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Search Results: 1 - 10 of 12685 matches for " Qingqiang Yao "
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Application of Capillary Electrophoretic On-Line Sequential Concentration Based on Micelle to Solvent Stacking  [PDF]
Shan Sun, Yuanqi Lu, Zhe Yuan, Qingqiang Yao
American Journal of Analytical Chemistry (AJAC) , 2018, DOI: 10.4236/ajac.2018.91005
Abstract: To take advantage of micelle to solvent stacking (MSS) to achieve more sensitivity enhancement with enough selectivity, the application of capillary electrophoretic online sequential concentration based on the MSS was reviewed. MSS has been coupled to sweeping FASS, FASI and normal EKI. Furthermore, multiple stacking by coupling MSS with more than one stacking method has also been reported. It is more sensitive and selective than solely used of one or two stacking methods and is very suitable for complex and trace sample analysis.
Stage characteristics for the development of late Quaternary paleosols in the Yangtze Delta area
Qingqiang Chen,Congxian Li
Chinese Science Bulletin , 1999, DOI: 10.1007/BF02885037
Abstract: The late Quaternary paleosols in the Yangtze Delta area developed in the period of 25 000–12 000 aBP. Phytolith ratios (value A) of contents of fan, square and rectangle types indicating the warm and humid climate to those of bar, hat and point types indicating cold and dry climates decrease upwards overall on profiles of the paleosols, suggesting that the climates turned from warm and humid to cold and dry. So, the paleosols developed mainly during the regression before the last glacial maximum. Changes of value A indicate no trend of warming, suggesting that the transgression was rapid after the last glacial maximum. The development of the paleosols exhibited obvious stages, which were controlled remarkably by transgression and regression: I. Period of alternation of deposition and pedogenesis, which was from the occurrence of regresson before the last glacial maximum to the time when sea levels fell close to the lowest; II. Exposure period with continual pedogenesis, which was terminated when the paleosols were drown in the post-glacial transgression; III. Period of being drown and buried, the paleosols were buried by marine sediments, and reworked by early diagenesis.
General Research on Image Segmentation Algorithms
Qingqiang Yang,Wenxiong Kang
International Journal of Image, Graphics and Signal Processing , 2009,
Abstract: As one of the fundamental approaches of digital image processing, image segmentation is the premise of feature extraction and pattern recognition. This paper enumerates and reviews main image segmentation algorithms, then presents basic evaluation methods for them, and finally discusses the prospect of image segmentation. Some valuable characteristics of image segmentation come out based on a large number of comparative experiments.
Stage characteristics for the development of late Quaternary paleosols in the Yangtze Delta area

Qingqiang Chen,Congxian Li,

科学通报(英文版) , 1999,
Abstract: The late Quaternary paleosols in the Yangtze Delta area developed in the period of 25 000–12 000 aBP. Phytolith ratios (value A) of contents of fan, square and rectangle types indicating the warm and humid climate to those of bar, hat and point types indicating cold and dry climates decrease upwards overall on profiles of the paleosols, suggesting that the climates turned from warm and humid to cold and dry. So, the paleosols developed mainly during the regression before the last glacial maximum. Changes of value A indicate no trend of warming, suggesting that the transgression was rapid after the last glacial maximum. The development of the paleosols exhibited obvious stages, which were controlled remarkably by transgression and regression: I. Period of alternation of deposition and pedogenesis, which was from the occurrence of regresson before the last glacial maximum to the time when sea levels fell close to the lowest; II. Exposure period with continual pedogenesis, which was terminated when the paleosols were drown in the post-glacial transgression; III. Period of being drown and buried, the paleosols were buried by marine sediments, and reworked by early diagenesis.
Relationship between magnetic fabric parameters and dynamic characteristics of deposits in different environments
Qingqiang Chen,Congxian Li,Youzi Cong
Chinese Science Bulletin , 1998, DOI: 10.1007/BF02883472
Abstract: Comparison of magnetic fabric parameters of deposits in different modern sedimentary environments indicates that values ofP, F andL of eolian deposits are lower obviously than those of hydrogenic ones respectively. On relationship diagrams of magnetic fabric parameters, data points of eolian samples concentrated in limited area near origin of coordinates indicate that dynamic intensity is lower with less variation; while those of hydrogenic ones depart from origin of coordinates suggest higher intensity of sedimentary dynamics. Analyses of dynamic characteristics of different sedimentary environments indicate that values of magnetic fabric parameters of deposits are determined by dynamic types and characteristics of depositional processes. Magnetic fabric analyses of deposits are effective in determination of sedimentary environments.
Paleovalley in the Yannan-Sancang area of Jiangsu Province and its geological significance
Congxian Li,Minghao Wan,Qingqiang Chen
Chinese Science Bulletin , 1997, DOI: 10.1007/BF02882549
Abstract:
A Study on the Specification of WS-CAF
WS_CAF标准规范体系研究*

Wu Qingqiang,
吴清强

现代图书情报技术 , 2007,
Abstract: 从WS-CAF标准规范体系在数字图书馆集成服务描述标准规范中所处的重要性出发,对其产生的背景及其基本技术框架进行规范体系研究。并在规范体系研究的基础上,对WS—CAF在数字图书馆领域中的推广应用进行分析和提出建议。最后提出本文的不足之处以及后续研究的内容。
Paleovalley in the Yannan-Sancang area of Jiangsu Province and its geological significance

Li Congxian,Wan Minghao,Chen Qingqiang,

科学通报(英文版) , 1997,
Abstract:
Study on Cellulase Gene Expressed in Pichia pastoris and Analyses of Its Biochemical Characters  [PDF]
Min Lu, Juan Chang, Ping Wang, Qingqiang Yin, Xiaowei Dang, Tianzeng Gao, Fushan Lu
Journal of Materials Science and Chemical Engineering (MSCE) , 2018, DOI: 10.4236/msce.2018.67006
Abstract:
Objectives: In order to increase cellulose degradation, cellulase was expressed in this study. Literature Review: Cellulose is the most abundant organic carbon source on Earth; its enzymatic hydrolysis will be very useful for bioenergy production and resource recycling. Methods: Cellobiohydrlase I (CBH I) gene was amplified from genomic DNA of Trichoderma koningii and inserted into pGAPZα A plasmid to construct the vector of pGAPZαA-CBH I. It was linearized and transformed into Pichia pastoris by electroporation. The recombinant Pichia pastoris was selected and incubated with YPD medium for cellulase secretion. Results: The result showed that CMCase and avicelase activity in the supernatant was 1.1798 U/mL and 0.1276 U/mL, the molecular weight of the expressed protein was 53 kDa determined with SDS-PAGE analyses, and the optimal temperature and pH of the expressed cellulase were 45?C - 50?C and 4.5 - 5.0, respectively. Conclusion: Cellulase gene from T. koningii has been successfully cloned and expressed in Pichia pastoris.
Magnetic fabric characteristics of late Quaternary strata in Shanghai area
Daidu Fan,Qingqiang Cheng,Youzi Cong,Congxian Li
Chinese Science Bulletin , 1998, DOI: 10.1007/BF02883453
Abstract: The result of measurements and analyses on magnetic fabrics data for the late Quaternary core at Caoyangxincun in Shanghai shows that abrupt changes of magnetic fabric curves coincide with the boundaries between the marine strata and underlying stiff clay. Littoral, neritic, subtidal and tidal flat facies in the marine strata have distinct magnetic fabric characteristics. The curves of the parameters,K, P, L, q, display clear boundaries between various facies, which could serve as a new method for the stratigraphic subdivision and correlation.
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