The black inch worm, Hyposidra talaca （Walker） （Geometridae： Lepidoptera） has earned considerable importance as a defoliator during last decade in north east India. Characteristic features of H. talaca, Such as s...The black inch worm, Hyposidra talaca （Walker） （Geometridae： Lepidoptera） has earned considerable importance as a defoliator during last decade in north east India. Characteristic features of H. talaca, Such as switching from wild plants to Camellia sinensis, and completion of 6-8 generations in a year without winter diapause appear to be the major reasons for persistence of the defoliator on C. sinensis. There are reports on the aggressive infestation of the pest on C. sinensis than on alternate host plants and development of high tolerance^resistance to certain insecticides. Till date, more than one hundred alternate host plants have been recorded for H. talaca, but with very few natural enemies. To manage this pest chemically, synthetic pesticides are widely used. Integrated management is recently being encouraged wherein cultural, mechanical, physical, biological and chemical methods have been contemplated. This review collates the work and literature on the ecology of H. talaca and offers an analysis of the problems encountered in managing the defoliator in tea plantations. Further, future directions for better management of H. talaca are suggested.展开更多
碳化硅(SiC)的硬脆特性导致传统线锯切割存在效率低、损耗大、无法实现大尺寸加工等难题,严重制约了12 inch衬底技术及相关产业的发展。新型激光切片技术采用超快激光在SiC晶体内部聚焦实现非接触式切割,提供了全新的解决方案;但是,12 i...碳化硅(SiC)的硬脆特性导致传统线锯切割存在效率低、损耗大、无法实现大尺寸加工等难题,严重制约了12 inch衬底技术及相关产业的发展。新型激光切片技术采用超快激光在SiC晶体内部聚焦实现非接触式切割,提供了全新的解决方案;但是,12 inch SiC晶体存在应力大、翘曲大、缺陷多等问题,导致激光切片难度很高。针对12 inch 4H-SiC晶体,本团队采用激光焦点实时修正、深度球差补偿等关键技术,结合皮秒激光加工与超声剥离,获得了厚度为680μm的12 inch 4H-SiC晶片。测试结果表明,切割后晶片的总厚度偏差(TTV)小于10μm,翘曲度为-14.07μm,表面粗糙度在3.25μm到3.93μm之间,首次实现了12 inch SiC晶体的高质量均匀切片。展开更多
The neutrino detector for the Jiangmen Underground Neutrino Observatory（JUNO） requires a large number of photomultiplier tubes（PMTs）, including 15000 MCP PMTs and 5000 dynode PMTs. The TTS（transit time spread） o...The neutrino detector for the Jiangmen Underground Neutrino Observatory（JUNO） requires a large number of photomultiplier tubes（PMTs）, including 15000 MCP PMTs and 5000 dynode PMTs. The TTS（transit time spread） of the PMTs is very important for vertex and track reconstruction of the neutrinos in the detector. In this paper, we study the TTS of a 20-inch dynode PMT（R12860） from Hamamatsu for different high voltage, light intensity, light spot size and different photocathode regions. The impact from Earth＇s magnetic field is also studied.The results achieved in this paper will be very useful for the JUNO experiment.展开更多
工业金属引领者九寸钉(Nine Inch Nails)时隔两年又给我们奉献上一张全新的唱片,十六首和谐紧凑的歌曲来得绝对过瘾,曾经用"Love is Not Enough"、"Hurt"、"All The Love In The World"等等歌曲感动... 工业金属引领者九寸钉(Nine Inch Nails)时隔两年又给我们奉献上一张全新的唱片,十六首和谐紧凑的歌曲来得绝对过瘾,曾经用"Love is Not Enough"、"Hurt"、"All The Love In The World"等等歌曲感动过我的Trent Renzor,今次的这张专辑,更像是温柔的延续、冲撞的深入.……展开更多
Sales at U.S. retailers rose more strongly than expected in March offering hope the recovery of Chinese textile and apparel export sector would continue.Despite signs the recovery from the worst downturn since the Gre...Sales at U.S. retailers rose more strongly than expected in March offering hope the recovery of Chinese textile and apparel export sector would continue.Despite signs the recovery from the worst downturn since the Great Depression may be gaining momentum,we highlight the necessity for Chinese textile businesses to keep a watchful eye on restraints.展开更多
基金The authors extend their gratitude to the National Tea Research Foundation (NTRF), Tea Board, Government of India for extending their support on integrated management of Hyposidra talaca in tea plantations in project mode.
文摘The black inch worm, Hyposidra talaca （Walker） （Geometridae： Lepidoptera） has earned considerable importance as a defoliator during last decade in north east India. Characteristic features of H. talaca, Such as switching from wild plants to Camellia sinensis, and completion of 6-8 generations in a year without winter diapause appear to be the major reasons for persistence of the defoliator on C. sinensis. There are reports on the aggressive infestation of the pest on C. sinensis than on alternate host plants and development of high tolerance^resistance to certain insecticides. Till date, more than one hundred alternate host plants have been recorded for H. talaca, but with very few natural enemies. To manage this pest chemically, synthetic pesticides are widely used. Integrated management is recently being encouraged wherein cultural, mechanical, physical, biological and chemical methods have been contemplated. This review collates the work and literature on the ecology of H. talaca and offers an analysis of the problems encountered in managing the defoliator in tea plantations. Further, future directions for better management of H. talaca are suggested.
文摘碳化硅(SiC)的硬脆特性导致传统线锯切割存在效率低、损耗大、无法实现大尺寸加工等难题,严重制约了12 inch衬底技术及相关产业的发展。新型激光切片技术采用超快激光在SiC晶体内部聚焦实现非接触式切割,提供了全新的解决方案;但是,12 inch SiC晶体存在应力大、翘曲大、缺陷多等问题,导致激光切片难度很高。针对12 inch 4H-SiC晶体,本团队采用激光焦点实时修正、深度球差补偿等关键技术,结合皮秒激光加工与超声剥离,获得了厚度为680μm的12 inch 4H-SiC晶片。测试结果表明,切割后晶片的总厚度偏差(TTV)小于10μm,翘曲度为-14.07μm,表面粗糙度在3.25μm到3.93μm之间,首次实现了12 inch SiC晶体的高质量均匀切片。
基金Supported by Strategic Priority Research Program of the Chinese Academy of Sciences(XDA10011100)National Natural Science Foundation of China(U1431109,11265003)
文摘The neutrino detector for the Jiangmen Underground Neutrino Observatory（JUNO） requires a large number of photomultiplier tubes（PMTs）, including 15000 MCP PMTs and 5000 dynode PMTs. The TTS（transit time spread） of the PMTs is very important for vertex and track reconstruction of the neutrinos in the detector. In this paper, we study the TTS of a 20-inch dynode PMT（R12860） from Hamamatsu for different high voltage, light intensity, light spot size and different photocathode regions. The impact from Earth＇s magnetic field is also studied.The results achieved in this paper will be very useful for the JUNO experiment.
文摘 工业金属引领者九寸钉(Nine Inch Nails)时隔两年又给我们奉献上一张全新的唱片,十六首和谐紧凑的歌曲来得绝对过瘾,曾经用"Love is Not Enough"、"Hurt"、"All The Love In The World"等等歌曲感动过我的Trent Renzor,今次的这张专辑,更像是温柔的延续、冲撞的深入.……
文摘Sales at U.S. retailers rose more strongly than expected in March offering hope the recovery of Chinese textile and apparel export sector would continue.Despite signs the recovery from the worst downturn since the Great Depression may be gaining momentum,we highlight the necessity for Chinese textile businesses to keep a watchful eye on restraints.
