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1,169 Matching Results
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Distributive Distillation Enabled by Microchannel Process Technology
The application of microchannel technology for distributive distillation was studied to achieve the Grand Challenge goals of 25% energy savings and 10% return on investment. In Task 1, a detailed study was conducted and two distillation systems were identified that would meet the Grand Challenge goals if the microchannel distillation technology was used. Material and heat balance calculations were performed to develop process flow sheet designs for the two distillation systems in Task 2. The process designs were focused on two methods of integrating the microchannel technology â 1) Integrating microchannel distillation to an existing conventional column, 2) Microchannel distillation for new plants. A design concept for a modular microchannel distillation unit was developed in Task 3. In Task 4, Ultrasonic Additive Machining (UAM) was evaluated as a manufacturing method for microchannel distillation units. However, it was found that a significant development work would be required to develop process parameters to use UAM for commercial distillation manufacturing. Two alternate manufacturing methods were explored. Both manufacturing approaches were experimentally tested to confirm their validity. The conceptual design of the microchannel distillation unit (Task 3) was combined with the manufacturing methods developed in Task 4 and flowsheet designs in Task 2 to …
Date:
January 22, 2013
Creator:
Arora, Ravi
Object Type:
Report
System:
The UNT Digital Library
Detector Noise Susceptibility Issues for the Future Generation of High Energy Physics Experiments
The front-end electronics (FEE) noise characterization to electromagnetic interference and the compatibility of the different subsystems are important topics to consider for the LHC calorimeter upgrades. A new power distribution scheme based on switching power converters is under study and will define a noticeable noise source very close to the detector's FEE. Knowledge and experience with both FFE noise and electromagnetic compatibility (EMC) issues from previous detectors are important conditions to guarantee the design goals and the good functionality of the upgraded LHC detectors. This paper shows an overview of the noise susceptibility studies performed in different CMS subdetectors. The impact of different FEE topologies in the final sensitivity to electromagnetic interference of the subsystem is analyzed and design recommendations are presented to increase the EMC of the detectors to the future challenging power distribution topologies.
Date:
November 22, 2011
Creator:
Arteche, F.; Esteban, C.; Iglesias, M.; Rivetta, C. & Arcega, F. J.
Object Type:
Article
System:
The UNT Digital Library
Correlated Leading Baryon-antibaryon Production in e+e- to ccbar to Lambda_c+ antiLambda_c- X
We present a study of 649 {+-} 35 e{sup +}e{sup -} {yields} c{bar c} events produced at {radical}s {approx} 10.6 GeV containing both a {Lambda}{sub c}{sup +} baryon and a {bar {Lambda}}{sub c}{sup -} antibaryon. The number observed is roughly four times that expected if the leading charmed hadron types are uncorrelated, confirming an observation by the CLEO Collaboration. We find a 2-jet topology in these events but very few additional baryons, demonstrating that the primary c and {bar c} are predominantly contained in a correlated baryon-antibaryon system. In addition to the charmed baryons we observe on average 2.6 {+-} 0.2 charged intermediate mesons, predominantly pions, carrying 65% of the remaining energy.
Date:
August 22, 2011
Creator:
Aubert, B.; Karyotakis, Y.; Lees, J. P.; Poireau, V.; Prencipe, E.; Prudent, X. et al.
Object Type:
Article
System:
The UNT Digital Library
Domestic Food Assistance: Summary of Programs
This report discusses food assistance programs which are administered by the U.S. Department of Agriculture's Food and Nutrition Service (USDA-FNS) programs as well as nutrition programs administered by the Administration on Aging (AOA), within the U.S. Department of Health and Human Services' Administration for Community Living (HHS-ACL).
Date:
March 22, 2018
Creator:
Aussenberg, Randy Alison & Colello, Kirsten J.
Object Type:
Report
System:
The UNT Digital Library
Overview of the Federal Debt
The size of current and projected federal deficits and the accumulation of federal debt are central to current congressional deliberations regarding fiscal reforms. This report provides a broad overview of the federal debt, annual budget deficits, and debt service costs. Federal debt is the accumulated sum of unrepaid borrowing by the federal government over time. The total federal debt consists of debt held by the public and intragovernmental debt. Debt owed to the public represents borrowing from entities other than the federal government, and includes borrowing from state and local governments, foreign governments and investors, the Federal Reserve System, and foreign central banks, as well as private investors in the United States.
Date:
May 22, 2011
Creator:
Austin, D. Andrew
Object Type:
Report
System:
The UNT Digital Library
The Debt Limit: History and Recent Increases
This report discusses how the total debt of the federal government can increase, an historical overview of debt limits, and how the current economic slowdown has led to higher deficits and thereby a series of debt limit increases, as well as legislation related to these increases.
Date:
May 22, 2013
Creator:
Austin, D. Andrew & Levit, Mindy R.
Object Type:
Report
System:
The UNT Digital Library
The Debt Limit: History and Recent Increases
This report gives an overview of the federal debt limit, its history, and recent increases
Date:
May 22, 2012
Creator:
Austin, D. Andrew & Levit, Mindy R.
