cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Photoionization of aligned excited states in neon by attosecond laser pulses
Creators: name: Omiste, Juan J.
name: Madsen, Lars Bojer
Publisher: name: arXiv
Year: 2020
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We describe numerically the ionization process induced by linearly and circularly polarized XUV attosecond laser pulses on an aligned atomic target, specifically, the excited state Ne$^*(1s^22s^22p^5[{}^2\text{P}^\text{o}_{1/2}]3s[^1\text{P}^o])$. We compute the excited atomic state by applying the time-dependent restricted-active-space self-consistent field (TD-RASSCF) method to fully account for the electronic correlation. We find that correlation-assisted ionization channels can dominate over channels accessible without correlation. We also observe that the rotation of the photoelectron momentum distribution by circularly polarized laser pulses compared to the case of linear polarization can be explained in terms of differences in accessible ionization channels. This study shows that it is essential to include electron correlation effects to obtain an accurate description of the photoelectron emission dynamics from aligned excited states.
description: 10 figures, 11 pages (minor changes with respect to previous version)
Pre-Symmetry Sets of 3D shapes
Creators: name: Diatta, Andre
name: Giblin, Peter J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53A05; 53A55; 34C23; 68U05; 14Q10; 51N05; 65D17; 34C14

description: The investigation of 3D euclidean symmetry sets (SS) and medial axis is an important area, due in particular to their various important applications. The pre-symmetry set of a surface M in 3-space (resp. smooth closed curve in 2D) is the set of pairs of points which contribute to the symmetry set, that is, the closure of the set of pairs of distinct points p and q in M, for which there exists a sphere (resp. a circle) tangent to M at p and at q. The aim of this paper is to address problems related to the smoothness and the singularities of the pre-symmetry sets of 3D shapes. We show that the pre-symmetry set of a smooth surface in 3-space has locally the structure of the graph of a function from R^2 to R^2, in many cases of interest.
description: ACM-class: I.2; I.5; I.4; J.2. Latex, 3 grouped figures. The final version will appear in the proceedings of the First International Workshop on Deep Structure, Singularities and Computer Vision, Maastricht June 2005
Recommended procedure for the IR spectroscopic determination of water in soda-lime-silica glass : Report of the International Commission on Glass (ICG) Technical Committee 14 "Gases in Glass"
Creators: name: Geotti-Bianchini, Franco
name: Geißler, Heinz
name: Krämer, Fritz
name: Smith, Ian H.
Publisher: name: Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft
Year: 1999
Subjects: subject: 660

description: The paper illustrates a procedure recommended by Technical Committee 14 (TC14 "Gases in Glass") of the International Commission on Glass (ICG) for the determination of the water content of soda-lime-silica glass by infrared transmittance spectroscopy, based on the two bands at 2.8 and 3.6 μm using as extincdon coefficients 70 and 150 l/(mol · cm), respectively As shown by the result of two intercomparisons, the agreement on the determined water concentration values can be quite satisfactory, within ±20 ppm, provided the procedure to evaluate the spectral curves is closely specified. The selected extinction coefficients are in reasonable agreement with recent evidence obtained using Nuclear Reaction Analysis.
On the robustness of bound states in the continuum in waveguides with lateral leakage channels
Creators: name: Yuan, Lijun
name: Lu, Ya Yan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Bound states in the continuum (BICs) are trapped or guided modes with frequencies in radiation continua. They are associated with high-quality-factor resonances that give rise to strong local field enhancement and rapid variations in scattering spectra, and have found many valuable applications. A guided mode of an optical waveguide can also be a BIC, if there is a lateral structure supporting compatible waves propagating in the lateral direction, i.e., there is a channel for lateral leakage. A BIC is typically destroyed (becomes a resonant or a leaky mode) if the structure is slightly perturbed, but some BICs are robust with respect to a large family of perturbations. In this paper, we show (analytically and numerically) that a typical BIC in optical waveguides with a left-right mirror symmetry and a single lateral leakage channel is robust with respect to any structural perturbation that preserves the left-right mirror symmetry. Our study improves the theoretical understanding on BICs and can be useful when applications of BICs in optical waveguides are explored.
description: 10 pages, 4 figures
Earthquake Hazard Mitigation of Transportation Facilities
Creators: name: Allen, David L.
name: Drnevich, Vincent P.
name: Sayyedsadr, Mostafa
name: Fleckenstein, L. John
Publisher: name: Kentucky Transportation Center, University of Kentucky
Year: 1988
Subjects: subject: Transportation Engineering

