cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Periodic class II methanol masers in G9.62+0.20E
Creators: name: van der Walt, D. J.
name: Goedhart, S.
name: Gaylard, M. J.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the light curves of the 6.7 and 12.2 GHz methanol masers in the star forming region G9.62+0.20E for a time span of more than 2600 days. The earlier reported period of 244 days is confirmed. The results of monitoring the 107 GHz methanol maser for two flares are also presented. The results show that flaring occurs in all three masing transitions. It is shown that the average flare profiles of the three masing transitions are similar. The 12.2 GHz masers are the most variable of the three masers with the largest relative amplitude having a value of 2.4. The flux densities for the different masing transitions are found to return to the same level during the low phase of the masers, suggesting that the source of the periodic flaring is situated outside the masing region, and that the physical conditions in the masing region are relatively stable. On the basis of the shape of the light curve we excluded stellar pulsations as the underlying mechanism for the periodicity. It is argued that a colliding wind binary can account for the observed periodicity and provide a mechanism to qualitatively explain periodicity in the seed photon flux and/or the pumping radiation field. It is also argued that the dust cooling time is too short to explain the decay time of about 100 days of the maser flare. A further analysis has shown that for the intervals from days 48 to 66 and from days 67 to 135 the decay of the maser light curve can be interpreted as due to the recombination of a thermal hydrogen plasma with densities of approximately $1.6 \times 10^6 \mathrm{cm^{-3}}$ and $6.0 \times 10^5 \mathrm{cm^{-3}}$ respectively.
description: 11 pages, 9 figuers
The complete spectrum of the neutron star X-ray binary 4U0614+091
Creators: name: Migliari, S.
name: Tomsick, J. A.
name: Miller-Jones, J. C. A.
name: Heinz, S.
name: Hynes, R. I.
name: Fender, R. P.
name: Gallo, E.
name: Jonker, P. G.
name: Maccarone, T. J.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We observed the neutron star (NS) ultra-compact X-ray binary 4U0614+091 quasi-simultaneously in the radio band (VLA), mid-IR/IR (Spitzer/MIPS and IRAC), near-IR/optical (SMARTS), optical-UV (Swift/UVOT), soft and hard X-rays (Swift/XRT and RXTE). The source was steadily in its `hard state'. We detected the source in the whole range, for the first time in the radio band at 4.86 and 8.46 GHz and in the mid-IR at 24 um, up to 100 keV. The optically thick synchrotron spectrum of the jet is consistent with being flat from the radio to the mid-IR band. The flat jet spectrum breaks in the range (1-4)x10^(13) Hz to an optically-thin power-law synchrotron spectrum with spectral index ~-0.5. These observations allow us to estimate a lower limit on the jet radiative power of ~3x10^(32) erg/s and a total jet power Lj~10^(34) u_(0.05)^(-1) Ec^(0.53) erg/s (where Ec is the high-energy cutoff of the synchrotron spectrum in eV and u_(0.05) is the radiative efficiency in units of 0.05). The contemporaneous detection of the optically thin part of the compact jet and the X-ray tail above 30 keV allows us to assess the contribution of the jet to the hard X-ray tail by synchrotron self-Compton (SSC) processes. We conclude that, for realistic jet size, boosting, viewing angle and energy partition, the SSC emission alone, from the post-shock, accelerated, non-thermal population in the jet, is not a viable mechanism to explain the observed hard X-ray tail of the neutron star 4U0614+091.
description: accepted for publication in ApJ
PayPal in Romania
Creators: name: Pintea, Florentina Anica
name: Fintineanu, Georgiana Petruta
name: Selariu, Bogdan Ioan
Publisher: name: arXiv
Year: 2009
Subjects: subject: Other Computer Science (cs.OH)
subject: FOS: Computer and information sciences

