cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Contribution of the second Landau level to the exchange energy of the three-dimensional electron gas in a high magnetic field
Creators: name: Morbec, J. M.
name: Capelle, K.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We derive a closed analytical expression for the exchange energy of the three-dimensional interacting electron gas in strong magnetic fields, which goes beyond the quantum limit (L=0) by explicitly including the effect of the second, L=1, Landau level and arbitrary spin polarization. The inclusion of the L=1 level brings the fields to which the formula applies closer to the laboratory range, as compared to previous expressions, valid only for L=0 and complete spin polarization. We identify, and explain, two distinct regimes, separated by a critical density $n_c$. Below $n_c$, the per-particle exchange energy is lowered by the contribution of L=1, whereas above $n_c$ it is increased. As special cases of our general equation we recover various known, more limited, results for higher fields, and identify and correct a few inconsistencies in some of these earlier expressions.
description: 7 pages, 2 figures, PRB accepted
Structural analysis of the capsular polysaccharide of Escherichia coli K34 and studies of the glycanase activity of specific bacteriophage enzymes
Creators: name: Kuma-Mintah, Agyeman
Publisher: name: University of British Columbia
Year: 2010

description: To further the understanding of the chemical basis for serological differentiation, the structural investigation of capsular polysaccharides, produced by the various Escherichia coli (E. coli) strains has been embarked upon in this and other laboratories. The structural elucidation of E. coli K34 capsular polysaccharide and related studies are reported in this communication. N.m.r. spectroscopy and sugar analysis data on E. coli K34 capsular polysaccharide indicated that it consists of a pentasaccharide repeating unit with glucose, galactose and glucuronic acid as its sugar components. The nature of the anomeric linkages was established by ¹H-n.m.r. spectroscopy and confirmed by the results of oxidation of the fully acetylated polysaccharide with chromic acid. Methylation, periodate oxidation - Smith hydrolysis and uronic acid degradation studies on the capsular polysaccharide and on the carboxyl reduced polymer, of E. coli K34 show the structure to consist of a repeating unit, [See Thesis for Diagram] All the sugar residues in this capsular polysaccharide were assigned the D-configuration from circular dichroism measurements. The D configuration of the α-glucose was confirmed by treatment of E. coli K34 bacteriophage generated oligosaccharide with α-D-glucosidase. From the results of the cross-reaction between E. coli K34 and other group 09 E. coli strains (K28, K31, K32 and K33), we suggest that the immunodominant sugar of E. coli K34 capsular polysaccharide may either be 1 → 2 linked glucuronic acid or the terminal glucose. The occurrence of 1 → 2 linked glucuronic acid in E. coli K34 polysaccharide is the first to be reported in bacterial polysaccharide. In this study E. coli K34 and K31 capsular polysaccharides were depolymerized using their corresponding bacteriophages. Characterization of the bacteriophage generated oligosaccharides revealed that the E. coli K34 and K31 bacteriophage-borne glycanases are galactosidase and glucosidase respectively.
Theoretical and experimental studies on erythrocyte partition in aqueous polymer two phase systems
Creators: name: Sharp, Kim Andrew
Publisher: name: University of British Columbia
Year: 2010

description: Aaueous polymer two phase systems containing dextran T500, PEG 8000, and buffer are widely used to separate and analyse cells and other biological material based on the way they partition between the two phases and their interface. The behaviour of human erythrocytes in such two phase systems was studied in order to characterize some of the physico-chemical interactions important in determining cell partition. Two aspects were studied: the role of electrostatic and affinity ligand effects in determining the relative affinity of the cell for the two phases, and the relationship of this relative affinity to the cell partition. The potential difference produced by the unequal affinity of the buffer cations and anions for each phase was related to the salt partition by a thermodynamic model, which agreed with experimental results obtained in single and mixed salt systems. A thermodynamic theory for the effects of an affinity ligand on the cell surface free energy difference between the phases was derived, and found to agree quantitatively with experimental results using the affinity ligand PEG-palmitate. The change in cell surface free energy difference as a function of potential and ligand concentration was determined by contact angle measurements. This change was very small, based either on previous estimates of the surface charge density, or on the amount of PEG-palmitate bound to the cell surface as determined by adsorption experiments. This was attributed to partial exclusion of the phases from the cell glycocalyx. Cell partition into the upper PEG rich phase increased as this phase was made more positive with respect to the lower phase, or as the amount of an affinity ligand, PEG-palmitate, in the system was increased. Contact angle measurements were used to determine the energy of erythrocyte attachment to the interface between the two phases. The dependence of the cell partition on this parameter showed that thermal energies are far too small to partition cells in these systems. The cell partition was unaffected by the density difference between the phases. This and other results led to the hypothesis that droplet coalescence is the primary process by which large particles (>1 µm dia.) such as cells are distributed between the interface and one of the phases.
On statistical mechanics in noncommutative spaces
Creators: name: Alavi, S. A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the formulation of quantum statistical mechanics in noncommutative spaces. We construct microcanonical and canonical ensemble theory in noncommutative spaces. We consider for illustration some basic and important examples in the framework of noncommutative statistical mechanics : (i). An electron in a magnetic field. (ii). A free particle in a box. (iii). A linear harmonic oscillator.
description: 9 pages, no figures
Current-voltage curves for molecular junctions: the effect of substituents
Creators: name: Bauschlicher,, Charles W.
name: Lawson, John W.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present current-voltage (I-V) curves for phenylene ethynylene oligomers between two Au surfaces computed using a Density Functional Theory/Green's Function approach. In addition to the parent molecule, two different substituents are considered: one where all the hydrogens are replaced by chlorines and a second where one H is replaced by an NO2 group. In this way, we can study the difference between electron withdrawing and pi orbital effects. For low biases, a reduced current for the derived species is consistent with a shift of HOMO to lower energy due to the electron withdrawal by Cl or NO2. At higher biases, the LUMO becomes important, and the Cl and NO2 substituted species carry more current than the parent because the LUMO is stabilized (shifted to lower energy) due to the withdrawal of electrons by the Cl and NO2. In these molecules, the C2 bridging units as well as the thiol anchor group are shown to create bottlenecks to current flow.
In situ Ramsey Interferometry and Diffraction Echo with an Ultracold Fermi Gas
Creators: name: Marzok, C.
name: Deh, B.
name: Slama, S.
name: Zimmermann, C.
name: Courteille, Ph. W.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We report on the first observation of Bragg scattering of an ultracold $^6$Li Fermi gas. We demonstrate a Ramsey-type matter-wave interferometer based on Bragg diffraction and find robust signatures of persistent matter wave coherences using an echo pulse sequence. Because of the Pauli principle, the diffracted fermions oscillate nearly unperturbed in the trapping potential for long times beyond 2 s. This suggests extremely long coherence times. On these timescales, only the presence of a $^{87}$Rb cloud seems sufficient to induce noticeable perturbations.
description: 5 pages, 4 figures
Compound-specific isotope analysis
Creators: name: Lichtfouse, Eric
Publisher: name: arXiv
Year: 2007
Subjects: subject: Biomolecules (q-bio.BM)
subject: FOS: Biological sciences

