cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Towards a RISC-V Open Platform for Next-generation Automotive ECUs
Creators: name: Cuomo, Luca
name: Scordino, Claudio
name: Ottaviano, Alessandro
name: Wistoff, Nils
name: Balas, Robert
name: Benini, Luca
name: Guidieri, Errico
name: Savino, Ida Maria
Publisher: name: arXiv
Year: 2023
Subjects: subject: Hardware Architecture (cs.AR)
subject: FOS: Computer and information sciences

description: The complexity of automotive systems is increasing quickly due to the integration of novel functionalities such as assisted or autonomous driving. However, increasing complexity poses considerable challenges to the automotive supply chain since the continuous addition of new hardware and network cabling is not considered tenable. The availability of modern heterogeneous multi-processor chips represents a unique opportunity to reduce vehicle costs by integrating multiple functionalities into fewer Electronic Control Units (ECUs). In addition, the recent improvements in open-hardware technology allow to further reduce costs by avoiding lock-in solutions. This paper presents a mixed-criticality multi-OS architecture for automotive ECUs based on open hardware and open-source technologies. Safety-critical functionalities are executed by an AUTOSAR OS running on a RISC-V processor, while the Linux OS executes more advanced functionalities on a multi-core ARM CPU. Besides presenting the implemented stack and the communication infrastructure, this paper provides a quantitative gap analysis between an HW/SW optimized version of the RISC-V processor and a COTS Arm Cortex-R in terms of real-time features, confirming that RISC-V is a valuable candidate for running AUTOSAR Classic stacks of next-generation automotive MCUs.
description: 8 pages, 2023 12th Mediterranean Conference on Embedded Computing (MECO)
Spin-wave dynamics in the KCeS2 delafossite: A theoretical description of powder inelastic neutron-scattering data
Creators: name: Avdoshenko, S. M.
name: Kulbakov, A. A.
name: Häußler, E.
name: Schlender, P.
name: Doert, Th.
name: Ollivier, J.
name: Inosov, D. S.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Layered rare-earth delafossites $ARX_2$ with $R$ = Yb(III) or Ce(III) have received a lot of interest as potential hosts for a quantum spin-liquid ground state. Some systems of this family that show no long-range order down to the lowest measured temperatures, such as NaYbO$_2$, NaYbS$_2$, and NaYbSe$_2$, are presumed to be in a quantum spin-liquid state. However, other isostructural compounds are known to order antiferromagnetically at subkelvin temperatures. Among them, KCeS$_2$ exhibits stripe-$yz$ magnetic order in the triangular-lattice planes that sets in below 400 mK. Here we investigate the spin-wave spectrum of this ordered phase with powder inelastic neutron scattering and describe it using a model Hamiltonian obtained from first-principles calculations based on the complete $|J,m_J\rangle$ multiplet description of the Ce sites with an anisotropic nearest-neighbor exchange interaction. Combing the current understanding of the exchange interaction in the systems with the effects of texturing in the powder, we have been able to model the inelastic neutron scattering spectrum with high fidelity.
description: 6 pages, 3 figures, accepted to Phys. Rev. B
Utilizing robust statistical methods for maximum likelihood estimation in clinical informatics for obstetrics research in the community hospital setting
Creators: name: Martingano, Daniel JS
Publisher: name: No Publisher Supplied
Year: 2022

description: BACKGROUND: Research in the field of obstetrics can be very challenging because the nature of studying treatments and interventions in pregnancy patients poses several ethical and practical limitations. Pregnancy research in the community hospital setting provides unique challenges but so too provides much needed answers to niche clinical problems, necessitating understanding, development, and implementation of statistical methods that are best suited to this scenario. OBJECTIVE:The objective of this dissertation is to provide a solution to these limitations by defining and implementing a statistical framework utilizing robust methods for conducting high-quality, practical research in the field of obstetrics and prove its effectiveness though original research with novel statistical methods.METHODS:Two prospective observational cohort studies were conducted: one evaluating antibiotic regimens in the management of preterm prelabor rupture of membranes and the other studying alternative antibiotic regimens for surgical prophylaxis for non-elective cesarean deliveries during the COVID-19 pandemic. The results of both studies were analyzed using robust statistical analysis to yield original results. RESULTS:The first study demonstrated a decreased risk was noted for the development of clinical chorioamnionitis (p=0.003), neonatal sepsis (p<0.001), and postpartum endometritis (p=0.010) when comparing azithromycin to erythromycin regimens. Pregnancy latency by regimen was not significantly different (p=0.90). The second study demonstrated that patients receiving clarithromycin had significantly lower rates and a decreased risk of postpartum endometritis as compared to those who did not receive adjunct prophylaxis (p=0.034). When evaluating robust statistical methods, the recommended statistical analysis framework for generalized linear regression and survival analysis under these unique circumstances includes Welch two-sample t-tests for continuous variables, G-Test and Fischer’s exact test for categorical variables, Quasi-likelihood Poisson regression with robust error variance, robust Cox proportional hazards model, Aalen-Johansen estimator with IJ variance for survival curve, and direct approach to adjusted survival curves. CONCLUSION:Utilizing this novel approach to statistical analysis as demonstrated by original research in this dissertation proposal for clinical research in high risk obstetrics in the community hospital setting may provide more accurate and appropriate results.
