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| 1 | Geological characteristics and metallogenic significance of the Devonian intermediate-basic volcanic rocks in the Dachang deposit, Guangxi Zhuang Autonomous Region显示文摘Recently discovered intermediate-basic volcanic rocks in the Devonian strata at Dachang, Guangxi Zhuang Autonomous Region are dominated by basalts and andesites. Most of them belong to the calc-alkali and alkali series. Petrology and geochemistry data indicate that the volcanic rocks may be formed in a continental rift environment. The volcanic rocks are in conformable contact with the overlying and underlying wall rocks, with such typical sedimentary structures as laminated and striped ones, and the host rocks of the volcanic rocks contain lots of marine fossils such as tentaculite. Many pieces of evidence indicate that the eruption environment of the volcanic rocks is a sea-facies one. The volcanic rocks are of the LREE-enrichment type, with high ratios of light rare-earth elements to heavy rare-earth elements. In addition, they display moderately negative δEu anomalies and moderately negative δCe anomalies with a higher degree of LREE and HREE fractionation. Through the Q-cluster analysis of the REE samples, it is indicated that the ores have a closer relation with the layered volcanic rocks, and also possess a certain inheritance-consistency relationship with the layered volcanic rocks. The source of ore-forming materials may be related with volcanism. It is proposed that the ore deposit in the study area should be genetically explained as the result of marine volcano-sedimentary exhalation of hot water and late superposition-reworking. | YAN Yongfeng LIU Chenming QIN Dexian JIANG Kai | 2013 | Chinese Journal Of Geochemistry2013，32，1： | 9 |
| 2 | High-average-power, high-repetition-rate tunable terahertz difference frequency generation with GaSe crystal pumped by 2 μm dual-wavelength intracavity KTP optical parametric oscillator显示文摘We have demonstrated a high-average-power,high-repetition-rate optical terahertz(THz)source based on difference frequency generation(DFG)in the GaSe crystal by using a near-degenerate 2μm intracavity KTP optical parametric oscillator as the pump source.The power of the 2μm dual-wavelength laser was up to 12.33 W with continuous tuning ranges of 1988.0–2196.2 nm/2278.4–2065.6 nm for two waves.Different GaSe cystal lengths have been experimentally investigated for the DFG THz source in order to optimize the THz output power,which was in good agreement with the theoretical analysis.Based on an 8 mm long GaSe crystal,the THz wave was continuously tuned from 0.21 to 3 THz.The maximum THz average power of 1.66μW was obtained at repetition rate of 10 kHz under 1.48 THz.The single pulse energy amounted to 166 pJ and the conversion efficiency from 2 μm laser to THz output was 1.68×10^(-6).The signal-to-noise ratio of the detected THz voltage was 23 dB.The acceptance angle of DFG in the GaSe crystal was measured to be 0.16°. | DEXIAN YAN YUYE WANG DEGANG XU PENGXIANG LIU CHAO YAN JIA SHI HONGXIANG LIU YIXIN HE LONGHUANG TANG JIANCHEN FENG JIANQIN GUO WEI SHI KAI ZHONG YUEN H.TSANG JIANQUAN YAO | 2017 | Photonics Research2017，5，2： | 5 |
| 3 | Plasmon-tunable Au@Ag core-shell spiky nanoparticles for surfaceenhanced Raman scattering显示文摘A facile synthetic approach has been developed to prepare uniform and size-tunable spiky Au@Ag core-shell nan oparticles (NPs) to tailor the localized surface plasm on res onance (LSPR) properties. The gradual assembly of small Au nano crystals allows the size of spiky Au NPs to be modulated from tens to several hundreds of nano meters by tuning the concentration of initial Au seeds and Au source;and the thick ness of the Ag shell can be adjusted with stepwise reduction of Ag(l)ions. The LSPR bands of such spiky Au@Ag core-shell NPs resemble those of pure spiky Au NP cores of similar sizes in near-infrared region, and increasing the Ag shell thickness results in a blue shift and broadening of the LSPR band in the n ear-i nfrared regi on. Additi on ally, the spiky Au@Ag core-shell NPs exhibit improved surface-e nhan ced Rama n scattering (SERS) activity as compared to the bare spiky Au NPs and spherical Ag@Au NPs. This work has offered a facile route to synthesize plasmonic metal NPs with LSPR band in 650 to 800 nm that show strong enhancement of localized electromagnetic field, which provides an effective SERS substrate for SERS imaging and detection in biological fluids and tissues. | Zhulin Huang Guowen Meng Xiaoye Hu Qijun Pan Dexian Huo Hongjian Zhou Yan Ke Nianqiang Wu | 2019 | Nano Research2019，12，2： | 4 |
