Daniel A. Porter, Nicholas Davis, Paul S. Krueger, Adam L. Cohen and David Son
Techniques of extrude and cure additive manufacturing for thermally cured, high viscosity and medical-grade silicone are investigated by using a small ram extruder and a…
Abstract
Purpose
Techniques of extrude and cure additive manufacturing for thermally cured, high viscosity and medical-grade silicone are investigated by using a small ram extruder and a near-infrared (IR) laser. The purpose of this study is to evaluate the process parameter effects on the stiffness of the final products.
Design/methodology/approach
Process parameter effects on axial stiffness values and durometer are explored. Parameters such as extrusion layer height, laser speed, laser current, laser raster spacing and multiple laser passes were investigated and compared to traditional cast and cure methods. Dimensional changes were also recorded and compared.
Findings
Tensile and durometer tests show that certain curing parameters give tensile stress and durometers within 10 per cent of bulk material specifications at 200 per cent strain. Parameters that had the highest impact on tensile stress at 200 per cent strain were layer height (0.73 per cent) followed by laser power (0.69 per cent), and then laser raster spacing (0.45 per cent). Parameters that had the highest impact on durometer were laser power (1.00 per cent), followed by layer height, (0.34 per cent) and then laser raster speed (0.32 per cent). Three-dimensional printed samples had about 11.2 per cent more shrinkage than the bulk cast samples in the longest dimension.
Originality/value
This paper is one of the first that demonstrates near IR laser curing parameter effects on three-dimensional printed, commercial off-the-shelf, medical-grade and viscous silicone. The ability to cure very viscous thermosets locally enables interesting technologies such as wire encapsulation, high voltage actuators and drug delivery devices.
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This study finds evidence that a stock return is inversely correlated with downside risk, confirming a pattern of risk-aversion behavior. Evidence from testing a stock return's…
Abstract
This study finds evidence that a stock return is inversely correlated with downside risk, confirming a pattern of risk-aversion behavior. Evidence from testing a stock return's response to a change in economic policy uncertainty indicates a significantly negative effect in the Chinese stock market; this conclusion holds true for testing the impacts of changes in fiscal and monetary policy uncertainties. However, the data produce a mixed effect for the change in fiscal policy uncertainty. The evidence produced from examining the geopolitical effect on the stock market strongly supports the presence of an adverse effect on stock market performance.
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A.N. Zainab, A.R. Huzaimah and T.F. Ang
The purpose of this research is to examine users preference and use of electronic journals in general, especially those published in a hosting system, Electronic Journal of the…
Abstract
Purpose
The purpose of this research is to examine users preference and use of electronic journals in general, especially those published in a hosting system, Electronic Journal of the University of Malaya (EJUM)
Design/methodology/approach
The study utilized the survey method and employed an online questionnaire as the data collection instrument. A list of 330 users who registered with EJUM was selected and an e‐mail was sent to each with an invitation to complete the survey form linked to their mail. A total of 140 responses were returned, out of which 102 responses were usable.
Findings
The electronic journals are used for searching new information, reading full‐text articles, reading abstracts, and browsing the table of contents. Users are led to EJUM by chance while browsing the internet (41.8 per cent) when searching using Google, through citations obtained from conference papers, from articles or citations in databases. About 50 per cent of respondents rated the journals as “good” and 20.6 per cent rated “fair”. Respondents prefer keywords (28.9 per cent) and title (24.3 per cent) searches. The majority of respondents (70 per cent) prefer articles in PDF. The majority of respondents read the abstracts first to determine relevance before downloading the articles. Respondents believe that electronic journals will either co‐exist with print journals (46.2 per cent) or replace the print journals (25.5 per cent) or supplement (25.5 per cent) them. Users indicate the functions and features preferred in electronic journals.
Practical implications/limitations
A HTML indexing page is created to automatically harvest the meta labels from the contents pages of journal issues, which is captured by Googlebot of Google Scholar. This strategy improves accessibility as Google Scholar provides citation and publication counts for articles and authors. A quality matrix for an electronic journal system is presented
Originality/value
The study shows the extent to which e‐journals are used in Malaysia and provides a matrix of usability features which potential electronic journal publishers could consider.
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Darren Good, Bauback Yeganeh and Robin Yeganeh
Traditional clinical psychological practices have often been adapted for the context of executive coaching. Cognitive behavioral therapy (CBT) in particular is the most…
Abstract
Traditional clinical psychological practices have often been adapted for the context of executive coaching. Cognitive behavioral therapy (CBT) in particular is the most scientifically supported psychological modality. CBT like other practices has been used in coaching as cognitive behavioral coaching but rarely discussed more explicitly for the executive population. Here, we offer a specific adaptation – cognitive behavioral executive coaching (CBEC) – and suggest that it presents a flexible structure that can meet the multiple agendas that are framed for executive coaching. Additionally, the core features of CBT and CBEC in particular satisfy the major needs of executives in coaching arrangements. We conclude by demonstrating a CBEC process model for coaching the high-performing executive.
New Derwent representation in North America. Effective mid July, 1981, Derwent Publications Limited will be represented in the USA and Canada by a new company:
Hamid R. Jamali, David Nicholas and Paul Huntington
To provide a review of the log analysis studies of use and users of scholarly electronic journals.
