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PREPARATION OF POLYIMIDE-BaTiO3 HYBRID FILMS BY A DISPERSION PROCESS AND THEIR MICROSTRUCTURE

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Chinese Journal of Polymer Science 2001年第1期19卷 13-17页

作者： Yue-sheng Li Yue-jin Tong kai Jing meng-xian Ding State Key Laboratory of Polymer Physics and Chemistry PCLCC*** Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China State Key Laboratory of Polymer Physics and Chemistry PCLCC*** Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China State Key Laboratory of Polymer Physics and Chemistry PCLCC*** Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China State Key Laboratory of Polymer Physics and Chemistry PCLCC*** Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China

Barium titanate (BaTiO3) powders with particle sizes of 30 similar to 50 nm were prepared from barium stearate, titanium alkoxides and stearic acid by stearic acid-gel method. Dispersing the agglomerate of BaTiO3 nanoparticles into poly(amic acid) solution followed by curing led to the formation of polyimide hybrid films. The hybrid films were transparent and well distributed with BaTiO3 nanoparticles when the BaTiO3 content was less than 1 wt%. Highly loaded hybrid film containing 30 wit % BaTiO3 was tough, had a smooth surface and possessed much higher dielectric and piezoelectric constants than the parent polyimide.

关键词： polyimide barium titanate nanocomposite hybrid film

Hemoglobin integrated red blood cell membrane-coated metalorganic framework nano-platform for improving the self-adaptive blood glucose management

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Nano Research 2025年第1期18卷 618-627页

作者： Shuai Wu Li Zhu Sheng Ni Xiong Zhao meng Yan Yuan Zhong Karissa Kusuma Yi Liang kaiwen Bao kai Qu xian Qin Kun Zhang Wuquan Deng Da Sun Wei Wu Key Laboratory of Biorheological Science and Technology Ministry of EducationCollege of BioengineeringChongqing UniversityChongqing 400044China Chongqing University Three Gorges Hospital Chongqing Municipality Clinical Research Center for Endocrinology and Metabolic DiseasesChongqing 404000China Institute of Life Sciences&Biomedical Collaborative Innovation Center of Zhejiang Province Wenzhou UniversityWenzhou 325035China Department of Endocrinology School of MedicineChongqing Emergency Medical CenterChongqing University Central HospitalChongqing 400014China

Diabetes,a prevalent chronic metabolic disorder,often leads to severe ***,existing treatment methods may pose life-threatening risks due to poor patient compliance and inaccurate dosing of subcutaneous insulin ***,a biomimetic red blood cell(RBC)membrane-coated glucose-responsive nanoplatform is developed for controlling insulin *** nanoplatforms with RBC membrane can prolong the half-life of nano-formulation in vivo mediated by the biomimetic immune ***,the cascade catalytic effect of glucose oxidase(GOx)encapsulated in metal-organic frameworks(MOFs)and hemoglobin(Hb)in the RBC membrane are able to not only facilitate glucose-responsive insulin release,but also eliminate the detrimental by-product hydrogen peroxide(H_(2)O_(2))resulting from the Hb mediated H_(2)O_(2)*** in vitro and in vivo studies have demonstrated the favorable glucose-responsive performances of this advanced nano-platform with a single intravenous injection maintaining blood glucose balance in Type 1 Diabetes(T1D)mice for an extended duration without the hypoglycemia ***,this biomimetic insulin delivery system is poised to function as a strategy for the intravenous insulin administration,offering a promising drug candidate for the self-adaptive long-term T1D treatment.

关键词： glucose-responsive metal-organic frameworks red blood cell membrane insulin delivery glucose oxidase hemoglobin

Improving the anti-collapse performance of water-based drilling fluids of Xinjiang Oilfield using hydrophobically modified silica nanoparticles with cationic surfactants

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Petroleum Science 2023年第3期20卷 1768-1778页

作者： He Li xian-Bin Huang Jin-Sheng Sun kai-He Lv Xu meng Zhen Zhang Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China) Ministry of Education)Qingdao266580ShandongPR China School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongPR China PetroChina Tarim Oilfield Company Korla841000XinjiangPR China

Wellbore instability,especially drilling with water-based drilling fluids(WBDFs)in complex shale for-mations,is a critical challenge for oil and gas *** purpose of this paper is to study the feasibility of using hydrophobically modified silica nanoparticle(HMN)to enhance the comprehensive performance of WBDFs in the Xinjiang Oilfield,especially the anti-collapse *** effect of HMN on the overall performance of WBDFs in the Xinjiang Oilfield,including inhibition,plugging,lu-bricity,rheology,and filtration loss,was studied with a series of *** mechanism of HMN action was studied by analyzing the changes of shale surface structure and chemical groups,wettability,and capillary *** experimental results showed that HMN could improve the performance of WBDFs in the Xinjiang Oilfeld to inhibit the hydration swelling and dispersion of *** plugging and lubrication performance of the WBDFs in the Xinjiang Oilfield were also enhanced with HMN based on the experimental *** had less impact on the rheological and filtration performance of the WBDFs in the Xinjiang *** addition,HMN significantly prevented the decrease of shale *** potential mechanism of HMN was as *** chemical composition and structure of the shale surface were altered due to the adsorption of HMN driven by electrostatic *** of the shale surface resulted in significant wettability *** capillary force of the shale was converted from a driving force of water into the interior to a *** summary,hydrophobic nanoparticles presented afavorable application potential for WBDFs.