description: The isotopic composition, for example, 14C/12C, 13C/12C, 2H/1H, 15N/14N and 18O/16O, of the elements of matter is heterogeneous. It is ruled by physical, chemical and biological mechanisms. Isotopes can be employed to follow the fate of mineral and organic compounds during biogeochemical transformations. The determination of the isotopic composition of organic substances occurring at trace level in very complex mixtures such as sediments, soils and blood, has been made possible during the last 20 years due to the rapid development of molecular level isotopic techniques. After a brief glance at pioneering studies revealing isotopic breakthroughs at the molecular and intramolecular levels, this paper reviews selected applications of compound-specific isotope analysis in various scientific fields.
Prompt High-Energy Emission from Proton-Dominated Gamma-Ray Bursts
Creators: name: Asano, Katsuaki
name: Inoue, Susumu
name: Mészáros, Peter
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The prompt emission of gamma-ray bursts (GRBs) is widely thought to be radiation from accelerated electrons, but an appreciably larger amount of energy could be carried by accelerated protons, particularly if GRBs are the sources of ultra-high-energy cosmic rays (UHECRs). We model the expected photon spectra for such "proton-dominated" GRBs in the internal shock scenario through Monte Carlo simulations, accounting for various processes related to high-energy electrons and protons. Besides proton and muon synchrotron components, emission from photomeson-induced secondary pair cascades becomes crucial, generally enhancing the GeV-TeV and/or eV-keV photons and offering a signature of UHE protons. In some cases, it can overwhelm the primary electron component and result in GRBs peaking in the 10 MeV - 1 GeV range, which may be relevant to some bursts discussed in a recent re-analysis of EGRET TASC data. The dependence of the spectra on key quantities such as the bulk Lorentz factor, magnetic field and proton-to-electron ratio is nontrivial due to the nonlinear nature of cascading and the interplay of electron- and proton-induced components. Observations by {\it Fermi}, ground-based telescopes and other facilities should test these expectations and provide critical constraints on the proton acceleration efficiency.
description: 16 pages, 6 figures
Nutritionally responsive disorders of companion animals
Creators: name: Nutritionally responsive disorders of companion animals
name: Abhishek Sharma1, Monika Karnani2, Sheela Choudhary3 and Manju4
Publisher: name: The Science world a Monthly e magazine
Year: 2023

