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A SURVEY OF RECENT PATENTS OF FIN-AND-TUBE HEAT EXCHANGERS FROM 2001 TO 2009
Wang, Chi-Chuan The Society of Air-Conditioning and Refrigerating 2010 International Journal Of Air-Conditioning and Refr Vol.18 No.1
This study presents the updated information about patents of the fin-and-tube heat exchangers during 2001-2009. A total of 23 patents were examined and some explanations about how the work are provided. Fin patterns like convex-louver, enhanced wavy, enhanced slit, enhanced louver, vortex generators, and special fin pattern are reported in the present review paper. It is recommended that further detailed examinations via numerical simulation or experimental investigation be carried out in the future to gain further insight to these fin designs.
RECENT ADVANCES IN FIN-AND-TUBE HEAT EXCHANGER
CHI-CHUAN WANG 대한설비공학회 2011 International Journal Of Air-Conditioning and Refr Vol.19 No.4
The objective of this paper is to summarize the recent progress of fin pattern designs. Some of the designs are from the applied patents and some are from the recent literatures. The fin patterns include interrupted surfaces, enhanced wavy and the vortex generators. Benefits and the associated constraints of these designs are discussed. To effectively improve the heat transfer performance, asymmetric designs offer some promising features in the advanced fin patterns. Moreover, concave depression such as cavity design show significant advantages over conventional interrupted fin surfaces. It is recommended that further detailed examinations on the relevant concepts either via numerical simulation or experimental implementation are carried out in the future to gain further insight into the designs.
A SURVEY OF RECENT PATENTS OF FIN-AND-TUBE HEAT EXCHANGERS FROM 2001 TO 2009
CHI-CHUAN WANG 대한설비공학회 2010 International Journal Of Air-Conditioning and Refr Vol.18 No.1
This study presents the updated information about patents of the fin-and-tube heat exchangers during 2001-2009. A total of 23 patents were examined and some explanations about how they work are provided. Fin patterns like convex-louver, enhanced wavy, enhanced slit, enhanced louver, vortex generators, and special fin pattern are reported in the present review paper. It is recommended that further detailed examinations via numerical simulation or experimental investigation be carried out in the future to gain further insight to these fin designs.
Han-Chuan Chuang,Yu-Huai Ho,Chorng-Jang Lay,Lih-Shinn Wang,Yeong-Shu Tsai,Chen-Chi Tsai 대한의학회 2011 Journal of Korean medical science Vol.26 No.11
This study aimed to compare the clinical presentations of Aeromonas hydrophila, A. veronii biovar sobria and A. caviae monomicrobial bacteremia by a retrospective method at three hospitals in Taiwan during an 8-yr period. There were 87 patients with A. hydrophila bacteremia, 45 with A. veronii biovar sobria bacteremia and 22 with A. caviae bacteremia. Compared with A. hydrophila and A. veronii biovar sobria bacteremia, A. caviae bacteremia was more healthcare-associated (45 vs 30 and 16%; P = 0.031). The patients with A. caviae bacteremias were less likely to have liver cirrhosis (27 vs 62 and 64%;P = 0.007) and severe complications such as shock (9 vs 40 and 47%; P = 0.009) and thrombocytopenia (45 vs 67 and 87%; P = 0.002). The APACHE II score was the most important risk factor of Aeromonas bacteremia-associated mortalities. The APACHE II scores of A. caviae bacteremias were lower than A. hydrophila bacteremia and A. veronii biovar sobria bacteremia (7 vs 14 and 16 points; P = 0.002). In conclusion, the clinical presentation of A. caviae bacteremia was much different from A. hydrophila and A. veronii biovar sobria bacteremia. The severity and mortality of A. caviae bacteremia were lower than A. hydrophila or A. veronii biovar sobria bacteremia.