description: Concern has grown in recent years, over the seismic activity of the New Madrid seismic zone located in the central United States. Western Kentucky is located in this region. To permit emergency medical, supply, and equipment traffic into this area after an earthquake has occurred, the Kentucky Transportation Cabinet is interested in the possibility of keeping selected routes passable. This report lists the routes that have been investigated and recommended as being routes that should be maintained in passable conditions. These recommended routes have been visually surveyed and all seismically significant features cataloged. These features are listed in the Appendix. In addition, a discussion on retrofitting bridges for seismic safety is included. A number of general recommendations are made concerning "hardening" the transportation system against earthquakes.
Path Deviation Equations in AP-Geometry
Creators: name: Wanas, M. I.
name: Kahil, M. E.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Differential Geometry (math.DG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Recently, it has been shown that Absolute Parallelism (AP) geometry admits paths that are naturally quantized. These paths have been used to describe the motion of spinning particles in a background gravitational field. In case of a weak static gravitational field limits, the paths are applied successfully to interpret the discrepancy in the motion of thermal neutrons in the Earth's gravitational field (COW-experiment). The aim of the present work is to explore the properties of the deviation equations corresponding to these paths. In the present work the deviation equations are derived and compared to the geodesic deviation equation of the Riemannian geometry.
description: LaTeX file, 6 pages
Evaluation of Stability and Rutting Potential of Asphaltic Concrete Using Big-Stone Gradations
Creators: name: Allen, David L.
name: Roghani, Hossien
Publisher: name: Kentucky Transportation Center, University of Kentucky
Year: 1988
Subjects: subject: Transportation Engineering

description: Considerable interest has been generated in recent years in using big stone gradations to reduce rutting and shoving in asphaltic concrete. This report documents mix design procedures and a laboratory testing program to determine the stability and rutting potential of a big-stone gradation. A series of creep tests was performed on a big-stone gradation and the results were compared to creep tests performed on a Class I base mixture. The big-stone mix average approximately 50 percent rutting potential as compared to the Class I base. One creep specimen of the big-stone mixture was compacted using polymer-modified AC-20 grade asphalt cement. This specimen performed with less strain than the big-stone specimens compacted with an unmodified AC-20 asphalt cement (at loading times greater than 4000 seconds. One specimen was compacted using an AC-40 asphalt cement. This specimen failed at a short loading time (approximately 1000 seconds), indicating a brittle mixture.
Process prototyping - Physical model of the glass pressing process
Creators: name: Trossin, Hans-Jürgen
Publisher: name: Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft
Year: 1999
Subjects: subject: 660

description: Α physical model of the glass pressing process has been developed based on the theory of dimensional analysis. The main objective of this approach was to set up an equivalent model process operating on a significantly lower temperature level than the original pressing process. Therefore a model glass had to be found that showed the same thermoviscous behavior as the glass used in the original production. It is proved mathematically that at least one type of nitrate glass matches these requirements. Initially, the process under examination had to be described dimensionlessly. Starting from this dimensionless base, scale equations could be derived according to the model laws of dimensional analysis. Besides, the dimensionless mathematical treatment of the thermoviscous material properties of glass revealed more common grounds among different types and compositions of glasses than expected. In the following paper the fundamental principles and boundary conditions related to the problem of physically modehng a real glass forming process are discussed.
Creation and analysis of protein tyrosine phosphatase epsilon mutant mice
Creators: name: Pownall, Scott
Publisher: name: University of British Columbia
Year: 2009

description: Addition and removal of phosphate from tyrosyl residues of proteins is an important mechanism for regulating the function and localization of proteins within the cell. Protein tyrosine phosphatases (PTP) are the family of enzymes that function to remove the phosphate specifically from phosphotyrosyl containing proteins. Protein tyrosine phosphatases act in concert with protein tyrosine kinases to provide intricate mechanisms for the regulation of cellular functions such as proliferation, differentiation, cell adhesion, and metabolism. This thesis revolves around the genetic analysis of protein tyrosine phosphatase-epsilon. This PTP exists as two isoforms - a transmembrane-containing receptor-like PTP having a small extracellular domain linked to two tandem phosphatase domains via a transmembrane segment, and an intracellular form containing a unique N-terminus attached to the two tandem phosphatase domains. The juxtamembrane region of the receptor-like form is common with the intracellular form and is defined as two exons in the mouse genome. Through the deletion of the transmembrane and first juxtamembrane exons of the Ptpre gene in mouse R1 embryonic stem cells using homologous recombination followed by Cre mediated excision of LoxP flanked exons we have generated mice mutant for these two forms of PTP-epsilon. The objectives of this thesis is to determine the functional role of the isoforms of protein tyrosine phosphatase epsilon (PTP-ε) through loss-of-function analysis in the mouse, and to test the hypothesis that murine PTP-ε is required for embryonic development and to determine if the gene product is required for reproduction. A further aim is to examine redundancy issues between the highly related protein tyrosine phosphatases, PTP-ε and RPTP-α. PtpreΔ/PtpreΔ mutant mice are viable and fertile. Gross anatomy and histological analysis of homozygous mutant mice shows no difference from wildtype. Protein tyrosine phosphatase-epsilon shows the strongest amino acid similarity to the receptor-like PTP-alpha. The high degree of similarity between these two molecules suggest that functional redundancy may occur. In collaboration with Dr. Jan Sap (NYU) we crossed the PtpraΔ/PtpraΔ mutant mouse to the PtpreΔ/PtpreΔ mutant mouse to create double knockout mice. Preliminary studies indicate that these mutant mice are viable, fertile and exhibit no apparent difference from wildtype with respect to behavior. Identification of subtle phenotypes in the laboratory context can be difficult, as important function of genes may not reveal themselves without the appropriate stresses or environment. This implies that a phenotype resulting from a particular gene knockout is present but may not be detectable by conventional methods.
Soil-Bridge Abutment Interaction
Creators: name: Meade, Bobby W.
name: Allen, David L.
Publisher: name: Kentucky Transportation Center, University of Kentucky
Year: 1988
Subjects: Transportation Engineering

