Search Results - "THAPA, S. B"

Numerical Investigation of the Effects of Leakage Flow From Guide Vanes of Francis Turbines using Alternative Clearance Gap Method by Gautam, S, Neopane, H P, Thapa, B S, Chitrakar, S, Zhu, B

“…Flow around the Guide vanes (GV) in Francis turbine differs with the shape of hydrofoils. The difference in the pressure of fluid travelling to pressure side…”
Get full text

Development of rotating disc apparatus for test of sediment-induced erosion in Francis runner blades by Rajkarnikar, B., Neopane, H.P., Thapa, B.S.

“…Sediment erosion in hydraulic turbines has been a major challenge in development of hydropower projects in Nepal. The hard abrasive material present in the…”
Get full text

Process optimization for the effective reduction of threading dislocations in MOVPE grown GaN using in situ deposited SiNx masks by HERTKORN, J, LIPSKI, F, BRÜCKNER, P, WUNDERER, T, THAPA, S. B, SCHOLZ, F, CHUVILIN, A, KAISER, U, BEER, M, ZWECK, J

“…In this study the in situ deposition of SiNx masks by metalorganic vapor phase epitaxy (MOVPE) has been optimized to achieve c-plane oriented GaN layers on…”
Get full text

Optimization of nucleation and buffer layer growth for improved GaN quality by Hertkorn, J., Brückner, P., Thapa, S.B., Wunderer, T., Scholz, F., Feneberg, M., Thonke, K., Sauer, R., Beer, M., Zweck, J.

“…By accurately optimizing the growth conditions for an oxygen doped AlN nucleation layer and for the subsequent epitaxial process the crystal quality of our GaN…”
Get full text

Saliva testing for COVID-19? by Sapkota, D., Thapa, S. B., Hasséus, B., Jensen, J. L.

Get full text

MOVPE growth of GaN around ZnO nanopillars by Thapa, S.B., Hertkorn, J., Wunderer, T., Lipski, F., Scholz, F., Reiser, A., Xie, Y., Feneberg, M., Thonke, K., Sauer, R., Dürrschnabel, M., Yao, L.D., Gerthsen, D., Hochmuth, H., Lorenz, M., Grundmann, M.

“…A multi-layer growth process is established for the growth of GaN on ZnO films and implemented to the growth of GaN around ZnO nanopillars using metalorganic…”
Get full text

Carbon related hillock formation and its impact on the optoelectronic properties of GaN/AlGaN heterostructures grown on Si(111) by Tetzner, H., Sana, P., Klesse, W. M., Capellini, G., Schubert, M. A., Thapa, S. B., Storck, P., Schroeder, T., Zoellner, M. H.

“…The integration of GaN on Si as large scale substrates still faces many hurdles. Besides the large difference in the lattice constant and the high thermal…”
Get full text

Structural and spectroscopic properties of AlN layers grown by MOVPE by Thapa, S.B., Kirchner, C., Scholz, F., Prinz, G.M., Thonke, K., Sauer, R., Chuvilin, A., Biskupek, J., Kaiser, U., Hofstetter, D.

“…The effects on surface morphology, crystal quality, and growth rate of undoped AlN layers grown on c -plane sapphire substrates due to the changes in growth…”
Get full text

XPS study of triangular GaN nano/micro-needles grown by MOCVD technique by Kumar, Mukesh, Kumar, Ashish, Thapa, S.B., Christiansen, S., Singh, R.

“…•Triangular GaN nano/micro scale needles (TGN) were grown on nickel coated c-plane sapphire substrate.•Morphology and crystalinity were analyzed using scanning…”
Get full text

Enhanced ultraviolet GaN photo-detector response on Si(111) via engineered oxide buffers with embedded Y2O3/Si distributed Bragg reflectors by Szyszka, A., Lupina, L., Lupina, G., Mazur, M., Schubert, M. A., Storck, P., Thapa, S. B., Schroeder, T.

