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Articles 1681 - 1710 of 2193
Full-Text Articles in Physical Sciences and Mathematics
Failure To Observe Electron Circular Dichroism In Camphor, K. W. Trantham, M. E. Johnston, Timothy J. Gay
Failure To Observe Electron Circular Dichroism In Camphor, K. W. Trantham, M. E. Johnston, Timothy J. Gay
Timothy J. Gay Publications
We have searched for evidence of electron circular dichroism, the preferential
transmission of longirudinally polarized electrons lhrough a chiral medium, using stereoisomers of camphor. Such an effect was seen by Campbell and Farago in 1987 for 5 eV elecvons. Within our detection limit (~0.02%) we have not observed asymmehic transmission at either an incident electron energy of 1 eV or 5 eV. ln preparation for this inquiry, we also measured the total scattering cross section for camphor in the energy range 0.5-5 eV.
Ocean Biogeochemical Fluxes - New Production And Export Of Organic-Matter From The Upper Ocean, Hw Ducklow
Ocean Biogeochemical Fluxes - New Production And Export Of Organic-Matter From The Upper Ocean, Hw Ducklow
VIMS Articles
Studies of ocean biogeochemical fluxes have been energized in this decade, by the urgency of our need to understand and predict the effects of continued CO2accumulation in the atmosphere, by the global perspectives offered by satellite views of ocean color and related physical fields (McClain et al. 1991; Yoder et al. 1992; Mitchell 1994), and by the successful implementation of the Joint Global Ocean Flux Study (JGOFS; Bowles and Livingston, 1993). In this review, I focus on oceanic new production, originally defined as the fraction of primary production supported by inputs of ‘new’ nitrogen from outside the euphotic …
Organochlorine Pesticide Residues In The Neotropical Migratory Passerine Birds, Birthe Borup
Organochlorine Pesticide Residues In The Neotropical Migratory Passerine Birds, Birthe Borup
Honors Projects
In 1874 Othmar Ziedlert a German chemist was working on the synthesis and characterization of substituted aromatic hydrocarbons. In the process of his work he synthesized dichloro-diphenyl-trichloro-ethane commonly known as DDT. It was not until 1930 that its use as an insecticide was detected by Paul Muller who found that it was effective against potato beetles (Leptinotarsal declineata) and clothes moths, (Tineola besselliella ) (Dunlap 1981). Pure DDT is a white crystalline solid with a melting point of 109 C, and a vapor pressure of 0.025mPa at 20 C. Technical grade DDT is a white amorphous powder, consisting of a …
On Some Cave Minerals From Northern Norway, Bogdan Petroniu Onac, Stein-Erik Lauritzen
On Some Cave Minerals From Northern Norway, Bogdan Petroniu Onac, Stein-Erik Lauritzen
International Journal of Speleology
The present paper aims to point out the results of 31 samples from some Norwegian caves that have been analysed with respect to their mineralogical composition. Identification of the minerals was done by X-ray diffraction, thermal, infrared spectroscopy and scanning electron microscopy. Seventeen minerals were identified belonging to 4 groups: carbonates, sulphates, oxides-hydroxides and silicates.
Analysis Of A Recurrence Arising From A Construction For Nonblocking Networks, Nicholas Pippenger
Analysis Of A Recurrence Arising From A Construction For Nonblocking Networks, Nicholas Pippenger
All HMC Faculty Publications and Research
Define f on the integers n > 1 by the recurrence f(n) = min( n, minm|n( 2f(m) + 3f(n/m) ). The function f has f(n) = n as its upper envelope, attained for all prime n.
The goal of this paper is to determine the corresponding lower envelope. It is shown that this has the form f(n) ~ C(log n)1 + 1/γ for certain constants γ and C, in the sense that for any ε > 0, the inequality f(n) ≤ (C + ε)(log n)1 + 1/γ holds for infinitely many n, while f(n) ≤ (C + ε)(log …
Optimal Klappenspiel, Arthur T. Benjamin, Derek Stanford '93
Optimal Klappenspiel, Arthur T. Benjamin, Derek Stanford '93
All HMC Faculty Publications and Research
The game Klappenspiel ("flipping game") is a traditional German game of flipping tiles according to dice rolls. In this paper, we derive the optimal strategy for this game by using dynamic programming. We show that the probability of winning using the optimal strategy is 0.30%.
