The climatic changes associated with solar variability are largely caused by variations in total solar irradiance and solar spectral irradiance with solar activity. Thus the spectral composition of solar radiation is ...The climatic changes associated with solar variability are largely caused by variations in total solar irradiance and solar spectral irradiance with solar activity. Thus the spectral composition of solar radiation is crucial in determining atomspheric structure. The variations in solar spectrum depend on the varied solar spots. Recently, evidence for a strong effect of solar activity on terrestrial isolation on ground-based measurements carried out by the National Research Institute of Astronomy and Geophysics (NRIAG), Helwan, Egypt (lat. 29?52'N and long. 31?20'E) during (1990-2000) were presented. Specifically, a strong increase of terrestrial isolation with sunspot number as well as a decline of the solar spectrum with solar activity was reported. Daily measurements of the solar radiation between 280 nm and 2800 nm were made by Eppley Pyranometer and Pyrheliometer instruments. The decreasing at the range 280 - 530 nm and 530 - 630 nm are represented less than 50% of direct solar radiation and the stability of at the range 630 - 695 nm and 695 - 2800 nm it mean that;some of difference radiation is appear in diffused radiation which allow to height of the temperature as much as the largest associated with significance as it appears from the curves of relative humidity.展开更多
CALS系统通过产品全寿命周期支持系统(Product Life-cycle Support System,PLSS)实现产品信息的高度共享,而产品全寿命周期数据模型(Product Life-cycle Data Model,PLDM)是PLSS系统的核心与关键。提出了CALS系统的全寿命周期过程模型,...CALS系统通过产品全寿命周期支持系统(Product Life-cycle Support System,PLSS)实现产品信息的高度共享,而产品全寿命周期数据模型(Product Life-cycle Data Model,PLDM)是PLSS系统的核心与关键。提出了CALS系统的全寿命周期过程模型,建立以PLDM为核心的PLSS系统和CALS系统的体系结构;介绍和分析了多色集合理论的建模方法和特点,提出应用递阶多色集合和有向多色图研究建立PLDM的数据模型与结构。展开更多
针对目前关于促进装备采办信息化的2种不同理念：持续采办和全寿命保障（continuance acquisition and life-cycle support,CALS）与产品数据管理（product data management,PDM）。在介绍其概念的基础上,从实施目的、范围和发展方向等...针对目前关于促进装备采办信息化的2种不同理念：持续采办和全寿命保障（continuance acquisition and life-cycle support,CALS）与产品数据管理（product data management,PDM）。在介绍其概念的基础上,从实施目的、范围和发展方向等方面比较其异同;在论述其主要工作的基础上进一步说明了它们之间的关系,论证了应用PDM实现CALS目标的可行性。最后针对现状,对利用CALS与PDM实现装备采办信息化提出几点建议。展开更多
文摘The climatic changes associated with solar variability are largely caused by variations in total solar irradiance and solar spectral irradiance with solar activity. Thus the spectral composition of solar radiation is crucial in determining atomspheric structure. The variations in solar spectrum depend on the varied solar spots. Recently, evidence for a strong effect of solar activity on terrestrial isolation on ground-based measurements carried out by the National Research Institute of Astronomy and Geophysics (NRIAG), Helwan, Egypt (lat. 29?52'N and long. 31?20'E) during (1990-2000) were presented. Specifically, a strong increase of terrestrial isolation with sunspot number as well as a decline of the solar spectrum with solar activity was reported. Daily measurements of the solar radiation between 280 nm and 2800 nm were made by Eppley Pyranometer and Pyrheliometer instruments. The decreasing at the range 280 - 530 nm and 530 - 630 nm are represented less than 50% of direct solar radiation and the stability of at the range 630 - 695 nm and 695 - 2800 nm it mean that;some of difference radiation is appear in diffused radiation which allow to height of the temperature as much as the largest associated with significance as it appears from the curves of relative humidity.
文摘CALS系统通过产品全寿命周期支持系统(Product Life-cycle Support System,PLSS)实现产品信息的高度共享,而产品全寿命周期数据模型(Product Life-cycle Data Model,PLDM)是PLSS系统的核心与关键。提出了CALS系统的全寿命周期过程模型,建立以PLDM为核心的PLSS系统和CALS系统的体系结构;介绍和分析了多色集合理论的建模方法和特点,提出应用递阶多色集合和有向多色图研究建立PLDM的数据模型与结构。
文摘针对目前关于促进装备采办信息化的2种不同理念：持续采办和全寿命保障（continuance acquisition and life-cycle support,CALS）与产品数据管理（product data management,PDM）。在介绍其概念的基础上,从实施目的、范围和发展方向等方面比较其异同;在论述其主要工作的基础上进一步说明了它们之间的关系,论证了应用PDM实现CALS目标的可行性。最后针对现状,对利用CALS与PDM实现装备采办信息化提出几点建议。
