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1 – 6 of 6Jinshuai Xie, Lei Tang, Pengfei Gao, Zhengquan Zhang and Liangfeng Li
This paper aims to study the effect of different Ni content on the microstructure and properties of Sn-0.7Cu alloy. Then, the spreading area, wetting angle, interface layer…
Abstract
Purpose
This paper aims to study the effect of different Ni content on the microstructure and properties of Sn-0.7Cu alloy. Then, the spreading area, wetting angle, interface layer thickness and microstructure of the soldering interface was observed and analyzed at different soldering temperatures and times.
Design/methodology/approach
Sn-0.7Cu-xNi solder alloy was prepared by a high-frequency induction melting furnace. Then Sn-0.7Cu-xNi alloy was soldered on a Cu substrate at different soldering temperatures and times.
Findings
It was found that Ni made the intermetallic compounds in the Sn-0.7Cu solder alloy gradually aggregate and coarsen, and the microstructure was refined. The phase compositions of the solder alloy are mainly composed of the ß-Sn phase and a few intermetallic compounds, Cu6Sn5 + (Cu, Ni)6Sn5. The maximum value of 12.1 HV is reached when the Ni content is 0.1 Wt.%. When the Ni content is 0.5 Wt.%, the wettability of the solder alloy increases by about 15%, the interface thickness increases by about 8.9% and the scallop-like structure is the most refined. When the soldering time is 10 min and the soldering temperature is 280 °C, the wettability of Sn-0.7Cu-0.2Ni is the best.
Originality/value
It is groundbreaking to combine the change in soldering interface with the soldering industry. The effects of different soldering temperatures and times on the Sn-0.7Cu-xNi alloy were studied. Under the same conditions, Sn-0.7Cu-0.2Ni exhibits better wettability and more stable solder joint stability.
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Yandong Hou, Zhengbo Wu, Xinghua Ren, Kaiwen Liu and Zhengquan Chen
High-resolution remote sensing images possess a wealth of semantic information. However, these images often contain objects of different sizes and distributions, which make the…
Abstract
Purpose
High-resolution remote sensing images possess a wealth of semantic information. However, these images often contain objects of different sizes and distributions, which make the semantic segmentation task challenging. In this paper, a bidirectional feature fusion network (BFFNet) is designed to address this challenge, which aims at increasing the accurate recognition of surface objects in order to effectively classify special features.
Design/methodology/approach
There are two main crucial elements in BFFNet. Firstly, the mean-weighted module (MWM) is used to obtain the key features in the main network. Secondly, the proposed polarization enhanced branch network performs feature extraction simultaneously with the main network to obtain different feature information. The authors then fuse these two features in both directions while applying a cross-entropy loss function to monitor the network training process. Finally, BFFNet is validated on two publicly available datasets, Potsdam and Vaihingen.
Findings
In this paper, a quantitative analysis method is used to illustrate that the proposed network achieves superior performance of 2–6%, respectively, compared to other mainstream segmentation networks from experimental results on two datasets. Complete ablation experiments are also conducted to demonstrate the effectiveness of the elements in the network. In summary, BFFNet has proven to be effective in achieving accurate identification of small objects and in reducing the effect of shadows on the segmentation process.
Originality/value
The originality of the paper is the proposal of a BFFNet based on multi-scale and multi-attention strategies to improve the ability to accurately segment high-resolution and complex remote sensing images, especially for small objects and shadow-obscured objects.
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Jie Ren, Weichen Xu, Lihui Yang, Zhengquan Wang and YanTao Li
This study aims to investigate the effect of vapor phase corrosion inhibitor (VCI) imidazoline, quinoline and urea on E36 ship steel in simulated marine atmospheric environment.
Abstract
Purpose
This study aims to investigate the effect of vapor phase corrosion inhibitor (VCI) imidazoline, quinoline and urea on E36 ship steel in simulated marine atmospheric environment.
Design/methodology/approach
The inhibitive effect was investigated by weight loss, potentiodynamic polarization, electrochemical impedance and Raman spectroscopy.
Findings
The corrosion process was inhibited by adsorption of the three VCIs on the surface of ship steel. The corrosion inhibition mechanism is the adsorption film type. The corrosion inhibitor adsorbs on the metal surface to prevent Cl- from reaching the surface of the substrate, so as to achieve the corrosion inhibition effect.
Originality/value
To the best of the authors’ knowledge, the work described was original research that has not been published previously and not under consideration for publication elsewhere, in whole or in part.
