In gear transmission,temperature rise has a non-negligible impact on the accuracy,noise and transmission efficiency.However,there is no relevant research on the temperature rise of the anti-backlash single-roller enve...In gear transmission,temperature rise has a non-negligible impact on the accuracy,noise and transmission efficiency.However,there is no relevant research on the temperature rise of the anti-backlash single-roller enveloping hourglass worm(ASEHW)gear.To solve this problem,based on tribology principle and Hertz contact theory,the thermal power calculation method of the ASEHW gear was proposed for the first time and thermal analysis was carried out by Ansys software.The bulk temperature of the ASEHW gear under four different rotating speed(300 r/min,600 r/min,900 r/min,1200 r/min)is calculated.The main factors causing temperature rise of the ASEHW gear are analyzed theoretically.Meanwhile,an experimental study is performed to verify the simulation results and validate the theory methods.The theory presented in this paper provides a solution for the thermal power calculation of ASEHW gear.This research provides a theoretical basis for further optimization of ASEHW gear.展开更多
Summary What is already known about this topic?Millettia pachycarpa belongs to the Fabaceae family and is widely distributed in the southern China.It is toxic for the rotenone contained in its roots and seeds,and inge...Summary What is already known about this topic?Millettia pachycarpa belongs to the Fabaceae family and is widely distributed in the southern China.It is toxic for the rotenone contained in its roots and seeds,and ingesting its seeds could result in poisoning.What is added by this report?In December,2020,a poisoning from plant seeds occurred in Chongqing Municipality.The etiological association was confirmed based on epidemiological investigation,clinical manifestation.展开更多
With the era of big data approaching,the number of software systems,their dependencies,as well as the complexity of the individual system is becoming larger and more intricate.Understanding these evolving software sys...With the era of big data approaching,the number of software systems,their dependencies,as well as the complexity of the individual system is becoming larger and more intricate.Understanding these evolving software systems is thus a primary challenge for cost-effective software management and maintenance.In this paper we perform a case study with evolving code clones.The programmers often need to manually analyze the co-evolution of clone fragments to decide about refactoring,tracking,and bug removal.However,manual analysis is time consuming,and nearly infeasible for a large number of clones,e.g.,with millions of similarity pairs,where clones are evolving over hundreds of software revisions.We propose an interactive visual analytics system,Clone-World,which leverages big data visualization approach to manage code clones in large software systems.Clone-World,gives an intuitive yet powerful solution to the clone analytic problems.Clone-World combines multiple informationlinked zoomable views,where users can explore and analyze clones through interactive exploration in real time.User studies and experts’reviews suggest that Clone-World may assist developers in many real-life software development and maintenance scenarios.We believe that Clone-World will ease the management and maintenance of clones,and inspire future innovation to adapt visual analytics to manage big software systems.展开更多
基金National Natural Science Foundation of China(Grant No.51875479)Innovation Fund of Postgraduate of Xihua University,China(Grant No.ycjj2019040).
文摘In gear transmission,temperature rise has a non-negligible impact on the accuracy,noise and transmission efficiency.However,there is no relevant research on the temperature rise of the anti-backlash single-roller enveloping hourglass worm(ASEHW)gear.To solve this problem,based on tribology principle and Hertz contact theory,the thermal power calculation method of the ASEHW gear was proposed for the first time and thermal analysis was carried out by Ansys software.The bulk temperature of the ASEHW gear under four different rotating speed(300 r/min,600 r/min,900 r/min,1200 r/min)is calculated.The main factors causing temperature rise of the ASEHW gear are analyzed theoretically.Meanwhile,an experimental study is performed to verify the simulation results and validate the theory methods.The theory presented in this paper provides a solution for the thermal power calculation of ASEHW gear.This research provides a theoretical basis for further optimization of ASEHW gear.
文摘Summary What is already known about this topic?Millettia pachycarpa belongs to the Fabaceae family and is widely distributed in the southern China.It is toxic for the rotenone contained in its roots and seeds,and ingesting its seeds could result in poisoning.What is added by this report?In December,2020,a poisoning from plant seeds occurred in Chongqing Municipality.The etiological association was confirmed based on epidemiological investigation,clinical manifestation.
文摘With the era of big data approaching,the number of software systems,their dependencies,as well as the complexity of the individual system is becoming larger and more intricate.Understanding these evolving software systems is thus a primary challenge for cost-effective software management and maintenance.In this paper we perform a case study with evolving code clones.The programmers often need to manually analyze the co-evolution of clone fragments to decide about refactoring,tracking,and bug removal.However,manual analysis is time consuming,and nearly infeasible for a large number of clones,e.g.,with millions of similarity pairs,where clones are evolving over hundreds of software revisions.We propose an interactive visual analytics system,Clone-World,which leverages big data visualization approach to manage code clones in large software systems.Clone-World,gives an intuitive yet powerful solution to the clone analytic problems.Clone-World combines multiple informationlinked zoomable views,where users can explore and analyze clones through interactive exploration in real time.User studies and experts’reviews suggest that Clone-World may assist developers in many real-life software development and maintenance scenarios.We believe that Clone-World will ease the management and maintenance of clones,and inspire future innovation to adapt visual analytics to manage big software systems.