Dwarf nova-type cataclysmic variable stars are significant radio emitters
Creators: name: Coppejans, Deanne L.
name: Koerding, Elmar G.
name: Miller-Jones, James C. A.
name: Rupen, Michael P.
name: Sivakoff, Gregory R.
name: Knigge, Christian
name: Groot, Paul J.
name: Woudt, Patrick A.
name: Waagen, Elizabeth O.
name: Templeton, Matthew
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present 8--12\,GHz radio light curves of five dwarf nova (DN) type Cataclysmic Variable stars (CVs) in outburst (RX And, U Gem and Z Cam), or superoutburst (SU UMa and YZ Cnc), increasing the number of radio-detected DN by a factor of two. The observed radio emission was variable on time-scales of minutes to days, and we argue that it is likely to be synchrotron emission. This sample shows no correlation between the radio luminosity and optical luminosity, orbital period, CV class, or outburst type; however higher-cadence observations are necessary to test this, as the measured luminosity is dependent on the timing of the observations in these variable objects. The observations show that the previously detected radio emission from SS Cyg is not unique in type, luminosity (in the plateau phase of the outburst), or variability time-scales. Our results prove that DN, as a class, are radio emitters in outburst.
description: Accepted to MNRAS. 14 pages, 6 figures
ЭВОЛЮЦИЯ ПРОБИРОВАНИЯ ДРАГОЦЕННЫХ МЕТАЛЛОВ
Creators: name: КАМБАРОВА ОЙДИН СОБИРЖАНОВНА
Publisher: name: Наука, образование и культура
Year: 2020
Subjects: ЮВЕЛИРНОЕ ИСКУССТВО
КУЛЬТУРА
ОБРАБОТКИ МЕТАЛЛОВ
ИСКУССТВА
КЛЕЙМО
УКРАШЕНИЯ
ПРОБА
ПРОМЫШЛЕННОСТЬ

description: В данной работе проведён сравнительный анализ ювелирных изделий, говорится о мастерстве ремесленников, ювелирных изделиях в производстве и пробировании драгоценных металлов.
In vivo whole-cell recording from morphologically identified mouse superior colliculus neurons
Creators: name: Broersen, R.
name: Stuart, G. J.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Biological sciences

description: In vivo whole-cell recording when combined with morphological characterization after biocytin labeling is a powerful technique to study subthreshold synaptic processing in cell-type-identified neuronal populations. Here, we provide a step-by-step procedure for performing whole-cell recordings in the superior colliculus of urethane-anesthetized mice, a major visual processing region in the rodent brain. Two types of visual stimulation methods are described. While we focus on superior colliculus neurons, this protocol is applicable to other brain areas.
description: 29 pages including 4 figures
Feasibility into regional composting of green waste
Creators: name: Krstic, Mark.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
АКТУАЛЬНОСТЬ МАТЕРИАЛЬНОЙ ОТВЕТСТВЕННОСТИ ВОЕННОСЛУЖАЩЕГО ЗА УТРАТУ, ПОРЧУ, ХИЩЕНИЕ ЗАКРЕПЛЕННОГО ЗА НИМ ВООРУЖЕНИЯ
Creators: name: СМИРНОВ ВАЛЕРИЙ СТАЛИСЛАВОВИЧ
Publisher: name: Отечественная юриспруденция
Year: 2020
Subjects: ВОЕННОСЛУЖАЩИЙ
МАТЕРИАЛЬНАЯ ОТВЕТСТВЕННОСТЬ
ОРУЖИЕ
ПОРЧА
УТРАТА
ХИЩЕНИЕ
ВОЕННАЯ СЛУЖБА
ЗАКРЕПЛЕНИЕ ОРУЖИЯ
ПРИСЯГА

description: Данная статья посвящена существующей в настоящее время проблеме материальной ответственности военнослужащих за утрату, порчу, хищение закрепленного за ними оружия, которая не урегулирована положениями Федерального закона «О материальной ответственности военнослужащих». Рассматриваемая проблема достаточно актуальна, поскольку оружие является одним из неотъемлемых атрибутов военнослужащего, при этом современное оружие нередко имеет весьма высокую стоимость, и его утрата по любым причинам влечет за собой существенные материальные затраты для Вооруженных сил Российской Федерации .
