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491,873 Matching Results

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Best Match Title Creator Date Created (Newest) Date Created (Oldest) Date Added (Newest) Date Added (Oldest)
Dynamic Resource Management in RSVP- Controlled Unicast Networks (open access)

Dynamic Resource Management in RSVP- Controlled Unicast Networks

Resources are said to be fragmented in the network when they are available in non-contiguous blocks, and calls are dropped as they may not end sufficient resources. Hence, available resources may remain unutilized. In this thesis, the effect of resource fragmentation (RF) on RSVP-controlled networks was studied and new algorithms were proposed to reduce the effect of RF. In order to minimize the effect of RF, resources in the network are dynamically redistributed on different paths to make them available in contiguous blocks. Extra protocol messages are introduced to facilitate resource redistribution in the network. The Dynamic Resource Redistribution (DRR) algorithm when used in conjunction with RSVP, not only increased the number of calls accommodated into the network but also increased the overall resource utilization of the network. Issues such as how many resources need to be redistributed and of which call(s), and how these choices affect the redistribution process were investigated. Further, various simulation experiments were conducted to study the performance of the DRR algorithm on different network topologies with varying traffic characteristics.
Date: December 2001
Creator: Iyengar Prasanna, Venkatesan
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Conceptual design of a large Spectral Shift Controlled Reactor (open access)

Conceptual design of a large Spectral Shift Controlled Reactor

Within the framework of the Nonproliferation Alternative Systems Assessment Program (NASAP), the US Department of Energy (DOE) has sponsored the development of a conceptual design of a large Spectral Shift Controlled Reactor (SSCR). This report describes the results of the development program and assesses the performance of the conceptual SSCR on the basis of fuel resource utilization and total power costs. The point of departure of the design study was a 1270 MW(e) PWR using Combustion Engineering's System 80/sup TM/ reactor and Stone and Webster's Reference Plant Design. The initial phase of the study consisted of establishing an optimal core design for both the once-through uranium cycle and the denatured U-235/thorium cycle with uranium recycle. The performance of the SSCR was then also assessed for the denatured U-233/thorium cycle with uranium recycle and for the plutonium/thorium cycle with plutonium recycle. After the optimal core design was established, the design of the NSSS and balance of plant was developed.
Date: August 1, 1979
Creator: Matzie, R A & Menzel, G P
Object Type: Report
System: The UNT Digital Library
Cue-Controlled Relaxation: Saving Time Versus Efficacy (open access)

Cue-Controlled Relaxation: Saving Time Versus Efficacy

Cue-controlled relaxation is looked at to determine whether a component is efficacious as the entire procedure. Subjects were 40 male and 40 female undergraduates. Subjects were randomly assigned to one of four conditions: cue-controlled relaxation, progressive muscle relaxation, breathing exercises with a paired. cue word, on a presentation of the cue word without being paired. It was hypothesized that cue-controlled relaxation would be superior to a component of cue-controlled relaxation. It was determined that cue-controlled relaxation is not more efficacious than a particular component. Data suggests the majority of anxiety reduction takes place when the treatment focuses on the same modality from which the subject receives the most information about their anxiety. Implications and suggestions for further research are presented.
Date: August 1983
Creator: Todd, John Bruce
Object Type: Thesis or Dissertation
System: The UNT Digital Library
CONTROLLED POLYMERIZATION OF ADSORBED MONOLAYERS. Technical Progress Report. (open access)

CONTROLLED POLYMERIZATION OF ADSORBED MONOLAYERS. Technical Progress Report.

None
Date: January 1, 1966
Creator: Livingston, H.K.
Object Type: Report
System: The UNT Digital Library
Legal Issues Relating to the Disposal of Dispensed Controlled Substances (open access)

Legal Issues Relating to the Disposal of Dispensed Controlled Substances

None
Date: June 23, 2009
Creator: unknown
Object Type: Report
System: The UNT Digital Library
New advances in three-dimensional controlled-sourceelectromagnetic inversion (open access)