description: The present paper refers to the usefulness of online payment through PayPal and to the development of this payment manner in Romania. PayPal is an example of a payment intermediary service that facilitates worldwide e-commerce.
description: 8 pages, exposed on 5th International Conference "Actualities and Perspectives on Hardware and Software" - APHS2009, Timisoara, Romania
Jet substructure at HERA
Creators: name: Glasman, Claudia
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A review is presented of jet substructure measurements from the H1 and ZEUS Collaborations at HERA. The results presented include tests of perturbative QCD, comparison of the properties of quark and gluon jets, the comparison of the pattern of QCD radiation in different hard scattering processes, determination of the strong coupling and studies of the underlying subprocesses dynamics and of the pattern of parton radiation.
description: 10 pages, 21 figures, talk given in "Ringberg Workshop: New Trends in HERA Physics 2008", Ringberg Castle, Tegernsee, Germany, October 2008
Transport Anomalies of the Strange Metal: Resolution by Hidden Fermi Liquid Theory
Creators: name: Anderson, Philip W
name: Casey, Philip A
Publisher: name: arXiv
Year: 2009
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The strange metal phase of optimally and overdoped cuprates exhibits a number of anomalous transport properties: unsaturating linear T resistivity, distinct relaxation times for Hall angle and resistivity, temperature dependent anisotropic relaxation times, and a characteristic crossover from supposed Fermi Liquid to linear T behavior. All receive natural explanations and quantitative fits in terms of the Hidden Fermi Liquid theory.
Couplers for Non-Locality Swapping
Creators: name: Skrzypczyk, Paul
name: Brunner, Nicolas
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Studying generalized non-local theories brings insight to the foundations of quantum mechanics. Here we focus on non-locality swapping, the analogue of quantum entanglement swapping. In order to implement such a protocol, one needs a coupler that performs the equivalent of quantum joint measurements on generalized `box-like' states. Establishing a connection to Bell inequalities, we define consistent couplers for theories containing an arbitrary amount of non-locality, which leads us to introduce the concepts of perfect and minimal couplers. Remarkably, Tsirelson's bound for quantum non-locality naturally appears in our study.
description: 16 pages, 3 figures
Current-driven vortex oscillations in metallic nanocontacts: Zero-field oscillations and training effects
Creators: name: van Kampen, M.
name: Lagae, L.
name: Hrkac, G.
name: Schrefl, T.
name: Kim, Joo-Von
name: Devolder, T.
name: Chappert, C.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present an experimental and theoretical study of the low-field dynamics of current-driven vortex oscillations in nanocontacts based on spin-valve multilayers. These oscillations appear as low-frequency (250-500 MHz) excitations in the electrical power spectrum which arise from to variations in the giant-magnetoresistance. We show that the vortex oscillations, once nucleated at large fields applied perpendicular to the film plane, persist at zero applied magnetic fields. Some training effects on the oscillation frequency and linewidth also observed for small in-plane magnetic fields.
description: 6 pages, 7 figures
On Column-restricted and Priority Covering Integer Programs
Creators: name: Chakrabarty, Deeparnab
name: Grant, Elyot
name: Koenemann, Jochen
Publisher: name: arXiv
Year: 2010
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences

description: In a column-restricted covering integer program (CCIP), all the non-zero entries of any column of the constraint matrix are equal. Such programs capture capacitated versions of covering problems. In this paper, we study the approximability of CCIPs, in particular, their relation to the integrality gaps of the underlying 0,1-CIP. If the underlying 0,1-CIP has an integrality gap O(gamma), and assuming that the integrality gap of the priority version of the 0,1-CIP is O(omega), we give a factor O(gamma + omega) approximation algorithm for the CCIP. Priority versions of 0,1-CIPs (PCIPs) naturally capture quality of service type constraints in a covering problem. We investigate priority versions of the line (PLC) and the (rooted) tree cover (PTC) problems. Apart from being natural objects to study, these problems fall in a class of fundamental geometric covering problems. We bound the integrality of certain classes of this PCIP by a constant. Algorithmically, we give a polytime exact algorithm for PLC, show that the PTC problem is APX-hard, and give a factor 2-approximation algorithm for it.
description: 28 pages, 6 figures, extended abstract to appear in proceedings of IPCO 2010.
Observing alternatives to inflation
Creators: name: Peter, P.
Publisher: name: arXiv
Year: 2009
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We discuss the possibility that the inflationary paradigm, undoubtfully today's best framework to understand all the present cosmological data, may still have some viable challengers. The underlying idea for such discussions is that although inflation already passed quite a large number of tests, indeed enough to make it part of the so-called ``standard model'' of cosmology, it has always been through indirect measurements: there is not a chance that we may ever directly check its validity, and therefore, in order to assert its factuality with increasing level of confidence, it is required that we compare its predictions not only to observations, but also to as many contenders as possible. Among other categories of possible models, we wish to put the emphasis in particular on bouncing cosmologies that, however not as complete as the inflation paradigm might be, could still represent a reasonnable way of explaining the current data. Hopefully, future data will be able to discriminate between these various sets of theories.
description: 12 pages, no figure, proceedings "Workshop on Cosmic Structure and Evolution" - Sept. 2009, Bielefeld, Germany
Hysteresis in the T=0 RFIM: beyond metastable dynamics
Creators: name: Salvat-Pujol, F.
name: Vives, E.
name: Rosinberg, M. L.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We present a numerical study of the zero-temperature response of the Gaussian random-field Ising model (RFIM) to a slowly varying external field, allowing the system to be trapped in microscopic configurations that are not fully metastable. This modification of the standard single-spin-flip dynamics results in an increase of dissipation (hysteresis) somewhat similar to that observed with a finite driving rate. We then study the distribution of avalanches along the hysteresis loop and perform a finite-size scaling analysis that shows good evidence that the critical exponents associated to the disorder-induced phase transition are not modified.
description: 8 pages, 11 figures
A reconfigurable-intelligent-surface unit cell with tunable phase and phase-frequency slope for wide-band OFDM systems
Creators: name: Abbas, Omran
Publisher: name: University of British Columbia
Year: 2025

