Solar still is a very simple solar device used for converting the available brackish or waste water into the potable water. This device can be fabricated easily with available materials. The maintenance is also cheap and no skilled labor is required to make it. This device can be suitable solution to solve drinking water problem. Here comparison is made between the solar still coupled with Flat Plate Collector as well as Passive Solar still. One year study shows that  solar still coupled with Flat Plate collector increases the productivity of solar still of 35 %. Lower the water depth increases the productivity of solar still and solar radiation can also produce considerable effect on productivity.

A lowpass digital filter was designed using the MATLAB toolbox. The programme code was based on the least mean square error criterion method and was run in two steps – viz- filter order estimation from given specifications, and determination of the coefficients of the transfer function using the estimated order and filter specifications. The amplitude response of the linear phase FIR filter was used to obtain a realizable filter transfer function for filter length, N = 40. It was observed that for a longer length the FIR filter has a sharper cut off FIR filter and a narrow transition band. This makes it suitable for processing baseband signals especially digitized voice, music and data signals. All tests were carried out with the aid of the command window, which was unlocked from the workspace desktop for easy accessibility.

Innovations in technologies, economic benefits, quality requirements and environmental concerns are changing the face of the existing power system. Centralized generating facilities are giving way to smaller, more distributed generation partially due to the loss of traditional economies of scale. The need of an intelligent grid, better known as Micro grid at the distribution end, has been recognized to accommodate distributed energy resources (DERs) and renewable energy technologies on large scale. Micro grids can provide improved electric service reliability and better power quality to end customers and can also benefit local utilities by providing dispatch able load for use during peak power conditions or allowing system repairs without effecting customer loads. This paper highlights the concept, benefits and features of Micro Grids. The main technical challenges in the design, operation and control of Micro Grids are briefly outlined that must be overcome for their implementation effectively. The paper also presents a review the researches and activities of Micro Grid technology across the globe. It introduces the current Micro Grid research projects, especially in Europe, United State , Japan , Canada and India .

A model for deterministic perishable items that follows variable type demand rate with infinite time horizon, constant deterioration and without shortages is considered. An optimal production policy is derived with maximization of profit. The result is illustrated with numerical example.

In order to understand the structural behavior, it is useful to study the effects of soil-structure interaction. But usually soil-structure interaction studies are done with the assumption that foundation is fixed to the soil. During strong earthquake motions, uplift in some parts of the foundation may occur depending upon the type of soil which structure is located on. This paper investigates the nonlinear behavior of various steel braced structures placed on different types of soil with varying hardness. This can help in better understanding of the actual behavior of structure during an earthquake. Results showed that for structures allowed to foundation uplift, the softer the soil, the higher will be changes in seismic response.

Fabrication of ingot is first step to produce device solar cell and the second step is fabrication of thin film. This research will be explain only the optic and electric properties of CuGa_0.5In_0.5Se₂ ingot solar cell. A solar cell material has been produced from CuGa_0.5In_0.5Se₂ using the Bridgman method. At the Bridgman Method, solar cell material was heated at maximum temperature 1050^oC and re-cooled until ambience temperature. Heating and cooling process of CuGa_0.5In_0.5Se₂ material took 71 hours. The result is an ingot which was then optically and electrically characterized. Optic characterization utilized XRD (X-ray Diffraction) and XRF (X-ray Fluorescent), whereas electric characterization utilized the four-point and two-point probe. The result of XRD characterization showed that the crystal orientation was [101], [112], [103], [211], [213], [301], [312], [008], and [424]. This crystal orientation was the principal crystal orientation of solar cell material I-III-VI₂. By using the XRD result, the crystal lattice parameter a, c, and c/a can be measured. The structure of this material was chalcopyrite with a c/a ≈ 2 value, whereas other optic characterizations used XRF to measure the material’s % weight composition. Measurement using XRF resulted in the % best weight composition of CuGa_0.5In_0.5Se₂ as follows: Cu: 20.7233%, Ga: 9.1403%, In: 28.8963%, and Se: 41.2401%. Result of electric characterization showed that this material is a type p semi-conductor and its resistivity is 6.280 Ωm.