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化学机械抛光中抛光垫的退化行为研究

润滑与密封 2025年第2期50卷 148-157页

作者：陈宗昱陈国美倪自丰章平陈国华江南大学机械工程学院江苏无锡214122 无锡商业职业技术学院机电技术学院江苏无锡214153 江苏省微纳增减材制造工程研究中心江苏无锡214122 无锡格锐德半导体科技有限公司江苏无锡214121

为提高化学机械拋光(CMP)后晶片之间和晶片内部的均匀性,研究抛光垫表面的退化行为及其对CMP加工的影响。通过抛光试验研究CMP过程中材料去除率和晶片表面质量的变化趋势;利用白光干涉仪和扫描电子显微镜观察抛光垫表面微观结构的演变,... 详细信息

为提高化学机械拋光(CMP)后晶片之间和晶片内部的均匀性,研究抛光垫表面的退化行为及其对CMP加工的影响。通过抛光试验研究CMP过程中材料去除率和晶片表面质量的变化趋势;利用白光干涉仪和扫描电子显微镜观察抛光垫表面微观结构的演变,并用表面高度正态分布曲线、表面粗糙度和孔隙率等参数对抛光垫表面形貌进行表征;模拟晶片和抛光垫之间的摩擦学行为,分析抛光垫退化行为对晶片加工的影响机制,并对材料去除模型中抛光垫微凸峰变形进行分析。结果表明:在连续1 h的CMP过程中(无修整),材料去除率的变化趋势表现为先增大后减小,表面质量则为先减小再增大,抛光20 min后,晶片表面的MRR达到最大值(873.43±65.53)nm/min,表面粗糙度达到最小值(1.13±0.08)nm;衬垫表面微观组织的动态变化大致经历快速变化期、相对稳定期、性能逐步退化阶段;CMP过程中抛光垫微凸峰处在弹塑性变形区间,理论计算结果与实际情况具有高度一致性。

关键词：化学机械抛光抛光垫摩擦磨损性能退化材料去除率

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家纺产品消费行为与营销策略研究

山东纺织经济 2025年第1期42卷 23-27页

作者：陈国华浙江欣墨科技有限公司浙江绍兴312000

本研究旨在深入了解家纺产品消费行为,并提出相应的营销策略,以满足不断变化的市场需求。家纺产品是人们日常生活中不可或缺的一部分,其消费行为受到多种因素的影响,包括个人喜好、生活方式、品牌忠诚度和市场趋势等。通过分析这些因素... 详细信息

本研究旨在深入了解家纺产品消费行为,并提出相应的营销策略,以满足不断变化的市场需求。家纺产品是人们日常生活中不可或缺的一部分,其消费行为受到多种因素的影响,包括个人喜好、生活方式、品牌忠诚度和市场趋势等。通过分析这些因素,可以更好地理解消费者在家纺产品领域的决策过程,从而制定更有效的营销策略。

关键词：家纺产品消费行为营销策略市场需求品牌忠诚度

Status and prospect of garnet/polymer solid composite electrolytes for all-solid-state lithium batteries

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Journal of Energy Chemistry 2020年第11期29卷 154-177页

作者： Liansheng Li Yuanfu Deng guohua chen The Key Laboratory of Fuel Cell for Guangdong Province School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510640GuangdongChina Electrochemical Energy Engineering Research Center of Guangdong Province South China University of TechnologyGuangzhou 510640GuangdongChina Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina

Solid polymer electrolytes(SPEs), such as polyethylene oxide(PEO), are characteristic of good flexibility and excellent processability, but they suffer from low ionic conductivity and small Li+transference number at ambient temperature. Inorganic solid electrolytes(ISEs), garnet-type Li7La3Zr2O12 and its derivatives(LLZO-based) in particular, possess high ionic conductivity at room temperature, wide electrochemical stability window, large Li+transference number as well as good stability against Li metal ***, lithium dendrites growth, interfacial contact issue and brittle nature of LLZO-based ceramic electrolytes prevent their practical applications. In response to these shortcomings, LLZO-based/polymer solid composite electrolytes(SCEs), taking complementary advantages of two kinds of electrolytes, and thus simultaneously improving the electrode wettability, ionic conductivity and mechanical strength, have been made to develop high-performance SCEs in recent years. Herein, the intrinsic properties and research progress of LLZO-based/polymer SCEs, including LLZO-based/PEO SCEs(LLZO-based/PEO SCEs with uniform dispersion of LLZO-based fillers and LLZO-based/PEO layered SCEs) and LLZO-based/novel polymers SCEs, are summarized. Besides, comprehensive updates on their applications in solid-state batteries are also presented. Finally, challenges and perspectives of LLZO-based/polymer SCEs for advanced allsolid-state lithium batteries(ASSLBs) are suggested. This review paper aims to provide systematic research progress of LLZO-based/polymer SCEs, to allow for more efficient and target-oriented research on improving LLZO-based/polymer SCEs.

