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Chen, Ying,Ye, Yanfang,Zhang, Zhen,Zhang, Chi,Chen, Minyu,Pang, Jun,Zhou, Shuxian,Xiang, Qiuling The Korean Nutrition Society 2019 Nutrition Research and Practice Vol.13 No.5
BACKGROUND/OBJECTIVES: The association between tea consumption and risk of coronary heart disease (CHD) remains controversial. This study aimed to determine whether tea consumption has an effect on CHD risk in Chinese adults. SUBJECTS/METHODS: In this hospital-based case-control study, 267 cases of CHD and 235 non-CHD controls were enrolled. Blood samples from all cases were examined. Cardiac function indices (left ventricular ejection fraction, left ventricular end-diastolic dimension, lactate dehydrogenase, and creatine kinase of the muscle or brain type), blood lipid index (high-density lipoprotein cholesterol), and blood coagulation function indices (fibrinogen and activated partial thromboplastin time) were recorded. Tea consumption of study participants was assessed by a specifically designed questionnaire. The baseline characteristics of the study populations were recorded, and CHD-related biomarkers were detected. Differences in baseline characteristics of the study participants were examined using t-tests for continuous variables and chi-squared tests for categorical variables. Unconditional logistic regression was used to measure the association between tea and CHD. RESULTS: There were significant differences in cardiac function indices, blood lipid index, and blood coagulation indices between CHD cases and controls (P < 0.05). We found tea consumption reduced CHD risk in female participants (adjusted odds ratio (OR) = 0.484, 95% CI: 0.242-0.968, P = 0.0403). Regarding the type of tea consumed, the risk of CHD was reduced in women who drank partially fermented tea (adjusted OR = 0.210, 95% CI: 0.084-0.522, P = 0.0008). Analytic results for the amount of tea consumed per unit time showed CHD risk was reduced in women who consumed 1-2 cups of tea per day (adjusted OR = 0.291, 95% CI: 0.131-0.643, P = 0.0023). A tea-drinking frequency of > 6 days/week was beneficial for CHD prevention (adjusted OR = 0.183, 95% CI: 0.049-0.679, P = 0.0112). When analyzed according to the duration of tea consumption, the risk of CHD was reduced in participants who had been drinking tea for 10-20 years (adjusted OR = 0.360, 95% CI: 0.137-0.946, P = 0.0382). CONCLUSIONS: Tea consumption is associated with a reduced risk of CHD in female but not male populations in Guangzhou.
Zhen-Chen Tang,Ding-Hua Yu,Peng Sun,Heng Li,He Huang 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.12
Niobium oxide (Nb2O5) and phosphated Nb2O5 were synthesized and used as catalysts for sorbitol dehydration to isosorbide. The characterization results of N2 adsorption, XRD and NH3-TPD revealed that the phosphoric acid modification could well prevent the crystallization of Nb2O5. And the amorphous phosphated Nb2O5 catalysts kept the relatively large surface area and stable acidity at high calcination temperature. The catalytic results showed that the selectivity to isosorbide could be dramatically enhanced over phosphated Nb2O5. The excellent catalytic performance with 100.0% sorbitol conversion and 62.5% isosorbide selectivity were obtained over the .8P/NBO-400 catalyst. Comparing with Nb2O5 catalysts, phosphated Nb2O5 catalysts regenerated through a simple calcination process showed no significant activity loss after recycling three runs.
Chen Zhen,Xing Xiaoxue,Guo Pan,Fan Qinyin 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.8
After the image decomposition with Non-subsampled Shearlet Transform (NSST), the transform coefficients have a larger redundancy. In order to reduce the redundant information, an image fusion algorithm based on NSST and non-negative matrix factorization (NMF) is introduced. The source images are decomposed with NSST into the low-frequency coefficients and the high-frequency sub-band coefficients. The low-frequency coefficients are fused based on NMF theory. The high-frequency coefficients are fused based on Regional Sum Modified-Laplacian (SML) Maximum. Finally, the inverse NSST is used to reconstruct the final fused image. The proposed algorithm can effectively remove redundant information, extract global features and capture more direction details information of multi-source image. Experiments show that the proposed algorithm has obvious advantages and the fused image quality has been greatly improved. The presented algorithm is superior to other fusion algorithms from the objective parameters.
