|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Stratigraphy of the Triassic-Jurassic Boundary Successions of the Southern Margin of the Junggar Basin,Northwestern China显示文摘The Triassic-Jurassic(Tr-J) boundary marks a major extinction event,which(~200 Ma) resulted in global extinctions of fauna and flora both in the marine and terrestrial realms.There prevail great challenges in determining the exact location of the terrestrial Tr-J boundary,because of endemism of taxa and the scarcity of fossils in terrestrial settings leading to difficulties in linking marine and terrestrial sedimentary successions.Investigation based on palynology and bivalves has been carried out over a 1113 m thick section,which is subdivided into 132 beds,along the Haojiagou valley on the southern margin of the Junggar Basin of the northern Xinjiang,northwestern China.The terrestrial Lower Jurassic is conformably resting on the Upper Triassic strata.The Upper Triassic covers the Huangshanjie Formation overlaid by the Haojiagou Formation,while the Lower Jurassic comprises the Badaowan Formation followed by the Sangonghe Formation.Fifty six pollen and spore taxa and one algal taxon were identified from the sediments.Based on the key-species and abundance of spores and pollen,three zones were erected:the Late Triassic(Rhaetian) Aratrisporites-Alisporites Assemblage,the Early Jurassic(Hettangian) Perinopollenites-Pinuspollenites Assemblage,and the Sinemurian Perinopollenites-Cycadopites Assemblage.The Tr-J boundary is placed between bed 44 and 45 coincident with the boundary between the Haojiagou and Badaowan formations.Beds with Ferganoconcha(?),Unio-Ferganoconcha and Waagenoperna-Yananoconcha bivalve assemblages are recognized.The Ferganoconcha(?) bed is limited to the upper Haojiagou Formation, Unio-Ferganoconcha and Waagenoperna-Yananoconcha assemblages are present in the middle and upper members of the Badaowan Formation.The sedimentary succession is interpreted as terrestrial with two mainly lake deposit intervals within Haojiagou and Badaowan formations,yielding fresh water algae and bivalves.However,the presence of brackish water algae Tasmanites and the marine-littoral facies bivalve Waagenoperna from the Badaowan Formation indicate that the Junggar Basin was influenced by sea water caused by transgressions from the northern Tethys,during the Sinemurian. | SHA Jingeng Vivi VAJDA PAN Yanhong Linda LARSSON YAO Xiaogang ZHANG Xiaolin WANG Yaqiong CHENG Xiansheng JIANG Baoyu DENG Shenghui CHEN Siwei PENG Bo | 2011 | Acta Geologica Sinica(English Edition)2011，85，2： | 7 |
| 2 | New Dopa-AIE Compound Used as Fluorescence Sensor Material: Specificity and Quantification for Cu(Ⅱ)显示文摘As a paramagnetic metal ion, Cu(Ⅱ) is challenging to be detected by conventional fluorescence sensor becauseof its unselective paramagnetic quenching effects on common fluorophores. By combining catechol with tetra-phenylethene, a typical aggregation-induced emission (AIE) moiety, we have successfully synthesized a new kindof catechol, the dopa-AIE compound. Due to the properties of AlE core, the catechol has the "turn on" mechanismas a fluorescence chemosensor. Specifically, the new catechol has the unique detection selectivity on Cu(Ⅱ) in solu-tion. The fluorescence intensity has the maximum value when the molar ratio of the catechol to Cu(Ⅱ) is 1 : 1. Be-fore and after this point, the fluorescence intensity shows a linear relationship with the copper ion concentration, in-creasing or decreasing. Thus, the quantitative calculation for Cu(Ⅱ) or the dopa-AIE compound could be done ac-cording to this response process. | Siwei Liu Jing Cheng Jiarui Xu | 2017 | Chinese Journal of Chemistry2017，35，3： | 3 |
