This study examines the effects of fall experience caused by tripping on the movement of stepping over an obstacle. The participants were divided into 3 groups (26 fallers caused by tripping, 24 fallers caused by othe...This study examines the effects of fall experience caused by tripping on the movement of stepping over an obstacle. The participants were divided into 3 groups (26 fallers caused by tripping, 24 fallers caused by other causes, and 145 non-fallers). Participants stepped forward over a 10 cm high obstacle with one leg, and then returned to their original position five times as quickly as possible. The OSFS (obstacle single leg forward step) test was measured in the following 2 phases: the OSFS-F phase, in which participants stepped out on one leg, and the OSFS-R phase, in which they returned it. Significant differences among the three groups were found in all parameters, and the fallers by tripping were significantly inferior to the non-fallers. There were no significant differences between the fallers by other reasons and the non-fallers in all parameters. The fallers by tripping were slower in the obstacle step movement than the non-fallers.展开更多
Stainless steels are used in a wide range of complex environments due to their excellent corrosion resistance.Multiphase stainless steels can offer an excellent combination of strength,toughness and corrosion resistan...Stainless steels are used in a wide range of complex environments due to their excellent corrosion resistance.Multiphase stainless steels can offer an excellent combination of strength,toughness and corrosion resistance due to the coexistence of different microstructures.The microstructure and mechanical properties of a novel cast multiphase stainless steel,composed of martensite,ferrite,and austenite,were investigated following appropriate heat treatment processes:solution treatment at 1,050℃ for 0.5 h followed by water quenching to room temperature,and aging treatment at 500℃ for 4 h followed by water quenching to room temperature.Results show reversed austenite is formed by diffusion of Ni element during aging process,and the enrichment of Ni atoms directly determines the mechanical stability of austenite.The austenite with a lower Ni content undergoes a martensitic transformation during plastic deformation.The tensile strength of the specimen exceeds 1,100 MPa and the elongation exceeds 24%after solid solution,and further increases to 1,247 MPa and 25%after aging treatment.This enhancement is due to the TRIP effect of austenite and the precipitation of the nanoscale G-phase pinning dislocations in ferrite and martensite.展开更多
Two recent trips to cities in China got me thinking a lot about China’s development and efforts to maintain its identity.While China is developing with strong momentum in every sector,it has succeeded at preserving a...Two recent trips to cities in China got me thinking a lot about China’s development and efforts to maintain its identity.While China is developing with strong momentum in every sector,it has succeeded at preserving and upholding its ancient traditions and customs.These trips showed me a country not only keen on technological and infrastructural advancement but also deeply committed to cultural preservation and promotion.In every corner of these cities,I witnessed a harmonious blend of the old and new,a testament to China’s dedication to maintaining its cultural heritage while embracing modernity.展开更多
The 474 million trips-raking in RMB 632.69 billion of tourism-related revenue-during the eight-day Spring Festival holiday indisputably signifies both the vitality of China’s economy and the huge potential of the cou...The 474 million trips-raking in RMB 632.69 billion of tourism-related revenue-during the eight-day Spring Festival holiday indisputably signifies both the vitality of China’s economy and the huge potential of the country’s domestic consumption.The figures respectively represent a 19 percent increase and a 7.7 percent growth over those for the same holiday period,prior to the COVID-19 pandemic,in 2019,according to data released by the country’s Ministry of Culture and Tourism on February 18.展开更多
Foreign tourists'trips to China recently reached a new height,both online and offline.Travel agents around the world also made trips to China,generating more thoughts for the development of new routes and the desi...Foreign tourists'trips to China recently reached a new height,both online and offline.Travel agents around the world also made trips to China,generating more thoughts for the development of new routes and the design of innovative tourist products,and contributing to the development of China's inbound tourism.展开更多
Chinese New Year holiday has ignited a new round of consumption boom.During the eight-day holiday,China experienced an estimated 474 million domestic travel trips,China's Ministry of Culture and Tourism reported.T...Chinese New Year holiday has ignited a new round of consumption boom.During the eight-day holiday,China experienced an estimated 474 million domestic travel trips,China's Ministry of Culture and Tourism reported.The number of trips marked the 34.3%increase from the year prior and a 19%jump from 2019.According to government figures,domestic tourists spent over 632.687 billion yuan,an increase of 7.7%compared to holiday spending in 2019 and a 47.3%year-over-year hike.China witnessed approximately 6.83 million cross-border tourists during the holiday period,with about 3.6 million outbound tourists and 3.23 million inbound tourists.展开更多
The passenger flow in Moroccan airports reached a record high of over 27 million trips in 2023,increasing by 32 percent year on year,the Moroccan Airports Authority(ONDA)said on 15 January.
