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Effects of Functionalized Graphenes on the Isothermal Crystallization of Poly(L-lactide) Nanocomposites

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Chinese Journal of Polymer Science 2016年第1期34卷 111-121页

作者：赵丽芬 qi Li ru-liang Zhang Xiu-juan Tian Lei Liu School of Materials Science and Engineering Shandong University of Science and Technology

The effects of graphene oxide（GO） with polar groups and functionalized GO（f GO） with nonpolar groups on the isothermal crystallization of poly（L-lactide）（PLLA） were compared. Functionalized GO was obtained by grafting octadecylamine and characterized by FTIR, WAXD and TGA. Isothermal crystallization kinetics of PLLA/GO and PLLA/f GO nanocomposites were investigated by combining DSC data and Avrami equation. The results showed that f GO could improve PLLA crystallization rate more obviously than GO. By analyzing the morphology obtained from POM, SEM and TEM, it was found f GO with large layer space dispersed better in PLLA and supplied more nucleation sites than GO. Therefore, for the multilayer graphene, increasing the layer spaces is important to improve its dispersion in polymers, which will cause the crystal kinetics changing of polymers.

关键词： Crystallization Graphene oxide Poly(L-lactide)

Intra-provincial Revenue Sharing and the Subnational Government＇s Fiscal Capacity in China The Case of Zhejiang Province

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China & World Economy 2018年第4期26卷 24-40页

作者： Tao qian qi Zhang Associate Professor China Academy of West Region Development Zhejiang University China Associate Professor China Center for Economic Studies School of Economics Fudan University China

This study investigates whether the tax-sharing system has deteriorated the fiscal capacity of subnational governments by analyzing how fiscal revenues are divided between provincial and sub-provincial data J？om Zhejiang Province in China governments. Our study of county-level fiscal during 1994-2007 shows that intra-provincial revenue-sharing rules favor county governments in two ways：（i） they improve county governments ＇fiscal autonomy in terms of using their own revenues; and （ii） they enhance county governments ＇fiscal capacity through province-to-county general tran^Jers. In addition, we find that intra-provincial fiscal revenue-sharing rules and transJers reduce [iscal dist^aritv between counties.

关键词： fiscal capacity intra-provincial fiscal system local government

Theoretical investigation of hierarchical sub-wavelength photonic structures fabricated using high-order waveguide-mode interference lithograph

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Chinese Physics B 2017年第2期26卷 213-217页

作者： ru Wang Xiangxian Wang Hua Yang Yunping qi School of Science Lanzhou University of Technology Lanzhou 730050 China College of Physics and Electronic Engineering Northwest Normal University Lanzhou 730070 China

This paper presents the theoretical investigation of hierarchical sub-wavelength photonic structures with various periods and numbers of layers, which were fabricated using a high-order waveguide-mode interference field. A 442-nm laser was used to excite high-order waveguide modes in an asymmetric metal-cladding dielectric waveguide structure. The dispersion curve of the waveguide modes was theoretically analyzed, and the distribution of the interference field of high-order waveguide modes was numerically simulated using the finite-element method. The various dependences of the characteristics of hierarchical sub-wavelength photonic structures on the thickness and refractive index of the photoresist and the waveguide mode were investigated in detail. These hierarchical sub-wavelength photonic structures have various periods and numbers of layers and can be fabricated by a simple and low-cost method.

关键词： sub-wavelength photonic structure finite-element method waveguide modes lithography

Single Particle-Based Confocal Laser Scanning Microscopy for Visual Detection of Copper Ions in Confined Space

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Chinese Journal of Chemistry 2021年第7期39卷 1804-1810页

作者： Ke Wang Manping qian Honglan qi qiang Gao Chengxiao Zhang Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province School of Chemistry and Chemical EngineeringShaanxi Normal UniversityXi'anShaanxi 710062China

Main observation and conclusion A single particle-based confocal laser scanning microscopy was developed for the visual detection of copper ions in confined space.A fluorescence microparticle,named AuNCs/ZIF-8,was syn... 详细信息

