cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Direct Photon Production in Proton-Nucleus and Nucleus-Nucleus Collisions
Creators: name: Cepila, J.
name: Nemchik, J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Prompt photons produced in a hard reaction are not accompanied with any final state interaction, either energy loss or absorption. Therefore, besides the Cronin enhancement at medium transverse momenta pT and small isotopic corrections at larger pT, one should not expect any nuclear effects. However, data from PHENIX experiment exhibit a significant large-pT suppression in central d+Au and Au+Au collisions that cannot be accompanied by coherent phenomena. We demonstrate that such an unexpected result is subject to the energy sharing problem near the kinematic limit and is universally induced by multiple initial state interactions. We describe production of photons in the color dipole approach and find a good agreement with available data in p+p collisions. Besides explanation of large-pT nuclear suppression at RHIC we present for the first time predictions for expected nuclear effects also in the LHC energy range at different rapidities. We include and analyze also a contribution of gluon shadowing as a leading twist shadowing correction modifying nuclear effects at small and medium pT.
description: 4 pages, 3 figures. Talk given at the 6th International Conference on Physics and Astrophysics of Quark Gluon Plasma (ICPAQGP-2010), Goa, India, December 6-10, 2010
Bubble size prediction in co-flowing streams
Creators: name: van Hoeve, Wim
name: Dollet, Benjamin
name: Gordillo, José M.
name: Versluis, Michel
name: Lohse, Detlef
Publisher: name: arXiv
Year: 2011
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: In this paper, the size of bubbles formed through the breakup of a gaseous jet in a co-axial microfluidic device is derived. The gaseous jet surrounded by a co-flowing liquid stream breaks up into monodisperse microbubbles and the size of the bubbles is determined by the radius of the inner gas jet and the bubble formation frequency. We obtain the radius of the gas jet by solving the Navier-Stokes equations for low Reynolds number flows and by minimization of the dissipation energy. The prediction of the bubble size is based on the system's control parameters only, i.e. the inner gas flow rate $Q_i$, the outer liquid flow rate $Q_o$, and the tube radius $R$. For a very low gas-to-liquid flow rate ratio ($Q_i / Q_o \rightarrow 0$) the bubble radius scales as $r_b / R \propto \sqrt{Q_i / Q_o}$, independently of the inner to outer viscosity ratio $η_i/η_o$ and of the type of the velocity profile in the gas, which can be either flat or parabolic, depending on whether high-molecular-weight surfactants cover the gas-liquid interface or not. However, in the case in which the gas velocity profiles are parabolic and the viscosity ratio is sufficiently low, i.e. $η_i/η_o \ll 1$, the bubble diameter scales as $r_b \propto (Q_i/Q_o)^β$, with $β$ smaller than 1/2.
NASA & NOAA Umum Suhu Global dan Keadaan Iklim Bumi Tahun 2023 Esok
Creators: name: Ating, Rashid
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 390107
subject: Humanities and social sciences curriculum and pedagogy (excl. economics, business and management)
classificationCode: 460105
subject: Applications in social sciences and education
classificationCode: 500206
subject: History and philosophy of the social sciences

description: Washington - Penyelidik iklim dari Pentadbiran Aeronoutik dan Angkasa Lepas Kebangsaan (NASA) dan Pentadbiran Lautan dan Atmosfera Kebangsaan (NOAA) akan mengeluarkan penilaian tahunan berkenaan dengan suhu global dan membincangkan aliran iklim utama dunia semasa pada tahun 2023 dalam sidang media, pagi esok, pada pukul 11.00 pagi (zon waktu timur)
Vesta and Ceres: crossing the history of the Solar System
Creators: name: Coradini, Angioletta
name: Turrini, Diego
name: Federico, Costanzo
name: Magni, Gianfranco
Publisher: name: arXiv
Year: 2011
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The evolution of the Solar System can be schematically divided into three different phases: the Solar Nebula, the Primordial Solar System and the Modern Solar System. These three periods were characterized by very different conditions, both from the point of view of the physical conditions and from that of the processes there were acting through them. Across the Solar Nebula phase, planetesimals and planetary embryos were forming and differentiating due to the decay of short-lived radionuclides. At the same time, giant planets formed their cores and accreted the nebular gas to reach their present masses. After the gas dispersal, the Primordial Solar System began its evolution. In the inner Solar System, planetary embryos formed the terrestrial planets and, in combination with the gravitational perturbations of the giant planets, depleted the residual population of planetesimals. In the outer Solar System, giant planets underwent a violent, chaotic phase of orbital rearrangement which caused the Late Heavy Bombardment. Then the rapid and fierce evolution of the young Solar System left place to the more regular secular evolution of the Modern Solar System. Vesta, through its connection with HED meteorites, and plausibly Ceres too were between the first bodies to form in the history of the Solar System. Here we discuss the timescale of their formation and evolution and how they would have been affected by their passage through the different phases of the history of the Solar System, in order to draw a reference framework to interpret the data that Dawn mission will supply on them.
description: 27 pages, 1 figure, 2 tables; the final publication is available at http://www.springerlink.com
Feasibility of Using a 50- by 30-Centimeter Cell Box for Exporting Mcintosh and Golden Delicious Apples
Creators: name: Mallison, Earl D.
name: Stokes, Donald R.
name: Mallison, Earl D.
name: Stokes, Donald R.
Publisher: name: Unknown
Year: 1970
Subjects: subject: Crop Production/Industries
subject: International Relations/Trade
subject: Labor and Human Capital
subject: Marketing
subject: FOS: Economics and business
subject: Research and Development/Tech Change/Emerging Technologies

