Aboriginal peoples of Chukotka

Before the Aboriginal peoples of Chukotka were introduced to European culture, they lived a traditional way of life which defined their material and spiritual culture. During the integration into the Russian State, all spheres of their life went through various transformations. This article presents an overiew of the history of Aboriginal peoples of Chukotka (Yupiget, Chukchi, Evens, Koryaks, Chuvans, Yukagirs and Kereks).Avant que les peuples autochtones de la Tchoukotka eussent été introduits à la culture européenne, ils avaient un mode de vie traditionnel définissant leur culture matérielle et spirituelle. Lors de leur intégration à l’État russe, toutes les sphères de leur vie ont subi diverses transformations. Cet article présente une vue d’ensemble de l’histoire des peuples autochtones de la Tchoukotka (Yupiget, Chukchi, Evens, Koryaks, Chuvans, Yukagirs et Kereks)

Alternate methods of applying diffusants to silicon solar cells

Low-melting phosphate and borate glasses were screen printed on silicon wafers and heated to form n and p junctions. Data on surface appearance, sheet resistance and junction depth are presented. Similar data are reported for vapor phase transport from sintered aluminum metaphosphate and boron-containing glass-ceramic solid sources. Simultaneous diffusion of an N(+) layer with screen-printed glass and a p(+) layer with screen-printed Al alloy paste was attempted. No p(+) back surface field formation was achieved. Some good cells were produced but the heating in an endless-belt furnace caused a large scatter in sheet resistance and junction depth for three separate lots of wafers

Self-consistent analysis of electric field effects on Si δ-doped GaAs

We theoretically study the subband structure of single Si delta -doped GaAs inserted in a quantum well and subject to an electric field applied along the growth direction. We use an efficient self-consistent procedure to solve simultaneously the Schrodinger and Poisson equations for different values of electric field and temperature. We thus find the confining potential, the subband energies and their corresponding envelope functions, the subband occupations, and the oscillator strength of intersubband transitions. Opposite to what is usually the case when dealing with the quantum-confined Stark effect in ordinary quantum wells, we observe an abrupt drop of the energy levels whenever the external field reaches a certain value. This critical value of the field is seen to depend only slightly on temperature. The rapid change in the energy levels is accompanied by the appearance of a secondary well in the confining potential and a strong decrease of the oscillator strength between the two lowest subbands. These results open the possibility to design devices for use as optical filters controlled by an applied electric field.Publicad

Pushing the limits of energetic materials - the synthesis and characterization of dihydroxylammonium 5,5'-bistetrazole-1,1'-diolate

The safe preparation and characterization (XRD, NMR and vibrational spectroscopy, DSC, mass spectrometry, sensitivities) of a new explosive dihydroxylammonium 5,5'-bistetrazole-1,1'-diolate (TKX-50) that outperforms all other commonly used explosive materials is detailed. While much publicized high-performing explosives, such as octanitrocubane and CL-20, have been at the forefront of public awareness, this compound differs in that it is simple and cheap to prepare from commonly available chemicals. TKX-50 expands upon the newly exploited field of tetrazole oxide chemistry to produce a material that not only is easily prepared and exceedingly powerful, but also possesses the required thermal insensitivity, low toxicity, and safety of handling to replace the most commonly used military explosive, RDX (1,3,5-trinitro-1,3,5-triazacyclohexane). In addition, the crystal structures of the intermediates 5,5'-bistetrazole-1,1'-diol dihydrate, 5,5'-bistetrazole-1,1'-diol dimethanolate and dimethylammonium 5,5'-bistetrazole-1,1'-diolate were determined and presented

Special Libraries, October 1924

Volume 15, Issue 8https://scholarworks.sjsu.edu/sla_sl_1924/1007/thumbnail.jp

Variables Impacting First Time Pass Rates of MSOT Students

To enter practice as an occupational therapist, one must complete an occupational therapy program at an accredited institution and then pass a national certification exam. This exam is called the National Board for Certification in Occupational Therapy (NBCOT) Exam. Individuals can take the exam more than once to achieve a passing score but must pay a fee each time. Not passing the first time can lead to stress, increased costs, and delayed entrance into the profession. Thus, being a first-time passer is ideal. The purpose of this retrospective quantitative study was to identify variables impacting first time pass rates of occupational therapy master’s students. Variables found to be significantly higher in the first time pass group compared to the multiple attempts group include high school grade point average (hsGPA), Scholastic Aptitude Test (SAT) scores, whether or not the student earned an A in high school chemistry or biology, whether or not the student took high school physics, undergraduate college GPA, whether or not the student earned an A in certain occupational therapy intervention courses, and percentage correct on the Occupational Therapy Knowledge Exam (OTKE). Results of this study can inform occupational therapy programs’ admissions standards and help educators better prepare and support students throughout the entire curriculum to facilitate first time success on the NBCOT exam

Rotational behavior of the main-sequence stars and its plausible consequences concerning for- mation of planetary systems

Main sequence star rotation and planetary system origi