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Cryosphere Applications Of Nscat Data, David G. Long, Mark R. Drinkwater May 1999

Cryosphere Applications Of Nscat Data, David G. Long, Mark R. Drinkwater

Faculty Publications

Though designed to measure vector winds over the ocean, new imaging techniques facilitate the use of NASA scatterometer data (NSCAT) in cryosphere studies. NSCAT provides data of unprecedented coverage, resolution, and quality which, when coupled with the scatterometer image reconstruction with filtering (SIRF) algorithm, enables images of O at resolutions approaching 8 km over stationary targets. Such images are useful in ice mapping and classification, and multidecadal studies are possible by comparison with Seasat Scatterometer (SASS) data. The utility of NSCAT data in polar ice studies is illustrated through a review of two cryosphere applications of NSCAT data: (1) sea-ice …

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Online Auctions, Michael N. Huhns, José M. Vidal May 1999

Online Auctions, Michael N. Huhns, José M. Vidal

Faculty Publications

Auctions on the Internet can involve not only consumers, but also businesses. They can form dynamically and enable the exchange of goods much as stock exchanges manage the buying and selling of securities. But because auctions have a wide scope and a short lifetime, the opportunistic behavior needed for successful interaction requires agents to both participate in and manage auctions. The article focuses on the use of software agents in such Internet based auctions

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Simulations Of Snow Distribution And Hydrology In A Mountain Basin, Melannie D. Hartman, Jill S. Baron, Richard B. Lammers, Donald W. Cline, Larry E. Band, Glen E. Liston, Christina L. Tague May 1999

Simulations Of Snow Distribution And Hydrology In A Mountain Basin, Melannie D. Hartman, Jill S. Baron, Richard B. Lammers, Donald W. Cline, Larry E. Band, Glen E. Liston, Christina L. Tague

Faculty Publications

We applied a version of the Regional Hydro‐Ecologic Simulation System (RHESSys) that implements snow redistribution, elevation partitioning, and wind‐driven sublimation to Loch Vale Watershed (LVWS), an alpine‐subalpine Rocky Mountain catchment where snow accumulation and ablation dominate the hydrologic cycle. We compared simulated discharge to measured discharge and the simulated snow distribution to photogrammetrically rectified aerial (remotely sensed) images. Snow redistribution was governed by a topographic similarity index. We subdivided each hillslope into elevation bands that had homogeneous climate extrapolated from observed climate. We created a distributed wind speed field that was used in conjunction with daily measured wind speeds to …

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Stratified Volume Diffractive Optical Elements As High Efficiency Gratings, Gregory P. Nordin, D. M. Chambers May 1999

Stratified Volume Diffractive Optical Elements As High Efficiency Gratings, Gregory P. Nordin, D. M. Chambers

Faculty Publications

We propose stratified volume diffractive optical elements as a new type of diffractive optical element that is capable of functioning as a high-efficiency grating in applications with requirements not suited to traditional holographic or diffractive optical techniques. In this approach, diffractive optical fabrication methods are used to construct an optical structure that emulates volume grating behavior. We discuss the diffraction properties of stratified volume diffractive optical elements and compare them with those used previously in both volume holographic optical elements and stratified volume holographic optical elements. A systematic design process is then presented for deriving structure parameters. We illustrate this …

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Portfolio Assessment In Aerodynamics, Nikos J. Mourtos Apr 1999

Portfolio Assessment In Aerodynamics, Nikos J. Mourtos

Faculty Publications

A new way of assessing student learning in an aerodynamics course through the use of portfolios is presented. The approach is portable to any engineering course, with a few modifications depending on content. The main idea is to allow students more responsibility for their own learning. Instead of having everyone in the class perform identical activities (homework, experiments, projects, tests, etc.), a cadre of assignments is made available to them. Students choose and perform (within reason) the ones that suit them better in terms of their own strengths and learning styles. The ultimate goal is for each student to demonstrate …

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Nutrient Enhanced Coastal Ocean Productivity In The Northern Gulf Of Mexico, William J. Wiseman Jr., Michael J. Dagg, Nancy N. Rabalais, Terry E. Whitledge Apr 1999

Nutrient Enhanced Coastal Ocean Productivity In The Northern Gulf Of Mexico, William J. Wiseman Jr., Michael J. Dagg, Nancy N. Rabalais, Terry E. Whitledge

Faculty Publications

No abstract provided.

