检索结果-内蒙古大学图书馆

New advances in fiber-reinforced composite honeycomb materials

science China(Technological sciences) 2020年第8期63卷 1348-1370页

作者： WEI XingYu XIONG Jian WANG Jie XU Wu Center for Composite Materials and Structures Harbin Institute of TechnologyHarbin 150001China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China Shanghai Aircraft Design and Research Institute Shanghai 201210China School of Aeronautics and Astronautics Shanghai Jiao Tong UniversityShanghai 200240China

In sandwich structures,lightweight cellular materials as the core hold the face sheets far away from the neutral axis to maximize the bending performance of the *** materials as a major type of lightweight cellular materials have been widely applied in various fields,including aerospace,vehicle,marine,architecture and mechanical engineering,due to reliable mechanical properties and excellent *** fiber-reinforced composites is an efficient method to develop ultralight honeycomb materials with superior mechanical *** recent years,fiber-reinforced composite honeycomb materials possessing lightweight and excellent mechanical performances have attracted noticeable attention to replacing traditional aluminum honeycombs and Nomex *** to metal,polymer and Nomex paper,fiber-reinforced composites possess various merits,such as high specific stiffness and specific strength,excellent fatigue property,corrosion resistance and high-temperature ***,the applications of fiber-reinforced honeycomb material for sandwich core have unlimited potential in hypersonic vehicles,long-range rockets,cargo vessels and protective *** the fact that attention has been rapidly increasing,there is a lack of comprehensive reviews of new advances in the field of fiber-reinforced composite honeycomb *** this review,new advances reported by different scientists in the field of fiber-reinforced honeycomb materials have been reviewed and analyzed to provide an in-depth overview and knowledge for beginners in the field of ultralightweight and high-performance composite sandwich *** challenges and prospects for the development of fiberreinforced honeycomb materials have also been presented.

关键词： composite honeycomb materials sandwich structures failure mechanism mechanical property

来源：评论

学校读者我要写书评

暂无评论

Sandwich-Structured Composite Based on Performance-Differentiated Phase Change Materials for Versatile Thermal Management

SSRN

引用

SSRN 2025年

作者： Wang, Zihan Li, Xinze He, Chenbo Yang, Rui Yang, Mingyang Tang, Guihua Zhang, Hu Xie, Qi Sun, Jingjing Sun, Chencheng Li, Junning MOE Key Laboratory of Thermo-Fluid Science and Engineering School of Energy and Power Engineering Xi’an Jiaotong University Xi’an710049 China State Key Laboratory for Strength and Vibration of Mechanical Structures Xi’an Jiaotong University Xi’an710049 China Science and Technology on Advanced Functional Composites Laboratory Aerospace Research Institute of Materials and Processing Technology Beijing100076 China

Improving thermal management materials is crucial for achieving multifunctional integrated applications and enhancing energy efficiency. Though phase change materials exhibit excellent thermal storage properties, the limited thermal conductivity has hindered widespread use in dynamic and complex thermal environments. To address these challenges, we proposed a novel sandwich-structured composite based on composite phase change materials (CPCMs) with gradient thermal conductivities. The composite incorporates n-octadecane/melamine formaldehyde resin microencapsulated phase change materials (MPCM) as the phase change component, with nanoporous silica aerogel (SA) and flake graphite (FG) serving as the thermal insulation skeleton and high-thermal-conductivity support material, respectively. Characterization results revealed that the prepared CPCMs exhibited excellent shape stability and mechanical strength. Specifically, the SA/PCM composite demonstrated an ultralow thermal conductivity of 0.0725 W·m−1·K−1 and a phase change enthalpy of 109 J·g−1. In contrast, the thermal conductivity of FG/PCM composites increased significantly to 0.48–2.934 W·m−1·K−1 with 10–50 wt% FG loading, reaching up to 13.5 times that of pure MPCM. Transient thermal shock and multidirectional non-uniform heat disturbance tests confirmed the exceptional thermal insulation and temperature regulation capabilities in complex environments. Furthermore, tests based on real outdoor temperatures demonstrated that rooms equipped with the sandwich composite maintained more stable indoor temperatures, with a single-day maximum indoor temperature reduction of 3.15 °C than that using pure aerogel. These findings highlight the significant potential of the proposed sandwich-structured composite for advanced thermal management applications. © 2025, The Authors. All rights reserved.

