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Search Results: 1 - 10 of 76898 matches for " DONG Yan-ying "
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A cold 87Rb atomic beam

Wang Xiao-Ji,Feng Yan-Ying,Xue Hong-Bo,Zhou Zhao-Ying,Zhang Wen-Dong,

中国物理 B , 2011,
Abstract: We demonstrate an experimental setup for the production of a beam source of cold 87Rb atoms. The atoms are extracted from a trapped cold atomic cloud in an unbalanced three-dimensional magneto-optical trap. Via a radiation pressure difference generated by a specially designed leak tunnel along one trapping laser beam, the atoms are pushed out continuously with low velocities and a high flux. The most-probable velocity in the beam is varied from 9 m/s to 19 m/s by varying the detuning of the trapping laser beams in the magneto-optical trap and the flux can be tuned up to 4×109 s-1 by increasing the intensity of the trapping beams. We also present a simple model for describing the dependence of the beam performance on the magneto-optical trap trapping laser intensity and the detuning.
Seasonal Variation of Water Quality and Phytoplankton Response Patterns in Daya Bay, China
Cui-Ci Sun,You-Shao Wang,Mei-Lin Wu,Jun-De Dong,Yu-Tu Wang,Fu-Lin Sun,Yan-Ying Zhang
International Journal of Environmental Research and Public Health , 2011, DOI: 10.3390/ijerph8072951
Abstract: Data collected from 12 stations in Daya Bay in different seasons in 2002 revealed the relation between water quality and phytoplankton response patterns. The results showed that Daya Bay could be divided into wet and dry seasons by multivariate statistical analysis. Principal component analysis indicated that temperature, chlorophyll a and nutrients were important components during the wet season (summer and autumn). The salinity and dissolved oxygen were the main environmental factors in the dry season (winter and spring). According to non-metric multidimensional scaling, there was a shift from the large diatoms in the dry season to the smaller line-chain taxa in the wet season with the condition of a high dissolved inorganic nitrogen and nitrogen to phosphorous concentration ratio. Nutrient changes can thus alter the phytoplankton community composition and biomass, especially near the aquaculture farm areas. There was no evidence of an effect of thermal water from the nearby nuclear power plants on the observed changes in phytoplankton community and biomass in 2002.
Chemometry use in the evaluation of the sanya bay water quality
Dong, Jun-De;Zhang, Yan-Ying;Shao Wang, You;Wu, Mei-Lin;Zhang, Si;Cai, Chuang-Hua;
Brazilian Journal of Oceanography , 2010, DOI: 10.1590/S1679-87592010000400008
Abstract: in this study, chemometric method is employed to identify anthropogenic effects on the water quality in sanya bay, south china sea, and its marine and natural characteristics. principal component analysis has extracted the four latent factors, thus explaining 85.52% of the total variance. cluster analysis and principal component analysis have identified three different patterns of water quality based on anthropogenic effects and marine characteristics: cluster i located in the outer and middle parts of the bay, cluster ii close to downtown sanya, cluster iii located in the sanya river estuary. in terms of the temporal pattern, principal component analysis and cluster analysis have distinguished the dry season from november to the following april, and the rainy season from may to october. the temporal pattern is related to climate and natural characteristics. the similarity index between variables and scores of samples can further distinguish the contribution of the variables to the samples. both the polluting sources external to the sanya river and the water from the south china sea exercise an important influence on the water quality in sanya bay. these results may be valuable for socioeconomic development and human health in the sanya bay area.
Prospects for the 21 Century in Geological Sciences ——Enlightenment from the 31th International Geological Congress 2000

