Five rice varieties were planted to determine the variation of the yield and quality traits in five different regions in a cold area of China. The results showed that the number of the panicles, the number of grains p...Five rice varieties were planted to determine the variation of the yield and quality traits in five different regions in a cold area of China. The results showed that the number of the panicles, the number of grains per panicle and percentage of head-milled rice displayed quadratic curves against the accumulated temperature, and the sterile rate decreased with greater accumulated temperature. However, 1 000-grain weight had no correlation with the accumulated temperature and protein content, amylose content and taste also had no obvious relation with the accumulated temperature. The results from the accumulated temperature differed with rice variety, so the temperature insensitive type variety should be proposed for production.展开更多
随着高工作温度红外光电子器件的发展,更高的工作温度下,冷屏部件的热辐射会带来背景辐射噪声,对红外探测器的成像造成干扰。为研究高温器件冷屏部件热辐射对芯片性能的影响,基于蒙特卡洛原理,采用3D Studio Max建立冷屏模型,提取模型...随着高工作温度红外光电子器件的发展,更高的工作温度下,冷屏部件的热辐射会带来背景辐射噪声,对红外探测器的成像造成干扰。为研究高温器件冷屏部件热辐射对芯片性能的影响,基于蒙特卡洛原理,采用3D Studio Max建立冷屏模型,提取模型信息编写程序,计算冷屏部件各部分对芯片的辐射传递因子,进而得到冷屏部件热辐射在芯片上产生的噪声信号。在给定的参数和条件下,对某高温器件冷屏进行计算分析,表明该高温器件冷屏部件的温度需低于196 K。为抑制高温器件冷屏部件的热辐射,研究了整体降低冷屏发射率和局部降低冷屏发射率这两种方案。整体降低冷屏发射率可降低冷屏自身热辐射产生的噪声信号,但会造成外部辐射中经冷屏反射间接到达芯片的杂散辐射噪声信号迅速增加。局部降低冷屏发射率可降低冷屏自身热辐射产生的噪声信号并使外部辐射中经冷屏反射间接到达芯片的杂散辐射噪声信号缓慢增加。采用局部降低冷屏发射率的方案,对总的杂散辐射的抑制效果与温度有关,当冷屏部件温度小于203 K时,会引起总的杂散辐射噪声信号增加;当冷屏部件温度大于203 K时,可以降低总的杂散辐射噪声信号。展开更多
海平面下降和海底温度上升可以引起海底水合物分解,进而导致天然气水合物稳定带底界处沉积物孔隙形成超压,一旦超压积聚突破地层有效应力,就会在海底产生甲烷渗漏。本文通过建立与此相关的稳定带底界变化的数值模型,以分析南海北部东沙...海平面下降和海底温度上升可以引起海底水合物分解,进而导致天然气水合物稳定带底界处沉积物孔隙形成超压,一旦超压积聚突破地层有效应力,就会在海底产生甲烷渗漏。本文通过建立与此相关的稳定带底界变化的数值模型,以分析南海北部东沙海域GMGS2-16水合物钻探站位25 ka BP以来稳定带底界的动态变化。结果显示,在海平面上升的大背景下,海底温度的波动是稳定带底界动态变化的主要因素,主导了水合物生成和分解的周期性变化。底水温度升高导致稳定带底界上移,水合物分解,造成大量甲烷气体的释放,然而这种响应呈现一定的滞后,大约滞后1~3 ka。此外,水合物钻探获取的相应层位沉积物中出现了Mo元素富集的现象,表明稳定带底界上升及水合物分解形成的气体超压可以形成海底冷泉活动。因此,天然气水合物分解可能是冷泉渗漏活动的驱动机制。展开更多
基金Supported by the Public Industry Project of Ministry of Agriculture(201303126)Postdoctoral Fund of Heilongjiang Province(LBH-Z13189)Innovation Project of Institute(2012ZD013)
文摘Five rice varieties were planted to determine the variation of the yield and quality traits in five different regions in a cold area of China. The results showed that the number of the panicles, the number of grains per panicle and percentage of head-milled rice displayed quadratic curves against the accumulated temperature, and the sterile rate decreased with greater accumulated temperature. However, 1 000-grain weight had no correlation with the accumulated temperature and protein content, amylose content and taste also had no obvious relation with the accumulated temperature. The results from the accumulated temperature differed with rice variety, so the temperature insensitive type variety should be proposed for production.
文摘海平面下降和海底温度上升可以引起海底水合物分解,进而导致天然气水合物稳定带底界处沉积物孔隙形成超压,一旦超压积聚突破地层有效应力,就会在海底产生甲烷渗漏。本文通过建立与此相关的稳定带底界变化的数值模型,以分析南海北部东沙海域GMGS2-16水合物钻探站位25 ka BP以来稳定带底界的动态变化。结果显示,在海平面上升的大背景下,海底温度的波动是稳定带底界动态变化的主要因素,主导了水合物生成和分解的周期性变化。底水温度升高导致稳定带底界上移,水合物分解,造成大量甲烷气体的释放,然而这种响应呈现一定的滞后,大约滞后1~3 ka。此外,水合物钻探获取的相应层位沉积物中出现了Mo元素富集的现象,表明稳定带底界上升及水合物分解形成的气体超压可以形成海底冷泉活动。因此,天然气水合物分解可能是冷泉渗漏活动的驱动机制。
