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Recyclable Technology of Thermosetting Resins for High Thermal Conductivity Materials Based on Physical Crushing

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ENERGY & ENVIRONMENTAL MATERIALS 2024年第6期7卷 378-387页

作者： Zhong, An Xie, Congzhen Gou, Bin zhou, jiangang Xu, Huasong Yu, Song Zhang, Daoming Bi, Chunhui Cai, Hangchuan Li, Licheng Wang, Rui South China Univ Technol Sch Elect Power Guangzhou 510641 Peoples R China

Epoxy resin, characterized by prominent mechanical and electric-insulation properties, is the preferred material for packaging power electronic devices. Unfortunately, the efficient recycling and reuse of epoxy materials with thermally cross-linked molecular structures has become a daunting challenge. Here, we propose an economical and operable recycling strategy to regenerate waste epoxy resin into a high-performance material. Different particle size of waste epoxy micro-spheres (100-600 mu m) with core-shell structure is obtained through simple mechanical crushing and boron nitride surface treatment. By using smattering epoxy monomer as an adhesive, an eco-friendly composite material with a "brick-wall structure" can be formed. The continuous boron nitride pathway with efficient thermal conductivity endows eco-friendly composite materials with a preeminent thermal conductivity of 3.71 W m-1 K-1 at a low content of 8.5 vol% h-BN, superior to pure epoxy resin (0.21 W m-1 K-1). The composite, after secondary recycling and reuse, still maintains a thermal conductivity of 2.12 W m-1 K-1 and has mechanical and insulation properties comparable to the new epoxy resin (energy storage modulus of 2326.3 MPa and breakdown strength of 40.18 kV mm-1). This strategy expands the sustainable application prospects of thermosetting polymers, offering extremely high economic and environmental value. This manuscript reports the strategy to recycle waste epoxy resins into high thermal conductivity epoxy composites with brick-wall topology based on the physical recycling method. The ultralow content of BN (e.g., 8.5 vol%) endows the composite with record thermal conductivity of 3.71 W m-1 K-1 at the same volume fraction level. image

关键词： brick-wall structure epoxy thermosetting physical recycling thermal management DIELECTRIC-PROPERTIES EPOXY COMPOSITES WASTE MANAGEMENT PLASTICS NANOCOMPOSITE POLYMERS

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从脾肺辨治阴虚痰火型流行性感冒后久咳不愈

首都食品与医药 2024年第8期31卷 157-159页

作者：金跃兰郭兰中周建刚浙江省东阳市歌山镇卫生院浙江金华322100 浙江省东阳市妇幼保健院浙江金华322100

咳嗽既是独立疾病,也是多种肺系疾病的常见症状,特别是感受疫毒后,常遗留久咳不愈。既往临床治疗多从肺论治,然“五脏六腑皆令人咳,非独肺也”。中医诊疗重视个体体质、生活环境、疫毒特点等,强调因人而异。结合浙江地区环境特点、当前... 详细信息

咳嗽既是独立疾病,也是多种肺系疾病的常见症状,特别是感受疫毒后,常遗留久咳不愈。既往临床治疗多从肺论治,然“五脏六腑皆令人咳,非独肺也”。中医诊疗重视个体体质、生活环境、疫毒特点等,强调因人而异。结合浙江地区环境特点、当前生活饮食习惯、时疫特点,流行性病毒感染后多从热化,加之平素脾虚气弱,患者通常内有伏痰,阴虚痰火型咳嗽在临床较为多见。治疗当从脾肺论治,注重健脾助运,杜绝生痰之源,又可使气血生化有源,濡养肺脏;顾护肺卫,使营卫调和,可抵御外邪反复侵袭,使内外皆安,诸证自除。

关键词：流行性感冒咳嗽阴虚痰火

The minimization of non-equilibrium plasma source at high pressure

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Chinese Science Bulletin 2008年第21期53卷 3425-3428页

作者： BAI MinDi QIU XiuMei LIU Dong YANG Bo zhou jiangang XUE XiaoHong GU JianLong Research Institute of Environmental Engineering Dalian Maritime University Dalian 116026 China

The density of plasma produced by atmospheric non-equilibrium plasma source is the function of en-ergy dissipation rate in ionization electric field and gas particles *** experiment shows that the plasma density highly rises with the increasing of energy dissipation rate and gas particles *** the energy dissipation rate of activation field is 2.18 Wh/m3 and the average gas particles momentum is 109×10-22 g·m/s,the air throughput of plasma source whose volume is only 2.5 cm3 can be up to 12 m3/h and the density of plasma can be up to 1010 *** research can develop a method of producing minitype plasma source which is low energy consumption but high ion concen-tration used for chemical industry,environmental engineering and military.