“…Based on a virtual GaN substrate approach on Si(111) by a step graded double oxide (Sc2O3/Y2O3) buffer, we report a “proof of principle” study on the enhanced…”
Get full text

Zero lattice mismatch and twin-free single crystalline ScN buffer layers for GaN growth on silicon by Lupina, L., Zoellner, M. H., Niermann, T., Dietrich, B., Capellini, G., Thapa, S. B., Haeberlen, M., Lehmann, M., Storck, P., Schroeder, T.

“…We report the growth of thin ScN layers deposited by plasma-assisted molecular beam epitaxy on Sc2O3/Y2O3/Si(111) substrates. Using x-ray diffraction, Raman…”
Get full text

Photoluminescence of highly excited AlN: Biexcitons and exciton-exciton scattering by Leute, R. A. R., Feneberg, M., Sauer, R., Thonke, K., Thapa, S. B., Scholz, F., Taniyasu, Y., Kasu, M.

“…Low-temperature photoluminescence spectra of nominally undoped high quality AlN layers on SiC and Al 2 O 3 substrates are reported. Under high excitation…”
Get full text

Growth conditions and surface morphology of AlN MOVPE by Lobanova, A.V., Yakovlev, E.V., Talalaev, R.A, Thapa, S.B., Scholz, F.

“…Experimental and modeling studies of AlN metal-organic vapor phase epitaxy (MOVPE) are aimed at the analysis of surface morphology variations with growth…”
Get full text

Ocular telemedicine between Nepal and the USA: prevalence of vitreoretinal disease in rural Nepal by Ulrich, J N, Poudyal, G, Marks, S J, Vrabec, T R, Marks, B, Thapa, A B S, Shresta, M K, Ruit, S, Federman, J L

“…This study is aimed at reporting experiences with telemedicine between Nepal and the USA and at reporting the prevalence of age-related macular degeneration…”
Get more information

Growth and studies of Si-doped AlN layers by Thapa, S.B., Hertkorn, J., Scholz, F., Prinz, G.M., Leute, R.A.R., Feneberg, M., Thonke, K., Sauer, R., Klein, O., Biskupek, J., Kaiser, U.

“…Edge-type threading dislocations (TDs) can be reduced by increasing the epilayer thickness of undoped AlN grown on c -plane sapphire substrate by low pressure…”
Get full text

A case of precocious puberty in a setting with limited resources by Paudel, P K, Giri, S, Shrestha, P S, Shrestha, L, Thapa, S B, Shrestha, M

“…Precocious puberty is a rare condition characterized by the development of secondary sexual characteristics before the median age for the sex. It is either…”
Get full text

Psychiatric Disorders Among Tortured Bhutanese Refugees in Nepal by Van Ommeren, Mark, de Jong, Joop T. V. M, Sharma, Bhogendra, Komproe, Ivan, Thapa, Suraj B, Cardeña, Etzel

“…BACKGROUND The impact of torture on the distribution of psychiatric disorders among refugees is unknown. METHODS We surveyed a population-based sample of 418…”
Get full text

Farmers' perceptions of participation and institutional effectiveness in the management of mid-hill watersheds in Nepal by SHIVAKOTI, GANESH P., THAPA, SURENDRA B.

“…In the mid-hills of Nepal, as in many developing countries, gradually developing urban centers and increasing demand for agricultural produce, due to…”
Get full text

Maternal mental health in the time of the COVID-19 pandemic by Thapa, Suraj B, Mainali, Anustha, Schwank, Simone E, Acharya, Ganesh

Get more information

The Future of South Asian Cooperation: a Partnership for the Twenty-First Century by Thapa, Surya Bahadur

“…SOUTH ASIA IS ENTERING A DYNAMIC PHASE. ITS ECONOMIES ARE GROWING, AND ITS CITIZENS NO LONGER SEE THEMSELVES AS AN ISLAND IMMUNE TO THE GLOBAL FORCES OF…”
Get full text