15000台以上的 PAT 喷气投梭机构在为数众多的织造工厂内投入工业化运转。重复的指令证明它显著地适合于今日织造工艺的要求。正在进行的研究目标在于高性能、增加效率,更柔软的织物和较少的维修,以获得更有竞争力的织造成本。用 PAT-A...15000台以上的 PAT 喷气投梭机构在为数众多的织造工厂内投入工业化运转。重复的指令证明它显著地适合于今日织造工艺的要求。正在进行的研究目标在于高性能、增加效率,更柔软的织物和较少的维修,以获得更有竞争力的织造成本。用 PAT-A 喷气投纬器的劳动布喷气织机,它的设计非常紧凑。展开更多
为简化多层机织物的工艺设计,研发了多层机织物组织CAD。详细阐述了该系统的特点、数学模型,并以蜂巢组织为实例进行了说明。该系统采用Barland C++ Builder5.0语言编程,用开口图表示多层织物组织,并提出顺逆序投纬模式,适用于任意层数...为简化多层机织物的工艺设计,研发了多层机织物组织CAD。详细阐述了该系统的特点、数学模型,并以蜂巢组织为实例进行了说明。该系统采用Barland C++ Builder5.0语言编程,用开口图表示多层织物组织,并提出顺逆序投纬模式,适用于任意层数的机织物设计,能自动生成穿综图及纹板图。展开更多
Interferometry plays an important role in revealing fine-scale structures of ionospheric irregularity.By placing an additional receiving array of four 5-element Yagi antennas in the north of the main East-West array o...Interferometry plays an important role in revealing fine-scale structures of ionospheric irregularity.By placing an additional receiving array of four 5-element Yagi antennas in the north of the main East-West array of the Sanya VHF radar,multiple interferometry baselines with components parallel and perpendicular to the magnetic meridian are formed.These baselines allow us to study the three-dimensional(3D)behavior of low-latitude ionospheric field-aligned irregularity(FAI)over Sanya.Using multiple non-collinear receiving baselines,an experiment for which the Sanya VHF radar operated as an interferometer was performed on 10 July 2013.Ionospheric E-region FAI echoes with periods of several minutes were observed during 0745-0915 UT;mean Doppler velocity was around -30 m/s with spectral widths of about 50 m/s.The interferometry results show fine-scale structures of E-region FAI with a zonal scale size of 15 km or less.In addition,we found that the periodic variations of echo intensity shown in radar range-time-intensity(RTI)maps were produced by spatially separated E-region irregularity patches.The patches drifted westward with a velocity of about 40-60 m/s and could be associated with propagating gravity waves.These results provide a clearer picture of the characteristics of FAI and thus help to investigate the generation and dynamics of low-latitude ionospheric irregularities in the Chinese sector.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.41374163,41374164,41174136,41204113,41127003,and 41321003)Chinese Academy of Sciences(Grant Nos.KZCX2-YW-Y10,KZZD-EW-01-3)the National Important Basic Research Project of China(Grant No.2011CB811405)
文摘Interferometry plays an important role in revealing fine-scale structures of ionospheric irregularity.By placing an additional receiving array of four 5-element Yagi antennas in the north of the main East-West array of the Sanya VHF radar,multiple interferometry baselines with components parallel and perpendicular to the magnetic meridian are formed.These baselines allow us to study the three-dimensional(3D)behavior of low-latitude ionospheric field-aligned irregularity(FAI)over Sanya.Using multiple non-collinear receiving baselines,an experiment for which the Sanya VHF radar operated as an interferometer was performed on 10 July 2013.Ionospheric E-region FAI echoes with periods of several minutes were observed during 0745-0915 UT;mean Doppler velocity was around -30 m/s with spectral widths of about 50 m/s.The interferometry results show fine-scale structures of E-region FAI with a zonal scale size of 15 km or less.In addition,we found that the periodic variations of echo intensity shown in radar range-time-intensity(RTI)maps were produced by spatially separated E-region irregularity patches.The patches drifted westward with a velocity of about 40-60 m/s and could be associated with propagating gravity waves.These results provide a clearer picture of the characteristics of FAI and thus help to investigate the generation and dynamics of low-latitude ionospheric irregularities in the Chinese sector.
