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排序方式: 共有89条查询结果,搜索用时 15 毫秒
1.
M. Elisabeth Paté-Cornell 《Risk analysis》1985,5(4):277-288
A probabilistic method is presented to evaluate the economic value of fire monitoring by closed circuit TV camera in petroleum refineries. The proposed model is restricted to the analysis of risk reduction in an area where fires can be caused either by pump failure or by failure of valves and lines. The benefits come from reducing the time during which the fire grows undetected. Fire growth and expected values of losses are analyzed by a Markov model that includes five phases: (1) active undetected growth, (2) detection, (3) fire growth at the beginning of the firemen's intervention, (4) fire control, and (5) fire extinction. The results (e.g., the expected net present value of the investment) show that the proposed monitoring investment is attractive for an illustrative example. 相似文献
2.
本文构建四省民族地区新型城镇化-旅游产业-生态环境协调发展评价指标体系,运用耦合协调模型、地理探测器和灰色预测模型展现、分析及预测四省民族地区新型城镇化、旅游产业与生态环境(以下简称“UTE”系统)协调关系及演进过程。研究发现2008-2018年该区域UTE系统协调水平不断优化上升,内部发展不均衡,差距进一步拉大;新型城镇化领先,旅游产业和生态环境滞后是总体特征;经济发展和生态环境改善是制约和影响耦合度的关键因素;未来协调度稳步提升,但演进速度区域差异明显。基于此提出尊重和保护文化环境为四省民族地区的发展基础、加强区域合作、构建区域发展协调保障机制的建议。 相似文献
3.
All 29 operators in the control room of a fire brigade performed test sessions during work and leisure time at 2-h intervals on a day with a 14-h night-shift, a day off and a day with a 10-h morning shift. The test sessions consisted of a visual search choice reaction time test and two Sternberg memory search tests (1 or 5 letters had to be memorized). Furthermore, the operators recorded their oral temperature and their subjective alertness before each test session. The subject also kept a diary of work and sleep times for 14 days. The circadian rhythm of body temperature was hardly changed by a single night-shift. Parallel to the body temperature, the subjective alertness fell significantly during the night-shift reaching a minimum value at 06:00 h. The mean reaction times increased non-significantly at the end of the night-shift and the results of the two Sternberg memory search tests showed no significant trends. The sleep of the operators after the night-shift was on average reduced to 5 hs 34 min. The results of subjective rating of alertness and reaction time test are interpreted as effects of the combined influences of circadian rhythmicity, sleep loss and time on professional task. Most results support the conclusion that a 14-h night-shift without extensive breaks is not acceptable. 相似文献
4.
D. Denteneer M. S. Keane 《Journal of the Royal Statistical Society. Series C, Applied statistics》2005,54(1):95-114
Summary. In an important class of problems involving mixture distributions, interest focuses on the mixture proportions, considering other possible parameters as nuisance parameters. We formulate a new variation on such problems that arose in a study on the link between the number of cells in a charge-coupled detector image sensor that turned defective because of cosmic radiation and the storage conditions of such sensors. In this variation, the component densities are bivariate, there are two classes and only a subset of the mixture proportions is of relevance. We propose a nonparametric method to estimate the relevant subset of the proportions and apply our method to the data in our study. 相似文献
5.
王瑞华 《淮海工学院学报(社会科学版)》2015,(1)
社火是我国北方春节期间的一项传统民俗活动。以宁夏回族自治区南部山区彭阳县的社火表演仪式为例,利用地方志材料和田野调查材料,描述并分析了当地的社火组织、表演仪式以及其中所反映的民俗心理。 相似文献
6.
通过将码分多址通信系统中的最佳多用户检测视为组合优化问题,利用遗传算法能全局寻优的优势,提出了一种基于并行遗传算法的去相关多用户检测器。理论分析和仿真表明:该多用户检测器无论是抗多址干扰的能力还是抗远近效应的能力都明显优于传统的检测器和去相关多用户检测器;由于采用了基于“联姻”策略的并行遗传算法,使这种多用户检测器更易于实时应用和硬件实现。 相似文献
7.
"这样的战士"是文化批判的战士而不是政治斗争的战士。"无物之物"是指的以封建礼教为基础的强大的封建专制文化。"无物之阵"是由被封建礼教文化浸润入骨的各式各样的人组成的社会。"无物"则没有象征意义。《死火》是以意象象征的诗意化方法表现的作者的一场激情与理智的对话,描绘了作者从充满热烈的改造社会的青春激情到陷入苦闷和再次燃起激情重新投入战斗的一段特殊的思想变化历程。 相似文献
8.
李培健 《宝鸡文理学院学报(社会科学版)》2012,32(2):42-47
文献中常有"炎汉"、"炎刘"的提法,其实准确地讲这仅指东汉。整西汉一朝,始终未立火德,前期是水德,中后期是土德。至于西汉后期极为盛行的火德,并未被定为法定徳属,直到光武帝时才"始正火德"。若以为"炎汉"即为两汉,则是对历史真相的曲解。 相似文献
9.
Peter Knauth Johannes Keller Gerhard Schindele Peter Totterdell 《Work and stress》2013,27(2-3):176-186
Abstract All 29 operators in the control room of a fire brigade performed test sessions during work and leisure time at 2-h intervals on a day with a 14-h night-shift, a day off and a day with a 10-h morning shift. The test sessions consisted of a visual search choice reaction time test and two Sternberg memory search tests (1 or 5 letters had to be memorized). Furthermore, the operators recorded their oral temperature and their subjective alertness before each test session. The subject also kept a diary of work and sleep times for 14 days. The circadian rhythm of body temperature was hardly changed by a single night-shift. Parallel to the body temperature, the subjective alertness fell significantly during the night-shift reaching a minimum value at 06:00 h. The mean reaction times increased non-significantly at the end of the night-shift and the results of the two Sternberg memory search tests showed no significant trends. The sleep of the operators after the night-shift was on average reduced to 5 hs 34 min. The results of subjective rating of alertness and reaction time test are interpreted as effects of the combined influences of circadian rhythmicity, sleep loss and time on professional task. Most results support the conclusion that a 14-h night-shift without extensive breaks is not acceptable. 相似文献
10.
李海英 《南京理工大学学报(社会科学版)》2012,25(3):39-43
悖论元素被看做是构成诗歌文本张力的最重要因素之一,田桑在诗歌《藏身于木箱的火》中则通过对记忆的书写向我们展示出悖论在世界、事物、诗歌与我们个体之间所造成的奇妙关系:诗中事物在逻辑构成上是悖论的,事物本性与人类情感是悖论的,诗对事物的敞开与蔽合之行动永远处在悖论之途中。在他的诗歌中对悖论的言说由诗歌本体延伸到对人类自身现世处境中诸多矛盾现象的思考,并进一步引发了我们对悖论之态度的思考。 相似文献