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Article
Publication date: 1 March 1991

T. Tobita, K. Niki, T. Makita, H. Takasago and H. Miki

To obtain the best moisture‐proof and most reliable protective coating for an amorphous silicon image sensor (A4 documents), three methods of coating and patterning…

Abstract

To obtain the best moisture‐proof and most reliable protective coating for an amorphous silicon image sensor (A4 documents), three methods of coating and patterning processes and 15 types of resin classified into five kinds of materials were evaluated. Through this study, a screen‐printing method using silicone resin material cured under conditions of 150°C for 60 minutes to form a 60 µm thick protective coating film was selected because of the simplicity of its fabrication process compared with the other two methods. The a‐Si photodiodes were tested under conditions of 121°C‐2 atm. for 300 hours, −30°C to 100°C for 350 cycles and 85°C for 500 hours, and their characteristics were not negatively affected.

Details

Microelectronics International, vol. 8 no. 3
Type: Research Article
ISSN: 1356-5362

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Article
Publication date: 28 October 2013

Sumitaka Ushio and Yasuyuki Kazusa

– This paper aims to examine the processes through which accounting calculations are formed and developed in a Japanese manufacturing company.

Abstract

Purpose

This paper aims to examine the processes through which accounting calculations are formed and developed in a Japanese manufacturing company.

Design/methodology/approach

The paper is based on an in-depth longitudinal case study. Actor network theory is used to analyze the empirics and to trace the historical translation process where the calculations were formed and developed as inscriptions.

Findings

The empirics show that an accounting calculation (called PPH) was formed and developed as a flag to rally around to involve different interests at different times. It translated changing external social and economic contexts as well as internal managerial and shop-floor interests into its calculations at different stages of the company's development. The processes were inscribed in the form of an accounting calculation and these inscriptions were accumulated, rather than replaced or abandoned, to create growth rings of accounting calculations as chronological network effects.

Originality/value

The case in this paper demonstrates that keiei-rinen (management philosophy) control can be more bottom-up than implied in the extant literature. Shop-floor workers and non-accounting experts participate in (re)shaping processes of accounting calculations. In these processes, “stability” is the key for the calculations to remain at the centre of translation attracting various interests and linking different demands over time.

Details

Journal of Accounting & Organizational Change, vol. 9 no. 4
Type: Research Article
ISSN: 1832-5912

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Article
Publication date: 1 January 1992

T. Tobita, K. Niki, K. Inouye and H. Takasago

Advanced laser micromachining techniques for a TFT‐LCD (thin film transistor‐liquid crystal display) module have been developed to repair various kinds of defects such as…

Abstract

Advanced laser micromachining techniques for a TFT‐LCD (thin film transistor‐liquid crystal display) module have been developed to repair various kinds of defects such as shorts, opens, and degraded TFTs. They have also been designed to analyse failures in the TFT‐LCD. The techniques are as follows: (i) The technique of zapping the excess metal: to repair short defects and/or to isolate the TFT being tested from the adjacent TFTs. This uses a pulse Xe or a Q‐switched YAG laser. (ii) Zapping, followed by the metal deposition technique: to repair open defects and/or to form electrical testing electrodes. This uses a Q‐switched YLF and an Ar ion laser. (iii) The technique of micro‐welding two metal lines separated by an insulating layer: to repair open defects. This uses a Q‐switched YAG laser. (iv) A separation technique utilised on a TFT‐LCD panel adhered with epoxy resin. This uses a pulse Excimer laser. (v) A micro‐annealing technique for a degraded TFT: to recover the TFT characteristics. This uses a Q‐switched YAG laser. Through the study described above, the authors have confirmed that these techniques are highly effective for obtaining TFT‐LCD modules without defects. The yield of TFT‐LCD modules may therefore be expected to improve.

Details

Microelectronics International, vol. 9 no. 1
Type: Research Article
ISSN: 1356-5362

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Article
Publication date: 4 July 2016

Adam Okninski, Jan Kindracki and Piotr Wolanski

Today’s modern liquid propellant rocket engines have a very complicated structure. They cannot be arbitrarily downsized, ensuring efficient propellants’ mixing and…

Abstract

Purpose

Today’s modern liquid propellant rocket engines have a very complicated structure. They cannot be arbitrarily downsized, ensuring efficient propellants’ mixing and combustion. Moreover, the thermodynamic cycle’s efficiency is relatively low. Utilizing detonation instead of deflagration could lead to a significant reduction of engine chamber dimensions and mass. Nowadays, laboratory research is conducted in the field of rotating detonation engine (RDE) testing worldwide. The aim of this paper is to cover the design of a flight demonstrator utilizing rocket RDE technology.