Zhen-Hua Chen,Liang-Peng Sun,Wei Zhang,Qiang Shen,Li-Xin Gao,Jia Li,Hu-Ri Piao 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.5
Protein tyrosine phosphatase 1B (PTP1B) is a key factor in negative regulation of the insulin pathway, and is a promising target for the treatment of type-II diabetes, obesity and cancer. Herein, compound (4) was first observed to have moderate inhibitory activity against PTP1B with an IC50 value of 13.72 ± 1.53 μM. To obtain more potent PTP1B inhibitors, we synthesized a series of chalcone derivatives using compound (4) as the lead compound. Compound 4l (IC50 = 3.12 ± 0.18 μM) was 4.4-fold more potent than the lead compound 4 (IC50 = 13.72 ± 1.53 μM), and more potent than the positive control, ursolic acid (IC50 = 3.40 ± 0.21 μM). These results may help to provide suitable drug-like lead compounds for the design of inhibitors of PTP1B as well as other PTPs.
Dirichlet heat kernel estimates for rotationally symmetric Lévy processes
Chen, Zhen-Qing,Kim, Panki,Song, Renming Oxford University Press 2014 Proceedings of the London Mathematical Society Vol.109 No.1
<P>In this paper, we consider a large class of purely discontinuous rotationally symmetric Lévy processes. We establish sharp two-sided estimates for the transition densities of such processes killed upon leaving an open set [Formula]. When [Formula] is a [Formula]-fat open set, the sharp two-sided estimates are given in terms of surviving probabilities and the global transition density of the Lévy process. When [Formula] is a [Formula] open set and the Lévy exponent of the process is given by [Formula] with [Formula] being a complete Bernstein function satisfying a mild growth condition at infinity, our two-sided estimates are explicit in terms of [Formula], the distance function to the boundary of [Formula] and the Lévy density of [Formula]. This gives an affirmative answer to the conjecture posted in Chen, Kim and Song [Global heat kernel estimates for relativistic stable processes in half-space-like open sets. <I>Potential Anal.</I> 36 (2012) 235–261]. Our results are the first sharp two-sided Dirichlet heat kernel estimates for a large class of symmetric Lévy processes with general Lévy exponents. We also derive an explicit lower bound estimate for symmetric Lévy processes on [Formula] in terms of their Lévy exponents.</P>
Zhen Troy Chen,La-Mei Chen 이화여자대학교 한국여성연구원 2021 Asian Journal of Women's Studies(AJWS) Vol.27 No.2
This paper investigates the mediated narratives and identity construction of a reading club of female workers in call centers of multinational corporations in Dalian China, where the discourse of an empowering ‘female force’ has been popularized and scrutinized on Chinese social media. These professional workers manage and construct their emerging middle-class identities through embodied experiences and mediated discourses fostered by an English reading club that is both online and offline. Responding to recent critiques of neoliberal feminism in the Chinese context, this study uses a mixed-method approach to unpack the complex processes of these women’s identity construction and performance through participatory reading practices. This includes ethnographic participant observation in offline reading club activities, in-depth interviews, and a discourse analysis of mediated narratives on social media (WeChat). We argue that Chinese working women’s identity construction and performance are shaped by complex intersections of class, nation, gender and workplace/institutions, where their encounters are in flux, given the changing neoliberal globalization process after China’s four-decade long opening up reform. This study challenges and extends the critique of neoliberal feminism and finds evidence of agency and tactical engagement whereby female workers negotiate their emerging middle-class identities and forge possible solidarities within a networked workplace. 本文着眼“女子力”话语调查分析了大连软件园某全球呼叫中心英文读书会中 女性的媒介化话语和身份认同构建过程。本文对身份认同理论进行创新尝 试,提出“社会性过渡自我”,阐释职业女性身份认同构建和展演过程的多重 制约因素,挑战并发展了对新自由主义女性主义的批判。本文指出在研究中 国女性权利实践时不能陷入历史的虚无,她们运用科技、职场、公共领域等 资源,策略性运用资本制造的潮流话语构建“网络化职场”,达成互助团结。