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- This thesis studies a circularly polarized reflectarray based on a microstrip ring patch as a radiating element. 中文摘要本论文是以环形天线为幅射单元当架构,来研究一圆形极化反射阵列。
- To accomplish time delay scanning, variable delay networks are inserted in front of each radiating element. 要完成时滞扫描,就要把延时网络插入每个辐射单元的前端。
- Only a properly matched antenna system will allow maximum power transfer from the 50 transmission line to the radiating element. 只有一个匹配合适的天线系统才能在发射时使能量充分辐射出去。
- A conclusion can thus be gained that NRD-guide can be used as an UWB antenna and a radiating element of antenna arrays due to small side leakage. 先从频域的角度研究了NRD波导用作超宽带天线时相关参数选择的依据,然后用FDTD方法研究了NRD波导的传播特性以及辐射特性,并与平行板天线的辐射特性比较,得出该天线的突出优点是具有较小的侧向泄漏。
- As the excitation energy travels along the serpentine line, it will reach each successive radiating element with a uniformly increasing positive or negative phase shift. 当激励能量在馈线中传播时,将会在连续相邻的辐射单元中形成均匀递增的正的或者负的相移。
- Figure 7-1 and subsequent diagrams show only a limited number of radiating elements. 图7-1和后面的图表只显示了少量辐射单元的情况。
- In a phase-scanned radar system, the radiating elements are fed from a radar transmitter through phase-shifting networks or "phasers. 在相扫雷达系统中,从雷达发射机馈送到发射单元要经过移相电路或称为“移相器”。
- Photosynthetically active radiation (PAR) had no significant directly influence to the Pn, but through other factors affect Pn indirectly. 光合有效辐射对青冈栎光合速率直接影响不显著,而主要是通过其它因子间接影响光合速率。
- Wavelength-selective or photoselective mulches absorb photosynthetically active radiation (PAR) and transmit solar infrared radiation. 波长选择性或光选择性塑膜吸收光合活性辐射并传递太阳红外辐射。
- The results showed that the percentage of photosynthetically active radiation (PAR) was about 80.1 in the absorption spectrum. 结果表明,冠层上方总辐射、反射辐射、基部透射辐射及吸收辐射中光合有效辐射所占百分比分别为47.;5%25、25
- The frequency of fog occurrence has been as high as 40% of annual time and has reduced ca. 70% of the accumulated photosynthetically active radiation. 此区域一年有平均约40%25以上的时间受云雾笼罩,雾发生时林冠上光量平均降低约88%25,以年平均而言,林上光量因云雾之发生衰减约70%25。
- For modelling of three dimensional distribution of Photosynthetically Active Radiation (PAR) in crop canopy, the important contents of this thesis are as following. 本文的主要研究目的是建立玉米冠层内光合有效辐射(Photosynthetically Active Radiation, PAR)三维空间分布的模拟模型。
- The transmittance of solar total radiation and the transmittance of photosynthetically active radiation (PAR) in a gable-type, single PVC covered greenhouse were studied. 摘要在此研究中量测山型屋顶单层PVC塑胶布温室全日照量与光合成有效辐射量(PAR)之透过率物性。
- The previous discussion addressed the theory required to compute the relative phase shift between adjacent radiating elements in order to position the beam of an array-type antenna to a specific angle off of the antenna boresight axis. 前面的讨论中给出了计算使阵列天线的波束相对天线视轴线偏移一个给定角度所需的相邻单元间相对相移的理论。
- Single leaves nearly absorbed all of the ultraviolet radiation(UV) and 71.8%of photosynthetically active radiation,but transmitted 9.6%and reflected 18.6%. 对光合有效辐射的吸收也很大(71.;8%25),透射很小(9
- The orient has been playing an active role in the world economy. 亚洲一直在世界经济中发挥积极作用。
- He is an active member of the school's stamp club. 他是学校集邮俱乐部的一名活跃会员。
- An active volcano may explode at any time. 活火山随时都有可能爆发。
- Analytic results show that stomatal conductivity (cond) , intercellular CO_2 concentration(Ci) and photosynthetic active radiation(PAR) are main influencing factors of net photosynthetic rate in Carya illinoensis K. 影响浙江山核桃日变化的主要因子是蒸腾速率、气孔导度、胞间CO_2浓度、光合有效辐射以及气温; 影响湖南山核桃日变化的主要因子是气孔导度、胞间CO_2浓度以及光合有效辐射。
- The concepts of solar radiation, photosynthetically active radiation (PAR) and ultraviolet radiation are given in Chapter 1. The purposes and structures of this research are also included in this chapter. 第一章介绍了太阳辐射、光合有效辐射、紫外辐射等方面的一些基本概念,简要说明了本文的研究目的与研究内容。