It is believed that human ancestors evolved the ability to run bipedally approximately 2 million years ago. This form of locomotion may have been important to our survival and likely has influenced the evolution of ou...It is believed that human ancestors evolved the ability to run bipedally approximately 2 million years ago. This form of locomotion may have been important to our survival and likely has influenced the evolution of our body form. As our bodies have adapted to run, it seems unusual that up to 79% of modern day runners are injured annually. The etiology of these injuries is clearly multifactorial. However, 1 aspect of running that has significantly changed over the past 50 years is the footwear we use. Modern running shoes have become increasingly cushioned and supportive, and have changed the way we run. In particular, they have altered our footstrike pattern from a predominantly forefoot strike(FFS) landing to a predominantly rearfoot strike(RFS) landing. This change alters the way in which the body is loaded and may be contributing to the high rate of injuries runners experience while engaged in an activity for which they were adapted. In this paper, we will examine the benefits of barefoot running(typically an FFS pattern),and compare the lower extremity mechanics between FFS and RFS. The implications of these mechanical differences, in terms of injury, will be discussed. We will then provide evidence to support our contention that FFS provides an optimal mechanical environment for specific foot and ankle structures, such as the heel pad, the plantar fascia, and the Achilles tendon. The importance of footwear will then be addressed, highlighting its interaction with strike pattern on mechanics. This analysis will underscore why footwear matters when assessing mechanics. Finally, proper preparation and safe transition to an FFS pattern in minimal shoes will be emphasized. Through the discussion of the current literature, we will develop a justification for returning to running in the way for which we were adapted to reduce running-related injuries.展开更多
THE rapid growth of China＇s international trade has had a dramatic impact on its economy. Chi- na has grown in a short time to become the second largest economy in the world, In order to match its economy with the in...THE rapid growth of China＇s international trade has had a dramatic impact on its economy. Chi- na has grown in a short time to become the second largest economy in the world, In order to match its economy with the international use of its currency - the renminbi （RMB） - China has begun the process of RMB internationalization from the pilot cross-border RMB settlement scheme and capital account opening several years ago to facilitating and encouraging the use of the RMB outside the Chinese mainland.展开更多
In 2018-2019,two types of rocket-triggered lightning tests,that is,striking to ground and distribution line,were conducted in Guangdong,China.The main focus of this paper is to compare the waveform parameters of the r...In 2018-2019,two types of rocket-triggered lightning tests,that is,striking to ground and distribution line,were conducted in Guangdong,China.The main focus of this paper is to compare the waveform parameters of the return strokes(RS)from the two tests.For current,the 10%-90%risetime of RS from lightning striking to distribution line is 2.4 times higher than that striking to ground,and the differences in the other parameters are small.For close magnetic field,the RS from lightning striking to distribution line have a lower peak(30%lower after considering the peak current)and a larger risetime and half-peak width time;besides,it is necessary to divide the front edge of the close magnetic field waveform into two parts:leader(BL)and return stroke(BRS).For close electric field,the close RS electric field peak(ERS)was less sensitive to distance than the leader electric field peak(EL).For far electric field,the differences in waveform parameters of RS from the two tests were not significant,but after considering the peak current,the normalised initial electric field peak(EP)of RS from lightning striking to distribution line was 14%lower than that striking to ground.展开更多
In the summer of 2018–2019,rocket-triggered lightning experiments were conducted in Guangzhou,China.There were two types of lightning targets:ground and overhead line.By comparing the current and the electric field d...In the summer of 2018–2019,rocket-triggered lightning experiments were conducted in Guangzhou,China.There were two types of lightning targets:ground and overhead line.By comparing the current and the electric field data in the two cases,it was found that when the continuous current level(ICC)and current amplitude(IM)of M-components(current pulses generated during the continuous current stage)are large,the time difference between the electric field peak and the current peak(TD)will always be small.The rise time(RT)and half peak width(THPW)of M-components with high ICC and IM are low in both the cases.The threshold upper limit of TD in the case of lightning striking the ground is higher,approxi-mately 2.6 times than that in the case of lightning striking the overhead line.We use an optimised guided wave model to simulate the electric field waveforms of M-components.It was found that the shorter RT and THPW of the M-component,the smaller TD.The changes in wave speed and IM cannot affect the size of TD,and the impact of distance changes is very weak.The difference in the threshold upper limit of TD may be related to the significant difference in ground impedance in two cases.展开更多