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Zhengquan Chen, Lu Han and Yandong Hou
This paper proposes a novel method of fault detection, which is based on H_/H∞ Runge–Kutta observer and an adaptive threshold for a class of closed-loop non-linear systems. The…
Abstract
Purpose
This paper proposes a novel method of fault detection, which is based on H_/H∞ Runge–Kutta observer and an adaptive threshold for a class of closed-loop non-linear systems. The purpose of this paper is to improve the rapidity and accuracy of fault detection.
Design/methodology/approach
First, the authors design the H_/H∞ Runge–Kutta fault detection observer, which is used as a residual generator to decouple the residual from the input. The H_ performance index metric in the specified frequency domain is used to describe how sensitive the residual to the fault. The H∞ norm is used to describe the residual robustness to the external disturbance of the systems. The residual generator is designed to achieve the best tradeoff between robustness against unknown disturbances but sensitivity to faults, thus realizing the accurate detection of the fault by suppressing the influence of noise and disturbance on the residual. Next, the design of the H_/H∞ fault detection observer is transformed into a convex optimization problem and solved by linear matrix inequality. Then, a new adaptive threshold is designed to improve the accuracy of fault detection.
Findings
The effectiveness and correctness of the method are tested in simulation experiments.
Originality/value
This paper presents a novel approach to improve the accuracy and rapidity of fault detection for closed-loop non-linear system with disturbances and noise.
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Xiaohua Yang and Clyde D. Stoltenberg
This paper aims to re-examine the role of institutions in the rise of made-in-China multinationals. Specifically, the paper seeks to understand how changes in the global…
Abstract
Purpose
This paper aims to re-examine the role of institutions in the rise of made-in-China multinationals. Specifically, the paper seeks to understand how changes in the global environment, especially global financial crisis, have solidified the Chinese government's role in pushing and encouraging Chinese firms to engage in outbound foreign direct investment (OFDI) activities.
Design/methodology/approach
This is a conceptual paper. The analysis is based on a large number of publicly available sources, including research papers, government documents, and reports. The paper strives to triangulate the validity of the data with multiple sources.
Findings
The study finds that while the role of the state in China has been evolving since the start of the economic reforms in 1978, by no means has it been lessened. Instead, the state has asserted its role specifically to grow Chinese multinationals in size and in number, by leveraging the financial resources accumulated over the last 30 years, by taking advantage of the cheap assets made available globally by the recent financial crisis and by institutionalizing its “Go Global” strategy.
Research limitations/implications
The study implies that the role of the state will be further solidified through China's national goal of enhancing competitiveness via knowledge acquisition through OFDI and simultaneously, multinationals’ OFDI initiatives and strategies will be reinforced by the state's economic policies and goals while their commercial interests will take on an increasing importance in the global marketplace and their behavior will co-evolve with and be reshaped by local, national, and international environments. The paper suggests that future studies employ co-evolutionary theory to investigate the role of state-owned enterprises (especially the functions of their CEOs) as well as non-state actors in shaping the institutional framework in China. Future studies should verify some of the ideas with empirical data and strive to triangulate different data sources to increase data quality.
Practical implications
The study also provides implications to Chinese policy makers on how to balance the government's role as conductor, enabler, protector, and constrainer while allowing Chinese multinationals to integrate into the global market for the benefit of both China and the world economy.
Originality/value
This study represents an original contribution to this topic. The research contributes to the study of globalization of Chinese enterprises by exploring the renewed dynamic relationship between the state and the firm after the 2008 global financial crisis.
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Nada K. Kakabadse, Hong Yang and Richard Sanders
The primary aim of this paper is to examine whether boards of directors with independent members function as effective corporate governance mechanisms in Chinese State‐Owned…
Abstract
Purpose
The primary aim of this paper is to examine whether boards of directors with independent members function as effective corporate governance mechanisms in Chinese State‐Owned Enterprises (SOEs), by analysing four characteristics of non‐executive directors (NEDs) that impact on their effectiveness, namely their degree of independence, information, incentive, and competence.
Design/methodology/approach
Being exploratory in nature, the research uses qualitative methods for data collection. It is based on an interpretivist perspective of social sciences, analysing and explaining the factors that influence the effectiveness of NEDs.
Findings
The findings indicate that the NED system is weak in China as a result of the concentrated ownership structure, unique business culture, intervention of controlling shareholders and the lack of understanding of the benefits brought by NEDs.
Research limitations/implications
The paper examines the salient features of and challenges to the system of NEDs of SOEs in present‐day China. It provides an understanding of how the various perceptions of the board, gathered from in‐depth interviews of corporate directors, leads to new interpretations of board effectiveness. The research, however, is limited owing to a relatively small sample size and the sensitive nature of the information collected.
Originality/value
The study aims to fill gaps in the literature and contribute to it by assessing the “real” views and perceptions of NEDs in China in an institutional environment significantly different from that of the USA, the UK and other western economies.
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