Purpose：The aim of this study was to test and expand the Motivation of Marathoners Scale（MOMS） model（Masters et al.,1993）.Methods：The MOMS questionnaire was distributed to 306 male and female marathon runners（a...Purpose：The aim of this study was to test and expand the Motivation of Marathoners Scale（MOMS） model（Masters et al.,1993）.Methods：The MOMS questionnaire was distributed to 306 male and female marathon runners（age range：20–77 years） with experience in marathon running（range：1–44 runs）.A confirmatory factor analysis（CFA） revealed that the original Purpose：The aim of this study was to test and expand the Motivation of Marathoners Scale（MOMS） model（Masters et al.,1993）.Methods：The MOMS questionnaire was distributed to 306 male and female marathon runners（age range：20-77 years） with experience in marathon running（range：1-44 runs）.A confirmatory factor analysis（CFA） revealed that the original model failed to fit the data.Hence,exploratory factor analysis（EFA） was performed to test the best factorial solution for the current data,and a subsequent CFA was performed on the revised factorial structure.Then,a series of EFAs using maximum likelihood factor extraction method were performed.Results：The best structure solution for model-data fit resulted in 11 factors：psychological coping-emotional-related coping,psychological coping-everyday-life management,life meaning,self-esteem,recognition,affiliation,weight concerns,general health orientation-reduced disease prevalence and longevity,general health orientation-keep fit,competition,and personal goal achievement.Conclusion：This study provides a sound and solid framework for studying motivation for physically demanding tasks such as marathon runs,and needs to be similarly applied and tested in studies incorporating physical tasks which vary in mental demands.展开更多
Rain-wind-induced vibration of cable was studied based on previous research achievements. According to the quasi-steady assumption, the governing equation of vertical motion of the cable was derived and the criterion ...Rain-wind-induced vibration of cable was studied based on previous research achievements. According to the quasi-steady assumption, the governing equation of vertical motion of the cable was derived and the criterion for unstable motion and occurrence mechanism was studied. A comparison was performed between the oscillation responses of the stay cable obtained from calculated model and previous results. The results indicate that the analysis model can reflect the main characteristics of wind-rain-induced vibrationt of the cable which is amplitude- and velocity-restricted, and it is probably related with the periodic vortex shedding of wake flow. It is essential for the occurrence of rain-wind-induced or wind-induced vibration of cable that the derivative of lift coefficient with respect to transient angle of attack is less than zero. When rain-wind-induced vibration occurs, the aerodynamic force has a dual function for the vibration, and the maximum amplitude of stayed-cable is determined by the relative value of aerodynamic exciting force and aerodynamic damping force.展开更多
The Mw 7.8 Gorkha earthquake in Nepal on April 25, 2015, produced thousands of landslides in the Himalayan mountain range. After the earthquake, two field investigations along Araniko Highway were conducted. Then, usi...The Mw 7.8 Gorkha earthquake in Nepal on April 25, 2015, produced thousands of landslides in the Himalayan mountain range. After the earthquake, two field investigations along Araniko Highway were conducted. Then, using remote sensing technology and geographic information system(GIS)technology, 1481 landslides were identified along the Bhote Koshi river. Correlations between the spatial distribution of landslides with slope gradient and lithology were analyzed. The power-law relationship of the size distribution of earthquake-induced landslides was examined in both the Higher Himalaya and Lesser Himalaya. Possible reasons for the variability of the power exponent were explored by examining differences in the geological situations of these areas. Multi-threshold cellular automata were introduced to model the complexity of system components. Most of the landslides occurred at slope gradients of 30°–40°, and the landslide density was positively correlated with slope gradient. Landslides in hard rock areas were more common than in soft rock areas. The cumulative number-area distribution of landslides induced by the Gorkha earthquake exhibited a negative power-law relationship, but the power exponents were different: 1.13 in the Higher Himalaya, 1.36 and Lesser Himalaya. Furthermore,the geological conditions were more complex and varied in the Lesser Himalaya than in the Higher Himalaya, and the cellular automata simulation results indicated that, as the complexity of system components increased, the power exponent increased.Therefore, the variability of the power exponent of landslide size distribution should ascribe to the complexity of geological situations in the Bhote Koshi river watershed.展开更多