In order to improve the lightning protection performance of transmission lines, lightning protection management has been divided into every tower that lightning protection performance has been evaluated respectively. ...In order to improve the lightning protection performance of transmission lines, lightning protection management has been divided into every tower that lightning protection performance has been evaluated respectively. According to factors such as landform, span, tower type, grounding resistance, isolator type, and so on, relative ratio of tripping operation of every tower in the line has been calculated to evaluate its lightning protection safety performance, it is beneficial to operation maintenance and lightning reconstruction of transmission lines.展开更多
To achieve the mobility of computers during communication, the TCP connections between fixed host and mobile host may often traverse wired and wireless networks, and the recovery of losses due to wireless transmission...To achieve the mobility of computers during communication, the TCP connections between fixed host and mobile host may often traverse wired and wireless networks, and the recovery of losses due to wireless transmission error is much different from congestion control. The paper analyzes the side effect of RTT estimation while making the TCP source to handle congestion and wireless error losses properly. Then present a strategy using information feedback by the last hop acknowledgement and monitoring the queuing level of the wired bottleneck link by calculating the changes in transmission delay along the path. With the identification of the early stage of congestion, it can respond to wired congestion quickly while keeping wireless link more reliable, and make TCP react to the different packets losses more appropriately.展开更多
文摘This study examines the effects of fall experience caused by tripping on the movement of stepping over an obstacle. The participants were divided into 3 groups (26 fallers caused by tripping, 24 fallers caused by other causes, and 145 non-fallers). Participants stepped forward over a 10 cm high obstacle with one leg, and then returned to their original position five times as quickly as possible. The OSFS (obstacle single leg forward step) test was measured in the following 2 phases: the OSFS-F phase, in which participants stepped out on one leg, and the OSFS-R phase, in which they returned it. Significant differences among the three groups were found in all parameters, and the fallers by tripping were significantly inferior to the non-fallers. There were no significant differences between the fallers by other reasons and the non-fallers in all parameters. The fallers by tripping were slower in the obstacle step movement than the non-fallers.
基金supported by the Inner Mongolia Autonomous Region Science and Technology Major Special Project(Grant No.2021SZD0082).
文摘Stainless steels are used in a wide range of complex environments due to their excellent corrosion resistance.Multiphase stainless steels can offer an excellent combination of strength,toughness and corrosion resistance due to the coexistence of different microstructures.The microstructure and mechanical properties of a novel cast multiphase stainless steel,composed of martensite,ferrite,and austenite,were investigated following appropriate heat treatment processes:solution treatment at 1,050℃ for 0.5 h followed by water quenching to room temperature,and aging treatment at 500℃ for 4 h followed by water quenching to room temperature.Results show reversed austenite is formed by diffusion of Ni element during aging process,and the enrichment of Ni atoms directly determines the mechanical stability of austenite.The austenite with a lower Ni content undergoes a martensitic transformation during plastic deformation.The tensile strength of the specimen exceeds 1,100 MPa and the elongation exceeds 24%after solid solution,and further increases to 1,247 MPa and 25%after aging treatment.This enhancement is due to the TRIP effect of austenite and the precipitation of the nanoscale G-phase pinning dislocations in ferrite and martensite.
文摘Two recent trips to cities in China got me thinking a lot about China’s development and efforts to maintain its identity.While China is developing with strong momentum in every sector,it has succeeded at preserving and upholding its ancient traditions and customs.These trips showed me a country not only keen on technological and infrastructural advancement but also deeply committed to cultural preservation and promotion.In every corner of these cities,I witnessed a harmonious blend of the old and new,a testament to China’s dedication to maintaining its cultural heritage while embracing modernity.
文摘The 474 million trips-raking in RMB 632.69 billion of tourism-related revenue-during the eight-day Spring Festival holiday indisputably signifies both the vitality of China’s economy and the huge potential of the country’s domestic consumption.The figures respectively represent a 19 percent increase and a 7.7 percent growth over those for the same holiday period,prior to the COVID-19 pandemic,in 2019,according to data released by the country’s Ministry of Culture and Tourism on February 18.
文摘Foreign tourists'trips to China recently reached a new height,both online and offline.Travel agents around the world also made trips to China,generating more thoughts for the development of new routes and the design of innovative tourist products,and contributing to the development of China's inbound tourism.
文摘Chinese New Year holiday has ignited a new round of consumption boom.During the eight-day holiday,China experienced an estimated 474 million domestic travel trips,China's Ministry of Culture and Tourism reported.The number of trips marked the 34.3%increase from the year prior and a 19%jump from 2019.According to government figures,domestic tourists spent over 632.687 billion yuan,an increase of 7.7%compared to holiday spending in 2019 and a 47.3%year-over-year hike.China witnessed approximately 6.83 million cross-border tourists during the holiday period,with about 3.6 million outbound tourists and 3.23 million inbound tourists.
文摘The passenger flow in Moroccan airports reached a record high of over 27 million trips in 2023,increasing by 32 percent year on year,the Moroccan Airports Authority(ONDA)said on 15 January.
文摘In order to improve the lightning protection performance of transmission lines, lightning protection management has been divided into every tower that lightning protection performance has been evaluated respectively. According to factors such as landform, span, tower type, grounding resistance, isolator type, and so on, relative ratio of tripping operation of every tower in the line has been calculated to evaluate its lightning protection safety performance, it is beneficial to operation maintenance and lightning reconstruction of transmission lines.
文摘To achieve the mobility of computers during communication, the TCP connections between fixed host and mobile host may often traverse wired and wireless networks, and the recovery of losses due to wireless transmission error is much different from congestion control. The paper analyzes the side effect of RTT estimation while making the TCP source to handle congestion and wireless error losses properly. Then present a strategy using information feedback by the last hop acknowledgement and monitoring the queuing level of the wired bottleneck link by calculating the changes in transmission delay along the path. With the identification of the early stage of congestion, it can respond to wired congestion quickly while keeping wireless link more reliable, and make TCP react to the different packets losses more appropriately.
