DSpace Collection:http://localhost:8081/xmlui/handle/123456789/1252024-01-19T11:33:48Z2024-01-19T11:33:48ZPERFORMANCE EVALUATION OF SALIA IRRIGATION PROJECT IN CHANGING CLIMATESethi, Rabindranathhttp://localhost:8081/xmlui/handle/123456789/154352022-06-03T07:25:14Z2013-06-01T00:00:00ZTitle: PERFORMANCE EVALUATION OF SALIA IRRIGATION PROJECT IN CHANGING CLIMATE
Authors: Sethi, Rabindranath
Abstract: Under climate change conditions, many water systems are projected to be less reliable
and more vulnerable in meeting users' demands, exacerbating existing competition for
water resources. At the global scale, water demand will grow in the next decades due
to population growth, and substantial changes in irrigation water demand due to
impact of climate change. National Water Mission was set up by Govt. of India
recommended to study impact of climate change on water resources. The present
research work aims at evaluating performance of reservoir by implementing
hydrological model with climate change implication to optimize the efficiency of
existing irrigation systems, expand irrigation, where feasible, with a special effort to
increase storage capacity. In the current study, performance of Salia reservoir in
Odisha is analyzed under climate change conditions.
The thesis is focused on the following heuristics: (I) trend analysis for identification of
temporal changes in hydrological parameters such as precipitation and inflows time
series due to potential impacts of climate change, (ii) quantification of inflows to
reservoir using ARNO model with changing climate, and (iii) reservoir performance
evaluation using WEAP model and scenarios development.
From the trend analysis using Mann-Kendall test, no significant trend noticed for
annual, seasonal and for any monthly rainfall. Variation of precipitation shows that
number of rainy days is decreasing and number of intense rainy days (more than 100
mm) is increasing. As a result flash floods and dry spells are creating havoc. A
significant rising trend with the test statistic value of +3.18 is observed for daily inflow
series at 95% confidence level. ARNO result shows that the simulated flow
increase/decrease is directly proportional to the change in the rainfall decrease/increase.
It is observed that, a change of 25% decrease or increase in rainfall amount resulted in
equal amount of decrease or increase in the inflow. The performance of WEAP model
shows that if inflows reduced by 20% there would be a decrease in supply reliability,
and it would not be possible to increase supplies. Reducing live storage by 10%
* influence supply delivered in May and June, but again has little impact on the rest of the
year.2013-06-01T00:00:00ZDSS (DECISION SUPPORT SYSTEM) FOR URBAN WATER MANAGEMENT WITH CLIMATE CONSIDERATIONKumar, Praveenhttp://localhost:8081/xmlui/handle/123456789/153942022-04-26T07:31:56Z2013-05-01T00:00:00ZTitle: DSS (DECISION SUPPORT SYSTEM) FOR URBAN WATER MANAGEMENT WITH CLIMATE CONSIDERATION
Authors: Kumar, Praveen
Abstract: To find out the water demand and problems in supplying that in the near future is a big problem, as in the urban areas like Dehradun, which is a decade old state capital, the change in Landuse/ Landcover pattern has been very rapid. The built up area is increasing day by day which is effecting the hydrological cycle of the district. Change in climate is also becoming a major factor to effect the hydrological cycle of the district. In the present study a scientific approach is used to propose the coming problems regarding water in the city and probable places where it will most likely to happen in the city. Different thematic layers required to study the city and nearby area of the city, such as landuse/ landcover, past and present population density, have been prepared in a Geographic Information System enviroment using high resolution digital data of LAN DSAT satellite amalgamated with field data. By studying these maps one can propose the high water demand area in the near future by considering some factors, such as distance from the city, topographic slopes, landuse/lancover, present population density, existing water supply etc. Population of the city is also forecasted as per last three decades census data to have an idea of the demand of water in the near future and problems which will arise to compete that challenge. In addition a trend is made using the precipitation and temperature data of 1901 to 2002 years data from indian Meteorological Department(IMD). Auto Regressive Integrated Moving Average(ARIMA) model is used to predict a trend between precipitation and temperature with graphical approach and analytical approach both. To assemble all the data at one place and to make it easy to use, Visual Basic 6.0 is used to make a model which is an user friendly platform. Analytical data, graphical data of precipitation and temperature, thematic maps, forecasted population and demand data is placed in the model so that one can see all the things at one place to make out decision regarding the future water problems2013-05-01T00:00:00ZEXPERIMENTAL STUDY ON EFFECT OF MODERN METHODS FOR DEWAXING CERAMIC SHELL FOR INVESTMENT CASTING PROCESSRani, Dolihttp://localhost:8081/xmlui/handle/123456789/153932022-04-26T07:28:47Z2013-06-01T00:00:00ZTitle: EXPERIMENTAL STUDY ON EFFECT OF MODERN METHODS FOR DEWAXING CERAMIC SHELL FOR INVESTMENT CASTING PROCESS
