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Development of lattice inversion modified embedded atom method and its applications
Xianbao Duan,Bing Zhou,Rong Chen,Huamin Zhou,YanweiWen,Bin Shan 한국물리학회 2014 Current Applied Physics Vol.14 No.12
The modified embedded atom method (MEAM) has been widely used in describing the physical properties of elemental crystals, alloys and compounds with multiple lattice structures. We report here the development of a reliable procedure to reduce the complexity of the MEAM formalism by removing the many-body screening function. In the proposed formulation, the interatomic pair potential is obtained by applying Chen-M€obius lattice inversion up to fifth nearest neighbors, so that the cohesive energy curve can be reproduced faithfully. The newly developed model (Lattice Inversion MEAM, LI-MEAM), which can be viewed as a direct extension of the embedded atom method (EAM), no longer requires the computation of many-body screen functions and has fewer adjustable parameters than MEAM. As an illustration, we optimized the potential parameters of body centered cubic iron (bcc-Fe). The values of the calculated physical properties agree well with experimental results. We further investigated the sizedependent melting behavior of bcc-Fe nanoparticles (NPs) with particle size ranging from 725-atom (~25 Å) to 22899-atom (~80 Å) using replica exchange molecular dynamics (REMD) simulations. Our simulations show advantages of LI-MEAM in modeling of the melting process and quantitatively reveals that the liquid skin melting (LSM) process of bcc-Fe NPs.
Kinetics of Nitrogen Absorption in Molten AISI 316 Stainless Steel During Immersion Nitrogen Blowing
Chen Jian-Bin,Chen Qi-Zhong,Chen Zhao-Ping,Jiang Zhou-Hua,Huang Zong-Ze,Pan Jia-Qi 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.1
Nitrogen absorption in molten metal for stainless steel AISI316 has been investigated by immersion nitrogen blowing through an immersed alumina nozzle with an internal diameter of 3 mm. Based on these experimental data, some kinetic parameters of nitrogen absorption, such as reaction order, rate constant and apparent activation energy of nitrogen absorption reaction, have been obtained. Effect of stirring by immersion nitrogen blowing through an immersed alumina nozzle on nitrogen absorption reaction has been observed. Results show the following: (1) Nitrogen absorption reaction is the −1.5th order reaction. The rate constant N is of the order of 10−5wt%2.5·min −1. Nitrogen absorption reaction for AISI 316 has negative apparent activation energy of −92.40 kJ·mol −1. This indicates that the nitrogen absorption reaction has a complex and multistep reaction mechanism. (2) The rate of nitrogen absorption reaction in molten stainless steel is mixture control by the adsorption of monatomic nitrogen on the surface of molten stainless steel and mass transfer in molten metal. (3) A rate equation of nitrogen absorption reaction has been derived based on a mixed control mechanism by both the -1st order nitrogen absorption reaction and mass transfer in molten metal.
Bin Yang,Dan Wang,Qin-Ting Chen,Jin Chen,Kang Chen,Ji-Bin Miao,Jia-Sheng Qian,Ru Xia,You Shi 한국고분자학회 2020 폴리머 Vol.44 No.3
In this study, we prepared series of recycled polyethylene terephthalate (RPET)/polyethylene (PE) blends using melt extrusion. The effect of RPET content on crystallization behavior and thermal conductive properties of the resultant blends were investigated using differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA), etc. RPET was found to exert nucleating effect on the melt crystallization of PE. The Agari model presented fairly reasonable prediction of thermal conductivity as a function of RPET loading. The melt cooling process was predicted with an enthalpy transformation method (ETM), which is a well-established mean of evaluating the instantaneous heat conduction of crystalline polymers/composites, and the obtained curves were consistent with our experimental results. Besides, a four-parameter model (FPM) was adopted coupled with an in-situ temperature measurement in order to further disclose the solidification and crystallization kinetics of PE in the presence of RPET in the blends.
陈彬彬 ( Chen¸ Bin Bin ),董健菲 ( Dong¸ Jianfei ),韩东洙 ( Han¸ Dong Soo ) 한국중국학회 2021 중국학보 Vol.97 No.-
在中国古代城市史的研究中, 关于古代都城的研究多集中在传统城市文化内核区, 而边缘地区的都城相关研究尚待完善。本次研究是在汉魏时期黑龙江地域的民族和文化背景下, 通过溯源凤林古城的历史信息, 解读都城的内部关系, 总体布局, 并与文化核心区的都城进行比较分析, 从而阐释凤林古城的都城空间特点, 丰富在建筑考古视角下对黑龙江地域古代都城方面的研究, 同时也有助于对东北地区都城历史发展脉络的建构。 In the study of ancient Chinese urban history, the study of ancient capitals mainly focuses on the core area of traditional urban culture, while the study of capitals in marginal areas remains to be improved. Under the national and cultural background of Heilongjiang region in the Han and Wei dynasties, this study traces the historical information of Fenglin ancient city, interprets the interal relationship and overall layout of the capital, and makes a comparative study with the capital in the culture core area, so as to enrich the research on the ancient capital of Heilongjiang region from the perspective of Architecturak Archaeology, and also helps to understand the historical development of the capital in Northeast China The construction of collaterals.
