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820 results on '"Salama, K."'

101. Climate change-induced species distribution modeling in hyper-arid ecosystems

Author

Mohamed Mousa, Taoufik Ksiksi, Salama K. Al Kaabi, Fatima E. Hassan, K Remya, Sanad M. Fereaa, Shamsa M. Alameemi, and Shima K. Al-Badi

Subjects
0106 biological sciences, 010504 meteorology & atmospheric sciences, General Immunology and Microbiology, biology, Land use, Species distribution, Elevation, Climate change, General Medicine, biology.organism_classification, 010603 evolutionary biology, 01 natural sciences, General Biochemistry, Genetics and Molecular Biology, Habitat, Prosopis cineraria, Community Climate System Model, Environmental science, Precipitation, Physical geography, General Pharmacology, Toxicology and Pharmaceutics, 0105 earth and related environmental sciences
Abstract

Background: The impact of climate change on selected plant species from the hyper-arid landscape of United Arab Emirates (UAE) was assessed through modeling of their habitat suitability and distribution. Calotropis procera, Prosopis cineraria and Ziziphus spina-christi were used for this study. The specific objectives of this study were to identify the current and future (for 2050s and 2070s) suitable habitats distribution using MaxEnt, an Ecological Envelope Model. Methods: The adopted method consists of extraction of current and future bioclimatic variables together with their land use cover and elevation for the study area. MaxEnt species distribution model was then used to simulate the distribution of the selected species. The projections are simulated for the current date, the 2050s and 2070s using Community Climate System Model version 4 with representative concentration pathway RCP4.5. Results: The current distribution model of all three species evolved with a high suitable habitat towards the north eastern part of the country. For C. procera, an area of 1775 km2 is modeled under highly suitable habitat for the current year, while it is expected to increase for both 2050s and 2070s. The current high suitability of P. cinararia was around an area of 1335 km2 and the future projection revealed an increase of high suitability habitats. Z. spina-christi showed a potential area of 5083 km2 under high suitability and it might increase in the future. Conclusions: Precipitation of coldest quarter (BIO19) had the maximum contribution for all the three species under investigation.

Published
2019
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104. Millimeter wave surface resistance of grain-aligned Y1Ba2Cu3O(x) bulk material

Author

Wosik, J, Kranenburg, R. A, Wolfe, J. C, Selvamanickam, V, and Salama, K

Subjects
Solid-State Physics
Abstract

Measurements of the millimeter wave surface resistance of grain-aligned YBa2Cu3O(x) bulk material grown by a liquid phase process are reported. The measurements were performed by replacing the endplate of a TE011 cylindrical copper cavity with the superconducting sample. Surface resistance was measured for samples with surfaces oriented perpendicular and parallel to the c-axis of the grains. It is shown that, for the parallel configuration, the surface resistance at 77 K and 80 GHz is typically near 100 milliohms. For a very well-aligned sample with a very low density of Y2BaCuO(y) precipitates, measured in the perpendicular configuration, the transition width (10-90 percent) is about 2 K, and the surface resistance is less than 50 milliohms at 88 K. The effect of microstructure on surface resistance is discussed.

Published
1991
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105. Acoustoelastic characterisation of materials

Author

Cantrell, J. H and Salama, K

Subjects
Acoustics
Abstract

Recent developments in the use of nonlinear acoustoelastic techniques for the characterization of materials are reviewed, with particular attention given to the quantitative modeling of the acoustoelastic properties of multiphase alloys in terms of material composition. Topics discussed include general theory of acoustoelasticity, models of two-phase systems, measurement techniques, acoustic nonlinearity parameters and material properties, stress-temperature dependence of sound velocity, and low field magnetoacoustics. The discussion is illustrated by results obtained for steels and aluminum alloys with second phase precipitates.

Published
1991

108. Millimeter wave surface resistance of grain-aligned Y1Ba2Cu3O(x) bulk material

Author

Wosik, J, Kranenburg, R. A, Wolfe, J. C, Selvamanickam, V, and Salama, K

Subjects
Solid-State Physics
Abstract

Measurements are reported of the millimeter-wave surface resistance of grain-aligned YBa2Cu3O(x) bulk material grown by a liquid-phase process. The measurements were performed by replacing the endplate of a TE(011) cylindrical copper cavity with the superconducting sample. Surface resistance was measured for samples with surfaces oriented perpendicular and parallel to the c-axis of the grains. For the parallel configuration, the surface resistance at 77 K and 80 GHz is given. For a very well-aligned sample with a very low density of Y2BaCuO(y) precipitates, measured in the perpendicular configuration, the transition width (10-90 percent) is about 2 K and the surface resistance is derived at 88 K. The effect of microstructure on surface resistance is discussed.

Published
1990

110. Melt texturing of preferentially aligned YBa(2)Cu(3)O(x) superconductor by a seeded directional solidification method

Author

Lee, D.F., Partsinevelos, C.S., Presswood, R.G., Jr., and Salama, K.

Subjects
Superconductors -- Design and construction, Physics
Abstract

A seeded directional solidification method is used to fabricate single-domained YBa2Cu3Ox superconductors having long lengths. The melt texture is manipulated using this technique to produce large cross-sectional areas and predetermined grain alignment. The conducting capacity of this superconductor is higher than that of the misaligned ones. Samples with small cross-sectional area exhibit Ic in the order of few thousand amperes.

Published
1994

116. Measurements of surface resistance of grain-aligned bulk material as a function of dc magnet field; weak link study

Author

Wosik, J., Xie, L.M., Halbritter, J., Chau, R., Samaan, A., Wolfe, J.C., Selvamanickam, V., and Salama, K.

Subjects
Bulk solids -- Measurement, Copper oxide superconductors -- Measurement, Superconductors -- Magnetic properties, Yttrium barium copper oxides -- Research, Business, Electronics, Electronics and electrical industries
Abstract

The crystallographic quality of the high textured structure of a YBa2Cu3Ox material was examined. Samples were fabricated by a liquid phase process. Electron spin resonance spectrometry coupled with continuous gas fow cryostat were used to obtain high sensitivity estimates of the temperature and direct current magnetic filed dependencies of the surface grain resistance of the sample bulk material. The nonlinear dependence of surface resistance to low magnetic fields was demonstrated.

Published
1993

118. Magnetic levitation and stiffness in melt-textured Y-Ba-Cu-O

Author

Hull, J.R., Mulcahy, T.M., Salama, K., Selvamanickam, V., Weinberger, B.R., and Lynds, L.

Subjects
High temperature superconductors -- Research, Superconductors -- Magnetic properties, Physics
Abstract

Levitation pressures of 100-400 kPa at 20K were produced in experiments to measure magnetic levitation and stiffness among different high-temperature superconductor (HTS) systems consisting of a permanent magnet elastically suspended above a motionless melt-textured sample of Y-Ba-Cu-O. Magnetization data was collected and correlated with existing data.

Published
1992

138. The value of auditing supply chains

Author

Salama, K. F., Luzzatto, D., Sianesi, Andrea, and Towill, D. R.

Subjects
Diagnostic tool, Best practices, Performance, Audit, Supply chain, Improvement projects
Published
2009

141. Preface

Author

SALAMA, K., primary, RAVI-CHANDAR, K., additional, TAPLIN, D.M.R., additional, and RAO, P. RAMA, additional

Published
1989
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