Physical Sciences and Mathematics Commons^™

Education About The Environment Discover Mojave Programs, Public Lands Institute

Presentations (PLI Education)

Increases people’s knowledge and awareness about the environment and associated challenges, develops the necessary skills and expertise to address the challenges, and fosters attitudes, motivations, and commitments to make informed decisions and take responsible action” (UNESCO, Tbilisi Declaration, 1978)

Connecting Hearts, Minds, & Hands To Public Lands, Public Lands Institute

Presentations (PLI)

The Public Lands Institute is dedicated to strengthening the national fabric that is essential for the protection, conservation, and management of public lands.

Best Practices In Multi-Agency Volunteer Programs, Lanelda Rolley, Donna Grady, Chuck Williams

Interagency Science and Research Strategy

• Strengthen the national fabric in support of public lands.

• Provide people of all ages with opportunities to participate in the enjoyment, protection, and responsible use of our public lands.

Conservation Element Of The Las Vegas 2020 Master Plan, City Of Las Vegas, Nevada

Publications (SD)

There is a dual purpose to the Las Vegas 2020 Master Plan Conservation Element. The first purpose is to address the requirements of state law, as provided in the Nevada Revised Statutes (NRS) 278.150(4). This section of the NRS requires that governing bodies in Nevada counties with a population of 400,000 or more ensure that their master plans address a stipulated list of subjects, including a conservation plan.

A Regularized And Renormalized Electrostatic Coupling Hamiltonian For Hybrid Quantum-Mechanical–Molecular-Mechanical Calculations, Pradip K. Biswas, Valentin Gogonea

Chemistry Faculty Publications

We describe a regularized and renormalized electrostatic coupling Hamiltonian for hybrid quantum-mechanical (QM)–molecular-mechanical (MM) calculations. To remedy the nonphysical QM/MM Coulomb interaction at short distances arising from a point electrostatic potential (ESP) charge of the MM atom and also to accommodate the effect of polarized MM atom in the coupling Hamiltonian, we propose a partial-wave expansion of the ESP charge and describe the effect of a s-wave expansion, extended over the covalent radius rc, of the MM atom. The resulting potential describes that, at short distances, large scale cancellation of Coulomb interaction arises intrinsically from the localized expansion of the …

Potential Energy Surface Of The Reaction Of Imidazole With Peroxynitrite: Density Functional Theory Study, Valentin Gogonea

Chemistry Faculty Publications

This article presents a theoretical investigation of the reaction mechanism of imidazole nitration by peroxynitrite using density functional theory calculations. Understanding this reaction mechanism will help in elucidating the mechanism of guanine nitration by peroxynitrite, which is one of the assumed chemical pathways for damaging DNA in cells. This work focuses on the analysis of the potential energy surface (PES) for this reaction in the gas phase. Calculations were carried out using Hartree–Fock (HF) and density functional theory (DFT) Hamiltonians with double-zeta basis sets ranging from 6-31G(d) to 6-31++G(d,p), and the triple-zeta basis set 6-311G(d). The computational results reveal that …

Best Practices In Land Bank Operation, Kevin O'Brien, Kirstin S. Toth, Claudette Robey, Christopher Gollan, Matthew Sattler, Jacob Duritsky, Sarah Hudecek

All Maxine Goodman Levin School of Urban Affairs Publications

In preparation for the development of a strategic business plan for the City of Cleveland to create an industrial/commercial land bank, the GLFEC conducted a best practices scan that encompassed two phases of primary research. The first phase included a thorough review of more than 41 sources of academic and trade literature on the topics of vacant land utilization and management, land banking, land assembly, and vacant and abandoned property policy. The second phase was a survey of 34 land banks and land redevelopment authorities in the United States. This report summarizes the findings of the research and identifies those …

Social Indicators In Cleveland's Ward 17, Mark Salling, Sharon Bliss, Joseph Ahern

All Maxine Goodman Levin School of Urban Affairs Publications

No abstract provided.

