Transverse Tensile Deformation and Failure of Three-dimensional Five-directional Braided Carbon Fiber Composites

Wei Zhou,Zhi-yuan Wei,Guang-fei Wang,Kang-ning Han,Ran Liu,Lian-Hua Ma 한국섬유공학회 2021 Fibers and polymers Vol.22 No.4

Accurate characterisation of transverse tensile deformation and damage evolution is of importance for evaluatingthe failure behaviors of three-dimensional (3D) braided composites. In the present study, a finite element method (FEM) andseveral non-destructive testing methods including acoustic emission, digital image correlation, and infrared thermography aredeveloped to investigate the transverse tensile deformation and damage evolution of 3D five-directional braided composites. In the finite element approach, a matrix-impregnated fiber bundles (MIFB) model and a representative volume cell (RVC)model, which take into account the fiber bundles and matrix, are respectively established to predict the effective mechanicalproperties of fiber bundles and simulate the deformation and progressive damage of such composites. The damaged locationsand the failure modes including matrix crack, fiber debonding and shear fracture of fiber are predicted and verified byexperimental tests. The non-destructive tests show that the transverse tensile fracture process can be divided into four stageswhich correspond to acoustic emission signals severally. The combination of the FEM based numerical modeling andmultiple non-destructive characterisation methods can accurately monitor the deformation and damage behaviors of 3Dbraided composites under transverse tensile loads and thus provide a reference for structural health monitoring of compositesin practical application.

Phytochemical Studies of Korean Endangered Plants: A New Flavone from Rhododendron brachycarpum G.Don

Wei Zhou,오준석,이위,김동우,이승호,나민균 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.8

Significance of “Deqi” Response in Acupuncture Treatment: Myth or Reality

wei zhou,peyman benharash 사단법인약침학회 2014 Journal of Acupuncture & Meridian Studies Vol.7 No.4

Acupuncture has been practiced in China for over 2000 years to treat a variety of diseases based on the “meridian theory,” as described in the “Yellow Emperor’s Classics of Inter- nal Medicine.” Deqi refers to the excitation of qi or vital energy inside meridians by acupuncture needle stimulation. Patients often experience multidimensional and intense needling sensations such as numbness, soreness, distention, heaviness, dull pain, and sharp pain during acupuncture stimulation. Deqi is considered as an important parameter in the process of achieving therapeutic effectiveness in acupuncture treatment. Under- standing this phenomenon from neurophysiological aspects is important for clinical prac- tice and enables practitioners to perform quantitative acupuncture evaluation to obtain a reliable prognosis of acupuncture treatment. This review paper describes our current knowledge and understanding of Deqi from a physiological aspect.

An Interference Isolation Method for Wireless Power and Signal Parallel Transmissions on CPT Systems

Wei Zhou,Yu-Gang Su,Shi-Yun Xie,Long Chen,Xin Dai,Yu-Ming Zhao 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.1

A novel interference isolation method is proposed by using several designed coils in capacitive power transfer systems as isolation impedances. For each designed coil, its stray parameters such as the inter-turn capacitance, coil resistance and capacitance between the coil and the core, etc. are taken into account. An equivalent circuit model of the designed coil is established. According to this equivalent circuit, the impedance characteristic of the coil is calculated. In addition, the maximum impedance point and the corresponding excitation frequency of the coil are obtained. Based on this analysis, six designed coils are adopted to isolate the interference from power delivery. The proposed method is verified through experiments with a power carrier frequency of 1MHz and a data carrier frequency of 8.7MHz. The power and data are transferred parrallelly with a data carrier attenuation lower than -5dB and a power attenuation on the sensing resistor higher than -45dB.

Enhanced Separation Capability of Rhodium Ionic Catalyst Encapsulated by Propionation-Terminated Poly(propylene imine) Dendrimer

Wei Zhou,Xiaohong Peng 한국고분자학회 2019 Macromolecular Research Vol.27 No.3

The second generation of poly(propylene imine) dendrimer peripherally terminated by propionation (G2-P) was synthesized. The structure and composition of G2-P were characterized by Fourier transform infrared (FTIR) spectrometer, 1H nuclear magnetic resonance spectroscopy (NMR), 13C NMR, matrix assisted laser desorption ionization time of flight mass spectrometry (MALDI-TOF MS) and elemental analysis. The encapsulated catalyst (G2-P(Rh3+)) was prepared by the coordination between G2-P and RhCl3·3H2O, and applied to the hydrogenation of nitrile-butadiene rubber (NBR) and styrene-butadiene rubber (SBR). G2-P(Rh3+) displayed excellent catalytic activity and selectivity for NBR and SBR hydrogenation, and Rh residue contents for hydrogenated NBR (HNBR) and hydrogenated SBR were only 80 ppm and 35 ppm respectively without any post treatment, which decreased 69.8% and 80.9% respectively compared with those of RhCl(PPh3)3.

Whether can Posner-Schlossman syndrome be treated through a physiotherapy, ciliary muscle training method?

Wei Zhou,Xiaoyan Zhang 셀메드 세포교정의약학회 2015 셀메드 (CellMed) Vol.5 No.4

A new physiotherapy named Ciliary Muscle Training method and one successful case had been reported first for treatment of Posner-Schlossman Syndrome (PSS), also known as Glaucomatocyclitic Crisis. When a person observed a back and forth moving object, the ciliary muscle would involuntarily do sometimes tense and sometimes relaxant exercise which can relieve the tensive state of the ciliary muscle of patients suffering PSS disease. Through this period of continued treatment, this ciliary muscle training method can improve the health status of the ciliary muscle and finally achieve the purpose of curing PSS disease. In this successful case, the patient’s feedback result was very good after receiving our suggested ciliary muscle training method as an attempt to treat PSS, ill right eye of this PSS patient showed normal appearance without any differences from the other normal eye, his vision test values of naked eye were both 4.9 under nearly 200 degrees of myopia. High intraocular pressure (IOP) was mitigated, measured IOP value was in the normal (≦ 21 mmHg) and comfortable state without PSS relapse until now. Therefore, ciliary muscle training method could be a potential clinical treatment approach to PSS disease.