New advances in three-dimensional controlled-sourceelectromagnetic inversion

New techniques for improving both the computational andimaging performance of the three dimensional (3D) electromagnetic inverseproblem are presented. A non-linear conjugate gradient algorithm is theframework of the inversion scheme. Full wave equation modelling forcontrolled sources is utilized for data simulation along with anefficient gradient computation approach for the model update. Improvingthe modelling efficiency of the 3D finite difference method involves theseparation of the potentially large modelling mesh, defining the set ofmodel parameters, from the computational finite difference meshes usedfor field simulation. Grid spacings and thus overall grid sizes can bereduced and optimized according to source frequencies and source-receiveroffsets of a given input data set. Further computational efficiency isobtained by combining different levels of parallelization. While theparallel scheme allows for an arbitrarily large number of parallel tasks,the relative amount of message passing is kept constant. Imageenhancement is achieved by model parameter transformation functions,which enforce bounded conductivity parameters and thus prevent parameterovershoots. Further, a remedy for treating distorted data within theinversion process is presented. Data distortions simulated here includepositioning errors and a highly conductive overburden, hiding the desiredtarget signal. The methods are demonstrated using both synthetic andfield data.
Date: May 19, 2007
Creator: Commer, Michael & Newman, Gregory A.
Object Type: Article
System: The UNT Digital Library
Annual report for 1974 on controlled thermonuclear reactor technology (open access)

Annual report for 1974 on controlled thermonuclear reactor technology

None
Date: February 1, 1975
Creator: unknown
Object Type: Report
System: The UNT Digital Library
Controlled-source audiomagnetotellurics in geothermal exploration. Topical report (open access)

Controlled-source audiomagnetotellurics in geothermal exploration. Topical report

Theoretical and field tests indicate that the controlled-source audiomagnetotelluric (CSAMT) method provides an efficient means of delineating the shallow resistivity pattern above a hydrothermal system. Utilizing a transmitter overcomes the main limitation of conventional AMT: variable and unreliable natural source fields. Reliable CSAMT measurements can be made with a simple scalar receiver. Calculations for a half-space show that the plane wave assumption is valid when the transmitter is more than 3 skin depths away in the broadside configuration and more than 5 skin depths away in the collinear configuration. Three dimensional numerical modeling results for a bipole source 5 skin depths away compare well with those for a plane wave source, showing that the method is valid. Comparisons between 2D and 3D model results show that a 2D MT program can be used to interpret CSAMT data. A CMAST survey at the Roosevelt Hot Springs KGRA produced apparent resistivity contour maps at four frequecies: 32, 98, 977, and 5208 Hz. These maps show the same features as a first-separation dipole-dipole resistivity map. Detailed CSAMT data was also collected at 10 frequencies on two profiles. Two-dimensional MT modeling (TM mode) of the resulting pseudosections yields models similar to those derived by …
Date: September 1, 1980
Creator: Sandberg, S. K. & Hohmann, G. W.
Object Type: Report
System: The UNT Digital Library
Conceptual design of a large Spectral Shift Controlled Reactor (open access)

Conceptual design of a large Spectral Shift Controlled Reactor

Within the framework of the Nonproliferation Alternative Systems Assessment Program (NASAP), the US Department of Energy (DOE) has sponsored the development of a conceptual design of a large Spectral Shift Controlled Reactor (SSCR). The results are presented of the development program, and the performance of the conceptual SSCR is assessed on the basis of fuel resource utilization and total power costs. The point of departure of the design study was a 1270 MW(e) PWR using Combustion Engineering's System 80 reactor and Stone and Webster's Reference Plant Design. The initial phase of the study consisted of establishing an optimal core design for both the once-through uranium cycle and the denatured U-235/thorium cycle with uranium recycle. The performance of the SSCR was then also assessed for the denatured U-233/thorium cycle with uranium recycle and for the plutonium/thorium cycle with plutonium recycle. After the optimal core design was established, the design of the NSSS and balance of plant was developed.
Date: August 1, 1979
Creator: Matzie, R A & Menzel, G P
Object Type: Report
System: The UNT Digital Library
Molecular Aspects of Transport in Thin Films of Controlled Architecture (open access)

Molecular Aspects of Transport in Thin Films of Controlled Architecture

Our laboratory focuses on developing spatially localized chemistries which can produce structures of controlled architecture on the supermolecular length scale -- structures which allow us to control the motion of molecular species with high spatial resolution, ultimately on nanometer length scales. Specifically, nanocapillary array membranes (NCAMs) contain an array of nanometer diameter pores connecting vertically separated microfluidic channels. NCAMs can manipulate samples with sub-femtoliter characteristic volumes and attomole sample amounts and are opening the field of chemical analysis of mass-limited samples, because they are capable of digital control of fluid switching down to sub-attoliter volumes; extension of analytical “unit operations” down to sub-femtomole sample sizes; and exerting spatiotemporal control over fluid mixing to enable studies of reaction dynamics. Digital flow switching mediated by nanocapillary array membranes can be controlled by bias, ionic strength, or pore diameter and is being studied by observing the temporal characteristics of transport across a single nanopore in thin PMMA membranes. The control of flow via nanopore surface characteristics, charge density and functional group presentation, is being studied by coupled conductivity and laser-induced fluorescence (LIF) measurements. Reactive mixing experiments previously established low millisecond mixing times for NCAM-mediated fluid transfer, and this has been exploited to demonstrate …
Date: April 16, 2009
Creator: Bohn, Paul W.
Object Type: Report
System: The UNT Digital Library
REVIEW OF CONTROLLED THERMONUCLEAR RESEARCH AT LOS ALAMOS, 1965 (open access)