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Ab Initio Study Of The Elastic Behavior Of Mgsio3 Ilmenite At High Pressure, Cesar R.S. Da Silva, Bijaya B. Karki, Lars Stixrude, Renata M. Wentzcovitch Apr 1999

Ab Initio Study Of The Elastic Behavior Of Mgsio3 Ilmenite At High Pressure, Cesar R.S. Da Silva, Bijaya B. Karki, Lars Stixrude, Renata M. Wentzcovitch

Faculty Publications

We investigate the athermal high pressure behavior of the elastic properties of MgSiO ilmenite up to 30 GPa using the ab initio pseudopotential method. Our results at zero pressure are in good agreement with single-crystal elasticity measurements. The elastic anisotropy is shown to decrease slightly under compression and hence to remain substantial (25 to 20% shear wave anisotropy and 16 to 10% longitudinal wave anisotropy) over the pressure regime studied. The directions of fastest and slowest wave propagation are found to change slightly with pressure as determined by the pressure dependence of c and c . Comparisons with the elastic …

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From Jeans To Genes: The Evolving Nature Of Property Of The Estate, A. Mechele Dickerson Apr 1999

From Jeans To Genes: The Evolving Nature Of Property Of The Estate, A. Mechele Dickerson

Faculty Publications

No abstract provided.

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Monopoly Bundling In Cyberspace: How Many Products Does Microsoft Sell?, Alan J. Meese Apr 1999

Monopoly Bundling In Cyberspace: How Many Products Does Microsoft Sell?, Alan J. Meese

Faculty Publications

No abstract provided.

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The Probability Distribution Of Nscat Measurements, Paul E. Johnson, David G. Long Mar 1999

The Probability Distribution Of Nscat Measurements, Paul E. Johnson, David G. Long

Faculty Publications

NSCAT makes only indirect measurements of wind. The direct measurement is of the backscattered radar power. The signal power is contaminated by radiometric noise so a separate measurement of the noise power is subtracted from the signal-plus-noise measurement to estimate the backscattered power. Using the radar equation, sigma-0 is computed from the measured signal power. From multiple sigma-0 mesaurements made at different azimuth angles, the wind is estimated. In wind retrieval, the NSCAT sigma-0 measurements are assumed to have a Gaussian probability distribution with a variance which depends on the mean. Given this distribution model, the maximum-likelihood estimtor is formed …

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Observations Of Lattice Curvature Near The Interface Of A Deformed Aluminium Bicrystal, Brent L. Adams, W. E. King, S. Sun Mar 1999

Observations Of Lattice Curvature Near The Interface Of A Deformed Aluminium Bicrystal, Brent L. Adams, W. E. King, S. Sun

Faculty Publications

This work was partially supported by MRSEC Program of the National Science Foundation (DMR-9632556), and under the auspices of the US Department of Energy and Lawrence Livermore National Laboratory under contract W-7405- Eng-48. S. Sun gratefully acknowledges the comments of Professor E. T. Onat, Professor B. T. Chu and Professor W. Tong of the Mechanical Engineering Department at Yale University, and their valuable guidance in the process of completing this project as a doctoral dissertation. The assistance of B. El-Dasher of Carnegie-Mellon University is also gratefully acknowledged. Reported here is a study of the pattern of lattice curvature near the …

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The Boundaries Of The Silenced Hmr Domain In Saccharomyces Cerevisiae, David Donze, Christopher R. Adams, Jasper Rine, Rohinton T. Kamakaka Mar 1999

The Boundaries Of The Silenced Hmr Domain In Saccharomyces Cerevisiae, David Donze, Christopher R. Adams, Jasper Rine, Rohinton T. Kamakaka

