共查询到20条相似文献,搜索用时 125 毫秒
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岁月是一条奔腾不息的河流,以年轮为刻度丈量着生命的短长。它用轻柔的手,缓缓抚过季节的琴弦,饱含深情地奏响了一曲又一曲大自然的赞歌。春夏秋冬,周而复始;寒署暖凉,时光流转。游走的风景中,浮生若梦,始终不变的是如火的热情。行进的人生里,光怪陆离,唯一永恒的是坚定的信念。时间轻轻地划过皮肤,有暖暖的温度,那是岁月低吟浅唱的留痕。秋天是冷清的,像是深入骨髓的一种特质,散发着季节的醇香。一场秋雨,一场凉。伴随着淅淅沥沥的雨丝,秋的韵味愈发浓厚。风萧瑟,雨缠绵。深秋的空气里总是飘荡着淡淡的离愁别绪,似乎在感怀悠悠岁月中那些无法忘却的思念。始料未及的是,这个十月的风雨来得太猛烈了一些。台风"菲特"的汹汹来袭,让我国东部沿海一带很多城市遭受重创。天灾无情,人有情。在抗击台风的战斗中,消防 相似文献
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“千山鸟飞绝,万径人踪灭。孤舟蓑笠翁,独钓寒江雪。”这是福州市公安局鼓楼交巡警大队案调中队中队长蓝国祚办公室的一幅宇。蓝国祚说,这是自己写的,“写得不好,练笔。”他笑笑。字的旁边,是一幅国画——《荷花》,也是蓝队长的作品。 相似文献
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闹闹7岁半了,她的越野历程与她的年龄相当。闹闹满月的那天,我们就驾车去了雪峰寺。在穿越联盟那激情燃烧的岁月,不到周岁的闹闹就参加了一次又一次的陷车活动。闹闹落地就与车有缘,上车就睡,停车就醒,下车就玩。周岁的时候,闹闹第一次长途跋涉到海南岛,她随车的表现非常优秀。从 相似文献
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Sylwia Krzemińska Teresa Nazimek 《International journal of occupational safety and ergonomics》2004,10(4):387-397
The paper presents the results of studies on selecting a solid sorption material for absorbing liquid crop protection agents which permeate samples of protective clothing fabrics. The sorption materials were investigated and selected with an assumption that they should have a high recovery coefficient for biologically active substances, used as active ingredients in crop protection agents, at a presumed, acceptably high level. The selected substances were determined with a gas chromatograph equipped with an electron capture detector (dichlorvos, cypermethrin and 2,4-D) and a nitrogen-phosphorus detector (carbofuran). The tests demonstrated that polypropylene melt-blown type unwoven cloth had high recovery coefficients for all 4 active ingredients proposed for the study. The highest recovery coefficient, -.97, was obtained for carbofuran. The recovery coefficients obtained for the 3 remaining substances were lower: .89 for cypermethrin and 2,4-D, and .84 for dichlorvos. 相似文献
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INTRODUCTION: In spite of recent advances in traffic surveillance technology and ever-growing concern over traffic safety, there have been very few research efforts establishing links between real-time traffic flow parameters and crash occurrence. This study aims at identifying patterns in the freeway loop detector data that potentially precede traffic crashes. METHOD: The proposed solution essentially involves classification of traffic speed patterns emerging from the loop detector data. Historical crash and loop detector data from the Interstate-4 corridor in the Orlando metropolitan area were used for this study. Traffic speed data from sensors embedded in the pavement (i.e., loop detector stations) to measure characteristics of the traffic flow were collected for both crash and non-crash conditions. Bayesian classifier based methodology, probabilistic neural network (PNN), was then used to classify these data as belonging to either crashes or non-crashes. PNN is a neural network implementation of well-known Bayesian-Parzen classifier. With its superb mathematical credentials, the PNN trains much faster than multilayer feed forward networks. The inputs to final classification model, selected from various candidate models, were logarithms of the coefficient of variation in speed obtained from three stations, namely, station of the crash (i.e., station nearest to the crash location) and two stations immediately preceding it in the upstream direction (measured in 5 minute time slices of 10-15 minutes prior to the crash time). RESULTS: The results showed that at least 70% of the crashes on the evaluation dataset could be identified using the classifiers developed in this paper. 相似文献
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针对飞机货舱火灾的探测延迟性问题,探讨了光学迷宫对点型光电感烟探测器响应性能的影响,实验研究了点型光电感烟探测器在有、无迷宫两种情况下烟雾探测的响应过程,对比分析了不同烟量时迷宫的作用,并提出探测器迷宫结构的改进设计思路。实验结果表明,在探测器响应过程中,有光学迷宫的探测器烟雾浓度波动幅度较小,迷宫对烟气有滞留作用,提高了探测器的稳定性;但迷宫会使探测腔室的烟雾浓度明显滞后且低于腔外,增大了探测器的迟滞时间,烟雾浓度较低时这种迟滞影响更为明显,严重影响货舱火警探测器的灵敏度。 相似文献
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潮湿引起感烟火灾探测器误报研究 总被引:1,自引:0,他引:1
针对潮湿现象成为典型的火灾探测误报源 ,在火灾探测综合模拟实验平台中 ,通过收集水沸腾形成的水雾进行加湿 ,研究了冬季与夏季潮湿环境 ,对散射型光电感烟火灾探测器的发生误报影响。通过比较探测器的输出值与其附近湿度变化曲线 ,从原理上分析了误报发生的原因。实验结果表明 :在气温较低的冬季 ,水蒸气较易形成液态小水珠 ,容易导致感烟探测器误报警 ,而在夏季由于气温较高 ,这种情况较难发生。对相对湿度较高或达到饱和湿度 ,以及非火灾因素的雾气或微细水珠 ,对感烟探测器可靠性的影响 ,开展下进一步的工作进行了展望 相似文献
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可燃气体报警器快速校准装置的研究 总被引:1,自引:1,他引:0
针对石化企业中可燃气体报警器校准工作存在着校准周期长、维护困难、准确性不能保证的现状,提出了一种通过将高浓度可燃气体物质经过定量稀释配制成用于可燃气体报警器标定的多种浓度气体物质的方法,并设计了一种由两路流量检测与控制模块和一个监控单元构成的可燃气体报警器快速标定装置。叙述了可燃气体报警器快速标定装置的原理、元器件构成、设计结构、流量控制方法和防爆措施的实现。 相似文献
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针对红外可燃气体探测器输出电压随温度变化,而又缺乏理论补偿公式的情况,提出采用BP神经网络对基于NDIR的可燃气体探测器进行温度补偿的方法,解决了以往温度补偿通过硬件补偿带来的探测器体积大、重量增加的弱点;与已有的软件补偿方法相比,BP神经网络方法通过对数据进行训练、学习获得温度补偿模型,得到了较好的结果,使得红外可燃气体探测器具有较宽的使用温度范围。 相似文献