Student Evaluations Of Teaching Effectiveness: The Interpretation Of Observational Data And The Principle Of Faute De Mieux, B. Burt Gerstman
Student Evaluations Of Teaching Effectiveness: The Interpretation Of Observational Data And The Principle Of Faute De Mieux, B. Burt Gerstman
Faculty Publications
Student opinion surveys are important but widely misunderstood tools for evaluating teaching effectiveness. In this brief review, an analogy is drawn between the use and interpretation of observational data for public health and biomedical research and the use of student opinion data in evaluating teach ing effectiveness. Sources of systematic error in the form of selection bias, information bias, and confounding are defined and illustrated. Original data concerning intermittent "quid pro quo" confounding (i.e., the effect of expected grades on student evaluations of teaching) are presented. Finally, the principle of faute de mieux ("lack of anything better") and the interpretation …
Analysis Of A Recurrence Arising From A Construction For Non-Blocking Networks, Nicholas Pippenger
Analysis Of A Recurrence Arising From A Construction For Non-Blocking Networks, Nicholas Pippenger
All HMC Faculty Publications and Research
Define f on the integers $n > 1$ by the recurrence $f( n ) = \min \{ n,\min _{m|n} 2f( m ) + 3f( n/m ) \}$. The function f has $f( n ) = n$ as its upper envelope, attained for all prime n. The goal of this paper is to determine the corresponding lower envelope. It is shown that this has the form $f( n ) \sim C( \log n )^{1 + 1/\gamma } $ for certain constants $\gamma $ and C, in the sense that for any $\varepsilon > 0$, the inequality $f( n ) \leq ( …
Femtosecond Laser-Produced Plasma X-Rays From Periodically Modulated Surface Targets, J. C. Gautheir, S. Bastiani, P. Audebert, J. P. Geindre, K. Neuman, Thomas D. Donnelly, M. Hoffer, R. W. Falcone, R. Shepherd, D. Price, B. White
Femtosecond Laser-Produced Plasma X-Rays From Periodically Modulated Surface Targets, J. C. Gautheir, S. Bastiani, P. Audebert, J. P. Geindre, K. Neuman, Thomas D. Donnelly, M. Hoffer, R. W. Falcone, R. Shepherd, D. Price, B. White
All HMC Faculty Publications and Research
We have studied theoretically and experimentally the x-ray production above 1 keV from femtosecond laser plasmas generated on periodically modulated surface targets. Laser energy coupling to plasma surface waves has been modeled using a numerical differential method. Almost total absorption of incident laser radiation is predicted for optimized interaction conditions. Silicon gratings have been irradiated by a 120fs Ti:sapphire laser at irradiances in excess of 1016 W/cm2. X-ray intensities above 1.5 keV (K-shell lines) have been measured as a function of the incidence angle. Results show a distinct x-ray emission maximum for the first order diffraction …
Theoretical Study Of Solvent Effects On The Electronic Coupling Element In Rigidly Linked Donor-Acceptor Systems, Robert J. Cave, Marshall D. Newton, Krishna Kumar, Matthew B. Zimmt
Theoretical Study Of Solvent Effects On The Electronic Coupling Element In Rigidly Linked Donor-Acceptor Systems, Robert J. Cave, Marshall D. Newton, Krishna Kumar, Matthew B. Zimmt
All HMC Faculty Publications and Research
The recently developed generalized Mulliken-Hush approach for the calculation of the electronic coupling matrix element for electron-transfer processes is applied to two rigidly linked donor-bridge-acceptor systems having dimethoxyanthracene as the donor and a dicarbomethoxycyclobutene unit as the acceptor. The dependence of the electronic coupling matrix element as a function of bridge type is examined with and without solvent molecules present. For clamp-shaped bridge structures solvent can have a dramatic effect on the electronic coupling matrix element. The behavior with variation of solvent is in good agreement with that observed experimentally for these systems.
