Resource Type

119 Matching Results

Results open in a new window/tab.

Brain, Music, and Non-Poisson Renewal Processes (open access)

Brain, Music, and Non-Poisson Renewal Processes

Article discussing research that shows both music composition and brain function, as revealed by the electroencephalogram (EEG) analysis, are renewal non-Poisson processes living in the nonergodic dominion.
Date: June 21, 2007
Creator: Bianco, Simone; Ignaccolo, Massimiliano; Rider, Mark S.; Ross, Mary J.; Winsor, Phil & Grigolini, Paolo
System: The UNT Digital Library
A group contribution model for determining the sublimation enthalpy of organic compounds at the standard reference temperature of 298 K (open access)

A group contribution model for determining the sublimation enthalpy of organic compounds at the standard reference temperature of 298 K

Article discussing a group contribution model for determining the sublimation enthalpy of organic compounds at the standard reference temperature of 298 K.
Date: June 21, 2013
Creator: Gharagheizi, Farhad; Ilani-Kashkouli, Poorandokht; Acree, William E. (William Eugene); Mohammadi, Amir H. & Ramjugernath, Deresh
System: The UNT Digital Library
Protein Sequence Classification Using Feature Hashing (open access)

Protein Sequence Classification Using Feature Hashing

Article on protein sequence classification using feature hashing.
Date: June 21, 2012
Creator: Caragea, Cornelia; Silvescu, Adrian & Mitra, Prasenjit
System: The UNT Digital Library
First-principles theory of metal-alkaline earth oxide interfaces (open access)

First-principles theory of metal-alkaline earth oxide interfaces

Article on the first-principles theory of metal-alkaline earth oxide interfaces.
Date: June 21, 2006
Creator: Nuñez, Matías & Buongiorno Nardelli, Marco
System: The UNT Digital Library
Regioselective synthesis of plant (iso)flavone glycosides in Escherichia coli (open access)

Regioselective synthesis of plant (iso)flavone glycosides in Escherichia coli

Article on regioselective synthesis of plant (iso)flavone glycosides in Escherichia coli.
Date: June 21, 2008
Creator: He, Xian-Zhi; Li, Wen-Sheng; Blount, Jack W. & Dixon, R. A.
System: The UNT Digital Library
New result on K{sup +} {r_arrow} {pi}{sup +} {nu}{bar {nu}} from BNL E787 (open access)

New result on K{sup +} {r_arrow} {pi}{sup +} {nu}{bar {nu}} from BNL E787

E787 at BNL has reported evidence for the rare decay K{sup +} {r_arrow} {pi}{sup +}{nu}{bar {nu}}, based on the observation of one candidate event. In this paper, we present the result of analyzing a new dataset of comparable sensitivity to the published result.
Date: June 21, 1999
Creator: REDLINGER,G.
System: The UNT Digital Library
Hybrid electric vehicles TOPTEC (open access)

Hybrid electric vehicles TOPTEC

This one-day TOPTEC session began with an overview of hybrid electric vehicle technology. Updates were given on alternative types of energy storage, APU control for low emissions, simulation programs, and industry and government activities. The keynote speech was about battery technology, a key element to the success of hybrids. The TOPEC concluded with a panel discussion on the mission of hybrid electric vehicles, with a perspective from industry and government experts from United States and Canada on their view of the role of this technology.
Date: June 21, 1994
Creator: unknown
System: The UNT Digital Library
FUTURE KAON INITIATIVES AT BNL. (open access)

FUTURE KAON INITIATIVES AT BNL.

Although the Brookhaven AGS will become an injector to RHIC, it will still be available for external proton beam experiments. I discuss a number new K decay experiments which have been proposed for this facility.
Date: June 21, 1999
Creator: LITTENBERG,L.
System: The UNT Digital Library
Project SAPPHIRE uranium-beryllium dose rate analysis (open access)

Project SAPPHIRE uranium-beryllium dose rate analysis

During a six-week period in the fall of 1994 a team of 31 US government and Y-12 personnel packaged and removed several thousand kilograms of material containing highly enriched uranium from the (former Soviet Union) Republic of Kazakhstan for interim storage at the Y-12 Plant in Oak Ridge, Tennessee. This classified mission, known as PROJECT SAPPHIRE, had been initiated at the request of the Kazakhstan government in order to rid itself of possible security problems. Planning for the mission included assurance of the health and safety of the team members, as well as compliance with all local, IAEA, and US government regulations regarding the handling, packaging, transportation, and storage of radioactive and fissile material. The mission classification restrictions were relaxed following the return of the team and material to the United States. The material to be removed, in the form of small billets and rods of uranium metal and uranium-beryllium alloy and oxide powder, was sealed by team members on site into two-liter steel cans. Two or three cans each were loaded into more than 400 IAEA certified fissile material shipping container, and each container was packed into a large steel drum for transport by US Air Force cargo planes …
Date: June 21, 1995
Creator: Cramer, S. N.; Lewis, K. D. & Moses, S. D.
System: The UNT Digital Library
Calculation of the cross section for top quark production (open access)