Faculty Publications

The chromosomes of eukaryotes are organized into structurally and functionally discrete domains that provide a mechanism to compact the DNA as well as delineate independent units of gene activity. It is believed that insulator/boundary elements separate these domains. Here we report the identification and characterization of boundary elements that flank the transcriptionally repressed HMR locus in the yeast Saccharomyces cerevisiae. Deletion of these boundary elements led to the spread of silenced chromatin, whereas the ectopic insertion of these elements between a silencer and a promoter blocked the repressive effects of the silencer on that promoter at HMR and at telomeres. …

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Orientation Of Heparin-Binding Sites In Native Vitronectin. Analyses Of Ligand Binding To The Primary Glycosaminoglycan-Binding Site Indicate That Putative Secondary Sites Are Not Functional, Angelia D. Gibson, John A. Lamerdin, Ping Zhuang, Kunnumal Baburaj, Engin H. Serpersu, Cynthia B. Peterson Mar 1999

Orientation Of Heparin-Binding Sites In Native Vitronectin. Analyses Of Ligand Binding To The Primary Glycosaminoglycan-Binding Site Indicate That Putative Secondary Sites Are Not Functional, Angelia D. Gibson, John A. Lamerdin, Ping Zhuang, Kunnumal Baburaj, Engin H. Serpersu, Cynthia B. Peterson

Faculty Publications

A primary heparin-binding site in vitronectin has been localized to a cluster of cationic residues near the C terminus of the protein. More recently, secondary binding sites have been proposed. In order to investigate whether the binding site originally identified on vitronectin functions as an exclusive and independent heparin-hinding domain, solution binding methods have been used in combination with MR and recombinant approaches to evaluate ligand binding to the primary site. Evaluation of the ionic strength dependence of heparin binding to vitronectin according to classical linkage theory indicates that a single ionic bond is prominent. It had been previously shown …

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Constructions Of Generalized Concatenated Codes And Their Trellis-Based Decoding Complexity, Robert H. Morelos-Zaragoza, Toru Fujiwara, Tadao Kasami, Shu Lin Mar 1999

Constructions Of Generalized Concatenated Codes And Their Trellis-Based Decoding Complexity, Robert H. Morelos-Zaragoza, Toru Fujiwara, Tadao Kasami, Shu Lin

Faculty Publications

In this correspondence, constructions of generalized concatenated (GC) codes with good rates and distances are presented. Some of the proposed GC codes have simpler trellis omplexity than Euclidean geometry (EG), Reed–Muller (RM), or Bose–Chaudhuri–Hocquenghem (BCH) codes of approximately the same rates and minimum distances, and in addition can be decoded with trellis-based multistage decoding up to their minimum distances. Several codes of the same length, dimension, and minimum distance as the best linear codes known are constructed.

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Combustion Properties Of Biomass, B. M. Jenkins, Larry Lin Baxter 8507091, T. R. Miles Jr, T. R. Miles Mar 1999

Combustion Properties Of Biomass, B. M. Jenkins, Larry Lin Baxter 8507091, T. R. Miles Jr, T. R. Miles

Faculty Publications

Properties of biomass relevant to combustion are briefly reviewed. The compositions of biomass among fuel types are variable, especially with respect to inorganic constituents important to the critical problems of fouling and slagging. Alkali and alkaline earth metals, in combination with other fuel elements such as silica and sulfur, and facilitated by the presence of chlorine, are responsible for many undesirable reactions in combustion furnaces and power boilers. Reductions in the concentrations of alkali metals and chlorine, created by leaching the elements from the fuel with water, yield remarkable improvements in ash fusion temperatures and confirm much of what is …

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The Behavior Of Inorganic Material In Biomass-Fired Power Boilers: Field And Laboratory Experiences, Larry Lin Baxter 8507091, Thomas R. Miles, Thomas R. Miles Jr, Bryan M. Jenkins, Thomas Milne, David Dayton, Richard W. Bryers, Larry L. Oden Mar 1999

The Behavior Of Inorganic Material In Biomass-Fired Power Boilers: Field And Laboratory Experiences, Larry Lin Baxter 8507091, Thomas R. Miles, Thomas R. Miles Jr, Bryan M. Jenkins, Thomas Milne, David Dayton, Richard W. Bryers, Larry L. Oden