Chemical And Biological Monitoring Of A Constructed Wetland On Jones Branch Treating Acid Mine Drainage, Barbara A. Ramey, George Chalfant, Jon A. Walker
Chemical And Biological Monitoring Of A Constructed Wetland On Jones Branch Treating Acid Mine Drainage, Barbara A. Ramey, George Chalfant, Jon A. Walker
KWRRI Research Reports
Acid mine drainage (AMD) from an abandoned underground coal mine in the Jones Branch watershed in McCreary County, KY, substantially reduced water quality in Jones Branch. Downstream from the mine seeps, the pH was routinely below 4.5 and concentrations of most heavy metals, especially iron, were elevated. A cattail wetland (1,022 m2) was constructed on Jones Branch in 1988-1989 to obviate the effects of the AMD. Monthly chemical monitoring was performed on the water from above, from below, from the inlet and outlet of the wetland, and from the 25 cells within the wetland. Based on chemical monitoring, …
Environmental Action Projects Involving Middle School Students, Mark Toney
Environmental Action Projects Involving Middle School Students, Mark Toney
Theses Digitization Project
No abstract provided.
A Review Of Research And Literature Linking Breast Cancer To Pesticides, Patricia L. Pellegrino-Peard
A Review Of Research And Literature Linking Breast Cancer To Pesticides, Patricia L. Pellegrino-Peard
Theses Digitization Project
No abstract provided.
Birds Associated With Blackbird Spring Feeding Sites In South Dakota, George M. Linz, David L. Bergman, William J. Bleier
Birds Associated With Blackbird Spring Feeding Sites In South Dakota, George M. Linz, David L. Bergman, William J. Bleier
United States Department of Agriculture Wildlife Services: Staff Publications
From 2 to 16 April 1993, we conducted road-side surveys of birds using harvested fields of small grains, soybeans, and wm within 8 km of two blackbird roosts in east central South Dakota. Blackbirds, waterfowl, killdeer, homed larks, ring-necked pheasants, and western meadowlarks were the most common buds recorded. The frequencies of blackbirds, non-game birds, terrestrial game birds, and waterfowl was not equally distributed within the three habitats (P = 0.U.23).
Free Α-Oxiranyl Amino Acids, David B. Berkowitz, Michelle L. Pedersen
Free Α-Oxiranyl Amino Acids, David B. Berkowitz, Michelle L. Pedersen
David Berkowitz Publications
Analogues of natural amino acids, in which the α-proton is replaced by an unsubstituted epoxide ring, are potential mechanism-based inhibitors for pyridoxal phosphate dependent enzymes.1 Yet, free α-oxiranyl amino acids have remained elusive until now. The synthesis of an α-(phenyl-substituted)oxiranyl amino ester has been reported. However, the accessibility and stability of the corresponding free, zwitterionic α-oxiranyl amino acid remained an open question.9
Canadian Cooperative Wildlife Health Centre, Volume 3-3, Winter 1995
Canadian Cooperative Wildlife Health Centre, Volume 3-3, Winter 1995
Canadian Cooperative Wildlife Health Centre: Newsletters and Publications
Loon Survey to Continue in 1996 on a Fully National Scale Meet More CCWHC Staff Waterfowl Die-off in Mexico Newcastle Disease in Double-crested Cormorants - Summer 1995 The Northward March of Raccoon Rabies - Update Rabbit Viral Hemorrhagic Disease on the Loose in Australia Verminous pneumonia in red foxes Common Loons: Complex Causes of Mortality Parvovirus in Raccoons Giardia in Voles Beluga Whales in the St Lawrence Estuary Insecticide Poisoning in Robins Emaciated Great Horned Owls Parvovirus and Trichinosis in Urban Raccoons Botulism At Pakowki Lake, 1995 The Case of the Killer Cookies: Apparent Chocolate Poisoning of Gulls Unusual Mortality …
The Composition Of Operator-Valued Measurable Functions Is Measurable, Albert Badrikian, G. W. Johnson, Il Yoo
The Composition Of Operator-Valued Measurable Functions Is Measurable, Albert Badrikian, G. W. Johnson, Il Yoo
Department of Mathematics: Faculty Publications
Given separable Frechet spaces, E, F , and G , let L(E, F), L(F, G), and L(E, G) denote the space of continuous linear operators from E to F , F to G, and E to G, respectively. We topologize these spaces of operators by any one of a family of topologies including the topology of point-wise convergence and the topology of compact convergence. We will show that if (X, F) is any measurable space and both A: X → L(E, F) and B: X → L(F, G) are Borelian, then the operator composition BA: X → L(E, G) is …
Generalized Geynman Integrals: The 𝓛(L2, L2) Theory, Chull Park, David Skough
Generalized Geynman Integrals: The 𝓛(L2, L2) Theory, Chull Park, David Skough
Department of Mathematics: Faculty Publications
In this paper we develop an 𝓛(L2(R), L2(R)) theory for the Feynman integral of functionals of general stochastic processes.
