Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Faculty Publications

Discipline
Institution
Keyword
Publication Year
File Type

Articles 7231 - 7260 of 9001

Full-Text Articles in Entire DC Network

Posets Having Continuous Intervals, Jimmie D. Lawson, Luoshan Xu May 2004

Posets Having Continuous Intervals, Jimmie D. Lawson, Luoshan Xu

Faculty Publications

In this paper we consider posets in which each order interval [a,b] is a continuous poset or continuous domain. After developing some basic theory for such posets, we derive our major result: if X is a core compact space and L is a poset equipped with the Scott topology (assumed to satisfy a mild extra condition) for which each interval is a continuous sup-semilattice, then the function space of continuous locally bounded functions from X into L has intervals that are continuous sup-semilattices. This substantially generalizes known results for continuous domains. © 2004 Elsevier B.V. All rights reserved.

Go to article

Direct Extraction Of The Eliashberg Function For Electron-Phonon Coupling: A Case Study Of Be(1010̄), Junren Shi, S. J. Tang, Biao Wu, P. T. Sprunger, W. L. Yang, V. Brouet, X. J. Zhou, Z. Hussain, Z. X. Shen, Zhenyu Zhang, E. W. Plummer May 2004

Direct Extraction Of The Eliashberg Function For Electron-Phonon Coupling: A Case Study Of Be(1010̄), Junren Shi, S. J. Tang, Biao Wu, P. T. Sprunger, W. L. Yang, V. Brouet, X. J. Zhou, Z. Hussain, Z. X. Shen, Zhenyu Zhang, E. W. Plummer

Faculty Publications

A systematic procedure to directly extract the Eliashberg function for electron-phonon coupling was discussed using the high resolution angle-resolved photoemission spectroscopy (ARPES) data. Systematic tests were carried out to assess the effects of various parameters involved in the fitting and the robustness of the procedure against data imperfections. It was shown that the maximum entropy method (MEM) was used to overcome the data imperfections and numerical instability. It was found that ARPES allowed wider applicability and measurements along different directions compared to other traditional tunneling methods.

Go to article

Growth And Transport Properties Of Complementary Germanium Nanowire Field Effect Transistors, Andrew B. Greytak, Lincoln J. Lauhon, Mark S. Gudiksen, Charles M. Lieber May 2004

Growth And Transport Properties Of Complementary Germanium Nanowire Field Effect Transistors, Andrew B. Greytak, Lincoln J. Lauhon, Mark S. Gudiksen, Charles M. Lieber

Faculty Publications

n- and p-type Ge nanowires were synthesized by a multistep process in which axial elongation, via vapor–liquid–solid (VLS) growth, and doping were accomplished in separate chemical vapor deposition steps. Intrinsic, single-crystal, Ge nanowires prepared by Au nanocluster-mediated VLS growth were surface-doped in situ using diborane or phosphine, and then radial growth of an epitaxial Ge shell was used to cap the dopant layer. Field-effect transistors prepared from these Ge nanowires exhibited on currents and transconductances up to 850 µA/µm and 4.9 µA/V, respectively, with device yields of >85%.

Go to article

Geomorphic Analysis Of Tidal Creek Networks, Karyn Inez Novakowski, Raymond Torres, L Robert Gardner, George Voulgaris May 2004

Geomorphic Analysis Of Tidal Creek Networks, Karyn Inez Novakowski, Raymond Torres, L Robert Gardner, George Voulgaris

Faculty Publications

The purpose of this study is to determine if concepts in terrestrial channel network analysis provide insight on intertidal creek network development and to present new metrics for their analysis. We delineated creek network geometry using high-resolution digital images of intertidal marsh near Georgetown, South Carolina. Analyses reveal that intertidal creek networks may be topologically random. Length-area relationships suggest that salt marsh and terrestrial networks have similar scaling properties, although the marsh networks are more elongate than terrestrial networks. To account for recurrent water exchange between creek basins at high tide, we propose that the landscape unit of geomorphic analyses …

Go to article

Diode Laser Microwave Induced Plasma Cavity Ringdown Spectrometer: Performance And Perspective, Chuji Wang, Sudip P. Koirala, Susan T. Scherrer, Yixiang Duan, Christopher B. Winstead May 2004

