Ajay Singh Jethoo | Malaviya National Institute of Technology, Jaipur (original) (raw)
Uploads
Papers by Ajay Singh Jethoo
International Journal on Environmental Sciences, 2011
In the last few years, the ground water level in Rajasthan is going down rapidly. Due to intense ... more In the last few years, the ground water level in Rajasthan is going down rapidly. Due to intense heat, the dams are drying up resulting in severe water crisis particularly in city like Jaipur where drinking water supply solely depends upon ground water and dams. Major dams like Ramgarh and Bisalpur from where Jaipur city is getting water, have hardly any water left. The population of capital city Jaipur is rising at an alarming rate resulting in huge demand of water. It is high time to review the policy of drinking water supply especially for Jaipur city. During present study, efforts have been made to motivate the residents for conserving the water by of fering some lucrative incentives to them. The incentive given to users shall be linked with amount of water saved. Further, efforts have been made by conducting door to door survey to frame a policy for granting number of water connection per household.
Due to rapid increase in industrialisation, exponential growth of internal combustion engines, co... more Due to rapid increase in industrialisation, exponential growth of internal combustion engines, continuous deteriorating environment have paved the way to make renewable energy resources more attractive. The most feasible way to meet this growing demand is by utilizing alternative fuels such as Jatropha which have been considered as a prospective feedstock for biodiesel production in a number of hot and humid climatic countries. It has approximately same combustion characteristics and heat value as diesel fuel and has proved better environmental friendliness as compared to diesel and gasoline. Jatropha curcas is a drought resistant perennial, growing well even in poor soil conditions. It is easy to establish, grows relatively quickly and survives, producing seeds for 50 years containing oil up to 37%. During present study, efforts have been made to study the suitability of Jatropha plantation in Rajasthan with respect to its climate suitability, financial viability and possible emplo...
International Journal of Environmental Science and Development, 2011
In a dual fuel engine, two fuels are used simultaneously. The primary fuel is usually gaseous for... more In a dual fuel engine, two fuels are used simultaneously. The primary fuel is usually gaseous forms the major content of the total energy supplied to the engine. The secondary fuel, i.e., pilot fuel, is injected after compression of the primary fuel air mixture. Much of the energy release comes from the combustion of the gaseous fuel and a small amount of diesel fuel provides ignition through timed cylinder injection. In the present work, single-cylinder, compression ignition, direct injection diesel engine has been used for the investigations of exhaust emissions when the engine is operating as a dual-fuel engine using diesel as pilot fuel and Liquefied Petroleum Gas (LPG) as secondary fuel. The influence of major engine operating parameters, such as the pilot fuel quantity, intake air temperature, Exhaust Gas Recirculation (EGR), intake air throttling and rate of injection on the exhaust emissions was investigated. Diesel fuel was used as the pilot fuel, while LPG was used as the main fuel which was inducted in the intake manifold. The experimental investigations showed that the poor exhaust emissions at light loads can be improved by employing larger pilot fuel quantity, using EGR, increasing intake temperature and well adjusted rate of injection.
Failure Mode And Effect Analysis (FMEA) is a technique to identify and prioritize potential failu... more Failure Mode And Effect Analysis (FMEA) is a technique to identify and prioritize potential failures of a process. This paper reports the description of FMEA methodology & its implementation in a foundry. It is used as a tool to assure products quality & as a mean to improve operational performance of the process. The work was developed in an Indian foundry, in cooperation with part of the internal staff chosen as FMEA team members & was focused on the study of core making process. The problems identified in the various steps of core making process contributing for high rejection are studied & analyzed in terms of RPN to prioritize the attention for each of the problem. The monetary loss due to core rejection is considered as measure of risk.
International Research Journal on Advanced Science Hub
The fire resistance of concrete with low fire resistance and meagre fire resistance can be improv... more The fire resistance of concrete with low fire resistance and meagre fire resistance can be improved by replacing the cement in the concrete mixture with different GGBS ratios. By partially substituting cement with GGBS (ground blast furnace slag), which can be used as an additive to assure excellent heat resistance in concrete, the GGBS can help lower the price of concrete mixtures, prevent concrete from cracking, reduce high temperatures and increase compressive strength. For OPC concrete mixtures, the exact optimal cement substitution rate of GGBS (15-60%, in steps of 15%) must be reached for mechanical (compressive strength, tensile strength and flexural strength) analysis, durability (constant pressure and water absorption), GGBS concrete mixture mass loss due to acid attack and microstructure characteristics (FESEM and FTIR), assuming a water-cement ratio of 0.4. (Mixture 1 with 100% and Mixture 2 with the best GGBS percentage) After exposure to the flame, the resistance is calculated. Curing HSC performance is observed under the influence of thermal annealing. Higher temperature is observed in various mixtures and densities.
