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Article
Publication date: 1 November 2021

Yang Liu, Yuxiong Xue, Min Zhou, Rongxing Cao, Xianghua Zeng, Hongxia Li, Shu Zheng and Shuang Zhang

The purpose of this paper is to investigate the effects of Sn-Ag-x leveling layers on the mechanical properties of SnBi solder joints. Four Sn-Ag-x (Sn-3.0Ag-0.5Cu…

Abstract

Purpose

The purpose of this paper is to investigate the effects of Sn-Ag-x leveling layers on the mechanical properties of SnBi solder joints. Four Sn-Ag-x (Sn-3.0Ag-0.5Cu, Sn-0.3Ag-0.7Cu, Sn-0.3Ag-0.7Cu-0.5 Bi-0.05Ni and Sn-3.0Ag-3.0 Bi-3.0In) leveling layers were coated on Cu pads to prepare SnBi/Sn-Ag-x/Cu solder joints. The microstructure, hardness, shear strength and fracture morphology of solder joints before and after aging were studied.

Design/methodology/approach

The interfacial brittleness of the SnBi low-temperature solder joint is a key problem affecting its reliability. The purpose of this study is to improve the mechanical properties of the SnBi solder joint.

Findings

Owing to the addition of the leveling layers, the grain size of the ß-Sn phase in the SnBi/Sn-Ag-x/Cu solder joint is significantly larger than that in the SnBi/Cu eutectic solder joint. Meanwhile, the hardness of the solder bulk in the SnBi/Cu solder joint shows a decrease trend because of the addition of the leveling layers. The SnBi/Cu solder joint shows obvious strength drop and interfacial brittle fracture after aging. Through the addition of the Sn-Ag-x layers, the brittle failure caused by aging is effectively suppressed. In addition, the Sn-Ag-x leveling layers improve the shear strength of the SnBi/Cu solder joint after aging. Among them, the SnBi/SACBN/Cu solder joint shows the highest shear strength.

Originality/value

This work suppresses the interfacial brittleness of the SnBi/Cu solder joint after isothermal aging by adding Sn-Ag-x leveling layers on the Cu pads. It provides a way to improve the mechanical performances of the SnBi solder joint.

Details

Soldering & Surface Mount Technology, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0954-0911

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Article
Publication date: 18 July 2018

Hongxia Li and Xiugang Yang

The argument that work engagement enhances job performance has gained wide acceptance among practitioners and human resources management literature. There is consensus in…

Abstract

Purpose

The argument that work engagement enhances job performance has gained wide acceptance among practitioners and human resources management literature. There is consensus in management literature that job crafting can affect work engagement. The concept of callings from theology has been resurrected in job behavior and continues to garner growing attention from practitioners in recent years. However, few studies examine how and why living a calling influence job crafting and work engagement. The purpose of this paper is to examine the relationships between living a calling, job crafting and work engagement for knowledgeable employees through questionnaires.

Design/methodology/approach

The part-time MBA students were asked to reflect on present jobs. In total, 390 effective questionnaires were collected from part-time MBA students of four universities in Chongqing, China for finance, administration, manufacturing, service, technology, medication, education and others. Results were analyzed using SPSS and Amos. The measurement scale is given in Appendix.

Findings

First, the author explicitly proposes and validates the direct relationship between living a calling and job crafting. Second, this study confirms that crafting challenging job demands are significant to vigor subdimension and dedication subdimension of work engagement, whereas crafting challenging job demands not significant to absorption subdimension of work engagement. Third, this study indicates that crafting hindering job demands are nonsignificant to vigor, dedication and absorption about three subdimensions of work engagement. Fourth, this study showed living a calling can enhance work engagement for employees. Fifth, this study finds three groups (eight items) of mediation effect between living a calling, job crafting and work engagement.

Practical implications

These insights may help managers to focus on living a calling and encourage beneficial job crafting behaviors in China. The sample is original and has the potential to contribute to debate on work life balance and particularly the meaning of work/careers in China.

Social implications

This study is an interesting revisit to the old workplace sociology and organizational psychology which has become somewhat neglected these days.

Originality/value

This study has provided insight in the relationships between living a calling, job crafting and work engagement.

Details

Journal of Chinese Human Resource Management, vol. 9 no. 2
Type: Research Article
ISSN: 2040-8005

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Article
Publication date: 24 April 2007

Zongjun Wang and Hongxia Li

To empirically estimate a rough set (RS) model in financial distress prediction for Chinese listed companies and assess its classification accuracy.

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Abstract

Purpose

To empirically estimate a rough set (RS) model in financial distress prediction for Chinese listed companies and assess its classification accuracy.

Design/methodology/approach

RS model is used to test the effect of financial ratios and some non‐financial ratios on the probability of financial distress with a sample of 212 financial distressed firms and 212 healthy firms through years 1998‐2005.

Findings

Growth ratio of per share of equity, net return on assets, earnings per share, interest coverage, ownership concentration coefficient, net profit margin, pledge, retained‐earnings ratio and total assets turnover have strong classification power in financial distress prediction of Chinese listed companies, especially the ownership concentration coefficient. Prediction model combining financial and non‐financial ratios outperforms the one just containing financial ratios.

