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Regulation voltage of liNiPO_(4) by density functional theory(DFT)calculation to move towards practical application

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Interdisciplinary Materials 2023年第3期2卷 443-458页

作者： Bo Zhang Yufang He Aiping Wang Xiang Xiao Jinli liu Yingqiang Wu li Wang Hong Xu jiangang li Hao Zhang Xiangming He Institute of Nuclear&New Energy Technology Tsinghua UniversityBeijingChina College of Chemical Engineering Beijing University of Chemical TechnologyBeijingChina Beijing Key Laboratory of Advanced Chemical Energy Storage Technologies and Materials Research Institute of Chemical DefenseBeijingChina

liNiPO_(4)(working at~5.1 V)shows potential advantages in the competition of cathode materials for lithium-ion batteries(liBs)because of high energy ***,the high-voltage electrolyte developed can only remain relatively stable in the range of less than 4.8V,so the operating voltage of liNiPO_(4)needs to be adjusted to smaller to better exploit its high-voltage *** regulate the operating voltage of liNiPO_(4)while ensuring the relative stability of its electrochemical properties,in this work,all the 3d,4d,and 5d transition metals(TMs)are,respectively,doped into the Ni site of liNiPO_(4)to screen out the doped models with excellent electrochemical *** particular,the changes in lattice structure,electronic properties,formation energy,mechanical properties,anisotropy,and working voltage were used as screening *** considering the above screening criteria,the Cr-and Fe-doped liNiPO_(4)with open circuit voltage~4.7 and~4.8 V are considered to have leading performance and can be used for applicable high-voltage *** screening results of this work can provide an overall understanding of the doping of liNiPO_(4)by TMs and have advanced a theoretical idea for the design of new high-voltage liBs cathode materials.

关键词： computational screening doping high voltage liNiPO_(4) lithium-ion batteries

亚临床剂量盐酸艾司氯胺酮在剖宫产术中的效果观察

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云南医药 2024年第1期45卷 38-41页

作者：杨雪辉张宇杨春鹤吴婕韩兴忠李建钢曲靖市第一人民医院麻醉科云南曲靖655000 曲靖市第一人民医院脊柱外科云南曲靖655000

目的探讨亚临床剂量盐酸艾司氯胺酮应用于腰硬联合麻醉剖宫产术的疗效和安全性。方法2021年12月-2022年12月在本院接受罗哌卡因腰硬联合麻醉剖宫产术的78例孕产妇随机等分为观察组和对照组。观察组胎儿娩出后静注0.2mg/kg盐酸艾司氯胺酮... 详细信息

目的探讨亚临床剂量盐酸艾司氯胺酮应用于腰硬联合麻醉剖宫产术的疗效和安全性。方法2021年12月-2022年12月在本院接受罗哌卡因腰硬联合麻醉剖宫产术的78例孕产妇随机等分为观察组和对照组。观察组胎儿娩出后静注0.2mg/kg盐酸艾司氯胺酮,对照组静注等量生理盐水。比较麻醉指标、麻醉效果、不同时间点VAS评分、Ramsay评分和不良反应发生率的组间差异。结果2组间麻醉指标无差异(P>0.05);观察组麻醉优良率高于对照组,差异有统计学意义(97.44%VS 82.05%,P0.05)。结论孕产妇罗哌卡因腰硬联合麻醉剖宫产术中亚临床剂量盐酸艾司氯胺酮静注高效、安全,可增强术中、术后镇静镇痛效果,值得进一步研究和推广。

关键词：盐酸艾司氯胺酮亚临床剂量剖宫产术镇静镇痛

High-Quality and Wafer-Scale Cubic Silicon Carbide Single Crystals

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Energy & Environmental Materials 2024年第4期7卷 442-449页

作者： Guobin Wang Da Sheng Yunfan Yang Hui li Congcong Chai Zhenkai Xie Wenjun Wang jiangang Guo Xiaolong Chen Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences University of Chinese Academy of Sciences

Cubic silicon carbide (3C-SiC) has superior mobility and thermal conduction over that of widely applied hexagonal ***,much lower concentration of interfacial traps between insulating oxide gate and3C-SiC helps fabrica... 详细信息

关键词： cubic SiC high-temperature solution growth high-temperature surface tension solid–liquid interfacial energy wide band gap semiconductor

AC loss and contact resistance in highly flexible rebco cable for fusion applications

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Superconductivity 2022年第2期2卷 39-45页

作者： Zichuan Guo Jinggang Qin R.Lubkemann Keyang Wang Huan Jin Guanyu Xiao jiangang li Chao Zhou Arend Nijhuis University of Twente Faculty of Science&Technology7522 NB EnschedeThe Netherlands University of Science and Technology of China HefeiAnhui 230026People’s Republic of China Institute of Plasma Physics Chinese Academy of SciencesHefeiAnhui 230031People’s Republic of China Department of Mechanics and Engineering Science Lanzhou UniversityLanzhouGansu 730000People's Republic of China

High Temperature Superconductor(HTS)materials can operate at higher magnetic fields up to 20 T with high critical current and higher operating temperature,compared to low temperature superconductors(LTS).A Highly Flexible REBCO Cable(HFRC)is introduced at the Institute of Plasma Physics,Chinese Academy of Sciences(ASIPP);a cabling method that is suitable for REBCO HTS tape having anisotropic material properties in its thin REBCO *** type of HTS superconducting cable shows high potential for applications in nuclear *** alternating currents and magnetic fields in tokamak type of fusion magnets,cause AC power losses in such cables,which can provoke instability of the conductor by induced currents and increase the *** a first step in characterizing the electromagnetic(EM)performance of an HFRC cable,the AC loss and contact resistance of the HFRC prototype cable were measured at the University of *** measurements were done in liquid helium(4.2 K)with AC magnetic fields,applied perpendicular to the cable's long *** AC loss was measured simultaneously by a calibrated gas flow calorimeter utilizing the helium boil-off method,and by the magnetization method using pick-up *** the applied test conditions,no coupling loss could be distinguished as a part of the overall AC *** is suggested that this might be explained by the shielding of the conductor interior from the applied magnetic field by the outer tape layer due to the high critical current density of the REBCO tape,leading to a high penetration field.

