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Dielectric nanocomposites with superb high-temperature capacitive performance based on high intrinsic dielectric constant polymer

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Nano Research 2024年第9期17卷 8504-8512页

作者： Ding Ai yuan Chang haoliang Liu Chenglong Wu Yao Zhou yuting Han hao yu Bing Xiao Yonghong Cheng Guanglei Wu Zirui Jia State Key Laboratory of Electrical Insulation and Power Equipment School of Electrical EngineeringXi’an Jiaotong UniversityXi’an 710049China Institute of Materials for Energy and Environment State Key Laboratory of Bio-Fibers and Eco-TextilesCollege of Materials Science and EngineeringQingdao UniversityQingdao 266071China

Advancements in power electronics necessitate dielectric polymer films capable of operating at high temperatures and possessing high energy *** significant strides have been achieved by integrating inorganic fillers into high-temperature polymer matrices,the inherently low dielectric constants of these matrices have tempered the magnitude of *** this work,we report an innovative nanocomposite based on sulfonylated polyimide(SPI),distinguished by the incorporation of sulfonyl groups within the SPI backbone and the inclusion of wide bandgap hafnium dioxide(HfO_(2))*** nanocomposite has demonstrated notable enhancements in thermal stability,dielectric properties,and capacitive performance at elevated *** simulations at both molecular and mesoscopic levels have elucidated the mechanisms behind these improvements,which could be attributed to confined segmental motion,an optimized electronic band structure,and a diminished incidence of dielectric breakdown ascribed to the presence of sulfonyl ***,the SPI-HfO_(2)nanocomposite demonstrates a high charge-discharge efficiency of 95.7%at an elevated temperature of 150℃and an applied electric field of 200 MV/***,it achieves a maximum discharged energy density of 2.71 J/cm^(3),signalling its substantial potential for energy storage applications under extreme conditions.

关键词： dielectric polymer nanocomposites high-temperature high dielectric constant sulfonyl groups energy storage performance

Experimental and simulation investigation into the cause and treatment of rail corrugation for metro

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Journal of Central South University 2022年第12期29卷 3925-3938页

作者： TANG Xue-yang CAI Xiao-pei peng Hua MA Chao-zhi CHANG Wen-hao YAO yu-fei School of Civil Engineering Beijing Jiaotong UniversityBeijing 100044China

The cause and treatment of rail corrugation for the metro have always been a popular and challenging issue. In this work, the field measurements were carried out on rail corrugation, track stiffness, and the track dynamic response. A three-dimensional finite element model was developed to investigate the cause of rail corrugation. The constraints on rail vibration from two wheelsets and adjacent wheel-rail interactions were taken into account in the model. According to experimental and simulation results, the suppression measure for rail corrugation was proposed and the suppression mechanism was discussed. It was found that the cause of rail corrugation is related to vertical and lateral vibration of the rails outside the two wheelsets at around 380 Hz. The increased stiffness of the fasteners reduces the vibration energy of the rail and the wheel-rail force. However, simply increasing the stiffness of the fasteners may not be effective in the suppression of rail corrugation. If necessary, the rails need to be grinded to reduce the roughness to a certain level, so that increasing the fastener stiffness can effectively suppress the rail corrugation.

关键词： rail corrugation modal analysis field measurement fastener stiffness finite element model

Alterations of DNA damage response pathway:Biomarker and therapeutic strategy for cancer immunotherapy

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Acta Pharmaceutica Sinica B 2021年第10期11卷 2983-2994页

作者： Minlin Jiang Keyi Jia Lei Wang Wei Li Bin Chen yu Liu hao Wang Sha Zhao Yayi He Caicun Zhou Department of Medical Oncology Shanghai Pulmonary HospitalTongji University Medical School Cancer InstituteTongji University School of MedicineShanghai 200433China Medical School Tongji UniversityShanghai 200433China

Genomic instability remains an enabling feature of cancer and promotes malignant *** of DNA damage response(DDR)pathways allow genomic instability,generate neoantigens,upregulate the expression of programmed death ligand 1(PD-L1)and interact with signaling such as cyclic GMPe AMP synthase-stimulator of interferon genes(cGASe STING)***,we review the basic knowledge of DDR pathways,mechanisms of genomic instability induced by DDR alterations,impacts of DDR alterations on immune system,and the potential applications of DDR alterations as biomarkers and therapeutic targets in cancer immunotherapy.

