cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Forces on wheels and fuel consumption in cars
Creators: name: Güémez, J.
name: Fiolhais, M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Physics Education (physics.ed-ph)
subject: FOS: Physical sciences

description: Motivated by real classroom discussions, we analyse the forces acting on moving vehicles, specifically friction forces on the wheels. In usual cars, with front-wheel drive, when the car accelerates these forces are in the forward direction in the front wheels, but they are in the opposite direction in the rear wheels. The situation may be intriguing for students, but it may also be helpful and stimulating to clarify the role of friction forces on rolling objects. In this article we also study thermodynamical aspects of an accelerating car, relating the distance traveled with the amount of fuel consumed. The fuel consumption is explicitly shown to be Galilean invariant and we identify the Gibbs free energy as the relevant quantity that enters in the thermodynamical description of the accelerating car. The more realistic case of the car's motion taking into account the dragging forces is also discussed.
description: 10 pages, 1 figure
DigEdTnT - Digital Edition Creation Pipelines: Tools and Transitions
Creators: name: Pollin, Christopher
name: Strutz, Sabrina
name: Steiner, Christian
name: Klug, Helmut
Publisher: name: Zenodo
Year: 2023
Subjects: Digitale Edition
Tools
Workflow
Transkription
Annotieren
Archivierung
Veröffentlichung
Werkzeuge
DHd2023

description: Eine Posterpräsentation auf der 9. Tagung des Verbands "Digital Humanities im deutschsprachigen Raum" - DHd 2023 Open Humanities Open Culture
Study on two Methods for Nonlinear Force-free Extrapolation Based on Semi-Analytical Field
Creators: name: S., Liu
name: Q., Zhang H.
name: T, Su J. T. Song M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: In this paper, two semi-analytical solutions of force free fields (\citeauthor{low90}, \citeyear{low90}) have been used to test two nonlinear force-free extrapolation methods. One is the boundary integral equation (BIE) method developed by \citeauthor{yan00} (\citeyear{yan00}), and another is the approximate vertical integration (AVI) method developed by \citeauthor{son06} (\citeyear{son06}). Some improvements for the AVI method have been taken to avoid the singular points in the process of calculation. It is found that the correlation coefficients between the first semi-analytical field and extrapolated field by BIE, and also that by improved AVI, are greater than $90\%$ below a height 10 of the $64 \times 64$ lower boundary. While for the second semi-analytical field, these correlation coefficients are greater than $80\%$ below the same relative height. Although the differences between the semi-analytical solutions and the extrapolated fields exist for both BIE and AVI methods, these two methods can give reliable results for the height of about 15$\%$ of the extent of the lower boundary.
description: 19 pages, 11 figures. solar physics 2011
Vorwort zu "Topik zwischen Modellierung und Operationalisierung"
Creators: name: Hinzmann, Maria
Publisher: name: Zenodo
Year: 2020
Subjects: Literaturwissenschaft, Reiseliteraturforschung, Kulturwissenschaft, Interkulturelle Germanistik, Postcolonial Studies, Literaturtheorie, Rhetorik, Digital Humanities, Geschichtswissenschaft, Sozialwissenschaft

description: Diese Datei ist das Vorwort des folgenden Buchs: https://www.transcript-verlag.de/978-3-8376-5227-7/topik-zwischen-modellierung-und-operationalisierung/.
ALMA Observations of the Orion Proplyds
Creators: name: Mann, Rita K.
name: Di Francesco, James
name: Johnstone, Doug
name: Andrews, Sean M.
name: Williams, Jonathan P.
name: Bally, John
name: Ricci, Luca
name: Hughes, A. Meredith
name: Matthews, Brenda C.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present ALMA observations of protoplanetary disks ("proplyds") in the Orion Nebula Cluster. We imaged 5 individual fields at 856um containing 22 HST-identified proplyds and detected 21 of them. Eight of those disks were detected for the first time at submillimeter wavelengths, including the most prominent, well-known proplyd in the entire Orion Nebula, 114-426. Thermal dust emission in excess of any free-free component was measured in all but one of the detected disks, and ranged between 1-163 mJy, with resulting disk masses of 0.3-79 Mjup. An additional 26 stars with no prior evidence of associated disks in HST observations were also imaged within the 5 fields, but only 2 were detected. The disk mass upper limits for the undetected targets, which include OB stars, theta1Ori C and theta1Ori F, range from 0.1-0.6 Mjup. Combining these ALMA data with previous SMA observations, we find a lack of massive (>3 Mjup) disks in the extreme-UV dominated region of Orion, within 0.03 pc of O-star theta1Ori C. At larger separations from theta1Ori C, in the far-UV dominated region, there is a wide range of disk masses, similar to what is found in low-mass star forming regions. Taken together, these results suggest that a rapid dissipation of disk masses likely inhibits potential planet formation in the extreme-UV dominated regions of OB associations, but leaves disks in the far-UV dominated regions relatively unaffected.