Temporary Negative-Ion States Of Na, K, Rb, And Cs, A.R. Johnston, Paul Burrow
Temporary Negative-Ion States Of Na, K, Rb, And Cs, A.R. Johnston, Paul Burrow
Paul Burrow Publications
Electron-transmission spectroscopy is used to observe structure in the electron-scattering cross section associated with the formation of temporary negative ions and channel-opening effects. A strong ‘‘family’’ resemblance is apparent among the resonances of the alkali metals. From published calculations and angular scattering studies, the lower-lying features are known with some confidence. Based on these, plausible assignments for some of the higher-lying resonances are put forth. We propose that the absence of resonances near the Cs 5 2D and possibly the Na 4 2P and 5 2P thresholds is associated with the negative polarizabilities of these excited states.
Nonlinear Temporal Diffraction And Frequency Shifts Resulting From Pulse Shaping In Chirped-Pulse Amplification Systems, X Liu, R Wagner, Anatoly Maksimchuk, E Goodman, J Workman, Donald P. Umstadter, A Migus
Nonlinear Temporal Diffraction And Frequency Shifts Resulting From Pulse Shaping In Chirped-Pulse Amplification Systems, X Liu, R Wagner, Anatoly Maksimchuk, E Goodman, J Workman, Donald P. Umstadter, A Migus
Donald Umstadter Publications
We present experimental results of the amplif ication of strongly amplitude-modulated chirped pulses resulting from the coherent addition of two delayed short pulses. The nonlinearities in the amplifier chain induce a temporal diffraction resulting in prepulses and postpulses, in addition to the two main pulses when compressed. Simultaneously, temporal-resolved and spectral-resolved output pulses show that the prepulses and postpulses are blue shifted and red shifted, respectively, explaining the causality of the system.
Effects Of Track Structure And Cell Inactivation On The Calculation Of Heavy Ion Mutation Rates In Mammalian Cells, Francis A. Cucinotta, J. W. Wilson, M. R. Shavers, Robert Katz
Effects Of Track Structure And Cell Inactivation On The Calculation Of Heavy Ion Mutation Rates In Mammalian Cells, Francis A. Cucinotta, J. W. Wilson, M. R. Shavers, Robert Katz
Robert Katz Publications
It has long been suggested that inactivation severely effects the probability of mutation by heavy ions in mammalian cells. Heavy ions have observed cross sections of inactivation that approach and sometimes exceed the geometric size of the cell nucleus in mammalian cells. In the track structure model of Katz the inactivation cross section is found by summing an inactivation probability over all impact parameters from the ion to the sensitive sites within the cell nucleus. The inactivation probability is evaluated using the dose-response of the system to γ-rays and the radial dose of the ions and may be equal to …
Dynamic Phase Steepening In Alfven Waves, Stephen R. Granade
Dynamic Phase Steepening In Alfven Waves, Stephen R. Granade
Honors Theses
Our solar system contains more activity and complexity than can be seen through a telescope. One such "invisible" phenomenon is the solar wind, created by a steady stream of particles blasted away from the sun in all directions. The sun's donut-shaped magnetic field lines channel this stream. Particles moving along the field lines perform an intricate helical dance, with ions winding one way and electrons the other.