关键词： Thermal insulation

来源：评论

学校读者我要写书评

暂无评论

Phase Engineering of Cu@Cu2o Core-Shell Nanospheres for Boosting Tandem Electrochemical Co2 Reduction to C2+ Products

SSRN

引用

SSRN 2022年

作者： Ye, Meng Shao, Tao Liu, Junyan Li, Chuanhao Song, Bo Liu, Shengwei School of Environmental Science and Engineering Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Sun Yat-sen University Guangzhou510006 China Northwest Normal University China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150001 China

Cu-based CO2 electrochemical reduction (CO2ER) is promising for reducing greenhouse gas emission and producing high-value multicarbon (C2+) chemicals and fuels. Unfortunately, the C2+ selectivity is still quite low. In this work, well-defined Cu@Cu2O core-shell nanospheres with time-dependent evolution of phase composition, crystallinity and morphology were specifically designed by a facile chemically induced self-transformation strategy. A maximum C2+ Faradaic efficiency (FE) exceeding 79%, including FEC2H4 reaching 44%, was achieved using phase-engineered Cu@Cu2O nanospheres. Based on the temperature-programmed desorption analyses and in-situ Raman spectroscopy, the adsorption behaviors of both CO2 reactant and *CO intermediate can be synergistically tuned by phase engineering of Cu@Cu2O nanospheres: Cu2O shell enhances *CO2 and *CO adsorption coverage, while porous Cu core concentrate and strengthens *CO intermediates for subsequent CO-CO coupling towards C2+ products. This work will shed new light on the phase engineering of Cu-based tandem electrocatalysts for tuning CO2/CO-catalyst interaction and modulating CO2ER processes and selectivity. © 2022, The Authors. All rights reserved.

关键词： Carbon dioxide

来源：评论

学校读者我要写书评

暂无评论

Evaluation of numerical ablation model for charring composites

引用

science China(Technological sciences) 2019年第8期62卷 1322-1330页

作者： LI Wei ZHANG Jun FANG GuoDong LI WeiJie LIANG Jun MENG SongHe Science and Technology on Advanced Composites in Special Environments Key Laboratory Harbin Institute of Technology Harbin 150001 China Institute of Advanced Structure Technology Beijing Institute of Technology Beijing 100081 China

Charring composites are widely used in the thermal protection system(TPS) to consume the intense aerodynamic heating during vehicle reentry. The ablation and thermal responses for the charring composites can be studied by using a numerical ablation model, in which the surface ablation and volume ablation could be taken into account. The coupling interactions among temperature, gas motion and interior pressure producing the pyrolysis gas could make the computation more complicated. A multi-physics model is developed to simulate the thermal response coupled with volume ablation and surface ablation. After studying four typical ablation cases, the model is validated, and then the heat transfer mechanisms in ablation are investigated. It is found that the viscous dissipation energy by the motion of pyrolysis gas can be neglected in the simulation. Also, the flow of pyrolysis gas plays an important role in the temperature response, especially under high heat flux condition.

关键词： ablation charring composites numerical model coupling

来源：评论

学校读者我要写书评

暂无评论

Chirality tuning and reversing with resonant phase-change metasurfaces

arXiv

引用

arXiv 2024年

作者： Sha, Xinbo Du, Kang Zeng, Yixuan Lai, Fangxing Yin, Jun Zhang, Hanxu Song, Bo Han, Jiecai Xiao, Shumin Kivshar, Yuri Song, Qinghai Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems Harbin Institute of Technology Shenzhen518055 China Pengcheng Laboratory Shenzhen518055 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China Nonlinear Physics Center Research School of Physics Australian National University CanberraACT2601 Australia Collaborative Innovation Center of Extreme Optics Shanxi University Shanxi Taiyuan030006 China

Dynamic control of circular dichroism in photonic structures is critically important for compact spectrometers, stereoscopic displays, and information processing exploiting multiple degrees of freedom. Metasurfaces can help miniaturize chiral devices but only produce static and limited chiral responses. While external stimuli are able to tune resonances, their modulations are often weak, and reversing continuously the sign of circular dichroism is extremely challenging. Here, we demonstrate dynamically tunable chiral response of resonant metasurfaces supporting chiral bound states in the continuum combining them with phase-change materials. Phase transition between amorphous and crystalline phases allows to control chiral response and vary chirality rapidly from −0.947 to +0.958 backward and forward via chirality continuum. Our demonstrations underpin the rapid development of chiral photonics and its applications. © 2024, CC BY.

