Objective To investigate the changing regularity of thoracic pedicle screw channel (PSC) in different transverse screw angle(TSA).Methods CT scan images of thoracic vertebrae of a healthy adult ware digitally analyzed...Objective To investigate the changing regularity of thoracic pedicle screw channel (PSC) in different transverse screw angle(TSA).Methods CT scan images of thoracic vertebrae of a healthy adult ware digitally analyzed by Mimics 10.01展开更多
Objective To explore the differences between anatomic and CT measurements for anterior transoral axial pedicle screw placement. Methods C2 vertebrae of 60 adult spines were measured anatomically,while 20 adult spine v...Objective To explore the differences between anatomic and CT measurements for anterior transoral axial pedicle screw placement. Methods C2 vertebrae of 60 adult spines were measured anatomically,while 20 adult spine vertebrae were展开更多
Renewable energy technologies,particularly in electric vehicles(EVs),have received significant attention in re-cent years.The wasted energy in a vehicle’s shock absorber can be converted into an alternative energy so...Renewable energy technologies,particularly in electric vehicles(EVs),have received significant attention in re-cent years.The wasted energy in a vehicle’s shock absorber can be converted into an alternative energy source by regenerative shock absorbers.In this paper,a high-efficiency regenerative shock absorber considering twin ball screws transmissions is proposed for application in range-extended electric vehicles.The proposed regenerative shock absorber can convert vibrational kinetic energy,which is traditionally dissipated as heat in suspension systems,into electricity.The proposed system is divided into four modules:suspension vibration input module,transmission module,generator module and power storage module.Induced by road roughness,the irregular linear oscillations of the suspension are transmitted to the suspension vibration input module.The reciprocating vibrations are converted into unidirectional rotation of the generator by a pair of ball screws,gears,and two overrun clutches in the transmission module.The utilisation of different screw pitches leads to different damping coefficients for upward and downward progress,enabling the shock absorber to fully utilise elastic elements to im-prove vehicle comfort when compressed and quickly absorb vibrations when stretched.The electricity produced by the generator is stored in supercapacitors to charge the battery and extend the range of EVs.The mechanical properties of the full-scaled fabricated prototype were studied by utilising a mechanical testing and sensing fix-ture.An average power output of 3.701 W in 1Hz-3 mm sinusoidal vibration input and a peak efficiency of 51.1%and average efficiency of 36.4%were achieved in a bench tests.The range can be approximately extended by 1 mile per 100 miles when EV is driving on the road of class B with a speed of 60 km/h,demonstrating that the proposed high-efficiency regenerative shock absorber is beneficial for harvesting renewable energy,and practical and significant for extending the range of EVs.展开更多
文摘Objective To investigate the changing regularity of thoracic pedicle screw channel (PSC) in different transverse screw angle(TSA).Methods CT scan images of thoracic vertebrae of a healthy adult ware digitally analyzed by Mimics 10.01
文摘Objective To explore the differences between anatomic and CT measurements for anterior transoral axial pedicle screw placement. Methods C2 vertebrae of 60 adult spines were measured anatomically,while 20 adult spine vertebrae were
基金This work was supported by the National Natural Science Foundation of China under Grant Nos.51675451 and 51975490Science and Tech-nology Projects of Sichuan and Chengdu under Grant Nos.2016GZ0026,2016CC0027,2017RZ0056,and 18MZGC0272.
文摘Renewable energy technologies,particularly in electric vehicles(EVs),have received significant attention in re-cent years.The wasted energy in a vehicle’s shock absorber can be converted into an alternative energy source by regenerative shock absorbers.In this paper,a high-efficiency regenerative shock absorber considering twin ball screws transmissions is proposed for application in range-extended electric vehicles.The proposed regenerative shock absorber can convert vibrational kinetic energy,which is traditionally dissipated as heat in suspension systems,into electricity.The proposed system is divided into four modules:suspension vibration input module,transmission module,generator module and power storage module.Induced by road roughness,the irregular linear oscillations of the suspension are transmitted to the suspension vibration input module.The reciprocating vibrations are converted into unidirectional rotation of the generator by a pair of ball screws,gears,and two overrun clutches in the transmission module.The utilisation of different screw pitches leads to different damping coefficients for upward and downward progress,enabling the shock absorber to fully utilise elastic elements to im-prove vehicle comfort when compressed and quickly absorb vibrations when stretched.The electricity produced by the generator is stored in supercapacitors to charge the battery and extend the range of EVs.The mechanical properties of the full-scaled fabricated prototype were studied by utilising a mechanical testing and sensing fix-ture.An average power output of 3.701 W in 1Hz-3 mm sinusoidal vibration input and a peak efficiency of 51.1%and average efficiency of 36.4%were achieved in a bench tests.The range can be approximately extended by 1 mile per 100 miles when EV is driving on the road of class B with a speed of 60 km/h,demonstrating that the proposed high-efficiency regenerative shock absorber is beneficial for harvesting renewable energy,and practical and significant for extending the range of EVs.
