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Potential development of all-inorganic perovskites

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Frontiers of physics 2021年第3期16卷 7-10页

作者： Pengyi Yue jun xing Qian Xuesen Laboratory of Space Technology China Academy of Space Technology(CAST)Beijing100094China Key Laboratory of Eco-Chemical Engineering Ministry of EducationCollege of Chemistry and Molecular EngineeringQingdao University of Science&TechnologyQingdao266042China

The energy consump tion is increasing rapidly with the continuous development of human ***,global energy still mainly depends on fossil *** awareness of the negative impact on the environment of burning fossil fuels,much attention has put on exploring clean and renewable *** solar energy has got the limitless foreground as a kind of renewable energy and photovoltaic devices can convert solar energy into electricity directly.

关键词： inorganic convert perovskite

Control of water contamination on side window of road vehicles by A-pillar section parameter optimization

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Journal of Hydrodynamics 2020年第6期32卷 1138-1150页

作者： Li Xin xing-jun Hu Jing-yu Wang State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun130025China

The water contamination on the side windows of moving vehicles is a crucial issue in improving the driving safety and the *** this paper,an effective optimization method is proposed to reduce the water contamination on the side windows of *** accuracy and the efficiency of the numerical simulation are improved by using the lattice Boltzmann method,and the Lagrangian particle tracking *** parameters are constructed on the basis of the occurrence of the water deposition on a vehicle’s side *** water contamination area of the side window and the aerodynamic drag are considered simultaneously in the design process;these two factors are used to form the multi-objective optimization function in the genetic algorithm(GA)*** approximate model,the boundary-seeded domain method,and the GA method are combined in this study to enhance the optimization *** optimization,the optimal parameters for the A-pillar section are determined by setting the boundary to an area of W=7.77 mm,L=1.27 mm and H=11.22 *** side window’s soiling area in the optimized model is reduced by 66.93%,and the aerodynamic drag is increased by 0.41%only,as compared with the original *** is shown that the optimization method can effectively solve the water contamination problem of side windows.

关键词： Water contamination aerodynamic drag A-pillar section parameters multi-objective optimization approximate model genetic algorithm

Effect of tube-electrode inner diameter on electrochemical discharge machining of nickel-based superalloy

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Chinese Journal of Aeronautics 2016年第4期29卷 1103-1110页

作者： Zhang Yan Xu Zhengyang xing jun Zhu Di College of Mechanical and Electrical Engineering Nanjing University of Aeronautics & Astronautics

Nickel-based superalloys are widely employed in modern aircraft engines because of their excellent material characteristics, particularly in the fabrication of film cooling holes. However, the high machining requirement of a large number of film cooling holes can be extremely challenging. The hybrid machining technique of tube electrode high-speed electrochemical discharge drilling (TEHECDD) has been considered as a promising method for the production of film cooling holes. Compared with any single machining process, this hybrid technique requires the removal of more complex machining by-products, including debris produced in the electrical discharge machining process and hydroxide and bubbles generated in the electrochemical machining process. These by-products significantly affect the machining efficiency and surface quality of the machined products. In this study, tube electrodes in different inner diameters are designed and fabricated, and the effects of inner diameter on the machining efficiency and surface quality of TEHECDD are investigated. The results show that larger inner diameters could effectively improve the flushing condition and facilitate the removal of machining by-products. Therefore, higher material removal efficiency, surface quality, and electrode wear rate could be achieved by increasing the inner diameter of the tube electrode. (C) 2015 The Authors. Production and hosting by Elsevier Ltd. on behalf of Chinese Society of Aeronautics and Astronautics.