description: Nutritionally responsive disorders are becoming increasingly common in companion animals, affecting their health and well-being. These disorders can range from obesity to nutrient deficiencies and can lead to a variety of health problems such as diabetes mellitus, skin infection, chronic kidney disease (CKD), Periodontal disease and joint problems etc. On the other hand, nutrient deficiencies can arise due to an imbalanced diet or a lack of essential nutrients. This can result in various health problems such as skin and coat issues, weakened immune systems, digestive problems and developmental abnormalities. Fortunately, these disorders are preventable through proper nutrition and lifestyle choices. Pet owners can ensure their pets receive a balanced diet that meets their nutritional needs by consulting with a veterinarian or animal nutritionist. Additionally, regular exercise and weight management can help prevent obesity and improve overall health. In conclusion, nutritionally responsive disorders are a growing concern for pet owners. By being mindful of their pet's diet and lifestyle, owners can help prevent these disorders and promote a happy and healthy life for their furry companions.
Rotation curve bifurcations as indicators of close recent galaxy encounters
Creators: name: Pedrosa, S.
name: Tissera, P. B.
name: Fuentes-Carrera, I.
name: de Oliveira, C. Mendes
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Rotation curves of interacting galaxies often show that velocities are either rising or falling in the direction of the companion galaxy. We seek to reproduce and analyse these features in the rotation curves of simulated equal-mass galaxies suffering a one-to-one encounter, as possible indicators of close encounters. Using simulations of major mergers in 3D, we study the time evolution of these asymmetries in a pair of galaxies, during the first passage. Our main results are: (a) the rotation curve asymmetries appear right at pericentre of the first passage, (b) the significant disturbed rotation velocities occur within a small time interval, of ~ 0.5 Gyr h^-1, and therefore the presence of bifurcation in the velocity curve could be used as an indicator of the pericentre occurrence. These results are in qualitative agreement with previous findings for minor mergers and fly-byes.
description: 4 pages, 7 figures
Observation of B^+ Meson Decays to a1(1260)^+ K^0 and B^0 to a1(1260)^- K^+
Creators: name: The BABAR Collaboration
name: Aubert, B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present branching fraction measurements of the decays B^{+} -> a1(1260)^{+} K^{0} and B^{0} to a1(1260)^{-} K^{+} with a1(1260)^{+} -> pi^{-} pi^{+} pi^{+}. The data sample corresponds to 383 million B B-bar pairs produced in e^{+}e^{-} annihilation through the Y(4S) resonance. We measure the products of the branching fractions: B(B^{+}-> a1(1260)^{+} K^{0})B(a1(1260)^{+} -> pi^{-} pi^{+} pi^{+}) = (17.4 +/- 2.5 +/- 2.2) 10^{-6} B(B^{0}-> a1(1260)^{-} K^{+})B(a1(1260)^{-} -> pi^{+} pi^{-} pi^{-}) = (8.2 +/- 1.5 +/- 1.2) 10^{-6}. We also measure the charge asymmetries A_{ch}(B^{+} -> a1(1260)^{+} K^{0})= 0.12 +/- 0.11 +/- 0.02 and A_{ch}(B^{0} -> a1(1260)^{-} K^{+})= -0.16 +/- 0.12 +/- 0.01. The first uncertainty quoted is statistical and the second is systematic.
description: 7 pages, 2 postscript figures. Submitted to Phys. Rev. Lett
A review of wildland fire spread modelling, 1990-present 2: Empirical and quasi-empirical models
Creators: name: Sullivan, A. L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Geophysics (physics.geo-ph)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: In recent years, advances in computational power and spatial data analysis (GIS, remote sensing, etc) have led to an increase in attempts to model the spread and behaviour of wildland fires across the landscape. This series of review papers endeavours to critically and comprehensively review all types of surface fire spread models developed since 1990. This paper reviews models of an empirical or quasi-empirical nature. These models are based solely on the statistical analysis of experimentally obtained data with or without some physical framework for the basis of the relations. Other papers in the series review models of a physical or quasi-physical nature, and mathematical analogues and simulation models. The main relations of empirical models are that of wind speed and fuel moisture content with rate of forward spread. Comparisons are made of the different functional relationships selected by various authors for these variables.
description: 22 pages + 7 pages references + 2 pages tables + 2 pages figures. Submitted to International Journal of Wildland Fire
Timescale effect estimation in time-series studies of air pollution and health: A Singular Spectrum Analysis approach
Creators: name: Bilancia, Massimo
name: Stea, Girolamo
Publisher: name: arXiv
Year: 2007
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences
subject: 62P12 (Primary) 62J99 (Secondary)

description: A wealth of epidemiological data suggests an association between mortality/morbidity from pulmonary and cardiovascular adverse events and air pollution, but uncertainty remains as to the extent implied by those associations although the abundance of the data. In this paper we describe an SSA (Singular Spectrum Analysis) based approach in order to decompose the time-series of particulate matter concentration into a set of exposure variables, each one representing a different timescale. We implement our methodology to investigate both acute and long-term effects of $PM_{10}$ exposure on morbidity from respiratory causes within the urban area of Bari, Italy.
description: Published in at http://dx.doi.org/10.1214/07-EJS123 the Electronic Journal of Statistics (http://www.i-journals.org/ejs/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Die Heimatarmee. Geschichte und Mythos der Armia Krajowa seit dem Zweiten Weltkrieg
Creators: name: Pohl, Dieter
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2005

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 54 Nr. 3 (2005)
Klaus Garber, Schatzhäuser des Geistes. Alte Bibliotheken und Büchersammlungen im Baltikum
Creators: name: Kreslins, Janis
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2009

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 58 Nr. 4 (2009)
Entstalinisierungskrise in Ostmitteleuropa 1953-1956. Vom 17. Juni bis zum ungarischen Volksaufstand. Politische, militärische, soziale und nationale Dimensionen
Creators: name: Connelly, John
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2002

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 51 Nr. 4 (2002)
Ruth Kibelka, Ostpreußens Schicksalsjahre 1944-1948.
Creators: name: Fisch, Bernhard
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2003

