Search results

1 – 10 of over 1000
Click here to view access options
Article
Publication date: 6 March 2017

Ru Zhao, Da-Hai Xia, Shi-Zhe Song and Wenbin Hu

This paper aims to investigate the stress corrosion cracking (SCC) process of sensitized 304 stainless steel during the slow strain rate test by using the electrochemical…

Abstract

Purpose

This paper aims to investigate the stress corrosion cracking (SCC) process of sensitized 304 stainless steel during the slow strain rate test by using the electrochemical noise (EN) technique.

Design/methodology/approach

EN data are interpreted based on chaos and wavelet analyses, and correlation dimension and wavelet energy distribution are used as indicators for SCC process identification.

Findings

Experimental results reveal that the corrosion potential abruptly decreases from 180 to 100 mV at 6,300 s and the current increases from 10 to 100 nA accordingly, which is attributed to passive film breakdown and crack initiation. Chaos and wavelet analyses results reveal that, as crack initiates, the correlation dimensions increase from 1.2 to 1.9, and the corresponding distribution frequencies of maximum relative wavelet energy change from high frequency to low frequency.

Originality/value

SCC is monitored in lab, and crack initiation and propagation are identified by chaos and wavelet analyses. This work lays the foundation for SCC detection in field using EN.

Details

Anti-Corrosion Methods and Materials, vol. 64 no. 2
Type: Research Article
ISSN: 0003-5599

Keywords

Click here to view access options
Article
Publication date: 11 June 2018

Abdesselem Beghriche and Azeddine Bilami

Security is one of the major challenges in the design and implementation of protocols for mobile ad hoc networks (MANETs). In such systems, the cooperation between nodes…

Abstract

Purpose

Security is one of the major challenges in the design and implementation of protocols for mobile ad hoc networks (MANETs). In such systems, the cooperation between nodes is one of the important principles being followed in the current research works to formulate various security protocols. Many existing works assume that mobile nodes will follow prescribed protocols without deviation. However, this is not always the case, because these networks are subjected to a variety of malicious attacks. Since there are various models of attack, trust routing scheme can guarantee security and trust of the network. The purpose of this paper is to propose a novel trusted routing model for mitigating attacks in MANETs.

Design/methodology/approach

The proposed model incorporates the concept of trust into the MANETs and applies grey relational analysis theory combined with fuzzy sets to calculate a node’s trust level based on observations from neighbour nodes’ trust level, these trust levels are then used in the routing decision-making process.

Findings

In order to prove the applicability of the proposed solution, extensive experiments were conducted to evaluate the efficiency of the proposed model, aiming at improving the network interaction quality, malicious node mitigation and enhancements of the system’s security.

Originality/value

The proposed solution in this paper is a new approach combining the fundamental basics of fuzzy sets with the grey theory, where establishment of trust relationships among participating nodes is critical in order to enable collaborative optimisation of system metrics. Experimental results indicate that the proposed method is useful for reducing the effects of malicious nodes and for the enhancements of system’s security.

Details

International Journal of Intelligent Computing and Cybernetics, vol. 11 no. 2
Type: Research Article
ISSN: 1756-378X

Keywords

Click here to view access options
Article
Publication date: 8 March 2011

Song Zhu and Donglin Xia

China's securities market is growing gradually as well as the investors, analysts, intermediates and regulation authorities. Accounting earnings is a key determinant among…

Downloads
2361

Abstract

Purpose

China's securities market is growing gradually as well as the investors, analysts, intermediates and regulation authorities. Accounting earnings is a key determinant among the factors influencing stock prices, which even overreacts to earnings. Split‐stock reform (all‐circulation reform) in China provides a chance for investors to revaluate the stock prices. The purpose of this paper is to investigate the market reaction during the reform from the perspective of accounting conservatism.

Design/methodology/approach

Using the data of companies completing the split‐stock reform, this paper empirically investigates how the accounting conservatism influences the market reaction around re‐open day after the reform.

Findings

Accounting information plays its role on stock pricing through the reform of split‐stock reform in the China securities market, evident in the significantly positive relation between the proxies of accounting conservatism and cumulative abnormal returns for one day, three days, ten days and 30 days around re‐open day after the reform. Also, the profitability of listed firms in the past will further improve the positive relation between conservatism and market reaction.

Originality/value

There is ample theoretical work on stock pricing of accounting conservatism but empirical work is scarce, so this paper provides more evidence for the role of stock pricing of accounting conservatism, especially in emerging markets. Second, current research on accounting conservatism in China is focusing on whether conservatism exists and how the conservatism varies; this paper further extends the research field of conservatism from the pricing perspective. Third, researches based on the determinants of stock compensation and market reaction on stock reform lack theoretical analysis, while this paper provides a theory basis for the market reaction during the stock reform.

