Search results

No‐clean flux printed board appraisal tests were conducted with all materials used in the production process. Metallic growths during environmental testing revealed that there was incompatibility between some materials used. Initial tests with two solder resists and several fluxes showed that one non solder resisted board, soldered using a synthetically activated (SA) flux, had surface insulation resistance (SIR) two decades higher than those using low solids flux (LSF) or other SAs. For boards with solder resist, the SIR of those soldered using LSFs was higher, however, than those using SA fluxes. SIR dependence on temperature and humidity was investigated. Results demonstrated that the dominant factor to determine the SIR of a no‐clean board was the characteristics of the board substrate finish. SIR changes with condensation were logged and found to be significant for solder resist finishes. Tests proved that reducing the contamination levels under and on top of the solder resist, by using hot de‐ionised water rinsing, enabled the calculated minimum SIR level to be achieved for spray fluxed boards and minimised the possibility of metallic growth. Visual examination proved to be at least as important as SIR testing. No‐clean processes were appraised using sequential environmental conditions with differing SIR pass levels. As a result of this appraisal a maximum ionic contamination level of 0·5 μg/cm2 NaCl equivalent and Dl water rinses, before and after solder resist added, will be introduced. Ionic contamination tests indicated that contamination levels reduced with elapsed time, probably due to ionic molecules locking more firmly into the board surface structure. A novel method for SIR measurements at any voltage, developed by the author, is described. It is hoped that this paper will further the understanding of no‐clean flux issues and highlight potential solutions and pitfalls.

This study aims to analyze the convergence of environmental degradation clubs in the Association of Southeast Asian Nations (ASEAN). In addition, this study also analyzes the influence of renewable energy and foreign direct investment (FDI) on each club as an intervention to change the convergence pattern in each club.

This study analyzes the club convergence of environmental degradation in an effort to find out the distribution of environmental degradation reduction policies. This study uses club convergence with the Phillips and Sul (PS) convergence methodology because it considers multiple steady-states and is robust. This study uses annual panel data from 1998 to 2020 and ASEAN country units with ecological footprints as proxies for environmental degradation. After obtaining the club results, the analysis continued by analyzing the impact of renewable energy and FDI on each club using panel data regression and the Stochastic Impacts by Regression on Population, Affluence and Technology model specification.

Based on club convergence, ASEAN countries can be grouped into three clubs with two divergent countries. Club 1 has an increasing pattern of environmental degradation, while Club 2 and Club 3 show no increase. Club 1 can primarily apply renewable energy to reduce environmental degradation, while Club 2 requires more FDI. The authors expect policymakers to take into account the clubs established to formulate collaborative policies among countries. The result that FDI reduces environmental degradation in this study is in line with the pollution halo hypothesis. This study also found that population has a significant effect on environmental degradation, so policies to regulate population need to be considered. On the other hand, increasing income has no effect on reducing environmental degradation. Therefore, the use of renewable energy and FDI toward green investment is expected to intensify within ASEAN countries to reduce environmental degradation.

This research is by far the first to apply PS Club convergence to environmental degradation in ASEAN. In addition, this study is also the first to analyze the influence of renewable energy and FDI on each club formed, considering the need for renewable energy use that has not been maximized in ASEAN.

Rapid feedback on the effect of changes in materials or assembly process parameters on solder joint quality is essential in process optimisation for fine pitch surface mount solder assembly. This is particularly the case where the demands of high volume production do not allow lengthy experimentation to be carried out on the production line. The greater precision and care required in analysis of fine pitch solder joints places a further constraint on the speed at which the analysis can be carried out. The techniques of microstructural analysis, solder joint mechanical strength testing and short duration environmental stress testing must be used to meet a rapid turnaround quality and reliability analysis requirement and to maximise the amount of information obtained from each stage of the analysis. Three case studies are detailed which demonstrate the use of these techniques in a high volume production context to provide rapid feedback on joint quality. The case studies have been selected for presentation not only to demonstrate the analysis techniques but also because they address issues which are of current interest due to the increased usage of fine pitch packages in production and the constraints on the use of solvents for cleaning of circuit boards. The studies are:

This article comprises Chapter 6 from the recently published book ‘An Engineer’s Guide to Flexible Circuit Technology by J. Fjelstad

The challenge presented by advanced package development in the past five years has further accentuated the constant need for package quality and reliability monitoring through extensive laboratory testing and evaluation. As pin counts and chip geometries have continued to increase, there has been additional pressure from the military and commercial sectors to improve interconnect designs for packaged chips, including chips directly attached to the printed wiring board (PWB). One of the options employed has been tape automated bonding (TAB). However, this assembly technique also presents new standardisation, qualification and reliability problems. Therefore, at Rome Air Development Center (RADC), there is regular assessment (through in‐house failure analysis studies) of parts destined for military and space systems. In addition, Department of Defense (DoD) high tech development programmes, such as very high speed integrated circuits (VHSIC), have utilised all present screening methods for package evaluation, and have addressed the need for development of more definitive non‐destructive tests. To answer this need, two RADC contractual efforts were awarded on laser thermal and ultrasonic inspection techniques. Through these package evaluations, a number of potential reliability problems are identified and the results provided to the specific contractors for corrective action implementation. Typical problems uncovered are lid material and pin corrosion, damage to external components and adhesion problems between copper leads and polyimide supports, hermeticity failures, high moisture content in sealed packages and particle impact noise detection (PIND) test failures (internal particles). Further tests uncover bond strength failures, bond placement irregularities, voids in die attach material (potential heat dissipation problems), and die surface defects such as scratches and cracks. This presentation will review the specific package level physical test methods that are employed as a means of evaluating reliable package performance. Many of the tests, especially the environmental tests—e.g., salt atmosphere and moisture resistance—provide accelerated forms of anticipated conditions and are therefore applied as destructive tests to assess package quality and reliability in field use. In addition to a manufacturer's compliance with designated qualification procedures, the key to package quality lies in utilising good materials and well‐controlled assembly techniques. This practice, along with effective package screen tests, will ensure reliable operation of very large scale integration (VLSI) devices in severe military and commercial environment applications.