Faculty Publications

This paper highlights some of the major findings of the Alkali Deposits Investigation, a collaborative effort to understand the causes of unmanageable ash deposits in biomass-fired electric power boilers. A group of interested industrial institutions and the US DOE Energy Efficiency and Renewable Energy Office's Biomass Power Program through the National Renewable Energy Laboratory jointly sponsored the project. The industries contributed both funding and, in most cases, use of facilities to the project and included Mendota Biomass Power and Woodland Biomass Power (both associated with Thermo Electron Energy Systems), CMS Generation Operating (formerly Hydra-Co Operations), Wheelabrator, Shasta and Hudson Energy, …

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Digital Image Managers For The New Millennium: A Museum/University Collaboration, Samantha K. Hastings, Museums And The Web 1999 Mar 1999

Digital Image Managers For The New Millennium: A Museum/University Collaboration, Samantha K. Hastings, Museums And The Web 1999

Faculty Publications

The University of North Texas and the African American Museum in Dallas are partners in a program designed to produce expert managers of digital images and information. The School of Library and Information Sciences in cooperation with the School of Visual Arts received a grant from the federal Institute of Museum and Library services to build a collaborative program that includes a digital imaging laboratory and fellowships for students in a Certificate of Advanced Study Program. The work of the digital image manager includes the production of visual images, the creation and management of databases and the ability to use …

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Determination Of A Methane Intermolecular Potential Model For Use In Molecular Simulations From Ab Initio Calculations, Richard L. Rowley, Tapani A. Pakkanen Feb 1999

Determination Of A Methane Intermolecular Potential Model For Use In Molecular Simulations From Ab Initio Calculations, Richard L. Rowley, Tapani A. Pakkanen

Faculty Publications

The possibility of obtaining an accurate site-site potential model suitable for use in molecular dynamics (MD) simulations of methane from ab initio calculations has been explored. Counterpoise-corrected (CPC), supermolecule, ab initio energies at the MP2/6-311 + G(2df,2pd) level were computed for eleven relative orientations of two methane molecules as a function of C-C separation distance. C-C, C-H, and H-H interaction parameters in a pairwise-additive, site-site potential model for rigid methane molecules were regressed from the ab initio energies, and the resultant model accurately reproduced the ab initio energies. The model suggests that C-H attractions are dominant in weakly binding the …

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A Decision-Oriented Framework For Evaluating Deployment Strategies For Intelligent Transportation Systems, H.-S. Jacob Tsao Feb 1999

A Decision-Oriented Framework For Evaluating Deployment Strategies For Intelligent Transportation Systems, H.-S. Jacob Tsao

Faculty Publications

Because Intelligent Transportation Systems (ITS) R&D is performed for the ultimate deployment in the real world, deployment issues may limit design options for ITS concepts and technologies and, hence, can be viewed as constraints on ITS R&D. Therefore, ITS deployment issues must be studied at the outset of the R&D process. This paper develops a framework to help recognize and organize such issues. The findings can be used by ITS researchers in developing deployable ITS concepts and technologies and by ITS promoters in deploying ITS technologies having been developed already. Based on a focus on decisions impacting the deployment of …

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Are There Ways To Enhance China's Food Security?, B. Gardner Delworth, Yahui Zhao Feb 1999

Are There Ways To Enhance China's Food Security?, B. Gardner Delworth, Yahui Zhao

Faculty Publications

Chinese officials and newspapers express considerable concern about the country's capacity to feed its huge and still growing population. The rhetoric will be familiar to people in Western countries as a blend of "agrarian fundamentalism" and "Malthusianism." But beyond the official rhetoric, we will argue that reforms in land ownership and irrigation water pricing and management could have highly salutary impacts on agricultural output that could alleviate food shortages far into the future.