Design/methodology/approach

It presents the key project iterations made during the design of the gaseous oxygen and methane-propelled rocket. One of the main goals was to develop a rocket that could be fully recoverable. The recovery module uses a parachute assembly. The paper describes the rocket’s main subsystems. Moreover, vehicle visualizations are presented. Simple performance estimations are also shown.

Findings

This paper shows that the development of a small, open-structure, rocket RDE-powered vehicle is feasible.

Research limitations/implications

Flight propulsion system experimentation is on-going. However, first tests were conducted with lower propellant feeding pressures than required for the first launch.

Practical implications

Importantly, the vehicle can be a test platform for a variety of technologies. The rocket’s possible further development, including educational use, is proposed.

Originality/value

Up-to-date, no information about any flying vehicles using RDE propulsion systems can be found. If successful in-flight experimentation was conducted, it would be a major milestone in the development of next-generation propulsion systems.

Details

Aircraft Engineering and Aerospace Technology: An International Journal, vol. 88 no. 4
Type: Research Article
ISSN: 1748-8842

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Article
Publication date: 1 April 2005

Andrzej Dziedzic, Edward Mis, Lars Rebenklau and Klaus‐Jurgen Wolter

This paper aims to present systematic studies of a wide spectrum of geometrical and electrical properties of thick‐film and LTCC microresistors (with designed dimensions…

Abstract

Purpose

This paper aims to present systematic studies of a wide spectrum of geometrical and electrical properties of thick‐film and LTCC microresistors (with designed dimensions between 50 × 50 μm2 and 800 × 200 μm2).

Design/methodology/approach

The geometrical parameters (average length, width and thickness, relations between designed and real dimensions, distribution of planar dimensions) are correlated with basic electrical properties of resistors (sheet resistance and its distribution, hot temperature coefficient of resistance and its distribution distribution) as well as long term thermal stability and durability of microresistors to short electrical pulses.

Findings

Fodel process gives better resolution than standard screen‐printing and leads to smaller dimensions than designed, smaller absolute error and better uniformity of planar sizes. Microresistors made in full Fodel process show much weaker dimensional effect and exhibit noticeably smaller distribution of basic electrical properties.

Originality/value

Presents systematic studies of a wide spectrum of geometrical and electrical properties of thick‐film and LTCC microresistors.

Details

Microelectronics International, vol. 22 no. 1
Type: Research Article
ISSN: 1356-5362

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Article
Publication date: 1 March 1986

Brian Waterfield, G. Kersuzan and Boguslaw Herod

The Benelux chapter has made a habit of organising meetings with a scientific and commercial accent more or less alternately. This approach has proven to be successful in…

Abstract

The Benelux chapter has made a habit of organising meetings with a scientific and commercial accent more or less alternately. This approach has proven to be successful in the past three years. The 1986 Autumn meeting will be another display meeting. A number of papers will be presented by suppliers of materials and equipment for the hybrid and surface mounting industry. In a 300 m2 exhibition room about 25 companies will display their products. The programme of the day leaves ample opportunity for meeting colleagues and suppliers. The meeting will be held in the ‘Jaarbeurs Vergadercentrum’ in Utrecht on 16 October from 9.30–17.00. The annual ISHM‐Benelux general membership meeting will precede the lectures.

Details

Microelectronics International, vol. 3 no. 3
Type: Research Article
ISSN: 1356-5362

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Article
Publication date: 4 January 2021

Vikram Kumar and Srivastava Granthi

The purpose of this study is to understand the basics of interactions of groundwater and surface water, which is needed for effective management of water resources.

Abstract

Purpose

The purpose of this study is to understand the basics of interactions of groundwater and surface water, which is needed for effective management of water resources.

Design/methodology/approach

The experimental setup was framed using curved flume and the straight flume, which simulates the model of river and groundwater storage, respectively. The model set up further consists, downstream, central and upstream sections where 14 observation wells, which are arranged at a measured distance from the canal side.

Findings

Exit gradient is higher at downstream when the average head differences between canal and river are 31.9 cm and 35.7 cm. Free seepage height is more in the downstream wells than upstream and central wells. At the downstream section, there is a greater chance of instability of the riverbank.

Research limitations/implications

Results will be used for better planning of hydraulic structural design.

