cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Isotopic effects in chair graphane
Creators: name: Herrero, Carlos P.
name: Ramirez, Rafael
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Graphane is a layered material consisting of a sheet of hydrogenated graphene, with a C:H ratio of 1:1. We study isotopic effects in the properties of chair graphane, where H atoms alternate in a chairlike arrangement on both sides of the carbon layer. We use path-integral molecular dynamics simulations, which allows one to analyze the influence of nuclear quantum effects on equilibrium variables of materials. Finite-temperature properties of graphane are studied in the range 50--1500~K as functions of the isotopic mass of the constituent atoms, using an efficient tight-bonding potential. Results are presented for kinetic and internal energy, atomic mean-square displacements, fluctuations in the C--H bond direction, plus interatomic distances and layer area. At low temperature, substituting $^{13}$C for $^{12}$C gives a fractional change of $-2.6 \times 10^{-4}$ in C--C distance and $-3.9 \times 10^{-4}$ in the graphane layer area. Replacing $^2$H for $^1$H causes a larger fractional change in the C--H bond of $-5.7 \times 10^{-3}$. The isotopic effect in C--C bond distance increases (decreases) by applying a tensile (compressive) in-plane stress. These results are interpreted in terms of a quasiharmonic approximation for the vibrational modes. Similarities and differences with isotopic effects in graphene are discussed.
description: 17 pages, 11 figures, 2 tables
The Geometry of Regular Shear-Free Null Geodesic Congruences, CR functions and their Application to the Flat-Space Maxwell Equations
Creators: name: Kozameh, Carlos
name: Newman, E. T.
name: Silva-Ortigoza, Gilberto
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We describe here what appears to be a new structure that is hidden in all asymptotically vanishing Maxwell fields possessing a non-vanishing total charge. Though we are dealing with real Maxwell fields on real Minkowski space nevertheless, directly from the asymptotic field one can extract a complex analytic world-line defined in complex Minkowski space that gives a unified Lorentz invariant meaning to both the electric and magnetic dipole moments. In some sense the world-line defines a `complex center of charge' around which both electric and magnetic dipole moments vanish. The question of how and where does this complex world-line arise is one of the two main subjects of this work. The other subject concerns what is known in the mathematical literature as a CR structure. In GR, CR structures naturally appear in the physical context of shear-free (or asymptotically shear-free) null geodesic congruences in space-time. For us, the CR structure is associated with the embedding of Penrose's real three-dimensional null infinity, I^+, as a surface in a two complex dimensional space, C^2. It is this embedding, via a complex function, (a CR function), that is our other area of interest. Specifically we are interested in the `decomposition' of the CR function into its real and imaginary parts and the physical information contained in this decomposition.
description: 25 pages
Analyticity of the energy in an Ising spin glass with correlated disorder
Creators: name: Nishimori, Hidetoshi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: The average energy of the Ising spin glass is known to have no singularity along a special line in the phase diagram although there exists a critical point on the line. This result on the model with uncorrelated disorder is generalized to the case with correlated disorder. For a class of correlations in disorder that suppress frustration, we show that the average energy in a subspace of the phase diagram is expressed as the expectation value of a local gauge variable of the $Z_2$ gauge Higgs model, from which we prove that the average energy has no singularity although the subspace is likely to have a phase transition on it. This is a generalization of the result for uncorrelated disorder. Though it is difficult to obtain an explicit expression of the energy in contrast to the case of uncorrelated disorder, an exact closed-form expression of a physical quantity related to the energy is derived in three dimensions using a duality relation. Identities and inequalities are proved for the specific heat and correlation functions.
Thermally activated switching in the presence of non-Gaussian noise
Creators: name: Billings, Lora
name: Dykman, Mark I.
name: Schwartz, Ira B.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the effect of a non-Gaussian noise on interstate switching activated primarily by Gaussian noise. Even weak non-Gaussian noise can strongly change the switching rate. The effect is determined by all moments of the noise distribution. The explicit analytical results are compared with the results of simulations for an overdamped system driven by white Gaussian noise and a Poisson noise. Switching induced by a purely Poisson noise is also discussed.
description: 4 pages, 2 figures, unsolicited report
ВЫМОГАТЕЛЬСТВО: УГОЛОВНО-ПРАВОВАЯ ХАРАКТЕРИСТИКАИ СОВРЕМЕННЫЕ ТЕНДЕНЦИИ
Creators: name: МЕЛЕНТЬЕВ Андрей Валерьевич
Publisher: name: Образование и право
Year: 2020
Subjects: вымогательство
предмет вымогательства
состав преступления
квалификация преступления
преступность
латентность
уголовное право

description: Автор ставит задачу представить уголовно-правовую характеристику вымогательства. В статье рассмотрено понятие «вымогательство». Определены признаки состава преступления. Проанализированы проблемы квалификации вымогательства и отграничение вымогательства от смежных составов преступлений. Представлены критерии общественной опасности вымогательства. Подчеркивается корыстно-насильственный характер вымогательства. Указывается на высокую латентность данного вида преступлений. Говорится о необходимости совершенствования уголовно-правовых мер борьбы с такого рода преступными проявлениями.