Details

Nankai Business Review International, vol. 2 no. 1
Type: Research Article
ISSN: 2040-8749

Keywords

Click here to view access options
Article
Publication date: 17 March 2016

Xia Zhu and Judy Zolkiewski

This study investigates service adaptation in a business-to-business context and explores the characteristics of service adaptation and how it takes place in…

Downloads
1647

Abstract

Purpose

This study investigates service adaptation in a business-to-business context and explores the characteristics of service adaptation and how it takes place in business-to-business markets.

Design/methodology/approach

Two case studies were employed to obtain both suppliers’ and customers’ perceptions of service adaptation in a business-to-business context.

Findings

The findings captured both suppliers’ and customers’ adaptation in a business-to-business service context. It revealed customers’ active adaptation in assisting suppliers in the business-to-business service process. Suppliers’ willingness to make adaptation appears to have an impact on their relationships with customers. Business-to-business service adaptation is a dynamic and interactive process.

Research limitations/implications

The findings shed light for practitioners not to neglect customers’ active participation, but to understand customers’ role in making adaptation with suppliers in the service process to enhance their service experience and business-to-business relationships. The research is exploratory and the findings of these two case studies may be influenced by the manufacturing sector in which the case study firms are based.

Originality/value

This paper illustrates that the interactive nature of service adaptation is particularly pertinent in a business-to-business context and that the phenomena needs much more careful attention as it provides a potential area for marketing managers to achieve service differentiation.

Details

Journal of Service Theory and Practice, vol. 26 no. 3
Type: Research Article
ISSN: 2055-6225

Click here to view access options
Article
Publication date: 21 November 2018

Deepak Kumar, Yajvender Pal Verma and Rintu Khanna

Technological development has not only helped in effective integration of renewable sources but also made it possible for consumers to participate in system operation…

Abstract

Purpose

Technological development has not only helped in effective integration of renewable sources but also made it possible for consumers to participate in system operation. Different market players are coming up in the electricity market, microgrid being one of them. Thus, this paper aims to investigate consumers’ role in the dispatch of a microgrid system that has a hybrid market structure under varied system conditions.

Design/methodology/approach

The mathematical model developed has been solved by the CONOPT solver in the GAMS optimization tool. GAMS-MATLAB interfacing is done to obtain solutions.

Findings

The problem formulated shows the effect of consumers in dispatch and overall operational cost. Consumers’ participation has been proposed through a quadratic cost function. The system operation under pool and bilateral contracts has been investigated. It shows that proper incentives to the consumers can help in reduction and effective management of the demand, carbon emission and overall system operational cost.

Originality/value

This paper considers the hybrid market structure to find the load dispatch in a microgrid system. The participation of consumers in the microgrid system has been implemented considering variations in wind power, solar power and load. The power exchange between the grid and microgrid system has been modeled showing the contribution of the consumers in system operation.

Details

International Journal of Energy Sector Management, vol. 13 no. 2
Type: Research Article
ISSN: 1750-6220

Keywords

Click here to view access options
Article
Publication date: 6 November 2017

Muhammad Ansar Majeed, Xian-zhi Zhang and Zhaonan Wang

This study aims to examine the impact of various dimensions of product market competition on accounting conservatism particularly in the wake of regulatory changes and…

Abstract

Purpose

This study aims to examine the impact of various dimensions of product market competition on accounting conservatism particularly in the wake of regulatory changes and varying ownership structures in China.

Design/methodology/approach

This study examines impact of product market competition on accounting conservatism by using conservatism measure of Khan and Watts (2009) and measures for important dimensions of competition such as competition intensity, non-price competition and competition from existing rivals and potential entrants.

Findings

The findings suggest that competition intensity and non-price competition result in higher conservatism. This study also advocates that industry leaders exhibit lower conservatism as compared to industry followers. Moreover, the authors document positive association between competition from existing/potential rivals and accounting conservative. These findings reveal that regulatory changes (International Financial Reporting Standards adoption) influence the effect of various dimensions of competition on conservatism. The authors also propose that financial reporting practices of state-owned enterprises are not influenced by competition. However, competition affects financial reporting (conservatism) when institutional or managerial ownership is higher.

Originality/value

The authors document that strategic considerations shape conservative financial reporting decisions of the managers. This study also advocates that when regulatory changes affect the influence of competitive pressure on the conservative reporting decisions of the mangers. Findings also suggest that unlike state ownership, institutional as well as managerial ownership affects the influence of competition on managerial decisions like conservative financial reporting. These results are robust to various alternative measures of conservatism.

Details

Chinese Management Studies, vol. 11 no. 4
Type: Research Article
ISSN: 1750-614X

Keywords

Click here to view access options
Article
Publication date: 7 March 2016

Yonghong Xia, Junbo Liu, Bo Xu and Hongjian Wu

The purpose of this paper is to propose a novel hybrid excitation permanent magnet synchronous generator (HEPMSG) utilizing tooth harmonic for excitation, the structural…

Abstract

Purpose

The purpose of this paper is to propose a novel hybrid excitation permanent magnet synchronous generator (HEPMSG) utilizing tooth harmonic for excitation, the structural features and operation principle of which are also described.