description: ApJ, in press
Full-Scale Spacecraft Simulator Design for a 2D Zero Gravity Small Body Surface Sampling Validation
Creators: name: Mongelli, Marco
Publisher: name: University of Illinois at Chicago
Year: 2023

description: NASA is developing several Touch-And-Go (TAG) classes of missions. These types of missions like the OSIRIS-REx asteroid sample return [1] or a comet sample return mission (CSSR)[2], consist usually in three phases: propulsive approach to the target, sampling and propulsion to move the spacecraft away from the target. The develop of TAG mission, from concept to realization, is usually divided in two phases: Phase I discusses the major trades that could affect the mission architecture; Phase II focuses in detail on the design. This project of a spacecraft emulator fits into phase II and specifically on the way the spacecraft could react in absence of gravity while the Sample Acquisition System (SAS) is collecting the sample. A full- scale spacecraft on a 2D zero-friction environment has been design. Also a propulsion system has been implemented to re-create the full dynamic of a spacecraft in space.
Comparison of Nonlinear Force-free Field and Potential Field in the Quiet Sun
Creators: name: S., Liu
name: Q., Zhang H.
name: T, Su J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: In this paper, a potential field extrapolation and three nonlinear force-free (NLFF) field extrapolations (optimization, direct boundary integral (DBIE) and approximate vertical integration (AVI) methods) are used to study the spatial configuration of magnetic field in the quiet Sun. It is found that the strength differences between the three NLFF and potential fields exist in the low layers. However, they tend to disappear as the height increases, which are of the order of 0.1 G when the height exceeds $\sim$ 2000 km above the photosphere. The absolute azimuth difference between one NLFF field and the potential field is as follows: for the optimization field, it decreases evidently as the height increases; for the DBIE field, it almost keeps constant and shows no significant change as the height increases; for the AVI field, it increases slowly as the height increases. The analysis shows that the reconstructed NLFF fields deviate significantly from the potential field in the quiet Sun.
description: 20 pages, 9 figures. solar physics 2011
Closing borders is supposed to create a sense of security for those within. (…) ‘protecting’ borders also suggests that there is something to be protected from.
Creators: name: Wisthaler, Verena
Publisher: name: Eurac Research
Year: 2022

description: Following the Czech example, Austria introduced strict border controls on the Austro-Slovak borders on September 30 to prevent human trafficking, as announced by the Austrian minister of Interior. Initially for ten days, police will now stop cars, vans and trucks at the border and will intensify controls in the immediate proximity of the border. Verena Wisthaler spoke with Dr. Judith Kohlenberger, expert on refugees and migration, on the efficiency of such measures.
An empirical model for $pp$ scattering and geometrical scaling
Creators: name: Pancheri, G.
name: Fagundes, D. A.
name: Grau, A.
name: Srivastava, Yogendra N.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present the result of an empirical model for elastic $pp$ scattering at LHC which indicates that the asymptotic black disk limit ${\cal R}=\sigel/\sigtot\rightarrow1/2$ is not yet reached and discuss the implications on classical geometrical scaling behavior. We propose a geometrical scaling law for the position of the dip in elastic $pp$ scattering which allows to make predictions valid both for intermediate and asymptotic energies.
description: 7 pages, 6 figures. Based on talk given by G. Pancheri at LC13: Exploring QCD from the infrared regime to heavy flavour scales at B-factories, the LHC and a Linear Collider. To be published by Nuovo Cimento in Proceedings of LC13- Trento 16-20, September 2013
Diversity of the Oral Microbiome Between Dentate and Edentulous Individuals
Creators: name: Gazdeck, Robert Kyle
Publisher: name: University of Illinois at Chicago
Year: 2023

description: Objective: Measurement of saliva microbes is promoted as a way to detect oral and systemic disease, yet it is also reported that a multitude of factors affect the oral microbiome. Differences in the saliva microbiome of subjects with and without dentition were assessed. Subjects and Methods: 50 dentate and 50 edentulous subjects provided saliva samples after removal of dentures in the later group. 16s rRNA gene sequencing, followed by QIIME- based data processing and statistical analysis, was done to detect changes in makeup of the salivary microbiome in the two groups. Results: Twenty-six taxa assigned to a genus were differentially abundant between the two groups. Bacteria diversity decreased in the edentulous group. Major differentially abundant genera were: Clostridia, Actinomyces, Shuttleworthia, and Veillonella. Remarkably, 25 of the differences in taxa were decreases that occur in the edentulous group. The only exception was the genus Streptococcus. Importantly, the decrease in specific genera in the edentulous group was detected reproducibly whether we analyzed all 100 samples at once or 50 at a time as independent datasets. Conclusion: There is greater diversity in the salivary microbiome of dentate individuals compared to edentulous individuals. Furthermore, measurement of 16s rRNA genes in the bacteria of the saliva can be used to reproducibly measure changes in the oral microbiome that occur with edentulism.
