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Influence of carbon black activation on the AC electrical properties of conductive carbon black/polypropylene composites

中国矿物岩石地球化学学会第13.学术年会

作者： WU Yuan-bao~1,zheng Yong-fei~2.1.State Key Laboratory of Geological Processes and Mineral Resources,Faculty of Earth sciences,{2. {3. of Geosciences, Wuhan 43.074,{2. 2.CAS Key Laboratory of Crust-Mantle materials and Environments,school of Earth and Space sciences,{3. of science and {12. of {2.,Hefei 2.3}02.,{2.

＜正＞The Qinling-Tongbai-Dabie-Sulu orogenic belt marks the suture between the North and South china Blocks in Central china,forming one of the most important orogens in the eastern *** are hot controversies about the location and number of sutures and the timing of arc-continent and continent-continent collisions {2.ring the convergence between the North and South china *** Dabie-Sulu orogenic belt is characterized by the occurrence of Triassic UHP eclogite-facies metamorphic rocks {2.e to the Triassic continental deep sub{2.ction. Thus,the Triassic continent-continent collision is evident in east-central *** the other hand,there are Paleozoic events of arc-continent collision in the Qinling-Tongbai orogenic belt that were overprinted by the Triassic process of continental *** has caused much complexity on the time and location of arc-continent and continent-continent collisions between the North and South china *** present an

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Influence of carbon black activation on the AC electrical pr...

Dynamic Modeling and Experimental Verification of an RPR Type Compliant Paralle Mechanism with Low Orders

The Fifth china-Japan Seminar on Advanced Engineering Plastics, Polymer Alloys and Composites

作者： ding Nai-Xiu,ZHAN Mao-Sheng school of {2. {3. and Engineering,beijing university of Aeronautics and Astronautics 3.XueYuan Road,HaiDian District,beijing 100083.,PR china

Carbon black was first activated by grafting and coupling *** the grafted carbon black,coupled carbon black,together with the unmodified carbon black were filled into polypropylene to prepare three kinds of composites *** measurements of Fourier Transform Infrared Spectroscopy (FT1R) and alternating current (AC) electrical properties were performed on the *** from the result of FTIR spectra it can be found that different groups are bonded to the surface of carbon black after *** the corresponding conductive composites,it was found that the value of percolation threshold decreases and the electrical conductivity improves consequently after the carbon black *** influence of carbon black activation on the AC electrical properties of the composites and their variation with frequency was *** AC conduction mechanism was discussed and the conduction model was constructed based on the ***: AC electrical properties;Polypropylene;Carbon black;Activation;Grafting;Coupling

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Chinese Journal of Mechanical Engineering 2024年第3期37卷 83-94页

作者： Shuang Zhang Jingfang Liu Huafeng ding Yanbin Zhang school of Mechatronics Engineering Henan University of Science and TechnologyLuoyangHenanChina Faculty of materials and Manufacturing College of Mechanical Engineering and Applied Electronics TechnologyBeijing University of TechnologyBeijingChina Key laboratory of advanced manufacturing technology Beijing University of TechnologyBeijingChina school of Mechanical Engineering and Electronic Information China University of Geosciences(Wuhan)WuhanChina Center of Machinery Equipment Advanced Manufacturing of Henan Province LuoyangChina

Efficiency of calculating a dynamic response is an important point of the compliant mechanism for posture *** modeling with low orders of a 2.1T compliant parallel mechanism is studied in the *** mechanism with two out-of-plane rotational and one lifting degrees of freedom(DoFs)plays an important role in posture *** on elastic beam theory,the stiffness matrix and mass matrix of the beam element are established where the moment of inertia is *** improve solving efficiency,a dynamic model with low orders of the mechanism is established based on a modified modal synthesis ***,each branch of the RPR type mechanism is divided into a ***,a set of hypothetical modes of each substructure is obtained based on the C-B ***,dynamic equation of the whole mechanism is established by the substructure assembly.A dynamic experiment is conducted to verify the dynamic characteristics of the compliant mechanism.

