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The purpose of this paper is to investigate the tribological properties of liquid paraffin with SiO₂ nanoparticles additive made by a sol‐gel method.

The tribological properties of the SiO₂ nanoparticles as an additive in liquid paraffin are measured using a ball‐on‐ring wear tester to determine the optimal additive concentration. The mechanism that wear and friction are reduced is studied using scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), and atomic force microscope (AFM).

Experimental results indicate that the sizes of the synthesized SiO₂ nanoparticles are distributed uniformly and that the optimal concentrations of SiO₂ nanoparticles in liquid paraffin is associated with better tribological properties than pure paraffin oil, and an anti‐wear (AW) ability that depends on the particle size.

It is shown in the paper that by reducing friction and AW, the lubricant prepared by the methods described can prolong operating hours of machinery.

Online learning is increasingly popular, and educational platforms provide a wealth of courses. Improving course sales is the key to promoting sustainable development of online course platforms. However, limited research has explored the marketing of online courses. We study how to drive online course sales by leveraging teacher information.

We performed an empirical study. We collected data through a crawler and image recognition from Tencent classroom.

Our results show that providing teacher information and profile images helps promote online course sales. However, detailed course descriptions weaken the positive impact of teachers' profile images on online course sales. Furthermore, our study shows an inverted U-shaped relationship between the intensity of smiling in teacher profile photos and online course sales, and teacher descriptions negatively moderate this relationship.

Our study contributes to the research on online course sales and extends the context of the research on smiling as well as the studies of visual and textual information.

The results have practical implications for online course sellers and platforms.

Existing scholarly efforts have explored online courses mainly from an education perspective. More research is needed to advance the understanding of online course sales. Our study advances research in the marketing of online courses.

The purpose of this study is to address two kinds of printed circuit board (PCB) failures with electrolytic Ni/Au as the surface finish. One was the weak bondability of gold wires to Ni/Au pads and the other was “dull gold” and weak solder wettability, which both caused great loss for the PCB manufacturer.

The failure samples were studied and analyzed in terms of macro- and micro-morphology of the surface finish, its element composition and thickness by various characterization techniques, such as three-dimensional stereo microscope, scanning electron microscope, energy dispersive spectroscopy and X-ray fluorescence spectrum.

Then the causes of the two failures were both found to be the inadequate thickness of gold deposit and other surface finish defects, but these causes played different roles in either failure or the mechanisms differ. Finally, their failure mechanisms were discussed and corresponding countermeasures were put forward for prevention.

This study not only addresses a practical failure problem but also provides some clues to a better and further understanding of the effect of PCB process and management on its quality and reliability in manufacturing practice.

It sheds light on how the thickness and quality of surface finish affects its wire bonding and soldering performances.

The purpose of this study is to deepen the understanding of the effects of information technology (IT) investment on firm innovation performance and examining the investment paradox effect in China.

Using a sample of China’ public firms IT investment data between 2010 and 2016, the authors establish a test model of IT investment and innovation performance.

The result indicates that IT investment in firms have no effect on innovation performance in the investment period. However, in the full sample and manufacturing sample, the IT investment has a significant positive effect on innovation performance in the post-investment years. In addition, this study finds that large companies and low-age companies may contribute more to innovation when firm investment in IT.

There are several limitations in this research. First, the authors are failed to obtain a larger sample about the IT investment information data set in China, so this study was compelled to use limited sample data from China, hence, this could lead to errors of too early generalization. Second, the authors use the number of invention patent applications to represent the performance of enterprise innovation, which may not show enterprise innovation effectively. Third, the firms in the sample are all in China Listed Companies, so this may not accurately reflect the entire environment of firm innovation performance, and could possibly.

The research confirms that there is a paradox and time lag effect in IT investment, which enterprises should pay attention to.

Existing research confirms that corporate IT investments can bring new products or services. However, the authors still do not know whether IT investment has improved the company’s ability of innovation. This study will fill this gap and the industry effect and time lag effect of the influence of IT investment on innovative performance are also examined.

This paper aims to compare the Greek and Chinese rhetorical traditions and explore their influences on today’s business and marketing communication across relevant cultures. In particular, it uses the Aristotelian persuasive orientations as reference points to introduce the Chinese rhetoric, and interpret cultural differences in persuasion from a historical and sociocultural perspective. It has been found that Greek and Chinese rhetoric and persuasion were developed to meet the needs of the social and cultural environments and this rule still applies to today’s business communication. The logical approach has been emphasised in the English rhetorical tradition while both qing (emotional approach) and li (logical approach) are the focus of persuasion in the Chinese tradition. This difference is also the root of cultural differences in modern business communication. Findings from both English and Chinese texts and data are examined to substantiate our focal argument.

The purpose of this paper is to utilise a sample of 384 small and medium-sized enterprises (SMEs) who applied for external finance in the Beijing area of China to investigate the characteristics of firms against: the amount of external finance sought, the amount received, and the proportion of external finance which was received from the sought finance.

The authors use a survey of SMEs in Beijing, China, undertaken between July and December 2007 where a response rate of 37.67 per cent was obtained. The survey was translated from English to Chinese, and then back translated from Chinese to English by academics with input from businesses. The sample of 384 firms is robust.

Overall, there is little evidence in the sample of Chinese SMEs that innovative firms face discrimination from providers of credit. However, where innovation is measured by inputs (specifically R & D), providers of credit appear less comfortable. Three other factors were more important and were statistically significant at the 5 per cent level. For example, exporters were less likely to receive a greater proportion of their sought finance; and manufacturing firms were more likely than service sector firms, and limited liability companies were more likely than extended sole proprietorship firms to obtain a greater proportion of the external finance which they sought.

The sample for the research is from Beijing. Researchers may extent and role out the research to other parts of China.

Practically, the authors explore variations in firm-level characteristics by: the amount of external finance sought, the amount of external finance received, and the ratio of “sought” to “received” external finance. In this way, the research questions are concerned with understanding which “types” of firms seek most bank finance, and which are most successful. This information is of benefit to SMEs, policy makers and those who work in the finance industry.

Access to finance is a cause of stress and anxiety to many SMEs. A greater understanding of the accessing of finance in Beijing China will allow entrepreneurs to be better placed to reflect upon their businesses and their suitability to pursue finance. This can help the economic and social well-being of entrepreneurs and their employees.

There are comparatively few large scale surveys which have been undertaken of access to finance by SMEs in China, and within this field there is very little research which has been undertaken to look at innovators and non-innovators. The results allow us to have a better understanding of how much finance SMEs in Beijing are seeking, obtaining, and the proportion of finance received from that sought, and the extent to which innovation and other business and owner-manager characteristics are influential.