REVIEW OF CONTROLLED THERMONUCLEAR RESEARCH AT LOS ALAMOS, 1965

None
Date: April 1, 1965
Creator: unknown
Object Type: Report
System: The UNT Digital Library
Design and evaluation of a microcomputer-controlled remote pipetter system (open access)

Design and evaluation of a microcomputer-controlled remote pipetter system

A remote pipetter has been designed and evaluated. The system is suitable for use in either a hot-cell or a glove-box environment and, therefore, is applicable in any situation where operating personnel must be separated from hazardous materials. The principle of operation for the pipetter is the displacement of liquid via a calibrated, screw-driven plunger. Variably sized aliquots of 1 to 1000 ..mu..L can be delivered. A steppng motor is used to move the plunger, and its position is verified with a linear variable differential transformer. The unit is controlled by a microcomputer. Besides the required operation sequences and error checking, a self-calibration check has been designed into the software. Measured accuracies and precisions of aliquot delivery are 0.4 and 0.2%, respectively.
Date: January 1, 1981
Creator: Goeringer, D. E. & Klatt, L. N.
Object Type: Article
System: The UNT Digital Library
Controlled-air incineration of alpha-bearing solid wastes (open access)

Controlled-air incineration of alpha-bearing solid wastes

The Los Alamos Scientific Laboratory is completing a study of controlled-air incineration (CAI) as a technique for volume reduction and stabilization of combustible transuranic-contaminated solid wastes. To demonstrate feasibility, a process has been assembled and operated on synthetic and contaminated combustibles. This paper summarizes the CAI project history, process design, provisions for radioactive operation, experimental results to date, and future plans. Achievements include operation at the design feed rate as well as combustion of separate feed compositions including cellulosics, polyethylene, polyvinyl chloride (PVC) and latex rubber. Refractory life has been satisfactory to date, with studies continuing. The offgas cleanup system has proven to be extremely effective; the final high-efficiency filters showing virtually no pressure drop increase. The ability of the system to process high concentrations of PVC has been demonstrated with no chloride-induced degradation detected. Chloride and sulfate removal from the offgas has been excellent with concentrations reaching 8 and 10 ppM maximum, respectively, in the process condensate.
Date: January 1, 1980
Creator: Koenig, R. A.; Draper, W. E.; Neuls, A. S. & Newmyer, J. M.
Object Type: Article
System: The UNT Digital Library
Controlled Velocity Testing of an 8-kW Wind Turbine (open access)

Controlled Velocity Testing of an 8-kW Wind Turbine

This paper describes a case study of the controlled-velocity test of an 8-kW wind turbine. The turbine was developed in response to the U.S. Department of Energy's small wind turbine program. As background, the prototype development is discussed. The turbine mechanical and electrical components are described. The turbine was tested on a flatbed truck and driven down an airfield runway at constant relative wind speed. Horizontal furling was used to control over-speed. Various parameters were changed to determine their effects on furling. The testing showed that the machine had insufficient rotor offset for adequate furling. Also, a rotor resonance problem was discovered and remedied. Problems associated with taking the measurements made it difficult to determine if the truck test was a suitable method for code validation. However, qualitative observations gleaned from the testing justified the effort.
Date: July 31, 2001
Creator: Larwood, S.; Sencenbaugh, J. & Acker, B.
Object Type: Article
System: The UNT Digital Library
Controlled Hydrogen Fleet and Infrastructure Demonstration and Validation Project (open access)

Controlled Hydrogen Fleet and Infrastructure Demonstration and Validation Project

General Motors, LLC and energy partner Shell Hydrogen, LLC, deployed a system of hydrogen fuel cell electric vehicles integrated with a hydrogen fueling station infrastructure to operate under real world conditions as part of the U.S. Department of Energy's Controlled Hydrogen Fleet and Infrastructure Validation and Demonstration Project. This technical report documents the performance and describes the learnings from progressive generations of vehicle fuel cell system technology and multiple approaches to hydrogen generation and delivery for vehicle fueling.
Date: February 8, 2012
Creator: Stottler, Gary
Object Type: Report
System: The UNT Digital Library
CONTROLLED POLYMERIZATION OF ADSORBED MONOMERS. Technical Progress Report. (open access)

CONTROLLED POLYMERIZATION OF ADSORBED MONOMERS. Technical Progress Report.

