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- 저자 : Qi ZHOU (검색결과 253 건)
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Research on China's Steel Demand Using Combined Forecast
Yuyan Weng,Li Zhou,Sheng Zhou,Tianyu Qi 보안공학연구지원센터(IJUNESST) 2015 International Journal of u- and e- Service, Scienc Vol.8 No.1
This research conducts an error analysis between the forecasting value and the actual value of steel demand of 2010 in China, which is based on the analysis of forecasting methods and their results of Chinese steel demand in the existing studies, and then forecasts China’s steel demand in 2015 by making use of a combined forecasting method. The combined forecasting method includes two stages. In the first stage, with reference to actual steel demand of China in 2010, a threshold is set and some forecasting results are selected according to the error between the forecasting value and actual value of steel demand of each method. In the second stage, weights of corresponding selected methods are determined which are based on the error. And the final demand of China’s steel in 2015 is forecasted through the combined forecasting method.
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Zhou, Qi,Zang, Shizhu,Zhao, Zinan,Li, Xinli 한국식품과학회 2018 Food Science and Biotechnology Vol.27 No.1
Northeastern Chinese sauerkraut is a well-known traditional fermented vegetable in China. Incomplete identification of the microorganisms' (bacteria in spontaneous fermentation) diversity and accumulation of nitrite make it difficult to normalize the fermentation process and product qualities of northeastern Chinese sauerkraut. Conventional culturing and polymerase chain reaction-denaturing gradient gel electrophoresis methods were combined to describe microbial structure and diversity. Lactobacillus, Leuconostoc, Enterobacter, Accumulibacter, Thermotoga, Pseudomonas, Clostridium, Rahnella and Citrobacter were predominant microorganisms in different fermentation periods. The pH value and nitrite concentration presented a certain relevance to the amount of lactic acid bacteria. Lactobacillus and Leuconostoc had the ability to decrease nitrite by inhibiting nitrate-reducing bacteria such as Enterobacter. Therefore, Northeastern Chinese sauerkraut should not be eaten until 4 weeks of fermentation for the safety and quality of fermented foods. Northeastern Chinese sauerkraut is rich in lactic acid bacteria, which demonstrate its ability as an excellent probiotic for applications in functional foods.
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Recent advances of bioactive proteins/polypeptides in the treatment of breast cancer
Qi-Zhang Li,Ze-Rong Zhou,Cui-Yu Hu,Xian-Bin Li,Yu-Zhou Chang,Yan Liu,Yu-Liang Wang,Xuan-Wei Zhou 한국식품과학회 2023 Food Science and Biotechnology Vol.32 No.3
Proteins do not only serve as nutrients to fulfill the demand for food, but also are used as a source of bioactive proteins/polypeptides for regulating physical functions and promoting physical health. Female breast cancer has the highest incidence in the world and is a serious threat to women’s health. Bioactive proteins/polypeptides exert strong anti-tumor effects and exhibit inhibition of multiple breast cancer cells. This review discussed the suppressing effects of bioactive proteins/polypeptides on breast cancer in vitro and in vivo, and their mechanisms of migration and invasion inhibition, apoptosis induction, and cell cycle arrest. This may contribute to providing a basis for the development of bioactive proteins/polypeptides for the treatment of breast cancer.
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Zhou Yong,Dong Qi,Niu Xiao-Jun,Xu Hong,Xiong Qi,Su Hao,Zheng Jun 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.6
A 2 MW direct-drive (DD) high temperature superconducting (HTS) wind power generator with HTS wires in the rotor fi eld windings and copper transposed conductor in the stator coils was explored for the wind turbine application in this study. An oil-cooling air-core stator with non-magnetic teeth of the 2 MW DD HTS generator was designed because the high fl ux density generated by the HTS wires wound result in larger dissipation in iron teeth, and the process of that could be summarized as follows. First, a 2 MW DD HTS wind power generator was designed, and the electromagnetic (EM), loss, EM force, and insulation of the DD HTS generator were analyzed and developed, respectively. Second, the thermal and mechanical of the one pole pair oil-cooling air-gap armature was analyzed by the fi nite element analysis. Then, a pole pair segment of the oil-cooling air-core stator with the same structure as the 2 MW generator was designed and manufactured to identify potential challenges, obtain practical knowledge before production, and then reduce the development risk of the 2 MW DD HTS generator. Furthermore, a test system with converter, oil-cooling system, and data acquisition equipment was developed simultaneously to test the temperature distribution of the slotless stator. The performance test results show that the maximum temperature rise of the one pole pair oil-cooling stator under rated conditions is about 81.4 K, which satisfi es the design requirements of the 2 MW DD HTS generator.
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Qi Zhou,Shizhu Zang,Zinan Zhao,Xinli Li 한국식품과학회 2018 Food Science and Biotechnology Vol.27 No.1
Northeastern Chinese sauerkraut is a wellknown traditional fermented vegetable in China. Incomplete identification of the microorganisms’ (bacteria in spontaneous fermentation) diversity and accumulation of nitrite make it difficult to normalize the fermentation process and product qualities of northeastern Chinese sauerkraut. Conventional culturing and polymerase chain reaction-denaturing gradient gel electrophoresis methods were combined to describe microbial structure and diversity. Lactobacillus, Leuconostoc, Enterobacter, Accumulibacter, Thermotoga, Pseudomonas, Clostridium, Rahnella and Citrobacter were predominant microorganisms in different fermentation periods. The pH value and nitrite concentration presented a certain relevance to the amount of lactic acid bacteria. Lactobacillus and Leuconostoc had the ability to decrease nitrite by inhibiting nitrate-reducing bacteria such as Enterobacter. Therefore, Northeastern Chinese sauerkraut should not be eaten until 4 weeks of fermentation for the safety and quality of fermented foods. Northeastern Chinese sauerkraut is rich in lactic acid bacteria, which demonstrate its ability as an excellent probiotic for applications in functional foods.
