Three different treatment methods, including topical application method, injection method and immersion method were employed to treat 17or - hydroxyprogesterone, so as to investigating its effect on ovarian developmen...Three different treatment methods, including topical application method, injection method and immersion method were employed to treat 17or - hydroxyprogesterone, so as to investigating its effect on ovarian development red swamp crayfish （Procambarus clarkii）. The results showed that all the three differ- ent methods could facilitate the synchronous ovarian development of red swamp crayfish at different degree, with the degree of maturity of 10% high compared with the control group. The highest maturity degree was 50% that was observed in immersion treatment group. The effect was determined as in order immersion method 〉 injection method 〉 topical apphcation method 〉 control group. The immersion method and the injection method could facilitate synchronization spawning of red swamp crayfish, with the order of immersion method 32.5%, injection method 20%, topical application 17.5% and the control group 17.5 %. Taking the synchro- nization spawning rate, final spawning rate and mortality into account, the order was the immersion method 〉 injection method 〉 topical application method 〉 control group.展开更多
It is difficult to build an effective water flooding displacement pressure system in the middle section of a horizontal well in an ultra-low permeability sandstone reservoir.To solve this problem,this study proposes t...It is difficult to build an effective water flooding displacement pressure system in the middle section of a horizontal well in an ultra-low permeability sandstone reservoir.To solve this problem,this study proposes to use packers,sealing cannula and other tools in the same horizontal well to inject water in some fractures and produce oil from other fractures.This new energy supplement method forms a segmental synchronous injection-production system in a horizontal well.The method can reduce the distance between the injection end and the production end,and quickly establish an effective displacement system.Changing the displacement between wells to displacement between horizontal well sections,and point water flooding to linear uniform water flooding,the method can enhance water sweeping volume and shorten waterflooding response period.The research shows that:(1)In the synchronous injection and production of horizontal well in an ultra-low-permeability sandstone reservoir,the water injection section should select the section where the natural fractures and artificial fractures are in the same direction or the section with no natural fractures,and the space between two sections should be 60?80 m.(2)In addition to controlling injection pressure,periodic water injection can be taken to reduce the risk of re-opening and growth of natural fractures or formation fracture caused by the gradual increase of water injection pressure with water injection going on.(3)Field tests have verified that this method can effectively improve the output of single well and achieve good economic benefits,so it can be widely used in the development of ultra-low permeability sandstone reservoirs.展开更多
针对新能源汽车控制器开发周期长、无法快速进行小批量生产等问题,该文应用基于模型的快速开发方法进行永磁同步电机控制算法开发。文中先分析了永磁同步电机的数学模型,在此基础上设计了速度环的ADRC算法;然后在D2P(development to pro...针对新能源汽车控制器开发周期长、无法快速进行小批量生产等问题,该文应用基于模型的快速开发方法进行永磁同步电机控制算法开发。文中先分析了永磁同步电机的数学模型,在此基础上设计了速度环的ADRC算法;然后在D2P(development to production)平台下,搭建车用永磁同步电机矢量控制代码模型,以及代码自动生成和仿真验证;最后进行台架试验,验证控制算法,在线整定参数,实现控制算法的快速开发。实验结果表明,采用基于模型的快速开发方法能够缩短开发周期和成本,并且自动生成的代码具有较高的可靠性,能满足新能源汽车各项性能要求。展开更多
文摘Three different treatment methods, including topical application method, injection method and immersion method were employed to treat 17or - hydroxyprogesterone, so as to investigating its effect on ovarian development red swamp crayfish （Procambarus clarkii）. The results showed that all the three differ- ent methods could facilitate the synchronous ovarian development of red swamp crayfish at different degree, with the degree of maturity of 10% high compared with the control group. The highest maturity degree was 50% that was observed in immersion treatment group. The effect was determined as in order immersion method 〉 injection method 〉 topical apphcation method 〉 control group. The immersion method and the injection method could facilitate synchronization spawning of red swamp crayfish, with the order of immersion method 32.5%, injection method 20%, topical application 17.5% and the control group 17.5 %. Taking the synchro- nization spawning rate, final spawning rate and mortality into account, the order was the immersion method 〉 injection method 〉 topical application method 〉 control group.
基金Supported by the China National Science and Technology Major Project(2016ZX05050)
文摘It is difficult to build an effective water flooding displacement pressure system in the middle section of a horizontal well in an ultra-low permeability sandstone reservoir.To solve this problem,this study proposes to use packers,sealing cannula and other tools in the same horizontal well to inject water in some fractures and produce oil from other fractures.This new energy supplement method forms a segmental synchronous injection-production system in a horizontal well.The method can reduce the distance between the injection end and the production end,and quickly establish an effective displacement system.Changing the displacement between wells to displacement between horizontal well sections,and point water flooding to linear uniform water flooding,the method can enhance water sweeping volume and shorten waterflooding response period.The research shows that:(1)In the synchronous injection and production of horizontal well in an ultra-low-permeability sandstone reservoir,the water injection section should select the section where the natural fractures and artificial fractures are in the same direction or the section with no natural fractures,and the space between two sections should be 60?80 m.(2)In addition to controlling injection pressure,periodic water injection can be taken to reduce the risk of re-opening and growth of natural fractures or formation fracture caused by the gradual increase of water injection pressure with water injection going on.(3)Field tests have verified that this method can effectively improve the output of single well and achieve good economic benefits,so it can be widely used in the development of ultra-low permeability sandstone reservoirs.
文摘针对新能源汽车控制器开发周期长、无法快速进行小批量生产等问题,该文应用基于模型的快速开发方法进行永磁同步电机控制算法开发。文中先分析了永磁同步电机的数学模型,在此基础上设计了速度环的ADRC算法;然后在D2P(development to production)平台下,搭建车用永磁同步电机矢量控制代码模型,以及代码自动生成和仿真验证;最后进行台架试验,验证控制算法,在线整定参数,实现控制算法的快速开发。实验结果表明,采用基于模型的快速开发方法能够缩短开发周期和成本,并且自动生成的代码具有较高的可靠性,能满足新能源汽车各项性能要求。
