NOPR Collection:

Geotechnical investigation for support design in depillaring panels in Indian coalmines

2009-07-03T16:30:41Z

Title: Geotechnical investigation for support design in depillaring panels in Indian coalmines Authors: Singh, Ajoy K; Sinha, A; Paul, A; Saikia, K Abstract: In Indian coalmines, CMRI- RMR and NGI-Q Systems are mostly used for formulating design of support in rock engineering. Geotechnical investigation of the roof rocks plays an important role in the selection of different parameters used in rock mass classifications. In India, Bord and Pillar Method of mining is very much in practice in underground coalmines. Roof support, which is an important aspect of ground control, involves maintaining roof competency to ensure a safe and efficient mining environment. This paper deals with a case study where CMRI- RMR and NGI Q- Systems are used for estimation of rock load for design of support in a coalmine in India in semi-mechanized depillaring workings with desired success. Page(s): 358-363

Performance and emissions of natural gas fueled internal combustion engine: A review

2009-07-05T16:30:17Z

Title: Performance and emissions of natural gas fueled internal combustion engine: A review Authors: Bhandari, Kirti; Bansal, Akhil; Shukla, Anuradha; Khare, Mukesh Abstract: Natural gas, referred to as green fuel, has emerged as a solution to depleting crude oil resources as well as to the deteriorating urban air quality problem. As a gaseous fuel, gains from natural gas have already been established in terms of low emissions of carbon monoxide, hydrocarbon and particulate matter. Air-fuel ratio, operating cylinder pressure, fuel injection, and compression ratio are some of the parameters that need to be analyzed and optimally exploited for better engine performance and reduced emissions. In this study, a comprehensive review of various operating parameters and concerns have been prepared for better understanding of operating conditions (spark and compression ignited engines) and constrains for a natural gas fueled internal combustion engine. Page(s): 333-338

Purification of phycobiliproteins from Nostoc muscorum

2009-07-04T16:30:29Z

Title: Purification of phycobiliproteins from Nostoc muscorum Authors: Ranjitha, K; Kaushik, B D Abstract: Purification of phycobiliproteins from phycoerythrin (PE) rich strain of Nostoc muscorum was carried out. Salting out with 55 % (NH₄)₂SO₄ precipitates >80 % of each class of phycobiliprotein. Chromatography on DEAE cellulose-52 column gives pure PE (A₅₆₂/A₂₈₀ = 8.12), while rechromatography of the blue coloured fraction from this column using a hydroxy apatite column yields pure phycocyanin (PC) (A₆₁₅/A₂₈₀ = 3.89). SDS-PAGE analysis of purified PE and PC yields two polypeptides (~19.4 and 16.9 kDa). PE is found to be stable between pH 5-9. This protocol helps to get highly pure PE (72%) and PC (39%). Page(s): 372-375

Improvement in optical brightness of fly ash based zeolite-A for use as detergent builder

2009-07-08T16:30:14Z

Title: Improvement in optical brightness of fly ash based zeolite-A for use as detergent builder Authors: Udhoji, J S; Bansiwal, A K; Meshram, S U; Rayalu, S S Abstract: A process has been formulated for synthesis of fly ash-based Zeolite-A (FAZ-A), whose optical brightness (58.2%) is slightly less for use as detergent builder. Attempts have been made to improve the optical brightness (OB) of FAZ A samples using pretreatment of fly ash (FA) through magnetic separation of iron, acid treatment and lime treatment to control colour development in zeolite sample. Treatment of FA and FAZ-A samples has also been attempted by EDTA chelation technique to control iron content. OB, iron content and cation binding capacity (CBC) in FAZ-A sample are crucial and diagnostic parameters for assessing their use as detergent builder. Treatment methodologies have therefore been standardized for improvement in OB as a trade-off between CBC and iron content depending upon the end use of zeolite-A. Page(s): 367-371