Title Page, Coordinating Editor's Remarks, Introductions To Each Part

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

Mathematics Teacher Specialists – Making A Difference For Student Learning, T. Rowan

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

Financial Support For Mathematics Specialists' Initiatives In Virginia, R. W. Farley, W. E. Haver, L D. Pitt

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

Thermal And Mechanical Properties Of Bawo4 Crystal, W. W. Ge, H. J. Wang, J. Y. Wang, J. H. Liu, X. G. Xu, X. B. Hu, M. H. Jiang, D. G. Ran, S. Q. Sun, H. R. Xia, Robert I. Boughton

Physics and Astronomy Faculty Publications

A large single crystal of barium tungstate BaWO4 with dimensions of 22- mm diameter 80-mm length was grown by the Czochralski method using an iridium crucible. The melting point, molar enthalpy of fusion, and molar entropy of fusion of the crystal were determined to be 1775.10 K, 96 913.80 J mol−1, and 54.60 J K−1 mol−1, respectively. The average linear thermal-expansion coefficients are a=10.9526 10−6/K, b=10.8069 10−6 /K, and c =35.1063 10−6 /K in the temperature range from 303.15 to 1423.15 K along the three respective crystallographic axes. The density of the crystal follows an almost linear decrease from 6.393 …

Leveraging Human Genomic Information To Identify Nonhuman Primate Sequences For Expression Array Development, Eliot R. Spindel, Mark Pauley, Yibing Jia, Courtney Gravett, Shaun L. Thompson, Nicholas F. Boyle, Sergio R. Ojeda, Robert B. Norgren Jr.

Interdisciplinary Informatics Faculty Publications

Background: Nonhuman primates (NHPs) are essential for biomedical research due to their similarities to humans. The utility of NHPs will be greatly increased by the application of genomicsbased approaches such as gene expression profiling. Sequence information from the 3' end of genes is the key resource needed to create oligonucleotide expression arrays.

Results: We have developed the algorithms and procedures necessary to quickly acquire sequence information from the 3' end of nonhuman primate orthologs of human genes. To accomplish this, we identified terminal exons of over 15,000 human genes by aligning mRNA sequences with genomic sequence. We found …

El Malpais Area: National Monument, National Conservation Area And The West Malpais And Cebolla Wilderness Areas, Kathryn M. Mutz, Doug Cannon, University Of Colorado Boulder. Natural Resources Law Center

Books, Reports, and Studies

53 p. : ill., maps

In Search Of Sustainable Water Management: International Lessons For The American West And Beyond, Douglas S. Kenney

Books, Reports, and Studies

This digital resource contains only an abstract, cover image and table of contents information from the published book.

Print copy of book is available in the University of Colorado’s Wise Law Library: http://lawpac.colorado.edu/record=b279300~S0

Contents: Water policy and cultural exchange : transferring lessons from around the world to the western United States / James L. Wescoat Jr. -- Roles for the public and private sectors in water allocation : lessons from around the world / Charles W. Howe, Helen Ingram -- Integrating environmental and other public values in water allocation and management decisions / David H. Getches, Sarah B. Van de …

A Multi-Server Markovian Queueing Model With Primary And Secondary Services, Valentina Klimenok, Srinivas R. Chakravarthy, Alexander Dudin

Industrial & Manufacturing Engineering Presentations And Conference Materials

We study a multi-server queueing model in which the arrivals occur according to a Markovian arrival process. An arriving customer either (a) is lost due to all main servers being busy; or (b) enters into service with one of the main servers and leaves the system (as a satisfied primary customer); (c) enters into a service with one of the main servers, gets service in self-service mode, and is impatient to get a final service with one of the main servers, may leave the system (as a dissatisfied secondary customer); or (d) enters into service with one of the main …

Multidimensional Kolmogorov-Petrovsky Test For The Boundary Regularity And Irregularity Of Solutions To The Heat Equation, Ugur G. Abdulla

Mathematics and System Engineering Faculty Publications

This paper establishes necessary and sufficient condition for the regularity of a characteristic top boundary point of an arbitrary open subset of ( ) for the diffusion (or heat) equation. The result implies asymptotic probability law for the standard -dimensional Brownian motion.