Calculation of the cross section for top quark production

The authors summarize calculations of the cross section for top quark production at hadron colliders within the context of perturbative quantum chromodynamics, including resummation of the effects of initial-state soft gluon radiation to all orders in the strong coupling strength. In their approach they resume the universal leading-logarithm contributions, and they restrict the calculation to the region of phase space that is demonstrably perturbative. They compare the approach with other methods. They present predictions of the physical cross section as a function of the top quark mass in proton-antiproton reactions at center-of-mass energies of 1.8 and 2.0 TeV, and they discuss estimated uncertainties.
Date: June 21, 1996
Creator: Berger, E. L. & Contopanagos, H.
System: The UNT Digital Library
Designing for sustainability: Preprint (open access)

Designing for sustainability: Preprint

In addition to impacting non-renewable energy supplies, buildings world wide contribute to climate change by being responsible for the release of carbon dioxide, either directly through combustion of carbon-based fuels or indirectly through electricity consumption from carbon fuels. Engineers and architects have an obligation to design for sustainability. This paper addresses each step in the building design process from inception to occupancy. Recommendations and examples of how sustainability can be achieved are given using two examples of actual buildings that have low energy use and minimal impact on the environment. In addition, these buildings have life cycle costs comparable to conventional buildings and provide comfortable, healthy, and productive indoor environments.
Date: June 21, 2000
Creator: Hayter, S.; Torcellini, P. & Judkoff, R.
System: The UNT Digital Library
Using the whole-building design approach to incorporate daylighting into a retail space: Preprint (open access)

Using the whole-building design approach to incorporate daylighting into a retail space: Preprint

This paper focuses on implementation of daylighting into the Bighorn Center, a collection of home improvement retail spaces in Silverthorne, Colorado, which were constructed in three phases. Daylighting was an integral part of the design of the Phase 3 building. Energy consultants optimized the daylighting design through detailed modeling using an hourly building energy simulation tool. Energy consultants also used this tool to address the building owner's concerns related to customer comfort and increased product sales.
Date: June 21, 2000
Creator: Hayter, S.; Torcellini, P.; Eastment, M. & Judkoff, R.
System: The UNT Digital Library
Fuel conditioning facility zone-to-zone transfer administrative controls. (open access)

Fuel conditioning facility zone-to-zone transfer administrative controls.

The administrative controls associated with transferring containers from one criticality hazard control zone to another in the Argonne National Laboratory (ANL) Fuel Conditioning Facility (FCF) are described. FCF, located at the ANL-West site near Idaho Falls, Idaho, is used to remotely process spent sodium bonded metallic fuel for disposition. The process involves nearly forty widely varying material forms and types, over fifty specific use container types, and over thirty distinct zones where work activities occur. During 1999, over five thousand transfers from one zone to another were conducted. Limits are placed on mass, material form and type, and container types for each zone. Ml material and containers are tracked using the Mass Tracking System (MTG). The MTG uses an Oracle database and numerous applications to manage the database. The database stores information specific to the process, including material composition and mass, container identification number and mass, transfer history, and the operators involved in each transfer. The process is controlled using written procedures which specify the zone, containers, and material involved in a task. Transferring a container from one zone to another is called a zone-to-zone transfer (ZZT). ZZTs consist of four distinct phases, select, request, identify, and completion.
Date: June 21, 2000
Creator: Pope, Chad L.
System: The UNT Digital Library
Power Quality Evaluation of 480-V, 2-MVA UPS Systems (open access)

Power Quality Evaluation of 480-V, 2-MVA UPS Systems

A mobile 480-V, 2-MVA UPS System utilizing battery energy storage was installed at S and C Electric Company's Polymer Products Fabrication Building in Chicago, Illinois in May 1999 to provide uninterrupted power to the building for up to 15 seconds in the event of a voltage sag or momentary interruption in the local utility supply. Similar units can be applied at medium voltage through the application of a step-up transformer to provide momentary power disturbance ride through of up to 30 seconds for loads up to 15 MVA at system voltages ranging from 4.16 kV to 34.5 kV. A power quality evaluation of the installation was performed over a six-month period from July 1999 to early January 2000. This paper describes the details and results of this power quality evaluation, which involved two phases. Phase I involved the collection and review of power disturbance data and the effects on process equipment, while Phase II involved power quality monitoring of utility source and building load voltages and currents over a period of six months. Review of power disturbance data and equipment power-disturbance ride-through characteristics during Phase I of the project indicated that the polymer fabrication process in the building is affected …
Date: June 21, 2000
Creator: Camm, E. H.; Corey, Garth P. & Roberts, S. B.
System: The UNT Digital Library
A Collective Collision Operator for DSMC (open access)