Introducing Mindsetting and Brainsetting Education
Creators: name: Pishghadam, Reza
name: Ebrahimi, Shima
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 390303
subject: Higher education
classificationCode: 390305
subject: Professional education and training
classificationCode: 390307
subject: Teacher education and professional development of educators

description: Considering the rapid progress of technology in the fields of cognition, robotics, and artificial intelligence, as well as the abundance and easy access to educational materials in cyberspace, traditional education no longer meets the actual needs of society. Informal education has overcome formal education by placing a greater emphasis on techniques and skills. In this article, two types of education were introduced: a) Mindsetting education (including mind-filling education and mind-developing education) and b) Brainsetting education (including brain-exercising education and brain-generating education). The first relates to thinking and thoughts, and the second is knowledge and skills. In fact, with the advent of intelligent educational systems, there has been a shift from soft, mental, and human approaches to more hard, cerebral, and machine approaches, which teachers and educational specialists need to consider.
Analysing the elasticity difference tensor of general relativity
Creators: name: Vaz, E. G. L. R.
name: Brito, Irene
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The elasticity difference tensor, used in [1] to describe elasticity properties of a continuous medium filling a space-time, is here analysed from the point of view of the space-time connection. Principal directions associated with this tensor are compared with eigendirections of the material metric. Examples concerning spherically symmetric and axially symmetric space-times are then presented.
description: 17 pages
Electronic structure of the ferromagnetic superconductor UCoGe from first principles
Creators: name: de la Mora, Pablo
name: Navarro, O.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The superconductor UCoGe is analyzed with electronic structure calculations using Linearized Augmented Plane Wave method based on Density Functional Theory. Ferromagnetic and antiferromagnetic calculations with and without correlations (via LDA+U) were done. In this compound the Fermi level is situated in a region where the main contribution to DOS comes from the U-5f orbital. The magnetic moment is mainly due to the Co-3d orbital with a small contribution from the U-5f orbital. The possibility of fully non-collinear magnetism in this compound seems to be ruled out. These results are compared with the isostructural compound URhGe, in this case the magnetism comes mostly from the U-5f orbital.
The ratio of shear viscosity to entropy density in generalized theories of gravity
Creators: name: Brustein, Ram
name: Medved, A. J. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Near the horizon of a black brane solution in Anti-de Sitter space, the long-wavelength fluctuations of the metric exhibit hydrodynamic behaviour. For Einstein's theory, the ratio of the shear viscosity of near-horizon metric fluctuations eta to the entropy per unit of transverse volume s is eta/s=1/4 pi. We propose that, in generalized theories of gravity, this ratio is given by the ratio of two effective gravitational couplings and can be different than 1/4 pi. Our proposal implies that eta/s is equal for any pair of gravity theories that can be transformed into each other by a field redefinition. In particular, the ratio is 1/4 pi for any theory that can be transformed into Einstein's theory; such as F(R) gravity. Our proposal also implies that matter interactions -- except those including explicit or implicit factors of the Riemann tensor -- will not modify eta/s. The proposed formula reproduces, in a very simple manner, some recently found results for Gauss-Bonnet gravity. We also make a prediction for eta/s in Lovelock theories of any order or dimensionality.
description: 11 pages
Sequentially estimating the dynamic contact angle of sessile saliva droplets in view of SARS-CoV-2
Creators: name: Bapat, Sudeep R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: Estimating the contact angle of a virus infected saliva droplet is seen to be an important area of research as it presents an idea about the drying time of the respective droplet and in turn of the growth of the underlying pandemic. In this paper we extend the data presented by Balusamy, Banerjee and Sahu [Lifetime of sessile saliva droplets in the context of SARS-CoV-2, Int. J. Heat Mass Transf. 123, 105178 (2021)], where the contact angles are fitted using a newly proposed half-circular wrapped-exponential model, and a sequential confidence interval estimation approach is established which largely reduces both time and cost with regards to data collection.
