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Article

GEC is engaged on sensing research at two of its five major longer‐range research centres — the Hirst Research Centre at Wembley and the Marconi Research Centre at Great…

Abstract

GEC is engaged on sensing research at two of its five major longer‐range research centres — the Hirst Research Centre at Wembley and the Marconi Research Centre at Great Baddow in Essex. Tony Walkden, Manager of the Engineering Science Division and George Pritchard, Administration Manager, at the Hirst Research Centre talked to Jack Hollingum about the sensing work in the Engineering Physics Group at Wembley and its place in the company's overall research policy.

Details

Sensor Review, vol. 4 no. 2
Type: Research Article
ISSN: 0260-2288

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Article

W. Delbare, L. Vandam, J. Vandewege, J. Verbeke and M. Fitzgibbon

The paper describes a new electro‐optical board technology, based on the discrete wiring principle. Isolated copper wires are embedded in the circuit board to realise the…

Abstract

The paper describes a new electro‐optical board technology, based on the discrete wiring principle. Isolated copper wires are embedded in the circuit board to realise the electrical interconnections. Glass optical fibres are embedded to obtain optical interconnections. The technology allows for crossovers and for electrical and optical interconnections on one layer of interconnection. As the technology can be applied on the level of package or multichip module, circuit board and backpanel, it has the ability to offer a complete solution for chip to chip electrical and optical interconnections. The paper will describe the basic manufacturing technology of the boards. The benefits of the technology from a system designer's viewpoint will be addressed. The problem of coupling light in and out of the embedded optical fibres will be discussed and the realisation of a first on‐board optical link via embedded optical fibres will be described.

Details

Circuit World, vol. 18 no. 3
Type: Research Article
ISSN: 0305-6120

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Article

Chunlei Shao and Yang Zhao

The purpose of this paper is to study the dimensionless characteristics of a molten salt pump and propose an approach to carry out the modeling experiment by using water…

Abstract

Purpose

The purpose of this paper is to study the dimensionless characteristics of a molten salt pump and propose an approach to carry out the modeling experiment by using water instead of molten salts.

Design/methodology/approach

External characteristics of the pump were estimated by using the steady flow model and compared with the experimental results. By taking water as the working fluid, the pathlines in the volute of the model pump were validated by the results obtained of high-speed photography. According to the derived dimensionless characteristics of the molten salt pump, the modeling experimental schemes were proposed. Adopting the validated numerical simulation model, the performance of the molten salt pump was studied in detail.

Findings

The modeling experimental schemes designed according to the dimensionless characteristics are theoretically feasible. However, to carry out the experiment successfully, factors such as rotational speed, geometric size, flow rate and head should be taken into account. The flow in the pumps is similar under the similar operating condition and the external characteristics of the similar pump can be converted to each other. Compared with transporting water, the decline of the head and efficiency is within 5 per cent when the viscosity is lower than 0.01453 Pa · s. The pump is not suitable for running under the critical Reynolds number of 1.0 × 107.

Originality/value

The current work revealed the relationships among the dimensionless performances of a molten salt pump and proposed a critical Reynolds number ReQcr for the pump running.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 27 no. 9
Type: Research Article
ISSN: 0961-5539

Keywords

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Article

D.H. Hartman

Fundamental engineering limits to very high speed electronics switching systems are employed. These limitations are caused by packaging and interconnection constraints, as…

Abstract

Fundamental engineering limits to very high speed electronics switching systems are employed. These limitations are caused by packaging and interconnection constraints, as well as device switching speed. From the device viewpoint, reactive parasitics caused by the packaging/interconnection scenario are discussed. From the systems level perspective, overall delay, delay variance and power consumption are explored. The important problem of clock distribution in high speed synchronous digital systems is discussed. These limitations are then revisited with photonics implementation in mind. Comparisons are made between the electrical and photonic approaches. Some engineering limits to the photonic alternative are laid out.