Extracting a bilingual semantic grammar from FrameNet-annotated corpora
Creators: name: Dannélls, Dana
name: Grūzītis, Normunds
Publisher: name: arXiv
Year: 2014
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: We present the creation of an English-Swedish FrameNet-based grammar in Grammatical Framework. The aim of this research is to make existing framenets computationally accessible for multilingual natural language applications via a common semantic grammar API, and to facilitate the porting of such grammar to other languages. In this paper, we describe the abstract syntax of the semantic grammar while focusing on its automatic extraction possibilities. We have extracted a shared abstract syntax from ~58,500 annotated sentences in Berkeley FrameNet (BFN) and ~3,500 annotated sentences in Swedish FrameNet (SweFN). The abstract syntax defines 769 frame-specific valence patterns that cover 77.8% examples in BFN and 74.9% in SweFN belonging to the shared set of 471 frames. As a side result, we provide a unified method for comparing semantic and syntactic valence patterns across framenets.
The time-dependent exchange-correlation functional for a Hubbard dimer: quantifying non-adiabatic effect
Creators: name: Fuks, Johanna I.
name: Farzanehpour, Mehdi
name: Tokatly, Ilya V.
name: Appel, Heiko
name: Kurth, Stefan
name: Rubio, Angel
Publisher: name: arXiv
Year: 2013
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We address and quantify the role of non-adiabaticity ("memory effects") in the exchange-correlation (xc) functional of time-dependent density functional theory (TDDFT) for describing non-linear dynamics of many-body systems. Time-dependent resonant processes are particularly challenging for available TDDFT approximations, due to their strong non-linear and non-adiabatic character. None of the known approximate density functionals are able to cope with this class of problems in a satisfactory manner. In this work we look at the prototypical example of the resonant processes by considering Rabi oscillations within the exactly soluble 2-site Hubbard model. We construct the exact adiabatic xc functional and show that (i) it does not reproduce correctly resonant Rabi dynamics, (ii) there is a sizable non-adiabatic contribution to the exact xc potential, which turns out to be small only at the beginning and at the end of the Rabi cycle when the ground state population is dominant. We then propose a "two-level" approximation for the time-dependent xc potential which can capture Rabi dynamics in the 2-site problem. It works well both for resonant and for detuned Rabi oscillations and becomes essentially exact in the linear response regime. This new, fully non-adiabatic and explicit density functional constitutes one of the main results of the present work.
description: 8 pages, 5 figures
HALOGAS observations of NGC 4414: fountains, interaction, and ram pressure
Creators: name: de Blok, W. J. G.
name: Józsa, G. I. G.
name: Patterson, M.
name: Gentile, G.
name: Heald, G. H.
name: Jütte, E.
name: Kamphuis, P.
name: Rand, R. J.
name: Serra, P.
name: Walterbos, R. A. M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present deep HI imaging of the nearby spiral galaxy NGC 4414, taken as part of the Westerbork HALOGAS (Hydrogen Accretion in LOcal GAlaxieS) survey. The observations show that NGC 4414 can be characterized by a regularly rotating inner HI disk, and a more disturbed outer disk. Modeling of the kinematics shows that the outer disk is best described by a U-shaped warp. Deep optical imaging also reveals the presence of a low surface brightness stellar shell, indicating a minor interaction with a dwarf galaxy at some stage in the past. Modeling of the inner disk suggests that about 4 percent of the inner HI is in the form of extra-planar gas. Because of the the disturbed nature of the outer disk, this number is difficult to constrain for the galaxy as a whole. These new, deep observations of NGC 4414 presented here show that even apparently undisturbed galaxies are interacting with their environment.
description: Accepted for publication in Astronomy and Astrophysics
The regulatory switch of F1-ATPase studied by single-molecule FRET in the ABEL Trap
Creators: name: Bockenhauer, Samuel D.
name: Duncan, Thomas M.
name: Moerner, W. E.
name: Boersch, Michael
Publisher: name: arXiv
Year: 2014
Subjects: subject: Biomolecules (q-bio.BM)
subject: FOS: Biological sciences

description: F1-ATPase is the soluble portion of the membrane-embedded enzyme FoF1-ATP synthase that catalyzes the production of adenosine triphosphate in eukaryotic and eubacterial cells. In reverse, the F1 part can also hydrolyze ATP quickly at three catalytic binding sites. Therefore, catalysis of 'non-productive' ATP hydrolysis by F1 (or FoF1) must be minimized in the cell. In bacteria, the epsilon subunit is thought to control and block ATP hydrolysis by mechanically inserting its C-terminus into the rotary motor region of F1. We investigate this proposed mechanism by labeling F1 specifically with two fluorophores to monitor the C-terminus of the epsilon subunit by Förster resonance energy transfer. Single F1 molecules are trapped in solution by an Anti-Brownian electrokinetic trap which keeps the FRET-labeled F1 in place for extended observation times of several hundreds of milliseconds, limited by photobleaching. FRET changes in single F1 and FRET histograms for different biochemical conditions are compared to evaluate the proposed regulatory mechanism.