关键词： Hydrophobic nanoparticle Wetting alteration Wellbore stability Water-based drilling fluids Shale

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自激式电感耦合等离子体光源设计及光谱分析

光谱学与光谱分析 2025年第1期45卷 66-71页

作者：卢思贤龙开红詹陈锐李明北方工业大学电气与控制工程学院北京100144 益阳职业技术学院电子与信息工程学院湖南益阳413055

电感耦合等离子体(ICP)光谱仪是一种应用范围很广的元素分析仪,主要用于元素定性与定量的分析。ICP光源是光谱仪的核心部件,它在光谱仪中扮演着至关重要的角色。目前主流的ICP光源有两种:自激式和他激式,各自具有优缺点。他激式光源电... 详细信息

电感耦合等离子体(ICP)光谱仪是一种应用范围很广的元素分析仪,主要用于元素定性与定量的分析。ICP光源是光谱仪的核心部件,它在光谱仪中扮演着至关重要的角色。目前主流的ICP光源有两种:自激式和他激式,各自具有优缺点。他激式光源电路复杂、体积庞大、阻抗匹配速度较慢、最大输出功率有限。设计了一种基于镀金工艺的高功率MOSFET和变频实现阻抗匹配的自激式ICP光源,该光源采用射频放大和阻抗匹配一体化的设计,把从负载线圈采样的频率信号f_(1)以及功率放大电路放大后的频率相位f_(0)进行相位比较,再根据两者相位差的变化,进而控制频率的变化,实现阻抗匹配;设计上采用了镀金工艺的金属化硅N通道型高功率的MOSFET实现功率放大,具有更大的功率密度、更小的体积,最大输出功率超过2400 W。对研制的ICP光源进行了电学静态测试,给出了鉴相器、压控振荡器以及功率的输出特性,验证了各电路在相应工作状态下的性能表现;同时结合光谱仪进行了包含Ba、Na和Li元素标准溶液的测试,获得了目标元素的光谱信号;另外,对获得的光谱信号进行了处理,使用了基于EEMD特征增强的方法对目标元素光谱信号进行有效增强,信号的线性决定系数(R^(2))从0.97降至0.99,相对标准偏差(RSD)从6.47%降至1.07%,增强了信号的准确性和可用性。本文所研制的自激式ICP光源,通过射频放大和阻抗匹配一体化设计缩小了体积,变频技术使阻抗匹配速度从毫秒级提升到纳秒级,镀金工艺的MOSFET技术使最大输出功率从原来的1800 W增加到2400 W,为ICP光源的进一步优化和应用奠定了基础,具有重要的科学研究和工程实践意义。

关键词：自激式ICP光源阻抗匹配光谱信号 EEMD算法

Acoustic Properties of Metal-Organic Frameworks

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Research 2021年第1期2021卷 1332-1342页

作者： Zhi-Gang Li kai Li Li-Yuan Dong Tian-meng Guo Muhammad Azeem Wei Li xian-He Bu School of Materials Science and Engineering Tianjin Key Lab of Metal and Molecule-Based Material ChemistryNankai UniversityTianjin 300350China School of Physics and Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China

Metal-organic frameworks(MOFs)have attracted significant attention in the past two decades due to their diverse physical properties and associated *** numerous advances have been made,the acoustic properties of MOFs have attracted very little ***,we systematically investigate the acoustic velocities and impedances of 19 prototypical MOFs via first-principle *** results demonstrate that these MOFs exhibit a wider range of acoustic velocities,higher anisotropy,and lower acoustic impedances than their inorganic counterparts,which are ascribed to their structural diversity and anisotropy,as well as low *** addition,the piezoelectric properties,which are intimately related to the acoustic properties,were calculated for 3 MOFs via density functional perturbation theory,which reveals that MOFs can exhibit significant piezoelectricity due to the ionic *** work provides a comprehensive study of the fundamental acoustic properties of MOFs,which could stimulate further interest in this new exciting field.

关键词： field. anisotropy impedance

The theory of early nonlinear stage of m=1 instability with locally flattened q-profile

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Matter and Radiation at Extremes 2018年第5期3卷 243-247页

作者： kai-Qi Cao xian-Qu Wang Institute of Fusion Science School of Physical Science and TechnologySouthwest Jiaotong UniversityChengduSichuan 610031China

In this paper,we analyze the modification of fast particles on the nonlinear radial displacement of m=1 internal kink mode with a shoulderlike equilibrium current *** the matching method on the solutions of the outer and inner regions,we derive the analytical form of nonlinear radial displacement in the limit of q'=q"=0,which is valid to the cases of weak shear due to a slight flattening of the q(r)profile around q=*** have taken into consideration the effects of the circulating and trapped fast particles on the nonlinear state of the *** is found that a fast particle can modify the nonlinear saturation level by the change of potential energy,depending on the fast particle *** the matching of linear dispersion relation to early nonlinear result,we also obtain the relations of radial displacement to the mode frequency and linear growth rate,and discuss the scaling for different stabilities of the MHD modes.