description: The reflection characteristics of reconfigurable intelligent surfaces (RIS) depend on the phase response of the constituent unit cells, which is necessarily frequency-dependent. This work investigates two topics: the role of RIS unit cells with different phase-frequency profiles in a wide-band orthogonal frequency division multiplexing (OFDM) system to improve the achievable rate, and the implementation of a unit cell with independent control over the slopes and phase of the phase-frequency profile. First, we propose a mathematical model for the phase-frequency relationship of a realizable resonant RIS unit cell parameterized by the resonance frequency and resonant phase slope. Then, modelling each RIS element with b control bits, we propose an algorithm for selecting the parameter pairs to obtain a set of 2ᵇ phase-frequency profiles. The proposed method yields an RIS design that outperforms existing designs over a wide range of user locations in a single-input, single-output (SISO) OFDM system. We then propose a low-complexity optimization algorithm to maximize the data rate that is comprised of the joint optimization of (a) power allocations across the sub-carriers and (b) the phase-frequency profiles for each RIS unit cell from the available set. We then study a multi-user multiple-input single-output (MISO) OFDM scenario and show an improvement of (90%) in the coverage and achievable rates under the proposed framework as compared to single-slope phase-frequency profiles. Secondly, we design an electrically tunable linearly polarized array at 2.5 GHz that yields low reflection losses and simultaneously controllable reflection phase and phase-frequency slope. The proposed design consists of three layers of unit cells with dog-bone-shaped elements in the top layer and patch elements in the bottom layer that are placed over a ground plane. Each patch and dog-bone element is loaded with a Varactor, whose reverse bias voltage is controlled to provide a phase-frequency profile with a continuous slope. Simulation results show slope values between 10 degrees/MHz and 1 degrees/MHz, with a range of 340 degrees phase shift for each slope at 2.5 GHz. The experimental measurements obtained using a prototype comprised of 16 unit cells showed continuous slope values between 12 degrees/MHz and 1.25 degrees/MHz, with a phase shift range of 300 degrees at 2.4 GHz.
Agama colonorum var. impalearis Böttg.
Creators: name: Müller, F
Publisher: name: Zenodo
Year: 1885
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Squamata
Sauria
Agamidae
Agama
Agama colonorum
Var. impalearis böttg.

description: ? id. var. impalearis Böttg.
Tumbo-Insel v. H. Mich. Müller. [1]
♂ mit hellrothbraunem Kopf und Nacken und ziegelrother Kehle und Kehlwamme; Rücken braun mit verwischten weisslichen Queerstreifen; ♀ grünlich-oliv mit dunkelm Netzwerk. Auﬂallend ist bei letzterm eine leichte Kieluııg vieler Bauchschuppen, besonders nach hinten.
description: Published as part of Müller, F, 1885, Vierter Nachtrag zum Katalogder herpetologischen Sammlung des Basler Museums, pp. 668-717 in Verhandlungen der Naturforschenden Gesellschaft in Basel. 7 (3) on page 713, DOI: 10.5962/bhl.part.2388, http://zenodo.org/record/15183591
Evolution equations of the truncated moments of the parton densities. A possible application
Creators: name: Kotlorz, Dorota
name: Kotlorz, Andrzej
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: A possible application of the evolution equation for the truncated Mellin moments to determination of the parton distributions in the nucleon is presented. We find that the reconstruction of the initial parton densities at scale $Q_0^2$ from their truncated moments at a given scale $Q^2$ is exact and unique for small number of free parameters ($\leq 3$), even for the limited $x$-region of experimental data. For larger number of adjustable parameters the obtained fits are not unique and one needs an additional knowledge of the small-$x$ behaviour of the parton densities to make the reconstruction procedure reliable. We apply successfully our method to HERMES and COMPASS spin-dependent valence quark data.
description: 6 pages, 5 figures
A new Contrast Based Image Fusion using Wavelet Packets
Creators: name: Balasubramanian, R.
name: Bhatnagar, Gaurav
Publisher: name: arXiv
Year: 2008
Subjects: subject: Information Theory (cs.IT)
subject: Multimedia (cs.MM)
subject: FOS: Computer and information sciences

description: Image Fusion, a technique which combines complimentary information from different images of the same scene so that the fused image is more suitable for segmentation, feature extraction, object recognition and Human Visual System. In this paper, a simple yet efficient algorithm is presented based on contrast using wavelet packet decomposition. First, all the source images are decomposed into low and high frequency sub-bands and then fusion of high frequency sub-bands is done by the means of Directive Contrast. Now, inverse wavelet packet transform is performed to reconstruct the fused image. The performance of the algorithm is carried out by the comparison made between proposed and existing algorithm.
description: 5 Pages, 10 Figures, 1 Table
Is the X(3872) Production Cross Section at Tevatron Compatible with a Hadron Molecule Interpretation?
Creators: name: Bignamini, C
name: Grinstein, B
name: Piccinini, F
name: Polosa, AD
name: Sabelli, C
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The X(3872) is universally accepted to be an exotic hadron. In this letter we assume that the X(3872) is a D0 \bar D0* molecule, as claimed by many authors, and attempt an estimate of its prompt production cross section at Tevatron. A comparison with CDF data allows to draw some qualitative conclusions about this statement.
description: 4 pages, 4 figures, accepted for publication in Phys. Rev. Lett
Comment on "Dynamic properties in a family of competitive growing models"
Creators: name: Kolakowska, A.
name: Novotny, M. A.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The article [Phys. Rev. E {\bf 73}, 031111 (2006)] by Horowitz and Albano reports on simulations of competitive surface-growth models RD+X that combine random deposition (RD) with another deposition X that occurs with probability $p$. The claim is made that at saturation the surface width $w(p)$ obeys a power-law scaling $w(p) \propto 1/p^δ$, where $δ$ is only either $δ=1/2$ or $δ=1$, which is illustrated by the models where X is ballistic deposition and where X is RD with surface relaxation. Another claim is that in the limit $p \to 0^+$, for any lattice size $L$, the time evolution of $w(t)$ generally obeys the scaling $w(p,t) \propto (L^α/p^δ) F(p^{2δ}t/L^z)$, where $F$ is Family-Vicsek universal scaling function. We show that these claims are incorrect.
description: 2 pages, 3 figures, accepted for publication in Physical Review E in Aug. 2009
title: Биотехнология пищевых продуктов
Creators: name: ELS IPR BOOKS
Publisher: name: Самарский государственный технический университет, ЭБС АСВ
Year: 2022

