您要查找的是不是：
- This thesis studies a circularly polarized reflectarray based on a microstrip ring patch as a radiating element. 中文摘要本論文是以環(huán)形天線(xiàn)為幅射單元當架構，來(lái)研究一圓形極化反射陣列。
- To accomplish time delay scanning, variable delay networks are inserted in front of each radiating element. 要完成時(shí)滯掃描，就要把延時(shí)網(wǎng)絡(luò )插入每個(gè)輻射單元的前端。
- Only a properly matched antenna system will allow maximum power transfer from the 50 transmission line to the radiating element. 只有一個(gè)匹配合適的天線(xiàn)系統才能在發(fā)射時(shí)使能量充分輻射出去。
- 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. 先從頻域的角度研究了NRD波導用作超寬帶天線(xiàn)時(shí)相關(guān)參數選擇的依據，然后用FDTD方法研究了NRD波導的傳播特性以及輻射特性，并與平行板天線(xiàn)的輻射特性比較，得出該天線(xiàn)的突出優(yōu)點(diǎn)是具有較小的側向泄漏。
- 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. 當激勵能量在饋線(xiàn)中傳播時(shí)，將會(huì )在連續相鄰的輻射單元中形成均勻遞增的正的或者負的相移。
- Figure 7-1 and subsequent diagrams show only a limited number of radiating elements. 圖7-1和后面的圖表只顯示了少量輻射單元的情況。
- In a phase-scanned radar system, the radiating elements are fed from a radar transmitter through phase-shifting networks or "phasers. 在相掃雷達系統中，從雷達發(fā)射機饋送到發(fā)射單元要經(jīng)過(guò)移相電路或稱(chēng)為“移相器”。
- Photosynthetically active radiation (PAR) had no significant directly influence to the Pn, but through other factors affect Pn indirectly. 光合有效輻射對青岡櫟光合速率直接影響不顯著(zhù)，而主要是通過(guò)其它因子間接影響光合速率。
- Wavelength-selective or photoselective mulches absorb photosynthetically active radiation （PAR） and transmit solar infrared radiation. 波長(cháng)選擇性或光選擇性塑膜吸收光合活性輻射并傳遞太陽(yáng)紅外輻射。
- The results showed that the percentage of photosynthetically active radiation (PAR) was about 80.1 in the absorption spectrum. 結果表明，冠層上方總輻射、反射輻射、基部透射輻射及吸收輻射中光合有效輻射所占百分比分別為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. 此區域一年有平均約40%25以上的時(shí)間受云霧籠罩，霧發(fā)生時(shí)林冠上光量平均降低約88%25，以年平均而言，林上光量因云霧之發(fā)生衰減約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層內光合有效輻射(Photosynthetically Active Radiation, PAR)三維空間分布的模擬模型。
- The transmittance of solar total radiation and the transmittance of photosynthetically active radiation (PAR) in a gable-type, single PVC covered greenhouse were studied. 摘要在此研究中量測山型屋頂單層PVC塑膠布溫室全日照量與光合成有效輻射量(PAR)之透過(guò)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. 前面的討論中給出了計算使陣列天線(xiàn)的波束相對天線(xiàn)視軸線(xiàn)偏移一個(gè)給定角度所需的相鄰單元間相對相移的理論。
- 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%. 對光合有效輻射的吸收也很大（71.;8%25），透射很?。?
- The orient has been playing an active role in the world economy. 亞洲一直在世界經(jīng)濟中發(fā)揮積極作用。
- He is an active member of the school's stamp club. 他是學(xué)校集郵俱樂(lè )部的一名活躍會(huì )員。
- An active volcano may explode at any time. 活火山隨時(shí)都有可能爆發(fā)。
- 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. 影響浙江山核桃日變化的主要因子是蒸騰速率、氣孔導度、胞間CO_2濃度、光合有效輻射以及氣溫； 影響湖南山核桃日變化的主要因子是氣孔導度、胞間CO_2濃度以及光合有效輻射。
- 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. 第一章介紹了太陽(yáng)輻射、光合有效輻射、紫外輻射等方面的一些基本概念,簡(jiǎn)要說(shuō)明了本文的研究目的與研究?jì)热荨?/li>