关键词：电离化高压状态等离子体气体微粒物

大气压非平衡等离子体源参数对输出等离子体浓度的影响及其机理分析

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高电压技术 2014年第7期40卷 2071-2076页

作者：周建刚大连大学物理科学与技术学院大连116622

为研究各个参数对大气压非平衡等离子体源的影响，给进一步探讨其机制提供依据，在保持其他参数不变的前提下，变化大气压非平衡等离子体源的某一个参数，用DLY-3型大气离子数密度测量仪测量其输出等离子体中离子的数密度。结果表明：... 详细信息

为研究各个参数对大气压非平衡等离子体源的影响，给进一步探讨其机制提供依据，在保持其他参数不变的前提下，变化大气压非平衡等离子体源的某一个参数，用DLY-3型大气离子数密度测量仪测量其输出等离子体中离子的数密度。结果表明：在击穿限度内输出的离子数密度随外加电压升高而升高；在空气体积流量不影响放电空间分布的前提下，输出的离子数密度随体积流量增加而升高：在4．7～10kHz范围内输出的离子数密度随交流电源频率增加而升高；在2种实验放电间隙中，小间隙（0．64mm）比大间隙（1．00mm）的输出离子数密度高。在各个参数可调控的条件下所做的等离子体浓度测量可定量地描述等离子体系统的状态及其相应变化，通过变换各个参数可以使大气压非平衡等离子体源输出的等离子体浓度在相当大的范围内变化，并存在极大值。

关键词：大气压非平衡等离子体源强电离放电等离子体浓度介质阻挡放电

Boltzmann方程用于气体分子系统与用于非平衡等离子体之间的差异

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高电压技术 2016年第6期42卷 1929-1934页

作者：周建刚大连大学物理科学与技术学院

尽管严格地说传统的Boltzmann方程应用范围仅是中性气体分子系统,但将其应用于常见的非平衡等离子体包括大气压条件下流动的非平衡等离子体时,对其结果做一定修正后仍然正确。为解释其原因,对Boltzmann方程的建立过程进行了分析。结果表... 详细信息

尽管严格地说传统的Boltzmann方程应用范围仅是中性气体分子系统,但将其应用于常见的非平衡等离子体包括大气压条件下流动的非平衡等离子体时,对其结果做一定修正后仍然正确。为解释其原因,对Boltzmann方程的建立过程进行了分析。结果表明:要将Boltzmann方程的应用范围从中性气体分子体系扩展到各种条件下的非平衡等离子体,同时又不必在最后结果上做人为的修正,则Boltzmann方程右边碰撞项的后面要加上产生项和损失项。添加了产生项和损失项的Boltzmann方程是一个既适用于气体分子系统也适用于各种非平衡等离子体的普适基本方程。

关键词： Boltzmann方程气体分子体系统非平衡等离子体带电粒子产生项损失项

Hemispherical resonator with low subsurface damage machined by small ball-end fine diamond grinding wheel:A novel grinding technique

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Chinese Journal of Aeronautics 2024年第5期37卷 570-585页

作者： Biao QIN Henan LIU Jian CHENG Jinchuan TIAN jiangang SUN Zihan zhou Chuanzhen MA Mingjun CHEN State Key Laboratory of Robotics and System Harbin Institute of TechnologyHarbin 150001China Center for Precision Engineering Harbin Institute of TechnologyHarbin 150001China

As for the ultra-precision grinding of the hemispherical fused silica resonator,due to the hard and brittle nature of fused silica,subsurface damage(SSD)is easily generated,which enormously influences the performance of such ***,ultra-precision grinding experiments are carried out to investigate the surface/subsurface quality of the hemispherical resonator machined by the small ball-end fine diamond grinding *** influence of grinding parameters on the surface roughness(SR)and SSD depth of fused silica samples is then *** experimental results indicate that the SR and SSD depth decreased with the increase of grinding speed and the decrease of feed rate and grinding *** addition,based on the material strain rate and the maximum undeformed chip thickness,the effect of grinding parameters on the subsurface damage mechanism of fused silica samples is ***,a multi-step ultra-precision grinding technique of the hemispherical resonator is proposed based on the interaction influence between grinding depth and feed ***,the hemispherical resonator is processed by the proposed grinding technique,and the SR is improved from 454.328 nm to 110.449 nm while the SSD depth is reduced by 94%from 40μm to 2.379μ*** multi-step grinding technique proposed in this paper can guide the fabrication of the hemispherical resonator.

