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| 1 | Nitration of Jharia basin coals,India:a study of structural modifications by XRD and FTIR techniques显示文摘Four coal samples from Jharia basin,India are treated with nitric acid in glacial acetic acid and aqueous media to find out the chemical,petrographic and spatial structure of the organic mass by X-ray diffraction(XRD)and Fourier Transform Infrared Spectroscopy(FTIR)techniques.X-ray parameters of coal like interlayer spacing(d_(002)),crystallite size(L_(c)),aroamticity(f_(a)),average number of aromatic layers(N_(c)),and coal rank(I_(26)/I_(20))have been determined using profilefitting software.Considerable variation is observed in treated coals in comparison to the demineralized coals.The d_(002)values of treated coals have increased in both the media showing increase in disordering of organic moieties.A linear relationship has been observed between d_(002)values with the volatile matter of the coals.Similarly,the d_(002)values show linear relationship with C_(dmf) contents for demineralized as well as for the treated coals in both the media.The L_(c) and N_(c) values have decreased in treated coals corresponding to demineralized coals.The present study shows that nitration in both the media is capable of removing the aliphatic side chains from the coals and aromaticity(f_(a))increases with increase in rank and shows a linear relationship with the vitrinite reflectance.The corresponding I_(26)/I_(20)values are least for treated coals in glacial acetic acid medium followed by raw and then to treated coals in aqueous medium.FTIR studies show that coal arenes of the raw coals are converted into nitro-arenes in structurally modified coals(SMCs)in both the media,the corresponding bands at 1550-1490 and 1355-1315 cm^(-1) respectively.FTIR study confirms that nitration is the predominant phenomenon,though,oxidation and nitration phenomena takes place simultaneously during treatment with nitric acid to form SMCs.In comparison to raw coals,the SMCs show higher aromaticity and may be easily converted to coal derived products like activated carbon and specialty carbon materials. | Prabal Boral Atul K.Varma Sudip Maity | 2021 | International Journal of Coal Science & Technology2021，8，5： | 2 |
| 2 | Effects of postprandial state and mesenteric blood flow on the repeatability of MR elastography in asymptomatic subjects显示文摘 | Catherine D.G.Hines Mary J.Lindstrom Adarsh K.Varma Scott B.Reeder | 2010 | J. Magn. Reson. Imaging2010，，： | 1 |
| 3 | 2014年10月至2015年4月纽约市对来自埃博拉疫情国家旅客的主动监测显示文摘西非埃博拉病毒病(简称“埃博拉”)暴发疫情已夺走近11300人的生命,其严重程度和流行进程促使许多未受影响的国家为来自埃博拉疫情国家的输入病例作准备。2014年10月,美国疾病预防控制中心(CDC)和美国国土安全部(Department of Homel and Security,DHS)在纽约市约翰肯尼迪国际机场、芝加哥奥黑尔国际机场、新泽西纽瓦克自由国际机场、亚特兰大哈兹菲尔德杰克逊国际机场、弗吉尼亚州华盛顿杜勒斯国际机场等5个美国机场实行强化入境风险评估和管理。 | alexander j.millman shadi chamany seth guthartz sayone thihalolipavan michael porter andrew schroeder neil m.vora jay k.varma david starr 宫宵欢(翻译) 陆仁敏(审校) | 2017 | 上海预防医学2017，29，4： | 0 |
| 4 | Influence of coke structure on coke quality using image analysis method显示文摘The quality of coke affects the performance of the blast furnace, factors affecting coke quality include coal properties, coal charge granulometry and carbonization conditions. The coke properties in elude the size analysis, cold strength (Micum Indices-M4(). MI0) and hot strength (Coke Reactivity Index-CRI, Coke Strength after Reaction-CSR) properties and structural properties such as coke structure and texture. Structural properties comprise the porosity, pore-cell wall thickness and pore sizes, while textures consist of the carbon forms in the coke. In present work, advanced method such as image analysis method was used to interpret coke microstructure. Conventional methods such as determination of coke porosity by measurement of real and apparent density and mercury porosimetry have a number of limitations. Coke size, magnification, number of image frames captured, process of pellet preparations and coke properties such as M4(), M|0, CRI and CSR (low, medium and high values) were taken as variables for experimental purposes. The coke structure parameters such as porosity, length, perimeter, breadth, roundness, pore-wall thickness and pore size distribution of the pores were determined by image analysis method. This method provided average porosity in addition to pore-wall thickness and pore-size distribution. The pore wall thickness measuremenl by image analysis method provided significant correlations with M40, CRI and CSR values. This explained the usability of image analysis for coke structure measurement. | B.Ghosh B.K.Sahoo B.Chakrabortv K.K.Manjhi S.K.Das J.N.Sahu Atul K.Varma | 2018 | International Journal of Coal Science & Technology2018，5，4： | 0 |
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