Digital Commons Network^™

Sediment Detachment By Rain Power, Emmanuel Gabet, Thomas Dunne

Faculty Publications

In interrill areas, overland flow is often incapable of detaching soil particles so detachment is primarily by raindrop impact. We derive a mathematical expression, rain power (R, W m−2), relating the energy expenditure of raindrops impacting a soil surface to the rate of detachment of soil particles. Rain power incorporates rainfall, hillslope, and vegetation characteristics and is modulated by flow depths. Rainfall simulation experiments on natural hillslopes were performed to measure detachment rates and across-slope flow depth distributions in surface runoff. Our results indicate that flow depths follow a Poisson distribution, and this observation is used to develop a dimensionless …

Book Review For Achieving Success Through Social Capital, Clive Muir

Faculty Publications

Book Review of Achieving Success Through Social Capital by Wayne Baker. San Francisco" Jossey-Bass, Inc. 2000. 256pp.

An Analysis Of The Readability Of The Md&As Of Small, Medium, & Large Revenue Generating Cities, Shannon Lutz, Treba Marsh, Lucille Montondon

Faculty Publications

Studies assessing the annual reports of publicly held corporations have shown mixed results in regard to the readability levels of those reports. Recently, the Governmental Accounting Standards Board adopted GASB 33, 34, and 35 in which specific guidelines are outlined for the reporting of governmental entities. Are the Comprehensive Annual Financial Reports (annual reports) of the governmental entities understandable to the average user?

This study argues that the Managements Discussion and Analysis, the summary portion of the governmental annual report, is not understandable to the average reader. The sample was equally divided among small, medium, and large revenue-generating cities that …

Professional Competencies For Reference And User Services Librarians, Jo Bell Whitlatch

Faculty Publications

No abstract provided.

A Direct Simulation Monte Carlo Method For The Uehling-Uhlenbeck-Boltzmann Equation, Alejandro Garcia, W. Wagner

Faculty Publications

In this paper we describe a direct simulation Monte Carlo algorithm for the Uehling-Uhlenbeck-Boltzmann equation in terms of Markov processes. This provides a unifying framework for both the classical Boltzmann case as well as the Fermi-Dirac and Bose-Einstein cases. We establish the foundation of the algorithm by demonstrating its link to the kinetic equation. By numerical experiments we study its sensitivity to the number of simulation particles and to the discretization of the velocity space, when approximating the steady-state distribution.

Tracing The Star Stream Through M31 Using Planetary Nebula Kinematics, H. R. Merrett, K. Kuijken, M. R. Merrifield, Aaron J. Romanowsky, N. G. Douglas, N. R. Napolitano, M. Arnaboldi, M. Capaccioli, K. C. Freeman, O. Gerhard, N. W. Evans, M. I. Wilkinson, C. Halliday, T. J. Bridges, D. Carter

Faculty Publications

We present a possible orbit for the Southern Stream of stars in M31, which connects it to the Northern Spur. Support for this model comes from the dynamics of planetary nebulae (PNe) in the disc of M31: analysis of a new sample of 2611 PNe obtained using the Planetary Nebula Spectrograph reveals ∼20 objects with kinematics inconsistent with the normal components of the galaxy, but which lie at the right positions and velocities to connect the two photometric features via this orbit. The satellite galaxy M32 is coincident with the stream both in position and velocity, adding weight to the …

A Dearth Of Dark Matter In Ordinary Elliptical Galaxies, Aaron J. Romanowsky, N. G. Douglas, M. Arnaboldi, K. Kuijken, M. R. Merrifield, N. R. Napolitano, M. Capaccioli

Faculty Publications

The kinematics of the outer parts of three intermediate-luminosity elliptical galaxies were studied with the Planetary Nebula Spectrograph. The galaxies' velocity-dispersion profiles were found to decline with the radius, and dynamical modeling of the data indicates the presence of little if any dark matter in these galaxies' halos. This unexpected result conflicts with findings in other galaxy types and poses a challenge to current galaxy formation theories.

Tetratricopeptide Repeat Motif-Mediated Hsc70-Msti1 Interaction Molecular Characterization Of The Critical Contacts For Successful Binding And Specificity*, Odutayo O. Odunuge, Judith A. Hornby, Chrisiane Bies, Richard Zimmermann, David J. Pugh, Gregory L. Blatch

Faculty Publications

Murine stress-inducible protein 1 (mSTI1) is a cochaperone that is homologous with the human Hsp70/ Hsp90-organizing protein (Hop). Guided by Hop structural data and sequence alignment analyses, we have used site-directed mutagenesis, co-precipitation assays, circular dichroism spectroscopy, steady-state fluorescence, and surface plasmon resonance spectroscopy to both qualitatively and quantitatively characterize the contacts necessary for the N-terminal tetratricopeptide repeat domain (TPR1) of mSTI1 to bind to heat shock cognate protein 70 (Hsc70) and to discriminate between Hsc70 and Hsp90. We have shown that substitutions in the first TPR motif of Lys8 or Asn12 did not affect binding of mSTI1 to Hsc70, …