The recent Strategic Economic Dialogue between China and the United States achieves some results but more talks are apparently needed to iron out fundamental differences Top Chinese and U.S. economic officials may jus...The recent Strategic Economic Dialogue between China and the United States achieves some results but more talks are apparently needed to iron out fundamental differences Top Chinese and U.S. economic officials may justi- fiably take some pride in their展开更多
National parks give life to ancient heritagesites in cities On these thriving spring days,China’s he ritage site protection is also embracing a new spring.This golden period began last October,when the
Collective bargaining on wage at a Honda factory has set a precedent with potential ramifications for the whole economy After months of negotiations, workers at Honda Auto Parts Manufacturing Co. in Foshan City, south...Collective bargaining on wage at a Honda factory has set a precedent with potential ramifications for the whole economy After months of negotiations, workers at Honda Auto Parts Manufacturing Co. in Foshan City, south China’s Guangdong Province, secured an increase of 611 yuan ($96), or 32 percent, to their monthly pay on June 25.展开更多
A half-decade gap between albums may be the norm for veteran rock stars holding on to what*s left of their music career.When it's a young band with massive potential and a solid fan-base,it's not so com-mon.&q...A half-decade gap between albums may be the norm for veteran rock stars holding on to what*s left of their music career.When it's a young band with massive potential and a solid fan-base,it's not so com-mon."We've been through a lot,both in and out of music,"explains Wang Xinjiu and He Fan,the founding members of Beijing noise rock outfit Birdstriking.展开更多
A half-decade gap between albums may be the norm for veteran rock stars holding on to what's left of their music career:When it's a young band with massive potential and a solid fan-base,it's not so common...A half-decade gap between albums may be the norm for veteran rock stars holding on to what's left of their music career:When it's a young band with massive potential and a solid fan-base,it's not so common."We've been through a lot,both in and out of music,"explains Wang Xinjju and He Fan,the founding members of Beijing noise rock outfit Birdstriking.展开更多
The first Sunbeam Amateur PianoContest was held in the BeijingYouth Palace.More than 400people signed up and 130 of them wereselected to perform on stage.Theyoungest was 45 years old and the oldestwas 80.Most came fro...The first Sunbeam Amateur PianoContest was held in the BeijingYouth Palace.More than 400people signed up and 130 of them wereselected to perform on stage.Theyoungest was 45 years old and the oldestwas 80.Most came from the BeijingTraining Class for Middle-aged andElderly People but some came from asfar away as Liaoning and Hubei.展开更多
In 1891,a New York surgeon named William Coley injected cancer patients with live bacteria,observing with fascination as some tumors shrank amid raging fevers.His crude experiments-later deemed reckless-nonetheless re...In 1891,a New York surgeon named William Coley injected cancer patients with live bacteria,observing with fascination as some tumors shrank amid raging fevers.His crude experiments-later deemed reckless-nonetheless revealed a tantalizing truth:The immune system,when properly provoked,could attack cancer.Over a century later,researchers have transformed this observation into a precision strike force.展开更多
Drone swarm systems,equipped with photoelectric imaging and intelligent target perception,are essential for reconnaissance and strike missions in complex and high-risk environments.They excel in information sharing,an...Drone swarm systems,equipped with photoelectric imaging and intelligent target perception,are essential for reconnaissance and strike missions in complex and high-risk environments.They excel in information sharing,anti-jamming capabilities,and combat performance,making them critical for future warfare.However,varied perspectives in collaborative combat scenarios pose challenges to object detection,hindering traditional detection algorithms and reducing accuracy.Limited angle-prior data and sparse samples further complicate detection.This paper presents the Multi-View Collaborative Detection System,which tackles the challenges of multi-view object detection in collaborative combat scenarios.The system is designed to enhance multi-view image generation and detection algorithms,thereby improving the accuracy and efficiency of object detection across varying perspectives.First,an observation model for three-dimensional targets through line-of-sight angle transformation is constructed,and a multi-view image generation algorithm based on the Pix2Pix network is designed.For object detection,YOLOX is utilized,and a deep feature extraction network,BA-RepCSPDarknet,is developed to address challenges related to small target scale and feature extraction challenges.Additionally,a feature fusion network NS-PAFPN is developed to mitigate the issue of deep feature map information loss in UAV images.A visual attention module(BAM)is employed to manage appearance differences under varying angles,while a feature mapping module(DFM)prevents fine-grained feature loss.These advancements lead to the development of BA-YOLOX,a multi-view object detection network model suitable for drone platforms,enhancing accuracy and effectively targeting small objects.展开更多