Research limitations/implications

One limitation of this research is that it relies on publicly available data and the RS method. Further research can be devoted to making comparisons between the RS method and other prediction methods, and constructing hybrid prediction models with the use of RS and other artificial intellectual methods as well.

Practical implications

It is necessary to consider every aspect of the company when making financial distress prediction, not just financial ratios, to improve the explanatory power of the prediction model.

Originality/value

This study explores how financial ratios and non‐financial ratios, with the help of RS theory, under the restricted tradability of stocks in the emerging stock market, impact on corporate financial distress. The prediction model employed here considers not only accounting ratios, but also cash flow and corporate governance variables, thus improving the prediction accuracy.

Details

Chinese Management Studies, vol. 1 no. 2
Type: Research Article
ISSN: 1750-614X

Keywords

Content available
Article
Publication date: 24 April 2007

Check-Teck Foo

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600

Abstract

Details

Chinese Management Studies, vol. 1 no. 2
Type: Research Article
ISSN: 1750-614X

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Article
Publication date: 1 October 2018

Liang Ge, Hongxia Deng, Qing Wang, Ze Hu and Junlan Li

The purpose of this study is to deal largely with the influence of temperature variation on the measurement accuracy of transit-time ultrasonic flowmeter.

Abstract

Purpose

The purpose of this study is to deal largely with the influence of temperature variation on the measurement accuracy of transit-time ultrasonic flowmeter.

Design/methodology/approach

The causes of measurement error due to temperature are qualitatively and quantitatively analyzed, and a mathematical model is established. The experimental data are processed and analyzed, and the temperature compensation coefficient of flow measurement is obtained.

Findings

The experimental results show that the flow measurement results by temperature compensation are helpful in improving the measurement accuracy of the ultrasonic flowmeter.

Practical implications

This study has certain application value, which can provide theoretical support for the design of high-precision ultrasonic flowmeters and design guidance.

Originality/value

It is worth emphasizing that there are few research studies on the influence factors of temperature. This paper focuses on the influence of the temperature change on the flowmeter that is modeled, and the high precision flow parameter test system is designed based on the established model.

Details

Sensor Review, vol. 39 no. 2
Type: Research Article
ISSN: 0260-2288

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Article
Publication date: 7 September 2021

Huizhe Li, Hongxia Ge and Rongjun Cheng

The goal of this study is to explore the effect of two-sided lateral gap with uncertain velocity on the stability of traffic flow on a curved road.

Abstract

Purpose

The goal of this study is to explore the effect of two-sided lateral gap with uncertain velocity on the stability of traffic flow on a curved road.

Design/methodology/approach

In this paper, an extended car-following model considering the effect of two-sided lateral gap with uncertain velocity on a curved road is proposed. The effects of different lateral positions and radius of different sizes can be considered as control signals. The stability condition of the new model is obtained by the control theory. The numerical simulations are carried out to analyze how the control signal and lateral positions and radius of curved road affect traffic flow stability. The results show that driving between two lanes and inaccurate speed estimates both have a negative effect on traffic flow stability, and the stability also decreases with the increase in the radius of curved road.

Findings

(1) Simulation of influencing factors of vehicle lateral position indicates that if the driver drives between two lanes, it would have a negative impact on traffic flow. (2) When the speed is fixed, the traffic flow becomes more and more unstable with the increase in the radius of the curve. (3) The stability of traffic flow will be affected when the driver estimates the speed of the vehicle ahead. Therefore, whether it is manual driving or future intelligent vehicle driving, it is necessary to accurately judge the speed of the front vehicle.

Originality/value

There is little research on two-sided lateral gap with uncertain velocity for the stability of traffic flow on a curved road. The enhanced model constructed in this study can better reflect the real traffic, which can also give some theoretical reference for the development of connected and autonomous vehicles (CAVs).

Details

Engineering Computations, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0264-4401

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Article
Publication date: 31 January 2020

Hailing Li, Hongxia Wan, Shengrong Wang, Cuiwei Du and Dawei Zhang

This paper aims to investigate the effect of alternating current (AC) on corrosion, it is not yet clear about the exact mechanism of the corrosion induced by AC. Previous…

Abstract

Purpose

This paper aims to investigate the effect of alternating current (AC) on corrosion, it is not yet clear about the exact mechanism of the corrosion induced by AC. Previous reports indicated that AC corrosion was similar to the effect of continuous cathodic and anodic polarization on the corrosion process of the metals. Wan et al. studied the effect of negative half-wave AC on stress corrosion cracking behavior and mechanism of X80 pipeline steel in near-neutral solution.

Design/methodology/approach

This study attempted to understand the AC-induced corrosion by imposing the half-cycle AC on the X80 pipeline steel in an acid bicarbonate solution. The AC corrosion mechanism was determined by weight loss and potentiodynamic polarization curve measurements, as well as surface characterization.

