NOPR Community:

Studies on effect of topology on pulp and paper characteristics of Eucalyptus camaldulenosis

2005-05-01T00:00:00Z

Title: Studies on effect of topology on pulp and paper characteristics of Eucalyptus camaldulenosis Authors: Dulta, Dharm; Malik, R S; Upadhyayaa, J S; Tyagi, C H; Upadhyaya, M K Abstract: The seedlings of Eucalyptus camaldulenosis of same genotype were grown at different geographical locations having distinct pre- and post-monsoon ground water levels. It is observed that as the ground water level recedes, balloon like structures known as tyloses develop, which affect the plant anatomy, physico-chemical and pulp and paper making characteristics of E. camaldulenosis. The aging of E. camaldulenosis has marked adverse impact on morphological, physico-chemical composition, pulping and black liquor characteristics along with mechanical strength properties of paper. Page(s): 332-340

Kinetic theory --- From Euler to Maxwell

2005-11-01T00:00:00Z

Title: Kinetic theory --- From Euler to Maxwell Authors: Wisniak, Jaime Abstract: Acceptance of the kinetic theory of gases was the entrance to the development of the concepts that presently explain the structure of matter. The basic ideas of the Greek philosophers remained dormant for several centuries until Euler, Bernoulli, Herapath, Waterston, Clausius, and Maxwell, injected a sounder physical picture that led to our actual understanding of the structure of a gas. Page(s): 730-742

Indirect complexometric determination of mercury(II) using 1-propane thiol (PT) as a selective masking agent

2005-11-01T00:00:00Z

Title: Indirect complexometric determination of mercury(II) using 1-propane thiol (PT) as a selective masking agent Authors: Parameshwara, P; Karthikeyan, J; Shetty, A Nityananda; Shetty, Prakash Abstract: A complexometric method for the determination of mercury(II) in presence of other metal ions is described based on the selective masking action of 1-propane thiol towards mercury(II). Mercury(II) present in a given sample solution is first complexed with an excess of EDTA and the unreacted EDTA is titrated against lead nitrate solution at pH 5-6 (hexamine buffer) using xylenol orange as the indicator. A 0.8% aqueous solution of 1-propane thiol is then added to displace EDTA from the Hg(II)-EDTA complex. The released EDTA is titrated with standard lead nitrate solution as before. Reproducible and accurate results are obtained for 4-85 mg of mercury(II), with relative error less than ±0.23 % and coefficient of variation not more than ±0.41 %. The effects of various ions were studied. The method is used for the analysis of mercury(II) in its synthetic alloy mixtures and also in complexes. Page(s): 727-729

Role of instrumental techniques in studies on wet oxidation of coal: A review

2005-11-01T00:00:00Z

Title: Role of instrumental techniques in studies on wet oxidation of coal: A review Authors: Sen, Raja; Srivastava, Sunil K; Singh, Madan M Abstract: Coal being a complex macromolecular solid is insoluble in most organic solvents. For structural studies, coal has to be subjected to chemical degradation to generate smaller fragments, which are more amenable for characterisation. For this, oxidative degradation is commonly used. A large number of wet oxidising agents have been used by researchers. All these oxidising agents have shown different reactivities and mode of attack with respect to coal. However, for structural analysis to be successful the fragments generated by oxidation must be well characterised to generate the maximum information. This review discusses the use of various instrumental techniques used to characterise the oxidation products. Page(s): 719-726