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Burnett Description For Plane Poiseuille Flow, Alejandro Garcia, F. Uribe Jan 1999

Burnett Description For Plane Poiseuille Flow, Alejandro Garcia, F. Uribe

Faculty Publications

Two recent works have shown that at small Knudsen number ~K! the pressure and temperature profiles in plane Poiseuille flow exhibit a different qualitative behavior from the profiles obtained by the Navier-Stokes equations. Tij and Santos [J. Stat. Phys. 76, 1399 (1994)] used the Bhatnagar-Gross-Kook model to show that the temperature profile is bimodal and the pressure profile is nonconstant. Malek-Mansour, Baras, and Garcia [Physica A 240, 255 (1997)] qualitatively confirmed these predictions in computer experiments using the direct simulation Monte Carlo method (DSMC). In this paper we compare the DSMC measurements of hydrodynamic variables and non-equilibrium fluxes with numerical …

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Spatial And Temporal Factors In Estimating The Potential Of Ride-Sharing For Demand Reduction, H.-S. Jacob Tsao, Da-Jie Lin Jan 1999

Spatial And Temporal Factors In Estimating The Potential Of Ride-Sharing For Demand Reduction, H.-S. Jacob Tsao, Da-Jie Lin

Faculty Publications

Traffic congestion has been a pervasive problem in many urban areas of this country. This paper studies the potential of carpooling among unrelated partners (i.e., inter-household carpooling) for demand reduction during peak commute hours. Basic questions about this potential include the following. Can the current population density, origin-destination distribution, tolerable pick-up and drop-off delays, departure time distribution, and the tolerance for deviation from preferred departure time support a sizable carpooling population that can make a significant contribution to traffic demand reduction? Could the proportion of long trips that are likely candidates for carpooling (e.g., those long trips with same O-D) …

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Frost Heaving Of Container Hardwood Seedlings Planted In An Abandoned Agriculitural Field In Sharkey County, Mississippi, Matthew C. Stroupe, Hans M. Williams Jan 1999

Frost Heaving Of Container Hardwood Seedlings Planted In An Abandoned Agriculitural Field In Sharkey County, Mississippi, Matthew C. Stroupe, Hans M. Williams

Faculty Publications

The use of container hardwood seedlings is an alternative to bareroot planting stock. In January 1996, 1,485 container seedlings of Nuttall oak (Quercus nuttallii Palmer), willow oak (Q. phellos L.). overcup oak (Q. lyrata Walter), and water oak (Q. nigra L.) were planted in Sharkey clay on an abandoned agricultural field situated in the Lower Mississippi River Alluvial Valley. Beginning with the passage of a cold front on January 31, daily minimum temperatures dipped as low as 6 °F. For 5 days, dally high temperatures did not climb above 32 °F. This cold period caused 33.7 …

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Iconic Animation Of Construction Simulation, Jonathan Jingsheng Shi, H. Zhang Jan 1999

Iconic Animation Of Construction Simulation, Jonathan Jingsheng Shi, H. Zhang

Faculty Publications

This paper presents a continuous research effort the animation function in the development of the Activity-Based Construction (ABC) modeling and simulation system. ABC animation uses the constructed ABC simulation model as the animation background; and pre-created images of simulation entities move around along individual execution paths on the ABC model. A library of icons consisting of common construction entities has been created in the ABC system. To perform animation function in ABC only involves one simple additional task for the user to select an appropriate icon for a simulation entity.

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Digital Recording Of Real Estate Conveyances, Dale A. Whitman Jan 1999

Digital Recording Of Real Estate Conveyances, Dale A. Whitman

Faculty Publications

The purpose of this article is to describe how such a revolutionary change in the recording system can take place, and to identify and discuss the major policy issues that must be resolved in order to accomplish it. This change ought to happen. Failure to update the system will result in the continued imposition of unnecessary costs and delays on those who buy, sell, or mortgage real estate in America.

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Myths, Miscues, And Misconceptions: No-Aid Separationism And The Establishment Clause, Carl H. Esbeck Jan 1999

Myths, Miscues, And Misconceptions: No-Aid Separationism And The Establishment Clause, Carl H. Esbeck

Faculty Publications

In neutrality theory the recipients of vouchers, grants, and purchase-of-service contracts are eligible to participate as providers in government social service programs without regard to their religious character. Indeed, religious beliefs and practices are prohibited bases for screening out those who want to be welfare program providers. Notable examples of congressional social service legislation conforming to the rule of religious neutrality are the ‘charitable choice‘ feature imbedded in the Welfare Reform Act of 1996 and the Community Services Block Grant Act of 1998, as well as the provision allowing issuance of child care vouchers to indigent parents in the Child …

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A Good Home For A Poor Man: Fort Polk And Vernon Parish, 1800-1940, Steven D. Smith Jan 1999

A Good Home For A Poor Man: Fort Polk And Vernon Parish, 1800-1940, Steven D. Smith

Faculty Publications

No abstract provided.