description: Excerpts from the report: A committee representing the member countries of The Organization for Economic Cooperation and Development (OECD) is developing standard containers for fruits and vegetables moving in international trade. The purpose of this study was to ascertain the feasibility of packing and transporting to United Kingdom ports United States Mcintosh and Golden Delicious apples, sized in accordance with present commercial practices, in 50- by 30-cm. cell-type boxes. Apples were selected for this study since they have been exported in large volume for many years to European markets. A box having outside dimensions of 50 cm. (19.7 in.) long by 30 cm. (11.8 in.) wide was selected since this one, of all the OECD boxes, comes closest in size to the boxes commonly used in the United States for apples.
Modeling Particle Loss in Open Systems using Keldysh Path Integral and Second Order Cumulant Expansion
Creators: name: Huang, Chen-How
name: Giamarchi, Thierry
name: Cazalilla, Miguel A.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: For open quantum systems, integration of the bath degrees of freedom using the second order cumulant expansion in the Keldysh path integral provides an alternative derivation of the effective action for systems coupled to general baths. The baths can be interacting and not necessarily Markovian. Using this method in the Markovian limit, we compute the particle loss dynamics in various models of ultra-cold atomic gases including a one-dimensional Bose-Hubbard model with two-particle losses and a multi-component Fermi gas with interactions tuned by an optical Feshbach resonance. We explicitly demonstrate that the limit of strong two-body losses can be treated by formulating an indirect loss scheme to describe the bath-system coupling. The particle-loss dynamics thus obtained is valid at all temperatures. For the one-dimensional Bose-Hubbard model, we compare it to solutions of the phenomenological rate equations. The latter are shown to be accurate at high temperatures.
description: 14 pages, 4 figures
On the $\mathcal{P}\mathcal{T}$-symmetric parametric amplifier
Creators: name: Patra, Pinaki
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Parametric amplifiers are an integral part of measurements involving the conversion of propagating quantum information to mechanical motion. General time-dependent PT-symmetric parametric oscillators for unbroken parity and time reversal (PT) symmetry regimes are studied theoretically. By constructing an explicit metric operator, we have transformed the non-Hermitian PT-symmetric system to an equivalent Hermitian Hamiltonian, which enables us to utilize the available mechanism of $\mathbb{L}^2$ space. The time-dependent (TD) Schrödinger equation for the system is solved with the Lewis-Riesenfeld (LR) phase space method. The eigenstates of the LR-invariant operator ($\hat{\mathcal{I}}$) is obtained after transforming $\hat{\mathcal{I}}$ to its diagonal symplectic equivalent form (group $Sp(2, \mathbb{R})$). Both the dynamical and geometrical phase factors associated with the eigenstates of $\hat{\mathcal{I}}$ are explicitly written. The experimental pheasibility of our result is outlined through the construction of Wigner quasiprobability distribution. Moreover, we have demostrated the time variation of the Wigner distribution for the system consisting of two spatially separated prepared ground state of the TD-parametric amplifier. With graphical illustration of time variation of Wigner distributions, we show that the phase-space entanglement remains intact even for time-dependent situation, no matter how far the particles goes, at least for the cat-state under consideration. The exact expressions for the physically relevant qualities are obtained and illustrated for a toy model.
description: 21 pages, 10 figures
Bipheny Residues, Decay and Spoilage in Oranges: Effect of Carton Ventings, Barriers, and Biphenyl Dosages During Storage
Creators: name: Norman, Shirley
name: Craft, C. C.
name: Fouse, D. C.
name: Rygg, G. L.
name: Norman, Shirley
name: Craft, C. C.
name: Fouse, D. C.
name: Rygg, G. L.
Publisher: name: Unknown
Year: 1969
Subjects: subject: Crop Production/Industries
subject: Food Consumption/Nutrition/Food Safety
subject: Marketing
subject: FOS: Economics and business
subject: Research and Development/Tech Change/Emerging Technologies