Nonlinear Dynamic Phenomena in Macroscopic Tunneling
Creators: name: Dekel, G.
name: Farberovich, O. V.
name: Soffer, A.
name: Fleurov, V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Numerical simulations of the NLSE (or GPE) are presented demonstrating emission of short pulses of the matter (light) density formed in the course of tunneling in wave-guided light and/or trapped BEC. The phenomenon is observed under various conditions, for nonlinearities of different signs, zero nonlinearity included. We study, both numerically and analytically, pulsations of matter (light) remaining within the trap and use the results in order to induce emission of sequential pulses by properly narrowing the trap. This allows us to propose a mechanism for a realization of Atom Pulse Laser.
description: 14 pages, 6 figures
My Baby's Movements: a stepped wedge cluster randomised controlled trial to raise maternal awareness of fetal movements during pregnancy: Statistical Analysis Plan
Creators: name: Flenady, Vicki
name: Warrilow, Kara
name: Coory, Michael
name: Weller, Megan
name: Gardener, Glenn
name: Middleton, Philippa
name: Ellwood, David
name: Groom, Katie
name: East, Christine
name: Callander, Emily
name: Boyle, Frances
name: Wojcieszek, Aleena
name: Gordon, Adrienne
name: Normon, Jane
name: Crowther, Caroline
Publisher: name: Zenodo
Year: 2019
Subjects: Decreased fetal movements, stillbirth, best practice, mobile phone application, maternity care, statistical analysis plan

description: This document outlines the statistical analysis plan for primary hypotheses analyses of the My Baby’s Movements trial based in Australia and New Zealand only.   The document will provide details of variables, methodology and analyses undertaken.  This document has been developed based upon information within the study protocol dated 2nd February 2018.
description: The My Baby's Movements trial was funded by the National Health and Medical Research Council (NHMRC) Project Grant Application (APP1067363).  The Stillbirth Foundation Australia provided funding to enable consultation with women in the development of the MBM app. Dr Glenn Gardener was provided a Betty McGrath Fellowship through the Mater Research Institute for the MBM trial. We gratefully thank the Mater Foundation for their contribution. Additional support was provided by the Stillbirth Centre of Research Excellence.
A recalibration of the Hγ luminosity relation with high signal-to-noise Reticon spectra
Creators: name: Millward, Christopher Gordon
Publisher: name: University of British Columbia
Year: 2010

description: 40 Å/mm high signal-to-noise Reticon spectra of 71 O, B, and early A-type stars in 8 open clusters and OB associations along with 37 zero point stars (early A-type stars with reliable trigonometric parallaxes, eclipsing binaries, and visual binaries) have been used to recalibrate the W(Hγ)-absolute magnitude relation. The new empirical calibration for luminosity classes III-V is presented. The calibration has a mean probable dispersion of ±0.28 mag. No spectral type corrections are necessary. The new main sequence calibration averages 0.1 mag. fainter than the Balona & Crampton (1974) calibration. Close agreement with the Petrie (1965) calibration is found for spectral types BO-7. However, the present relation is up to 0.8 mag. brighter than Petrie's 0 star calibration and 0.7 mag. brighter than the A star calibration. The Blaauw (1963) calibration averages 0.4 mag. fainter than the present one over the spectral range 09-B2. The effect of evolution and high V sin i on the relation are investigated. The derived distance modulus of NGC 2244, 11.00±0.27 mag., is in close agreement with other determined values and an explanation as to why Petrie obtained an anomalously low value (9.7±0.1 mag.) is given. Rotational velocities are determined for most stars as well as the central depths of selected lines.
Topology of surface electromyogram signals: hand gesture decoding on Riemannian manifolds
Creators: name: Gowda, Harshavardhana T.
name: Miller, Lee M.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Signal Processing (eess.SP)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Human-Computer Interaction (cs.HC)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences
subject: FOS: Biological sciences
subject: G.3
subject: 53

description: $\textit{Objective.}$ In this article, we present data and methods for decoding hand gestures using surface electromyogram (EMG) signals. EMG-based upper limb interfaces are valuable for amputee rehabilitation, artificial supernumerary limb augmentation, gestural control of computers, and virtual and augmented reality applications. $\textit{Approach.}$ To achieve this, we collect EMG signals from the upper limb using surface electrodes placed at key muscle sites involved in hand movements. Additionally, we design and evaluate efficient models for decoding EMG signals. $\textit{Main results.}$ Our findings reveal that the manifold of symmetric positive definite (SPD) matrices serves as an effective embedding space for EMG signals. Moreover, for the first time, we quantify the distribution shift of these signals across individuals. $\textit{Significance.}$ Overall, our approach demonstrates significant potential for developing efficient and interpretable methods for decoding EMG signals. This is particularly important as we move toward the broader adoption of EMG-based wrist interfaces.