关键词： Compliant parallel mechanism Dynamic model Modal synthesis method Dynamic experiment

Low-intensity pulsed ultrasound reduces alveolar bone resorption during orthodontic treatment via Lamin A/C-Yes-associated protein axis in stem cells

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World Journal of Stem Cells 2024年第3期16卷 267-286页

作者： Tong Wu Fu zheng Hong-Yi Tang Hua-Zhi Li Xin-Yu Cui Shuai ding {2.o Liu Cui-Ying Li Jiu-Hui Jiang Rui-Li Yang Department of Orthodontics Peking University School and Hospital of StomatologyNational Engineering Laboratory for Digital and Material Technology of StomatologyBeijing Key Laboratory of Digital StomatologyBeijing 100081China Department of Central Laboratory Peking University School and Hospital of StomatologyNational Clinical Research Center for Oral Diseases&National Engineering Laboratory for Digital and Material Technology of StomatologyBeijing Key Laboratory of Digital StomatologyBeijing 100081China

BACKGROUND The bone remodeling during orthodontic treatment for malocclusion often requires a long duration of around two to three years,which also may lead to some complications such as alveolar bone resorption or tooth root ***-intensity pulsed ultrasound(LIPUS),a noninvasive physical therapy,has been shown to promote bone fracture *** is also reported that LIPUS could reduce the duration of orthodontic treatment;however,how LIPUS regulates the bone metabolism during the orthodontic treatment process is still *** To investigate the effects of LIPUS on bone remodeling in an orthodontic tooth movement(OTM)model and explore the underlying *** A rat model of OTM was established,and alveolar bone remodeling and tooth movement rate were evaluated via micro-computed tomography and staining of tissue *** vitro,human bone marrow mesenchymal stem cells(hBMSCs)were isolated to detect their osteogenic differentiation potential under compression and LIPUS stimulation by quantitative reverse transcription-polymerase chain reaction,Western blot,alkaline phosphatase(ALP)staining,and Alizarin red *** expression of Yes-associated protein(YAP1),the actin cytoskeleton,and the Lamin A/C nucleoskeleton were detected with or without YAP1 small interfering RNA(siRNA)application via *** The force treatment inhibited the osteogenic differentiation potential of hBMSCs;moreover,the expression of osteogenesis markers,such as type 1 collagen(COL1),runt-related transcription factor 2.ALP,and osteocalcin(OCN),*** could rescue the osteogenic differentiation of hBMSCs with increased expression of osteogenic marker inhibited by ***,the expression of LaminA/C,F-actin,and YAP1 was downregulated after force treatment,which could be rescued by ***,the osteogenic differentiation of hBMSCs increased by LIPUS could be attenuated by YAP siRNA ***,LIPUS increased alveolar

关键词： Low-intensity pulsed ultrasound Bone resorption Osteogenesis Cytoskeleton-Lamin A/C-Yes-associated protein axis Bone marrow mesenchymal stem cells Orthodontic tooth movement

Steric hindrance modulation of hexaazatribenzanthraquinone isomers for high-capacity and wide-temperature-range aqueous proton battery

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National science Review 2024年第4期11卷 271-282页

作者： Mingsheng Yang Yuxin hao Bei Wang Yan Wang Liping zheng Rui Li Huige Ma Xinyu Wang Xiaoming Jing Hongwei Li Mengxiao Li Zhihui Wang Yujie Dai Guangcun Shan Mingjun Hu Jun Luo Jun Yang school of materials {2. and Engineering Beihang University beijing Institute of Nanoenergy &Nanosystems Chinese Academy of Sciences Center on Nanoenergy Research School of Physical Science & TechnologyGuangxi University school of Chemistry and Chemical Engineering Center on Nanoenergy Research Guangxi University school of Instrumentation science and Opto-electronics Engineering Beihang University ShenSi Lab Shenzhen Institute for Advanced StudyUniversity of Electronic Science and Technology of China

