Physical Sciences and Mathematics Commons^™

"Stratigraphic Analysis Of Upper Cretaceous Rocks In The Mahajanga Basin, Northwestern Madagascar: Implications For Ancient And Modern Faunas: Reply.", Raymond Rogers, J.H. Hartman, D.W. Krause

Raymond Rogers

No abstract provided.

Średni Współczynnik Toksyczności Spalin Emitowanych Z Procesów Spopielania Odpadów Niebezpiecznych, Robert Oleniacz

Robert Oleniacz

The paper presents the characteristics of the Average Toxicity Factor (ATF) for combustion gases emitted from incineration of hazardous waste. Proposals for the interpretation of this factor and the possibility of its use in assessing the degree of nuisance of the process in terms of the level of air pollutant emissions were also discussed.

English title: Average toxicity factor of combustion gases emitted from hazardous waste incineration.

Electroproduction Of The Λ(1520) Hyperon, S P. Barrow, L Dennis, S B. Mcaleer, B Asavapibhop, R S. Hicks, D Lawrence, R Miskimen, Gerald Alvin Peterson, J Shaw

Gerald Alvin Peterson

The reaction ep⃗e′K+Λ(1520) with Λ(1520)→p′K- was studied at electron beam energies of 4.05, 4.25, and 4.46 GeV, using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The cosθK+, φK+, Q2, and W dependencies of Λ(1520) electroproduction are presented for the kinematic region 0.9

Elliptic Functions And Equations Of Modular Curves, Lev A. Borisov, Paul E. Gunnells, Sorin Popescu

Paul Gunnells

Let P≥5 be a prime. We show that the space of weight one Eisenstein series defines an embedding into P(p−3)/2 of the modular curve X1(p) for the congruence group Γ1(p) that is scheme-theoretically cut out by explicit quadratic equations.

Oral History Interview With Glenn Henry, Philip L. Frana

Philip L Frana

Glenn Henry begins by briefly outlining his education and early work career prior to joining IBM. The majority of the interview focuses on Henry's work as a software systems engineer and manager at IBM in the 1970s. Henry was centrally involved in the software development and hardware definitions for IBM's early Midrange Series computers. He had managerial roles at IBM San Jose and IBM Boca Raton before leading a large team at the home of IBM Midrange Series hardware and software development, IBM Rochester. He details the ...

The Use Of Self-Directed Learning To Promote Active Citizenship In Science, Technology, And Society Classes, Joshua M. Pearce

Joshua M. Pearce

Insufficiency Of Piecewise Evolution, Sanza Kazadi, Yan Qi, Isaac Park, Nancy Huang, Paul Hwu, Brian Kwan, Wayne Lue, Hubert Li

Sanza Kazadi

Microscopic Kinetics And Time-Dependent Structure Factors, T. Aspelmeier, Beate Schmittmann, R. K. P. Zia

Beate Schmittmann

The time evolution of structure factors (SF) in the disordering process of an initially phase-separated lattice depends crucially on the microscopic disordering mechanism, such as Kawasaki dynamics (KD) or vacancy-mediated disordering (VMD). Monte Carlo simulations show unexpected “dips” in the SFs. A phenomenological model is introduced to explain the dips in the odd SFs, and an analytical solution of KD is derived, in excellent agreement with simulations. The presence (absence) of dips in the even SFs for VMD (KD) marks a significant but not yet understood difference of the two dynamics.

The Power Of Two Random Choices: A Survey Of Techniques And Results, Michael Mitzenmacher, Andrea Richa, Ramesh Sitaraman

Ramesh Sitaraman

No abstract provided.