An elliptic Garnier system
Creators: name: Ormerod, Christopher M.
name: Rains, Eric M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mathematical Physics (math-ph)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences
subject: 39A06, 14K25, 14H70

description: We present a linear system of difference equations whose entries are expressed in terms of theta functions. This linear system is singular at $4m+12$ points for $m \geq 1$, which appear in pairs due to a symmetry condition. We parameterize this linear system in terms a set of kernels at the singular points. We regard the system of discrete isomonodromic deformations as an elliptic analogue of the Garnier system. We identify the special case in which $m=1$ with the elliptic Painlevé equation, hence, this work provides an explicit form and Lax pair for the elliptic Painlevé equation.
description: 27 pages, 2 figures
Fully Dynamic Spanners with Worst-Case Update Time
Creators: name: Bodwin, Greg
name: Krinninger, Sebastian
Publisher: name: arXiv
Year: 2016
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences

description: An $α$-spanner of a graph $ G $ is a subgraph $ H $ such that $ H $ preserves all distances of $ G $ within a factor of $ α$. In this paper, we give fully dynamic algorithms for maintaining a spanner $ H $ of a graph $ G $ undergoing edge insertions and deletions with worst-case guarantees on the running time after each update. In particular, our algorithms maintain: (1) a $3$-spanner with $ \tilde O (n^{1+1/2}) $ edges with worst-case update time $ \tilde O (n^{3/4}) $, or (2) a $5$-spanner with $ \tilde O (n^{1+1/3}) $ edges with worst-case update time $ \tilde O (n^{5/9}) $. These size/stretch tradeoffs are best possible (up to logarithmic factors). They can be extended to the weighted setting at very minor cost. Our algorithms are randomized and correct with high probability against an oblivious adversary. We also further extend our techniques to construct a $5$-spanner with suboptimal size/stretch tradeoff, but improved worst-case update time. To the best of our knowledge, these are the first dynamic spanner algorithms with sublinear worst-case update time guarantees. Since it is known how to maintain a spanner using small amortized but large worst-case update time [Baswana et al. SODA'08], obtaining algorithms with strong worst-case bounds, as presented in this paper, seems to be the next natural step for this problem.
description: To be presented at the European Symposium on Algorithms (ESA) 2016
Shock excitation of H$_2$ in the James Webb Space Telescope era
Creators: name: Kristensen, L. E.
name: Godard, B.
name: Guillard, P.
name: Gusdorf, A.
name: Forets, G. Pineau des
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: (Abridged) H2 is the most abundant molecule in the Universe. Thanks to its widely spaced energy levels, it predominantly lights up in warm gas, T > 100 K, such as shocked regions, and it is one of the key targets of JWST observations. These include shocks from protostellar outflows, all the way up to starburst galaxies and AGN. Shock models are able to simulate H2 emission. We aim to explore H2 excitation using such models, and to test over which parameter space distinct signatures are produced in H2 emission. We present simulated H2 emission using the Paris-Durham shock code over an extensive grid of 14,000 plane-parallel stationary shock models, a large subset of which are exposed to an external UV radiation field. The grid samples 6 input parameters: preshock density, shock velocity, transverse magnetic field strength, UV radiation field strength, cosmic-ray-ionization rate, and PAH abundance. Physical quantities, such as temperature, density, and width, have been extracted along with H2 integrated line intensities. The strength of the transverse magnetic field, set by the scaling factor, b, plays a key role in the excitation of H2. At low values of b (<~ 0.3, J-type shocks), H2 excitation is dominated by vibrationally excited lines; at higher values (b >~ 1, C-type shocks), rotational lines dominate the spectrum for shocks with an external radiation field comparable to (or lower than) the solar neighborhood. Shocks with b >= 1 can be spatially resolved with JWST for nearby objects. When the input kinetic energy flux increases, the excitation and integrated intensity of H2 increases similarly. An external UV field mainly serves to increase the excitation, particularly for shocks where the input radiation energy is comparable to the input kinetic energy flux. These results provide an overview of the energetic reprocessing of input kinetic energy flux and the resulting H2 line emission.
description: Published in A&A
Variability study of the High Mass X-ray Binary IGR J18027--2016 with {\it Swift}--XRT
Creators: name: Aftab, Nafisa
name: Islam, Nazma
name: Paul, Biswajit
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report the results from pulsations and spectral analysis of a large number of observations of the HMXB pulsar IGR J18027--2016 with {\it Swift}--XRT, carried out at different orbital phases. In some orbital phases, as seen in different XRT observations, the X-ray intensity is found to vary by a large factor, of about $\sim$50. In all the observations with sufficient number of source X-ray photons, pulsations have been detected around the previously known pulse period of $\sim$140 sec, When detected, the pulse profiles do not show any significant variation over a flux difference of a factor of $\sim$3. The absorption column density is found to be large before and after the eclipse. We discuss various possible reasons for intensity and spectral variations in IGR J18027--2016, such as clumpy wind and hydrodynamic instabilities.
