cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
SMA observations of young disks: separating envelope, disk, and stellar masses in class I YSOs
Creators: name: Lommen, Dave
name: Jorgensen, Jes
name: van Dishoeck, Ewine
name: Crapsi, Antonio
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: (abbreviated) We aim to determine the masses of the envelopes, disks, and central stars of young stellar objects (YSOs) in the Class I stage. We observed the embedded Class I objects IRS 63 and Elias 29 in the rho Ophiuchi star-forming region with the Submillimeter Array (SMA) at 1.1 mm. IRS 63 and Elias 29 are both clearly detected in the continuum, with peak fluxes of 459 resp. 47 mJy/beam. The continuum emission toward Elias 29 is clearly resolved, whereas IRS 63 is consistent with a point source down to a scale of 3 arcsec (400 AU). The SMA data are combined with single-dish data, and disk masses of 0.055 and >= 0.007 MSun and envelope masses of 0.058 and >= 0.058 MSun are empirically determined for IRS 63 and Elias 29, respectively. The disk+envelope systems are modelled with the axisymmetric radiative-transfer code RADMC, yielding disk and envelope masses that differ from the empirical results by factors of a few. HCO+ J = 3-2 is detected toward both sources, HCN J = 3-2 is not. The HCO+ position-velocity diagrams are indicative of Keplerian rotation. For a fiducial inclination of 30 degrees, we find stellar masses of 0.37 +/- 0.13 and 2.5 +/- 0.6 MSun for IRS 63 and Elias 29, respectively. We conclude that the sensitivity and spatial resolution of the SMA at 1.1 mm allow a good separation of the disks around Class I YSOs from their circumstellar envelopes and environments, and the spectral resolution makes it possible to resolve their dynamical structure and estimate the masses of the central stars. The ratios of the envelope and disk masses are found to be 0.2 and 6 for IRS 63 and Elias 29, respectively. This is lower than the values for Class 0 sources, which have Menv/Mdisk >= 10, suggesting that this ratio is a tracer of the evolutionary stage of a YSO.
description: 7 pages, 7 figures, accepted by A&A
Non-equilibrium theory for strongly coupled quantum dot with arbitrary on-site correlation strength
Creators: name: Fransson, J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: An analytical expression for the current through a single level quantum dot for arbitrary strength of the on-site electron-electron interaction is derived beyond standard mean-field theory. By describing the localised states in terms of many-body operators, the employed diagrammatic technique for strong coupling enables inclusion of electron correlation effects into the description of the local dynamics, which provides transport properties that are consistent with recent experimental data.
description: 14 pages, 4 figures
Ultrahigh-energy dipole and beyond
Creators: name: Lang, Rodrigo Guedes
name: Taylor, Andrew M.
name: de Souza, Vitor
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Recent data from the Pierre Auger Observatory has revealed the presence of a large-scale dipole in the arrival direction distribution of ultra-high energy cosmic rays (UHECR). In this work, we build up an understanding of the diffusive origin of such a dipolar behavior as well as its dependency on energy and astrophysical source assumptions such as extragalactic magnetic field strength and cosmic ray composition. We present a novel analytical approach for calculating the angular distribution of CR coming from a single source and discuss the regimes in which the steady-state dipole result is expected. We also present a semianalytical method for calculating the evolution with energy of the resultant dipole for an ensemble of sources. We show that a local source allows for a strong growth of the dipole with energy over a large energy range. The possibility of a transition from a dipolar to non-dipolar regime at the highest energies and its implications for the source density, magnetic field intensity, and cosmic ray composition are discussed.
Costs of Processing Genetically Modified Organisms: Analysis of the Rapeseed and Corn Industries
Creators: name: Gawron, Jana-Christina
name: Theuvsen, Ludwig
name: Gawron, Jana-Christina
name: Theuvsen, Ludwig
Publisher: name: Unknown
Year: 2007
Subjects: subject: GMO
subject: costs of processing
subject: rapeseed
subject: corn
subject: food industry
subject: GVO
subject: GVO-Vermeidungsstrategie
subject: Investitions- und Betriebskosten
subject: Parallelbetrieb