description: Excerpts from the report: Biphenyl has been used to control decay and soil-age in citrus fruit since Tomkins first reported its effectiveness in 1935. The commercial practice is to use kraft paper treated with biphenyl at the rate of 4 to 5 pounds per thousand square feet. This usage insures that an adequate quantity of biphenyl will be available during the marketing period for both domestic and overseas shipments. Two pads of this treated paper are placed in each carton of citrus fruit during packaging, placement varying with individual shippers. The legal tolerance for biphenyl residues in the United States in citrus fruits has been 110 p.p.m. since 1956. The European Economic Community (EEC) adopted a legal tolerance of 70 p.p.m. in 1968. The purpose of this study was to determine to what extent levels of biphenyl residue, decay, and soilage in oranges could be controlled (1) by the addition and removal of biphenyl after different intervals during storage, or (2) by the placement of barriers between the fruit and the biphenyl-treated pads. Another objective was to determine whether decay and soilage could be controlled without the use of biphenyl (1) by wrapping oranges individually in polyethylene film and storing, and (2) by storing unwrapped fruit with polyethylene-coated kraft paper placed between the layers of fruit. Length and temperatures of storage simulated those required for shipment to western European ports and distribution to the various EEC markets.
Quantum gauge fields and flat connections in 2-dimensional BF theory
Creators: name: Alekseev, Anton
name: Ilieva, Nevena
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 81T45

description: The 2-dimensional BF theory is both a gauge theory and a topological Poisson $σ$-model corresponding to a linear Poisson bracket. In \cite{To1}, Torossian discovered a connection which governs correlation functions of the BF theory with sources for the $B$-field. This connection is flat, and it is a close relative of the KZ connection in the WZW model. In this paper, we show that flatness of the Torossian connection follows from (properly regularized) quantum equations of motion of the BF theory.
description: 12 pages, 8 figures
Global X-ray properties of the O and B stars in Carina
Creators: name: Naze, Y.
name: Broos, P. S.
name: Oskinova, L.
name: Townsley, L. K.
name: Cohen, D.
name: Corcoran, M. F.
name: Evans, N. R.
name: Gagne, M.
name: Moffat, A. F. J.
name: Pittard, J. M.
name: Rauw, G.
name: ud-Doula, A.
name: Walborn, N. R.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The key empirical property of the X-ray emission from O stars is a strong correlation between the bolometric and X-ray luminosities. In the framework of the Chandra Carina Complex Project, 129 O and B stars have been detected as X-ray sources; 78 of those, all with spectral type earlier than B3, have enough counts for at least a rough X-ray spectral characterization. This leads to an estimate of the Lx/Lbol ratio for an exceptional number of 60 O stars belonging to the same region and triples the number of Carina massive stars studied spectroscopically in X-rays. The derived log(Lx/Lbol) is -7.26 for single objects, with a dispersion of only 0.21dex. Using the properties of hot massive stars listed in the literature, we compare the X-ray luminosities of different types of objects. In the case of O stars, the Lx/Lbol ratios are similar for bright and faint objects, as well as for stars of different luminosity classes or spectral types. Binaries appear only slightly harder and slightly more luminous in X-rays than single objects; the differences are not formally significant (at the 1% level), except for the Lx/Lbol ratio in the medium (1.0--2.5keV) energy band. Weak-wind objects have similar X-ray luminosities but they display slightly softer spectra compared to "normal" O stars with the same bolometric luminosity. Discarding three overluminous objects, we find a very shallow trend of harder emission in brighter objects. The properties of the few B stars bright enough to yield some spectral information appear to be different overall (constant X-ray luminosities, harder spectra), hinting that another mechanism for producing X-rays, besides wind shocks, might be at work. However, it must be stressed that the earliest and X-ray brightest amongst these few detected objects are similar to the latest O stars, suggesting a possibly smooth transition between the two processes.
description: 30 pages, 9 figures. Accepted for the ApJS Special Issue on the Chandra Carina Complex Project (CCCP), scheduled for publication in May 2011. All 16 CCCP Special Issue papers are available at http://cochise.astro.psu.edu/Carina_public/special_issue.html through 2011 at least
Possible mechanism responsible for observed impurity outward flow under radio frequency heating
Creators: name: Moradi, S.
name: Fülöp, T.
name: Mollén, A.
name: Pusztai, I.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The effect of poloidal asymmetry of impurities on impurity transport driven by electrostatic turbulence in tokamak plasmas is analyzed. It is found that in the presence of in-out asymmetric impurity populations the zero-flux impurity density gradient (the so-called peaking factor) is significantly reduced. A sign change in the impurity flux may occur if the asymmetry is sufficiently large. This may be a contributing reason for the observed outward convection of impurities in the presence of radio frequency heating. The effect of in-out asymmetry is most significant in regions with low temperature gradients. In the trapped electron mode dominated case also an up-down asymmetry can lead to a sign change in the peaking factor from positive to negative. The effect of ion parallel compressibility on the peaking factor is significant, and leads to positive peaking factors in regions with high temperature gradients, even in the presence of in-out asymmetry.
description: 19 pages, 14 figures
Project Handbook
Creators: name: Grillo, Vincenzo
name: Gazzadi, Giancarlo
name: Santucci, Raffaella
name: Gilberti, Luca
Publisher: name: Zenodo
Year: 2017

description: The purpose of this deliverable is to establish the procedures and methodologies to be adopted during the Q-SORT project lifetime. The objective is to guarantee the successful running and achievement of the project goals while ensuring consensus on activities between project members through the provision of a reference point that establishes the standards and rules to be adopted.

