Open Access. Powered by Scholars. Published by Universities.®

Physical Sciences and Mathematics Commons™

Open Access. Powered by Scholars. Published by Universities.®

California Polytechnic State University, San Luis Obispo

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 2551 - 2580 of 2725

Full-Text Articles in Physical Sciences and Mathematics

Partitioning General Probability Measures, Theodore P. Hill Apr 1987

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 …

Go to article

Science And Society Test X: Energy Conservation, David W. Hafemeister Apr 1987

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).

Go to article

Binding Of Fe2+ By Mammalian Ferritin, Richard B. Frankel, G. C. Papaefthymiou, G. D. Watt Mar 1987

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.

Go to article

Demountable Piezoelectric Transducer Holder For Use At Low Temperatures, Matthew J. Moelter, M. B. Manning, C. Ebaum Feb 1987

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.

Go to article

The Existence Of Good Markov Strategies For Decision Processes With General Payoffs, Theodore P. Hill, Victor C. Prestien Feb 1987

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.

Go to article

A Generalization Of Lyapounov's Convexity Theorem To Measures With Atoms, John Elton, Theodore P. Hill Feb 1987

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.

Go to article

Operations With Distribution Vectors, Brian Fisher, Todor D. Todorov Jan 1987

Operations With Distribution Vectors, Brian Fisher, Todor D. Todorov

Mathematics

No abstract provided.

Go to article

Expectation Inequalities Associated With Prophet Problems, Theodore P. Hill Jan 1987

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

Go to article

Mössbauer Spectroscopy Of Reduced Ferritin, Richard B. Frankel, G. C. Papaefthymiou, G. D. Watt Jan 1987

Mössbauer Spectroscopy Of Reduced Ferritin, Richard B. Frankel, G. C. Papaefthymiou, G. D. Watt

Physics

No abstract provided.

Go to article

Central California Oak Residue Utilization And Marketing: Better Hardwood Management From Improved Utilization, Timothy G. O'Keefe, Douglas D. Piirto Nov 1986

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 …

Go to article

Effects Of Second Sound On Acoustic Trasmission At The Solid-Liquid 4He Interface, Matthew J. Moelter, M. B. Manning, C. Elbaum Oct 1986

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.

Go to article

Prophet Inequalities For Averages Of Independent Non-Negative Random Variables, Theodore P. Hill Sep 1986

Prophet Inequalities For Averages Of Independent Non-Negative Random Variables, Theodore P. Hill

Research Scholars in Residence

No abstract provided.

Go to article

Rewarding Scientists Who Pursue And Discuss Physics In The Public Interest, David W. Hafemeister, Barbara Levi Aug 1986

Rewarding Scientists Who Pursue And Discuss Physics In The Public Interest, David W. Hafemeister, Barbara Levi

Physics

No abstract provided.

Go to article

Optimal-Partitioning Inequalities For Nonatomic Probability Measures, John Elton, Theodore P. Hill, Robert P. Kertz Aug 1986

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, …

Go to article

Science And Society Test Ix: Technical Means Of Verification, David W. Hafemeister Aug 1986

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).

Go to article

Magnetite And Magnetotaxis In Algae, F. F. Torres De Araujo, M. A. Pires, Richard B. Frankel, C. E. M. Bicudo Aug 1986

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.

Go to article

The Cal Poly House Doctor Lab, David W. Hafemeister Jul 1986

The Cal Poly House Doctor Lab, David W. Hafemeister

Physics

No abstract provided.

Go to article

Magnetic Skeletons In Davy Jones' Locker, Richard B. Frankel Apr 1986

Magnetic Skeletons In Davy Jones' Locker, Richard B. Frankel

Physics

No Abstract.

Go to article

Carrier-Concentration–Induced Ferromagnetism In Pbsnmnte, T. Story, R. R. Galazka, Richard B. Frankel, P. A. Wolff Feb 1986

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.

Go to article

Plastic Deformation, Vacancy Diffusion, And Vacancy Delocalization In Bcc 3He, Matthew J. Moelter, M. B. Manning, C. Elbaum Feb 1986

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 …

Go to article

Magnetite And Magnetotaxis In Bacteria And Algae, Richard B. Frankel Jan 1986

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.

Go to article

Biological Effects Of Static Magnetic Fields, Richard B. Frankel Jan 1986

Biological Effects Of Static Magnetic Fields, Richard B. Frankel

Physics

No abstract provided.

