On September 22, Califor nia multimedia compression technology company DivX successfully conducted its IPO, raising a total of $145.6 million. DivX is one of WI Harper Group ’ s overseas investments. WI Harper is one...On September 22, Califor nia multimedia compression technology company DivX successfully conducted its IPO, raising a total of $145.6 million. DivX is one of WI Harper Group ’ s overseas investments. WI Harper is one of the first U.S .-based hi-tech venture capital firms focused exclusively on creating a bridge between Silicon Valley and the Greater China region . Managing Director of WI Harper David Zhang revealed that on DivX alone, WI Harper made nearly 40 times its orig inal investment . During college,...展开更多
Through investigating colors of Xuzhou City, combining with color planning practices in domestic and foreign cities, current colors and characteristics of main urban districts of Xuzhou City were analyzed, overall ori...Through investigating colors of Xuzhou City, combining with color planning practices in domestic and foreign cities, current colors and characteristics of main urban districts of Xuzhou City were analyzed, overall orientation and design concept of city color were explored, the overall framework of regional building colors and the zoning planning were proposed, to give new concepts for the future city color planning and design.展开更多
The basis, process and results of the demonstration of the main dimensions of a 75000t floating production and storage vessel are discussed in this paper. A simple but reliable orthogonal design method is applied in t...The basis, process and results of the demonstration of the main dimensions of a 75000t floating production and storage vessel are discussed in this paper. A simple but reliable orthogonal design method is applied in the main dimension optimization. The ideas of gradual approximation and feedback from various aspects are put into effect. During the demonstration, in order to make the model tally with the actual situation, the draft design is closely related to the computational analysis, so that the demonstration model can be verified at any time; the handling of the overall system is closely related to the research of each item, which is beneficial not only to the mastery of various regularities, but also to the balance of decisions. Finally, according to the computational results and the regularities obtained from analysis, the main dimensions are determined.展开更多
This contribution describes development and application of a user-friendly finite element program,UT3PC, to address three important problems in underground coal mine design:(1) safety of main entries,(2) barrier pilla...This contribution describes development and application of a user-friendly finite element program,UT3PC, to address three important problems in underground coal mine design:(1) safety of main entries,(2) barrier pillar size needed for entry protection, and(3) safety of bleeder entries during the advance of an adjacent longwall panel.While the finite element method is by far the most popular engineering design tool of the digital age, widespread use by the mining community has been impeded by the relatively high cost of and the need for lengthy specialized training in numerical methods.Implementation of UT3PC overcomes these impediments in three easy steps.First, a material properties file is prepared for the considered site.Next, mesh generation is automatic through an interactive process.A third and last step is simply execution of the program.Examples using data from several western coal mines illustrate the ease of using the application for analysis of main entries, barrier pillars, and bleeder entry safety.展开更多
柔性光学电流互感器(flexible optical current transformer,FOCT)在水电领域的推广应用,为奇数多分支发电机主保护定量化改造奠定了基础。经内部故障的全面分析计算,某每相7分支的大型发电机主保护定量化设计结果推荐采用“3-1-3”分...柔性光学电流互感器(flexible optical current transformer,FOCT)在水电领域的推广应用,为奇数多分支发电机主保护定量化改造奠定了基础。经内部故障的全面分析计算,某每相7分支的大型发电机主保护定量化设计结果推荐采用“3-1-3”分支分组方式,相应的主保护配置方案保护死区虽小(0.5%)但对相间短路存在保护死区——发生在每相未装设分支电流互感器(TA)的第4分支之间,利用柔性光学TA绕制灵活的特点,通过增设每相第4分支的光学TA及对应的不完全纵差保护即可消除上述相间短路保护死区。上述主保护定量化改造思路将为后续奇数多分支大型发电机的技术改造提供借鉴。展开更多
With net zero carbon emissions targets approaching over the next 20 to 30 years, the water industry must act now to develop energy efficient techniques and designs to reduce emissions and reduce the carbon footprint o...With net zero carbon emissions targets approaching over the next 20 to 30 years, the water industry must act now to develop energy efficient techniques and designs to reduce emissions and reduce the carbon footprint of water utility providers. There is also the potential for significant energy and therefore financial savings to be realised from the adoption of more energy efficient designs approaches. Water utility providers account for a significant proportion of national electricity consumption. The purpose of this research is to determine if, over the long term, opting for a larger diameter pipe at design stage can lead to significant financial and emissions savings for water utility providers when considering pumping mains. Pumping mains are widely used throughout the water and wastewater industry where a gravity solution is not possible. 72 hypothetical water main design scenarios were analysed and the long term financial and environmental impact of each hypothetical water main was assessed. It was found across all design scenarios that larger diameter water mains were capable of delivering the same rate of flow of smaller diameter pipes at a much reduced velocity and requiring reduced pumping power. It was concluded that pumped mains of larger diameters can ultimately be more energy efficient and cost effective over the long term when selected in favour of smaller diameter pumped mains in otherwise identical design scenarios.展开更多
文摘On September 22, Califor nia multimedia compression technology company DivX successfully conducted its IPO, raising a total of $145.6 million. DivX is one of WI Harper Group ’ s overseas investments. WI Harper is one of the first U.S .-based hi-tech venture capital firms focused exclusively on creating a bridge between Silicon Valley and the Greater China region . Managing Director of WI Harper David Zhang revealed that on DivX alone, WI Harper made nearly 40 times its orig inal investment . During college,...
