利用"陆地棉×中棉×瑟伯氏棉"HAT三元远缘杂种后代深厚遗传背景,通过低代混选法,提高棉花远缘杂交后代的遗传改良效果;采用优系内姊妹交,充分利用数量性状基因的加性效应,促进产量、抗性、品质等数量性状微效多基因...利用"陆地棉×中棉×瑟伯氏棉"HAT三元远缘杂种后代深厚遗传背景,通过低代混选法,提高棉花远缘杂交后代的遗传改良效果;采用优系内姊妹交,充分利用数量性状基因的加性效应,促进产量、抗性、品质等数量性状微效多基因聚合;现代分子标记技术与传统高效育种技术相结合,缩短育种进程;培育出转基因抗虫棉花新品种冀1316。该品种遗传基础丰富,具有陆地棉、中棉和野生瑟伯氏棉血统,集高产、稳产、优质、广适、多抗、适于简化管理等优良性状于一体。冀中南棉花品种区域试验,冀1316的23个试验点全部增产,且增幅达到极显著水平,皮棉产量、霜前皮棉产量分别较对照DP99B增产20.5%和23.8%,均居同期参试品种第1名;高抗棉铃虫,抗盲蝽象;抗旱,耐盐碱;纤维上半部平均长度30.2 mm,马克隆值5.0,断裂比强度30.4 c N/tex,为纤维优质Ⅱ型品种;尤其是在稳产性、抗逆、抗盲蝽象、适于机械化轻简化管理方面优势明显,能够满足河北省及其周边棉区生产需求和目前棉花生产对棉花品种机械化轻简化管理的需要。展开更多
本文介绍的3MK1316型数控轴承内圈沟磨床是我国第一台带 CRT 屏幕显示的高效数控轴承磨床。该机床采用60 m/s 高速磨削,结构特点为:主轴支承采用四片对称轴瓦的动压轴承;由步进电机—谐波减速器,滚珠丝杠螺母组成的微进给机构;导轨为高...本文介绍的3MK1316型数控轴承内圈沟磨床是我国第一台带 CRT 屏幕显示的高效数控轴承磨床。该机床采用60 m/s 高速磨削,结构特点为:主轴支承采用四片对称轴瓦的动压轴承;由步进电机—谐波减速器,滚珠丝杠螺母组成的微进给机构;导轨为高刚度的双“V”型滚针导轨;单臂强迫式自动上下料机构等新技术、新结构,数控系统使整机调整操作方便,动作稳定可靠。生产率较现有指标有较大提高;加工精度好,沟道圆度可达1μm,接近和达到国外同类型机床水平。本文着重论述该机床优化砂轮主轴及微量进给等结构,及其获得高效率、高精度的方法。展开更多
We present multi-wavelength imagery of the merger remnant galaxy NGC 1316 with an objective to study the dust content and its association with the other phases of the interstellar medium. Color-index maps as well as e...We present multi-wavelength imagery of the merger remnant galaxy NGC 1316 with an objective to study the dust content and its association with the other phases of the interstellar medium. Color-index maps as well as extinction maps derived for this galaxy reveal an intricate and complex dust morphology in NGC 1316, i.e. there is a prominent lane in the inner part, while at about 6-7 kpc it apparently takes the form of an arc-like pattern extending along the northeast direction. In addition to this, several other dust clumps and knots are also evident in this galaxy. The dust emission mapped using Spitzer data at 8 μm indicates even more complex morphological structures of the dust in NGC 1316. The extinction curve derived over the optical to near-IR bands closely follows the standard Galactic curve, suggesting similar properties of the dust grains. The dust content of NGC 1316, estimated from optical extinction, is ,- 2.13 × 10^5 M⊙. This is a lower limit compared to that estimated using the IRAS flux densities of ,-5.17× 10^6 M⊙ and the flux densities at 24, 70 and 160 p.m from MIPS ,-3.2× 10^7 M⊙. High resolution Chandra observations of this merger remnant system have provided an unprecedented view of the complex nature exhibited by the distribution of hot gas in NGC 1316, which closely matches the morphology of ionized gas and to some extent also the dust. X-ray color-color plots for the resolved sources within the optical D25 extent of NGC 1316 have enabled us to separate them into different classes.展开更多