description: Die zunehmende Verbreitung gentechnisch veränderter Organismen (GVO) wirft die Frage nach möglichen wirtschaftlichen Konsequenzen auf. Die parallele Existenz von GVO- und GVO-freier Ware im Markt kann mit Kosten- und Nutzeneffekten verbunden sein und spielt somit aus betriebswirtschaftlicher Sicht eine wachsende Rolle für die Unternehmen der Ernährungswirtschaft. Vor diesem Hintergrund wurde im Herbst 2006 eine empirische Studie durchgeführt, um am Beispiel Raps und Mais die Strategien deutscher Lebensmittelverarbeiter im Umgang mit GVO sowie mögliche Zusatzkosten, die sich aus der zunehmenden Verbreitung von GVO ergeben können, zu ermitteln.
Connections Between Symmetries and Conservation Laws
Creators: name: Bluman, George
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mathematical Physics (math-ph)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: This paper presents recent work on connections between symmetries and conservation laws. After reviewing Noether's theorem and its limitations, we present the Direct Construction Method to show how to find directly the conservation laws for any given system of differential equations. This method yields the multipliers for conservation laws as well as an integral formula for corresponding conserved densities. The action of a symmetry (discrete or continuous) on a conservation law yields conservation laws. Conservation laws yield non-locally related systems that, in turn, can yield nonlocal symmetries and in addition be useful for the application of other mathematical methods. From its admitted symmetries or multipliers for conservation laws, one can determine whether or not a given system of differential equations can be linearized by an invertible transformation.
description: Published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
Note on entropy dynamics in the Brownian SYK model
Creators: name: Jian, Shao-Kai
name: Swingle, Brian
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
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 time evolution of Rényi entropy in a system of two coupled Brownian SYK clusters evolving from an initial product state. The Rényi entropy of one cluster grows linearly and then saturates to the coarse grained entropy. This Page curve is obtained by two different methods, a path integral saddle point analysis and an operator dynamics analysis. Using the Brownian character of the dynamics, we derive a master equation which controls the operator dynamics and gives the Page curve for purity. Insight into the physics of this complicated master equation is provided by a complementary path integral method: replica diagonal and non-diagonal saddles are responsible for the linear growth and saturation of Rényi entropy, respectively.
description: 33 pages
Opposites Attract - A Theorem About The Casimir Force
Creators: name: Kenneth, Oded
name: Klich, Israel
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We consider the Casimir interaction between (non-magnetic) dielectric bodies or conductors. Our main result is a proof that the Casimir force between two bodies related by reflection is always attractive, independent of the exact form of the bodies or dielectric properties. Apart from being a fundamental property of fields, the theorem and its corollaries also rule out a class of suggestions to obtain repulsive forces, such as the two hemisphere repulsion suggestion and its relatives.
description: Final version, published in Phys. Rev. Lett
KONKURRENZBEZIEHUNGEN ZWISCHEN DER BIOGASERZEUGUNG UND DER TIERISCHEN PRODUKTION (German)
Creators: name: Berenz, Stefan
name: Hoffmann, Helmut
name: Pahl, Hubert
name: Berenz, Stefan
name: Hoffmann, Helmut
name: Pahl, Hubert
Publisher: name: Unknown
Year: 2007
Subjects: subject: Faktorentlohnung
subject: Milch
subject: Fleisch
subject: Biogas

description: Die durchgeführten Kalkulationen zeigen, dass die Biogaserzeugung gegenüber den anderen Betriebszweigen einen hohen Gewinnbeitrag aufweist. Dies ist im Wesentlichen auf die 2004 angehobene Stromeinspeisevergütung zurückzuführen. Andererseits wird vor allem den Rinder haltenden Betrieben aufgrund der entkoppelten Direktzahlungen die Aufgabe der Tierhaltung und der Übergang zur Biogaserzeugung erleichtert. Allerdings ist die Biogaserzeugung durch einen relativ hohen Flächenanspruch bei gleichzeitig relativ geringem Arbeitzeitbedarf gekennzeichnet. Demzufolge wirken sich steigende Pachtpreise sehr ungünstig auf die Wettbewerbskraft der Biogaserzeugung aus. Andererseits kann der Übergang zur Biogaserzeugung zu einem verringerten Arbeitseinsatz in der Landwirtschaft und einem verstärkten Bedarf von außerlandwirtschaftlichen Beschäftigungsmöglichkeiten führen.
Mixing of heavy baryons in the bag model calculations
Creators: name: Bernotas, Andrius
name: Šimonis, Vytautas
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Spin-spin interaction causes the mixing between ground state wave functions of baryons containing three quarks of different flavors. We examine the effect of this mixing on the baryon masses in the framework of the modified bag model.
description: LaTeX, 11 pages, 5 tables
Modele struktury Metropolii GZM
Models of the structure of the GZM Metropolis
Creators: name: Aleksiuk, Szymon
name: Amistadi, Lamberto
name: Barczyk, Zuzanna
name: Berges, Leo
name: Biela, Kinga
name: Bradecki, Tomasz
name: Camiz, Alessandro
name: Chodzidło, Judyta
name: Cichoń, Dorota
name: Czech, Sandra
name: Gyurkovich, Mateusz
name: Janosz, Agata
name: Jodłowska, Hanna
name: Jodziewicz, Radosław
name: Kafka, Krzysztof
name: Kassowski, Szymon
name: Kotarska, Katarzyna
name: Krupa, Jakub
name: Ludwig, Jakub
name: Łukasik, Jakub
name: Magiera, Aleksandra
name: Majsak, Magdalena
name: Maśka, Tomasz
name: Mazur, Anna
name: Miszczak, Paulina
name: Moksik, Patrycja
name: Mól, Błażej
name: Mynarska, Magdalena
name: Petrova, Yoanna
name: Skoczylas, Mateusz
name: Stalica, Adam
name: Strzemińska, Ewelina
name: Szczygłowski, Rafał
name: Szlauer, Wiktoria
name: Wasik, Małgorzata
name: Wąsińska, Karolina
name: Zembaty, Oliwia
Publisher: name: Wydawnictwo Politechniki Śląskiej
Year: 2023
Subjects: struktura metropolii
obrazy generowane przez sztuczną inteligencję
projektowanie urbanistyczne
metropolie
planowanie przestrzenne
PBL (Project-Based Learning)
wizualizacja danych przestrzennych
rzeczywistość rozszerzona w nauczaniu
urbanistyka
struktura miasta
GIS (Geographical Information System)
Metropolia GZM
modele 3D
modele struktury miasta
rzeczywistość rozszerzona w edukacji
analiza urbanistyczna
Górnośląsko-Zagłębiowska Metropolia (GZM)

