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Articles 361 - 390 of 8621
Full-Text Articles in Physical Sciences and Mathematics
Approximating Solutions For Ginzburg – Landau Equation By Hpm And Adm, J. Biazar, M. Partovi, Z. Ayati
Approximating Solutions For Ginzburg – Landau Equation By Hpm And Adm, J. Biazar, M. Partovi, Z. Ayati
Applications and Applied Mathematics: An International Journal (AAM)
In this paper, an analytical approximation to the solution of Ginzburg-Landauis discussed. A Homotopy perturbation method introduced by He is employed to derive the analytic approximation solution and results compared with those of the Adomian decomposition method. Two examples are presented to show the capability of the methods. The results reveal that the methods are almost equally effective and promising.
Exact Solutions Of The Generalized- Zakharov (Gz) Equation By The Infinite Series Method, N. Taghizadeh, M. Mirzazadeh, F. Farahrooz
Exact Solutions Of The Generalized- Zakharov (Gz) Equation By The Infinite Series Method, N. Taghizadeh, M. Mirzazadeh, F. Farahrooz
Applications and Applied Mathematics: An International Journal (AAM)
The infinite series method is an efficient method for obtaining exact solutions of some nonlinear partial differential equations. This method can be applied to nonintegrable equations as well as to integrable ones. In this paper, the direct algebraic method is used to construct new exact solutions of generalized- Zakharov equation.
Application Of Differential Transform Method To The Generalized Burgers–Huxley Equation, J. Biazar, F. Mohammadi
Application Of Differential Transform Method To The Generalized Burgers–Huxley Equation, J. Biazar, F. Mohammadi
Applications and Applied Mathematics: An International Journal (AAM)
In this paper, the differential transform method (DTM) will be applied to the generalized Burgers-Huxley equation, and some special cases of the equation, say, Huxley equation and Fitzhugh-Nagoma equation. The DTM produces an approximate solution for the equation, with few and easy computations. Numerical comparison between differential transform method, Adomian decomposition method and Variational iteration method for Burgers-Huxley, Huxley equation and Fitzhugh-Nagoma equation reveal that differential transform method is simple, accurate and efficient.
On The Eigenvalue And Inertia Problems For Descriptor Systems, Asadollah Aasaraai, Kameleh N. Pirbazari
On The Eigenvalue And Inertia Problems For Descriptor Systems, Asadollah Aasaraai, Kameleh N. Pirbazari
Applications and Applied Mathematics: An International Journal (AAM)
The present study is intended to demonstrate that for a descriptor system with matrix pencil there exists a matrix such that matrix and matrix pencil have the same positive and negative eigenvalues. It is also shown that matrix can be calculated as a contour integral. On the other hand, different representations for matrix are introduced.
Approximate Approach To The Das Model Of Fractional Logistic Population Growth, S. Das, P. K. Gupta, K. Vishal
Approximate Approach To The Das Model Of Fractional Logistic Population Growth, S. Das, P. K. Gupta, K. Vishal
Applications and Applied Mathematics: An International Journal (AAM)
In this article, the analytical method, Homotopy perturbation method (HPM) has been successfully implemented for solving nonlinear logistic model of fractional order. The fractional derivatives are described in the Caputo sense. Using initial value, the explicit solutions of population size for different particular cases have been derived. Numerical results show that the method is extremely efficient to solve this complicated biological model.
Coronary Heart Disease Mortality And Long-Term Exposure To Ambient Particulate Air Pollutants In Elderly Nonsmoking California Residents, Lie Hong Chen
Loma Linda University Electronic Theses, Dissertations & Projects
The purpose of this study is to assess the effect of long-term concentrations of ambient PM on risks of all causes, cardiopulmonary, coronary heart disease (CHD), total cancer, and any mention of nonmalignant respiratory disease (NMRD) mortality.