Transforming Self-Rated Health And The Sf-36 Scales To Include Death And Improve Interpretability, Paula Diehr

Paula Diehr

BACKGROUND: Most measures of health-related quality of life are undefined for people who die. Longitudinal analyses are often limited to a healthier cohort (survivors) that cannot be identified prospectively, and that may have had little change in health. OBJECTIVE: To develop and evaluate methods to transform a single self-rated health item (excellent to poor; EVGGFP) and the physical component score of the SF-36 (PCS) to new variables that include a defensible value for death. METHODS: Using longitudinal data from two large studies of older adults, health variables were transformed to the probability of being healthy in the future, conditional on …

Modelling X-Ray Variability In The Structured Atmospheres Of Hot Stars., L. M. Oskinova, R. Ignace, J. C. Brown, J. P. Cassinelli

Richard Ignace

We describe X-ray production in the atmospheres of hot, early-type stars in the framework of a "stochastic shock model". The extended envelope of a star is assumed to possess numerous X-ray emitting "hot" zones that are produced by shocks and embedded in the ambient "cold" medium in dynamical equilibrium. It is shown that the apparent lack of X-ray variability on short (similar to hours) timescales do not contradict a shock model for X-ray production. The character of the X-ray variability is found to depend on the frequency with which hot zones are generated, the cool wind opacity to X-rays, and …

Dobór Systemu Oczyszczania Gazów Odlotowych Ze Spalania Odpadów Niebezpiecznych, Robert Oleniacz

Robert Oleniacz

The flue gas cleaning system is usually one of the most costly elements of the installation to the incineration of hazardous waste. Adapting the system to the actual needs could therefore bring obvious economic benefits.

The paper presents the method of the preselection of the configuration of the cleaning system based on knowledge of the level of concentration of selected components of the raw exhaust gas (sulfur dioxide, hydrogen chloride, hydrogen fluoride, total dust, mercury, cadmium and thallium, and other heavy metals). Twelve examples of flue-gas cleaning systems were proposed and extreme concentration values of the substances in the raw …

Niezorganizowana Emisja Zanieczyszczeń Powietrza Z Hal Ciągłego Odlewania Stali, Marian Mazur, Marek Bogacki, Robert Oleniacz, Agnieszka Łopata

Robert Oleniacz

Air pollutant emissions occurring in an uncontrolled way do not be subject to the regular verification just like it takes place in case of the controlled sources, for which the routine measurements are carried out. In the paper a methodology and the results of some research were presented. The research consisted in determination the quantity of dust and gaseous pollutants emitted from the halls in which technological processes connected with the steel continuous casting were being run. Stocktaking of all the uncontrolled emission sources were carried out and the technological operations predominating in the level of the particle matter and …

Russian Summary Of Phd Dissertation, Serge Y. Kalmykov

Serge Youri Kalmykov

Notarized English Translation Of The Author's Summary Of Phd Dissertation, Serge Y. Kalmykov

Serge Youri Kalmykov

Stimulated Raman Scattering Of Short Intense Laser Pulses In Plasmas, Serge Y. Kalmykov

Serge Youri Kalmykov

Measurement Of The Elastic Magnetic Form Factor Of 3he At High Momentum Transfer, I Nakagawa, J Shaw, S Churchwell, X Jiang, B Asavapibhop, M C. Berisso, P E. Bosted, K Burchesky, R S. Hicks, A Hotta, R A. Miskimen, Gerald Alvin Peterson, S E. Rock

Gerald Alvin Peterson

New electron scattering measurements have been made that extend data on the 3He elastic magnetic form factor up to Q2 = 42.6fm-2. These new data test theoretical conjectures regarding non-nucleonic effects in the three-body system. The very small cross sections, as low as 10-40cm2/sr, required the use of a high-pressure cryogenic gas target and a detector system with excellent background rejection capability. No existing theoretical calculation satisfactorily accounts for all the available data.

Excitation Of Ion-Acoustic-Like Waves By Subcritical Currents In A Plasma Having Equal Electron And Ion Temperatures, Erick Agrimson, Nicola D'Angelo, Robert L. Merlino

Erick Agrimson

No abstract provided.

