Digital Commons Network^™

Active Alu Element "A-Tails": Size Does Matter, Astrid M. Roy-Engel, Abdel Halim Salem, Oluwatosin O. Oyeniran, Lisa Deininger, Dale J. Hedges, Gail E. Kilroy, Mark A. Batzer, Prescott L. Deininger

Faculty Publications

Long and short interspersed elements (LINEs and SINEs) are retroelements that make up almost half of the human genome. L1 and Alu represent the most prolific human LINE and SINE families, respectively. Only a few Alu elements are able to retropose, and the factors determining their retroposition capacity are poorly understood. The data presented in this paper indicate that the length of Alu "A-tails" is one of the principal factors in determining the retropositional capability of an Alu element. The A stretches of the Alu subfamilies analyzed, both old (Alu S and J) and young (Ya5), had a Poisson distribution …

Modeling The Thermal Behavior Of A Surface-Micromachined Linear-Displacement Thermomechanical Microactuator, Christian D. Lott, Timothy W. Mclain, John N. Harb, Larry L. Howell

Faculty Publications

Thermomechanical microactuators possess a number of desirable attributes including ease of fabrication and large force and displacement capabilities relative to other types of microactuators. These advantages provide motivation for improving thermomechanical microactuator designs that are more energy efficient and thus better suited for low-power applications. To this end, this paper describes the development and experimental validation of a finite-difference thermal model of a thermomechanical in-plane microactuator (TIM). Comparisons between the model and experimental results demonstrate the importance of including the temperature dependence of several parameters in the model. Strategies for reducing the power and energy requirements of the TIM were …

Seeking Salvation For Accountability, Melvin J. Dubnick

Faculty Publications

This is a paper in defense of a concept that is threatened by its popularity and undermined by those who use it most. It is a call for a reexamination and reaffirmation of “accountability” from the perspective of its central role in modern governance. It is a plea for saving the concept of accountability from the abuses it suffers in the hands of friends and advocates. It is an effort at salvation for a concept that has lost its meaningful “soul” in a world filled with rhetoricians, reformers, and functionalists – all well intentioned, but each contributing to accountability’s fall …

Leading Neutron Production In E+ P Collisions At Hera, S. Chekanov, D. Krakauer, S. Magill, B. Musgrave, A. Pellegrino, J. Repond, R. Yoshida, Margarita C. K. Mattingly, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, G. Cara Romeo, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, S. De Pasquale, P. Giusti, G. Iacobucci, G. Levi, A. Margotti, R. Nania, F. Palmonari, A. Pesci, G. Sartorelli, A. Zichichi, G. Aghuzumtsyan

Faculty Publications

The production of neutrons carrying at least 20% of the proton beam energy (xL > 0.2) in e+ p collisions has been studied with the ZEUS detector at HERA for a wide range of Q2, the photon virtuality, from photoproduction to deep inelastic scattering. The neutron-tagged cross section, ep → e′ Xn, is measured relative to the inclusive cross section, ep → e′ X, thereby reducing the systematic uncertainties. For xL > 0.3, the rate of neutrons in photoproduction is about half of that measured in hadroproduction, which constitutes a clear breaking of factorisation. There is about a 20% rise in the …

A Metadata Approach To Preservation Of Digital Resources: The University Of North Texas Libraries' Experience, Daniel Gelaw Alemneh, Samantha K. Hastings, Cathy Hartman

Faculty Publications

Preserving long-term access to digital information resources is one of the key challenges facing libraries and information centers today. The University of North Texas (UNT) Libraries has entered into partnership agreements with federal and state agencies to ensure permanent storage and public access to a variety of government information sources. As digital resource preservation encompasses a wide variety of interrelated activities, the UNT Libraries are taking a phased approach to ensure the long-term access to its digital resources. Formulation of preservation policy and creation of preservation metadata for electronic files and digital collections are among the most important steps. This …

Echoes In X-Ray Binaries, K. O'Brien, Keith Horne, R. I. Hynes, W. Chen, C. A. Haswell, M. D. Still

Faculty Publications

We present a method of analysing the correlated X-ray and optical/UV variability in X-ray binaries, using the observed time delays between the X-ray driving light curves and their reprocessed optical echoes. This allows us to determine the distribution of reprocessing sites within the binary. We model the time-delay transfer functions by simulating the distribution of reprocessing regions, using geometrical and binary parameters. We construct best-fitting time-delay transfer functions, showing the regions in the binary responsible for the reprocessing of X-rays. We have applied this model to observations of the soft X-ray transient GRO J1655-40. We find that the optical variability …

