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.

The Effect of Trombe Wall on Indoor Humid Climate in Dalian, China

Bin Chen,Hhuijuan Chen,Shirong Meng,Xin Chen,Peng Sun,Yinghui Ding 한국태양에너지학회 2004 한국태양에너지학회 학술대회논문집 Vol.- No.-

Non-isothermal Crystallization Behavior, Rheological and Thermal Conductive Properties of Recycled Polyethylene Terephthalate/Polyethylene Blends

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.

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.

建筑考古视角下凤林古城空间特点探究

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.

$$\mathcal{N} $$ = 2 SCFTs: an M5-brane perspective

Chen, Bin,Ó,Colgá,in, Eoin,Wu, Jun-Bao,Yavartanoo, Hossein Springer-Verlag 2010 Journal of high energy physics Vol.2010 No.4

Experimental study on vibration serviceability of cold-formed thin-walled steel floor

Bin Chen,Liang Cao,Faming Lu,Y. Frank Chen 국제구조공학회 2023 Steel and Composite Structures, An International J Vol.46 No.4

In this study, on-site testing was carried out to investigate the vibration performance of a cold-formed thin-walled steel floor system. Ambient vibration, walking excitation (single and double persons), and impulsive excitation (heel-drop and jumping) were considered to capture the primary vibration parameters (natural frequencies, damping ratios, and mode shapes) and vertical acceleration response. Meanwhile, to discuss the influence of cement fiberboard on structural vibration, the primary vibration parameters were compared between the systems with and without the installation of cement fiberboard. Based on the experimental analysis, the cold-formed thin-walled steel floor possesses high frequency (> 10 Hz) and damping (> 2%); the installed cement fiberboard mainly increases the mass of floor system without effectively increasing the floor stiffness and may reduce the effects of primary vibration parameters on acceleration response; and the human-structure interaction should be considered when analyzing the vibration serviceability. The comparison of the experimental results with those in the AISC Design Guide indicates that the cold-formed thin-walled steel floor exhibits acceptable vibration serviceability. A crest factor βrp (ratio of peak to root-mean-square accelerations) is proposed to determine the root-mean-square acceleration for convenience.

A Two-Dimensional Risk Assessment Method for Oil and Gas Pipelines Based on “Accident Probability–Reputation Loss”

Chen Xuefeng,Chen Wentao,Zhang Yifu,Peng Bin,Wang Yuling,Xu Mingwei 한국화학공학회 2024 Korean Journal of Chemical Engineering Vol.41 No.1

Oil and gas pipeline accidents not only caused personnel casualties, economic losses and environmental pollution but also brought great panic to the public. To provide accurate accident prevention strategies, risk assessment (RA) has been widely used in the oil and gas pipeline industry. It aims to quantify the potential risk due to unexpected eventualities. However, the current RA methods mainly pay attention to the tangible risk (such as the human safety risk, economic risk and environmental risk), and the intangible risk (such as reputation loss risk) is often neglected. This cannot refl ect the real risk for the oil and gas pipeline. To settle existing research limitation, a two-dimensional risk assessment method for oil and gas pipelines based on “accident probability–reputation loss” is proposed. The method mainly involves four steps, namely, risk identifi cation, probability calculation, consequence assessment and risk assessment. The proposed method is used to quantitatively assess a natural gas pipeline in central China. Its results indicate that pipeline risk is unacceptable due to the unacceptability of accident probability and various dimensions of risk. Therefore, this study can enrich and develop the current oil and gas pipeline RA method to refl ect the real risk of oil and gas pipeline accidents.

Ellipsometric Study of the Optical Properties of Silicon-Based Si:SiO2 Composite Thin Films under Different Annealing Temperatures

Bin Sun,Yu-Xiang Zheng,Cong-Hui Xu,Liang-Yao Chen,Peng Zhou,Yue-Rui Chen,Yu-Fei Kong 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.5I

In our work, silicon and silica composite .lms were prepared by using a magnetron sputtering method, and the samples were annealed in the temperature range between 200 ±C and 600 ±C. After annealing, the samples were investigated by spectroscopic ellipsometry (SE), and the SE spectra were measured in the range of 1.5 eV ≫ 4.5 eV with a dual-rotating-element ellipsometer. In order to investigate the microstructure information of the .lm by .tting the SE spectra using the eective- medium approximation (EMA), we modeled the whole .lm by using a multilayer optical model including a surface oxide layer, a composite layer, and substrate layer. We used dierent mixtures to describe the composite layer, and .nally we found that a mixture of amorphous silicon (a-Si), polycrystalline silicon (p-Si), and silicon dioxide had the best .t to the SE spectra. Whereafter, we studied the dependences of the surface roughness, the layer structure, and the composition on the dierent annealing temperatures and found that with increasing annealing temperature, the surface oxide layer grew in thickness, the silicon dioxide maintained its volume fraction, and a-Si transferred to p-Si.

Hierarchical Saliency: A New Salient Target Detection Framework

Bin Chen,Xuezhuan Zhao,Lishen Pei,Tao Li,Mingxia Li 제어·로봇·시스템학회 2016 International Journal of Control, Automation, and Vol.14 No.1

Simulating the shift character of visual attention, we propose a novel concept of hierarchical saliencyand develop a detection framework. First, a given image is over-segmented into coarse and fine layers whichrespond to two scale superpixels. Then, we estimate the saliency maps from coarse to fine. In the coarse layer, wepresent a new self-adaptive algorithm to construct the superpixels graph, employing the manifold ranking approachto optimize it. In the fine layer, sparse reconstruction is used to obtain the saliency regions. At last, we proposea Restricted Voting Strategy (RVS) to fuse two layer saliency maps into one hierarchical saliency map. Differentfrom the prior methods, the targets of the final map are labeled layer-wise. The final result can be directly applied tomore high-level computer vision tasks in various situations. For the requirement of hierarchical saliency evaluation,we construct the CAS-HAS dataset. We exhaustively evaluate the framework on the proposed data set and threebenchmark data sets. The experiment performance is comparable with the sate-of-the-art approaches.