description: Publikacja zwarta pt. „Modele struktury Metropolii GZM” została wykonana w ramach zajęć projektowych z przedmiotu projektowanie urbanistyczne – struktura miasta, realizowanych na Wydziale Architektury Politechniki Śląskiej. Celem opracowania jest przedstawienie, analiza i synteza danych o GZM. Aby umożliwić porównanie zależności pomiędzy różnymi elementami wchodzącymi w skład metropolii, wykorzystano model komórkowy siatki kilometrowej oraz granice dzielnic każdej z gmin metropolii. Daje to syntetyczny obraz metropolii złożonej z kilkudziesięciu dzielnic. Przyjęta metoda badawcza ułatwia porównanie ich właściwości dzięki wizualizacji modeli 3D oraz ich prezentacji w postaci modeli w rzeczywistości rozszerzonej. Złożoność metropolii składającej się z 41 gmin jest faktem utrudniającym przetwarzanie danych i syntezę wiedzy na jej temat. Wobec tych uwarunkowań opracowanie zostało zrealizowane w formule PBL (Project Based Learning) w 32-osobowej grupie badawczej z wykorzystaniem oprogramowania GIS, modeli 3D, modeli w rzeczywistości rozszerzonej, a także sztucznej inteligencji. Efektem pracy jest zestawienie modeli i analiz struktury metropolii GZM.
Transcription of the narration of Reel #2 (collection LA 256)
Creators: name: Parker, Verdena
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2020
Subjects: subject: hup

description: Audio file VP-200317-06: transcription of VP-180317-06 (narration of Reel #2 from the LA 256 collection at SCOIL, one of six reels of 8mm film created by Verdena in the 1960s, featuring scenes of everyday life around Hoopa Valley as well as Brush Dances). From 3:07 to 5:36. Due to re-numbering, Reel #2 has been assigned the CLA item number LA 256.041.
Hartmann, Karl: Atlas-Tafel-Werk zu Bibel und Kirchengeschichte
Creators: name: Fink, Barbara E.
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 33 Nr. 4 (1984): Ökumenische Rundschau, Band 33, Heft 4
Rough-conduit flows and the existence of fully developed turbulence
Creators: name: Gioia, G.
name: Chakraborty, Pinaki
name: Bombardelli, Fabián A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: It is widely believed that at high Reynolds number (Re) all turbulent flows approach a state of "fully developed turbulence" defined by a unique, Re-independent statistics of the velocity fluctuations. Yet direct measurements of the velocity fluctuations have failed to yield clear-cut empirical evidence of the existence of fully developed turbulence. Here we relate the friction coefficient ($f$) of rough-conduit flows to the statistics of the velocity fluctuations. In light of experimental measurements of $f$, our results yield unequivocal evidence of the existence of fully developed turbulence.
description: 5 pages, 2 figures
Linear Polarization of the 21 cm Line from the Epoch of Reionization
Creators: name: Li, Bohua
name: Tan, Jianrong
name: Mao, Yi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The 21 cm linear polarization due to Thomson scattering off free electrons can probe the distribution of neutral hydrogen in the intergalactic medium during the epoch of reionization, complementary to the 21 cm temperature fluctuations. Previous study (Babich & Loeb 2005) estimated the strength of polarization with a toy model and claimed that it can be detected with 1-month observation of the Square Kilometre Array (SKA). Here we revisit this investigation with account of nonlinear terms due to inhomogeneous reionization, using seminumerical reionization simulations to provide the realistic estimation of the 21 cm TE and EE angular power spectra ($C^{\rm TE}_\ell$ and $C^{\rm EE}_\ell$). We find that (1) both power spectra are enhanced on sub-bubble scales but suppressed on super-bubble scales, compared with previous results; (2) $C^{\rm TE}_\ell$ displays a zero-crossing at $\ell<100$, and its angular scale is sensitive to the scale-dependence of H I bias on large scales; (3) the ratios of the power spectrum to its maximum value during reionization at a given $\ell$, i.e. $C^{\rm TE}_\ell / C^{\rm TE}_{\ell,{\rm max}} $ and $C^{\rm EE}_{\ell}/C^{\rm EE}_{\ell,{\rm max}}$, show robust correlations with the global ionized fraction. However, measurement of this signal will be very challenging not only because the overall strength is weaker than the sensitivity of SKA, but also because of the polarized foregrounds from diffuse synchrotron emission, and Faraday rotation which modifies the observed polarization. Nevertheless, the 21 cm linear polarization signal may still likely be detectable through other approaches, e.g. its cross-correlation with other probes.
description: 21 pages, 11 figures, Published in ApJ
Lowest Landau Level vortex structure of a Bose-Einstein condensate rotating in a harmonic plus quartic trap
Creators: name: Blanc, X.
name: Rougerie, N.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We investigate the vortex patterns appearing in a two-dimensional annular Bose-Einstein condensate rotating in a quadratic plus quartic confining potential. We show that in the limit of small anharmonicity the Gross-Pitaevskii energy can be minimized amongst the Lowest Landau Level wave functions and use this particular form to get theoretical results in the spirit of [A. Aftalion X. Blanc F. Nier, Phys. Rev. A 73, 011601(R) (2006)]. In particular, we show that the vortex pattern is infinite but not uniform. We also compute numerically the complete vortex structure: it is an Abrikosov lattice strongly distorted near the edges of the condensate with multiply quantized vortices appearing at the center of the trap.
description: 8 pages, 4 figures
Evidence for transit-timing variations of the 11 Myr exoplanet TOI-1227 b
Creators: name: Almenara, J.M.
name: Bonfils, X.
name: Guillot, T.
name: Timmermans, M.
name: Díaz, R.F.
name: et al.
Publisher: name: Zenodo
Year: 2023