Practical implications

Results will help in storing the large water and better irrigation planning for the water acute states and locations.

Originality/value

The originality is own developed physical model and its own first type to understand the basic of interaction and effects.

Details

World Journal of Engineering, vol. 18 no. 3
Type: Research Article
ISSN: 1708-5284

Keywords

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Article
Publication date: 1 August 2003

Y. Srinivasa Rao and M. Satyam

The effect of high voltage pulses on the resistance of polymer thick film resistors (PTFR) is studied. It is found that the resistance decreases with both the amplitude…

Abstract

The effect of high voltage pulses on the resistance of polymer thick film resistors (PTFR) is studied. It is found that the resistance decreases with both the amplitude and duration of the high voltage pulses and with the number of pulses. The change in resistance is attributed to the dielectrophoretic motion of graphite granules in the PVC medium when high voltage pulses are applied to PTFR. A model has been proposed through which the percentage change in resistance can be estimated in terms of the number of pulses, duration of pulses etc. Based on these investigations, we suggest a downward trimming method for PTFR through the application of high voltage pulses. This method of trimming is a clean process and trimmed resistors are free from hot spots.

Details

Microelectronics International, vol. 20 no. 2
Type: Research Article
ISSN: 1356-5362

Keywords

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Article
Publication date: 3 September 2021

Miwa Tobita, Hamed Eskandari and Tetsuji Matsuo

The authors derive a nonlinear MOR based on the Cauer ladder network (CLN) representation, which serves as an application of the parameterized MOR. Two parametrized CLN…

Abstract

Purpose

The authors derive a nonlinear MOR based on the Cauer ladder network (CLN) representation, which serves as an application of the parameterized MOR. Two parametrized CLN representations were developed to handle the nonlinear magnetic field. Simulations using the parameterized CLN were also conducted using an iron-cored inductor model under the first-order approximation.

Design/methodology/approach

This work studies the effect of parameter variations on reduced systems and aims at developing a general formulation for parametrized model order reduction (MOR) methods with the dynamical transition of parameterized state.

Findings

Terms including time derivatives of basis vectors appear in nonlinear state equations, in addition to the linear network equations of the CLN method. The terms are newly derived by an exact formulation of the parameterized CLN and are named parameter variation terms in this study. According to the simulation results, the parameter variation terms play a significant role in the nonlinear state equations when reluctivity is used, while they can be neglected when differential reluctivity is used.

Practical implications

The computational time of nonlinear transient analyses can be greatly reduced by applying the parameterized CLN when the number of time steps is large.

Originality/value

The authors introduced a general representation for the dynamical behavior of the reduced system with time-varying parameters, which has not been theoretically discussed in previous studies. The effect of the parameter variations is numerically given as a form of parameter variation terms by the exact derivation of the nonlinear state equations. The influence of parameter variation terms was confirmed by simulation.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering , vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0332-1649

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Article
Publication date: 23 February 2010

Jean‐Pierre Bardet and Fang Liu

This paper aims to improve post‐earthquake reconnaissance (PER) and online sharing of scientific and engineering information from earthquakes and natural disasters by…

Abstract

Purpose

This paper aims to improve post‐earthquake reconnaissance (PER) and online sharing of scientific and engineering information from earthquakes and natural disasters by taking full advantage of recent advances in information technologies, global positioning systems (GPS) and digital cameras.

Design/methodology/approach

Based on more than ten years of experience, this paper reviews the evolution of post‐earthquake reconnaissance after earthquakes in Japan, Turkey, Taiwan, India and China. In the anticipation of an explosion of information in this field, it proposes virtual earthquakes as a means to organise information collected from the metadata embedded in digital pictures.

Findings

Post‐earthquake reconnaissance has improved our knowledge of earthquakes in engineering and science. It has rapidly evolved with advances in GPS, digital cameras and web technologies. PER should now exploit the benefits of metadata embedded in photos. By attaching information to photo files, embedded metadata have the potential of automating and scaling up PER dataflow. Embedded metadata may lay the foundation of virtual earthquakes and involve the public in collecting scientific and engineering data.

Originality/value

The paper introduces the use of embedded metadata in the field of post‐earthquake reconnaissance for sharing of scientific and engineering data. The paper also contributes to building virtual earthquakes for visualising and understanding earthquake damage and other disasters affecting people and the built environment.

Details

Online Information Review, vol. 34 no. 1
Type: Research Article
ISSN: 1468-4527

Keywords

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