Diode Laser Microwave Induced Plasma Cavity Ringdown Spectrometer: Performance And Perspective, Chuji Wang, Sudip P. Koirala, Susan T. Scherrer, Yixiang Duan, Christopher B. Winstead

Faculty Publications

Recent studies combining an atmospheric-pressure plasma source (inductively coupled plasma or microwave induced plasma) with cavity ringdown spectroscopy (plasma-CRDS) have indicated significant promise for ultra-sensitive elemental measurements. Initial plasma-CRDS efforts employed an inductively coupled plasma as the atomization source and a pulsed laser system as the light source. In an effort to improve the portability and reduce the cost of the system for application purposes, we have modified our approach to include a compact microwave induced plasma and a continuous wave diode laser. A technique for controlling the coupling of the continuous wave laser to the ringdown cavity has been …

Go to article

Properties And Performance Of The Prototype Instrument For The Pierre Auger Observatory, J. Abraham, M. Aglietta, I. C. Aguirre, M. Albrow, D. Allard, I. Allekotte, P. Allison, J. Alvarez Muñiz, M. G. Do Amaral, M. Ambrosio, L. Anchordoqui, R. Andrews, M. Anguiano, J. C. Dos Anjos, C. Aramo, S. Argiro, K. Arisaka, J. C. Arteaga, S. Atulugama, M. Ave, G. Avila, R. Baggio, X. Bai, A. F. Barbosa, H. M.J. Barbosa, D. Barnhill, S. L.C. Barroso, P. Bauleo, J. Beatty, T. Beau, K. H. Becker, J. A. Bellido, P. Bello May 2004

Properties And Performance Of The Prototype Instrument For The Pierre Auger Observatory, J. Abraham, M. Aglietta, I. C. Aguirre, M. Albrow, D. Allard, I. Allekotte, P. Allison, J. Alvarez Muñiz, M. G. Do Amaral, M. Ambrosio, L. Anchordoqui, R. Andrews, M. Anguiano, J. C. Dos Anjos, C. Aramo, S. Argiro, K. Arisaka, J. C. Arteaga, S. Atulugama, M. Ave, G. Avila, R. Baggio, X. Bai, A. F. Barbosa, H. M.J. Barbosa, D. Barnhill, S. L.C. Barroso, P. Bauleo, J. Beatty, T. Beau, K. H. Becker, J. A. Bellido, P. Bello

Faculty Publications

Construction of the first stage of the Pierre Auger Observatory has begun. The aim of the Observatory is to collect unprecedented information about cosmic rays above 1018 eV. The first phase of the project, the construction and operation of a prototype system, known as the engineering array, has now been completed. It has allowed all of the sub-systems that will be used in the full instrument to be tested under field conditions. In this paper, the properties and performance of these sub-systems are described and their success illustrated with descriptions of some of the events recorded thus far. © 2003 …

Go to article

Impossibility Of C∞ Variation Or Formal Power Series Variation In Solutions To Hilbert's 17th Problem, Charles N. Delzell May 2004

Impossibility Of C∞ Variation Or Formal Power Series Variation In Solutions To Hilbert's 17th Problem, Charles N. Delzell

Faculty Publications

No matter how a positive semidefinite polynomial f ∈ ℝ[X1,...,Xn] is represented (according to E. Artin's 1926 solution to Hilbert's 17th problem) in the form f = ∑ piri2 (with 0 ≤ Pi ∈ ℝ and ri ∈ ℝ(X1,..., Xn), the pi and the coefficients of the ri cannot be chosen to depend in a C∞ (i.e., infinitely differentiable) manner upon the coefficients of f (unless deg f ≤, 2); formal powers series variation is also impossible. This answers a question we had raised in 1990 [Contemp. Math., vol. 155, Amer. Math. Soc., 1994, pp. 107-117], where we had already …

Go to article

Control Strategies For Active Power Sharing In A Fuel-Cell-Powered Battery-Charging Station, Zhenhua Jiang, Roger A. Dougal May 2004

Control Strategies For Active Power Sharing In A Fuel-Cell-Powered Battery-Charging Station, Zhenhua Jiang, Roger A. Dougal

