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Articles 2371 - 2400 of 2553
Full-Text Articles in Physical Sciences and Mathematics
Preparation, Crystal Structure, And Physical Properties Of A Pyrogallol-Bridged Vanadium(Iii) Complex, Seunghee Lee, Koji Nakanishi, Michael Y. Chiang, Richard B. Frankel, K. Spartalian
Preparation, Crystal Structure, And Physical Properties Of A Pyrogallol-Bridged Vanadium(Iii) Complex, Seunghee Lee, Koji Nakanishi, Michael Y. Chiang, Richard B. Frankel, K. Spartalian
Physics
The structure, n.m.r. spectrum, and magnetic properties of the vanadium(III) dimer [(acac)4V2{µ-OC6H3(OH)2}2] formed from [VO(acac)2] and an excess of pyrogallol are described.
Bacterial Biomagnetism And Geomagnetic Field Detection By Organisms, Richard P. Blakemore, Nancy A. Blakemore, Richard B. Frankel
Bacterial Biomagnetism And Geomagnetic Field Detection By Organisms, Richard P. Blakemore, Nancy A. Blakemore, Richard B. Frankel
Physics
No abstract provided.
Magnetite And Magnetotaxis In Microorganisms, Richard B. Frankel, R. P. Blakemore
Magnetite And Magnetotaxis In Microorganisms, Richard B. Frankel, R. P. Blakemore
Physics
No abstract provided.
Anomalous Magnetic Properties Of Some High-Temperature Magnetic Superconductors, P. H. Hor, R. L. Meng, C. W. Chu, C. Y, Huang, R, B. Frankel
Anomalous Magnetic Properties Of Some High-Temperature Magnetic Superconductors, P. H. Hor, R. L. Meng, C. W. Chu, C. Y, Huang, R, B. Frankel
Physics
No abstract provided.
Observation Of Substitutional Site Preference In A Quasicrystal And Implication On Local Structure, M. Eibschütz, M. E. Lines, H. S. Chen, J. V. Waszczak, G. C. Papaefthymiou, Richard B. Frankel
Observation Of Substitutional Site Preference In A Quasicrystal And Implication On Local Structure, M. Eibschütz, M. E. Lines, H. S. Chen, J. V. Waszczak, G. C. Papaefthymiou, Richard B. Frankel
Physics
A combination of magnetic susceptibility and Mössbauer measurements on quasicrystalline i-Al74Mn20-xFexSi6 (0.02≤x≤7.5) establishes that Mn atoms in i-Al74Mn20Si6 occupy two distinct classes of sites, and that Fe substitutes for only one of them. The two classes are distinguished by the possession or otherwise of a localized magnetic moment. The data are consistent with a structure of interconnecting Mackay icosahedra (MI) in which localized moments are possessed only by Mn atoms adjacent to "broken" MI connections. The implied connectivity of the resulting MI network is close to …
Anaerobes Pumping Iron, Richard B. Frankel
Observation Of Possible Supercondictivity At 230 K, C. Y. Huang, L. J. Dries, P. H. Hor, R. L. Meng, C. W. Chu, Richard B. Frankel
Observation Of Possible Supercondictivity At 230 K, C. Y. Huang, L. J. Dries, P. H. Hor, R. L. Meng, C. W. Chu, Richard B. Frankel
Physics
Recently, Chu announced the observation of sharp drops of up to two orders of magnitude in the resistance of several Y-, Sc- and La-based multi-phase Ba–Cu oxide samples at temperatures as high as 240 K. The resistance drops reported did not survive the thermal cyclings for magnetic measurements. Later, M. H. Cohen (personal communication) reported similar anomalies in some Y-based oxides. In the absence of zero resistivity and evidence for the Meissner effect, the sharp resistance drops have been taken only as an indication of the possible existence of superconductivity at these unusually high temperatures. More recently, Chen et al. …
A Sharp Partitioning-Inequality For Non-Atomic Probability Measures Based On The Mass Of The Infimum Of The Measures, Theodore P. Hill
A Sharp Partitioning-Inequality For Non-Atomic Probability Measures Based On The Mass Of The Infimum Of The Measures, Theodore P. Hill
Research Scholars in Residence