description: Presented herein are analyses of 6 bridge approaches. Lateral movement and settlement of the foundations and embankments are discussed. Result·s of slope stability and finite element analyses are related to measured movements. A graph for predicting approach pavement settlement is included. A theoretical approach model was used to run an extensive series of finite element analyses. Movements resulting from these analyses are presented with several variable model conditions. Variable conditions include embankment and foundation configuration, soil cohesion, and soil friction angle.
Coulomb corrections to two-particle interaction in artificial traps
Creators: name: Guo, Peng
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In present work, we discuss the effect of Coulomb interaction to the dynamics of two-particle system bound in various traps. The strategy of including Coulomb interaction into the quantization condition of trapped system is discussed in a general and non-perturbative manner. In most cases, Coulomb corrections to quantization condition largely rely on numerical approach or perturbation expansion. Only for some special cases, such as the spherical hard wall trap, a closed-form of quantization condition with all orders of Coulomb corrections can be obtained.
description: Title changed to Coulomb corrections to two-particle interaction in artificial traps, minor changes in text to match published version
Impact of furnace atmosphere and organic contamination of recycled cullet on redox State and fining of glass melts
Creators: name: Beerkens, Ruud G. C.
name: Zaman, Laurens
name: Laimböck, Paul
name: Kobayashi, Sho
Publisher: name: Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft
Year: 1999
Subjects: subject: 660

description: The onset temperature of fming and the quantity of fming gases is not only determined by the amount of fming agents in sodalime- silica batches, but also by the level of organic contaminants in the cullet or normal batch and the water vapor pressure in the furnace atmosphere. These conditions will also determine the redox State of the glass and residual sulfate or sulfide concentrations in the glass. Organic contaminants will form char during headng of the batch. This char partly reacts with CO₂ Coming from the decomposition of the soda, limestone or dolomite forming carbon monoxide. Stable types of char or cokes or cuUet-rich batches with only small amounts of carbonates will result in some carbon residues after the CO₂ evolution. This carbon partly reduces Sulfates and ferric iron in the fresh melts. This results in sulfide and ferrous iron formation in these glass melts. At increasing temperatures in the melt, the sulfides and Sulfates react together forming sulfur-containing gases between 1000 to 1250°C. The Sulfate retention decreases, finally the glass even may contain sulfur only in the sulfide form under very reduced conditions. In batches without reducing agents, Sulfates in the melt Start to decompose at temperatures exceeding 1400 °C. Small amounts of carbon and water vapor reduce the fining onset temperature. Water vapor from the furnace atmosphere predominantly Infiltrates the batch blanket during melting and foaming. The water will enhance the bubble and seed growth during fining. Water in the melt will influence the redox State of the final glass. Only in batches containing coarse raw materials or cullet, reducing or oxidizing gases from the furnace atmosphere Infiltrate the batch blanket and these gases will respectively reduce and oxidize components like iron oxides, sulfate/sulfide or chromium oxides in the batch blanket interior.
allie-burns/2021_Silva_NatureNeuroscience: Code Repository Release for Silva et al., 2021, Nature Neuroscience
Creators: name: Burns, Allison M.
name: Heuvel, Lukas Van Den
name: Silva, Bianca A.
Publisher: name: Zenodo
Year: 2021

description: Publication of the code used for the analysis found in Silva et al., 2021, Nature Neuroscience.
Rapid and Robust Parameter Inference for Binary Mergers
Creators: name: Cornish, Neil J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The detection rate for compact binary mergers has grown as the sensitivity of the global network of ground based gravitational wave detectors has improved, now reaching the stage where robust automation of the analyses is essential. Automated low-latency algorithms have been developed that send out alerts when candidate signals are detected. The alerts include sky maps to facilitate electromagnetic follow up observations, along with probabilities that the system might contain a neutron star, and hence be more likely to generate an electromagnetic counterpart. Data quality issues, such as loud noise transients (glitches), can adversely affect the low-latency algorithms, causing false alarms and throwing off parameter estimation. Here a new analysis method is presented that is robust against glitches, and capable of producing fully Bayesian parameter inference, including sky maps and mass estimates, in a matter of minutes. Key elements of the method are wavelet-based de-noising, penalized maximization of the likelihood during the initial search, rapid sky localization using pre-computed inner products, and heterodyned likelihoods for full Bayesian inference.
description: 13 pages, 11 figures
Influence of water dissolved in the structure of soda-lime-silica glass on melting, forming and properties: state-of-the-art and controversial issues Report of the International Commission on Glass (ICG) Technical Committee 14 "Gases in Glass"
Creators: name: Geotti-Bianchini, Franco
name: Brown, John T.
name: Faber, Anne J.
name: Hessenkemper, Heiko
name: Kobayashi, Sho
name: Smith, Ian H.
Publisher: name: Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft
Year: 1999
Subjects: subject: 660

