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Effect of Disturbances on the Operation Process of a Methane-Fueled Free-Piston Engine Generator

Journal of Thermal Science 2023年第2期32卷 881-896页

作者： HUANG Fujun XIAO Huihui GUO Shuman WANG Lijun yang zhenzhong KONG Wenjun School of Mechanics North China University of Water Resources and Electric PowerHenan 450045China Henan International Joint Laboratory of Thermo-Fluid Electro-Chemical System for New Energy Vehicle Henan 450045China School of Astronautics Beihang UniversityBeijing 102206China

In this paper,the effect of disturbances on the operation process of a methane-fueled free-piston engine generator(FPEG)was experimentally *** disturbance sources,namely step change of external load,mixture flow rate fluctuation,random misfire of a cylinder,and elastic collision,were identified and applied to the *** results showed that the FPEG successfully achieved a steady-state operation with *** maximum instantaneous electric power of 127 W and the average effective electric power of 38.9 W were *** an external load was instantaneously disconnected,the engine frequency increased from 26.7 Hz to 31.3 *** fluctuation amplitudes of induced voltage,pressure and compression ratio were 18.9%,24.7%and 52.2%respectively in the *** contrast,when the external load was instantaneously connected,the corresponding values were 42.2%,31.3%and 64.3%respectively,indicating that the instantaneous external load connection had a greater disturbance impact on the FPEG operation *** encountering the step change of external load,the FPEG can still restore stable operation and show good anti-disturbance *** with increasing mixture flow rate,reducing the mixture flow rate has a greater disturbance impact on the engine operation *** random misfire of a cylinder will cause remarkable fluctuations in piston displacement and cylinder pressure,the FPEG will not stop running,but continues to work as a single-piston *** collision event may adversely affect the stability of engine operation,but will not lead to the FPEG ***,serious collision event may lead to ignition failure and shutdown accident.

关键词： free-piston engine generator disturbance sources operation stability anti-disturbance ability

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Synthesis of 3D ordered porous polystyrene using silica template

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Chinese Science Bulletin 2001年第4期46卷 306-308页

作者： Jianhua Rong zhenzhong yang Kai Qi Xigao Jin Chinese Acad Sci Inst Chem Ctr Mol Sci State Key Lab Polymer Phys & Chem Beijing 100080 Peoples R China

A rigid colloidal silica template was formed by self-assembly of the monodispersed silica spheres prepared according to Stober method. The silica template is highly ordered, which was verified by bright color effect due to Bragg diffraction and the results of SEM. The free radical polymerization of styrene was allowed within the interstices of the rigid template to result in the formation of the three-dimensional periodic silica/polystyrene nano-composites. The titled porous polystyrene was prepared by chemical decomposition of the template with concentrated aqueous hydrofluoric acid. Scanning electron microscopy characterization showed that the macroporous polystyrene has ordered arrays of the uniform pores replicated from the template. Moreover, it was found that the morphology of the as-synthesized macroporous polystyrene was greatly affected by the connectivity of the silica spheres treated under different conditions.

关键词： template synthesis colloidal silica three-dimensional order macroporous polystyrene.

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一种重载电机的轴承配置与关键装配技术

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微特电机 2024年第5期52卷 70-73页

作者：杨振中黄志强姚秋华中车株洲电机有限公司株洲412001

为满足重载电机受力的要求,对N端轴承结构进行了技术升级,将电机的一个非传动端的深沟球轴承6326优化为一个圆柱滚子轴承NU320与一个四点接触球轴承QJ318的组合结构,其中NU320轴承承受径向力,QJ318轴承承受轴向力。主要研究三轴承电机... 详细信息

为满足重载电机受力的要求,对N端轴承结构进行了技术升级,将电机的一个非传动端的深沟球轴承6326优化为一个圆柱滚子轴承NU320与一个四点接触球轴承QJ318的组合结构,其中NU320轴承承受径向力,QJ318轴承承受轴向力。主要研究三轴承电机装配时,保证电机非传动端两个轴承的同轴度问题以及QJ318四点接触球轴承承受一定的轴向压力问题,避免电机因同轴度超差及轴向压力过大导致QJ318轴承外圈变形带来温升及振动超差的负面影响。

关键词：重载电机轴承游隙同轴度

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Investigation on the electrochemical activation process of Li1.20Ni0.32Co0.004Mn0.476O2

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Progress in Natural Science:Materials International 2014年第4期24卷 388-396页

