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水泥稳定碎石施工质量影响因素及管控
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作者 蒋新民 《江西建材》 2015年第2期148-148,共1页
经过多年的研究以及实践,水泥稳定碎石施工被大量的应用于公路建设过程中,并且获得了一定的成绩,也在公路建设中起到重要的作用。文章通过全面了解水泥稳定碎石施工从而展开对于建设过程中,对质量有一点影响到因素展开论述,并且最终给... 经过多年的研究以及实践,水泥稳定碎石施工被大量的应用于公路建设过程中,并且获得了一定的成绩,也在公路建设中起到重要的作用。文章通过全面了解水泥稳定碎石施工从而展开对于建设过程中,对质量有一点影响到因素展开论述,并且最终给出相应的控制方案,以此希望可以为公路建设施工提供一些有力的参考意见。 展开更多
关键词 水泥稳定碎石 质量控制 影响管控
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基于vSEIdRm模型的人口迁移以及离汉交通管控对新冠肺炎疫情发展的影响分析 被引量:3
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作者 顾嘉 陈松蹊 +1 位作者 董倩 邱宇谋 《统计研究》 CSSCI 北大核心 2021年第9期114-127,共14页
不同于传统(Susceptible-Exposed-Infected-Removed)SEIR流行病传播动力学模型,本文在近期研究的Varying Coefficient Susceptible-Exposed-Infected-Diagnosed-Removed(vSEIdR)模型基础上加上人口迁徙(Migration)模块,设计开发了vSEIdR... 不同于传统(Susceptible-Exposed-Infected-Removed)SEIR流行病传播动力学模型,本文在近期研究的Varying Coefficient Susceptible-Exposed-Infected-Diagnosed-Removed(vSEIdR)模型基础上加上人口迁徙(Migration)模块,设计开发了vSEIdRm模型,该模型考虑了跨区域人口迁徙对疫情传播的影响,并允许流行病传播参数随时间变化。本文首先对人口迁移数据进行统计分析,建立其与各省新冠肺炎疫情发展的联系。之后,基于vSEIdRm模型估计了疫情初期各省份来自武汉的输入病例数,并定量刻画了离汉交通管控的效果。研究结果显示,离汉交通管控措施有效地减少了各省份的疫情规模。 展开更多
关键词 流行病动态传播模型 人口迁徙 离汉交通管控影响
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Political Implications of Emergency Management
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作者 Talya D. Thomas 《Journal of Environmental Science and Engineering(B)》 2012年第3期397-402,共6页
This paper will review three broad types of political implications of emergency management, since historically emergency management was considered only a function of law enforcement and fire departments, with the supp... This paper will review three broad types of political implications of emergency management, since historically emergency management was considered only a function of law enforcement and fire departments, with the support in the event of a major catastrophe from public health and civil defense organizations. The issue is not whether governments will be required to respond to emergencies but rather when and how frequently. The time to think about emergencies is before they happen. Despite some significant weakness in the overall approach, political implications offer many benefits and provide various options for CDCs (community development corporations) to get involved in disaster recovery and emergency management. Based upon a generally positive evaluation, the paper concludes that emergency management must become a central activity, whether at the federal, state, or local or as an intergovernmental activity. Hopefully for the future the government does not have to wait for a disaster to strike for one to put a policy into place, since they have had several to occur over decades. The government should be ready to take on any disaster if it occurs with the following policies and procedures that are in place. 展开更多
关键词 Emergency management public policy political implications.
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Preparation and optical properties of GaSb nanoparticles embedded in SiO_2 composite films 被引量:1
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作者 刘发民 张立德 +1 位作者 贾俊辉 姜治 《Science China Mathematics》 SCIE 2001年第9期1162-1166,共5页
The composite films of GaSb nanoparticles embedded in SiO2 matrices were fabricated by radio-frequency magnetron co-sputtering. Transmission electron microscope and X-ray diffraction pattern indicate that the GaSb nan... The composite films of GaSb nanoparticles embedded in SiO2 matrices were fabricated by radio-frequency magnetron co-sputtering. Transmission electron microscope and X-ray diffraction pattern indicate that the GaSb nanoparticles were uniformly dispersed in SiO2 matrices. Room temperature transmission spectra exhibit a blue shift of about 2.73 eV. The blue shift increases with decreasing size of GaSb nanoparticles, suggesting the existence of quantum size effects. Room temperature Raman spectra show that there is a larger Raman peak red shift and broadening of the composite films than that of bulk GaSb. This phenomenon is explained by photon confinement effect and tensile stress effect. 展开更多
关键词 GaSb/SiO2 compite films RF magnetron co-sputtering optical properties quantum confinement theory tensile stress effect
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