Half-heusler alloys are fascinating thermoelectric materials because they have superior mechanical and transport properties. In this study, we used dft+u calculations the boltztrap equation to examine electronic, optical, properties of YAuSi, YAuGe, YAuSn half-heusler alloys. The DFT+U approach predicted band gaps 1.2767 eV, 0.611 1.5741 eV for YAUSn, respectively. We also observed that all under consideration a broad absorption spectrum ranging from 1 12 with notable peaks in visible UV...

In this study, we investigated the structural, elastic, electronic, and thermodynamic properties of NbCoSn VRhSn HH compounds using first-principles calculations as implemented in density functional theory (DFT). The computed lattice constants were found to be consistent with available theoretical well experimental data. are mechanically stable since their elastic satisfy Born-Huang criteria for cubic system stability. Due absence imaginary phonons, is dynamically stable, whereas unstable....

Highlights•XGBoost Boosts NRWPS: NDVI and BSI integration improves predictive accuracy.•Comprehensive Monitoring: NRWPS integrates environmental data for land management.•Climate Impacts Vegetation: Post-2000 temperature rise causes loss; rainfall aids recovery.•Land Degradation Effect: Rising BSI, declining indicate soil exposure, vegetation loss.•Sustainability & Resilience: supports adaptation, food security, conservation.AbstractThis study presents the development of models Normalized...

The need for techniques and instruments that enable rapid soil testing has gained attention in the face of climate change environmental degradation. This could improve efficiency productivity by providing real-time, high-quality, accessible data decision-making. study used GPS tools to visualize, analyze, gather essential field information applied Near Infra-Red Spectrometry assess parameters recommend corrective action sustainable livelihood five Counties North Rift Kenya. Soil reaction...

Understanding long-term trends in climatic variables is essential for assessing climate change impacts on regional ecosystems and human livelihoods. A analysis of over some domains inevitable due to their geographical location importance the agricultural sector. Due aforementioned demands, current study analyzes, precipitation (from Climate Hazards Group InfraRed Precipitation with Station data (CHIRPS)), minimum maximum temperatures TerraClimate) North-Rift region Kenya thirty (30) years...

Variations in the radiative characteristics of aerosols can be used to quantify their effects on climate. This study evaluated temporal-spatial variability aerosol at λ = 440 nm, 675 870 nm and 1020 over Nairobi-1°S, 36°E, Mbita-0°S, 34°E Malindi-2°S, 40°E sites Kenya. Aerosol optical properties from AERONET were as inputs Coupled Ocean Atmosphere Radiative Transfer (COART) code model effects. The results Nairobi showed an increase reflectance 2.6%, 6.7%, 7.2% 2.4% for 2006–2007 specified...

Abstract Ceramics are materials with good mechanical properties; however, low fracture toughness, intrinsic brittleness and poor resistance against oxidation at high temperatures challenges limiting their applications. TiB2Mo is a ceramic material whose all elastic properties have not been calculated. In this study, we investigated the elastic, electronic thermal of structure using first principles calculations. All calculations were based on density functional theory as implemented in...

Trend analysis of atmospheric aerosols enhances confidence in the evaluation both direct and indirect effects on regional climate change. To comprehensively achieve this over East Africa, it's important to understand temporal characteristics well selected sites namely Nairobi (1°S, 36°E), Mbita (0°S, 34°E), Mau Forest (0.0°S - 0.6°S; 35.1°E 35.7°E), Malindi (2°S, 40°E), Mount Kilimanjaro (3°S, 37°E) Kampala (0°N, 32.1°E). In context, trend (annual (in Aerosol Optical Depth (AOD) at 550 nm...

Atmospheric aerosols have contributed to radiative forcing through direct and indirect mechanisms. Aerosol effects are important in computing estimates for the past, current future climate. In this study, a comprehensive assessment of regional aerosol forcing, Optical Properties Clouds (OPAC) model (wavelength range 0.25 - 4.0 μm) over selected sites East Africa was done. optical properties constituted inputs Radiative Transfer Model (RTM). Op-tical investigated included Depth (AOD), Single...

Abstract Radiological hazards associated with naturally occurring radionuclides in materials from Rosterman gold mine were assessed by analysis of 30 samples. The gamma-ray spectrometric tailing samples reported an average activity concentration 263 ± 13, 123 6 and 84 4 Bq kg−1 for 40K, 232Th 226Ra, respectively. absorbed dose rate was 124 nGy h−1, while the annual effective 0.4 0.02 mSv y−1 indoor 0.3 0.01 outdoor reported. mean range radiological parameters (external radium equivalent)...

Evaluation of Seasonal Rainfall Pattern as Simulated by the Global Model –Europe over Greater Horn Africa

Atmospheric aerosols are posing a great threat to the already stressed climate with effects being felt more on African continent.Their presence and interaction clouds contribute strongest uncertainty in aerosol characteristics Earth's energy budget hence; calling for long term assessment be done.The present study analyses spatiotemporal microphysical (namely: effective radius ( eff r ) surface-area concentration), using AErosolROboticNETwork (AERONET) framework over Kenyan urban atmosphere...

Thirty samples of tailing waste weighing 200 g were randomly collected from both active and inactive tunnels at the Rosterman gold mine site in western Kenya.The average activity concentration radionuclides ( 40 K, 232 Th 238 U) analyzed by gamma-ray spectrometry was 260 ± 14.29 Bq/Kg for 118 8.25 81 3.63 U.The corresponding radiological parameters all thirty determined specific mean concentrations.The dose rate 54 nGy/h.The radium equivalent value 262 12.04 with a range 154 6.42 to 350...

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Self-Organizing Map (SOM) analysis is used to perform optical characterization of both Aerosol Optical Depth (AOD) and Ångström Exponent (ÅE) retrieved from Moderate-resolution Imaging Spectroradiometer (MODIS) in relation Precipitation Rate (PR) Tropical Rainfall Measurement Mission (TRMM) over selected East African sites 2000 2014 further diagnose climate change the region if any.SOM reveals a marked spatial variability AOD ÅE that associated changing aerosol transport, urban heat islands,...

Since the discovery of high temperature superconductivity (HTSC), there have been varied results concerning pairing energy in unconventional superconductivity.In an attempt to unearth mechanism behind energy, we study a model which excited electron interacts with Cooper pair.The interaction was studied earlier on using second quantization depended wave function.We now use Bogoliubov-Valatini transformation (BVT) that is independent function thermodynamic properties due between and pair...