description: Ground-Based Transit Observations of TOI-1227 b. Filename: TOI-1227_[Mid-transit UT date]_[Telescope]_[Band].txt

Columns: 

1. Mid-Exposure Time (BJD_TDB)

2. Normalized Flux

3. Normalized Flux Error

4. Exposure Time (seconds)
Discovering Strongly-lensed QSOs From Unresolved Light Curves
Creators: name: Shu, Yiping
name: Belokurov, Vasily
name: Evans, N. Wyn
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We present a new method of discovering galaxy-scale, strongly-lensed QSO systems from unresolved light curves using the autocorrelation function. The method is tested on five rungs of simulated light curves from the Time Delay Challenge 1 that were designed to match the light-curve qualities from existing, ongoing, and forthcoming time-domain surveys such as the Medium Deep Survey of the Panoramic Survey Telescope And Rapid Response System 1, the Zwicky Transient Facility, and the Rubin Observatory Legacy Survey of Space and Time. Among simulated lens systems for which time delays can be successfully measured by current best algorithms, our method achieves an overall true positive rate of 28--58% for doubly-imaged QSOs (doubles) and 36--60% for quadruply-imaged QSOs (quads) while maintains $\lesssim$10% false positive rates. We also apply the method to observed light curves of 22 known strongly-lensed QSOs, and recover 20% of doubles and 25% of quads. The tests demonstrate the capability of our method for discovering strongly-lensed QSOs from major time domain surveys. The performance of our method can be further improved by analysing multi-filter light curves and supplementing with morphological, colour, and/or astrometric constraints. More importantly, our method is particularly useful for discovering small-separation strongly-lensed QSOs, complementary to traditional imaging-based methods.
description: 10 pages, 5 figures, minor edits to match the MNRAS-published version
Discrete Cosmological Self-Similarity And Delta Scuti Stars
Creators: name: Oldershaw, R. L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Within the context of a fractal paradigm that emphasizes nature's well-stratified hierarchical organization, the delta Scuti class of variable stars is investigated for evidence of discrete cosmological self-similarity. Methods that were successfully applied to the RR Lyrae class of variable stars are used to identify Atomic Scale analogues to delta Scuti stars and their relevant range of energy levels. The mass, pulsation mode and fundamental oscillation period of a well-studied delta Scuti star are shown to be quantitatively self-similar to the counterpart parameters of a uniquely identified Atomic Scale analogue. Several additional tests confirm the specificity of the discrete fractal relationship.
description: 15 pages, 1 figure, 3 tables, minor editing, published
ความเป็นเมืองในกวีนิพนธ์ไทยร่วมสมัย
Creators: name: ณัฐธิดา ศิริชัยยงบุญ
Publisher: name: คณะศิลปศาสตร์ มหาวิทยาลัยธรรมศาสตร์
Year: 2016
Subjects: -