Object Type:
Report
System:
The UNT Digital Library
Trends in Discretionary Spending
This report discusses historical, current, and projected discretionary spending trends. It also describes how current discretionary spending trends reflect national priorities. Discretionary spending is provided in, and controlled by, annual appropriations acts, which fund many of the routine activities commonly associated with such federal government functions as running executive branch agencies, congressional offices and agencies, and international operations of the government.
Date:
February 22, 2010
Creator:
Austin, D. Andrew & Levit, Mindy R.
Object Type:
Report
System:
The UNT Digital Library
Image Processing And Control Of A Programmable Spatial Light Modulator For Spatial Beam Shaping
None
Date:
January 22, 2013
Creator:
Awwal, A. S.; Orth, C.; Tse, E.; Matone, J.; Paul, M.; Hardy, C. et al.
Object Type:
Article
System:
The UNT Digital Library
Design and implementation of Dilation X-ray Imager for National Ignition Facility "DIXI"
None
Date:
August 22, 2013
Creator:
Ayers, M. J.; Bell, P. M.; Bradley, D.; Chung, M.; Felker, B.; Hares, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Up Sector of Minimal Flavor Violation: Top-Quark Properties and Direct D Meson CP Violation
None
Date:
August 22, 2013
Creator:
Bai, Yang; /Wisconcin U., Madison; Berger, Joshua; Hewett, JoAnne L.; Li, Ye & /SLAC
Object Type:
Article
System:
The UNT Digital Library
Defense Surplus Equipment Disposal: Background Information
This report discusses the Department of Defense (DOD) policy via the Defense Utilization and Marketing Service (DRMS) for disposing of government equipment and supplies considered surplus or deemed unnecessary to the agency's currently designated mission. The report focuses on DRMS background, as well as the most recent DRMS policy modifications.
Date:
August 22, 2013
Creator:
Bailey Grasso, Valerie
Object Type:
Report
System:
The UNT Digital Library
A Piecewise Bi-Linear Discontinuous Finite Element Spatial Discretization of the Sn Transport Equation
We present a new spatial discretization of the discrete-ordinates transport equation in two-dimensional Cartesian (X-Y) geometry for arbitrary polygonal meshes. The discretization is a discontinuous finite element method (DFEM) that utilizes piecewise bi-linear (PWBL) basis functions, which are formally introduced in this paper. We also present a series of numerical results on quadrilateral and polygonal grids and compare these results to a variety of other spatial discretizations that have been shown to be successful on these grid types. Finally, we note that the properties of the PWBL basis functions are such that the leading-order piecewise bi-linear discontinuous finite element (PWBLD) solution will satisfy a reasonably accurate diffusion discretization in the thick diffusion limit, making the PWBLD method a viable candidate for many different classes of transport problems.
Date:
December 22, 2010
Creator:
Bailey, T S; Chang, J H; Warsa, J S & Adams, M L
Object Type:
Article
System:
The UNT Digital Library
A Posteriori Error Estimation via Nonlinear Error Transport
None
Date:
June 22, 2012
Creator:
Banks, J W; Hittinger, J F; Connors, J M & Woodward, C S
Object Type:
Article
System:
The UNT Digital Library
Olmstead v. L.C.: Judicial and Legislative Developments in the Law of Deinstitutionalization
None
Date:
November 22, 2011
Creator:
Barbour, Emily C.
Object Type:
Report
System:
The UNT Digital Library
Trade Promotion Authority and the Korea Free Trade Agreement
This report looks at the effects of the Korean Free Trade Agreement (KORUS FTA) on side agreements via the North American Free Trade Agreement (NAFTA).
Date:
December 22, 2010
Creator:
Barbour, Emily C.
Object Type:
Report
System:
The UNT Digital Library
Cascade Reverse Osmosis Air Conditioning System
Advanced Research Projects Agency-Energy project sheet summarizing general information about the Building Energy Efficiency Through Innovative Thermodevices (BEETIT) program including critical needs, innovation and advantages, impacts, and contact information. This sheet discusses air conditioning that has increased electrical efficiency as part of the "Cascade Reverse Osmosis and the Absorption Osmosis Cycle" project.
Date:
February 22, 2012
Creator:
Batelle Memorial Institute
Object Type:
Text
System:
The UNT Digital Library
Precise Measurement of the K - to Pi -E E- Decay
A sample of 7253 K{sup {+-}} {yields} {pi}{sup {+-}}e{sup +}e{sup -}({gamma}) decay candidates with 1.0% background contamination has been collected by the NA 48/2 experiment at the CERN SPS, which allowed a precise measurement of the decay properties. The branching ratio in the full kinematic range was measured to be BR = (3.11 {+-} 0.12) x 10{sup -7}, where the uncertainty includes also the model dependence. The shape of the form factor W(z), where z = (M{sub ee}/M{sub K}){sup 2}, was parameterized according to several models, and, in particular, the slope {delta} of the linear form factor W(z) = W{sub 0}(1 + {delta}z) was determined to be {delta} = 2.32 {+-} 0.18. A possible CP violating asymmetry of K{sup +} and K{sup -} decay widths was investigated, and a conservative upper limit of 2.1 x 10{sup -2} at 90% CL was established.