Go to article

Helium-4 Solid-Liquid Interface Mobility And Ultrasonic Energy Absorption Mechanisms, M. B. Manning, Matthew J. Moelter, C. Elbaum Dec 1985

Helium-4 Solid-Liquid Interface Mobility And Ultrasonic Energy Absorption Mechanisms, M. B. Manning, Matthew J. Moelter, C. Elbaum

Physics

The first measurements of acoustic reflection, together with acoustic transmission at the solid-liquid interface of 4He, are used to determine the total relative acoustic energy absorption at the interface as a function of temperature. Based on these results, a new mechanism for the temperature dependence of the kinetics of growth and interface mobility is proposed.

Go to article

A Chronology Of Energy Conservation And Production, David W. Hafemeister Nov 1985

A Chronology Of Energy Conservation And Production, David W. Hafemeister

Physics

No abstract provided.

Go to article

Physics Of Some Environmental Aspects Of Energy, David W. Hafemeister Nov 1985

Physics Of Some Environmental Aspects Of Energy, David W. Hafemeister

Physics

Approximate numerical estimates are carried out on the following environmental effects from energy production and conservation: (1) The greenhouse effect caused by increased CO2 in the atmosphere; (2) Loss of coolant accidents in nuclear reactors; (3) Increased radon concentrations in buildings with very low air infiltration rates; (4) Acid rain from the combustion of fossil fuels; and (5) Explosions of liquified natural gas (LNG).

Go to article

Energy Conservation In Large Buildings, A. Rosenfeld, David W. Hafemeister Nov 1985

Energy Conservation In Large Buildings, A. Rosenfeld, David W. Hafemeister

Physics

As energy prices rise, newly energy aware designers use better tools and technology to create energy efficient buildings. Thus the U.S. office stock (average age 20 years) uses 250 kBTU/ft2 of resource energy, but the guzzler of 1972 uses 500 (up × 2), and the 1986 ASHRAE standards call for 100–125 (less than 25% of their 1972 ancestors). Surprisingly, the first real cost of these efficient buildings has not risen since 1972. Scaling laws are used to calculate heat gains and losses of buildings to obtain the ΔT(free) which can be as large as 15–30 °C (30–60 °F) for …

Go to article

Equipartitioning Common Domains Of Non-Atomic Measures, Theodore P. Hill Sep 1985

Equipartitioning Common Domains Of Non-Atomic Measures, Theodore P. Hill

Research Scholars in Residence

No abstract provided.

Go to article

Emerging Technologies For Verification Of Arms Control Treaties, David W. Hafemeister Aug 1985

Emerging Technologies For Verification Of Arms Control Treaties, David W. Hafemeister

Physics

Progress in the technical means of monitoring to verify compliance to arms control treaties is discussed in the following areas: Real-time surveillance with charge-coupled devices in the visible and infrared; image enhancement with digital 1 image processing and with adaptive optics; imaging with radars based on satellites and on the ground; seismic monitoring with high frequency discrimination and with unattended in-country seismic stations; and nuclear weapons test monitoring with the global positioning satellite system.

Go to article

Reduction Of Mammalian Ferritin, G. D. Watt, Richard B. Frankel, G. C. Papaefthymiou Jun 1985

Reduction Of Mammalian Ferritin, G. D. Watt, Richard B. Frankel, G. C. Papaefthymiou

Physics

Mammalian ferritin from horse spleen undergoes an electrochemical or chemical reduction reaction in which each iron atom present is reduced by one electron (2300 electrons per ferritin molecule containing 2300 Fe3+ ions). Midpoint potentials of -190 mV, -310 mV, and -416 mV were determined at pH 7.0, 8.0, and 9.0. This variation of potential with pH indicates that ≈ 2 H+ are transferred to the core for each Fe3+ reduced to Fe2+. Mössbauer measurements of partially reduced ferritin give spectra that consist of a ferric quadrupole doublet with a superposed ferrous quadrupole doublet. The relative …

Go to article

Wood Of Giant Sequoia: Properties And Unique Characteristics, Douglas D. Piirto May 1985

Wood Of Giant Sequoia: Properties And Unique Characteristics, Douglas D. Piirto

Natural Resources Management and Environmental Sciences

Wood properties of giant sequoia (Sequoia gigantea [Lindl.] Decne.) were compared with those for other coniferous tree species. Wood properties such as specific gravity, various mechanical properties, extractive content, and decay resistance of young-growth giant sequoia are comparable to or more favorable than those of coast redwood (Sequoia sempervirens [D. Don] Endl.). It is recommended that giant sequoia be considered for planting stock in managed production forests to increase future supplies of wood having the characteristics so highly valued in coast redwood and other decay-resistant species

Go to article

First Prev Next Last