description: The paper summarizes the information available about the water content of soda-lime-silica glass, the factors that influence it and the influence exerted by water in glass on redox and sulphur retention, on fming, on the melting and forming behaviour, workability and the physical and chemical properties of the melt. Such issues were discussed by the authors in their presentations at the first Forum on Water in Glass, organized in 1997 by Technical Committee 14 (TC 14 "Gases in Glass") of the International Commission on Glass (ICG). The present paper reports the conclusions of the final discussion, highlighting the issues on which consensus was reached (IR spectroscopy is suitable to monitor the water content; the water content of conventionally fired Containers is 300 to 400 ppm and daily oscillations are moderate; water, redox and sulphur interact mutually; water lowers the viscosity; the influence of water content variations on the radiative thermal conductivity is moderate) and the still controversial issues (influence of water and hydroxides in the batch on the final water content; influence of water in the batch and atmosphere on the redox State of the glass; influence of oscillations of OH level on the workability; influence of OH level on ease of forming, product quahty and strength).
Glassy behavior of molecular crystals: A comparison between results from MD-simulation and mode coupling theory
Creators: name: Ricker, M.
name: Affouard, F.
name: Schilling, R.
name: Descamps, M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We have investigated the glassy behavior of a molecular crystal built up with chloroadamantane molecules. For a simple model of this molecule and a rigid fcc lattice a MD simulation was performed from which we obtained the dynamical orientational correlators $S_{λλ'}({\bf{q}},t)$ and the ``self'' correlators $S_{λλ'}^{(s)}(t)$, with $λ= (\ell, m)$, $λ' = (\ell', m')$. Our investigations are for the diagonal correlators $λ= λ'$. Since the lattice constant decreases with decreasing temperature which leads to an increase of the steric hindrance of the molecules, we find a strong slowing down of the relaxation. It has a high sensitivity on $λ$, $λ'$. For most $(\ell,m)$, there is a two-step relaxation process, but practically not for $(\ell,m) = (2,1)$, $(3,2)$, $(4,1)$ and $(4,3)$. Our results are consistent with the $α$-relaxation scaling laws predicted by mode coupling theory from which we deduce the glass transition temperature $T_c^{MD} \cong 217K$. From a first principle solution of the mode coupling equations we find $T_c^{MCT} \cong 267K$. Furthermore mode coupling theory reproduces the absence of a two-step relaxation process for $(\ell,m)=(2,1)$, $(3,2)$, $(4,1)$ and $(4,3)$, but underestimates the critical nonergodicity parameters by about 50 per cent for all other $(\ell,m)$. It is suggested that this underestimation originates from the anisotropic crystal field which is not accounted for by mode coupling theory. Our results also imply that phonons have no essential influence on the long time relaxation.
Redox behavior of iron and vanadium ions in Silicate melts at temperatures up to 2000 °C
Creators: name: Leister, Michael
name: Ehrt, Doris
Publisher: name: Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft
Year: 1999
Subjects: subject: 660

description: Two glasses 33Na₂O · 67SiO₂ and 15Na₂O · 85SiO₂ (composition in mol%), doped with Fe₂O₃ and V₂O₅, respectively, were melted under various conditions in the temperature ränge of 1400 to 2000 °C. The redox states in the quenched glasses were investigated by optical absorption spectroscopy. Investigations concerning the redox equilibrium of the polyvalent ions in the glass melts were carried out using square-wave voltammetry. The results of both methods were compared. Furthermore equilibrium experiments were carried out to show the time dependence of redox equilibrium reached.
Ab initio study of transport properties in defected carbon nanotubes: an O(N) approach
Creators: name: Biel, Blanca
name: Garcia-Vidal, F. J.
name: Rubio, Angel
name: Flores, Fernando
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A combination of ab initio simulations and linear-scaling Green's functions techniques is used to analyze the transport properties of long (up to one micron) carbon nanotubes with realistic disorder. The energetics and the influence of single defects (mono- and di-vacancies) on the electronic and transport properties of single-walled armchair carbon nanotubes are analyzed as a function of the tube diameter by means of the local orbital first-principles Fireball code. Efficient O(N) Green's functions techniques framed within the Landauer-Buttiker formalism allow a statistical study of the nanotube conductance averaged over a large sample of defected tubes and thus extraction of the nanotubes localization length. Both the cases of zero and room temperature are addressed.
description: 15 pages, 12 figures (submitted to J. Phys: Condens. Matter)
Dissolution of (50-x)Na₂O-xCaO-50P₂O₅ metaphosphate glasses in different saline Solutions: mechanism and kinetic control
Creators: name: Delahaye, Florence
name: Montagne, Lionel
name: Palavit, Gérard
name: Baillif, Patrick
name: Touray, Jean Claude
Publisher: name: Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft
Year: 1999
Subjects: subject: 660

