Low Energy Properties of the Kondo chain in the RKKY regime

We study the Kondo chain in the regime of high spin concentration where the low energy physics is dominated by the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction. As has been recently shown (A. M. Tsvelik and O. M. Yevtushenko, Phys. Rev. Lett 115, 216402 (2015)), this model has two phases with drastically different transport properties depending on the anisotropy of the exchange interaction. In particular, the helical symmetry of the fermions is spontaneously broken when the anisotropy is of the easy plane type (EP). This leads to a parametrical suppression of the localization effects. In the present paper we substantially extend the previous theory, in particular, by analyzing a competition of forward- and backward- scattering, including into the theory short range electron interactions and calculating spin correlation functions. We discuss applicability of our theory and possible experiments which could support the theoretical findings.Comment: 24 pages, 8 figures, 5 appendice

Advanced emergency openings for commercial aircraft

Explosively actuated openings in composite panels are proposed to enhance passenger survivability within commercial aircraft by providing improvements in emergency openings, fuselage venting, and fuel dump. The concept is to embed a tiny, highly stable explosive cord in the periphery of a load-carrying composite panel; on initiation of the cord, the panel is fractured to create a well-defined opening. The panel would be installed in the sides of the fuselage for passenger egress, in the top of the fuselage for smoke venting, and in the bottoms of the fuel cells for fuel dump. Described are the concerns with the use of explosive systems, safety improvements, advantages, experimental results, and recommended approach to gain acceptance and develop this concept

Consensus on Potential Changes in Public Health Leadership Competencies as a Result of the COVID-19 Pandemic Among Washington State Local Health Jurisdictions

Effective leadership practices among the public health field are critical in the process of influencing positive health outcomes across populations. While many competencies or skill sets that are needed of leaders to promote ideal public health functions have been identified and discussed in previous literature, there has become an arising need for evaluation of potential changes due to the COVID-19 pandemic. To do this, the Delphi research method was utilized through the implementation of a four-round questionnaire process to gain consensus among participating leaders in ten different Washington State Local Health Jurisdictions. The two main research questions of this study were 1.) What are the public health leadership competencies considered to be most important in Washington State Local Health Jurisdictions? and 2.) Have public health leadership competencies among Washington State Local Health Jurisdictions changed because of the COVID-19 pandemic? Findings included that the top five ranked public health leadership competencies identified to have changed and/or become more important because of the COVID-19 pandemic were: Communication, Collaboration, Community Partnerships, Strategic Skills, and Being Flexible/Adaptable. The response rate from Round One to Round Four was 83% while the overall level of consensus among this final list was 80%. In analysis, there have been both changes and increases in importance among public health leadership competencies from before the COVID-19 pandemic to present-day. Implications for practice largely include the need for training, engagement, and practice among public health leadership surrounding the final five competencies from this study. Future research in this area is suggested to examine singular competencies at a time or use a different study design to understand these competencies further

Service life evaluation of rigid explosive transfer lines

This paper describes a joint Army/NASA-sponsored research program on the service life evaluation of rigid explosive transfer lines. These transfer lines are used to initiate emergency crew escape functions on a wide variety of military and NASA aircraft. The purpose of this program was to determine quantitatively the effects of service, age, and degradation on rigid explosive transfer lines to allow responsible, conservative, service life determination. More than 800 transfer lines were removed from the U.S. Army AH-1G and AH-1S, the U.S. Air Force B-1 and F-111, and the U.S. Navy F-14 aircraft for testing. The results indicated that the lines were not adversely affected by age, service, or a repeat of the thermal qualification tests on full-service lines. Extension of the service life of rigid explosive transfer lines should be considered, since considerable cost savings could be realized with no measurable decrease in system reliability

Quantitative understanding of explosive stimulus transfer

The mechanisms of detonation transfer across hermetically sealed interfaces created by necessary interruptions in high explosive trains, such as at detonators to explosive columns, field joints in explosive columns, and components of munitions fuse trains are demostrated. Reliability of detonation transfer is limited by minimizing explosive quantities, the use of intensitive explosives for safety, and requirements to propagate across gaps and angles dictated by installation and production restraints. The major detonation transfer variables studied were: explosive quanity, sensitivity, and thickness, and the separation distances between donor and acceptor explosives

Fault injector for middleware applications

Issued as final reportRaytheon Compan

Repellent Effects on Distribution of Steers on Native Range

Poor distribution of livestock use over a range is a common limitation to proper and optimum use of many ranges. When the range is a common limitation to proper and optimum use of many ranges. When the range as a whole is properly used, livestock typically overuse those areas that are especially attractive to them. Use of conventional distribution tools are sometimes inappropriate or ineffective in correcting livestock distribution problems. This study evaluated a commercially available big game repellent for deterring yearling steer use of preferred grazing areas. Repellent sprayed areas had fewer cow chips (P\u3c.10) 1 week following application on subirrigated range sites but not on silty range sites. In general, treatment did not deter occupation of yearling steers on preferred grazing areas around potholes