Findings

The results show that the positive half-cycle AC accelerated the uniform corrosion in the NaHCO3 solution, the negative half-cycle AC would decrease the uniform corrosion and local corrosion was increased and some Ca and Mg deposited on the surface of X80 steel, so the corrosion rate decreased by negative half-cycle AC. The corrosion product was composed of α-FeOOH under the application of positive half-cycle AC. The oxygen reduction led to a local increase of pH near the electrode surface and led to the formation of α-FeOOH, which enhanced the protectability of corrosion products.

Originality/value

Researchers studied the effect of negative half-wave AC on stress corrosion cracking behavior and mechanism of X80 pipeline steel in near-neutral solution. However, the AC behavior and corrosion mechanism in acid solution are unknown. So to make clear about the corrosion behavior of metals in different polarization states and the mechanism involved, diode technology was used to research the AC corrosion, half-wave AC was applied on the metals after the full-wave rectified.

Details

Anti-Corrosion Methods and Materials, vol. 67 no. 2
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 19 October 2021

Hongxia Zhang and Huixin Yang

To reconcile the existing contradictory conclusions on the relationship between cross-border mergers and acquisitions (M&As) and innovation, this paper aims to propose a…

Abstract

Purpose

To reconcile the existing contradictory conclusions on the relationship between cross-border mergers and acquisitions (M&As) and innovation, this paper aims to propose a theoretical model of the impact of cross-border M&As on technological innovation and explore the moderating role of institutional distance from the perspective of springboard theory and new institutional theory.

Design/methodology/approach

Through the use of the two-way fixed effect model and the U-test method, the authors test the hypotheses based on a sample of cross-border M&A events of Chinese manufacturing enterprises during the period from 2006 to 2019.

Findings

The research shows that there is an inverted U-shaped relationship between cross-border M&As and technological innovation. Furthermore, formal institutional distance moderates the inverted U-shaped relationship in such a way that it reaches its turning point at a smaller scale of cross-border M&As, and the inverted U-shaped relationship is steeper when formal institutional distance is relatively high. The informal institutional distance moderates the inverted U-shaped relationship in such a way that it reaches its turning point at a larger scale of cross-border M&As and the inverted U-shaped relationship is flatter when the informal institutional distance is relatively high.

Originality/value

The research conclusions integrate heterogeneous views of the existing research, further clarify the influence mechanism and boundary conditions between cross-border M&As and technological innovation, identify the different moderating roles of formal institutional distance and informal institutional distance and enrich the literature on knowledge transfer and recombinant innovation during post-merger integration.

Details

Journal of Knowledge Management, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1367-3270

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Article
Publication date: 8 September 2020

Shihao Li, Rongjun Cheng, Hongxia Ge and Pengjun Zheng

The purpose of this study is to explore the influence of the electronic throttle (ET) dynamics and the average speed of multiple preceding vehicles on the stability of…

Abstract

Purpose

The purpose of this study is to explore the influence of the electronic throttle (ET) dynamics and the average speed of multiple preceding vehicles on the stability of traffic flow.

Design/methodology/approach

An extended car-following model integrating the ET dynamics and the average speed of multiple preceding vehicles is presented in this paper. The novel model’s stability conditions are obtained by using the thought of control theory, and the modified Korteweg–de Vries equation is inferred in terms of the nonlinear analysis method. In addition, some simulation experiments are implemented to explore the properties of traffic flow, and the results of these experiments confirm the correctness of theoretical analysis.

Findings

In view of the results of theoretical analysis and numerical simulation, traffic flow will become more stable when the average speed and ET dynamics of multiple preceding vehicles are considered, and the stability of traffic flow will also be enhanced by increasing the number of preceding vehicles considered.

Research limitations/implications

This study leaves the factors such as the mixed traffic flow, the multilane and so on out of account in real road environment, which more or less influences the traffic flow’s stability, so the real traffic environment is not fully reflected.

Originality/value

There is little research integrating ET dynamics and the average velocity of multiple preceding vehicles to study the properties of traffic flow. The enhanced model constructed in this study can better reflect the real traffic, which can also give some theoretical reference for the development of connected and autonomous vehicles.

Details

Engineering Computations, vol. 38 no. 4
Type: Research Article
ISSN: 0264-4401

Keywords

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Article
Publication date: 10 January 2020

Lixiang Li, Hongxia Ge and Rongjun Cheng

This paper aims to put forward an extended lattice hydrodynamic model, explore its effects on alleviating traffic congestion and provide theoretical basis for traffic…

Abstract

Purpose

This paper aims to put forward an extended lattice hydrodynamic model, explore its effects on alleviating traffic congestion and provide theoretical basis for traffic management departments and traffic engineering implementation departments.

Design/methodology/approach

The control method is applied to study the stability of the new model. Through nonlinear analysis, the mKdV equation representing kink-antikink soliton is acquired.

Findings

The predictive effect and the control signal can enhance the traffic flow stability and reduce the energy consumption.

Originality/value

The predictive effect and feedback control are first considered in lattice hydrodynamic model simultaneously. Numerical simulations demonstrate that these two factors can enhance the traffic flow stability.

Details

Engineering Computations, vol. 37 no. 5
Type: Research Article
ISSN: 0264-4401

Keywords

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