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 52 Nr. 3 (2003)
Grzegorz Hryciuk, Jarosław Stoćkyj, Studia nad demografią historyczną i sytuacją religijną Ukrainy
Creators: name: Golczewski, Frank
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2003

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 52 Nr. 4 (2003)
Signature of short distance physics on inflation power spectrum and CMB anisotropy
Creators: name: Das, Suratna
name: Mohanty, Subhendra
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The inflaton field responsible for inflation may not be a canonical fundamental scalar. It is possible that the inflaton is a composite of fermions or it may have a decay width. In these cases the standard procedure for calculating the power spectrum is not applicable and a new formalism needs to be developed to determine the effect of short range interactions of the inflaton on the power spectrum and the CMB anisotropy. We develop a general formalism for computing the power spectrum of curvature perturbations for such non-canonical cases by using the flat space Källén-Lehmann spectral function in curved quasi-de Sitter space assuming implicitly that the Bunch-Davis boundary conditions enforces the inflaton mode functions to be plane wave in the short wavelength limit and a complete set of mode functions exists in quasi-de Sitter space. It is observed that the inflaton with a decay width suppresses the power at large scale while a composite inflaton's power spectrum oscillates at large scales. These observations may be vindicated in the WMAP data and confirmed by future observations with PLANCK.
description: 17 pages, 4 figures, Extended journal version, Accepted for publication in JCAP
Black Hole Entropy Sourced by String Winding Condensate
Creators: name: Brustein, Ram
name: Zigdon, Yoav
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We calculate the entropy of an asymptotically Schwarzschild black hole (BH), using an effective field theory of winding modes in type II string theory. In Euclidean signature, the geometry of the BH contains a thermal cycle which shrinks towards the horizon. The light excitations thus include, in addition to the metric and the dilaton, also the winding modes around this cycle. The winding modes condense in the near-horizon region and source the geometry of the thermal cycle. Using the effective field theory action and standard thermodynamic relations, we show that the entropy, which is also sourced by the winding modes condensate, is exactly equal to the Bekenstein-Hawking entropy of the black hole. We then discuss some properties of the winding mode condensate and end with an application of our method to an asymptotically linear-dilaton black hole.
description: 21 pages. v2: added clarifications and acknowledgements
NMR studies of carbohydrates in the solid state
Creators: name: Lim, Tang Kuan
Publisher: name: University of British Columbia
Year: 2010

description: The work described herein entails the application of solid-state n.m.r. methods to both mono- and polysaccharide carbohydrates. Two major n.m.r. methods have been evaluated for studying these substances, namely, the carbon-13 cross-polarization-magic angle spinning method and the deuterium quadrupole echo method. Heptakis-(2,6-di-O-methyl)- β-cyclodextrin and β-cyclodextrin peracetate were prepared and, together with α-and β-cyclodextrins as hosts, were used to encage a variety of organic guest molecules. A number of metal sugar conjugates were prepared according to the procedures documented in this laboratory. Firstly, chelate coordination complexes were synthesized by forming salicylaldimine ligands derived from combinations of amino sugars (methyl 3,4,6-tri-O-acetyl-2-amino-2-deoxy-β-D-glucopyranoside or 1 , 3 , 4 , 6-tetra-O-acetyl-2-amino-2-deoxy-β-D-glucopyranose) and salicylaldehyde, with subsequent complexation of these to copper(II), zinc(ll), and cobalt(Il) ions. Similarly, chitosan Schiff's bases were prepared and complexed to copper(II) ion. Application of the ¹³C-cross-polarization-magic angle spinning method in the spectral assignment of cyclodextrin inclusion complexes and metal sugar conjugates in the solid state has been demonstrated. In all cases, recourse to solution spectra was necessary for correct assignments of individual carbon resonances. The sugar resonances of cyclodextrins are relatively broad and are complicated by the substantial splittings. The rationales for such observations were drawn from comparative studies, based on closely related guest molecules. The smaller guest molecules were least affected by the cavity size of the host molecule heptakis-( 2 , 6-di-O-methyl) -β-cyclodextr in and the isotropic chemical shift values were similar to those measured for solutions. These values suggest that the guest molecules undergo anisotropic motion, which can be detected by the use of the dipolar dephasing technique. Studies of metal sugar conjugates by ¹³C n.m.r. revealed that paramagnetic ions have profound effects on the resolution obtained. The high concentrations of these ions result in broad featureless spectra. On the other hand, the diamagnetic ions proved to have little effect on the isotropic chemical shifts of the sugar chelates. The deuterium quadrupole echo method has been used specifically to study the mobility of the guest molecules encaged in cyclodextrins. The "powder-type" spectra obtained were then compared with results reported in the literature in order to define the types of molecular motion.
Neural network enhanced hybrid quantum many-body dynamical distributions
Creators: name: Koch, Rouven
name: Lado, Jose L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Computing dynamical distributions in quantum many-body systems represents one of the paradigmatic open problems in theoretical condensed matter physics. Despite the existence of different techniques both in real-time and frequency space, computational limitations often dramatically constrain the physical regimes in which quantum many-body dynamics can be efficiently solved. Here we show that the combination of machine learning methods and complementary many-body tensor network techniques substantially decreases the computational cost of quantum many-body dynamics. We demonstrate that combining kernel polynomial techniques and real-time evolution, together with deep neural networks, allows to compute dynamical quantities faithfully. Focusing on many-body dynamical distributions, we show that this hybrid neural-network many-body algorithm, trained with single-particle data only, can efficiently extrapolate dynamics for many-body systems without prior knowledge. Importantly, this algorithm is shown to be substantially resilient to numerical noise, a feature of major importance when using this algorithm together with noisy many-body methods. Ultimately, our results provide a starting point towards neural-network powered algorithms to support a variety of quantum many-body dynamical methods, that could potentially solve computationally expensive many-body systems in a more efficient manner.
description: 11 pages, 7 figures
Sławomir Augusiewicz, Janusz Jasiński, Tadeusz Oracki, Bernhard H. Bayerlein, Wybitni Polacy w Królewcu. XVI-XX wiek
Creators: name: Ekdahl, Sven
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2009

