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Article
Publication date: 11 January 2008

Cao Shun'an, Zhu Qing and Zhang Zhixin

This paper sets out to study the corrosion of No. 20 carbon steel without film and with films of different qualities in high‐temperature boiler water with different Cl

547

Abstract

Purpose

This paper sets out to study the corrosion of No. 20 carbon steel without film and with films of different qualities in high‐temperature boiler water with different Cl concentrations.

Design/methodology/approach

The static simulated experiment in high‐pressure autoclave and the surface analysis methods of EPMA and XRD were carried out to study the corrosion effect.

Findings

Under the following conditions: T=360±3°C, pH = 9.40±0.10, cO2<0.020 mg/l, the density of pitting corrosion on specimens without a protective film increased with the increase of CCl content, while CCl was > 0.2 mg/l. The film on specimens with integral films would not dissolve observably even until the CCl concentration was as high as 0.8 mg/l. Films with corrosion pits would begin dissolving when the Cl concentration reached 0.4 mg/l. The main constituents of the oxidative films in the gas and liquid phases both were Fe3O4.

Practical implications

In order to prevent carbon steel from corroding in boiler water containing Cl under conditions of low‐phosphate and low‐sodium hydroxide treatment, the concentration of Cl should be strictly controlled.

Originality/value

It was found that the presence of excessive Cl in boiler water accelerated the corrosion of No. 20 carbon steel and the maximum permissible concentration of Cl under the conditions (temperature and pressure) of sub‐critical drum boilers was 0.2 mg/l. The research results can provide theoretical guidelines for preventing the facilities of power plants from corroding.

Details

Anti-Corrosion Methods and Materials, vol. 55 no. 1
Type: Research Article
ISSN: 0003-5599

Keywords

Available. Content available
Article
Publication date: 1 August 2006

251

Abstract

Details

Disaster Prevention and Management: An International Journal, vol. 15 no. 4
Type: Research Article
ISSN: 0965-3562

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Article
Publication date: 2 January 2018

Hanhua Zhang, Jun Li, Jun Zou, Zhixin Wang and Jin Yang

The track impedance is one of the most important parameters in designing the track circuit which is widely used in the railway signal control system to detect the presence of a…

85

Abstract

Purpose

The track impedance is one of the most important parameters in designing the track circuit which is widely used in the railway signal control system to detect the presence of a train. This paper aims to calculate the ballastless track impedance by taking account of the influence of reinforcement bars.

Design/methodology/approach

This paper proposes a two-step decomposition approach to calculate the ballastless track impedance. The basic idea is evaluating the track impedance without the reinforcement bars by using two-dimensional (2D) finite element method (FEM), and the incremental impedance, because of the reinforcement bar, is calculated by the partial element equivalent circuit (PEEC) method.

Findings

The numerical examples show that the proposed approach can guarantee the accuracy and largely reduce the computing time, at least 20 times, compared with the direct three-dimensional (3D) FEM method.

Research limitations/implications

The study provides a fast approach to calculate the ballastless track impedance. However, compared with the 3D FEM method, the results are less accurate because of the approximation and assumption adopted in the method. A future study should pay more attention to improve accuracy of the model.

Originality/value

A fast approach is proposed to calculate the ballastless track impedance taking account of the influence of the reinforcement bars. The computing time can be largely reduced by using the method. With the proposed approach, the influence of insulation of the reinforcement bars on track impedance can be analyzed.

Details

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

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Article
Publication date: 25 September 2019

Zhihong Li, Yongzhong Sha, Xuping Song, Kehu Yang, Kun ZHao, Zhixin Jiang and Qingxia Zhang

Risk perception is an essential factor affecting how individuals evaluate risk, make decisions and behave. The impact of risk perception on customer purchase behavior has been…

5379

Abstract

Purpose

Risk perception is an essential factor affecting how individuals evaluate risk, make decisions and behave. The impact of risk perception on customer purchase behavior has been widely studied; however, the association has been debated. Therefore, the purpose of this paper is to examine the relationship between risk perception and customer purchase behavior and to examine factors that could moderate it.

Design/methodology/approach

This study conducted a meta-analysis of this relationship and examined factors that could moderate it. Six databases were comprehensively searched. Two reviewers independently selected the studies for inclusion, extracted data and assessed quality. Pearson's r was used as the effect estimate. A total of 33 studies were included in the meta-analysis.

Findings

The results revealed a negative relationship between risk perception and customer purchase behavior. The geographical region, purchase channel and country development level affected the relationship. The correlation between perceived risk and purchase behavior in European consumers was the highest, followed by the correlation in American consumers; the weakest correlation was found in Asian consumers. For consumers in developed countries, perceived risk had a stronger negative influence on customer purchase behavior than that for consumers in developing countries. The perceived risk of online purchase channels had a stronger negative impact on customer purchase behavior than that of offline purchase channels.

