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Article
Publication date: 14 February 2019

Weishan Huang, Jing-Li Luo, Hani Henein and Josiah Jordan

This paper aims to evaluate the sulfide stress cracking (SSC) resistance of L80 casing steels with different alloying chemistries (e.g. Ti-B and Mn-Cr-Mo) by correlating…

Abstract

Purpose

This paper aims to evaluate the sulfide stress cracking (SSC) resistance of L80 casing steels with different alloying chemistries (e.g. Ti-B and Mn-Cr-Mo) by correlating the reduction in area ratio with the mechanical property, inclusion and carbide.

Design/methodology/approach

SSC tests were conducted in 5.0 Wt.% sodium chloride and 0.5 Wt.% acetic acid solution saturated with H2S using constant load tensile method. The microstructure and fracture morphology of the steel were observed using scanning electron microscope. The inclusion and carbide were identified by energy dispersive spectroscopy and auger electron microscope.

Findings

Among all the testing steels, electric resistance welding (ERW) L80-0.5Mo steel demonstrates the highest SSC resistance because of its appropriate mechanical properties, uniform microstructure and low inclusion content. The SSC resistance of L80 steels generally decreases with the rising yield strength. The fracture mode of steel with low SSC resistance is jointly dominated by transgranular and intergranular cracking, whereas that with high SSC resistance is mainly transgranular cracking. SSC is more sensitive to inclusions than carbides because the cracks are easier to be initiated from the elongated inclusions and oversized oxide inclusions, especially the inclusion clusters. Unlike the elongated carbide, globular carbide in the steel can reduce the negative effect on the SSC resistance. Especially, a uniform microstructure with fine globular carbides favors a significant improvement in SSC resistance through precluding the cracking propagation.

Originality/value

The paper provides the new insights into the improvement in SSC resistance of L80 casing steel for its application in H2S environment through optimizing its alloying compositions and microstructure.

Details

Anti-Corrosion Methods and Materials, vol. 66 no. 4
Type: Research Article
ISSN: 0003-5599

Keywords

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Article
Publication date: 1 January 2016

Wei Yan, Yong Xiang, Wenliang Li and Jingen Deng

This paper aims to establish the downhole CO2 partial pressure profile calculating method and then to make an economical oil country tubular goods (OCTG) anti-corrosion…

Abstract

Purpose

This paper aims to establish the downhole CO2 partial pressure profile calculating method and then to make an economical oil country tubular goods (OCTG) anti-corrosion design. CO2 partial pressure is the most important parameter to the oil and gas corrosion research for these wells which contain sweet gas of CO2. However, till now, there has not been a recognized method for calculating this important value. Especially in oil well, CO2 partial pressure calculation seems more complicated. Based on Dolton partial pressure law and oil gas separation process, CO2 partial pressure profile calculating method in oil well is proposed. A case study was presented according to the new method, and two kinds of corrosion environment were determined. An experimental research was conducted on N80, 3Cr-L80 and 13Cr-L80 material. Based on the test results, 3Cr-L80 was recommended for downhole tubing. Combined with the field application practice, 3Cr-L80 was proved as a safety and economy anti-corrosion tubing material in this oil field. A proper corrosion parameter (mainly refers to CO2 partial pressure and temperature) can ensure a safety and economy downhole tubing anti-corrosion design.

Design/methodology/approach

Based on Dolton partial pressure law and oil gas separation process, CO2 partial pressure profile calculating method in oil well is proposed. An experimental research was conducted on N80, 3Cr-L80 and 13Cr-L80 material. A field application practice was used.

Findings

It is necessary to calculate the CO2 partial pressure properly to ensure a safety and economy downhole tubing (or casing) anti-corrosion design.

Originality/value

The gas and oil separation theory and corrosion theory are combined together to give a useful method in downhole tubing anti-corrosion design method.

Details

Anti-Corrosion Methods and Materials, vol. 63 no. 5
Type: Research Article
ISSN: 0003-5599

Keywords

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Article
Publication date: 14 May 2020

Subhradip Mukherjee, R. Kumar and Siddhanta Borah

The purpose of this work is to propose quad wheel robot with path navigation using an intelligent novel algorithm named as obstacle-avoiding intelligent algorithm (OAIA).

