在高中物理教学中,DIS实验变得越来越重要,本文介绍了用DIS实验观察弹簧振子在竖直方向上的振动情况,通过实验操作、观察分析、数据处理,阐明弹簧的弹力与回复力之间的关系,并计算出弹簧劲度系数κ的值,使学生更加直观地理解不同弹簧有着不同的劲度系数.笔者通过对弹簧振子的传统实验以及DIS实验的对比,不仅验证了竖直方向上形变量与回复力成正比,还对实验进行了改进与创新,总结出了使用DIS实验的优点.

The importance of DIS experiment has been increased generally in physics classroom teaching in senior high school .In this paper , we introduce the observation of vibration of spring oscillator in the vertical direction with DIS experiment .By means of experimental operation ,observation ,analysis and data processing ,we clarify the relation between the elastic force of the spring and the restoring force ,and calculate the value of stiffness coefficient ,which will make students understand more directly why the different springs have different stiffness coefficient .According to the comparison between traditional experiment and DIS Lab ,we can not only verify that the deformation degree is proportional to the restoring force in the vertical direction ,but also give the improvement and innovation of the experiment with the advantages of using DIS Lab in teaching .

在本文中，主要阐述了DIS实验系统在电子电路实验教学中的优势。 DIS实验系统借助于传感器、数据采集器和计算机等先进信息技术工具优化传统实验环境，把实验过程变得易于操作，使电路中的物理规律变得易于理解和掌握。同时为学生的探究实验提供更多的途径和工具，更新、丰富了电子电路实验教学的内容。

This paper mainly elaborates the advantages of DIS experimental system in electronic circuit experiment teaching. With the aid of the tool sensor, data collector and the computer and other advanced information technologies,DIS experimental system optimizes the traditional experimental environment, and makes the experimental process easy to operate, so that the laws of physics in the circuit become easy to understand and master. At the same time, this paper provides ways and more tools for students'' inquiry experiments, updating and enriching the content of electronic circuit experiment teaching.

使用悬挂螺旋弹簧牵动磁体振动，在线圈内产生感应电动势的方法，将弹簧的机械振动转换为电磁振动，使弹簧机械振动的各参量转换为一一对应的电磁参量，用DIS数字化信息系统测量各电磁参量，从而展开分析研究。

in this paper,the use of suspension coil spring vibration affects the magnet,method of induc-tion electromotive force generated in the coil,convert the mechanical vibration spring for electromag-netic vibration,the parametric spring mechanical vibration,is converted into electromagnetic parame-ters correspond to the one one,with the DIS digital information system for measuring the electromag-netic parameters,so as to analyze and research.

探讨每日唤醒(DIS)应用于神经科行机械通气重症患者中的效果。方法:将符合纳入标准的80例患者按随机数字表法分为观察组(每日唤醒)和对照组(持续镇静)各40例,观察两组机械通气时间、人工气道留置时间、ICU住院时间和护士工作负荷的差异。结果:观察组患者机械通气时间、人工气道留置时间和ICU住院时间低于对照组,但差异无统计学意义(P0.05);而护士工作负荷明显高于对照组,差异有统计学意义(P0.01)。结论:DIS不能显著减少神经科重症患者的机械通气时间、人工气道留置时间和ICU住院时间,同时增加护士临床工作量,故DIS不适用于神经科重症患者。

Objective:To investigate the effect of daily interruption of sedation to critially ill patients with mechanical ventilation in the department of neurology .Methods:80 patients who meet the inclusion criteria were randomly divided into the observation group ( daily inter-ruption of sedation ) and the control group ( continuous sedation ,40 cases in each group ) .The differences of the duration of mechanical ven-tilation,the retaining time of artificial airway ,length of stay in ICU and workload of nurses were observed in both groups .Results:The dura-tion of mechanical ventilation ,the retaining time of artificial airway and length of stay in ICU were shorter in the observation group than the control group,but the differences were not statistically significant (P>0.05);the workload of nurses was significantly heavier in the obser-vation group than the control group (P<0.01).Conclusion:Daily interruption of sedation can not significantly reduce the duration of me-chanical ventilation ,th

目的：应用速度矢量成像技术(velocity vector imaging，VVI)技术评价正常人群左室扭转-位移环随年龄增长的变化特点，为临床提供评价左心功能的新方法。方法：98例健康志愿者(18~75岁)按年龄分为3组：第1组年龄≤30岁，34例；第2组年龄31~60岁，36例；第3组年龄≥60岁，28例。使用二维超声心动图采集所有受试者左室心尖和心底短轴切面图，VVI软件脱机分析每一切面的左室扭转运动和短轴位移，测量并计算左室扭转角度峰值(peak twist，Ptw)、最大解旋速度(peak untwist velocity，PutwV)、等容舒张期解旋百分比(the proportion of untwist in isovolumetric relaxation period，Iutw%)、左室径向位移(LV radial displacement，Dis)，构建扭转-位移环，并比较不同年龄组扭转-位移环的特点。结果：Ptw随年龄增加而增大。PutwV在30~60岁组最大。Iutw%在60岁之前随年龄增加逐渐增大，60岁以后随年龄增加而减小；Dis在3组间的差异无明显统计学意义。左室扭转-位移环的特征象一个“8”字形结构，收缩期的扭转和位移呈线性关系，其斜率随年龄增加而逐渐增大。在舒张早期，伴随解旋出现的径向扩张位移相对较小，导致各组的扭转-位移关系曲线较为陡直，舒张中晚期随着扩张径向位移的逐渐增大，扭转-位移环曲线趋向平坦。结论：VVI能有效、无创地评价左室扭转-位移环随年龄的改变，提供左心功能重要信息；使用扭转-位移环评价左心功能时要考虑年龄的影响。

Objective:To assess effect of age on the characteristic of letf ventricular (LV) twist-displacement loop in health volunteers by velocity vector imaging (VVI) and to provide a new method for LV function evaluation in clinic. Methods:Atfer obtaining basal and apical LV short-axis images in 98 healthy volunteers (18-75 years old) by 2-dimensional echocardiography, we use VVI sotfware to analysis LV twist motion and radial displacement at each plane off-line. hTe peak LV twist (Ptw), the peak untwist velocity (PutwV), the proportion of untwist in isovolumetric relaxation period (Iutw%) and LV radial displacement (Dis) were measured and calculated. Then we constructed LV twist-displacement loop and compared the characteristic of them among different groups. Results:Ptw increased gradually with the increase in age. The biggest PutwV was in the group of 30-60 years old. Iutw%increased gradually before 60 years old, then decreased atfer that. Dis was not obviously different among the three gr