Assam Don Bosco University Journals
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Design and Development of Patch Textile-Antenna
No full textThe recent advancements show that wireless devices can be developed in a compact form. This miniaturization has led to the demand of an antenna for communication which is small itself and doesn’t compromise on its performance characteristics. An antenna that actually forms a part of clothing without affecting the wearer’s health can prove to be of very useful for Body Area Network (BAN) applications. This suggests the development of an antenna design in microstrip patch form with some specific fabric used as a substrate and who are conducting parts will comprise of conductive material like copper. The antenna can be developed in the ISM band frequency spectrum. Such an antenna can be fabricated in a number of forms using copper tape, conductive fabric or ink. The novelty of the proposed antenna is simple planar configuration, ease in fabrication and very economical. A fabric with suitable dielectric constant and thickness can contribute as a substrate such as pure cotton. Parameters like return loss, and voltage surface wave ratio are used for performance measurement of the design. SAR measurement is also done to ensure that the antenna is safe to be used around human bod
STUDY ON THE HYDROTHERMAL GROWTH OF ZnO NANORODS FOR PIEZOTRONIC APPLICATIONS
Get PDFThe capability of a certain material to generate an electric charge in response to applied mechanical stress is called as piezoelectric Effect. Metal oxidesemiconductors having high piezoelectric coefficient can be cost effectively manufactured by a simple hydrothermal methods at low temperature. These nanostructures are capable of transforming mechanical deformation into electrical power. The nanostructure morphologies and dimensions can be controlled by controlling the growth conditions. When subjected to mechanical deformations, these nanostructures are capable of transforming mechanical deformation into electrical power. Due to the structural noncentralsymmetry,ZnO nanostructures exhibit anisotropic piezoelectric properties. High aspect ratio ZnO nanostructures can be merely designed using hydrothermal methods and these nanowires or nanorods show piezoelectric properties. When subjected to mechanical deformations, these nanostructures undergo a charge separation due to inherent structural asymmetry. Tapping of the separated charges and subsequent accumulation can give a manifestation of mechanical to electrical energy transformation and lead to energy harvesting
ZnO/ZnS core/shell nanostructures based gas sensor for sensing Acetone gas at room temperature
Get PDFIn this paper ZnO/ZnS core/shell nanostructures are used to fabricate the gas sensor which can sense low concentration of acetone gas at room temperature. Due to its reducing properties, acetone gas releases electrons to the surface of the core/shell nanorods. Therefore a sharp increase in conductivity of the sensing material was observed when the sensor was exposed to the acetone gas. The fabricated sensor exhibited excellent sensitivity towards acetone gas at room temperature and is capable of detecting it to a minimum concentration of 10 ppm.  Â
Socio-economic factors Influencing Infant and Child Mortality among the Zou of Manipur
Get PDFThe present study was conducted to find out the influence ofsocio-economic factors on infant and child mortality among the Zou,a tribal population of Manipur. A cross-sectional study was executedamong 533 mothers of age 17- 49 years following house to housevisits from December 2016 to February 2017. The finding showsthere is a significant correlation of the educational level of themother, household income, child immunization to that of infant andchild mortality in the study population
Design and Implementation of Solar Charge Controller for Photovoltaic Systems
Get PDFThe paper presents a design of solar charge controller for PV energy system. A voltage regulator circuit, an Over-charging Protection circuit and an Over-discharging Protection circuit design are proposed in this paper. The voltage regulator circuit modulates the voltage variation at the output of solar panel and fed it to the Charging Controller circuit. The Over-charging controller circuit prevents overcharging of battery and helps to increase lifespan of battery. The Over-discharging circuit protects the battery by restricting flow of current from battery to PV panel. The entire model is implemented in hardware and results are observed and analyzed to examine the capability of the Solar Charge Controlle
Hydraulic and Hydrologic Model Calibration and Validation for an Earthquake-prone Three-Waters Network