description: 14 pages, 5 figures
High Resolution X-ray Spectroscopy of the Local Hot Gas along the 3C 273 Sightline
Creators: name: Fang, Taotao
name: Jiang, Xiaochuan
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: X-ray observations of highly ionized metal absorption lines at z=0 provide critical information of the hot gas distribution in and around the Milky Way. We present a study of more than ten-year Chandra and XMM-Newton observations of 3C 273, one of the brightest extragalactic X-ray sources. Compared with previous work, We obtain much tighter constraints of the physical properties of the X-ray absorber. We also find a large, non-thermal velocity at ~ 100 - 150 km/s is the main reason for the higher line equivalent width when compared with other sightlines. Using joint analysis with X-ray emission and ultraviolet observations, we derive a size of 5 - 15 kpc and a temperature of (1.5-1.8) 10^6 K for the X-ray absorber. The 3C 273 sightline passes through a number of Galactic structures, including the radio Loop I, IV, the North Polar Spur, and the neighborhood of the newly discovered "Fermi bubbles". We argue that the X-ray absorber is unlikely associated with the nearby radio Loop I and IV; however, the non-thermal velocity can be naturally explained as the result of the expansion of the "Fermi bubbles". Our data implies an shock-expansion velocity of 200 - 300 km/s. Our study indicates a likely complex environment for the production of the Galactic X-ray absorbers along different sightlines, and highlights the significance of probing galactic feedback with high resolution X-ray spectroscopy.
description: 5 pages, 3 figures, accepted for publication in ApJL
Sharp capacity estimates for annuli in weighted R^n and in metric spaces
Creators: name: Björn, Anders
name: Björn, Jana
name: Lehrbäck, Juha
Publisher: name: arXiv
Year: 2013
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 31C45 (Primary), 30C65, 30L99, 31B15, 31C15, 31E0 (Secondary)

description: We obtain estimates for the nonlinear variational capacity of annuli in weighted R^n and in metric spaces. We introduce four different (pointwise) exponent sets, show that they all play fundamental roles for capacity estimates, and also demonstrate that whether an end point of an exponent set is attained or not is important. As a consequence of our estimates we obtain, for instance, criteria for points to have zero (resp. positive) capacity. Our discussion holds in rather general metric spaces, including Carnot groups and many manifolds, but it is just as relevant on weighted R^n. Indeed, to illustrate the sharpness of our estimates, we give several examples of radially weighted R^n, which are based on quasiconformality of radial stretchings in R^n.
description: 42 pages
Extended Gauss-Bonnet gravities in Weyl geometry
Creators: name: Jimenez, Jose Beltran
name: Koivisto, Tomi S.
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this paper we consider an extended Gauss-Bonnet gravity theory in arbitrary dimensions and in a space provided with a Weyl connection, which is torsionless but not metric-compatible, the non-metricity tensor being determined by a vector field. The considered action consists of the usual Einstein-Hilbert action plus all the terms quadratic in the curvature that reduce to the usual Gauss-Bonnet term for vanishing Weyl connection, i.e., when only the Levi-Civita part of the connection is present. We expand the action in terms of Riemannian quantities and obtain vector-tensor theories. We find that all the free parameters only appear in the kinetic term of the vector field so that two branches are possible: one with a propagating vector field and another one where the vector field does not propagate. We focus on the propagating case. We find that in 4 dimensions, the theory is equivalent to Einstein's gravity plus a Proca field. This field is naturally decoupled from matter so that it represents a natural candidate for dark matter. Also in d=4, we discuss a non-trivial cubic term in the curvature that can be constructed without spoiling the second order nature of the field equations because it leads to the vector-tensor Horndeski interaction. In arbitrary dimensions, the theory becomes more involved. We show that, even though the vector field presents kinetic interactions which do not have U(1) symmetry, there are no additional propagating degrees of freedom with respect to the usual massive case. Interestingly, we show that this relies on the fact that the corresponding Stueckelberg field belongs to a specific class within the general Horndeski theories. Finally, since Weyl geometries are the natural ground to build scale invariant theories, we apply the usual Weyl-gauging in order to make the Horndeski action locally scale invariant and discuss on new terms that can be added.
description: 15 pages, no figures
H_1-semistability for projective groups
Creators: name: Biswas, Indranil
name: Mj, Mahan
Publisher: name: arXiv
Year: 2014
Subjects: subject: Geometric Topology (math.GT)
subject: Group Theory (math.GR)
subject: FOS: Mathematics

description: We initiate the study of the asymptotic topology of groups that can be realized as fundamental groups of smooth complex projective varieties with holomorphically convex universal covers (these are called here as holomorphically convex groups). We prove the $H_1$-semistability conjecture of Geoghegan for holomorphically convex groups. In view of a theorem of Eyssidieux, Katzarkov, Pantev and Ramachandran \cite{ekpr}, this implies that linear projective groups satisfy the $H_1$-semistability conjecture.
description: Corrected version of arXiv:1203.4520 (withdrawn); main result is weaker
Solar sources of the geoeffective events in September 2011
Creators: name: Palacios, J.
name: Guerrero, A.