Faculty Publications

This paper presents an effective system design for a fuel-cell-powered battery-charging station and three control strategies for active power sharing among the batteries. This battery-charging station allows multiple batteries to be simultaneously charged. Three control strategies were investigated to coordinate the active power distribution among the battery-charging branches. The baseline control strategy Was equal rate charging. Two advanced control strategies, proportional rate charging and pulse current charging, were compared to the baseline strategy. These control strategies were realized in MaTLaB/Simulink, and the current and voltage regulations were implemented using the classical proportional-integral control approach. The system simulation was conducted in …

Go to article

Search For Qcd-Instanton Induced Events In Eeep Inelastic Ep Scattering At Hera, S. Chekanov, M. Derrick, D. Krakauer, J. H. Loizides, S. Magill, S. Miglioranzi, 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, A. Margotti, A. Montanari, R. Nania, F. Palmonari, A. Pesci, G. Sartorelli May 2004

Search For Qcd-Instanton Induced Events In Eeep Inelastic Ep Scattering At Hera, S. Chekanov, M. Derrick, D. Krakauer, J. H. Loizides, S. Magill, S. Miglioranzi, 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, A. Margotti, A. Montanari, R. Nania, F. Palmonari, A. Pesci, G. Sartorelli

Faculty Publications

A search for QCD-instanton-induced events in deep inelastic ep scattering has been performed with the ZEUS detector at the HERA collider, using data corresponding to an integrated luminosity of 38 pb-1. A kinematic range defined by cuts on the photon virtuality, Q2 > 120 GeV 2, and on the Bjorken scaling variable, x > 10-3, has been investigated. The QCD-instanton induced events were modelled by the Monte Carlo generator QCDINS. A background-independent, conservative 95% confidence level upper limit for the instanton cross section of 26 pb is obtained, to be compared with the theoretically expected value of 8.9pb.

Go to article

Identification Of An Il-17-Producing Nk1.1neg Inkt Cell Population Involved In Airway Neutrophilia, Paul B. Savage, Marie-Laure Michel, Alexandre Castro Keller, Christophe Paget, Masakazu Fujio, Francois Trottein, Chi-Huey Wong, Elke Schneider, Michael Dy, Maria C. Leite-De-Moraes Apr 2004

Identification Of An Il-17-Producing Nk1.1neg Inkt Cell Population Involved In Airway Neutrophilia, Paul B. Savage, Marie-Laure Michel, Alexandre Castro Keller, Christophe Paget, Masakazu Fujio, Francois Trottein, Chi-Huey Wong, Elke Schneider, Michael Dy, Maria C. Leite-De-Moraes

Faculty Publications

Invariant natural killer T (iNKT) cells are an important source of both T helper type 1 (Th1) and Th2 cytokines, through which they can exert beneficial, as well as deleterious, effects in a variety of inflammatory diseases. This functional heterogeneity raises the question of how far phenotypically distinct subpopulations are responsible for such contrasting activities. In this study, we identify a particular set of iNKT cells that lack the NK1.1 marker (NK1.1neg) and secrete high amounts of interleukin (IL)-17 and low levels of interferon (IFN)-{gamma} and IL-4. NK1.1neg iNKT cells produce IL-17 upon synthetic ({alpha}-galactosylceramide [{alpha}-GalCer] or PBS-57), as well …

Go to article

Removing Surface Contaminants From Silicon Wafers To Facilitate Euv Optical Characterization, Richard L. Sandberg, David D. Allred, A. L. Jackson, J. E. Johnson, W. Evans, T. Doughty, A. E. Baker, K. Adamson, A. Jacquier, R. E. Robinson Apr 2004

Removing Surface Contaminants From Silicon Wafers To Facilitate Euv Optical Characterization, Richard L. Sandberg, David D. Allred, A. L. Jackson, J. E. Johnson, W. Evans, T. Doughty, A. E. Baker, K. Adamson, A. Jacquier, R. E. Robinson

Faculty Publications

The extreme ultraviolet (EUV) is becoming increasingly important. Principal applications include orbital space-based astronomy and lithography for integrated circuit computer chips. A main impediment to further development of efficient mirrors is the lack of reliable optical constants for various materials in this region of the electromagnetic spectrum. One reason for the unreliability of the optical constants is that the sample surfaces are often contaminated with foreign material, especially organic compounds, when exposed to laboratory air. Several cleaning techniques were evaluated, namely: 1) strippable solid optical cleaner (Opticlean®); 2) oxygen plasma etch; 3) high energy UV light/ozone; 4) strippable coating followed …