Three dimensional C-, S- and E-transforms
Creators: name: Nesterenko, M.
name: Patera, J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 33-02; 33E99; 42B99; 42C15; 58C40

description: Three dimensional continuous and discrete Fourier-like transforms, based on the three simple and four semisimple compact Lie groups of rank 3, are presented. For each simple Lie group, there are three families of special functions ($C$-, $S$-, and $E$-functions) on which the transforms are built. Pertinent properties of the functions are described in detail, such as their orthogonality within each family, when integrated over a finite region $F$ of the 3-dimensional Euclidean space (continuous orthogonality), as well as when summed up over a lattice grid $F_M\subset F$ (discrete orthogonality). The positive integer $M$ sets up the density of the lattice containing $F_M$. The expansion of functions given either on $F$ or on $F_M$ is the paper's main focus.
description: 24 pages, 13 figures
Full linear Phan-Thien--Tanner fluid model: Exact analytical solutions for steady, start-up, and cessation regimes of shear and extensional flows
Creators: name: Shogin, Dimitri
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Exact, fully explicit, purely real analytical expressions for the material functions describing steady, startup, and cessation regimes of shear flows and of planar, uniaxial, and biaxial extensional flows of full linear Phan-Thien--Tanner fluids are obtained. These expressions, which have no analogs in the literature, are formulated in compact, beautiful forms, partially due to the unique scaling procedure reducing the number of the model parameters from four to one. The properties of the material functions are investigated in detail. For steady extensional flows, the possible shapes of the extensional viscosity curves are described and the conditions for these shapes to occur are determined. For startup flows, it is found when exactly the stress dynamics is oscillatory, and, in this case, a detailed characterization of oscillations is given, which includes expressions for the position and magnitude of stress overshoots and undershoots.
description: 65 pages, 9 tables, and 24 figures
Photometric Objects around Cosmic Webs (PAC) Delineated in a Spectroscopic Survey. I. Methods
Creators: name: Xu, Kun
name: Zheng, Yun
name: Jing, Yipeng
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We provide a method for estimating the projected density distribution $\bar{n}_2w_p(r_p)$ of photometric objects around spectroscopic objects in a redshift survey. This quantity describes the distribution of Photometric sources with certain physical properties (e.g. luminosity, mass, color etc) Around Cosmic webs (PAC) traced by the spectroscopic objects. The method can make full use of current and future deep and wide photometric surveys to explore the formation of galaxies up to medium redshift ($z_s < 2$), with the aid of cosmological redshift surveys that sample only a fairly limited species of objects (e.g. Emission Line Galaxies). As an example, we apply the PAC method to the CMASS spectroscopic and HSC-SSP PDR2 photometric samples to explore the distribution of galaxies for a wide range of stellar mass from $10^{9.0}{\rm M_\odot}$ to $10^{12.0}{\rm M_\odot}$ around massive ones at $z_s\approx 0.6$. Using the abundance matching method, we model $\bar{n}_2w_p(r_p)$ in N-body simulation using MCMC sampling, and accurately measure the stellar-halo mass relation (SHMR) and stellar mass function (SMF) for the whole mass range. We can also measure the conditional stellar mass function (CSMF) of satellites for central galaxies of different mass. The PAC method has many potential applications for studying the evolution of galaxies.
description: 15 pages, 7 figures, accepted for publication in ApJ
Linearized inverse theory applied to direct current resistivity measurements
Creators: name: Plenderleith, Donald H.
Publisher: name: University of British Columbia
Year: 2010

description: Layered resistivity models have been constructed from the potential difference measurements made in direct current resistivity soundings using Backus and Gilbert's linearized inverse theory in a manner similar to that of Oldenburg (1978). The efficiency of the original method has been improved by approximating the one-dimensional structure with a finite number of layers, and by computing the Hankel transforms used in evaluating the Frechet kernels, and solving the forward equation, with a digital filter. Also, the surface resistivity is no longer required thus making the method fully automatic. The constructed model's representation of a hypothetical resistivity structure was tested, varying the starting model, adding up to 20 percent noise to the synthetic data, and decreasing the data density. In all cases the hypothetical structure was recognizably reproduced. With the program's ability to reproduce this structure verified, six Schlumberger soundings in the Anahim Volcanic belt in British Columbia were inverted. Although the setting was not ideal, models which fit the data according to the chi-squared criterion were constructed. A standard deviation of 10 percent was assigned to the data to account for measurement errors, and invalidity of the flat one-dimensional earth approximation made in solving the potential equation. From the models constructed and the known near-surface geology, three integrated interpretations were made. The first is a purely geological interpretation of the low resistivity zones. In the second, they are attributed to increasing temperatures with depth and to the north, and a heat source north of the survey region is hypothesized from an observed north-south resistivity gradient. The third is the most probable interpretation. In it, the heat source to the north is retained because it is inferred from a trend of decreasing average resistivities indicated by the four northernmost soundings, but one of the remaining southern anomalies is questioned, and a geological explanation is given for the other. There was not enough information in this data set to favor either the hot-spot, or the edge effect hypothesis for the genesis of the Anahim Volcanic belt. The two soundings most important to the heat-source-to-the-north hypothesis were linearly appraised. Average models have been constructed with a predetermined standard deviation and, on the basis the low resistivity zones being present, it can be said that the features which form the basis of this hypothesis are resolvable.
