As a versatile star product,poly(viny chloride)(PVC)has kept active in our dily lif all through since it was invented.However,the severe fire hazard andheavy smoke produced during combustion,particularly the extensive...As a versatile star product,poly(viny chloride)(PVC)has kept active in our dily lif all through since it was invented.However,the severe fire hazard andheavy smoke produced during combustion,particularly the extensively used flexible PC product,have been putzig manufacturers and researchers forages.Over the last decade,multifarious ftame retardants and smoke suppressants were developed for PVC materias.n this review combined literaturewith the results based on the research from our group,recent emerged fame retardants and smoke suppressants for PVC are introduced.Meanwhile,theflame retardant mechanisms and experimental analysis resuts are described to understand the relationship between characters of fame retardants (in-cluding chemical compositions,structures or morphologies)and fire performance of the composites.The potential substitutes for traditional harmfulflame retardant antimony trioxide are discussed aiming to the emphasis on increasing prominent environmental concerns.ln partcular,one section isdedicated to new approaches for the preparation of novel environmentally friendly and high-effciency fame retardants.is hoped that ths review wilnot only summarine the new emerged fame retardants and smoke suppressants for PVC,but also provide the new trend to prompt sequent explorationin both academic research and industrial application.展开更多
The performance of task scheduling algorithm in cloud computing determines the performance of the cloud system.This study mainly analyzed the application of the artificial bee colony(ABC)algorithm in the cloud task sc...The performance of task scheduling algorithm in cloud computing determines the performance of the cloud system.This study mainly analyzed the application of the artificial bee colony(ABC)algorithm in the cloud task scheduling.In order to solve the problem of cloud task scheduling,the ABC algorithm was discretized to get the discrete artificial bee colony(DABC)algorithm.Then the mathematical model of cloud task scheduling was established and solved by the DABC algorithm.Finally,the simulation experiment was carried out,and the performance of first-come-first-served(FCFS),MIN–MIN,ABC and DABC algorithms under different cloud tasks was compared to verify the performance of the proposed algorithm.The results showed that the user waiting time of the DABC algorithm was 1210s,the load balance degree was 0.01,and the user payment fee was 1688 yuan when the number of cloud tasks was 500;compared with other algorithms,the user waiting time of the DABC algorithm was shorter,the resource load balance degree was higher,and the overall performance was better.The research results verify the effectiveness of the DABC algorithm in solving the problem of cloud task optimal scheduling,and it can be further extended and applied in practice.展开更多
基金This research is funded bv Beijing Institute of Technology Research Fund Program for Young Scholars(grant number:2020CX04129).
文摘As a versatile star product,poly(viny chloride)(PVC)has kept active in our dily lif all through since it was invented.However,the severe fire hazard andheavy smoke produced during combustion,particularly the extensively used flexible PC product,have been putzig manufacturers and researchers forages.Over the last decade,multifarious ftame retardants and smoke suppressants were developed for PVC materias.n this review combined literaturewith the results based on the research from our group,recent emerged fame retardants and smoke suppressants for PVC are introduced.Meanwhile,theflame retardant mechanisms and experimental analysis resuts are described to understand the relationship between characters of fame retardants (in-cluding chemical compositions,structures or morphologies)and fire performance of the composites.The potential substitutes for traditional harmfulflame retardant antimony trioxide are discussed aiming to the emphasis on increasing prominent environmental concerns.ln partcular,one section isdedicated to new approaches for the preparation of novel environmentally friendly and high-effciency fame retardants.is hoped that ths review wilnot only summarine the new emerged fame retardants and smoke suppressants for PVC,but also provide the new trend to prompt sequent explorationin both academic research and industrial application.
文摘The performance of task scheduling algorithm in cloud computing determines the performance of the cloud system.This study mainly analyzed the application of the artificial bee colony(ABC)algorithm in the cloud task scheduling.In order to solve the problem of cloud task scheduling,the ABC algorithm was discretized to get the discrete artificial bee colony(DABC)algorithm.Then the mathematical model of cloud task scheduling was established and solved by the DABC algorithm.Finally,the simulation experiment was carried out,and the performance of first-come-first-served(FCFS),MIN–MIN,ABC and DABC algorithms under different cloud tasks was compared to verify the performance of the proposed algorithm.The results showed that the user waiting time of the DABC algorithm was 1210s,the load balance degree was 0.01,and the user payment fee was 1688 yuan when the number of cloud tasks was 500;compared with other algorithms,the user waiting time of the DABC algorithm was shorter,the resource load balance degree was higher,and the overall performance was better.The research results verify the effectiveness of the DABC algorithm in solving the problem of cloud task optimal scheduling,and it can be further extended and applied in practice.