description: The dissolution of (50-x)Na₂O-xCaO-50P₂O₅ metaphosphate glasses has been investigated at pH 3 in Solutions containing in Na⁺, Ca²⁺, Cl⁻, NO₃⁻ and (PO₃⁻)n ions. Whatever the conditions, a hydrated layer develops over a surface covered with etch pits. Na⁺ and Cl⁻ have no specific effect on the dissolution kinetics and mechanism. In Ca²⁺-containing Solutions, XPS, electrophoretic mobility and ³¹P NMR show that Na⁺ is exchanged for Ca²⁺ in the hydrated layer, resulting in a decreased dissolution rate. Polyphosphate anions, (PO₃⁻)n, act as complexing agent for Ca²⁺, and counterbalance its inhibiting effect on the dissolution rate.
A quest for frustration driven distortion in Y2Mo2O7
Creators: name: Sagi, Eva
name: Ofer, Oren
name: Keren, Amit
name: Gardner, Jason S.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We investigated the nature of the freezing in the geometrically frustrated Heisenberg spin-glass Y2Mo2O7 by measuring the temperature dependence of the static internal magnetic field distribution above the spin-glass temperature, Tg, using the muSR technique. The evolution of the field distribution cannot be explained by changes in the spin susceptibility alone and suggests a lattice deformation. This possibility is addressed by numerical simulations of the Heisenberg Hamiltonian with magneto-elastic coupling at T>0.
description: 5 pages 4 figures. Accepted for publication in PRL
title: Sayling, stories from the mothership: narrating political geographies of Nigerian campus cultism
Creators: name: Weaver, Kristina N.
Publisher: name: University of Glasgow
Year: 2010
Subjects: subject: Nigeria, campus cultism, student politics, postcolonialism, ethnography, oral history, fiction, radical geography

description: "Sayling, Stories from the Mothership" is a collection of ethnographic fictions – short stories – adapted from notes, archival materials, and interviews compiled over a year of geographic fieldwork in southwestern Nigeria. Touching on a wide range of themes, from domesticity to internet fraud, the stories explore the interface of occult violence and youth politics in the contemporary period. They are connected through overlapping characters and through their relationships to a central geography: the University of Ibadan (UI), Nigeria’s oldest and most prestigious institute of higher education and the site of origin for the nation’s first campus ‘cult’: the Pyrates Confraternity. The collection is, in essence, a character study of Nigerian campus cultism, itself. The stories are organized into three sections that can be mapped onto a ritual landscape: the stages of initiation, participation, and renunciation serve to link diverse voices and life stories. The dissertation is framed by a Preface and Epilogue that explore issues of race, representation, and reflexivity, themes that are important to a project engaging with living memories of contemporary violence. A critical prologue and footnotes throughout serve to connect the creative core of this work to larger academic, literary, and ethnographic contexts. An appendix features maps that highlight spaces and dates important to the stories as well as four original interview ‘transcripts’, semi-fictionalised records that provide both additional ethnographic detail and evidence of methodology.
Validation of a mathematical glass tank model
Creators: name: Bauer, Johannes
name: Roger, Ulrich
name: Simons, Philip
Publisher: name: Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft
Year: 1999
Subjects: subject: 660

description: In the past mathematical modelling of glass furnaces concentrated on the redesign and optimization of such aggregates. For the future, it is conceivable that such models will also be used for the control of glass furnaces. The present study showed that an increased occurrence of bubbles due to increased glass pull can be found in the results of the model, while a corresponding link between model and practice could not be found for solid inclusions. As a main cause for the limited correspondence between modelling and practice the dominating influence of recycled cullet and the frequent changes of the glass pull could be identified.
Induced two-photon decay of the 2s level and the rate of cosmological hydrogen recombination
Creators: name: Chluba, J.
name: Sunyaev, R. A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Induced emission due to the presence of soft CMB photons slightly increases the two-photon decay rate of the 2s level of hydrogen defining the rate of cosmological recombination. This correspondingly changes the degree of ionization, the visibility function and the resulting primordial temperature anisotropies and polarization of the CMB on the percent level. These changes exceed the precision of the widely used CMBFAST and CAMB codes by more than one order of magnitude and can be easily taken into account.
description: 5 pages, 5 figure, accepted by Astronomy and Astrophysics
Phase transition and entropic force of de Sitter black hole in massive gravity
Creators: name: Ma, Yubo
name: Zhang, Yang
name: Zhang, Lichun
name: Wu, Liang
name: Gao, Ying
name: Cao, Shuo
name: Pan, Yu
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: It is well known that de Sitter(dS) black holes generally have a black hole horizon and a cosmological horizon, both of which have Hawking radiation. But the radiation temperature of the two horizons is generally different, so dS black holes do not meet the requirements of thermal equilibrium stability, which brings certain difficulties to the study of the thermodynamic characteristics of black holes. In this paper, dS black hole is regarded as a thermodynamic system, and the effective thermodynamic quantities of the system are obtained. The influence of various state parameters on the effective thermodynamic quantities in the massive gravity space-time is discussed. The condition of the phase transition of the de Sitter black hole in massive gravity space-time is given. We consider that the total entropy of the dS black hole is the sum of the corresponding entropy of the two horizons plus an extra term from the correlation of the two horizons. By comparing the entropic force of interaction between black hole horizon and the cosmological horizon with Lennard-Jones force between two particles, we find that the change rule of entropic force between the two system is surprisingly the same. The research will help us to explore the real reason of accelerating expansion of the universe.
description: 14 pages,11 figures
Evaluation of reaction rate of refining agents
Creators: name: Kawachi, Shinji
name: Kato, Mitsuo
name: Kawase, Yoshinori
Publisher: name: Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft
Year: 1999
Subjects: subject: 660

