Effect of TiO2@Carbon Nanotubes and Praseodymium on the Microhardness and Corrosion Properties of AZ91 Alloy

Qianwen Ran,Hong Yan,Jiajia He,Ning Li,Yushun Lei 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.8

Effect of 1 wt% TiO2@carbon nanotubes (TiO2@CNTs) and 1 wt% praseodymium (Pr) on the microhardness and corrosionproperties of AZ91 magnesium alloy were discussed. The microhardness test, electrochemistry test that AZ91 magnesiumalloy with 1 wt% TiO2@CNTs and 1 wt% Pr addition exhibits excellent microhardness (111 HV), low corrosion currentdensity (0.165 mA·cm−2), and low polarization resistance (537.15 Ω·cm2) compared with AZ91 magnesium alloy (89 HV,0.184 mA·cm−2, 261.06 Ω·cm2). After 1 wt% TiO2@CNTs and 1 wt% Pr added to AZ91, the average crystallite size wasreduced and microhardness was increased. Additionally, the Al11Pr3phase formed by the combination of Pr and Al transformedthe morphology of β-Mg17Al12 phase into weeny particles and decreased the volume fraction of β-Mg17Al12 phase. The reduction and refinement of cathode phase (β-Mg17Al12 phase) weakened the micro-galvanic corrosion and sloweddown the corrosion rate.

Analyzing the Key Drivers of Contractors’ Temporary Competitive Advantage in the Competition of International High-Speed Rail Projects

Qianwen Zhou,Xiaopeng Deng,Ruoyu Jin,Tengyuan Chang 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.11

After temporary competitive advantage (TCA) being proposed, this concept has received a lot of attention from academia and industry. For international high-speed rail (HSR) contractors, how to form their TCA and win out over the competition for new projects is crucial, while only a few studies focus on this issue. This research aims to develop a TCA system that reflects the characteristics of HSR contractors in the corporation and project levels. At first, exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) was conducted to explore and examine the key drivers and their relationships with contractors’ TCA. The results revealed that experience-mining advantage was the most critical factor of the six common factors. Next, common factors were divided into three dimensions and discussed in-depth, including resource-based TCA (i.e., technical resource and social image) which had the highest significance, followed by performance-based TCA (experience-mining advantage and risk-controlling performance), and action-based TCA (i.e., funding strategy and organizational management). Finally, two case study projects were selected to investigate the competitive situation between CRH (China Railway High-speed) and Shinkansen (Japan) in the international HSR market. This study not only provides suggestions for contractors to improve their TCA in international HSR projects, but also contributes to the theoretical framework for the TCA theory.

Association between Metabolic Syndrome and Microvascular Complications in Chinese Adults with Type 1 Diabetes Mellitus

Qianwen Huang,Daizhi Yang,Hongrong Deng,Hua Liang,Xueying Zheng,Jinhua Yan,Wen Xu,Xiangwen Liu,Bin Yao,Sihui Luo,Jianping Weng 대한당뇨병학회 2022 Diabetes and Metabolism Journal Vol.46 No.1

Background: Both type 1 diabetes mellitus (T1DM) and metabolic syndrome (MetS) are associated with an elevated risk of morbidity and mortality yet with increasing heterogeneity. This study primarily aimed to evaluate the prevalence of MetS among adult patients with T1DM in China and investigate its associated risk factors, and relationship with microvascular complications.Methods: We included adult patients who had been enrolled in the Guangdong T1DM Translational Medicine Study conducted from June 2010 to June 2015. MetS was defined according to the updated National Cholesterol Education Program criterion. Logistic regression models were used to estimate the odds ratio (OR) for the association between MetS and the risk of diabetic kidney disease (DKD) and diabetic retinopathy (DR).Results: Among the 569 eligible patients enrolled, the prevalence of MetS was 15.1%. While female gender, longer diabetes duration, higher body mass index, and glycosylated hemoglobin A1c (HbA1c) were risk factors associated with MetS (OR, 2.86, 1.04, 1.14, and 1.23, respectively), received nutrition therapy education was a protective factor (OR, 0.46). After adjustment for gender, age, diabetes duration, HbA1c, socioeconomic and lifestyle variables, MetS status was associated with an increased risk of DKD and DR (OR, 2.14 and 3.72, respectively; both P<0.05).Conclusion: Although the prevalence of MetS in adult patients with T1DM in China was relatively low, patients with MetS were more likely to have DKD and DR. A comprehensive management including lifestyle modification might reduce their risk of microvascular complications in adults with T1DM.