关键词： Solid polymer electrolyte Garnet-type electrolyte Solid composite electrolyte All-solid-state battery

Variation of resistance and infectivity between Pseudomonas fluorescens SBW25 and bacteriophage Ф2 and its therapeutic implications

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Virologica Sinica 2015年第1期30卷 59-62页

作者： Hanchen chen guohua chen College of Biological and Pharmaceutical Sciences China Three Gorges University Collaborative Innovation Center for Geo-Hazards and Eco-Environment in Three Gorges Area Engineering Research Center of Eco-environment in Three Gorges Reservoir Region Ministry of Education China Three Gorges University

Dear Editor,Studies of the coevolutionary dynamics between Pseudomonas fluorescens SBW25 and bacteriophageФ2 can explore host resistance and parasite infectivity with applications in the ecological and therapeutic *** dynamics determine the efficacy of phage-based *** the study described here,bacterial resistance and phage infectivity fluctuated with culture

关键词： phage parasite declined poral Phage infective viewpoint spatially directional Figure

A self-repairing polymer-inorganic composite coating to enable high-performance Zn anodes for zinc-ion batteries

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Chinese Chemical Letters 2023年第12期34卷 375-380页

作者： Weijing Wu Yuanfu Deng guohua chen The Key Laboratory of Fuel Cell for Guangdong Province School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510640China Electrochemical Energy Engineering Research Center of Guangdong Province South China University of TechnologyGuangzhou 510640China School of Energy and Environment City University of Hong KongHong Kong 999077China

There are some critical issues hindering the practical applications of aqueous zinc-ion batteries(zIBs),although they possess high safety and low cost as one of promising energy storge devices,such as the Zn dendrite growth and the by-product of Zn_(4)SO_(4)(OH)_(6)-xH_(2)O(ZHS)resulted from some side reactions in a mild ***,a compact and self-repairing solid electrolyte interface(SEl)film,as labeled the PVDF-Zn(TFSI)_(2)-ZHS coating[The PVDF and Zn(TFSI)_(2)are polyvinylidene fluoride and zinc bis(trifluoromethanesulfonyl)imide,respectively],which turns the in-situ generated ZHS into a beneficial ingredient onto the pre-coated PVDF-based composite coating layer containing Zn(TFSI)_(2),was designed and fabricated by a simple doctor blade *** is shown that the SEl layer can effectively isolate Zn from the electrolyte and homogenize the Zn^(2+)flux,and thus effectively suppress side reactions and dendrites *** from the hybrid SEl layer,a symmetric cell exhibits a high cycling stability over 750h at 2.0 mA/cm^(2)and 2.0 mAh/cm^(2),and meanwhile,a full-cell,coupled with K^(+) pre-intercalationα-MnO_(2)(KMO)cathode,displays excellent rate performance,stable coulombic efficiency and an acceptable cycle *** work provides a feasible approach for simple and scalable modification of Zn anodes to achieve high performance.

关键词： Self-repairing Polymer-inorganic composite coating PVDF Zn(TFSI)_(2) Znanodes Zn-ion batteries

An improved LSE-EKF optimisation algorithm for UAV UWB positioning in complex indoor environments

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Journal of Control and Decision 2023年第4期10卷 547-559页

作者： Guantong Guan guohua chen College of Mechanical and Electrical Engineering Beijing University of Chemical TechnologyBeijingPeople’s Republic of China

With the increasing application of UAVs,UAV positioning technology for indoor complex environment has become a hot research issue in the *** traditional UWB positioning technology is affected by problems such as multipath effect and non-line-of-sight propagation,and its application in complex indoor environments has problemssuch as poor positioning accuracy and strong noise *** propose an improved LSE-EKF optimisation algorithm for UWB positioning in indoor complex environments,which optimises the initial measurement data through a BP neural network correction model,then optimises the coordinate error using least squares estimation to find the best pre-located coordinates,finally eliminates the interference noise in the pre-located coordinate signal through an EKF *** has been verified by experiments that the evaluation index can be improved by more than 9%compared with EKF algorithm data,especially under non-line-of-sight(NLOS)conditions,which enhances the possibility of industrial application of indoor UAV.