description: วรรณวิทัศน์, 16, พฤศจิกายน, 24-46
Threshold of Singularity Formation in the Semilinear Wave Equation
Creators: name: Liebling, Steven L.
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Solutions of the semilinear wave equation are found numerically in three spatial dimensions with no assumed symmetry using distributed adaptive mesh refinement. The threshold of singularity formation is studied for the two cases in which the exponent of the nonlinear term is either $p=5$ or $p=7$. Near the threshold of singularity formation, numerical solutions suggest an approach to self-similarity for the $p=7$ case and an approach to a scale evolving static solution for $p=5$.
description: 6 pages, 7 figures
FIMP Dark Matter in Clockwork/Linear Dilaton Extra-Dimensions
Creators: name: Bernal, Nicolás
name: Donini, Andrea
name: Folgado, Miguel G.
name: Rius, Nuria
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the possibility that Dark Matter (DM) is made of Feebly Interacting Massive Particles (FIMP) interacting just gravitationally with the Standard Model particles in the framework of a Clockwork/Linear Dilaton (CW/LD) model. We restrict here to the case in which the DM particles are scalar fields. This paper extends our previous study of FIMP's in Randall-Sundrum (RS) warped extra-dimensions. As it was the case in the RS scenario, also in the CW/LD model we find a significant region of the parameter space in which the observed DM relic abundance can be reproduced with scalar DM mass in the MeV range, with a reheating temperature varying from 10 GeV to $10^{9}$ GeV. We comment on the similarities of the results in both extra-dimensional models.
description: 21+6 pages, 5 figures. V2: minor changes. Matches version accepted in JHEP
Embodied Visual Navigation with Automatic Curriculum Learning in Real Environments
Creators: name: Morad, Steven D.
name: Mecca, Roberto
name: Poudel, Rudra P. K.
name: Liwicki, Stephan
name: Cipolla, Roberto
Publisher: name: arXiv
Year: 2020
Subjects: subject: Robotics (cs.RO)
subject: Artificial Intelligence (cs.AI)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: We present NavACL, a method of automatic curriculum learning tailored to the navigation task. NavACL is simple to train and efficiently selects relevant tasks using geometric features. In our experiments, deep reinforcement learning agents trained using NavACL significantly outperform state-of-the-art agents trained with uniform sampling -- the current standard. Furthermore, our agents can navigate through unknown cluttered indoor environments to semantically-specified targets using only RGB images. Obstacle-avoiding policies and frozen feature networks support transfer to unseen real-world environments, without any modification or retraining requirements. We evaluate our policies in simulation, and in the real world on a ground robot and a quadrotor drone. Videos of real-world results are available in the supplementary material.
A Polynomial Quantum Algorithm for Approximating the Jones Polynomial
Creators: name: Aharonov, Dorit
name: Jones, Vaughan
name: Landau, Zeph
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The Jones polynomial, discovered in 1984, is an important knot invariant in topology. Among its many connections to various mathematical and physical areas, it is known (due to Witten) to be intimately connected to Topological Quantum Field Theory (TQFT). The works of Freedman, Kitaev, Larsen and Wang provide an efficient simulation of TQFT by a quantum computer, and vice versa. These results implicitly imply the existence of an efficient quantum algorithm that provides a certain additive approximation of the Jones polynomial at the fifth root of unity, e^{2πi/5}, and moreover, that this problem is BQP-complete. Unfortunately, this important algorithm was never explicitly formulated. Moreover, the results mentioned are heavily based on TQFT, which makes the algorithm essentially inaccessible to computer scientists. We provide an explicit and simple polynomial quantum algorithm to approximate the Jones polynomial of an n-strands braid with m crossings at any primitive root of unity e^{2πi/k}, where the running time of the algorithm is polynomial in m,n and k. Our algorithm is based, rather than on TQFT, on well known mathematical results. By the results of Freedman et. al., our algorithm solves a BQP complete problem. The algorithm we provide exhibits a structure which we hope is generalizable to other quantum algorithmic problems. Candidates of particular interest are the approximations of other #P-hard problems, most notably, the partition function of the Potts model, a model which is known to be tightly connected to the Jones polynomial.
description: 19 pages. This is a revised version of our paper quant-ph/0511096. The main change is a much more intuitive and less technical exposition of the Path model representation, which makes the paper much shorter. In addition, we somewhat updated the introduction, corrected various technical errors, and hopefully improved the writing
Story about someone using Verdena's family fishing spot
Creators: name: Parker, Verdena
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2020
Subjects: subject: hup