In particular, this deliverable defines a set of rules for the organisation of day-to-day cooperative work within the project, including the procedures to be used, the reporting mechanisms, the organisation of meetings, the control of information flow, the reliability of the output, and the preparation of documentation for submission to the EC.
Avoidance of multicast incapable branching nodes for multicast routing in WDM networks
Creators: name: Zhou, Fen
name: Molnar, Miklos
name: Cousin, Bernard
Publisher: name: arXiv
Year: 2010
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: In this articlewestudy themulticast routing problem in all-opticalWDMnetworks under the spare light splitting constraint. To implement a multicast session, several light-trees may have to be used due to the limited fanouts of network nodes. Although many multicast routing algorithms have been proposed in order to reduce the total number of wavelength channels used (total cost) for a multicast session, the maximum number of wavelengths required in one fiber link (link stress) and the end-to-end delay are two parameters which are not always taken into consideration. It is known that the shortest path tree (SPT) results in the optimal end-to-end delay, but it can not be employed directly for multicast routing in sparse light splitting WDM networks. Hence, we propose a novel wavelength routing algorithm which tries to avoid the multicast incapable branching nodes (MIBs, branching nodes without splitting capability) in the shortest-path-based multicast tree to diminish the link stress. Good parts of the shortest-path-tree are retained by the algorithm to reduce the end-to-end delay. The algorithm consists of tree steps: (1) aDijkstraPro algorithmwith priority assignment and node adoption is introduced to produce a SPT with up to 38% fewer MIB nodes in the NSF topology and 46% fewerMIB nodes in the USA Longhaul topology, (2) critical articulation and deepest branch heuristics are used to process the MIB nodes, (3) a distance-based light-tree reconnection algorithm is proposed to create the multicast light-trees. Extensive simulations demonstrate the algorithm's efficiency in terms of link stress and end-to-end delay.
RaSa: Relation and Sensitivity Aware Representation Learning for Text-based Person Search
Creators: name: Bai, Yang
name: Cao, Min
name: Gao, Daming
name: Cao, Ziqiang
name: Chen, Chen
name: Fan, Zhenfeng
name: Nie, Liqiang
name: Zhang, Min
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Text-based person search aims to retrieve the specified person images given a textual description. The key to tackling such a challenging task is to learn powerful multi-modal representations. Towards this, we propose a Relation and Sensitivity aware representation learning method (RaSa), including two novel tasks: Relation-Aware learning (RA) and Sensitivity-Aware learning (SA). For one thing, existing methods cluster representations of all positive pairs without distinction and overlook the noise problem caused by the weak positive pairs where the text and the paired image have noise correspondences, thus leading to overfitting learning. RA offsets the overfitting risk by introducing a novel positive relation detection task (i.e., learning to distinguish strong and weak positive pairs). For another thing, learning invariant representation under data augmentation (i.e., being insensitive to some transformations) is a general practice for improving representation's robustness in existing methods. Beyond that, we encourage the representation to perceive the sensitive transformation by SA (i.e., learning to detect the replaced words), thus promoting the representation's robustness. Experiments demonstrate that RaSa outperforms existing state-of-the-art methods by 6.94%, 4.45% and 15.35% in terms of Rank@1 on CUHK-PEDES, ICFG-PEDES and RSTPReid datasets, respectively. Code is available at: https://github.com/Flame-Chasers/RaSa.
description: Accepted by IJCAI 2023. Code is available at https://github.com/Flame-Chasers/RaSa
Experimental Spin Ratchet
Creators: name: Costache, Marius V.
name: Valenzuela, Sergio O.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Spintronics relies on the ability to transport and utilize the spin properties of an electron rather than its charge. We describe a spin rachet at the single-electron level that produces spin currents with no net bias or charge transport. Our device is based on the ground state energetics of a single electron transistor comprising a superconducting island connected to normal leads via tunnel barriers with different resistances that break spatial symmetry. We demonstrate spin transport and quantify the spin ratchet efficiency using ferromagnetic leads with known spin polarization. Our results are modeled theoretically and provide a robust route to the generation and manipulation of pure spin currents.
description: 24 pages, 7 figures (includes supplementary material)
Confirmation of the Supergiant Fast X-ray Transient nature of AX J1841.0-0536 from Swift outburst observations
Creators: name: Romano, P.
name: Mangano, V.
name: Cusumano, G.
name: Esposito, P.
name: Evans, P. A.
name: Kennea, J. A.
name: Vercellone, S.
name: La Parola, V.
name: Krimm, H. A.
name: Burrows, D. N.
name: Gehrels, N.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Swift observed an outburst from the supergiant fast X-ray transients (SFXT) AX J1841.0-0536 on 2010 June 5, and followed it with XRT for 11 days. The X-ray light curve shows an initial flare followed by a decay and subsequent increase, as often seen in other SFXTs, and a dynamical range of ~1600. Our observations allow us to analyse the simultaneous broad-band (0.3-100 keV) spectrum of this source, for the first time down to 0.3 keV, can be fitted well with models usually adopted to describe the emission from accreting neutron stars in high-mass X-ray binaries, and is characterized by a high absorption (N_H~2x10^22 cm-2), a flat power law (Gamma~0.2), and a high energy cutoff. All of these properties resemble those of the prototype of the class, IGR J17544-2619, which underwent an outburst on 2010 March 4, whose observations we also discuss. We show how well AX J1841.0-0536 fits in the SFXT class, based on its observed properties during the 2010 outburst, its large dynamical range in X-ray luminosity, the similarity of the light curve (length and shape) to those of the other SFXTs observed by Swift, and the X-ray broad-band spectral properties.
description: Accepted for publication in MNRAS Letters. 6 pages, 6 figures, 2 tables
Supplementary document for Strong, anisotropic, layer-independent second harmonic generation in multilayer SnS Film - 6285881.pdf
Creators: name: Xie, Ying
name: Yu, Hao
name: Wei, Jiahui
name: he, qianming
name: Yu, Haohai
name: Zhang, Huaijin
Publisher: name: Optica Publishing Group
Year: 2023
Subjects: Uncategorized