文摘Through investigating colors of Xuzhou City, combining with color planning practices in domestic and foreign cities, current colors and characteristics of main urban districts of Xuzhou City were analyzed, overall orientation and design concept of city color were explored, the overall framework of regional building colors and the zoning planning were proposed, to give new concepts for the future city color planning and design.
文摘The basis, process and results of the demonstration of the main dimensions of a 75000t floating production and storage vessel are discussed in this paper. A simple but reliable orthogonal design method is applied in the main dimension optimization. The ideas of gradual approximation and feedback from various aspects are put into effect. During the demonstration, in order to make the model tally with the actual situation, the draft design is closely related to the computational analysis, so that the demonstration model can be verified at any time; the handling of the overall system is closely related to the research of each item, which is beneficial not only to the mastery of various regularities, but also to the balance of decisions. Finally, according to the computational results and the regularities obtained from analysis, the main dimensions are determined.
文摘This contribution describes development and application of a user-friendly finite element program,UT3PC, to address three important problems in underground coal mine design:(1) safety of main entries,(2) barrier pillar size needed for entry protection, and(3) safety of bleeder entries during the advance of an adjacent longwall panel.While the finite element method is by far the most popular engineering design tool of the digital age, widespread use by the mining community has been impeded by the relatively high cost of and the need for lengthy specialized training in numerical methods.Implementation of UT3PC overcomes these impediments in three easy steps.First, a material properties file is prepared for the considered site.Next, mesh generation is automatic through an interactive process.A third and last step is simply execution of the program.Examples using data from several western coal mines illustrate the ease of using the application for analysis of main entries, barrier pillars, and bleeder entry safety.
文摘柔性光学电流互感器(flexible optical current transformer,FOCT)在水电领域的推广应用,为奇数多分支发电机主保护定量化改造奠定了基础。经内部故障的全面分析计算,某每相7分支的大型发电机主保护定量化设计结果推荐采用“3-1-3”分支分组方式,相应的主保护配置方案保护死区虽小(0.5%)但对相间短路存在保护死区——发生在每相未装设分支电流互感器(TA)的第4分支之间,利用柔性光学TA绕制灵活的特点,通过增设每相第4分支的光学TA及对应的不完全纵差保护即可消除上述相间短路保护死区。上述主保护定量化改造思路将为后续奇数多分支大型发电机的技术改造提供借鉴。
文摘With net zero carbon emissions targets approaching over the next 20 to 30 years, the water industry must act now to develop energy efficient techniques and designs to reduce emissions and reduce the carbon footprint of water utility providers. There is also the potential for significant energy and therefore financial savings to be realised from the adoption of more energy efficient designs approaches. Water utility providers account for a significant proportion of national electricity consumption. The purpose of this research is to determine if, over the long term, opting for a larger diameter pipe at design stage can lead to significant financial and emissions savings for water utility providers when considering pumping mains. Pumping mains are widely used throughout the water and wastewater industry where a gravity solution is not possible. 72 hypothetical water main design scenarios were analysed and the long term financial and environmental impact of each hypothetical water main was assessed. It was found across all design scenarios that larger diameter water mains were capable of delivering the same rate of flow of smaller diameter pipes at a much reduced velocity and requiring reduced pumping power. It was concluded that pumped mains of larger diameters can ultimately be more energy efficient and cost effective over the long term when selected in favour of smaller diameter pumped mains in otherwise identical design scenarios.