This paper aims to investigate the link between a sustainable supply chain and companies’ financial performance (FP) and provide empirical evidence about the relationship between these two constructs. This link is an important, but still unclear, subject.

Multivariate measures of sustainable supply chain performance and companies’ FP are used for Granger causality tests on a large, diverse sample of 3,900 companies in a time frame of eight years (2004-2011).

Results indicate general bidirectional causality between sustainable supply chain performance and companies’ margins and revenue. However, the link between firms’ profitability and sustainable supply chain performance is unidirectional. In addition, the recent financial crisis altered this link between the studied constructs. Finally, a wide diversity in relationship patterns between sustainable supply chain performance and companies’ FP emerges when the full sample is divided into different geographical regions and economic sectors as specified by the Global Industry Classification Standard system.

This research makes recommendations for improving several processes, such as stakeholder evaluation of the sustainable supply chain performance of companies worldwide and manager testing of environmental policy outcomes.

Building on the mostly qualitative literature on sustainable supply chain performance and companies’ FP, this research provides quantitative evidence of the gaps between these constructs. This research contributes to the discussions of supply chain management, environmental practices and the drivers of companies’ environmental and financial success.

Responses to environmental uncertainty have included designating marketing units to interface with the environment to enable manufacturing units to operate in conditions approximating certainty. If buffering is effective, the impact of environmental uncertainty should be lower and conditions may be more suitable for a greater reliance on budgetary control in manufacturing than in marketing departments. The objectives of this study are to first, assess if there is a difference in the level of environmental uncertainty between these functions. Second, to evaluate if the relation between reliance on budgetary control and unit performance is influenced by departmental function. Third, since function and environmental uncertainty are unlikely to be perfectly correlated, if environmental uncertainty influences that relation. The results suggest that there is no difference in the level of environmental uncertainty or reliance on budgetary control between manufacturing and marketing departments. Furthermore, the findings suggest that reliance on budgetary control is no more effective in enhancing performance in either unit category. On relaxing the presumption that function proxied for environmental uncertainty, it was found that reliance on budgetary control is more effective in enhancing performance in conditions of low rather than high environmental uncertainty.

Using data from 236 Mexican manufacturing facilities, we examine the relationship between management control systems and structures and environmental compliance and we test the applicability of management control theory in Mexican industry. We report that success in compliance with environmental regulations is significantly associated with degree of management commitment, planning, belief systems, measurement systems, and rewards. This study contributes to the management control literature by empirically testing the efficacy of management control systems and structures in Mexican industry. It contributes evidence about the implementation of environmental strategies in organizations. Finally, by focusing our analysis on Mexican companies, it gives us a rare view of management control and strategy implementation in a developing economy.

The purpose of this paper is to analyze the interaction between internal factors of corporate governance, especially the relationship between equity checks and balances and corporate social responsibility (CSR), and further analyze the mediating of green innovation performance and the moderating role of environmental uncertainty.

This study adopts a sample of Chinese A-share listed companies on the Shanghai and Shenzhen stock exchanges from 2012 to 2020 constructed a regulated mediation effect model, empirically tests the impact of equity checks and balances on CSR and the mediation and mediator roles of green innovation performance and environmental uncertainty.

(1) Equity checks and balances among shareholders have a significant positive impact on CSR. (2) Equity checks and balances have a positive impact on green innovation performance, green innovation performance has a positive impact on CSR and green innovation performance plays a partial mediation effect between equity checks and balances and CSR. (3) Additionally, environmental uncertainty not only moderates the relationship between Green Innovation Performance and CSR but also moderates the direct effect between equity balance and CSR, which verifies the existence of a moderated mediation effect.

The study only considers listed companies on the Shanghai and Shenzhen stock markets as the research sample and does not include unlisted and gem enterprises.

The present research can offer some managerial implications about implementing equity checks and balances among shareholders, actively fulfilling CSR and developing new products.

This study complements previous studies on the role of green innovation in corporate governance by exploring the impact of green innovation on equity checks and balances and CSR. And this study explores the dynamic moderating of environmental uncertainty within enterprises and provides another explanation for the mixed results of equity checks and balances, green innovation performance and CSR.

By demonstrating the influence of the ownership structure of A-shares listed companies on CSR, this paper provides a new and comprehensive theoretical framework to examine the interaction between equity checks and balances, green innovation performance, environmental uncertainty and CSR. The results can be used as a reference for corporate governance, improving innovation performance and fulfilling CSR.