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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: 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: 1 January 1993

B. De Meulemeester, A. Van Calster, A. De Bruycker and K. Allaert

Since the first appearance of high density interconnection systems about ten years ago, researchers have tried to exploit this concept to the full. By introducing new…

Abstract

Since the first appearance of high density interconnection systems about ten years ago, researchers have tried to exploit this concept to the full. By introducing new technologies and materials, they have succeeded in building a module that equals wafer scale integration (WSI) in speed and efficiency. However, MCMs have not yet experienced rapid growth and acceptance as a result of the large capital investment and rather small volumes involved. This paper sets out to show that MCMs can be fabricated using technology and processes already in existence at most conventional IC and thin‐film production facilities.

Details

Microelectronics International, vol. 10 no. 1
Type: Research Article
ISSN: 1356-5362

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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: 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

Keywords

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Article
Publication date: 5 May 2015

Busi Rambabu and Y. Srinivasa Rao

The purpose of this paper is to study high-voltage interactions in polymer thick-film resistors, namely, polyvinyl chloride (PVC)-graphite thick-film resistors, and their…

Abstract

Purpose

The purpose of this paper is to study high-voltage interactions in polymer thick-film resistors, namely, polyvinyl chloride (PVC)-graphite thick-film resistors, and their applications in universal trimming of these resistors.

Design/methodology/approach

The authors applied high voltages in the form of pulses and impulses of various pulse durations and with different amplitudes to polymer thick-film resistors and observed the variation of resistance of these resistors with high voltages.

Findings

The paper finds that high voltages can be used for trimming of polymer thick-film resistors in both directions, i.e. upwards and downwards.

Research limitations/implications

The research implication of this paper is that polymer thick-film resistors can be trimmed downwards or upwards practically using this method.

Practical implications

The practical implications of this paper is that one can trim the polymer thick-film resistors, namely, PVC–graphite thick-film resistors, in both directions, i.e. upwards and downwards, by using this method.

Originality/value

The value of the paper is in showing that high voltages can be used to trim downwards and also upwards in the case of polymer thick-film resistors. This type of trimming is called universal trimming, developed first time for polymer thick-film resistors.

Details

Microelectronics International, vol. 32 no. 2
Type: Research Article
ISSN: 1356-5362

Keywords

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Article
Publication date: 1 April 1985

K. Fujita, T. Ito and K. Okada

Although much research work has been performed on the liquid sloshing inside simple cylindrical vessels, this paper deals with the analysis of the liquid sloshing in the…

Abstract

Although much research work has been performed on the liquid sloshing inside simple cylindrical vessels, this paper deals with the analysis of the liquid sloshing in the annular region of more intricate coaxial circular cylinders. In this analysis, by utilizing the velocity potential theory, the transient response was formulated as a boundary value problem in the axisymmetrical vessels when the sine wave in resonance with the sloshing of the primary mode was applied.

Details

Engineering Computations, vol. 2 no. 4
Type: Research Article
ISSN: 0264-4401

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Book part
Publication date: 30 September 2021

Kazuko Suzuki

Du Bois's interest in the Japanese empire points us in the direction of examining non-Western imperial policies and discourses and how they relate to racialization. For Du…

Abstract

Du Bois's interest in the Japanese empire points us in the direction of examining non-Western imperial policies and discourses and how they relate to racialization. For Du Bois, Japan was an exemplar of a nonwhite empire. This chapter reconstructs a Du Boisian conception of race that identifies it closely with ethnicity, against the belief that the African-American intellectual held on to a merely biological conception of race. I argue that his thought evolved towards a social-construction approach in which race must be understood historically and in particular global contexts. By analyzing Japan's policies and discourses around the boundaries of the Japanese, I explicate how Japan carried out a process of self-racialization owing to its dialectical relationship with the West. It also racialized its colonial subjects in a process of in-group delineation according to Japan's imperial imperatives. The case of the Japanese empire demonstrates how a global/transnational approach to racialization is valuable. It also evinces how white supremacy and universalism are not the only logics of imperialism. Moreover, it shows that Du Bois believed white supremacy could be transcended. However, Du Bois was too idealistic about Japan's empire, ignoring how oppressive nonwhite imperial rulers can be toward their subjects even when there are phenotypical similarities between them.

Details

Global Historical Sociology of Race and Racism
Type: Book
ISBN: 978-1-80117-219-6

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Article
Publication date: 1 February 1985

H.N. Seelye and J.A. Sween

Based on a survey of 136 successful Japanese quality control circles (QC Circles), six underlying QC circle dimensions are identified through factor analysis. The surveyed…

Abstract

Based on a survey of 136 successful Japanese quality control circles (QC Circles), six underlying QC circle dimensions are identified through factor analysis. The surveyed industries were categorised into four types: automotive/steel; other manufacturing; construction; retail/service. All circle dimensions except one (techniques of data collection and analysis used by the circles) differ significantly across industry type. This finding suggests that quality circles planning, implementation, and evaluation may encounter industry‐specific characteristics that need to be taken into account.

Details

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

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Article
Publication date: 13 September 2011

Zhong Zhou and Zhigao Chen

Based on definition and characteristic analysis, this paper seeks to propose a formation mechanism of knowledge rigidity, which is constituted by the effects of three

Abstract

Purpose

Based on definition and characteristic analysis, this paper seeks to propose a formation mechanism of knowledge rigidity, which is constituted by the effects of three precipitating factors: time‐effectiveness of knowledge, reinforcing effectiveness, and sunk cost effect in knowledge selection mechanism.

Design/methodology/approach

By presenting knowledge time‐effectiveness model, reinforcing effectiveness model, and knowledge selection mechanism, the paper theoretically analyzes firms' rigid behavior of knowledge application. Theories of increasing returns and sunk cost are introduced to explain the formation process of knowledge rigidity in firms. Two cases are presented to analyze the knowledge rigidity in industrial firms basing on the proposed models and mechanism.

Findings

First, the lifecycle of knowledge rigidity is dynamically defined by knowledge time‐effectiveness. Second, the degree of rigidity and firm's dependence on specific knowledge are enhanced by reinforcing effectiveness during the process of application. At the end of the life cycle, the sunk cost mainly hinders a firm's decision making to replace ineffective knowledge.

Research limitations/implications

Quantitative research is needed to further explore the formation mechanism of knowledge rigidity and to present operational approaches for practitioners. The proposed models and mechanism are useful for understanding the knowledge rigidity and analyzing its formation mechanism in firms.

Practical implications

This paper provides theoretical support to realize knowledge rigidity in KM practice. Three indicators were proposed to evaluate the rigidity and action suggestions were given to help control knowledge rigidity in firms.

Originality/value

Causal analysis models and a formation mechanism are proposed to show how knowledge rigidity forms.

1 – 10 of 14