description: Составлено в соответствии с программой дисциплины «Пищевая биотехнология» и предназначено для студентов, обучающихся по направлению 240700-62 «Биотехнология» очной и заочной форм обучения. Даны основные термины и определения в области биотехнологии, описаны процессы получения полезных веществ с помощью микроорганизмов. Более подробно рассмотрены вопросы, касающиеся одной из наиболее перспективных и развивающихся отраслей, – пищевой биотехнологии.
Accurate calculations of the WIMP halo around the Sun and prospects for gamma ray detection
Creators: name: Sivertsson, Sofia
name: Edsjö, Joakim
Publisher: name: arXiv
Year: 2009
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Weakly interacting massive particles (WIMPs) can be captured by heavenly objects, like the Sun. Under the process of being captured by the Sun, they will build up a population of WIMPs around it, that will eventually sink to the core of the Sun. It has been argued with simpler estimates before that this halo of WIMPs around the Sun could be a strong enough gamma ray source to be a detectable signature for WIMP dark matter. We here revisit the problem using detailed Monte Carlo simulations and detailed composition and structure information about the Sun to estimate the size of the gamma ray flux. Compared to earlier estimates, we find that the gamma ray flux from WIMP annihilations in the Sun halo would be negligible and no current or planned detectors would even be able to detect this flux.
description: 5 pages, 1 figure. To appear in the proceedings of the Identification of Dark Matter conference (IDM 2008), Stockholm, Sweden, 18-22 August, 2008
Improving the performance of distributed antenna systems using multi-pair computation schemes
Creators: name: Hasabel Naby, Mahmoud
Publisher: name: University of British Columbia
Year: 2024

description: The rapid evolution of wireless communication networks demands evolved radio access network (RAN) architectures that can support massive connectivity and deliver high data rates. Collaborative signal processing, as seen in distributed antenna systems (DAS), is a promising approach, demonstrated by paradigms like Cloud RAN (C-RAN), Fog RAN (F-RAN), Cell-Free Massive MIMO (CF-mMIMO), and Open RAN (O-RAN). However, the effectiveness of DAS networks is constrained by the limited capacity of fronthaul links, connecting distributed antenna terminals to the central processing unit (CPU). This calls for the development of advanced signal processing and relaying techniques for efficient utilization of fronthaul links in both uplink and downlink transmissions. This dissertation makes a significant contribution by introducing a novel end-to-end multi-pair two-way computation paradigm tailored for DAS. It advocates a joint design approach for uplink and downlink transmissions, taking into consideration the source-destination message information. This idea is demonstrated in this dissertation through a pairwise message exchange paradigm among communicating users in the DAS, emphasizing the optimization of end-to-end spectral and energy efficiency. A lattice-based computation approach is adopted, wherein each antenna terminal quantizes its observed signal and transmits it to the CPU. The CPU decodes integer linear combinations of paired users' codewords, rather than linear combinations of individual codewords. The computed signals are then beamformed, compressed, and forwarded to the distributed antenna terminals, which subsequently decompress and transmit them to the users. This approach is applied in various scenarios, including C-RAN with intra-cloud communications and combined intra and inter-cloud scenarios, assuming perfect channel state information (CSI) and considering both real and complex-valued channel models. To address sensitivity to CSI estimation errors, a robust end-to-end multi-pair computation scheme is proposed to optimize energy efficiency under imperfect CSI, particularly relevant in CF-mMIMO networks due to their 'massive' nature. Additionally, to further alleviate communication overhead over limited-capacity fronthaul links, a distributed multi-pair computation scheme is introduced, wherein the computation of certain user-pair codewords is to be offloaded from the CPU to the distributed antenna terminals. The effectiveness of these proposed frameworks is rigorously evaluated through theoretical derivations and numerical simulations, demonstrating their superiority over state-of-the-art schemes.
Supplement.pdf from Precipitation during two weeks in spring influences reproductive success of first-year females in the long-lived Natterer's bat
Creators: name: Stapelfeldt, Bianca
name: Scheuerlein, Alexander
name: Tress, Christoph
name: Koch, Ralf
name: Tress, Johannes
name: Kerth, Gerald
Publisher: name: The Royal Society
Year: 2022
Subjects: subject: Ecology
subject: FOS: Biological sciences