description: Supplement 1
Improving the detection of transcription factor binding regions
Creators: name: Hunt, Christine Rebecca
Publisher: name: University of British Columbia
Year: 2014

description: The identification of non-coding regulatory elements in the genome has been the focus of much experimental and computational effort. However, both experimental data, such as ChIP-seq, and computational methods of transcription factor (TF) binding predictions suffer from a degree of non-specificity. ChIP-seq experiments report regions that don’t contain the expected canonical motif for the ChIPped TF, which may arise from indirect binding or a non-TF-specific mechanism. Computational predictions based on sequence-level information alone are plagued by false positives. This thesis explores computational approaches to improve both the interpretation of large-scale TF binding data, and the detection of TF binding regions. In Chapters 2 and 3 we observe that experimentally defined regulatory regions of the human genome are a mixture of sub-groups reflecting distinct properties. On average a third of a ChIP-seq dataset does not contain the targeted TF’s motif, and within this subset up to 45% of the ChIP-seq peaks are unexpectedly enriched for a small class of non-targeted TFs’ motifs. Many of these regions are not specific to a TF but are ChIPped by multiple diverse TFs across multiple cell types. These recurring regions tend to be the lower scoring peaks of a dataset, are less likely to reproduce between experimental replicates, and tend to associate with cohesin and polycomb protein occupied positions in the genome. The regulatory regions with a greater specificity for a TF do not share these properties. Based on these observations we suggest a TF ‘loading-zone’ model to account for the presence of the aforementioned recurrent regions in ChIP-seq data. In Chapter 4 we further explore the regulatory region subgroups with a biophysical simulator of TF occupancy (tfOS). Within tfOS we have incorporated TF-DNA interaction energies, TF search mechanics, cooperative TF interactions, and sequence accessibility data into the model. Simulations with tfOS across sequences reveal distinct features associated with recurrent and non-recurrent regions described in Chapter 3. The research presented has improved our understanding and interpretation of large-scale TF binding data and advanced our understanding of TF regulatory regions, leading to improved annotation and interpretation of the human genome.
Ferromagnetic and antiferromagnetic dimer splittings in LaMn0.1Ga0.9O3
Creators: name: Furrer, A.
name: Pomjakushina, E.
name: Pomjakushin, V.
name: Embs, J. P.
name: Straessle, Th.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Inelastic neutron scattering was employed to study the magnetic excitations of Mn3+ dimers in LaMn0.1Ga0.9O3. The nearest-neighbor interaction of Mn3+ ions is ferromagnetic in the basal (a,b)-plane, but antiferromagnetic along the c-direction, thus two different types of dimer excitations are simultaneously present in the experiments. From the observed energy spectra we derive Heisenberg-type exchange interactions Jab=0.210(4) meV and Jc=-0.285(5) meV as well as an axial anisotropy parameter D=0.036(6) meV. These parameters considerably differ from those derived for the isostructural parent compound LaMnO3 due to structural effects.
description: 21 pages, 5 figures, 3 tables
GGD 37: An Extreme Protostellar Outflow
Creators: name: Green, J. D.
name: Watson, D. M.
name: Bergin, E.
name: Maret, S.
name: Melnick, G.
name: Sonnentrucker, P.
name: Tolls, V.
name: Sargent, B. A.
name: Forrest, W. J.
name: Kim, K. H.
name: Raines, S. N.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the first Spitzer-IRS spectral maps of the Herbig-Haro flow GGD 37 detected in lines of [Ne III], [O IV], [Ar III], and [Ne V]. The detection of extended [O IV] (55 eV) and some extended emission in [Ne V] (97 eV) indicates a shock temperature in excess of 100,000 K, in agreement with X-ray observations, and a shock speed in excess of 200 km s-1. The presence of an extended pho- toionization or collisional ionization region indicates that GGD 37 is a highly unusual protostellar outflow.
description: 5 pages, 4 figures, accepted 17 Nov. 2010
Stationarity and Geometric Ergodicity of BEKK Multivariate GARCH Models
Creators: name: Boussama, Farid
name: Fuchs, Florian
name: Stelzer, Robert
Publisher: name: arXiv
Year: 2011
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60J05, 60B99, 62M10, 91G70

