海上漂浮输油软管是目前海上油田进行外输作业的重要设备,对海上漂浮输油软管进行受力分析对海上软管的安全运行具有重要作用。建立了1个软管组与浮筒相连接的整体静态力学模型。考虑管组中首管和主管的影响,在重力和浮力载荷的作用下,...海上漂浮输油软管是目前海上油田进行外输作业的重要设备,对海上漂浮输油软管进行受力分析对海上软管的安全运行具有重要作用。建立了1个软管组与浮筒相连接的整体静态力学模型。考虑管组中首管和主管的影响,在重力和浮力载荷的作用下,推导获得了漂浮管组垂向形态及所受弯矩分布函数关系。研究结果表明:作用在管组上的载荷是关于自重、外径以及海水密度的函数;漂浮管组在静态载荷作用下,最大弯矩发生在浮筒和首管接口法兰处,且最大值为52.4 k N·m,最大弯曲主要取决于软管抗弯刚度、管组与浮筒管汇接口的倾斜角;首管相对于主管在竖直平面内发生较大位移,首管的最大位移为1.2 m。计算结果为软管组几何构型的设计提供了一定的理论依据,为其动态性能分析奠定了基础。展开更多
The vertical fluxes and vertical transferring forms of 18 rare elements were studied for the first time in the coral reef ecosystem of Nansha Islands, South China Sea, by deploying sediment traps. The results showed t...The vertical fluxes and vertical transferring forms of 18 rare elements were studied for the first time in the coral reef ecosystem of Nansha Islands, South China Sea, by deploying sediment traps. The results showed that the vertical transferring flux of most of the measured rare elements in Yongshu lagoon were higher than that in Zhubi lagoon. The vertical transferring forms of rare elements were mainly in the carbonate form, but Ta, As, Th mainly in the ion exchange form, Ag in iron manganese oxide form and Sb in the organic matter+sulphide form. None of the 18 rare elements was transferred mainly in the form of detritus silicate to sea floor. This proved that rare elements originating from the earth’s crust were redistributed in sinking particulates after they were brought into ocean. The relation between the fluxes and surface seawater temperature (STT) was also studied. The sensitivity of rare elements to SST was in order: Rb>V>As>Ti>U>Zn>Sb>Hf>Ag>Cs.展开更多
The purpose of this study was to identify the availability of authoring tools that support vertical flow function based upon empirical experiments. There were five EPUB authoring tools selected for this study. Four ma...The purpose of this study was to identify the availability of authoring tools that support vertical flow function based upon empirical experiments. There were five EPUB authoring tools selected for this study. Four major editing procedures were designed for the project. The first was the support of Chinese character input. The second was vertical form editing. The third was ruby position editing, and finally, testing whether the editing software was capable of outputting a document as an e-Book in EPUB 3.0 format. Five programs were tested, and only one of the five was able to fulfill the aforementioned requirements. The usability of each program is positively verified through this study.展开更多
文摘海上漂浮输油软管是目前海上油田进行外输作业的重要设备,对海上漂浮输油软管进行受力分析对海上软管的安全运行具有重要作用。建立了1个软管组与浮筒相连接的整体静态力学模型。考虑管组中首管和主管的影响,在重力和浮力载荷的作用下,推导获得了漂浮管组垂向形态及所受弯矩分布函数关系。研究结果表明:作用在管组上的载荷是关于自重、外径以及海水密度的函数;漂浮管组在静态载荷作用下,最大弯矩发生在浮筒和首管接口法兰处,且最大值为52.4 k N·m,最大弯曲主要取决于软管抗弯刚度、管组与浮筒管汇接口的倾斜角;首管相对于主管在竖直平面内发生较大位移,首管的最大位移为1.2 m。计算结果为软管组几何构型的设计提供了一定的理论依据,为其动态性能分析奠定了基础。
文摘The vertical fluxes and vertical transferring forms of 18 rare elements were studied for the first time in the coral reef ecosystem of Nansha Islands, South China Sea, by deploying sediment traps. The results showed that the vertical transferring flux of most of the measured rare elements in Yongshu lagoon were higher than that in Zhubi lagoon. The vertical transferring forms of rare elements were mainly in the carbonate form, but Ta, As, Th mainly in the ion exchange form, Ag in iron manganese oxide form and Sb in the organic matter+sulphide form. None of the 18 rare elements was transferred mainly in the form of detritus silicate to sea floor. This proved that rare elements originating from the earth’s crust were redistributed in sinking particulates after they were brought into ocean. The relation between the fluxes and surface seawater temperature (STT) was also studied. The sensitivity of rare elements to SST was in order: Rb>V>As>Ti>U>Zn>Sb>Hf>Ag>Cs.
文摘The purpose of this study was to identify the availability of authoring tools that support vertical flow function based upon empirical experiments. There were five EPUB authoring tools selected for this study. Four major editing procedures were designed for the project. The first was the support of Chinese character input. The second was vertical form editing. The third was ruby position editing, and finally, testing whether the editing software was capable of outputting a document as an e-Book in EPUB 3.0 format. Five programs were tested, and only one of the five was able to fulfill the aforementioned requirements. The usability of each program is positively verified through this study.