关键词： Electrical discharge machining Electrochemical machining Film-cooling hole Inner diameter Nickel-based superalloys Tube electrode

Quantitative characterizations of anisotropic dynamic properties in organic-rich shale with different kerogen content

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Petroleum Science 2024年第2期21卷 855-865页

作者： Jian-Yong Xie Yan-Ping Fang xing-Hua Wu Jian'er Zhao jun-Cheng Dai jun-xing Cao Ji-Xin Deng State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of TechnologyChengdu610059SichuanChina Key Lab of Earth Exploration&Information Techniques of Ministry of Education Geophysical InstituteChengdu University of TechnologyChengdu610059SichuanChina PetroChina Southwest Oil&Gasfield Company Chengdu610017SichuanChina

Understanding the quantitative responses of anisotropic dynamic properties in organic-rich shale with different kerogen content(KC)is of great significance in hydrocarbon exploration and *** controlled experiments with a single variable is challenging for natural shales due to their high variations in components,diagenesis conditions,or pore *** employed the hot-pressing technique to construct 11 well-controlled artificial shale with varying *** artificial shale samples were successive machined into prismatic shape for ultrasonic measurements along different *** revealed bedding perpendicular P-wave velocities are more sensitive to the increasing KC than bedding paralleling velocities due to the preferential alignments of *** elastic stiffnesses except C_(13)are generally decreasing with the increasing KC,the variation of C_(1) and C_(33)on kerogen content are more sensitive than those of C_(44)and C_(66).Apparent dynamic mechanical parameters(v and E)were found to have linear correlation with the true ones from complete anisotropic equations independent of KC,which hold value towards the interpretation of well logs consistently across formations,Anisotropic mechanical parameters(ΔE and brittlenessΔB)tend to decrease with the reducing KC,withΔB showing great sensitivity to KC *** the range of low KC(10%)shale,compilation of data from natural organic rich-shales globally verified the similar systematic relationships that can be empirically used to predict the fraction of KC in shales.

关键词： Elastic properties Organic shale Anisotropy Kerogen content Physical modeling

One-step electrochemical fabrication of bilayered MgO/polymer coating on magnesium alloy

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Frontiers of Materials Science 2014年第3期8卷 307-312页

作者： jun LIANG Ren-Hui ZHANG Zhen-jun PENG Bai-xing LIU State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 China

This research demonstrates a novel one-step electrochemical method to fabricate thick bilayer coatings on magnesium alloy in acid phosphate electrolyte containing aniline monomer and styrene-acrylic emulsion （SAE） with pulsed DC voltage, The morphologies, XRD and FTIR results show that the bilayer coating consists of an inner oxide layer and an outer polyaniline （PANI）/SAE composite layer, It is believed that the bilayered structure achieved results from a hybrid process combining electropoly-merization （EPM） of aniiine, electrophoretic deposition （EPD） of SAE and plasma electrolyte oxidation （PEO） of magnesium alloy substrate. Electrochemical corrosion tests indicate that the bilayer coating can provide superior corrosion protection to the magnesium alloy substrate in 3.5 wt.% NaCl solution.

关键词： magnesium alloy bilayer coating EPD PEO corrosion resistance

Systematic relationships of Chinese freshwater semisulcospirids (Gastropoda, Cerithioidea) revealed by mitochondrial sequences

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Zoological Research 2019年第6期40卷 541-551页

作者： Li-Na Du jun Chen Guo-Hua Yu jun-xing Yang Kunming Institute of Zoology Chinese Academy of SciencesKunming Yunnan 650223China Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University) Ministry of EducationGuilin Guangxi 541004China Key Laboratory of the Zoological Systematics and Evolution Institute of ZoologyChinese Academy of SciencesBeijing 100101China Yunnan Key Laboratory of Plateau Fish Breeding Kunming Institute of ZoologyChinese Academy of SciencesKunming Yunnan 650223China

The systematics of Semisulcospiridae in China is revised here based on morphological characters and mitochondrial phylogenetics. Phylogenetic relationships within the Chinese semisulcospirids were assessed via DNA sequences from mitochondrial analysis (cytochrome c oxidase I and 16S rRNA). This research contains most morphospecies of semisulcospirids previously recorded in China. Based on these results, the family of Chinese Semisulcospiridae is represented by three genera: i.e., viviparous Semisulcospira B?ttger, 1886, oviparous Hua Chen, 1943 and Koreoleptoxis Burch and jung, 1988. These genera can be distinguished from each other by reproductive anatomy, reproductive mode, and radula features. Species of Hua are mainly distributed in southwest China and Guangxi, whereas Koreoleptoxis and Semisulcospira are mainly distributed in south and northeast China.