关键词： Metal-organic frameworks Fluorescence Sensors Single particle Confocal laser scanning microscopy

Column-orthogonal designs with multi-dimensional stratifications

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Science China Mathematics 2021年第6期64卷 1291-1304页

作者： Xue Yang Jian-Feng Yang Min-qian Liu qi Zhou School of Statistics Tianjin University of Finance and EconomicsTianjin 300222China School of Statistics and Data Science LPMC&KLMDASRNankai UniversityTianjin 300071China

The orthogonal Latin hypercube design and its relaxation,and column-orthogonal design,are two kinds of orthogonal designs for computer ***,they usually do not achieve maximum stratifications in multi-dimensional *** this paper,we propose some methods to construct column-orthogonal designs with multi-dimensional stratifications by rotating symmetric and asymmetric orthogonal *** newly constructed column-orthogonal designs ensure that the estimates of all linear effects are uncorrelated with each other and even uncorrelated with the estimates of all second-order effects(quadratic effects and bilinear effects)when the rotated orthogonal arrays have strength larger than *** orthogonality,the resulting designs also preserve better space-filling properties than those constructed by using the existing *** addition,we provide a method to construct a new class of orthogonal Latin hypercube designs with multi-dimensional stratifications by rotating regular factorial *** newly constructed orthogonal Latin hypercube designs are tabulated for practical use.

关键词： computer experiment Latin hypercube design orthogonal array orthogonality rotation matrix

Structured trajectory planning of collision-free lane change using the vehicle-driver integration data

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Science China(Technological Sciences) 2016年第5期59卷 825-831页

作者： WANG Jiang Feng ZHANG qian ZHANG Zhi qi YAN Xue Dong MOE Key Laboratory for Urban Transportation Complex Systems Theory and Technology Beijing Jiaotong University

In this paper, the structured trajectory planning of lane change in collision-free road environment is studied and validated using the vehicle-driver integration data, and a new trajectory planning model for lane change is proposed based on linear offset and sine function to balance driver comfort and vehicle dynamics. The trajectory curvature of the proposed model is continuous without mutation, and the zero-based curvature at the starting and end points during lane change assures the motion direction of end points in parallel with the lane line. The field experiment are designed to collect the vehicle-driver integration data, such as steering angle, brake pedal angel and accelerator pedal angel. The correction Correlation analysis of lane-changing maneuver and influencing variables is conducted to obtain the significant variables that can be used to calibrate and test the proposed model. The results demonstrate that vehicle velocity and Y-axis acceleration have significant effects on the lane-changing maneuver, so that the model recalibrated by the samples of different velocity ranges and Y-axis accelerations has better fitted performance compared with the model calibrated by the sample trajectory. In addition, the proposed model presents a decreasing tendency of the lane change trajectory fitted MAE with the increase of time span of calibrating samples at the starting stage.

关键词： intelligent vehicle lane change trajectory planning vehicle-driver integration

Comparative analysis of trade effects of anti-dumping measures targeting China *** initiated by China

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China Finance and Economic Review 2015年第3期4卷 24-39页

作者： qi Junyan Sun qian Tianjin University of Finance and Economics TianjinChina

Using the numbers of anti-dumping cases both in China and around the world, the value of imports and exports from 1995 to 2012, and the anti-dumping index (ADI) proposed by Finger and Murray in 1999, this paper analyzes the characteristics of anti-dumping measures that target China and those imposed by China, and constructs a multiple linear regression model. We try to show the effect of anti-dumping measures in either direction on the total value of China’s trade. This paper finds that both have great impact on export trade value. The intensity of the level of anti-dumping measures to which China is subject is positively correlated with total export value since this intensity, to a certain degree, can promote China’s industrial upgrading and the increase of the export of high value-added products. This paper further analyzes different effects of anti-dumping measures based on the method of technological content classification of Lall (2000). Finally, we put forward policy suggestions on how to enhance China’s export competitiveness by overcoming the effects of antidumping measures to which we are subject and by making proper use of antidumping measures on others.

