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The expectation value of atom dipole moment is always zero, but the fluctuation of dipole moment is a constant and not zero during the atomic spontaneous emission.

在原子的自发辐射过程中,其偶极矩的期待值总是零,但偶极矩的涨落恒等于一个不为零的常量,因此原子的自发辐射是由真空起伏导致偶极矩的涨落引起的。

Three subjects about the sci-tech park construction, agriculture, entironment and technology were proposed. Some problems were pointed out, such as inaccurate localization, pool maneuverability, unscientific programming, pool drive power and incorrect relationship between the park and farmers. Furthermore, Pharisaism, without regard to economic benefits and vast government action are still serious problem existing.

提出了园区建设要突出农业、生态、科技三大主题,也指出目前园区中存在的问题,如规划定位不够准,可操作性不强;园区规划不够科学,园区的辐射带动作用不强,没有妥善处理好园区与农民的关系;存在形式主义,为园区而建园区,不讲经济效益,政府行为较重等。

Through analyzing those special radiometric variations in ScanSAR images, this paper has explored the approaches for scalloping compensation and beam band correction.

中文摘要在对ScanSAR特有辐射不均匀性进行分析的基础上,本文开展了方位向Scalloping校正和距离向条带不均匀性校正研究。

Results The UV-B treatment caused the declines of chlorophyll content, soluble protein content and water content of leaves, besides, dose-effect was existed. The decline of 30 μW/cm^2 treatment was bigger than that of 15 μW/cm^2 treatment. The influences of UV-B radiation on carotenoid content and anthocyanidin content were similar; the change trends were declined firstly then increased. The UV-B treatment with two doses restrained the electron transport of PSⅡ, particularly; the inhibitory effect was biggest after treated 2h, and then this effect was declined in 4, 6 and 8 h, so the dose-effect was existed. The UV-B radiation with two doses restricted photosynthetic rate and the inhibitory effect increased with the increase of treatment time. The high dose treatment caused huge damage to membrane system, while the result of low dose treatment was not obvious.

结果]UV-B处理导致叶绿素、可溶性蛋白含量以及含水量都降低,且存在剂量效应,30μW/平方公分处理的降幅大于15μW/平方公分;UV-B辐射处理对类胡萝卜素含量的影响与花青素相同,均表现为先下降后上升的趋势,2种剂量间差异不大;2种剂量的UV-B处理均抑制了PSⅡ的电子传递,尤其是处理2 h的抑制作用最大,4、6和8 h的抑制作用有所缓解,且存在剂量效应;2种剂量的UV-B辐射均抑制了叶片的光合速率,随着照射时间的延长抑制效应加大;高剂量UV-B处理对膜系统的损伤较大,低剂量UV-B处理结果不明显。

It uses signals that look like background noise, except to a receiver equipped with the right unscrambling code.

这使得人类发出的无线电信号看起来像是宇宙中的背景辐射,但对装有解码装置的接收装置除外(译者注释:这句活的意思是说装有解码装置的接收器能认出这种信号不是宇宙中的背景辐射)。

Till now, there has not three-dimensional computation of radiation in system with complex geometry and fulled of inhomegeneous, absorpting and emitting medium existed in our country also. The author carries on three-dimensional computation of radiation in vectored nozzle for the first time, which undoubtedly establishes certain basis in this field.

此前我们国内还没有对复杂形状的系统内,不均匀吸收-发射性气体介质的辐射场的三维数值计算,本文率先对矢量喷管的辐射场进行了三维数值计算,为该领域的研究奠定了一定的基础。

5Ns. The peak position of N band emission as well as the distinct emission region slightly moves towards the open end of the cylindrical cavity, and this does not happen to O band emission. Radiation transport efficiency of 6% is obtained for the φ400×1200um cylindrical cavity heated by x-ray source with radiation temperature of 118 eV.

