1,007 research outputs found
Alignment and Aperture Scan at the Fermilab Booster
The Fermilab booster has an intensity upgrade plan called the Proton
Improvement plan (PIP). The flux throughput goal is 2E17 protons/hour, which is
almost double the current operation at 1.1E17 protons/hour. The beam loss in
the machine is going to be the source of issues. The booster accelerates beam
from 400 MeV to 8 GeV and extracts to the Main Injector. Several percent of the
beam is lost within 3 msec after the injection. The aperture at injection
energy was measured and compared with the survey data. The magnets are going to
be realigned in March 2012 in order to increase the aperture. The beam studies,
analysis of the scan and alignment data, and the result of the magnet moves
will be discussed in this paper.Comment: 3 pp. 3rd International Particle Accelerator Conference (IPAC 2012)
20-25 May 2012, New Orleans, Louisian
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Precision LCVD System Design with Real Time Process Control
A Laser Chemical Vapor Deposition (LCVD) system was designed using a fixed 100
Watt C02 laser focused on a moveable substrate. Temperature and height measurement devices
monitor the reaction at the point of deposition to provide feedback for controlling the process.
The LCVD system will use rapid prototyping technology to directly fabricate fully threedimensional ceramic, metallic, and composite parts of arbitrary shape. Potential applications
include high temperature structures, electronic/photonic devices, and orthopaedic implants.Mechanical Engineerin
Lessons Learned From a 20-Year Collaborative Study on American Black Bears
In the 1980s, black bears (Ursus americanus) began expanding into historic habitats in northwestern Nevada, USA. Over a period of \u3e30 years, black bears recolonized areas where human populations have also increased. Our research represents one of, if not the longest-running and earliest comparative studies of a black bear population at wildlandâurban interface and wildland areas in North America. As the population increased, we observed: 1) increasing humanâbear conflicts in areas where several generations of people had lived in almost total absence of bears (70â80+ years); 2) changes in attitudes by the public toward bears and in the social realm regarding garbage management; and 3) changes in the demographics, behavior, and ecology of this bear population, due to an increasing human footprint on the landscape. Herein, we discuss a few of the lessons learned from this long-term study and the value of a collaborative approach between a state agency, a university, and an international conservation organization. Our collaborative approach allowed us to better understand the ecological, demographic, and behavioral changes in a large, recolonizing carnivore that is a functional omnivore, often residing at the wildland-urban interface, and to use these data to impact conservation and management. Throughout the study, our data were used extensively by various media, emphasizing public education about humanâbear conflicts. This media platform proved important because of the impact it had on wildlife conservation. For example, partly in response to media coverage of our data-based education efforts, 3 Nevada counties enacted garbage management ordinances, and the Nevada legislature passed a state law prohibiting the feeding of large game mammals. Further, several million dollars in bear-resistant garbage containers are now used in the region by the public and government entities. The end result of these conservation measures has been a recolonization of the Great Basin Desert by bears from the Lake Tahoe Basin and Sierra-Nevada Range into portions of Nevada where bears have been absent for \u3e80 years
Atomic resolution scanning tunneling microscopy images of Au(111) surfaces in air and polar organic solvents
Atomic features of a closeâpacked metal surface have been observed for the first time by scanning tunneling microscopy in organic polar solvents. Evaporated gold films, exhibiting large reconstructed (111) terraces, have been imaged with a resolution far superior to previous results in aqueous environments
Mars mission solar array Semiannual progress report, period ending 31 Dec. 1969
Design and testing of beryllium-structure solar panel for Mars missio
Course Engagement as a Mediator between Student-Instructor Personality Fit and Academic Outcomes
While the positive effects of personality similarity on attraction are well established, this research has made a limited transition to the person-environment (P-E) fit research. Following Schneiderâs (1987) attraction-selection-attrition model based on similarity-attraction literature, the following study proposes that student-instructor relationships characterized by high levels of perceived personality congruence (i.e., fit) will lead to more motivated and engaged students. The study proposes a model to explain the relationship between student-instructor fit, student course engagement, and student outcomes, whereby engagement should mediate the relationship between perceived student-instructor personality fit and student outcomes of course performance, course satisfaction, and commitment to the academic discipline. A sample of introductory psychology course students completed perceived personality fit and student course engagement questionnaires midway through the semester and final course evaluations at the close of the semester. The proposed theoretical model was not supported; however, findings indicated a significant relationship between personality fit and elements of engagement. Furthermore, some factors of engagement discriminately predicted course outcomes. The proposed role of engagement as a mediating variable was only moderately supported in the fit-satisfaction relationship. Modifications to the proposed model are explored and implications for future research in student-instructor fit and student course engagement are discussed
HumanâBlack Bear Conflicts: A Review of Common Management Practices
The objective of this monograph is to provide wildlife professionals, who respond to humanâbear conflicts, with an appraisal of the most common techniques used for mitigating conflicts as well as the benefits and challenges of each technique in a single document. Most humanâblack bear conflict occurs when people make anthropogenic foods like garbage, dog food, domestic poultry, or fruit trees available to bears. Bears change their behavior to take advantage of these resources and may damage property or cause public safety concerns in the process. Managers and the public need to understand the available tools to stop humanâbear conflict and reduce effects on bear populations.https://digitalcommons.usu.edu/hwi_monographs/1002/thumbnail.jp
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