description: Bats are characterized by low reproductive rates in contrast with most of other small mammals. This makes their populations vulnerable when inclement environmental conditions such as cold and rainy weather impair the reproductive success of females. The fine-scale effect of weather on bats, however, remains largely unknown. Using a sliding window analysis approach on an 18-year individualized dataset on six Natterer's bat (Myotis nattereri) colonies, we investigated the effect of fine-scale weather conditions on age-specific reproductive success. We found that increased precipitation during a short time window in spring strongly reduced the probability of successful reproduction of first-year (FY) females. Our data suggest that this time window is concomitant with implantation or early pregnancy, before substantial investment into embryo development. In addition, larger FY had higher reproductive success, suggesting that reproduction may be condition dependent in young females. Reproductive success of older females was not affected by either weather or individual parameters. Our results show that changes in precipitation pattern may compromise the reproductive success of FY females. Further studies are needed to better understand the impact of weather conditions on reproductive success in long-lived bats under climate change scenarios.
title: Геополитика: история геополитических практик
Creators: name: ELS IPR BOOKS
Publisher: name: Самарский государственный технический университет, ЭБС АСВ
Year: 2021

description: Хрестоматия содержит тексты, раскрывающие военные, политические, экономические, географические, идеологические, юридические аспекты международных отношений Античной, Средневековой, Новой и Новейшей эпох. Хрестоматия предназначена для студентов специалитета и бакалавриата всех форм обучения.
title: Изучение конструкции и принципа работы металлорежущего оборудования
Creators: name: ELS IPR BOOKS
Publisher: name: Самарский государственный технический университет, ЭБС АСВ
Year: 2021

description: Рассмотрены основные технические характеристики, классификация и формообразующие движения металлорежущего оборудования, разобраны кинематические цепи основных движений. Проанализированы кинематические схемы фрезерного, сверлильного, зубодолбежного и хонинговального станков. Предназначено для обучающихся по направлению подготовки 15.03.05 «Конструкторско-технологическое обеспечение машиностроительных производств», 15.03.01 «Машиностроение».
Amtliche Mitteilungen der Technischen Universität Dortmund Nr. 12/2023
Creators: name: (:Unkn) Unknown
Publisher: name: Technische Universität Dortmund
Year: 2023
Subjects: subject: 080

description: Ordnung zur Regelung des Verfahrens zur Verhängung von Ordnungsmaßnahmen bei Ordnungsverstößen durch Studierende an der Technischen Universität Dortmund
description: Amtliche Mitteilungen der Technischen Universität Dortmund;2023; 12
Swift observations of IGRJ16479-4514 in outburst
Creators: name: Bozzo, E.
name: Giunta, A.
name: Stella, L.
name: Falanga, M.
name: Israel, G.
name: Campana, S.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The supergiant fast X-ray transient source IGR J16479-4514 was observed in outburst two times with Swift. Its quiescent state was investigated in-depth only once in 2008 through a relatively long pointed observation with XMM-Newton. The latter observation was taken about 1.7 days after the outburst in 2008, and showed an X-ray eclipse-like event, likely caused by the supergiant companion. At present, this is the only supergiant fast X-ray transient that displayed an evidence for an X-ray eclipse. Here we carry out a comparison between the most recent outburst of IGRJ16479-4514, caught by Swift on 29 January 2009 and those detected previously from this source. The decay from the outbursts in 2005, 2008 and 2009 presents many similarities, and suggests a common mechanism that modulates the mass accretion rate onto the neutron star in IGRJ16479-4514.
description: Accepted for publication in A&A
Hodge theory meets the minimal model program: a survey of log canonical and Du Bois singularities
Creators: name: Kovács, Sándor J
name: Schwede, Karl
Publisher: name: arXiv
Year: 2009
Subjects: subject: Algebraic Geometry (math.AG)
subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: 14B05

description: This is a survey of some recent developments in the study of singularities related to the classification theory of algebraic varieties. In particular, the definition and basic properties of Du Bois singularities and their connections to the more commonly known singularities of the minimal model program are reviewed and discussed.
description: 35 pages. To appear in the Proceedings of the MSRI Workshop on the Topology of Stratified Spaces
A variational principle for computing slow invariant manifolds in dissipative dynamical systems
Creators: name: Lebiedz, Dirk
name: Siehr, Jochen
name: Unger, Jonas
Publisher: name: arXiv
Year: 2009
Subjects: subject: Dynamical Systems (math.DS)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 37N40, 37M99, 80A30, 92E20

