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- 저자 : Hanzhi Wang (검색결과 3 건)
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Internal flow characteristics of a variable mixed flow turbine with partially-rotating vane nozzle
Hanzhi Zhang,Dazhong Lao,Ce Yang,Dengfeng Yang,Xiaoxiang Hou,Xinghua Wang 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.10
Variable nozzle turbine has advantages of improving engine low-speed performance; thus, it is widely applied in internal combustion engines. The present study analyzed the aerodynamic performance, especially the nozzle endwall leakage flow loss of a mixed flow turbine with variable nozzle, using 3D computational fluid dynamic simulation and test validation. Then, a partially-rotating vane nozzle was proposed to reduce the nozzle endwall clearance leakage flow to improve turbine efficiency. The results showed that at small nozzle opening condition, the front-part-vane rotating design can improve turbine efficiency up to 5.95 %, and the efficiency improvement of the rear-part-vane rotating design is approximately 5.08 %. At large nozzle opening condition, the front-part-vane rotating design has the same efficiency and flow capacity as the origin design, but the rear-part-vane rotating design cannot satisfy the flow capacity requirement. Detailed flow field analysis shows that the front-part-vane rotating design affects the velocity distribution at the rotor inlet due to nozzle endwall leakage flow. The leakage flow between the front part and the rear part of the nozzle causes a pressure jump at the pivoting axis.
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Research on the Negative Influence of Mobile Social Network : A Case Study of Facebook
Jie Sun,Hanzhi Wang 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.2
Nowadays, the use of mobile social network has occupied a number of user's daily life. The production of social network makes the user's life richer, and dating is not limited by time and space at all. On the other side, as for the mobile social network, the negative influence result from many respects, including the users' reliance on the mobile social network, their satisfaction about the mobile social network, the users' credibility to the mobile social network, the risk of mobile social network safety and so on. This research investigated the users’ attitude and behavior of Facebook mobile; collected data by questionnaires, literature research and interviews; discussed the negative influence on the mobile social network; finally proposed suggestions for mobile social network. By the research, it focused on the issue of mobile social network’s negative impacts on people’s life and benefit to provide a reliable data and evidence to mobile social network, the conclusions also contribute to mobile social network study and practice in China.
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Xiaoyuan Chi,Xiaowen Zhang,Xiangyu Guan,Ling Ding,Youxun Li,Mingqing Wang,Hanzhi Lin,Song Qin 한국미생물학회 2008 The journal of microbiology Vol.46 No.2
Polyunsaturated fatty acids (PUFAs) are important components of infant and adult nutrition because they serve as structural elements of cell membranes. Fatty acid desaturases are responsible for the insertion of double bonds into pre-formed fatty acid chains in reactions that require oxygen and reducing equivalents. In this study, the genome-wide characterization of the fatty acid desaturases from seven eukaryotic photosynthetic microalgae was undertaken according to the conserved histidine-rich motifs and phylogenetic profiles. Analysis of these genomes provided insight into the origin and evolution of the pathway of fatty acid biosynthesis in eukaryotic plants. In addition, the candidate enzyme from Chlamydomonas reinhardtii with the highest similarity to the microsomal Δ12 desaturase of Chlorella vulgaris was isolated, and its function was verified by heterologous expression in yeast (Saccharomyces cerevisiae).
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