| 4 | Influences of the Three Gorges Dam in China on Precipitation over Surrounding Regions显示文摘Impacts of the Three Gorges Dam(TGD) in China on the regional pattern and annual amount of precipitation around the Three Gorges Reservoir(TGR) are examined by comparing observations before and after the operation of TGD(1984–2003 and 2004–13). Empirical orthogonal function(EOF) analysis of the annual precipitation anomalies clearly indicates that the land-use change associated with the construction of TGD has not significantly changed the precipitation pattern. To investigate the impacts of TGD on the rainfall amount, we compare the relative variations of atmospheric variables related to precipitation formation in three spatial bands: over TGR, near TGR, and far from TGR. It is found that the differences in annual rainfall over TGD between the two periods before and after the operation of TGD are small, suggesting a weak impact of TGD on the rainfall amount. The TGD water level increased from 66 m before June 2003 to 175 m after 2010, and this may have slightly reduced precipitation on the local scale. | Yan LI Weican ZHOU Xianyan CHEN Dexian FANG Qianqian ZHANG | 2017 | Journal of Meteorological Research2017，31，4： | 1 |
| 5 | Global optimization of non-convex nonlinear programs using line-up competiticn algorithm显示文摘 | Yan Liexiang Ma Dexian | 2001 | Computers and Chemical Engineering2001，25，11： | 1 |
| 6 | Removal of humic substances from soil DNA using aluminium sulfate显示文摘 | DONG DEXIAN YAN AN LIU HAIMING | 2006 | J Microbiol Methods2006，66，2： | 1 |
| 7 | Global Optimization of Non-convex Nonlinear Programs Using Line-up Competition Algorithm显示文摘 | Yan Liexiang Ma Dexian | 2001 | Computers and Chemical Engineering2001，25，1112： | 1 |
| 8 | The development of mine digitization information system and its application to the Lanping Pb-Zn mine显示文摘To compile the software package of the mine digitization information system in terms of the principle and methods of mathematics geology and geographic information system using computer languages such as VB and Matlab,this paper introduces the function composition and operating environment of this information system,and illustrates the function and effectiveness of the software package as exemplified by the Lanping Pb-Zn mine,Yunnan Province. | YAN Yongfeng QIN Dexian YU Yangxian LI Shilei JIA Fengqin WANG Xiaoli LIU Fangcheng | 2008 | Chinese Journal Of Geochemistry2008，27，3： | 1 |
| 9 | Removal of humic substances from soil DNA using aluminium sulfate显示文摘 | Dexian Dong An Yan Haiming Liu Xuehong Zhang Yuquan Xu | 2005 | Journal of Microbiological Methods2005，，2： | 1 |
| 10 | Global optimization of nonconvex nonlinear programs using Line-up Competition Algorithm显示文摘 | Yan Liexiang Ma Dexian | 2001 | Computers&Chemical Engineering2001，25，1112： | 1 |
| 11 | Effects of Solanum lycopersicum Rootstock Grafting on Tomato Resistance and Quality显示文摘[Objectives] This experiment was carried out to explore the effects of Solanum lycopersicum rootstock grafting on tomato resistance and quality. [Methods]6 different S. lycopersicum rootstocks were used to graft ‘Guihong 2' tomato. The grafting affinity was better and the resistance to bacterial wilt was higher.[Results]S. lycopersicum rootstock grafting may reduce the tomato,but it can improve the taste and endogenous quality of tomato. Besides,soluble solids,soluble sugars,Vc content,and sugar-acid ratio were all significantly higher than that of the control group. [Conclusions] S. lycopersicum rootstock y11,53,and 177 grafting can increase Vc,soluble solids,and sugar-acid ratio of tomato fruit,so they are optimal rootstocks for tomato grafting. | Guiyun GAN Kouhua YU Yaqin JIANG Yongcheng MO Wenjia LI Yongguan WU Yan LI Dexian KANG Yikui WANG | 2018 | Agricultural Biotechnology2018，7，5： | 0 |
| 12 | Researching on the Digital Information Systems of Mine and its Applications显示文摘The article introduces several digital information systems of mine which established on PC platform by the author using the software package of mathematical economic modal of deposit, GIS software, and furthermore putting them into solving the dynamic management of mine produce, produce programming, produce scheme and decision optimization of systems, rational utilization of the resource, searching ore and increasing reserves on the margin or in the deep part of those old mines .etc, so improving the socialize economic efficiency of mining exploiture. | Yang Jianyu Qin Dexian Chen Aibing Yan Yongfeng Gao Zhiwu Li Yujian | 2005 | 工程科学(英文版)2005，3，4： | 0 |
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