description: A key issue in dimension reduction of dissipative dynamical systems with spectral gaps is the identification of slow invariant manifolds. We present theoretical and numerical results for a variational approach to the problem of computing such manifolds for kinetic models using trajectory optimization. The corresponding objective functional reflects a variational principle that characterizes trajectories on, respectively near, slow invariant manifolds. For a two-dimensional linear system and a common nonlinear test problem we show analytically that the variational approach asymptotically identifies the exact slow invariant manifold in the limit of both an infinite time horizon of the variational problem with fixed spectral gap and infinite spectral gap with a fixed finite time horizon. Numerical results for the linear and nonlinear model problems as well as a more realistic higher-dimensional chemical reaction mechanism are presented.
description: 16 pages, 5 figures
Ein neuer Thiolat‐gebundener Dimangan‐Cluster als strukturelles und funktionales Modell der Class Ib Ribonukleotidreduktasen
Creators: name: Battistella, Beatrice
name: Lohmiller, Thomas
name: Cula, Beatrice
name: Hildebrandt, Peter
name: Kuhlmann, Uwe
name: Dau, Holger
name: Mebs, Stefan
name: Ray, Kallol
Publisher: name: Technische Universität Berlin
Year: 2023
Subjects: subject: 500 Naturwissenschaften und Mathematik::540 Chemie::540 Chemie und zugeordnete Wissenschaften
subject: cioanorganische Chemie
subject: Dimangan-Kofaktor
subject: Enzymmodell
subject: Phenoloxidation
subject: Ribonukleotidreduktase

description: In Class Ib Ribonukleotidreduktasen (RNRs) aktiviert ein Dimangan(II)-Cluster Superoxid (O2⋅−) anstelle von molekularem Sauerstoff (O2), um eine hochvalente MnIII-O2-MnIV-Spezies zu bilden, die für die Oxidation von Tyrosin zum Tyrosyl-Radikal verantwortlich ist. Im vorliegenden biomimetischen Ansatz wird ein Thiolat-gebundener Dimangan-Komplex [MnII2(BPMT)(OAc)2](ClO)4 (BPMT=(2,6-Bis{[bis(2-pyridylmethyl)amino]methyl}-4-methylthiophenolat) (1) synthetisiert und dessen Reaktion mit O2⋅− zur Bildung des [(BPMT)MnO2Mn]2+-Komplexes 2 gezeigt. Resonanz-Raman-Untersuchungen zeigen das Vorliegen einer O-O-Bindung in 2, während die ESR-Analyse ein Signal bei g=2 mit 16 Linien für St=urn:x-wiley:00448249:media:ange202217076:ange202217076-math-0001 aufzeigt, das typischerweise mit einem MnIIIMnIV-Kern assoziiert wird, wie es auch in Class Ib RNR detektiert wurde. Anders als zuvor publizierte Mn-O2-Mn-Komplexe, die durch O2⋅−-Aktivierung an Mn2-Zentren gebildet wurden, ist 2 ein geeignetes elektrophiles Oxidationsmittel für Aldehyd-Deformylierungsreaktionen und Phenol-Oxidationsreaktionen, sodass es eines der besten strukturellen und funktionalen Modelle der Class Ib RNRs darstellt.
title: Wittgenstein's world-picture
Creators: name: Pirmohammadi Pour, Hossein
Publisher: name: Memorial University of Newfoundland
Year: 2020

description: In this paper, I discuss the position and meaning of Wittgenstein’s notion of “world-picture” in comparison with the central doctrines of Tractatus—the “picture-theory of meaning”—and Philosophical Investigations—“language-game” and “form of life.” This notion appears in his book On Certainty, which he wrote in the last couple years of his life; it prompts a few questions concerning the degree to which Wittgenstein distances himself from his previous philosophical stands, leading to the very interpretation of the “third-Wittgenstein.” Early Wittgenstein is mostly engaged in picturing the logical structure of language and its relation to the world. Later Wittgenstein, with a revolutionary step, criticizes his old thoughts and proposes new ideas. The crucial question here is whether Wittgenstein’s attention to the epistemological debates in the last few years of his life is a new approach to his way of doing philosophy. We can study the notion of the world-picture concerning both strands. On the one hand, what we can find in Tractatus is sort of a metaphysical subject who is a limit of the world, whereas the world-picture discusses the beliefs of an empirical subject about the world—a subject who lives in the world. On the other hand, the world-picture preconditions the language-game presented in Philosophical Investigations. Before participating in any language-games or forms of life, a language user needs to have a worldview constituted of beliefs without reason. How I intend to develop this topic is by looking at Wittgenstein’s early and later philosophy to tackle this possible question: Does the notion of a world-picture necessitate the recognition of a “third Wittgenstein” in philosophy?
Phase transitions in self-dual generalizations of the Baxter-Wu model
Creators: name: Deng, Youjin
name: Guo, Wenan
name: Heringa, Jouke R.
name: Blöte, Henk W. J.
name: Nienhuis, Bernard
Publisher: name: arXiv
Year: 2009
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study two types of generalized Baxter-Wu models, by means of transfer-matrix and Monte Carlo techniques. The first generalization allows for different couplings in the up- and down triangles, and the second generalization is to a $q$-state spin model with three-spin interactions. Both generalizations lead to self-dual models, so that the probable locations of the phase transitions follow. Our numerical analysis confirms that phase transitions occur at the self-dual points. For both generalizations of the Baxter-Wu model, the phase transitions appear to be discontinuous.
description: 29 pages, 13 figures
The sharp Hardy Uncertainty Principle for Schödinger evolutions
Creators: name: Escauriaza, L.
name: Kenig, C. E.
name: Ponce, G.
name: Vega, L.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Analysis of PDEs (math.AP)
subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 35B05