Ultraviolet Lasing In Cholesteric Liquid Crystals, A. F., Peter Palffy-Muhoray, B. Taheri

Peter Palffy-Muhoray

We report the observation of stimulated emission and mirrorless lasing in pure cholesteric liquid crystals. The lasing action is attributed to the combination of the fluorescence and the distributed feedback that are due to the inherent periodic structure of the liquid crystal. If the reflection band matches the intrinsic emission of the cholesteric liquid crystal, the crystal becomes a natural laser material, which will self-lase, without any optical elements or the addition of dyes, under picosecond excitation at 355 nm. Samples have been made to lase at different wavelengths in the near UV by shifting of the edge of the …

A Solid State 13c Nmr Study Of Kerogen Degradation During Black Shale Weathering, Steven T. Petsch, R. J. Smernik, T. I. Eglinton, J. M. Oades

Steven T. Petsch

Solid state 13C nuclear magnetic resonance (NMR) spectroscopy is used to examine kerogen composition in weathering profiles of the Monterey, Green River, Woodford, and New Albany formations. Techniques include cross polarization (CP) and Bloch decay (BD) spectral acquisition, dipolar dephasing (DD), spin counting, experiments to provide estimates of relaxation times (T1ρH and T1H), and proton spin relaxation editing (PSRE). It is demonstrated that CP/MAS (cross polarization/magic angle spinning) spectra obtained on isolated kerogens provide reliable characterization of kerogen composition (compared with BD spectra and whole-rock samples). Highly aliphatic (polymethylenic) kerogens are not appreciably altered during weathering. Aromatic and/or branched aliphatic …

Ozone And Tracer Transport Variations In The Summer Northern Hemisphere Stratosphere, E. C. Cordero, S. R. Kawa

Eugene C. Cordero

Constituent observations from the Upper Atmosphere Research Satellite (UARS) in combination with estimates of the residual circulation are used to examine the transport and chemical budgets of HF, CH₄ and O₃ in the summer Northern Hemisphere. Budget calculations of HF, CH₄ and O₃ show that the transport tendency due to the residual circulation increases in magnitude and is largely opposed by eddy motions through the summer months. Ozone budget analyses show that between 100 and 31 hPa, the magnitudes of the mean circulation and eddy transport terms increase through the summer months, producing tendencies that are …

Verifying Properties Of Neural Networks, Pedro Rodriques, J. Félix Costa, Hava Siegelmann

Hava Siegelmann

In the beginning of nineties, Hava Siegelmann proposed a new computational model, the Artificial Recurrent Neural Network (ARNN), and proved that it could perform hypercomputation. She also established the equivalence between the ARNN and other analog systems that support hypercomputation, launching the foundations of an alternative computational theory. In this paper we contribute to this alternative theory by exploring the use of formal methods in the verification of temporal properties of ARNNs. Based on the work of Bradfield in verification of temporal properties of infinite systems, we simplify his tableau system, keeping its expressive power, and show that it is …

On The Effect Of Electron Plasma Waves With Relativistic Phase Velocity On Large-Angle Stimulated Raman Scattering Of Modulated Short Laser Pulse In Plasmas, Nikolai E. Andreev, Serguei Y. Kalmykov

Serge Youri Kalmykov

Suppression of a large-angle stimulated Raman scattering (LA-SRS) of a short modulated (two-frequency) laser pulse in a transparent plasma in the presence of a linear long-wavelength electron plasma wave (LW EPW) having relativistic phase velocity is considered under the conditions of weak and strong coupling. The laser spectrum includes two components with a frequency shift equal to the frequency of the LW EPW. The mutual influence of different spectral components of a laser on the SRS under a given angle in the presence of the LW EPW is examined.

Effects Of Sampling Standardization On Estimates Of Phanerozoic Marine Diversification, J. Alroy, C. R. Marshall, R. K. Bambach, K. Bezusko, M. Foote, F. T. Fürsich, Thor A. Hansen, S. M. Holland, L. C. Ivany, D. Jablonski, D. K. Jacobs, D. C. Jones, M. A. Kosnik, S. Lidgard, S. Low, A. I. Miller, P. M. Novack-Gottshall, T. D. Olszewski, M. E. Patzkowsky, D. M. Raup, K. Roy, J. J. Sepkoski Jr., M. G. Sommers, P. J. Wagner, A. Webber