name: Cid, C.
name: Saiz, E.
name: Cerrato, Y.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We investigate the geoeffective events happened from 8 to 20 Sept 2011, analysing the most plausible solar sources of these events, where coronal mass ejections and coronal holes play a fundamental role. The physical properties of the coronal holes, such as area and magnetic field, are studied through the Solar Dynamics Observatory instruments: AIA 193 Å images and HMI longitudinal magnetograms. The active regions which are the origin of the coronal mass ejections are analysed in AIA and SoHO-LASCO data.
description: Conference Proceeding: Highlights of Spanish Astrophysics VII. Edited by J. C. Guirado, L.M. Lara, V. Quilis, and J. Gorgas ISBN 978-84-695-7614-4 Sociedad Espa\~nola de Astronom\'ia, http://www.sea-astronomia.es/drupal/sites/default/files/archivos/proceedings10/fisica_solar/ORALES/palaciosj.pdf
A Flexible Security Analytics Service for the Industrial IoT
Creators: name: Empl, Philip
name: Pernul, Günther
Publisher: name: Universität Regensburg
Year: 2021
Subjects: subject: Industrial IoT, Security as a Service, Security Analytics
subject: 004 Informatik
subject: 10002978.10002991 Security and privacy~Security services 500 1

description: In Cloud Computing, the cloud serves as a central data hub for the Industrial Internet of Things' (IIoT) data and is deployed in diverse application fields, e.g., Smart Grid or Smart Manufacturing. Therefore, the aggregated and contextualized data is bundled in a central data hub, bringing tremendous cybersecurity advantages. Given the threat landscape in IIoT systems, especially SMEs (small and medium-sized enterprises) need to be prepared regarding their cybersecurity, react quickly, and strengthen their overall cybersecurity. For instance, with the application of machine learning algorithms, security-related data can be analyzed predictively in order to be able to ward off a potential attack at an early stage. Since modern reference architectures for IIoT systems, such as RAMI 4.0 or IIRA, consider cybersecurity approaches on a high level and SMEs lack financial funds and knowledge, this paper conceptualizes a security analytics service used as a security add-on to these reference architectures. Thus, this paper conceptualizes a flexible security analytics service that implements security capabilities with flexible analytical techniques that fit specific SMEs' needs. The security analytics service is also evaluated with a real-world use case.
Properties of the lunar exosphere during the perseid 2009 meteor shower
Creators: name: Berezhnoy, A. A.
name: Churyumov, K. I.
name: Kleshchenok, V. V.
name: Kozlova, E. A.
name: Mangano, V.
name: Pakhomov, Yu. V.
name: Ponomarenko, V. O.
name: Shevchenko, V. V.
name: Velikodsky, Yu. I.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Influence of the meteoroid bombardment on properties of the lunar exosphere has been confirmed. Quick increase in the zenith column density of Na atoms above the lunar north pole on August 13, 2009 at 0-1 UT is detected and explained by numerous collisions of relatively small Perseid meteoroids (< 1 kg) with the Moon during maximum of the Perseid meteor shower. New stringent upper limits of the column densities for Ca, Ba, and Ti atoms in the lunar exosphere are obtained as 5*10^7, 2.2*10^6, and 6.9*10^8 cm^-2, respectively. It is found that the content of impact-produced Ca and Al atoms in the lunar exosphere is depleted as compared to that of Na atoms.
description: 11 pages, 4 figures, 3 tables; accepted in Planetary and Space Science
Kinematic Properties of Slow ICMEs and an Interpretation of a Modified Drag Equation for Fast and Moderate ICMEs
Creators: name: Iju, T.
name: Tokumaru, M.
name: Fujiki, K.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Space Physics (physics.space-ph)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We report kinematic properties of slow interplanetary coronal mass ejections (ICMEs) identified by SOHO/LASCO, interplanetary scintillation, and in-situ observations, and propose a modified equation for the ICME motion. We identify seven ICMEs between 2010 and 2011, and examine them with 39 events reported in our previous work. We examine 15 fast (V_SOHO - V_bg > 500 km/s), 25 moderate (0 km/s <= V_SOHO - V_bg <= 500 km/s), and 6 slow (V_SOHO - V_bg < 0 km/s) ICMEs, where V_SOHO and V_bg are the initial speed of ICMEs and the speed of the background solar wind, respectively. For slow ICMEs, we found the following results: i) They accelerate toward the speed of the background solar wind during their propagation, and reach their final speed by 0.34 (+-) 0.03 AU. ii) The acceleration ends when they reach 479 (+-) 126 km/s; this is close to the typical speed of the solar wind during the period of this study. iii) When k_1 and k_2 are assumed to be constants, a quadratic equation for the acceleration a = -k_2(V - V_bg)|V - V_bg| is more appropriate than a linear one a = -k_1(V - V_bg), where V is the propagation speed of ICMEs, while the latter gives a smaller chi-square value than the former. For the motion of the fast and moderate ICMEs, we found a modified drag equation. From the viewpoint of fluid dynamics, we interpret this equation as indicating that ICMEs with 0 km/s <= V - V_bg <= 2300 km/s are controlled mainly by the hydrodynamic Stokes drag force, while the aerodynamic drag force is a predominant factor for the propagation of ICME with V - V_bg > 2300 km/s.