作者： Daichun Tang Daotan Liu Yanyan Liu zhenzhong yang Liquan Chen Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences China Electric Power Research Institute

The lithium-rich layered oxides are one of the most attractive cathode materials for lithium-ion ***,two types of Li1.20Ni0.32Co0.004Mn0.476O2 were synthesized using Li2CO3 and LiOH as lithium *** electrochemical activation process occurs in Li1.2Ni0.32Co0.004Mn0.476O2 prepared from Li2CO3(LLO-1),while no obvious activation in Li1.2Ni0.32Co0.004Mn0.476O2 prepared from LiOH(LLO-2) is *** advanced scanning transmission electron microscopy(STEM),we found that Li2MnO3-like structure is rich in the surface region of *** study provides a direct explanation for the electrochemical activation of lithium-rich *** sample with more LiMO2-like phase at the surface region shows a better cycling *** is likely that more LiMO2-like phase at the surface region could stabilize the interface and improve the cycling performance of the Li-rich cathode materials.

关键词： Lithium-rich Electrochemical activation Surface structure STEM imaging

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Template synthesis of 3-D bi-modal ordered porous silica

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Chinese Science Bulletin 2001年第21期46卷 1785-1790页

作者： yang zhenzhong QI Kai RONG Jianhua WANG Lijun LIU Zhengping yang Yunxin State Key Laboratory of Polymer Physics and Chemistry Center for Molecular ScienceInstitute of ChemistryChinese Academy of SciencesBeijing 100080China Department of Chemistry Beijing Normal UniversityBeijing 100875China Shanghai Petrochemical Company Limited Shanghai 200540China

A dual template synthesis combined with a modified bulk sol-gel process was used to prepare the three dimensional bimodal ordered porous silica, in which the macropore wall is mesoporous and both the pores are interconnected. The macropores were replicated from the template of the dried polystyrene colloidal crystal after being removed by calcination at high temperature, whislt the mesopores were achieved by burning off the surfactant in the gel. The ordered morphologies and interconnection of both the macropores and the mesopores were evidenced by the characterizations with SEM and TEM attached with electron diffraction. Nitrogen adsorption results also confirmed the interconnectivity, sizes and their distribution of the two sortsof pores. The effect of surfactant concentration and calcination conditions on mesopore size and its distribution was also investigated.

关键词： template synthesis bimodal porous silica three dimensional order bulk sol-gel process.

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基于牵引电机悬挂主焊缝的抗疲劳可靠性研究

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机车车辆工艺 2024年第3期60卷 17-21页

作者：石江杨振中李爽汤黎明中车株洲电机有限公司湖南株洲412001

为实现对悬挂主焊缝在不做去应力退火情况下的应用可靠性评估,文章以某型号牵引电机悬挂主焊缝为例展开,从主焊缝表层残余应力退火前后的应力数据对比、电机悬挂有限元仿真分析以及基于未经退火处理的电机悬挂实物台架试验,综合分析与评... 详细信息

为实现对悬挂主焊缝在不做去应力退火情况下的应用可靠性评估,文章以某型号牵引电机悬挂主焊缝为例展开,从主焊缝表层残余应力退火前后的应力数据对比、电机悬挂有限元仿真分析以及基于未经退火处理的电机悬挂实物台架试验,综合分析与评估,悬挂主焊缝在不去应力退火情况下其全寿命应用服役安全无问题。

关键词：牵引电机悬挂主焊缝残余应力可靠性

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Chemical Fingerprint for Identification and Quality Control of Saccharides in Danhong Injection Based on HPLC-ELSD with Chemometrics

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Chemical Research in Chinese Universities 2019年第5期35卷 782-787页

作者： LI Hao yang zhenzhong WANG Jiaojiao AN Yun WANG Chenchen GUO Xiaoguang WANG Yi Tianjin University of Traditional Chinese Medicine Tianjin 300193P.R.China College of Pharmaceutical Sciences Zhejiang UniversityHangzhou 310058P.R.China Heze Medical College Heze 274000P.R.China Shandong Danhong Pharmaceutical Co. Ltd.Heze 274000P.R.China

