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Rise Time Measurement for Ultrafast X-Ray Pulses
A pump-probe scheme measures the rise time of ultrafast x-ray pulses. Conventional high speed x-ray diagnostics (x-ray streak cameras, PIN diodes, diamond PCD devices) do not provide sufficient time resolution to resolve rise times of x-ray pulses on the order of 50 fs or less as they are being produced by modern fast x-ray sources. Here, we are describing a pump-probe technique that can be employed to measure events where detector resolution is insufficient to resolve the event. The scheme utilizes a diamond plate as an x-ray transducer and a p-polarized probe beam.
Date:
April 5, 2005
Creator:
Celliers, Peter M.; Weber, Franz A. & Moon, Stephen J.
System:
The UNT Digital Library
Molecular Modeling and Simulation of Aqueous Electrolyte Systems
None
Date:
April 5, 2011
Creator:
Cummings, Peter
System:
The UNT Digital Library
Improved collecting apparatus
An improved collecting apparatus for small aquatic or airborne organisms such as plankton, larval fish, insects, etc. The improvement constitutes an apertured removal container within which is retained a collecting bag, and which is secured at the apex of a conical collecting net. Such collectors are towed behind a vessel or vehicle with the open end of the conical net facing forward for trapping the aquatic or airborne organisms within the collecting bag, while allowing the water or air to pass through the apertures in the container. The container is readily removable from the collecting net whereby the collecting bag can be quickly removed and replaced for further sample collection. The collecting bag is provided with means for preventing the bag from being pulled into the container by the water or air following therethrough.
Date:
March 5, 1981
Creator:
Duncan, C.P.
System:
The UNT Digital Library
Long-Term Colloid Mobilization And Colloid-Facilitated Transport Of Radionuclides In A Semi-Arid Vadose Zone
The main purpose of this project was to improve the fundamental mechanistic understanding and quantification of long-term colloid mobilization and colloid-facilitated transport of radionuclides in the vadose zone, with special emphasis on the semi-arid Hanford site. While we focused some of the experiments on hydrogeological and geochemical conditions of the Hanford site, many of our results apply to colloid and colloid-facilitated transport in general. Specific objectives were (1) to determine the mechanisms of colloid mobilization and colloid-facilitated radionuclide transport in undisturbed Hanford sediments under unsaturated flow, (2) to quantify in situ colloid mobilization and colloid-facilitated radionuclide transport from Hanford sediments under field conditions, and (3) to develop a field-scale conceptual and numerical model for colloid mobilization and transport at the Hanford vadose zone, and use that model to predict long-term colloid and colloid- facilitated radionuclide transport. To achieve these goals and objectives, we have used a combination of experimental, theoretical, and numerical methods at different spatial scales, ranging from microscopic investigations of single particle attachment and detachment to larger-scale field experiments using outdoor lysimeters at the Hanford site. Microscopic and single particle investigations provided fundamental insight into mechanisms of colloid interactions with the air-water interface. We could show that a …
Date:
November 5, 2012
Creator:
Flury, Markus; Harsh, James B; Zhang, Fred; Gee, Glendon W; Mattson, Earl D & Lichtner, Peter C
System:
The UNT Digital Library
Fundamental Investigations of Nanoscale Phenomena in Beam-Assisted Nucleation, Growth and Surface Smoothing, Using in situ LEEM
The purposes for which this grant was provided were specifically (1) to construct a tandem instrument that combined a low energy electron microscope (LEEM) with an ion beam source capably of irradiating a sample during observation of the surface using LEEM; and (2) to employ the new machine to whatever degree possible to observe the evolution of clean crystal surfaces during ion beam irradiation. A principal motivation was to investigate the fundamental behavior of radiation damage under circumstances for which the damage can be observed directly in real time as it occurs. A second main motivation was to create tunable perturbations of the defect (adatom and advacancy) equilibrium on clean crystal planes and in this way explore the fundamental kinetics of surface behavior that enters into numerous phenomena of interest to DOE including surface erosion, catalysis, and the damage to crystals caused by impacts of energetic particles. The funding has been employed to successfully pursue all the original goals, and additional opportunities that developed as a result of discoveries made in this research.
Date:
November 5, 2008
Creator:
Flynn, Colin P.
System:
The UNT Digital Library
A Study of Mechanisms of Hydrogen Diffusion in Separation Devices
None
Date:
April 5, 1980
Creator:
Lee, M. H.
System:
The UNT Digital Library
Quarterly Report to the Technology Assessment Board, October 1 - December 31, 1979
Quarterly report to the Technology Assessment Board, detailing progress and budgets at OTA.
Date:
February 5, 1980
Creator:
Office of Technology Assessment
System:
The UNT Digital Library
Characterizing the Vertical Distribution of Aerosols Over the ARM SGP Site
This project focused on: 1) evaluating the performance of the DOE ARM SGP Raman lidar system in measuring profiles of water vapor and aerosols, and 2) the use of the Raman lidar measurements of aerosol and water vapor profiles for assessing the vertical distribution of aerosols and water vapor simulated by global transport models and examining diurnal variability of aerosols and water vapor. The highest aerosol extinction was generally observed close to the surface during the nighttime just prior to sunrise. The high values of aerosol extinction are most likely associated with increased scattering by hygroscopic aerosols, since the corresponding average relative humidity values were above 70%. After sunrise, relative humidity and aerosol extinction below 500 m decreased with the growth in the daytime convective boundary layer. The largest aerosol extinction for altitudes above 1 km occurred during the early afternoon most likely as a result of the increase in relative humidity. The water vapor mixing ratio profiles generally showed smaller variations with altitude between day and night. We also compared simultaneous measurements of relative humidity, aerosol extinction, and aerosol optical thickness derived from the ARM SGP Raman lidar and in situ instruments on board a small aircraft flown routinely …
Date:
May 5, 2009
Creator:
Richard Ferrare, Connor Flynn, David Turner
System:
The UNT Digital Library
Texas Attorney General Opinion: C-16
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Waggoner Carr, regarding a legal question submitted for clarification: Constitutionality of House Bill 249 of the 58th Legislature.