International Research Journal on Advanced Science Hub
In the past few decades, the impact of explosions on buildings has been the area of research, mai... more In the past few decades, the impact of explosions on buildings has been the area of research, mainly because buildings worldwide are increasingly facing the risk of deliberate explosion attacks, accidental explosions, and other forms of related explosion failure. The magnitude of the explosive load generated by most explosions is much higher than the design load of conventional structural engineering. As a result, with the intensification of global terrorist attacks, building owners, government departments, and design professionals have become more aware of the vulnerability and survivability of structures to explosive loads. Although much work on the impact of explosions on infrastructure continues, especially in India, numerical work to test explosives has been restricted. In addition, there are few computational tests for reinforced concrete beam-column joint to withstand explosive loads within a close range with a ruler spacing of less than as mentioned in IS: 1449. This may be due to the unreliable accuracy and relatively low survivability of most tools in this area.
Key Engineering Materials
The mechanical and durability properties were best at 45% GGBS and 5% Waste Glass with 0.4 water/... more The mechanical and durability properties were best at 45% GGBS and 5% Waste Glass with 0.4 water/cement ratio. The recycled materials implemented for mix proportion were waste glass provided considerably to enhance its properties when added with GGBS. In most of the research work, the effect of WG and GGBS in concrete as a partial substitution of fine aggregate and cement individually is analyzed. Previous studies only show the individual impact of these concrete recycled materials on mechanical and durability properties. In the present study, an exact optimum substitution level of cement by GGBS (15 – 60% at an increment of 15%) and fine aggregate by the waste glass (5 – 20% at an increase of 5%) combined for OPC concrete mix. Mechanical (compressive strength, split tensile strength and flexural strength) and microstructural properties (FESEM) were observed on the combination of waste glass and GGBS concrete mix.
International Journal on Environmental Sciences, 2011
In the last few years, the ground water level in Rajasthan is going down rapidly. Due to intense ... more In the last few years, the ground water level in Rajasthan is going down rapidly. Due to intense heat, the dams are drying up resulting in severe water crisis particularly in city like Jaipur where drinking water supply solely depends upon ground water and dams. Major dams like Ramgarh and Bisalpur from where Jaipur city is getting water, have hardly any water left. The population of capital city Jaipur is rising at an alarming rate resulting in huge demand of water. It is high time to review the policy of drinking water supply especially for Jaipur city. During present study, efforts have been made to motivate the residents for conserving the water by of fering some lucrative incentives to them. The incentive given to users shall be linked with amount of water saved. Further, efforts have been made by conducting door to door survey to frame a policy for granting number of water connection per household.
Due to rapid increase in industrialisation, exponential growth of internal combustion engines, co... more Due to rapid increase in industrialisation, exponential growth of internal combustion engines, continuous deteriorating environment have paved the way to make renewable energy resources more attractive. The most feasible way to meet this growing demand is by utilizing alternative fuels such as Jatropha which have been considered as a prospective feedstock for biodiesel production in a number of hot and humid climatic countries. It has approximately same combustion characteristics and heat value as diesel fuel and has proved better environmental friendliness as compared to diesel and gasoline. Jatropha curcas is a drought resistant perennial, growing well even in poor soil conditions. It is easy to establish, grows relatively quickly and survives, producing seeds for 50 years containing oil up to 37%. During present study, efforts have been made to study the suitability of Jatropha plantation in Rajasthan with respect to its climate suitability, financial viability and possible emplo...