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 58 Nr. 4 (2009)
Legenden aus dem Landeswehrkrieg: Vom "Wunder an der Düna" oder Als die Esten Riga befreiten
Creators: name: Brüggemann, Karsten
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2002

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 51 Nr. 4 (2002)
DRL-Assisted Resource Allocation for NOMA-MEC Offloading with Hybrid SIC
Creators: name: Li, Haodong
name: Fang, Fang
name: Ding, Zhiguo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Theory (cs.IT)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Multi-access edge computing (MEC) and non-orthogonal multiple access (NOMA) have been regarded as promising technologies to improve computation capability and offloading efficiency of the mobile devices in the sixth generation (6G) mobile system. This paper mainly focuses on the hybrid NOMA-MEC system, where multiple users are first grouped into pairs, and users in each pair offload their tasks simultaneously by NOMA, and then a dedicated time duration is scheduled to the more delay-tolerable user for uploading the remaining data by orthogonal multiple access (OMA). For the conventional NOMA uplink transmission, successive interference cancellation (SIC) is applied to decode the superposed signals successively according to the channel state information (CSI) or the quality of service (QoS) requirement. In this work, we integrate the hybrid SIC scheme which dynamically adapts the SIC decoding order among all NOMA groups. To solve the user grouping problem, a deep reinforcement learning (DRL) based algorithm is proposed to obtain a close-to-optimal user grouping policy. Moreover, we optimally minimize the offloading energy consumption by obtaining the closed-form solution to the resource allocation problem. Simulation results show that the proposed algorithm converges fast, and the NOMA-MEC scheme outperforms the existing orthogonal multiple access (OMA) scheme.
การพัฒนาครูด้านการทำวิจัยในชั้นเรียน : กรณีศึกษาโรงเรียนบ้านท่าสองคอนสำนักงานเขตพื้นที่การศึกษามหาสารคาม เขต 1
Creators: name: ปราโมทย์ วีรวรรณ
name: ภูษิต บุญทองเถิง
name: สมทรง สุวพานิช
name: จำเนียร พลหาญ
Publisher: name: มหาวิทยาลัยราชภัฏมหาสารคาม
Year: 2008
Subjects: ข้าราชการครู, การพัฒนาการทำวิจัยในชั้นเรียน