关键词： Fused silica Ultra-precision grinding Hemispherical resonator Subsurface damage Grinding technique

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最小信道检测开销的协作频谱感知算法

西安电子科技大学学报 2015年第2期42卷 206-212页

作者：秦臻周剑刚薛峰西安电子科技大学电子工程学院陕西西安710071 四川大学制造科学与工程学院四川成都610065 湖北省无线电管理委员会湖北武汉430071

在资源受限的无线电认知网络中,协作频谱感知技术的应用提升了系统性能,却同时增加了信道检测开销.选择合适的系统参数可以有效地降低信道检测开销.采用能量检测方法,分别对单用户和多用户频谱感知系统模型进行了分析,提出信道检测开销... 详细信息

在资源受限的无线电认知网络中,协作频谱感知技术的应用提升了系统性能,却同时增加了信道检测开销.选择合适的系统参数可以有效地降低信道检测开销.采用能量检测方法,分别对单用户和多用户频谱感知系统模型进行了分析,提出信道检测开销优化算法并推导出数学表达式,理论上证明了检测开销必然存在一个最小值,同时给出了算法思路和实现步骤.仿真结果也验证了系统参数优化的有效性和最小信道检测开销算法的合理性.

关键词：认知无线电协作频谱感知能量检测最小检测开销

Development and application of model for predicting molten metal temperature in continuous casting process

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Baosteel Technical Research 2019年第2期13卷 10-16页

作者： FAN Junfei REN Sanbing FANG Yuan zhou jiangang QIN Bo Research Institute Baoshan Iron &Steel Co.Ltd.Shanghai 201999China Shanghai Engineering Research Center of Strip Casting and Rolling Shanghai 201999China

An unsteady mathematical thermal model was developed for predicting the time,molten-steel weight,induction heating power,and temperature changes of the steel from the end of ladle refining to the end of the continuous-casting process of a tundish. The calculations revealed that for a specific strip-casting process,the ladle tonnage should be controlled to about 90 t. If the ladle capacity reaches 130 t,the provision of a 1 500-kW tundish induction heating device is recommended. By comparing the measured and predicted molten-steel temperature values in the Ningbosteel-Baosteel strip casting industrialization demo project( NBS) of a tundish,it was determined that the prediction accuracy of the model could meet the forecasting accuracy requirements for the molten-steel temperature in the tundish during mass production. Simultaneously,the heat flux density on each surface of the tundish was found at about 50 min,which is entirely consistent with the values reported in the related literature,and the tundish had not reached a heat balance during the casting test period. This model can also be applied to calculate the suitable size of a tundish for a specific continuous-casting process,thereby providing a theoretical basis for the design of the continuous-casting tundish.

关键词： continuous casting strip casting molten metal temperature prediction model

Metal-to-insulator transitions in 3d-band correlated oxides containing Fe compositions

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International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 48-59页

作者： Yiping Yu Yuchen Cui jiangang He Wei Mao Jikun Chen Key Laboratory of Advanced Materials and Devices for Post-Moore Chips Ministry of EducationUniversity of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Institute of Industrial Science The University of Tokyo4-6-1 KomabaMeguro-kuTokyo 153-8505Japan

Metal-to-insulator transitions (MITs),which are achieved in 3d-band correlated transitional metal oxides,trigger abrupt variations in electrical,optical,and/or magnetic properties beyond those of conventional *** such material families,iron(Fe:3d^(6)4s^(2))-containing oxides pique interest owing to their widely tunable MIT properties,which are associated with the various valence states of *** potential electronic applications also show promise,given the large abundance of Fe on *** MIT properties triggered by critical temperature (TMIT) were reported for ReFe_(2)O_(4)(Fe^(2.5+)),ReBaFe_(2)O_(5)(Fe^(2.5+)),Fe_(3)O_(4)(Fe^(2.67+)),Re_(1/3)Sr_(2/3)FeO_(3)(Fe^(3.67+)),Re Cu_(3)Fe_(4)O_(12)(Fe^(3.75+)),and Ca_(1-x)Sr_(x)FeO_(3)(Fe^(4+))(where Re represents rare-earth elements).The common feature of MITs of these Fe-containing oxides is that they are usually accompanied by charge ordering transitions or disproportionation associated with the valence states of ***,we review the material family of Fe-containing MIT oxides,their MIT functionalities,and their respective *** the perspective of potentially correlated electronic applications,the tunability of the TMITand its resultant resistive change in Fe-containing oxides are summarized and further compared with those of other materials exhibiting MIT *** particular,we highlight the abrupt MIT and wide tunability of TMITof Fe-containing quadruple perovskites,such as Re ***,their effective material synthesis still needs to be further explored to cater to potential applications.

关键词： metal-to-insulator transitions Fe-containing oxides charge ordering charge disproportionation