If μ1, ... ,μn are non-atomic probability measures on the same measurable space (S, F), then there is an F-measurable partition {Ai }ni = 1 of S so that μ1 (Ai )≥ (n – 1 + m)–1 for all i=1, ..., n, where m = ∥ Δni=1 μi∥ is the total mass of the largest measure dominated by each of the μi's; moreover, this bound is attained for all n≥1 and all m in [0, 1]. …
Science And Society Test X: Energy Conservation, David W. Hafemeister
Science And Society Test X: Energy Conservation, David W. Hafemeister
Physics
United States energy consumption has remained essentially constant at about 80 exajoules/year (75 quads/year) since the oil embargo of 1973–1974, while the GNP in constant dollars has increased by about 30%. This article will discuss the physics behind some of these improvements in end-use efficiency in such areas as: (i) buildings (scaling laws, "free-heat,'' superinsulated houses, thermal storage in large buildings, off-peak cooling), (ii) solar energy (passive, photovoltaics), (iii) utility load management ("smart meters,'' capital recovery fees, voltage control), (iv) appliances (life-cycle costs, refrigerators), and (v) lighting (isotopic enhancement).
Partitioning General Probability Measures, Theodore P. Hill
Partitioning General Probability Measures, Theodore P. Hill
Research Scholars in Residence
Suppose μ1, ..., μn are probability measures on the same measurable space (Ω, F). Then if all atoms of each μi have mass α or less, there is a measurable partition A1,..., An of Ω so that μi(Ai) ≥ Vn(α) for all i = 1, ... , n, where Vn(•) is an explicitly given piecewise linear nonincreasing continuous function on [0, 1]. Moreover, the bound Vn(α) is attained for all n and all α. Applications are given to L1 spaces, to …
Binding Of Fe2+ By Mammalian Ferritin, Richard B. Frankel, G. C. Papaefthymiou, G. D. Watt
Binding Of Fe2+ By Mammalian Ferritin, Richard B. Frankel, G. C. Papaefthymiou, G. D. Watt
Physics
An average of 140 Fe2+ ions bind to mammalian ferritin that has an average core content of 1876 Fe3+ ions per molecule. The Fe2+ ions enter the protein interior and exchange electrons with the core Fe3+ ions. A non-homogeneous model for the iron-containing core of ferritin is proposed.
Demountable Piezoelectric Transducer Holder For Use At Low Temperatures, Matthew J. Moelter, M. B. Manning, C. Ebaum
Demountable Piezoelectric Transducer Holder For Use At Low Temperatures, Matthew J. Moelter, M. B. Manning, C. Ebaum
Physics
We present a design for a piezoelectric transducer holder for use at low temperatures, which is easily constructed and assembled. Improved acoustic signals with "ringing" eliminated were reliably obtained. The standard problems of demountability, electrical integrity, and leak tightness in the presence of liquid helium at moderate pressures were resolved.
A Generalization Of Lyapounov's Convexity Theorem To Measures With Atoms, John Elton, Theodore P. Hill
A Generalization Of Lyapounov's Convexity Theorem To Measures With Atoms, John Elton, Theodore P. Hill
Research Scholars in Residence
The distance from the convex hull of the range of an n-dimensional vector-valued measure to the range of that measure is no more than α n/2, where α is the largest (one-dimensional) mass of the atoms of the measure. The case α = 0 yields Lyapounov's Convexity Theorem; applications are given to the bisection problem and to the bang-bang principle of optimal control theory.
The Existence Of Good Markov Strategies For Decision Processes With General Payoffs, Theodore P. Hill, Victor C. Prestien
The Existence Of Good Markov Strategies For Decision Processes With General Payoffs, Theodore P. Hill, Victor C. Prestien
Research Scholars in Residence
For countable-state decision processes (dynamic programming problems), a general class of objective functions is identified for which it is shown that good Markov strategies always exist. This class includes product and lim inf rewards, as well as practically all the classical dynamic programming expected payoff functions.