description: To elucidate the thermal decomposition behavior of antimony oxide which is added to promote (re)fming of bubbles in TV glass, an evolved gas analysis (EGA) was conducted using a newly designed device for detecting the gases from the glass batch at increasing temperatures. Furthermore, a mathematical formulation was made to describe the above behavior. From the results of the EGA measurements, three parameters, which govern the reaction rate constant, viz. reaction order, activation energy and frequency factor, were decided. By coupling this mathematical model and the thermal fluid model of glass melts in tank furnaces, it is possible to simulate the conditions of generating refming oxygen in the furnace.
Why I Call it the Academic Ghetto: A Critical Examination of Race, Place, and Writing Centers
Creators: name: Lockett, Alexandria
Publisher: name: The University of Texas at Austin
Year: 2019
Subjects: black queer

description: This article investigates my lived experience as a black queer writing center tutor for the purposes of theorizing the transformative power of learning centers. Drawing on several perspectives and methods offered in Praxis’s special issue on Access and Equity in Graduate Writing Support, this article argues that the antiracist potential of writing centers depends on more comprehensive analyses of how writing centers function as racialized places. Using the metaphor of the “academic ghetto,” I signify on the misconception of writing centers as places for correcting deficiency. I apply my analysis to both an Undergraduate Writing Center (WCs) and a Graduate Writing Center (GWC) space to systematically discover how racial biases mediate and construct these learning spaces. In particular, I structure my discussion through a blend of personal narrative and critical analysis that illustrates the epistemic conflict and character of the “academic ghetto.” The article concludes with a call to invent antiracist practices for writing centers that model more inclusive methods of living in these spaces.
Quantum Brachistochrone
Creators: name: Carlini, Alberto
name: Hosoya, Akio
name: Koike, Tatsuhiko
name: Okudaira, Yosuke
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a general framework for finding the time-optimal evolution and the optimal Hamiltonian for a quantum system with a given set of initial and final states. Our formulation is based on the variational principle and is analogous to that for the brachistochrone in classical mechanics. We reduce the problem to a formal equation for the Hamiltonian which depends on certain constraint functions specifying the range of available Hamiltonians. For some simple examples of the constraints, we explicitly find the optimal solutions.
description: 4 pages, 1 figure
On clean, weakly clean, and feebly clean commutative group rings
Creators: name: Li, Yuanlin
name: Zhong, Qinghai
Publisher: name: arXiv
Year: 2020
Subjects: subject: Rings and Algebras (math.RA)
subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 16S34, 11R11, 11R18

description: A ring $R$ is said to be clean if each element of $R$ can be written as the sum of a unit and an idempotent. $R$ is said to be weakly clean if each element of $R$ is either a sum or a difference of a unit and an idempotent, and $R$ is said to be feebly clean if every element $r$ can be written as $r=u+e_1-e_2$, where $u$ is a unit and $e_1,e_2$ are orthogonal idempotents. Clearly clean rings are weakly clean rings and both of them are feebly clean. In a recent article (J. Algebra Appl. 17 (2018), 1850111(5 pages)), McGoven characterized when the group ring $\mathbb Z_{(p)}[C_q]$ is weakly clean and feebly clean, where $p, q$ are distinct primes. In this paper, we consider a more general setting. Let $K$ be an algebraic number field, $\mathcal O_K$ its ring of integers, $\mathfrak p\subset \mathcal O$ a nonzero prime ideal, and $\mathcal O_{\mathfrak p}$ the localization of $\mathcal O$ at $\mathfrak p$. We investigate when the group ring $\mathcal O_{\mathfrak p}[G]$ is weakly clean and feebly clean, where $G$ is a finite abelian group, and establish an explicit characterization for such a group ring to be weakly clean and feebly clean for the case when $K=\mathbb Q(ζ_n)$ is a cyclotomic field or $K=\mathbb Q(\sqrt{d})$ is a quadratic field.
description: To appear in Journal of algebra and its applications
Determination of the composition of glass, glass-ceramics and glass raw materials with Laser-ICP-MS
Creators: name: Strubel, Christine
name: Meckel, Lothar
name: Effenberger, Ruth
Publisher: name: Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft
Year: 1999
Subjects: subject: 660

