跳远起跳中摆动腿动作功能规律之初探

就有关跳远起跳阶段摆动腿的摆动动作功能,运动生物学特征,及其产生的作用进行初步的探讨。     

基于机器学习的电磁脉冲相位特征挖掘算法

对电磁脉冲信号相位特征的准确挖掘和参量估计可以有效准确地确定信号源的方位,实现对识别目标的准确定位。传统的相位特征挖掘算法采用贝叶斯估计算法,算法在受到脉冲干扰时估计性能不好。提出一种基于机器学习的电磁脉冲信号相位特征挖掘算法,实现对相位估计精度的改进提高。首先构建电磁脉冲信号的模型,得到相位特征挖掘模型原始模型,求解相位模糊数搜索结合解得到两个阵列输出数据的相位差。计算电磁脉冲信号参数相位补偿项,采用机器学习算法进行电磁脉冲信号相位特征挖掘,构建调频信号作为估计目标方位角的载波信号,采用最小二乘拟合求斜率最终实现相位特征等相关信息的挖掘。仿真实验表明,该算法能准确估计出电磁脉冲信号辐射源的相位等参数信息,相位特征挖掘性能较好,展示了优越的数据挖掘和目标检测定位性能。     

地铁再生制动能量利用仿真研究

为了实现列车再生制动能量的有效利用,构建了逆变回馈型能量吸收装置的等效模型,结合平行多导体传输线和链式网络模型,在Visual c#.net平台开发了城市轨道交通直流牵引供电仿真系统。针对实际线路的牵引供电系统设计方案和运行图,给出了仿真结果,验证了逆变回馈装置的应用可以实现列车再生能量的有效利用,节约了牵引能耗,为优化城市轨道交通牵引供电系统设计方案提供了有效途径。     

Informing in-season tactical periodisation in team sport: development of a match difficulty index for Super Rugby

In team sports, tactical periodisation refers to the planned manipulation of training loads with the aim of prioritising athlete readiness for matches of greatest importance. Although monitoring of athletes’ physical condition is often used to inform this planning, the direct influence of external factors on match difficulty has not been well quantified. In this study, a ‘match difficulty index’ (MDI) for use in Super Rugby was developed, based on the influence imparted by five external factors on previous match outcomes. Specifically, information relating to match location, days break between matches, time-zone change and opposition ladder position (both current and previous year) were collected for matches played during the 2011–2013 Super Rugby seasons. Logistic regression analyses were used to assess the importance of each of these factors with respect to match outcome (win/loss), with opposition ladder position and match location (home, domestic away or international) exerting the greatest influence on match difficulty. Three separate cross-validated models were constructed, with match outcome classification performance reported as 66.2%, 65.5% and 63.7% respectively. The three MDI models emanating from this study can each be used to inform tactical periodisation program design both prior to and during the regular season.     

混沌时间序列及MATLAB仿真实现

在非线性系统中,存在着一种非常特殊的系统,即混沌系统,是一种介于确定关系和随机关系之间的状态。文章首先阐述了混沌的基本概念,然后对嵌入维数m和延迟时间τ这两个参数的选取方法做了简要介绍;列举了几个典型的混沌模型,并运用MATLAB软件对其进行仿真实现。     

Lambert W函数性质及其应用

介绍了Lambert W函数的代数及图像性质,如该函数的级数展开式、微分及函数在复平面的图像等。总结了其在数学、物理、化学和生物等领域的应用情况。     

烃类水合物高压密相波形板壁防火材料设计

设计防火材料中,对防火特性基质的合成材料的设计研究是关键,烃类水合物在持续受热条件下具有较好的阻燃性能,烃类水合物是由碳和氢两种元素组成的有机化合物,是具有一定潜质的选材原料。为解决烃类水合物高压密相波形板壁隔热防火材料设计中关键技术问题,开展对烃类水合物高压密相波形板壁隔热防火材料设计的研究和实验工作,采用高压密相波形板壁设计方法,合成出Ui O-66(Zr)烃类水合物隔热防火材料。基于变压吸附分离技术,分析材料的热稳定性、化学稳定性、力学稳定性和热降解特性。利用烃类水合物高压密相波形板壁隔热技术实现对高热稳定和水稳定的隔热防火材料研究。实验得出,当样品升温速率低于加热系统的升温速率,样品受到外部加热的作用,发生破乳和水分挥发,实现阻止燃烧的功效,有效提高阻燃性能,采用该隔热防火材料,阻燃和耐高温性能较优越。     

江苏省高校特色数据库建设现状资源与策略——以江苏省高等教育文献保障系统三期特色数据库建设为例

对江苏省高等教育文献保障系统三期特色数据库建设情况进行调查,以该期17个特色数据库为例,探讨当前高校特色数据库建设中存在的问题,提出高校特色数据库建设可持续发展的建议。     

Abnormal gel flotation in a patient with apperant pneumonia diagnosis: a case report

Introduction:

Serum blood collection tubes with separator gel are widely used by many laboratories for chemistry analyses. We describe a case of a primary blood collection tube filled with blood sample and a floating separator gel.

Materials and methods:

The blood sample was collected from a 51 years old female in intensive care unit with the diagnosis of pneumonia into a BD Vacutainer SST tube (Becton Dickinson, NJ, USA) containing serum separator gel and conveyed to the core laboratory of Marmara University Hospital within 30 minutes from collection. Sample was immediately centrifuged at room temperature at 1500 × g for 10 minutes.

Results:

The analyses revealed a highly increased total protein concentration of 145 g/L (reference interval 64–83 g/L). The nephelometric analyses showed an elevated serum IgG concentration of 108 g/L (reference interval 6.5–16 g/L) and IgG lambda monoclonal band was determined by serum immunofixation electrophoresis.

Conclusion:

Limitation of the separator gel tubes in patients with a high plasma density and its possible effects on test results and laboratory costs should be remembered. The clinical diagnosis stated in the information system should also reveal known comorbid conditions besides the apparent admission reason. This information would avoid resampling, additional testing, and communication efforts with the clinicians.     

连续性制动在旋梯、固定滚轮训练中的研究

通过在训练中采取连续性制动与传统的制动方式进行对比研究,表明连续性制动方式优于传统的制动方式,能够有效地提高训练成绩,促进飞行学员的空间定向能力,从而提高飞行学员的培养质量。