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11.
AWADESH KR MALLIK NANADADULAL DANDAPAT PRAJIT GHOSH UTPAL GANGULY SUKHENDU JANA SAYAN DAS KAUSTAV GUHA GARFIELD REBELLO SAMIR KUMAR LAHIRI SOMESWAR DATTA 《Bulletin of Materials Science》2013,36(2):193-202
Diamond-like nanocomposite (DLN) coatings have been deposited over different substrates used for biomedical applications by plasma-enhanced chemical vapour deposition (PECVD). DLN has an interconnecting network of amorphous hydrogenated carbon and quartz-like oxygenated silicon. Raman spectroscopy, Fourier transform–infra red (FT–IR) spectroscopy, transmission electron microscopy (TEM) and X-ray diffraction (XRD) have been used for structural characterization. Typical DLN growth rate is about 1 ${\upmu} $ m/h, measured by stylus profilometer. Due to the presence of quartz-like Si:O in the structure, it is found to have very good adhesive property with all the substrates. The adhesion strength found to be as high as 0·6 N on SS 316 L steel substrates by scratch testing method. The Young’s modulus and hardness have found to be 132 GPa and 14· 4 GPa, respectively. DLN coatings have wear factor in the order of 1 × 10???7 mm 3 /N-m. This coating has found to be compatible with all important biomedical substrate materials and has successfully been deposited over Co–Cr alloy based knee implant of complex shape. 相似文献
12.
ABSTRACT Based on the bond graph approach, the paper presents a developement of a dynamic model required for the simulation of a current–source–inverter (CSI) driven induction motor. The induction machine Is represented by the mutually perpendicular α–β model in a stationary reference frame, and is linked with the three phase current source inverter by a power conserving transformation which is taken as displacement modulated transformer structure In the bond graph model. A specific digital simulation program (COSMO–CAD) yields state space representation of the system from the bond graph structure with no reference to particular circuit configurations, representing various modes, during normal or abnormal operation. The acceptability of the simulation technique is shown by comparison of some results with those obtained from an available method of simulation. 相似文献
13.
MITA GHOSH 《Journal of Food Lipids》1997,4(3):189-197
Separation, quantitative analysis and fatty acids characterization of different phospholipids of a freshwater fish from India, C. pabda were carried out. Substantial amounts of 20:4n-6, 8:0, 10:0, and C13, C17 fatty acids were detected, in addition to the other fatty acids common in freshwater species. The principal fatty acids were 14:0, 16:0, 16:1, 18:0, 18:1, 18:2n-6, 18:3n-3, 20:4n-6, 20:5n-3 and 22:6n-3. The pattern of fatty acid distribution among phospholipid classes showed general similarities with minor variations. 相似文献
14.
R. N. MITRA K. GHOSH B. K. SINGH N. K. D. CHOWDHURY 《International Journal of Electronics》2013,100(2):355-360
Ternary Ni-Co-W alloy semiconductor diodes were fabricated by the method of electrodeposition and their properties were studied. Determination of barrier height of ternary alloy semiconductor diode from T-V and C-V measurements showed that it was alloy composition dependent and lay between alloy component semiconductor barrier height values. 相似文献
15.
AMITABHA GHOSH DILIP KUMAR PRATIHAR M V V AMARNATH GUENTER DITTRICH JORG MUELLER 《Sadhana》2012,37(5):539-556
During the course of development of Mechanical Engineering, a large number of mechanisms (that is, linkages to perform various types of tasks) have been conceived and developed. Quite a few atlases and catalogues were prepared by the designers of machines and mechanical systems. However, often it is felt that a clustering technique for handling the list of large number of mechanisms can be very useful, if it is developed based on a scientific principle. In this paper, it has been shown that the concept of fuzzy sets can be conveniently used for this purpose, if an adequate number of properly chosen attributes (also called characteristics) are identified. Using two clustering techniques, the mechanisms have been classified in the present work and in future, it may be extended to develop an expert system, which can automate type synthesis phase of mechanical design. To the best of the authors?? knowledge, this type of clustering of mechanisms has not been attempted before. Thus, this is the first attempt to cluster the mechanisms based on some quantitative measures. It may help the engineers to carry out type synthesis of the mechanisms. 相似文献
16.
Pulmonary circulatory system is analytically studied in this paper. Tho existing model of the circulation process is modified by introducing an inertance element in the system determining the right ventricular dynamics. The value of the inertance is estimated by applying control theory. The stability, controllability and observability uf the system having this modified rnodol are studied. It is found that this process is always stable, completely controllable and also observable. 相似文献
17.
Fatigue performance of spot welded lap shear joint is primarily dependent on weld nugget size, sheet thickness and corresponding joint stiffness. Two automotive steel sheets having higher strength lower thickness and lower strength higher thickness are resistance spot welded with established optimum welding condition. The tensile‐shear strength and fatigue strength of lap shear joint of the two automotive steel sheets are determined and compared. Experimental fatigue life of spot welded lap shear joint of each steel are compared with predicted fatigue lives using different stress intensity factor solutions for kinked crack and spot weld available in literature. Micrographs of fatigue fractured surfaces are examined to understand fracture micro‐mechanisms. 相似文献
18.
Adsorption of acetylene, vinyl chloride and hydrogen chloride on activated carbon has been investigated using a transient response technique over a temperature range of 25–200°C. Thermodynamics and adsorption parameters have been estimated from the well-known correlations and gas-phase concentration profiles. Physical adsorption and chemisorption have been found distinguishable. 相似文献
19.
A systematic method of testing and realization of Boolean functions with a large number of unspecified states by a single threshold logic element has been presented in this paper. By this method, it is possible to determine many different threshold realizations of the given incomplete function. The method can be applied to switching functions containing any number of variables. 相似文献
20.
A destructive and a nondestructive method of estimating residual volume of air in retort pouches were compared. The difference between the volumes of air given by two techniques were found to be significant (P < 0.05) by paired t-test. An indirect calculation method was developed for estimation of internal pressure at neutral buoyancy and when used in conjunction with Archimedes’ Principle and Boyle's Law significantly improved the results. This method of calculating residual air in flexible pouches did not show any significant difference (P > 0.01) when compared to the standard destructive technique. The procedure outlined is easy to use. 相似文献