排序方式: 共有15条查询结果,搜索用时 15 毫秒
1.
1985年以来,我们采用颈部硬膜外腔注药,选择性推拿按摩治疗颈椎病30例,其中神经根型14例、椎动脉型5例,脊髓型1例,混合型10例。经一年来随访,27例有效,无效3例(穿刺失败一例)。我们施行颈部硬外腔注入激素和局麻药物,能消炎消肿镇痛、减轻压迫,阻断了恶性循环。加上手法松解软组织挛缩,调整失稳颈椎位置解除压迫症状,因而获得较为满意的效果。 相似文献
2.
3.
随着“金色中环发展带”等战略的实施,上海再次掀起一波开发高潮;区域性中心的大量兴建,往往会在一个区域多个地块多个基坑同时开发、同时建设,庞大的基坑群需要在较短的时间内施工完成。基坑不同阶段不同程度的持续降水可能对周边环境造成不良影响,特别是在周边存在轨道交通等不利因素条件下,为减少群井降水对周边环境的影响,群坑降水的前期统筹设计及运行中的协调管理显得尤为重要。依托上海金鼎片区群坑项目降水实践,提出降水统筹设计及运行管理的理念,力求减少减压降水对相邻轨道交通的影响,根据现场群坑降水具体实施情况,结合实施过程中周边轨道交通的变形分析,总结群坑降水统筹设计及运行管理的经验。 相似文献
4.
《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(7):1103-1120
Carbody tilting is today a mature and inexpensive technology that permits higher train speeds in horizontal curves, thus shortening travel time. However, tilting trains run a greater risk of causing motion sickness than non-tilting ones. It is likely that the difference in motions between the two train types contributes to the observed difference in risk of motion sickness. Decreasing the risk of motion sickness has until now been equal to increasing the discomfort related to quasi-static lateral acceleration. But, there is a difference in time perception between discomfort caused by quasi-static quantities and motion sickness, which opens up for new solutions. One proposed strategy is to let the local track conditions influence the tilt and give each curve its own optimised tilt angle. This is made possible by new tilt algorithms, storing track data and using a positioning system to select the appropriate data. The present paper reports from on-track tests involving more than 100 test subjects onboard a tilting train. A technical approach is taken evaluating the effectiveness of the new tilt algorithms and the different requirements on quasi-static lateral acceleration and lateral jerk in relative terms. The evaluation verifies that the rms values important for motion sickness can be influenced without changing the requirements on quasi-static lateral acceleration and lateral jerk. The evaluation shows that reduced quantities of motions assumed to have a relation to motion sickness also lead to a reduction in experienced motion sickness. However, a limitation of applicability is found as the lowest risk of motion sickness was not recorded for the test case with motions closest to those of a non-tilting train. An optimal level of tilt, different from no tilt at all, is obtained. This non-linear relation has been observed by other researchers in laboratory tests. 相似文献
5.
汽车防抱死制动系统(简称ABS)是提高和改善汽车制动性能的重要途径。因此,通过介绍ABS的作用、发展历程及远大前景,简单说明ABS/EDS组成及原理;同时通过试验测试ABS通道和EDS通道的特性。可为今后研制开发ABS/EDS以及LTCS、ESP等液压装置奠定基础。 相似文献
6.
杭州地铁1号线江北风井基坑开挖深度为26.266m,共设置六道支撑,为目前杭州地区最深的基坑之一,基坑下部的圆砾层承压含水层是威胁基坑安全的重要因素之一。工程运用三维渗流理论,采用深井井点降水成功地解决了圆砾层承压问题。该文针对工程降水过程中建立的数值模型作了进一步的分析研究。 相似文献
7.
从设计、施工、材料和养护管理等方面,对沥青混凝土路面早期病害形成原因进行了系统分析。根据早期病害产生的原因.从设计、材料选择、质量控制和养护管理等方面提出了预防对策。 相似文献
8.
500名产业潜水员职业病调查 总被引:1,自引:0,他引:1
通过对500名从事不同作业类型的产业潜水员职业病调查,急性减压病和减压性骨坏死的发病率分别为45.20%和16.20%,并均以水产养殖业潜水员的发病率为高。急性减压病和减压性骨坏死是二种具有关联发病关系的疾病,发病原因主要是由于潜水后未减压或减压不足所致。遵守潜水作业规则和强调充分地减压能有效降低二者的发病率,及早地施行再加压治疗则能减少患者迁延症状的发生。 相似文献
9.
10.
空电联合制动是一种新的制动技术.由于其工况和所需条件相对复杂,需要一种中继装置用于转化、记录变化的压力信号为易于传输、控制的电模拟信号,文章研究、设计了一种压差转换装置,该装置能精确用于电力机车空电联合时空气制动力信号控制电制动力大小. 相似文献