高位复合顶板综采面矿压规律研究

针对高位复合泥岩顶板煤层回采期间顶板来压变化复杂等问题,结合离石煤矿4号煤顶板特厚复合特性,对其综采工作面实施矿压观测。研究表明:该类顶板周期来压步距差异大,来压步12.6 m,动压系数为1.33,来压强度沿工作面呈近似抛物线形分布,综采支架载荷强度频率符合正态分布特征。     

通过执行倒闸操作标准化程序预防误操作事故的发生

分析了误操作事故发生的原因,阐述了违章行为的主要表现,提出了倒闸操作的标准化程序存在的危险点及防范措施。     

数据库过量下载行为分析及规范

数据库过量下载在我国图书馆特别是高校图书馆频繁发生,引发了各界的广泛关注。对数据库过量下载行为进行了界定,分析了数据库过量下载行为的原因,提出了规范该行为的对策和建议。     

群机器人Flocking行为研究综述

主要回顾了群机器人自组织flocking行为的研究。首先,介绍群机器人学的含义及关键特征;然后,指出flocking行为在生物学上及机器人学上的意义,之后对目前的研究现状进行介绍。最后,按照以下的三个分类对群机器人flocking行为进行总结:行为控制,硬件设备及交流策略。     

纳米复合稀土永磁体Pr9-xDyxFe84.4-yCoyGa1Mn0.6B5（x=0,1,y=0,8）的反磁化行为和磁粘滞性

用电弧熔炼法制备了Pr9Fe84.4 B5Mn0.6 Ga1和Pr8Dy1Fe76.4 Co8B5Mn0.6 Ga1合金铸锭,然后利用熔体快淬法获得相应的薄带样品.分析了起始磁化,反磁化过程及样品的磁粘滞性,结果表明,两样品在室温下表现为单一硬磁相磁化行为,在低温下表现为双相行为.Co和Dy的联合添加使软磁相的晶粒尺寸减小,而晶粒间交换耦合作用增强,样品的形核场增大.磁粘滞性研究表明,Co和Dy联合掺杂的样品磁粘滞系数的增大是由软磁晶粒大小的减小导致热激活体积增加而引起的.     

基于旅客选择行为的航班时刻优化模型研究

为了使航空公司按照旅客的需要制定科学合理的航班计划,进一步提高旅客对航空公司的满意度,分析了航空旅客选择特性及对航班计划的影响,介绍了旅客计划延误成本的概念,并运用科学的方法建立了基于旅客选择行为的航班时刻优化模型,为航空公司进一步优化航班计划做了探讨。     

Influence of Mg_5Ga_2 compound on microstructures and electrochemical properties of Mg-5%Hg-22%Ga alloy

The Mg-5%Hg-22%Ga(mole fraction) alloy was melted.Aging at 573-673 K for different times was carried out to ensure the fine dispersion of the Mg_5Ga_2 compound.Scanning electron microscopy(SEM),X-ray diffractometry(XRD) and energy spectrum analysis(ESA) were employed to characterize the microstructures and phases of the Mg-5%Hg-22%Ga alloy.The electrochemical and corrosion behaviors of the above alloy were studied by potentiodynamic,galvanostatic and electrochemical impedance spectroscopy(EIS) measuremen...     

Cellulose nanocrystals as green fillers to improve crystallization and hydrophilic property of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)

The green nanocomposites of poly(3-hydroxybutyrate-co-3-hyd roxyvalerate) (PHBV) with various cellulose nanocrystals (CNCs) contents were prepared by solution casting method. Th e effects of CNCs on the crystallization behavior, spherulitic morphology, crystal structure and hydrophilic property of PHBV were studied by differential scanning calorimeter (DSC), polarized optical microscope (POM), wide-angle X-ray diffraction (WAXD) and static water contact angle measurement. It is found that the CNCs act as an effective nucleation agent for crystallization of PHBV, inducing an increase in the melt crystallization tempera ture of the nanocomposites. A study of the non-isothermal crystallizatio n kinetics further illustrated that overall crystallization rate of PHBV in the nanocomposites was faster than that of neat PHBV, but exhibited a decrease in the crystallinity and the spherulite size of PHBV. Furthermore, the contact angle decreased from 60.1° for neat PHBV to 32.5° for the nanocomposites with 10% CNCs (mass fraction).     

Corrosion and electrochemical behavior of as-cast Mg-5Y-7Gd-1Nd-0.5Zr magnesium alloys in 5% NaCl aqueous solution

The corrosion mechanism of the as-cast Mg-5Y-7Gd-1Nd-0.5Zr magnesium alloy immersed in 5% NaCl aqueous solution was investigated by electrochemical test and SEM. The electrochemical results indicate that the corrosion resistance of Mg-5Y-7Gd-1Nd-0.5Zr alloy in 5% NaCl aqueous solution gradually deteriorates with immersion time increasing from 2 h, 24 h, 60 h, to 108 h, which is consistent with th e SEM observation of corrosion morphologies. The Cl^-anion leads to the initiation and development of the corrosion pits, and Mg-5Y-7Gd-1Nd-0.5Zr alloy exhibits filiform type of attack under significant anodic control of magnesium solution reaction. The corrosion potential becomes noble with increasing immersion time.     

聚类算法在图书馆中的应用

依据图书馆的现有信息,结合数据挖掘的流行方向,应用聚类算法分析研究读者的借阅行为,获得对图书馆管理有用的信息,提高图书馆管理工作效率和资源利用率。