description: Conditions for the existence of strictly stationary multivariate GARCH processes in the so-called BEKK parametrisation, which is the most general form of multivariate GARCH processes typically used in applications, and for their geometric ergodicity are obtained. The conditions are that the driving noise is absolutely continuous with respect to the Lebesgue measure and zero is in the interior of its support and that a certain matrix built from the GARCH coefficients has spectral radius smaller than one. To establish the results semi-polynomial Markov chains are defined and analysed using algebraic geometry.
description: version to appear in Stochastic Processes and their Applications, 2011; http://www.sciencedirect.com/science/article/pii/S0304414911001372
Commercial Floriculture and Related Products: An Analysis of Purchases and Buyers of Goods and Services, Marketing Year Ended May 1967
Creators: name: Hall, Richard
name: Raleigh, Stephen M.
name: Hall, Richard
name: Raleigh, Stephen M.
Publisher: name: Unknown
Year: 1969
Subjects: subject: Crop Production/Industries
subject: Marketing
subject: FOS: Economics and business
subject: Research Methods/ Statistical Methods

description: Excerpts from the report: Commercial floriculture today is a $2-billion-a-year business at the retail level, including goods and services. Farm cash receipts from saleable products for this market exceed $700 million annually. Producers forming this important segment of the agricultural economy need information concerning customer demand for their products. This report presents data concerning purchases and characteristics of purchasers of cut flowers, flowering plants, and related products. Data were obtained from June 1966 through May 1967 through personal interviews with a probability sample of some 15,000 U.S. consumers aged 18 and over. Findings were expanded to represent the 128 million adults who were potential buyers of the products studied. Goods and services purchased were identified as follows: Floral arrangements, unarranged cut flowers, and corsages; potted plants, bedding plants, nursery stock, artificial flowers and plants; and other products (such as florist greens, flowers and plants with special treatments). Factors that might lead to increased purchases, reasons for purchasing and reasons for not purchasing also were obtained to provide more information why some persons bought, why others did not.
Baryon to meson transition distribution amplitudes and their spectral representation
Creators: name: Pire, Bernard
name: Semenov-Tian-Shansky, Kirill
name: Szymanowski, Lech
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider the problem of construction of a spectral representation for nucleon to meson transition distribution amplitudes (TDAs), non-diagonal matrix elements of nonlocal three quark light-cone operators between a nucleon and a meson states. We introduce the notion of quadruple distributions and generalize Radyshkin's factorized Ansatz for this issue. Modelling of baryon to meson TDAs in the complete domain of their definition opens the way to quantitative estimates of cross-sections for various hard exclusive reactions.
description: Talk presented at International Workshop on Diffraction in High-Energy Physics DIFFRACTION 2010, September 10 - 15, 2010 Otranto (Lecce), Italy. 4 pages
On the Tree-Level Structure of Scattering Amplitudes of Massless Particles
Creators: name: Benincasa, Paolo
name: Conde, Eduardo
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We provide a new set of on-shell recursion relations for tree-level scattering amplitudes, which are valid for any non-trivial theory of massless particles. In particular, we reconstruct the scattering amplitudes from (a subset of) their poles and zeroes. The latter determine the boundary term arising in the BCFW-representation when the amplitudes do not vanish as some momenta are taken to infinity along some complex direction. Specifically, such a boundary term can be expressed as a sum of products of two on-shell amplitudes with fewer external states and a factor dependent on the location of the relevant zeroes and poles. This allows us to recast the amplitudes to have the standard BCFW-structure, weighted by a simple factor dependent on a subset of zeroes and poles of the amplitudes. We further comment on the physical interpretation of the zeroes as a particular kinematic limit in the complexified momentum space. The main implication of the existence of such recursion relations is that the tree-level approximation of any consistent theory of massless particles can be fully determined just by the knowledge of the corresponding three-particle amplitudes.
description: 31 pages, 5 figures
A nonhomogeneous boundary value problem in mass transfer theory
Creators: name: Crasta, Graziano
name: Malusa, Annalisa
Publisher: name: arXiv
Year: 2011
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35A02