description: Accepted for publication in MNRAS, Comments are welcome
Logarithmic entanglement scaling in dissipative free-fermion systems
Creators: name: D'Abbruzzo, Antonio
name: Alba, Vincenzo
name: Rossini, Davide
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the quantum information spreading in one-dimensional free-fermion systems in the presence of localized thermal baths. We employ a nonlocal Lindblad master equation to describe the system-bath interaction, in the sense that the Lindblad operators are written in terms of the Bogoliubov operators of the closed system, and hence are nonlocal in space. The statistical ensemble describing the steady state is written in terms of a convex combination of the Fermi-Dirac distributions of the baths. Due to the singularity of the free-fermion dispersion, the steady-state mutual information exhibits singularities as a function of the system parameters. While the mutual information generically satisfies an area law, at the singular points it exhibits logarithmic scaling as a function of subsystem size. By employing the Fisher-Hartwig theorem, we derive the prefactor of the logarithmic scaling, which depends on the parameters of the baths and plays the role of an effective "central charge". This is upper bounded by the central charge governing ground-state entanglement scaling. We provide numerical checks of our results in the paradigmatic tight-binding chain and the Kitaev chain.
description: 17 pages, 11 figures. Added two figures. Close to published version
Precise dynamical masses of new directly imaged companions from combining relative astrometry, radial velocities, and Hipparcos-Gaia eDR3 accelerations
Creators: name: Rickman, E. L.
name: Matthews, E.
name: Ceva, W.
name: Ségransan, D.
name: Brandt, G. M.
name: Zhang, H.
name: Brandt, T. D.
name: Forveille, T.
name: Hagelberg, J.
name: Udry, S.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Aims. With an observing time span of more than 20 years, the CORALIE radial-velocity survey is able to detect long-term trends in data corresponding to companions with masses and separations accessible to direct imaging. Combining exoplanet detection techniques such as radial velocities from the CORALIE survey, astrometric accelerations from Hipparcos and Gaia eDR3, and relative astrometry from direct imaging, removes the degeneracy of unknown orbital parameters. This allows precise model-independent masses of detected companions to be derived, which provides a powerful tool to test models of stellar and substellar mass-luminosity relations. Methods. Long-term precise Doppler measurements with the CORALIE spectrograph reveal radial-velocity signatures of companions on long-period orbits. The long baseline of radial-velocity data allows the detectability of such companion candidates to be assessed with direct imaging. We combine long-period radial-velocity data with absolute astrometry from Hipparcos and Gaia eDR3 and relative astrometry derived from new direct imaging detections with VLT/SPHERE to fit orbital parameters and derive precise dynamical masses of these companions. Results. In this paper we report the discovery of new companions orbiting HD~142234, HD~143616, and HIP~22059, as well as the first direct detection of HD~92987~B, and update the dynamical masses of two previously directly imaged companions; HD~157338~B and HD~195010~B. The companions span a period range of 32 to 279 years and are all very low mass stellar companions, ranging from 218 to 487~$M_{\rm{Jup}}$. We compare the derived dynamical masses to mass-luminosity relations of very low mass stars (<0.5~$M_{\odot}$), and discuss the importance of using precursor radial-velocity and astrometric information to inform the future of high-contrast imaging of exoplanets and brown dwarfs
description: Accepted for publication in A&A, updated version including language edits
Time effects in the design of tilt-up walls
Creators: name: Bernard, George Gladstone.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Intrusion Resilience Systems for Modern Vehicles
Creators: name: Shoker, Ali
name: Rahli, Vincent
name: Decouchant, Jeremie
name: Esteves-Verissimo, Paulo
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cryptography and Security (cs.CR)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Networking and Internet Architecture (cs.NI)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Current vehicular Intrusion Detection and Prevention Systems either incur high false-positive rates or do not capture zero-day vulnerabilities, leading to safety-critical risks. In addition, prevention is limited to few primitive options like dropping network packets or extreme options, e.g., ECU Bus-off state. To fill this gap, we introduce the concept of vehicular Intrusion Resilience Systems (IRS) that ensures the resilience of critical applications despite assumed faults or zero-day attacks, as long as threat assumptions are met. IRS enables running a vehicular application in a replicated way, i.e., as a Replicated State Machine, over several ECUs, and then requiring the replicated processes to reach a form of Byzantine agreement before changing their local state. Our study rides the mutation of modern vehicular environments, which are closing the gap between simple and resource-constrained "real-time and embedded systems", and complex and powerful "information technology" ones. It shows that current vehicle (e.g., Zonal) architectures and networks are becoming plausible for such modular fault and intrusion tolerance solutions,deemed too heavy in the past. Our evaluation on a simulated Automotive Ethernet network running two state-of-the-art agreement protocols (Damysus and Hotstuff) shows that the achieved latency and throughout are feasible for many Automotive applications.
