Marius Rutkevičius, Jimmy Dong, Darren Tremelling, Julia Viertel and Samuel Beckford
Low friction polymer coatings able to withstand high loadings and many years of continuous operation are difficult to formulate at low cost, but could find many applications in…
Abstract
Purpose
Low friction polymer coatings able to withstand high loadings and many years of continuous operation are difficult to formulate at low cost, but could find many applications in industry. This study aims to analyze and compare friction and wear performance of novel polydopamine/polytetrafluoroethylene (PDA/PTFE) and traditional tin Babbitt coatings applied to an industrial journal bearing.
Design/methodology/approach
This paper tested PTFE based coating, co-deposited with PDA, a biopolymer allowing sea mussels to adhere to ocean rocks. This coating was deposited on flat steel substrates and on a curved cast iron hydrodynamic journal bearing surface. The flat substrates were analyzed with a tribometer and an optical microscope, while the coated bearing liners were tested in an industrial laboratory setting at different speeds and different radial loads.
Findings
PDA/PTFE coating showed 2-3 times lower friction compared to traditional tin Babbitt for flat substrates, but higher friction in the bearing liners. PDA/PTFE also showed considerable wear through coating delamination and abrasion in the bearing liners.
Research limitations/implications
Five future modifications to mitigate coating flaws are provided, which include modifications to coating thickness and its surface finish.
Originality/value
While the novel coating showed excellent results on flat substrates, coating performance in a large scale bearing was found to be poor. This study shows that coating preparation needs to be improved to avoid frictional losses and unwanted damage to bearings. We provide several routes that could improve coating performance in industrial applications.
Details
Keywords
National cultural heritage months often highlight superficial elements such as food, arts, crafts, and music, but behind these celebrations lie generations of pioneers who have…
Abstract
National cultural heritage months often highlight superficial elements such as food, arts, crafts, and music, but behind these celebrations lie generations of pioneers who have shaped the historical and cultural heritage of America. Over the past seven years, in championing cultural awareness, the San Francisco Public Library has collaborated with the Asian American Studies Department at San Francisco State University, The Association of Chinese Teachers, and other community organizations to commemorate Asian Pacific Islander American (APIA) Heritage Month every year in May. This annual program illustrates how efforts led by APIAs have contributed to the historical, cultural, and literary landscape of America, affording them the recognition they deserve. Multicollaborative efforts led to the creation of a premiere APIA Biography Project (apiabiography.sfsu.edu) – a digital repository of instructional resources that educators across the nation can adapt to their curriculum. By bridging collaboration, public engagement, and community partnerships, public libraries unify multiple constituencies to educate the public on the diverse communities they serve.
Details
Keywords
This research investigates the market for Western clothing in Vietnam, one of the most under‐developed countries of South East Asia. The intention is to look at factors which will…
Abstract
This research investigates the market for Western clothing in Vietnam, one of the most under‐developed countries of South East Asia. The intention is to look at factors which will assist economic development in Vietnam because economic growth generally leads to greater GDP per capita and this in turn leads to greater spending per capita on clothing. The country is making use of direct foreign investment (DFI) from the ‘Asian Tigers’ to modernise its industry. The lighter manufacturing industries, which include apparel, are expected to benefit. The population of Vietnam welcome this investment and the employment it is creating, and as the labour force changes from agrarian to urban the GDP is expected to rise. This rudimentary clothing industry is being established in Vietnam mainly to supply the markets in Asia but there are indications that there is a growth of local demand for western clothing. In this research the access to retail western clothing in Vietnam is explored from both secondary and primary data sources, and, conclusions drawn incorporating the economic prospects for the future size of the market. The results of the research show that although the country is experiencing strong growth now and there is demand for western clothing the future market will be small.
Details
Keywords
In this paper I analyze Sex and the City as performances of contemporary post-modern culture of femininity and engage in a multi-modal, semiotic reading of their socio-cultural…
Abstract
In this paper I analyze Sex and the City as performances of contemporary post-modern culture of femininity and engage in a multi-modal, semiotic reading of their socio-cultural significance. In particular, I argue that the same discursive formation underlies the ideology of the show: a discourse largely coinciding with the Standard North American Family Code (Smith, 1999) and therefore a discourse that stigmatizes single women and reinforces the value of marriage as both symbolic and material capital. Drawing in part from Goffman, I argue that an oppositional reading of the show also yields another interesting connotation: the show offers its viewers techniques and scripts of stigma resistance.
Yu-Ming Chung, Shao-Yu Lee, Yung-Kai Lin, Yung-Hao Lin, Mohamed El-Shazly, Yung-Hsiang Lin and Chi-Fu Chiang
Rambutan (Nephelium lappaceum), a ubiquitous fruit in Southeastern Asia, was rich in vitamins and phytochemicals, which were beneficial for improving of skin conditions. The…
Abstract
Purpose
Rambutan (Nephelium lappaceum), a ubiquitous fruit in Southeastern Asia, was rich in vitamins and phytochemicals, which were beneficial for improving of skin conditions. The fermentation process increased phytochemicals and antioxidant capacity. Thus, the purpose of this paper is to examine whether phytochemicals can be increased through the fermentation process of rambutan extracts to improve skin aging.
Design/methodology/approach
In this study, the authors used the three stages of fermentation with Saccharomyces cerevisiae, Lactobacillus plantarum TCI028 and Acetobacter aceti under red light to develop a fermented rambutan extract.