Design/methodology/approach

To obtain the operation performance quickly, this paper derives the mathematical model of the machine system represented by circuit, and analyzes the operation mode of rectifier circuit in the tooth harmonic excitation system, then the standard state equations for each operation mode are obtained. Combining the inductance parameter of this machine with the load resistance and inductance, the armature current waveform, the field current waveform and tooth harmonic winding current waveform are obtained by using the numerical method to solve the standard state equation.

Findings

Comparing with the experimental results, the availability of the principle and the validity of the model of the machine system are verified.

Practical implications

This HEPMSG is a new brushless self-excited and self-regulated generator, which is suitable for an independent power source.

Originality/value

Unlike the existing hybrid excitation permanent magnet machine, this HEPMSG utilized the inherent tooth harmonic EMF of the rotor to adjust the air-gap magnetic field of the permanent magnet machine.

Details

COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, vol. 35 no. 2
Type: Research Article
ISSN: 0332-1649

Keywords

Click here to view access options
Article
Publication date: 25 June 2014

Fang-wei Zhu, Xiu-xia Sun, Janis Miller and Zhi-jun Deng

This article presents an advanced method for managing knowledge using a modular design approach and applied the approach through an example with computer manufacturing…

Abstract

This article presents an advanced method for managing knowledge using a modular design approach and applied the approach through an example with computer manufacturing. The benefits of modularity are discussed both within and between companies. We find that through modular design, knowledge management systems are simplified and communication between modules is greatly improved. In addition, modularity makes parallel innovation possible, as well as, sharing innovative resources through collaboration. Modularity leads to effective knowledge sharing and thus stimulates knowledge-based innovation. A case study of the computer industry further demonstrates the effects of modularity in an industry. Finally, we suggest that enterprises should take advantage of modularity when they carry out knowledge-based innovation and the measures are developed to implement successful modularity.

Details

International Journal of Innovation Science, vol. 6 no. 2
Type: Research Article
ISSN: 1757-2223

Keywords

Click here to view access options
Article
Publication date: 10 August 2015

Xia Zhu and Judy Zolkiewski

– This study aims to explore how business-to-business service failures manifest in a manufacturing context.

Downloads
5758

Abstract

Purpose

This study aims to explore how business-to-business service failures manifest in a manufacturing context.

Design/methodology/approach

The empirical research involved two case studies: case study one included 20 interviews in the metal finishing industry; case study two included 20 interviews in the paint and coatings industry. In both case studies, suppliers and customers’ perceptions were obtained to facilitate a dyadic understanding of the phenomena.

Findings

Business-to-business service failure is a complex, dynamic and interactive process. It varies according to type of service, services supporting the products and services supporting the customers, service quality dimensions and the source of the failure. It can have a more profound impact than service failure in a consumer context because it may cause disruption to customers’ production and have a negative influence of failure on their clients in the network.

Research limitations/implications

Business customers may play a role in value co-destruction rather than value co-creation by causing service failures due to errors on their part. The consequences of the domino effects revealed in this study need to be given careful consideration by managers. The research is exploratory, and the findings may be influenced by the manufacturing sector in which the case study firms are based.

Originality/value

Business-to-business service failure has its own distinct characteristics, as it may impact widely in the business-to-business network. Domino effects implicitly dominate business-to-business service failure episodes where negative outcomes cascade downstream and affect service recipients’ customers.

Details

Journal of Services Marketing, vol. 29 no. 5
Type: Research Article
ISSN: 0887-6045

Keywords

Click here to view access options
Article
Publication date: 2 January 2018

Behrooz Rezaeealam and Farhad Rezaee-Alam

The purpose of this paper is to present a new optimal design for integral slot permanent magnet synchronous motors (PMSMs) to shape the air-gap magnetic field in…

Abstract

Purpose

The purpose of this paper is to present a new optimal design for integral slot permanent magnet synchronous motors (PMSMs) to shape the air-gap magnetic field in sinusoidal and to reduce the cogging torque, simultaneously.

Design/methodology/approach

For obtaining this new optimal design, the influence of different magnetizations of permanent magnets (PMs), including radial, parallel and halbach magnetization is investigated on the performance of one typical PMSM by using the conformal mapping (CM) method. To reduce the cogging torque even more, the technique of slot opening shift is also implemented on the stator slots of analyzed PMSM without reduction in the main performance, including the air-gap magnetic field, the average torque and back-electromotive force (back-EMF).

Findings

Finally, an optimal configuration including the Hat-type magnet poles with halbach magnetization on the rotor and shifted slot openings on the stator is obtained through the CM method, which shows the main reduction in cogging torque and the harmonic content of air-gap magnetic field.

Practical implications

The obtained optimal design is completely practical and is validated by comparing with the corresponding results obtained through finite element method.

Originality/value

This paper presents a new optimal design for integral slot PMSMs, which can include different design considerations, such as the reduction of cogging torque and the total harmonic distortion of air-gap magnetic field by using the CM method.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 37 no. 1
Type: Research Article
ISSN: 0332-1649

Keywords

1 – 10 of over 1000