从时间分辨的X光强度轴向空间分布来看,在较长时间(约1~1.5ns)内,O带X光在整个观测缝对应的轴向范围之内均有较大的辐射强度,在X光强度空间分布的变化过程中,其强度峰值的空间位置基本不变;而对N带X光,则只在较短时间(约0.5ns)内,在整个观测缝对应的轴向范围之内可观测到X光辐射,但只在靠近输运源约300μm的范围内有较强发射,在柱腔末端600~700μm范围之内的辐射则很弱,N带X光辐射轴向空间分布曲线的峰值位置在朝柱腔末端的方向移动,移动量大约为130~250μm。

Larches of different ages have different net photosynthetic rate: the photosynthetic capacity of the young ones are bigger than that of the old ones; the stand density do not affect the net photosynthetic rate obviously; as far as the different stand classes are concerned, the diurnal changes of net photosynthetic rate is closely related to the photosynthetic active radiation. For the different layers of the crowns, there are greater ecological factors (illumination intensity, temperature, humidity etc.) on the upper layers than on the lower layers: the CO2 concentration of the lower layers is greater than that of the upper layers, which is indeed an exception; the net photosynthetic rate on the upper layers of the crown is generally greater than that of the lower layers. It showed that the CO2 concentration is not a main factor in the natural changing range of the CO2 concentration. Different directions of the crown have different photosynthetic active radiation, which is generally like exposed to the sun﹥North﹥in the shade of crown. However, the changes of net photosynthetic rate are not quite the same, which is North﹥exposed to the sun﹥in the shade of crown.

不同年龄的兴安落叶松净光合速率不同,年龄小的个体光合能力高于年龄大的个体;群团密度与净光合速率没有显著的相关关系;而对不同分级木,净光合速率日进程变化规律与光合有效辐射有着密切的联系;林内树冠不同层次各生态因子有上层大于下层的趋势,而CO2浓度在下层的含量高于上层,净光合速率上层普遍大于下层,说明在林内自然CO2浓度变幅内,CO2浓度不是主要因子;兴安落叶松树冠不同方向的光合有效辐射不同,一般向阳﹥北向﹥背阴,而净光合速率变化有北向﹥向阳﹥背阴的趋势。

Initially, one specimen is tested at an irradiance of 25kW/m in the presence of a pilot flame and one specimen is tested at an irradiance of 25kW/m in the absence of a pilot flame to determine the mode which gives the quickest rate of smoke production.

首先,把一个样品用带有引燃火焰的25KW/m 的辐射进行测试,另外再用不带引燃火焰的25KW/m 的辐射进行测试,并用此来确定最快产生烟的一种方法。

A flat high efficiency super-broadband source was presented. We achieved a C+L-band superfluorescent source, in the region from 1524. 0 to 1600.4nm, the power of the ASE are over -12. 0dBm and the ASE profile excursion is only ±1. 4dB in the region from 1539. 2 to 1600.4nm. The power of the ASE is 22. 1mW and the power conversion efficiency is 18. 8%. 9. The amplification characteristics of thulium-doped fiber amplifier had been studied using the basic theory for fiber amplifier. The connection between the Tm-doped fluoride fiber and silicon fiber was accomplished, and we studied the TDFA and the reason that the expecting results hadn't achieved had been analyzed. The assumption of the Er-Tm-co-doped silicon fiber had been presented, and we studied the Er-Tm-co-doped silicon in cooperation with the correlative corporation, some results had been got and the further studies are carried on.

实验结果得到了覆盖C+L-波段的超荧光光源,在1524.0-1600.4nm波长范围内,自发辐射谱的功率均高于-12.0dBm;在1539.2-1600.4nm波长范围内,自发辐射谱不平坦度为±1.4dB;荧光总功率为22.1mW,功率转换效率为18.8%; 9、应用光纤放大器的基本理论,理论分析和研究了掺铥光纤放大器的放大特性;解决了氟化物掺铥光纤与硅基光纤的连接问题,进行了TDFA的实验研究,分析了没有得到预期结果的原因;最后提出了铒-铥共掺硅基光纤的构想,并与有关单位合作,共同研制了铒-铥共掺硅基光纤,得到了一些前期结果,进一步的研究仍在进行当中。

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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