Details

Microelectronics International, vol. 5 no. 2
Type: Research Article
ISSN: 1356-5362

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Article

Gary Davies and Isabel Olmedo-Cifuentes

This paper aims to identify a typology of corporate misconduct affecting trust; to test the relative ability of individual misconducts to reduce trust and; to explain…

Abstract

Purpose

This paper aims to identify a typology of corporate misconduct affecting trust; to test the relative ability of individual misconducts to reduce trust and; to explain differences in how individuals respond to corporate crises.

Design/methodology/approach

The main research design uses conjoint analysis. Respondents (n = 404) rated eight combinations of six types of misconduct, identified from prior work on trust as likely to reduce trust. Initial levels of trust were established by varying both country of origin and product type.

Findings

The importance ranking for the six types was consistent across most conditions, with “bending the law” and “not telling the truth” as the most salient and “acting unfairly” and “acting irresponsibly” as the least salient in damaging trust. The characteristics of the respondent influenced the effect size.

Practical implications

As loss of trust represents loss of reputation, understanding how and when the framing of misconduct damages trust is important in managing reputation risk. The impact of any report of misconduct can be moderated if attributed by a company, the media or the individual, to a type that is less damaging to trust.

Originality/value

This study adds to our understanding as to why individuals respond differently to corporate misconduct, and contributes to prior work on reputation damage. The typology of corporate misconduct developed and tested here offers a different framework for researchers and practitioners with which to explore loss of trust and to develop existing crisis communication theory.

Details

European Journal of Marketing, vol. 50 no. 7/8
Type: Research Article
ISSN: 0309-0566

Keywords

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Article

Ning Jing

This paper aims to propose a liquid level sensor with a multi-S-bend plastic optical fiber.

Abstract

Purpose

This paper aims to propose a liquid level sensor with a multi-S-bend plastic optical fiber.

Design/methodology/approach

The principle of liquid sensing used is based on the leakage of higher modes out of the fiber and repeated regeneration in the following bend sections. Therefore, a propagation loss was introduced in every bend section of the fiber with the loss depending on the refractive index of the environment.

Findings

Therefore, a continue shift in the liquid level can be detected by observing changes in the propagation loss of the fiber. The sensor features compactness and a flexible resolution.

Originality/value

Compared with the exited ones, the sensor has capability of continue liquid measurement and a greater measurement range.

Details

Sensor Review, vol. 39 no. 4
Type: Research Article
ISSN: 0260-2288

Keywords

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Article

Mohd Anwar Zawawi, Sinead O'Keffe and Elfed Lewis

The purpose of this paper is to provide a comparative review of intensity‐modulated fiber optic sensors with non‐optical sensors for health monitoring applications, from…

Abstract

Purpose

The purpose of this paper is to provide a comparative review of intensity‐modulated fiber optic sensors with non‐optical sensors for health monitoring applications, from the current research activities in the area.

Design/methodology/approach

A range of published research work in sensor design for four different health monitoring applications, including, lumbar spine bending, upper and lower limb motion tracking, respiration and heart rate monitoring, are presented and discussed in terms of their respective advantages and limitations.

Findings

This paper provides information on the various types of sensors applied into the health monitoring area. The sensing techniques of the fiber optic sensor for the stated applications are focused and compared in details to highlight their contributions.

Originality/value

A comparative review of published work is illustrated in an informative table content, to allow a clear idea of the current sensing approaches for health monitoring applications.

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Article

Narottam Yadav, Kaliyan Mathiyazhagan and Krishna Kumar

The purpose of this paper is to improve the yield of a particular model of a car windshield, as the organization faces losses due to poor performance and rejection.

Abstract

Purpose

The purpose of this paper is to improve the yield of a particular model of a car windshield, as the organization faces losses due to poor performance and rejection.

Design/methodology/approach

The Six Sigma DMAIC (define, measure, analyze, improve and control) methodology is used to reduce variation and defects in the process. It is a methodology based on data-driven and fact-based analysis to find out the root cause of the problem with the help of statistical analysis. A worst performing model is selected as a case study through the scoping tree. The preprocess, printing, bending and layup process defects are reduced by analyzing the potential causes and hypothesis testing.