DONG Shu-wen,ZHAO Xun,ZHANG Yan-ying,WU Jin-guo,

地球学报 , 2001,
Abstract: The 31th Session of the International Geological Congress-31th IGC-held in Rio de Janeiro, Brazil, from August 6 to 17 of 2000. About 3 705 geologists from 103 countries and areas are attended this Congress. The theme of the 31th IGC is Geology and Sutainable Development: Challenges for the Third Millennium. More then 180 geologists consisting China delegation are presented and jointed exchange in different fields and subjects during the IGC. Fortunately, authors followed the China delegation to Rio de Janeiro, and here would like to talk on the development tendency and facing challenge of geological sciences in 21 century according to our feeling and exchange date for discussion with our colleagues. This paper mentioned briefly the development features during past 100 years and emphasized the technology play an important role in pushing progression of geological sciences; offer some tasks facing new century of geological sciences as following as: supply mineral resources sutainablly, shortage of water resources, reducing nature hazards and service society and police.
Question classification based on self-learning rules and modified Bayes

TIAN Wei-dong,GAO Yan-ying,ZU Yong-liang,

计算机应用研究 , 2010,
Abstract: According to the Chinese question, this paper presented a question classification method which combined self-learning rules, consisting of question word-category rules and question word+head word-category rules established in advance by the self-learning method, and modified Bayesian model to improve Chinese question classification. At last, combined modified Bayesian model to improve question classification. The method takes advantage of the contribution of key words to Chinese question classification. Experimental results show that this classification method is a considerable improvement, and accuracy rate a chieves 84%.
Application of on-line quality control for salvianolic acid B by near infrared spectroscopy  [PDF]
Jin-Wei Zhang, Yan Liu, Wei-Wei Liu, Yan-Ying Zhang
Health (Health) , 2009, DOI: 10.4236/health.2009.13040
Abstract: OBJECTIVE: To study and establish quality con-trol model of the Salvianolic Acid B by Near In-frared Spectroscopy (NIRS), and to realize on-line quality control of extracting and purifying proc-esses of industrial scale herbal product manu-facturing. METHOD: NIR chromatography was obtained from on-line NIR detection of extract-ing process and purifying process. HPLC analysis was carried out to determine the con-tents of salvianolic acid B. Partial Least Squares Regression (PLS) was used to establish the model between the information between NIRS and HPLC. RESULTS: For extracting model: the optimum Near Infrared (NIR) wavelength range was 9815- 5430cm-1, R=0.9784, RMSEC=0.258; for puri-fying model: the optimum NIR wavelength range was 9815-5430cm-1, R=0.9776, RMSEC=4.02. The average relative error was <5%. CONCLUSION: NIR technique is applicable for on-line quality control in production of salvianolic acid B.
DNA-dependent protein kinase catalytic subunit modulates the stability of c-Myc oncoprotein
Jing An, Dong-Yan Yang, Qin-Zhi Xu, Shi-Meng Zhang, Yan-Ying Huo, Zeng-Fu Shang, Yu Wang, De-Chang Wu, Ping-Kun Zhou
Molecular Cancer , 2008, DOI: 10.1186/1476-4598-7-32
Abstract: Firstly, siRNA-mediated silencing of DNA-PKcs strikingly downregulated c-Myc protein levels in HeLa and HepG2 cells, and simultaneously decreased cell proliferation. The c-Myc protein level in DNA-PKcs deficient human glioma M059J cells was also found much lower than that in DNA-PKcs efficient M059K cells. ATM deficiency does not affect c-Myc expression level. Silencing of DNA-PKcs in HeLa cells resulted in a decreased stability of c-Myc protein, which was associated the increasing of c-Myc phosphorylation on Thr58/Ser62 and ubiquitination level. Phosphorylation of Akt on Ser473, a substrate of DNA-PKcs was found decreased in DNA-PKcs deficient cells. As the consequence, the phosphorylation of GSK3 β on Ser9, a negatively regulated target of Akt, was also decreased, and which led to activation of GSK 3β and in turn phosphorylation of c-Myc on Thr58. Moreover, inhibition of GSK3 activity by LiCl or specific siRNA molecules rescued the downregulation of c-Myc mediated by silencing DNA-PKcs. Consistent with this depressed DNA-PKcs cell model, overexpressing DNA-PKcs in normal human liver L02 cells, by sub-chronically exposing to very low dose of carcinogen 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), increased c-Myc protein level, the phosphorylation of Akt and GSK3 β, as well as cell proliferation. siRNA-mediated silencing of DNA-PKcs in this cell model reversed above alterations to the original levels of L02 cells.A suitable DNA-PKcs level in cells is necessary for maintaining genomic stability, while abnormal overexpression of DNA-PKcs may contribute to cell proliferation and even oncogenic transformation by stabilizing the c-Myc oncoprotein via at least the Akt/GSK3 pathway. Our results suggest DNA-PKcs a novel biological role beyond its DNA repair function.The c-Myc oncoprotein is a short-lived basic helix-loop-helix leucine-zipper transcription factor that, together with its dimerization partner Max, binds to specific E-box sequences and is responsible for control
Isolation and Characterization of a N2-fixing Bacterium from Coral Reef-seagrass Ecosystem

