low-order reflection 中文意思是什麼

low-order reflection 解釋
低價反射
  • low : adj 1 低的；淺的，矮的。 low flight 低飛。 a low temperature 低溫。 low tide [water] 低潮。 The g...
  • order : n 1 次序，順序；整齊；（社會）秩序，治安；狀況，常態；健康狀態；條理；會場秩序；議事程序，日程；...
  • reflection : n 1 【物，計】反射；反射波[光，熱，音，色]。2 反映；反影，映像，（映在水等中的）影像；〈比喻〉學...
  1. This dissertation only considers the signal ’ s distortion by interconnect, such as delay, reflection, discontinuity of microstrip, crosstalk and simultaneous switching noise, and so on. nowadays, there are some simulation software in pcb level, but they are lack of the well ability of modeling. in order to simulate the interconnect accurately, we have to make use of three - dimension full wave analysis method, whose disadvantage is low speed in computing, but is competent for developing rules in high - speed designs

    目前也有一些針對這些噪聲的高速pcb板級模擬軟體，但它們都缺乏詳盡的建模能力，特別是當頻率逐漸提高和電路板日益復雜后，更是顯得無能為力，要精確地對互連結構進行分析，三維全波模擬器似乎不可缺少，其缺點就是速度慢，對整板模擬很難實現，但非常適用於規則開發，而這正好是本文除了建模與模擬方法研究外另一個重點。
  2. Before now because operating frequency was low, suppose that electrode in saw device has no thickness and thus second order effects are ignored. these second order effects, including electromagnetic feedthrough, triple transit interference, body acoustic wave, reflection and so on, affect the performance of saw device in high frequency. so it is important that second order effects are researched and improved in depth

    這樣的需求要求了saw設計者考慮在低頻時未加考慮的二階效應，大多數以前的分析假設電極無厚度而忽略了的二階效應（電磁直通、三次行程干擾、體聲波、聲電再生等）在高頻時對saw器件的性能影響較大，要求對其二階效應進行深入研究並對其進行改善。
  3. According to the order from the high percentage to the low percentage, the components are : the teaching of the new knowledge, the discussion between teacher and students, the classroom questioning, the guidance after class, the correcting of students " papers, the brief summary after class, and the mathematical reading. it also does a preliminary research on significance of mathematical communication, that is, it helps the students to develop the self - study ability, to improve their mathematical quality, and it also helps the teacher to adopt the criticism - and - reflection teaching. the data of the survey indicates that teachers think highly of the mathematical communication activities during the classroom teaching ; in present mathematical communication acting is not satisfying

    理活動因素；數學閱讀與數學交流的關系，數學閱讀的分類；數學閱讀中進行數學交流活動的機制；數學閱讀中數學交流的實施現狀：學生的閱讀仍然屬于低水平的閱讀、被動式閱讀：影響數學閱讀中的數學交流活動的因素重要程度從高到低是：學生對數學知識的喜好、學生原有知識結構、學生的邏輯推理能力、學生對數學語言的掌握程度、學生對數學元認知的運用程度、閱讀材料的內容、進行數學閱讀的時間、進行數學閱讀的環境。
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