description: 24 pages, 6 figures, 10 tables, accepted for publication in Solar Physics
Device and semi-device independent random numbers based on non-inequality paradox
Creators: name: Li, Hong-Wei
name: Pawlowski, Marcin
name: Rahaman, Ramij
name: Guo, Guang-Can
name: Han, Zheng-Fu
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this work, we propose device independent true random numbers generation protocols based on non-inequality paradoxes such as Hardy's and Cabello's non-locality argument. The efficiency of generating randomness in our protocols are far better than any other proposed protocols certified by CHSH inequality or other non-locality test involving inequalities. Thus, highlighting non-inequality paradox as an important resource for device independent quantum information processing in particular generating true randomness. As a byproduct, we find that the non-local bound of the Cabello's argument with arbitrary dimension is the same as the one achieved in the qubits system. More interestingly, we propose a new dimension witness paradox based on the Cabello's argument, which can be used for constructing semi-device-independent true random numbers generation protocol.
BETON MIX 07 QO'SHIMCHASINING OG'IR BETON MUSTAHKAMLIGIGA TA'SIRI
Creators: name: Shodmonov, Anorqul
Publisher: name: Zenodo
Year: 2023

description: Beton va temir-beton mahsulotlari ishlab chiqarishni rivojlantirish uchun qurilish ishlarini samaradorligi va sifati bo'yicha talablar qo'yiladi. Bularni muvaffaqiyatli ravishda amalga oshirish uchun, asosan material va konstruktsiyalar ishlab chiqarishni rivojlantirish, sermetall, qurilish qiymati va sermehnatliligini, bino va inshootlarni og'irligini pasaytirishni ta'minlovchi hamda ularni qurilish va 4 еkspluatatsiya qilishdagi jami еnergetik mablag'lar sarfini kamaytirishga еrishish kerak. Bunday vazifalarni hal еtishda asosiy qurilish materiali hisoblangan beton va temir-betonga katta ahamiyat beriladi
Variability in Ultra-luminous X-ray Sources
Creators: name: Webb, Natalie
name: Cseh, David
name: Kirsten, Franz
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Many upcoming surveys, particularly in the radio and optical domains, are designed to probe either the temporal and/or the spatial variability of a range of astronomical objects. In the light of these high resolution surveys, we review the subject of ultra-luminous X-ray (ULX) sources, which are thought to be accreting black holes for the most part. We also discuss the sub-class of ULXs known as the hyper-luminous X-ray sources, which may be accreting intermediate mass black holes. We focus on some of the open questions that will be addressed with the new facilities, such as the mass of the black hole in ULXs, their temporal variability and the nature of the state changes, their surrounding nebulae and the nature of the region in which ULXs reside.
description: 9 pages, 1 figure, accepted for publication in PASA
Q and Q-prime curvature in CR geometry
Creators: name: Hirachi, Kengo
Publisher: name: arXiv
Year: 2014
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 32V05, 32T15

description: The Q-curvature has been playing a central role in conformal geometry since its discovery by T. Branson. It has natural analogy in CR geometry, however, the CR Q-curvature vanishes on the boundary of a strictly pseudoconvex domain in C^{n+1} with a natural choice of contact form. This fact enables us to define a "secondary" Q-curvature, which we call Q-prime curvature (it was first introduced by J. Case and P. Yang in the case n=1). The integral of the Q-prime curvature, the total Q-prime curvature, is a CR invariant of the boundary. When n=1, it agrees with the Burns-Epstein invariant, which is a Chern-Simons type invariant in CR geometry. For all n>=1, it has non-trivial variation under the deformation of domains. Combining the variational formula with the deformation complex of CR structures, we show that the total Q-prime curvature takes local maximum at the standard CR sphere in a formal sense.
description: 19 pages, to appear in the Proceedings of the ICM, Seoul 2014
Asymptotic safety on the lattice: The Nonlinear O(N) Sigma Model
Creators: name: Wellegehausen, Björn H.
name: Körner, Daniel
name: Wipf, Andreas
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the non-perturbative renormalization group flow of the nonlinear O(N) sigma model in two and three spacetime dimensions using a scheme that combines an effective local Hybrid Monte Carlo update routine, blockspin transformations and a Monte Carlo demon method. In two dimensions our results verify perturbative renormalizability. In three dimensions, we determine the flow diagram of the theory for various $N$ and different truncations and find a non-trivial fixed point, which indicates non-perturbative renormalizability. It is related to the well-studied phase transition of the O(N) universality class and characterizes the continuum physics of the model. We compare the obtained renormalization group flows with recent investigations by means of the Functional Renormalization Group.