LING Juan,DONG Jun-De,ZHANG Yan-Ying,CAI Chuang-Hu,WANG You-Shao,ZHANG Si,

微生物学通报 , 2010,
Abstract: 三亚珊瑚礁自然保护区部分珊瑚礁退化后逐渐演替为以泰来藻(Thalassia hemprichii)为优势种的海草床群落, 采用选择性无氮培养基从泰来藻植株的根际, 分离得到一株固氮菌, 编号为G33-1, 经形态学、生理生化鉴定和16S rDNA及固氮基因nifH的序列分析, 初步鉴定为成团泛菌(Pantoea agglomerans)。该菌为革兰氏阴性菌, 以周生鞭毛运动, 呈直杆状, 菌落圆形, 半透明乳白色, 比较湿润, 有光泽, 直径约1 mm, 低凸, 光滑, 边缘比较整齐。最适培养条件为: 氯化钠浓度25‰, 生长温度为37°C, 起始pH值为8。与成团泛菌标准菌株(ATCC27155TM) 相比较, 在碳源利用、精氨酸双水解、苯丙氨酸脱胺酶、鸟氨酸脱胺酶、以及生长温度和盐度等方面都具有较高的相似性, 以16S rDNA为基础构建的系统进化树分析结果, 表明其与成团泛菌属Pantoea agglomerans WAB1870进化距离最近, 相似性大于99%。此外, 利用乙炔还原法对固氮活性进行测定, 其具有较高的固氮活性, 达299.16 nmol C2H2/(mL·h)。
Research on Data Integration for Engineering Test

YANG Yan-ying,WANG Chuan-dong,HUANG Zhi-qiu,SHEN Guo-hu,ZHANG Jiang-tao,

计算机应用研究 , 2005,
Abstract: Proposes to describe data information in the CAPP system by XML technique. CAPP system has good extensibility and flexibility with relational database storage method. The integrate capability of manufacturing information system is im-proved.
Assemblies and Properties of Asymmetric Supercapacitors Based on WO3/Carbon Cloth

SHAO Wen-ke
, ZHAO Lei, LIU Chao, DONG Yan-ying, ZHU Yuan-jie, WANG Qiu-fan

- , 2018, DOI: 10.13208/j.electrochem.180124
Abstract: 摘要 以超级电容器的电极材料制备、性质研究及对组装的非对称超级电容器的性能研究为核心内容,提高超级电容器电化学性能为主要目的,采用水热合成法在碳布基底上合成三氧化钨/碳布和活化后的碳布为超级电容器的电极材料。采用SEM、XRD表征方法对制备的材料进行了形貌表征及物相分析;使用上海辰华电化学工作站对电极材料进行了循环伏安、恒流充放电、交流阻抗等电化学性能测试. 最终得到以三氧化钨/碳布为正极材料、活化后的碳布为负极材料组装成不对称柔性电容器,进行电化学测试,其电位窗口提高到0~1.6 V,电流密度61.9 mA·cm-2时,电容达到58.96 F·cm-2,功率密度0.48 W·cm-2时,能量密度为20.36 mWh·cm-2,同时在电流密度8 mA·cm-2时,循环3000次时表现出良好的循环性能,相较于对称型超级电容器,倍率性能更加优异
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