Detecting Subsystem Symmetry Protected Topological Order Through Strange Correlators
Creators: name: Zhou, Chengkang
name: Li, Meng-Yuan
name: Yan, Zheng
name: Ye, Peng
name: Meng, Zi Yang
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We employ strange correlators to detect 2D subsystem symmetry-protected topological (SSPT) phases which are nontrivial topological phases protected by subsystem symmetries. Specifically, we analytically construct efficient strange correlators in the 2D cluster model in the presence of a uniform magnetic field and then perform the projector Quantum Monte Carlo simulation within the quantum annealing scheme. We find that strange correlators show the long-range correlation in the SSPT phase, from which we define strange order parameters to characterize the topological phase transition between the SSPT phase at low fields and the trivial paramagnetic phase at high fields. Thus, the detection of the fully localized zero modes on the 1D physical boundary of SSPT phase has been transformed into the bulk correlation measurement about the local operators with the periodic boundary condition. We also find interesting spatial anisotropy of a strange correlator, which can be intrinsically traced back to the nature of spatial anisotropy of subsystem symmetries that protect SSPT order in the 2D cluster model. By simulating strange correlators, we, therefore, provide the first unbiased large-scale quantum Monte Carlo simulation on the easy and efficient detection in the SSPT phase and open the avenue of the investigation of the subtle yet fundamental nature of the novel interacting topological phases.
description: 16 pages, 14 figures
Mass Losing Asymptotic Giant Branch Stars and Supergiants
Creators: name: Whitelock, Patricia A.
name: Boyer, Martha
name: Höfner, Susanne
name: Wittkowski, Markus
name: Zijlstra, Albert A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: This paper presents a summary of four invited and twelve contributed presentations on asymptotic giant branch stars and red supergiants, given over the course of two afternoon splinter sessions at the 19th Cool Stars Workshop. It highlights both recent observations and recent theory, with some emphasis on high spatial resolution, over a wide range of wavelengths. Topics covered include 3D models, convection, binary interactions, mass loss, dust formation and magnetic fields.
description: To appear in the proceedings of the 19th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun; 19 pages and 20 figures
Quantum Monte Carlo study of three-dimensional Coulomb complexes: trions and biexcitons; hydrogen molecules and ions; helium hydride cations; and positronic and muonic complexes
Creators: name: Marsusi, F
name: Mostaani, E.
name: Drummond, N. D.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Three-dimensional (3D) excitonic complexes influence the optoelectronic properties of bulk semiconductors. More generally, correlated few-particle molecules and ions, held together by pairwise Coulomb potentials, play a fundamental role in a variety of fields in physics and chemistry. Based on statistically exact diffusion quantum Monte Carlo calculations, we have studied excitonic three- and four-body complexes (trions and biexcitons) in bulk 3D semiconductors as well as a range of small molecules and ions in which the nuclei are treated as quantum particles on an equal footing with the electrons. We present interpolation formulas that predict the binding energies of these complexes either in bulk semiconductors or in free space. By evaluating pair distribution functions within quantum Monte Carlo simulations, we examine the importance of harmonic and anharmonic vibrational effects in small molecules.
Synthesis of the Einstein-Podolsky-Rosen entanglement in a sequence of two single-mode squeezers
Creators: name: Fedorov, Ilya A.
name: Ulanov, Alexander E.
name: Kurochkin, Yury V.
name: Lvovsky, A. I.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Synthesis of the Einstein-Podolsky-Rosen entangled state --- the primary entangled resource in continuous-variable quantum-optical information processing --- is a technological challenge of great importance. Here we propose and implement a new scheme of generating this state. Two nonlinear optical crystals, positioned back-to-back in the waist of a pump beam, function as single-pass degenerate optical parametric amplifiers and produce single-mode squeezed vacuum states in orthogonal polarization modes, but in the same spatiotemporal mode. A subsequent pair of waveplates acts as a beam splitter, entangling the two polarization modes to generate the Einstein-Podolsky-Rosen state. This technique takes advantage of the strong nonlinearity associated with type-I phase-matching configuration while at the same time eliminating the need for actively stabilizing the optical phase between the two squeezers, which typically arises if these squeezers are spatially separated. We demonstrate our method in an experiment, preparing a 1.4 dB two-mode squeezed state and characterizing it via two-mode homodyne tomography.
description: 4 pages, 3 figures
Design of a calibration rig for the experimental study of heat transfer through refrigerator door gaskets
Creators: name: Hewa Koneputugodage, K.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Effects of leakage on the realization of a discrete time crystal in a chain of singlet-triplet qubits
Creators: name: Throckmorton, Robert E.
name: Sarma, S. Das
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We consider the effects of leakage on the ability to realize a discrete time crystal (DTC) in a semiconductor quantum dot linear array being operated as a chain of singlet-triplet (ST) qubits. This system realizes an Ising model with an effective applied magnetic field, plus additional terms that can cause leakage out of the computational subspace. We demonstrate that, in the absence of these leakage terms, this model theoretically realizes a DTC phase over a broad parameter regime for six and eight qubits, with a broader parameter range for the eight-qubit case. We then reintroduce the leakage terms and find that the DTC phase disappears entirely over the same parameter range if the system is only subject to a uniform magnetic field, which does not suppress leakage. However, we find that the DTC phase can be restored if the system is instead subject to a magnetic field that alternates from qubit to qubit, which suppresses leakage. We thus show that leakage is a serious problem for the realization of a DTC phase in a chain of ST qubits, but is by no means insurmountable. Our work suggests that experiments manifesting small-system stable DTC should be feasible with currently existing quantum dot spin qubits.
