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雾滴密度    
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  droplets density
    Relationship Between the Efficacy of Wheat Aphids Control and the Omethoate Concentration, Droplets Density
    药液浓度、雾滴密度与氧乐果防治麦蚜的关系研究
短句来源
    The relationship between the efficacy of wheat aphids control and omethoate concentration and droplets density was very closed. Based on regression analysis, laboratory studies showed that LN 90 values were 336.1, 237.6, 208.8 and 115.3 cm -2 respectively, at the omethoate concentration of 1.0, 1.5, 2.0, 3.0 g·L -1 and droplets with 85 μm VMD.
    氧乐果药液浓度、雾滴密度与小麦蚜虫防治效果关系紧密 ,室内定量喷雾试验表明 :雾滴体积中径 (VMD)为 85μm,氧乐果药液浓度 1.0、1.5、2 .0、3.0 g· L-1条件下 ,蚜虫致死 90 %时雾滴覆盖密度 L N90 分别为 336 .1、2 37.6、2 0 8.8和 115.3cm-2 ;
短句来源
  droplets density
    Relationship Between the Efficacy of Wheat Aphids Control and the Omethoate Concentration, Droplets Density
    药液浓度、雾滴密度与氧乐果防治麦蚜的关系研究
短句来源
    The relationship between the efficacy of wheat aphids control and omethoate concentration and droplets density was very closed. Based on regression analysis, laboratory studies showed that LN 90 values were 336.1, 237.6, 208.8 and 115.3 cm -2 respectively, at the omethoate concentration of 1.0, 1.5, 2.0, 3.0 g·L -1 and droplets with 85 μm VMD.
    氧乐果药液浓度、雾滴密度与小麦蚜虫防治效果关系紧密 ,室内定量喷雾试验表明 :雾滴体积中径 (VMD)为 85μm,氧乐果药液浓度 1.0、1.5、2 .0、3.0 g· L-1条件下 ,蚜虫致死 90 %时雾滴覆盖密度 L N90 分别为 336 .1、2 37.6、2 0 8.8和 115.3cm-2 ;
短句来源
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  droplet density
The first cumulant and time evolution of the droplet density correlation function can be quantitatively calculated by assuming the existence of polydispersed fractal clusters formed by the microemulsion droplets due to attraction.
      
Furthermore, if the ions can enter the droplet, a first-order phase transition occurs upon increasing Bjerrum length, surface tension or droplet density, leading to a phase separation.
      
The films are mainly crystallized in the austenitic phase and they have a smooth surface with a low droplet density (0.01?μm-2).
      
The liquid phase is described in Lagrangian form by the overall continuity equation, which reduces to an equation for the droplet size, the equations of motion, the energy equation and a droplet density function transport equation.
      
The conservation equations of mass, momentum, solute, and enthalpy for both phases, and an additional transport equation for the droplet density, were solved.
      
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Observations about the distribution habits of the tea caterpillar were conducted in Nangzheng County of Shaanxi Province. The results showed that the larvae before 4th instar distributed regularly on the under surface of the leaves in the middle and lower part of the bilateral tea rows, and the vertical and horizontal movements of the larvae keep relatively stable within the mentioned area within about 20 days. A quick sdraying technique of lateral canopy surface treatment was thus designed for the caterpillar...

Observations about the distribution habits of the tea caterpillar were conducted in Nangzheng County of Shaanxi Province. The results showed that the larvae before 4th instar distributed regularly on the under surface of the leaves in the middle and lower part of the bilateral tea rows, and the vertical and horizontal movements of the larvae keep relatively stable within the mentioned area within about 20 days. A quick sdraying technique of lateral canopy surface treatment was thus designed for the caterpillar control. The spray cloud was introduced directly onto the limited mentioned area, instead of. the conventional whole plant spray. Application rates and deposition densities of spray droplets of 5 insecticides used were determined and the control efficacies reported. Only one fourth of the conventional application dosage of pesticide was enough for control by the application techniques here described, and the pesticide-contamination of bud-tea could be decreased obviously.