Albania Hunkering Down All alone in the Cold War
Creators: name: Terragni, Elisabetta
Publisher: name: La Rivista di Engramma
Year: 2021
Subjects: Albania
Bunkerization
Kolonel Bunker
Lulezo Shqiperi

description: A country of travellers with a millennial history of migration, trade and cultural exchange suddenly found itself frozen, paralyzed during forty years of paranoia and terror that still define its modern history. Olga Tokarczuk, the Polish Nobel laureate of 2020, is right when she says that fluidity, mobility, illusoriness are precisely the qualities that make us civilized. Barbarians don't travel, they simply go to their destination or conduct raids. The feared invasion of Albania never happened. Enver Hoxha, the dictator, was convinced of the opposite, that every power from Yugoslavia to Greece, from NATO to his former allies, the Soviet Union and China, were determined to invade Albania. To counteract the threat he embarked on a bunker building campaign of unthinkable proportion. To be able to understand the political, military, and human consequences of such an undertaking we are obliged to adopt a dual perspective and consider the position of Albania of the 1960s and 1970s and its geopolitical context. You need to squint with your eyes as if you were looking through the gunport of a bunker and see a chain of broken, or better failed, relationships culminating at the time of Mao’s invitation of Nixon to China in 1972, a move that threw a chill on the Sino-Albanian alliance and finally ended the relationship in 1978. It is against this background that the bunkerization of Albania started to save the most isolated country from being invaded. How could they possibly have resisted such an invasion? We know a great deal about the political strategy and the military resistance against enemies, but we know almost nothing about how the bunkers were built; how many factories were put to work producing them; how they were manufactured, transported, and assembled on site; in a word, we don’t know their architecture. How different were those positioned along the coastline versus those perched on treacherous mountain slopes? What was the cost of this staggering operation? How many people were involved, and so on? I will answer these questions from different angles, so as to be able to go back to the beginning as it stands written on the wall of the ruined pyramid in Tirana captured in a striking photograph by Giovanni Chiaramonte. The beginning was when Albania was a place to leave in order to live and not a place to be imprisoned. Today these artefacts are still numerous and they slowly submit to the rule of nature, and recede in accordance with it. Bunkers have no roots, they are simply pushed into the land, there will be no evidence of their construction in future because they lack foundations and, in a long run, this gives me great hope for the Country.
A spectral atlas of post-main-sequence stars in omega Centauri: kinematics, evolution, enrichment and interstellar medium
Creators: name: van Loon, Jacco Th.
name: van Leeuwen, Floor
name: Smalley, Barry
name: Smith, Andrew W.
name: Lyons, Nicola A.
name: McDonald, Iain
name: Boyer, Martha L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a spectral atlas of the post-main-sequence population of the most massive Galactic globular cluster, omega Centauri. Spectra were obtained of more than 1500 stars selected as uniformly as possible from across the (B, B-V) colour-magnitude diagram of the proper motion cluster member candidates of van Leeuwen et al. (2000). The spectra were obtained with the 2dF multi-fibre spectrograph at the Anglo Australian Telescope, and cover the approximate range lambda~3840-4940 Angstroem. We measure the radial velocities, effective temperatures, metallicities and surface gravities by fitting ATLAS9 stellar atmosphere models. We analyse the cluster membership and stellar kinematics, interstellar absorption in the Ca II K line at 3933 Angstroem, the RR Lyrae instability strip and the extreme horizontal branch, the metallicity spread and bimodal CN abundance distribution of red giants, nitrogen and s-process enrichment, carbon stars, pulsation-induced Balmer line emission on the asymptotic giant branch (AGB), and the nature of the post-AGB and UV-bright stars. Membership is confirmed for the vast majority of stars, and the radial velocities clearly show the rotation of the cluster core. We identify long-period RR Lyrae-type variables with low gravity, and low-amplitude variables coinciding with warm RR Lyrae stars. A barium enhancement in the coolest red giants indicates that 3rd dredge-up operates in AGB stars in omega Cen. This is distinguished from the pre-enrichment by more massive AGB stars, which is also seen in our data. The properties of the AGB, post-AGB and UV-bright stars suggest that RGB mass loss may be less efficient at very low metallicity, [Fe/H]<
description: accepted for publication in MNRAS
Relative cubulation of relative strict hyperbolization
Creators: name: Groves, Daniel
name: Lafont, Jean-François
name: Manning, Jason Fox
name: Ruffoni, Lorenzo
Publisher: name: arXiv
Year: 2023
Subjects: subject: Group Theory (math.GR)
subject: Differential Geometry (math.DG)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 20F67, 53C23, 20E26, 57Q15

description: We prove that many relatively hyperbolic groups obtained by relative strict hyperbolization admit a cocompact action on a CAT(0) cubical complex. Under suitable assumptions on the peripheral subgroups, these groups are residually finite and even virtually special. We include some applications to the theory of manifolds, such as the construction of new non-positively curved Riemannian manifolds with residually finite fundamental group, and the existence of non-triangulable aspherical manifolds with virtually special fundamental group.
