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- 저자 : Zhinan (검색결과 25 건)
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Anisotropic Characteristic of Irregular Columnar-jointed Rock Mass Based on Physical Model Test
Zhinan Lin,Weiya Xu,Huanling Wang,Jiuchang Zhang,Wang Wei,Rubin Wang,Hua Ji 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.5
Columnar joint is a special geological structure with self-organized joint network which separates the rock into an assemblage of blocks. The mechanic characteristics of irregular columnar-jointed rock mass (ICJRM) are dependent not only on the intact rock material but also on unique types of columnar joints. In effort to understand the anisotropic mechanic characteristics of ICJRM by the inherent anisotropic nature of the jointed structure, we conducted a series of uniaxial compression tests. Experiments were performed on an artificial ICJRM of 50 mm in diameter and 100 mm high. The “intact material” consisted of cement mortar and the columnar joints of photosensitive resins. The columnar joint in the specimen was made into six different orientations: 0°, 30°, 45°, 60°, 75°, and 90°, respectively, so observe the deformation behavior and failure modes of ICJRM with different various angles between the loading orientation and columnar joint were observed. Based on the analysis of the test results, the uniaxial compression strength and elastic modulus of ICJRM showed strong anisotropic behavior along with a special “U” shape in response to the angle between the loading orientation and columnar joint. Furthermore, the failure modes of ICJRM was observed.
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Catalytic oxidation of sulfur dioxide over -Fe2O3/SiO2 catalyst promoted with Co and Ce oxides
Zhinan Yan,Yong Kang,Dan Li,Yu Chun Liu 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.4
Hematite (-Fe2O3) is a promising alternative to the catalysts currently used due to its low cost, fairly good activity and environmentally friendly properties. In this study, -Fe2O3/SiO2 nanocatalysts promoted with cobalt and cerium (Co3O4-CeO2--Fe2O3/SiO2) were prepared via wet co-impregnation method, and the effects of promoters on catalytic performances for SO2 oxidation at different temperatures, SO2 concentrations, cycle numbers, catalytic stability as well as catalyst charging were investigated. The results indicated that SO2 conversion rose with the increasing of catalyst charging and SO2 concentration. Also, the as-prepared catalyst had the maximum SO2 conversion at the reaction temperature of 500 oC, excellent catalytic recyclability and activity stability. Its physicochemical and redox properties were characterized by XRD, BET, SEM, FT-IR and XPS. The results of XRD and FT-IR spectra confirmed that the formation of Ce2FeO4 network in the Co-Ce co-doped catalysts proved the promoting effect of cerium on higher valence state of the active ingredient. The N2 adsorption/desorption results evidenced that cerium could increase the proportion of mesoporous, and the XPS spectra indicated that cobalt and cerium in the catalysts could increase the available oxygen (O/O) for the redox reaction. Due to its excellent low onset temperature, fairly good activity and environmentally friendly properties, the as-prepared catalyst of Co3O4-CeO2--Fe2O3/SiO2 appeared to be more efficient for the SO2 conversion in a large concentration range.
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Zhinan Xu,Limei Fang,Jianping Lin,Xiaoxia Jiang 한국생물공학회 2006 Biotechnology and Bioprocess Engineering Vol.11 No.1
The asymmetric biosynthesis of ethyl (S)-4-chloro-3-hydrobutanoate from ethyl 4-chloro-3-oxobutanoate was investigated by using whole cells of Candida magnoliae JX120-3 without the addition of glucose dehydrogenase or NADP+/NADPH. In a one-phase system, the bioconversion yield was seriously affected on the addition of 12.1 g/L ethyl 4-chloro-3-oxobutanoate. In order to reduce this substrate inhibition, a water/n-butyl acetate two-phase system was developed, and the bioreduction conditions optimized with regard to the yield and product enantiometric excess value. The optimal conditions were as following: water to n-butyl acetate volume ratio of 1:1, 4.0 g DCW/L active cells, 50 g/L glucose and 35°C. By adopting a dropwise substrate feeding strategy, high concentration of ethyl 4-chloro-3-oxobutanoate (60 g/L) could be asymmetrically reduced to ethyl (S)-4-chloro-3-hydrobutanoate with high yield (93.8%) and high enantiometric excess value (92.7%).
