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- 저자 : Xiaobo Ren (검색결과 5 건)
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Microstructure and quality of SiC foam filters for casting
Fengzhang Ren,Gangjun Zhai,Zhanhong Ma,Xiaobo Chen,Alex A. Volinsky 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.6
Maximum compressive strain at high temperature was introduced as a new quality indicator of ceramic foam filters used in metal casting. Maximum compressive strain at high temperature, number of thermal cycles before failure, room temperature compressive strength and bulk density of SiC-based ceramic foam filters with the same pore size produced by four manufacturers were measured. The best quality product exhibited the highest number of thermal cycles before failure and minimum strain at high temperature. Differences in properties were elucidated based on X-ray diffraction and scanning electron microscope microstructural characterization. The best quality filter has less glass phase and more quartz phase, while lower quality filters have more glass and cristobalite phases. The glass phase increases the maximum strain at high temperature, while both glass and cristobalite phases reduce the number of thermal cycles before failure. The maximum compressive strain at high temperature can be utilized as the main indicator for evaluating the quality of ceramic foam filters.
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Li Sun,Xiaobo Ren,Jianying He,Zhiliang Zhang 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.2
Powder-bed fusion additive manufacturing technology makes it possible to produce parts with complicated geometry and high accuracy. However, dimensional deviation caused by powder overmelting and dross formation is still a challenge for manufacturing thin channels. In this study, the origins of the overmelting of printed thin channels were analyzed and a concept called “melting cell” is proposed to describe and quantify the geometric error. Based on the geometrical relationship between the melting cell and target channel, a method for predicting and optimizing the final geometry of thin channels is outlined. In order to verify the method, geometries of thin horizontal circular channels in various sizes are studied as examples. The predicted results by the proposed method show a remarkable agreement with available experimental results. Moreover, a new egg-shaped compensated design, which is able to improve the dimensional accuracy of thin horizontal circular channels, is presented. The proposed method is simple yet very effective. It can be easily extended to the manufacturing of thin channels with various shapes, materials, and different powder bed fusion processes.
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Jieju Yue,Canming Tang,Yan Ren,Suijie Wu,Xiaobo Zhang,Huazhong Wang 한국유전학회 2014 Genes & Genomics Vol.36 No.4
Pollen development is disturbed in the microsporedevelopment stage of the double-recessive nuclearmale-sterile line ms5ms6 (Gossypium hirsutum L.). Thisstudy aimed to identify differentially expressed antherproteins and their potential roles in pollen development andmale sterility. We compared the proteomes of sterile andfertile anthers of the double recessive nuclear male-sterileline ms5ms6. Approximately 1,390 protein spots weredetected by two-dimensional differential gel electrophoresis. Proteins with altered accumulation levels in sterileanthers compared with fertile anthers were identified bymass spectrometry and the NCBInr and Viridiplantae ESTdatabases. Down-regulated proteins in the sterile anthersincluded cytosolic ascorbate peroxidase 1 and glutaminyltRNAsynthetase (glutamine-tRNA ligase). Several carbohydratemetabolism- and photosynthesis-related enzymeswere also present at lower levels in the mutant anthers. Bycontrast, ATP-dependent RNA helicase eIF4A-13, NADHdehydrogenase subunit 1, enolase, gibberellin 20-oxidase,gibberellin 3-hydroxylase 1, alcohol dehydrogenase 2d,3-ketoacyl-CoA synthase, and trehalose 6-phosphate synthasewere expressed at higher levels in sterile anthers thanin fertile anthers. The regulation of upland cotton pollendevelopment involves a complex network of differentiallyexpressed genes. This study provides the foundation forfuture investigations of gene function in upland cottonpollen development and male sterility.
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Design of h-BN-Filled Cyanate/Epoxy Thermal Conductive Composite with Stable Dielectric Properties
Yangxue Lei,Zengmao Han,Dengxun Ren,Hai Pan,Mingzhen Xu,Xiaobo Liu 한국고분자학회 2018 Macromolecular Research Vol.26 No.7
The thermal conductive cyanate ester/epoxy (CE/AG80) composites with hexagonal boron nitride (h-BN) reinforced were manufactured and investigated. The low and stable dielectric constant/loss of the composites with respect to both frequency (500 Hz-100 kHz) and temperature (50-350 °C) were discussed as functions of the content of h-BN. It was found that the low and stable dielectric constant/ loss of the composites can be maintained in the whole frequency range at room temperature, and the mutations of constant/loss at the frequency of 1 kHz occurred above 280 °C for all of the samples. Moreover, a remarkable enhancement of the thermal conductivity (0.54W/mK a 1.8-fold enhancement) was achieved with the introduction of h-BN and significantly outperformed traditional thermal conductive fillers. The significant improvements of the thermal conductivity of the composites were analyzed by the Agari’s model and the parameters of C1 and C2 were also calculated.
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Liang Rundong,Zhao Xiuwen,Hu Guichao,Yue Weiwei,Yuan Xiaobo,Ren Junfeng 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.7
InSe-based van der Walls heterostructures (vdWHs) have attracted research interests recently because of their particular properties. In this work, the electronic structure and the optical properties of Mn-doped InSe/WSe2 vdWHs are investigated by using first-principles calculations. Mn doping in InSe/WSe2 vdWHs induces an increase in the system's band gap. The optical properties of the vdWHs are also studied, and the absorption intensity of Mn-doped InSe/WSe2 is found to be enhanced in the near-infrared and ultraviolet regions. In addition, built-in electric fields are generated in InSe/WSe2 and Mn-doped InSe/WSe2, which can inhibit recombination of photogenerated electron-hole pairs. This work predicates the feasibility of enhancing the optical properties in InSe/WSe2 vdWHs by introducing dopants, which extends the applications of InSe materials in the field of optoelectronics.
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