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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.
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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.
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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.
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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.
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Study on Crystallization Kinetics of Dynamically-Vulcanized PP/EPDM Blends
Bin Yang,Yan-Li Deng,Xia Ru,Ji-Bin Miao,Ming Cao,Jia-Sheng Qian,Li-Fen Su,Peng Chen,Jing-Wang Liu,La-Xia Wu,Tao Pang 한국고분자학회 2016 폴리머 Vol.40 No.4
Two types of β nucleating agents (β-NAs), aryl dicarboxylic acid amide (TMB-5) and diphenyl phthalate diamine (NT-C), were adopted to modify the polypropylene (PP)/ethylene propylene diene monomer (EPDM) blends, which were prepared by dynamic-vulcanization technology. Wide angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC) were used to study the crystallization kinetics of PP. Our results showed that the addition of β-NAs can considerably increase the crystallization temperature, and significantly decrease the spherulite size of β-PP (L300). The Jeziorny analysis showed there were ~82% and ~89% of relative crystallinity generated from the primary crystallization in the composites containing TMB-5 and NT-C, respectively. The crystallization half time (t0.5) showed that NT-C improved the overall crystallization rate more effectively than TMB-5. In addition, the peaks of the relative crystallization rate curves were shifted towards higher temperature by 14 and 9℃ with the addition of TMB-5 and NT-C, respectively.
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Bin Chen,Ning Zhang 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.1
Information technology has entered a big-data era. Large-scale data is becoming the basic factors of production and it would affect the corporate social responsibility disclosure deeply, the use of big data has become the key factor to improve the competitiveness of enterprises. Through this empirical analysis, we can draw the following conclusions: corporate social responsibility is mainly composed of economic responsibility, legal responsibility, ethical responsibility and spontaneous responsibility. And CSR will have positive effect on organizational performance. All of these indicate that prompting enterprises staff to fulfill corporate social responsibility is helpful to improve the organizational performance.
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Recrystallization and Microstructural Evolution During Hot Extrusion of Mg97Y2Zn1 Alloy
Bin Chen,Xiaoling Li,Chen Lu,Dongliang Lin 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.3
This study revealed that the extrusion temperature has a great influence on microstructure and mechanicalproperties of the Mg97Y2Zn1 alloy. The average grain sizes increased from 3 μm to 8 μm with increasingextrusion temperatures from 623K to 773 K. Both dynamic recrystallization (DRX) and static recrystallization(SRX), which occur during and after deformation, respectively, were observed. The alloy, which extrudedat a relatively high temperature, exhibited lower strength because the strain strengthening was balanced bythe softening that originated from DRX. Three types of morphologies, namely, big recrystallized grains, fine recrystallizedgrains, and non-recrystallized grains, were observed in the extruded microstructures obtained at 623 K. The dislocation density was quite high in the fully recrystallized grain. The extruded microstructures obtainedat 773 K were composed of large grains with more uniform size. Their degree of recrystallization was higherand the dislocation density also declined. All dislocation in the grain were distinguished as <c+a> dislocations. Submicron scale precipitates were distributed along the newly formed recrystallized grain boundaries andhad a remarkable pinning effect on the recrystallized grain growth after extrusion at 773 K. The precipitates canbe divided into two main types: mixed type and single type.
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Surgical Treatment for Early Esophageal Squamous Cell Carcinoma
Chen, Shao-Bin,Weng, Hong-Rui,Wang, Geng,Yang, Jie-Sheng,Yang, Wei-Ping,Liu, Di-Tian,Chen, Yu-Ping,Zhang, Hao Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.6
More studies are needed to clarify treatments and prognosis of early esophageal squamous cell carcinoma (ESCC). This retrospective study was designed to review the outcome of surgical treatment for early ESCC, evaluate the results of a left thoracotomy for selected patients with early ESCC, and identify factors affecting lymph node metastases and survival. The clinicopathological data of 228 patients with early ESCC who underwent transthoracic esophagectomy with lymphadenectomy without preoperative adjuvant treatment were reviewed. The ${\chi}^2$ test or Fisher's exact test were used to detect factors related to lymph node metastasis. Univariate and multivariate analyses were performed to identify prognostic factors. There were 152 males and 76 females with a median age of 55 years. Two hundred and eight patients underwent a left thoracotomy, and the remaining 20 patients with lymph nodes in the upper mediastinum more than 5 mm in short-axis diameter by computed tomography scan underwent a right thoracotomy. No lymph node metastasis was found in the 18 patients with carcinoma in situ, while lymph node metastases were detected in 1.6% (1/62) of patients with mucosal tumours and 18.2% (27/148) of patients with submucosal tumours. Only 7 patients showed upper mediastinal lymph node metastases in the follow-up. The 5- and 10-year overall survival rates were 81.4% and 70.1%, respectively. Only histologic grade (P<0.001) and pT category (P=0.001) significantly correlated with the presence of lymph node metastases. In multivariate analysis, only histologic grade (P=0.026) and pT category (P=0.008) were independent prognostic factors. A left thoracotomy is acceptable for selected patients with early ESCC. Histologic grade and pT category affected the presence of lymph node metastases and were independent prognostic factors for early ESCC.
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