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Search Results: 1 - 10 of 59025 matches for " Shufeng Yang "
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Fast Determination of Vitamin B2 Based on Molecularly Imprinted Electrochemical Sensor  [PDF]
Peidong Xu, Changsheng Qiao, Shufeng Yang, Lijuan Liu, Mingwei Wang, Juankun Zhang
Engineering (ENG) , 2012, DOI: 10.4236/eng.2012.410B034
Abstract:
Under the condition of weak acidity of pH 5.2, a sensitive vitamin B2 electrochemical sensor based on molecularly imprinted nonconducting polymer of o-aminophenol by potentiostatic polymerization in the presence of template(vitamin B2) on a glassy carbon electrode was prepared, and its performance was studied. The sensor exhibited good sensitivity and selectivity to VB2. The detection limit went down to 2.3851nM, and a linear relationship between the current incremental and the concentration was found in the range of 10~120nM. And the sensor could use in detection of VB2 real sample for a long time and show good reproducibility. The average recovery rate to VB2 was 98.41%.
Ultafast organic nonlinear optical molecules and the realization of mesoscopic photonic devices
QiHuang Gong,XiaoYong Hu,Hong Yang,ShuFeng Wang
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-010-3183-7
Abstract: In the twentieth century, revolutionary changes took place in the human society and people’s life-style due to the improvement of the optoelectronic information technology based on the second-order nonlinear optical effects, such as the electro-optic effect, the second harmonic generation (SHG), and so on. Along with the rapid development of light information technology, new principles and methods of nonlinear optics are needed, and the third-order nonlinear optical effects attract great attention. The research progress of nonlinear optics is reviewed in this article. Our research work on the third-order nonlinear optical materials, ultrafast and low-power organic all-optical photonic crystal switching are introduced.
Discovery of Permian islandarc basalts in the Cenxi area and the tectonic significance
Boyou Zhang,Zhenhua Zhao,Manquan Shi,Shufeng Yang,Hanlin Chen
Chinese Science Bulletin , 1998, DOI: 10.1007/BF02883385
Abstract: Cenxi Permian basalts are the late Palaeozoic island-arc type basalts first found in South China. REE and trace element characteristics and distribution patterns show that this volcanic formation, which has been isotopically dated at 261 MaB. P. by the39Ar/40Ar method, is of an active continental marginal island arc type, and that the tectonic environment at that time was an island-arc marginal sea or minor ocean basin related with the paleo-Tethyan tectonic belt in western Guangdongeastern Guangxi.
Hf isotopes of zircon megacrysts from the Cenozoic basalts in eastern China
Zhili Qiu,Fuyuan Wu,Qingyuan Yu,Liewen Xie,Shufeng Yang
Chinese Science Bulletin , 2005, DOI: 10.1007/BF03183658
Abstract: Cenozoic basalts are widely distributed in eastern China, and some of them contain zircon megacrysts which are considered to be constituent mineral of the subcontinental lithospheric mantle (SCLM) and petrogenetically related to mantle metasomatism induced by addition of crustal materials. Using the Laser Ablation Multiple Collector Inductively Coupled Plasma Mass Spectrometry (LA-MC-ICPMS), zircon megacrysts from the Cenozoic basalts at Changle in Shandong, Mingxi in Fujian, and Penglai in Hainan provinces have been used for Hf isotopic analyses. The data indicate that there is no significant deviation for the different zircon grains in each locale, except those from Penglai. The obtained176Hf /177Hf ratios are 0.28302–0.28308 for Changle, 0.28297–0.28300 for Mingxi, and 0.28288–0.28293 for Penglai, with correspondingεHf values of 8.7–10.8, 7.0–7.9, and 3.9–5.7, respectively. These data display that there existed some regional heterogeneity, but the Hf model ages clustere in the Phanerozoic. Therefore, it is inferred that metasomatism of the lithospheric mantle beneath eastern China took place in the Phanerozoic, most probably in the Mesozoic-Cenozoic. However, the formation time of the lithospheric mantle is not clearly constrained based on the present Hf isotopic data.
