Since the 21st century,China's economy has enjoyed rapid development and people's living standards have been improved.At the same time,the pursuit of beauty of people is getting increasingly higher and landsca...Since the 21st century,China's economy has enjoyed rapid development and people's living standards have been improved.At the same time,the pursuit of beauty of people is getting increasingly higher and landscaping of and design of gardens has been widely pursued by people.This paper has discussed and analyzed the design of flower border and maintenance of flower border in the later period,hoping to provide some help and support for the relevant technical workers.展开更多
We present an overview of some recent developments in the area of mathematical modeling of maintenance decisions for multi-unit systems. The emphasis is on three main groups of multicomponent maintenance optimization ...We present an overview of some recent developments in the area of mathematical modeling of maintenance decisions for multi-unit systems. The emphasis is on three main groups of multicomponent maintenance optimization models： the block replacement models, group maintenance models, and opportunistic maintenance models. Moreover, an example of a two-unit system maintenance process is provided in order to compare various maintenance policies.展开更多
目的:目前关于中心静脉置管相关性血栓预防的内容涉及范围广且尚未形成系统的循证方案。本研究对化学治疗(以下简称“化疗”)患者经外周中心静脉导管(peripherally inserted central catheter,PICC)维持期深静脉血栓预防的相关证据提取...目的:目前关于中心静脉置管相关性血栓预防的内容涉及范围广且尚未形成系统的循证方案。本研究对化学治疗(以下简称“化疗”)患者经外周中心静脉导管(peripherally inserted central catheter,PICC)维持期深静脉血栓预防的相关证据提取汇总,评价后形成最佳证据,为临床护理实践提供循证依据。方法:通过PIPOST(population,intervention,professional,outcome,setting,type of evidence)法构建临床循证问题。检索乔安娜布里格斯研究所(Joanna Briggs Institute、JBI)、UpToDate、CINAHL、Cochrane Library、中国知网、万方、维普、Embase、PubMed、Sinomed、医脉通、美国输液护士协会网站中关于PICC维持期化疗患者相关深静脉血栓的相关指南、系统评价、专家共识、随机对照试验、临床决策、证据总结。检索时限为建库至2023年10月。由研究人员对所纳入的文献进行质量评价、证据等级划分,提取最佳证据。结果:最终纳入13篇文献,包括临床决策1篇、指南2篇、证据总结2篇、系统评价3篇、专家共识1篇、随机对照试验4篇。从评估、置管前中后、物理预防、药物预防、健康教育5个方面总结出36条最佳证据。结论:本研究总结了PICC维持期化疗患者相关深静脉血栓预防的最佳证据。医务人员和决策者可以结合具体的情况选择证据,以形成完整科学的护理管理策略,提升护理质量。展开更多
The aging of machine can be slowed and the life of machine can be increased by implementing periodic predictive maintenance. In this article,an improvement factor considering maintenance cost,age of machine and learni...The aging of machine can be slowed and the life of machine can be increased by implementing periodic predictive maintenance. In this article,an improvement factor considering maintenance cost,age of machine and learning effect in the process of maintaining is constructed to describe the effect of periodic preventive maintenance. The model of improvement factor can be fitted through health index. Based on improvement factor with infinite time,cost function including preventive maintenance cost,minimal repair cost and replacement cost is explored. The unit cost and the optimized maintenance time interval based on limit of reliability are deduced. The process of optimization and an example are given.展开更多
文摘Since the 21st century,China's economy has enjoyed rapid development and people's living standards have been improved.At the same time,the pursuit of beauty of people is getting increasingly higher and landscaping of and design of gardens has been widely pursued by people.This paper has discussed and analyzed the design of flower border and maintenance of flower border in the later period,hoping to provide some help and support for the relevant technical workers.
文摘We present an overview of some recent developments in the area of mathematical modeling of maintenance decisions for multi-unit systems. The emphasis is on three main groups of multicomponent maintenance optimization models： the block replacement models, group maintenance models, and opportunistic maintenance models. Moreover, an example of a two-unit system maintenance process is provided in order to compare various maintenance policies.
文摘目的:目前关于中心静脉置管相关性血栓预防的内容涉及范围广且尚未形成系统的循证方案。本研究对化学治疗(以下简称“化疗”)患者经外周中心静脉导管(peripherally inserted central catheter,PICC)维持期深静脉血栓预防的相关证据提取汇总,评价后形成最佳证据,为临床护理实践提供循证依据。方法:通过PIPOST(population,intervention,professional,outcome,setting,type of evidence)法构建临床循证问题。检索乔安娜布里格斯研究所(Joanna Briggs Institute、JBI)、UpToDate、CINAHL、Cochrane Library、中国知网、万方、维普、Embase、PubMed、Sinomed、医脉通、美国输液护士协会网站中关于PICC维持期化疗患者相关深静脉血栓的相关指南、系统评价、专家共识、随机对照试验、临床决策、证据总结。检索时限为建库至2023年10月。由研究人员对所纳入的文献进行质量评价、证据等级划分,提取最佳证据。结果:最终纳入13篇文献,包括临床决策1篇、指南2篇、证据总结2篇、系统评价3篇、专家共识1篇、随机对照试验4篇。从评估、置管前中后、物理预防、药物预防、健康教育5个方面总结出36条最佳证据。结论:本研究总结了PICC维持期化疗患者相关深静脉血栓预防的最佳证据。医务人员和决策者可以结合具体的情况选择证据,以形成完整科学的护理管理策略,提升护理质量。
基金the National Natural Science Foundation of China(Nos.50875168 and 50905115)
文摘The aging of machine can be slowed and the life of machine can be increased by implementing periodic predictive maintenance. In this article,an improvement factor considering maintenance cost,age of machine and learning effect in the process of maintaining is constructed to describe the effect of periodic preventive maintenance. The model of improvement factor can be fitted through health index. Based on improvement factor with infinite time,cost function including preventive maintenance cost,minimal repair cost and replacement cost is explored. The unit cost and the optimized maintenance time interval based on limit of reliability are deduced. The process of optimization and an example are given.