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Protein And Ligand Adaptation In A Retinoic Acid Binding Protein, Rekha Pattanayek, Marcia E. Newcomer Jan 1999

Protein And Ligand Adaptation In A Retinoic Acid Binding Protein, Rekha Pattanayek, Marcia E. Newcomer

Faculty Publications

A retinoic acid binding protein isolated from the lumen of the rat epididymis (ERABP) is a member of the lipocalin superfamily. ERABP binds both the all-trans and 9-cis isomers of retinoic acid, as well as the synthetic retinoid (E)-4-[2-(5,6,7,8)-tetrahydro-5,5,8,8-tetramethyl-2 napthalenyl-1 propenyl]-benzoic acid (TTNPB), a structural analog of all-trans retinoic acid. The structure of ERABP with a mixture of all-trans and 9-cis retinoic acid has previously been reported. To elucidate any structural differences in the protein when bound to the all-trans and 9-cis isomers, the structures of all-trans retinoic acid-ERABP and 9-cis retinoic acid ERABP were determined. Our results indicate that …

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Genetic Analysis Of The Role Of Herpes Simplex Virus Type 1 Glycoprotein K In Infectious Virus Production And Egress, Timothy P. Foster, Konstantin G. Kousoulas Jan 1999

Genetic Analysis Of The Role Of Herpes Simplex Virus Type 1 Glycoprotein K In Infectious Virus Production And Egress, Timothy P. Foster, Konstantin G. Kousoulas

Faculty Publications

Herpes simplex virus type 1 (KOS)ΔgK is a mutant virus which lacks glycoprotein K (gK) and exhibits defects in virion egress (S. Jayachandra, A. Baghian, and K. G. Kousoulas, J. Virol. 69:5401-5413, 1997). To further understand the role of gK in virus egress, we constructed recombinant viruses, ΔgKhpd-1, -2, -3, and -4, that specified gK amino-terminal portions of 139, 239, 268, and 326 amino acids, respectively, corresponding to truncations immediately after each of the four putative membrane-spanning domains of gK. ΔgKhpd-1 and ΔgKhpd-2 viruses produced lower yields and smaller plaques than ΔgK. Numerous ΔgKhpd-1 capsids accumulated predominately within large double-membrane …

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Measurement Of Jet Shapes In High-Q2 Deep Inelastic Scattering At Hera, J. Breitweg, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, R. Yoshida, H. Zhang, Margarita C. K. Mattingly, F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, G. Cara Romeo, G. Castellini, L. Cifarelli, F. Cindolo, A. Contin, N. Coppola, M. Corradi, S. De Pasquale, P. Giusti, G. Iacobucci, G. Laurenti Jan 1999

Measurement Of Jet Shapes In High-Q2 Deep Inelastic Scattering At Hera, J. Breitweg, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, R. Yoshida, H. Zhang, Margarita C. K. Mattingly, F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, G. Cara Romeo, G. Castellini, L. Cifarelli, F. Cindolo, A. Contin, N. Coppola, M. Corradi, S. De Pasquale, P. Giusti, G. Iacobucci, G. Laurenti

Faculty Publications

The shapes of jets with transverse energies, EjetT, up to 45 GeV produced in neutral- and charged-current deep inelastic e+p scattering (DIS) at Q2 > 100 GeV2 have been measured with the ZEUS detector at HERA. Jets are identified using a cone algorithm in the η-φ plane with a cone radius of one unit. The jets become narrower as EjetT increases. The jet shapes in neutral- and charged-current DIS are found to be very similar. The jets in neutral-current DIS are narrower than those in resolved processes in photoproduction and closer to those in direct-photon processes for the same ranges in …

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