Effect of hand paddles and parachute on butterfly coordination

This study investigated the effects of hand paddles, parachute and hand paddles plus parachute on the inter-limb coordination of butterfly swimming. Thirteen male swimmers were evaluated in four random maximal intensity conditions: without equipment, with hand paddles, with parachute and with hand paddles + parachute. Arm and leg stroke phases were identified by 2D video analysis to calculate the total time gap (T1: time between hands’ entry in the water and high break-even point of the first undulation; T2: time between the beginning of the hand’s backward movement and low break-even point of the first undulation; T3: time between the hand’s arrival in a vertical plane to the shoulders and high break-even point of the second undulation; T4: time between the hand’s release from the water and low break-even point of the second undulation). The swimming velocity was reduced and T1, T2 and T3 increased in parachute and hand paddles + parachute. No changes were observed in T4. Total time gap decreased in parachute and hand paddles + parachute. It is concluded that hand paddles do not influence the arm-to-leg coordination in butterfly, while parachute and hand paddles + parachute do change it, providing a greater propulsive continuity.     

应用BP神经网络校正铂电阻温度传感器非线性的方法

本文应用BP神经网络算法对铂电阻温度传感器进行非线性校正，给出了BP神经网络的结构和训练权值的方法，在训练网络时对输入量进行了归一化处理。并应用此训练的网络对一实际的温度采集系统进行校正。此方法实现简单，大大方便了铂电阻温度传感器在温度测量中的应用。     

Molecular Mycobacteriology and Expansion in Disease Diagnosis

Molecular diagnostic tools for tuberculosis (TB) have evolved quickly with new innovations which can provide unprecedented opportunities for the rapid, sensitive and specific diagnosis of M. tuberculosis in clinical specimens and the status of its drug sensitivity. Microscopy and culture methods can not be replaced but the molecular assays can be applied in parallel with any new molecular tests for the diagnosis of TB. For extra pulmonary specimens, the use of the amplification methods is advocated, since rapid and accurate laboratory diagnosis is critical. Customization of the diagnostic usefulness of a molecular assay, according to the ease, reliability and need for health care sector is of immense value in a modern clinical mycobacteriology laboratory.     

基于数字PID控制的电阻自动测量系统

提出了一种基于单作微机数字PID控制的恒流源型电阻自动测量系统，可以自动调整量程，实现电阻的高精度、宽量程、快速而实时的测量。     

丙烯酸改性聚乙酸乙烯酯乳液的合成与性能

采用乳液聚合制备了新的丙烯酸改性的聚乙酸乙烯酯(PVAC)乳液。考察了丙烯酸改性的PVAC乳液的性能。研究结果表明：经改性后的共聚乳液，不仅提高了粘接强度和抗水性，而且可降低成本。     

作物节水研究进展

本文综述了作物节水研究的重大进展 :作物抗旱性鉴定方法、节水灌溉技术、化学节水技术、水肥耦合节水技术、深耕蓄水技术、农田覆盖节水技术及抗旱节水中的高新技术。     

关于电阻R的讨论

导体的电阻呈现出导体对电流的一种阻碍作用，这种阻碍作用不仅与导体本身的性质有关，同时还取决于导体中电流的流向。     

不同魔芋品种抗病性和丰产性试验研究

白魔芋抗病性强于花魔芋，花魔芋中，农林2号抗病性相对较强。本地魔芋产量较高，白魔芋产量最低。本地魔芋与农林2号产量差异不显，与白魔芋差异极显。播种前进行种芋消毒可明显提高出苗率，并楫现株率，提高产量，块茎膨大系数以本地魔芋较大，农林2号列第2，本地魔芋与农林2号差异不显，二均与白魔芋差异极显。膨大系数的高低是影响魔芋产量的主要原因。     

不同时期可溶性蛋白质含量与猕猴桃抗溃疡病之间的关系

实验以安徽省岳西县感、抗性不同的猕猴桃品种为研究对象,分别在2005-2006年的不同季节对它们一年生枝条韧皮部可溶性蛋白质含量与抗病性的表现进行相关性研究.结果如下:2005年10月和2006年1月测得可溶性蛋白质含量与相对感病指数之间存在着线性相关性,相关系数为-0.969,-0.887,线性回归方程分别为Y=8.712-50.718 X,Y=34.590-226.357X,且达到显著水平.