description: 1, 2, วารสารมหาวิทยาลัยราชภัฏมหาสารคามมนุษยศาสตร์และสังคมศาสตร์
Eridanus IV: an Ultra-Faint Dwarf Galaxy Candidate Discovered in the DECam Local Volume Exploration Survey
Creators: name: Cerny, W.
name: Pace, A. B.
name: Drlica-Wagner, A.
name: Koposov, S. E.
name: Vivas, A. K.
name: Mau, S.
name: Riley, A. H.
name: Bom, C. R.
name: Carlin, J. L.
name: Choi, Y.
name: Erkal, D.
name: Ferguson, P. S.
name: James, D. J.
name: Li, T. S.
name: Martínez-Delgado, D.
name: Martínez-Vázquez, C. E.
name: Munoz, R. R.
name: Mutlu-Pakdil, B.
name: Olsen, K. A. G.
name: Pieres, A.
name: Sakowska, J. D.
name: Sand, D. J.
name: Simon, J. D.
name: Smercina, A.
name: Stringfellow, G. S.
name: Tollerud, E. J.
name: Adamów, M.
name: Hernandez-Lang, D.
name: Kuropatkin, N.
name: Santana-Silva, L.
name: Tucker, D. L.
name: Zenteno, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the discovery of a candidate ultra-faint Milky Way satellite, Eridanus IV (DELVE J0505$-$0931), detected in photometric data from the DECam Local Volume Exploration survey (DELVE). Eridanus IV is a faint ($M_V = -4.7 \pm 0.2$), extended ($r_{1/2} = 75^{+16}_{-13}$ pc), and elliptical ($ε= 0.54 \pm 0.1$) system at a heliocentric distance of $76.7^{+4.0}_{-6.1}$ kpc, with a stellar population that is well-described by an old, metal-poor isochrone (age of $τ\sim 13.0$ Gyr and metallicity of ${\rm [Fe/H] \lesssim -2.1}$ dex). These properties are consistent with the known population of ultra-faint Milky Way satellite galaxies. Eridanus IV is also prominently detected using proper motion measurements from Gaia Early Data Release 3, with a systemic proper motion of $(μ_α \cos δ, μ_δ) = (+0.25 \pm 0.06, -0.10 \pm 0.05)$ mas yr$^{-1}$ measured from its horizontal branch and red giant branch member stars. We find that the spatial distribution of likely member stars hints at the possibility that the system is undergoing tidal disruption.
description: 9 pages, 4 figures (+1 page appendix); updated to match version published in ApJL
Phonon density of states, anharmonicity, electron-phonon coupling and possible multigap superconductivity in the clathrate superconductors Ba8Si46 and Ba24Si100: Why is Tc different in these two compounds?
Creators: name: Lortz, Rolf
name: Viennois, Romain
name: Petrovic, Alexander
name: Wang, Yuxing
name: Toulemonde, Pierre
name: Meingast, Christoph
name: Koza, Michael Marek
name: Mutka, Hannu
name: Bossak, Alexei
name: Miguel, Alfonso San
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We report a detailed study of specific heat, electrical resistivity and thermal expansion in combination with inelastic neutron and inelastic X-ray scattering to investigate the origin of superconductivity in the two silicon clathrate superconductors Ba8Si46 and Ba24Si100. Both compounds have a similar structure based on encaged barium atoms in oversized silicon cages. However, the transition temperatures are rather different: 8 K and 1.5 K respectively. By extracting the superconducting properties, phonon density of states, electron-phonon coupling function and phonon anharmonicity from these measurements we discuss the important factors governing Tc and explain the difference between the two compounds.
description: 31 pages, 2 tables, 12 figures
Automatic generation of vertices for the Schroedinger functional
Creators: name: Takeda, Shinji
name: Wolff, Ulli
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We present a multiplication algorithm to recursively construct vertices for the Schroedinger functional in the abelian background field case. The algorithm is suited for automatic perturbative calculations with a variety of actions. As first applications, we derive ratios of the lambda parameters between the lattice scheme (improved gauge actions including six link loops) and the $\bar{\rm MS}$ scheme, and one-loop results for the Schroedinger functional coupling with a lattice $T=L \pm a$, which is motivated by considering staggered fermions.
description: 7 pages, 2 figures, 1 table, contribution to Lattice 2007, Regensburg, Germany
Bulk photovoltaic effect in BaTiO$_3$-based ferroelectric oxides: An experimental and theoretical study
Creators: name: Pal, Subhajit
name: Muthukrishnan, S.
name: Sadhukhan, Banasree
name: N., Sarath
name: Murali, D.
name: Murugavel, Pattukkannu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The bulk photovoltaic effect exhibited by the non-centrosymmetric system gains research interest due to the observed large open-circuit voltage. The ferroelectric systems exhibiting anomalous photovoltaic effect are mostly crystallized with multiphase coexistence. Hence, the computational difficulty in building a multi-phase system restricts the detailed photovoltaic studies through phenomenological and shift current theory. In this work, ferroelectric Ba$_{1- x}$(Bi$_{0.5}$K$_{0.5}$)$_x$TiO$_3$ (BBKT) oxide is designed to crystallize in single-phase tetragonal symmetry with improved polarization characteristics, and it is found to exhibits large PV response. Both experimental and theoretical studies on BBKT samples reveal ~18% reduction in bandgap compared to the parent BaTiO$_3$. Short-circuit current measured as a function of light intensity and light polarization angle reveal linear and sinusoidal response, respectively. The observed features are in accordance with phenomenological theory. Remarkably, x = 0.125 sample displays ~8 times higher open-circuit voltage (7.39 V) than the parent compound. The enhanced PV effect is attributed to the large shift current along z-direction as evidenced from the additional charge-center shift of valence band occupied by O-2p orbital and conduction band occupied by Bi-6p orbital. Notably, the degenerate Bi-p$_z$ state at conduction band minimum in BBKT favours the large shift current response in the z-direction.
Das Preußenland als Forschungsaufgabe. Eine europäische Region in ihren geschichtlichen Bezügen.
Creators: name: Löwener, Marc
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2003

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 52 Nr. 3 (2003)
Teresa Andlauer, Die jüdische Bevölkerung im Modernisierungsprozess Galiziens (1867-1914)
Creators: name: Struve, Kai
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2003

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 52 Nr. 1 (2003)
A review of wildland fire spread modelling, 1990-present 3: Mathematical analogues and simulation models
Creators: name: Sullivan, A. L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Geophysics (physics.geo-ph)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: In recent years, advances in computational power and spatial data analysis (GIS, remote sensing, etc) have led to an increase in attempts to model the spread and behvaiour of wildland fires across the landscape. This series of review papers endeavours to critically and comprehensively review all types of surface fire spread models developed since 1990. This paper reviews models of a simulation or mathematical analogue nature. Most simulation models are implementations of existing empirical or quasi-empirical models and their primary function is to convert these generally one dimensional models to two dimensions and then propagate a fire perimeter across a modelled landscape. Mathematical analogue models are those that are based on some mathematical conceit (rather than a physical representation of fire spread) that coincidentally simulates the spread of fire. Other papers in the series review models of an physical or quasi-physical nature and empirical or quasi-empirical nature. Many models are extensions or refinements of models developed before 1990. Where this is the case, these models are also discussed but much less comprehensively.
description: 20 pages + 9 pages references + 1 page figures. Submitted to the International Journal of Wildland Fire
Die Destruktion des Dialogs. Zur innenpolitischen Instrumentalisierung negativer Fremdbilder und Feindbilder. Polen, Tschechien, Deutschland und die Niederlande im Vergleich, 1900 bis 2005
Creators: name: Schaller, Helmut W.
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2009

