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Ambarish Sharan Vidyarthi,Yuvraj,Jeeoot Singh 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.8
Low cell density is a major bottleneck in any microalgal bioprocess that prevents the large scale exploitation of this potential bioresource from commercialization of commodities like biofuels. Control of factors limiting growth is the key to enhancing cell density. Factors limiting photoautotrophic growth of C. vulgaris were identified and controlled to a possible extent. Limiting CO2-transfer rate, light attenuation, scarcity of nutrients, and high pH compounded to retard growth gradually in the basal medium. Analysis of the maximum feasible CO2 mass-transfer rate and CO2 fixation rates enabled the assessment of CO2-limited growth without on-line estimation of dissolved CO2. Growth (1.4×108 cells mL−1, 12.6 g dry wt L−1) was extensively enhanced when limiting factors were staved in a customized 250mL stirred-tank photobioreactor. Scaling the culture 8 times with constant kLa (volumetric mass-transfer coefficient) and Rei (impeller Reynolds number) resulted in reduction of biomass titer by 80% because of light attenuation.
Ambarish Datta,Bijan Kumar Mandal 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.4
A numerical simulation has been conducted in this study to evaluate the effect of methanol addition to the blend of diesel and palm streain biodiesel. Also the effect of diesel-palm streain biodiesel blend has been considered and compared to that of baseline fuel, diesel and palm biodiesel. A commercial software Diesel-RK has been used in this study to simulate a single cylinder, naturally aspirated, direct injection, four stroke diesel engine. The results indicate that except a minor increase in the brake specific fuel consumption, the entire performance and emission characteristics with methanol blended diesel-biodiesel blends are much better than that of diesel. The dieselbiodiesel blend also shows better emission characteristics than that of diesel except NO x emission.
Ambarish Datta,Samiddha Palit,Bijan Kumar Mandal 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.5
The performance and emission characteristics of a compression ignition engine using mixture of jatropha biodiesel and mineral dieselhave been experimentally investigated. It is observed that brake specific fuel consumption increases with higher percentage of biodieselin the blends. Brake thermal efficiency decreases with the increased percentage of biodiesel in the blends. The maximum efficiency isfound to be 29.6% with pure diesel and 21.2% with pure biodiesel. Carbon mono-oxide and hydrocarbon emissions are improved withthe addition of biodiesel to diesel. NOx emission is found to be increased with pure biodiesel by 24% compared to mineral diesel.
Swapan Kumar Bagui,Ambarish Ghosh 대한토목학회 2012 KSCE JOURNAL OF CIVIL ENGINEERING Vol.16 No.7
Drivers of vehicles are facing problem to drive due to the glare of head light of the opposite vehicle. This reduces the speed of vehicle during night driving for the case of not providing anti glare screen barrier on the median of the divided carriageway. This speed can be increased by providing anti glare screen barrier on the median of divided carriageway. Different values of Vehicle Operating Cost (VOC) have been found for both the cases. The values of VOC savings 40% and 15% are recommended as toll tariff for commercial and passenger/bus vehicle respectively. Financial analysis has been carried out using toll rate calculated from VOC savings. Toll revenue has been determined considering effects of local traffic, leakage of traffic and toll exempted traffic. These toll rates are used to carry out financial analysis to determine optimal debt capacity ratio. This paper presents the development of a model to determine the optimal debt equity ratio based on equal and variable repayment schedule as well as proposing equal and variable depreciation and identify best model for using equity holder. The model is the combination of a financial model and a linear programming model that incorporates an objective of maximizing the return of the project from the equity holder’s point of view and identify best method of repayment schedule from promoter point of view. Equal installment schedule with Written Down Value i. e.,variable Depreciation Method is the best method which maximizes return on equity. To show the versatility of the model, a real case study has also been presented herein.
Traffic and Revenue Forecast at Risk for a BOT Road Project
Swapan Kumar Bagui,Ambarish Ghosh 대한토목학회 2012 KSCE Journal of Civil Engineering Vol.16 No.6
This paper presents the risk analysis of revenue and traffic forecast of a Build Operate Transfer (BOT) road project using cumulative distribution method. In road project, traffic is the main source to earn money/revenue. Traffic is projected using various methods. Actual traffic may not follow the projected traffic and actual traffic may be reduced/increased depending on the development of the road side and near areas. Rapid development i.e., industrial, commercial, business activity creates rapid traffic growth rate which is not expected and reverse happening where road side development is negligible. Traditional traffic forecast may not consider the risk of projected traffic. This paper presents the risk analysis of the projected traffic and alternatively revenue with a real case study and determine lower and upper limit of revenue and expected revenue has been determined using Monte Carlo Simulation Method.
In Vitro Propagation of Trichosanthus Dioica Roxb. for Nutritional Security
Satyajit Saurabh,Dinesh Prasad,Ambarish S. Vidyarthi 한국작물학회 2017 Journal of crop science and biotechnology Vol.20 No.2
The pointed gourd (Trichosanthes dioica Roxb.) is an important cucurbit reported for its medicinal value, therapeutic potential, and as a popular delicacy (especially in Indian cuisine). Being nutritive and desirous, it has potential to feed the nations and addresses their nutritional security and economic prosperity. The plant is usually vegetatively propagated and cultivated for fruits during summer and rainy seasons. The limited supply of planting material, limits cultivation and production. The present study was in anticipation for direct organogenesis, callus induction, and somatic embryo formation from leaf and node explants of T. dioica Roxb. In this study, the MS medium supplemented with 0.5 mg/L BA and 0.5 mg/L 2,4-D was found to be most efficient for callus induction, followed by 0.5 mg/L Kn and 0.5 mg/L 2,4-D. The embryogenic callus was developed by sub-culturing of node callus in the same media. The scanning electron microscopic (SEM) analysis revealed the presence of embryogenic cell clusters having globular embryos, which were found irresponsive to develop further. Through direct organogenesis, the node explants have responded to produce true-to-type plants for propagation. It was observed that MS supplemented with 1.0 mg/L BA was efficient for shoot proliferation, and 0.5 mg/L IAA was found more efficient for root development. Notably, the plant remains unexplored in its potential for improvement involving molecular breeding and tissue culture. These results may be effective to produce genetically stable plants on a large scale and aid the genetic improvement of pointed gourds.