A Collective Collision Operator for DSMC

A new scheme to simulate elastic collisions in particle simulation codes is presented. The new scheme aims at simulating the collisions in the highly collisional regime, in which particle simulation techniques typically become computationally expensive.The new scheme is based on the concept of a grid-based collision field. According to this scheme, the particles perform a single collision with the background grid during a time step. The properties of the background field are calculated from the moments of the distribution function accumulated on the grid. The collision operator is based on the Langevin equation. Based on comparisons with other methods, it is found that the Langevin method overestimates the collision frequency for dilute gases.
Date: June 21, 2000
Creator: GALLIS,MICHAIL A. & TORCZYNSKI,JOHN R.
System: The UNT Digital Library
The Very Large Hadron Collider: The farthest energy frontier (open access)

The Very Large Hadron Collider: The farthest energy frontier

The Very Large Hadron Collider (or Eloisatron) represents what may well be the final step on the energy frontier of accelerator-based high energy physics. While an extremely high luminosity proton collider at 100-200 TeV center of mass energy can probably be built in one step with LHC technology, that machine would cost more than what is presently politically acceptable. This talk summarizes the strategies of collider design including staged deployment, comparison with electron-positron colliders, opportunities for major innovation, and the technical challenges of reducing costs to manageable proportions. It also presents the priorities for relevant R and D for the next few years.
Date: June 21, 2001
Creator: Barletta, William A.
System: The UNT Digital Library
Stochastic Modeling of Rechargeable Battery Life in a Photovoltaic Power System (open access)

Stochastic Modeling of Rechargeable Battery Life in a Photovoltaic Power System

None
Date: June 21, 2000
Creator: Urbina, Angel; Paez, Thomas L. & Jungst, Rudolph G.
System: The UNT Digital Library
Position-sensitive germanium detectors for gamma-ray imaging and spectroscopy (open access)

Position-sensitive germanium detectors for gamma-ray imaging and spectroscopy

None
Date: June 21, 2000
Creator: Amman, Mark & Luke, Paul
System: The UNT Digital Library
Experimental Investigation of High Temperature Superconducting Imaging Surface Magnetometry (open access)

Experimental Investigation of High Temperature Superconducting Imaging Surface Magnetometry

The behavior of high temperature superconducting quantum interference devices (SQUIDs) in the presence of high temperature superconducting surfaces has been investigated. When current sources are placed close to a superconducting imaging surface (SIS) an image current is produced due to the Meissner effect. When a SQUID magnetometer is placed near such a surface it will perform in a gradiometric fashion provided the SQUID and source distances to the SIS are much less than the size of the SIS. We present the first ever experimental verification of this effect for a high temperature SIS. Results are presented for two SQUID-SIS configurations, using a 100 mm diameter YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} disc as the SIS. These results indicate that when the current source and sensor coil (SQUID) are close to the SIS, the behavior is that of a first-order gradiometer. The results are compared to analytic solutions as well as the theoretical predictions of a finite element model.
Date: June 21, 1999
Creator: Espy, M. A.; Matlachov, A. N. & Kraus, R. H., Jr.
System: The UNT Digital Library
LTS Gradiometers Based-On Superconducting Imaging Surface Design (open access)

LTS Gradiometers Based-On Superconducting Imaging Surface Design

Gradiometer-like devices can be built using a superconducting imaging surface design. Such devices behave similarly to conventional wire-wound gradiometers for nearby magnetic sources. A large gradiometer array can be built by placing SQUID magnetometers close to the surface of a large superconducting plane. The most attractive advantage of such a gradiometer array is the ability to change a baseline for all channels simultaneously by mechanically moving the superconducting imaging surface relative to the sensor array. This can easily be accomplished even when the gradiometer array is cold. We built, experimentally tested, and simulated both first- and second-order gradiometer-like devices with adjustable baseline using the superconducting imaging surface design. First-order radial gradiometer sensors were made by placing planar magnetometers parallel to and near the superconducting imaging surface. A second-order electronic gradiometer was realized by subtracting the output from two of the first-order gradiometers described above.
Date: June 21, 1999
Creator: Matlachov, A. N.; Kraus, R. H., Jr. & Espy, M. A.
System: The UNT Digital Library
Multiparticle dynamics in the E-phi tracking code ESME (open access)