关键词： Chirality

来源：评论

学校读者我要写书评

暂无评论

Anomaly Correction for Radiation Patterns of Active Phased Array Antenna Based on a Neural Network

引用

IEEE Antennas and Wireless Propagation Letters 2025年

作者： Guo, Kegang Zhang, Rui Shen, Lifei Feng, Yiwen Guo, Qingze Xu, Rongqi Tian, Linbo Zhang, Sasa Shandong University School of Information Science and Engineering Qingdao266237 China AVIC Research Institute for Special Structures of Aeronautical Composites Jinan250000 China Shandong University Key Laboratory of Education Ministry for Laser and Infrared System Integration Technology Qingdao266237 China Tsinghua University State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instruments Beijing100084 China

Anomaly interference in the radiation pattern of an active phased array antenna (APAA) is an intractable problem, that affects the overall system performance. To overcome this problem, this paper proposes an antenna radiation pattern anomaly correction model (ARPACM) based on a neural network to compensate for the shortcomings of the antenna radiation pattern (ARP) under anomalous conditions. In addition, to overcome the problem of the scarce data, this study uses simulated anomalous ARPs that are consistent with practical experimental conditions to construct and train a pre-trained model, named simulated ARPACM (SARPACM). The weights of the last hidden layer of the SARPACM are optimized using experimental data by introducing transfer learning, yielding an optimized ARPACM. Extensive experiments are conducted to verify the proposed ARPACM. The results indicate that the proposed model can outperform widely used correction algorithms and other training strategies, in terms of a mean coefficient of determination (R2), a mean square error (MSE), a mean relative error (MRE), achieving improvements of 99.76%, 0.08 dB, and 1.29%, respectively. Finally, the experimental results demonstrate that the ARPACM can effectively correct the anomalies of ARPs caused by various interfering factors. © 2002-2011 IEEE.

关键词： Mean square error

来源：评论

学校读者我要写书评

暂无评论

One-Pot Preparation of MXene/SPUA Hollow Microsphere and its Electromagnetic Absorbing Properties

SSRN

引用

SSRN 2022年

作者： An, Boyuan Zhang, Dongjie Liu, Yuyan Fan, Zhimin Tan, Huifeng Xie, Zhimin National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and Structures Harbin Institute of Technology Harbin150001 China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin150001 China

Ti3C2Tx (MXene) has potential applications in electromagnetic (EM) absorbing due to its excellent electrical properties. Generally, the MXene hollow core-shell structure is obtained by the template method for EM absorbing. However, due to the need of post-processing such as high-temperature carbonization, this will lead to the oxidation of MXene. Here, we propose a one-pot method to prepare MXene/SPUA hollow microspheres through the emulsion polymerization to avoid this defect. The flocculation method was used to increase the content of MXene in the SPUA shell. UV spectrum and SEM proved the high content of MXene in the shell and the acquisition of regular microspheres with the introduction of arabic gum. Remarkably, the MXene/SPUA hollow microspheres with K2SO4 flocculant achieve a RLmin of -18dB with a corresponding EAB of 4 GHz. While the RLmin of microspheres without K2SO4 flocculant all > -10 dB. In addition, we also found the MXene/SPUA hollow microsphere with regular spherical structure has better EM absorbing performance. It is reasonable to consider that MXene/SPUA microspheres are more compatible with polymer matrix. At the same time, MXene/SPUA hollow microspheres have nonmagnetic particles, they are particularly suitable for applications in fields with limited magnetic properties, such as medical and health care. © 2022, The Authors. All rights reserved.

关键词： Microspheres

来源：评论

学校读者我要写书评

暂无评论

Microstructure and mechanical properties of(TiZrNbTaMo)C high-entropy ceramic

引用

Journal of Materials science & technology 2020年第4期39卷 99-105页

作者： Kai Wang Lei Chen Chenguang Xu Wen Zhang Zhanguo Liu Yujin Wang Jiahu Ouyang Xinghong Zhang Yudong Fu Yu Zhou School of Materials Science and Engineering Harbin Institute of TechnologyHarbin150001China National Key Laboratory of Science and Technology on Advanced Composites in Special Environment Harbin Institute of TechnologyHarbin150001China Key Laboratory of Advanced Structural-Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin150001China College of Materials Science and Engineering Harbin Engineering UniversityHarbin150001China

