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- 저자 : Mingliang-Zheng (검색결과 6 건)
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The Moisture Content and Temperature Variation in Contact Drying Process of Paper
Zheng Mingliang 한국펄프·종이공학회 2019 펄프.종이기술 Vol.51 No.5
In order to reveal the change law of moisture content and temperature in drying technology of cylinder, then guiding the design of drying structure and reducing energy consumption. Based on the principle of conservation of mass, this paper establishes a mathematical model for the evaporation of held water at dry end during the contact drying process of paper; The analytical formula of water content is obtained by combining the fixed conditions; The effects of initial moisture content (initial dryness), air velocity and heat source temperature on moisture content and paper temperature in drying process are simulated. The results show that the size of parameters do not change the overall exponential decay trend of evaporation law, but they change the slope of attenuation in the decline stage of drying process. The initial moisture content is smaller, the absolute value of curve descending slope is greater, but the time needed for drying is longer; The air velocity is larger, the absolute value of curve descending slope is greater, and the time is shorter; The heat source temperature is higher, the drying rate is bigger, the time is shorter, the theoretical analysis is in line with the actual production process.
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The Model and Experiment for Heat Transfer Characteristics of Nanoporous Silica Aerogel
Mingliang, Zheng Materials Research Society of Korea 2020 한국재료학회지 Vol.30 No.4
Nanoporous silica aerogel insulation material is both lightweight and efficient; it has important value in the fields of aerospace, petrochemicals, electric metallurgy, shipbuilding, precision instruments, and so on. A theoretical calculation model and experimental measurement of equivalent thermal conductivity for nanoporous silica aerogel insulation material are introduced in this paper. The heat transfer characteristics and thermal insulation principle of aerogel nano are analyzed. The methods of SiO<sub>2</sub> aerogel production are compared. The pressure range of SiO<sub>2</sub> aerogel is 1Pa-atmospheric pressure; the temperature range is room temperature-900K. The pore diameter range of particle SiO<sub>2</sub> aerogel is about 5 to 100 nm, and the average pore diameter range of about 20 ~ 40 nm. These results show that experimental measurements are in good agreement with theoretical calculation values. For nanoporous silica aerogel insulation material, the heat transfer calculation method suitable for nanotechnology can precisely calculate the equivalent thermal conductivity of aerogel nano insulation materials. The network structure is the reason why the thermal conductivity of the aerogel is very low. Heat transfer of materials is mainly realized by convection, radiation, and heat transfer. Therefore, the thermal conductivity of the heat transfer path in aerogel can be reduced by nanotechnology.
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miR-122 promotes diabetic retinopathy through targeting TIMP3
Wang Mingliang,Zheng Huifen,Zhou Xianbo,Zhang Jiwei,Shao Guanghui 한국통합생물학회 2020 Animal cells and systems Vol.24 No.5
Diabetic retinopathy (DR) is a primary complication of diabetes mellitus. DR can cause severe vision loss for patients. miR-122 is elevated in DR patients, while its role in DR is unclear. Hence, the purpose of this study was to analyze the effect of miR-122 on the function of high glucoseinduced REC cells and the underlying molecular mechanisms. In this study, our results revealed that miR-122 was up-regulated in high glucose-induced human retinal pigment epithelial cells (ARPE-19). High glucose decreased the cell viability of ARPE-19 cells, which was then restored by miR-122 knockdown. In addition, miR-122 knockdown suppressed apoptosis of high glucoseinduced ARPE-19 cells. High glucose also inhibited B-cell lymphoma-2 (Bcl-2) level and increased cleaved caspase-3 level in ARPE-19 cells, which were reversed by miR-122 knockdown. Tissue inhibitor of metalloproteinases-3 (TIMP3) was a direct target of miR-122. TIMP3 was decreased in high glucose-induced ARPE-19 cells, and the decrease was abrogated by miR-122 knockdown. In addition, the effects of miR-122 overexpression in cell viability and apoptosis of high glucoseinduced ARPE-19 were abolished by overexpression of TIMP3. In conclusion, the effect and mechanism of miR-122 on high glucose-induced ARPE-19 cells were demonstrated for the first time. miR-122 promoted diabetic retinopathy through targeting TIMP3, making miR-122 a promising target for diabetic retinopathy therapy.
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Gao Jie,Zheng Mingliang 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.10
It aims at group incentive and alliance scale of collaborative logistics alliance. It defines the connotation of collaborative logistics alliance based on theories related to domestic and overseas logistics alliance and it establishes group incentive model under single alliance leader and multiple alliance leaders based on double layer principal-agent theory. Solution shows that, in group incentive model of logistics alliance, incentive coefficient under one alliance leader enterprise is the same as that under alliance leader decision-making system containing several enterprises. Group scale of logistics alliance can be determined when certainty equivalent wealth of alliance leader decision-making system and alliance member enterprise is equal to their respective retained income.
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Gao Jie,Zheng Mingliang 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.8
This paper takes Weifang, where ecological advantage is relatively stronger than other regions in Jiaodong peninsula, as an example and establishes an index system for environmental effect evaluation of agricultural production activities in order to conduct quantitative research on the relationship between agricultural production activities and environment. Firstly, indexes are chosen under PSR framework, then extension analytic hierarchy process (AHP) is used to calculate extension interval judgment matrix on the basis of expert scoring. Calculation result is weight vectors that meet with consistency conditions and single hierarchical arrangement is practiced. The normalized results of single hierarchical arrangement are weight vectors of indexes of different hierarchies. The index system helps to formulate policies for sustainable development of economy, society and ecology, industrial restructuring and conservation and rehabilitation of ecological environment in Jiaodong peninsula.
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