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Zhinan Xu,Feng Shi,Peilin Cen 한국생물공학회 2006 Biotechnology and Bioprocess Engineering Vol.11 No.3
The components of the media used to elicit the biosynthesis of poly-γ-glutamic acid (γ-PGA) by Bacillus subtilis ZJU-7 were investigated, particularly the carbon and nitrogen sources. Of the 7 carbon sources investigated, sucrose induced the highest rate of γ-PGA productivity; among the nitrogen sources, tryptone had the best effect for γ-PGA production. A 26-2 fractional factorial design was used to screen factors that influence γ-PGA production significantly, and a central composite design was finally adopted to formulate the optimal medium. γ-PGA productivity improved approximately 2-fold when the optimal medium was used compared with the original nonoptimized medium, and volumetric productivity reached a maximum of 58.2 g/L after a 24-h cultivation period.
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Zhinan Xu,Xiangting Wu,Linmei Tang,Yinming Du 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.6
PEG-Dextran and PEG-salt aqueous two-phase systems (ATPS) have been applied to separate glutathione (GSH) from crude yeast extracts. Single-factor experiments were carried out to determine the important factors influencing the partition coefficient and extraction yield. The effect of PEG molecular weight, phase-forming components,PEG and Dextran concentration, pH value, and temperature on the GSH partitioning behavior in ATPS was investigated. Three factors, Dextran concentration, pH value, and temperature, were confirmed to have significant influence on the partition coefficient and extraction yield. These factors were further analyzed with the aid of central composite rotatable design and response surface methodology. The optimal conditions for GSH extraction in the PEGDextran system were determined, including PEG molecular weight 6,000, 10% PEG concentration, 14% Dextran concentration,pH 5.2, and temperature 32 oC. A high extraction yield (83.55%) of GSH from crude yeast extracts was achieved under these optimized conditions. This work is very helpful for developing one efficient and cost-effective process for the separation and purification of GSH from yeast broths.
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Zhinan Lin,Weiya Xu,Wei Wang,Huanling Wang,Rubin Wang,Hua Ji,Jiuchang Zhang 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.9
The strength behavior and deformation modulus of columnar jointed rock mass have been investigated by conducting a series of uniaxial compressive tests, along with consideration of columnar joint effect. The tests have been performed on the artificial physical model samples, incorporating different angles β (which was the between the loading direction and axial direction of the columns) and heights of specimen. Columnar joint is a special geological structure with self-organized joint network which separates the rock into an assemblage of blocks. Due to the special joint network, the anisotropic characteristics of columnar joint rock mass is very remarkable. The physical model consisted of “intact rock” and “jointed filler”, replaced by cement mortar and white cement, respectively. The angle β were set to 0°, 15°, 30°, 45°, 60°, 75° and 90°, respectively, and the heights of specimen were set to five different values. Through the test, failure strength and failure modes of columnar joint rock mass with different angles β were observed. Based on the analysis of the test results, the uniaxial compression strength and average modulus of columnar joint rock mass showed strong anisotropy, showing a special “U” shape in terms of loading orientation. The size effect of columnar jointed rock mass was very typical, and the failure mode of columnar joint rock mass were analyzed. Furthermore, the relationship between failure strength and joint factor was studied.
