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| 1 | Combustion instability of pilot flame in a pilot bluff body stabilized combustor显示文摘Combustion instability of pilot flame has been investigated in a model pilot bluff body stabilized combustor by running the pilot flame only. The primary objectives are to investigate the pilot flame dynamics and to provide bases for the study of the interaction mechanisms between the pilot flame and the main flame. Dynamic pressures are measured by dynamic pressure transducers. A high speed camera with CH*bandpass filter is used to capture the pilot flame dynamics. The proper orthogonal decomposition(POD) is used to further analyze the high speed images. With the increase of the pilot fuel mass flow rate, the pilot flame changes from stable to unstable state gradually. The combustion instability frequency is 136 Hz when the pilot flame is unstable. Numerical simulation results show that the equivalence ratios in both the shear layer and the recirculation zone increase as the pilot fuel mass flow rate increases. The mechanism of the instability of the pilot flame can be attributed to the coupling between the second order acoustic mode and the unsteady heat release due to symmetric vortex shedding. These results illustrate that the pilot fuel mass flow rate has significant influences on the dynamic stability of the pilot flame. | Fu Xiao Yang Fujiang Guo Zhihui | 2015 | Chinese Journal of Aeronautics2015，28，6： | 5 |
| 2 | Overexpression of phospholipase Dα gene enhances drought and salt tolerance of Populus tomentosa显示文摘The cDNA of AtPLDα (Arabidopsis thaliana Phospholipase Dα) gene was introduced into P. tomentosa (Populus tomentosa) under the control of the Cauliflower mosaic virus 35S promoter. Southern and Northern blot analyses suggested that the AtPLDα gene has been transferred into the P. tomentosa genome. No obvious morphological or developmental difference was observed between the transgenic and wild-type (WT) plants. Drought and salt tolerance and gene expression of seedlings of several transgenic lines and WT plants (control) were studied. The results showed that the rhizogenesis rate and the average root-length of transgenic lines were significantly higher than WT plants after mannitol and NaCl treatment under the same growth conditions. Northern blot analysis indicated that the higher the PLDα expression in the transgenic plants, the more tolerant the transgenic plants are to drought and salt treatment. Meanwhile, another group of these transgenic lines and WT plants (control) were treated with PEG6000 and NaCl separately. The contents of chlorophylls and the activities of some anti-oxidant enzymes (superoxide dismutase, guaiacol peroxidase and catalase) as well as malondialde-hyde and relative electrical conductivity were analyzed. Altogether, our results demonstrated that overexpression of the PLDα gene can enhance the drought and salt tolerance in transgenic P. tomen-tosa plants. | ZHANG TingTing SONG YunZhi LIU YuDong GUO XingQi ZHU ChangXiang WEN FuJiang | 2008 | Chinese Science Bulletin2008，53，23： | 3 |
| 3 | Isolation of a strong matrix attachment region (MAR) and identification of its function in vitro and in vivo显示文摘Inclusion of MARs in transgene cassettes enhances their expression and reduces position-effect variations in the transgenic host. Four new MARs (TM2, TM3, AM1 and AM2) were isolated from tobacco and Arabidopsis by PCR method. The nuclei isolated from suspension-cultured cells of rice were used to prepare nuclear matrix. With a characterized MAR (TM1) as a positive control, the Matrix-MAR interactions were tested by an in vitro binding assay to identify the DNA sequences as MARs and their binding strength to nuclear matrix in vitro was compared. The results showed that TM2 and TM3 had stronger binding strength than TM1. To determine the functions of the four new MARs in vivo, binary vectors pBI121 carrying a uidA GUS reporter gene were modified with direct repeat MARs inserted on both sides of the reporter gene cassette and were transferred into tobaccos via Agrobacterium-mediated transformation procedure. Quantitative GUS assays of the transgenic tobaccos showed that when flanking a GUS reporter gene | Kewei Zhang Jianmei Wang Guodong Yang Xingqi Guo Fujiang Wen Decai Cui Chengchao Zheng | 2002 | Chinese Science Bulletin2002，47，23： | 2 |
| 4 | Research on the Relationship Between Garlic and Young GarlicShoot Based on Big Data显示文摘In view of the problems such as frequent fluctuation of garlic price, lack ofefficient forecasting means and difficulty in realizing the steady development of garlicindustry, combined with the current situation of garlic industry and the collected datainformation. Taking Big Data platform of garlic industry chain as the core, using themethods of correlation analysis, smoothness test, co-integration test, and Grangercausality test, this paper analyzes the correlation, dynamic, and causality between garlicprice and young garlic shoot price. According to the current situation of garlic industry,the garlic industry service based on Big Data is put forward. It is concluded that there is apositive correlation between garlic price and young garlic shoot price, and there is a longtermstable dynamic equilibrium relationship between young garlic shoot price and garlicprice fluctuation, and young garlic shoot price can affect garlic price. Finally, it isproposed to strengthen the infrastructure construction of garlic Big Data, increase thetechnological innovation and application of garlic Big Data technology, and promote thesafety and security ability of the whole industry to promote the development of garlicindustry. | Feng Guo Pingzeng Liu Wanming Ren Ning Cao Chao Zhang Fujiang Wen Helen Min Zhou | 2019 | Computers, Materials & Continua2019，，2： | 1 |
| 5 | Advances in studying of the pharmacological activities and structure–activity relationships of natural C-glycosylflavonoids显示文摘C-glycosylflavonoids are characterized by a bond between the anomeric carbon of a sugar moiety and the C-6 or C-8 position of a flavonoid A ring.These compounds are widespread in nature and have become the subject of increasing research interest due to their high biological potential.This review focuses on the biological effects of various C-glycosylflavonoids and their structure–activity relationships(SAR)as elucidated over the last 5 years. | Peng Zeng Yong Zhang Chen Pan Qi Jia Fujiang Guo Yiming Li Weiliang Zhu Kaixian Chen | 2013 | Acta Pharmaceutica Sinica B2013，3，3： | 0 |
| 6 | Changes in the Water Area of Chahannaoer and Its Influencing Factors from 1986 to 2020显示文摘Based on the long-term Landsat remote sensing data,the dynamic changes in the water area of Chahannaoer from 1986 to 2020 were analyzed,and the influencing factors of lake changes were analyzed combined with meteorological data and human factors.The results show that in the past 35 years,the water area of Chahannaoer tended to reduce obviously on the whole;annual average evaporation and annual average relative humidity gradually decreased,and annual average temperature,annual average precipitation,and annual average wind speed increased.Precipitation and relative humidity were significantly positively correlated with water area;temperature and average wind speed were negatively correlated with water area,but the correlation was not significant;there was a weak correlation between evaporation and water area.Precipitation and relative humidity were the main climatic factors affecting the change of water area in Chahannaoer. | Nan ZHAO Yan HUANG Ruiqi YAN Xiaoli GUO Dan ZHANG Fujiang REN | 2022 | Meteorological and Environmental Research2022，13，1： | 0 |
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