Organic materials with rich active sites are good candidates of high-capacity anodes in aqueous batteries,but commonly low utilization of active sites limits their ***,two isomers,symmetric and asymmetric hexaazatribenzanthraquinone（s-HATBAQ and a-HATBAQ）,with rich active sites have been synthesized in a controllable *** has been revealed for the first time that a sulfuric acid catalyst can facilitate the stereoselective formation of *** to the reduced steric hindrance in favor of proton insertion as well as the amorphous structure conducive to electrochemical dynamics,s-HATBAQ exhibits 1.5 times larger specific capacity than ***,the electrode of s-HATBAQ with50% reduced graphene oxide（s-HATBAQ-50%rGO） delivers a record high specific capacity of405 mAh g-1in ***,the assembled MnO2./s-HATBAQ-50%rGO aqueous proton full batteries show an exceptional cycling stability at 2.℃ and can maintain ～92. capacity after1000 cycles at 0.5 A g-1at-80℃.This work demonstrates the controllable synthesis of isomers,showcases a wide-temperature-range prototype proton battery and highlights the significance of precise mole cular structure modulation in organic energy storage.

关键词： stereoisomers steric effect aqueous battery super cycling stability ultra-low temperature proton battery

Numerical Investigation on Heat Transfer Characteristics of Microencapsulated Phase Change Material Slurry in a Rectangular Minichannel

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Journal of Thermal science 2024年第2期33卷 564-577页

作者： WANG Zhibin LI Zilong JIA Lisi ding Bin CHEN Ying school of materials and Energy Guangdong University of TechnologyGuangzhou510006China Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter Guangzhou510006China College of New Energy China University of Petroleum(East China)Qingdao266580China

Microencapsulation phase change material slurry(MEPCMS) becomes a potential working fluid for cooling high energy density miniaturized components,thanks to the latent heat absorption of particles in the heat transfer *** this work,the Discrete Phase Model(DPM) based on the Euler-Lagrangian method is used to numerically investigate the convective heat transfer characteristics of MEPCMS flowing through a rectangular minichannel with constant heat *** results show that particles of MEPCMS are mainly subjected to drag force during the *** so,they can migrate from the high-temperature region to the low-temperature region driven by the thermophoretic force,affecting the particle distribution and phase change ***,the Nux of the MEPCMS fluctuates due to particle phase change with varying specific heat ***,the value increases first,then decreases,and eventually increases again until it approaches the fully developed value of the pure base fluid as the particles gradually ***,the heat transfer performance of the MEPCMS is influenced by the combination of fluid inlet temperature fluid inlet velocity(v),and mass concentration(c_(m)) of MEPCM *** result shows that the maximum reduction of the maximum bottom wall temperature difference(ΔT_(w)) is 2.4}98% at T_(in)=2.3.15 K,v=0.15 m·s^(-1),c_(m)=10%.

关键词： Microencapsulated Phase Change Material Slurry(MPCMS) Discrete Phase Model(DPM) particle-fluid interaction force minichannel heat sink thermophoresis

An effective catalyst carrier SiO_(2.:Enhancing catalytic and combustion properties of CuFe_(2.O_(4)on energetic components

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Defence technology（防务技术） 2024年第2期32卷 383-392页

作者： Li ding Chong Wan Suhang Chen Zhao Qin Kangzhen Xu school of Chemical Engineering/Xi'an Key Laboratory of Special Energy materials Northwest UniversityXi'an710069China Xi’an Modern Chemistry Research Institute Xi'an710065China

To enhance the catalytic activity of copper ferrite(CuFe_(2.O_(4))nanoparticle and promote its application as combustion catalyst,a low-cost silicon dioxide(SiO_(2.)carrier was employed to construct a novel CuFe_(2.O_(4)/SiO_(2.binary composites via solvothermal *** phase structure,morphology and catalytic activity of CuFe_(2.O_(4)/SiO_(2.composites were studied firstly,and thermal decomposition,combustion and safety performance of ammonium perchlorate(AP)and 1,3.5-trinitroperhydro-1,3.5-triazine(RDX)with it affecting were then systematically *** results show that CuFe_(2.O_(4)/SiO_(2.composite can remarkably either advance the decomposition peak temperature of AP and RDX,or re{2.ce the apparent activation energy at their main decomposition ***,the flame propagation rate of RDX was promoted by about 2.73.times with SiO_(2.content of 3.wt%,and safety property of energetic component was also improved greatly,in which depressing the electrostatic discharge sensitivity of pure RDX by about 1.89 *** addition,the effective range of SiO_(2.carrier content in the binary catalyst is found to be 3.to 5 wt%.Therefore,SiO_(2.opens a new insight on the design of combustion catalyst carrier and will promote the application of CuFe_(2.O_(4)catalyst in solid propellant.