description: 17 pages, 20 figures. Two preprint references replaced with published versions. All instances of $\log$ replaced with $\log_{10}$ in both the text and figures. Now published in Phys. Rev. B; this is largely the published version
Formalized Class Group Computations and Integral Points on Mordell Elliptic Curves
Creators: name: Baanen, Anne
name: Best, Alex J.
name: Coppola, Nirvana
name: Dahmen, Sander R.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Logic in Computer Science (cs.LO)
subject: Number Theory (math.NT)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: F.4.1
subject: 68V20, 11D25, 11R11, 11R29

description: Diophantine equations are a popular and active area of research in number theory. In this paper we consider Mordell equations, which are of the form $y^2=x^3+d$, where $d$ is a (given) nonzero integer number and all solutions in integers $x$ and $y$ have to be determined. One non-elementary approach for this problem is the resolution via descent and class groups. Along these lines we formalized in Lean 3 the resolution of Mordell equations for several instances of $d<0$. In order to achieve this, we needed to formalize several other theories from number theory that are interesting on their own as well, such as ideal norms, quadratic fields and rings, and explicit computations of the class number. Moreover we introduced new computational tactics in order to carry out efficiently computations in quadratic rings and beyond.
description: 14 pages. Accepted for CPP '23. Source code available at https://github.com/lean-forward/class-group-and-mordell-equation
Total quantum coherence and its applications
Creators: name: Yu, Chang-shui
name: Yang, Yi-ren
name: Guo, Bao-qing
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum coherence is the most fundamental feature of quantum mechanics. The usual understanding of it depends on the choice of the basis, that is, the coherence of the same quantum state is different within different reference framework. To reveal all the potential coherence, we present the total quantum coherence measures in terms of two different methods. One is optimizing maximal basis-dependent coherence with all potential bases considered and the other is quantifying the distance between the state and the incoherent state set. Interestingly, the coherence measures based on relative entropy and $l_2$ norm have the same form in the two different methods. In particular, we show that the measures based on the non-contractive $l_2$ norm is also a good measure different from the basis-dependent coherence. In addition, we show that all the measures are analytically calculable and have all the good properties. The experimental schemes for the detection of these coherence measures are also proposed by multiple copies of quantum states instead of reconstructing the full density matrix. By studying one type of quantum probing schemes, we find that both the normalized trace in the scheme of deterministic quantum computation with one qubit (DQC1) and the overlap of two states in quantum overlap measurement schemes (QOM) can be well described by the change of total coherence of the probing qubit. Hence the nontrivial probing always leads to the change of the total coherence.
description: 12 pages, 1 figure. To appear in QIP
A Clockwork Theory
Creators: name: Giudice, Gian F.
name: McCullough, Matthew
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The clockwork is a mechanism for generating light particles with exponentially suppressed interactions in theories which contain no small parameters at the fundamental level. We develop a general description of the clockwork mechanism valid for scalars, fermions, gauge bosons, and gravitons. This mechanism can be implemented with a discrete set of new fields or, in its continuum version, through an extra spatial dimension. In both cases the clockwork emerges as a useful tool for model-building applications. Notably, the continuum clockwork offers a solution to the Higgs naturalness problem, which turns out to be the same as in linear dilaton duals of Little String Theory. We also elucidate the similarities and differences of the continuum clockwork with large extra dimensions and warped spaces. All clockwork models, in the discrete and continuum, exhibit novel phenomenology with a distinctive spectrum of closely spaced resonances.
description: Body of text 26 pages
Disparate exposure to fine particulate air pollution in formerly redlined cities : Chicago, Dallas, and Fort Worth
Creators: name: Kane, Clare Ennis MacLise
name: 0000-0001-7464-8510
Publisher: name: The University of Texas at Austin
Year: 2022
Subjects: Pollution
Environmental justice
Redlining: HOLC
Energy equity
PM₂.₅
Particulate matter
Housing
Racial disparities

description: Fine particulate matter (PM₂.₅) pollution is the largest environmental health risk in the United States and globally (GBD, 2019). The leading sources of PM₂.₅ pollution in the United States are fossil-fuel combustion sources like power generation and residential energy use. People of color are disproportionately exposed to PM₂.₅ pollution and have higher rates of asthma, which is known to be triggered by PM₂.₅ exposure. This thesis evaluates satellite PM₂.₅ pollution in three formerly Home Owner’s Loan Corporation (HOLC) “redlined” cities (Chicago, Dallas, and Fort Worth) to determine if historic housing policies that have perpetuated residential segregation contribute to current disparities in PM₂.₅ pollution exposure. Results suggest that residents currently living in historically low-grade HOLC neighborhoods in Chicago are exposed to significantly higher levels of PM₂.₅ pollution than high-grade HOLC neighborhoods. Although results for Dallas-Fort Worth are not statistically significant, a positive relationship between increase in HOLC grade and PM₂.₅ concentrations was found. Additionally, formerly low-grade HOLC neighborhoods had significantly higher asthma rates in 2017 than high-grade HOLC areas in all three cities. All three cities also have qualitative examples of citizens who are residing in formerly redlined neighborhoods, experiencing high concentrations of PM₂.₅ pollution from surrounding industry, and experiencing poor health outcomes. These findings further support efforts by communities of color to understand energy equity and advocate for environmental justice policies in their neighborhoods as well as the Environmental Protection Agency’s (EPA) goal to understand the air quality concerns in overburdened communities and the health impacts these have on residents
Young Stellar Populations in MYStIX Star Forming Regions: Candidate Protostars
Creators: name: Romine, Gregory
name: Feigelson, Eric D.
