An incompressible flow in a porous channel with expanding or contacting walls in the presence of a transverse magnetic field is considered. Using similarity transformations, the governing equations are reduced to the ...An incompressible flow in a porous channel with expanding or contacting walls in the presence of a transverse magnetic field is considered. Using similarity transformations, the governing equations are reduced to the nonlinear ordinary differential equations. The exact similar solutions for the different cases of the expansion ratio and the Hartmann number are obtained with a singular perturbation method, and the associated behavior is discussed in detail.展开更多
The positively charged single walled carbon nanotubes （SWNTs^＋） were prepared by conjugating with -CONH-C6H12-NH3^＋. The double strand DNA （dsDNA） chains were loaded onto SWNTs^＋ via the electrostatic interacti...The positively charged single walled carbon nanotubes （SWNTs^＋） were prepared by conjugating with -CONH-C6H12-NH3^＋. The double strand DNA （dsDNA） chains were loaded onto SWNTs^＋ via the electrostatic interactions. SWNTs^＋ shows improved loading efficiency （353.5 μg/mg） toward dsDNA compared with that of charged free single walled carbon nanotubes （SWNTs） （82.9 μg/mg）.展开更多
The development of sustainability has made the application of green concepts to cityscapes and urban design mandatory and has popularized the installation of vegetation on external street walls. Introducing greenery o...The development of sustainability has made the application of green concepts to cityscapes and urban design mandatory and has popularized the installation of vegetation on external street walls. Introducing greenery on external building elements is beneficial to the environment, reducing the heat impact experienced in ＂urban heat islands＂ and enhancing an area＇s visual effect. The popularity of such green systems has necessitated the assessment of their acoustic characteristics and their impact on long-distance noise propagation. These effects become important in hot climates, where the topology of the dense urban texture gives building walls larger areas than exposed streets, thereby amplifying the effects of the former＇s acoustic characteristics on noise levels. Considering the resultant sound level at a particular location between buildings as the contribution of several remote sources, a simplified computer model based on energy exchange is developed in this study. Owing to the complexity of the urban landscape, buildings are assumed to be an array of rectangular blocks. The computer model is used to investigate the effects of the installation of street vertical ve^letation on long-distance noise propagation, as well as those of the geometric parameters of the dense Islamic urban texture on the resultant noise levels.展开更多
The aim of this essay is to analyze the first story by Zhang Xiaofeng, Taiwan writer, playwright, known in the mainland of China mainly as an excellent essayist. The Wailing Wall （Kuqiang） was written in 1968 in the...The aim of this essay is to analyze the first story by Zhang Xiaofeng, Taiwan writer, playwright, known in the mainland of China mainly as an excellent essayist. The Wailing Wall （Kuqiang） was written in 1968 in the atmosphere of the Six Days War in Israel, the atrocities during the first years of the Cultural Revolution in the mainland of China, and war in Vietnam, Wailing Wall is a poetic symbol of sadness and suffering mostly of the innocent people. For the author of the story it is reminiscent of the biblical Psalm 137 depicting the moods of the Hebrews in the Babylonian Captivity after 586 B.C. and the situation of her compatriots who were forced to leave their old homes in the Mainland before Oct. 1, 1949. Zhang Xiaofeng is a Christian author regarding love as the cornerstone of inter-human relations. She believes in love of God for all human beings and in the universal love. The short story consisting of one woman and her relations with two brothers between October 1949 and June 1967, against the background what happened in the world around them, and in their vicinity, brought her an unpleasant cognition： The true love is hardly possible where the human beings should live between, or behind the walls, where hate is prevailing.展开更多
文摘An incompressible flow in a porous channel with expanding or contacting walls in the presence of a transverse magnetic field is considered. Using similarity transformations, the governing equations are reduced to the nonlinear ordinary differential equations. The exact similar solutions for the different cases of the expansion ratio and the Hartmann number are obtained with a singular perturbation method, and the associated behavior is discussed in detail.
文摘The positively charged single walled carbon nanotubes （SWNTs^＋） were prepared by conjugating with -CONH-C6H12-NH3^＋. The double strand DNA （dsDNA） chains were loaded onto SWNTs^＋ via the electrostatic interactions. SWNTs^＋ shows improved loading efficiency （353.5 μg/mg） toward dsDNA compared with that of charged free single walled carbon nanotubes （SWNTs） （82.9 μg/mg）.
文摘The development of sustainability has made the application of green concepts to cityscapes and urban design mandatory and has popularized the installation of vegetation on external street walls. Introducing greenery on external building elements is beneficial to the environment, reducing the heat impact experienced in ＂urban heat islands＂ and enhancing an area＇s visual effect. The popularity of such green systems has necessitated the assessment of their acoustic characteristics and their impact on long-distance noise propagation. These effects become important in hot climates, where the topology of the dense urban texture gives building walls larger areas than exposed streets, thereby amplifying the effects of the former＇s acoustic characteristics on noise levels. Considering the resultant sound level at a particular location between buildings as the contribution of several remote sources, a simplified computer model based on energy exchange is developed in this study. Owing to the complexity of the urban landscape, buildings are assumed to be an array of rectangular blocks. The computer model is used to investigate the effects of the installation of street vertical ve^letation on long-distance noise propagation, as well as those of the geometric parameters of the dense Islamic urban texture on the resultant noise levels.
文摘The aim of this essay is to analyze the first story by Zhang Xiaofeng, Taiwan writer, playwright, known in the mainland of China mainly as an excellent essayist. The Wailing Wall （Kuqiang） was written in 1968 in the atmosphere of the Six Days War in Israel, the atrocities during the first years of the Cultural Revolution in the mainland of China, and war in Vietnam, Wailing Wall is a poetic symbol of sadness and suffering mostly of the innocent people. For the author of the story it is reminiscent of the biblical Psalm 137 depicting the moods of the Hebrews in the Babylonian Captivity after 586 B.C. and the situation of her compatriots who were forced to leave their old homes in the Mainland before Oct. 1, 1949. Zhang Xiaofeng is a Christian author regarding love as the cornerstone of inter-human relations. She believes in love of God for all human beings and in the universal love. The short story consisting of one woman and her relations with two brothers between October 1949 and June 1967, against the background what happened in the world around them, and in their vicinity, brought her an unpleasant cognition： The true love is hardly possible where the human beings should live between, or behind the walls, where hate is prevailing.