description: We give a new proof of Hardy's uncertainty principle, up to the end-point case, which is only based on calculus. The method allows us to extend Hardy's uncertainty principle to Schrödinger equations with non-constant coefficients. We also deduce optimal Gaussian decay bounds for solutions to these Schrödinger equations.
title: История
Creators: name: ELS IPR BOOKS
Publisher: name: Самарский государственный технический университет, ЭБС АСВ
Year: 2021

description: Предназначено для студентов всех направлений и форм подготовки (бакалавриат, специалитет), изучающих дисциплины «История» и «История (история России, всеобщая история)». Отвечает государственным образовательным стандартам, содержит учебные материалы, контрольные вопросы и список литературы по всем темам курса.
title: Классификация технологических маршрутов изготовления разнофункциональных изделий из различных материалов
Creators: name: ELS IPR BOOKS
Publisher: name: Самарский государственный технический университет, ЭБС АСВ
Year: 2022

description: Рассмотрены вопросы, связанные с классификацией технологических маршрутов изготовления разнофункциональных изделий из различных материалов. Классификация осуществлена по следующим основным показателям: объем производства; точность изготовления изделий; материал изделий. Представлены примеры технологических маршрутов в условиях единичного и массового производств, изготовления прецизионных изделий, обработки неметаллических материалов. Предназначено для студентов, обучающимся по направлениям 15.03.05, 18.03.01, 22.03.01, 22.03,02 по дисциплинам «Материаловедение и технологии конструкционных материалов», «Материаловедение и технология конструкционных материалов», по направлениям 22.03.01, 22.03.02 по дисциплине «Основы производства и обработки металлов», а также для специалистов, работающих в различных отраслях машиностроения и металлообработки.
A Geometric Theory of Thermal Stresses
Creators: name: Ozakin, Arkadas
name: Yavari, Arash
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mathematical Physics (math-ph)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: In this paper we formulate a geometric theory of thermal stresses. Given a temperature distribution, we associate a Riemannian material manifold to the body, with a metric that explicitly depends on the temperature distribution. A change of temperature corresponds to a change of the material metric. In this sense, a temperature change is a concrete example of the so-called referential evolutions. We also make a concrete connection between our geometric point of view and the multiplicative decomposition of deformation gradient into thermal and elastic parts. We study the stress-free temperature distributions of the finite-deformation theory using curvature tensor of the material manifold. We find the zero-stress temperature distributions in nonlinear elasticity. Given an equilibrium configuration, we show that a change of the material manifold, i.e. a change of the material metric will change the equilibrium configuration. In the case of a temperature change, this means that given an equilibrium configuration for a given temperature distribution, a change of temperature will change the equilibrium configuration. We obtain the explicit form of the governing partial differential equations for this equilibrium change. We also show that geometric linearization of the present nonlinear theory leads to governing equations that are identical to those of the classical linear theory of thermal stresses.
Behavioural therapy training for Tourette Syndrome A Success story?
Creators: name: Anderson, Seonaid
name: Murphy, Tara
name: Griendt, Jolande Van De
name: Stern, Jeremy S.
Publisher: name: F1000 Research Limited
Year: 2019

description: Treatment shown to be effective for Tourette Syndrome (TS) includes medication and behavioural interventions. The European clinical guidelines for Tourette Syndrome suggest that behavioural therapies (BT) are ‘first line treatments for tics for both children and adults’. However a barrier to delivering this in the UK and elsewhere is a lack of access to specialised psychologists. To relieve this problem there has been successful work on BT delivered by telemedicine, group interventions and there are current projects using remote access and online treatments. Tourettes Action (TA) is a national charity in the UK which offers subsidised training in BT. The European Society for the Study of Tourette Syndrome (ESSTS) also runs training at the annual conference. TA hopes that the training it runs in the UK will increase the access of patients to BT in Britain. We aimed to estimate the numbers of therapists trained in BT both at ESSTS and by TA in the UK. We examined the number of people attending the BT training in the UK and whether this translates into additions to the TA list of available therapists which is for the UK only.
METALLURGICAL LENGTH PREDICTION IN CONTINUOUS CASTING
Creators: name: Al Manasir, Rashed Daoud
Publisher: name: Purdue University Graduate School
Year: 2023
Subjects: Mechanical engineering not elsewhere classified