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Qi Zhou,Liangtao Zhao,Zhe Chen 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.6
In the current standards, wind loads on lattice transmission tower (LTT) bodies only account for the action of horizontal winds, which may not be suitable for an LTT under the action of extreme winds. The wind load coefficients of LTT bodies subjected the skewed wind with both horizontal and vertical components were measured via several well-designed wind tunnel tests. The test results and standard calculations of the skewed wind load factors (SWLF) at a wind attack angle of 0° were compared and analyzed. A new parameter—combined wind load factor (CWLF) was introduced, and a suggested formula is proposed for it. The results showed that the standard-recommended formula was unable to accurately reflect the characteristics of SWLF, and its calculated results were significantly smaller than the test results, indicating that the actual wind loads were underestimated. The CWLF could correctly describe how wind load factors changed with the yaw angles or the attack angles. The CWLF effectively improved the calculation accuracy of the SWLF, and the absolute error between the calculations and test results under the critical yaw and attack angles was less than 7%.
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Zhou, Qi,Jiang, Jue,Shang, Xu,Zhang, Hong-Li,Ma, Wen-Qi,Xu, Yong-Bo,Wang, Hua,Li, Miao Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.17
Background: The purpose of this study was to investigate the correlation of contrast-enhanced ultrasonographic (CEUS) features with microvessel density (MVD) in papillary thyroid carcinomas (PTCs). Materials and Methods: Contrast-enhanced ultrasonography (CEUS) was performed in 62 patients (17 men and 45 women) with PTC. Tomtec software was applied to analyze the time intensity curve of CEUS. Immunohistochemistry was performed to evaluate the level of MVD in papillary thyroid carcinoma. Then the relationship between quantitative feature and the level of MVD was analyzed using SPSS 16.0 software. Results: The mean peak intensity of PTC tissues was lower than that of peripheral thyroid parenchyma ($61.9{\pm}11.8%$ vs 100%, p<0.05). The MVDs of CD34 and CD31 antibodies staining were $38.0{\pm}6.1$ and $37.9{\pm}5.1$ respectively in 62 PTC samples. A significantly positive correlation was observed between peak intensity and MVD in PTC tissues ($P_{CD34}$<0.01, $r_{CD34}$=0.838, $P_{CD31}$<0.01, $r_{CD31}$=0.837). Conclusions: The peak intensity in CEUS could reflect the MVD in PTC tissues. Therefore, quantification of CEUS seems to be helpful for assessment of MVD in PTC tissues.
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Tradeoff Control of Multi-exposure Lithography for SU-8 Photochemical Reaction Channel Formation
Qi-Ming Chen,Jin-Yun Zhou,Yi-Ming Hu,Qi Zheng 한국바이오칩학회 2020 BioChip Journal Vol.14 No.4
A method involving multi-exposure with low-power is presented to fabricate an SU-8 mold based on a digital micromirror device (DMD) maskless lithography with an LED source at a wavelength of 405 nm. The SU-8 mold is used for the fabrication of a PDMS concentration gradient generator (CGG). During a one-time exposure, it is easy to over-expose at the top and under-expose at the bottom of a thick SU-8, which then forms a T-shaped structure. This is more obvious for high-absorption coefficients such as 365 nm. We found that by taking advantage of the partially absorbed and partially transmissive characteristics of the 405-nm wavelength, multi-exposure can form an effective photochemical reaction channel in SU-8 and can solve the problem mentioned above. However, excessive exposure will cause the linewidth to increase, therefore, it is necessary to find a tradeoff for the number of multi-exposure times. For a 55-μm thick SU-8, the tradeoff threshold is found to be 25. Three types of SU-8 CGG molds were fabricated at this threshold. The results indicate that the actual profile of the SU-8 mold shows good agreement with the design profile without any T-shaped structures.
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Investigation on spanwise coherence of buffeting forces acting on bridges with bluff body decks
qi zhou,Le-Dong Zhu,Chuangliang Zhao,Pengjie Ren 한국풍공학회 2020 Wind and Structures, An International Journal (WAS Vol.30 No.2
In the traditional buffeting response analysis method, the spanwise incomplete correlation of buffeting forces is always assumed to be same as that of the incident wind turbulence and the action of the signature turbulence is ignored. In this paper, three typical bridge decks usually adopted in the real bridge engineering, a single flat box deck, a central slotted box deck and a two-separated paralleled box deck, were employed as the investigated objects. The wind induced pressure on these bridge decks were measured via a series of wind tunnel pressure tests of the sectional models. The influences of the wind speed in the tests, the angle of attack, the turbulence intensity and the characteristic distance were taken into account and discussed. The spanwise root coherence of buffeting forces was also compared with that of the incidence turbulence. The signature turbulence effect on the spanwise root coherence function was decomposed and explained by a new empirical method with a double-variable model. Finally, the formula of a sum of rational fractions that accounted for the signature turbulence effect was proposed in order to fit the results of the spanwise root coherence function. The results show that, the spanwise root coherence of the drag force agrees with that of incidence turbulence in some range of the reduced frequency but disagree in the mostly reduced frequency. The spanwise root coherence of the lift force and the torsional moment is much larger than that of the incidence turbulence. The influences of the wind speed and the angle of attack are slight, and they can be ignored in the wind tunnel test. The spanwise coherence function often involves several narrow peaks due to the signature turbulence effect in the high reduced frequency zone. The spanwise coherence function is related to the spanwise separation distance and the spanwise integral length scales, and the signature turbulence effect is related to the deck-width-related reduced frequency.
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