description: 29 pages, 5 figures. Main document by J.-F. Lafont and L. Ruffoni, appendix by D. Groves and J. F. Manning. Comments welcome! v2: revised final version to appear on the Journal of the London Mathematical Society
Canal do Youtube da Faculdade FaSouza
Creators: name: SOUZA, Marcos Alexandre de
Publisher: name: Zenodo
Year: 2024
Subjects: youtube
canal youtube FaSouza
FaSouza
faculdade
vídeos
webinar
live
palestra

description: Descubra o Canal do Youtube da Faculdade FaSouza e aproveite ao máximo seu conteúdo exclusivo!

Você está procurando por um conteúdo exclusivo e relevante para a sua jornada acadêmica? Então, você precisa conhecer o canal do Youtube da Faculdade FaSouza! Com uma variedade de vídeos interessantes e informativos, este canal é o destino ideal para estudantes em busca de conhecimento extra e dicas úteis.

No canal da FaSouza, você encontrará uma gama de conteúdos abrangendo diversas áreas acadêmicas, desde as ciências humanas até as ciências exatas. Além disso, o canal conta com a participação de professores renomados e especialistas em suas respectivas áreas, garantindo a qualidade e a relevância de cada vídeo.

Então, não perca tempo, inscreva-se no canal do Youtube da Faculdade FaSouza e tenha acesso a um mundo de conhecimento e oportunidades. Prepare-se para se tornar um estudante de destaque e alcançar todos os seus objetivos acadêmicos!
Chiral adiabatic transmission protected by Fermi surface topology
Creators: name: Day, Isidora Araya
name: Vilkelis, Kostas
name: Manesco, Antonio L. R.
name: Bozkurt, A. Mert
name: Fatemi, Valla
name: Akhmerov, Anton R.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We demonstrate that Andreev modes that propagate along a transparent Josephson junction have a perfect transmission at the point where three junctions meet. The chirality and the number of quantized transmission channels is determined by the topology of the Fermi surface and the vorticity of the superconducting phase differences at the trijunction. We explain this chiral adiabatic transmission (CAT) as a consequence of the adiabatic evolution of the scattering modes both in momentum and real space. The dispersion relation of the junction then separates the scattering trajectories by introducing inaccessible regions of phase space. We expect that CAT is observable in nonlocal conductance and thermal transport measurements. Furthermore, because it does not rely on particle-hole symmetry, CAT is also possible to observe directly in metamaterials.
description: 14 pages, 8 figures
Measuring magnetic flux suppression in high-power laser-plasma interactions
Creators: name: Campbell, P. T.
name: Walsh, C. A.
name: Russell, B. K.
name: Chittenden, J. P.
name: Crilly, A.
name: Fiksel, G.
name: Gao, L.
name: Igumenshchev, I. V.
name: Nilson, P. M.
name: Thomas, A. G. R.
name: Krushelnick, K.
name: Willingale, L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Biermann battery magnetic field generation driven by high power laser-solid interactions is explored in experiments performed with the OMEGA EP laser system. Proton deflectometry captures changes to the strength, spatial profile, and temporal dynamics of the self-generated magnetic fields as the target material or laser intensity is varied. Measurements of the magnetic flux during the interaction are used to help validate extended magnetohydrodynamic (MHD) simulations. Results suggest that kinetic effects cause suppression of the Biermann battery mechanism in laser-plasma interactions relevant to both direct and indirect-drive inertial confinement fusion. Experiments also find that more magnetic flux is generated as the target atomic number is increased, which is counter to a standard MHD understanding.
description: 9 pages, 5 figures
Gravitational production of KK states
Creators: name: Bambi, Cosimo
name: Urban, Federico R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Gravitational particle production in the context of braneworlds is considered from a phenomenological point of view. The production of KK modes for bulk fields is discussed and their abundances computed. The results have been applied to some specific fields such as gravitinos and axions, and their cosmologies have been outlined, exemplifying the constraints on the properties of the extra dimensional model in each case.
description: 10 pages, 1 figure
Non-invertible symmetry-protected topological order in a group-based cluster state
Creators: name: Fechisin, Christopher
name: Tantivasadakarn, Nathanan
name: Albert, Victor V.