Friction-induced vibration of marine propeller shaft based on the LuGre friction model

Qianwen Huang,Jing Xia,Huaiguang Liu 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.8

The friction-induced vibration with stick-slip behavior is caused by the contact of the shaft-bearing system. A LuGre friction model is thus applied in the investigation of frictioninduced vibration of the marine propeller shaft. The model parameters contain Coulomb friction, stiction force, Stribeck velocity and viscous coefficient are obtained through fitting curves of friction with experimental data in published papers. The dynamical response of a marine propulsion system is measured with an experiment and calculated with the Stribeck model to verify the adaptation of the LuGre friction model in the friction-induced vibration. To capture the nature of the LuGre friction model, the velocity-dependent function, friction coefficient, pre-sliding displacement, hysteresis, break-away force and dynamical response are numerically calculated. The impact factors include relative velocity, tangential force, and rotational speed are discussed with specific comparison. Therefore a suitable model focusing on the friction-induced vibration is proposed for the marine propeller shaft.

Association between Metabolic Syndrome and Microvascular Complications in Chinese Adults with Type 1 Diabetes Mellitus (Diabetes Metab J 2022;46:93-103)

Qianwen Huang,Sihui Luo 대한당뇨병학회 2022 Diabetes and Metabolism Journal Vol.46 No.3

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Developing the Framework of Tacit Knowledge Externalization in International Construction Projects

Qianwen Zhou,Xiaopeng Deng,Bon-Gang Hwang,Xianbo Zhao,Na Zhang 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.9

Although tacit knowledge management has gained increasing attention in international construction projects, little effort has been devoted to the externalization of tacit knowledge for project managers and members. This research aims to explore various factors that affect the process of tacit knowledge externalization (TKE) in international construction projects and analyze the influencing mechanism and degree of these factors on the externalization effect. Based on the comprehensive literature review and in-depth investigations, a theoretical model and ten hypotheses were established. Then, data collected from 302 respondents were used to test the model and hypotheses. The results indicated that the differences among project members (i.e., culture distance and knowledge distance) reduce members’ willingness to convert tacit knowledge, which negatively impacts the externalization effect. Furthermore, organizational management (i.e., organizational climate and incentive mechanism) plays an active role in increasing members’ externalization willingness. Incentive mechanism and information technology are beneficial to increasing the coding level of knowledge, which positively impacts the externalization effect. Moreover, a strong willingness to convert tacit knowledge helps enhance the coding level of knowledge, thereby improving the effect of TKE. This study advances previous research by developing a framework for TKE in international construction projects, thereby offering recommendations for project managers and members to promote the externalization process.

Are the PRC BITs Applicable to China’s Special Administrative Regions? In Consideration of the Sanum v. Laos case

Qianwen Zhang 이준국제법연구원 2016 China and WTO Review Vol.2 No.1

Acupuncture combined with speech rehabilitation training for post-stroke dysarthria: a systematic review and meta-analysis of randomized controlled trials

Qianwen Xie,Xueyin Chen,Jingmin Xiao,Shaonan Liu,Lihong Yang,Jing Chen,Jiaqi Lai,Rui Lan,Yi Chen,Haifang Yang,Xinfeng Guo 한국한의학연구원 2020 Integrative Medicine Research Vol.9 No.4

Background: The evidence of Acupuncture combined with speech rehabilitation training for post-stroke dysarthria is insufficient and there is no consensus on its efficacy. Methods: We searched seven Chinese and English medicine databases for randomized controlled trials (RCTs) from their inception to November 2019. The primary outcome measure was the clinical response rate, assessed with the Frenchay Dysarthria Assessment (FDA) tool. We assessed risk of bias using the Cochrane risk-of-bias tool. We used GRADE to assess the certainty of evidence (CoE). Results: Thirty studies were included in this systematic review, 23 of which were pooled in meta-analysis. Acupuncture combined with speech rehabilitation training is likely beneficial for was response rate (n = 1685; RR = 1.37; 95% CI [1.29, 1.46], P < 0.01, I2 = 34%; 17 studies, low CoE) compared to speech rehabilitation treatment alone. Conclusion: The combination of acupuncture and speech rehabilitation training may improve total response rate of stroke patients with dysarthria. However, more RCTs with rigorous study design and validated outcome measures are needed to confirm the evidence.