The solar wind shapes and is shaped by the magnetic fields of the planets and the sun. If left undisturbed by outside influences, the earth's magnetic field, like the sun's, would resemble a …
Using Neural Networks For Aerodynamic Parameter Modeling, Gerald E. Peterson, William E. Bond, Roger Germann, Barry Streeter, James Urnes
Using Neural Networks For Aerodynamic Parameter Modeling, Gerald E. Peterson, William E. Bond, Roger Germann, Barry Streeter, James Urnes
Computer Science Faculty Research & Creative Works
Neural networks are being developed at McDonnell Douglas Corporation to provide an onboard model of an aircraft's aerodynamics to support advanced flight control systems. These flight control systems, constructed using neural networks and advanced controllers, have the potential to reduce flight control development costs and to improve inflight performance. Neural networks are useful in this situation because they can compactly represent the data and operate in real-time
Using Fuzzy Set Theory: Exploring How Generalties Can Pinpoint Where To Look For The Answers, Cosmin Radu, Ralph W. Wilkerson
Using Fuzzy Set Theory: Exploring How Generalties Can Pinpoint Where To Look For The Answers, Cosmin Radu, Ralph W. Wilkerson
Computer Science Faculty Research & Creative Works
No abstract provided.
Differences In Wintering Areas Of Snowy Plovers From Inland Breeding Sites In Western North America, Gary W. Page, Mark A. Stern, Peter W. C. Paton
Differences In Wintering Areas Of Snowy Plovers From Inland Breeding Sites In Western North America, Gary W. Page, Mark A. Stern, Peter W. C. Paton
Natural Resources Science Faculty Publications
No abstract provided.
Using Taguchi''S Method Of Experimental Design To Control Errors In Layered Perceptrons, William E. Bond, Gerald E. Peterson, Daniel C. St. Clair, Stephen R. Aylward
Using Taguchi''S Method Of Experimental Design To Control Errors In Layered Perceptrons, William E. Bond, Gerald E. Peterson, Daniel C. St. Clair, Stephen R. Aylward
Computer Science Faculty Research & Creative Works
A significant problem in the design and construction of an artificial neural network for function approximation is limiting the magnitude and the variance of errors when the network is used in the field. Network errors can occur when the training data does not faithfully represent the required function due to noise or low sampling rates, when the network's flexibility does not match the variability of the data, or when the input data to the resultant network is noisy. This paper reports on several experiments whose purpose was to rank the relative significance of these error sources and thereby find neural …
Determination And Use Of Rohrschneider-Mcreynolds Constants For Chiral Stationary Phases Used In Capillary Gas Chromatography, Alain Berthod, Eve Yiwen Zhou, Kang Le, Daniel W. Armstrong
Determination And Use Of Rohrschneider-Mcreynolds Constants For Chiral Stationary Phases Used In Capillary Gas Chromatography, Alain Berthod, Eve Yiwen Zhou, Kang Le, Daniel W. Armstrong
Chemistry Faculty Research & Creative Works
The overall polarity of 22 chiral stationary phases (CSPs) used in capillary open tubular gas chromatography columns was estimated using the first five Rohrschneider-McReynolds constants. Most of the columns (i.e., 18) were wall-coated, and four were of the wall-immobilized or of the so-called "bonded" type. A wall-coated capillary squalane column was specially prepared as a polarity reference column. All but two of the CSPs were based on derivatized cyclodextrins (CDs) of different sizes. The overall properties of the CSPs are discussed in terms of the five Rohrschneider-McReynolds constants and their average values. It was found that the derivatized cyclodextrin CSP …
Adaptive Resonance Theory (Art): An Introduction, Lucien G. Heins, Daniel R. Tauritz
Adaptive Resonance Theory (Art): An Introduction, Lucien G. Heins, Daniel R. Tauritz
Computer Science Faculty Research & Creative Works
No abstract provided.
Relaxing Synchronization In Distributed Simulated Annealing, Bruce M. Mcmillin, Chul-Eui Hong
Relaxing Synchronization In Distributed Simulated Annealing, Bruce M. Mcmillin, Chul-Eui Hong
Computer Science Faculty Research & Creative Works
This paper presents a cost error measurement scheme and relaxed synchronization method, for simulated annealing on a distributed memory multicomputer, which predicts the amount of cost error that an algorithm will tolerate. An adaptive error control method is developed and implemented on an Intel iPSC/2
Resource Law Notes Newsletter, No. 33, Winter Issue, Jan. 1995, University Of Colorado Boulder. Natural Resources Law Center
Resource Law Notes Newsletter, No. 33, Winter Issue, Jan. 1995, University Of Colorado Boulder. Natural Resources Law Center
Resource Law Notes: The Newsletter of the Natural Resources Law Center (1984-2002)
No abstract provided.