description: We prove a uniqueness result of solutions for a system of PDEs of Monge-Kantorovich type arising in problems of mass transfer theory. The results are obtained under very mild regularity assumptions both on the reference set $Ω\subset\mathbf{R}^n$, and on the (possibly asymmetric) norm defined in $Ω$. In the special case when $Ω$ is endowed with the Euclidean metric, our results provide a complete description of the stationary solutions to the tray table problem in granular matter theory.
description: 22 pages, 2 figures
Enhanced DNA sequencing performance through edge-hydrogenation of graphene electrodes
Creators: name: He, Yuhui
name: Scheicher, Ralph H.
name: Grigoriev, Anton
name: Ahuja, Rajeev
name: Long, Shibing
name: Huo, ZongLiang
name: Liu, Ming
Publisher: name: arXiv
Year: 2010
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We propose using graphene electrodes with hydrogenated edges for solid-state nanopore-based DNA sequencing, and perform molecular dynamics simulations in conjunction with electronic transport calculations to explore the potential merits of this idea. The results of our investigation show that, compared to the unhydrogenated system, edge-hydrogenated graphene electrodes facilitate the temporary formation of H-bonds with suitable atomic sites in the translocating DNA molecule. As a consequence, the average conductivity is drastically raised by about 3 orders of magnitude while exhibiting significantly reduced statistical variance. We have furthermore investigated how these results are affected when the distance between opposing electrodes is varied and have identified two regimes: for narrow electrode separation, the mere hindrance due to the presence of protruding hydrogen atoms in the nanopore is deemed more important, while for wider electrode separation, the formation of H-bonds becomes the dominant effect. Based on these findings, we conclude that hydrogenation of graphene electrode edges represents a promising approach to reduce the translocation speed of DNA through the nanopore and substantially improve the accuracy of the measurement process for whole-genome sequencing.
description: 15 pages, 4 figures
Overseas Shipping Tests of California Citrus on Pallets and in Containers -- Interrelations Between Transit Temperatures, Biphenyl Pad Placement, Biphenyl Content, and Fruit Condition
Creators: name: Rygg, G. L.
name: Rygg, G. L.
Publisher: name: Unknown
Year: 1969
Subjects: subject: Crop Production/Industries
subject: Food Consumption/Nutrition/Food Safety
subject: International Relations/Trade
subject: Marketing
subject: FOS: Economics and business
subject: Research and Development/Tech Change/Emerging Technologies

description: Excerpts from the report: Recent developments in facilities used to transport California citrus fruits to the European markets include pallets, mechanically refrigerated railcars, and cargo containers. Little or no experimental data are available on the residue of the volatile fungistat biphenyl and the condition of fruit handled in these facilities. This information was needed because of the 70 p.p.m. biphenyl tolerance of the European Economic Community (EEC). To secure such information, three test shipments of Valencia oranges were sent to Rotterdam, Holland, using different sizes of pallets for two shipments and the break-bulk method for the other. Two test shipments of lemons in cargo containers also were sent to Rotterdam.
Duality and Local Cohomology in Hodge Theory
Creators: name: Hiatt, Scott M
Publisher: name: Purdue University Graduate School
Year: 2023
Subjects: Algebraic and differential geometry

description: A Hodge module on an algebraic variety may be viewed as a variation of Hodge structure with singularities. Given an irreducible variety $X$, for any polarized variation of Hodge structure $\bold{H}$ on a smooth open subvariety $U\subset X,$ there exists a unique Hodge module $\cM \in HM_{X}(X)$ that extends $\bH.$ Conversely, for any Hodge module $\cM \in HM_{X}(X)$ with strict support on $X,$ there exists a polarized variation of Hodge structure $\bH$ on a smooth open subset $U \subset X$ such that $\cM \vert _{V} \cong \bH.$ In this thesis, we first study the singularities of a Hodge module $\cM \in HM_{X}(X)$ by using Morihiko Saito's theory of $S$-sheaves and duality. Then using local cohomology and the theory of mixed Hodge modules, we study the Hodge structure of $H^{i}(X, DR(\cM))$ when $X$ is a projective variety. Finally, we consider a variation of Hodge structure $\bH$ on $U$ as a Hodge module $\cN \in HM(U)$ on $U,$ and study the local cohomology of the complex $Gr^{F}_{p}DR(j_{!}\cN) \in D^{b}_{coh}(\cO_{X}),$ where $j: U \hookrightarrow X$ is the natural map.
Testing of sequences by simulation
Creators: name: Iványi, Antal
name: Novák, Balázs
Publisher: name: arXiv
Year: 2010
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences
subject: G.2.2
subject: 68M20