description: Α mass-spectrometric method with an inductively coupled plasma as an ion source (ICP-MS) is presented which uses an excimer laser for direct ablation of solid material. The oxide compositions of a television screen glass, a glass-ceramic and a quartz powder analyzed by LA-ICP-MS are given and compared with data obtained by wet chemical analysis. Fundamental processes of the technique are described and advantages and disadvantages for the analysis of glass are discussed.
On the mechanical contribution of head stabilization to passive dynamics of anthropometric walkers
Creators: name: Benallegue, Mehdi
name: Laumond, Jean-Paul
name: Berthoz, Alain
Publisher: name: arXiv
Year: 2020
Subjects: subject: Robotics (cs.RO)
subject: Medical Physics (physics.med-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: During the steady gait, humans stabilize their head around the vertical orientation. While there are sensori-cognitive explanations for this phenomenon, its mechanical e fect on the body dynamics remains un-explored. In this study, we take profit from the similarities that human steady gait share with the locomotion of passive dynamics robots. We introduce a simplified anthropometric D model to reproduce a broad walking dynamics. In a previous study, we showed heuristically that the presence of a stabilized head-neck system significantly influences the dynamics of walking. This paper gives new insights that lead to understanding this mechanical e fect. In particular, we introduce an original cart upper-body model that allows to better understand the mechanical interest of head stabilization when walking, and we study how this e fect is sensitive to the choice of control parameters.
Exploring White Privilege in Tutor Education
Creators: name: Melzer, Dan
Publisher: name: The University of Texas at Austin
Year: 2019
Subjects: white privilege

description: In this article I report the results of action research focused on white writing center tutors’ attitudes toward white privilege. I studied four semesters of my tutoring internship course at a linguistically and ethnically diverse university, analyzing white tutors’ written responses and classroom discussions connected to a survey and assigned article focused on white privilege and tutoring. The themes that emerged in tutors’ “white talk” (McIntyre) regarding initiating/assimilating students to academic discourse caused me to rethink my curriculum and make white privilege a more central part of discussions about tutoring throughout the course.
Three-dimensional radiative heat transfer in glass cooling processes
Creators: name: Lentes, Frank Thomas
name: Siedow, Norbert
Publisher: name: Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft
Year: 1999
Subjects: subject: 660

description: For the numerical Simulation of 3D radiative heat transfer in glasses and glass melts, practically applicable mathematical methods are needed for optimal handling of problems using workstation-class Computers. Since the exact Solution would require Supercomputer capabilities, approximate Solutions with a high degree of accuracy are given. An improved diffusion approximation is presented. In contrast to the classical Rosseland approximation this method makes use of the geometry and the nongrey character for the absorption of glass. The improved 3D diffusion approximation studied in the following paper has the advantage to be both efficient and sufficiently accurate.
Evaluation of a Polymer Asphalt Additive -- Kraton
(1118 and 4141)
Creators: name: Fleckenstein, L. John
name: Allen, David L.
Publisher: name: Kentucky Transportation Center, University of Kentucky
Year: 1988
Subjects: subject: Transportation Engineering

description: This report documents the use of two types of asphaltic concrete mixture designs. Both the control mixture and a Kraton rubber mixture were placed on sections of the Hazard Bypass, in Hazard, Kentucky. The location of the project is shown in Figure 1.
Homogeneous complex networks
Creators: name: Bogacz, Leszek
name: Burda, Zdzislaw
name: Waclaw, Bartlomiej
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We discuss various ensembles of homogeneous complex networks and a Monte-Carlo method of generating graphs from these ensembles. The method is quite general and can be applied to simulate micro-canonical, canonical or grand-canonical ensembles for systems with various statistical weights. It can be used to construct homogeneous networks with desired properties, or to construct a non-trivial scoring function for problems of advanced motif searching.
description: 19 pages, 9 figures
Optimizing the Christiansen-Shelyubskii method and its comparison with industrial control methods for homogeneity determination of glasses
Creators: name: Heidrich, Roland Paul
name: Frischat, Günther Heinz
Publisher: name: Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft
Year: 1999
Subjects: subject: 660

description: The Christiansen-Shelyubskii method used in this work was optimized experimentally. Different tests were performed with two grain fractions of standardized crushed sheet glass. Maximum transmissions, half-widths and their Standard deviations were optimized, and it was further shown that sampling, an appropriate cleaning of the granulated glass and the quality of the optical cells used are of great importance, too. Α variety of industrial glasses was investigated and the Christiansen-Shelyubskii homogeneity numbers were compared with the homogeneity data provided by the glass manufacturers using industrial homogeneity control methods for Container, tube and flat glasses, respectively. Although the physical principles of the homogeneity methods compared were dissimilar, mostly qualitatively similar trends were found. Only in the case of the Mach-Zehnder interferometry method, which is based on a similar principle as the Christiansen-Shelyubskii method, a quantitative correlation analysis was possible. Reasonable agreement between the homogeneity values from both methods was achieved. It was further shown that the Christiansen-Shelyubskii method can monitor the homogeneity during glass melting with external cullet, both in freshly prepared and in composted states.
ТАҲДИДЛАРНИНГ АХБОРОТ ХАВФСИЗЛИГИ СОҲАСИДАГИ  КЎРИНИШЛАРИ ХУСУСИДА
Creators: name: Аллаков, Илҳом
Publisher: name: Zenodo
Year: 2024