LAMP, PCR, and real-time PCR detection of Acetobacter aceti in yogurt

Wei Zhou,Yan Zhang,Shuang Wang,Yuehua Li,Jingjing Zhang,Cuixia Zhang,Zan Wang,Zhisheng Zhang 한국식품과학회 2017 Food Science and Biotechnology Vol.26 No.1

Acetic acid bacteria (AAB) can spoil food. Acetobacter aceti as a core subgroup of AAB is usually isolated from yogurt. A. aceti should be timely and effectively detected to prevent yogurt contamination. The present study focused on A. aceti to establish an assay that can be performed to detect AAB in yogurt. LAMP, PCR, and real-time PCR were applied and compared for detecting A. aceti from pure culture and artificially contaminated yogurt samples. In pure culture, LAMP showed the highest detection sensitivity with 10−1 CFU/mL. For yogurt samples, the sensitivity limit of LAMP was 102 CFU/mL, which was lower than that of real-time PCR (101 CFU/mL). The results indicated that these methods could be quickly and efficiently applied to detect A. aceti. As LAMP technology has low cost and high detection efficiency, it can potentially be applied for detecting A. aceti in production and quality control programs of yogurt.

Preparation and Catalytic Application of Rh3+/Ru3+ Bimetallic Catalyst Stabilized by Triolefinic Macrocycle-Terminated Poly(propylene imine) Dendrimer

Wei Zhou,Xiaohong Peng 한국고분자학회 2016 Macromolecular Research Vol.24 No.11

The novel homogeneous bimetallic Rh3+/Ru3+ catalyst (G2-M(Rh3+ xRu3+ 10-x)) was prepared within a second- generation poly(propylene imine) dendrimer terminated by nitrogen-containing triolefinic macrocycle (G2-M) by a co-complexation route. The G2-M(Rh3+ x Ru3+ 10-x) catalyst was analyzed by 1H NMR (nuclear magnetic resonance), XPS (X-ray photoelectron spectroscopy), and XRD (X-ray diffraction). As a novel catalyst system, The bimetallic ions of Rh3+ and Ru3+ influenced on the catalytic activity for the hydrogenation of nitrile-butadiene rubber (NBR), which can be related to electron-deficiency effect resulting from the electron density shift from the Rh3+ to the Ru3+. The G2-M (Rh3+ 10) and G2-M(Rh3+ 7Ru3+ 3) displayed more excellent activity and favorable separation capability for the hydrogenation of NBR than the Rh nanoparticle catalyst stabilized by G2-M (G2-M(Rh10)).

EMP3 Overexpression in Primary Breast Carcinomas is not Associated with Epigenetic Aberrations

Wei Zhou,Jinming Yu,Zheng Jiang,Xingang Li,Fenghua Xu,Yanbing Liu,Peie Wen,Li Kong,Ming Hou,Jinming Yu 대한의학회 2009 Journal of Korean medical science Vol.24 No.1

Epithelial membrane protein 3 (EMP3) is a trans-membrane signaling molecule with important roles in the regulation of apoptosis, differentiation and invasion of cancer cells, but the detailed is largely still unknown. We analyzed the mRNA levels and methylation statuses of EMP3 in 63 primary breast carcinomas and assessed their correlations with clinicopathologic variables. The expression of EMP3 mRNA in primary breast carcinomas was significantly higher than the expression of 20 normal breast tissues (p<10-7). EMP3 overexpression in breast carcinomas was significantly related to histological grade III (p=3.9×10-7), lymph node metastasis (p= 0.003), and strong Her-2 expression (p=3.3×10-6). Hypermethylation frequencies of EMP3 were detected in 36.5% of breast carcinomas by methylation-specific polymerase chain reaction. However, no significant correlations were found between methylation status of EMP3 and mRNA expression levels as well as other clinical parameters. In conclusion, EMP3 may be a novel marker of tumor aggressiveness. Overexpression of EMP3 in primary breast carcinoma is not associated with DNA methylation.

Language Attitude of Ethnic Chinese in Four Southeast Asian Countries

Wei Zhou,Jun-Eon Park 한국외국어교육학회 2017 Foreign languages education Vol.24 No.3

Today, tens of millions of ethnic Chinese are scattered throughout Southeast Asia as a result of the massive influx of immigrants from China during the past several centuries. The present study analyzed the language attitude of the ethnic Chinese in Southeast Asia, focusing on four countries: Indonesia, Thailand, Malaysia, and Singapore. For this purpose, a total of 177 samples of language attitude questionnaire were collated. The questionnaire was composed of 11 language attitude-related elements in affective, behavioral, and cognitive components with respect to the multiple languages used in the countries: national language, English, local Chinese dialects, Mandarin, and others. Analysis of the data reveals intriguing findings about the language attitude of the ethnic Chinese in different countries. Both the similarities and the differences of language attitude are found among the ethnic Chinese groups in the Southeast Asian countries, reflecting the political, economic, and social situations of each country. The prospect of the local Chinese dialects look dim due to exogenous factors surrounding the linguistic ecosystems in the region.