X-Ray Bursts Associated With Leader Steps In Cloud-To-Ground Lightning, Joseph R. Dwyer, Hamid K. Rassoul, M. Al-Dayeh, Lee Caraway, A. Chrest, Brian F. Wright, E. Kozak

Aerospace, Physics, and Space Science Faculty Publications

X-ray and electric field measurements were made during five nearby negative natural lightning strikes in north central Florida during the summer of 2004. The observed X-ray emission typically was detected ∼1 ms before the first return stroke, during the stepped-leader phase, and had energies extending up to a few hundred keV. The X rays were produced in discrete, intense bursts emitted in coincidence with the formation of the leader steps, demonstrating unambiguously that the source of lightning X rays is closely related to the stepping process. The X-ray emission from lightning stepped leaders is found to be remarkably similar to …

Semantic Notation And Retrieval In Art And Architecture Image Collections, Boyan N. Dimitrov

Mathematics Publications

In this paper we analyze various methods used for semantic annotation and search in a collection of art and architecture images. We discuss the Art and Architecture Thesaurus, WordNet, ULAN and Iconclass ontology. Systems for searching and retrieval art and architecture image collections are presented. We explore if the MPEG 7 descriptors are useful for art and architecture image annotations. For illustrations we use images from Antoni Gaudi architecture and Claude Monet paintings.

Test Of 3He Implanted Target, Caleb Dyer

The Corinthian

The proton-proton chains (p-p chains), a series of nuclear reactions were proposed several decades ago as a way in which hydrogen burning can occur in smaller main sequence stars. The ³He + ⁴He? ⁷Be reaction determines the path that the p-p chains follow. At present the cross section for this reaction has not been precisely determined. To measure this cross section a ³He target and ⁴He beam are to be used. ³He exists as a gas so a method to manufacture a solid ³He target was needed. A ³He beam was used …

"Middle Georgia Waters:" Chemical Analysis By Gc&Su Undergraduates, Melanie Mobley, Lance Cramer, Daniel Brooks, Catrena Higginbotham Ph.D

The Corinthian

Every living organism on Earth depends on water, many of which must consume liters of fresh water daily. Unfortunately, a readily available source of clean, fresh water is diminishing. Over the years, the fresh water supply has been polluted by biological and chemical sources. The nutrient levels and pesticide chemical contamination of several water locations in the Middle Georgia area were analyzed and monitored by chemistry majors at GC&SU over the past two years.

Bringing Up Robot: Fundamental Mechanisms For Creating A Self-Motivated, Self-Organizing Architecture, Doug Blank, Deepak Kumar, Lisa Meeden, James Marshall

Computer Science Faculty Research and Scholarship

In this paper we describe an intrinsic developmental algorithm designed to allow a mobile robot to incrementally progress through levels of increasingly-sophisticated behavior. We believe that the core ingredients for such a developmental algorithm are abstractions, anticipations, and self-motivations. We propose a multi-level, cascaded discovery and control architecture that includes the core ingredients. Toward this proposal we explore two novel models: a governor for automatically regulating the training of a neural network; and a path-planning neural network driven by patterns of “mental states” representing protogoals.

The Multiple Roles Of Anticipation In Developmental Robotics, Doug Blank, Joshua M. Lewis, James B. Marshall

Computer Science Faculty Research and Scholarship

Anticipatory systems have been shown to be useful in discrete, symbolic systems. However, non­symbolic anticipatory systems are less well understood. In this paper, we explore the use of anticipation within the framework of connectionist networks to bootstrap from an innate behavior; to drive a reinforcement signal; and to provide feedback on the learnability of a task.

Evidence For Alignment Of The Rotation And Velocity Vectors In Pulsars, Simon Johnston, G. Hobbs, S. Vigeland, M. Kramer, J. M. Weisberg, A. G. Lyne

Faculty Work

We review our case for strong observational evidence for a relationship between the direction of a pulsar’s motion and its rotation axis. The information comes from calibrated polarization data for 20 pulsars which display linearly polarized emission from the pulse longitude at closest approach to the magnetic pole. Of these 20 pulsars, 10 show an offset in the angle between the velocity vector and the polarisation position angle which is either less than 10◦ or more than 80◦ , a fraction which is very unlikely by random chance. We believe that the bimodal nature of the distribution arises from the …

