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     The chromosome number and karyotype of meristematic cells of the root tips. of Tamarindus indica are observed and analysed. The karyotype formula is 2n=24=20m+4sm.
     据观察分析,酸角根尖细胞的染色体数目和核型:2n=24=20m+4sm.
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     Serious complications of the microvascular decompression in cerebellopontine angle
     桥小脑神经减压术的并发症
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     A New Type of Angle Acceleration Sensor
     加速度传感器
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     It is the dried root of plant Ficus hirtaVahI.
     的干燥
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Relation of the rice cultivars,cultivation factors and elongating angle of root with the corresponding influence on the yield was studied by using cylinder to get root and then using formula established by Shigenori Morita.Among three elongating angles of the root(<30°,30—50°,>50°),the ratio of slanting elongation root numbers to the total root numbers of single plant was as follows:①Shanyou 63 is the highest,Nihobare is the lowest;Among the density treatments,two plants per hill are the highest,six plants per...

Relation of the rice cultivars,cultivation factors and elongating angle of root with the corresponding influence on the yield was studied by using cylinder to get root and then using formula established by Shigenori Morita.Among three elongating angles of the root(<30°,30—50°,>50°),the ratio of slanting elongation root numbers to the total root numbers of single plant was as follows:①Shanyou 63 is the highest,Nihobare is the lowest;Among the density treatments,two plants per hill are the highest,six plants per hill are the lowest;②In the research of elongation stage,the ratio of the free growth tillering area is the highest and the ratio of the controlled tillering area is the lowest;in the research of heading stage,the ratio obviously increased when the free growth tillering area was changed into the controlled tillering area at the elongation stage,but after shading the root growth was greatly hindered;③The plot yield of Shanyou 63 is the highest,while that of Nihobare is the lowest.The result was related to the root numbers of single plant,the slanting growh root number and the ratio of the two.More panicle numbers in the area of six plants per hill resulted in the highest yield among all the density treatments.

采用圆筒取土器取根,再根据森田茂纪建立的计算公式,研究了水稻品种类型和栽培因素与根的伸长方向角的关系及其对产量的影响。三种伸长方向角根(<30°、30~50°、>50°)中,30~50°和>50°的斜向伸展根数占单株根数的比值结果为:1.品种间以汕优63最多,日本晴较少;密度区以每穴双株区最多,6株区最少。2.拔节期调查,以分蘖自由发展区最多,控蘖区较少;抽穗期调查,控蘖区在拔节期改成分蘖自由发展后均显著增加,而进行遮光处理后,根系发展显著受到抑制。3.小区产量以汕优63最高,日本晴较低,其结果与单株根数和斜向伸展根数以及占单株根数的比值均高有关,密度间以每穴6株区最高,是穗数较多所致。

The aerodynamic characteristics of the cuted tip rhombus wing and double-delta wing of middling sweepback angle and aspect ratio about sixty type are investigated by a numerical method based on Eular equations.The high speed wind tunnel tests of selected sixteen cuted tip rhombus wing and fourteen double-delt wing are performed,in order to study the effects of wing plane parameters(leading edge sweepback angle,aspect ratio,taper ratio and geometric twist) on longitudinal aerodynamic characteristics.The curves...

The aerodynamic characteristics of the cuted tip rhombus wing and double-delta wing of middling sweepback angle and aspect ratio about sixty type are investigated by a numerical method based on Eular equations.The high speed wind tunnel tests of selected sixteen cuted tip rhombus wing and fourteen double-delt wing are performed,in order to study the effects of wing plane parameters(leading edge sweepback angle,aspect ratio,taper ratio and geometric twist) on longitudinal aerodynamic characteristics.The curves of test and empirical formula for quantitative estimate longitudinal aerodynamic characteristics of this two kind wings are introduced.Researched results of this paper provide practical data and design references for constituded data-base of wing aerodynamical desing and aircraft aerodyanamical configuration research.

采用Euler数值计算方法,对60多种中等后掠角及展弦比的切尖菱形机翼、双三角机翼纵向气动力特性进行了计算、分析和比较,从中筛选出16种切尖菱形机翼、14种双三角机翼进行了全机高速风洞实验研究,给出了机翼的展弦比、前缘后掠角、根梢比(后缘前掠角)及几何扭转变化对全机升力、阻力及俯仰力矩的影响曲线和数据分析,在此基础上提出了用于定量估算两类机翼纵向气动力特性的关系式及修正因子。本文研究结果为建立战斗机机翼气动力设计数据库及飞机气动布局设计提供了实用的数据和设计参考。

 
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