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44

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International Journal of Quality & Reliability Management, vol. 10 no. 7
Type: Research Article
ISSN: 0265-671X

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Article
Publication date: 1 March 1997

M. Meniconi, D.M. Barry and D.C. Betts

The degradation of both the functional and electrical parameter performance of integrated circuits has been under investigation for a number of years. Aims to demonstrate that…

179

Abstract

The degradation of both the functional and electrical parameter performance of integrated circuits has been under investigation for a number of years. Aims to demonstrate that statistical methods may be used to determine physical changes in these devices, rather than the time‐consuming and costly procedures of physical failure analysis. In addition, draws a comparison between the functional tests and the parametric tests. The data were obtained by stressing statistical samples of TMS2114L NMOS static RAMs to varying total doses of ionizing radiation. Presents and discusses the results obtained from these tests and suggests statistical and mathematical models to estimate performance degradation.

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International Journal of Quality & Reliability Management, vol. 14 no. 2
Type: Research Article
ISSN: 0265-671X

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Article
Publication date: 1 February 1985

D.M. Barry

This article describes reliability analysis and failure cause determination in encapsulated semiconductor devices. Such devices were subjected to a destructive life test using…

61

Abstract

This article describes reliability analysis and failure cause determination in encapsulated semiconductor devices. Such devices were subjected to a destructive life test using temperature as an accelerating stress. Once the devices had failed, the failure data were statistically analysed with the aid of a digital computer. The failed devices were then decapsulated and failure causes were determined using different types of microscopy. The article gives detailed information about the tests and analysis mentioned above.

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International Journal of Quality & Reliability Management, vol. 2 no. 2
Type: Research Article
ISSN: 0265-671X

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Article
Publication date: 1 March 1997

A.Z. Keller, M. Meniconi, I. Al‐Shammari and K. Cassidy

Data sets were compiled from the MHIDAS data bank for incidents where there had been five or more fatalities, ten or more injuries, 50 evacuations, or US$1 million damage. The…

786

Abstract

Data sets were compiled from the MHIDAS data bank for incidents where there had been five or more fatalities, ten or more injuries, 50 evacuations, or US$1 million damage. The data were converted to magnitudes on the Bradford Disaster Scale and analysed using maximum likelihood. Parameters determined from the estimation procedures were compared for compatibility between themselves and the results of analyses using other data.

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Disaster Prevention and Management: An International Journal, vol. 6 no. 1
Type: Research Article
ISSN: 0965-3562

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Article
Publication date: 1 April 1997

M. Meniconi

Posits that most modern electronic equipment, particularly those involving metal‐oxide‐semiconductor technologies, are susceptible to electric overstresses which can cause…

425

Abstract

Posits that most modern electronic equipment, particularly those involving metal‐oxide‐semiconductor technologies, are susceptible to electric overstresses which can cause performance degradation and lead to equipment failure. Probably the most problematic of these stresses is known as electrostatic discharge (ESD). Since most systems incorporate some sort of electronic components or subassemblies, it is becoming increasingly important for manufacturers of such systems to employ good ESD prevention practices whenever possible. Therefore deals with the ESD phenomenon in general terms, covers the types of failures associated with ESD, and addresses the need for implementing ESD control programmes to improve quality and reliability.

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International Journal of Quality & Reliability Management, vol. 14 no. 3
Type: Research Article
ISSN: 0265-671X

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Article
Publication date: 1 March 2003

Ibrahim M. Shaluf, Fakharu’l‐razi Ahmadun and Aini Mat Said

A disaster and a crisis are two different, and related events. The two terms are sometimes used interchangeably. Man‐made disaster that occurs at an industrial organization, may…

18762

Abstract

A disaster and a crisis are two different, and related events. The two terms are sometimes used interchangeably. Man‐made disaster that occurs at an industrial organization, may develop into an industrial crisis. Crisis can happen to any organization. It has been noted that there were no universally accepted definitions yet developed for disaster and crisis. There is also no universally available criteria, to define the disaster in terms of the consequences, such as the casualties and the cost of damage. This paper reviews the definitions, types, characteristics, criteria and models of disaster and crisis. Also the types of crisis were rearranged and the differences between the disasters and crises have been summarized.

Details

Disaster Prevention and Management: An International Journal, vol. 12 no. 1
Type: Research Article
ISSN: 0965-3562

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Article
Publication date: 1 April 2005

Jaroslav Mackerle

Ceramic materials and glasses have become important in modern industry as well as in the consumer environment. Heat resistant ceramics are used in the metal forming processes or…

5158

Abstract

Purpose

Ceramic materials and glasses have become important in modern industry as well as in the consumer environment. Heat resistant ceramics are used in the metal forming processes or as welding and brazing fixtures, etc. Ceramic materials are frequently used in industries where a wear and chemical resistance are required criteria (seals, liners, grinding wheels, machining tools, etc.). Electrical, magnetic and optical properties of ceramic materials are important in electrical and electronic industries where these materials are used as sensors and actuators, integrated circuits, piezoelectric transducers, ultrasonic devices, microwave devices, magnetic tapes, and in other applications. A significant amount of literature is available on the finite element modelling (FEM) of ceramics and glass. This paper gives a listing of these published papers and is a continuation of the author's bibliography entitled “Finite element modelling of ceramics and glass” and published in Engineering Computations, Vol. 16, 1999, pp. 510‐71 for the period 1977‐1998.

Design/methodology/approach

The form of the paper is a bibliography. Listed references have been retrieved from the author's database, MAKEBASE. Also Compendex has been checked. The period is 1998‐2004.

