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1.
2.
Adherent and pin-hole free amorphous Sb2Te3 thin films have been obtained by vacuum evaporation at substrate temperatures ≤25 °C. The films have been crystallized by thermal and laser annealing, and the crystallization processes monitored as a function of annealing temperature and laser scan speed. A comparative study of topography reveals disk-shaped crystallized areas in thermal crystallization and dendrite growth in the laser induced process. The crystallized films in both cases contain a single Sb2Te3 phase. Activation energy of 2 eV for crystallization, determined using differential scanning calorimetery indicates good room temperature stability of the amorphous states. 相似文献
3.
The methodology for developing intelligent integrated computer-aided design and manufacturing systems based on object-oriented principles is discussed. The ways in which the application of these principles affects the nature of these systems are reviewed. The implementation of an automated, intelligent, and flexible computer-integrated-manufacturing (CIM) system prototype using an object-oriented programming environment (Smalltalk-80, Version 4.0) is detailed. A CIM system includes CAD, a process planner, and an inspection planner. Each of these components is discussed individually 相似文献
4.
Good-quality diamond-like carbon films (6 at.% H2, 2400 kgf/mm2 microhardness, 2.7 eV bandgap, higly insulating) have been obtained by the DC glow discharge decomposition of acetylene. Mass spectroscopic thermal effusion measurements were carried out on the films deposited under different deposition conditions. Analyses of hydrogen in conjunction with hydrocarbon effusing species yield information on the microstructure and nature of C---H bonding configurations. It is shown to be a useful analytical tool to study hydrogenated amorphous carbon films of different microstructures varying from polymer-like to diamond-like. 相似文献
5.
Single point incremental forming: state-of-the-art and prospects 总被引:1,自引:0,他引:1
Joost R. Duflou Anne-Marie Habraken Jian Cao Rajiv Malhotra Markus Bambach Dave Adams Hans Vanhove Amirahmad Mohammadi Jack Jeswiet 《International Journal of Material Forming》2018,11(6):743-773
Incremental sheet metal forming in general and Single Point Incremental Forming (SPIF) specifically have gone through a period of intensive development with growing attention from research institutes worldwide. The result of these efforts is significant progress in the understanding of the underlying forming mechanisms and opportunities as well as limitations associated with this category of flexible forming processes. Furthermore, creative process design efforts have enhanced the process capabilities and process planning methods. Also, simulation capabilities have evolved substantially. This review paper aims to provide an overview of the body of knowledge with respect to Single Point Incremental Forming. Without claiming to be exhaustive, each section aims for an up-to-date state-of-the-art review with corresponding conclusions on scientific progress and outlook on expected further developments. 相似文献
6.
Using direct and indirect equilibration methods, the solubilities of iron in molten bismuth and those of bismuth in molten iron-carbon alloys have been measured over the temperature range 1473-1873 K. The Henrian behaviour of bismuth in molten ferrous alloys allows the calculation of its activity coefficient, which in turn facilitates modelling as a function of temperature and carbon content, using the unified interaction parameter formalism developed by Pelton and Bale. The modelling results generate the expression: . A model has also been developed expressing bismuth content in molten iron-carbon alloys as a function of temperature and composition: . 相似文献
7.
Empirical validation of software metrics used to predict software quality attributes is important to ensure their
practical relevance in software organizations. The aim of this work is to find the relation of object-oriented (OO) metrics
with fault proneness at different severity levels of faults. For this purpose, different prediction models have been developed
using regression and machine learning methods. We evaluate and compare the performance of these methods to find which method
performs better at different severity levels of faults and empirically validate OO metrics given by Chidamber and Kemerer.
The results of the empirical study are based on public domain NASA data set. The performance of the predicted models was evaluated
using Receiver Operating Characteristic (ROC) analysis. The results show that the area under the curve (measured from the
ROC analysis) of models predicted using high severity faults is low as compared with the area under the curve of the model
predicted with respect to medium and low severity faults. However, the number of faults in the classes correctly classified
by predicted models with respect to high severity faults is not low. This study also shows that the performance of machine
learning methods is better than logistic regression method with respect to all the severities of faults. Based on the results,
it is reasonable to claim that models targeted at different severity levels of faults could help for planning and executing
testing by focusing resources on fault-prone parts of the design and code that are likely to cause serious failures. 相似文献
8.
This paper develops a framework for the consideration of internal markets as an alternative to information systems (IS) outsourcing. It is based on an assessment of the pros and cons of both outsourcing and of insourcing based on the internal markets approach. It is formulated in terms of the operational, tactical, and strategic impacts of the choice among the alternatives. The framework, and the propositions that are developed from it, should be useful both for researchers, who can use it for developing testable research hypotheses, and for practitioners, who may use it as a basis for developing a comprehensive set of criteria for the evaluation of these sourcing options. 相似文献
9.
S. Arul L. Vijayaraghavan S.K. Malhotra R. Krishnamurthy 《The International Journal of Advanced Manufacturing Technology》2006,29(7-8):655-662
Drilling trials have been carried out on glass Fibre reinforced plastics (GFRP) with plain high speed steel (HSS), TiN coated
HSS and tipped tungsten carbide drills. Most of the defects in drilling of composites are due to thrust force experienced
by the workpiece. The parametric influence on cutting force was experimentally evaluated. The experimental results show that
the defects toleranced drilling can be attained by proper selection of cutting parameters and tool material. This is substantiated
by monitoring flank wear, hole shrinkage and acoustic emission during drilling. 相似文献
10.
Effects of processing and cooking on ascorbic acid content of chickpea (Cicer arietinum L) varieties
Chickpea (Cicer arietinum L) is an important source of protein in several developing countries. Two commonly grown chickpea cultivars, HPG‐17 and C‐235, were evaluated for their physicochemical characteristics such as 100‐seed weight and density. Both chickpea varieties were subjected to various processing treatments and then analysed for their ascorbic acid content. The ascorbic acid content was generally found to be higher in the C‐235 variety, but it was higher in the HPG‐17 variety after germination. Significant results were obtained for both varieties after various treatments such as pressure cooking, germination, parching and solar cooking. It was found that the ascorbic acid content in both varieties decreased after all treatments except germination. © 2001 Society of Chemical Industry 相似文献