5033 farmers were interviewed to participate in a cluster sampling survey on factors related to the HIV/AIDS epidemic in one rural area in China. The results showed that females attended school for a shorter time than...5033 farmers were interviewed to participate in a cluster sampling survey on factors related to the HIV/AIDS epidemic in one rural area in China. The results showed that females attended school for a shorter time than males, males had a higher awareness of HIV/AIDS and held more positive attitudes toward PLWHAs. Nearly equal percentages of men and women in the area surveyed, sold blood. Eleven percent more men than women had a history of migration. Condom use was quite low among the sexually active population surveyed. Results indicated that an education campaign on HIV/AIDS prevention in rural areas should integrate gender perspectives and ensure that the intervention covers women. Future interventions should be designed to target male and female migration, and should focus on modifying the perceptions of social norms governing gender roles in addition to providing HIV prevention information in order to contain the HIV/AIDS epidemic at its current stage in China.展开更多
This paper aims to reflect upon the approximations between literature and history in Pat Barker＇s novel Regeneration （1991）. The novel fictionalizes the conversations held by three war veterans who wrote and fought...This paper aims to reflect upon the approximations between literature and history in Pat Barker＇s novel Regeneration （1991）. The novel fictionalizes the conversations held by three war veterans who wrote and fought in the First World War （Wilfred Owen, Siegfried Sassoon, and Robert Graves） during their stay at Craiglockart＇s Hospital--a war hospital for the treatment of shell-shocked officers, in Scotland. The paper addresses more emphatically how traditional male and female roles are renegotiated in Barker＇s metafiction. Finally, it provides some considerations on British women war writing of the First World War, a tradition in which Regeneration is rooted and emerges as a remarkable contemporary example.展开更多
To improve maneuverability and stability of articulated vehicles, we design an active steering controller, including tractor and trailer controllers, based on linear quadratic regulator(LQR) theory. First, a three-deg...To improve maneuverability and stability of articulated vehicles, we design an active steering controller, including tractor and trailer controllers, based on linear quadratic regulator(LQR) theory. First, a three-degree-of-freedom(3-DOF) model of the tractor-trailer with steered trailer axles is built. The simulated annealing particle swarm optimization(SAPSO) algorithm is applied to identify the key parameters of the model under specified vehicle speed and steering wheel angle. Thus, the key parameters of the simplified model can be obtained according to the vehicle conditions using an online look-up table and interpolation. Simulation results show that vehicle parameter outputs of the simplified model and Truck Sim agree well, thus providing the ideal reference yaw rate for the controller. Then the active steering controller of the tractor and trailer based on LQR is designed to follow the desired yaw rate and minimize their side-slip angle of the center of gravity(CG) at the same time. Finally, simulation tests at both low speed and high speed are conducted based on the Truck Sim-Simulink program. The results show significant effects on the active steering controller on improving maneuverability at low speed and lateral stability at high speed for the articulated vehicle. The control strategy is applicable for steering not only along gentle curves but also along sharp curves.展开更多
文摘5033 farmers were interviewed to participate in a cluster sampling survey on factors related to the HIV/AIDS epidemic in one rural area in China. The results showed that females attended school for a shorter time than males, males had a higher awareness of HIV/AIDS and held more positive attitudes toward PLWHAs. Nearly equal percentages of men and women in the area surveyed, sold blood. Eleven percent more men than women had a history of migration. Condom use was quite low among the sexually active population surveyed. Results indicated that an education campaign on HIV/AIDS prevention in rural areas should integrate gender perspectives and ensure that the intervention covers women. Future interventions should be designed to target male and female migration, and should focus on modifying the perceptions of social norms governing gender roles in addition to providing HIV prevention information in order to contain the HIV/AIDS epidemic at its current stage in China.
文摘This paper aims to reflect upon the approximations between literature and history in Pat Barker＇s novel Regeneration （1991）. The novel fictionalizes the conversations held by three war veterans who wrote and fought in the First World War （Wilfred Owen, Siegfried Sassoon, and Robert Graves） during their stay at Craiglockart＇s Hospital--a war hospital for the treatment of shell-shocked officers, in Scotland. The paper addresses more emphatically how traditional male and female roles are renegotiated in Barker＇s metafiction. Finally, it provides some considerations on British women war writing of the First World War, a tradition in which Regeneration is rooted and emerges as a remarkable contemporary example.
基金supported by the Program for Changjiang ScholarsInnovative Research Team in University,China(No.IRT0626)
文摘To improve maneuverability and stability of articulated vehicles, we design an active steering controller, including tractor and trailer controllers, based on linear quadratic regulator(LQR) theory. First, a three-degree-of-freedom(3-DOF) model of the tractor-trailer with steered trailer axles is built. The simulated annealing particle swarm optimization(SAPSO) algorithm is applied to identify the key parameters of the model under specified vehicle speed and steering wheel angle. Thus, the key parameters of the simplified model can be obtained according to the vehicle conditions using an online look-up table and interpolation. Simulation results show that vehicle parameter outputs of the simplified model and Truck Sim agree well, thus providing the ideal reference yaw rate for the controller. Then the active steering controller of the tractor and trailer based on LQR is designed to follow the desired yaw rate and minimize their side-slip angle of the center of gravity(CG) at the same time. Finally, simulation tests at both low speed and high speed are conducted based on the Truck Sim-Simulink program. The results show significant effects on the active steering controller on improving maneuverability at low speed and lateral stability at high speed for the articulated vehicle. The control strategy is applicable for steering not only along gentle curves but also along sharp curves.
