The report mainly studied the crawler frame motion platform to reduce weight and increase the intensity. Report described the structural design process which using CAD/CAE technology for solid modeling, simulation ana...The report mainly studied the crawler frame motion platform to reduce weight and increase the intensity. Report described the structural design process which using CAD/CAE technology for solid modeling, simulation analysis, parameter optimization. And it also explained the outstanding advantages of CAD/CAE technology in mechanical design as well as simulation analysis.展开更多
The warehouse environment parameter monitoring system is designed to avoid the networking and high cost of traditional monitoring system.A sensor error correction model which combines particle swarm optimization(PSO)w...The warehouse environment parameter monitoring system is designed to avoid the networking and high cost of traditional monitoring system.A sensor error correction model which combines particle swarm optimization(PSO)with back propagation(BP)neural network algorithm is established to reduce nonlinear characteristics and improve test accuracy of the system.Simulation and experiments indicate that the PSO-BP neural network algorithm has advantages of fast convergence rate and high diagnostic accuracy.The monitoring system can provide higher measurement precision,lower power consume,stable network data communication and fault diagnoses function.The system has been applied to monitoring environment parameter of warehouse,special vehicles and ships,etc.展开更多
Objective: To investigate the correlation between radiation dose and radiation risk when patients are scanned by 64-slice spiral CT. Materials and Methods: SPSS 17.0 is used statistically for analyzing the patient’s ...Objective: To investigate the correlation between radiation dose and radiation risk when patients are scanned by 64-slice spiral CT. Materials and Methods: SPSS 17.0 is used statistically for analyzing the patient’s scanning parameters, radiation dose of monitoring and examining the patients who are scanning of their abdomen, chest and pelvic in our affiliated hospital. Results: SPSS statistical analysis shows that the factor related to radiation dose is scanning layer;the basic characteristics such as height and heart rate don’t affect the patient’s scan dose directly. Conclusion: Increasing the delay time after injection can reduce the scan numbers and monitoring layers of the machine, thus reduce the patient’s radiation dose and tube’s exposure time.展开更多
油气井零散天然气放空不仅浪费能源,还污染环境;现有天然气回收技术较为复杂,投资及运行成本较高,迫切需要一种低成本零散天然气回收技术。提出一种直接压缩拉运回收技术,并从系统设计、创新水合物防控技术论证了其经济可行性。基于全...油气井零散天然气放空不仅浪费能源,还污染环境;现有天然气回收技术较为复杂,投资及运行成本较高,迫切需要一种低成本零散天然气回收技术。提出一种直接压缩拉运回收技术,并从系统设计、创新水合物防控技术论证了其经济可行性。基于全局技术经济优化,确定了不同气量下关键设备的最佳设计参数;创新提出了一种低成本的交替式水合物防控策略,可代替20 kW以上的电加热器或加注3%以上甲醇等常规水合物防控方法;气量为6000 m 3/d时静态回收期仅3年,经济效益较好。针对产气量较低、距处理站较远的油气井提出了直接压缩拉运回收技术,经济可行性优良,具有较高的社会价值。展开更多
文摘The report mainly studied the crawler frame motion platform to reduce weight and increase the intensity. Report described the structural design process which using CAD/CAE technology for solid modeling, simulation analysis, parameter optimization. And it also explained the outstanding advantages of CAD/CAE technology in mechanical design as well as simulation analysis.
文摘The warehouse environment parameter monitoring system is designed to avoid the networking and high cost of traditional monitoring system.A sensor error correction model which combines particle swarm optimization(PSO)with back propagation(BP)neural network algorithm is established to reduce nonlinear characteristics and improve test accuracy of the system.Simulation and experiments indicate that the PSO-BP neural network algorithm has advantages of fast convergence rate and high diagnostic accuracy.The monitoring system can provide higher measurement precision,lower power consume,stable network data communication and fault diagnoses function.The system has been applied to monitoring environment parameter of warehouse,special vehicles and ships,etc.
文摘Objective: To investigate the correlation between radiation dose and radiation risk when patients are scanned by 64-slice spiral CT. Materials and Methods: SPSS 17.0 is used statistically for analyzing the patient’s scanning parameters, radiation dose of monitoring and examining the patients who are scanning of their abdomen, chest and pelvic in our affiliated hospital. Results: SPSS statistical analysis shows that the factor related to radiation dose is scanning layer;the basic characteristics such as height and heart rate don’t affect the patient’s scan dose directly. Conclusion: Increasing the delay time after injection can reduce the scan numbers and monitoring layers of the machine, thus reduce the patient’s radiation dose and tube’s exposure time.
文摘油气井零散天然气放空不仅浪费能源,还污染环境;现有天然气回收技术较为复杂,投资及运行成本较高,迫切需要一种低成本零散天然气回收技术。提出一种直接压缩拉运回收技术,并从系统设计、创新水合物防控技术论证了其经济可行性。基于全局技术经济优化,确定了不同气量下关键设备的最佳设计参数;创新提出了一种低成本的交替式水合物防控策略,可代替20 kW以上的电加热器或加注3%以上甲醇等常规水合物防控方法;气量为6000 m 3/d时静态回收期仅3年,经济效益较好。针对产气量较低、距处理站较远的油气井提出了直接压缩拉运回收技术,经济可行性优良,具有较高的社会价值。