The health effects of long-term ambient air pollution have been studied with up to 30 years of follow-up in the AHSMOG cohort, a cohort of 6,338 nonsmoking white California adults. Monthly concentrations of ambient air pollutants [particulate matter(PMio), Ozone (O3), sulfur dioxide (SO2), nitrogen dioxide (NO2) or particulate matter
In the AHSMOG cohort, each increment of 10 |ig/m3 in PMio in two-pollutant models …
Effects Of Acculturation On Hiv/Aids Sexual Risk Behaviors Among Asian And Pacific Islander (Api) Women, Margaret Cabotage Salud
Effects Of Acculturation On Hiv/Aids Sexual Risk Behaviors Among Asian And Pacific Islander (Api) Women, Margaret Cabotage Salud
Loma Linda University Electronic Theses, Dissertations & Projects
Background. In the US women are the fastest growing group for sexually transmitted infections (STIs), including HIV and AIDS. In addition, the estimated AIDS cases among female adults and adolescents, aged 13-19, increased from 7% in 1985 to approximately 26% in 2002. Most infections occur by heterosexual transmission with 53% occurring through contact with a high-risk sexual partner. While overall HIV/AIDS rates in the Asian Pacific Islander (API) community remain low, they are rising and HIV testing rates, one of the major prevention strategies for HIV, are lower than that of other populations. Furthermore, very little is known about APIs …
Strategies For Preparing Computer Science Students For The Multicore World, Richard Brown, Elizabeth Shoop, Joel C. Adams, Curtis Clifton
Strategies For Preparing Computer Science Students For The Multicore World, Richard Brown, Elizabeth Shoop, Joel C. Adams, Curtis Clifton
University Faculty Publications and Creative Works
Multicore computers have become standard, and the number of cores per computer is rising rapidly. How does the new demand for understanding of parallel computing impact computer science education? In this paper, we examine several aspects of this question: (i) What parallelism body of knowledge do today's students need to learn? (ii) How might these concepts and practices be incorporated into the computer science curriculum? (iii) What resources will support computer science educators, including non-specialists, to teach parallel computing? (iv) What systemic obstacles impede this change, and how might they be overcome? We address these concerns as an initial framework …
The Möbius Geometry Of Hypersurfaces, Ii, Michael Bolt
The Möbius Geometry Of Hypersurfaces, Ii, Michael Bolt
University Faculty Publications and Creative Works
No abstract provided.
The Möbius Geometry Of Hypersurfaces, Ii, Michael Bolt
The Möbius Geometry Of Hypersurfaces, Ii, Michael Bolt
University Faculty Publications and Creative Works
No abstract provided.
Design And Regioselective Synthesis Of Two And Three-Pronged C60 Fullerene Derivatives And Their Applications In Molecular Electronics, Angy Ortiz-Hernandez
Design And Regioselective Synthesis Of Two And Three-Pronged C60 Fullerene Derivatives And Their Applications In Molecular Electronics, Angy Ortiz-Hernandez
All Dissertations
Since the introduction of semiconductors in the second half of the 20th century, advancements in electronics and technology have been tremendous. In particular, the rapid development of silicon-based computer chip technology and miniaturization of electronic components has been tremendous. Since silicon-based materials have a limit in terms of size, scientists proposed that individual molecules could behave as single electronic components for high degree of miniaturization.
Given that the molecules of interest must have dimensions on the nanometer scale, be able to bind to the electrode surface and have electron donor-acceptor properties, C60 fullerene has been a prime candidate for …
Novel Neomycin Conjugates For Multi-Recognition Of Nucleic Acids, Albert Willis
Novel Neomycin Conjugates For Multi-Recognition Of Nucleic Acids, Albert Willis
All Dissertations
Neomycin is an aminoglycoside antibiotic known for its high affinity for RNA duplex structures. Recent developments from our labs have indicated that aminoglycoside binding is not limited to RNA, but to nucleic acids that, like RNA, adopt conformations similar to A-form. Our group sought to further expand the utility of aminoglycoside binding to B-DNA structures by conjugating neomycin, an aminoglycoside antibiotic, with the B-DNA minor groove binding ligand Hoechst 33258. Envisioning a dual groove-binding mode, we have extended the potential recognition process to include a third, intercalative moiety. Furthermore, we observe remarkable recognition of such conjugates with RNA duplex. Spectroscopic …
Approximation Algorithms For Network Interdiction And Fortification Problems, Adam Whitley
Approximation Algorithms For Network Interdiction And Fortification Problems, Adam Whitley
All Dissertations
This dissertation discusses algorithms and results on several NP–hard graph problems which can all be classified as network interdiction and network fortification problems.