关键词： Indoor UAV positioning UWB BP neural networks least squares estimation extended Kalmanfiltering

乡村教育助推乡村振兴的路径及优化——基于扎根理论的政策文本分析

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继续教育研究 2025年第1期 70-76页

作者：王蓓蕾陈国华聊城大学教育科学学院山东聊城252000

乡村教育是乡村振兴的重要战略支撑,为乡村振兴战略提供坚实的人才保障和智力支撑,乡村教育兴则乡村兴。选择已经公布的31个省、自治区、直辖市省级层面有关乡村振兴的政策文本,运用扎根理论,对其中乡村教育的内容进行分析,绘制了乡村... 详细信息

乡村教育是乡村振兴的重要战略支撑,为乡村振兴战略提供坚实的人才保障和智力支撑,乡村教育兴则乡村兴。选择已经公布的31个省、自治区、直辖市省级层面有关乡村振兴的政策文本,运用扎根理论,对其中乡村教育的内容进行分析,绘制了乡村教育助推乡村振兴路径分析图。为促使乡村教育更好地助推乡村振兴,应优化乡村学校办学条件,实现乡村教育助推乡村振兴;加强乡村教师队伍建设,引导乡村教师参与乡村振兴;发展乡村中等职业教育,充实乡村振兴人才队伍;打造特色乡村课程体系,实现乡村教育与乡村振兴融合发展。

关键词：乡村教育乡村振兴扎根理论政策文本

Improved CICA Algorithm Used for Single Channel Compound Fault Diagnosis of Rolling Bearings

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Chinese Journal of Mechanical Engineering 2016年第1期29卷 204-211页

作者： chen guohua QIE Longfei ZHANG Aijun HAN Jin College of Mechanical and Electrical Engineering Beijing University of Chemical Technology School of Mechanical Engineering Beijing Institute of Technology

A Compound fault signal usually contains multiple characteristic signals and strong confusion noise, which makes it difficult to separate week fault signals from them through conventional ways, such as FFT-based envelope detection, wavelet transform or empirical mode decomposition individually. In order to realize single channel compound fault diagnosis of bearings and improve the diagnosis accuracy, an improved CICA algorithm named constrained independent component analysis based on the energy method （E-CICA） is proposed. With the approach, the single channel vibration signal is firstly decomposed into several wavelet coefficients by discrete wavelet transform（DWT） method for the purpose of obtaining multichannel signals. Then the envelope signals of the reconstructed wavelet coefficients are selected as the input of E-CICA algorithm, which fulfills the requirements that the number of sensors is greater than or equal to that of the source signals and makes it more suitable to be processed by CICA strategy. The frequency energy ratio（ER） of each wavelet reconstructed signal to the total energy of the given synchronous signal is calculated, and then the synchronous signal with maximum ER value is set as the reference signal accordingly. By this way, the reference signal contains a priori knowledge of fault source signal and the influence on fault signal extraction accuracy which is caused by the initial phase angle and the duty ratio of the reference signal in the traditional CICA algorithm is avoided. Experimental results show that E-CICA algorithm can effectively separate out the outer-race defect and the rollers defect from the single channel compound fault and fulfill the needs of compound fault diagnosis of rolling bearings, and the running time is 0.12% of that of the traditional CICA algorithm and the extraction accuracy is 1.4 times of that of CICA as well. The proposed research provides a new method to separate single channel compound fault signals.

关键词： compound fault diagnosis, energy method constrained independent component analysis(CICA) diserete wavelet transform(DWT)

Study of tribological properties and lubrication mechanism of surfactant-coated anthracite sheets used as lubricant additives

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Friction 2021年第3期9卷 524-537页

作者： Hailong LIU Yajing HUANG Yaozhu WANG Xiaomin ZHAO Danqing chen guohua chen College of Chemical Engineering Huaqiao UniversityXiamen 361000China College of Materials Science and Engineering Huaqiao UniversityXiamen 361000China

Anthracite sheets were coated by sorbitol fatty acid ester(span80)through ball-milling *** tribological properties of the span80-coated anthracite sheets as the additive in polyalpha olefin were evaluated through a series of friction tests using a four ball *** results revealed that the span80-coated anthracite sheets exhibited excellent dispersion stability in base *** addition,compared with base oil,the average coefficient of friction,wear scar diameter,and wear volume of modified oil at a mass fraction of 0.03%span80-coated anthracite sheets decreased by 45.39%,60.13%,and 95.95%,*** oil containing span80-coated anthracite sheets achieved good friction-reducing and anti-wear effects over a wide range of applied loads,temperatures,or rotating *** experiments were performed as *** results obtained using span80-coated anthracite sheets were superior to those obtained using pure *** lubrication mechanism was attributed to the synergistic action of the crystalline and amorphous carbon in anthracite sheets as they formed a protective film and played a mitigative role on the surface of friction pair,which mitigated the wear extent of the friction pair.

关键词： anthracite tribological properties lubricant additive protective film-mending effect