Biological sciences

description: Because the attractors of biological networks reflect stable behaviors (e.g., cell phenotypes), identifying control interventions that can drive a system towards its attractors (attractor control) is of particular relevance when controlling biological systems. Driving a network's feedback vertex set (FVS) by node-state override into a state consistent with a target attractor is proven to force every system trajectory to the target attractor, but in biological networks, the FVS is typically larger than can be realistically manipulated. External control of a subset of a biological network's FVS was proposed as a strategy to drive the network to its attractors utilizing fewer interventions; however, the effectiveness of this strategy was only demonstrated on a small set of Boolean models of biological networks. Here, we extend this analysis to ensembles of biologically-inspired Boolean networks. On these models, we use three structural metrics -- PRINCE propagation, modified PRINCE propagation, and CheiRank -- to rank FVS subsets by their predicted attractor control strength. We validate the accuracy of these rankings using three dynamical measures: To Control, Away Control, and logical domain of influence. We also calculate the propagation metrics on effective graphs, which incorporate each Boolean model's functional information into edge weights. While this additional information increases the predicting power of structural metrics, we find that the increase with respect to the unweighted network is limited. The propagation metrics in conjunction with the FVS can be used to identify realizable driver node sets by emulating the dynamics that are prevalent in biological networks. This approach only uses the network's structure, and the driver sets are shown to be robust to the specific dynamical model.
description: 17 pages, 9 figures
Semimetal-Monolayer Transition Metal Dichalcogenides Photodetectors for Wafer-Scale Ultraviolet Photonics
Creators: name: Sinn, Hon-Loen
name: Kumar, Aravindh
name: Pop, Eric
name: Newaz, Akm
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Atomically thin two-dimensional (2D) transition metal dichalcogenides (TMDs), such as MoS$_2$, are promising candidates for nanoscale photonics because of strong-light matter interactions. However, Fermi level pinning due to metal-induced gap (MIGS) states at the metals-monolayer MoS$_2$ interface limits the application of optoelectronic devices based on conventional metals because of the high contact resistance of the Schottky contacts. On the other hand, a semimetal-TMD-semimetal device can overcome this limitation, where the MIGS are sufficiently suppressed and can result in ohmic contacts. Here we demonstrate the optoelectronic performance of a bismuth-monolayer (1L) MoS$_2$-bismuth device with ohmic electrical contacts and extraordinary optoelectronic properties. To address the wafer-scale production, we grew full coverage 1L MoS$_2$ by using chemical vapor deposition method. We measured high photoresponsivity of 300 A/W in the UV regime at 77 K, which translates into an external quantum efficiency (EQE) ~ 1000 or $10^5$%. We found that the 90% rise time of our devices at 77 K is 0.1 ms, which suggests that the current devices can operate at the speed of ~ 10 kHz. The combination of large-array device fabrication, high sensitivity, and high-speed response offers great potential for applications in photonics that includes integrated optoelectronic circuits.
description: Accepted to Advanced Photonics Research
Approach to failure in porous granular materials under compression
Creators: name: Kun, F.
name: Varga, I.
name: Lennartz-Sassinek, S.
name: Main, I. G.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: We investigate the approach to catastrophic failure in a model porous granular material undergoing uniaxial compression. A discrete element computational model is used to simulate both the micro-structure of the material and the complex dynamics and feedbacks involved in local fracturing and the production of crackling noise. Under strain-controlled loading micro-cracks initially nucleate in an uncorrelated way all over the sample. As loading proceeds the damage localizes into a narrow damage band inclined at 30-45 degrees to the load direction. Inside the damage band the material is crushed into a poorly-sorted mixture of mainly fine powder hosting some larger fragments. The mass probability density distribution of particles in the damage zone is a power law of exponent 2.1, similar to a value of 1.87 inferred from observations of the length distribution of wear products (gouge) in natural and laboratory faults. Dynamic bursts of radiated energy, analogous to acoustic emissions observed in laboratory experiments on porous sedimentary rocks, are identified as correlated trails or cascades of local ruptures that emerge from the stress redistribution process. As the system approaches macroscopic failure consecutive bursts become progressively more correlated. Their size distribution is also a power law, with an equivalent Gutenberg-Richter b-value of 1.22 averaged over the whole test, ranging from 3 down to 0.5 at the time of failure, all similar to those observed in laboratory tests on granular sandstone samples. The formation of the damage band itself is marked by a decrease in the average distance between consecutive bursts and an emergent power law correlation integral of event locations with a correlation dimension of 2.55, also similar to those observed in the laboratory (between 2.75 and 2.25).
description: 13 pages, 11 figures
Effect of anisotropy in the $S=1$ underscreened Kondo lattice
Creators: name: Thomas, Christopher
name: Simões, Acirete S. da Rosa
name: Lacroix, Claudine
name: Iglesias, José Roberto
name: Coqblin, Bernard
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the effect of crystal field anisotropy in the underscreened $S=1$ Kondo lattice model. Starting from the two orbital Anderson lattice model and including a local anisotropy term, we show, through Schrieffer-Wolff transformation, that local anisotropy is equivalent to an anisotropic Kondo interaction ($J_{\parallel} \neq{J_{\perp}}$). The competition and coexistence between ferromagnetism and Kondo effect in this effective model is studied within a generalized mean-field approximation. Several regimes are obtained, depending on the parameters, exhibiting or not coexistence of magnetic order and Kondo effect. Particularly, we show that a re-entrant Kondo phase at low temperature can be obtained. We are also able to describe phases where the Kondo temperature is smaller than the Curie temperature ($T_K
description: 7 pages, 3 figures
Effect of transverse confinement on a quasi-one dimensional dipolar Bose gas
Creators: name: De Palo, Stefania
name: Orignac, Edmond
name: Citro, Roberta
name: Salasnich, Luca
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We study a gas of bosonic dipolar atoms in the presence of a transverse harmonic trapping potential by using an improved variational Bethe ansatz, which includes the transverse width of the atomic cloud as a variational parameter. Our calculations show that the system behavior evolves from quasi-one dimensional to a strictly one-dimensional one by changing the atom-atom interaction, or the axial density, or the frequency of the transverse confinement. Quite remarkably, in the droplet phase induced by the attractive dipolar interaction the system becomes sub-one dimensional when the transverse width is smaller than the characteristic length of the transverse harmonic confinement.
description: 6 pages, 4 figures (v1) 8 pages, 5 figures to be published in MDPI Condensed Matter Special Issue "Fluctuations and Highly Non-linear Phenomena in Superfluids and Superconductors VII", proceedings of Superfluctuations 2022, Padova
A Sub-Supersolution Approach for a Quasilinear Kirchhoff Equation
Creators: name: Alves, Claudianor O.
name: Corrêa, Francisco Julio S. A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: In this paper we establish an existence result for a quasilinear Kirchhoff equation via a sub and supersolution approach, by using the pseudomonotone operators theory.