useful height 中文意思是什麼
useful height
解釋
有效高度-
Then the periodic properties of geocenter motion in the x, y, z components are summarized. considering the statistical precision of the gps observations, the geometrical distribution of gps stations and their physical stablility, a new method to determine the parameters of geocenter motion is studied and analyzed. in order to have a better understanding of its effect on the height datum origin, the rule of geocenter motion in the horizontal and vertical components are also analyzed and some useful conclusions are drawn
提出了將譜分析與抗差估計相結合的抗差譜分析方法，並用該方法分析了地心運動時間序列的主要周期特性；為合理地確定地心運動參數，詳細研究與分析了一種新的定權方法對求解地心運動參數的作用，該方法充分利用了gps觀測量的統計精度、點位的幾何分佈以及物理穩定性；為了明確地心運動導致的高程基準的變化，分析了地心運動對地面點的水平分量和垂直分量的影響規律。 -
Height location accuracy is calculated, and useful conclusions are given in the end
最後，計算了目標高度測量精度並歸納了其特點，給出了有益的結論。 -
A physicist is especially useful in dealing with cloning questions : for example, using a sensitive enough barometer, a physicist could measure the atmospheric pressure at the top of a standing baby clone ' s head and at the soles of its feet and tell you the exact height of that baby clone. ( if a clone ' s foot even has a sole
研究復制人問題有個物理學家參與特別有用，譬如物理家可以用精準的氣壓計，測量一個站直的復制嬰頭頂和腳底的氣壓，然後告訴您他的準確身高（假設復制嬰的確有腳底） 。 -
There is no thoroughly rounded theory about displacement ventilation system in our country at present and our research begins recently. the study work of this paper will be useful for further optimization design of displacement ventilation system. this dissertation includes five parts. the first part introduces the development of the displacement ventilation and the background of research in domestic and oversea. in the second part, it gives working principle of displacement ventilation system and it ’ s advantages to the mixture ventilation. the study also gives a series of indexes to evaluate displacement ventilation system and specifies air supply terminal device and so on. it is needed to simulate and analyse the velocity field, temperature field and distribution of flow field. this is the third part. the forth part specifies the simulative method for thermal stratification of displacement ventilation system. it gives some factors affecting thermal stratification height such as inlet temperature, inlet velocity, heat transfer of wall body, distance of heat source and so on
本文的研究工作主要包括以下幾個方面的內容: （ 1 ）綜述了國內外相關的研究現狀和研究背景; （ 2 ）簡介了置換通風的工作原理，並分析了它相對于混合通風的優良特性及評價指標、末端裝置等; （ 3 ）對採用置換通風方式房間的溫度場、速度場和氣流分佈進行了模擬計算與分析; （ 4 ）對採用置換通風方式房間的熱力分層高度進行了模擬計算，並分析其影響因素，如:送風溫度、送風速度、圍護結構傳熱和熱源分佈等; （ 5 ）擬合了無量綱熱力分層高度相應于送風溫度t 、送風速度v 、熱源間距離l和圍護結構傳熱q的經驗公式。 -
The result presents, it is relatively useful for filling in the tooth cavity of big modulus 、 high thickness spur increase to increase suitability height mount piece, and the load of forging spur gears can be decreased by adding a mandrel, but unit area forging force does not cut down, and it has a little influence on filling in the tooth cavity
結果顯示，增加適當高度的鑲件對大模數、高厚圓柱直齒輪齒腔填充比較有利，增加芯棒可以降低齒輪成形載荷，但單位面積的成形力並未減少，且對齒輪的填充性影響不大。
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