diurnal change 中文意思是什麼
diurnal change
解釋
周日變化-
Over water the diurnal change in refraction is likely to be small.
在水面上，折光的周日變化可能是很小的。 -
If there were no drift or diurnal change, the differences would add up to zero around the loop.
如果沒有漂移或日變，這些差值相加后必等於零。 -
We firstly testified that the manipulative light conditions could n ' t eliminate the circadian change of ultrastructures of compound eyes in m. nipponense. the compound eyes showed corresponding light adaptive features during the diurnal dark adaptation, and showed dark adaptive features to some extent during the nocturnal light adaptation
首次用實驗證實人工光照不能消除日本沼蝦復眼超微結構的晝夜節律性變化，即在白天的暗適應時仍表現出相應的明適應特徵，而在晚間的明適應時則表現出一定程度的暗適應特徵。 -
Second part - the main contribution and research results of this paper are focused on as follows : ( 1 ) how to use the measurements of a dual frequency gps receiver to determine the ionospheric delay correction model for single frequency gps of a local range ; ( 2 ) how to separate the instrumental biases with the ionospheric delays in gps observation ; ( 3 ) how to establish a large range grid ionosphere model and use the gps data of chinese crust movement observation network to investigate the change law of ionospheric tec of china area ; ( 4 ) how to improve the effectiveness of correcting ionospheric delays for waas ' s users under adverse conditions. ( 5 ) how to establish the basic theory and the corresponding framework of monitoring the stochastic ionospheric disturbance using gps ( 6 ) how to improve the modelling ability of ionospheric delay according to its diurnal, seasonal, annual variations based on gps ; ( 7 ) how to meet the demand of correcting the ionospheric delay of high - precision orbit determination for low - earth satellite using a single frequency gps receiver 1 extracting ( local ) ionospheric information from gps data with high - precision the factors are systematically described and analyzed which limit the precision of using gps data to extract ionospheric delays
二、具體研究工作的系統報告，主要集中在以下幾方面：研究如何利用單臺雙頻gps接收機的觀測信息確定電離層延遲改正模型，為小范圍的單頻用戶服務；研究如何實時分離gps觀測中的儀器偏差與電離層延遲；研究如何建立較大區域的電離層格網模型，進而初步設想利用中國地殼運動觀測網路深入研究我國領域的電離層的電子濃度變化規律；研究單頻用戶在不利條件下，如何更好地利用電離層延遲改正信息；研究利用gps監測隨機電離層擾動的基本理論和框架方案；研究如何綜合顧及電離層的周日、季節和年變化，進一步提高利用gps模擬電離層延遲的能力；研究如何實現星載單頻gps低軌衛星的精密測軌中的電離層延遲改正要求。 -
The diurnal change of cg lightning is obvious, and it generally takes on bi - peak and bi - valley pattern. the two peak values occur at 15 : 00 and 03 : 00 respectively, whereas the two valley values occur at 09 : 00 and 22 : 00respectively. the mean current of positive cg lightning is slightly bigger than that of negative one
閃電的發生也有明顯的日變化，總體呈雙峰雙谷形式， 15時和03時為兩個峰值，兩個谷值分別出現在9時和22時。
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