In the past,the lightning strike risk assessment of wind farms mainly referred to the Lightning Protection Part 2:Risk Management(IEC 62305-2-2010)and the Lightning Protection of Wind Energy System(IEC 61400-24-2019)b...In the past,the lightning strike risk assessment of wind farms mainly referred to the Lightning Protection Part 2:Risk Management(IEC 62305-2-2010)and the Lightning Protection of Wind Energy System(IEC 61400-24-2019)based on protection angle method.In fact,the basic idea of the two is the same,that is,the source of the lightning fan is replaced by S1-S4 of the former lightning building with the latter ND-NDJ.According to the above method of wind farm evaluation,it has been proved that the practice can not achieve good results.Taking offshore wind farm as an example,this paper introduces a new method of establishing six evaluation indicators to determine the risk level according to the new technology and compliance principle of regional lightning protection(semi-circular method),which can be used for reference by wind farm technicians.展开更多
Objective: To observe the risk factors of thrombosis in patients with obstructive sleep apnea hypopnea syndrome (OSAHS).Methods: From February 2001 to April 2003, 24 patients with moderate and severe OSAHS (OSAHS grou...Objective: To observe the risk factors of thrombosis in patients with obstructive sleep apnea hypopnea syndrome (OSAHS).Methods: From February 2001 to April 2003, 24 patients with moderate and severe OSAHS (OSAHS group) and 19 healthy adults (control group) were recruited. Their blood samples were drawn at 6∶00 and 16∶00 respectively for testing hemocrit, platelet aggregation (PAG), whole blood viscosity (WBV), prothrombin time (PT), activated partial thromboplastin time (APTT), plasma fibrinogen (Fng) and endothelin (ET).Results: There was a significantly higher hemocrit, WBV, Fng and ET as well as a significant shortening of PT and APTT at 6∶00 than that at 16∶00 in OSAHS group. However, there was no significant difference in all testing items between 6∶00 and 16∶00 in control group. The hemocrit, WBV, PAG, plasma Fng and ET were significantly higher, and PT and APTT were obviously shorter at 6∶00 in OSAHS group than those at 6∶00 in control group. A higher hemocrit, PAG, plasma Fng and ET, a longer PT and APTT were observed at 16∶00 in OSAHS group, compared with those at 16∶00 in control group.Conclusion: In OSAHS patients there were striking risk factors of thrombosis, which is more remarkable in the early morning than in the afternoon.展开更多
文摘It is believed that human ancestors evolved the ability to run bipedally approximately 2 million years ago. This form of locomotion may have been important to our survival and likely has influenced the evolution of our body form. As our bodies have adapted to run, it seems unusual that up to 79% of modern day runners are injured annually. The etiology of these injuries is clearly multifactorial. However, 1 aspect of running that has significantly changed over the past 50 years is the footwear we use. Modern running shoes have become increasingly cushioned and supportive, and have changed the way we run. In particular, they have altered our footstrike pattern from a predominantly forefoot strike(FFS) landing to a predominantly rearfoot strike(RFS) landing. This change alters the way in which the body is loaded and may be contributing to the high rate of injuries runners experience while engaged in an activity for which they were adapted. In this paper, we will examine the benefits of barefoot running(typically an FFS pattern),and compare the lower extremity mechanics between FFS and RFS. The implications of these mechanical differences, in terms of injury, will be discussed. We will then provide evidence to support our contention that FFS provides an optimal mechanical environment for specific foot and ankle structures, such as the heel pad, the plantar fascia, and the Achilles tendon. The importance of footwear will then be addressed, highlighting its interaction with strike pattern on mechanics. This analysis will underscore why footwear matters when assessing mechanics. Finally, proper preparation and safe transition to an FFS pattern in minimal shoes will be emphasized. Through the discussion of the current literature, we will develop a justification for returning to running in the way for which we were adapted to reduce running-related injuries.