关键词： DNA damage response DNA repair Immunotherapy Genomic instability Tumor microenvironment PD-1 PD-L1 cGASe STING

Mapping the elastic properties of two-dimensional MoS_(2) via bimodal atomic force microscopy and finite element simulation

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npj Computational Materials 2018年第1期4卷 246-253页

作者： yuhao Li Chuanbin yu Yingye Gan peng Jiang Junxi yu yun Ou Dai-Feng Zou Cheng Huang Jiahong Wang Tingting Jia Qian Luo Xue-Feng yu Huijuan Zhao Cun-Fa Gao Jiangyu Li State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics&AstronauticsNanjing 210016 JiangsuChina Shenzhen Key Laboratory of Nanobiomechanics Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen518055 GuangdongChina Department of Mechanical Engineering Clemson UniversityClemsonSC 29634-0921USA Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education School of Materials Science and EngineeringXiangtan UniversityXiangtan 411105 HunanChina Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment Hunan University of Science and TechnologyXiangtan 411201 HunanChina School of Physics and Electronic Science Hunan University of Science and TechnologyXiangtan 411201 HunanChina Institute of Biomedicine and Biotechnology Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055 GuangdongChina Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen 518055 GuangdongChina Department of Mechanical Engineering University of WashingtonSeattleWA 98195USA

Elasticity is a fundamental mechanical property of two-dimensional(2D)materials,and is critical for their application as well as for strain ***,accurate measurement of the elastic modulus of 2D materials remains a challenge,and the conventional suspension method suffers from a number of *** this work,we demonstrate a method to map the in-plane Young’s modulus of mono-and bi-layer MoS_(2) on a substrate with high spatial *** atomic force microscopy is used to accurately map the effective spring constant between the microscope tip and sample,and a finite element method is developed to quantitatively account for the effect of substrate stiffness on *** these methods,the in-plane Young’s modulus of monolayer MoS_(2) can be decoupled from the substrate and determined as 265±13 GPa,broadly consistent with previous reports though with substantially smaller *** is also found that the elasticity of mono-and bi-layer MoS_(2) cannot be differentiated,which is confirmed by the first principles *** method provides a convenient,robust and accurate means to map the in-plane Young’s modulus of 2D materials on a substrate.

关键词： modulus modal element

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扭矩平衡式水下机器人推进器研究

船舶力学 2009年第2期13卷 210-216页

作者：蔡昊鹏苏玉民哈尔滨工程大学船舶工程学院哈尔滨150001

某些水下机器人横向尺度较小,往往与其主推螺旋桨直径处于同一量级;螺旋桨旋转所带来的扭矩会使机器人产生明显的横倾;所以,在水下机器人的推进器设计过程中就必须考虑保持机器人的纵向稳定性。该文就此问题提出了一种集成式扭矩平衡推... 详细信息

某些水下机器人横向尺度较小,往往与其主推螺旋桨直径处于同一量级;螺旋桨旋转所带来的扭矩会使机器人产生明显的横倾;所以,在水下机器人的推进器设计过程中就必须考虑保持机器人的纵向稳定性。该文就此问题提出了一种集成式扭矩平衡推进器,该推进器利用与保护导管相连的后置定子产生反扭矩来平衡螺旋桨旋转产生的扭矩,导管、导管支架、定子与驱动主机集成为一体,推进器整体无扭矩输出,通用性强。此后给出了推进器的理论设计方法及过程,应用面元法理论对所设计推进器进行了水动力性能计算分析。最后讨论了定子各参数对推进器性能的影响。

关键词：扭矩平衡集成式推进器面元法后置定子推进器设计

Preliminary study on a single balloon cross-midline expansion via unipedicular approach in kyphoplasty

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Chinese Medical Journal 2008年第18期121卷 1811-1814页