Findings

Provides a listing of 1,432 references. The following topics are included: ceramics – material and mechanical properties in general, ceramic coatings and joining problems, ceramic composites, piezoceramics, ceramic tools and machining, material processing simulations, fracture mechanics and damage, applications of ceramic/composites in engineering; glass – material and mechanical properties in general, glass fiber composites, material processing simulations, fracture mechanics and damage, and applications of glasses in engineering.

Originality/value

This paper makes it easy for professionals working with the numerical methods with applications to ceramics and glasses to be up‐to‐date in an effective way.

Details

Engineering Computations, vol. 22 no. 3
Type: Research Article
ISSN: 0264-4401

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Article
Publication date: 22 May 2024

Mohsin Iqbal, Saravanan Karuppanan, Veeradasan Perumal, Mark Ovinis, Muhammad Iqbal and Adnan Rasul

Composite materials are effective alternatives for rehabilitating critical members of offshore platforms, bridges, and other structures. The structural response of composite…

65

Abstract

Purpose

Composite materials are effective alternatives for rehabilitating critical members of offshore platforms, bridges, and other structures. The structural response of composite reinforcement greatly depends on the orientation of fibres in the composite material. Joints are the most critical part of tubular structures. Various existing studies have identified optimal reinforcement orientations for a single load component, but none has addressed the combined load case, even though most practical loads are multiplanar.

Design/methodology/approach

This study investigates the optimal orientation of composite reinforcement for reducing stress concentration factors (SCF) of tubular KT-joints. The joint reinforcement was modelled and simulated using ANSYS. A parametric study was carried out to determine the effect of the orientations of reinforcement in the interface region on SCF at every 15° offset along the weld toe using linear extrapolation of principal stresses. The impact of orientation for uniplanar and multiplanar loads was investigated, and a general result about optimum orientation was inferred.

Findings

It was found that the maximum decrease of SCF is achieved by orienting the fibres of composite reinforcement along the maximum SCF. Notably, the optimal direction for any load configuration was consistently orthogonal to the weld toe of the chord-brace interface. As such, unidirectional composites wrapped around the brace axis, covering both sides of the brace-chord interface, are most effective for SCF reduction.

Originality/value

The findings of this study are crucial for adequate reinforcement of tubular joints using composites, offering a broader and universally applicable optimum orientation that transcends specific joint and load configuration.

Details

International Journal of Structural Integrity, vol. 15 no. 4
Type: Research Article
ISSN: 1757-9864

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Article
Publication date: 15 October 2018

Ling Wang, Fujun Wang, Bryan William Karney, Ahmad Malekpour and Zhengwei Wang

The velocity head is usually neglected in the energy equation for a pipeline junction when one-dimensional (1D) hydraulic transient flow is solved by method of characteristics…

81

Abstract

Purpose

The velocity head is usually neglected in the energy equation for a pipeline junction when one-dimensional (1D) hydraulic transient flow is solved by method of characteristics. The purpose of this paper is to investigate the effect of velocity head on filling transients in a branched pipeline by an energy equation considering velocity head.

Design/methodology/approach

An interface tracking method is used to locate the air–water interface during pipeline filling. The pressured pipe flow is solved by a method of characteristics. A discrete gas cavity model is included to permit the occurrence of column separation. A universal energy equation is built by considering the velocity head. The numerical method is provisionally verified in a series pipeline and the numerical results and experimental data accord well with each other.

Findings

The numerical results show that some differences in filling velocity and piezometric head occur in the branched pipeline. These differences arise because the velocity head in the energy equation can become an important contributor to the hydraulic response of the system. It is also confirmed that a local high point in the profile is apt to experience column separation during rapid filling. Significantly, the magnitude of overpressure and cavity volume induced by filling transients at the local high point is predicted to increase with the velocity in the pipes.

Originality/value

The velocity head in the energy equation for a pipeline junction could play an important role in the prediction of filling velocity, piezometric head and column separation phenomenon, which should be given more attention in 1D hydraulic transient analysis.

Details

Engineering Computations, vol. 35 no. 7
Type: Research Article
ISSN: 0264-4401

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Article
Publication date: 26 June 2009

Yue Suo, Jingyu Li, Yuanchun Shi and Peifeng Xiang

Smart spaces are open complex computing systems, consisting of a large variety of cooperative smart things. Central to building smart spaces is the support for sophisticated…

147

Abstract

Purpose

Smart spaces are open complex computing systems, consisting of a large variety of cooperative smart things. Central to building smart spaces is the support for sophisticated coordination among diverse smart things collaborating to accomplish specified tasks. Multi‐agent systems are often used as the software infrastructures to address the coordination issue in smart spaces. However, since agents in smart spaces are dynamic, resource‐bounded and have complicated service dependencies, current approaches to coordination in multi‐agent systems encounter new challenges when applied in smart spaces. The purpose of this paper is to address these issues.

Design/methodology/approach

The paper presents Baton, a service management system to explicitly resolve the particular issues stemming from smart spaces when coordinating agents. Baton is designed as a complement to coordination approaches in multi‐agent systems with a focus on mechanisms for service discovery, composition, request arbitration and dependency maintenance. Baton is now deployed in our own smart spaces to achieve better agent coordination.

Findings

The effectiveness and efficiency of Baton is validated by its practical use in the designed scenario and some evaluation experiments.

Research limitations/implications

An attempt at performing dynamic service composition in Baton is made by using semantic information in future work.

Originality/value

Baton, a service management system to explicitly resolve the particular issues stemming from smart spaces when coordinating agents is presented.

Details

International Journal of Pervasive Computing and Communications, vol. 5 no. 2
Type: Research Article
ISSN: 1742-7371

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