Viewpoint: Experimental Recovery Of Geometrically Necessary Dislocation Density In Polycrystals, Brent L. Adams, Bassem S. El-Dasher, Anthony D. Rollett

Faculty Publications

The authors wish to thank The Alcoa Technical Research Center for supplying the specimens and performing the compression tests. This work was supported primarily by the MRSEC program of the National Science Foundation under DMR-0079996. Application of electron backscattering diffraction methods to recover estimates of the geometrically necessary dislocation density is described. The limitations of the method arising from the opacity of crystalline materials and the spatial and angular resolution limits are discussed.

Simulations Of The Instability Of The M = 1 Self-Shielding Diocotron Mode In Finite-Length Non-Neutral Plasmas, Grant W. Mason, Ross L. Spencer

Faculty Publications

The "self-shielding" m = 1 diocotron mode in Malmberg-Penning traps has been known for over a decade to be unstable for finite length non-neutral plasmas with hollow density profiles. Early theoretical efforts were unsuccessful in accounting for the exponential growth and/or the magnitude of the growth rate. Recent theoretical work has sought to resolve the discrepancy either as a consequence of the shape of the plasma ends or as a kinetic effect resulting from a modified distribution function as a consequence of the protocol used to form the hollow profiles in experiments. Both of these finite length mechanisms have been …

Measurement Of High-Q 2 Charged Current Cross Sections In E - P Deep Inelastic Scattering At Hera, S. Chekanov, D. Krakauer, S. Magill, B. Musgrave, J. Repond, R. Yoshida, Margarita C. K. Mattingly, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, G. Cara Romeo, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, S. De Pasquale, P. Giusti, G. Iacobucci, G. Levi, A. Margotti, R. Nania, F. Palmonari, A. Pesci, G. Sartorelli, A. Zichichi, G. Aghuzumtsyan, D. Bartsch

Faculty Publications

Cross sections for e - p charged current deep inelastic scattering have been measured at a centre-of-mass energy of 318 GeV with an integrated luminosity of 16.4 pb -1 using the ZEUS detector at HERA. Differential cross sections dσ/dQ 2, dσ/dx and dσ/dy are presented for Q 2 > 200 GeV 2. In addition, d 2σ/(dxdQ 2) was measured in the kinematic range 280 GeV 2 < Q 2 < 30 000 GeV 2 and 0.015 < × < 0.42. The predictions of the Standard Model agree well with the measured cross sections. The mass of the W boson, determined from a fit to dσ/dQ 2, is M W = 80.3±2.1(stat.) ± 1.2(syst.) ± 1.0(PDF) GeV. © 2002 Published by Elsevier Science B.V.

Detection Of Superhumps In Xte J1118+480 Approaching Quiescence, C. Zurita, J. Casares, T. Shahbaz, R. M. Wagner, C. B. Foltz, P. Rodríguez-Gil, R. I. Hynes, P. A. Charles, E. Ryan, G. Schwarz, S. G. Starrfield

Faculty Publications

We present the results of our monitoring of the halo black hole soft X-ray transient (SXT) XTE J1118+480 during its decline to quiescence. The system has decayed 0.5 mag from 2000 December to its present near-quiescent level at R ≃ 18.65 (2001 June). The ellipsoidal light curve is distorted by an additional modulation that we interpret as a superhump of Psh = 0.17049(1) d i.e. 0.3 per cent longer than the orbital period. This implies a disc precession period Pprec ∼ 52 d. After correcting the average phase-folded light curve for veiling, the amplitude difference between the minima suggests that …

Lessons Learned From The "It Takes A Valley" Program: Recruitng And Retaining Future Teachers To Serve High-Needs Schools, Amy Strage, Susan Meyers, Janet Norris

Faculty Publications

“It Takes a Valley” is a teacher preparation program that aims to recruit and retain teachers in schools that serve students from low socioeconomic backgrounds. This program provides future teachers with extensive early teaching experience and chances to develop strategies for success in this type of educational context. The theoretical basis for this program's approach is examined, some key aspects of the program are considered, the initial evaluation of the program and the lessons learned to date are explored, the challenges and growing pains encountered by the program are examined, and the implications of the program for teacher education are …