| 3 | Sieving carbons promise practical anodes with extensible low-potential plateaus for sodium batteries显示文摘Non-graphitic carbons are promising anode candidates for sodium-ion batteries,while their variable and complicated microstructure severely limits the rational design of high-energy carbon anodes that could accelerate the commercialization of sodium-ion batteries,as is the case for graphite in lithium-ion batteries.Here,we propose sieving carbons,featuring highly tunable nanopores with tightened pore entrances,as high-energy anodes with extensible and reversible low-potential plateaus(<0.1 V).It is shown that the tightened pore entrance blocks the formation of the solid electrolyte interphase inside the nanopores and enables sodium clustering to produce the plateau.Theoretical and spectroscopic studies also show that creating a larger area of sodiophilic pore surface leads to an almost linearly increased number of sodium clusters,and controlling the pore body diameter guarantees the reversibility of sodium cluster formation,producing a sieving carbon anode with a record-high plateau capacity of 400 mAh g.More excitingly,this approach to preparing sieving carbons has the potential to be scalable for modifying different commercial porous carbons. | Qi Li Xiangsi Liu Ying Tao Jianxing Huang Jun Zhang Chunpeng Yang Yibo Zhang Siwei Zhang Yiran Jia Qiaowei Lin Yuxuan Xiang Jun Cheng Wei Lv Feiyu Kang Yong Yang Quan-Hong Yang | 2022 | National Science Review2022，9，8： | 3 |
| 4 | Effect of Deposition Temperature on Dynamics and Mechanism of Deposition for Si-B-C Ceramic from BCl_3/SiCH_3Cl_3/H_2 Precursor显示文摘The deposition rate, phase, chemical composition and microstructure of deposits were determined from 950 to 1100℃. With increasing temperature, the deposition rate increases, and the morphology changes from smooth to coarse, meanwhile, the concentration of silicon increases while that of boron decreases. The deposition process is controlled by chemical reactions, and the activation energy is 271 kJ/mol. At relatively lower temperature (below 1000℃), the deposition process is dominated by formation of B4C. While at higher temperature (above 1000℃), it is governed by formation of SiC. B4C and SiC disperse uniformly in the Si-B-C co-deposition system and form a dense network structure. | Xinzhang Zuo Litong Zhang Yongsheng Liu Siwei Li Laifei Cheng | 2012 | Journal of Materials Science & Technology2012，28，9： | 2 |
| 5 | Supply Chain Optimization of Continuous Process Industries with Sustainability Considerations 显示文摘 | Zhou Zhangyu Cheng Siwei | 2000 | Computers and Chemical Engineering2000，，24： | 1 |
| 6 | Supply chain optimization of continuous process industries with sustainability consideration 显示文摘 | Zhou Zhangyu Cheng Siwei Hua Ben | 2000 | Computers & Chemical Engineering2000，24，27： | 1 |
| 7 | Supply chain optimization of continuous process industries with sustainability considerations 显示文摘 | Zhou Zhangyu Cheng Siwei Hua Ben | 2000 | Computers & Chem Eng2000，24，27： | 1 |
| 8 | Supply chain optimization of continuous process industries with sustainability considerations显示文摘 | Zhou Zhangyu Cheng Siwei Hua Ben | 2000 | Computers & Chem Eng2000，24，27： | 1 |
| 9 | Investigation on preparing boron nitride by nitriding pure boron at 1200-1550℃ | Fang Ye a,b,Litong Zhang a,b,Yongsheng Liu a,b,Siwei Li c,Meng Su a,b,Xiaowei Yin a,b,Laifei Cheng a,b a Science and Technology on Thermostructural Composite Materials Laboratory,Northwestern Polytechnical University,Xi’an,Shaanxi 710072,PR China b State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an,Shaanxi 710072,PR China c Key Laboratory of High Performance Ceramic Fibers(Ministry of Education),College of Materials,Xiamen University,Xiamen,Fujian 361005,PR China | 2012 | Progress in Natural Science:Materials International2012，22，5： | 1 |
| 10 | Progress in Risk Measurement显示文摘 | Siwei Cheng Yanhui Liu and Shouyang Wang | 2004 | AMO-Adanced Modelling and Optimization2004，，： | 1 |
| 11 | Supply chain optimization of con tinuous process industries with sustainability considerations显示文摘 | Cheng Siwei Hua Ben | 2000 | Computer a nd Chemical Engineering2000，24，： | 1 |
| 12 | Supply chain optimization of continuous process industries with sustainability considerations 显示文摘 | Zhou Zhangyu Cheng Siwei Hua Ben | 2000 | Computers and Chemical Engineering2000，24，27： | 1 |
| 13 | PSE in China:retrospect and prospects显示文摘 | Yang Youqi Cheng Siwei | | 0，，： | 1 |
| 14 | Quick assembly of 1-alkylidenyl-tetrahydroisoquinolines via a Catellani reaction/NBS-mediated cyclization sequence and synthetic applications显示文摘We herein disclose a modular synthesis of 1-bromomethylene-THIQs involving a Catellani reaction of aryl iodides,aziridines,and terminal alkynes followed by an N-bromosuccinimide(NBS)-mediated cyclization.This approach features mild reaction conditions,wide substrate scope,good step-economy and good scalability.Based on this new method,we have accomplished the concise total synthesis of(±)-cularine,formal synthesis of 8-oxopseudopalmatine as well as the first total synthesis of dactyllactone A,demonstrating the wide synthetic potential of this method. | Shihu Jia Miao Bai Siwei Zhou Ruiqing Sheng Hong-Gang Cheng Qianghui Zhou | 2023 | Science China Chemistry2023，66，11： | 0 |
