Impact 2001

Index Competitive Agricultural Systems in a Global Economy ............................................................. 1 Safe and Secure Food and Fiber Systems ............................................................. 20 Healthy, Well-Nourished Population ............................................................. 28 Greater Harmony Between Agriculture and the Environment ............................................................. 38 Economic Development and Quality of Life for People and Communities ............................................................. 46 Society-Ready Graduates ............................................................. 5

Impact 2001

Index Competitive Agricultural Systems in a Global Economy ............................................................. 1 Safe and Secure Food and Fiber Systems ............................................................. 20 Healthy, Well-Nourished Population ............................................................. 28 Greater Harmony Between Agriculture and the Environment ............................................................. 38 Economic Development and Quality of Life for People and Communities ............................................................. 46 Society-Ready Graduates ............................................................. 5

Cognition based bTBI mechanistic criteria; a tool for preventive and therapeutic innovations

Blast-induced traumatic brain injury has been associated with neurodegenerative and neuropsychiatric disorders. To date, although damage due to oxidative stress appears to be important, the specific mechanistic causes of such disorders remain elusive. Here, to determine the mechanical variables governing the tissue damage eventually cascading into cognitive deficits, we performed a study on the mechanics of rat brain under blast conditions. To this end, experiments were carried out to analyse and correlate post-injury oxidative stress distribution with cognitive deficits on a live rat exposed to blast. A computational model of the rat head was developed from imaging data and validated against in vivo brain displacement measurements. The blast event was reconstructed in silico to provide mechanistic thresholds that best correlate with cognitive damage at the regional neuronal tissue level, irrespectively of the shape or size of the brain tissue types. This approach was leveraged on a human head model where the prediction of cognitive deficits was shown to correlate with literature findings. The mechanistic insights from this work were finally used to propose a novel helmet design roadmap and potential avenues for therapeutic innovations against blast traumatic brain injury

Assessment of Fluid Cavitation Threshold Using a Polymeric Split Hopkinson Bar-Confinement Chamber Apparatus

The authors would like to acknowledge the Natural Sciences and Engineering Research Council of Canada for financial support, and Compute Canada and Sharcnet for providing the necessary computing resources.Mild Traumatic Brain Injury (mTBI) has been associated with blast exposure resulting from the use of improvised explosive devices (IEDs) in recent and past military conflicts. Experimental and numerical models of head blast exposure have demonstrated the potential for high negative pressures occurring within the head at the contre-coup location relative to the blast exposure, and it has been hypothesized that this negative pressure could result in cavitation of Cerebrospinal Fluid (CSF) surrounding the brain, leading to brain tissue damage. The cavitation threshold of CSF, the effect of temperature, and the effect of impurities or dissolved gases are presently unknown. In this study, a novel Polymeric Split Hopkinson Pressure Bar and confinement chamber apparatus were used to generate loading in distilled water similar to the conditions in the vicinity of the CSF during blast exposure. Cavitation was identified using high-speed imaging of the event, and a validated numerical model of the apparatus was applied to determine the pressure in the fluid during the exposure. Increasing the water temperature resulted in a decrease in the 50% probability of cavitation from 21 °C (−3320 kPa ± 3%) to 37 °C (−3195 kPa ± 5%) in agreement with the theoretical values, but was not statistically significant. Importantly, the effect of water treatment had a significant effect on the cavitation pressure for water with wetting agent (−3320 kPa ± 3%), degassed water (−1369 kPa ± 16%) and untreated distilled water (−528 kPa ± 25%). Thus, reducing dissolved gases through degassing or the use of a wetting agent significantly increases the cavitation pressure and reduces the variability of the cavitation pressure threshold

Identity Politics: the Private Eye (“I”) in Walter Mosley’s Detective Fiction

Mosley’s Easy Rawlins series follows the hard-boiled tradition but also shares with much ethnic fiction strategies for exposing social and economic disparities in the U. S. Crime thus becomes a metaphor for all that is wrong in America, a vehicle for critiquing injustice based on racial discrimination.Moreover, Mosley’s reluctant sleuth is also engaged in a more important mystery: who he is and where he wants to be in a society that does not value him, a society that makes black men invisible second class citizens. Easy’s personal identity, constantly negotiated and challenged, is the biggest mystery of all, and cracking that mystery becomes the most intriguing aspect of the series. As Roger Berger has argued, Mosley himself is highly ambivalent about his identity as a writer of hard-boiled fiction

Identity Politics: the Private Eye (“I”) in Walter Mosley’s Detective Fiction

Mosley’s Easy Rawlins series follows the hard-boiled tradition but also shares with much ethnic fiction strategies for exposing social and economic disparities in the U. S. Crime thus becomes a metaphor for all that is wrong in America, a vehicle for critiquing injustice based on racial discrimination.Moreover, Mosley’s reluctant sleuth is also engaged in a more important mystery: who he is and where he wants to be in a society that does not value him, a society that makes black men invisible second class citizens. Easy’s personal identity, constantly negotiated and challenged, is the biggest mystery of all, and cracking that mystery becomes the most intriguing aspect of the series. As Roger Berger has argued, Mosley himself is highly ambivalent about his identity as a writer of hard-boiled fiction

Low-level-waste-treatment handbook

The initial draft of the Low-Level Waste Treatment Handbook has been prepared and submitted to the DOE Low-Level Waste Management Program for review and comment. A revised draft is scheduled to be delivered to DOE Headquarters in December 1982. The Handbook is designed to be useful to all individuals and groups concerned with low-level wastes. It is one of several volumes that will ultimately comprise a Low-Level Waste Technology Handbook. The objective of the Low-Level Waste Treatment Handbook is to present an overview of current practices related to the segregation, classification, volume reduction, solidification, handling, packaging, and transportation of LLW for disposal in a shallow land burial facility. The Handbook is intended to serve as a guide to individuals interested in the treatment and handling of low-level radioactive waste. The Handbook will not explicitly tell the user how to design and operate LLW treatment facilities, but rather will identify (1) kinds of information required to evaluate the options, (2) methods that may be used to evaluate these options, and (3) limitations associated with the selection of the treatment options. The focus of the Handbook is providing guidance on how to do waste treatment for disposal by shallow land burial

An lntegrated Growth and Analysis System for In-Situ XAS Studies of Metal- Semiconductor Interactions

A UHV system for in-situ studies of metal-semiconductor interactions has been designed and assembled at North Carolina State University and recently installed and tested at the NSLS. The UHV system consists of interconnected deposition and analysis chambers, each of which is capable of maintaining a base pressure of approximately 1 x 10-10 Torr. Up to three materials can be co-deposited on 25 mm wafers by electron-beam evaporation. Substrate temperature can be controlled in the range 30-900 °C during deposition, and the growth process may be monitored with RHEED. The deposited materials and their reaction products can be studied in-situ with a variety of technique: XAFS, AES, XPS, UPS and ARXPS/UPS. We describe the capabilities of the system and present our first EXAFS results on the stabilization of Co + 2 Si films co-deposited on Si0.8Ge0.2 alloys. Preliminary results indicate that Co + 2Si forms a stable film on Si0.8Ge0.2 with a "CoSi2-like" reaction path. As is tie case with Co/Si0.8Ge0.2, silicide formation is complete at 700 °C. However, the Co+2Si/0.8Ge0.2 system does not undergo a CoSi→ CoSi2 transition when annealed at 500-700 °C, and exhibits only weak CoSi features in this.temperature range