description: Шахс тараққиёти ва унга ёндашув билан боғлиқ ижтимоий фаолиятни кузатиш, улар билан гуруҳий ижтимоийлашув ҳодисасидаги йўналганликни аниқлаш. Шунингдек, шахсда миллий қадриятлар шаклланиши бўйича установкаларни баҳолаш. Ижтимоий гуруҳлар, ахборот, хусусан талабаларда миллий қадриятлар ҳамда мафкуранинг шаклланиши шароитида таъсир этувчи ижтимоий омиллар диагностикаси ҳақида сўз боради.
Positional regulation and evolution of mating type genes in heterothallic and homothallic species of neurospora
Creators: name: Vellani, Trina (Tia) Sehar
Publisher: name: University of British Columbia
Year: 2009

description: The mating type genes of Neurospora crassa were shown to function abnormally when located at ectopic chromosomal positions. Crosses involving strains with ectopic mating type genes produce defective perithecia. Ascus number is reduced. The hypothesis that perithecial development requires physical proximity of opposite mating type homologs during meiosis was tested. The sterility of the crosses made between strains with both mating type regions relocated to the same ectopic position failed to support the hypothesis. To test the hypothesis that normal expression levels of the mating type genes require distant cw-acting sequences not present on ectopic fragments, autoradiograms of mRNA from wild type and ectopic-w^ strains were compared. Differences between expression levels in ectopic-/rtf and wild type cells were observed, but their significance cannot be assessed without additional studies. The hypothesis that nuclear identity is disrupted in ectopic-m/ strains was tested. Strains with disturbed nuclear identity (dual mating type) were crossed to wild type. The appearance of the reduced ascus number phenotype suggested that the affected function in ectopic-m/ strains is nuclear identity. The homothallic species N. terricola contains mt A- and mt a-like sequences. The genes were cloned and sequenced to determine whether or not they were functional. The genes specifying identity, mt A-l and mt a-l, are more than 95% similar at the amino acid level to the N. crassa homologs, but the putative MT A-2 polypeptide is truncated. N. terricola ml A-l and mt a-l genes induced mating and vegetative incompatibility in N. crassa mating type mutants. Expression in N. terricola of mt A-l and mt a-l was detected by reverse transcriptase PCR, upholding the hypothesis that the genes are functional. To determine the pattern of evolution of homothallism, a phylogeny of Neurospora was reconstructed from mt A-l DNA and amino acid sequences. Homothallic Neurospora species that carry both mating type genes are more closely related to heterothallic species than they are to the ^4-only homothallic species, suggesting that either heterothallic species are derived from a homothallic ancestor or that homothallism arose twice.
The Rapid Build-up of Massive Early-type Galaxies. Supersolar Metallicity, High Velocity Dispersion and Young Age for an ETG at z=3.35
Creators: name: Saracco, Paolo
name: Marchesini, Danilo
name: La Barbera, Francesco
name: Gargiulo, Adriana
name: Annunziatella, Marianna
name: Forrest, Ben
name: Vagle, Daniel J. Lange
name: Marsan, Z. Cemile
name: Muzzin, Adam
name: Stefanon, Mauro
name: Wilson, Gillian
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Thanks to very deep spectroscopic observations carried out at the Large Binocular Telescope, we measured simultaneously stellar age, metallicity and velocity dispersion for C1-23152, an ETG at redshift $z$=3.352, corresponding to an epoch when the Universe was $\sim$1.8 Gyr old. The analysis of its spectrum shows that this galaxy, hosting an AGN, formed and assembled $\sim$2$\times$10$^{11}$ M$_\odot$ shaping its morphology within the $\sim$600 Myr preceding the observations, since $z$$\sim$4.6. The stellar population has a mean mass-weighted age 400$^{+30}_{-70}$ Myr and it is formed between $\sim$600 Myr and $\sim$150 Myr before the observed epoch, this latter being the time since quenching. Its high stellar velocity dispersion, $σ_e$=409$\pm$60 km s$^{-1}$, confirms the high mass (M$_{dyn}$=$2.2(\pm0.4)$$\times$10$^{11}$ M$_\odot$) and the high mass density ($Σ_e^{M^*}$=$Σ_{1kpc}=3.2(\pm0.7)\times10^{10}$ M$_\odot$ kpc$^{-2}$), suggesting a fast dissipative process at its origin. The analysis points toward a supersolar metallicity, [Z/H]=0.25$^{+0.006}_{-0.10}$, in agreement with the above picture, suggesting a star formation efficiency much higher than the replenishment time. However, sub-solar metallicity values cannot be firmly ruled out by our analysis. Quenching must have been extremely efficient to reduce the star formation to SFR$
description: 20 pages, 12 figures. Accepted for publication in ApJ (revised to match the ApJ version)