Dendritic Surfactants Show Evidence For Frustrated Intercalation: A New Organoclay Morphology, Erick J. Acosta, Youjun Deng, G. Norman White, Joe B. Dixon, Kevin J. Mcinnes, Scott A. Senseman, Alyx S. Frantzen, Eric E. Simanek

Faculty Publications

Mixing a smectite clay with some dendritic surfactants shows that despite the large size of some of these molecules, a property that frustrates complete intercalation into the gallery of the clay, organoclay materials are obtained. X-ray powder diffraction (XPD) reveals no significant increases in lattice spacing as these surfactants are added. Infrared (IR) spectroscopy and thermal gravimetric analysis (TGA) show that interlayer water is preserved. Consistent with an undisturbed interlayer, the amount of organic material in organoclays derived from frustrated surfactants does not exceed 15% of the cationic exchange capacity (CEC) of the composite. Smaller dendritic surfactants do not display …

The Semiotics Of Signlessness: A Buddhist Doctrine Of Signs, Mario D'Amato

Faculty Publications

In this paper, I consider a Buddhist response to the issue of unlimited semiosis: In other words, I offer a Buddhist account of how unlimited semiosis should be understood. I do this by following the doctrine of signs offered in an Indian Buddhist text of the Mahamyamna from circa the fourth century CE, a text known as the Mahamyamnasutra m mlamD kamra (Ornament to the Scriptures of the Great Vehicle; hereafter, ‘the Ornament’). Perhaps the most interesting aspect of Buddhist semiotics, from both a historical and a philosophical point of view, is that in its theorizing of the semiotic process, …

Inverted Velocity Profile In The Cylindrical Couette Flow Of A Rarefied Gas, Alejandro Garcia, K. Aoki, H. Yoshida, T. Nakanishi

Faculty Publications

The cylindrical Couette flow of a rarefied gas is investigated, under the diffuse-specular reflection condition of Maxwell’s type on the cylinders, in the case where the inner cylinder is rotating whereas the outer cylinder is at rest. The inverted velocity profile for small accommodation coefficients, pointed out by Tibbs, Baras, and Garcia [Phys. Rev. E 56, 2282 (1997)] on the basis of a Monte Carlo simulation, is investigated extensively by means of a systematic asymptotic analysis for small Knudsen numbers as well as the direct numerical analysis of the Boltzmann equation, and the parameter range in which the phenomenon appears …

Do Red-Cockaded Woodpeckers Select Cavity Trees Based On Chemical Composition Of Pine Resin?, Richard N. Conner

Faculty Publications

We examined resin chemistry of loblolly (Pinus taeda) and shortleaf (P. echinata) pines selected as cavity trees by Red-cockaded Woodpeckers (Picoides borealis) in eastern Texas. We sampled resin from (1) pines selected by Red-cockaded Woodpeckers that contained naturally excavated active cavities, (2) pines selected by forest biologists that contained artificially installed cavity inserts and were actively being used by Red-cockaded Woodpeckers, and (3) control pines of similar age and appearance to the active cavity trees. We hypothesized that if woodpeckers are inducing a change in resin chemistry by excavating resin wells, this change should …

Pointing The Finger Of Blame: News Media Coverage Of Popular-­Culture Culpability, Erica Scharrer, Lisa M. Weidman, Kimberly Bissell

Faculty Publications

In the 1990s, three relatively high-profile tragedies occurred in which popular media products (including movies, recorded music, television talk shows, the Internet, tabloid newspapers, and video games) were argued to be the primary cause. This study analyzes the discourse surrounding the culpability that was placed on popular culture in major newspaper coverage of the car crash that killed Princess Diana, the murder associated with the “Jenny Jones” show, and the shootings at Columbine High School in Littleton, Colorado. The analysis reveals patterns in the assignment of blame—and relatively more rarely of exoneration—of popular culture, interpreting why and how popular culture …

Factor Structure Of The Coaching Behavior Questionnaire And Its Relationship To Athlete Variables, Jean M. Williams, Gerald J. Jerome, Laura J. Kenow, Tracie Rogers, Tessa A. Sartain, Greg Darland

Faculty Publications

Little research exists to identify optimal coaching behaviors and factors that influence the effectiveness of particular behaviors. The present study tested 484 athletes in order to determine sub-scales on the Coaching Behavior Questionnaire (CBQ). The CBQ measures athletes’ perceptions of coaching behaviors and evaluates their effectiveness in helping athletes play better and maintain optimal mental states and focus. A confirmatory factor analysis (CFA) supported the two-factor model (negative activation, supportiveness/emotional composure) derived from an exploratory factor analysis (EFA). Correlational analyses indicated that athletes with higher anxiety and lower self-confidence and compatibility with the coach were more likely to negatively evaluate …