Operations With Distribution Vectors, Brian Fisher, Todor D. Todorov
Operations With Distribution Vectors, Brian Fisher, Todor D. Todorov
Mathematics
No abstract provided.
Expectation Inequalities Associated With Prophet Problems, Theodore P. Hill
Expectation Inequalities Associated With Prophet Problems, Theodore P. Hill
Research Scholars in Residence
Applications of the original prophet inequalities of Krengel and Sucheston are made to problems of order selection, non-measurable stop rules, look-ahead stop rules, and iterated maps of random variables. Also, proofs are given of two results of Hill and Hordijk concerning optimal orderings of uniform and exponential distributions
Mössbauer Spectroscopy Of Reduced Ferritin, Richard B. Frankel, G. C. Papaefthymiou, G. D. Watt
Mössbauer Spectroscopy Of Reduced Ferritin, Richard B. Frankel, G. C. Papaefthymiou, G. D. Watt
Physics
No abstract provided.
Central California Oak Residue Utilization And Marketing: Better Hardwood Management From Improved Utilization, Timothy G. O'Keefe, Douglas D. Piirto
Central California Oak Residue Utilization And Marketing: Better Hardwood Management From Improved Utilization, Timothy G. O'Keefe, Douglas D. Piirto
Natural Resources Management and Environmental Sciences
Limited information and observations indicate that there are some significant amounts of hardwood residue resources now available in the Central Coast area. Experience gained from managing and marketing eastern hardwoods is considered as our basis for dealing with western hardwood problems. Inventory of the oak resource is discussed as a preliminary requirement for management. In addition, hardwood marketing, research and extension needs are also considered. Evidence indicates that western hardwood use will be improved by better funded programs of research and extension in residue utilization and marketing. Improved hardwood utilization will yield both direct and indirect benefits. Direct benefits include …
Effects Of Second Sound On Acoustic Trasmission At The Solid-Liquid 4He Interface, Matthew J. Moelter, M. B. Manning, C. Elbaum
Effects Of Second Sound On Acoustic Trasmission At The Solid-Liquid 4He Interface, Matthew J. Moelter, M. B. Manning, C. Elbaum
Physics
We have calculated the reflection and transmission coefficients of acoustic waves propagating across a solid-liquid interface of 4He, using an extension of the treatment of Castaing and Nozières in which we include pressure changes associated with second sound. These calculations account well for the experimental results obtained over the temperature range 0.83 K≤ T ≤1.46 K and provide an alternative explanation to the one we offered previously for the lack of agreement between experiment and the theory of Castaing and Nozières.
Prophet Inequalities For Averages Of Independent Non-Negative Random Variables, Theodore P. Hill
Prophet Inequalities For Averages Of Independent Non-Negative Random Variables, Theodore P. Hill
Research Scholars in Residence
No abstract provided.
Optimal-Partitioning Inequalities For Nonatomic Probability Measures, John Elton, Theodore P. Hill, Robert P. Kertz
Optimal-Partitioning Inequalities For Nonatomic Probability Measures, John Elton, Theodore P. Hill, Robert P. Kertz
Research Scholars in Residence
Suppose μ1,...,μn are nonatomic probability measures on the same measurable space (S, B). Then there exists a measurable partition {Si}ni=1 of S such that μi(Si) ≥ (n + 1 - M)-1 for all i = 1,...,n, where M is the total mass of Vni=1μ1 (the smallest measure majorizing each μi). This inequality is the best possible for the functional M, and sharpens and quantifies a well-known cake-cutting theorem of Urbanik and of Dubins and Spanier. Applications are made to L1-functions, discrete allocation problems, statistical decision theory, …
Magnetite And Magnetotaxis In Algae, F. F. Torres De Araujo, M. A. Pires, Richard B. Frankel, C. E. M. Bicudo
Magnetite And Magnetotaxis In Algae, F. F. Torres De Araujo, M. A. Pires, Richard B. Frankel, C. E. M. Bicudo
Physics
Magnetotactic algae of the genus Anisonema (Euglenophyceae) have been isolated from a coastal mangrove swamp in northeastern Brazil. The magnetotactic response is based on a permanent magnetic dipole moment per cell ~7 10-10 emu. Each cell contains many magnetite (Fe3O4) particles organized in chains.