International Journal of Environmental Science and Development, 2011
In a dual fuel engine, two fuels are used simultaneously. The primary fuel is usually gaseous for... more In a dual fuel engine, two fuels are used simultaneously. The primary fuel is usually gaseous forms the major content of the total energy supplied to the engine. The secondary fuel, i.e., pilot fuel, is injected after compression of the primary fuel air mixture. Much of the energy release comes from the combustion of the gaseous fuel and a small amount of diesel fuel provides ignition through timed cylinder injection. In the present work, single-cylinder, compression ignition, direct injection diesel engine has been used for the investigations of exhaust emissions when the engine is operating as a dual-fuel engine using diesel as pilot fuel and Liquefied Petroleum Gas (LPG) as secondary fuel. The influence of major engine operating parameters, such as the pilot fuel quantity, intake air temperature, Exhaust Gas Recirculation (EGR), intake air throttling and rate of injection on the exhaust emissions was investigated. Diesel fuel was used as the pilot fuel, while LPG was used as the main fuel which was inducted in the intake manifold. The experimental investigations showed that the poor exhaust emissions at light loads can be improved by employing larger pilot fuel quantity, using EGR, increasing intake temperature and well adjusted rate of injection.
Failure Mode And Effect Analysis (FMEA) is a technique to identify and prioritize potential failu... more Failure Mode And Effect Analysis (FMEA) is a technique to identify and prioritize potential failures of a process. This paper reports the description of FMEA methodology & its implementation in a foundry. It is used as a tool to assure products quality & as a mean to improve operational performance of the process. The work was developed in an Indian foundry, in cooperation with part of the internal staff chosen as FMEA team members & was focused on the study of core making process. The problems identified in the various steps of core making process contributing for high rejection are studied & analyzed in terms of RPN to prioritize the attention for each of the problem. The monetary loss due to core rejection is considered as measure of risk.
International Research Journal on Advanced Science Hub
The fire resistance of concrete with low fire resistance and meagre fire resistance can be improv... more The fire resistance of concrete with low fire resistance and meagre fire resistance can be improved by replacing the cement in the concrete mixture with different GGBS ratios. By partially substituting cement with GGBS (ground blast furnace slag), which can be used as an additive to assure excellent heat resistance in concrete, the GGBS can help lower the price of concrete mixtures, prevent concrete from cracking, reduce high temperatures and increase compressive strength. For OPC concrete mixtures, the exact optimal cement substitution rate of GGBS (15-60%, in steps of 15%) must be reached for mechanical (compressive strength, tensile strength and flexural strength) analysis, durability (constant pressure and water absorption), GGBS concrete mixture mass loss due to acid attack and microstructure characteristics (FESEM and FTIR), assuming a water-cement ratio of 0.4. (Mixture 1 with 100% and Mixture 2 with the best GGBS percentage) After exposure to the flame, the resistance is calculated. Curing HSC performance is observed under the influence of thermal annealing. Higher temperature is observed in various mixtures and densities.
International Research Journal on Advanced Science Hub
In the past few decades, the impact of explosions on buildings has been the area of research, mai... more In the past few decades, the impact of explosions on buildings has been the area of research, mainly because buildings worldwide are increasingly facing the risk of deliberate explosion attacks, accidental explosions, and other forms of related explosion failure. The magnitude of the explosive load generated by most explosions is much higher than the design load of conventional structural engineering. As a result, with the intensification of global terrorist attacks, building owners, government departments, and design professionals have become more aware of the vulnerability and survivability of structures to explosive loads. Although much work on the impact of explosions on infrastructure continues, especially in India, numerical work to test explosives has been restricted. In addition, there are few computational tests for reinforced concrete beam-column joint to withstand explosive loads within a close range with a ruler spacing of less than as mentioned in IS: 1449. This may be due to the unreliable accuracy and relatively low survivability of most tools in this area.
Key Engineering Materials
The mechanical and durability properties were best at 45% GGBS and 5% Waste Glass with 0.4 water/... more The mechanical and durability properties were best at 45% GGBS and 5% Waste Glass with 0.4 water/cement ratio. The recycled materials implemented for mix proportion were waste glass provided considerably to enhance its properties when added with GGBS. In most of the research work, the effect of WG and GGBS in concrete as a partial substitution of fine aggregate and cement individually is analyzed. Previous studies only show the individual impact of these concrete recycled materials on mechanical and durability properties. In the present study, an exact optimum substitution level of cement by GGBS (15 – 60% at an increment of 15%) and fine aggregate by the waste glass (5 – 20% at an increase of 5%) combined for OPC concrete mix. Mechanical (compressive strength, split tensile strength and flexural strength) and microstructural properties (FESEM) were observed on the combination of waste glass and GGBS concrete mix.