Abstract

Purpose

The purpose of this work is to propose quad wheel robot with path navigation using an intelligent novel algorithm named as obstacle-avoiding intelligent algorithm (OAIA).

Design/methodology/approach

The paper proposes OAIA algorithm, which is used to minimize the path distance and elapsed time between source and goal.

Findings

The hardware implementation of the Quad Wheel Robot design includes a global positioning system (GPS) module for path navigation. An ultrasonic module (HC SR04) is mainly used as the sensing unit for the system. In the proposed scheme, the GPS locator (L80) is used to obtain the current location of the robot, and the ultrasonic sensor is utilized to avoid the obstacles. An ARM processor serves as the heart of the Quad Wheel Robot.

Practical implications

This paper includes real-time implementation of quad wheel robot for various coordinate values, and the movement of the robot is captured and analysed.

Originality/value

The proposed OAIA is capable of estimating the mobile robot position exactly under ideal circumstances. Simulation and hardware implementation are carried out to evaluate the performance of the proposed system.

Details

International Journal of Intelligent Unmanned Systems, vol. 9 no. 1
Type: Research Article
ISSN: 2049-6427

Keywords

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Article
Publication date: 29 June 2010

C. Miranda‐Herrera, I. Sauceda, J. González‐Sánchez and N. Acuña

The purpose of this paper is to evaluate the electrochemical behaviour of two carbon steels exposed to acidic geothermal solutions and their resistance to hydrogen induced…

Abstract

Purpose

The purpose of this paper is to evaluate the electrochemical behaviour of two carbon steels exposed to acidic geothermal solutions and their resistance to hydrogen induced cracking (HIC), in order to determine the effect of hydrogen damage on the failure process of the steels used for line pipe and casings at a geothermal plant.

Design/methodology/approach

Samples of two different steels: ASTM A‐53 Grade B (line pipe) and API L‐80 (casing) were immersed for a duration of 96 h in the electrolyte proposed by NACE to evaluate susceptibility to HIC. Samples of the two steels embedded in non‐conducting Bakelite were subjected to potentiodynamic polarisation scans at room temperature using as the electrolyte brines obtained from different wells at the Cerro Prieto geothermal plant. Hardness tests were performed on the samples before and after the HIC tests in order to determine hardness changes induced by hydrogen penetration as field results indicated embrittlement of the steels after four months of service.

Findings

The steels, ASTM A‐53 Grade B and API L‐80 did not exhibit crack sensitivity as no cracks are observed in the tests specimens, though they showed an increase in hardness. The steels exhibited high‐corrosion rates in the brine media at room temperature (3.3 mm/yr), which is expected to increase at higher temperatures.

Originality/value

The work revealed that carbon steels used for line pipes and casings at geothermal plants can exhibit high resistance to HIC, however they corrode at high rates and may show embrittlement. It is suggested that due to the high‐operation temperature, the damage induced by hydrogen resulted in hardness increase but was not sufficient to develop cracks.

Details

Anti-Corrosion Methods and Materials, vol. 57 no. 4
Type: Research Article
ISSN: 0003-5599

Keywords

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Article
Publication date: 1 March 1986

A new heat pump system, developed by Forward Ultrasonics and sister company KLN of Germany, is being used in the Fultra range of ultrasonic, free‐standing, two‐stage…

Abstract

A new heat pump system, developed by Forward Ultrasonics and sister company KLN of Germany, is being used in the Fultra range of ultrasonic, free‐standing, two‐stage cleaning machines. This not only gives large reductions in unit cost but improves the machine's efficiency which considerably reduces running costs.

Details

Circuit World, vol. 12 no. 4
Type: Research Article
ISSN: 0305-6120

Open Access
Article
Publication date: 10 June 2020

Javier Solano, Segundo Camino-Mogro and Grace Armijos-Bravo

Banks are institutions that inject money in the economy and help to boost it when there are problems in some markets, especially in productive sectors. In this way…

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1103

Abstract

Purpose

Banks are institutions that inject money in the economy and help to boost it when there are problems in some markets, especially in productive sectors. In this way, analysing the competition in this sector is an important tool for policymakers as non-competitive behaviour could affect the financial system and economy. The purpose of this paper is to measure the degree of competition in the Ecuadorian private banking sector divided by size, from 2000 to 2015, using panel data collected by the official regulator institution.