Science And Society Test Ix: Technical Means Of Verification, David W. Hafemeister
Science And Society Test Ix: Technical Means Of Verification, David W. Hafemeister
Physics
Technical means of monitoring are used to verify compliance to arms control treaties. Numerical estimates are developed in order to quantify some aspects of (1) nuclear testing (signatures, optical double pulse calibration, decoupling in cavities, and high-frequency components in seismic signals), (2) optical reconnaissance (films versus CCDs, air turbulence, adaptive optics, and digital image processing), (3) infrared (resolution and detection sensitivity), and (4) radar (synthetic aperture and missile coefficient).
Rewarding Scientists Who Pursue And Discuss Physics In The Public Interest, David W. Hafemeister, Barbara Levi
Rewarding Scientists Who Pursue And Discuss Physics In The Public Interest, David W. Hafemeister, Barbara Levi
Physics
No abstract provided.
The Cal Poly House Doctor Lab, David W. Hafemeister
Magnetic Skeletons In Davy Jones' Locker, Richard B. Frankel
Carrier-Concentration–Induced Ferromagnetism In Pbsnmnte, T. Story, R. R. Galazka, Richard B. Frankel, P. A. Wolff
Carrier-Concentration–Induced Ferromagnetism In Pbsnmnte, T. Story, R. R. Galazka, Richard B. Frankel, P. A. Wolff
Physics
The influence of charge-carrier concentration on the magnetic properties of the semimagnetic semiconductor [(PbTe)1-x(SnTe)x]1-y[MnTe] y (x=0.72, y=0.03) is reported. Magnetization, magnetic susceptibility, and specific heat have been measured. For carrier concentrations below p=3 x 1020 cm-3 the alloy is paramagnetic. For p≥3 x 1020 cm-3 an abrupt transition to a ferromagnetic phase is observed at helium temperatures. The ferromagnetic transition temperature increases with increasing p. This is the first demonstration of the effect of carrier concentration on the magnetic properties of semimagnetic semiconductors.
Plastic Deformation, Vacancy Diffusion, And Vacancy Delocalization In Bcc 3He, Matthew J. Moelter, M. B. Manning, C. Elbaum
Plastic Deformation, Vacancy Diffusion, And Vacancy Delocalization In Bcc 3He, Matthew J. Moelter, M. B. Manning, C. Elbaum
Physics
The plastic deformation of bcc 3He crystals has been studied near the melting curve, in the temperature range 0.65 K ≤T≤.17 K, and for strain rates, ɛ˙, from 2x10-6 to 2x10-4 sec-1. The resulting relations between strain rate and stress, at a given temperature, are accounted for in terms of dislocation climb and vacancy diffusion in the solid He. The temperature dependence of the strain rate at a given stress indicates that a nonclassical mechanism underlies the deformation process. The vacancy diffusion coefficient in bcc 3He, as a function of temperature, is deduced from …
Biological Effects Of Static Magnetic Fields, Richard B. Frankel
Biological Effects Of Static Magnetic Fields, Richard B. Frankel
Physics
No abstract provided.
Magnetite And Magnetotaxis In Bacteria And Algae, Richard B. Frankel
Magnetite And Magnetotaxis In Bacteria And Algae, Richard B. Frankel
Physics
We are using Mössbauer spectroscopy and magnetic measurements in conjunction with electrochemical, pH and optical spectroscopic measurements to study the mechanisms of iron containing core of these proteins.