log periodic 中文意思是什麼

log periodic 解釋
對數周期的
  • log : n 1 原木，圓木，乾材。2 測程儀，計程儀。3 航海日誌，（飛行員用的）航海日誌；旅行日記。4 〈英國〉...
  • periodic : adj. 1. 周期的，回歸的，定期的，定時的；間歇的，時時的。2. 某一時期的。3. 【修辭學】掉尾句的，圓周句的；美詞麗句的。adj. 【化學】高碘的。
  1. Secondly, in this paper, the four typical uwb antennas of tem horn antenna, log - periodic antenna, biconical antenna and helical antenna are theoretically analyzed and the uwb antenna design methods are generalized and discussed

    其次，本文對tem喇叭天線、對數周期天線、雙錐形天線和螺旋天線四種典型的超寬帶天線進行了理論分析，總結並討論超寬帶天線的設計方法和手段。
  2. Based on the previous theory, the fdtd method is used to analyze practical antennas, which include dipole antenna, microstrip antenna, log - periodic antenna and broadband resistance loaded monopoles. the particular problems that occur in the calculating of vary type antennas are discussed. the cross - section field of microstrip line and two - conductor line are analyzed, and the effect on the numerical result arising from the incident cross - section mesh size is discussed

    在前面理論的基礎上，將fdtd用於振子天線、微帶天線、對數周期天線、電阻加載振子天線等各種天線的計算中，對各種不同類型天線計算中所遇到的特殊問題進行了詳細的討論，並分析各種開放場傳輸線如微帶線、平行雙線等橫向場分佈，討論了入射網格橫向截斷區域的大小對計算結果的影響。
  3. Shows the threshold exception log, drilling down to see periodic exception details for sql activity

    展示了閾值異常日誌，並將其向下展開，以查看sql活動的某一時期的異常細節。
  4. After switching, you need to take periodic data backups to protect your data and to truncate the inactive portion of the transaction log

    切換之後，需要定期備份數據，以保護數據並截斷事務日誌的不活動部分。
  5. On basis of above researches, the multi - periodic log - optimal portfolios models with the risk control of var and cvar were researched further, and the properties of the existence and uniqueness of the optimal solutions of the two models were proved and other properties of the two models were discussed too

    進一步提出了多周期var 、 cvar風險控制的log ?最優資產組合模型，研究了其最優解的存在性、唯一性和模型的有關性質，並給出了數值計算。
  6. A database administrator typically creates a full database backup at a periodic interval, such as weekly. optionally, an administrator creates a differential backup at a shorter interval, such as daily ; and creates a transaction log backup frequently, such as every 10 minutes

    數據庫管理員通常會定期（例如每周）創建完整數據庫備份；或者，以較短間隔（例如每天）創建差異備份；並非常頻繁地（例如每隔10分鐘）創建事務日誌備份。
  7. The suitable tree - like and 3 / 2curve fractal symmetrical vibrators are chosen to make up a log - periodic antenna ( lpda ), the performance, such as reflectance, input impedance, radiation pattern and gain are also compared with normal log - periodic antenna by cst microwave studio ? simulation, in order to investigate the effect of antenna miniaturization. the application of fractal technology in microstrip antenna is introduced at

    最後本文介紹了分形技術在微帶天線中的應用，研究了minkovski分形雙層微帶天線的阻抗特性和方向圖特性，並與普通雙層微帶天線的性能進行比較，討論了minkovski分形對微帶天線尺寸的縮減作用，同樣研究了分形對交叉極化的影響。
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