Spartan Daily, November 29, 1945

Volume 34, Issue 38https://scholarworks.sjsu.edu/spartandaily/3668/thumbnail.jp

Back Cover

Back cover of this issue including instructions to authors

Quaternary Cu2ZnSnSe4 thin films for solar cells applications

Polycrystalline thin films of Cu2ZnSnSe4 (CZTSe) were produced by selenisation of Cu(Zn,Sn) magnetron sputtered metallic precursors for solar cell applications. The p-type CZTSe absorber films were found to crystallize in the stannite structure (a = 5.684 Ã… and c = 11.353 Ã…) with an electronic bandgap of 0.9 eV. Solar cells with the structure were fabricated with device efficiencies up to 3.2%

W-band waveguide-packaged InP HEMT reflection grid amplifier

This letter presents a 79-GHz broadband reflection-type grid amplifier using spatial power combining to combine the power of 64 unit cells. Each unit cell uses a two-stage cascade configuration with InP HEMTs arranged as a differential pair. A broadband orthogonal mode transducer (OMT) separates two orthogonally polarized input and output signals over a 75 to 85GHz range. In conjunction with the OMT, a mode converter with quadruple-ridged apertures was designed to enhance the field uniformity over the active grid. Measurements show 5-dB small signal gain at 79GHz and an 800-MHz 3-dB bandwidth. The amplifier generates an output power of 264mW with little evidence of saturation

Development of an improved method for soil and water conservation planning at catchment scale in the East African Higlands : Progress Report 1 jan - 30 sep 2002

The overall goal of the EROAHI Project is to improve the Catchment Approach, a methodology for participatory soil conservation planning currently applied in the East African Highlands Eco-region. Anticipated improvements are: semi-quantification of soil and productivity loss using farmers’ knowledge, simple ex ante economic cost-benefit analysis of proposed scenarios and moving up the SWC planning from farm level to catchment scale. The project goal is to be achieved by realising the following objectives (EROAHI Management Document 1, 2000): To develop field-scale indicators of erosion and sedimentation based on indigenous knowledge of soil and vegetation characteristics; 1. To attach quantitative values of erosion, sedimentation and/or productivity to the developed indicators, based on field scale measurements; 2. To quantify erosion, sedimentation and soil productivity at catchment scale using the developed indicators and compare the estimates with a detailed model study to develop simple 'rules of thumb' for erosion assessment; 3. To develop a methodology for economic impact assessment of planned soil and water conservation measures at farm level; 4. To further develop a specific methodology for catchment scale soil and water conservation planning in the East African Highlands using a participatory approach