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Studying of Pre-Forming Method Applying on Refrigerator
Jian-Guang Zhai,Jong-Rae Cho,Jung-Il Song 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.4
In this studying, we developed a named Pre-Forming method in order to decrease thermal bowing deformation of refrigerator. Finite element method (FEM) was applied to calculate thermal deformation of the specified refrigerator model. The sequential thermal-mechanical coupling analysis method was used in ANSYS V12.0. The finite element (FE) model of convex, concave and convex-concave pattern were analyzed comparing to the refrigerator model without any special structure on the side wall of inner case. After calculating, temperature distribution conditions are almost the same as each other of pre-forming models. The pre-forming models obviously decrease thermal deformation by means of creating pre-deformation which would make inner case keep ideal shape that we anticipate.
Guang-Jian Wang,Jian-Kang Zhang,Ying Liu 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.8
Catalytic oxidative desulfurization (Cat-ODS) of benzothiophene (BT) in n-octane has been investigated with hydrogen peroxide (H2O2) over catalysts of activated carbon (AC) supported iron oxide under mild conditions. The catalyst was characterized by N2 adsorption, XRD, SEM/EDS, TPR and XPS. Under the best operating condition for the catalytic oxidative desulfurization--temperature 60 oC, atmospheric pressure, 0.15 g Fe/AC, 18 molar ratio of hydrogen peroxide to sulfur, using acetonitrile as extraction solvent for double extraction--the sulfur content in model diesel fuel (MDF) was reduced from 700 ppmw to 30 ppmw with 95.66% of total sulfur was removed.
Macrophage-secreted Exosomes Delivering miRNA-21 Inhibitor can Regulate BGC-823 Cell Proliferation
Wang, Jian-Jun,Wang, Ze-You,Chen, Rui,Xiong, Jing,Yao, Yong-Liang,Wu, Jian-Hong,Li, Guang-Xin Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.10
Exosomes, membranous nanovesicles, naturally carry bio-macromolecules or miRNA and play impoetant roles in tumor pathogenesis. Here, we showed that macrophages cell-derived exosomes can function as vehicles to deliver exogenous miR-21 inhibitor into BGC-823 gastric cancer cells. Exosomes loaded with miR-21inhibitor significantly increased miR-21 levels in BGC-823, but miR-21inhibitor loaded in exosomes exerted an opposite effect. miRNA transfected with exosomes had less cellular toxicity to host cells compared to conventional transfection methods. The miR-21inhibitor loaded exosomes promoted the migration ability and reduced apoptosis of BGC-823 gastric cancer cells. These observations indicate that miR-21 acts as a tumor promoter by targeting the PDCD4 gene and preventing apoptosis of gastric cancer cells through inhibition of PDCD4 expression. Furthermore, exosome -mediated miR-21 inhibitor delivery resulted in functionally more efficient inhibition and less cellular toxicity compared to conventional transfection methods. Similar approaches could be useful in modification of target biomolecules in vitro and in vivo. These findings contribute to our understanding of the functions of miR-21 and exosomes as a carrier for therapy of gastric cancer.
A simulant study of the Network of Five Elements by using the computer
Yang, jian hua,Zhang, zhi guang,Zhang, guang nian,Lin, Shu huang 한국정신과학학회 1997 한국정신과학회 학술대회 논문집 Vol.7 No.-
The theory of Chinese medicine is a based theory to research the paranomarl function of human body including ESP and PK etc. The theory of the traditional Chinese medicine indictes that the life prosesses can be discribed by the system of five elements (SFE), which are: wood, fire, earth, metal and water. We take the SFE for a network consisted of this five elements (NFE), and study the characteries of the structure of this NFE. they include multi-cross character; directiong and irreversible character; mesomerism character; "open" character and Fuzzy character etc. Then, based on these characters, we simulate the partial function of NFE by using computer. The results of simulation show that the NFE is a very useful network to explain the physiological and pathological phenomenan of human body according to the theory of traditional Chinese medicine.
