Mobility of Edge Dislocations in the Basal‐Slip System of Zinc

This paper presents the results of measurements of the velocities of 〈1210〉 (0001) edge dislocations in zinc as a function of applied shear stress. All tests were conducted at room temperature on 99.999% pure zinc monocrystals. Dislocations were revealed by means of the Berg‐Barrett x‐ray technique. Stress pulses of microsecond duration were applied to the test specimens by means of a torsion testing machine. Applied resolved shear stresses ranged from 0 to 17.2×10^6 dyn∕cm^2 and measured dislocation velocities ranged from 40–700 cm∕sec. The results of this study indicate that the velocity of edge dislocations in the basal slip system of zinc is linearly proportional to the applied resolved shear stress. These results are analyzed in terms of the phonon drag theory. Agreement between this theory and the results reported here is quite good

Forgotten Soldiers from a Forgotten War: Oral History Testimonies of African American Korean War Veterans

Otis Eliot Pope, Jr. Loyola University Chicago FORGOTTEN SOLDIERS FROM A FORGOTTEN WAR: ORAL HISTORY TESTIMONIES OF AFRICAN AMERICAN KOREAN WAR VETERANS This study seeks to illuminate the motivations, struggles, conflicts, and contributions African American soldiers made to the US military during the Korean War. Forty oral history testimonies from African American Korean War veterans were used for this dissertation. The findings of this dissertation illustrate that previously held beliefs about African American participation in the Korean War were inaccurate. My research indicates a variety of reasons, including a desire for upward mobility, influenced African Americans to join the US military. Additionally, the training African American soldiers received were equal to and sometimes better than that of their White counterparts. Also, while African American soldiers faced racism while they were serving their country during the war, they still served their country honorably. The Korean War’s impact on African American soldiers was both negative and positive. The results of my findings offer insight on why African Americans joined the US military, how they were prepared for war, what challenges they faced on the battlefield, and how the Korean War changed their lives. My dissertation concludes that the Korean War was transformative for African American soldiers, helping some achieve financial stability, while leaving others with psychological scars

Evolving Roles of Librarians: Juggling Print and Electronic Collections While Making Meaningful Connections

The traditional role of librarians has long been to support the university’s needs through instruction, collection development, and research assistance. Pittsburg State University’s challenge has been to balance our print and electronic collections at a university whose programs sometimes do not draw enough on library resources while also creating meaningful connections with students and faculty. In an effort to increase the relevancy of our collections and create meaningful connections with the university community, we have been actively creating opportunities for patrons to create content in the library. This has allowed users to engage with library resources and services in a new and different way while helping to shape the space. The goal is to make users content creators and empower them to be invested in the future development of the library space. This approach allows us to share with students, faculty, and staff the wide variety of library resources and services that can be both informative and fun

Hot forming of silicon sheet, silicon sheet growth development for the large area silicon sheet task of the low cost silicon solar array project

The hot workability of polycrystalline silicon was studied. Uniaxail stress-strain curves are given for strain rates in the range of .0001 to .1/sec and temperatures from 1100 to 1380 C. At the highest strain rates at 1380 C axial strains in excess of 20% were easily obtainable without cracking. After deformations of 36%, recrystallization was completed within 0.1 hr at 1380 C. When the recrystallization was complete, there was still a small volume fraction of unrecyrstallized material which appeared very stable and may degrade the electronic properties of the bulk materials. Texture measurements showed that the as-produced vapor deposited polycrystalline rods have a 110 fiber texture with the 110 direction parallel to the growth direction and no preferred orientation about this axis. Upon axial compression perpendicular to the growth direction, the former 110 fiber axis changed to 111 and the compression axis became 110 . Recrystallization changed the texture to 110 along the former fiber axis and to 100 along the compression axis

Evolving Roles of Librarians: Juggling Print and Electronic Collections While Making Meaningful Connections

The traditional role of librarians has long been to support the university’s needs through instruction, collection development, and research assistance. Pittsburg State University’s challenge has been to balance our print and electronic collections at a university whose programs sometimes do not draw enough on library resources while also creating meaningful connections with students and faculty. In an effort to increase the relevancy of our collections and create meaningful connections with the university community, we have been actively creating opportunities for patrons to create content in the library. This has allowed users to engage with library resources and services in a new and different way while helping to shape the space. The goal is to make users content creators and empower them to be invested in the future development of the library space. This approach allows us to share with students, faculty, and staff the wide variety of library resources and services that can be both informative and fun

Mobility of Basal Dislocations in Zinc

This paper reports the results of an experimental study in which basal dislocation velocities were measured in zinc as a function of stress, temperature and dislocation orientation. The velocities were measured using the direct or Gilman-Johnston technique in which the individual dislocations themselves are observed. Tests were performed on 99.999% purity monocrystals. The applied resolved shear stress ranged from 0 to about 20 x 10^6 dynes/cm^2, the load durations were in the microsecond range, the test temperatures were 300, 223, 173 and 123 °K, and the measured velocities ranged from about 200 to 2000 cm/sec. Since the velocities are a linear function of stress and the velocity at a given stress increases with decreasing temperature, the velocity controlling mechanism is believed to be an interaction between the moving dislocations and the thermal waves of the lattice. The phonon viscosity and the phonon scattering mechanisms are compared to the data

Juggling Collections and Connections to Community: Changing Role of Libraries

The traditional role of the academic librarian has long been the support of the university’s needs through instruction, collection development, and research assistance. Over the decades, this role has evolved to match the needs of the 21st century university. At Leonard H. Axe Library, the challenge has been to balance the print and electronic collections at a university whose programs do not draw enough on library resources while also creating meaningful connections with students and faculty. To increase collection relevancy and make meaningful connections, the library has been creating opportunities for patrons to be content-creators and to engage with library resources and services in new ways, with the benefit of empowering users to be invested in the future development of the library space. This approach allows us to share with the university community the wide variety of library resources and services that can be both informative and fun

Juggling Collections and Connections to Community: Changing Role of Libraries

The traditional role of the academic librarian has long been the support of the university’s needs through instruction, collection development, and research assistance. Over the decades, this role has evolved to match the needs of the 21st century university. At Leonard H. Axe Library, the challenge has been to balance the print and electronic collections at a university whose programs do not draw enough on library resources while also creating meaningful connections with students and faculty. To increase collection relevancy and make meaningful connections, the library has been creating opportunities for patrons to be content-creators and to engage with library resources and services in new ways, with the benefit of empowering users to be invested in the future development of the library space. This approach allows us to share with the university community the wide variety of library resources and services that can be both informative and fun

Machine for Producing Square Torsion Pulses of Microsecond Duration

A dynamic torsion testing machine has been built for the purpose of applying a known constant shear stress to a 12.7-mm-diam cylindrical test specimen for very short periods of time. The shear stress at the surface of the specimen rises from zero to any desired value in the range 0 to 3000 psi, within a period of 4 to 6 μsec. The time at constant stress varies linearly with axial position from the free end of the specimen ranging from 0 to about 500 μsec. The stress is removed within a period of 4 to 6 μsec and for short specimens it remains essentially zero thereafter. This machine has been developed for the measurement of dislocation velocities up to 25 m/sec in metal single crystals