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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.
Rong Rong,Huimin Zhao,Xiao Rong Gan,Shuo Chen,Xie Quan 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.1
An electrochemical sensor for the rapid, selective and sensitive detection of Pb2+ was developed using polypyrrole-graphene (PPY-rGO) nanocomposite by electrochemical synthesis. The PPYrGO-modified electrode possessed a large effective area because of unique 3D porous architectures, and it displayed excellent selectivity for the determination of Pb2+. The response of Pb2+ on the nanocomposite-modified electrode was evaluated, and the relevant parameters were optimized by square wave anodic stripping voltammetry (SWASV). The stripping response was highly linear (R2 = 0.987) over a Pb2+ concentration range of 5 X 10-9 mol/L to 7.5 X 10-7 mol/L, with a detection limit of 4.7 X 10-11 mol/L (3σ method). Furthermore, its applicability was validated for the determination of Pb2+ levels using spiked tap water at different concentrations. The polyporous structure, satisfactory reproducibility, long-term stability and simple synthesis endow the PPY-rGO nanocomposite a promising application in the determination of Pb2+.
Oridonin Suppresses Proliferation of Human Ovarian Cancer Cells via Blockage of mTOR Signaling
Xia, Rong,Chen, Sun-Xiao,Qin, Qin,Chen, Yan,Zhang, Wei-Wei,Zhu, Rong-Rong,Deng, An-Mei Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.2
Oridonin, an ent-kaurane diterpenoid compound isolated from the traditional Chinese herb Rabdosia rubescens, has shown various pharmacological and physiological effects such as anti-tumor, anti-bacterial, and anti-inflammatory properties. However, the effect of oridonin on human ovarian cancer cell lines has not been determined. In this study, we demonstrated that oridonin inhibited ovarian cancer cell proliferation, migration and invasion in a dose-dependent manner. Furthermore, we showed oridonin inhibited tumor growth of ovarian cancer cells (SKOV3) in vivo. We then assessed mechanisms and found that oridonin specifically abrogated the phosphorylation/activation of mTOR signaling. In summary, our results indicate that oridonin is a potential inhibitor of ovarian cancer by blocking the mTOR signaling pathway.
Heat transfer enhancement of pool boiling for a horizontal U-tube using TiO₂-R141b nanofluid
Rong-Horng Chen,Tong-Bou Chang 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.12
An experimental investigation is performed into the pool boiling heat transfer performance of TiO₂-R141b nanofluid containing 0vol%, 0.0001 vol%, 0.001 vol%, and 0.01 vol% TiO₂ nanoparticles. Scanning electron microscopy (SEM) and energy-dispersive X-rayspectrometry (EDS) observations reveal that some of the TiO₂ nanoparticles adhere to the heated surface during the boiling process. As aresult, the heat transfer performance is poorer than that obtained using pure R141b as the working fluid. Accordingly, a further investigationis performed in which the heated surface is vibrated ultrasonically. It is shown that the ultrasonic vibration creates an acoustic cavitationeffect, which inhibits the formation of the nano-sorption layer and improves the heat transfer performance as a result.
Influence of fiber direction and processing parameters on drilling temperature of CFRP
Rong Chen,Shujian Li,Chang Ping Li,Pengnan Li,Yong Jiang,Tae Jo Ko 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.4
Drilling high quality holes is a necessary prerequisite to ensure efficient and accurate connection and assembly of CFRP components. In addition to cutting force, cutting heat is another important factor affecting the quality of CFRP drilling. In this paper, a drilling experiment of CFRP laminate is carried out, and the method of prefabricating thermocouple holes on the edge of the test-hole is used to study the influence of fiber direction and processing parameters on the drilling temperature. Results show that when drilling along the fiber direction of 0°, the heat conduction in the edge area of test-hole wall is better than that of drilling along the fiber direction of 90°. Accordingly, the drilling temperature is obviously higher. Under this experimental condition, the temperature difference of the edge area of test-hole caused by the fiber direction is as high as 44 °C. At the feed rate of 0.04 mm/rev, when the speed increases from 1500 rpm to 4500 rpm, the axial force decreases by 13.9 %, and the peak temperature at p1 and v1 increase by 63.2 % and 22.2 %, respectively. At the spindle speed of 3000 rpm, when the feed rate increases from 0.02 mm/rev to 0.06 mm/rev, the drilling axial force increases by 35.0 %, and the peak temperature at p1 and v1 decreases by 31.1 % and 30.0 %, respectively.
Chen, Rong,Shimizu Tomoharu,Iwabuchi Akira,Shin, Hyung Seop ENGINEERING TRIBOLOGY RESEARCH INSTITUTE KYUNGPOOK 1998 INTERNATIONAL SYMPOSIUM ON HIGH PERFORMANCE OF TRI Vol.1998 No.-
The sliding wear behavior of NiAl and SiC particles reinforced aluminum alloy matrix composites against S45C steel was studied. The special attention was focus on the effect of applied load on the wear resistance of particle reinforced composites. The wear rates of NiAlp/Al and SiCp/Al composites at loads below 3.5N or above 13.5N were much lower than those of aluminum alloy, however, the wear rates of composites are increased to a levels comparable to that of unreinforced aluminum alloy in the middle applied loads. The SiCp/Al composites abraded the counterface materials S45C steel at higher wear rates than aluminum alloy at the entire applied load range. However, the NiAlp/Al composites abraded the steel at the maximum wear rete at lower loads near 5 N even if the hardness of NiAl particle is smaller than that of SiC. As load increased, the wear rates of steel against NiAlp/Al became smaller and were almost the same as those worn against aluminum.
A site-specific CFD study of passing ship effects on multiple moored ships
Chen, Hamn-Ching,Chen, Chia-Rong,Huang, Erick T. Techno-Press 2019 Ocean systems engineering Vol.9 No.1
A local-analytic-based Navier-Stokes solver has been employed in conjunction with a compound ocean structure motion analysis program for time-domain simulation of passing ship effects induced by multiple post-Panamax class ships in the exact condition of a real waterway. The exact seabed bathymetry was reproduced to the utmost precision attainable using the NOAA geophysical database for Virginia Beach, NOAA nautical charts for Hampton Roads and Norfolk harbor, and echo sounding data for the navigation channel and waterfront facilities. A parametric study consists of 112 simulation cases with various combinations of ship lanes, ship speeds, ship heading (inbound or outbound), channel depths, drift angles, and passing ship coupling (in head-on or overtaking encounters) were carried out for two waterfront facilities at NAVSTA Norfolk and Craney Island Fuel Terminal. The present paper provides detailed parametric study results at both locations to investigate the site-specific passing ship effects on the motion responses of ships moored at nearby piers.