The Authority Of A Court To Order Disgorgement For Violations Of The Current Good Manufacturing Practices Requirement Of The Federal Food, Drug, And Cosmetic Act, Erika Lietzan, Elizabeth M. Walsh

Faculty Publications

This article addresses the question as to whether a federal court has the authority to compel a pharmaceutical company to disgorge profits obtained from an alleged violation of the FDCA, specifically the failure of a pharmaceutical company to comply with current good manufacturing practices (GMPs). Section II of this article summarizes the article to which we are responding. In all fairness, it did not purport to be a full-blown defense, and we expect the agency's comprehensive defense of disgorgement would be considerably more detailed. Section III turns to the Sixth Circuit case on which FDA rests its argument for disgorgement, …

Matrix Composition Affects The Spatial Ecology Of A Prairie Planthopper, Kyle J. Haynes, James T. Cronin

Faculty Publications

To date, there is a lack of well-controlled field experiments that disentangle the effects of the intervening matrix from other landscape variables (e.g., patch geography or quality) that might influence animal dispersal among patches. We performed a field experiment to investigate how the movement of a delphacid planthopper (Prokelisia crocea) among discrete patches of prairie cordgrass (Spartina pectinata) is affected by the composition of the matrix (mudflat, native nonhost grasses, and the introduced grass smooth brome [Bromus inermis]). Within each matrix type, marked planthoppers were released onto experimental cordgrass patches that were made identical in size, isolation, and host plant …

Movement And Spatial Population Structure Of A Prairie Planthopper, James T. Cronin

Faculty Publications

The transfer of organisms among patches is a key process influencing the spatial structure and regional dynamics of a population; yet, detailed experimental studies of animal movement among patches are uncommon. I performed a series of mark-recapture studies to quantify the movement of a planthopper, Prokelisia crocea (Hemiptera: Delphacidae), among discrete patches of its host plant, prairie cordgrass (Spartina pectinata). Results from these dispersal studies were used to predict the natural distributions and to characterize the spatial population structure of P. crocea. Planthopper emigration loss per patch increased linearly with the density of female conspecifics and was nonlinearly related to …

A Representation Theorem For Recovering Contraction Relations Satisfying Wci, Zhaohui Zhu, Bin Li, Xi'an Xiao, Shifu Chen, Wujia Zhu

Faculty Publications

A notion of an image structure associated with the canonical epistemic state is introduced. Based on it, we get a representation result for recovering contraction inference relations satisfying the condition weak conjunctive inclusion (wci) in terms of F-standard epistemic AGM states. In effect, this result establishes a representation theorem for belief contraction functions satisfying AGM postulates (k-1) - (k-7), and Rott's (wci) and (k-8c), and hence generalizes Rott's corresponding result in the finite framework. © 2002 Elsevier Science B.V. All rights reserved.

Packing Cycles In Graphs, Ii, Guoli Ding, Zhenzhen Xu, Wenan Zang

Faculty Publications

A graph G packs if for every induced subgraph H of G, the maximum number of vertex-disjoint cycles in H is equal to the minimum number of vertices whose deletion from H results in a forest. The purpose of this paper is to characterize all graphs that pack. © 2002 Elsevier Science (USA). All rights reserved.

Multiplicative Renormalization And Generating Functions I, Nobuhiro Asai, Izumi Kubo, Hui Hsiung Kuo

Faculty Publications

Let μ be a probability measure on the real line with finite moments of all orders. Apply the Gram-Schmidt orthogonalization process to the system {1, x, x2, . . ., xn, . . .} to get orthogonal polynomials Pn(x), n ≥ 0, which have leading coefficient 1 and satisfy (x-αn)Pn(x) = Pn+1(x) +ωnPn-1(x). In general it is almost impossible to use this process to compute the explicit form of these polynomials. In this paper we use the multiplicative renormalization to develop a new method for deriving generating functions for a large class of probability measures. From a generating function for …

Optimization Of Resonances In Photonic Crystal Slabs, Robert P. Lipton, Stephen P. Shipman, Stephanos Venakides

Faculty Publications

Variational methods are applied to the design of a two-dimensional lossless photonic crystal slab to optimize resonant scattering phenomena. The method is based on varying properties of the transmission coefficient that are connected to resonant behavior. Numerical studies are based on boundary-integral methods for crystals consisting of multiple scatterers. We present an example in which we modify a photonic crystal consisting of an array of dielectric rods in air so that a weak transmission anomaly is transformed into a sharp resonance.