Thor A. Hansen

Global diversity curves reflect more than just the number of taxa that have existed through time: they also mirror variation in the nature of the fossil record and the way the record is reported. These sampling effects are best quantified by assembling and analyzing large numbers of locality-specific biotic inventories. Here, we introduce a new database of this kind for the Phanerozoic fossil record of marine invertebrates. We apply four substantially distinct analytical methods that estimate taxonomic diversity by quantifying and correcting for variation through time in the number and nature of inventories. Variation introduced by the use of two …

Exclusive Electroproduction Of Φ Mesons At 4.2 Gev, K Lukashin, E S. Smith, B Asavapibhop, R A. Hicks, D Lawrence, R Miskimen, Gerald Alvin Peterson, J Shaw

Gerald Alvin Peterson

We studied the exclusive reaction ep⃗e′p′φ using the φ⃗K+K- decay mode. The data were collected using a 4.2 GeV incident electron beam and the CEBAF Large Acceptance Spectrometer (CLAS) at the Thomas Jefferson National Accelerator Facility. Our experiment covers the range in Q2 from 0.7 to 2.2 GeV2, and W from 2.0 to 2.6 GeV. Taken together with all previous data, we find a consistent picture of φ production on the proton. Our measurement shows the expected decrease of the t slope with the vector-meson formation time cΔτ below 2 fm. At 〈cΔτ〉=0.6 fm, we measure bφ=2.27±0.42 GeV-2. The cross …

Oral History Interview With Dick Hedger, Philip L. Frana

Philip L Frana

Richard Hedger begins the interview describing his education in electrical engineering at the University of Minnesota. Following graduation he accepted a position at IBM Rochester in the optical character recognition group. He then discusses his shift to software development. Eventually he joined the Service and Support group developing application software supporting facilities infrastructures for the IBM System/3, and System/360. In various places in the interview, he describes some of the programming techniques in ...

Quantization Of Maximally Charged Slowly Moving Black Holes, George Siopsis

George Siopsis

We discuss the quantization of a system of slowly moving extreme Reissner-Nordström black holes. In the near-horizon limit, this system has been shown to possess an SL(2,R) conformal symmetry. However, the Hamiltonian appears to have no well-defined ground state. This problem can be circumvented by a redefinition of the Hamiltonian due to de Alfaro, Fubini, and Furlan (DFF). We apply the Faddeev-Popov quantization procedure to show that the Hamiltonian with no ground state corresponds to a gauge in which there is an obstruction at the singularities of moduli space requiring a modification of the quantization rules. The …

A Homotopy Theory Of Orbispaces, Weimin Chen Chen

Weimin Chen

An orbifold is a singular space which is locally modeled on the quotient of a smooth manifold by a smooth action of a finite group. It appears naturally in geometry and topology when group actions on manifolds are involved and the stabilizer of each fixed point is finite. The concept of an orbifold was first introduced by Satake under the name “V -manifold” in a paper where he also extended the basic differential geometry to his newly defined singular spaces (cf. [32]). The local structure of an orbifold – being the quotient of a smooth manifold by a finite group …

Visualizing Rhizosphere Chemistry Of Legumes With Mid-Infrared Synchrotron Radiation, Ted K. Raab, Michael C. Martin

Ted K. Raab

A bright synchrotron light source operated by the Lawrence Berkeley National Laboratory served as an external source for infrared (IR) microscopy of plant root microcosms. Mid-IR light from synchrotrons is 2-3 orders of magnitude brighter than conventional sources, providing contrast based on the chemical information in the reflected signal at a spatial resolution near the diffraction-limit of 3-10 microns. In an experiment using plant root microcosms fitted with zinc selenide IR-transmissive windows (50 mm x 20 mm x 1 mm), we describe chemical differences and similarities within the root zone of mung bean (Vigna radiata L.), grown with or without …

Simulation Of Inviscid Multi-Species Plasma Flow, Alexandre Martin, Marcelo Reggio, Jean-Yves Trépanier

Alexandre Martin

A multi-species solver for plasma at thermodynamical equilibrium is developed. A numerical scheme, based on Roe's, is implemented with some modification regarding the average quantities. A perfect gas treatment is carried out for validations, and a quasi-real gas treatment is also presented. The latter takes into account the changes in the composition of the gas caused by fluctuations in temperature and density.