Date:
November 22, 2011
Creator:
Batley, J. R.; Culling, A. J.; Kalmus, G.; Lazzeroni, C.; Munday, D. J.; Slater, M. W. et al.
Object Type:
Article
System:
The UNT Digital Library
Identifying the Proteins that Mediate the Ionizing Radiation Resistance of Deinococcus Radiodurans R1
The primary objectives of this proposal was to define the subset of proteins required for the ionizing radiation (IR) resistance of Deinococcus radiodurans R1, characterize the activities of those proteins, and apply what was learned to problems of interest to the Department of Energy.
Date:
February 22, 2010
Creator:
Battista, John R
Object Type:
Report
System:
The UNT Digital Library
Impeachment: An Overview of Constitutional Provisions, Procedure, and Practice
This report focuses on the American impeachment process, which places in the legislative branch the authority to remove the President, Vice President, and other federal civil officers in the executive and judicial branches upon a determination that such officers have engaged in treason, bribery, or other high crimes and misdemeanors. This report summarizes impeachment proceedings in the 111th Congress, examines relevant constitutional provisions, and provides a brief historical overview.
Date:
November 22, 2010
Creator:
Bazan, Elizabeth B.
Object Type:
Report
System:
The UNT Digital Library
Meat and Poultry Inspection: Background and Selected Issues
This report provides an overview of the background and selected issues of the meat and poultry inspection.
Date:
March 22, 2010
Creator:
Becker, Geoffrey S.
Object Type:
Report
System:
The UNT Digital Library
Simulation of Dimensional Changes and Hot Tears During Solidification of Steel Castings
During solidification, contractions or distortions of the steel, known as ÃÂâÃÂÃÂÃÂÃÂdimensional changes,ÃÂâÃÂÃÂÃÂàcan cause the final product to vary significantly from the original pattern. Cracks in the casting that form during the late stages of solidification, called ÃÂâÃÂÃÂÃÂÃÂhot tears,ÃÂâÃÂÃÂÃÂàoccur when contractions can no longer be accommodated by residual liquid metal flow or solid metal displacement. Dimensional changes and hot tears are major problems in the steel casting industry. These occurrences are difficult to anticipate and correct using traditional foundry engineering methods. While dimensional changes are accommodated using pattern allowances, the desired dimensions are often inaccurate. Castings that form hot tears must then be scrapped or weld repaired, expending unnecessary energy. Correcting either of these problems requires a tedious trial-and-error process that may not necessarily yield accurate results. A model that predicts hot tears and dimensional changes during steel casting solidification has been successfully developed and implemented in commercial casting and stress analysis software. This model is based on a visco-plastic constitutive model with damage, where the damage begins to form when liquid feed metal is cut off to a solidifying region. The hot tear prediction is a locater for hot tear initiation sites, and not a full tear prediction: …
Date:
July 22, 2011
Creator:
Beckermann, Christoph & Carlson, Kent
Object Type:
Report
System:
The UNT Digital Library
Simulation of Distortion and Residual Stress Development During Heat Treatment of Steel Castings
Heat treatment and associated processing, such as quenching, are critical during high strength steel casting production. These processes must be managed closely to prevent thermal and residual stresses that may result in distortion, cracking (particularly after machining), re-work, and weld repair. The risk of casting distortion limits aggressive quenching that can be beneficial to the process and yield an improved outcome. As a result of these distortions, adjustments must be made to the casting or pattern design, or tie bars must be added. Straightening castings after heat treatments can be both time-consuming and expensive. Residual stresses may reduce a castingÃÂâÃÂÃÂÃÂÃÂs overall service performance, possibly resulting in catastrophic failure. Stress relieving may help, but expends additional energy in the process. Casting software is very limited in predicting distortions during heat treatment, so corrective measures most often involve a tedious trial-and-error procedure. An extensive review of existing heat treatment residual stress and distortion modeling revealed that it is vital to predict the phase transformations and microstructure of the steel along with the thermal stress development during heat treatment. After reviewing the state-of-the-art in heat treatment residual stress and distortion modeling, an existing commercial code was selected because of its advanced capabilities in …
Date:
July 22, 2011
Creator:
Beckermann, Christoph & Carlson, Kent
Object Type:
Report
System:
The UNT Digital Library
Facts About XLDB-2011
This note provides details of the 5th Extremely Large Databases Conference and Invitational Workshop that were held in 2011 on 18-19 October and 20 October, respectively, at the SLAC National Accelerator Laboratory in Menlo Park, California. The main goals of the conference were: (1) Encourage and accelerate the exchange of ideas between users trying to build extremely large databases worldwide and database solution providers; (2) Share lessons, trends, innovations, and challenges related to building extremely large databases; (3) Facilitate the development and growth of practical technologies for extremely large databases; and (4) Strengthen, expand, and engage the XLDB community.
Date:
February 22, 2012
Creator:
Becla, Jacek; Lim, Kian-Tat & Wang, Daniel L.
Object Type:
Article
System:
The UNT Digital Library