Multiparticle dynamics in the E-phi tracking code ESME

ESME has developed over a twenty year period from its origins as a program for modeling rf gymnastics to a rather general facility for that fraction of beam dynamics of synchrotrons and storage rings which can be properly treated in the two dimensional longitudinal phase space. The features of this program which serve particularly for multiparticle calculations are described, some underling principles are noted, and illustrative results are given.
Date: June 21, 2002
Creator: MacLachlan, James A.
System: The UNT Digital Library
205 kA pulse power supply for neutrino focusing horns (open access)

205 kA pulse power supply for neutrino focusing horns

A new underground beamline is being constructed at Fermilab to generate and focus a beam of neutrinos on a detector 450 miles away in Soudan, Minnesota. A compact modulator utilizing capacitive energy storage and SCRs as the switching element has been built and tested at Fermilab. The 0.9 F capacitor bank operates at less than 1 kV. It delivers its output of up to 240 kA directly to the two series connected focusing horns via a multi-layer radiation hard stripline [1]. Dual pulse width capability allows for ready selection of 5.2 ms, for slow beam spills, or 2.6 ms operation for reduced thermal stresses on the focusing horns during fast spill. Intended for installation in an underground equipment room, the design incorporates several novel features to facilitate transport, installation, and maintenance. Various designs were examined to arrive at the most economical approach for providing the high pulse currents to the horns located in the very high radiation field, up to 3 x 10{sup 7} kRads/yr absorbed dose of the beamline. These included charge recovery and electronic polarity reversal systems. The direct coupling approach was selected for its overall economy and compactness. The system has been operational for several months and …
Date: June 21, 2002
Creator: Kenneth R. Bourkland, Kevin Roon and David Tinsley
System: The UNT Digital Library
First Principles Thermoelasticity of Tantalum at High Pressures (open access)

First Principles Thermoelasticity of Tantalum at High Pressures

The thermoelastic properties of bcc tantalum have been investigated over a broad range of temperatures (up to 12000 K) and pressures (up to 10 Mbar) using first-principles methods that account for cold, electron-thermal, and ion-thermal contributions. Specifically, we have combined ab initio all electron electronic-structure calculations for the cold and electron-thermal contributions to the elastic moduli with phonon contributions for the ion-thermal part calculated using model generalized pseudopotential theory (MGPT). For the latter, a summation of terms over the Brillouin zone is performed within the quasi-harmonic approximation, where each term is composed of a strain derivative of the phonon frequency at a particular k-point. At ambient pressure, the resulting temperature dependence of the elastic moduli is in excellent agreement with ultrasonic measurements. The experimentally observed anomalous behavior of C44 at low temperatures is shown to originate from the electron-thermal contribution. At higher temperatures, the dominant contribution to the temperature dependence of the elastic moduli comes from thermal expansion. Also, the pressure dependence of the moduli compares well with recent diamond and cell measurements up to 105 GPa. The calculated longitudinal and bulk sound velocities at higher pressure and temperature agree well with data obtained from shock experiments. Additionally, the temperature …
Date: June 21, 2002
Creator: Orlikowski, Daniel A.; Soderlind, Per & Moriarty, John A.
System: The UNT Digital Library
Ffag Accelerator Proton Driver for Neutrino Factory. (open access)

Ffag Accelerator Proton Driver for Neutrino Factory.

This paper is the summary of a conceptual study of a Proton Driver for Neutrino Factory based on the use of a Fixed-Field Alternating-Gradient (FFAG) Accelerator. The required proton energy range for an optimum neutrino production is 5 to 12 GeV. This can be accomplished with a group of three concentric rings each with 807 m circumference [1]. FFAG Accelerators [2] have the capability to accelerate charged particles over a large momentum range ({+-}30-50%) and the feature of constant bending and focusing fields. Particles can be accelerated very fast at the rate given by the accelerating field of RF cavities placed in proper locations between magnets. The performance of FFAG accelerators is to be placed between that of Super-Conducting Linear Accelerators (SCL), with which they share the fast acceleration rate, and Rapid-Cycling Synchrotrons (RCS), as they allow the beam to re-circulate over fewer revolutions. Brookhaven National Laboratory is involved in the study of feasibility of FFAG Accelerators to accelerate intense beams of protons in the GeV energy range for a variety of applications the most important of which is the Upgrade of the Alternating Gradient Synchrotron (AGS) with a new FFAG injector [3] accelerating from 400 MeV to 1.5 GeV. …
Date: June 21, 2005
Creator: Ruggiero, A.
System: The UNT Digital Library