Science in China Ser. E Engineering & Materials Science最新文献_第2页

Friction-reducing and antiwear behavior of metal halide-stabilized linear phosphazene derivatives as lubricants for a steel-on-steel contact 金属卤化物稳定线性磷腈衍生物作为钢对钢接触润滑剂的减摩和抗磨性能

Science in China Ser. E Engineering & Materials Science Pub Date : 1900-01-01 DOI: 10.1360/04ye0001

Jiamei Zhu, Wei-min Liu, Yongmin Liang

{"title":"Friction-reducing and antiwear behavior of metal halide-stabilized linear phosphazene derivatives as lubricants for a steel-on-steel contact","authors":"Jiamei Zhu, Wei-min Liu, Yongmin Liang","doi":"10.1360/04ye0001","DOIUrl":"https://doi.org/10.1360/04ye0001","url":null,"abstract":"A series of novel metal halide-stabilized linear phosphazene derivatives were synthesized. The friction-reducing and antiwear abilities of the resulting products as the lubricants for a steel-on-steel contact were comparatively investigated on an Optimol SRV oscillating friction and wear tester. The morphology of the worn steel surface was observed on a scanning electron microscope, while the chemical states of some typical elements on the worn steel surface were examined by means of X-ray photoelectron spectroscopy. It was found that both the side branch structures and central metals influenced the friction-reducing and antiwear behaviors of the synthetic derivatives as the lubricants, which was related to the different adsorption activities of the organic compounds composed of different organic ingredients and metallic ions on a nascent metal surface. All the synthetic lubricants except for the iron (III) derivative showed increased antiwear abilities with increasing metallic ionic radius. A protective layer originated from the tribochemical reaction together with the adsorbed boundary lubricating layer containing organic fluorine compounds, nitrogen oxide, and Fe3(PO4)2 plays an important role in improving the friction and wear behavior of the steel-on-steel system.","PeriodicalId":391126,"journal":{"name":"Science in China Ser. E Engineering & Materials Science","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121597633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Modeling of dendritic growth in the presence of convection 对流条件下树突生长的模拟

Science in China Ser. E Engineering & Materials Science Pub Date : 1900-01-01 DOI: 10.1360/04ye0253

M. Zhu, T. Dai, Sung-Yoon Lee, C. Hong

引用次数: 16

Formation and migration of space charge packet in low density polyethylene

Science in China Ser. E Engineering & Materials Science Pub Date : 1900-01-01 DOI: 10.1360/04ye0286

F. Zheng, Yewen Zhang, Bin Gong, Jianwei Zhu, Changshun Wu

引用次数: 16

A new family of windows — convolution windows and their applications 一种新的窗口——卷积窗口及其应用

Science in China Ser. E Engineering & Materials Science Pub Date : 1900-01-01 DOI: 10.1360/03ye0531

Jie-qiu Zhang, Chang-hong Liang, Yanpu Chen

{"title":"A new family of windows — convolution windows and their applications","authors":"Jie-qiu Zhang, Chang-hong Liang, Yanpu Chen","doi":"10.1360/03ye0531","DOIUrl":"https://doi.org/10.1360/03ye0531","url":null,"abstract":"A new family of windows is constructed by convolutions via a few rectangular windows with same time width and is thus referred to as convolution windows. The expressions of the second-order up to the eighth-order convolution windows in both the time and frequency domains are derived. Their applications in high accuracy harmonic analysis of periodic signals are investigated. Comparisons between the proposed windows and some known windows with the same width shows that, when the synchronous deviation of data sampling is slight, the proposed ones have the least effect of spectral leakage. Therefore, the new windows are well suited for high accuracy harmonic analysis and parameter estimation for periodic signals. The error analysis and computer simulations show that the estimation errors, corresponding to frequency, amplitude and phase of every harmonic component of a signal, are proportional to the pth power of the relative frequency deviation in case of the pth-order convolution window is applied to windowing signal of approximately p cycles. By introducing real time adjustment in sampling interval, the proposed algorithm can adaptively trace signal frequency and lead to less sampling synchronous deviation. The proposed approach has the advantages of easy implementation and high measure precision and can be used in harmonic analysis of quasi-periodic signals whose fundamental frequency drifts slowly with time.","PeriodicalId":391126,"journal":{"name":"Science in China Ser. E Engineering & Materials Science","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121078971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Monte Carlo simulations of dense gas flow and heat transfer in micro- and nano-channels 微纳米通道中密集气体流动和传热的蒙特卡罗模拟

Science in China Ser. E Engineering & Materials Science Pub Date : 1900-01-01 DOI: 10.1360/03ye0511

Moran Wang, Zhixin Li

引用次数: 6

Method of accurate grinding for single enveloping TI worm 单包覆TI蜗杆的精密磨削方法

Science in China Ser. E Engineering & Materials Science Pub Date : 1900-01-01 DOI: 10.1360/04ye0266

Yuehai Sun, Huijiang Zheng, Q. Bi, Shuren Wang

引用次数: 4

Competitive growth of different phases in eutectic alloys under directional solidification 定向凝固下共晶合金中不同相的竞争生长

Science in China Ser. E Engineering & Materials Science Pub Date : 1900-01-01 DOI: 10.1360/04ye0301

Shuangming Li, B. Ma, Xiaoli Li, Lin Liu, H. Fu

引用次数: 9