Publisher: name: arXiv
Year: 2023
Subjects: 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: Despite growing interest in beyond-group symmetries in quantum condensed matter systems, there are relatively few microscopic lattice models explicitly realizing these symmetries, and many phenomena have yet to be studied at the microscopic level. We introduce a one-dimensional stabilizer Hamiltonian composed of group-based Pauli operators whose ground state is a $G\times \text{Rep}(G)$-symmetric state: the $G \textit{ cluster state}$ introduced in Brell, New Journal of Physics 17, 023029 (2015) [at http://doi.org/10.1088/1367-2630/17/2/023029]. We show that this state lies in a symmetry-protected topological (SPT) phase protected by $G\times \text{Rep}(G)$ symmetry, distinct from the symmetric product state by a duality argument. We identify several signatures of SPT order, namely protected edge modes, string order parameters, and topological response. We discuss how $G$ cluster states may be used as a universal resource for measurement-based quantum computation, explicitly working out the case where $G$ is a semidirect product of abelian groups.
description: 30+13 pages, 7 figures. v2: added Sec IV.C, Appendix I, and several references
Bouncing with shear: Implications from quantum cosmology
Creators: name: Rajeev, Karthik
name: Mondal, Vikramaditya
name: Chakraborty, Sumanta
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider the introduction of anisotropy in a class of bouncing models of cosmology. The presence of anisotropy often spells doom on bouncing models, since the energy density due to the anisotropic stress outweighs that of other matter components, as the universe contracts. Different suggestions have been made in the literature to resolve this pathology, classically. Here, we introduce a family of bouncing models, in which the shear density can be tuned to either allow or forbid classical bouncing scenarios. Following this, we show that quantum cosmological considerations can drastically change the above scenario. Most importantly, we find that quantum effects can enable a bounce, even when the anisotropic stress is large enough to forbid the same classically. We employ the solutions of the appropriate mini-superspace Wheeler-DeWitt equation for homogeneous, but anisotropic cosmologies, with the boundary condition that the universe is initially contracting. Intriguingly, the solution to the Wheeler-DeWitt equation exhibit an interesting phase transition-like behaviour, wherein, the probability to have a bouncing universe is precisely unity before the shear density reaches a critical value and then starts to decrease abruptly as the shear density increases further. We verified our findings using the tools of the Lorentzian quantum cosmology, along with the application of the Picard-Lefschetz theory. In particular, the semi-classical probability for a bounce has been re-derived from the imaginary component of the on-shell effective action, evaluated at the complex saddle points. Implications and future directions have also been discussed.
description: This article is dedicated to the memory of Paddy (Prof. T. Padmanabhan), who incidentally started his monumental career with quantum cosmology
Materials with a desired refraction coefficient can be made by embedding small particles
Creators: name: Ramm, A. G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: A method is proposed to create materials with a desired refraction coefficient, possibly negative one. The method consists of embedding into a given material small particles. Given $n_0(x)$, the refraction coefficient of the original material in a bounded domain $D \subset \R^3$, and a desired refraction coefficient $n(x)$, one calculates the number $N(x)$ of small particles, to be embedded in $D$ around a point $x \in D$ per unit volume of $D$, in order that the resulting new material has refraction coefficient $n(x)$.
description: 35J05, 35J10, 70F10, 74J25, 81U40, 81V05
From Library Portability to Para-rehosting: Natively Executing Microcontroller Software on Commodity Hardware
Creators: name: Li, Wenqiang
name: Guan, Le
name: Lin, Jingqiang
name: Shi, Jiameng
name: Li, Fengjun
Publisher: name: arXiv
Year: 2021
Subjects: subject: Programming Languages (cs.PL)
subject: Cryptography and Security (cs.CR)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Finding bugs in microcontroller (MCU) firmware is challenging, even for device manufacturers who own the source code. The MCU runs different instruction sets than x86 and exposes a very different development environment. This invalidates many existing sophisticated software testing tools on x86. To maintain a unified developing and testing environment, a straightforward way is to re-compile the source code into the native executable for a commodity machine (called rehosting). However, ad-hoc re-hosting is a daunting and tedious task and subject to many issues (library-dependence, kernel-dependence and hardware-dependence). In this work, we systematically explore the portability problem of MCU software and propose pararehosting to ease the porting process. Specifically, we abstract and implement a portable MCU (PMCU) using the POSIX interface. It models common functions of the MCU cores. For peripheral specific logic, we propose HAL-based peripheral function replacement, in which high-level hardware functions are replaced with an equivalent backend driver on the host. These backend drivers are invoked by well-designed para-APIs and can be reused across many MCU OSs. We categorize common HAL functions into four types and implement templates for quick backend development. Using the proposed approach, we have successfully rehosted nine MCU OSs including the widely deployed Amazon FreeRTOS, ARM Mbed OS, Zephyr and LiteOS. To demonstrate the superiority of our approach in terms of security testing, we used off-the-shelf dynamic analysis tools (AFL and ASAN) against the rehosted programs and discovered 28 previously-unknown bugs, among which 5 were confirmed by CVE and the other 19 were confirmed by vendors at the time of writing.