The Construction of the Trust Relationship between the Platform and the Consumer in Mutual Economic Environment

Qianwen Xu,Miaomiao Zheng,Weimiao Zheng,Xiaoying Hu,Dan Li,Cong Cao 한국경영정보학회 2021 한국경영정보학회 학술대회논문집 Vol.2021 No.11

The mutual aid economy mainly comes from the sharing economy. The “mutual aid economy” model of taking out personal idle funds to share with others to obtain the most significant economic benefits is an area that the international community is currently striving to explore. After the establishment of the "Mutual Insurance Commune", parallel to the development of the digital economy and the significant improvement of the material living standards, the mutual aid economy with unique advantages has been experiencing rapid growth in China. Because China has a large population and a large base of the bottom poor groups, the traditional insurance business can no longer meet the needs of these groups. In this context, the network mutual assistance platform bred by the combination of the Internet and the traditional insurance industry has ushered in a development boom. In recent years, however, the Internet mutual aid platform is under a contentious and intensified debate,which has a great relationship with the standard use of funds. Some network mutual aid platforms put forward that they have the right to manage the mutual aid funds stored on the platform, but there is no clear limit on the scope of use. In addition, the information disclosure of some platforms is not transparent enough, which makes the use of mutual aid funds standardized to become a major problem, which severely limits the development of network mutual aid platforms. A lot of news of “xx mutual assistance platform shutting down” has shaken the rationality and longevity of the network mutual aid platform. In addition, due to China's unique domestic political environment and policies, for example, in September this year, The State Council issued the notice of "normalization of collective procurement of medicines”, which will reduce the potential population of mutual insurance and have a certain impact on its development. These show that its stable development has hidden risks that it cannot ignore. Since the closure of Fun in Funding and Water Droplets Mutual Aid in March of this year, two leading mutual-aid platforms, the credibility of the mutual aid economy, the sustainability of online mutual-aid platforms, and the future of mutual aid are all doubtful and faint. Factors such as establishing the trust relationship between the platform and the consumer, the financing of the risk of entering and exiting the risk, the breadth, depth and timeliness of mutual assistance behaviour challenge the survival and development of network mutual assistance platforms. It also means that the transformation and upgrading of the traditional insurance industry in the Internet age is not smooth. However, on the other hand, online mutual aid platforms have the following advantages: First, mutual aid platforms have outstanding social benefits, which can maximize the benefits of social resources. Second, the fund scale of the network platform is relatively small, and the funding object is scattered. Third, the mutual aid platform's motivational orientation to pursue benefits makes its risks more controllable than other platforms. Also,the introduction of the "Blockchain" technology enhances the transparency and reliability of the mutual assistance mechanism. In the process of mutual-treasure operation, the integration of blockchain technology realizes the establishment of mutual-treasure advantages. This study believes that if we can correctly guide network mutual aid, it can become a new model in financial and insurance innovation. The study aims to provide constructive suggestions to promote the transformation and development of the network mutual aid platform and achieve high-quality development of the mutual aid economy in China. According to the development status of low threshold, high security, low intermediate cost and high self-propagation of mutual aid economy and network mutual aid platform at home and abroad, taking “Xianghubao”, a domestic “late start, fast development, “strong strength” network mutual assistance platform, as the research object. This study focuses on building a trust relationship between the network mutual aid platform and consumers in the mutual aid economy from the normative perspective of using technology and controlling mutual aid funds. Employing semi-structured interviews, questionnaires and data modelling and analysis, the study has explored the prerequisites for the rise and prosperity of the mutual aid economy include increasingly abundant idle resources, the establishment of collaborative network platforms, mutual aid value consensus, industry environment,then offers a deep analysis towards the mutual trust mechanism between the enterprise and the user within “Xianghubao”, to further probe into the logical and critical elements which impact on building the relationship of trust between the network mutual aid platform and consumers in mutual aid economy. Also, the "Blockchain" technology is introduced to enhance the transparency and reliability of the mutual assistance mechanism. Based on the study, the company can make corresponding countermeasures from the four dimensions of internal management, trusted products, risk control, and mutual trust between customers to deal with the reformation and the closure of “Xianghubao”. The research described in this paper was supported by a grant from the Zhejiang Province Undergraduate Innovation and Entrepreneurship Training Program (File No. S202110337116).

Numerical and experimental analysis of coupled transverse and longitudinal vibration of a marine propulsion shaft

Qianwen Huang,Xinping Yan,Yikun Wang,Cong Zhang,Yong Jin 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.12

An appropriate assessment of the dynamic behavior of marine propulsion shaft in ships is essential to enable optional delivery of power to the propeller and to minimize unnecessary vibration. Various vibrations coupling with each other can significantly influence the dynamical behavior of the shaft and threaten the reliability of ships. This paper presents a finite element analysis model with multiple constraint conditions to analyze the coupled transverse and longitudinal vibrations of a marine propulsion shaft. Based on this model, in addition to the coupled natural frequencies of each direction, the maximum acceleration are also determined. Furthermore, the simulation of an idling and loading vibration analysis is discussed and validated against experimental results, over a range of rotational speeds. The output of numerical simulation is found to agree with the corresponding results from experimental tests. Finally, an accurate and applicative FEA model for coupled transverse-longitudinal vibration of shaft has been obtained.