description: 16 pages, 20 figures
An Approach: Modality Reduction and Face-Sketch Recognition
Creators: name: Pramanik, Sourav
name: Bhattacharjee, Dr. Debotosh
Publisher: name: arXiv
Year: 2013
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: To recognize face sketch through face photo database is a challenging task for todays researchers. Because face photo images in training set and face sketch images in testing set have different modality. Difference between two face photos of difference person is smaller than the difference between same person in a face photo and face sketched. In this paper, for reduction of the modality between face photo and face sketch we first bring face photo and face sketch images in a new dimension using 2D Discrete Haar wavelet transform with scale 3 followed by a negative approach. After that, extract features from transformed images using Principal Component Analysis (PCA). Thereafter, we use SVM classifier and K-NN classifier for better classification. Our proposed method is experimentally verified by its robustness against faces that are captured in a good lighting condition and in a frontal pose. The experiment has been conducted with 100 male and female face images as training set and 100 male and female face sketch images as testing set collected from CUHK training and testing cropped photos and CUHK training and testing cropped sketches.
description: 7 pages. arXiv admin note: substantial text overlap with arXiv:1312.1462
2p-Commutator on differential operators of order p
Creators: name: Dzhumadil'daev, Askar
Publisher: name: arXiv
Year: 2014
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics

description: We show that a space of one variable differential operators of order $p$ admits non-trivial $2p$-commutator and the number $2p$ here can not be improved.
description: 16 pages
OI Fluorescent Line Contamination in Soft X-Ray Diffuse Background Obtained with Suzaku/XIS
Creators: name: Sekiya, Norio
name: Yamasaki, Noriko Y.
name: Mitsuda, Kazuhisa
name: Takei, Yoh
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The quantitative measurement of OVII line intensity is a powerful method for understanding the soft X-ray diffuse background. By systematically analyzing the OVII line intensity in 145 high-latitude Suzaku/XIS observations, the flux of OI fluorescent line in the XIS spectrum, contaminating the OVII line, is found to have an increasing trend with time especially after 2011. For these observations, the OVII line intensity would be overestimated unless taking into consideration the OI fluorescent line contamination. Since the OI line emission originates from solar X-rays, this increase suggests that incident solar X-rays at the OI fluorescence energy tend to be larger than the early phase of Suzaku observations (2005 - 2010).
description: 10 pages, 4 figures, accepted for publication in PASJ Letters
APPLICATION AND EFFECTIVENESS OF WATER-SAVING TECHNOLOGIES
Creators: name: Nasibov, B.R.
name: Nazarov, X
Publisher: name: Zenodo
Year: 2023

description: The article effectively highlights the real importance of water-saving technologies. This highlights their potential to optimize water allocation, reduce wastage and increase productivity in agriculture. In the industrial sector, the introduction of water treatment and reclamation processes, water-saving equipment and practices appear as a means of reducing reliance on fresh water sources and minimizing the impact on the environment. In addition, discussions of household-scale water-saving appliances, low-flow fixtures, and gray water recycling systems provide practical insights for households seeking to reduce water use and lower utility costs.
Oscillations in Spurious States of the Associative Memory Model with Synaptic Depression
Creators: name: Murata, Shin
name: Otsubo, Yosuke
name: Nagata, Kenji
name: Okada, Masato
Publisher: name: arXiv
Year: 2014
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: The associative memory model is a typical neural network model, which can store discretely distributed fixed-point attractors as memory patterns. When the network stores the memory patterns extensively, however, the model has other attractors besides the memory patterns. These attractors are called spurious memories. Both spurious states and memory states are equilibrium, so there is little difference between their dynamics. Recent physiological experiments have shown that short-term dynamic synapse called synaptic depression decreases its transmission efficacy to postsynaptic neurons according to the activities of presynaptic neurons. Previous studies have shown that synaptic depression induces oscillation in the network and decreases the storage capacity at finite temperature. How synaptic depression affects spurious states, however, is still unclear. We investigate the effect of synaptic depression on spurious states through Monte Carlo simulation. The results demonstrate that synaptic depression does not affect the memory states but mainly destabilizes the spurious states and induces the periodic oscillations.
description: 17 pages, 9 figures
Locally Rotationally Symmetric Vacuum Solutions in f(R) Gravity
Creators: name: Amir, M. Jamil
name: Sattar, Sadia
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: This paper is devoted to find the Locally Rotationally Symmetric (LRS) vacuum solutions in the context of f(R) theory of gravity. Actually, we have considered the three metrics representing the whole family of LRS spacetimes and solved the field equations by using metric approach as well as the assumption of constant scalar curvature. It is mention here that R may be zero or non-zero. In all we found 10 different solutions.
description: 22 pages, Accepted for publication in Int. J. Theor. Phys
Vector and fermion fields on a bouncing brane with a decreasing warp factor in a string-like defect
Creators: name: Sousa, L. J. S.
name: Silva, C. A. S.
name: Dantas, D. M.
