基于Web of Science的国际篮球前沿与演进的可视化研究

以Web of Science核心合集所收录的与篮球运动主题相关的学术文献为数据来源,运用CitespaceII软件对数据来源的2 729篇研究论文及参考文献进行科学计量与可视化分析,探析当前篮球运动研究的国际前沿主题及其演进脉络.结果显示:篮球运动研究快速发展,研究的学科领域不断分化与交叉融合,涉及体育学、医学、心理学、社会学、信息科学等多个学科,多学科交叉融合研究的趋势已显著呈现;研究主要集中在美国、西班牙、英国、澳大利亚、加拿大、意大利等国家的综合性大学,关注对象为精英球员、女性及儿童、青少年运动员;并对涉及国际前沿的运动损伤康复(前交叉韧带相关研究为重点)—动态平衡与稳定性训练—振动训练、运动生理学反应与适应—大数据挖掘与高科技应用、精英运动员竞技状态—竞技水平发展7大主题的5次演进发展进行了研究.     

Effect of Silica Fume on Mechanical Properties of Concrete Incorporating Steel Slag Powder

This study investigated the effect of silica fume(SF) on mechanical properties of concrete incorporating steel slag powder(SSP). The compressive strength and splitting strength tests of concrete with different content of SF(0%, 4%, 8% and 12%) and of SSP(0%, 10%, 20%, 30% and 40%) were carried out, and the test results were analyzed and fitted. Obtained results showed that the brittleness, compressive strength and compressive strength discreteness of concrete increased due to the incorporation of SF. SSP weakened the compressive strength of concrete, which reduced within 10% when the content of SSP was less than 20%. SF and SSP showed synergistic hydration effect when they were mixed, and the optimal group was SF8 SSP30, whose compressive strength was close to that of plain concrete, and whose brittleness as well as discreteness of compressive strength were lower relatively. With the content of SSF and of SSP as variables, the tension-compression ratio and compressive strength of concrete can be well estimated by surface fitting.     

Wigner-Hough变换在电力系统谐波检测中的应用

提出一种在重排SPWVD分析的基础上结合Hough变换对谐波进行频域定位和时域估计的方法,并进行了计算机仿真,取得了较满意的结果.     

大学生应付方式、自信与心理问题的关系

采用分层随机抽样法考察了综合性高校大学生的应付方式、自信心理问题之间存在的关系.结果发现:解决问题、求助、自责、幻想、退避五种应付方式既可以直接影响个体的心理健康,也可以通过自信的中介作用间接影响心理健康,合理化通过自信的中介作用间接影响心理健康;解决问题、求助、合理化、退避对心理健康有积极作用,幻想和自责有消极作用.     

金与镓、汞、铑、铅、钨、钒和铜的浮选分离研究

在水溶液中,Au(Ⅲ)与溴化钾、四丁基溴化铵形成不溶于水的三元配合物,此三元配合物沉淀浮于盐水相上层形成界面清晰的液-固两相,当溶液中溴化钾、四丁基溴化铵的浓度分别为2.5×10-2 mol/L、2.0×10-3 mol/L,pH 2.0时,Au(Ⅲ)被定量浮选.Ga(Ⅲ)、Hg(Ⅱ)、Rh(Ⅲ)、Pb(Ⅱ)、W(Ⅵ)、V(Ⅴ)和Cu(Ⅱ)离子在该体系中不被浮选,实现了Au(Ⅲ)与这些离子的定量分离.     

关于知识管理思想来源的思考

从管理学、情报学以及知识管理与信息管理的关系等视角,探讨了知识管理的思想来源。     

基于平面变换的雷达脉冲信号分选算法

通过平面变换技术将雷达脉冲映射成平面矩阵,在分析周期信号在平面矩阵中重复特性的基础上,提出了一种周期性雷达信号分选的新方法--矩阵匹配法.针对以前搜索算法门限确定困难以及当信号密集且周期性信号数最较少时无法分选的缺点,该算法采用通过检索相似度序列的方法,实现自动分析最小显示周期并完成分选工作.仿真表明陔方法对周期信号具有很高的分选准确度,对PRI随机抖动雷达也具有一定分选能力.该算法检索速度快、计算简单且易于实现,具有广泛的工程应用前景.     

Safety analysis for thread pair clearance of safety mechanism of Three Gorges Project ship lift

The Three Gorges Project（TGP） ship lift employs 4 safety mechanisms, of which one consists of a rotary locking screw and a nut jaw column. The thread pair clearance（TPC） of safety mechanisms is set at 60 mm. Owing to influential factors,the TPC changes randomly in the upward/downward-stroke of the ship chamber. If it diminished to 0, the safety mechanism would be jammed, thus resulting in disastrous accidents. By the bearing test of the drive system, 7 influential factors have been studied; 15 other influential factors（including 8 factors of manufacture and installation deviation, 3 factors of chamber offset, 2 factors of external load and 2 factors of wear） have been analyzed based on the design data. Results by the limit superposition reveal that the TPC change varies from -43.8 mm to ＋48.4 mm when the water level of the chamber ranges from 3.4 m to 3.6 m. According to the Gaussian distribution, the probability of the TPC change varied from -53.7 mm to ＋58.8 mm in the most detrimental status is99.74%, therefore, the TPC remains in a safe condition. This paper puts forward that two-phase operation of the drive system should be adopted so as to reduce the maximum TPC change to -44.6 mm.     

Zr-APT新型吸附剂的除磷效果及吸附动力学研究

以凹凸棒石为载体,通过碱酸改性,并采用浸渍法制备了Zr-APT新型除磷吸附剂．对其吸附性能和最佳负载条件以及对吸附动力学过程进行研究．结果表明,在室温25℃和p H＝5．6的条件下,吸附时间为1h时,Zr-APT 对磷的去除率达94．3％;在pH＝5．6的条件下,当锆溶液浓度为0．4mol/L ,浸渍时间为12h时,所制得的 Zr-APT 新型除磷吸附剂除磷率达95．3％．该种吸附剂对磷的吸附过程符合一级吸附动力学模型．     

钢丝绳断丝声发射定量检测方法研究

采用声发射(ＡＥ)技术对钢丝绳断丝进行定量检测研究·通过波形分析确定合适的定时参数,从而将断丝事件表征为单个ＡＥ撞击信号,实现了断丝的定量化表示·通过二维图示方法选择特征参量,并根据断丝与非断丝类别的分布特点,采用多段线性分类器,以机器智能方式实现断丝的自动检测与识别·