After Ellerth: The Tangible Employment Action In Sexual Harassment Analysis, Susan Grover

Faculty Publications

In this Article, Professor Grover argues that courts too readily allow employers to avoid vicarious liability far supervisors' unlawful sexual harassment of subordinates. The Article explores the breadth of the affirmative defense first introduced in the Supreme Court's 1998 cases of Faragher v. Boca Raton and Burlington Indus., Inc. v. Ellerth. That defense clears an employer of liability for a supervisor's unlawful sexual harassment if (a) the employer exercised reasonable care to prevent and correct promptly any sexually harassing behavior, and (b) the plaintiff employee unreasonably failed to take advantage of any preventive or corrective opportunities provided by the employer …

Towards A National Putative Father Registry Database, Mary M. Beck

Faculty Publications

This Article analyzes putative father registries and proposes federal legislation to create a national database that will enhance and connect the state and local registries. Issues and events leading to the development of registries are reviewed in Part I. Putative father registry mechanics and applicable case law are analyzed in Parts II and III.

Measurements Of Charged Current Reactions Of Νμ On 12C, L. B. Auerbach, R. L. Burman, D. O. Caldwell, E. D. Church, J. B. Donahue, A. Fazely, G. T. Garvey, R. M. Gunasingha, R. Imlay, W. C. Louis, R. Majkic, A. Malik, W. Metcalf, G. B. Mills, V. Sandberg, D. Smith, I. Stancu, M. Sung, R. Tayloe, G. J. Vandalen, W. Vernon, N. Wadia, D. H. White, S. Yellin

Faculty Publications

Charged current scattering of νμ, on 12C has been studied using a π+ decay-in-flight νμ beam at the Los Alamos Neutron Science Center. A sample of 66.9±9.1 events satisfying criteria for the exclusive reaction 12 C(νμ,μ-)12Ng.s. was obtained using a large liquid scintillator neutrino detector. The observed flux-averaged cross section (5.6±0.8±1.0) × 10-41 cm2 agrees well with reliable theoretical expectations. A measurement was also obtained for the inclusive cross section to all accessible 12N states 12C(νμ,μ-)X. This flux-averaged cross section is (10.6±0.3±1.8) × 10-40 cm2 which is lower than present theoretical calculations.

Relaxation Through Homogenization For Optimal Design Problems With Gradient Constraints, R. Lipton

Faculty Publications

The problem of the relaxation of optimal design problems for multiphase composite structures in the presence of constraints on the gradient of the state variable is addressed. A relaxed formulation for the problem is given in the presence of either a finite or infinite number of constraints. The relaxed formulation is used to identify minimizing sequences of configurations of phases.

Vibrational Modes Of Thin Oblate Clouds Of Charge, Thomas G. Jenkins, Ross L. Spencer

Faculty Publications

A numerical method is presented for finding the eigenfunctions (normal modes) and mode frequencies of azimuthally symmetric non-neutral plasmas confined in a Penning trap whose axial thickness is much smaller than their radial size. The plasma may be approximated as a charged disk in this limit; the normal modes and frequencies can be found if the surface charge density profile sigma(r) of the disk and the trap bounce frequency profile wz(r) are known. The dependence of the eigenfunctions and equilibrium plasma shapes on nonideal components of the confining Penning trap fields is discussed. The results of the calculation are compared …

Exclusive Photoproduction Of J/Ψ Mesons At Hera, S. Chekanov, D. Krakauer, S. Magill, B. Musgrave, A. Pellegrino, J. Repond, R. Yoshida, Margarita C. K. Mattingly, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, G. Cara Romeo, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, S. De Pasquale, P. Giusti, G. Iacobucci, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari, A. Pesci, G. Sartorelli, A. Zichichi

