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Bo Zhao,Fan Chen,Xiao-feng Jia,Chong-yang Zhao,Xiao-bo Wang 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.4
Ultrasonic vibration-assisted Electrolytic in-process dressing (ELID) grinding is a highly efficient and highly precise machining method. The surface quality prediction model in ultrasonic vibration-assisted ELID mirror grinding was studied. First, the interaction between grits and workpiece surface was analyzed according to kinematic mechanics, and the surface roughness model was developed. The variations in surface roughness under different parameters was subsequently calculated and analyzed by MATLAB. Results indicate that compared with the ordinary ELID grinding, ultrasonic vibration-assisted ELID grinding is superior, because it has more stable and better surface quality and has an improved range of ductile machining.
Chemical Constituents from the Aerial Parts of Isodon coetsa and their Cytotoxicity
Wei Zhao,Jian Xin Pu,Xue Du,Yong Zhao,Fei He,Hai Bo Zhang,Yong Bo Xue,Wei Lie Xiao,Han Dong Sun,Ying Li Wu,Guo Qiang Chen 대한약학회 2011 Archives of Pharmacal Research Vol.34 No.12
Three new compounds (1-3), including a neolignan, a triterpenoid, and a diterpenoid, together with twenty known compounds (4-23), were isolated from the aerial parts of Isodon coetsa. Their structures and relative configurations were elucidated on the basis of spectroscopic data. Compounds 1, 3, 5-9, 11-13, 16-17, and 19-23 were evaluated for their cytotoxicity against HT-29, BEL-7402, and SK-OV-3 human tumor cell lines. Compound 7 showed significant inhibitory effects on all three types of cells, with IC50 values of 2.52, 3.06, 2.14 μM, respectively.
Comparison Study of the Band-gap Structure of a 1D-Photonic Crystal by Using TMM and FDTD Analyses
Jian-Bo Chen,Yan Shen,Wei-Xi Zhou,Yu-Xiang Zheng,Hai-Bin Zhao,Liang-Yao Chen 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.42
A variety of numerical methods has been developed to demonstrate the nature of photons propagating in an artificially-composed periodic structure. Differences will be generated by different kinds of numerical approaches. In this work, we carry out two types of numerical calculations, TMM (transfer matrix method) and FDTD (finite different time domain) calculations. In terms of the 1D-photonic crystal structures with two different structures, we illustrate the energy band spectra, and the results show dispersive characteristics for the optical transmission and reflection of the crystal material. Through a discussion of the mechanism, detailed comparison studies are preformed based on the different physical conditions. The results given in the work will help in better understanding the ways in which photons propagate in an artificially-composed periodic structure.
Identification of a Novel Human Zinc Finger Gene, ZNF438, with Transcription Inhibition Activity
( Zhao Min Zhong ),( Bo Wan ),( Yun Qiu ),( Jun Ni ),( Wen Wen Tang ),( Xin Ya Chen ),( Yun Yang ),( Su Qin Shen ),( Ying Wang ),( Mei Rong Bai ),( Qing Yu Lang ),( Long Yu ) 생화학분자생물학회 2007 BMB Reports Vol.40 No.4
Bo Song,Huaizhi Zhao,Linjiang Chai,Ning Guo,Hucheng Pan,Hongbing Chen,Renlong Xin 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.5
Extruded AZ31 Mg alloy rods were subject to free-end torsion deformation at room temperature. The microstructure features of the torsion deformed samples were characterized using electron backscatter diffraction technique. Mg rods with gradient microstructure can be fabricated by torsion deformation. Inhomogeneous distribution of microstructure along the radial direction of the twisted rods is attributed to the linearly increasing strain accumulation and strain rate from core to surface. With increasing equivalent strain, both the amount of {10- 12} twins and dislocation density increase and the c-axes of texture tend to rotate towards torsion axis. Although both dislocation slips and {10-12} twinning can be activated during torsion, dislocation slips are considered as the dominated deformation mechanism and responsible for the change of macro-texture for present torsion deformation. {10-12} twins and dislocations in the twisted samples can generate refinement hardening and dislocation hardening, respectively, to increase the hardness value.
Prognostic Value of CD44 Variant exon 6 Expression in Non-Small Cell Lung Cancer: a Meta-analysis
Zhao, Shuang,He, Jin-Lan,Qiu, Zhi-Xin,Chen, Nian-Yong,Luo, Zhuang,Chen, Bo-Jiang,Li, Wei-Min Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.16
Background: CD44v6 (CD44 variant exon 6) is the chief CD44 variant isoform regulating tumor invasion, progression, and metastasis. The prognostic value of CD44v6 expression in non small cell lung cancer (NSCLC) has been evaluated in many studies, but the results have remained controversial. Thus, we performed a meta-analysis of currently available studies to investigate the prognostic value of CD44v6 expression in NSCLC patients and the relationship between the expression of CD44v6 and clinicopathological features. Materials and Methods: Two independent reviewers searched the relevant literature in Pubmed, Medline and Embase from 1946 to January 2014. Overall survival (OS) and various clinicopathological features were collected from included studies. This meta-analysis was accomplished using STATA 12.0 and Revman 5.2 software. Pooled hazard ratios (HRs) with 95% confidence intervals (95%CIs) were calculated to estimate the effects. Results: A total of 921 NSCLC patients from ten studies met the inclusion criteria. The results showed that CD44v6 high expression was a prognostic factor for poor survival (HR=1.91, 95%CI=1.12-3.26, p<0.05). With respect to clinicopathological features, CD44v6 high expression was related to histopathologic type (squamous cell carcinoma versus adenocarcinoma: OR=2.72, 95%CI=1.38-5.38, p=0.004), and lymph node metastasis (OR=3.02, 95%CI=1.93-4.72, p<0.00001). Conclusions: Our results suggested CD44v6 high expression as a poor prognostic factor for NSCLC, and CD44v6 expression is associated with lymph node metastasis and histopathologic type. Therefore, CD44v6 expression can be used as a novel prognostic marker in NSCLC cases.
