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452 Matching Results
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1400, +/- 900V PEAK PULSE SWITCH MODE POWER SUPPLIES FOR SNS INJECTION KICKERS.
This paper describes simulation and experimental results for a 1400A, {+-} 900V peak rated, switch mode power supply for SNS Injection Kicker Magnets. For each magnet (13 m{Omega}, 160{micro}H), the power supply must supply controlled pulses at 60 Hz repetition rate. The pulse current must rise from zero to maximum in less than 1 millisec in a controlled manner, flat top for up to 2 millisec, and should fall in a controlled manner to less than 4A within 500{micro}s. The low current performance during fall time is the biggest challenge in this power supply. The simulation results show that to meet the controlled fall of the current and the current ripple requirements, voltage loop bandwidth of at least 10 kHz and switching frequency of at least 100 kHz are required. To achieve high power high frequency switching with IGBT switches, a series connected topology with three phase shifted (O{sup o}, 60{sup o} & 120{sup o}) converters each with 40 kHz switching frequency (IGBT at 20kHz), has been achieved. In this paper, the circuit topology, relevant system specifications and experimental results that meet the requirements of the power supply are described in detail. A unique six pulse SCR rectifier circuit with …
Date:
March 10, 2004
Creator:
LAMBIASE,R. ENG,W. SANDBERG,J. DEWAN,S. HOLMES,R. RUST,K. ZENG,J.
Object Type:
Article
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 29, No. 20, Ed. 1 Friday, March 10, 2000
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
March 10, 2000
Creator:
Steele, Janet
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 35, No. 22, Ed. 1 Friday, March 10, 2006
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
March 10, 2006
Creator:
Waltman, Erin
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
2005 Radiation Oncology Gordon Research Conference
This Report is about the Gordon Research Conference on Radiation Oncology Which was held at Crowne Plazza
Date:
March 10, 2006
Creator:
Gray, Elizabeth L. Travis Nancy Ryan
Object Type:
Article
System:
The UNT Digital Library
21st Century Steam for Asteroid Mitigation
The systematic requirements to divert an object on an earth-impacting course are developed relating the minimum velocity perturbation (both magnitude and direction) to the time available before impact. This, coupled with the accuracy to which orbits can be determined, restricts the time available for any mitigation technology to operate. Because nuclear energy densities are nearly a million times higher than those possible with chemical bonds, it is the most mass efficient means for storing delivering energy with today's technology. The question is how to most effectively apply that energy. This paper will examine the simple case of shattering the body, as well as a more controlled approach in which one or more small velocity increments divert a body. The optimal approach depends on the detailed circumstances, but in either case, already developed technology permits a successful diversion with a few years to decades of notice. The success of nuclear options on relatively short timescales permits consideration of other technologies that while not so well developed might be sufficiently improved to divert small (100 meter) bodies.
Date:
March 10, 2004
Creator:
Dearborn, D S
Object Type:
Article
System:
The UNT Digital Library
80th Texas Legislature, Regular Session, House Concurrent Resolution 72
Concurrent resolution introduced by the Texas House of Representatives and Senate relating to in memory of Molly Ivins of Austin.
Date:
March 10, 2007
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
80th Texas Legislature, Regular Session, House Concurrent Resolution 103
Concurrent resolution introduced by the Texas House of Representatives and Senate relating to honoring San Antonio native Aaron Barker for his participation in the Texas Songwriter Showcase.
Date:
March 10, 2007
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
80th Texas Legislature, Regular Session, House Concurrent Resolution 104
Concurrent resolution introduced by the Texas House of Representatives and Senate relating to honoring Lubbock native Richie McDonald for his participation in the Texas Songwriter Showcase.
Date:
March 10, 2007
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
80th Texas Legislature, Regular Session, House Concurrent Resolution 106
Concurrent resolution introduced by the Texas House of Representatives and Senate relating to honoring Paris native Leslie Satcher for her participation in the Texas Songwriter Showcase.
Date:
March 10, 2007
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
80th Texas Legislature, Regular Session, Senate Concurrent Resolution 16
Concurrent resolution introduced by the Texas Senate and House of Representatives commending Roy Velez on being named 2006 Texan of the Year by the Dallas Morning News.
Date:
March 10, 2007
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
80th Texas Legislature, Regular Session, Senate Concurrent Resolution 22
Concurrent resolution introduced by the Texas Senate and House of Representatives congratulating the University of Houston System community and declaring February 20, 2007, University of Houston System Day at the Capitol.
Date:
March 10, 2007
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
81st Texas Legislature, Senate Concurrent Resolutions 36
Concurrent resolution introduced by the Texas Senate and House of Representatives relating to granting the legislature permission to adjourn for more than three days during the period beginning on Wednesday, March 4, 2009, and ending on Monday, March 9, 2009.