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Guo, Zhinan,Hwang, Joonki,Zhao, Bing,Chung, Jin Hyuk,Cho, Soo Gyeong,Baek, Sung-June,Choo, Jaebum The Royal Society of Chemistry 2014 The Analyst Vol.139 No.4
<P>We report an ultra-sensitive surface-enhanced Raman scattering (SERS)-based detection system for 2,4,6-trinitrotoluene (TNT) using nano-dumbbell structures formed by the electrostatic interaction between positively and negatively charged gold nanoparticles. First, Meisenheimer complexes were produced between TNT and <SMALL>L</SMALL>-cysteine on gold substrates, and 4-mercaptopyridine (4-MPY) labeled gold nanoparticles (positively charged) were allowed to interact with the Meisenheimer complexes through the electrostatic interaction between the negatively charged aromatic ring of the complex molecules and the positively charged nanoparticles. Then, negatively charged gold nanoparticles were added in order to form nano-dumbbells. As a result, many hot junctions were generated by the dumbbell structures, and the SERS signals were greatly enhanced. Our experimental results demonstrate that the SERS-based assay system using nano-dumbbells provides an ultra-sensitive approach for the detection of TNT explosives. It also shows strong potential for broad application in detecting various explosive materials used for military purposes.</P> <P>Graphic Abstract</P><P>We report an ultra-sensitive surface-enhanced Raman scattering (SERS)-based detection system for 2,4,6-trinitrotoluene (TNT) using nano-dumbbell structures formed by the electrostatic interaction between positively and negatively charged gold nanoparticles. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3an01931d'> </P>
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Xua Zhinan,Fang Limei,Lin Jianping,Jiang Xiaoxia,Liu Ying,Cen Peilin The Korean Society for Biotechnology and Bioengine 2006 Biotechnology and Bioprocess Engineering Vol.11 No.1
The asymmetric biosynthesis of ethyl (S)-4-chloro-3-hydrobutanoate from ethyl 4-chloro-3-oxobutanoate was investigated by using whole cells of Candida magnoliae JX120-3 without the addition of glucose dehydrogenase or $NADP^+/NADPH$. In a one-phase system, the bioconversion yield was seriously affected on the addition of 12.1 g/L ethyl 4-chloro-3-oxobutanoate. In order to reduce this substrate inhibition, a water/ n-butyl acetate two-phase system was developed, and the bioreduction conditions optimized with regard to the yield and product enantiometric excess value. The optimal conditions were as following: water to n-butyl acetate volume ratio of 1:1, 4.0 g DCW/L active cells, 50 g/L glucose and $35^{\circ}C$. By adopting a dropwise substrate feeding strategy, high concentration of ethyl 4-chloro-3-oxobutanoate (60 g/L) could be asymmetrically reduced to ethyl (S)-4-chloro-3-hydrobutanoate with high yield (93.8%) and high enantiometric excess value (92.7%).
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발레리오 올지아티와 왕슈의 주택 비교를 통한 건축적 자율성과 표현에 관한 연구
장즈난(Zhang, ZhiNan),김인성(Kim, In-Sung) 한국주거학회 2022 한국주거학회 학술대회논문집 Vol.33 No.2
The difference in perspective on nature is revealed in the difference in architectural expression. Valerio Olgiati and Wang Shu, compared in this study. shows such a difference in their architecture. However, this study paid attention to the common point that both architects wanted to find a new breakthrough in modern architecture through the most essential thinking about architecture. To figure out the similarities and differences between the approaches of Olgiati and Wang shu, we established a concept framework after analysing their various works and articles. We selected their private housing projects, and compared their architectural characteristics according to the framework. The study found that both of them started from the geometrical order using concrete structure, and focused on the basic architectural elements of walls and roofs, opening and closing, and light and darkness. The methodological differences were basically due to their cultural background and location of architecture. Olgiati insisted on pure architecture without reference, experimenting with vivid architectural ideas that create novelty through geometric transformations of spaces and elements that provoked specific intended senses and thoughts. On the other hand, Wang Shu imposed a play of tradition on geometrical rigor, and tried to awaken more suggestive memories and senses by adding traditional materials to the purity of concrete.
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발레리오 올지아티와 왕슈의 주택 비교를 통한 건축적 자율성과 표현에 관한 연구
장즈난(Zhang, ZhiNan),김인성(Kim, In-Sung) 한국주거학회 2022 한국주거학회 학술대회논문집 Vol.34 No.1
The difference in perspective on nature is revealed in the difference in architectural expression. Valerio Olgiati and Wang Shu, compared in this study. shows such a difference in their architecture. However, this study paid attention to the common point that both architects wanted to find a new breakthrough in modern architecture through the most essential thinking about architecture. To figure out the similarities and differences between the approaches of Olgiati and Wang shu, we established a concept framework after analysing their various works and articles. We selected their private housing projects, and compared their architectural characteristics according to the framework. The study found that both of them started from the geometrical order using concrete structure, and focused on the basic architectural elements of walls and roofs, opening and closing, and light and darkness. The methodological differences were basically due to their cultural background and location of architecture. Olgiati insisted on pure architecture without reference, experimenting with vivid architectural ideas that create novelty through geometric transformations of spaces and elements that provoked specific intended senses and thoughts. On the other hand, Wang Shu imposed a play of tradition on geometrical rigor, and tried to awaken more suggestive memories and senses by adding traditional materials to the purity of concrete.
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