为了量化作物群体质量,和准确科学计算光合有效辐射(photosynthetical active radiation,PAR)空间分布,该文利用空间统计学理论和方法,以不同棉花群体为研究对象,研究了不同群体PAR的空间分布特征。结果表明:在棉花生长初期,PAR空间变...为了量化作物群体质量,和准确科学计算光合有效辐射(photosynthetical active radiation,PAR)空间分布,该文利用空间统计学理论和方法,以不同棉花群体为研究对象,研究了不同群体PAR的空间分布特征。结果表明:在棉花生长初期,PAR空间变化具有中度空间相关性,中后期,群体PAR空间变化具有高度空间相关性;在棉花生长初期,透光率呈深"V"字形,向两侧边逐渐减小,到了棉花生长中后期封行后,中上部呈浅"V"形,中下部基本呈线性递减;6个棉花群体生育期平均透射光率呈现二次方程曲线变化趋势,从整个生育期PAR截获率看,PAR截获率随密度增加,群体棉花生物量逐渐增加,但增速减小,而经济学产量到69000万株/hm2时开始下降。该文为标准化生产管理提供依据。展开更多
A portable spectrophotometer developed by Changchun R & D Center for Analytical Instruments, which combines ΔI measurement mode and a measurement mode together with a high sensitivity, good accuracy and low cost,...A portable spectrophotometer developed by Changchun R & D Center for Analytical Instruments, which combines ΔI measurement mode and a measurement mode together with a high sensitivity, good accuracy and low cost, is employed to replace the traditional spectrophotometer and the sensitivity is enhanced. Therefore, a new rapid method with low cost and simplicity in operation for protein determination is developed. For this method, the linear range is shown to be 0—0 74 μg/mL, the detection limit is 0 01 μg/mL, and the analysis can be completed within 5 min. The albumin in urine is determined and all the results are confirmed by the standard method. Because of the rapid analysis speed, less expenditure, more convenience and simplicity in operation of this method, it is possible to use this method to diagnose glycosuric nephropathy at an early stage, even do it at home.展开更多
文摘为了量化作物群体质量,和准确科学计算光合有效辐射(photosynthetical active radiation,PAR)空间分布,该文利用空间统计学理论和方法,以不同棉花群体为研究对象,研究了不同群体PAR的空间分布特征。结果表明:在棉花生长初期,PAR空间变化具有中度空间相关性,中后期,群体PAR空间变化具有高度空间相关性;在棉花生长初期,透光率呈深"V"字形,向两侧边逐渐减小,到了棉花生长中后期封行后,中上部呈浅"V"形,中下部基本呈线性递减;6个棉花群体生育期平均透射光率呈现二次方程曲线变化趋势,从整个生育期PAR截获率看,PAR截获率随密度增加,群体棉花生物量逐渐增加,但增速减小,而经济学产量到69000万株/hm2时开始下降。该文为标准化生产管理提供依据。
文摘A portable spectrophotometer developed by Changchun R & D Center for Analytical Instruments, which combines ΔI measurement mode and a measurement mode together with a high sensitivity, good accuracy and low cost, is employed to replace the traditional spectrophotometer and the sensitivity is enhanced. Therefore, a new rapid method with low cost and simplicity in operation for protein determination is developed. For this method, the linear range is shown to be 0—0 74 μg/mL, the detection limit is 0 01 μg/mL, and the analysis can be completed within 5 min. The albumin in urine is determined and all the results are confirmed by the standard method. Because of the rapid analysis speed, less expenditure, more convenience and simplicity in operation of this method, it is possible to use this method to diagnose glycosuric nephropathy at an early stage, even do it at home.