Faculty Publications

The exclusive photoproduction of J/ψ mesons, γp → J/ψp, has been studied in ep collisions with the ZEUS detector at HERA, in the kinematic range 20 < W < 290 GeV, where W is the photon-proton centre-of-mass energy. The J/ψ mesons were reconstructed in the ninon and the electron decay channels using integrated luminosities of 38 pb-1 and 55 pb-1, respectively. The helicity structure of J/ψ production shows that the hypothesis of s-channel helicity conservation is satisfied within two standard deviations. The total cross section and the differential cross-section dσ/dt, where t is the squared four-momentum transfer at the proton vertex, are presented as a function of W, for |t| < 18 Ge2. The t distribution exhibits an exponential shape with a slope parameter increasing logarithmically with W with a value b = 4.15 ± 0.05(stat.)-0.18+0.30(syst.) GeV-2 at W = 90 GeV. The effective parameters of the Pomeron trajectory are αℙ(0) = 1.200 ± 0.009(stat.) -0.010+0.004(Syst.) and α′ℙ = 0.115 ± 0.018(stat.)-0.015+0.008(syst.) GeV-2.

Justice Unconceived: How Posterity Has Rights, Aaron-Andrew P. Bruhl

Faculty Publications

No abstract provided.

Comparison Of Algorithms For Estimating Ocean Primary Production From Surface Chlorophyll, Temperature, And Irradiance, Janet Campbell, David Antoine, Robert Armstrong, Kevin Arrigo, William Balch, Richard Barber, Michael Behrenfield, Robert Bidigare, James Bishop, Mary-Elena Carr, Wayne Esaias, Paul Falkowski, Nicolas Hoepffner, Richard Iverson, Dale Kiefer, Steven E. Lohrenz, John Marra, Andre Morel, John Ryan, Vladimir Vedernekov, Kirk Waters, Charles Yentsch, James Yoder

Faculty Publications

[1] Results of a single-blind round-robin comparison of satellite primary productivity algorithms are presented. The goal of the round-robin exercise was to determine the accuracy of the algorithms in predicting depth-integrated primary production from information amenable to remote sensing. Twelve algorithms, developed by 10 teams, were evaluated by comparing their ability to estimate depth-integrated daily production (IP, mg C m(-2)) at 89 stations in geographically diverse provinces. Algorithms were furnished information about the surface chlorophyll concentration, temperature, photosynthetic available radiation, latitude, longitude, and day of the year. Algorithm results were then compared with IP estimates derived from (14)C uptake measurements …

Marbury Ascendant: The Rehnquist Court And The Power To "Say What The Law Is", Timothy Zick

Faculty Publications

No abstract provided.

Machine-Learned Contexts For Linguistic Operations In German Sentence Realization, Eric K. Ringger, Simon Corston-Oliver, Michael Gamon, Robert Moore

Faculty Publications

We show that it is possible to learn the contexts for linguistic operations which map a semantic representation to a surface syntactic tree in sentence realization with high accuracy. We cast the problem of learning the contexts for the linguistic operations as classification tasks, and apply straightforward machine learning techniques, such as decision tree learning. The training data consist of linguistic features extracted from syntactic and semantic representations produced by a linguistic analysis system. The target features are extracted from links to surface syntax trees. Our evidence consists of four examples from the German sentence realization system code-named Amalgam: case …

Crisis And Constitutionalism, Michael J. Gerhardt

Faculty Publications

No abstract provided.

Swift Neighbors And Persistent Strangers: A Cross-Cultural Investigation Of Trust And Reciprocity In Social Exchange, Nancy R. Buchan, Rachel T.A. Croson, Robin M. Dawes

Faculty Publications

In four countries, levels of trust and reciprocity in direct-reciprocal exchange are compared with those in network-generalized exchanges among experimentally manipulated groups’ members (neighbors) or random experimental participants (strangers). Results show that cooperation decreases as social distance increases; and, that identical network-generalized exchanges generate different amounts of trusting behavior due solely to manipulated social identity between the actors.

This study demonstrates the interaction of culture and social identity on the propensity to trust and reciprocate and also reveals differing relationships between trust and reciprocation in each of the four countries, bringing into question the theoretical relationship between these cooperative behaviors.

Book Review. Nonprofits In Urban America (Richard C. Hula, Cynthia Jackson-Elmoore, Eds.), Peter J. Haas

Faculty Publications

No abstract provided.

A Course Assessment Of The Microelectronics Process Engineering Program At Sjsu, Gregory Young, Stacy H. Gleixner, David W. Parent, Yasser Dessouky, Emily Allen, Linda Vanasupa

Faculty Publications

The program assessment strategy of San Jose State University's new interdisciplinary curriculum in Microelectronics Process Engineering is described. Vertical integration of specific class and program learning objectives allows for a clear and efficient method to evaluate the continued growth and improvement of the program. The program assessment process relies on clearly defined and detailed program and course learning objectives that are linked vertically to ABET outcomes. In addition, we discuss briefly the structure of the program and the "hands-on" experience that we provide the students.