None
Date: January 1, 1967
Creator: Livingston, H.K.
Object Type: Report
System: The UNT Digital Library
AEC Policy and Action Paper on Controlled Thermonuclear Research (open access)

AEC Policy and Action Paper on Controlled Thermonuclear Research

None
Date: June 1, 1966
Creator: unknown
Object Type: Report
System: The UNT Digital Library
Accidental Dispersion of Reactor Poisons and the Controlled Distance Required (open access)

Accidental Dispersion of Reactor Poisons and the Controlled Distance Required

Two types of hypothetical reactor catastrophe are considered. In the first of these, the Boiling Accident,'' it is assumed that a fraction of the radioactive material in a reactor is released to the atmosphere at a steady rate over a period of hours. In the second, the Puff Accident,'' it is assumed that the release of the radioactive material takes place instantaneously.'' The following concepts are used as measures of the hazard existing outside the controlled plant area. Danger Distance,'' defined as that distance beyond which the fission product cloud becomes so dilute that it cannot cause death; Probabiiity of Death per Capita per Accident,'' which is a measure of the hazard to any individual; and Expectation Number of Deaths per Accident.'' which is a statistical measure of the hazard to the entire off-site populace. Three mechanisms for each type of catastrophe were considered: direct irradiation from the fission product cloud, inhalation of the air in the cloud, and rainout from the cloud followed by irradiation from the ground. Failout is not considered. for it requires that a very energetic explosion be assumed. It is concluded that the size of the plant should be set by the hazard of irradiation …
Date: March 1, 1958
Creator: Menegus, R. L. & Ring, H. F.
Object Type: Report
System: The UNT Digital Library
Meso-scale controlled motion for a microfluidic drop ejector. (open access)

Meso-scale controlled motion for a microfluidic drop ejector.

The objective of this LDRD was to develop a uniquely capable, novel droplet solution based manufacturing system built around a new MEMS drop ejector. The development all the working subsystems required was completed, leaving the integration of these subsystems into a working prototype still left to accomplish. This LDRD report will focus on the three main subsystems: (1) MEMS drop ejector--the MEMS ''sideshooter'' effectively ejected 0.25 pl drops at 10 m/s, (2) packaging--a compact ejector package based on a modified EMDIP (Electro-Microfluidic Dual In-line Package--SAND2002-1941) was fabricated, and (3) a vision/stage system allowing precise ejector package positioning in 3 dimensions above a target was developed.
Date: December 1, 2004
Creator: Galambos, Paul C.; Givler, Richard C.; Pohl, Kenneth Roy; Czaplewski, David A.; Luck, David L.; Braithwaite, Mark J. et al.
Object Type: Report
System: The UNT Digital Library
Increasing the Volumetric Efficiency of Diesel Engines by Intake Pipes (open access)

Increasing the Volumetric Efficiency of Diesel Engines by Intake Pipes

"Development of a method for calculating the volumetric efficiency of piston engines with intake pipes. Application of this method to the scavenging pumps of two-stroke-cycle engines with crankcase scavenging and to four-stroke-cycle engines. The utility of the method is demonstrated by volumetric-efficiency tests of the two-stroke-cycle engines with crankcase scavenging. Its practical application to the calculation of intake pipes is illustrated by example" (p. 1).
Date: March 1933
Creator: List, Hans
Object Type: Report
System: The UNT Digital Library
Supplemental Insert Sheets for Engineering Materials List. (open access)

Supplemental Insert Sheets for Engineering Materials List.

None
Date: January 1, 1967
Creator: Kelly, R. C.
Object Type: Report
System: The UNT Digital Library
Acronym master list (open access)

Acronym master list

This document is a master list of acronyms and other abbreviations that are used by or could be useful to, the personnel at Los Alamos National Laboratory. Many specialized and well-known abbreviations are not included in this list.
Date: June 1, 1995
Creator: unknown
Object Type: Report
System: The UNT Digital Library
Agriculture: A List of Websites (open access)

Agriculture: A List of Websites

This list provides a sampling of the rapidly proliferating number of agricultural resources available on the Internet. It is not intended to be exhaustive. It is divided into 27 categories.
Date: January 18, 2000
Creator: Canada, Carol
Object Type: Report
System: The UNT Digital Library
Agriculture: A List of Websites (open access)

Agriculture: A List of Websites

This list provides a sampling of the rapidly proliferating number of agricultural resources available on the Internet. It is not intended to be exhaustive. It is divided into 24 main categories and 15 subcategories.
Date: February 8, 2001
Creator: Canada, Carol
Object Type: Report
System: The UNT Digital Library