关键词： Phylogeny China Semisulcospira Hua Koreoleptoxis

Preparation and characterization of hollow carambola-shaped silver sulfide microspheres using a microwave-assisted template-free method

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Chinese Chemical Letters 2016年第3期27卷 451-453页

作者： Wei Su Rong Li Yan-jun xing College of Chemistry. Chemical Engineering and Biotechnology of Donghua University Shanghai 201620. China National Engineering Research Center for Dyeing & Finishing of Textiles Shanghai 201620 China

A simple and convenient method, free of template, has been proposed to synthesize hollow carambolashaped Ag2 S microspheres with Ag NO3, thiourea（TU）, Na Cl and diethanolamine as reagents using a microwave-assisted method, at low temperatures of below 100 ℃. Powder X-ray diffraction（XRD）,scanning electron microscopy（FESEM） and high resolution transmission electron microscopy（HRTEM）were employed to characterize the morphology and composition of those microspheres. The results indicated that the hollow carambola-shaped silver sulfide microspheres（with high purity and homogeneous morphology） were prepared by an Ostwald ripening process. A possible formation mechanism of hollow carambola-shaped Ag2 S microspheres was proposed.

关键词： Silver sulfide Hollow carambola-shaped Microwave-assisted method Template-free

Root-Induced Changes of pH, Eh, Fe(Ⅱ) and Fractions of Pb and Zn in Rhizosphere Soils of Four Wetland Plants with Different Radial Oxygen Losses

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Pedosphere 2012年第4期22卷 518-527页

作者： YANG jun-xing LIU Yong YE Zhi-Hong Laboratory of Environmental Remediation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101(China) State Key Laboratory for Bio-control and Guangdong Key Laboratory of Plant Resources School of Life SciencesSun Yat-sen UniversityGuangzhou 510006(China) South China Sea Fisheries Research Institute Chinese Academy of Fishery SciencesGuangzhou 510300(China)

A rhizobox experiment was conducted to compare iron （Fe） oxidation and changes of pH, redox potential （Eh） and fractions of zinc （Zn） and lead （Pb） in rhizosphere and non-rhizosphere soils of four emergent-rooted wetland plants （Echinodorus macrophyllus, Eleocharis geniculata, Hydrocotyle vulgaris and Veronica serpyllifolia） with different radial oxygen loss （ROL） from roots. The results indicated that all these wetland plants decreased pH and concentration of Fe（II） but increased the Eh in the rhizosphere soils. Pb and Zn were transformed from unstable fractions to more stable fractions in the rhizosphere soils, so decreasing their potential metal mobility factors （MF）. Among the four plants, E. macrophyllus, with the highest ROL and root biomass, possessed the greatest ability in formation of Fe plaque and in the reduction of heavy metal MFs in the rhizosphere soil. Wetland plants, with higher ROLs and root biomass, may thus be effective in decreasing potential long-term heavy metal bioavailabilities.

关键词： heavy metal iron oxidation mobility factor plaque rhizobox

Hydrolysis kinetics of atrazine and influence factors

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Journal of Environmental Sciences 2001年第1期13卷 99-103页

作者： LEI Zhi-fang YE Chang-ming WANG xing-jun Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China

The hydrolysis kinetics of atrazine in distilled water and leaching water from soil, and they influence factors were studied by incubation at 35degreesC and HPLC analysis method. The kinetic process of atrazine hydrolysis can be described by the first-order reaction law. The results showed that the hydrolysis rate constants k in leaching water and distilled water were 1.606 x 10(-3)/d and 1.055 x 10(-3)/d, respectively; the half-life of atrazine hydrolysis in distilled water at pH 3, pH 4.5 and pH 8 were 373 days, 522 days and 657 days respectively. The results also showed that the proton in reaction solution can catalyze the atrazine hydrolysis; humic acid and NH4+ etc. substances in aqueous solution can facilitate atrazine hydrolysis; rate constants of atrazine hydrolysis with humic acid and NH4NO3 were 2.431 X 10(-3)/d and 1.498 X 10(-3)/d respectively which were 2.3 and 1.42 times of control(1.055 X 10(-3)/d); anion NO3- can inhibit catalysis of humic acid to atrazine hydrolysis.

关键词： atrazine hydrolysis kinetics influence factors