Design-Dependent Loads In Topology Optimization, Blaise Bourdin, Antonin Chambolle

Faculty Publications

We present, analyze, and implement a new method for the design of the stiffest structure subject to a pressure load or a given field of internal forces. Our structure is represented as a subset S of a reference domain, and the complement of S is made of two other “phases”, the “void” and a fictitious “liquid” that exerts a pressure force on its interface with the solid structure. The problem we consider is to minimize the compliance of the structure S, which is the total work of the pressure and internal forces at the equilibrium displacement. In order to prevent …

Decoherence In A Driven Three-Level System, A. R.P. Rau, Weichang Zhao

Faculty Publications

Dissipation and decoherence, and the evolution from pure to mixed states in quantum physics, are handled through master equations for the density matrix. Master equations such as the Lindblad equation preserve the trace of this matrix. Viewing them as first-order time-dependent operator equations for the elements of the density matrix, a unitary integration procedure can be adapted to solve for these elements. A simple model for decoherence preserves the Hermiticity of the density matrix. A single, classical Riccati equation is the only one requiring numerical handling to obtain a full solution of the quantum evolution. The procedure is general, valid …

Detectability Of Gravitational Waves From Sn 1987a, Giovanni Santostasi, Warren Johnson, Juhan Frank

Faculty Publications

We discuss the potential for the detection of gravitational waves from a rapidly spinning neutron star produced by supernova (SN) 1987A, taking the parameters claimed by Middleditch et al. at face value. Assuming that the dominant mechanism for spin-down is gravitational waves emitted by a freely precessing neutron star, it is possible to constrain the wobble angle, the effective moment of inertia of the precessing crust, and the crust cracking stress limit. Our analysis suggests that if the interpretation of the Middleditch data is correct, the compact remnant of SN 1987A may well provide a predictable source of gravitational waves …

Developing A User-Process Model For Designing Menu-Based Interfaces: An Exploratory Study, Boryung Ju, Myke Gluck

Faculty Publications

The purpose of this study was to organize menu items based on a user-process model and implement a new version of current software for enhancing usability of interfaces. Dervin & Nilan's time-line method is used to develop a user-process model for user interface design. We developed a user process model drawn from actual users' understanding of their goals and strategies to solve their information needs by using Dervin's Sense-Making Theory with sense-making interviews. Six experienced subjects were recruited for the sense-making interviews. Each subject went through a learning/exploration session, and was asked to recall and describe specific information needs throughout …

Downstream Hydraulic Geometry Relations: 2. Calibration And Testing, Vijay P. Singh, Chih Ted Yang, Zhi Qiang Deng

Faculty Publications

Using 456 data sets under bank-full conditions obtained from various sources, the geometric relations, derived in part 1 [Singh et al., 2003], are calibrated and verified using the split sampling approach. The calibration of parameters shows that the change in stream power is not shared equally among hydraulic variables and that the unevenness depends on the boundary conditions to be satisfied by the channel under consideration. The agreement between the observed values of the hydraulic variables and those predicted by the derived relations is close for the verification data set and lends credence to the hypotheses employed in this study.

Nonresonance Conditions For Arrangements, D. C. Cohen, A. Dimca, P. Orlik

Faculty Publications

We prove a vanishing theorem for the cohomology of the complement of a complex hyperplane arrangement with coefficients in a complex local system. This result is compared with other vanishing theorems, and used to study Milnor fibers of line arrangements, and hypersurface arrangements.

Methods And Models For Estimating Advective Pore Water Exchange In Tidal Flats, Timothy J. Shaw

Faculty Publications

No abstract provided.

Reflections On The Myth Of Icarus In The Age Of Information, Allen S. Hammond Iv

Faculty Publications

It is economics, policy, law, and indeed, for some, religion that advanced information technology should be eventually accessible to the masses. To this end, the federal and state governments are establishing goals and guidelines for advanced information technology's equitable deployment. Chief among the governments' intended beneficiaries are our children, Generations X,Y, Z, and beyond. The explicit expectation, however, is that every individual and group in our society would benefit from such deployment.

Efficiencies in the computer augmented generation, embedded in the processing and storing of information are expected to enhance education, commerce, the economy, political discourse, individual self actualization, and …

1984 And Beyond: Two Decades Of Copyright Law, Tyler T. Ochoa

Faculty Publications

During the past two decades, engineers, authors, publishers, consumers, lawyers and academics have witnessed extraordinary developments in the technological landscape, often leading to equally dramatic developments in the law of copyright. Many of these developments have been chronicled (or foreshadowed) in the pages of the Santa Clara Computer and High Technology Law Journal. To celebrate the Journal's 20th Anniversary, this essay will place a number of articles which have appeared in the Journal in their historical context by taking a look back on how the law of copyright has changed during the past twenty years.