作者： SUN Gang JIN peng LI Fan-dong LIU Xun-wei hao Run-song YI yu-hai XIE Zhi-yong Department of Medical Imaging Jinan Military General Hospital of People's Liberation Army Jinan Shandong 250031 China

Background Recently, bilateral transpedicular kyphoplasty with a single balloon was performed for osteoporotic vertebral body compression fractures （OVCFs） to reduce the fees of the operation, but the time of operation and radiation exposure are longer. The aim of this study was to determine the safety and effectiveness of a single balloon cross-midline expansion via unipedicular approach in kyphoplasty for OVCFs. Methods Thirty-six patients with painful OVCFs （61 vertebrae） were enrolled in this research. Unilateral transpedicular puncture was performed under the fluoroscopy monitoring of an oblique angle down the pedicle. A single balloon was introduced through unipedicular approach, The final balloon position was in the midline of the vertebral body with the balloon cross-midline expansion and bone cement filled. Clinical outcomes were determined by comparison of the preoperative and postoperative visual analogue scale （VAS） and Oswestry disability index （ODI）. Radiographic assessment included restoration of vertebral height and correction of kyphosis. Follow-up was conducted for 6-12 months （mean 9.2 months）. Results Thirty-six consecutive patients with 61 vertebrae were successfully operated on with a mean operation time of 37.4 minutes per vertebra. All patients had dramatic pain relief and functional recovery within 96 hours after the procedure with no surgery or device-related complications. VAS score improved from 7.27±1.02 preoperatively to 2.71±0.75 postoperatively （P 〈0.01）. ODI score was decreased from （71.14±10.94）% preoperatively to （26.56±6.35）% postoperatively. The average loss of anterior body height was （14.33±2.76） mm before procedure and （10.03±1.83） mm after procedure （P 〈0.01）, while the average loss of middle body height was （10.15±2.70） mm before procedure and （5.89±1.83） mm after procedure （P 〈0.01）. The kyphotic deformity was corrected from （23.43±5.00） degree to （16.16±2.77） degree （P 〈0.01）. The pain relief and functional recovery were s

关键词： radiology, interventional kyphoplasty osteoporosis spinal fractures

An Improvement of Herbrand's Theorem and Its Application to Model Generation Theorem Proving

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Journal of Computer Science & Technology 2007年第4期22卷 541-553页

作者： yu-Yan Chao Li-Feng He Tsuyoshi Zheng-hao Shi Kenji Suzuki Hidenori Itoh Graduate School of Environment Management Nagoya Sangyo University AichiJapan College of Mechanical and Electrical Engineering Shaanxi University of Science and TechnologyChina Graduate School of Information Science and Technology Aichi Prefectural UniversityAichiJapan College of Computer and Information Engineering Shaanxi University of Science and TechnologyChina Graduate School of Computer Science and Engineering Nagoya Institute of TechnologyNagoyaJapan Department of Radiology The University of ChicagoChicagoU.S.A. Research Associate The University of ChicagoUSA.

This paper presents an improvement of Herbrand's *** propose a method for specifying a subuniverse of the Herbrand universe of a clause set S for each argument of predicate symbols and function symbols in *** prove that a clause set S is unsatisfiable if and only if there is a finite unsatisfiable set of ground instances of clauses of S that are derived by only instantiating each variable,which appears as an argument of predicate symbols or function symbols,in S over its corresponding argument's sub-universe of the Herbrand universe of *** such sub-universes are usually smaller(sometimes considerably)than the Herbrand universe of S,the number of ground instances may decrease considerably in many *** present an algorithm for automatically deriving the sub-universes for arguments in a given clause set,and show the correctness of our ***,we introduce an application of our approach to model generation theorem proving for non-range-restricted problems,show the range-restriction transformation algorithm based on our improvement and provide examples on benchmark problems to demonstrate the power of our approach.