文摘THE rapid growth of China＇s international trade has had a dramatic impact on its economy. Chi- na has grown in a short time to become the second largest economy in the world, In order to match its economy with the international use of its currency - the renminbi （RMB） - China has begun the process of RMB internationalization from the pilot cross-border RMB settlement scheme and capital account opening several years ago to facilitating and encouraging the use of the RMB outside the Chinese mainland.
基金National Natural Science Foundation of China,Grant/Award Numbers:52177154,51807144,51877155。
文摘In 2018-2019,two types of rocket-triggered lightning tests,that is,striking to ground and distribution line,were conducted in Guangdong,China.The main focus of this paper is to compare the waveform parameters of the return strokes(RS)from the two tests.For current,the 10%-90%risetime of RS from lightning striking to distribution line is 2.4 times higher than that striking to ground,and the differences in the other parameters are small.For close magnetic field,the RS from lightning striking to distribution line have a lower peak(30%lower after considering the peak current)and a larger risetime and half-peak width time;besides,it is necessary to divide the front edge of the close magnetic field waveform into two parts:leader(BL)and return stroke(BRS).For close electric field,the close RS electric field peak(ERS)was less sensitive to distance than the leader electric field peak(EL).For far electric field,the differences in waveform parameters of RS from the two tests were not significant,but after considering the peak current,the normalised initial electric field peak(EP)of RS from lightning striking to distribution line was 14%lower than that striking to ground.
基金National Natural Science Foundation of China,Grant/Award Number:52177154The Outstanding Youth Program of Hubei Natural Science Foundation,Grant/Award Number:2024AFA060the Fundamental Research Funds for the Central Universities,Grant/Award Number:2042023kf0183。
文摘In the summer of 2018–2019,rocket-triggered lightning experiments were conducted in Guangzhou,China.There were two types of lightning targets:ground and overhead line.By comparing the current and the electric field data in the two cases,it was found that when the continuous current level(ICC)and current amplitude(IM)of M-components(current pulses generated during the continuous current stage)are large,the time difference between the electric field peak and the current peak(TD)will always be small.The rise time(RT)and half peak width(THPW)of M-components with high ICC and IM are low in both the cases.The threshold upper limit of TD in the case of lightning striking the ground is higher,approxi-mately 2.6 times than that in the case of lightning striking the overhead line.We use an optimised guided wave model to simulate the electric field waveforms of M-components.It was found that the shorter RT and THPW of the M-component,the smaller TD.The changes in wave speed and IM cannot affect the size of TD,and the impact of distance changes is very weak.The difference in the threshold upper limit of TD may be related to the significant difference in ground impedance in two cases.
文摘The recent Strategic Economic Dialogue between China and the United States achieves some results but more talks are apparently needed to iron out fundamental differences Top Chinese and U.S. economic officials may justi- fiably take some pride in their
文摘National parks give life to ancient heritagesites in cities On these thriving spring days,China’s he ritage site protection is also embracing a new spring.This golden period began last October,when the
文摘Collective bargaining on wage at a Honda factory has set a precedent with potential ramifications for the whole economy After months of negotiations, workers at Honda Auto Parts Manufacturing Co. in Foshan City, south China’s Guangdong Province, secured an increase of 611 yuan ($96), or 32 percent, to their monthly pay on June 25.
文摘A half-decade gap between albums may be the norm for veteran rock stars holding on to what*s left of their music career.When it's a young band with massive potential and a solid fan-base,it's not so com-mon."We've been through a lot,both in and out of music,"explains Wang Xinjiu and He Fan,the founding members of Beijing noise rock outfit Birdstriking.
文摘A half-decade gap between albums may be the norm for veteran rock stars holding on to what's left of their music career:When it's a young band with massive potential and a solid fan-base,it's not so common."We've been through a lot,both in and out of music,"explains Wang Xinjju and He Fan,the founding members of Beijing noise rock outfit Birdstriking.