Huan Yang,Ying Wang,Chi Ma,Chuan Sun,Yingchun Liu,Kaifeng Wu,Ming Li,Gerelt Borjigin,Feng Gao 아세아·태평양축산학회 2019 Animal Bioscience Vol.32 No.2
Objective: An experiment was conducted to investigate the effects of feed intake restriction during late pregnancy on the function, anti-oxidation capability and acute phase protein synthesis of ovine liver. Methods: Eighteen time-mated ewes with singleton fetuses were allocated to three groups: restricted group 1 (RG1, 0.18 MJ ME/kg W0.75 d, n = 6), restricted group 2 (RG2, 0.33 MJ ME/kg W0.75 d), n = 6) and a control group (CG, ad libitum, 0.67 MJ ME/kg W0.75 d, n = 6). The feed restriction period was from 90 days to 140 days of pregnancy. Results: The ewe’s body weight, liver weights, water, and protein content of liver in the restricted groups were reduced compared with the CG group (p<0.05), but the liver fat contents in the RG1 group were higher than those of the CG group (p<0.05). The increased hepatic collagen fibers and reticular fibers were observed in the restricted groups with the reduction of energy intake. The concentrations of nonesterified free fatty acids in the RG1 and RG2 groups were higher than those of the CG group with the reduction of energy intake (p<0.05), but there were decreased concentrations of lipoprotein lipase and hepatic lipase in both restricted groups compared with the CG group (p<0.05). In addition, the increased concentrations of β-hydroxybutyric acid, triglycerides, malondialdehyde, total antioxidant capacity and activities of superoxide dismutase activity and catalase were found in the RG1 group, and the concentrations of cholinesterase in the RG1 group were reduced compared with the CG group (p<0.05). For the concentrations of acute phase proteins, the C-reactive protein (CRP) in the RG1 group were reduced compared with the CG group, but there were no differences in haptoglobin relative to the controls (p>0.05). Conclusion: The fat accumulation, increased hepatic fibrosis, antioxidant imbalance and modified synthesis of acute phase proteins were induced in ewe’s liver by maternal malnutrition during late pregnancy, which were detrimental for liver function to accommodate pregnancy.
Wen-Xiao Chu,Rui Wang,CHI-CHUAN WANG 대한설비공학회 2019 International Journal of Air-Conditioning and Refr Vol.27 No.4
This paper experimentally investigates the effect of pressure resistance distribution by using perforated grilles with different porosities (F=100%, 58% and 35.4%) in a container data center. The inlet and outlet temperature distribution, rack cooling index (RCI) and supply heat index (SHI) are used to evaluate the cooling performance under semi-contained and fully contained configurations. As a result, the airflow reversal phenomenon at the top cabinets is found, which is especially conspicuous for the case without perforated grilles due to the extremely low pressure resistance in the cabinet. By implementing perforated grilles at lower three cabinets, the airflow reversal can be eliminated, however, it cannot be completely removed. By applying perforated grilles with F=35.4% at the top three cabinets can increase the pressure resistance at the cabinets S1 where the airflow reversal is eliminated thoroughly. Yet, the performance of cabinets at rack A1 may degrade rapidly due to much stronger hot-exhaust recirculation. Hence, the fully contained configuration is applied. Note that the airflow reversal is more severe for the case without perforated grilles. By arranging the perforated grilles with F = 35.4%, the corresponding RCI and SHI may reach the ideal values of 100% and zero, respectively. Therefore, the perforated grilles with F= 35.4% are more reasonable for simulated racks under semi-contained and fully contained configurations when airflow reversal occurs.
A novel illumination system design for application in the integrated screen 3D display
Chu-Hsun Lin,Chun-Chuan Lin,Hsin-Hsiang Lo,Shuang-Chao Chung,Tian-Yuan Chen,Chy-Lin Wang 한국정보디스플레이학회 2010 Journal of information display Vol.11 No.1
A mini-projector prototype employing a LED light source, a nontelecentric structure, and an LCOS panel for application in the integrated 3D display was fabricated. A seamless image was obtained by tilting an array of mini-projectors. Seamless quality was created by the excellent uniformity of the projection intensity on the mini-projector’s screen, which was simulated as 98.34%. Great uniformity can be realized by optimizing the design of the light source and the optics configuration, which is the key to such realization.