Research limitations/implications

Risk perception is a useful context in which to explain barriers to customer purchase behavior. In addition, reducing consumers’ risk perception and perfecting the market transaction process with respect to buying behavior should be further studied.

Originality/value

The findings of this review indicate a direct negative relationship between risk perception and customer purchase behavior. To the best of the authors’ knowledge, this review is the first to meta-analytically summarize the impact of risk perception on customer purchase behavior in social sciences research, and it also illuminates new perspectives for future studies.

Details

Journal of Business & Industrial Marketing, vol. 35 no. 1
Type: Research Article
ISSN: 0885-8624

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Article
Publication date: 8 August 2018

Shuaishuai Zhu, Baosen Zhang, Zhixin Ba, Xiangyang Mao, Weijie Fei and Zhangzhong Wang

This paper aims to investigate the friction and wear properties of Cr-Ni-Mo-V steel against 440C stainless steel under both water and water–silica mixture lubricant.

117

Abstract

Purpose

This paper aims to investigate the friction and wear properties of Cr-Ni-Mo-V steel against 440C stainless steel under both water and water–silica mixture lubricant.

Design/methodology/approach

The Cr-Ni-Mo-V steel specimens were taken from a forged steel brake disc with the process of quenching at 900°C and tempering at 600°C. The tribological testing was performed using a contact configuration of ball-on-flat with a liquid cell according to the ASTM standard. Detailed examinations on the worn surface were analyzed using a scanning electron microscope.

Findings

The results indicate that the friction coefficient and friction damage of the steel sliding under water–silica mixture are higher than those under water. The friction coefficient decreases with increasing load and increases with the sliding speed for the two lubricants. The mass wear rate presents a rising trend with both sliding load and speed. The wear mechanisms of the Cr-Ni-Mo-V steel sliding under the two lubricants are oxidation wear, abrasive wear and fatigue wear.

Research limitations/implications

Because of the chosen tribological testing approach, the research results could not describe the tribological performance of the brake disc accurately during actual braking process of the high-speed train. Therefore, researchers are encouraged to test the proposed propositions further.

Originality/value

This study shows that the tribology behavior of the Cr-Ni-Mo-V steel with water or water–silica mixture lubrications helps the industrial firms and academicians to work on the wear of the brake disc in rainwater or wet environment.

Details

Industrial Lubrication and Tribology, vol. 70 no. 8
Type: Research Article
ISSN: 0036-8792

Keywords

Available. Open Access. Open Access
Article
Publication date: 17 May 2024

Tianyi Zhang, Haowu Luo, Ning Liu, Feiyan Min, Zhixin Liang and Gao Wang

As the demand for human–robot collaboration in manufacturing applications grows, the necessity for collision detection functions in robots becomes increasingly paramount for…

450

Abstract

Purpose

As the demand for human–robot collaboration in manufacturing applications grows, the necessity for collision detection functions in robots becomes increasingly paramount for safety. Hence, this paper aims to improve the existing method to achieve efficient, accurate and sensitive robot collision detection.

Design/methodology/approach

The external torque is estimated by momentum observers based on the robot dynamics model. Because the state of the joints is more accessible to distinguish under the action of the suppression operator proposed in this paper, the mutated external torque caused by joint reversal can be accurately attenuated. Finally, time series analysis (TSA) methods can continuously generate dynamic thresholds based on external torques.

Findings

Compared with the collision detection method based only on TSA, the invalid time of the proposed method is less during joint reversal. Although the soft-collision detection accuracy of this method is lower than that of the symmetric threshold method, it is superior in terms of detection delay and has a higher hard-collision detection accuracy.

Originality/value

Owing to the mutated external torque caused by joint reversal, which seriously affects the stability of time series models, the collision detection method based only on TSA cannot detect continuously. The consequences are disastrous if the robot collides with people or the environment during joint reversal. After multiple experimental verifications, the proposed method still exhibits detection capabilities during joint reversal and can implement real-time collision detection. Therefore, it is suitable for various engineering applications.

Details

Industrial Robot: the international journal of robotics research and application, vol. 51 no. 4
Type: Research Article
ISSN: 0143-991X

Keywords

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Article
Publication date: 26 June 2019

Zhixin Chen, Jian Chen, Zhonggen Zhang and Xiaojuan Zhi

The purpose of this paper is to provide a framework to illustrate how network governance based on banks’ e-commerce platform reduces loan risks and mitigates credit rationing in…

772

Abstract

Purpose

The purpose of this paper is to provide a framework to illustrate how network governance based on banks’ e-commerce platform reduces loan risks and mitigates credit rationing in supply chain financing (SCF).

Design/methodology/approach

The authors conceptualize network governance in terms of authority structure and interorganizational mechanism dimensions, and derive the model of its determinants through arguments drawn from the existing literature. Structural equation modeling is employed to test the theoretical model on data collected from a sample of 271 independent supply chain trading partners in rural China.

