Y. Kobayashi, S. Ishida, K. Ihara, Y. Yasuda and T. Morita
This work describes a metal-metal bonding process by the use of Cu nanoparticles as a filler material. The Cu particles used were prepared by reduction of Cu2+ with hydrazine in…
Abstract
This work describes a metal-metal bonding process by the use of Cu nanoparticles as a filler material. The Cu particles used were prepared by reduction of Cu2+ with hydrazine in the presence of cetyltrimethylammonium bromide as a dispersing agent (uncoated Cu particles). Polypyrrole (PPy)-coated Cu nanoparticles were also used as the filler. Strong bonding for Cu discs was not obtained by using the PPy-coated particles. For the uncoated Cu particles, a shear strength required for separating the discs bonded by annealing at 400°C in H2 gas was as large as 18.1 MPa.
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Wei Wang, Yongyong He, Yang Li, Bin Wei, Yutong Hu and Jianbin Luo
The purpose of this study is to investigate the inner flow field characteristics of groove textures in thrust bearings. Cavitation and vortex are studied simultaneously to enrich…
Abstract
Purpose
The purpose of this study is to investigate the inner flow field characteristics of groove textures in thrust bearings. Cavitation and vortex are studied simultaneously to enrich the theories of surface texture.
Design/methodology/approach
Navier–Stokes equations are solved using computational fluid dynamics. The MIXTURE model is adopted to study the gas–liquid mixture flow under the cavitation condition.
Findings
Re number, the depth ratio as well as the area ratio of the groove texture and the bottom shape are all influencing factors of the inner flow field characteristics. When cavitation region and vortex region occupy the bottom of the groove texture, these do not overlap because of the pressure gradient. The positive pressure gradient in the non-cavitation region introduces nonlinearity into the velocity profiles, which affects the load-carrying capacity and friction.
Originality/value
Cavitation and vortex are studied simultaneously only in this study. The characteristics of the textured thrust bearing can be analyzed and explained with the combined effect of cavitation and vortex.
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This paper aims to find proper technological parameters of low-temperature joining technique by silver sintering to eventually use this technique for reliable electronic packaging.
Abstract
Purpose
This paper aims to find proper technological parameters of low-temperature joining technique by silver sintering to eventually use this technique for reliable electronic packaging.
Design/methodology/approach
Based on the literature and author’s own experience, the factors influencing the nanosized Ag particle sintering results were identified, and their significance was assessed.
Findings
It has been shown that some important technological parameters clearly influence the quality of the joints, and their choice is unambiguous, but the meaning of some parameters is dependent on other factors (interactions), and they should be selected experimentally.
Originality/value
The value of this research is that the importance of all technological factors was analyzed, which makes it easy to choose the technological procedures in the electronic packaging.
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Zainab Ahmadi, Mahdi Salehi and Mahmoud Rahmani
This study aims to analyze the relationship between economic complexity (EC) and the green economy (GE) with the real and accrual earnings management (REM and AEM) of the listed…
Abstract
Purpose
This study aims to analyze the relationship between economic complexity (EC) and the green economy (GE) with the real and accrual earnings management (REM and AEM) of the listed companies on the Iranian stock exchange. The authors study whether EC and the GE can affect REM and AEM.
Design/methodology/approach
The authors used a multiple regression model based on the panel data and a fixed effect model to test hypotheses. The sample includes 1,351 companies listed on the Tehran Stock Exchange from 2014 to 2021.
Findings
The results show a positive and significant relationship between EC and the GE with REM and AEM.
Originality/value
Considering the importance of a GE and since this research is the first to address the mentioned topic in emerging markets, it provides helpful insights for financial statement users, analysts and legal entities. Our study fills the literature gap and promotes knowledge regarding its relevant literature. Examining this relationship portrays the latest research perspectives in this field. The information from this study can assist in environmental management decision-making and relevant policymaking, promoting the movement toward sustainable development.