关键词： Copper ferrite Silicon dioxide Combustion catalyst Thermal decomposition Laser ignition

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磁悬浮飞轮用无刷直流电动机可靠性研究

微电机 2010年第2期43卷 12-16页

作者：李锴骆红云张峥韩邦成北京航空航天大学材料科学与工程学院北京100191 北京航空航天大学仪器科学与光电工程学院北京100191

针对为磁悬浮飞轮(MSFW)转子提供旋转动力的无刷直流电动机(BLDCM)进行了可靠性方面的研究。首先,建立了BLDCM的可靠性串并联模型,采用应力分析法对其可靠度进行了预计,同时分析了采用冗余控制对BLDCM可靠度的影响,分析表明在一定程度... 详细信息

针对为磁悬浮飞轮(MSFW)转子提供旋转动力的无刷直流电动机(BLDCM)进行了可靠性方面的研究。首先,建立了BLDCM的可靠性串并联模型,采用应力分析法对其可靠度进行了预计,同时分析了采用冗余控制对BLDCM可靠度的影响,分析表明在一定程度上可以认为控制冗余延长了BLD-CM的使用寿命。其次,根据MSFW运行测试的状况,建立了BLDCM的故障树,进行了BLDCM的故障模式与影响分析,最后提出了提高MSFW用BLDCM可靠性的建议,对MSFW的工程应用具有一定的实用价值。

关键词： BLDCM 可靠性分析故障树故障模式与影响分析

Evidence for reversible oxygen ion movement during electrical pulsing:enabler of emerging ferroelectricity in binary oxides

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materials Futures 2024年第3期3卷 195-205页

作者： Huan Liu Fei Yu Bing Chen zheng-Dong Luo Jiajia Chen Yong Zhang Ze Feng Hong Dong Xiao Yu Yan Liu Genquan Han Yue hao State Key Discipline Laboratory of Wide Band Gap Semiconductor technology School of MicroelectronicsXidian UniversityXi’an 710071People’s Republic of China Research Center for Intelligent Chips and Devices Zhejiang LabHangzhou 311121People’s Republic of China Engineering Research Center of Thin Film Optoelectronics technology Ministry of EducationNankai UniversityTianjin 300350People’s Republic of China

Ferroelectric HfO_(2.-based materials and devices show promising potential for applications in information technology but face challenges with inadequate electrostatic control,degraded reliability,and serious variation in effective oxide thickness *** demonstrate a novel interface-type switching strategy to realize ferroelectric characteristics in atomic-scale amorphous binary oxide films,which are formed in oxygen-deficient conditions by atomic layer deposition at low *** approach can avoid the shortcomings of reliability degradation and gate leakage increment in scaling polycrystalline doped HfO_(2.-based *** theoretical modeling and experimental characterization,we show the following.(1)Emerging ferroelectricity exists in ultrathin oxide systems as a result of microscopic ion migration {2.ring the switching process.(2.These ferroelectric binary oxide films are governed by an interface-limited switching mechanism,which can be attributed to oxygen vacancy migration and surface defects related to electron(de)trapping.(3.Transistors featuring ultrathin amorphous dielectrics,used for non-volatile memory applications with an operating voltage re{2.ced to±1 V,have also been experimentally *** findings suggest that this strategy is a promising approach to realizing next-generation complementary metal-oxide semicon{2.ctors with scalable ferroelectric materials.

关键词： ferroelectric binary oxide mobile ion amorphous dielectric nonvolatile memory