The first problem studied, the multiway cut problem, is a generalization of the well–studied s–t min–cut problem, in which we must remove a minimum–cost subset of edges from a graph so that r > 2 designated terminals become disconnected from each other. We investigate an approximation algorithm for general r with a relatively simple analysis guaranteeing an approximation ratio ≤ 1.4647 − epsilonr, where epsilonr is a small constant related to the number of terminals …
Poly (Acrylonitrile-Co-1-Vinylimidazole): A New Melt Processable Carbon Fiber Precursor, Wenjin Deng
Poly (Acrylonitrile-Co-1-Vinylimidazole): A New Melt Processable Carbon Fiber Precursor, Wenjin Deng
All Dissertations
Carbon fiber polymer composites have attracted worldwide interest in sporting goods and aerospace industries due to their excellent specific strength, stiffness and lightweight. The replacement of solution-spinning process by melt-spinning process is one of the major approaches to make cost effective carbon fiber. In recent years, researchers have explored the possibilities to synthesize melt processable carbon fiber precursors, but their thermal stabilization is still a challenge. The goal for this research project is to prepare melt processable carbon fiber precursors which have the capability of thermal stabilization. Acrylonitrile/1-vinylimidazole (AN/VIM) copolymers containing various mol% of VIM were synthesized by free radical …
Gamma Ray Bursts As Probes Of Dust In The Evolving Universe, Adria Updike
Gamma Ray Bursts As Probes Of Dust In The Evolving Universe, Adria Updike
All Dissertations
Dust is ubiquitous in the universe. Understanding where it comes from and where we observe it can have major implications to all astronomical observations. In this study, we investigate how gamma ray bursts (GRBs) can be used as probes of dust in the evolving universe. Making the simplification that silicate dust comes from core collapse supernovae and that graphite dust is produced in the winds of low- to intermediate-mass stars, we present numerical simulations of the resulting dust evolution in GRB hosts and show how the SEDs evolve. Dust extinction laws are re-derived from scattering theory of small particles and …
Synthesis And Optical Properties Of Silver Nanostructures, John Heckel
Synthesis And Optical Properties Of Silver Nanostructures, John Heckel
All Dissertations
Silver nanoparticles interact with light via the excitation of plasmon resonances that are the collective oscillations of the free electron density. This excitation represents the most efficient mechanism for the interaction of light with matter and therefore the nanoparticles are of great interest for both fundamental and practical points of view. In the following dissertation, silver nanoparticles, core-shell nanoparticles, and silver nanoparticle clusters were synthesized and there optical properties were investigated.
Chapter 1 contains general background information about the optical properties of bulk and silver nanoparticles. It also contains a concise description of two of my collaborative projects that did …
Batch Testing, Adaptive Algorithms, And Heuristic Applications For Stable Marriage Problems, John Dabney
Batch Testing, Adaptive Algorithms, And Heuristic Applications For Stable Marriage Problems, John Dabney
All Dissertations
In this dissertation we focus on different variations of the stable matching (marriage) problem, initially posed by Gale and Shapley in 1962. In this problem, preference lists are used to match n men with n women in such a way that no (man, woman) pair exists that would both prefer each other over their current partners. These two would be considered a blocking pair, preventing a matching from being considered stable. In our research, we study three different versions of this problem.
First, we consider batch testing of stable marriage solutions. Gusfield and Irving presented an open problem in their …
Synthesis Of Trimetallic Nitride Endohedral Metallofullerene Derivatives For Enhanced Solar Energy Conversion, Julio Pinzon Joya
Synthesis Of Trimetallic Nitride Endohedral Metallofullerene Derivatives For Enhanced Solar Energy Conversion, Julio Pinzon Joya
All Dissertations
The preparation and electrochemical properties of donor - acceptor systems based on trimetallic nitride endohedral metallofullerenes (TNT-EMFs) for enhanced solar energy conversion is described. It was found that TNT-EMFs have an enhanced ability to stabilize charge separated states formed upon light irradiation when compared to empty cage fullerene analogues. The influence of the linker connecting the donor and acceptor moieties was studied in two different systems. Optimal conditions for preparing cyclopropanated Bingel-Hirsch derivaties of the most common TNT-EMFs were found; this functionalization approach is a very useful alternative to the 1,3-dipolar cycloaddition reactions that yield pyrrolidine derivatives, because the latter …
Uncertainty Of Dimensional Measurments Obtained From Self-Initialized Instruments, Vincent Lee
Uncertainty Of Dimensional Measurments Obtained From Self-Initialized Instruments, Vincent Lee
All Dissertations
Precision dimensional measurement instruments often contain sensors that can only measure displacement of a moving body from some reference position. In order to measure the length of an object they often require a calibrated artifact to initialize their measurement sensors so that they may provide an absolute measurement instead of displacement. Instruments which can realize a null value, i.e. zero length, don't require one; however instruments which can't need to reference an object of known size. These calibration artifacts also serve as part of the chain of metrological traceability.
