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Under controlled conditions in artificial bioclimatic chambers, adult aphids of red and green biotypes of Sitobion avenae were placed on two wheat varieties ('Astron' and 'Xiaoyan-22') and treated under 30W lamp of UV\|B for different durations respectively.

研究紫外辐射对红和绿体色型麦长管蚜的生物学特征的影响,探求紫外辐射在蚜虫种下体色分化及遗传中的作用。

Considering the shielding effects of carbonous layer forming on the burning surface on the transmission of external irradiation, the burning characteristics of 1040, 1041, N -5 and N propellants were analyzed.

考虑到辐射在燃烧表面上形成的碳化层对辐射传递的阻碍作用,本文分析了1040,1041,N-5和N型推进剂的燃烧特性。

When the ratio of starch to sodium chloroacetate is 1:1, the optimal reaction conditions were: microwave radiation time 30 min, addition of 12 mL 96% isopropyl alcohol, CMS with DS 0.7 and solution viscosity of 10000~20000 mPa.s was produced, and better appearance was presented compared with that by dry method.

使用微波辐射作为反应的加热方式,考察了微波辐射时间、碱、溶剂等条件对微波法制备羧甲基淀粉产品取代度和黏度的影响,并最终确定了在微波照射时间为30min,加入96%异丙醇条件下制备出取代度达0.7,黏度在10000~20000mPa.s的产品。

A kind of acoustic phased arc array with circumferentially controlled directivity presented in this paper can be used to make acoustic logging with circumferential azimuth detection function.

为了实现声波测井的周向分辨能力,提出了可应用于声波测井的、具有周向辐射指向性的相控圆弧阵声波辐射器方案。

The radiation energy of the compressional and shear waves is greater in soft formation than in hard formation.

经向应力源辐射能量的95%在井内以管波形式传播(200Hz),随着频率的增高,辐射进入地层的能量有明显增加。

It is concluded that intersystem crossing to produce the localized triplet state is an important pathway of intramolecular exciplex deactivation besides radiative and nonradiative decay to the ground state.

发现形成的激基复合物除了通过辐射和非辐射衰变回到基态外,通过系间穿越形成蒽的激发三重态是淬灭激基复合物的另一个重要途径。

Since irradiated meat, poultry and seafood still have a "fresh" appearance, irradiation could be an important treatment to render raw foods of animal origin microbiologically safe.

由于辐射处理过的肉、禽和海产食品仍具有&新鲜&的外观,因此,辐射是提高动物源食品原料微生物安全性的重要方法。

Based on the simulated multispectral and multiangular satellite measurements, we analyzed the sensitivity of different wavelength and satellite view.angle to the retrieval of the aerosol optical thickness and effective radius.

2利用Mie散射和大气辐射传输模式模拟了一个给定条件下的卫星多视角、多波长的辐射观测,分析了各通道之间可用于气溶胶光学厚度和粒子有效半径反演的敏感性。

They are compound nucleus statistical process and two nonstatistical process ,i.

所考虑的反应机制有复合核统计过程和复合核弹性散射道中的辐射俘获及形状弹性散射道中的直接-半直接辐射俘获两种非统计过程。

In this study, we investigated the protective effects of NaHSO3 on the physiological and biochemical processes of Phaseolus vulgaris leaves under enhanced UV-B radiation.

为了减轻UV-B辐射对植物叶片的伤害,本研究以离体红芸豆叶片为实验材料,通过外源施加NaHSO3的方法探讨了UV-B辐射下NaHSO3 对离体红芸豆叶片的保护作用。

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The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应,而且减少跟风的可能性。

The new PS20 solar power tower collected sunlight through mirrors known as "heliostats" to produce steam that is converted into electricity by a turbine in Sanlucar la Mayor, Spain, Wednesday.

聚光:照片上是建在西班牙桑路卡拉马尤城的一座新型PS20塔式太阳能电站。被称为&日光反射装置&的镜子将太阳光反射到主塔,然后用聚集的热量产生蒸汽进而通过涡轮机转化为电力