Findings
The level of polyphenols of red-light-based fermented rambutan extract (RLFRE) were significantly increased 108.9% (p < 0.01) and 97% (p <0.01) compared with fermented rambutan extract (FRE) and pure rambutan extract (RE), respectively. The human skin fibroblasts treated with 0.03 or 0.06% of RLFRE can significantly decrease reactive oxygen species (ROS) levels by 0.74- (p <0.001) and 0.84-fold (p <0.001) compared with H2O2 group, respectively. And 0.03% of RLFRE can significantly increase in elastin content by 1.13-fold (p <0.05). Also, ten compounds were identified including one new phenolic compound and nine known compounds from RLFRE. Moreover, red light could enhance the levels of compounds 4, 9 and 3 by 5, 2.5 and 2.5-fold, respectively, relative to the results of FRE. The last, RLFRE isolated compounds significantly facilitated the elastin content on fibroblast (compound 1, 7, 9, 10 compared with control: p <0.001, compound 2 compared with control: p <0.001).
Originality/value
In short, this was the first study to unveil that the red-light-based fermentation can enrich the antioxidant content in a rambutan extract and its product had the potential to be developed a functional product for health-promoting effects such as skin aging.
Details
Keywords
Yan Lin and Chenxi Wang
This paper aims to explore the effect of participant composition and contribution behavior of the different types of participants on the quality of knowledge generation in online…
Abstract
Purpose
This paper aims to explore the effect of participant composition and contribution behavior of the different types of participants on the quality of knowledge generation in online communities.
Design/methodology/approach
This study samples all the featured articles in Chinese Wikipedia and performs a Cox regression to reveal how participant composition and contribution behavior affect the quality of articles in different contexts.
Findings
The results show that an increase in the number of participants increases the possibility of either enhancing or reducing the article quality. In most cases, the greater the proportion of core members (people who frequently participate in editing), the higher the possibility of enhancing the article quality. Occasional participants’ editorial behavior hinders quality promotion, this negative effect weakens when such editorial behavior becomes more frequent.
Practical implications
The findings help to better leverage the role of online communities in practice and to achieve knowledge collaboration in a more efficient manner. For example, an appropriate centralized organizational form should be established in online communities to improve the efficiency of crowd contributions. And it is worth developing mechanism to encourage participants to frequently participate in editing the article.
Originality/value
This study contributes to the research on the organizational forms of online communities by showing the effect of participant composition and behavior in the new form of organizing on knowledge generation. This study also contributes to the research on wisdom of crowds by revealing who in a group of participants, in what context, and by what means influence knowledge generation.
Details
Keywords
This study examines a new type of corruption that has not previously been studied but that significantly affects the world. Traditionally, corruption has referred to individuals…
Abstract
Purpose
This study examines a new type of corruption that has not previously been studied but that significantly affects the world. Traditionally, corruption has referred to individuals or organizations that bribe state officials. The author examines a phenomenon in which the briber is actually the government of a country that bribes the rest of the world in order to gain influence and propose a framework to explain it.
Design/methodology/approach
A multi-case qualitative method is used to compile and analyze evidences and develop my arguments. Specifically, the author compiles information on and analyzes the Confucius Institutes, the training of future foreign leaders, influencing the influencers, the Thousand Talents Plan, the Belt and Road Initiative and foreign aid.
Findings
The findings reveal the existence of state-sponsored bribery of the world.
Social implications
State-sponsored bribery is a threat to the world. Recognizing it is the first step to curb it. Reducing the bribery by China's state will benefit the world and China.
Originality/value
State-sponsored bribery is originally defined and documented. A framework about the motivations and capabilities of state-sponsored bribery is proposed, the effects of and responses to such a bribery are reviewed, and policies to curb it are suggested.
Details
Keywords
This research outlines the Hong Kong film industry with examination of key actors, directors, films, and production companies within the martial arts genre of Hong Kong Action…
Abstract
This research outlines the Hong Kong film industry with examination of key actors, directors, films, and production companies within the martial arts genre of Hong Kong Action Cinema. Hong Kong Film Award winners and nominees, core films within genres, and core reference works both general and theoretical from experts in the field of Hong Kong martial arts film research have been highlighted. Web sites are suggested that provide reviews of Hong Kong martial arts films, biographical information on a variety of actors and actresses as well as comprehensive bibliographic information on select films. Also included are commercial Web sites that provide Hong Kong martial arts films.
Details
Keywords
Roots of global Terrorism are in ‘failed’ states carved out of multiracial empires after World Wars I and II in name of ‘national self‐determination’. Both sides in the Cold War…
Abstract
Roots of global Terrorism are in ‘failed’ states carved out of multiracial empires after World Wars I and II in name of ‘national self‐determination’. Both sides in the Cold War competed to exploit the process of disintegration with armed and covert interventions. In effect, they were colluding at the expense of the ‘liberated’ peoples. The ‘Vietnam Trauma’ prevented effective action against the resulting terrorist buildup and blowback until 9/11. As those vultures come home to roost, the war broadens to en vision overdue but coercive reforms to the postwar system of nation states, first in the Middle East. Mirages of Vietnam blur the vision; can the sole Superpower finish the job before fiscal and/or imperial overstretch implode it?
Henry H. Rossbacher and Tracy W. Young
In King Henry VIII, Cardinal Wolsey, in his final speech of expiation, urges Cromwell to act honourably, arguing: ‘corruption wins not more than honesty’. Hopefully, the radical…
Abstract
In King Henry VIII, Cardinal Wolsey, in his final speech of expiation, urges Cromwell to act honourably, arguing: ‘corruption wins not more than honesty’. Hopefully, the radical nature of this sentiment did not cause the historic burning of the Globe Theatre during the inaugural performances of the play. Just as Wolsey's recantation of his past sins and practices came a little too late with much too little, so American and, especially, international anti‐corruption efforts have been either nonexistent or, at the least, largely admonitory.