description: Let $ξ$ be a random integer vector, having uniform distribution \[\mathbf{P} \{ξ= (i_1,i_2,...,i_n) = 1/n^n \} \ \hbox{for} \ 1 \leq i_1,i_2,...,i_n\leq n.\] A realization $(i_1,i_2,...,i_n)$ of $ξ$ is called \textit{good}, if its elements are different. We present algorithms \textsc{Linear}, \textsc{Backward}, \textsc{Forward}, \textsc{Tree}, \textsc{Garbage}, \textsc{Bucket} which decide whether a given realization is good. We analyse the number of comparisons and running time of these algorithms using simulation gathering data on all possible inputs for small values of $n$ and generating random inputs for large values of $n$.
Action valuation of on- and off-ball soccer players based on multi-agent deep reinforcement learning
Creators: name: Nakahara, Hiroshi
name: Tsutsui, Kazushi
name: Takeda, Kazuya
name: Fujii, Keisuke
Publisher: name: arXiv
Year: 2023
Subjects: subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Analysis of invasive sports such as soccer is challenging because the game situation changes continuously in time and space, and multiple agents individually recognize the game situation and make decisions. Previous studies using deep reinforcement learning have often considered teams as a single agent and valued the teams and players who hold the ball in each discrete event. Then it was challenging to value the actions of multiple players, including players far from the ball, in a spatiotemporally continuous state space. In this paper, we propose a method of valuing possible actions for on- and off-ball soccer players in a single holistic framework based on multi-agent deep reinforcement learning. We consider a discrete action space in a continuous state space that mimics that of Google research football and leverages supervised learning for actions in reinforcement learning. In the experiment, we analyzed the relationships with conventional indicators, season goals, and game ratings by experts, and showed the effectiveness of the proposed method. Our approach can assess how multiple players move continuously throughout the game, which is difficult to be discretized or labeled but vital for teamwork, scouting, and fan engagement.
description: 12 pages, 4 figures, published in IEEE Access. The latest version is at https://ieeexplore.ieee.org/document/10328596
Bias-Controlled Selective Excitation of Vibrational Modes in Molecular Junctions: A Route Towards Mode-Selective Chemistry
Creators: name: Volkovich, R.
name: Härtle, R.
name: Thoss, M.
name: Peskin, U.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We show that individual vibrational modes in single-molecule junctions with asymmetric molecule-lead coupling can be selectively excited by applying an external bias voltage. Thereby, a non-statistical distribution of vibrational energy can be generated, that is, a mode with a high frequency can be stronger excited than a mode with a lower frequency. This is of particular interest in the context of mode-selective chemistry, where one aims to break specific (not necessarily the weakest) chemical bond in a molecule. Such mode-selective vibrational excitation is demonstrated for two generic model systems representing asymmetric molecular junctions and/or scanning tunneling microscopy experiments. To this end, we employ two complementary theoretical approaches, a nonequilibrium Green's function approach and a master equation approach. The comparison of both methods reveals good agreement in describing resonant electron transport through a single-molecule contact, but also highlights the role of non-resonant transport processes, in particular co-tunneling and off-resonant electron-hole pair creation processes.
description: 46 pages, 17 figures, accepted in PCCP
Resource optimization in relay based cooperative wireless systems under channel uncertainty
Creators: name: Mallick, Shankhanaad
Publisher: name: University of British Columbia
Year: 2014

description: Over the last decade, the demand for wireless resources has been rising exponentially with the increase of the number of new users and services. The primary objective of wireless communication research is finding solutions to meet this increasing demand with limited radio resources. Relay based cooperative systems greatly enhance the performance of resource-constrained wireless networks. By allowing cooperation via relays, it is possible to improve the transmission quality and energy efficiency and get similar benefits to those of multiple-input-multiple-output (MIMO) systems. However, the benefits of a relay based cooperation often depend on the channel state information (CSI) between various nodes. The CSI of such multi-hop systems is often imperfect and outdated due to channel fluctuations, limited feedback capacity, and channel estimation and quantization errors. To maximize the utilization of the radio resources, it is imperative to devise optimal resource allocation schemes that are robust under imperfect CSI. In this thesis, we consider different resource optimization problems for relay based cooperative systems and propose solutions that are robust and computationally efficient. First, we develop power allocation and relay selection schemes for a decode-and-forward (DF) cooperative wireless network under bounded channel uncertainty. We propose worst case optimization based approach to provide guaranteed quality-of-service (QoS) to the users. Next, we design a joint power allocation and admission control algorithm considering channel estimation error as unbounded Gaussian random variable. We propose a probabilistically-constrained optimization approach for QoS provisioning in slow fading channels. Finally, we propose to utilize user cooperation technique to establish communication among the secondary users (SUs) of a cognitive radio network (CRN). Power allocation and relay selection schemes that maximize the system goodput of the CRN are developed. We provide QoS to the SUs while satisfying the interference constraints of the primary user bands considering different channel uncertainty models. Numerical results demonstrate the effectiveness of our proposed schemes and implications of ignoring channel estimation error while designing resource optimization algorithms. Results reveal that the effects of ignoring the imperfectness among different channels are violations of QoS and interference constraints, which ultimately result in transmission failures and wastage of transmission power.
Green Segment Routing for Improved Sustainability of Backbone Networks
Creators: name: Otten, Daniel
name: Brundiers, Alexander
name: Schüller, Timmy
name: Aschenbruck, Nils
Publisher: name: arXiv
Year: 2023
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Improving the energy efficiency of Internet Service Provider (ISP) backbone networks is an important objective for ISP operators. In these networks, the overall traffic load throughout the day can vary drastically, resulting in many backbone networks being highly overprovisioned during periods of lower traffic volume. In this paper, we propose a new Segment Routing (SR)-based optimization algorithm that aims at reducing the energy consumption of networks during such low-traffic periods. It uses the traffic steering capabilities of SR to remove traffic from as many links as possible to allow the respective hardware components to be switched off. Furthermore, it simultaneously ensures that solutions comply to additional operator requirements regarding the overall Maximum Link Utilization in the network. Based on data from a Tier-1 ISP and a public available dataset, we show that our approach allows for up to 70 % of the overall linecards to be switched off, corresponding to an around 56% reduction of the overall energy consumption of the network in times of low traffic demands.
description: This work has been submitted to IEEE for possible publication. Copyright may be transferred without notice