description: Audio and video files VP-200317-05: Verdena tells a story about her grandmother dealing with someone who fished in her family's fishing spot, in Hupa then in English. Discussion removed from public access out of respect for privacy and/or cultural considerations.
Absence of true localization in many-body localized phases
Creators: name: Kiefer-Emmanouilidis, Maximilian
name: Unanyan, Razmik
name: Fleischhauer, Michael
name: Sirker, Jesko
Publisher: name: arXiv
Year: 2020
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We have recently shown that the logarithmic growth of the entanglement entropy following a quantum quench in a many-body localized (MBL) phase is accompanied by a slow growth of the number entropy, $S_N\sim\ln\ln t$. Here we provide an in-depth numerical study of $S_N(t)$ for the disordered Heisenberg chain and show that this behavior is not transient and persists even for very strong disorder. Calculating the truncated Rényi number entropy $S_N^{(α)}(t)=(1-α)^{-1}\ln\sum_n p^α(n)$ for $α\ll 1$ and $p(n)>p_c$ -- which is sensitive to large number fluctuations occurring with low probability -- we demonstrate that the particle number distribution $p(n)$ in one half of the system has a continuously growing tail. This indicates a slow but steady increase of the number of particles crossing between the partitions in the interacting case, and is in sharp contrast to Anderson localization, for which we show that $S_N^{(α\to 0)}(t)$ saturates for any cutoff $p_c>0$. We show, furthermore, that the growth of $S_N$ is $\mathit not$ the consequence of rare states or rare regions but rather represents typical behavior. These findings provide strong evidence that the interacting system is never fully localized even for very strong but finite disorder.
Spherical-separablility of non-Hermitian Hamiltonians and pseudo-PT-symmetry
Creators: name: Mustafa, Omar
name: Mazharimousavi, S. Habib
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Non-Hermitian but P(phi)T(phi)-symmetrized spherically-separable Dirac and Schrodinger Hamiltonians are considered. It is observed that the descendant Hamiltonians H(r), H(theta), and H(phi) play essential roles and offer some "user-feriendly" options as to which one (or ones) of them is (or are) non-Hermitian. Considering a P(phi)T(phi)-symmetrized H(phi), we have shown that the conventional Dirac (relativistic) and Schrodinger (non-relativistic) energy eigenvalues are recoverable. We have also witnessed an unavoidable change in the azimuthal part of the general wavefunction. Moreover, setting a possible interaction V(theta) in the descendant Hamiltonian H(theta) would manifest a change in the angular theta-dependent part of the general solution too. Whilst some P(phi)T(phi)-symmetrized H(phi) Hamiltonians are considered, a recipe to keep the regular magnetic quantum number m, as defined in the regular traditional Hermitian settings, is suggested. Hamiltonians possess properties similar to the PT-symmetric ones (here the non-Hermitian P(phi)T(phi)-symmetric Hamiltonians) are nicknamed as pseudo-PT-symmetric.
description: 13 pages, 2 figures. This article is a combination of arXiv:0711.3887 and arXiv:0710.5814
Wiedemann-Franz laws and $Sl(2,\mathbb{Z})$ duality in AdS/CMT holographic duals and one-dimensional effective actions for them
Creators: name: Melnikov, Dmitry
name: Nastase, Horatiu
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we study the Wiedemann-Franz laws for transport in 2+1 dimensions, and the action of $Sl(2,\mathbb{Z})$ on this transport, for theories with an AdS/CMT dual. We find that $Sl(2,\mathbb{Z})$ restricts the RG-like flow of conductivities and that the Wiedemann-Franz law is $\bar L =\barκ/(Tσ)=cg_4^2π/3$, from the weakly coupled} gravity dual. In a self-dual theory this value is also the value of $L =κ/(Tσ)$ in the weakly coupled field theory description. Using the formalism of a 0+1 dimensional effective action for both generalized $SYK_q$ models and the $AdS_4$ gravity dual, we calculate the transport coefficients and show how they can be matched at large $q$. We construct a generalization of this effective action that is invariant under $Sl(2,\mathbb{Z})$ and can describe vortex conduction and integer quantum Hall effect.
description: 51 pages, 2 figures; references added, clarifications for comparison with reference, and about our results, added
Stochastic analysis of heterogeneous porous material with modified neural architecture search (NAS) based physics-informed neural networks using transfer learning
Creators: name: Guo, Hongwei
name: Zhuang, Xiaoying
name: Rabczuk, Timon
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: In this work, a modified neural architecture search method (NAS) based physics-informed deep learning model is presented for stochastic analysis in heterogeneous porous material. Monte Carlo method based on a randomized spectral representation is first employed to construct a stochastic model for simulation of flow through porous media. To solve the governing equations for stochastic groundwater flow problem, we build a modified NAS model based on physics-informed neural networks (PINNs) with transfer learning in this paper that will be able to fit different partial differential equations (PDEs) with less calculation. The performance estimation strategies adopted is constructed from an error estimation model using the method of manufactured solutions. A sensitivity analysis is performed to obtain the prior knowledge of the PINNs model and narrow down the range of parameters for search space and use hyper-parameter optimization algorithms to further determine the values of the parameters. Further the NAS based PINNs model also saves the weights and biases of the most favorable architectures, then used in the fine-tuning process. It is found that the log-conductivity field using Gaussian correlation function will perform much better than exponential correlation case, which is more fitted to the PINNs model and the modified neural architecture search based PINNs model shows a great potential in approximating solutions to PDEs. Moreover, a three dimensional stochastic flow model is built to provide a benchmark to the simulation of groundwater flow in highly heterogeneous aquifers. The NAS model based deep collocation method is verified to be effective and accurate through numerical examples in different dimensions using different manufactured solutions.
title: Gra w osiedle, gra urbanistyczna, gra w karty
title: Housing estate game, cards game, urban design game
Creators: name: Bal, Daria
name: Barańska, Aleksandra
name: Bradecki, Tomasz
name: Brol, Monika
name: Dymarska, Natalia
name: Klekotka, Marta
name: Kotarska, Katarzyna
name: Sanigórska, Marta
name: Stachura, Julia
name: Wasik, Małgorzata
name: Wąsińska, Karolina
Publisher: name: Wydawnictwo Politechniki Śląskiej
Year: 2023
Subjects: subject: rzeczywistość rozszerzona
subject: rzeczywistość rozszerzona w edukacji
subject: modele zabudowy mieszkaniowej
subject: modele osiedli
subject: modele przestrzeni miejskich
subject: gra urbanistyczna
subject: zespoły mieszkaniowe

