For decades,China's extensive network of highways has largely remained toll-free However,local governments are pushing harder than ever before for tolls to heln cover costs and pull them out of debt.
The race is on to develop a new generation of solid-state batteries,which are safer and more energy efficient than liquid lithium-ion batteries.At stake is the total structure of the electric vehicle,along with other ...The race is on to develop a new generation of solid-state batteries,which are safer and more energy efficient than liquid lithium-ion batteries.At stake is the total structure of the electric vehicle,along with other industries。展开更多
Piezoelectric robots play important roles in the field of micromanipulation, but it is difficult for them to generate steady precision motion at any moment. In order to eliminate the changing inertial force and improv...Piezoelectric robots play important roles in the field of micromanipulation, but it is difficult for them to generate steady precision motion at any moment. In order to eliminate the changing inertial force and improve the motion smoothness, this work proposes a piezoelectric robot with continuous walking gait inspired by ants. The idea is verified with theoretical models and numerical simulation, and the performances are evaluated with experiments. The robot is proven to have the ability to generate 3-DOF(dgeree of freedom) continuous smooth motions with constant speeds. The maximum and minimum smooth velocities have a difference of six orders of magnitude, realizing cross-scale velocity control. Besides, the motion resolution reaches several nanometers with the unlimited workspace, so the cross-scale displacement control can be also obtained. Furthermore, with great robustness against varying loads, the stable actuation capability of the robot is more than 22 times of the self-weight. To sum up,the proposed robot generates cross-scale smooth motion in both aspects of displacement and velocity, so it has good prospects in the applications requiring steady precision motion. The design philosophy and research methods in this work can be valuable references for further advances of micromanipulation robots.展开更多
Chen Wei,a general manager at Shanghai-based Jumbo Consuling,says there is a Inew enthusiasm to invest in pumped-storage hydropower(PSH)stations,buoyed by government pronouncements of support in the past two years.&qu...Chen Wei,a general manager at Shanghai-based Jumbo Consuling,says there is a Inew enthusiasm to invest in pumped-storage hydropower(PSH)stations,buoyed by government pronouncements of support in the past two years."PSH is one of the few effective investment options recognized by the market,although infrastructure investment is warming up overall,"Chen said.展开更多
Aluminum producers,lured to southwest China on the promise of cheap and abundant hydropower,are reassessing investments in the region as a prolonged drought hits electricity supplies.
After China loosened Covid restrictions,city and provincial delegations rushed abroad to attract foreign investors in the hopes of easing post-pandemic uncertainties.
文摘For decades,China's extensive network of highways has largely remained toll-free However,local governments are pushing harder than ever before for tolls to heln cover costs and pull them out of debt.
文摘The race is on to develop a new generation of solid-state batteries,which are safer and more energy efficient than liquid lithium-ion batteries.At stake is the total structure of the electric vehicle,along with other industries。
基金supported by the National Natural Science Foundation of China (Grant Nos. U1913215 and 51975144)。
文摘Piezoelectric robots play important roles in the field of micromanipulation, but it is difficult for them to generate steady precision motion at any moment. In order to eliminate the changing inertial force and improve the motion smoothness, this work proposes a piezoelectric robot with continuous walking gait inspired by ants. The idea is verified with theoretical models and numerical simulation, and the performances are evaluated with experiments. The robot is proven to have the ability to generate 3-DOF(dgeree of freedom) continuous smooth motions with constant speeds. The maximum and minimum smooth velocities have a difference of six orders of magnitude, realizing cross-scale velocity control. Besides, the motion resolution reaches several nanometers with the unlimited workspace, so the cross-scale displacement control can be also obtained. Furthermore, with great robustness against varying loads, the stable actuation capability of the robot is more than 22 times of the self-weight. To sum up,the proposed robot generates cross-scale smooth motion in both aspects of displacement and velocity, so it has good prospects in the applications requiring steady precision motion. The design philosophy and research methods in this work can be valuable references for further advances of micromanipulation robots.
文摘Chen Wei,a general manager at Shanghai-based Jumbo Consuling,says there is a Inew enthusiasm to invest in pumped-storage hydropower(PSH)stations,buoyed by government pronouncements of support in the past two years."PSH is one of the few effective investment options recognized by the market,although infrastructure investment is warming up overall,"Chen said.
文摘Aluminum producers,lured to southwest China on the promise of cheap and abundant hydropower,are reassessing investments in the region as a prolonged drought hits electricity supplies.
文摘After China loosened Covid restrictions,city and provincial delegations rushed abroad to attract foreign investors in the hopes of easing post-pandemic uncertainties.