Inactivated Sendai Virus Strain Tianjin Induces Apoptosis in Human Breast Cancer MDA-MB-231 Cells
Chen, Jun,Han, Han,Chen, Min,Xu, Xiao-Zhu,Wang, Bin,Shi, Li-Ying Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.12
Sendai virus strain Tianjin is a novel genotype. Here, we investigate the antitumor and proapoptotic effects of ultraviolet-inactivated Sendai virus strain Tianjin (UV-Tianjin) on human breast cancer MDA-MB-231 cells in vitro, as well as the involvement of the apoptotic pathway in the mechanism of UV-Tianjin-induced antitumor effects. MTT assays showed that treatment with UV-Tianjin dose-dependently inhibited the proliferation of MDA-MB-231 cells but not normal MCF 10A breast epithelium cells. Hoechst staining and flow cytometric analysis revealed that UV-Tianjin induced apoptosis of MDA-MB-231 cells in a dose-dependent manner. Moreover, UV-Tianjin treatment resulted in reduction in the mitochondria membrane potential (MMP) and release of cytochrome complex (cyt c) via regulation of Bax and Bcl-2, as well as activation of caspase-9, caspase-3, Fas, FasL and caspase-8 in MDA-MB-231 cells. In summary, our study suggests that UV-Tianjin exhibits anticancer activity in human breast cancer MDA-MB-231 cells through inducing apoptosis, which may involve both the endogenous mitochondrial and exogenous death receptor pathways.
( Bin Yin ),( Chen Xi Hu ),( Zheng Chen ),( Wen Jun Zhao ),( Li Rong Wei ),( Yan Wen Zheng ),( Chao He ),( Yan Zeng ) 한국응용약물학회 2014 Biomolecules & Therapeutics(구 응용약물학회지) Vol.22 No.2
Vesicular Stomatitis Virus G Glycoprotein and ATRA EnhancedBystander Killing of Chemoresistant Leukemic Cells by HerpesSimplex Virus Thymidine Kinase/Ganciclovir
Bin Li,Lei Wang,Lingqia Su,Sheng Chen,Zhaofeng Li,Jian Chen,Jing Wu 한국생물공학회 2012 Biotechnology and Bioprocess Engineering Vol.17 No.6
OmpA signal peptide mediated cgt gene from Paenibacillus macerans JFB05-01 was cloned and expressed in E. coli BL21 (DE3). The effects of glycine and Triton X-100 on extracellular production of α-cyclodextrin glycosyltransferase (α-CGTase) were investigated. When supplemented with Gly or Triton X-100 to the culture media individually, the secreted extracellular enzyme reached 32or 33 U/mL at 48 h of cultivation, respectively. When supplemented with Gly and Triton X-100 together, the extracellular α-CGTase activity reached 48 U/mL after 48 h cultivation, which was 20-fold of the control group without any additives. Analysis of membrane permeability demonstrated that addition of glycine and Triton X-100enhanced the permeability of both outer and inner membrane. The potential mechanism of the enhanced protein secretion was discussed.
Graphitization of graphene oxide films under pressure
Chen, Xianjue,Deng, Xiaomei,Kim, Na Yeon,Wang, Yu,Huang, Yuan,Peng, Li,Huang, Ming,Zhang, Xu,Chen, Xiong,Luo, Da,Wang, Bin,Wu, Xiaozhong,Ma, Yufei,Lee, Zonghoon,Ruoff, Rodney S. Elsevier 2018 Carbon Vol.132 No.-
<P><B>Abstract</B></P> <P>Lightweight, flexible graphite foils that are chemically inert, high-temperature resistant, and highly electrically and thermally conductive can be used as component materials in numerous applications. “Graphenic” foils can be prepared by thermally transforming graphene oxide films. For this transformation, it is desirable to maintain a densely packed film structure at high heating rates as well as to lower the graphitizing temperatures. In this work, we discuss the pressure-assisted thermal decomposition of graphene oxide films by hot pressing at different temperatures (<I>i.e.</I>, 300 °C, 1000 °C, or 2000 °C). The films pressed at 1000 °C or 2000 °C were subsequently heated at 2750 °C to achieve a higher degree of graphitization. The combination of heating and pressing promotes the simultaneous thermal decomposition and graphitic transformation of G-O films. Films pressed at 2000 °C as well as films further graphitized at 2750 °C show high chemical purity, uniformity, and retain their flexibility. For films pressed at 2000 °C and then further heated at 2750 °C, the mechanical performances outperform the reported values of the “graphite” foils prepared by calendering exfoliated graphite flakes; the electrical conductivity is ∼3.1 × 10<SUP>5</SUP> S/m and the in-plane thermal conductivity is ∼1.2 × 10<SUP>3</SUP> W/(m·K).</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Study on the Joining of 2D Microstructure during the Fabrication of 3D Micro-Mold
Bin Xu,Xiao-yu Wu,Jian-guo Lei,Feng Luo,Chen-lin Du,Shuang-chen Ruan,Zhen-long Wang 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
The 3D micro-mold which is fabricated by the femtosecond laser cutting and micro electric resistance slip welding is formed throughthe lamination of multilayer 2D microstructures. By using this technology, the 3D micro-mold with a high depth-width ratio can bemanufactured. In order to improve the laminated precision and joining strength of each layer of 2D microstructure, this researchapplied layer-by-layer micro electric resistance slip welding to weld each layer of 2D microstructure. Firstly, the proper technicalparameters were obtained through the experiments of layer-by-layer micro electric resistance slip welding. Secondly, through thelayer-by-layer micro electric resistance slip welding, multilayer 2D microstructures were weld together and a 3D micro-mold wasformed. Moreover, the anti-shear stress test of 3D micro-mold was done. In the layer-by-layer slip welding process, electrode couldproduce some losses and the losses could deposit on the surface of micro-mold. This research also studied the deposition effect ofthe electrode. Finally, based on the above studies, the micro square-hole array and the micro-gear cavity were fabricated by joiningmultilayer 2D microstructure.