关键词： Herbrand's theorem Herbrand universe model generation theorem proving SATCHMO really non-propositional

Molecular Structures and Catalytical Performance in Suzuki-coupling Reaction of Novel Dipalladium Clip-shaped Complexes with Bifunctional Pyrazolate Ligands

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Chinese Journal of Structural Chemistry 2021年第7期40卷 843-850,837页

作者： HU Xiao-peng WANG Zhi-Feng DENG Wei TONG Jin yu Shu-Yan Laboratory fdr Self-assembly Chemistry Center of Excellence for Environmental Safety and Biological EffectsBeijing Key Laboratory for Green Catalysis and SeparationDepartment of Environment and LifeBeijing University of TechnologyBeijing 100124China

A series of clip-shaped cationic molecular corners C1~C4(C1=[(bpy)_(2)Pd_(2)(L^(1))_(2)]^(2+),C2=[(dmbpy)_(2)Pd_(2)(L^(1))_(2)]^(2+),C3=(bpy)_(2)Pd_(2)(L^(2))_(2)]^(2+),C4=(dmbpy)_(2)Pd_(2)(L^(2))_(2)]^(2+),bpy=2,2-bipyridine,dmbpy=4,4΄-dimethyl-2,2-bipyridine)were synthesized through dipalladium complexes[(bpy)_(2)Pd_(2)(NO_(3))_(2)](NO_(3))_(2),[(dmbpy)_(2)Pd_(2)(NO_(3))_(2)](NO_(3))_(2)and bifunctional pyrazole ligands 4-(3,4-dimethoxyphenyl)-3,5-dimethyl-1H-pyrazol(HL^(1))and 4,4΄-(5-(^(1)H-pyrazol-4-yl)-1,3-phenylene)dipyridine(HL^(2)).Complexes C1~C4 were characterized by^(1)H and^(13)C NMR,electrospray ionization mass spectrometry(ESI-MS),elemental analysis,and IR *** X-ray diffraction analysis of C1∙2NO_(3)−revealed a Pd_(2)dimetallic clip-shaped structure which was synthesized by two bifunctional ligands doubly bridged by the[(bpy)Pd]_(2)dimetal ***,all of the complexes with NO_(3)−as counter anions exhibited high-efficiency catalytical performance in the Suzuki-coupling reaction attributed to the tunable impact and weak dinuclear Pd(Ⅱ)···Pd(Ⅱ)intramolecular bonding interaction.

关键词： dipalladium supra molecules bifunctional pyrazolate ligands catalysis Suzuki-coupling reaction

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Accumulation of cadmium and copper by female Oxya chinensis (Orthopera: Acridoidea) in soil-plant-insect system

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Journal of Environmental Sciences 2006年第2期18卷 341-346页

作者： LI Li-jun LIU Xue-mei DUAN Yi-hao GUO Ya-ping CHENG Bin GUO Jun XI yu-ying MA En-bo Institution of Soil Science and Fertilizer Shanxi Academy of Agriculture Sciences Taiyuan 030031 China College of Life Science and Technology Shanxi University Taiyuan 030006 China School of Environmental Science and Resources Taiyuan 030006 China

One purpose of this research is to present accumulation of cadmium （Cd） and copper （Cu） by female Oxya chinensis （Orthopera： Acridoidea） in a simulated soil-plant-insect ecosystem treated with Cd. Fourth-instar nymphs of O. chinensis had been fed on wheat （Triticurn aestivum） seedlings contaminated with Cd and Cu for one month. In the ecosystem, the Cd concentration in wheat seedlings rose greatly with the increasing of Cd in the soil, but the Cu concentration in wheat seedlings was not found elevated. There was a highly significant difference（P〈0.05） in Cd concentrations of wheat seedlings and not any significant difference（P〉0.05） in Cu concentrations of wheat seedlings. The Cd and Cu concentration in different body part-head, thorax, abdomen, and hind femur, varied under different Cd concentrations in soil. There were significant differences （P〈0.05） in the four parts of Cd and Cu accumulations with all treatments. The order of Cd accumulation was thorax 〉abdomen 〉head 〉hind femur and the Cu was abdomen 〉thorax 〉 head〉hind femur. The results indicated that Cd and Cu were accumulated from the soil to grasshoppers through the plant; that is to say, Cd and Cu in environment could be transported to animal or human via food chain.

关键词： accumulation cadmium(Cd) copper(Cu) grasshopper(Oxya chinensisi) soil-plant-insect ecosystem