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2,864 Matching Results
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Agriculture and Related Agencies: FY2013 Appropriations
This report discusses the Agriculture appropriations bill—formally known as the Agriculture, Rural Development, Food and Drug Administration, and Related Agencies Appropriations Act, which provides funding for the following agencies: the U.S. Department of Agriculture (USDA), the Food and Drug Administration (FDA), the Commodity Futures Trading Commission (CFTC).
Date:
July 10, 2012
Creator:
Monke, Jim
Object Type:
Report
System:
The UNT Digital Library
University of Texas Rio Grande Valley Operating Budget: 2019
Proposed budget for the University of Texas Rio Grande Valley outlining projected income and expenditures, with supporting documentation.
Date:
August 10, 2018
Creator:
University of Texas Rio Grande Valley
Object Type:
Book
System:
The Portal to Texas History
Texas State Law Library Annual Financial Report: 2016 [Amended]
Annual financial report of the Texas State Law Library documenting income, expenditures, and other relevant financial information for fiscal year 2016.
Date:
October 10, 2016
Creator:
Texas. State Law Library.
Object Type:
Report
System:
The Portal to Texas History
Teacher Quality Issues in the Elementary and Secondary Education Act
None
Date:
December 10, 2012
Creator:
Kuenzi, Jeffrey J.
Object Type:
Report
System:
The UNT Digital Library
Medal of Honor: History and Issues
This Congressional Research Service Report for Congress contains background information, current policy and benefits, and statutory restrictions pertaining to the Medal of Honor.
Date:
April 10, 2015
Creator:
Torreon, Barbara Salazar
Object Type:
Report
System:
The UNT Digital Library
The RHIC and RHIC Pre-Injectors Controls Systems: Status and Plans
For the past twelve years experiments at the Relativistic Heavy Ion Collider (RHIC) have recorded data from collisions of heavy ions and polarized protons, leading to important discoveries in nuclear physics and the spin dynamics of quarks and gluons. BNL is the site of one of the first and still operating alternating gradient synchrotrons, the AGS, which first operated in 1960. The accelerator controls systems for these instruments span multiple generations of technologies. In this report we will describe the current status of the Collider-Accelerator Department controls systems, which are used to control seven different accelerator facilities and multiple science programs (high energy nuclear physics, high energy polarized proton physics, NASA programs, isotope production, and multiple accelerator research and development projects). We will describe the status of current projects, such as the just completed Electron Beam Ion Source (EBIS), our R&D programs in superconducting RF and an Energy Recovery LINAC (ERL), innovations in feedback systems and bunched beam stochastic cooling at RHIC, and plans for future controls system developments.
Date:
October 10, 2011
Creator:
Brown, K. A.; Altinbas, Z.; Aronson, J.; Binello, S.; Campbell, I.; Costanzo, M. et al.
Object Type:
Article
System:
The UNT Digital Library
Age-related changes in the plasticity and toughness of human cortical bone at multiple length-scales
The structure of human cortical bone evolves over multiple length-scales from its basic constituents of collagen and hydroxyapatite at the nanoscale to osteonal structures at nearmillimeter dimensions, which all provide the basis for its mechanical properties. To resist fracture, bone’s toughness is derived intrinsically through plasticity (e.g., fibrillar sliding) at structural-scales typically below a micron and extrinsically (i.e., during crack growth) through mechanisms (e.g., crack deflection/bridging) generated at larger structural-scales. Biological factors such as aging lead to a markedly increased fracture risk, which is often associated with an age-related loss in bone mass (bone quantity). However, we find that age-related structural changes can significantly degrade the fracture resistance (bone quality) over multiple lengthscales. Using in situ small-/wide-angle x-ray scattering/diffraction to characterize sub-micron structural changes and synchrotron x-ray computed tomography and in situ fracture-toughness measurements in the scanning electron microscope to characterize effects at micron-scales, we show how these age-related structural changes at differing size-scales degrade both the intrinsic and extrinsic toughness of bone. Specifically, we attribute the loss in toughness to increased non-enzymatic collagen cross-linking which suppresses plasticity at nanoscale dimensions and to an increased osteonal density which limits the potency of crack-bridging mechanisms at micron-scales. The link between these …
Date:
August 10, 2011
Creator:
Zimmermann, Elizabeth A.; Schaible, Eric; Bale, Hrishikesh; Barth, Holly D.; Tang, Simon Y.; Reichert, Peter et al.
Object Type:
Article
System:
The UNT Digital Library
On the effect of x-ray irradiation on the deformation and fracture behavior of human cortical bone
In situ mechanical testing coupled with imaging using high-energy synchrotron x-ray diffraction or tomography imaging is gaining in popularity as a technique to investigate micrometer and even sub-micrometer deformation and fracture mechanisms in mineralized tissues, such as bone and teeth. However, the role of the irradiation in affecting the nature and properties of the tissue is not always taken into account. Accordingly, we examine here the effect of x-ray synchrotron-source irradiation on the mechanistic aspects of deformation and fracture in human cortical bone. Specifically, the strength, ductility and fracture resistance (both work-of-fracture and resistance-curve fracture toughness) of human femoral bone in the transverse (breaking) orientation were evaluated following exposures to 0.05, 70, 210 and 630 kGy irradiation. Our results show that the radiation typically used in tomography imaging can have a major and deleterious impact on the strength, post-yield behavior and fracture toughness of cortical bone, with the severity of the effect progressively increasing with higher doses of radiation. Plasticity was essentially suppressed after as little as 70 kGy of radiation; the fracture toughness was decreased by a factor of five after 210 kGy of radiation. Mechanistically, the irradiation was found to alter the salient toughening mechanisms, manifest by the …
Date:
January 10, 2010
Creator:
Barth, Holly D.; Launey, Maximilien E.; McDowell, Alastair A.; Ager, Joel W., III & Ritchie, Robert O.
Object Type:
Article
System:
The UNT Digital Library