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 58 Nr. 4 (2009)
Magnetic Reconnection within the Boundary Layer of a Magnetic Cloud in the Solar Wind
Creators: name: Vörös, Zoltán
name: Varsani, Ali
name: Yordanova, Emiliya
name: Sasunov, Yury L.
name: Roberts, Owen W.
name: Kis, Arpád
name: Nakamura, Rumi
name: Narita, Yasuhito
Publisher: name: arXiv
Year: 2021
Subjects: subject: Space Physics (physics.space-ph)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The twisted local magnetic field at the front or rear regions of the magnetic clouds (MCs) associated with interplanetary coronal mass ejections (ICMEs) is often nearly opposite to the direction of the ambient interplanetary magnetic field (IMF). There is also observational evidence for magnetic reconnection (MR) outflows occurring within the boundary layers of MCs. In this paper a MR event located at the western flank of the MC occurring on 2000-10-03 is studied in detail. Both the large-scale geometry of the helical MC and the MR outflow structure are scrutinized in a detailed multi-point study. The ICME sheath is of hybrid propagation-expansion type. Here the freshly reconnected open field lines are expected to slip slowly over the MC resulting in plasma mixing at the same time. As for MR, the current sheet geometry and the vertical motion of the outflow channel between ACE-Geotail-WIND spacecraft was carefully studied and tested. The main findings on MR include: (1) First-time observation of non-Petschek-type slow-shock-like discontinuities in the inflow regions; (2) Observation of turbulent Hall magnetic field associated with a Lorentz force deflected electron jet; (3) Acceleration of protons by reconnection electric field and their back-scatter from the slow shock-like discontinuity; (4) Observation of relativistic electron near the MC inflow boundary/separatrix; these electron populations can presumably appear as a result of non-adiabatic acceleration, gradient B drift and via acceleration in the electrostatic potential well associated with the Hall current system; (5) Observation of Doppler shifted ion-acoustic and Langmuir waves in the MC inflow region.
description: 43 pages, 10 figures, accepted in J. Geophys. Res. - Space Phys
Weltkriegserlebnis an der galizisch-polnischen Ostfront 1914/15. Zur Wahrnehmung des Ostens in Feldpostbriefen des Ostforschers Hermann Aubin
Creators: name: Mühle, Eduard
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2002

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 51 Nr. 4 (2002)
Karoli IV imperatoris Romanorum Vita de eo ipso conscripta et Hystoria Nova de Sancto Wenceslao Martyre. Autobiography of Emperor Charles IV and Legend of St. Wenceslas
Creators: name: Kersken, Norbert
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2003

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 52 Nr. 4 (2003)
การพัฒนาการรับรู้ความสามารถของตนเองและการควบคุมตนเองเพื่อหลีกเลี่ยงการใช้สารเสพติดของเยาวชน
Creators: name: วราภรณ์ กุประดิษฐ์
name: นีออน พิณประดิษฐ์
name: ศรินทิพย์ รักษาสัตย
Publisher: name: มหาวิทยาลัยราชภัฏมหาสารคาม
Year: 2008
Subjects: การรับรู้ความสามารถของตนเอง, การควบคุมตนเอง, และพฤติกรรมหลีกเลี่ยงการใช้สารเสพติด

description: 2, 2, วารสารมหาวิทยาลัยราชภัฏมหาสารคามมนุษยศาสตร์และสังคมศาสตร์
Two-phonon assisted exciton spin relaxation due to exchange interaction in spherical quantum dots
Creators: name: Nahálková, P.
name: Sprinzl, D.
name: Malý, P.
name: Němec, P.
name: Gladilin, V. N.
name: Devreese, J. T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Spin relaxation in undoped quasi-spherical CdS quantum dots at zero magnetic fields is investigated using time- and polarization-resolved transient absorption measurements. Unlike in previous studies of these systems, the measured signals were corrected for spin-insensitive contributions to the exciton bleaching dynamics, {allowing us to determine} the pure spin-related exciton dynamics. To explain the observed room-temperature spin-relaxation time of several nanoseconds, we propose a novel mechanism based on intralevel exciton transitions with the emission of one LO phonon, the absorption of another LO phonon, and an electron spin flip, which is driven by the electron-hole exchange interaction. The transition rates, calculated in the present work for different sizes of quantum dots and temperatures, are in fair agreement with our experimental results.
description: 5 pages, 2 figures
Muonium in some insulating oxides and diamond
Creators: name: Spencer, David Philip
Publisher: name: University of British Columbia
Year: 2010