Chemical fingerprinting has been widely used for the quality control of complex natural products including traditional Chinese medicines and botanical drugs. However, there is still lack of appropriate method to monitor the batch-to-batch consistency of hydrophilic constituents, such as saccharides and oligosaccharides. In the present study, we developed a novel approach based on high performance liquid chromatography with evaporative light scattering detector(HPLC-ELSD) for establishing saccharide fingerprinting of Danhong Injection(DHI), which is a widely used botanical drug for treating cardiovascular diseases. Major saccharides in DHI were isolated and four compounds including fructose, glucose and two oligosaccharides were identified. The structures of two novel saccharides named glycerol-1-O-galactfpyranosyl-(1→4)-O-arabmofuranoside, and glycerol-1-O-galactpyranosyl-(1→4)[O-arabmfuranosyl-(1→3)]-O-arabinofuranoside were confirmed by NMR, HR-ESI-MS and GC-MS for the first time. The establishment approach was successfully applied to distinguishing 12 batches of DHI from other botanical drugs with the aid of principle component analysis as well as to evaluating batch-to-batch consistency with the help of calculating similarity of tmgerprints. Our findings indicate that the chemical fingerprint of saccharides can be a useful tool for the quality control of complex natural products.

关键词： Danghong injection Saccharide Fingerprint Carthami Flos

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Pickering emulsions stabilized by colloidal surfactants:Role of solid particles

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Particuology 2022年第5期20卷 153-163页

作者： Zhu Sun Xiaoxiao Yan Yao Xiao Lingjie Hu Max Eggersdorfer Dong Chen zhenzhong yang David AWeitz College of Energy Engineering and State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310027China Department of Medical Oncology The First Affiliated HospitalSchool of MedicineZhejiang UniversityHangzhou 310003China John A.Paulson School of Engineering and Applied Sciences Harvard UniversityCambridgeMA 02138USA Department of Chemical Engineering Tsinghua UniversityBeijing 100084China

Pickering emulsions are emulsions stabilized by colloidal surfactants,*** *** with traditional molecular suffactant-stabilized emulsions,Pickering emulsions show many advantages,such as high resistance to coalescence,long-term stability,good biocompatibility and tunable *** recent years,Pickering emulsions are widely applied in scientific researches and industrial *** this review,we focus on the influences of particle properties on Pickering emulsions,including particle amphiphilicity,concentration,size and shape,and summarize the strategies developed for the preparation of amphiphilic Janus *** applications of Pickering emulsions in food industry,cosmetic industry,material science,drug delivery,biomedical research and vaccine adjuvant will also be *** emulsions are a unique system for multi-disciplinary studies and will become more and more important in the future.

关键词： Emulsion Pickering emulsion Particle Colloidal surfactant Amphiphilicity

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Synthesis of 3-D ordered macroporous silicate using the template formed from monodispersed polystyrene latex

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Chinese Science Bulletin 2000年第11期45卷 992-994页

作者： Ql Kai yang zhenzhong WANG Lijun LIU Zhengping ZHAO Delu Polymer Physics Laboratory Center for Molecular ScienceInstitute of ChemistryChinese Academy of SciencesBeijing 100080China Department of Chemistry Beijing Normal UniversityBeijing 100875China

Based on the template formed from monodispersed polystyrene (PS) latex, a modified fast sol-gel process was employed to synthesize a three-dimensional ( 3-D ) ordered macroporous silica material after removing the template by calcination at high temperature. It was indicated that there existed highly ordered packed pores within the whole silica material by SEM morphology observation. It was also found that the pores were interconnected. The pore size could be controlled mainly by varying the particle size of the latex ranging from 101 to 102 nm. The formation process of the ordered pores was also preliminarily discussed.

关键词： monodispersed PS latex fast sol-gel process ordered macroporous material.

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Methylammonium cation deficient surface for enhanced binding stability at TiO2/CH3NH3PbI3 interface

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Nano Research 2017年第2期10卷 483-490页

作者： Xin Xu Kai Li zhenzhong yang Jiangjian Shi Dongmei Li Lin Gu Zhijian Wu Qingbo Meng Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China

Heterojunction interfaces in perovskite solar cells play an important role in enhancing their photoelectric properties and stability. Till date, the precise lattice arrangement at TiO2/CH3NH3PbI3 heterojunction interfaces has not been investigated clearly. Here, we examined a TiO2/CH3NH3PbI3 interface and found that a heavy atomic layer exists in such interfaces, which is attributed to the vacancies of methylammonium （MA） cation groups. Further, first-principles calculation results suggested that an MA cation-deficient surface structure is beneficial for a strong heterogeneous binding between TiO2 and CH3NH3PbI3 to enhance the interface stability. Our research is helpful for further understanding the detailed interface atom arrangements and provides references for interfacial modification in perovskite solar cells.

关键词： perovskite interfacial atomic structure scanning transmission electron microscopy (STEM) first-principles calculations

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