When shovels load the dump trucks with over 100-ton passes under gravity dumping conditions, they will create a large impact force on the dump truck body which generates high frequency shock waves which expose the ope...When shovels load the dump trucks with over 100-ton passes under gravity dumping conditions, they will create a large impact force on the dump truck body which generates high frequency shock waves which expose the operators to whole body vibrations （WBV）. The main cause of such truck vibrations is the large impact force due to the gravity dumping of large tonnage passes. Therefore a rigorous mathematical model has been developed for the impact force containing all the necessary factors upon which it depends. Latter, a thorough analysis shows that percentage reduction of 7.19%, 9.40%, 13.27%, 14.8%, 17.30% and 18.13% can he achieved by reducing the dumping distance to 6.33 m, 6.0 m, 5.5 m, 5.33 m, 5.0 m and 4.9 m, respectively, as compared to when the dumping distance was 7.33 m. Even more reduction in the magnitude of impact force can he observed if the shovel pass gets divided into more than two sub-passes. Therefore, these models can he used to figure out the number of sub-passes into which a single ore pass can he divided and/or the extent to which the dumping distance can he reduced which would reduce the impact force significantly enough to obtain safer yet economic operations.展开更多
提出一套集成式低倍聚光光伏组件光路的优化算法,并设计制作聚光比为2.2的晶体硅聚光电池模块,在标准光照条件(AM1.5)下,开路电压为0.69 V,短路电流密度为35 m A/cm^2,最大功率点效率约为14.2%。与使用相同电池材料制作的普通晶体硅模...提出一套集成式低倍聚光光伏组件光路的优化算法,并设计制作聚光比为2.2的晶体硅聚光电池模块,在标准光照条件(AM1.5)下,开路电压为0.69 V,短路电流密度为35 m A/cm^2,最大功率点效率约为14.2%。与使用相同电池材料制作的普通晶体硅模块相比,效率可提高0.7%。相比普通晶体硅组件,该型组件可节约50%~60%的电池材料使用量。展开更多
提出一种适合心电信号(ECG)检测的OTA-C滤波器。为了达到低功耗、低截止频率、高直流增益、高阻带衰减、低谐波失真的目的,滤波器采用五阶巴特沃斯全差分低通滤波结构和高增益的两级单端输出OTA,其中OTA电路采用亚阈值区驱动、电流分流...提出一种适合心电信号(ECG)检测的OTA-C滤波器。为了达到低功耗、低截止频率、高直流增益、高阻带衰减、低谐波失真的目的,滤波器采用五阶巴特沃斯全差分低通滤波结构和高增益的两级单端输出OTA,其中OTA电路采用亚阈值区驱动、电流分流和源极负反馈等技术。采用SMIC 0.18-μm 1P6M CMOS工艺进行电路、版图设计及优化。仿真结果表明,滤波器在静态功耗为17.6μW,截止频率为240 Hz,直流增益为-6 d B,阻带衰减大于72 d B每五倍频,三次谐波失真小于-62 d B在400 m V时,适合应用于心电信号检测模拟前端。展开更多
文摘When shovels load the dump trucks with over 100-ton passes under gravity dumping conditions, they will create a large impact force on the dump truck body which generates high frequency shock waves which expose the operators to whole body vibrations （WBV）. The main cause of such truck vibrations is the large impact force due to the gravity dumping of large tonnage passes. Therefore a rigorous mathematical model has been developed for the impact force containing all the necessary factors upon which it depends. Latter, a thorough analysis shows that percentage reduction of 7.19%, 9.40%, 13.27%, 14.8%, 17.30% and 18.13% can he achieved by reducing the dumping distance to 6.33 m, 6.0 m, 5.5 m, 5.33 m, 5.0 m and 4.9 m, respectively, as compared to when the dumping distance was 7.33 m. Even more reduction in the magnitude of impact force can he observed if the shovel pass gets divided into more than two sub-passes. Therefore, these models can he used to figure out the number of sub-passes into which a single ore pass can he divided and/or the extent to which the dumping distance can he reduced which would reduce the impact force significantly enough to obtain safer yet economic operations.
文摘提出一套集成式低倍聚光光伏组件光路的优化算法,并设计制作聚光比为2.2的晶体硅聚光电池模块,在标准光照条件(AM1.5)下,开路电压为0.69 V,短路电流密度为35 m A/cm^2,最大功率点效率约为14.2%。与使用相同电池材料制作的普通晶体硅模块相比,效率可提高0.7%。相比普通晶体硅组件,该型组件可节约50%~60%的电池材料使用量。
文摘提出一种适合心电信号(ECG)检测的OTA-C滤波器。为了达到低功耗、低截止频率、高直流增益、高阻带衰减、低谐波失真的目的,滤波器采用五阶巴特沃斯全差分低通滤波结构和高增益的两级单端输出OTA,其中OTA电路采用亚阈值区驱动、电流分流和源极负反馈等技术。采用SMIC 0.18-μm 1P6M CMOS工艺进行电路、版图设计及优化。仿真结果表明,滤波器在静态功耗为17.6μW,截止频率为240 Hz,直流增益为-6 d B,阻带衰减大于72 d B每五倍频,三次谐波失真小于-62 d B在400 m V时,适合应用于心电信号检测模拟前端。