description: Muonium can be regarded as an isotopic analogue of the hydrogen atom, with a positive muon replacing the proton. This thesis is concerned with searches for muonium in weak transverse and zero magnetic fields in a variety of non-magnetic oxide insulators with few nuclear moments, and in diamond, a semiconductor. The technique of Muon Spin Rotation (µSR) was used, which can be thought of in analogy with NMR and EPR. It relies on measuring the direction of the muon spin with time via the unique signature of the parity violating decay of the muon, in which its decay positron is emitted preferentially along the muon spin direction. This can provide a sensitive measure of the interaction of the muon spin with its environment. Muonium has been searched for successfully in ɑ-quartz, fused quartz., hexagonal and fused germanium dioxide, magnesium oxide, and diamond; and unsuccessfully in tetragonal germanium dioxide, rutile, strontium titanate, zircon, and beryl. All the samples save the quartzes showed a large "missing fraction"; that is, not all the initial muon polarization could be accounted for. This indicates that muonium was formed but rapidly depolarized. The missing fractions were found to be very strongly temperature dependent in strontium titanate but only weakly in rutile. At room temperature, the observed muonium fractions were: ɑ-quartz and fused quartz (65±5)%, hexagonal germanium dioxide <2%, fused germanium dioxide (10±4)%, magnesium oxide (30±10)%, and diamond (33± 4)%. It is noteworthy that the fractions are very different in quartz and germanium dioxide, despite their structural analogy. The observation of muonium in diamond represents the first time that muonium has been seen in a room temperature semiconductor. A spin-Hamiltonian new to µSR was found in low-temperature ɑ-quartz and hexagonal germanium dioxide, in which the hyperfine interaction is completely anisotropic. In low-temperature ɑ-quartz in zero magnetic field this interaction gives rise to three signals whose frequencies are orientation independent, but whose amplitudes are strongly orientation dependent By studying the orientation dependence it was determined that muonium occupies a site which is identical with that seen for hydrogen in EPR studies. This was the first time that muonium was shown to behave just like an isotope of hydrogen in a solid. In hexagonal GeO₂, eight frequencies were observed at 6K, in marked contrast to the observation of only three frequencies in structurally analogous ɑ-quartz. The interpretation of this is that there are three or four different sites, the exact nature of which has not been determined.
Orbital Degeneracy and the Microscopic Model of the FeAs Plane in the Iron-Based Superconductors
Creators: name: Li, Tao
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A microscopic model for the FeAs plane in the newly discovered Iron-based superconductors is proposed with the emphasis on the role of the orbital degeneracy between the Fe $3d_{xz}$ and $3d_{yz}$ orbital in the crystal field environment. The model predicts commensurate antiferromagnetic ordered ground state for the parent compounds and a d-wave superconducting ground state at finite doping. Inter-orbital couplings plays an interesting role in enhancing both orders. Correlated variational wave functions are proposed for both ordered phases.
description: 4 pages, 3 figures
A multi-line study of the filamentary infrared dark cloud G351.78-0.54
Creators: name: Ryabukhina, O. L.
name: Zinchenko, I. I.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present results of a multi-line study of the filamentary infrared dark cloud G351.78-0.54 in the 1.3 and 0.8 mm wavelength bands. The lines of the three isotopologues of carbon monoxide CO, N$_2$H$^+$, CH$_3$CCH and HNCO were observed. The aim was to study the general structure of the filamentary cloud, its fragmentation and physical parameters with the emphasis on properties of dense clumps in this cloud. Several dense clumps are identified from the N$_2$H$^+$ (3-2) data, their masses and virial parameters are determined using the C$^{18}$O (2-1) line. Temperatures of some clumps are estimated from the CH$_3$CCH and HNCO data. Almost all clumps appear to be gravitationally unstable. The density estimates obtained from the C$^{18}$O (3-2)/(2-1) and N$_2$H$^+$ (3-2)/(1-0) intensity ratios are in the range $n \sim (0.3-3)\times 10^5$ cm$^{-2}$. The HNCO emission is detected exclusively toward the first clump which contains the luminous IR source IRAS 17233-3606, and indicates an even higher density. It is observed in the outflow, too. The velocity shift of the higher excitation HNCO lines may indicate a movement of the hot core relative the surrounding medium. In some clumps there is a velocity shift $\sim 1$ km s$^{-1}$ between N$_2$H$^+$ (3-2) and CO isotopologues. The large widths of the N$_2$H$^+$ (3-2) line in the clumps indicate an increase of the velocity dispersion in their dense interiors, which may be related to the star formation process. The N$_2$H$^+$ abundance drops toward the luminous IR source.
description: 12 pages, 15 figures, accepted for publication in MNRAS
Exorcizing the Landau Ghost in Non Commutative Quantum Field Theory
Creators: name: Gurau, Razvan
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We show that the simplest non commutative renormalizable field theory, the $ϕ^4$ model on four dimensional Moyal space with harmonic potential is asymptotically safe to all orders in perturbation theory
Tylko dialog? Polsko-niemieckie rozmowy o wspólnej historii. Dialog oder mehr? Deutsch-polnische Gespräche über die gemeinsame Geschichte.
Creators: name: Schattkowsky, Ralph
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2003

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 52 Nr. 3 (2003)