Research on the Interference Trend of National Taxation with Price and Inflation  [PDF]
Shufeng Wang, Junwei Han
Open Journal of Social Sciences (JSS) , 2018, DOI: 10.4236/jss.2018.63011
Abstract:
In view of the objective reality that the market prices stay high in recent years, inflation which continues to rise is not effectively inhibited, combined with the previous economic circles who attributed the reasons to inflation for commodity supply and demand, the issuance of money and neglect the role of tax factors led to national governance inflation decision-making that is limited by the phenomenon. By means of comparative analysis, Granger causality analysis and Augmented Dickey-Fuller test, we dissect the external disturbance and endogenous factors of influencing inflation, select the 2001-2016 tax index and CPI index and make an empirical research of the interference from government taxation to price and inflation trends and strength. It is approved there is single causal relationship between tax and price rising, and sums up that government taxation can promote inflation, but inflation can’t lead to tax rising. Of course, this conclusion can also provide theoretical support for national governance of inflation.
Age and genesis of the Myanmar jadeite: Constraints from U-Pb ages and Hf isotopes of zircon inclusions
ZhiLi Qiu,FuYuan Wu,ShuFeng Yang,Min Zhu,JinFeng Sun,Ping Yang
Chinese Science Bulletin , 2009, DOI: 10.1007/s11434-008-0490-3
Abstract: Myanmar jadeite (jadeitite) is well known for its economical value and distinctive tectonic locality within the collisional belt between India and Eurasian plates. However, it is less studied for its genesis and geodynamic implications due to precipitous topography, adverse weather and local military conflicts in the area. By means of combined ICP-MS and LA-MC-ICPMS techniques, we have carried out in-situ trace elements, U-Pb and Lu-Hf isotopes for zircon inclusions in a piece of jadeite gem sample. CL imaging suggests that the zircons are metasomatic in origin, and contain mineral inclusions of jadeite and omphacite. Seventy-five analyses on 16 grains of the zircons yield a U-Pb age of 158 ± 2 Ma. The Myanmar zircons differ from other types in that they have no significant Eu anomalies despite high HREE concentrations. Measured 176Hf/177Hf ratios range from 0.282976 to 0.283122, with an average value of 0.283066 ± 7; εHf(t) value of 13.8 ± 0.3 (n=75). These results indicate that the Myanmar jadeite was formed in the Late Jurassic, probably by interaction of fluid released from subducted oceanic slab with mantle wedge. Therefore, its formation has no genetic relationship to the continental collision between Indian and Euroasian plates.
Association between polymorphisms in the coagulation factor VII gene and coronary heart disease risk in different ethnicities: a meta-analysis
Xingbo Mo, Yongchen Hao, Xueli Yang, Shufeng Chen, Xiangfeng Lu, Dongfeng Gu
BMC Medical Genetics , 2011, DOI: 10.1186/1471-2350-12-107
Abstract: Literature-based searching was conducted to collect data and two methods, namely fixed-effects and random-effects, were performed to pool the odds ratio (OR), together with the 95% confidence interval (CI). Publication bias and between-study heterogeneity were also examined.Thirty-nine case-control studies of the three polymorphisms, R353Q (rs6046), HVR4 and -323Ins10 (rs36208070) in factor VII gene and CHD were enrolled in this meta-analysis, including 9,151 cases of CHD and 14,099 controls for R353Q, 2,863 cases and 2,727 controls for HVR4, and 2,862 cases and 4,240 controls for -323Ins10. Significant association was only found in Asian population for R353Q (Q vs R), with pooled OR of 0.70(95%CI: 0.55, 0.90). For the -323Ins10 polymorphism (10 vs 0), we found significant associations in both Asian and European populations, with pooled ORs of 0.74(95%CI: 0.61, 0.88) and 0.63(95%CI: 0.53, 0.74), respectively. Marginal significant association was found between HVR4 (H7 vs H5+H6) and CHD (OR = 0.88, 95% CI: 0.78, 1.00). There was no evidence of publication bias, but between-study heterogeneity was found in the analyses.The -323Ins10 polymorphism in factor VII gene is significantly associated with CHD in both Asian and European