六氟-2-丁烯(HFC-1336)ODP值为零,GWP值很低(GWP100 yr ITH=9.4(NOAA)),是发泡剂HCFC-141b的理想替代品之一。对其合成方法进行了文献综述,在文献基础上得出以六氟-2,3-二氯-2-丁烯(R1316)为原料经两步反应合成HFC-1336的工艺具有工业...六氟-2-丁烯(HFC-1336)ODP值为零,GWP值很低(GWP100 yr ITH=9.4(NOAA)),是发泡剂HCFC-141b的理想替代品之一。对其合成方法进行了文献综述,在文献基础上得出以六氟-2,3-二氯-2-丁烯(R1316)为原料经两步反应合成HFC-1336的工艺具有工业化应用前景。展开更多
文摘利用"陆地棉×中棉×瑟伯氏棉"HAT三元远缘杂种后代深厚遗传背景,通过低代混选法,提高棉花远缘杂交后代的遗传改良效果;采用优系内姊妹交,充分利用数量性状基因的加性效应,促进产量、抗性、品质等数量性状微效多基因聚合;现代分子标记技术与传统高效育种技术相结合,缩短育种进程;培育出转基因抗虫棉花新品种冀1316。该品种遗传基础丰富,具有陆地棉、中棉和野生瑟伯氏棉血统,集高产、稳产、优质、广适、多抗、适于简化管理等优良性状于一体。冀中南棉花品种区域试验,冀1316的23个试验点全部增产,且增幅达到极显著水平,皮棉产量、霜前皮棉产量分别较对照DP99B增产20.5%和23.8%,均居同期参试品种第1名;高抗棉铃虫,抗盲蝽象;抗旱,耐盐碱;纤维上半部平均长度30.2 mm,马克隆值5.0,断裂比强度30.4 c N/tex,为纤维优质Ⅱ型品种;尤其是在稳产性、抗逆、抗盲蝽象、适于机械化轻简化管理方面优势明显,能够满足河北省及其周边棉区生产需求和目前棉花生产对棉花品种机械化轻简化管理的需要。
文摘本文介绍的3MK1316型数控轴承内圈沟磨床是我国第一台带 CRT 屏幕显示的高效数控轴承磨床。该机床采用60 m/s 高速磨削,结构特点为:主轴支承采用四片对称轴瓦的动压轴承;由步进电机—谐波减速器,滚珠丝杠螺母组成的微进给机构;导轨为高刚度的双“V”型滚针导轨;单臂强迫式自动上下料机构等新技术、新结构,数控系统使整机调整操作方便,动作稳定可靠。生产率较现有指标有较大提高;加工精度好,沟道圆度可达1μm,接近和达到国外同类型机床水平。本文着重论述该机床优化砂轮主轴及微量进给等结构,及其获得高效率、高精度的方法。
基金supported by UGC, New Delhi under the major research project F.No. (36-240/2008-SR)the use of the High Performance Computing Facility developed under the DST- FIST scheme sanction No. SR/FST/PSI-145
文摘We present multi-wavelength imagery of the merger remnant galaxy NGC 1316 with an objective to study the dust content and its association with the other phases of the interstellar medium. Color-index maps as well as extinction maps derived for this galaxy reveal an intricate and complex dust morphology in NGC 1316, i.e. there is a prominent lane in the inner part, while at about 6-7 kpc it apparently takes the form of an arc-like pattern extending along the northeast direction. In addition to this, several other dust clumps and knots are also evident in this galaxy. The dust emission mapped using Spitzer data at 8 μm indicates even more complex morphological structures of the dust in NGC 1316. The extinction curve derived over the optical to near-IR bands closely follows the standard Galactic curve, suggesting similar properties of the dust grains. The dust content of NGC 1316, estimated from optical extinction, is ,- 2.13 × 10^5 M⊙. This is a lower limit compared to that estimated using the IRAS flux densities of ,-5.17× 10^6 M⊙ and the flux densities at 24, 70 and 160 p.m from MIPS ,-3.2× 10^7 M⊙. High resolution Chandra observations of this merger remnant system have provided an unprecedented view of the complex nature exhibited by the distribution of hot gas in NGC 1316, which closely matches the morphology of ionized gas and to some extent also the dust. X-ray color-color plots for the resolved sources within the optical D25 extent of NGC 1316 have enabled us to separate them into different classes.
文摘六氟-2-丁烯(HFC-1336)ODP值为零,GWP值很低(GWP100 yr ITH=9.4(NOAA)),是发泡剂HCFC-141b的理想替代品之一。对其合成方法进行了文献综述,在文献基础上得出以六氟-2,3-二氯-2-丁烯(R1316)为原料经两步反应合成HFC-1336的工艺具有工业化应用前景。