Date:
February 5, 1963
Creator:
Texas. Attorney-General's Office.
System:
The Portal to Texas History
Texas Attorney General Opinion: C-22
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Waggoner Carr, regarding a legal question submitted for clarification: Reconsideration of Attorney General's Opinions WW-1337 and WW-1337-A
Date:
March 5, 1963
Creator:
Texas. Attorney-General's Office.
System:
The Portal to Texas History
Texas Attorney General Opinion: C-24
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Waggoner Carr, regarding a legal question submitted for clarification: Sale, at public sale, of real estate purchased by a taxing unit at delinquent ad valorem tax foreclosure sale for less than its adjudged value without consent of the other taxing units for whom it also holds title.
Date:
March 5, 1963
Creator:
Texas. Attorney-General's Office.
System:
The Portal to Texas History
Texas Attorney General Opinion: C-25
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Waggoner Carr, regarding a legal question submitted for clarification: Construction of Section 56 of Article XVI of the Constitution of Texas.
Date:
March 5, 1963
Creator:
Texas. Attorney-General's Office.
System:
The Portal to Texas History
Texas Attorney General Opinion: C-26
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Waggoner Carr, regarding a legal question submitted for clarification: Whether counties may legally expend Permanent Improvement Funds under the provisions of Article 1109k, V.C.S., for the five named purposes.
Date:
March 5, 1963
Creator:
Texas. Attorney-General's Office.
System:
The Portal to Texas History
Texas Attorney General Opinion: C-89
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Waggoner Carr, regarding a legal question submitted for clarification: Opinion No. WW-1506 Subject: Marble Machines
Date:
June 5, 1963
Creator:
Texas. Attorney-General's Office.
System:
The Portal to Texas History
Texas Attorney General Opinion: C-139
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Waggoner Carr, regarding a legal question submitted for clarification: Authority of Highway Commission to refuse permits to place gas pipelines on highway right of ways.
Date:
September 5, 1963
Creator:
Texas. Attorney-General's Office.
System:
The Portal to Texas History
Texas Attorney General Opinion: C-171
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Waggoner Carr, regarding a legal question submitted for clarification: Constitutionality and construction of Article 41a, Sec. 4(a), V.C.S. (Public Accountancy Act).
Date:
November 5, 1963
Creator:
Texas. Attorney-General's Office.
System:
The Portal to Texas History
Texas Attorney General Opinion: C-192
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Waggoner Carr, regarding a legal question submitted for clarification: Whether Chapters 7 and 8, Title 122A, Taxation General, permit sales of unstamped cigarettes and untaxed cigars and tobacco products under the stated circumstances.
Date:
December 5, 1963
Creator:
Texas. Attorney-General's Office.
System:
The Portal to Texas History
Texas Attorney General Opinion: C-214
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Waggoner Carr, regarding a legal question submitted for clarification: Penalty for violating Section 5, Art. 734a, V.P.C. (Texas Barber Law)
Date:
February 5, 1964
Creator:
Texas. Attorney-General's Office.
System:
The Portal to Texas History
Texas Attorney General Opinion: C-254
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Waggoner Carr, regarding a legal question submitted for clarification: Whether a person can be charged with operating a motor vehicle while his license was under suspension, when he has plead guilty and paid a fine for operating a motor vehicle without a driver’s license involving the same transaction.
Date:
May 5, 1964
Creator:
Texas. Attorney-General's Office.
System:
The Portal to Texas History
Texas Attorney General Opinion: C-264
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Waggoner Carr, regarding a legal question submitted for clarification: Construction of the provision in Article 13.50, Texas Election Code, relating to ineligibility of persons voting in a primary election to sign the application of an independent candidate.
Date:
June 5, 1964
Creator:
Texas. Attorney-General's Office.
System:
The Portal to Texas History
Texas Attorney General Opinion: C-325
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Waggoner Carr, regarding a legal question submitted for clarification: Whether premium notes executed by Texas residents constitute “Texan Securities” within the meaning of Art. 7064, V.C.S.
Date:
October 5, 1964
Creator:
Texas. Attorney-General's Office.
System:
The Portal to Texas History
Texas Attorney General Opinion: C-326
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Waggoner Carr, regarding a legal question submitted for clarification: Use of the change fund created by the provisions of Article 1630b, V.C.S., by county officials, and related questions.
Date:
October 5, 1964
Creator:
Texas. Attorney-General's Office.
System:
The Portal to Texas History
Texas Attorney General Opinion: C-344
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Waggoner Carr, regarding a legal question submitted for clarification: Whether, under the present Sheriff’s budget, proper budgeting arrangements can be made for the purchase of a helicopter for the Sheriff’s Department.
Date:
November 5, 1964
Creator:
Texas. Attorney-General's Office.
System:
The Portal to Texas History
Texas Attorney General Opinion: C-346
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Waggoner Carr, regarding a legal question submitted for clarification: Whether under stated facts a "lessor" of motor vehicles propelled with special fuels which are leased to and operated entirely by the "lessee" or his drivers in interstate commerce may be construed to be the "user" of the special fuels delivered to such vehicles or imported in the fuel supply tanks of the motor vehicles and consumed on the Texas highways.
Date:
November 5, 1964
Creator:
Texas. Attorney-General's Office.
System:
The Portal to Texas History