Abstract
Purpose
To provide a review of the log analysis studies of use and users of scholarly electronic journals.
Design/methodology/approach
The advantages and limitations of log analysis are described and then past studies of e‐journals' use and users that applied this methodology are critiqued. The results of these studies will be very briefly compared with some survey studies. Those aspects of online journals' use and users studies that log analysis can investigate well and those aspects that log analysis can not disclose enough information about are highlighted.
Findings
The review indicates that although there is a debate about reliability of the results of log analysis, this methodology has great potential for studying online journals' use and their users' information seeking behaviour.
Originality/value
This paper highlights the strengths and weaknesses of log analysis for studying digital journals and raises a couple of questions to be investigated by further studies.
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This study aims to empirically examine how economic policy uncertainty emanating from three major global economic blocks (the US, the Chinese and the European Union) and…
Abstract
Purpose
This study aims to empirically examine how economic policy uncertainty emanating from three major global economic blocks (the US, the Chinese and the European Union) and volatility in global oil prices influence international trade.
Design/methodology/approach
The study uses quarterly data spanning the period between 1995 and 2014 in an autoregressive distributed lag framework.
Findings
This study finds that economic policy uncertainty conditions associated with the US and the Chinese economies tend to have significant negative or constraining impact on key components of international trade. Further analysis suggests that between the two leading economies (the US and the Chinese economies), economic policy uncertainty emanating from the US economy tend to have much more constraining impact on dynamics of international trade than the Chinese economy all things being equal.
Practical implications
This study’s findings carry significant strategic planning and policy implications for international trade dependent firms or corporations and economies. For instance, for multi-national corporations or firms whose products and services depend heavily on cross-border trade, understanding and taking into consideration prevailing economic policy dynamics emanating from the US and the Chinese economies in product and services demand forecast, and other strategic moves could be critical in minimizing potential adverse effects on projected performance or growth targets.
Originality/value
The uniqueness of this study’s approach stems from its assessment of how perception of uncertainty among economic agents about economic policies originating from three noted global economic blocks impacts international trade. In other words, instead of traditional factors or conditions surmised to influence variability in trend associated with international trade found in related studies, this study rather examines how perceptions of uncertainty about prevailing or yet to be enacted economic policy within specific global economic block impacts international trade.
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NICHOLAS NASH and WILLIAM J. DAVIS
A continuing limitation of survey research is the problem of non‐response. Survey research is also likely to be more, rather than less, troubled by the surprising upsurge in the…
Abstract
A continuing limitation of survey research is the problem of non‐response. Survey research is also likely to be more, rather than less, troubled by the surprising upsurge in the use of more complex prevarication systems. In a searching examination of the results of their survey authors Nash and Davis categorize prevarication statements made by professors and by their secretaries. More detailed analysis reveals three categories of prevarication systems—the red tape rationale, the elegant kafuffle and the competency‐based cookie crumbier.
Gikas Hardouvelis, Georgios Karalas, Dimitrios Karanastasis and Panagiotis Samartzis
The authors construct an index of economic policy uncertainty (EPU) for Greece using textual analysis and analyze its role in the 10-year Greek economic crisis.
Abstract
Purpose
The authors construct an index of economic policy uncertainty (EPU) for Greece using textual analysis and analyze its role in the 10-year Greek economic crisis.
Design/methodology/approach
To identify the causal relationship between various measures of economic activity and EPU in Greece, the authors use a sophisticated “shock-based” structural vector autoregressive identification scheme. Additionally, the authors use two additional models to ensure the robustness of the results.
Findings
EPU is negatively associated with domestic economic activity and economic sentiment, and positively with bond credit spreads. EPU is also estimated to have prolonged the crisis even in periods when macroeconomic imbalances were cured. The results are robust across various model specifications and different proxies of economic activity.
Originality/value
Brunnermeier (2017) observed that uncertainty may be central to understanding the evolution of the Greek crisis. Yet little attention has been paid to policy uncertainty in the existing long and growing literature on the Greek crisis. The authors attempt to fill this gap.
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Nenavath Sreenu and Ashis Kumar Pradhan
The stock market has shown fluctuating degrees of volatility because of the recent COVID-19 pandemic in India. The present research aims to investigate the effect of the COVID-19…
Abstract
Purpose
The stock market has shown fluctuating degrees of volatility because of the recent COVID-19 pandemic in India. The present research aims to investigate the effect of the COVID-19 on the stock market volatility, and whether the economic package can control the market volatility or not, measured by a set of certain sector-level economic features and factors such as resilience variables.
Design/methodology/approach
We examine the correlation matrix, basic volatility model and robustness tests to determine the sector-level economic features and macroeconomic factors helpful in diminishing the volatility rising because of the COVID-19.
Findings
The outcomes of this study are significant as policymakers and financial analysts can apply these economic factors to set policy replies to handle the unexpected fluctuation in the stock market in sequence to circumvent any thinkable future financial crisis.
Originality/value
The originality of the paper is to measure the variables affecting the stock market volatility due to COVID-19, and understand the impact of capital market macroeconomic variables and dummy variables to theoretically explain the COVID-19 impact on stock market volatility.