文摘Purpose：The aim of this study was to test and expand the Motivation of Marathoners Scale（MOMS） model（Masters et al.,1993）.Methods：The MOMS questionnaire was distributed to 306 male and female marathon runners（age range：20–77 years） with experience in marathon running（range：1–44 runs）.A confirmatory factor analysis（CFA） revealed that the original Purpose：The aim of this study was to test and expand the Motivation of Marathoners Scale（MOMS） model（Masters et al.,1993）.Methods：The MOMS questionnaire was distributed to 306 male and female marathon runners（age range：20-77 years） with experience in marathon running（range：1-44 runs）.A confirmatory factor analysis（CFA） revealed that the original model failed to fit the data.Hence,exploratory factor analysis（EFA） was performed to test the best factorial solution for the current data,and a subsequent CFA was performed on the revised factorial structure.Then,a series of EFAs using maximum likelihood factor extraction method were performed.Results：The best structure solution for model-data fit resulted in 11 factors：psychological coping-emotional-related coping,psychological coping-everyday-life management,life meaning,self-esteem,recognition,affiliation,weight concerns,general health orientation-reduced disease prevalence and longevity,general health orientation-keep fit,competition,and personal goal achievement.Conclusion：This study provides a sound and solid framework for studying motivation for physically demanding tasks such as marathon runs,and needs to be similarly applied and tested in studies incorporating physical tasks which vary in mental demands.
基金Project(51078170) supported by the National Natural Science Foundation of ChinaProject(10JDG097) supported by Jiangsu University Talents Funds,China
文摘Rain-wind-induced vibration of cable was studied based on previous research achievements. According to the quasi-steady assumption, the governing equation of vertical motion of the cable was derived and the criterion for unstable motion and occurrence mechanism was studied. A comparison was performed between the oscillation responses of the stay cable obtained from calculated model and previous results. The results indicate that the analysis model can reflect the main characteristics of wind-rain-induced vibrationt of the cable which is amplitude- and velocity-restricted, and it is probably related with the periodic vortex shedding of wake flow. It is essential for the occurrence of rain-wind-induced or wind-induced vibration of cable that the derivative of lift coefficient with respect to transient angle of attack is less than zero. When rain-wind-induced vibration occurs, the aerodynamic force has a dual function for the vibration, and the maximum amplitude of stayed-cable is determined by the relative value of aerodynamic exciting force and aerodynamic damping force.
基金supported by the National Natural Science Foundation of China (Grant No. 41571004)National Program on Key Research Project of China (Grant No. 2016YFC0802206)+1 种基金Key Laboratory Foundation of Mountain Hazards and Earth Surface Processes, Chinese Academy of Sciences (Grant No. KLMHESP-17-03)the Fundamental Research Funds for the Central Universities of China (Grant No. 2682016CX003)
文摘The Mw 7.8 Gorkha earthquake in Nepal on April 25, 2015, produced thousands of landslides in the Himalayan mountain range. After the earthquake, two field investigations along Araniko Highway were conducted. Then, using remote sensing technology and geographic information system(GIS)technology, 1481 landslides were identified along the Bhote Koshi river. Correlations between the spatial distribution of landslides with slope gradient and lithology were analyzed. The power-law relationship of the size distribution of earthquake-induced landslides was examined in both the Higher Himalaya and Lesser Himalaya. Possible reasons for the variability of the power exponent were explored by examining differences in the geological situations of these areas. Multi-threshold cellular automata were introduced to model the complexity of system components. Most of the landslides occurred at slope gradients of 30°–40°, and the landslide density was positively correlated with slope gradient. Landslides in hard rock areas were more common than in soft rock areas. The cumulative number-area distribution of landslides induced by the Gorkha earthquake exhibited a negative power-law relationship, but the power exponents were different: 1.13 in the Higher Himalaya, 1.36 and Lesser Himalaya. Furthermore,the geological conditions were more complex and varied in the Lesser Himalaya than in the Higher Himalaya, and the cellular automata simulation results indicated that, as the complexity of system components increased, the power exponent increased.Therefore, the variability of the power exponent of landslide size distribution should ascribe to the complexity of geological situations in the Bhote Koshi river watershed.
