辐射体

In Chapter 4, the meander line and fractal technique are introduced to the design of antenna.

设计了一种用双杆作辐射体的平面组合单极子天线，具有结构简单、尺寸小、频带宽等诸方面的优点。

Effects of gamma irradiation on shoot regeneration from leaf and bud growth in vitro of strawberry 1 The leaf was very sensitive to the gamma irradiation, and 'Toyonoka' was more sensitive than 'Akihime'. The LD50 (50% decrease of generation) of strawberry leaf was between 10 and 20 Gy. 2 Strawberry leaves were inoculated in vitro at 8 d-15 d after gamma rays irradiation, and the shoot regeneration rate from of 'Toyonoka' increased at 10 Gy and almost no difference from 20 Gy to 40 Gy. The positive effect dose for 'Akihime'.was from 10 Gy to 30 Gy, however, 40 Gy decreased shoot regeneration rate.

2.60Co γ辐射对不同品种草莓离体叶片再生及芽生长的影响 1）叶片对辐射敏感，叶片再生的半致死剂量为10 Gy-20 Gy，'丰香'品种比'章姬'品种敏感； 2）辐射后8 d-15 d接种，'丰香'叶片的不定芽再生率在剂量10 Gy呈上升趋势，而其他剂量则几乎未见有变化，'章姬'在剂量10 Gy-30 Gy，叶片的不定芽再生率提高较大，40 Gy仍表现轻微下降； 3）适宜的辐射剂量对草莓试管苗增殖有促进作用。

Pure and doped sodium bismuth tungstate crystals are grown and related technique parameters are investigated. The properties of NBW crystal as Cherenkov material are studied in this paper.

本文研究了钨酸铋钠NaBi〓及其掺杂晶体的坩埚下降法晶体生长，并对该晶体作为Cherenkov辐射体的性能进行了探讨。

The radiation radius of the radioactive radium radi ator in the stadium is varia ble.

有放射性的镭辐射体在广场中的辐射半径是可变的。

Then it is corrected that the brightness temperature with the radiation coefficient ελ of gray body.

通过比较等辐射量的黑体温度，测出灰体的视在亮度温度———辐射温度；并根据灰体辐射系数ελ和测定的辐射温度修正灰体的测量温度，获得实际温度。

The printed UWB antenna is comprised of a planar monopole radiator and the ground plane which are connected to a coaxial cable to launch RF signals. This kind of ground and antenna system is essentially an unbalanced design, where electric currents are distributed on both radiator and ground plane, and then leakage to the outer conductor of the feeding cable. The impedance matching and radiation pattern will be influenced in the low band, which are our focus. Finally, some techniques will be proposed to reduce the cable effect on the antenna performance.

进行超宽频天线量测时，吾人会利用同轴缆线连接到网路分析仪，这时的同轴缆线不只是扮演一个传输讯号的工具而已，由於单极天线的不平衡结构，对低频而言，接地回流电流会泄漏到同轴接地的导体外部，造成同轴缆线也是一个辐射体，影响到天线低频时的阻抗匹配与辐射特性，因此本论文将探讨同轴缆线对於天线一些参数的影响，并研究提出解决的办法。

The stars are radiators of vast power.

恒星是巨大能量的辐射体。

In this work, the failure problem analysis was carried out based on self developed carbon fiber and carbon composite heating elements, with the purpose of process optimization, the twisting and winding equipment for ply yarn carbon fiber heat ...

本文首先进行了碳素电热元件的失效问题分析，以优化工艺为目的研制了碳素纤维电热体股线的捻制缠绕设备和碳素复合材料电热体的高温定型装备，在制备出高质量碳素电热元件的基础上测试其相关的电热性能并进行机理分析，之后系统研究碳素纤维及其复合材料电热体热辐射性能的变化规律，最后从工程应用出发，进行碳素复合材料电热元件辐射热流密度分布的数值模拟。

Ring appears armature electro-acoustic transducer, abandoned plane ferromagnetic disk Diaphragm Park, began to use his ring on the armature and the bonding of non-ferrous magnetic Park tapered at the end of radiator to lower the quality of the sound output pressure to increase by 5 decibels, to extend the frequency range of about 500Hz, the successful design, moving iron type electro-acoustic transducer to achieve the ultimate performance.

1950年出现的环型衔铁电声换能器，摒弃了铁磁性平面园盘振膜，开始采用环状衔铁和粘接其上的非铁磁性园锥形辐射体来降底质量，使输出声压提高了5分贝，频率范围扩展了约500Hz，这一成功设计使动铁式电声换能器的性能达到了极致。

The properties of NBW crystal as Cherenkov material are studied.

对NBW晶体做为Cherenkov辐射体的性能进行了研究。

By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.

到它被攻陷的时候，里面多数的犯人是写了反对政府贪污文章的作家。

The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.

在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色，卵在发育96h后卵基本全部孵化。