http://nopr.niscair.res.in/handle/123456789/5180 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/5442 Title: Microprocessor based dynamic pressure neutralization system for control of fire in sealed-off area in underground coal mines <br/> <br/>Authors: Ray, S K; Bandopadhyay, L K; Sahay, N; Singh, R P; Ahamad, I; Bhowmick, B C <br/> <br/>Abstract: <smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="country-region"><smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place"> The technique of pressure balancing to combat/control underground coal mine fires is universally accepted. The technique is used in many coal mines in India and results are encouraging. However, presently adopted manual pressure balancing technique is a tedious process and sometimes calls for expert attention over a long period. To overcome these difficulties a microprocessor based automatic pressure neutralization device eliminating the need for continuous human attention is proposed. The detailed functions of the proposed device, control logic, and its flow chart are highlighted. The theory of pressure balancing technique and limitations of the manual system of pressure balancing technique are also dealt with. The salient features of the device and its placement in the mine are illustrated with suitable schematic diagram. Advantages of the system and necessary precautions to be taken while fabricating the same are also outlined. The program logic of the proposed device is illustrated in the form of a flow chart. </smarttagtype></smarttagtype> <br/> <br/>Page(s): 297-304 Fri, 27 Feb 2004 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/5441 Title: Degradation assessment of low density polythene (LDP) and polythene (PP) by an indigenous isolate of <i style="">Pseudomonas stutzeri</i> <br/> <br/>Authors: Sharma, Anjana; Sharma, Amitabh <br/> <br/>Abstract: Tensile strength, elongation, per centage extension, CFU, BOD and turbidity of plastics are assessed to study the extent of degradation of low density polyethylene (LDP) and polypropylene (PP) using <i style="">Pseudomonas stutzeri</i> under laboratory test conditions. Throughout the investigation both the plastic types are found to undergo qualitative and quantitative changes by bacteria but PP is found to be more biodegradable as compared to LDP. <br/> <br/>Page(s): 293-296 Fri, 27 Feb 2004 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/5439 Title: Effect of bis (3-triethoxy silylpropyl) tetrasulphide on the mechanical properties of flyash filled styrene butadiene rubber <br/> <br/>Authors: Alkadasi, Nabil A N; Sarmade, Bhimrao D; Kapadi, U R; Hundiwale, D G <br/> <br/>Abstract: Flyash does not contribute to properties of composites and hence there are severe limitations on its use as a filler. The paper reports determination and discussion on mechanical properties of SBR composites filled with flyash (treated and untreated). The flyash was treated with a silane coupling agent (TESPT) [Bis (3-triethoxysilylpropyl) ] tetrasulphide. The treatment resulted in enhancement of mechanical properties of composites of the rubber. In this work, properties of composites filled with treated and untreated flyash (separately) are compared. The properties under consideration were tensile strength, modulus at 100 and 400 per cent elongation, and hardness. Tensile strength was improved by 20 per cent while modulus at 100 per cent was improved by 30 per cent. Similarly Young’s modulus also was improved by 22 per cent. <br/> <br/>Page(s): 287-292 Fri, 27 Feb 2004 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/5438 Title: Extractive spectrophotometric determination of copper(II) and its applications in pharmaceutical samples and alloys <br/> <br/>Authors: Kocharekar, Archana R; Thakkar, N V <br/> <br/>Abstract: A new reagent isonitrosopropiophenone thiosemicarbazone (HINPTC) is proposed for extraction and spectrophptometric determination of copper. The reagent HINPTC reacts with copper to give yellow coloured complex, which can be quantitatively extracted into isoamyl alcohol at pH 10. The organic extract shows maximum absorption at 390 nm where absorption due to a similarly prepared reagent blank is negligible. The Beer’s law is followed in the concentration range 0.5-6.0 mg/mL of copper. The molar absorptivity and Sandell’s sensitivity of Cu(II)-HINPTC complex are 5.826 x 10³ /mol/cm and 0.010 µg/mL/cm² ,respectively. The stoichiometry of extracted species is found to be 1:2 (M : L). The proposed method is rapid, sensitive, reproducible and is applied for the determination of copper in synthetic mixtures and real samples like pharmaceuticals, aluminium alloys (Al chips and Al pins), and brass ash. It also provides a relative inexpensive alternative to more expensive instrumental method like AAS. <br/> <br/>Page(s): 283-286 Fri, 27 Feb 2004 22:58:59 GMT