关键词： anti-dumping measures targeting China anti-dumping measures initiated by China technological content in export

Influence of tectonic preservation conditions on the nanopore structure of shale reservoir:A case study of Wufeng-Longmaxi Formation shale in western Hubei area,south China

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Petroleum Science 2024年第4期21卷 2203-2217页

作者： Meng Xiang Shang Xu Ya-ru Wen qi-Yang Gou Bing-Chang Liu National Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao266580ShandongChina Hubei Key Laboratory of Resources and Eco-environment Geology Hubei Geological SurveyWuhan430034HubeiChina Key Laboratory of Tectonics and Petroleum Resources Ministry of EducationChina University of GeosciencesWuhan430074HubeiChina

Tectonism is one of the dominant factors affecting the shale pore ***,the control of shale pore structure by tectonic movements is still controversial,which limits the research progress of shale gas accumulation mechanism in the complex tectonic region of southern *** this study,34 samples were collected from two exploratory wells located in different tectonic *** experiments,e.g.,organic geochemistry,XRD analysis,FE-SEM,low-pressure gas adsorption,and high-pressure mercury intrusion,were conducted to fully characterize the shale *** TOC,Ro,and mineral composition of the shale samples between the two wells are similar,which reflects that the shale samples of the two wells have proximate pores-generating capacity and pores-supporting ***,the pore characteristics of shale samples from two wells are significantly *** with the stabilized zone shale,the porosity,pore volume,and specific surface area of the deformed zone shale were reduced by 60.61%,64.85%,and 27.81%,***,the macroscopic and fine pores were reduced by 54.01%and 84.95%,*** activity and uplift denudation are not conducive to pore preservation,and the rigid basement of Huangling uplift can promote pore *** three factors are important reasons for controlling the difference in pore structure between two wells *** established a conceptual model of shale pores evolution under different tectonic preservation *** study is significant to clarify the scale of shale gas formation and enrichment in complex tectonic regions,and helps in the selection of shale sweet spots.

关键词： Shale gas Pore structure Tectonic preservation conditions Shale gas enrichment mechanism

A self-healing liquid metal anode for lithium-ion batteries

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Journal of Energy Chemistry 2022年第9期31卷 522-531,I0015页

作者： Yaqin qi Chao Shen qian Hou Zengying Ren Ting Jin Keyu Xie State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene(NPU)Xi’an 710072ShaanxiChina Research&Development Institute of Northwestern Polytechnical University in Shenzhen Northwestern Polytechnical UniversityShenzhen 518057GuangdongChina

The gallium-based liquid metal as one of the self-healing materials has gained wide attention, especially in the energy storage system. However, volume expansion with the ‘‘liquid-solid-liquid”transformation process still leads to un-controlled electrode failure, which stimulates the irreversibility of liquid metal and hinders their self-healing effect as the anode for lithium-ion batteries. Herein, the polypyrrole(PPy) with highly conductive and adhesive features is first introduced to fasten the liquid metal nanoparticles(gallium-tin alloy, EGaSn) in the integrated electrode and applied as the anode for lithium-ion batteries. A tightly PPy wrapped EGaSn nanoparticles structure is formed during the in-situ polymerization synthesis process, which effectively avoids the detachment of solid alloyed products. Based on the features of PPy, polyacrylic acid is added to facilitate strengthening the integrity of the electrode by constructing the hydrogen bond. The ‘‘dual-insurance” design endows the EGaSn to exhibit superior electrochemical kinetics and an astonishing self-healing effect. As a result, the customized anode displays superior cycling stability(499.8 mAh g^(-1) after 500 cycles at 1.0 A g^(-1))and rate capability(350 mAh g^(-1) at 2.0 A g^(-1)).This work enriches the electrode engineering technology of liquid metal nanoparticles and opens up a new way to customize the self-healing anode for lithium-ion batteries.

关键词： Liquid metal Self-healing Polypyrrole Li-ion battery Stability