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| 1 | Comparative Study of Acid and Alkaline Stimulants with Granite in an Enhanced Geothermal System显示文摘The Enhanced Geothermal System(EGS) is an artificial geothermal system that aims to economically extract heat from hot dry rock(HDR) through the creation of an artificial geothermal reservoir. Chemical stimulation is thought to be an effective method to create fracture networks and open existing fractures in hot dry rocks by injecting chemical agents into the reservoir to dissolve the minerals. Granite is a common type of hot dry rock. In this paper, a series of chemical stimulation experiments were implemented using acid and alkaline agents under high temperature and pressure conditions that mimic the environment of formation. Granite rock samples used in the experiments are collected from the potential EGS reservoir in the Matouying area, Hebei, China. Laboratory experimental results show that the corrosion ratio per unit area of rock is 3.2% in static acid chemical experiments and 0.51% in static alkaline chemical experiments. The permeability of the core is increased by 1.62 times in dynamic acid chemical experiments and 2.45 times in dynamic alkaline chemical experiments. A scanning electron microscope analysis of the core illustrates that secondary minerals, such as chlorite, spherical silica, and montmorillonite, were formed, due to acid-rock interaction with plagioclase being precipitated by alkaline-rock interactions. Masking agents in alkaline chemical agents can slightly reduce the degree of plagioclase formation. A chemical simulation model was built using TOUGHREACT, the mineral dissolution and associated ion concentration variation being reproduced by this reactive transport model. | XU Jianan FENG Bo CUI Zhenpeng LIU Xiyao KE Zunsong FENG Guanhong | 2021 | Acta Geologica Sinica(English Edition)2021，95，6： | 2 |
| 2 | Efficient photoreduction strategy for uranium immobilization based on graphite carbon nitride/activated carbon nanocomposites显示文摘Uranium removal from aqueous solutions using environmentally friendly photocatalytic technology is a novel approach for resource recovery.Herein,carbon nitride/activated carbon composite materials(CN/AC)were investigated for U(Ⅵ)reduction under visible light.An exceptional boost in photocatalytic activity was observed for CN/AC composites(up to 70 times over the conventional bulk g-C_(3)N_(4)).The strong interactive conjugatedπ-bond structure between g-C_(3)N_(4) and AC accelerated the migration of carriers and then prolonged the electron lifetime.CN/AC composites exhibited excellent compatibility with different water substrates and were resilience to a wide range of p H changes and abundant competitive anions/cations.Quenching experiments and electron microscopy characterization indicated that U(VI)was reduced by photogenerated electrons and deposited on the edge of CN/AC composites.The low-cost,high-performance carbon-based composite material proposed in this work is a potential candidate for the efficient treatment of radioactive wastewater. | Shuyang Li Zhiwei Niu Duoqiang Pan Zhenpeng Cui Hewen Shang Jie Lian Wangsuo Wu | 2022 | Chinese Chemical Letters2022，33，7： | 1 |
| 3 | Interfacial charge transfer and photocatalytic activity in a reverse designed Bi_(2)O_(3)/TiO_(2)core-shell显示文摘In this study,the electronic and photocatalytic properties of core-shell heterojunctions photocatalysts with reversible configuration of TiO_(2)and Bi_(2)O_(3)layers were studied.The core-shell nanostructure,obtained by efficient control of the sol-gel polymerization and impregnation method of variable precursors of semiconductors,makes it possible to study selectively the role of the interfacial charge transfer in each configuration.The morphological,optical,and chemical composition of the core-shell nanostructures were characterized by high-resolution transmission electron microscopy,UV-visible spectroscopy and X-ray photoelectron spectroscopy.The results show the formation of homogenous TiO_(2)anatase and Bi_(2)O_(3)layers with a thickness of around 10 and 8 nm,respectively.The interfacial charge carrier dynamic was tracked using time resolved microwave conductivity and transition photocurrent density.The charge transfer,their density,and lifetime were found to rely on the layout layers in the core-shell nanostructure.In optimal core-shell design,Bi_(2)O_(3)collects holes from TiO_(2),leaving electrons free to react and increase by 5 times the photocatalytic efficiency toward H2 generation.This study provides new insight into the importance of the design and elaboration of optimal heterojunction based on the photocatalyst system to improve the photocatalytic activity. | Sabina Ait ABDELKADER Zhenpeng CUI Abdelghani LAACHACHI Christophe COLBEAU-JUSTIN Mohamed Nawfal GHAZZAL | 2021 | Frontiers in Energy2021，15，3： | 0 |
| 4 | Synthesis and Biological Evaluation of Gem-Difluoro- methylenated Statin Derivatives as Highly Potent HMG-CoA Reductase Inhibitors显示文摘HMG-CoA reductase inhibitors were widely used as lipid-lowing agents through effectively blocking the rate-limiting step of cholesterol biosynthesis. 8 analogs of Rosuvastatin were firstly prepared with different distance andfunctional group between the O5-hydroxyl group and terminal COOH group in the hydrophilic side-chain. In pri-mary and secondary screening of the inhibitory activities against human HMG-CoA reductase, gem-difluorometh-ylenated derivatives exhibited more than 50% inhibition rate. Then 4 compounds with gem-difluoro group werefurther synthesized and evaluated in vitro, three compounds among them exhibited low single digital nmol/L ICs0values against HMG-CoA reductase. Molecular docking also well explained the observed special contribution of thegem-difluoro group. | Zhao Zhao Jiaxin Cui Yan Yin Heng Zhang Yecheng Liu Rui Zeng Chao Fang Zhenpeng Kai ZhonghuaWang Fanhong Wu | 2016 | Chinese Journal of Chemistry2016，34，8： | 0 |
| 5 | A methodology for constructing the aircraft design schema显示文摘Aircraft collaboration design is based on a unified set of schemas containing data and model representations and interfaces across disciplines.The aircraft design schema is a central data model that specifies the paradigm for the representation of a full lifecycle model of aircraft design.The construction of the schema currently lacks theoretical guidance.This paper designs a novel methodology to construct the aircraft design schema,a fully functional,logical,and selfconsistent methodology.The methodology defines a schema matrix that includes implementation strategies,principles,processes,meta-object facility,views,scenarios,and products.The aircraft conceptual design schema is constructed according to the methodology,which is a hands-on approach to help understand the concept and implementation.The features of the methodology are analyzed,and the methodology and the aircraft conceptual design schema are presented to address the pain points of multiple solution trade-offs,multiple iterations,and multidisciplinary coupling in aircraft conceptual collaboration design. | Xiaojian SUN Mingqiang LUO Zhiyang CUI Zhenpeng JI Hu LIU | 2023 | Chinese Journal of Aeronautics2023，36，8： | 0 |
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