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Condition assessment of fire affected reinforced concrete shear wall building - A case study
Mistri, Abhijit,Pa, Robin Davis,Sarkar, Pradip Techno-Press 2016 Advances in concrete construction Vol.4 No.2
The post - fire investigation is conducted on a fire-affected reinforced concrete shear wall building to ascertain the level of its strength degradation due to the fire incident. Fire incident took place in a three-storey building made of reinforced concrete shear wall and roof with operating floors made of steel beams and chequered plates. The usage of the building is to handle explosives. Elevated temperature during the fire is estimated to be $350^{\circ}C$ based on visual inspection. Destructive (core extraction) and non-destructive (rebound hammer and ultrasonic pulse velocity) tests are conducted to evaluate the concrete strength. X-ray diffraction (XRD) and Field Emission Scanning Electron Microscopy (FESEM) are used for analyzing micro structural changes of the concrete due to fire. Tests are conducted for concrete walls and roof slab on both burnt and unburnt locations. The analysis of test results reveals no significant degradation of the building after the fire which signifies that the structure can be used with full expectancy of performance for the remaining service life. This document can be used as a reference for future forensic investigations of similar fire affected concrete structures.
Application of Analytic Hierarchy Process for the Selection of Cotton Fibers
Majumdar Abhijit,Sarkar Bijan,Majumdar Prabal Kumar The Korean Fiber Society 2004 Fibers and polymers Vol.5 No.4
In many engineering applications, the final decision is based on the evaluation of a number of alternatives in terms of a number of criteria. This problem may become very intricate when the selection criteria are expressed in terms of different units or the pertinent data are difficult to be quantified. The Analytic Hierarchy Process (AHP) is an effective way in dealing with such kind of complicated problems. Cotton fiber is selected or graded, in the spinning industries, based on several quality criteria. However, the existing selection or grading method based on Fiber quality Index (FqI) is rather crude and ambiguous. This paper presents a novel approach of cotton fiber selection using the AHP methodology of Multi Criteria Decision Making.
Three-echelon sustainable supply chain model with cost fuzzification
Biswajit Sarkar,Abhijit Debnath 대한산업공학회 2021 대한산업공학회 춘계학술대회논문집 Vol.2021 No.6
The present study deals with the modeling of a sustainable supply chain where the objective is fixed to reduce the carbon emission control the production process so that the defective items generate at a low rate. This model comprises a single supplier, single manufacturer, and multiple retailers. Setup cost investment is incorporated, and the defective cost is shown for the defective items in the manufacturer section. Except for the setup cost and the holding cost, all costs are being fuzzified, and then and special algebraic method is taken to optimize the total cost of the supply chain. A numerical example is also done to show the inevitability of the model. Moreover, a lemma is formed to validate the global optimality of the result. In this study, the retailer maintains the exact order so that the excess holding cost could be reduced. Some recommendations are done for further extension of this study.
Comparative analysis of seed transcriptomes of ambient ozone-fumigated 2 different rice cultivars
Cho, Kyoungwon,Shibato, Junko,Kubo, Akihiro,Kohno, Yoshihisa,Satoh, Kouji,Kikuchi, Shoshi,Sarkar, Abhijit,Agrawal, Ganesh Kumar,Rakwal, Randeep Informa UK (Taylor Francis) 2013 Plant signaling & behavior Vol.8 No.11
Cho, Kyoungwon,Shibato, Junko,Kubo, Akihiro,Kohno, Yoshihisa,Satoh, Kouji,Kikuchi, Shoshi,Agrawal, Ganesh Kumar,Sarkar, Abhijit,Rakwal, Randeep Kluwer Academic Publishers 2013 Biotechnology letters. Vol.35 No.4
<P>The 'ozone (O3)-responsive transcriptome' behavior in the panicles and grains of rice plant was studied individually through high-throughput oligo-DNA microarray technique. O3 differentially and separately regulated 620 and 130 genes in the panicles and grains. Among the O3-responsive genes, 176 and 444 genes were up- and down-regulated in panicle compared to 24 and 106 genes in grain, respectively. Further mapping revealed that the majority of differentially expressed genes were mainly involved in signaling, hormonal, cell wall, transcription, proteolysis, and defense events. Many previously unknown O3-responsive novel genes were identified. Inventory of 745 O3-responsive genes and their mapping will expand our knowledge on novel regulatory processes in both panicles and grains of rice; and, serve as a resource towards the designing of rice crops for future high-O3world.</P>
Md Najmus Saadat,Sujit Das,Senjuti Nandy,Divya Pandey,Monojit Chakraborty,Usha Mina,Abhijit Sarkar 대한공간정보학회 2022 Spatial Information Research Vol.30 No.2
Air pollution is a serious concern with the developing economics in India and gets more severe when it has major cities ranked among the top 30 polluted cities worldwide. To find a solution, different programs and/or policies have been launched for air quality management country-wide. Unfortunately, no such plan could effectively solve the purpose rather than an unexpected COVID- 19 pandemic situation in India. Our study focused on the air pollution status and air quality index (AQI) in 42 cities (that includes 6 metros) representing North, South, East, West, Central, and North-East region of India during the pre-lockdown, four lockdowns and unlock phases. The results depict most of the pollutants except ozone (O3) were significantly reduced in the lockdown-1, and marginally increased in subsequent lockdown phases. Regarding the average AQI, its value was highest in North Indian cities (227), followed by East India (172), Central India (141), North-East India (130), West India (124), and South India (83) during the pre-lockdown. Due to COVID- 19 induced lockdown, North Indian cities observed the highest dip in average AQI (108), followed by Central India (113), East India (82), West India (73), South India (55), and North-East India (49) in the lockdown and unlock phases. Thus, the study gave a conspicuous vision on mitigation of air pollution under this pandemic; and, if strategic centralized policies are sensibly implemented and by involving the participation of people of India, then there is a feasibility of air pollution issue management.
Anamika Roy,Mamun Mandal,Sujit Das,Manoj Kumar,Robert Popek,Amit Awasthi,Balendu Shekher Giri,Kartick Chandra Mondal,Abhijit Sarkar 대한환경공학회 2023 Environmental Engineering Research Vol.29 No.3
Recent regulations on exhaust emissions have led to an increase in non-exhaust emissions, which now surpasses exhaust emissions. Non-exhaust emissions are mainly generated from brake and tire particle abrasion, road wear, and re-suspended road dust. In Asia, non-exhaust emissions have increased significantly over the past 50 years, resulting in almost 92% of the population breathing polluted air, which accounts for 70% of air pollution related-deaths. Most Asian countries with poor air quality are developing or underdeveloped. Taking this into consideration, the current study aims to shed light on particulate pollution from non-exhaust emissions in the Asian context to assess the current status and its health consequences and provides technological solutions. The study is based on an in-depth analysis of existing reviews and research concerning non-exhaust emissions and their health impacts in Asia to pinpoint knowledge gaps. The study found that particulate pollutants had exceeded WHOs standards in many Asian countries, bringing deleterious health consequences among children and the elderly. The findings underscore the significance of future researchers efforts to devise solutions that curtail non-exhaust emissions, ultimately reducing air pollution, augmenting air quality, fostering better health outcomes, and paving way for a more sustainable future before it is too late.