description: 18 pages, 4 figures, Network and Distributed Systems Security (NDSS) Symposium 2021
The birth place of the type Ic Supernova 2007gr
Creators: name: Crockett, R. Mark
name: Maund, Justyn R.
name: Smartt, Stephen J.
name: Mattila, Seppo
name: Pastorello, Andrea
name: Smoker, Jonathan
name: Stephens, Andrew W.
name: Fynbo, Johan
name: Eldridge, John J.
name: Danziger, I. John
name: Benn, Christopher R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report our attempts to locate the progenitor of the peculiar type Ic SN 2007gr in HST pre-explosion images of the host galaxy, NGC 1058. Aligning adaptive optics Altair/NIRI imaging of SN 2007gr from the Gemini (North) Telescope with the pre-explosion HST WFPC2 images, we identify the SN position on the HST frames with an accuracy of 20 mas. Although nothing is detected at the SN position we show that it lies on the edge of a bright source, 134+/-23 mas (6.9 pc) from its nominal centre. Based on its luminosity we suggest that this object is possibly an unresolved, compact and coeval cluster and that the SN progenitor was a cluster member, although we note that model profile fitting favours a single bright star. We find two solutions for the age of this assumed cluster; 7-/+0.5 Myrs and 20-30 Myrs, with turn-off masses of 28+/-4 Msun and 12-9 Msun respectively. Pre-explosion ground-based K-band images marginally favour the younger cluster age/higher turn-off mass. Assuming the SN progenitor was a cluster member, the turn-off mass provides the best estimate for its initial mass. More detailed observations, after the SN has faded, should determine if the progenitor was indeed part of a cluster, and if so allow an age estimate to within ~2 Myrs thereby favouring either a high mass single star or lower mass interacting binary progenitor.
description: 12 pages, 3 figures, resolution of fig 1. has been reduced, some revision based on referee's comments, Accepted ApJL 27 Nov 2007
Effective-mass tensor of the two-body bound states and the quantum-metric tensor of the underlying Bloch states
Creators: name: Iskin, M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: By considering an onsite attraction between a spin-$\uparrow$ and a spin-$\downarrow$ fermion in a multiband tight-binding lattice, here we study the two-body spectrum, and derive an exact relation between the inverse of the effective-mass tensor of the lowest bound states and the quantum-metric tensor of the underlying Bloch states. In addition to the intraband (or the so-called conventional) contribution that depends only on the single-particle spectrum and the interband (or the so-called geometric) contribution that is controlled by the quantum metric, our generalized relation has an additional interband contribution that depends on the so-called band-resolved quantum metric. All of our analytical expressions are applicable to those multiband lattices that simultaneously exhibit time-reversal symmetry and fulfill the condition on spatially-uniform pairing. As a nontrivial illustration we analyze the two-body problem in a Kagome lattice with nearest-neighbor hoppings, and show that the exact relation provides a perfect benchmark.
description: 7 pages with 3 figures; to appear in PRA
Metzgeria Raddi 1818
Creators: name: Sukkharak, Phiangphak
name: Chantanaorrapint, Sahut
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Plantae
Marchantiophyta
Jungermanniopsida
Metzgeriales
Metzgeriaceae
Metzgeria

description: Metzgeria Raddi (1818: 34)
Type species: — Metzgeria furcata (L.) Corda (= Jungermannia furcata Linnaeus (1753: 1136)) designated by Grolle & So (2002) (Costa 2008).
description: Published as part of Sukkharak, Phiangphak & Chantanaorrapint, Sahut, 2020, The liverwort genus Metzgeria (Metzgeriaceae, Marchantiophyta) in Thailand, pp. 251-262 in Phytotaxa 441 (3) on page 252, DOI: 10.11646/phytotaxa.441.3.2, http://zenodo.org/record/13872573
Extension of the Dip-test Repertoire -- Efficient and Differentiable p-value Calculation for Clustering
Creators: name: Bauer, Lena G. M.
name: Leiber, Collin
name: Böhm, Christian
name: Plant, Claudia
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Over the last decade, the Dip-test of unimodality has gained increasing interest in the data mining community as it is a parameter-free statistical test that reliably rates the modality in one-dimensional samples. It returns a so called Dip-value and a corresponding probability for the sample's unimodality (Dip-p-value). These two values share a sigmoidal relationship. However, the specific transformation is dependent on the sample size. Many Dip-based clustering algorithms use bootstrapped look-up tables translating Dip- to Dip-p-values for a certain limited amount of sample sizes. We propose a specifically designed sigmoid function as a substitute for these state-of-the-art look-up tables. This accelerates computation and provides an approximation of the Dip- to Dip-p-value transformation for every single sample size. Further, it is differentiable and can therefore easily be integrated in learning schemes using gradient descent. We showcase this by exploiting our function in a novel subspace clustering algorithm called Dip'n'Sub. We highlight in extensive experiments the various benefits of our proposal.