1. Faculty Publications
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Item �ber den Einflu� von Schwefelwasserstoff auf die Korrosion des Eisens in sauren L�sungen(1979) Ramchandran, T.; Bohnenkamp, K.An Eisenelektroden wurden in anges�uerten Perchlorat und Sulfatl�sungen nach Einleiten von Schwefelwasserstoff erheblich ver�nderte Stromdichte?Potentialkurven beobachtet. Gegen�ber den reinen L�sungen ergeben sich mit Schwefelwasserstoff stark erh�hte anodische Stromdichten und bis um den Faktor 10 erh�hte Korrosionsgeschwindigkeiten. Dabei sind die anodischen Tafelgeraden log iA = f (E) mit H2S nur rund halb so steil wie ohne H2S. Wahrscheinlich wirken die SH??Ionen �hnlich wie die OH??Ionen als Katalysator der Eisenaufl�sung, sind aber bis fast zur S�ttigung absorbiert. Copyright � 1979 Verlag GmbH & Co. KGaA, WeinheimItem Vapor phase oxidation of p?xylene(1978) Mathur, B.C.; Viswanath, D.S.The kinetics of the vapor phase oxidation of p?xylene over ferric molybdate catalyst were studied in an isothermal, differential, tubular flow reactor in the temperature range of 360 to 420� C. The major product obtained was p?tolualdehyde with small amounts of maleic anhydride and p?toluic acid. No terephthalic acid or CO2 were observed. The reaction rate data collected fit the redox model given by Equation 1. The values of activation energies Ex, Eo and frequency factors Ax, Ao obtained are 72, 63 kJ/mol and 0.64, 2.89 m3/kg catalyst s respectively. The reaction mechanism was established by studying the oxidation of p?tolualdehyde, toluic and terephthalic acids. It is concluded that the reaction follows a parallel?consecutive scheme. Copyright � 1978 Canadian Society for Chemical EngineeringItem The effect of the thickness of the porous material on the parallel plate channel flow when the walls are provided with non-erodible porous lining(1976) Channabasappa, M.N.; Umapathy, K.G.; Nayak, I.V.Flow through a channel whose walls are lined with non-erodible porous material is investigated using Beavers and Joseph slip boundary condition. It is shown that the effect of porous lining is to increase the mass flow rate and to decrease the friction factor. 1976 Martinus Nijhoff Publishers.Item Test performance of a ten tonnes reinforced concrete loading frame(1974) Raju, H.K.; Basavarajaiah, B.S.The paper reports an experimental investigation on a reinforced concrete loading frame of ten tonnes working load capacity. The loading frame was fabricated by using two doubly reinforced concrete beams to serve as flexural members. Eight numbers of mild steel rods connected to the beams by plates and nuts served as supports for the beams and also as tension members during testing of structural elements. The stress distribution and loadeflexion characteristics of the flexural members of the frame was investigated in the working load range of to tonnes. Theoretical and experimental observations indicated that the flexural member behaves like a beam with partial fixity at the ends. 1974 Secr tariat de R daction.Item Response of circular bridge decks to moving vehicles(1977) Ramakrishnan, R.; Kunukkasseril, V.X.This paper discusses the dynamic response of a curved bridge deck to a moving vehicle. The bridge deck is idealized as a set of annular sector plates and circular rings rigidly jointed together. On the basis of classical plate and ring theories a method has been developed to obtain the response to a moving vehicle idealized as a spring mass system. After obtaining the normal modes and frequencies and establishing the orthogonality conditions, the problem of the forced motion of the deck is solved by the method of spectral representation. Numerical results have been presented to illustrate the effect of several vehicle and bridge parameters on the response. Copyright 1977 John Wiley & Sons, LtdItem Proton magnetic shielding anisotropy in acetylene(1973) Mohanty, S.A high resolution N.M.R. study of acetylene in different liquid crystals is reported. The anisotropy in proton chemical shift has been measured accurately. The present result differs considerably from the values previously reported and is found to be independent of liquid crystal medium, concentration or density and reference of chemical shift measurement. Additional chemical shift data in gaseous acetylene and methane tetramethylsilane (TMS) relative shifts in nematic and isotropic phases of the liquid crystals are also given. 1973 Taylor & Francis Group, LLC.Item Properties of laterite aggregate concrete(1972) Raju, N.K.; Ramakrishnan, R.The paper presents the results of tests conducted on fresh and hardened concrete using laterite as aggregate. Several mixes of laterite aggregate concrete were made with varying watercement and aggregate-cement ratios to study the properties like workability, compressive, flexural, tensile strength and Modulus of elasticity. The tests indicate that the workability decreases with increasing aggregate-water ratio. The compressive strength of laterite aggregate concrete is considerably lower than that of gravel or crushed granite aggregate concrete, while the average ratio of cylinder to cube strength compared favourably with that for normal aggregate concrete, for the range of aggregate and water-cement ratios covered in this investigation. 1972 Secr tariat de R daction.Item Pre combustion energy release and its effect on flame propagation and exhaust emissions in a spark ignition engine(1977) Samaga, B.S.; Murthy, B.S.The extents of pre combustion reaction and cumulative pre combustion energy release have been computed for various operating conditions in a single cylinder variable compression ratio research engine. Exhaust emission levels of CO and HC are measured by gas chromatography. The mean turbulent flame propagation velocity is estimated from a thermodynamic analysis of the engine cylinder pressure trace. The effect of pre combustion energy release on the flame velocity and the exhaust emissions of CO and HC has been discussed. It is found that the pre combustion energy release may account for as much as 20% of the heat in the fuel in the case of reactive fuels of relatively low octane numbers. In general, increased pre combustion reactivity is found to decrease CO and HC emission levels. However, its effect on the mean engine flame velocity does not appear to be pronounced.The extents of pre-combustion reaction and cumulative pre-combustion energy release have been computed for various operating conditions in a single cylinder variable compression ratio research engine. Exhaust emission levels of CO and HC are measured by gas chromatography. The mean turbulent flame propagation velocity is estimated from a thermodynamic analysis of the engine cylinder pressure trace. The effect of pre-combustion energy release on the flame velocity and the exhaust emissions of CO and HC has been discussed. It is found that the pre-combustion energy release may account for as much as 20% of the heat in the fuel in the case of reactive fuels of relatively low octane numbers. In general, increased pre-combustion reactivity is found to decrease CO and HC emission levels. However, its effect on the mean engine flame velocity does not appear to be pronounced.Item On exceptional values of entire and meromorphic functions(1974) Narayanan, K.A.Let f(z) be meromorphic function of finite nonzero order ?. Assuming certain growth estimates on f by comparing it with r?L(r) where L(r) is a slowly changing function we have obtained the bounds for the zeros of f(z) -g (z) where g (z) is a meromorphic function satisfying T (r, g)=o {T(r, f)} as r ? ?. These bounds are satisfied but for some exceptional functions. Examples are given to show that such exceptional functions exist. 1974 Indian Academy of Sciences.Item Nuclear magnetic resonance studies of 13 C-enriched acetylene(1973) Mohanty, S.Analysis of 1H and 13C spectra of 1-13 C-acetylene gives the same relative sign for JCH and J'CH. Precise chemical. 1973.
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