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1.
The thermal expansion of a titanium modified, swelling resistant austenitic stainless steel designated as D9 is studied by measuring the lattice parameter as a function of temperature in the range 300-1300 K by high-temperature X-ray diffraction technique. The thermal expansion data thus obtained is in reasonable agreement with the typical thermal expansion values reported for similar nuclear grade austenitic stainless steels. However, at temperatures exceeding 900 K, the measured thermal expansivity exhibits a pronounced non-linear increase due partly to the precipitation of complex carbide and intermetallic phases. The high-temperature thermal expansion data obtained in the present study are augmented by modelling the low-temperature thermal expansion behaviour by Grüneisen formalism. 相似文献
2.
G. Balakrishnan P. Kuppusami S. Murugesan Chanchal Ghosh Divakar Ramachandran E. Mohandas D. Sastikumar 《Transactions of the Indian Institute of Metals》2011,64(3):297-299
Multilayers of CeO2/ZrO2 thin films were deposited on Si (100) substrates using pulsed laser deposition at an optimized oxygen partial pressure of 3×10−2 mbar and at room temperature. The CeO2 layer thickness was 10 nm, while the ZrO2 layer thickness was varied as 10, 20 and 30 nm. CeO2 and ZrO2 layers were deposited alternately to obtain 25 bilayers. High temperature x-ray diffraction (HTXRD) results showed that the multilayer films had cubic ceria and tetragonal ZrO2. Thermal expansion coefficients were calculated for CeO2 and t-ZrO2 and found to increase with the decrease of ZrO2 layer thickness. The cross sectional transmission electron microscopy (XTEM) of CeO2/ZrO2 multilayer also indicated that ceria was found to be in cubic phase while zirconia contained predominantly tetragonal phase along with cubic phase in thermally annealed specimen. 相似文献
3.
A proper node architecture design capable to support different network protocol enhances the data transport capability of a wavelength division multiplexed system. In the present paper a simple node architecture model has been developed to simulate the node throughput based on media access control protocols for bursty data traffic of variable time slot duration and data rate. An appropriate mathematical model has been derived to evaluate different types of traffic reservation protocols used in WDM networks. It has been observed that the network performance is well controlled through implemented protocols and network design parameters. 相似文献
4.
13CP/MAS NMR spectroscopic studies of some starches from cereals (wheat, maize and finger millet), pulses (green gram, chick pea), tuber (potato) and root (tapioca), and their respective acid (HCI, HNO3) modified starches were carried out. While cereal starches exhibited a triplet signal for their anomeric carbons, pulse, tuber and root starches showed doublets. Line width changes in signals indicated that debranching in the above modified starches led to narrowing of C6 signals (more pronounced in the case of potato and tapioca starches) and were consistent with the release of branching strains. Potato starch, both native and modified, was found to be different from other starches as inferred from the chemical shift values for their anomeric carbons and line shape. The dihedral angle (ϕ′2) calculated from chemical shift values for C1 and conformation of dihedral angel (x) as predicted from chemical shift of C6 are discussed with respect to structural organization. 相似文献
5.
Reena Rao S. Divakar Belur R. Lokesh 《Journal of the American Oil Chemists' Society》2002,79(6):555-560
The preference of lipase (EC 3.1.1.3) from Rhizomucor miehei in the incorporation of 11 FA, ranging from C10∶0 to C22∶6, into coconut oil TAG during acidolysis was studied by applying
the Plackett-Burman experimental design. Enzymatic acidolysis reactions were carried out in hexane at 37°C for 48 h with coconut
oil (0.1 M) and a mixture of 11 FA at a TAG to FA molar ratio of 1∶1. Lipase was used at the 5 wt% level. The incorporation
of FA into coconut oil TAG was determined by GC. The lipase showed preference for long-chain saturated FA for incorporation
into coconut oil TAG. The FA with 18 carbon atoms showed a high incorporation rate (18∶1>18∶1>18∶3). The lipase showed the
least preference for the incorporation of 12∶0, which occurs in maximal concentration (46%), whereas the most preferred FA,
18∶0, occurs at a very low concentration (<2%) in coconut oil. The overall preference of lipase for the incorporation of different
FA into coconut oil TAG was 18∶0>18∶2, 22∶0>18∶1, 18∶3, 14∶0, 20∶4, 22∶6>16∶0>12∶0≫10∶0. 相似文献
6.