Get PDFThis paper summarises the three-waters network (water, wastewater, storm water) model calibration and validation work undertaken in Christchurch after the devastating 2010–2011 earthquakes. The paper outlines some unusual and unique challenges during model calibration due to continual earthquakes in the region and the post-earthquake rebuild work. In case of water supply network model, the validation peak summer date was chosen carefully so that earthquake-related damage and associated rebuild works would have minimal impact on the captured data. The wastewater network was damaged significantly due to the earthquakes. Wastewater flow data were influenced by earthquake damage and post-earthquake major construction activities. Christchurch’s storm water network faced a number of changes – changes in topography, ground levels, river channels and liquefaction – due to the earthquakes. Ongoing model maintenance and updating was a big challenge during model calibration, and an effective collaboration among various teams – GIS, construction contractors, network operations and survey – was important for data collection, data interpretation, model calibration and validation work
MEASUREMENT OF INDOOR RADON AND THORON IN EAST KHASI HILLS DISTRICT OF MEGHALAYA, INDIA
Get PDFIndoor concentrations of radon (222Rn) and thoron (220Rn) were measured (June of 2017 - August of 2017) in sixty (60) houses of three (3) different types (wooden, semi-concrete and concrete) in the selected sites of East Khasi Hill district, Meghalaya, India. Pin-hole based single entrance ²²²Rn/220Rn discriminating dosimeters with LR-115 Type2 films have been used to measure 222Rn and 220Rn concentrations
THEORETICAL STUDY OF THE X2Σ+, A2ΠAND B2Σ+ ELECTRONIC STATES OF CO+ ION USING MRCI METHOD
Get PDFThe ab initio potential energy curves have been calculated for the X2Σ+, A2Πand B2Σ+ states CO+ using the multi-reference configuration interaction method (MRCI) with large active space and basis sets. The potential energy curves calculated for internuclear separations ranges from about 0.8 to 3.7 Angstrom. With the obtained potential energy curves, all of the electronic, vibrational and rotational constants are predicted by numerically solving the radial Schrodinger equation of nuclear motion. The electronic, vibrational, and rotational spectroscopic constants that are obtained after are compared with theoretical and experimental results currently available
Potential of Archimedes Screw Turbine in Rural India Electrification: A Review
Get PDFWith the growing population of India, the demand for energy consumption is increasing. For the overall development of a region, especially remote areas, electricity is of prime importance. Production of electricity in large scale can further lead to various effects like environmental pollution, climate change and it is also costly. Thus the need for a socio-economic energy conversion to electricity is of prime importance for a sustainable development. India has a huge potential in the Hydro to generate 2,50,000 MW. An Archimedes Screw Turbine that was earlier used as a pump can give a very good solution in harnessing water potential. It rotates as water flows through it, rotating the generator's prime mover connected to it. Archimedes Screw turbines operate at a low head of 0.8m to 10 m and relatively lower flow rate than the other turbines and more cost-effective and are highly efficient. The AST is quite a new form of electricity generation practice which has been implemented in different countries along with India. Thus the electrification scenario in rural areas can be improved specially where there is a continuous flow of a river or canal by the installation of the low-cost socio-economic AST
Automatic Climate Control of a Greenhouse: A Review
Get PDFGreenhouse crop production was a very significant event in the history of agriculture since it was realized that with the help of it many plants could be protected from different biotic and abiotic stress. It emerged as a system to protect crops from critical and adverse conditions affecting the growth of plants. The greenhouse is a non-linear system and controlling becomes a difficult task. The parameters affecting the plant growth are temperature, relative humidity, carbon dioxide, nutrition, availability of water and the growing media. The quality and productivity of the crop plants is highly dependent on the management of these parameters. From all the parameters, temperature and humidity are of primary importance to most growers as it is responsible for determining the reaction rates of various metabolic processes involved in the plant growth. In addition, regulating temperature has a direct influence on the relative humidity and carbon dioxide levels of the greenhouse system