关键词： High temperature superconductor REBCO tape HFRC AC loss Contact resistance

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

Fitting of Continuous line Segments with Arc Paths

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Fitting of Continuous Line Segments with Arc Paths

Biological Toxicity of Sewage Sludge Stabilized by Reed Bed on the Luminescent Bacteria

第37届中国控制会议

作者： jiangang li Xiqing Sun Ye liu D202N HIT Campus of University Town of Shenzhen

In this paper, we propose a half-constraint least squares algorithm to fit the continuous line segments with arc paths. In particular, we develop a method to calculate the nodes, with which the fitting algorithm is more robust against the noise and the arc path contains more arcs. Moreover, the tolerance of the first-order derivative is considered for the nodes, so that the arc path becomes smoother. Numerical simulations and experiments are conducted to verify the validity of the proposed method and to show the improved performance in the sense of high precision.

关键词： least squares fitting arc path derivable tolerance

来源： cnki会议评论

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Journal of Geoscience and Environment Protection 2015年第1期3卷 1-6页

作者： jiangang li Yubo Cui Wanjun Zhang Yuying Dong Shuran Jia College of Environment and Resources Dalian Nationalities University Dalian China

With the expanding scale of urban wastewater treatment, the resulting excess sludge quantity is also growing. Excess sludge treatment and disposal has become an important part of the sewage treatment. Sludge itself is rich in essential nutrients of plant growth such as nitrogen and phosphorus, so it’s a good organic fertilizer;but it often also contains harmful substances such as heavy metals. If the sludge treatment is not good, it not only can bring secondary pollution to the environment, but also can cause the waste of resources. Luminescent bacteria tests are conducted in this research by comparing the effects on the absorption and transformation of toxic substances between traditional sludge drying bed and reed bed. The study finds that the biological toxicity of surface layer sludge either in reed bed or in traditional drying bed has little change with the seasons and maintains in low level. While the biological toxicity in the bottom of sludge has change with the seasons and achieves the lowest level in summer and fall, and the biological toxicity of sludge in reed bed is lower than that of traditional drying bed.

关键词： Reed Bed Activated Sludge Luminous Bacteria Biological Toxicity

Large-scale synthesis of lithium-and manganese-rich materials with uniform thin-film Al2O3 coating for stable cathode cycling

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Science China Materials 2020年第9期63卷 1683-1692页

作者： Yuqiong Kang Zheng liang Yun Zhao Haiping Xu Kun Qian Xiangming He Tao li jiangang li School of Chemical Engineering Beijing Institute of Petrochemical TechnologyBeijing 102617China Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology Beijing 102617China State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijing 100084China Department of Chemistry and Biochemistry Northern Illinois UniversityDeKalbIL 60115USA Materials Sciences Division Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA

The lithium-and manganese-rich layered oxide(LMR)holds great promise as a cathode material for lithiumion battery(liB)applications due to its high capacity,high voltage and low ***,its poor initial Coulombic efficiency(ICE)and unstable electrode/electrolyte interface with continuous growth of the solid electrolyte interphase leads to high impedance and large *** effects cause severe capacity loss and safety *** this work,we have developed a novel approach to fabricate a stable LMR cathode with a uniform thin layer of aluminum oxide(Al2O3)coated on the surface of the LMR *** synthesis approach uses the microemulsion method that is environment-friendly,cost-effective and can be easily ***,an 8-nm layer of Al2O3 is shown to be effective in stabilizing the electrode/electrolyte interface(enhanced ICE to82.0%and moderate impedance increase over 200 cycles).Moreover,the phase transformation from layered to spinel is inhibited(96.3%average voltage retention)and thermal stability of the structure is significantly increased(heat release reduced by 72.4%).This study opens up a new avenue to address interface issues in liB cathodes and prompts the practical applications of high capacity and voltage materials for high energy density batteries.

关键词： lithium ion batteries lithium-and manganese-rich layered oxides surface modification metal oxide thin film uniform coating large-scale synthesis battery safety

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基于插齿数值计算模型的非圆齿轮根切分析

农业机械学报 2007年第6期38卷 138-142页

作者：李建刚吴序堂李泽湘哈尔滨工业大学深圳研究生院西安交通大学机械工程学院

提出了一种判断非圆齿轮任意齿廓是否发生根切的精确方法。该方法首先从非圆齿轮齿廓数值计算模型出发,计算出齿廓在节曲线法向等距线上的一系列点和形成这些点的对应插齿刀齿廓上的点,然后利用齿廓啮合基本定律对非圆齿轮齿廓根切进行... 详细信息

提出了一种判断非圆齿轮任意齿廓是否发生根切的精确方法。该方法首先从非圆齿轮齿廓数值计算模型出发,计算出齿廓在节曲线法向等距线上的一系列点和形成这些点的对应插齿刀齿廓上的点,然后利用齿廓啮合基本定律对非圆齿轮齿廓根切进行理论分析,最后将插齿数字模型和根切产生的原理综合起来,得出判断各个齿是否发生根切的精确方法,并首次对齿廓的根切程度提出了量化计算方法。根据这些方法可以在设计阶段对非圆齿轮根切缺陷进行校验和评价。

关键词：非圆齿轮根切齿廓数值计算