文摘The first Sunbeam Amateur PianoContest was held in the BeijingYouth Palace.More than 400people signed up and 130 of them wereselected to perform on stage.Theyoungest was 45 years old and the oldestwas 80.Most came from the BeijingTraining Class for Middle-aged andElderly People but some came from asfar away as Liaoning and Hubei.
文摘In 1891,a New York surgeon named William Coley injected cancer patients with live bacteria,observing with fascination as some tumors shrank amid raging fevers.His crude experiments-later deemed reckless-nonetheless revealed a tantalizing truth:The immune system,when properly provoked,could attack cancer.Over a century later,researchers have transformed this observation into a precision strike force.
基金supported by the Natural Science Foundation of China,Grant No.62103052.
文摘Drone swarm systems,equipped with photoelectric imaging and intelligent target perception,are essential for reconnaissance and strike missions in complex and high-risk environments.They excel in information sharing,anti-jamming capabilities,and combat performance,making them critical for future warfare.However,varied perspectives in collaborative combat scenarios pose challenges to object detection,hindering traditional detection algorithms and reducing accuracy.Limited angle-prior data and sparse samples further complicate detection.This paper presents the Multi-View Collaborative Detection System,which tackles the challenges of multi-view object detection in collaborative combat scenarios.The system is designed to enhance multi-view image generation and detection algorithms,thereby improving the accuracy and efficiency of object detection across varying perspectives.First,an observation model for three-dimensional targets through line-of-sight angle transformation is constructed,and a multi-view image generation algorithm based on the Pix2Pix network is designed.For object detection,YOLOX is utilized,and a deep feature extraction network,BA-RepCSPDarknet,is developed to address challenges related to small target scale and feature extraction challenges.Additionally,a feature fusion network NS-PAFPN is developed to mitigate the issue of deep feature map information loss in UAV images.A visual attention module(BAM)is employed to manage appearance differences under varying angles,while a feature mapping module(DFM)prevents fine-grained feature loss.These advancements lead to the development of BA-YOLOX,a multi-view object detection network model suitable for drone platforms,enhancing accuracy and effectively targeting small objects.
基金Supported by Research on Key Technologies of Lightning Intelligent Protection System for Guangdong Energy Hehe Sea Wind Farm(SFC/QZW-ZX-XF-24-020).
文摘In the past,the lightning strike risk assessment of wind farms mainly referred to the Lightning Protection Part 2:Risk Management(IEC 62305-2-2010)and the Lightning Protection of Wind Energy System(IEC 61400-24-2019)based on protection angle method.In fact,the basic idea of the two is the same,that is,the source of the lightning fan is replaced by S1-S4 of the former lightning building with the latter ND-NDJ.According to the above method of wind farm evaluation,it has been proved that the practice can not achieve good results.Taking offshore wind farm as an example,this paper introduces a new method of establishing six evaluation indicators to determine the risk level according to the new technology and compliance principle of regional lightning protection(semi-circular method),which can be used for reference by wind farm technicians.
文摘Objective: To observe the risk factors of thrombosis in patients with obstructive sleep apnea hypopnea syndrome (OSAHS).Methods: From February 2001 to April 2003, 24 patients with moderate and severe OSAHS (OSAHS group) and 19 healthy adults (control group) were recruited. Their blood samples were drawn at 6∶00 and 16∶00 respectively for testing hemocrit, platelet aggregation (PAG), whole blood viscosity (WBV), prothrombin time (PT), activated partial thromboplastin time (APTT), plasma fibrinogen (Fng) and endothelin (ET).Results: There was a significantly higher hemocrit, WBV, Fng and ET as well as a significant shortening of PT and APTT at 6∶00 than that at 16∶00 in OSAHS group. However, there was no significant difference in all testing items between 6∶00 and 16∶00 in control group. The hemocrit, WBV, PAG, plasma Fng and ET were significantly higher, and PT and APTT were obviously shorter at 6∶00 in OSAHS group than those at 6∶00 in control group. A higher hemocrit, PAG, plasma Fng and ET, a longer PT and APTT were observed at 16∶00 in OSAHS group, compared with those at 16∶00 in control group.Conclusion: In OSAHS patients there were striking risk factors of thrombosis, which is more remarkable in the early morning than in the afternoon.