Design/methodology/approach

The authors applied the model proposed by Panzar and Rosse (1987) and its H-statistic using a reduced price and revenue equation estimated by pooled ordinary least squares, fixed effects, random effects, feasible generalised fixed effects and panel correction standard errors (PCSE).

Findings

The authors show that given the presence of some problems in data such as heteroskedasticity and autocorrelation, the most appropriate technique is PCSE. The authors also found robust evidence supporting that large banks compete in a monopolistic market, small and medium-sized banks operate in monopolistic competition, and Ecuadorian small, medium-sized and large banks stay in long-run equilibrium.

Originality/value

This paper contributes to the actual literature of competition degree in two ways. First, different from traditional papers, we do not control by size; so, we divided the analysis by size, because in Ecuador and also in many developing countries, bank’s competition is different for each group of size because the levels of liquidity, risk and other indicators are different from one group to another. Second, we show the robustness of the results using a scaled and unscaled equation, using many controls and using five methods to contrast the competition degree.

Details

Journal of Economics, Finance and Administrative Science, vol. 25 no. 50
Type: Research Article
ISSN: 2077-1886

Keywords

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Article
Publication date: 1 March 1990

J.C. VERITE

Problem 8 of the TEAM workshop comes from non‐destructive testing. A differential probe moves above a block with a crack. Three experimental and four numerical results are…

Abstract

Problem 8 of the TEAM workshop comes from non‐destructive testing. A differential probe moves above a block with a crack. Three experimental and four numerical results are presented and analysed. Some specific difficulties arising in this problem are discussed.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 9 no. 3
Type: Research Article
ISSN: 0332-1649

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Article
Publication date: 2 February 2021

Jianhua Zhang and Mohammad Shahidul Islam

The primary purpose of the study is to examine the role of market power in driving innovation and productivity of intangible intensive firms of eight emerging economies of…

Abstract

Purpose

The primary purpose of the study is to examine the role of market power in driving innovation and productivity of intangible intensive firms of eight emerging economies of the Association of Southeast Asian Nations (ASEAN-8).

Design/methodology/approach

There is hardly any study on emerging economies that explored the causal chain of R&D–innovation–productivity, considering the role of market power in a structural model. Taking advantage of the availability of firm-level data and following the extended version of the Crépon, Duguet and Mairesse (CDM) model, we intend to fill the gap. The CDM model first explores the link between R&D and innovation, then the latter's impact on productivity. Besides, it captures sectoral heterogeneity and the differing roles of technological and institutional innovation on productivity.

Findings

The manufacturing firms that held a higher markup had a more significant contribution to driving innovation than services one. While institutional innovation affected productivity positively, technological innovation had the opposite impact. Nevertheless, firms' higher degree of monopoly, in general, worsened productivity outcomes. The estimated results are robust to a range of alterations.

Practical implications

The study offers implications for the competition policy of ASEAN.

Originality/value

The sample of this study accounts for almost half of the world's best-performing emerging economies. Thus, the findings are likely to contribute to the thin literature on market power's role in driving innovation and productivity in the intangible economy of emerging markets.

Details

International Journal of Emerging Markets, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1746-8809

Keywords

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Article
Publication date: 23 June 2020

Francisco Trincado-Munoz, Leslier Valenzuela-Fernández and Melany Hebles

While companies have increasingly encouraged employees to adopt a customer orientation, less attention has been given to the impact that customer orientation has on…

Abstract

Purpose

While companies have increasingly encouraged employees to adopt a customer orientation, less attention has been given to the impact that customer orientation has on employees' job outcomes and performance. Previous research has used job demands-resource theory (JD-R) and proposed several mechanisms through which customer orientation influences performance, yet the intervening variables in the process have shown inconsistent results. The purpose of this paper is to investigate the contextual role of organizational justice on the relationship between customer orientation and performance through work engagement. In this way, offering more understanding of the contingent effects that intervene in the customer orientation–performance relationship.

Design/methodology/approach

Using a structural equation model (SEM) in a sample of 249 marketing, sales and management managers in Chilean companies, this paper tested different hypotheses concerning the role of work engagement, organizational justice and customer orientation in relation to perceived performance.

Findings

This study informs that organizational justice (procedural and distributive justice) moderates the relationship between customer orientation and performance through work engagement. Precisely, the findings reveal that at lower values of organizational justice, changes in customer orientation negatively influence work engagement and in turn performance.