What Are The Hot R Coronae Borealis Stars?, Orsola De Marco, Geoffrey C. Clayton, F. Herwig, D. L. Pollacco, J. S. Clark, David Kilkenny

Faculty Publications

We investigate the evolutionary status of four stars: V348 Sgr, DY Cen, and MV Sgr in the Galaxy and HV 2671 in the LMC. These stars have in common random deep declines in visual brightness, which are characteristic of R Coronae Borealis (RCB) stars. RCB stars are typically cool hydrogen-deficient supergiants. The four stars studied in this paper are hotter (Teff = 15-20 kK) than the majority of RCB stars (Teff = 5000-7000 K). Although these are commonly grouped together as the hot RCB stars they do not necessarily share a common evolutionary history. We present new observational data and …

Nonresonant Detection Of Terahertz Radiation In Field Effect Transistors, W. Knap, V. Kachorovskii, Y. Deng, S. Rumyantsev, J.-Q. Lü, R. Gaska, M. S. Shur, Grigory Simin, X. Hu, M. Asif Khan, C. A. Saylor, L. C. Brunel

Faculty Publications

We present an experimental and theoretical study of nonresonant detection of subterahertz radiation in GaAs/AlGaAs and GaN/AlGaN heterostructurefield effect transistors. The experiments were performed in a wide range of temperatures (8–300 K) and for frequencies ranging from 100 to 600 GHz. The photoresponse measured as a function of the gate voltage exhibited a maximum near the threshold voltage. The results were interpreted using a theoretical model that shows that the maximum in photoresponse can be explained by the combined effect of exponential decrease of the electron density and the gate leakage current.

N Uptake As A Function Of Concentration In Streams, Walter K. Dodds, Amanda J. Lopez, William B. Bowden, Stan Gregory, Nancy B. Grimm, Stephen K. Hamilton, Anne E. Hershey, Eugenia Marti, William H. Mcdowell, Judy L. Meyer, Donna Morrall, Patrick J. Mulholland, Bruce J. Peterson, Jennifer L. Tank, H. Maurice Valett, Jackson R. Webster, Wilfred M. Wollheim

Faculty Publications

Detailed studies of stream N uptake were conducted in a prairie reach and gallery forest reach of Kings Creek on the Konza Prairie Biological Station. Nutrient uptake rates were measured with multiple short-term enrichments of NO3− and NH4+ at constant addition rates in the spring and summer of 1998. NH4+ uptake was also measured with 15N-NH4+ tracer additions and short-term unlabeled NH4+ additions at 12 stream sites across North America. Concurrent addition of a conservative tracer was used to account for dilution in all experiments. NH4+ uptake rate per unit area (Ut) was positively correlated to nutrient concentration across all …

Dynamic Multiphysics Model For Solar Array, Shengyi Liu, Roger A. Dougal

Faculty Publications

An approach to model the solar cell system with coupled multiphysics equations (photovoltaic, electro-thermal, direct heating and cooling processes) within the context of the resistive-companion method in the Virtual Test Bed computational environment is presented. Appropriate across and through variables are defined for the thermal terminal of the system so that temperature is properly represented as a state variable, rather than as a parameter of the system. This allows enforcement of the system power conservation through all terminals, and allows simultaneous solutions for both the electrical potentials and the system temperature. The thermal port built accordingly can be used for …

Validation Of Sea Ice Motion From Quikscat With Those From Ssm/I And Buoy, David G. Long, Yunhe Zhao, Antony K. Liu

Faculty Publications

Arctic sea ice motion for the period from October 1999 to March 2000 derived from QuikSCAT and ocean buoy observations. Special Sensor Microwave/Imager (SSM/I) data using the wavelet analysis method agrees well with ocean buoy observations. Results from QuikSCAT and SSM/I are compatible when compared with buoy observations and complement each other. Sea ice drift merged from daily results from QuikSCAT, SSM/I, and buoy data gives more complete coverage of sea ice motion. Based on observations of six months of sea ice motion maps, the sea ice motion maps in the Arctic derived from QuikSCAT data appear to have smoother …