Borehole stability analysis in oil and gas drilling in undrained condition
Wei, Jian-Guang,Yan, Chuan-Liang Techno-Press 2014 Geomechanics & engineering Vol.7 No.5
Borehole instability during drilling process occurs frequently when drilling through shale formation. When a borehole is drilled in shale formation, the low permeability leads to an undrained loading condition. The pore pressure in the compressed area near the borehole may be higher than the initial pore pressure. However, the excess pore pressure caused by stress concentration was not considered in traditional borehole stability models. In this study, the calculation model of excess pore pressure induced by drilling was obtained with the introduction of Henkel's excess pore pressure theory. Combined with Mohr-Coulumb strength criterion, the calculation model of collapse pressure of shale in undrained condition is obtained. Furthermore, the variation of excess pore pressure and effective stress on the borehole wall is analyzed, and the influence of Skempton's pore pressure parameter on collapse pressure is also analyzed. The excess pore pressure decreases with the increasing of drilling fluid density; the excess pore pressure and collapse pressure both increase with the increasing of Skempton's pore pressure parameter. The study results provide a reference for determining drilling fluid density when drilling in shale formation.
Rapid Parallel Calculation of shell Element Based On GPU
Jian HuaWanga,Guang YaoLia,Sheng Lib,yongzhangc 한국소성가공학회 2010 기타자료 Vol.2010 No.6
Long computing time bottlenecked the application of finite element. In this paper, an effective method to speed up the FEM calculation by using the existing modern graphic processing unit and programmable colored rendering tool was put forward, which devised the representation of unit information in accordance with the features of GPU, converted all the unit calculation into film rendering process ,solved the simulation work of all the unit calculation of the internal force , and overcame the shortcomings of lowly parallel level appeared ever before when it run in a single computer . Studies shown that this method could improve efficiency and shorten calculating hours greatly. The results of emulation calculation about the elasticity problem of large number cells in the sheet metal proved that using the GPU parallel simulation calculation was faster than using the CPU’s. It is useful and efficient to solve the project problems in this way.
SYNTHESIS OF YTTRIA-STABILIZED CUBIC ZIRCONIA NANOCRYSTALS BY ULTRASONIC–MICROWAVE ROUTE
JIAN-DONG WANG,CHONG-XIAO LUO,YI LU,GUANG-MING LI,JIN-KU LIU 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2010 NANO Vol.5 No.5
The yttria-stabilized zirconia (YSZ) nanocrystals with uniform size, high purity, and high degree of crystallinity, were prepared by ultrasonic–microwave-assisted method. The structure, optical properties and morphologies of YSZ nanocrystals were characterized by X-ray powder diffraction (XRD), Raman spectroscopy, UV–vis absorption, scanning electron microscope (SEM) and transmission electron microscopy (TEM). The SEM and TEM images of the YSZ nanocrystals indicate that the product is a mono-dispersion structure with an average particle size of about 25 nm.
OPE molecular junction as a hydrogen gas sensor
Jian-Guo Xin,Chuan-Lu Yang,Mei-Shan Wang,Xiao-Guang Ma 한국물리학회 2018 Current Applied Physics Vol.18 No.3
Oligo(phenylene ethynylene) (OPE) molecular junction has been suggested as a H2 molecule sensor based on calculations using the first principles of density–functional theory and non-equilibrium Green's function. The electronic transport properties of the OPE molecule between two Au electrodes with or without adsorbed H2 molecules are investigated. Results show that the adsorbed H2 molecule significantly changes the characteristics of the current–voltage curve of the OPE molecular junction. The pure OPE molecular junction exhibits a significant negative differential resistance, but this kind of phenomenon will disappear or weaken after hydrogen molecules are adsorbed. The conductance of the junction also obviously decreases in the bias range of [−0.4, 0.4] V after adsorbing H2 molecules. These effects can be used to design a H2 molecule sensor.