The group of instruments presented in this dissertation can self-initialize by …
Evolutionary Strategies For Data Mining, Rose Lowe
Evolutionary Strategies For Data Mining, Rose Lowe
All Dissertations
Learning classifier systems (LCS) have been successful in generating rules for solving classification problems in data mining. The rules are of the form IF condition THEN action. The condition encodes the features of the input space and the action encodes the class label. What is lacking in those systems is the ability to express each feature using a function that is appropriate for that feature. The genetic algorithm is capable of doing this but cannot because only one type of membership function
is provided. Thus, the genetic algorithm learns only the shape and placement of the membership function, and in …
Late Holocene Relationships Among Fire, Climate, And Vegetation In Rangeland Ecosystems Of Southwestern Idaho, Nathan A. Nelson, Jennifer Pierce
Late Holocene Relationships Among Fire, Climate, And Vegetation In Rangeland Ecosystems Of Southwestern Idaho, Nathan A. Nelson, Jennifer Pierce
Geosciences Faculty Publications and Presentations
Rangelands are characterized by more arid climates than forested regions; therefore, establishing fire histories using traditional methods (e.g. fire-scars from trees or charcoal in lake sediments) is problematic. This study uses radiocarbon dating of charcoal preserved in alluvial fans and stream deposits to reconstruct a record of fire and geomorphic response in rangelands of southwestern Idaho. Samples indicate three primary periods of fire-related activity: 4400 – 4000, 2000 – 1400, and 650-400 cal yr BP. Charcoal macrofossil identification and comparison with other regional climate and fire records indicate this area has likely switched between a "fuel-limited" system (fires limited by …
Reference Priors For Exponential Families With Increasing Dimension, Bertrand Clarke, Subhashis Ghosal
Reference Priors For Exponential Families With Increasing Dimension, Bertrand Clarke, Subhashis Ghosal
Department of Statistics: Faculty Publications
In this article, we establish the asymptotic normality of the posterior distribution for the natural parameter in an exponential family based on independent and identically distributed data. The mode of convergence is expected Kullback-Leibler distance and the number of parameters p is increasing with the sample size n. Using this, we give an asymptotic expansion of the Shannon mutual information valid when p = pm increases at a sufficiently slow rate. The second term in the asymptotic expansion is the largest term that depends on the prior and can be optimized to give Jeffrey's prior as the reference prior in …
What Brown Saw And You Can Too, Philip Pearle, Brian Collett, Kenneth Bart, David Bilderback, Dara Newman, D. Scott Samuels
What Brown Saw And You Can Too, Philip Pearle, Brian Collett, Kenneth Bart, David Bilderback, Dara Newman, D. Scott Samuels
Biological Sciences Faculty Publications
A discussion of Robert Brown’s original observations of particles ejected by pollen of the plant Clarkia pulchella undergoing what is now called Brownian motion is given. We consider the nature of those particles and how he misinterpreted the Airy disk of the smallest particles to be universal organic building blocks. Relevant qualitative and quantitative investigations with a modern microscope and with a “homemade” single lens microscope similar to Brown’s are presented.
Coercivity And Exchange Bias Of Mn0.25ti1.1s2 In The Cluster-Glass State, P. M. Shand, T. Rash, M. Streicher, T. E. Kidd, K. R. Boyle, Laura Strauss
Coercivity And Exchange Bias Of Mn0.25ti1.1s2 In The Cluster-Glass State, P. M. Shand, T. Rash, M. Streicher, T. E. Kidd, K. R. Boyle, Laura Strauss
Faculty Publications
Magnetic measurements have been carried out on the Mn-intercalated transition-metal dichalcogenide Mn0.25Ti1+yS2. The material, which contained a concentration y≈0.1 of excess intercalated Ti, exhibited paramagnetic behavior at high temperatures with an effective moment per Mn ion of µeff=6.07 ± 0.23 µB, which shows that the system comprises localized Mn2+ moments. A Curie-Weiss temperature ΘCW=-26 ± 1 K indicated that antiferromagnetic interactions were dominant. Deviation from Curie-Weiss behavior below 100 K signaled the formation of antiferromagnetically correlated clusters. Bifurcation of the zero-fieldcooled and field-cooled magnetizations below 20 K …
