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291.
Xiao-feng Wang Ming-xing Guo Cun-qiang Ma Jian-bin Chen Ji-shan Zhang Lin-zhong Zhuang 《北京科技大学学报》2018,(8)
The effect of particle size distribution on the microstructure,texture,and mechanical properties of Al–Mg–Si–Cu alloy was investigated on the basis of the mechanical properties,microstructure,and texture of the alloy.The results show that the particle size distribution influences the microstructure and the final mechanical properties but only slightly influences the recrystallization texture.After the pre-aging treatment and natural aging treatment(T4 P treatment),in contrast to the sheet with a uniform particle size distribution,the sheet with a bimodal particle size distribution of large constituent particles and small dispersoids exhibits higher strength and a somewhat lower plastic strain ratio(r) and strain hardening exponent(n).After solution treatment,the sheet with a bimodal particle size distribution of large constituent particles and small dispersoids possesses a finer and slightly elongated grain structure compared with the sheet with a uniform particle size distribution.Additionally,they possess almost identical weak recrystallization textures,and their textures are dominated by CubeND {001}310 and P {011}122 orientations. 相似文献
292.
Kai Fu Xiaojing Jiang Yanru Guo Shuan Li Jie Zheng Wenhuai Tian Xingguo Li 《自然科学进展(英文版)》2018,28(3):332-336
A coupled experimental investigation and thermodynamic study of the yttrium-hydrogen(Y-H) binary system were carried out to provide more comprehensive and quantitative insights into the key thermodynamic properties of this system. Y-H system in the full range of H/Y = 0–3.0 was investigated by accurate pressure composition isotherm(PCI) measurement to provide credible phase equilibria information and thermodynamic data.The phase boundaries obtained were in agreement with previous experimental data but with improved accuracy.With the guide of the crystal structures, all the solid phases were modelled using the three sublattice model. The Y-H phase diagram and thermodynamic parameters were calculated and assessed with the CALPHAD technique.The obtained results are in very good agreement with our experimental data and the published data reported in literature. The obtained thermodynamic database of Y-H system can be used to predict the hydrogenation behavior and decomposition temperatures of hydrides. 相似文献
293.
Yunsong Zhao Chenguang Liu Yuanyuan Guo Yanfei Liu Jian Zhang Yushi Luo Dingzhong Tang 《自然科学进展(英文版)》2018,28(4):483-488
Boron is added into single crystal superalloys as a micro-alloying element to strengthen low angle grain boundaries.However,systematic investigations on the effect of boron on microstructures of single crystal superalloys are limitedly reported.The effect of boron on as-cast and heat-treated microstructures was investigated in two experimental Ni-based single crystal superalloys containing 3 wt% Re.The current results indicated that the volume fraction of(γ+γ′)eutectic and M_3B_2 borides was evidently increased,while the number of micropores was evidently decreased with the addition of 0.02 wt% boron.The(γ+γ′)eutectic could not be dissolved completely due to the lower incipient melting temperature caused by the formation of M_3B_2 borides.Meanwhile,the M_3B_2 borides were found to be enriched with indispensable strengthening elements Cr,Mo,W and Re,and this may lower the strengthening effect and cause stress concentration during high temperature creep. 相似文献
294.
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296.
在这篇文章中,我们引入并研究了Artin-代数上的半对偶化模对,它推广了由Miyashita定义的倾斜模对的概念.一方面,我们把有关半对偶化模的相关结论推广到了半对偶化模对上。另一方面在任意结合环R上,我们给出了半对偶化模的一个刻画. 相似文献
297.
以Z-164D为助磨剂,对广西田阳铝土矿进行了邦德球磨功指数试验和单轴抗压强度试验.结果表明:铝土矿经水和Z-164D溶液浸泡后,邦德球磨功指数分别下降了105%和379%,单轴抗压强度分别下降了2684%和4279%.红外光谱分析及X射线能谱微区元素分析表明,Z-164D只能在铝土矿表面发生物理和化学吸附,并不能够渗入铝土矿内部.建立了Z-164D溶液对铝土矿强度影响的作用机理模型,水分子与Z-164D相互促进,共同导致铝土矿缺陷程度增加、强度降低. 相似文献
298.
With the rapid growth of online shopping platforms, more and more customers intend to share their shopping experience and product reviews on the Internet. Both large quantity and various forms of online reviews bring difficulties for potential consumers to summary all the heterogenous reviews for reference. This paper proposes a new ranking method through online reviews based on different aspects of the alternative products, which combines both objective and subjective sentiment values. Firstly, weights of these aspects are determined with LDA topic model to calculate the objective sentiment value of the product. During this process, the realistic meaning of each aspect is also summarized. Then, consumers’ personalized preferences are taken into consideration while calculating total scores of alternative products. Meanwhile, comparative superiority between every two products also contributes to their final scores. Therefore, a directed graph model is constructed and the final score of each product is computed by improved PageRank algorithm. Finally, a case study is given to illustrate the feasibility and effectiveness of the proposed method. The result demonstrates that while considering only objective sentiment values of the product, the ranking result obtained by our proposed method has a strong correlation with the actual sales orders. On the other hand, if consumers express subjective preferences towards a certain aspect, the final ranking is also consistent with the actual performance of alternative products. It provides a new research idea for online customer review mining and personalized recommendation. 相似文献
299.
In this paper, PID (proportional-integral-derivative) controllers will be designed to solve the tracking problem for a class of coupled multi-agent systems, where each agent is described by a second-order high-dimensional nonlinear uncertain dynamical system, which only has access to its own tracking error information and does not need to communicate with others. This paper will show that a 3-dimensional manifold can be constructed based on the information about the Lipschitz constants of the system nonlinear dynamics, such that whenever the three parameters of each PID controller are chosen from the manifold, the whole multi-agent system can be stabilized globally and the tracking error of each agent approaches to zero asymptotically. For a class of coupled first-order multi-agent nonlinear uncertain systems, a PI controller will be designed to stabilize the whole system. 相似文献
300.
本文以第五次、六次人口普查数据为基础,将人均受教育年限作为切入点,在GIS软件支持下,采用标准差、变异系数、空间自相关分析法等,从地理学视角系统地分析了四川省人口文化素质的空间分布特征,得出3点结论,最后,有针对性地提出了相关建议。 相似文献