name: Almeida, C. A. S.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In a recent work, a model has been proposed where a brane is made of a scalar field with bounce-type configurations and embedded in a bulk with a string-like metric. This model produces an AdS scenario where the components of the energy momentum tensor are finite and have its positivity ensured by a suitable choice of the bounce configurations. In the present work, we study the issue of gauge and fermion field localization in this scenario. In contrast with the five dimensional case here the gauge field is localized without the dilaton contribution. Nevertheless, it is remarkable that the localization of the fermion field depends on the introduction of a minimal coupling with the angular component of the gauge field, which differs clearly from five dimensional scenarios. Furthermore, we perform a qualitative analysis of the fermionic massive modes and conclude that only left handed fermions could be localized in the brane.
description: 15 pages, 5 figures. To appear in Physics Letters B. arXiv admin note: text overlap with arXiv:1209.6016
Quantization, Holography and the Universal Coefficient Theorem
Creators: name: Patrascu, Andrei T.
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Physics (physics.gen-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: I present a method of performing geometric quantization using cohomology groups extended via coefficient groups of different types. This is possible according to the Universal Coefficient Theorem (UTC). I also show that by using this method new features of quantum field theory not visible in the previous treatments emerge. The main observation is that the ideas leading to the holographic principle can be interpreted in the context of the universal coefficient theorem from a totally different perspective.
description: 5 Pages. Pertinent comments are welcome
Lindblad equation for the decay of entanglement due to atmospheric scintillation
Creators: name: Roux, Filippus S.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The quantum state for the spatial degrees of freedom of photons propagating through turbulence is analyzed. The turbulent medium is modeled by a single phase screen for weak scintillation conditions and by multiple phase screens for general scintillation conditions. In the former case the process is represented by an operator product expansion, leading to an integral expression that is consistent with current models. In the latter case the evolution of the density operator is described by a first order differential equation with respect to the propagation distance. It is shown that this differential equation has the form of a Lindblad master equation. Additionally, it is shown that this differential equation can take on the form of the infinitesimal propagation equation.
description: 17 pages, 1 figure. Accepted for publication in J. Phys. A
The Very Bright and Nearby GRB 130427A: The Extra Hard Spectral Component and Implications for Very High-energy Gamma-ray Observations of Gamma-ray Bursts
Creators: name: Tam, Pak-Hin Thomas
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The extended high-energy gamma-ray (>100 MeV) emission occurring after the prompt gamma-ray bursts (GRBs) is usually characterized by a single power-law spectrum, which has been explained as the afterglow synchrotron radiation. We report on the Fermi Large Area Telescope (LAT) observations of the >100 MeV emission from the very bright and nearby GRB 130427A, up to ~100 GeV. By performing time-resolved spectral fits of GRB 130427A, we found a strong evidence of an extra hard spectral component above a few GeV that exists in the extended high-energy emission of this GRB. This extra spectral component may represent the first clear evidence of the long sought-after afterglow inverse Compton emission. Prospects for observations at the very high-energy gamma-rays, i.e., above 100 GeV, are described.
description: 6 pages, 2 figures, presented at the 4th High Energy Phenomena in Relativistic Outflows (HEPRO IV) meeting held in Heidelberg, July 23-26, 2013; to be published in IJMPCS
Face Recognition using Hough Peaks extracted from the significant blocks of the Gradient Image
Creators: name: Kar, Arindam
name: Bhattacharjee, Debotosh
name: Basu, Dipak Kumar
name: Nasipuri, Mita
name: Kundu, Mahantapas
Publisher: name: arXiv
Year: 2013
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: This paper proposes a new technique for automatic face recognition using integrated peaks of the Hough transformed significant blocks of the binary gradient image. In this approach firstly the gradient of an image is calculated and a threshold is set to obtain a binary gradient image, which is less sensitive to noise and illumination changes. Secondly, significant blocks are extracted from the absolute gradient image, to extract pertinent information with the idea of dimension reduction. Finally the best fitted Hough peaks are extracted from the Hough transformed significant blocks for efficient face recognition. Then these Hough peaks are concatenated together, which are used as feature in classification process. The efficiency of the proposed method is demonstrated by the experiment on 1100 images from the FRAV2D face database, 2200 images from the FERET database, where the images vary in pose, expression, illumination and scale and 400 images from the ORL face database, where the images slightly vary in pose. Our method has shown 93.3%, 88.5% and 99% recognition accuracy for the FRAV2D, FERET and the ORL database respectively.
description: 6 pages. arXiv admin note: substantial text overlap with arXiv:1312.1512
A 4-vector formalism for classical mechanics
Creators: name: Güémez, Julio
name: Fiolhais, Manuel
Publisher: name: arXiv
Year: 2014
Subjects: subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: We present a matrix formalism, inspired by the Minkowski four-vectors of special relativity, useful to solve classical physics problems related to both mechanics and thermodynamics. The formalism turns out to be convenient to deal with exercises involving non-conservative forces and production or destruction of mechanical energy. On the other hand, it provides a framework to treat straightforwardly changes of inertial reference frames, since it embodies the Principle of Relativity. We apply the formalism to a few cases to better show how it works.
description: 23 pages, 2 figures