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RISS 인기검색어
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- 저자 : HAIJUN SHEN (검색결과 5 건)
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COLLISION AND ENERGY TRANSFER BETWEEN C60 FULLERENES IN AN Ar-ATOMS-FILLED CARBON NANOPEAPOD
HAIJUN SHEN 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2007 NANO Vol.2 No.1
By the molecular dynamics (MD) method, the collision and energy transfer between C60 fullerenes in an Ar-atoms-filled carbon nanopeapod were simulated. Furthermore, according to the simulated results, the effects of the Ar atom density and the initial energy of the incident C60 fullerene on the energy transfer rate of the carbon-peapod were discussed. It is shown that the energy transfers between C60 fullerenes through their mutual compression and elastic deformation, and that the lower the Ar atom density and the initial energy of the incident C60 fullerene are, the higher the energy transfer rate of the carbon-peapod is.
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KINETIC RESISTANCE OF CARBON FULLERENES IN AQUEOUS SOLUTION
HAIJUN SHEN 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2007 NANO Vol.2 No.4
By using the molecular dynamics (MD) method, the deceleration of Cn (n = 60, 180, 240, 540) and C60@C240 fullerenes is simulated in aqueous solution. The curves of resistance–velocity and resistance–Renault (Re) number are also obtained. Further the MD results are compared with the Stokes ones of sphere, i.e., the macroscopic theoretical fluid mechanics (FM) results for low Re number. It is shown that under low Re number, the resistance of the fullerenes in aqueous solution is higher than the Stokes results by two orders of magnitude, and it can be estimated through the Stokes results multiplied by (110.38 - 1.48/Re).
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Wei Li,Haijun Shen 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.2
We present a finite element model of laminated composite cylindrical shells with piezoelectric layers by using layerwise theory. The formulation, which is based on Reddy’s layerwise displacement theory, involves the coupling between mechanical deformations and electric displacements. The full layerwise theory is used to represent the total displacement field and electric potential, and then a finite element model has been formulated based on the developed mechanics by employing Hamilton’s principle and variational method. This layerwise finite element model can give an accurate description of displacement field at the ply level and can model complex boundary conditions. Numerical example of a simply-supported laminated piezoelectric composite shell for static response and free vibration analysis was implemented to evaluate the efficiency and accuracy of the present method. Numerical results obtained with the present method are in excellent agreement with other similar solutions.
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Current progress on gold recovery from refractory ore and waste electrical and electronic equipment
Ji Xuran,Shen Zhijie,Xu Wenping,Yao Shimiao,Zhang Hairong,Xiong Lian,Li Hailong,Guo Haijun,Chen Xuefang,Chen Xinde 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.9
The physical and chemical properties of gold promote its application, such as in the high-tech, electronic products, and aerospace industries. The easily leachable ore is gradually depleted. Thus, it becomes necessary to extract gold from other resources such as refractory ore and electrical and electronic equipment. The normal method of leaching for gold is cyanide leaching, but it is very dangerous for both environment and operator. Non-cyanide leaching methods, including thiourea leaching, halide leaching, and sulfate leaching have been developed to substitute cyanide leaching. A variety of methods to enrich gold from leaching solutions are described in this paper, including solvent extraction, electrowinning, activated carbon adsorption, and ion exchange resins. Among those methods, ion exchange resins can adsorb gold with high adsorption efficiency and regenerate easily as well. This paper focuses on the research progress of the recovery of gold from non-cyanide leachates by ion exchange resins, summarizes the existing resin types and elution processes, points out the limitations in the application of current ion exchange resins, and discusses possible solutions.
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Xiao Weixing,Zhou Haijun,Chen Bingrong,Shen Bin,Zhou Jun 한국유전학회 2022 Genes & Genomics Vol.44 No.6
Background: Metastasis and chemo-resistance are still important factors that limit the overall efficacy of colorectal cancer treatment. Understanding the detailed molecular mechanism and identifying potential biomarkers are of great value in prognosis prediction and risk stratification. Objective: We investigated the role of miR-582-5p in colorectal cancer pathogenesis, progression and chemo-resistance. Furthermore, we explored the underlying molecular mechanism of miR-582-5p in modulation of malignant behaviors of colorectal cancer cells. Methods: Clinical samples and colorectal cancer cell lines were applied to explore miR-582-5p expression level and its significance on tumor cell metastasis and chemo-resistance. Transwell study and cellular survivability study were performed to explore the influences of miR-582-5p expression modulation on tumor cell chemo-resistance and invasion/migration. Dual-luciferase reporter gene assay was conducted to explore the influences of miR-582-5p on its target gene TNKS2. Results: Colorectal cancer patients with lymph node or distal organ metastatic diseases exhibited significantly lower level of miR-582-5p. In vitro studies have indicated that miR-582-5p inhibition significantly increased migration and chemo-resistant capabilities of tumor cells. And dual-luciferase reporter gene assay demonstrated that miR-582-5p exhibited its influences on the biological behavior of tumor cells by targeting TNKS2. Conclusions: Our study demonstrated for the first time that miR-582-5p played an important role for colorectal tumor cell metastasis and chemo-resistance. Our research also indicated that miR-582-5p and its target gene TNKS2 could be novel biomarkers for metastatic disease prediction, overall prognosis evaluation, as well as potential therapeutic target for colorectal cancer patients.
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