Bo, Tang,Bin, Chen,Zhibin, Zhao,Zheng, Xiao,Shuang, Wang The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.3
The resonant mechanism of reradiation interference (RRI) over 1.7MHz from power transmission lines cannot be obtained from IEEE standards, which are based on researches of field intensity. Hence, the resonance is ignored in National Standards of protecting distance between UHV power lines and radio stations in China, which would result in an excessive redundancy of protecting distance. Therefore, based on the generalized resonance theory, we proposed the idea of applying model-based parameter estimation (MBPE) to estimate the generalized resonance frequency of electrically large scattering objects. We also deduced equation expressions of the generalized resonance frequency and its quality factor Q in a lossy open electromagnetic system, i.e. an antenna-transmission line system in this paper. Taking the frequency band studied by IEEE and the frequency band over 1.7 MHz as object, we established three models of the RRI from transmission lines, namely the simplified line model, the tower line model considering cross arms and the line-surface mixed model. With the models, we calculated the scattering field of sampling points with equal intervals using method of moments, and then inferred expressions of Padé rational function. After calculating the zero-pole points of the Padé rational function, we eventually got the estimation of the RRI’s generalized resonant frequency. Our case studies indicate that the proposed estimation method is effective for predicting the generalized resonant frequency of RRI in medium frequency (MF, 0.3~3 MHz) band over 1.7 MHz, which expands the frequency band studied by IEEE.
An investigation on the bearing capacity of steel girder-concrete abutment joints
Chen Liang,Yuqing Liu,Changjun Zhao,Bo Lei,Jieliang Wu 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.38 No.3
To achieve a rational detail of the girder-abutment joints in composite integral bridges, and validate the performance of the joints with perfobond connectors, this paper proposes two innovative types of I-shaped steel girder-concrete abutment joints with perfobond connectors intended for the most of bearing capacity and the convenience of concrete pouring. The major difference between the two joints is the presence of the top flange inside the abutments. Two scaled models were investigated with tests and finite element method, and the damage mechanism was revealed. Results show that the joints meet design requirements no matter the top flange exists or not. Compared to the joint without top flange, the initial stiffness of the one with top flange is higher by 7%, and the strength is higher by 50%. The moment decreases linearly in both types of the joints. At design loads, perfobond connectors take about 70% and 50% of the external moment with and without top flange respectively, while at ultimate loads, perfobond connectors take 53% and 26% of the external moment respectively. The ultimate strengths of the reduced sections are suggested to be taken as the bending strengths of the joints.
Investigation of Porous Structure of Aerogel Prepared from Nanofibrillated Cellulose
Chen Gong,Yu Shi,Jian-Ping Ni,Xiao-Bo Yang,Yan-Zhao Liu,Chao Tian 한국펄프·종이공학회 2016 펄프.종이기술 Vol.48 No.6
Cellulose aerogels were prepared through changing the concentration of TEMPO-oxidized cellulose suspension and applying high-pressure homogenization, followed by regular or rapid freeze drying methods. The prepared cellulose aerogel was studied by scanning electron microscopy, BET analysis (nitrogen gas adsorption), and mercury intrusion porosimetry to investigate the effect of variables on the porous properties. In the present study, the porous structure of cellulose aerogel was well obtained by varying concentration of NFC and applying rapid freeze drying approach. The specific surface area of prepared cellulose aerogels varied linearly with adjusting concentrations of NFC, and the highest surface area of cellulose aerogel was attained at 2.0% concentration of NFC in this study. Compared to regular freezing in the freezer, rapid freezing in the liquid nitrogen prepared cellulose aerogel has a lower BET value but more uniform structure with relatively narrow pore size distribution.
Mass transfer and kinetics study on the sulfite forced oxidation with manganese ion catalyst
Zhao Bo,Li Yan,Zhuo Yuqun,Tong Huiling,Zhang Xiaowen,Chen Changhe 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.3
limestone scrubbing is the most common flue gas desulfurization process (FGD) for control of sulfurdioxide emissions from the combustion of fossil fuels. Forced oxidation, which controls the overall reaction of the sulfurdioxide absorption, is the key path of the process. Manganese which comes from the coal is one of the catalysts duringthe forced oxidation process. In the present work, the two-film theory was used to analyze the sulfite forced oxidationreaction with an image boundary recognition technique, and the oxidation rate was experimentally studied by contactingpure oxygen with a sodium sulfite solution. There was a critical sulfite concentration 0.328 mol/Lwithout catalyst ortion constant k; furthermore, we obtained the order with respect to the sulfite and Mn2+ concentrations. When the Mn2+catalyst concentration was kept unchanged, the sulfite oxidation reaction rate was controlled by dual film and the reac-tion kinetics was first order with respect to sulfite while concentration was below 0.328 mol/L; the sulfite oxidationreaction rate was controlled by gas film only and the reaction kinetics was zero order with respect to sulfite while concentration over 0.328 mol/L. When concentration was kept unchanged, the sulfite oxidation reaction rate de-pended on gas-liquid mass transfer and the reaction kinetics was diferent in various stages with respect to Mn2+ con-centrations.