Date:
March 10, 2009
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
Adaptive Optics at Lawrence Livermore National Laboratory
Adaptive optics enables high resolution imaging through the atmospheric by correcting for the turbulent air's aberrations to the light waves passing through it. The Lawrence Livermore National Laboratory for a number of years has been at the forefront of applying adaptive optics technology to astronomy on the world's largest astronomical telescopes, in particular at the Keck 10-meter telescope on Mauna Kea, Hawaii. The technology includes the development of high-speed electrically driven deformable mirrors, high-speed low-noise CCD sensors, and real-time wavefront reconstruction and control hardware. Adaptive optics finds applications in many other areas where light beams pass through aberrating media and must be corrected to maintain diffraction-limited performance. We describe systems and results in astronomy, medicine (vision science), and horizontal path imaging, all active programs in our group.
Date:
March 10, 2003
Creator:
Gavel, D T
Object Type:
Article
System:
The UNT Digital Library
Afghanistan: Presidential and Parliamentary Elections
Presidential elections in Afghanistan were held on October 9, 2004, with heavy turnout and minimal violence. Karzai was declared the winner on November 3, 2004 with about 55% of the vote, and he subsequently named a cabinet incorporating most major factions but stressing qualifications. Parliamentary, provincial, and district elections were to be held in April-May 2005, but they are now almost certain to be postponed until at least September 2005. See CRS Report RL30588, Afghanistan: Post-War Governance, Security, and U.S. Policy.
Date:
March 10, 2005
Creator:
Katzman, Kenneth
Object Type:
Report
System:
The UNT Digital Library
Africa Command: U.S. Strategic Interests and the Role of the U.S. Military in Africa
This report provides a broad overview of U.S. strategic interests in Africa and the role of U.S. military efforts on the continent as they pertain to the creation of AFRICOM. Although the command is still in the early stages of its development, a discussion of AFRICOM’s mission, its coordination with other government agencies, and its basing and manpower requirements is included.
Date:
March 10, 2008
Creator:
Ploch, Lauren
Object Type:
Report
System:
The UNT Digital Library
Agricultural Biotechnology: The U.S.-EU Dispute
In May 2003, the United States, Canada, and Argentina initiated a formal challenge before the World Trade Organization (WTO) of the European Union’s (EU’s) de facto moratorium on approving new agricultural biotechnology products, in place since 1998. Although the EU effectively lifted the moratorium in May 2004 by approving a genetically engineered (GE) corn variety, the three countries are pursuing the case, in part because a number of EU member states continue to block approved biotech products. Because of delays, the WTO is expected to decide the case by December 2005. The moratorium reportedly cost U.S. corn growers some $300 million in exports to the EU annually. The EU moratorium, U.S. officials contend, threatened other agricultural exports not only to the EU, but also to other parts of the world where the EU approach to regulating agricultural biotechnology is taking hold.
Date:
March 10, 2006
Creator:
Hanrahan, Charles E.
Object Type:
Report
System:
The UNT Digital Library
Agricultural Export and Food Aid Programs
This report discusses projected agricultural imports and exports for FY2003, as well as legislation that deals with federal programs in support of agricultural exports and federal aid dedicated to farms and agricultural reform.
Date:
March 10, 2003
Creator:
Hanrahan, Charles E.
Object Type:
Report
System:
The UNT Digital Library
Airlift Mini-Bubbler Testing in the Slurry FED Melt Rate Furnace
The objectives of the mini airlift bubbler testing are to evaluate the impact of the bubbler on melt rate, melting behavior and cold cap structure, foam formation and stability, bubbler air venting, off gas behavior, and electrode/plenum power use. In addition, the effects of frit and plenum temperature on bubbler performance were evaluated. This report will cover the second program element, the evaluation of two lengths of mini-bubblers in Slurry Fed Melt Rate Furnaces to assess melting behavior and melt rate enhancement.
Date:
March 10, 2003
Creator:
Witt, D.C.
Object Type:
Report
System:
The UNT Digital Library
The Albany News (Albany, Tex.), Vol. 129, No. 41, Ed. 1 Thursday, March 10, 2005
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
March 10, 2005
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
Altus Times (Altus, Okla.), Vol. 100, No. 304, Ed. 1 Friday, March 10, 2000
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 10, 2000
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 103, No. 319, Ed. 1 Sunday, March 10, 2002
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 10, 2002
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 105, No. 307, Ed. 1 Wednesday, March 10, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 10, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 287, Ed. 1 Thursday, March 10, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 10, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 107, No. 288, Ed. 1 Friday, March 10, 2006
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 10, 2006
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History