Go to article

Gradient-Based Non-Linear Microstructure Design, Brent L. Adams, M. Lyon Apr 2004

Gradient-Based Non-Linear Microstructure Design, Brent L. Adams, M. Lyon

Faculty Publications

The support of this research by the Army Research Office is gratefully acknowledged. M. Lyon is supported by a National Science Foundation Graduate Research Fellowship. Fourier analysis is implemented on the orientation distribution of a polycrystalline microstructure. The linearity and convexity of the Fourier space, with respect to orientation, allows one to consider all possible distributions by considering all linear combinations of single-grain orientations. The limits of the Fourier space are therefore defined by the solutions to a set of linear programming problems. A unique approach to the linear programming, similar to the Krylov subspace methods for obtaining solutions to …

Go to article

Bohmian Dynamics On Subspaces Using Linearized Quantum Force, Vitaly A. Rassolov, Sophya Garashchuk Apr 2004

Bohmian Dynamics On Subspaces Using Linearized Quantum Force, Vitaly A. Rassolov, Sophya Garashchuk

Faculty Publications

In the de Broglie–Bohm formulation of quantum mechanics the time-dependent Schrödinger equation is solved in terms of quantum trajectories evolving under the influence of quantum and classical potentials. For a practical implementation that scales favorably with system size and is accurate for semiclassical systems, we use approximate quantum potentials. Recently, we have shown that optimization of the nonclassical component of the momentum operator in terms of fitting functions leads to the energy-conserving approximate quantum potential. In particular, linear fitting functions give the exact time evolution of a Gaussian wave packet in a locally quadratic potential and can describe the dominant …

Go to article

Unavoidable Doubly Connected Large Graphs, Guoli Ding, Peter Chen Apr 2004

Unavoidable Doubly Connected Large Graphs, Guoli Ding, Peter Chen

Faculty Publications

A connected graph is doubly connected if its complement is also connected. The following Ramsey-type theorem is proved in this paper. There exists a function h(n), defined on the set of integers exceeding three, such that every doubly connected graph on at least h(n) vertices must contain, as an induced subgraph, a doubly connected graph, which is either one of the following graphs or the complement of one of the following graphs: (1) Pn, a path on n vertices; (2) K1,ns, the graph obtained from K 1,n by subdividing an edge once; (3) K2,n\e, the graph obtained from K2,n by …

Go to article

On The Minor-Minimal 2-Connected Graphs Having A Fixed Minor, Manoel Lemos, James Oxley Apr 2004

On The Minor-Minimal 2-Connected Graphs Having A Fixed Minor, Manoel Lemos, James Oxley

Faculty Publications

Let H be a graph with κ1 components and κ 2 blocks, and let G be a minor-minimal 2-connected graph having H as a minor. This paper proves that |E(G)|-|E(H)|≤α(κ 1-1)+β(κ2-1) for all (α,β) such that α+β≥5,2α+5β≥;20, and β≥3. Moreover, if one of the last three inequalities fails, then there are graphs G and H for which the first inequality fails. © 2003 Elsevier B.V. All rights reserved.

Go to article

Coastal Wetland Subsidence Arising From Local Hydrologic Manipulations, R. Eugene Turner Apr 2004

Coastal Wetland Subsidence Arising From Local Hydrologic Manipulations, R. Eugene Turner

Faculty Publications

Twenty-three estimates of soil subsidence rates arising under the influence of local hydrologic changes from flap-gates, weirs, dikes, and culverts in tidal wetlands were compared to 75 examples of subsidence in drained agricultural wetlands. The induced subsidence rates from these hydrologic modifications in tidal wetlands can continue for more than 100 years, and range between 1.67 to 0.10 cm yr−1 within 1 to 155 years after the hydrologic modifications commence. These subsidence rates are lower than in freshwater wetlands drained for agricultural purposes, decline with age, and are significant in comparison to the rates of global sea level rise or …