Findings

The findings indicate that network governance based on banks’ e-commerce platform could integrate the operations and finances in supply chain management to solve the problems of information asymmetry, costly monitoring, insufficient qualified collaterals and mitigate farmers’ credit rationing. The collaborative credit-granting mechanism and collaborative debt enforcement mechanism formed by the authority structure and interorganizational mechanisms are the key factors to realize the complete compatibility of incentives. The bank e-commerce platform can provide a foundation for the authority structure and interorganizational mechanisms to enhance the predictability of applicants’ transaction and then safeguard the financial exchanges in supply chain.

Practical implications

The research results indicate that it is important to support farmers to establish long-term transaction relationships with leading enterprises through organizational innovation in the development of agricultural industrialization and build a visualization platform for SCF through technological innovation.

Originality/value

This paper contributes to the limited knowledge about network governance mechanisms in SCF by illustrating the model of network governance based on banks’ e-commerce platform and its determinants.

Details

China Agricultural Economic Review, vol. 11 no. 4
Type: Research Article
ISSN: 1756-137X

Keywords

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Article
Publication date: 24 January 2024

Dexin Chen, Hongyuan He, Zhixin Kang and Wei Li

This study aims to review the current one-step electrodeposition of superhydrophobic coatings on metal surfaces.

225

Abstract

Purpose

This study aims to review the current one-step electrodeposition of superhydrophobic coatings on metal surfaces.

Design/methodology/approach

One-step electrodeposition is a versatile and simple technology to prepare superhydrophobic coatings on metal surfaces.

Findings

Preparing superhydrophobic coatings by one-step electrodeposition is an efficient method to protect metal surfaces.

Originality/value

Even though there are several technologies, one-step electrodeposition still plays a significant role in producing superhydrophobic coatings.

Details

Anti-Corrosion Methods and Materials, vol. 71 no. 2
Type: Research Article
ISSN: 0003-5599

Keywords

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Article
Publication date: 8 July 2022

Xiaolong Yang, Long Zheng, Da Lü, Jinhao Wang, Shukun Wang, Hang Su, Zhixin Wang and Luquan Ren

Snake-inspired robots are of great significance in many fields because of their great adaptability to the environment. This paper aims to systematically illustrate the research…

1389

Abstract

Purpose

Snake-inspired robots are of great significance in many fields because of their great adaptability to the environment. This paper aims to systematically illustrate the research progress of snake-inspired robots according to their application environments. It classifies snake-inspired robots according to the numbers of degrees of freedom in each joint and briefly describes the modeling and control of snake-inspired robots. Finally, the application fields and future development trends of snake-inspired robots are analyzed and discussed.

Design/methodology/approach

This paper summarizes the research progress of snake-inspired robots and clarifies the requirements of snake-inspired robots for self-adaptive environments and multi-functional tasks. By equipping various sensors and tool modules, snake-inspired robots are developed from fixed-point operation in a single environment to autonomous operation in an amphibious environment. Finally, it is pointed out that snake-inspired robots will be developed in terms of rigid and flexible deformable structure, long endurance and multi-function and intelligent autonomous control.

Findings

Inspired by the modular and reconfigurable concepts of biological snakes, snake-inspired robots are well adapted to unknown and changing environments. Therefore, snake-inspired robots will be widely used in industrial, military, medical, post-disaster search and rescue applications. Snake-inspired robots have become a hot research topic in the field of bionic robots.

Originality/value

This paper summarizes the research status of snake-inspired robots, which facilitates the reader to be a comprehensive and systematic understanding of the research progress of snake-inspired robots. This helps the reader to gain inspiration from biological perspectives.

Details

Assembly Automation, vol. 42 no. 4
Type: Research Article
ISSN: 0144-5154

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Article
Publication date: 5 April 2021

Zhixin Wang, Peng Xu, Bohan Liu, Yankun Cao, Zhi Liu and Zhaojun Liu

This paper aims to demonstrate the principle and practical applications of hyperspectral object detection, carry out the problem we now face and the possible solution. Also some…

488

Abstract

Purpose

This paper aims to demonstrate the principle and practical applications of hyperspectral object detection, carry out the problem we now face and the possible solution. Also some challenges in this field are discussed.

Design/methodology/approach

First, the paper summarized the current research status of the hyperspectral techniques. Then, the paper demonstrated the development of underwater hyperspectral techniques from three major aspects, which are UHI preprocess, unmixing and applications. Finally, the paper presents a conclusion of applications of hyperspectral imaging and future research directions.

Findings

Various methods and scenarios for underwater object detection with hyperspectral imaging are compared, which include preprocessing, unmixing and classification. A summary is made to demonstrate the application scope and results of different methods, which may play an important role in the application of underwater hyperspectral object detection in the future.

Originality/value

This paper introduced several methods of hyperspectral image process, give out the conclusion of the advantages and disadvantages of each method, then demonstrated the challenges we face and the possible way to deal with them.

Details

Sensor Review, vol. 41 no. 2
Type: Research Article
ISSN: 0260-2288

Keywords

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