P. Rao D. Narasimha Rao D. Sujatha K. Rathina Raj S. Vishwanatha K. Narasimhamurthy P. Saibaba S. Divakar 《European Food Research and Technology》2000,211(6):393-395
Subchronic toxicity dietary studies were conducted in albino rats on the safety aspects of residual β-cyclodextrin in egg
samples treated for cholesterol removal at concentrations of 250, 125 and 20 ppm for a period of 90 days. Daily food intake,
body weight gain, relative organ weights, histopathology, haematology and serum enzyme activities were studied. The study
however, did not reveal any toxicity at any of the levels tested. It can therefore be concluded from the present study that
β-cyclodextrin-treated egg samples do not cause any toxicity.
Received: 28 September 1999 相似文献
7.
Naresh Vankamamidi S. Allavarpu V. V. L. Divakar Reddi Sivaranjani 《The Journal of supercomputing》2022,78(6):8708-8732
The Journal of Supercomputing - The contemporary Group Key Agreement (GKA) entails lightweight computing, reduced communication, decentralized certification, personal privacy protection,... 相似文献
8.
Divakar Rajamani Dr Gajendra Kumar Adil 《The International Journal of Advanced Manufacturing Technology》1998,14(4):298-305
Scheduling and sequencing compounds on banbury mixers is a daily production planning function in a tyre company. The current scheduling procedures are based on experience. A number of factors, such as, capacity, cost, time, speed, set-up of mixers, compound changeovers, density and demand of compound, have to be considered during planning. In this paper, we propose a two-stage approach to this problem. This approach can be easily computerised to aid the personnel in the planning function. An example, considering actual data obtained from the company, is used to illustrate the approach. The current scheduling practice by company personnel, as inferred from past record, is also reported. 相似文献
9.
Duraiswami Divakar Dhanagopal Manikandan Valentine Rupa Esther Leena Preethi Revathi Chandrasekar Thiripuranthagan Sivakumar 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2007,82(3):253-258
Palladium nanoparticles were generated in the interlamellar region of swelling 2:1 type vermiculite clay using an adsorption excess isotherm. An adsorption excess isotherm was constructed for vermiculite after exchanging the exchangeable Na+ ions in the interlamellar region using a binary liquid mixture (ethanol:toluene). Based on adsorption excess isotherm, 1% w/w palladium was intercalated into the interlamellar space of vermiculite. The Pd‐intercalated vermiculite was characterized by X‐ray diffraction, transmission electron microscopy and atomic absorption spectroscopy. The 1% w/w Pd‐intercalated vermiculite was tested for its catalytic activity towards selective hydrogenation reactions involving some α,β‐unsaturated carbonyl compounds using a pulse reactor and its catalytic activity was compared with commercial 1% Pd/C. The intercalated catalyst was found to be very selective towards the desired product of unsaturated alcohols. Copyright © 2007 Society of Chemical Industry 相似文献
10.
Lingappa Rangaraj Siriyara J. Suresha Canchi Divakar Vikram Jayaram 《Metallurgical and Materials Transactions A》2008,39(7):1496-1505
Dense ZrB2-ZrC and ZrB2-ZrC
x∼0.67 composites have been produced by reactive hot pressing (RHP) of stoichiometric and nonstoichiometric mixtures of Zr and B4C powders at 40 MPa and temperatures up to 1600 °C for 30 minutes. The role of Ni addition on reaction kinetics and densification
of the composites has been studied. Composites of ∼97 pct relative density (RD) have been produced with the stoichiometric
mixture at 1600 °C, while the composite with ∼99 pct RD has been obtained with excess Zr at 1200 °C, suggesting the formation
of carbon deficient ZrC
x
that significantly aids densification by plastic flow and vacancy diffusion mechanism. Stoichiometric and nonstoichiometric
composites have a hardness of ∼20 GPa. The grain sizes of ZrB2 and ZrC
x∼0.67 are ∼0.6 and 0.4 μm, respectively, which are finer than those reported in the literature.
This article is based on a presentation given in the symposium entitled “Materials Behavior: Far from Equilibrium” as part
of the Golden Jubilee Celebration of Bhabha Atomic Research Centre, which occurred during December 15–16, 2006 in Mumbai,
India. 相似文献