Direct Observation Of Spin-Polarized Surface States In The Parent Compound Of A Topological Insulator Using Spin- And Angle-Resolved Photoemission Spectroscopy In A Mott-Polarimetry Mode, David Hsieh, Lewis Andrew Wray, Dong Qian, Yuqi Xia, Jan Hugo Dil, Fabian Meier, Luc Patthey, Jurg Osterwalder, Gustav Bihlmayer, Yew San Hor, Robert Joseph Cava, Md Zahid Hasan
Direct Observation Of Spin-Polarized Surface States In The Parent Compound Of A Topological Insulator Using Spin- And Angle-Resolved Photoemission Spectroscopy In A Mott-Polarimetry Mode, David Hsieh, Lewis Andrew Wray, Dong Qian, Yuqi Xia, Jan Hugo Dil, Fabian Meier, Luc Patthey, Jurg Osterwalder, Gustav Bihlmayer, Yew San Hor, Robert Joseph Cava, Md Zahid Hasan
Physics Faculty Research & Creative Works
We report high-resolution spin-resolved photoemission spectroscopy (spin-ARPES) measurements on the parent compound Sb of the recently discovered three-dimensional topological insulator Bi1-xSbx (Hsieh et al 2008 Nature 452 970, Hsieh et al 2009 Science 323 919). By modulating the incident photon energy, we are able to map both the bulk and the (111) surface band structure, from which we directly demonstrate that the surface bands are spin polarized by the spin-orbit interaction and connect the bulk valence and conduction bands in a topologically non-trivial way. A unique asymmetric Dirac surface state gives rise to a k-splitting of its …
Reaction Dynamics In Double Ionization Of Helium By Electron Impact, Marcelo F. Ciappina, Michael Schulz, Tom Kirchner
Reaction Dynamics In Double Ionization Of Helium By Electron Impact, Marcelo F. Ciappina, Michael Schulz, Tom Kirchner
Physics Faculty Research & Creative Works
We present theoretical fully differential cross sections (FDCS) for double ionization of helium by 500 eV and 2 keV electron impact. Contributions from various reaction mechanisms to the FDCS were calculated separately and compared to experimental data. Our theoretical methods are based on the first Born approximation. Higher-order effects are incorporated using the Monte Carlo event generator technique. Earlier, we successfully applied this approach to double ionization by ion impact, and in the work reported here it is extended to electron impact. We demonstrate that at 500 eV impact energy, double ionization is dominated by higher-order mechanisms. Even at 2 …
Policy And Science Of Geothermal Heat Use At Mcmurdo Station, Antarcrtica, Joe Alvine
Policy And Science Of Geothermal Heat Use At Mcmurdo Station, Antarcrtica, Joe Alvine
Department of Environmental Studies: Undergraduate Student Theses
My thesis research project deals with the use of geothermal heat in Antarctica. Currently it is not allowed due to article 7 of the 1991 Protocol on Environmental Protection that placed a 50 moratorium on the exploitation of mineral resources. The US main base in Antarctica, McMurdo Station is currently powered by diesel generators that are inefficient, cause environmental damage, and is expensive to run. By exploring alternative energy options, McMurdo Station can reduce its dependence on non-renewable energy sources. By determining the geothermal potential of McMurdo Station, this project explores the possibilities and benefits that would occur with the …
Does Socio/Economic Status Affect Environmental Awarness In Elementary School Children Interacting With School Gardens?, Grady C. Erickson
Does Socio/Economic Status Affect Environmental Awarness In Elementary School Children Interacting With School Gardens?, Grady C. Erickson
Department of Environmental Studies: Undergraduate Student Theses
This is a case study involving three elementary schools in the greater Lincoln, Nebraska area. These schools were chosen to provide insight to three different economic backgrounds. Saratoga and Randolph from Lincoln Public Schools, and Norris Elementary part of Norris Public Schools 160 was the third school involved in the study. This case study focused on seeing whether socio/economic background had any effect on environmental awareness. To do so, surveys were handed out to each school to help measure environmental awareness. These surveys also helped determine where the environmental literacy standards were in the elementary schools of Lincoln, Nebraska. The …
The Effect Of Enso On Nebraska Winter Snowfall, Jonathan Burnham
The Effect Of Enso On Nebraska Winter Snowfall, Jonathan Burnham
Department of Environmental Studies: Undergraduate Student Theses
No abstract provided.
Communication For Mate Selection In Anurans: Dominant Frequency Versus Snout-Vent-Length, Shari Jean Kunert
Communication For Mate Selection In Anurans: Dominant Frequency Versus Snout-Vent-Length, Shari Jean Kunert
Department of Environmental Studies: Undergraduate Student Theses
No abstract provided.