在茶毛虫(Euproctis pseudocospersa Strand)生态学研究中,观察到阶梯形茶园中的茶毛虫四龄前幼虫有规律地分布在茶丛两侧中下部叶片背面。在近20多天内,其垂直和水平活动范围相对稳定。以茶毛虫侧向分布规律为依据,设计了茶毛虫低位侧向快速喷药防治技术,改进了过去全丛喷雾为两侧中下部快速喷雾,并根据茶丛高度及幼虫龄期调节步速和喷幅,以提高防治效果。测定了5种杀虫剂不同剂量对茶毛虫及蜘蛛的影响和茶丛不同部位雾滴密度,建立了实施快速喷雾防治技术。可减少用药量约3/4;降低茶蓬面芽叶受药量;与常规方法防治效果相当,而工效提高约3倍。经3年小区试验和大面积推广示范,证明较经济有效,适于山区茶园应用。

The drift of droplets in spraying diluted 2,4-D butyl ester emulsion by Yun-5 aircraft mounted the GP-81 nozzle has been studied,and a mathematical model has also been set up in this paper. As results,the droplet drift distance is 340 meters for the water with the smaller volatility,and 700 meters for the 2,4-D butyl ester with the greater volatility ; the density and amount of droplets decrease rapidly but the diameter decreases smoothly with the distance downwind increasing;the weather conditions and spray...

The drift of droplets in spraying diluted 2,4-D butyl ester emulsion by Yun-5 aircraft mounted the GP-81 nozzle has been studied,and a mathematical model has also been set up in this paper. As results,the droplet drift distance is 340 meters for the water with the smaller volatility,and 700 meters for the 2,4-D butyl ester with the greater volatility ; the density and amount of droplets decrease rapidly but the diameter decreases smoothly with the distance downwind increasing;the weather conditions and spray liquid fomulations influence greatly the drift;the equation Y=b0+b1X+b2X2+b3X3 describles the relation between the droplet drift and the distance downwind well,and the coefficients in the model have a clear practical meaning. This paper also advances an effective buffer zone width in 2,4-D butyl ester aerial application.

通过田间试验研究,探索了装配GP—81喷头的运五型飞机喷洒2,4—D丁酯乳油稀释液的雾滴漂移状况,建立了有关数学模型。研究表明,较低蒸发度的水雾滴漂移距离为340m,较高挥发度的2,4—D丁酯漂移距离达700m;雾滴密度和沉降量随下风距离增加而减小较快,雾滴直径减小较慢;气象因子和喷液配方对雾滴漂移有重要影响;三次多项式方程Y=b_0+b_1X+b_2X~2+b_3X~3能很好地描述雾滴漂移与下风距离的关系,模型中的参数具有明确的实际意义,提出了喷洒2,4—D丁酯时的有效隔离带宽度。

Techniques for applying oil formulations of Beauveria bassiana based with afood oil were studied.Conidia lost their viability completely 72 h after being diluted in,No.0 diesel,and so the diesel must be used only as a tank diluent.With a hot frog sprayer(JIN- MA)(nozzle temperature>340℃),almost all conidia sprayed lost their viability.However,with a 3 WCD-5ULV-sprayer,the viability were not affected,and mean diameter ofdroplets was around 30μm.With 12 droplets/cm2 as the effective spraying density,effectivespray...

Techniques for applying oil formulations of Beauveria bassiana based with afood oil were studied.Conidia lost their viability completely 72 h after being diluted in,No.0 diesel,and so the diesel must be used only as a tank diluent.With a hot frog sprayer(JIN- MA)(nozzle temperature>340℃),almost all conidia sprayed lost their viability.However,with a 3 WCD-5ULV-sprayer,the viability were not affected,and mean diameter ofdroplets was around 30μm.With 12 droplets/cm2 as the effective spraying density,effectivespray width could reach 7 m under wind speed of 3 m/s.

试验证明以零号柴油作为白僵菌油剂应用的稀释剂,需随配随用,放置72h后孢子萌发率为0;用金马牌油雾机(喷口温度>340℃)喷雾后,油剂中孢子全部失活;而以3WCD-5型电动超低容量喷雾机配套使用时,孢子活力不受影响,喷出雾滴平均直径在30μm左右,若雾滴密度以12个/cm2为有效密度,在风速为3m/s下,有效喷幅可达7m。

 
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