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Murat Isik, Isa Emami Tabrizi, Raja Muhammad Awais Khan, Mehmet Yildiz, Eda Aydogan and Bahattin Koc
In recent years, additive manufacturing (AM) has started to be used for manufacturing real functional parts and assemblies for critical applications in aerospace, automotive, and…
Abstract
Purpose
In recent years, additive manufacturing (AM) has started to be used for manufacturing real functional parts and assemblies for critical applications in aerospace, automotive, and machinery industries. Most complex or assembled parts require internal features (IF) such as holes, channels, slots, or guides for locational and mating requirements. Therefore, it is critical to understand and compare the structural and mechanical properties of additively manufactured and conventionally machined IFs.
Design/methodology/approach
In this study, mechanical and microstructural properties of Inconel 718 (Inc718) alloy internal features, manufactured either as-built with AM or machining of additively manufactured (AMed) part thereafter were investigated.
Findings
The results showed that the average ultimate tensile strength (UTS) of additively manufactured center internal feature (AM-IF) is almost analogous to the machined internal feature (M-IF). However, the yield strength of M-IF is greater than that of AM-IF due the greater surface roughness of the internal feature in AM-IF, which is deemed to surpass the effect of microstructure on the mechanical performance. The results of digital image correlation (DIC) analysis suggest that AM-IF and M-IF conditions have similar strain values under the same stress levels but the specimens with as built IF have a more locally ductile region around their IF, which is confirmed by hardness test results. But this does not change global elongation behavior. The microstructural evolution starting from as-built (AB) and heat-treated (HT) samples to specimens with IF are examined. The microstructure of HT specimens has bimodal grain structure with d phase while the AB specimens display a very fine dendritic microstructure with the presence of carbides. Although they both have close values, machined specimens have a higher frequency of finer grains based on SEM images.
Originality/value
It was shown that the concurrent creation of the IF during AM can provide a final part with a preserved ultimate tensile strength and elongation but a decreased yield strength. The variation in UTS of AM-IF increases due to the surface roughness near the internal feature as compared to smooth internal surfaces in M-IF. Hence, the outcomes of this study are believed to be valuable for the industry in terms of determining the appropriate production strategy of parts with IF using AM and postprocessing processes.
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The purpose of this paper is to show the importance of policy discussions on the role of governance in limiting excessive risk-taking at times of turmoil.
Abstract
Purpose
The purpose of this paper is to show the importance of policy discussions on the role of governance in limiting excessive risk-taking at times of turmoil.
Design/methodology/approach
Corporate governance measures are regressed on measures of risk taking using a sample of US bank holding companies (BHCs) during 2002-2014.
Findings
Results show that BHCs with more concentrated shareholders, more managerial ownership, smaller boards, and less outside directors undertake less risky investments with respect to total assets, loans, and off-balance-sheet items. Capital adequacy effect is overpowering pushing for more risky positions. Finally, banks with good governance push for less risky positions, even with larger capital ratios, during the financial crisis period relative to the precrisis boom.
Practical implications
This paper extends research on the association between bank ownership structure and risk taking. It adds to prior research by examining a key feature of banks, namely, their bank-specific capital adequacy. The relevance of this study stems from recent initiatives undertaken by the Basel Committee, the Group of Thirty (G30), and bank regulators to address deficient corporate governance structures that led to bank breakdowns.
Originality/value
One of the innovations of this paper is the use of risk-weighted measures to proxy for risk taking in banks, using risk weights used by bank regulators to adjust for operational risk, credit risk, and market risk.
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Jie Ma, Zhibin Lin and Chi Keung Lau
The purpose of this paper is to develop a better understanding of how Sino-Japanese joint ventures implemented the three Japanese improvement methods, i.e. Kaizen, Kaikaku and…
Abstract
Purpose
The purpose of this paper is to develop a better understanding of how Sino-Japanese joint ventures implemented the three Japanese improvement methods, i.e. Kaizen, Kaikaku and Kaizen Blitz. The specific objectives of this study are to identify the key enablers for the three improvement methods; and to identify the most selected improvement method.