name: Getman, Konstantin V.
name: Kuhn, Michael A.
name: Povich, Matthew S.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The Massive Young Star Forming Complex in Infrared and X-ray (MYStIX) project provides a new census on stellar members of massive star forming regions within 4 kpc. Here the MYStIX Infrared Excess catalog (MIRES) and Chandra-based X-ray photometric catalogs are mined to obtain high-quality samples of Class I protostars using criteria designed to reduce extragalactic and Galactic field star contamination. A total of 1,109 MYStIX Candidate Protostars (MCPs) are found in 14 star forming regions. Most are selected from protoplanetary disk infrared excess emission, but 20% are found from their ultrahard X-ray spectra from heavily absorbed magnetospheric flare emission. Two-thirds of the MCP sample is newly reported here. The resulting samples are strongly spatially associated with molecular cores and filaments on Herschel far-infrared maps. This spatial agreement and other evidence indicate that the MCP sample has high reliability with relatively few 'false positives' from contaminating populations. But the limited sensitivity and sparse overlap among the infrared and X-ray subsamples indicate that the sample is very incomplete with many 'false negatives'. Maps, tables, and source descriptions are provided to guide further study of star formation in these regions. In particular, the nature of ultrahard X-ray protostellar candidates without known infrared counterparts needs to be eludicated.
description: 35 pages, 1 figure, 3 tables. Accepted for publication in the American Astronomical Society Journals. A full version with figure set and electronic tables is available (with other MYStIX papers) at http://www.astro.psu.edu/mystix
Perturbation of Compact Planetary Systems by Distant Giant Planets
Creators: name: Hansen, Bradley M. S.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We examine the effect of secular perturbations by giant planets on systems of multiple, lower mass planets orbiting Sun-like stars. We simulate the effects of forcing both eccentricity and inclination, separately and together. We compare our results to the statistics of the observed Kepler data and examine whether these results can be used to explain the observed excess of single transiting planets. We cannot explain the observed excess by pumping only inclination without driving most systems over the edge of dynamical instability. Thus, we expect the underlying planetary population for systems with a single transitting planet to contain an intrinsically low multiplicity population. We can explain the Kepler statistics and occurrence rates for R< 2 Rearth planets with a perturber population consistent with that inferred from radial velocity surveys, but require too many giant planets if we wish to explain all planets with R < 4 Rearth. These numbers can be brought into agreement if we posit the existence of an equivalent size population of planets below the RV detection limit (of characteristic mass 0.1 Mjupiter). This population would need to be dynamically hot to produce sufficiently strong perturbations and would leave the imprint of high obliquities amongst the surviving planets. Thus, an extensive sample of obliquities for low mass planets can help to indicate the presence of such a population. (...) Some of our simulations also produce planetary systems with planets that survive in the habitable zone but have no planets interior to them -- much as in the case of our Solar System. This suggests that such a configuration may not be altogether rare, but may occur around a few percent of FGK stars.
description: submitted, 33 pages, 25 figures
The Puzzling Detection of X-rays From Pluto by Chandra
Creators: name: Lisse, C. M.
name: McNutt,, R. L.
name: Wolk, S. J.
name: Bagenal, F.
name: Stern, S. A.
name: Gladstone, G. R.
name: Cravens, T. E.
name: Hill, M. E.
name: Kollmann, P.
name: Weaver, H. A.
name: Strobel, D. F.
name: Elliott, H. A.
name: McComas, D. J.
name: Binzel, R. P.
name: Snios, B. T.
name: Bhardwaj, A.
name: Chutjian, A.
name: Young, L. A.
name: Olkin, C. B.