populations, while R353Q polymorphism showed trend for association with CHD in Asians. Lack of association was found for HVR4 polymorphism. Further studies are needed to confirm the association, especially for -323Ins10 polymorphism.Coronary heart disease (CHD) is the most common cause of death in industrialized countries, and is rapidly increasing in prevalence in developing countries such as China and India. CHD is a multifactorial disease influenced by both genetic and environmental determinants. Coagulation activation plays a key role in thrombus formation and variation and its factors have been associated with the risk of CHD. Activation of the extrinsic coagulation pathway plays a key role in hemostasis, and thus factor VII contributes to
Magma flow inferred from magnetic fabrics in Wanning gabbro pluton and diabase dykes, Hainan
XiaoQing Pan,ZhongYue Shen,ChuanWan Dong,HanLin Chen,XiaoGan Cheng,ShuFeng Yang,ZhiLiang Zhang
Chinese Science Bulletin , 2012, DOI: 10.1007/s11434-012-5054-x
Abstract: Measurements of anisotropy of magnetic susceptibility (AMS) were performed on a gabbro pluton and 7 diabase dykes in the Wanning area, southeast Hainan Island. Rock magnetism showed that pseudo-single domain (PSD) to multidomain (MD) Ti-poor magnetite carries the magnetic fabric in the gabbro pluton whereas MD Ti-poor magnetite carries the magnetic fabric in the diabase dykes. The corrected anisotropy degree (P j ) in most specimens was found to be less than 1.2 which is indicative of a possible flow-related magnetic fabric. The AMS eigenvectors within each site are generally well grouped. The maximum susceptibility axes (K 1) of the gabbro pluton are inclined towards the north at low angles (< 30°). K 1 axes of the diabase dykes are inclined towards the NNW and SSE with dip angles of 30°. From this study, it appears that the emplacement mode of the gabbro pluton was characterized by intrusion from the north to the south at a low angle whereas the diabase dykes were emplaced from the NNW to the SSE at low to moderate angles. This was verified by comparison of the rock fabric to the magnetic fabric. All of this evidence leads to the conclusion that the Wanning gabbro pluton and diabase dykes were the products of pulsative intrusion from the same magma chamber in the area far to the north of Wanning, which suggests that basic rocks may exist beneath the Indosinian granite in the area to the north of Wanning.
Tectonic evolution of Tethyan tectonic field, formation of Northern Margin basin and explorative perspective of natural gas in Tarim Basin
Shufeng Yang,Chengzao Jia,Hanlin Chen,Guoqi Wei,Xiaogan Cheng,Dong Jia,Ancheng Xiao,Shaojie Guo
Chinese Science Bulletin , 2002, DOI: 10.1007/BF02902816
Abstract: Analyzing the characteristics of the Tethyan tectonic field, the authors think that the Tethyan tectonic field underwent three evolutional stages: closing of Paleo-Tethys and rifting of Neo-Tethys from early Permian to late Triassic, subduction of Neo-Tethys and collision between the Indian plate and the Eurasia plate from Jurassic to early of low Tertiary, and collision between the Arab plate and the Eurasia plate and the A-type subduction of Indian plate from late of low Tertiary to the present. Combining the evolution of the Tethyan orogenic belt with the characteristics of the Northern Margin basin, it is suggested that the sedimentary and tectonic characteristics and types of the Northern Margin basin are controlled by the formation and evolution of the Tethyan orogenic belt and the ingression of Tethys. The evolution of Northern Margin basin can be divided into three development stages: back-arc foreland basin from late Permian to Triassic, the back-arc fault subsidence and depression from Jurassic to the early of low Tertiary, and the reactive foreland basin from the late of low Tertiary to the present. The Northern Margin basin in the Tethyan tectonic field is an important region for natural gas accumulation, and the Tarim Basin is a part of this region.
Geological thermal events in Tarim Basin
Hanlin Chen,Shufeng Yang,Chuanwan Dong,Guoqiang Zhu,Chengzao Jia,Guoqi Wei,Zhengguo Wang
Chinese Science Bulletin , 1997, DOI: 10.1007/BF03182623
Abstract:
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