Go to article

Conformational Subspace In Simulation Of Early-Stage Protein Folding, Wiktor Jurkowski, Michał Brylinski, Leszek Konieczny, Zdzisław Wiíniowski, Irena Roterman Apr 2004

Conformational Subspace In Simulation Of Early-Stage Protein Folding, Wiktor Jurkowski, Michał Brylinski, Leszek Konieczny, Zdzisław Wiíniowski, Irena Roterman

Faculty Publications

A probability calculus was used to simulate the early stages of protein folding in ab initio structure prediction. The probabilities of particular φ and ψ angles for each of 20 amino acids as they occur in crystal forms of proteins were used to calculate the amount of information necessary for the occurrence of given φ and ψ angles to be predicted. It was found that the amount of information needed to predict φ and ψ angles with 5° precision is much higher than the amount of information actually carried by individual amino acids in the polypeptide chain. To handle this …

Go to article

Affirmative Refraction: Grutter V. Bollinger Through The Lens Of The Case "The Case Of The Speluncean Explorers", Rafael Gely, Paul L. Caron Apr 2004

Affirmative Refraction: Grutter V. Bollinger Through The Lens Of The Case "The Case Of The Speluncean Explorers", Rafael Gely, Paul L. Caron

Faculty Publications

What can a fifty year-old hypothetical about human cannibalism concocted by the late Lon Fuller teach us about the Supreme Court's recent foray into the affirmative action debate in twenty-first century America? Indeed, what can a tax law professor and a labor law professor add to the cacophony of voices of leading constitutional law scholars on the Court's most important pronouncement on race in a generation? We make a rather modest claim, based on teaching both of these cases in our one-week Introduction to Law classes for incoming first year students, that a helpful way to view Grutter v. Bollinger …

Go to article

Products Of Characters And Finite P-Groups Ii, Edith Adan-Bante Apr 2004

Products Of Characters And Finite P-Groups Ii, Edith Adan-Bante

Faculty Publications

Let p be a prime number. Let G be a finite p-group and χ ∈ Irr(G). Denote by the -χ ∈ Irr(G) complex conjugate of χ . Assume that χ(1) = pn. We show that the number of distinct irreducible constituents of the product of χ-χ is at least 2n(p−1)+1.

Go to article

A Piecewise Linear Approach To Overbooking, Robert Ball, Mark J. Clement, Casey T. Deccio, Feng Huang, Quinn O. Snell Apr 2004

A Piecewise Linear Approach To Overbooking, Robert Ball, Mark J. Clement, Casey T. Deccio, Feng Huang, Quinn O. Snell

Faculty Publications

Overbooking is frequently used to increase the revenue generated by a network infrastructure without incurring additional costs. If the overbooking factor is chosen appropriately, additional virtual circuits can be admitted without degrading quality of service for existing customers. Most implementations use a single factor to accept a linear fraction of traffic requests. If a piecewise linear approach is used in admissions, additional traffic can be accepted without causing proportional increases in loss rate and utilization. This additional accepted traffic can significantly improve the profit margin for network service providers.

Go to article

Cognitive Robot Mapping With Polylines And An Absolute Space Representation, Kennard R. Laviers, Gilbert L. Peterson Apr 2004

Cognitive Robot Mapping With Polylines And An Absolute Space Representation, Kennard R. Laviers, Gilbert L. Peterson

Faculty Publications

Robot mapping even today is one of the most challenging problems in robot programming. Most successful methods use some form of occupancy grid to represent a mapped region. This approach becomes problematic if the robot is mapping a large environment, the map quickly becomes too large for processing and storage. Rather than storing the map as an occupancy grid, our robot (equipped with sonars) sees the world as a series of connected spaces. These spaces are initially mapped as an occupancy grid in a room by room fashion. As the robot leaves a space, denoted by passing through a doorway, …

Go to article

Aggressive Telecommunications Overbooking Ratios, Robert Ball, Mark J. Clement, Casey T. Deccio, Feng Huang, Quinn O. Snell Apr 2004

Aggressive Telecommunications Overbooking Ratios, Robert Ball, Mark J. Clement, Casey T. Deccio, Feng Huang, Quinn O. Snell