description: Around 98% of the crude steel produced in the United States goes through the CC process, in which a water-cooled mold is used to solidify molten steel using water sprays to create semifinished slabs or billets. The quality of both the exterior and inside of the slab is directly related to the rate at which it is cooled, making secondary cooling a difficult process. The heat must be removed efficiently without causing the slab to crack or deform in any way. Low grade steel is produced because of inadequate spray cooling and solidification, which leads to flaws like cracking and breakout. Real-time online dynamic casting control systems are becoming increasingly popular in continuous casting as a means to increase yield and energy efficiency. These systems are built to reliably produce high-quality steel products via real-time temperature measurements and dynamic adjustment of the spray cooling rate. For real-time heat transfer and solidification calculations in the field, the key challenge is determining an accurate Heat Transfer Coefficient (HTC) for the steel product's surface. The correlations for predicting the spray cooling rate empirically have been developed with great care. Nevertheless, these correlations are only valid under specific application circumstances. Building it takes a significant amount of time and effort, and there is no assurance that the correlation will continue to accurately predict HTC even if the development process is modified in any way. An in-depth investigation into the heat transfer mechanisms that take place during the secondary cooling step of continuous steel casting is required in order to achieve control and optimization goals for this step. The non-optimized solidification process also contributes to the formation of inhomogeneous steel properties. The project required the application of computational fluid dynamics modeling techniques so that the casting process could be regulated and improved upon. Simulation of droplet formation, droplet transport, and impingement heat transfer during secondary cooling with an air-mist nozzle in a 3D computational fluid dynamics (CFD) model is going to be done in this study with the intention of generating a multivariable correlation that can accurately predict the lumped HTC under any casting condition. This will be accomplished by using the model. It modeled the solidification of the whole continuous caster by taking into consideration the impacts of roll gap, roll diameter, casting speed, and superheat in order to estimate the metallurgical length and slab temperature. This was done in order to calculate the metallurgical length
Mining Compressed Repetitive Gapped Sequential Patterns Efficiently
Creators: name: Tong, Yongxin
name: Zhao, Li
name: Yu, Dan
name: Ma, Shilong
name: Xu, Ke
Publisher: name: arXiv
Year: 2009
Subjects: subject: Databases (cs.DB)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences
subject: H.2.8

description: Mining frequent sequential patterns from sequence databases has been a central research topic in data mining and various efficient mining sequential patterns algorithms have been proposed and studied. Recently, in many problem domains (e.g, program execution traces), a novel sequential pattern mining research, called mining repetitive gapped sequential patterns, has attracted the attention of many researchers, considering not only the repetition of sequential pattern in different sequences but also the repetition within a sequence is more meaningful than the general sequential pattern mining which only captures occurrences in different sequences. However, the number of repetitive gapped sequential patterns generated by even these closed mining algorithms may be too large to understand for users, especially when support threshold is low. In this paper, we propose and study the problem of compressing repetitive gapped sequential patterns. Inspired by the ideas of summarizing frequent itemsets, RPglobal, we develop an algorithm, CRGSgrow (Compressing Repetitive Gapped Sequential pattern grow), including an efficient pruning strategy, SyncScan, and an efficient representative pattern checking scheme, -dominate sequential pattern checking. The CRGSgrow is a two-step approach: in the first step, we obtain all closed repetitive sequential patterns as the candidate set of representative repetitive sequential patterns, and at the same time get the most of representative repetitive sequential patterns; in the second step, we only spend a little time in finding the remaining the representative patterns from the candidate set. An empirical study with both real and synthetic data sets clearly shows that the CRGSgrow has good performance.
description: 19 pages, 7 figures
Regularities and symmetries of subsets of collective 0+ states
Creators: name: Bonatsos, Dennis
name: McCutchan, E. A.
name: Casten, R. F.
name: Casperson, R. J.
name: Werner, V.
name: Williams, E.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The energies of subsets of excited 0+ states in geometric collective models are investigated and found to exhibit intriguing regularities. In models with an infinite square well potential, it is found that a single formula, dependent on only the number of dimensions, describes a subset of 0+ states. The same behavior of a subset of 0+ states is seen in the large boson number limit of the Interacting Boson Approximation (IBA) model near the critical point of a first order phase transition, in contrast to the fact that these 0+ state energies exhibit a harmonic behavior in all three limiting symmetries of the IBA. Finally, the observed regularities in 0+ energies are analyzed in terms of the underlying group theoretical framework of the different models.
description: 9 pages, 3 figures, added reference [38]
Giant planet formation in stellar clusters: the effects of stellar fly-bys
Creators: name: Fragner, Moritz
name: Nelson, Richard
Publisher: name: arXiv
Year: 2009
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The primary aim of this work is to examine the effect of parabolic stellar encounters on the evolution of a Jovian-mass giant planet forming within a protoplanetary disc. We consider the effect on both the mass accretion and the migration history as a function of encounter distance. We use a grid-based hydrodynamics code to perform 2D simulations of a system consisting of a giant planet embedded within a gaseous disc orbiting around a star, which is perturbed by a passing star on a prograde, parabolic orbit. The disc model extends out to 50 AU, and parabolic encounters are considered with impact parameters ranging from 100 - 250 AU. In agreement with previous work, we find that the disc is significantly tidally truncated for encounters < 150 AU, and the removal of angular momentum from the disc by the passing star causes a substantial inflow of gas through the disc. The gap formed by the embedded planet becomes flooded with gas, causing the gas accretion rate onto the planet to increase abruptly. Gas flow through the gap, and into the inner disc, causes the positive inner disc torques exerted on the planet to increase, resulting in a sustained period of outward migration. For weaker interactions, corresponding to an encounter distance of > 250 AU, we find that the planet-disc system experiences minimal perturbation. Our results indicate that stellar fly-bys in young clusters may significantly modify the masses and orbital parameters of giant planets forming within protostellar discs. Planets that undergo such encounters are expected to be more massive, and to orbit with larger semimajor axes, than planets in systems which have not experienced parabolic encounters.
description: 19 pages, 20 figures, this paper has been accepted already at Astronomy and Astrophysics on 23.07.2009