Low-Temperature Glassy Response Of Ultrathin La0.8ca0.2mn03 Films To Electric And Magnetic Fields, A. Bhattacharya, Melissa Eblen-Zayas,, N. E. Staley, A. L. Kobrinskii, A. M. Goldman

Faculty Work

The glassy response of ultrathin films of La0.8Ca0.2MnO3 in the mixed phase to external magnetic and gated electro-static fields have been studied at low temperatures. The response of the resistance to external fields provides direct evidence for a hierarchical energy landscape, with strong cross-couplings between spin and charge. Magnetic coercivity measurements indicate that strong magnetic disorder accompanies the mixed phase in these films. This magnetic disorder, and the resultant coercivity, can be decreased by cooling in a large magnetic field or by electrostatic gating.

Coarse-Grained Entropy Decrease And Phase-Space Focusing In Hamiltonian Dynamics, Arjendu K. Pattanayak, Daniel W. C. Brooks, Anton De La Fuente, Lawrence Uricchio, Edward Holby, Daniel Krawisz, Jorge I. Silva

Faculty Work

We analyze the behavior of the coarse-grained entropy for classical probabilities in nonlinear Hamiltonians. We focus on the result that if the trajectory dynamics are integrable, the probability ensemble shows transient increases in the coherence, corresponding to an increase in localization of the ensemble and hence the phasespace density of the ensemble. We discuss the connection of these dynamics to the problem of cooling in atomic ensembles. We show how these dynamics can be understood in terms of the behavior of individual trajectories, allowing us to manipulate ensembles to create “cold” dense final ensembles. We illustrate these results with an …

Discovery Of Pulsed Oh Emission Stimulated By A Pulsar, Joel M. Weisberg, Simon Johnston, Barbel Koribalski, Snezana Stanimirovic

Faculty Work

Curium lies at the center of the actinide series and has a half-filled shell with seven 5f electrons spatially residing inside its radon core. As a function of pressure, curium exhibits five different crystallographic phases up to 100 gigapascals, of which all but one are also found in the preceding element, americium. We describe here a structure in curium, Cm III, with monoclinic symmetry, space group C2/c, found at intermediate pressures (between 37 and 56 gigapascals). Ab initio electronic structure calculations agree with the observed sequence of structures and establish that it is the spin polarization of curium’s 5f electrons …

Optimal Scheduling In A Queue With Differentiated Impatient Users, Amy Csizmar Dalal, Scott Jordan

Faculty Work

We consider a M/M/1 queue in which the average reward for servicing a job is an exponentially decaying function of the job’s sojourn time. The maximum reward and mean service times of a job are i.i.d. and chosen from arbitrary distributions. The scheduler is assumed to know the maximum reward, service rate, and age of each job. We prove that the scheduling policy that maximizes average reward serves the customer with the highest product of potential reward and service rate.

Geographic Routing In Social Networks, David Liben-Nowell, Jasmine Novak, Ravi Kumar, Prabhakar Raghavan, Andrew Tomkins

Faculty Work

We live in a ‘‘small world,’’ where two arbitrary people are likely connected by a short chain of intermediate friends. With scant information about a target individual, people can successively forward a message along such a chain. Experimental studies have verified this property in real social networks, and theoretical models have been advanced to explain it. However, existing theoretical models have not been shown to capture behavior in real-world social networks. Here, we introduce a richer model relating geography and social-network friendship, in which the probability of befriending a particular person is inversely proportional to the number of closer people. …

Global Stability Of Periodic Orbits Of Non-Autonomous Difference Equations And Population Biology, Saber Elaydi, Robert J. Sacker

Mathematics Faculty Research

Elaydi and Yakubu showed that a globally asymptotically stable(GAS) periodic orbit in an autonomous difference equation must in fact be a fixed point whenever the phase space is connected. In this paper we extend this result to periodic nonautonomous difference equations via the concept of skew-product dynamical systems. We show that for a k-periodic difference equation, if a periodic orbit of period r is GAS, then r must be a divisor of k. In particular sub-harmonic, or long periodic, oscillations cannot occur. Moreover, if r divides k we construct a non-autonomous dynamical system having minimum period k and …