name: Ennico, K. A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Using Chandra ACIS-S, we have obtained imaging Xray spectrophotometry of the Pluto system in support of the New Horizons flyby on 14 July 2015. 174 ksec of observations were obtained on 4 visits in Feb 2014 to Aug 2015. We measured a net signal of 6.8 counts and a noise level of 1.2 counts in a comoving 11 x 11 pixel box (100 x 100 R_Pluto) in the 0.31 to 0.60 keV passband for a detection at > 99.95 C.L. The Pluto photons do not match the background spectrum, are coincident with a 90% flux aperture comoving with Pluto, and are not sky source confused. The mean 0.31 to 0.60 keV Xray power from Pluto is 200 MW, in the midrange of Xray power levels seen for known solar system emission sources: auroral precipitation, solar Xray scattering, and charge exchange (CXE) between solar wind (SW) ions & atmospheric neutrals. We eliminate auroral effects as a source, as Pluto has no known magnetic field & the New Horizons Alice UV spectrometer detected no airglow from Pluto during the flyby. Nano-scale atmospheric haze particles could lead to enhanced resonant scattering of solar X-rays from Pluto, but the energy signature of the detected photons does not match the solar spectrum and estimates of Plutos scattered Xray emission are > 100 times below the 3.9e-5 cps found in our observations. CXE emission from SW carbon, nitrogen, and oxygen ions can produce the energy signature seen, and the 6e25 neutral gas escape rate from Pluto deduced from New Horizons data can support the 3.0e24 Xray photons/sec emission rate required by our observations. Using the SW proton density and speed measured by the Solar Wind Around Pluto (SWAP) instrument in the vicinity of Pluto at the time of the photon emissions, we find too few SW minor ions flowing into the 11 x 11 pixel box centered on Pluto than are needed to support the observed emission rate unless the SW is significantly focused and enhanced in this region.
description: 17 Pages, 3 Figures, 2 Tables Key words: Pluto, Chandra, Atmospheres, Coma, Solar Wind, Charge Exchange Spectroscopy, X-rays
A unified model of density limit in fusion plasmas
Creators: name: Zanca, P.
name: Sattin, F.
name: Escande, D. F.
name: Pucella, G.
name: Tudisco, O.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: A limit for the edge density, ruled by radiation losses from light impurities, is established by a minimal cylindrical magneto-thermal equilibrium model. For ohmic tokamak and reversed field pinch the limit scales linearly with the plasma current, as the empirical Greenwald limit. The auxiliary heating adds a further dependence, scaling with the 0.4 power, in agreement with L-mode tokamak experiments. For a purely externally heated configuration the limit takes on a Sudo-like form, depending mainly on the input power, and is compatible with recent Stellarator scalings.
Crystal Nucleation in Liquids: Open Questions and Future Challenges in Molecular Dynamics Simulations
Creators: name: Sosso, Gabriele C.
name: Chen, Ji
name: Cox, Stephen J.
name: Fitzner, Martin
name: Pedevilla, Philipp
name: Zen, Andrea
name: Michaelides, Angelos
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The nucleation of crystals in liquids is one of nature's most ubiquitous phenomena, playing an important role in areas such as climate change and the production of drugs. As the early stages of nucleation involve exceedingly small time and length scales, atomistic computer simulations can provide unique insight into the microscopic aspects of crystallization. In this review, we take stock of the numerous molecular dynamics simulations that in the last few decades have unraveled crucial aspects of crystal nucleation in liquids. We put into context the theoretical framework of classical nucleation theory and the state of the art computational methods, by reviewing simulations of e.g. ice nucleation or crystallization of molecules in solutions. We shall see that molecular dynamics simulations have provided key insight into diverse nucleation scenarios, ranging from colloidal particles to natural gas hydrates, and that in doing so the general applicability of classical nucleation theory has been repeatedly called into question. We have attempted to identify the most pressing open questions in the field. We believe that by improving (i.) existing interatomic potentials; and (ii.) currently available enhanced sampling methods, the community can move towards accurate investigations of realistic systems of practical interest, thus bringing simulations a step closer to experiments.
Supplementary document for Xenon-plasma focused ion beam processing of photonic microstructures with GaAs-based quantum dots - 6521579.pdf
Creators: name: Jaworski, Maciej
name: Chudzynska, Aleksandra
name: Mrowinski, Pawel
name: Prazmowska-Czajka, Joanna
name: Kijaszek, Wojciech
name: Große, Jan
name: Rodt, Sven
name: Reitzenstein, Stephan
name: Sek, Grzegorz
Publisher: name: Optica Publishing Group
Year: 2023
Subjects: Uncategorized

description: SEM images of micromesa structures realized fully by Xe-PFIB
Large Satellite Constellations and Their Potential Impact on VGOS Operations
Creators: name: Di Vruno, Federico
name: Tornatore, Vincenza
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Large LEO satellite constellations (or so-called Mega-constellations) will significantly change the view of the sky in some radio frequency bands. For VGOS telescopes it is important to understand the potential impact these constellations will have in their operations, what is the risk of its receivers going into non-linear behaviour and how much additional power would a telescope receive if observing in the same frequencies where satellites are transmitting. This work describes three of these new constellations (as they would look fully deployed) and summarizes the results of a particular study considering two VGOS telescopes (Onsala and Wettzell).
description: 10 pages, 9 figures