Findings

This paper describes Six Sigma methodology in a glass manufacturing industry in India for automotive applications. The overall yield of a car windshield achieved 93.57 percent against the historical yield of 88.4 percent, resulting in saving 50 lacs per annum. Due to no rework or repairing in the glass, low first-time yield causes major losses. Process improvement through focused cross-functional team reduces variation in the process. Six Sigma improves profitability and reduces defects in the automotive glass manufacturing process.

Research limitations/implications

This case study is applied in automotive glass manufacturing industries. For service and healthcare industries, a similar type of study can be performed. Further research on the common type of processor industry would be valuable.

Practical implications

The case study can be used as a problem-solving methodology in manufacturing and service industries. The tools and techniques can be used in other manufacturing processes also. This paper is useful for industries, researchers and academics for understanding Six Sigma methodology and its practical implementation.

Originality/value

This case study is an attempt to solve automobile glass manufacturing problems through DMAIC approach. The paper is a real case study showing benefits of Six Sigma implementation in the manufacturing industry and saving an annual cost of 50 lacs due to rejections in the process.

Details

Journal of Advances in Management Research, vol. 16 no. 4
Type: Research Article
ISSN: 0972-7981

Keywords

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Article

Hua‐Peng Chen and Nenad Bicanic

The paper aims to identify both the location and severity of damage in complex framed buildings using limited noisy vibration measurements. The study aims to directly…

Abstract

Purpose

The paper aims to identify both the location and severity of damage in complex framed buildings using limited noisy vibration measurements. The study aims to directly adopt incomplete measured mode shapes in structural damage identification and effectively reduce the influence of measurement errors on predictions of structural damage.

Design/methodology/approach

Damage indicators are properly chosen to reflect both the location and severity of damage in framed buildings at element level for braces and at critical point level for beams and columns. Basic equations for an iterative solution procedure are provided to be solved for the chosen damage indicators. The Tikhonov regularisation method incorporating the L‐curve criterion for determining the regularisation parameter is employed to produce stable and robust solutions for damage indicators.

Findings

The proposed method can correctly assess the quantification of structural damage at specific locations in complex framed buildings using only limited information on modal data measurements with errors, without requiring mode shape expansion techniques or model reduction processes.

Research limitations/implications

Further work may be needed to improve the accuracy of inverse predictions for very small structural damage from noisy measurements.

Practical implications

The paper includes implications for the development of reliable techniques for rapid and on‐line damage assessment and health monitoring of framed buildings.

Originality/value

The paper offers a practical approach and procedure for correctly detecting structural damage and assessing structural condition from limited noisy vibration measurements.

Details

Engineering Computations, vol. 27 no. 8
Type: Research Article
ISSN: 0264-4401

Keywords

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Article

G. Stewart, B. Culshaw, W. Johnstone, G. Whitenett, K. Atherton and A. McLean

Describes the author's work on the development of fibre sensors and networks for monitoring trace gases such as methane, acetylene, carbon dioxide, carbon monoxide…

Abstract

Describes the author's work on the development of fibre sensors and networks for monitoring trace gases such as methane, acetylene, carbon dioxide, carbon monoxide, hydrogen sulphide and for detection of spills of gasoline, diesel and organic solvents, all of which are important in environmental and safety management. As an example, a 45‐point fibre optic sensor network has been installed on a landfill site to assess the distribution of methane generation across the site. System operation is based on near‐IR absorption and is currently being extended to monitor other gases such as carbon dioxide and hydrogen sulphide. Concurrently, research is being conducted on fibre lasers for the realisation of multi‐point, multi‐gas monitoring systems. Based on other principles (periodic micro‐bending loss effects), detection of hydrocarbon fuel spills has been demonstrated at multiple locations along the length of a specially designed fibre optic cable using standard optical time domain reflectometry (OTDR) measurements.

Details

Management of Environmental Quality: An International Journal, vol. 14 no. 2
Type: Research Article
ISSN: 1477-7835

Keywords

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