source time range 中文意思是什麼
source time range
解釋
來源時間范圍-
An assumption is verified that the multi - path arrival time differences calculated by ray model is almost the same as that by normal mode model if higher frequencies for the source are used ( e. g., frequencies range between 600hz and 1600hz ). hi other words, the calculation of the multi - path arrival time differences by ray model is reliable. 2
該方法的研究結果驗證了一個重要的假設：當信號頻率較高時（例如600hz 1600hz ） ，用聲線模型計算多途到達時延差與簡正波模型得到的結果基本一致，並且聲線模型計算多途到達時延差具有較高的可信度。 -
The hardware circuit design include : industrial control computer configuration, selection of industrial control board type, design of the power supply and monitoring interface circuit, design of signal processing interface circuit ( the constant current source circuit, the time base signal processing circuit, the processing circuit for the signal to be measured ), design of panel control circuit, design of the system self - checking circuit, and etc. the program flow hart include : main program flow chart, system boot - strap self - checking program flow chart, manual static testing program flow chart, semiautomatic static testing program flow chart, automatic static testing program flow chart, dynamic testing program flow chart, transient testing program flow chart, source voltage and current monitor program flow chart, investigate function testing program flow chart, and etc. the measure system offers six working power supplies, the signal of time base, the signal of constant current source, sine wave signal and step to leap signal, and measures the frequency of the output pulse signal of the wide range pulse convert circuit accurately under three kinds of different test state ( static form, dynamic form and transient form )
硬體電路設計包括：工控機配置、工控板卡選型、產品電源及監控介面電路設計、信號處理介面電路（恆流源電路、時基信號處理電路、被測信號處理電路）設計、面板控制電路設計、系統自檢電路設計等。程序流程圖包括：主程序流程圖、系統開機自檢程序流程圖、手動靜態測試程序流程圖、半自動靜態測試程序流程圖、自動靜態測試程序流程圖、動態測試程序流程圖、暫態測試程序流程圖、電源電壓和電流監控程序流程圖、研究功能測試程序流程圖等。測試系統提供六路工作電源、時基信號、恆流源信號、正弦波信號和階躍信號，並對三種不同測試狀態（靜態、動態、暫態）下大量程脈沖變換電路輸出脈沖信號的頻率進行精確測量。 -
The propagation characteristics of underwater acoustic channels and their influences on long - range information transmission are studied thoroughly. based on the sonar equation, the optimal frequency band is abtained. from the calculation about transmission loss, the source level is forecasted. based on the random time varying channel theory, the fading characteristics of long - range underwater acoustic channels are analyzed
系統、深入地研究了水聲通道特性及其對水聲遠程信息傳輸系統的影響；從聲納方程出發，確定了系統的最佳工作頻段；在聲傳播損失計算的基礎上，給出了聲源級的預報；基於時變通道理論，描述了遠程水聲通道的衰落特性。 -
It is brought forward for the first time that in summertime the pco2 of the surface water near the changjiang estuary, whose salinity is less than 20, decreases dramatically from upwards of 800uatm to downwards of 300uatm within the range of less than half one latitude, suggesting a transformation of a strong co2 source to a co2 sink in a finite space
首次調查得到，夏季長江口附近鹽度20區域的水體極高的pco _ 2 （最高測得800 atm以上）在不到半個緯度的范圍內遞減到300 atm以下，即由一個很強的大氣co _ 2源，有限的空間尺度范圍內變成為匯區，有著極大的梯度變化。 -
It also provides technology services for land use dynamic monitoring, approval and management of construction land. by the construction of system, it solves the problem of land use status investigation in 1990, such as time - consurming, wide in range, different technology level, uneven data quality and so on ; it also provides the renewable method of land use status information. in the end, the author raised quality control of land use status information source, organization and coordination of system, renewable standard of system
通過系統的建設，解決了以1990年土地利用現狀調查成果為基拙所帶來的時間跨度長、范圍廣，技術水平差異大，土地利用現狀數據質量參差不齊等對系統建設的影響問題，以及土地利用現狀信息系統更新方法;提出了土地利用現狀信息系統建設信息源的質量控制，系統的組織與協調，系統更新的標準和規范等值得討論的問題。
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