Authors: Rani, Doli
Abstract: investment casting is the process well known for achieving excellent finishing of surface,
accuracy of dimensions and intricate shapes development. The process parameters behind the
preparation of wax blends and ceramic slurry make the investment casting process laborious
and troublesome. Due to the thermal expansion, shrinkage of material of pattern, material of
mould and solidification of alloy being casted, there are changes that occur between pattern
and its corresponding part of casting. Composition of the wax plays a vital role to optimization
of the expansion, shrinkage and maximization of hardness of pattern. The ceramic slurry,
composition also plays an important role to improve and stabilize the ceramic slurry. The most
crucial step in investment casting is the 'dewaxing' of investment shells. It describes the
nature of casting because the surface and dimensional traits of the wax are transferred to the
shell of ceramic and it leads to the final stage of casting. In the present work, experiments
were conducted with different type of waxes namely paraffin wax, microcrystalline wax and
carnauba wax, varying their proportion.
The dewaxing of wax from shell was done in microwave and infrared ovens. Using the data
obtained from the experiments an attempt has been made to find out the set of input
parameters, which could offer a set of ideal properties of wax blend and ceramic slurry.
Taguchi method was used to optimize the process parameters. The Orthogonal Array which
represents the matrix of number of parameters those are to be varied gives the number of tests
to be conducted. Taguchi method has successfully suggested the set of input parameters which
could offer the desired properties. The changes in properties like linear shrinkage, volumetric
shrinkage, surface roughness and hardness have been calculated by dewaxing the shell in
microwave and infrared ovens2013-06-01T00:00:00ZCONVERTOR-BASED SPEED CONTROL OF DOUBLY FED INDUCTION MACHINESingh, Jayveerhttp://localhost:8081/xmlui/handle/123456789/153922022-04-26T07:23:32Z2013-06-01T00:00:00ZTitle: CONVERTOR-BASED SPEED CONTROL OF DOUBLY FED INDUCTION MACHINE
Authors: Singh, Jayveer
Abstract: The electric motor applications are increasing speedily with advancement in technology. With the technological progress the adjustable speed drives are preferred. So speed control of electric motors is always a challenge for researchers and technologists. In this thesis the speed control with the help of power electronic converter has been studied. The present thesis based on 1) mathematical modeling of doubly fed induction machine (DFIM) ii) rotor resistance controlled DFIM drive and variation of rotor resistance with the help of rectifier and chopper iii) variation of voltage and frequency on stator and rotor side iv) implementation of constant volts/hertz control v) implementation of vector control vi) simulation of drives with matlab simulink. To use the electrical energy efficiently doubly fed induction machine (DFIM) with the help of power electronics converter are widely used with voltage-controlled voltage source inverters for industrial, traction, large capacity pumps, and wind energy systems, flywheel energy storage applications, because of their high power density, flexibility, smaller speed limitation, part load operation, good transient response and high efficiency. As a first step towards the objective of this thesis, the speed control by inserting the external tv resistance in the rotor circuit has been studied. With this method having disadvantages like additional ohmic loss in rotor circuit hence reduced efficiency of the machine and also the loss of energy. If a step has taken to increase or decrease the frequency, flux try to increase or decrease, haveving constant flux machines converter based constant volts/hertz control for keeping flux constant has been implemented at rotor side of doubly fed induction machine (DFIM) for operation below synchronous speed. For high speed operation i.e the operation above synchronous speed the vector control scheme has been implemented due to some advantageous features like quicker system response, good transient response. Constant volts/hertz cannot be applied for operation above rated speed because we cannot increase the voltage above the rated value also scalar control system is a sluggish system due to inherent system coupling. Sinusoidal pulse width modulation (SPWM) has been implemented to generate gate signals for the inverter. The simulation study has been carried out for the drives in below synchronous speed operation, above synchronous speed operation with load variation.2013-06-01T00:00:00Z