Results 1 to 10 of about 835 (103)
Journal of Applied Ecology, Volume 58, Issue 10, Page 2287-2304, October 2021., 2021 Field boundary features have an important role in stabilising pollinator populations and pollination service in rotational systems, although maintenance of larger semi‐natural habitat patches may be more effective for stabilising less mobile solitary bee populations.
Emma Gardner +16 more
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Gaoya dianqi, 2023 为使高压断路器在运行期间达到最优经济效益，通过引入系统动力学建立高压断路器全寿命周期成本模型评估其经济寿命。由于故障成本随故障率波动而动态变化，为了准确描述实际检修对故障率的影响，通过引入“役龄回退因子”修正实际维修后的故障率函数。同时，基于高压断路器LCC模型求得其年均全寿命成本，进而确定高压断路器可获得最大经济效益的退役年限。通过算例仿真结果可知，基于系统动力学的高压断路器LCC模型能直观地反映高压断路器整个运行年限内全寿命周期成本及其构成因素变化过程，对高压断路器实际运行维护及退役具有参考借鉴意义。
吐松江·卡日 +5 more
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Design and application of a cable fixings for medical equipment (一种医疗设备用线路固定结构的设计与应用)
中西医结合护理, 2023 The poor management of wires may shorten the life cycle of the medical equipment and reduced work efficiency in medical workers. This paper introduced the structure and application of a cable fixings for medical equipment, which has been designed to ...
ZHANG Li (张莉) +4 more
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Jianzhu Gangjiegou Jinzhan, 2020 对装配式钢结构建筑和混凝土建筑进行了全寿命周期经济性分析。以济阳县第二实验小学教学楼项目工程为例,选取钢框架和混凝土框架两种结构体系搭配不同的外墙、楼板和内墙板等围护体系共计十种比较方案进行经济性研究,运用全寿命周期成本评价体系分别计算每种方案的初始成本、建设成本、维护成本、拆除成本和残值,发现装配式钢框架结构体系的全寿命周期成本均低于其他方案,装配式钢结构建筑具有更好的经济性与推广应用价值。
侯和涛 +5 more
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Ultrasound in Obstetrics &Gynecology, Volume 66, Issue 3, Page 290-297, September 2025.ABSTRACT Objective The purpose of this cost‐utility analysis was to model the clinical and economic impact of three cervical‐length screening strategies among low‐risk twin pregnancies: two‐step universal screening (at 18–20 and 20–22 weeks), one‐step universal screening (at 18–20 weeks) and no screening.
Y. Khaikin +4 more
wiley +1 more source
Integrative Conservation, Volume 4, Issue 1, Page 85-94, March 2025.Chromolaena odorata and Ageratina adenophora are invasive species in Southern Yunnan, China; they have very differing, yet overlapping, climate niches. Both invaders produce a large number of small pappus‐bearing achenes every year. They grow in, and their seeds are dispersed to, both suitable and marginal habitats.
Bin Wen +5 more
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The enigmatic life history of the bamboo explained as a strategy to arrest succession
Ecological Monographs, Volume 94, Issue 4, November 2024.Abstract Bamboos are perennial woody grasses that display an enigmatic mix of traits. Bamboo is highly shade intolerant like early‐successional trees. Without secondary xylem, bamboos cannot continue to grow once they reach a maximum height or replace xylem damaged by hydraulic stress and must instead replace each stem after a few years using ...
Aiyu Zheng, Stephen W. Pacala
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Gaoya dianqi, 2013 全寿命周期成本（life cycle cost,LCC）理论已应用于许多领域,并且取得良好的社会经济效益。电力开关设备全寿命周期成本分析常采用净现值法,但其中设备的运行维护以及故障成本通常在总成本中占相当大的比重,由于此部分费用是未来发生的费用而且设备实际运行情况是不确定的,采用盲数理论可以处理电力开关设备数据的不确定性,能够克服传统方法过于绝对化的问题。针对GIS和AIS两种开关设备备选方案进行了基于盲数理论的全寿命周期成本分析 ...
张慧娟, 赵庆生, 王英, 李凤霞
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Zhongshan Daxue xuebao. Yixue kexue ban, 1988 本文通过五个不同温度的实验,编制成蚊生命表。说明:①成虫前期发育历期随温度的上升而缩短;卵的存活率是影响成虫前期存活率的主要因素;②各个实验温度的成蚊存活率随年龄的增长呈恒定的百分率下降,其存活率曲线都与SlobodkinⅢ型相似;③成蚊预期寿命与温度呈负相关,回归系数b值均有显著性 ...
钟作良
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Jingshui jishu【目的】本文致力于突破膜生物反应器(MBR)膜寿命预测领域的技术瓶颈，即针对缺乏多维耦合的寿命评价指标体系及难以精准量化膜污染与膜性能衰减协同作用机制，构建科学的寿命预测方法体系。【方法】建立以比通量为膜性能衰减和寿命评价的核心指标，跨膜压差实时表征膜污染动态，累计产水量界定机械极限的三级指标体系。基于“理化性能衰减-功能极限判定-维护干预影响”的全生命周期理论框架，本文构建了集成比通量衰减法、累计产水量分析法及化学清洗强度评估法的寿命预测方法体系 ...
Yan Xin +6 more
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