| 15 | Towards quantitative determination of atomic structures of amorphous materials in three dimensions显示文摘Amorphous materials such as glass,polymer and amorphous alloy have broad applications ranging from daily life to extreme conditions due to their unique properties in elasticity,strength and electrical resistivity.A better understanding of atomic structure of amorphous materials will provide invaluable information for their further engineering and applications.However,experimentally determining the three-dimensional(3D)atomic structure of amorphous materials has been a long-standing problem.Due to the disordered atomic arrangement,amorphous materials do not have any translational and rotational symmetry at long-range scale.Conventional characterization methods,such as the scattering and the microscopy imaging,can only provide the statistic structural information which is averaged over the macroscopic region.The knowledge of the 3D atomic structure of amorphous materials is limited.Recently atomic resolution electron tomography(AET)has proven an increasingly powerful tool for atomic scale structural characterization without any crystalline assumptions,which opens a door to determine the 3D structure of various amorphous materials.In this review,we summarize the state-of-art characterization methods for the exploration of atomic structures of amorphous materials in the past few decades,including X-ray/neutron diffraction,nano-beam and angstrom-beam electron diffraction,fluctuation electron microscopy,high-resolution scanning/transmission electron microscopy,and atom probe tomography.From experimental data and theoretical descriptions,3D structures of various amorphous materials have been built up.Particularly,we introduce the principles and recent progress of AET,and highlight the most recent groundbreaking feat accomplished by AET,i.e.,the first experimental determination of all 3D atomic positions in a multi-component glass-forming alloy and the 3D atomic packing in amorphous solids.We also discuss the new opportunities and challenges for characterizing the chemical and structural defects in amorphous materials. | Zhiheng Xie Yao Zhang Siwei Huang Zezhou Li Qi Cheng Jihan Zhou | 2023 | National Science Open2023，2，3： | 0 |
| 16 | COMPLEXITY SCIENCE & MANAGEMENT显示文摘Ⅰ. SCIENCE IS FACING A SHARP TURN Complexity science is a new scientific category that made its debut in the 1980s. It is a newly emerging discipline concerning research into complexity itself, and its application to complex systems. Although it is still in its infancy, it has been hailed by some leading scientists as 'the science for the 21st century.' | Cheng Siwei(Department of Management Sciences, the National Natural Science Foundation of China) | 1999 | Bulletin of the Chinese Academy of Sciences1999，13，3： | 0 |
| 17 | China-East Asia Cooperation——In the Context of Economic Globalization and Regional Integration显示文摘Ⅰ.Economic globalization and regional integration Economic globalization, a general trend in the world’s development today, is interdependence for various countries in its real sense. Economic globalization, which began in the initial stage of development of capitalism, has a history of over a hundred years, and has undergone several stages from raw material procurement to trade in commodities and then to technology transfer and capital export, making economic | Cheng Siwei is Vice Chairman of the Standing Committee of the National People’s Congress of China. | 2006 | China International Studies2006，26，3： | 0 |
| 18 | Status and Perspectives of Process Systems Engineering显示文摘The definitions, methodology, applications, and perspectives of process systems engineering are discussed from a strategic point of view. The focal points in future development of process systems engineering are to break through in methodology, to expand application fields, and to develop a new generation of process simulation systems. | Siwei, Cheng | 1992 | Journal of Systems Engineering and Electronics1992，3，1： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员