Originality/value

The results contribute to strengthening customer orientation theory by integrating a contextual variable often omitted: organizational justice. By exploring the moderation effect of organizational justice on customer orientation, this paper reveals contingent effects of employees' perceived fairness on the organization in the relationship between customer orientation and performance through work engagement. The findings encourage managers to look after employees' perceived organizational justice when they implement customer-oriented approaches, in particular, of those employees who work in the frontline sales and service positions.

Propósito

Mientras las empresas han incentivado la adopción de una orientación al cliente por parte de los empleados, menos atención se ha dado al impacto que la orientación al cliente tiene en los resultados laborales y el desempeño. Investigación previa ha usado la teoría de Demandas y Recursos del Trabajo (Job Demands-Resource Theory en inglés) y propuesto varios mecanismos a través de los cuales la orientación al cliente tiene un efecto en el desempeño, no obstante las variables que intervienen en el proceso han mostrado resultados inconsistentes. Por tanto, este estudio tiene por objetivo investigar el rol contextual de justicia organizacional en la relación entre orientación al cliente y performance a través del compromiso organizacional. De esta manera, ofrecer mayor entendimiento de los efectos contingentes que intervienen la relación orientación al cliente-desempeño.

Diseño/metodología/enfoque

Usando un modelo de ecuaciones estructurales en una muestra de 249 ejecutivos de marketing, ventas y negocios en compañías chilenas, este estudio evalúa diferentes hipótesis respecto al rol del compromiso organizacional, justicia organizacional, y orientación al cliente en relación a la percepción del desempeño organizacional.

Hallazgos

Este estudio demuestra que la justicia organizacional (como justicia distributiva y procedural) modera la relación entre orientación al cliente y desempeño a través del compromiso organizacional. Precisamente, los resultados revelan que a menores valores de justicia organizacional, cambios en la orientación al cliente influencian negativamente el compromiso organizacional y a su vez el desempeño.

Originalidad/valor

Los resultados contribuyen a fortalecer la teoría de Orientación al Valor del Cliente integrando una variable contextual que a menudo ha sido omitida: Justicia organizacional. Explorando la moderación de la justicia organizacional en la orientación al cliente, esta investigación revela efectos contingentes de la percepción de justicia de los empleados en la organización en la relación entre orientación al cliente y el desempeño percibido a través del compromiso organizacional. Estos hallazgos invitan a los gerentes a preocuparse por la percepción de justicia de los empleados cuando deciden implementar la orientación al cliente en especial con quiénes trabajan en la provisión de servicios y atención a clientes.

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Article
Publication date: 6 June 2019

Joanne Roberts

Through a critical review of the impact of luxury international business, this study aims to contribute to an understanding of business activities that depend on an…

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Abstract

Purpose

Through a critical review of the impact of luxury international business, this study aims to contribute to an understanding of business activities that depend on an unequal distribution of income and wealth.

Design/methodology/approach

Drawing on a wide range of academic and practitioner literature, this study adopts a critical luxury studies approach to provide an assessment of the economic and social impact of luxury international business.

Findings

Luxury is an increasingly important sector of the economy, which contributes to the welfare of increasing numbers of people across the world. Alongside its dependence on an unequal distribution of income and wealth and the negative aspects to which this gives rise, luxury business generates significant benefits to the economy and society through promoting economic growth, innovation, cultural enrichment, improved quality of the built environment and environmentally sustainable business practices. Nevertheless, an appropriate level of regulation and taxation on the excesses of contemporary luxury consumption could improve the welfare of all. Hence, luxury international business warrants investigation by critical scholars who recognize the complexity of the benefits and dark sides arising from luxury.

Research limitations/implications

This study draws on an extensive review of academic and practitioner literature. However, primary research is required to investigate further the key issues identified.

Social implications

Through an exploration of the impact of the production and consumption of luxury, this study reveals how luxury businesses serving the super-rich can contribute to the welfare of society whilst also giving rise to negative outcomes.

Originality/value

By adopting a critical luxury studies approach, this study offers an original contribution to the field of international business and introduces avenues for future critical international business research.

Details

critical perspectives on international business, vol. 15 no. 2/3
Type: Research Article
ISSN: 1742-2043

Keywords

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