description: Gra w osiedle to projekt będący efektem pracy członkiń i członków studenckiego koła naukowego Urbanmodel działającego przy Politechnice Śląskiej, założonego z inicjatywy dr hab. inż. arch. Tomasza Bradeckiego, prof. PŚ w 2022 roku. Głównym założeniem projektu było stworzenie dwóch unikalnych talii kart do gry, przedstawiających różne modele zabudowy mieszkaniowej. Rozróżnienie na talię 2D oraz 3D ułatwia wyobrażenie sobie jak wyglądają konkretne budynki. Karty mają odniesienie do modeli cyfrowych, umieszczonych w specjalnie wybranych aplikacjach, wykorzystujących rzeczywistość zarówno rozszerzoną, jak i wirtualną, a także aplikacje augment.com oraz sketchfab.com. Pozwala to na jednoczesne kreowanie interakcji w światach rzeczywistym, a także cyfrowym. Gra w osiedle ma na celu zwrócenie uwagi na problematykę intensyfikowania zabudowy mieszkaniowej oraz kształtowania przestrzeni osiedli, demonstruje także znaczenie wskaźników urbanistycznych.
Small-time behavior of beta coalescents
Creators: name: Berestycki, Julien
name: Berestycki, Nathanaël
name: Schweinsberg, Jason
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: For a finite measure $\varLambda$ on $[0,1]$, the $\varLambda$-coalescent is a coalescent process such that, whenever there are $b$ clusters, each $k$-tuple of clusters merges into one at rate $\int_0^1x^{k-2}(1-x)^{b-k}\varLambda(\mathrm{d}x)$. It has recently been shown that if $1
description: Published in at http://dx.doi.org/10.1214/07-AIHP103 the Annales de l'Institut Henri Poincar\'e - Probabilit\'es et Statistiques (http://www.imstat.org/aihp/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Characterization of small high energy proton beams in homogenous and heterogenous media
Creators: name: Charland, Paule
Publisher: name: University of British Columbia
Year: 2009

description: This thesis advances the study of small high energetic photon fields in radiotherapy. Small photon field irradiation is aimed at delivering a uniform dose to a well defined target while minimizing the dose to the surrounding normal tissue. The dosimetry of small x-ray fields is complicated by two factors: the relationship between detector size and field dimensions and the lack of equilibrium in lateral charged particles. Additionally, a longitudinal charged particle disequilibrium is present when materials with different atomic composition and density than water are introduced in a water-like phantom. , Small radiation dosimeters such as diamond, diodes film and a mini-ion chamber have a better spatial resolution to detect the steep dose fall-off at the edge of small photon fields than the large Markus chamber. The line spread function (LSF) of the film densitometer can be estimated by simple measurement of a slit image. Deconvolution of the measured, beam profile from a linear accelerator (linac) with the LSF of a detector yields an estimate of the true inherent beam profile of the linac. Conversely, the LSF of any detector can be estimated by deconvolution from measured data once the inherent profile is known. Similarly, a blurring function representing the finite source size effect of the head of the linac which is missing in a Monte Carlo simulation can be obtained. Because the deconvolution process is highly sensitive to noise, the Total Least Squares (TLS) approach offers a reasonable means to overcome this problem. To deal with inhomogeneous media, the density scaling theorem has been modified to incorporate the effect of a change in atomic number of a material. This modified scaling found an application in the convolution-superposition dose model and provided better agreement with the Monte Carlo generated data. The idea of electronic disequilibrium has been taken into account in our simple depth dose model. A prototype second order differential equation allowed energy to be carried away, analogous to the notion of electron range, and hence we were able to simulate a build-up region for the depth dose curve as well as inhomogeneities.
Two-parameter counter-diabatic driving in quantum annealing
Creators: name: Prielinger, Luise
name: Hartmann, Andreas
name: Yamashiro, Yu
name: Nishimura, Kohji
name: Lechner, Wolfgang
name: Nishimori, Hidetoshi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We introduce a two-parameter approximate counter-diabatic term into the Hamiltonian of the transverse-field Ising model for quantum annealing to accelerate convergence to the solution, generalizing an existing single-parameter approach. The protocol is equivalent to unconventional diabatic control of the longitudinal and transverse fields in the transverse-field Ising model and thus makes it more feasible for experimental realization than an introduction of new terms such as non-stoquastic catalysts toward the same goal of performance enhancement. We test the idea for the $p$-spin model with $p=3$, which has a first-order quantum phase transition, and show that our two-parameter approach leads to significantly larger ground-state fidelity and lower residual energy than those by traditional quantum annealing as well as by the single-parameter method. We also find a scaling advantage in terms of the time to solution as a function of the system size in a certain range of parameters as compared to the traditional methods.
description: 14 pages, 6 figures
Morphological analysis of the cm-wave continuum in the dark cloud LDN1622
Creators: name: Casassus, S.
name: Cabrera, G.
name: Forster, F.
name: Pearson, T. J.
name: Readhead, A. C. S.
name: Dickinson, C.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The spectral energy distribution of the dark cloud LDN1622, as measured by Finkbeiner using WMAP data, drops above 30GHz and is suggestive of a Boltzmann cutoff in grain rotation frequencies, characteristic of spinning dust emission. LDN1622 is conspicuous in the 31 GHz image we obtained with the Cosmic Background Imager, which is the first cm-wave resolved image of a dark cloud. The 31GHz emission follows the emission traced by the four IRAS bands. The normalised cross-correlation of the 31 GHz image with the IRAS images is higher by 6.6sigma for the 12um and 25um bands than for the 60um and 100um bands: C(12+25) = 0.76+/-0.02 and C(60+100) = 0.64+/-0.01. The mid-IR -- cm-wave correlation in LDN 1622 is evidence for very small grain (VSG) or continuum emission at 26-36GHz from a hot molecular phase. In dark clouds and their photon-dominated regions (PDRs) the 12um and 25um emission is attributed to stochastic heating of the VSGs. The mid-IR and cm-wave dust emissions arise in a limb-brightened shell coincident with the PDR of LDN1622, where the incident UV radiation from the Ori OB1b association heats and charges the grains, as required for spinning dust.
description: accepted for publication in ApJ - the complete article with uncompressed figures may be downloaded from http://www.das.uchile.cl/~simon/ftp/l1622.pdf
Blazar jets launched with similar energy per baryon, independently of their power
Creators: name: Rueda-Becerril, Jesus M.
name: Harrison, Amanda O.
name: Giannios, Dimitrios
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The most extreme active galactic nuclei (AGN) are the radio active ones whose relativistic jet propagates close to our line of sight. These objects were first classified according to their emission line features into flat-spectrum radio quasars (FSRQs) and BL Lacertae objects (BL Lacs). More recently, observations revealed a trend between these objects known as the \emph{blazar sequence}, along with an anti-correlation between the observed power and the frequency of the synchrotron peak. In the present work, we propose a fairly simple idea that could account for the whole blazar population: all jets are launched with similar energy per baryon, independently of their power. In the case of FSRQs, the most powerful jets, manage to accelerate to high bulk Lorentz factors, as observed in the radio. As a result, they have a rather modest magnetization in the emission region, resulting in magnetic reconnection injecting a steep particle energy distribution and, consequently, steep emission spectra in the $γ$-rays. For the weaker jets, namely BL Lacs, the opposite holds true; i.e., the jet does not achieve a very high bulk Lorentz factor, leading to more magnetic energy available for non-thermal particle acceleration, and harder emission spectra at frequencies $\gtrsim$ GeV. In this scenario, we recover all observable properties of blazars with our simulations, including the \emph{blazar sequence} for models with mild baryon loading ($50 \lesssim μ\lesssim 80$). This interpretation of the blazar population, therefore, tightly constrains the energy per baryon of blazar jets regardless of their accretion rate.
description: 11 pages, 5 figures, accepted in MNRAS
Story about Verdena's mother being kept out of boarding school
Creators: name: Parker, Verdena
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2020
Subjects: subject: hup