Faculty Publications

The Internet is comprised of vast networks of wires and fiber. A common misconception is that there is an unlimited amount of bandwidth; in reality there exists only a finite amount. Each length of wire and fiber is owned by a company, and every company wants to maximize its profit. One means of improving profit is to overbook existing transmission lines in order to increase income without increasing expenses. If too much overbooking is performed, the Quality of Service (QoS) seen by customers will decline. This paper explains a process to achieve an optimal Overbooking Ratio (OR) for admission control …

Go to article

Microsecond Spin-Flip Times In N-Gaas Measured By Time-Resolved Polarization Of Photoluminescence, John S. Colton, T. A. Kennedy, A. S. Bracker, D. Gammon Mar 2004

Microsecond Spin-Flip Times In N-Gaas Measured By Time-Resolved Polarization Of Photoluminescence, John S. Colton, T. A. Kennedy, A. S. Bracker, D. Gammon

Faculty Publications

We have observed microsecond spin-flip times in lightly doped n-GaAs, by measuring the photoluminescence polarization in the time domain with pump and probe pulses. Times up to 1.4 μs have been measured. Our results as a function of magnetic field indicated three regions governing the spin relaxation: a low field region, where spin-flip times increase due to suppression of the nuclear hyperfine interaction for localized electrons, a medium field region where spin-flip times increase due to narrowing of the hyperfine relaxation for interacting electrons, and a high field region where spin-flip times begin to level off due to the increasing …

Go to article

Prioritized Soft Constraint Satisfaction: A Qualitative Method For Dynamic Transport Selection In Heterogeneous Wireless Environments, Heidi R. Duffin, Michael A. Goodrich, Charles D. Knutson Mar 2004

Prioritized Soft Constraint Satisfaction: A Qualitative Method For Dynamic Transport Selection In Heterogeneous Wireless Environments, Heidi R. Duffin, Michael A. Goodrich, Charles D. Knutson

Faculty Publications

This paper presents Prioritized Soft Constraint Satisfaction (PSCS), a novel approach to selecting the “best” transport in dynamic wireless transport switching systems. PSCS maintains a satisfying connection to another endpoint by choosing transports based on a user-established range of preferences and priority for criteria such as speed, power, range and cost. Additionally, feedback is provided regarding tradeoffs among the criteria, thus enabling the user to adjust inputs according to the capabilities of the system. We also recommend guidelines for setting preferences and priorities.

Go to article

Dynamic Autonomous Transport Selection In Heterogeneous Wireless Environments, Jeffrey M. Brown, Heidi R. Duffin, Charles D. Knutson, Shannon B. Barnes, Ryan W. Woodings Mar 2004

Dynamic Autonomous Transport Selection In Heterogeneous Wireless Environments, Jeffrey M. Brown, Heidi R. Duffin, Charles D. Knutson, Shannon B. Barnes, Ryan W. Woodings

Faculty Publications

In this paper, we introduce Quality of Transport (QoT), an architecture for synergistically and autonomously managing session-layer protocol access to multiple transports in heterogeneous wireless environments. We present an overview of the QoT architecture including: 1) transport discovery, 2) service discovery, 3) object exchange, 4) transport switching, and 5) intelligent transport selection. Preliminary successes with our design and implementation of QoT suggest that dynamic intelligent autonomous transport switching can help to optimize user experience and session layer performance in multi-transport environments.

Go to article

Binary Frontal Polymerization: Velocity Dependence On Initial Composition, John A. Pojman, Jerry A. Griffith, H. Archie Nichols Mar 2004

Binary Frontal Polymerization: Velocity Dependence On Initial Composition, John A. Pojman, Jerry A. Griffith, H. Archie Nichols

Faculty Publications

Frontal polymerization is a mode of polymerization in which a localized zone of reaction propagates through the coupling of thermal diffusion and the Arrhenius dependence of the reaction rate. The dependence of the front propagation velocity on the initial composition has been determined in initially miscible binary systems of a free-radically cured diacrylate and an amine- or cationically cured epoxy resin. A minimum of the velocity as a function of the monomer mole fraction is observed if the two polymerizations occur independently. Excellent agreement with an analytical description was found with the diacrylate and an amine-cured epoxy but not for …

