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Article
Publication date: 30 July 2019

Dongfang Yang, Vladimir Pankov, Linruo Zhao and Prakash Patnaik

Accurate measurements of the temperature distributions in hot section components are indispensable for the prognostic and health management of gas turbines. Thin film thermocouple…

Abstract

Purpose

Accurate measurements of the temperature distributions in hot section components are indispensable for the prognostic and health management of gas turbines. Thin film thermocouple (TFTC) sensors, directly fabricated on the surface of a component, add negligible mass and create little or no disturbance to airflow, and therefore, can provide accurate measurements of fast temperature fluctuations of gas turbines. The purpose of this paper is to evaluate TFTC sensors fabricated by combining pulsed laser deposition (PLD) and micromachining techniques (LM).

Design/methodology/approach

The “dry” PLD/LM fabrication approach allows for excellent control of the chemical composition and physical characteristics of the constituent layers and their interfaces, thus achieving good adhesion of the layers to the substrate.

Findings

The results of thermal cyclic durability testing of the fabricated TFTC sensors demonstrated that the proposed PLD-based approach can be used to fabricate sensors that are fully functional at temperatures up to 750°C. Analyses of the sensor performance during durability testing revealed: the existence of a threshold temperature below which accurate temperature measurements were achieved; an abrupt drop in the sensor output occurring when the sensor temperature exceeded the threshold value, with a fast recovery of the sensor output once the temperature was reduced below the threshold level; and sensor “training” capable of increasing the threshold value of the TFTC through its exposure to above-the-threshold temperatures.

Originality/value

The work is the first time to demonstrate that simple PLD and LM processes can be used to fabricate TFTC that are fully functional at temperatures up to 750°C.

Details

Aircraft Engineering and Aerospace Technology, vol. 92 no. 1
Type: Research Article
ISSN: 1748-8842

Keywords

Executive summary
Publication date: 11 October 2016

RUSSIA: Plan to expand Syrian base fits Moscow's aims

Details

DOI: 10.1108/OXAN-ES214229

ISSN: 2633-304X

Keywords

Geographic
Topical
Book part
Publication date: 28 June 2016

Irina Paladi and Pierre Fenies

The purpose of this chapter is to provide a comprehensive review of empirical research on performance management (PM) in former communist Central and Eastern European (CEE…

Abstract

Purpose

The purpose of this chapter is to provide a comprehensive review of empirical research on performance management (PM) in former communist Central and Eastern European (CEE) countries, to evaluate the state of knowledge in this area and suggest possible directions for future research.

Methodology/approach

An examination of the literature was undertaken to review the empirical studies treating on PM in ex-communist countries from CEE. A total of 96 journal articles, PhD thesis, and conference papers were identified, categorized, and analyzed according to research questions, methodology, and theoretical framework. Contributions are classified by countries, according to progress in transition process (post-transition/transition countries) and membership in the Soviet Union (Soviet/non-Soviet countries). The review examines publications in four languages (English, French, Romanian, and Russian).

Findings

The literature review identified various stages of development of PM research and practice in the different groups of CEE countries.

In post-transition CEE countries, PM research follows the trends settled up in the developed countries (quantitative studies examining the extent of usage of different PM tools, influence of contingent factors, relationship PM-strategy, and impact on company’s performance). Also, the findings illustrate the modernization of PM practices: increasing importance of nonfinancial indicators and integrated performance management systems (PMS), although financial indicators are prevailing.

On the contrary, in transition countries PM research and practices are at an early stage, the reviewed literature highlights some specific issues related to transition context: the dynamic aspect of PM, change management, importance of informal systems, cultural aspects, and business traditions.

Research limitations

Because of the large number of CEE countries and the diversity of their national languages, many studies conducted in native languages have not been addressed in this literature review, which is essentially based on publications in English and French. Only for three CEE countries (Russia, Romania, and Moldova) publications in national language were considered.

Practical implications

This literature review may be useful for practitioners, providing insights on the extent of diffusion and usage of different PM tools and identifying difficulties and pitfalls to avoid in their implementation.

Originality/value

The chapter represents one of the first contributions to the knowledge about PM research and practice in former communist CEE countries. The adopted framework for reviewing and classifying the literature allows identifying the differences in PM research and practices between post-transition/transition and Soviet/non-Soviet countries.

Details

Performance Measurement and Management Control: Contemporary Issues
Type: Book
ISBN: 978-1-78560-915-2

Keywords

Expert briefing
Publication date: 16 March 2016

Putin announced on March 14 that the air campaign has achieved most of its objectives and paved the way for a peace deal. His officials have made it clear that some aircraft will…

Details

DOI: 10.1108/OXAN-DB209998

ISSN: 2633-304X

Keywords

Geographic
Topical
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