description: Audio and video files VP-200317-04: Verdena tells a story about how her grandmother didn't let Verdena's mother get taken away to boarding school, in Hupa then in English.
Photon emission in a constant magnetic field in 2+1 dimensional space-time
Creators: name: Amaral, J. T. S.
name: Zlatev, S. I.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We calculate by the proper-time method the amplitude of the two-photon emission by a charged fermion in a constant magnetic field in (2+1)-dimensional space-time. The relevant dynamics reduces to that of a supesymmetric quantum-mechanical system with one bosonic and one fermionic degrees of freedom.
description: 18 pages. v2: references added, some significant changes in the introduction
Nonequilibrium Thermodynamics of Non-Ideal Chemical Reaction Networks
Creators: name: Avanzini, Francesco
name: Penocchio, Emanuele
name: Falasco, Gianmaria
name: Esposito, Massimiliano
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: All current formulations of nonequilibrium thermodynamics of open chemical reaction networks rely on the assumption of non-interacting species. We develop a general theory which accounts for interactions between chemical species within a mean-field approach using activity coefficients. Thermodynamic consistency requires that rate equations do not obey to standard mass-action kinetics, but account for the interactions with concentration dependent kinetic constants. Many features of the ideal formulations are recovered. Crucially, the thermodynamic potential and the forces driving non-ideal chemical systems out of equilibrium are identified. Our theory is general and holds for any mean-field expression of the interactions leading to lower bounded free energies.
Stability analysis and μ-synthesis control of brake systems
Creators: name: Lignon, Sylvain
name: Sinou, Jean-Jacques
name: Jezequel, Louis
Publisher: name: arXiv
Year: 2008
Subjects: subject: Classical Physics (physics.class-ph)
subject: Dynamical Systems (math.DS)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The concept of friction-induced brake vibrations, commonly known as judder, is investigated. Judder vibration is based on the class of geometrically induced or kinematic constraint instability. After presenting the modal coupling mechanism and the associated dynamic model, a stability analysis as well as a sensitivity analysis have been conducted in order to identify physical parameters for a brake design avoiding friction-induced judder instability. Next, in order to reduce the size of the instability regions in relation to possible system parameter combinations, robust stability via μ-synthesis is applied. By comparing the unstable regions between the initial and controlled brake system, some general indications emerge and it appears that robust stability via μ-synthesis has some effect on the instability of the brake system.