A high-entropy(Ti Zr Nb Ta Mo)C ceramic has been successfully fabricated by hot pressing the newlysynthesized quinary carbide powder to investigate its microstructure and mechanical *** carbothermal reduction process of equimolar quinary metallic oxides at 1500℃for 1 h generates a carbide powder mixture,which consists mainly of Ta C-and Zr C-based solid *** as-synthesized powder was then sintered to form a single-phase high-entropy ceramic by a two-step hot pressing at 1850℃for1 h and 2100℃for 0.5 h,*** high-entropy ceramic exhibits a fine grain size of about 8.8μm,a high compositional uniformity and a high relative density of 98.6%by adding Mo as the strategic main *** measured nanohardness values of(TiZrNbTaMo)C ceramic are 25.3 GPa at 9.8 N and 31.3 GPa at 100 m N,respectively,which are clearly higher than those of other available high-entropy carbide ceramics.

关键词： High-entropy ceramic (TiZrNbTaMo)C Microstructure Enhanced hardness

来源：评论

学校读者我要写书评

暂无评论

A Li+-Flux-Homogenizing Separator for Long-Cycle Li Metal Anodes

SSRN

引用

SSRN 2023年

作者： Ji, Yuanpeng Dong, Liwei Liu, Jipeng Xie, Haodong Zhong, Shijie Yang, Mengqiu Liu, Yuanpeng Yang, Chunhui Han, Jiecai He, Weidong MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin150080 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and Structures Harbin Institute of Technology Harbin150080 China State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology Harbin150080 China Chongqing Research Institute Harbin Institute of Technology Chongqing401151 China School of Mechanical Engineering Chengdu University Chengdu610106 China

The uneven arrangement of pores and poor electrolyte affinity of separators made from polyolefins or poly(vinylidene difluoride) (PVDF) can result in disordered Li-ion (Li+) flux and rugged deposition layers, giving rise to continuous consumption of lithium salt and premature expiration of lithium metal batteries (LMBs). Although adjusting pore structure or modifying the surface of these separators is effective, it is space-occupied and not economically or industrially viable. Herein, we propose a novel and feasible method of incorporating the antistatic agent SN (SN), namely, octadecyl dimethyl hydroxyethyl quaternary ammonium nitrate, with the PVDF-HFP matrix to create a homogeneous composite separator (PVDF-HFP/SN) for LMBs. The ammonium head of the SN molecule provides numerous anion-friendly sites that can absorb PF6- ions in the electrolyte. This leads to a Li-affinity integrated matrix, which allows for uniformly distributed Li+ in the SN···PF6-···Li+ configurations. These configurations guarantee a homogeneous Li+ flux distribution and deposition, and further, reduce the consumption of lithium salt, ensuring the ultralong cycling dendrite-free Li anode. Hence, using the PVDF-HFP/SN separator, we achieve exceptional stability in a Li||Li symmetric cell for 1000 hours with the lowest overpotential at 0.5 mA cm-2 with a capacity of 1 mAh cm-2, and the Li||LiFePO4 cell demonstrates a capacity of 120.4 mAh g-1 with an unparalleled capacity retention of 93.4% after 1000 cycles at 2 C (1 C = 170 mA g-1). This innovative design strategy for functional separators shows great promise in expanding the operation lifespan of LMBs. © 2023, The Authors. All rights reserved.

关键词： Separators

来源：评论

学校读者我要写书评

暂无评论

Dynamic Analysis of the Human-Machine System of a 4-Bar Gait Constraint Mechanism

Dynamic Analysis of the Human-Machine System of a 4-Bar Gait...

引用

IEEE International Conference on Mechatronics, Robotics and Automation (ICMRA)

作者： Lailu Li Lixun Zhang Bing Wang Da Song National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin China College of Mechanical and Electrical Engineering Harbin Engineering University Harbin China School of Mechanical Engineering Northeast Electric Power University Jilin China

Bar gait constraint mechanism has been proposed in terms of its benefits: low-cost, easy to adjust, and low weight. Aiming to analyze the interaction characteristics between the human body and the end-effector of the 4-Bar mechanism, it is necessary to conduct the dynamic analysis of the human-machine system, including the interaction force, contact force, and joint torque. First, a gait constraint mechanism based on 4-Bar was introduced. Second, the dynamic mathematical model of the human-machine system was established. Third, the dynamic simulation based on the mathematical equations was carried out. The results demonstrate that the interaction force between the machine and the human body is smooth. The human joint torques are also in a reasonable range, indicating that the 4-Bar gait constraint mechanism could assist individuals with locomotion obstacles to achieve low-limb exercises.

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：