http://nopr.niscair.res.in/handle/123456789/2465 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/2542 Title: Spectrophotometric determination of carbosulfan in environmental samples <br/> <br/>Authors: Sao, Aruna; Pillai, Ajai K; Gupta, V K <br/> <br/>Abstract: This study presents carbosulfan determination by a novel rapid, simple, sensitive and an extractive method, which is based on alkaline hydrolysis of carbosulfan into phenol followed by coupling with diazotized p- amino acetophenone in alkaline medium. Red brown dye (lmax 465 nm) can be extractable in 2-methyl butanol, which makes reaction more sensitive with same lmax. Beer’s law is obeyed between 0.8-5.6 ppm and 0.1-0.6 ppm in aqueous and extractive system respectively. Molar absorptivity and Sandell’s sensitivity were found to be 4.46x 10⁴ l mol⁻¹ cm⁻¹ and 0.0085 μg cm⁻² respectively. Method has been satisfactorily applied for carbosulfan determination in various environmental samples. <br/> <br/>Page(s): 1088-1091 http://nopr.niscair.res.in/handle/123456789/2541 Title: Effect of substituents on thermal behavior of some symmetric double schiff’s bases containing a cardo group <br/> <br/>Authors: Aghera, V K; Parsania, P H <br/> <br/>Abstract: Thermal behavior of symmetric double schiff’s bases containing cardo group has been studied by TGA and DSC techniques at 10°C/min in nitrogen atmosphere. DSC transitions, thermal stability and kinetic parameters are affected by nature and position of substituents. Schiff’s bases are thermally stable between 173-272°C and followed either a single step or two steps degradation (fractional or integral order). Different magnitudes of n, E and A suggested different degradation mechanisms. A large and negative magnitudes of “S* confirmed highly ordered transition state, while positive magnitudes of “S* confirmed less ordered transition state. <br/> <br/>Page(s): 1083-1087 http://nopr.niscair.res.in/handle/123456789/2540 Title: Influences of temperature on flash pyrolysis products of asphaltite <br/> <br/>Authors: Saydut, Abdurrahman; Hamamci, Candan <br/> <br/>Abstract: Seguruk (Sirnak, Turkey) asphaltite by flash pyrolysis in a fixed bed reactor with a heating rate 40°C min-1 at 400-800°C (optimum 550°C) under nitrogen atmosphere gave: solid residue (char), 67.68; oil, 13.28; and water, 0.99%. Seguruk asphaltite contained: asphaltene, 28.72; preasphaltene, 10.43; aliphatics, 52.54; aromatics, 5.05; and polar aromatic compounds, 3.26%. Oil obtained from asphaltite is mainly aliphatic according to FTIR spectrum. <br/> <br/>Page(s): 1118-1122 http://nopr.niscair.res.in/handle/123456789/2539 Title: Use of range control charts in determination of variability in surface parallelisms of plates <br/> <br/>Authors: Ankara, Huseyin; Yerel, Suheyla <br/> <br/>Abstract: Statistical Process Control methods are used to measure and diagnose variability occurring within processes. In this study, surface parallelisms in plates cut by circle saw block cutter machine from marble blocks were determined by Range (R) control charts produced by thickness measurements of plates. Correlation between surface parallelisms of plates cut was examined. It was suggested that the use of correlation analysis to determine similarities and differences among plates cut at different levels was significant for control of machinery and R control charts. <br/> <br/>Page(s): 1078-1082