This study analyzes the function of different muscles during arm wrestling and proposes a method to analyze the optimal forearm angle for professional arm wrestlers.We built a professional arm-wrestling platform to me...This study analyzes the function of different muscles during arm wrestling and proposes a method to analyze the optimal forearm angle for professional arm wrestlers.We built a professional arm-wrestling platform to measure the shape and deformation of the skin at the biceps brachii of a volunteer in vivo during arm wrestling.We observed the banding phenomenon of arm skin strain during muscle contraction and developed a model to evaluate the moment provided by the biceps brachii.According to this model,the strain field of the area of interest on the skin was measured,and the forearm angles most favorable and unfavorable to the work of the biceps brachii were analyzed.This study demonstrates the considerable potential of applying DIC and its extension method to the in vivo measurement of human skin and facilitates the use of the in vivo measurement of skin deformation in various sports in the future.展开更多
Three new species,Phyllocoptes angustais sp.nov.infesting Sibiraea angustata(Rehd.)Hand.-Mazz.(Rosaceae),Aculops brevifolis sp.nov.infesting Caragana brevifolia Kom.(Leguminosae),and Diptacus acutifolius sp.nov.infest...Three new species,Phyllocoptes angustais sp.nov.infesting Sibiraea angustata(Rehd.)Hand.-Mazz.(Rosaceae),Aculops brevifolis sp.nov.infesting Caragana brevifolia Kom.(Leguminosae),and Diptacus acutifolius sp.nov.infesting Cotoneaster acutifolius Turcz.(Rosaceae),are described and illustrated.All mites are collected from Maixiu National Forest Park,Zeku County,Huangnan Tibetan Autonomous Prefecture,Qinghai Province,China and are vagrant on the undersurfaces of leaves of their host plants.展开更多
The Qilian Mountain National Park,which covers a total area of 50,200 km2 and locates at the junction area of Gansu and Qinghai Provinces,is an important ecological safety barrier of Northwestern China and an importan...The Qilian Mountain National Park,which covers a total area of 50,200 km2 and locates at the junction area of Gansu and Qinghai Provinces,is an important ecological safety barrier of Northwestern China and an important water source of the Yellow River.In July 2020,a survey was conducted for eriophyid mites of Qilian Mountain National Park.Some eriophyid mites living bodies were collected by the prior author.Two news species were identified,namely:Epitrimerus fruticus sp.nov.,infesting Potentilla fruticosa L.(Rosaceae);Rhyncaphytoptus sigouensis sp.nov.,infesting Salix myrtillacea Anderss(Salicaceae).展开更多
基金This study was supported by the National Natural Science Foun-dation of China(NSFC)(No.11902074).
文摘This study analyzes the function of different muscles during arm wrestling and proposes a method to analyze the optimal forearm angle for professional arm wrestlers.We built a professional arm-wrestling platform to measure the shape and deformation of the skin at the biceps brachii of a volunteer in vivo during arm wrestling.We observed the banding phenomenon of arm skin strain during muscle contraction and developed a model to evaluate the moment provided by the biceps brachii.According to this model,the strain field of the area of interest on the skin was measured,and the forearm angles most favorable and unfavorable to the work of the biceps brachii were analyzed.This study demonstrates the considerable potential of applying DIC and its extension method to the in vivo measurement of human skin and facilitates the use of the in vivo measurement of skin deformation in various sports in the future.
基金This work is supported by Biodiversity Background Survey in Maixiu National Forest Park,Huangnan Tibetan Autonomous Prefecture,Qinghai Province,China.
文摘Three new species,Phyllocoptes angustais sp.nov.infesting Sibiraea angustata(Rehd.)Hand.-Mazz.(Rosaceae),Aculops brevifolis sp.nov.infesting Caragana brevifolia Kom.(Leguminosae),and Diptacus acutifolius sp.nov.infesting Cotoneaster acutifolius Turcz.(Rosaceae),are described and illustrated.All mites are collected from Maixiu National Forest Park,Zeku County,Huangnan Tibetan Autonomous Prefecture,Qinghai Province,China and are vagrant on the undersurfaces of leaves of their host plants.
基金supported by a special project funding for insect survey from the Qinghai Provincial Administration of Qilian Mountain National Park(In 2019the Second Batch of Forestry Reform and Development Funds subsidies for National Nature Reserves:Qilian Mountain National Park Capacity Construction Project 2019-061).
文摘The Qilian Mountain National Park,which covers a total area of 50,200 km2 and locates at the junction area of Gansu and Qinghai Provinces,is an important ecological safety barrier of Northwestern China and an important water source of the Yellow River.In July 2020,a survey was conducted for eriophyid mites of Qilian Mountain National Park.Some eriophyid mites living bodies were collected by the prior author.Two news species were identified,namely:Epitrimerus fruticus sp.nov.,infesting Potentilla fruticosa L.(Rosaceae);Rhyncaphytoptus sigouensis sp.nov.,infesting Salix myrtillacea Anderss(Salicaceae).