Design/methodology/approach
This study employs a fuzzy analytic hierarchy process to pairwise-compare the three improvement methods. Data are collected from 28 industry experts from Sino-Japanese joint ventures. The study then adopts extent analysis approach for pairwise comparisons and extent analysis to obtain synthetic extent values for priority weights.
Findings
The results of the study indicate that personnel (humanware) factor enablers are the most important factor for Kaizen, whilst software factor enablers (essential rules, policies and institutional arrangements) weight second and hardware factor enablers (physical, measurable hard facts or resources) weight last. The study also reviews that Kaizen is the most selected improvement method among the three.
Research limitations/implications
The sample of this study is limited to Sino-Japanese ventures in Guangzhou, China. This study only identifies the key improvement enablers based on interviews with shop floor managers and improvement experts.
Practical implications
Practical implications are threefold: the improvement implementations should be based on factors such as regular training, incentives for motivations and shop floor management; improvement methods are transferable and standard operations may only have small effects on collecting improvement ideas; and Kaizen is the appropriate method to support long-term and process-oriented improvements.
Originality/value
This study is the first to specifically pairwise-compare the three Japanese improvement methods and to identify priorities of their key enablers in Sino-Japanese joint ventures.
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Said Elbanna, Fareed Begum and Nasrina Mauji
The distinctiveness of Japanese management practices offers invaluable insights for the strategic development and operational excellence of small and medium-sized enterprises…
Abstract
Purpose
The distinctiveness of Japanese management practices offers invaluable insights for the strategic development and operational excellence of small and medium-sized enterprises (SMEs) worldwide. Recognizing this, the purpose of this study is to explore an extensive review of the literature on Japanese SMEs. The aim is to reveal previously explored research domains and to systematically categorize the unique factors contributing to the success and challenges of SMEs. This investigation not only illuminates the peculiarities of Japanese SMEs management but also sets the stage for applying these insights globally to SMEs across diverse industries.
Design/methodology/approach
Using a systematic review approach, 63 studies on Japanese SMEs from 1996 to 2021 were identified and analyzed.
Findings
This analysis identified six critical themes in Japanese SME management: nuanced firm management practices; forefront innovation and technology; internationalization; supportive government policies; commitment to corporate social responsibility and sustainable development; and vibrant entrepreneurship. The authors also spotlight challenges like navigating global competition and adapting to rapid technological changes. These insights, alongside noted methodological gaps in existing literature, suggest fertile grounds for future research and hold significant implications for SMEs globally.
Originality/value
The investigation of Japanese SMEs in this study highlights valuable insights for SMEs, policymakers and scholars, as it represents a rich and distinctive research phenomenon with various organizational, cultural, economic and political implications.
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Zhifang Wang, Jianguo Yu and Shangjing Lin
To solve the above problems and ensure the stability of the ad hoc network node topology in the process of wireless signal transmission, this paper aims to design a robust…
Abstract
Purpose
To solve the above problems and ensure the stability of the ad hoc network node topology in the process of wireless signal transmission, this paper aims to design a robust adaptive sliding film fault-tolerant controller under the nonlinear distortion of signal transmission in an amorphous flat air-to-ground wireless ad hoc network system.
Design/methodology/approach
This paper designs a robust adaptive sliding film fault-tolerant controller under the nonlinear distortion of signal transmission in an amorphous flat air-to-ground wireless ad hoc network system.
Findings
The simulation results show that the amorphous flat wireless self-organizing network system has good nonlinear distortion fault-tolerant correction ability under the feedback control of the designed controller, and the system has the asymptotically stable convergence ability; the test results show: the node topology of the self-organizing network structural stability is significantly improved, which provides a foundation for the subsequent realization of long-distance transmission of ad hoc network nodes.
Research limitations/implications
Because of the chosen research approach, the research results may lack generalizability. Therefore, researchers are encouraged to test the proposed propositions further.
Originality/value
The controller can extract the fault information caused by nonlinear distortion in the wireless signal transmission process, and at the same time, its feedback matrix K can gradually converge the generated wireless signal error to zero, to realize the stable transmission of the wireless signal.