Go to article

Bose-Einstein Correlations In One And Two Dimensions In Deep Inelastic Scattering, S. Chekanov, M. Derrick, D. Krakauer, J. H. Loizides, S. Magill, S. Miglioranzi, 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, A. Margotti, A. Montanari, R. Nania, F. Palmonari, A. Pesci, G. Sartorelli Mar 2004

Bose-Einstein Correlations In One And Two Dimensions In Deep Inelastic Scattering, S. Chekanov, M. Derrick, D. Krakauer, J. H. Loizides, S. Magill, S. Miglioranzi, 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, A. Margotti, A. Montanari, R. Nania, F. Palmonari, A. Pesci, G. Sartorelli

Faculty Publications

Bose-Einstein correlations in one and two dimensions have been studied in deep inelastic ep scattering events measured with the ZEUS detector at HERA using an integrated luminosity of 121 pb-1. The correlations are independent of the virtuality of the exchanged photon, Q2, in the range 0.1 < Q2 < 8000 GeV2. There is no significant difference between the correlations in the current and target regions of the Breit frame for Q2 > 100 GeV2. The two-dimensional shape of the particle-production source was investigated, and a significant difference between the transverse and the longitudinal dimensions of the source is observed. This difference also shows no Q2 dependence. The results demonstrate that Bose-Einstein interference, and hence the size of the particle-production source, is insensitive to the hard subprocess. …

Go to article

New Enhanced Tunneling In Nuclear Processes, Boris Ivlev, Vladimir Gudkov Mar 2004

New Enhanced Tunneling In Nuclear Processes, Boris Ivlev, Vladimir Gudkov

Faculty Publications

The small sub-barrier tunneling probability of nuclear processes can be dramatically enhanced by collision with incident charged particles. Semiclassical methods of theory of complex trajectories have been applied to nuclear tunneling, and conditions for the effects have been obtained. We demonstrate the enhancement of αparticle decay by incident proton with energy of about 0.25 MeV. We show that the general features of this process are common for other sub-barrier nuclear processes and can be applied to nuclear fission.

Go to article

Effect Of Spin-Orbit Interaction And In-Plane Magnetic Field On The Conductance Of A Quasi-One-Dimensional System, Yuriy V. Pershin Dr, James A. Nesteroff, Vladimir Privman Mar 2004

Effect Of Spin-Orbit Interaction And In-Plane Magnetic Field On The Conductance Of A Quasi-One-Dimensional System, Yuriy V. Pershin Dr, James A. Nesteroff, Vladimir Privman

Faculty Publications

We study the effect of spin-orbit interaction and in-plane effective magnetic field on the conductance of a quasi-one-dimensional ballistic electron system. The effective magnetic field includes the externally applied field, as well as the field due to polarized nuclear spins. The interplay of the spin-orbit interaction with effective magnetic field significantly modifies the band structure, producing additional subband extrema and energy gaps, introducing the dependence of the subband energies on the field direction. We generalize the Landauer formula at finite temperatures to incorporate these special features of the dispersion relation. The obtained formula describes the conductance of a ballistic conductor …

Go to article

Isolated Tau Leptons In Events With Large Missing Transverse Momentum At Hera, S. Chekanov, M. Derrick, D. Krakauer, J. H. Loizides, S. Magill, S. Miglioranzi, 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, A. Margotti, A. Montanari, R. Nania, F. Palmonari, A. Pesci, G. Sartorelli Mar 2004

Isolated Tau Leptons In Events With Large Missing Transverse Momentum At Hera, S. Chekanov, M. Derrick, D. Krakauer, J. H. Loizides, S. Magill, S. Miglioranzi, 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, A. Margotti, A. Montanari, R. Nania, F. Palmonari, A. Pesci, G. Sartorelli

Faculty Publications

A search for events containing isolated tau leptons and large missing transverse momentum, not originating from the tau decay, has been performed with the ZEUS detector at the electron-proton collider HERA, using 130 pb -1 of integrated luminosity. A search was made for isolated tracks coming from hadronic tau decays. Observables based on the internal jet structure were exploited to discriminate between tau decays and quark- or gluon-induced jets. Three tau candidates were found, while 0.40 -0.13+0.12 were expected from Standard Model processes, such as charged current deep inelastic scattering and single W ±-boson production. To search for heavy-particle decays, …

Go to article

First Prev Next Last