关键词： Tokamak Magnetohydrodynamics Weak magnetic shear Internal kink mode Fast particle

Lamellar aspect-ratio and thickness-dependent strength-ductility synergy in pure nickel during in-situ micro-tensile loading

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Journal of Materials Science & Technology 2023年第26期157卷 89-97页

作者： Zi-meng Wang Yun-Fei Jia kai-Shang Li Yong Zhang Jia-Dong Cai xian-Cheng Zhang Hiroyuki Hirakata Shan-Tung Tu Key Laboratory of Pressure Systems and Safety Ministry of EducationSchool of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghai 200237China Department of Mechanical Engineering and Science Kyoto UniversityKyoto daigaku-katsuraNishikyo-kuKyoto 615-8540Japan

In order to overcome the trade-offbetween strength and ductility in traditional metallic materials,the gradient lamellar structure was fabricated through an ultrasound-aided deep rolling technique in pure Ni with high stacking fault energy after heat *** gradient lamellar Ni was successively di-vided into three ***-situ micro-tensile tests were performed in different regions to reveal the corresponding microscopic mechanical *** characterization techniques were adopted to explore the effects of microstructural parameters and defects on mechanical *** work demonstrates that the micro-tensile sample with small lamellar thickness and large aspect ratio possesses excellent strength and ductility when the loading direction is parallel to the long side of lamellar grain *** finding is helpful to the design of metallic material microstructure with superior com-prehensive *** one hand,the reason for high strength is that the strength increases with the decrease of lamellar thickness according to the Hall-Petch ***,initial dislocation density also participates in the strengthening *** the other hand,the deformation mechanisms include dislocation slip,grain rotation,and the effects of grain boundaries on dislocations,jointly contributing to good ductility.

关键词： Lamella In-situ micro-tensile test Strength-ductility synergy Aspect ratio Grain rotation

Full-domain collaborative deployment method of multiple interference sources and evaluation of its deployment effect

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Defence Technology（防务技术） 2024年第2期32卷 572-595页

作者： Yue Wang Fuping Sun xian Wang Jinming Hao kai Xiao School of Geospatial Information The PLA Information Engineering UniversityZhengzhou 450001HenanChina

This paper realizes the full-domain collaborative deployment of multiple interference sources of the global satellite navigation system(GNSS)and evaluates the deployment effect to enhance the ability to disturb the attacker and the capability to defend the GNSS during navigation *** evaluation indicators for the jamming effect of GNSS suppressive and deceptive jamming sources are first created,their evaluation models are built,and their detection procedures are sorted out,as the basis for determining the deployment *** principles for collaboratively deploying multi-jamming sources are developed to obtain the deployment structures(including the required number,structures in demand,and corresponding positions)of three single interference sources required by collaboratively ***,simulation and hardware-in-loop testing results are presented to determine a rational configuration of the collaborative deployment of multi-jamming sources in the set situation and further realize the full-domain deployment of an interference network from ground,air to *** evaluation indices for the deployment effect are finally developed to evaluate the deployment effect of the proposed configuration and further verify its reliability and rationality.

关键词： Jamming effect Multiple interference sources Collaborative deployment Effect evaluation Defense capability

An efficient adaptive finite element method algorithm with mass conservation for analysis of liquid face seals

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2014年第3期15卷 172-184页

作者： Xiayg-kai meng Shao-xian BAI Xu-dong PENG Institute of Chemical Process Machinery Zhejiang University of Technology Hangzhou 310032 China

To improve lubrication effect and seal performance, complicated geometrical hydrodynamic grooves or patterns are often processed on end faces of liquid lubricated mechanical seals. These structures can lead to difficulties in precisely estimating the seal performance. In this study, an efficient adaptive finite element method （FEM） algorithm with mass conservation was presented, in which a streamline upwind/Petrov-Galerkin （SUPG） weighted residual FEM and a fast iteration algorithm were applied to solve the lubrication equations （Reynolds equation）. A mesh adaptation technique was utilized to refine the computation domain based on a residual posterior error estimator. Validation, applicability, and efficiency were verified by comparison among different algorithms and by case studies on seals＇ faces with different groove structures. The study investigated the influence of the order of shape function and the mesh number on the leakage balance. Mesh refinement occurred mainly in cavitation zones when cavitation happened, otherwise it occurred in regions with a high pressure gradient. Numerical experiments verified that the proposed algorithm is a fast, effective, and accurate method to simulate lubrication problems in the engineering field apart from end face seals.

关键词： Cavitation Finite element method (FEM) End face seals Streamline upwind/Petrov-Galerkin (SUPG) Massconservation