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Copyright of Machine Tool & Hydraulics is the property of Guangzhou Mechanical Engineering Research Institute (GMERI) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Machine Tool & Hydraulics is the property of Guangzhou Mechanical Engineering Research Institute (GMERI) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Machine Tool & Hydraulics is the property of Guangzhou Mechanical Engineering Research Institute (GMERI) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Mechanical Engineering is the property of Editorial Board of China Mechanical Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Plastics Science & Technology / Suliao Ke-Ji is the property of Plastics Science & Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Tunnel Construction / Suidao Jianshe (Zhong-Yingwen Ban) is the property of Tunnel Construction Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Mechanical Engineering is the property of Editorial Board of China Mechanical Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Carbon fiber reinforced plastics (CFRP) are widely used in aerospace and automobile field because of its advantages, such as high strength and excellent corrosion resistance. However, due to its heterogeneity and anisotropy, the machining process is more complex than machining of traditional metal materials, which can lead to serious tool wear. In order to address this issue, PCD milling cutters are selected to conduct T800 CFRP multi-directional laminates milling tests under cryogenic condition. And then, the effect of cutting parameters and jet temperature on wear band width of flank face VB are analyzed. The results show that VB decreases with the increase of the cutting speed and the feed per teeth, and smaller VB is obtained when coolants temperature is -50 °C . In addition, nonlinear fitting of the test results is carried out by MATLAB. The empirical model of mapping relationship between cutting parameters, coolants temperature and VB is obtained, which can provide key support data for T800 CFRP milling tool wear suppression and tool life prolonging. [ABSTRACT FROM AUTHOR]

The method of predicting the properties of compounds based on machine learning plays an important role in the virtual screening of materials discovery. Existing methods of traditional machine learning models have to manually extract features, which have problems such as difficulty in extract features and difficulty in processing Simplified Molecular Input Line Entry System (SMILES) codes. In order to solve these problems, this paper proposes an end-to-end graph neural network to predict the high temperature performance of resin materials. First, the SMILES code of the resin material is represented as a graph, where the vertices are atoms and the edges are chemical bonds. Then, the vector representation of the molecule is obtained by constructing the graph neural network of the molecular graph. Finally, a full connection neural network contains information such as molecular vector, environment, and conditions to predict the maximum temperature by regression model. Experiments of the resin material data set show that the end-to-end graph neural network model proposed in this paper has more than doubled the accuracy of model prediction compared with the traditional machine learning models. [ABSTRACT FROM AUTHOR]

In order to provide theoretical and practical basis for high-yield and high-efficiency mechanized cultivation of wheat, different wheat tillage and sowing compound operation machines were selected, and the effects of different mechanized tillage and sowing modes on wheat seedling growth and yield were studied with traditional tillage and sowing machinery and artificial sowing planting as control in this study. The results showed that the compound operation mode of LCB-10 wheat precision fertilization rotary tillage planter (mode 2) and the compound operation mode of biaxial layered cutting, fertilization and sowing, pressing and trenching (mode 1) had high operation efficiency, vegetation coverage and seedling emergence rate, large seedling leaf area and dry matter accumulation in the early stage of overwintering, high overwintering seedling robustness, large population panicles and total grains, high yield and good economic benefit, it was suitable for large-scale popularization. Among them, the operation efficiency of mode 2 and mode 1 was 0%-260%, 176.92%-620.0% higher than that of other modes, the average seedling emergence rate in two years was 6.77%-20.60%, 6.13%-19.87%, the average grain yield in two years was 9 894.38 kg/hm² and 9 689.64 kg/hm² respectively, which was 23.84%-42.90%, 21.28%-39.94% higher than that of other modes, and the average economic benefit in two years was 51.54%-112.68% higher than that of other modes 46.94%-106.23%. The sowing depth of model 2 was deep and the uniformity of seedling emergence was not high, while the seed dew rate of model 1 was relatively high. The vegetation coverage rate of 2BFG-10 (6) 230 rotary tillage intelligent fertilization planter compound operation mode (mode 4) was higher than that of mode 3 (LCB-10 wheat precision fertilization rotary tillage planter less no till drill mode) and mode 6 (traditional shallow rotary tillage and manual sowing mode), and the seedling emergence rate and seedling uniformity were higher than that of mode 3, mode 5 (traditional mechanical fertilization rotary tillage and sowing mode) and mode 6, the exposed seed rate was less than that of model 5 and model 6, the population dry matter accumulation is higher, the population panicle number, total grain number, yield and economic benefit at maturity were also significantly higher than that of model 3, model 5 and model 6, in which the average yield in two years was 7.01%-15.39% higher and the economic benefit was 14.23%-40.35% higher, which was also suitable for large-scale popularization and application. Although mode 6 had low mechanical and total investment cost and suitable sowing depth, it was not suitable for large-scale high-yield and high-efficiency production of wheat because of its high labor cost, low operation efficiency, high seed dew rate, poor seedling uniformity, few tillers per plant, few panicles at maturity, small panicle type and lowest yield and economic benefit. [ABSTRACT FROM AUTHOR]

Copyright of China Mechanical Engineering is the property of Editorial Board of China Mechanical Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Mechanical Engineering is the property of Editorial Board of China Mechanical Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Tunnel Construction / Suidao Jianshe (Zhong-Yingwen Ban) is the property of Tunnel Construction Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Mechanical Engineering is the property of Editorial Board of China Mechanical Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Hebei University of Science & Technology is the property of Hebei University of Science & Technology, Journal of Hebei University of Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

To improve the body stability and force balance on wheels of a lunar rover, a differential bar linkage was designed and the 3-dimensional simulation model of this mechanism on lunar rover was established by software ADAMS. The kinematics equations of the mechanism on a lunar rover model were given, and the calculation was carried out and contrasted with simulation. The results validate the correctness of the kinematics model and the mechanism's contribution to rover locomotion stability. Experimental results of a mechanism prototype on a rover agree well with the calculation and simulation results. [ABSTRACT FROM AUTHOR]