The results show:from the midstream to downstream,the difference product curves of hydrological stations are rising at first,then continually going down.

研究結(jié)果表明:隨著從上游至中下游的順序,各水文站年徑流量差積曲線先上升,而后呈長時期連續(xù)下降的趨勢,而且順河流方向越往下,曲線的坡度越明顯,即徑流量減少的趨勢越明顯,但黑河干流上游地表徑流在過去的幾十年里并沒有減少,且有一定程度的增加,這說明各水文站徑流的差積曲線主要是由于人類活動的影響,導(dǎo)致下游生態(tài)環(huán)境受損。

The theoretical errors between the beeline method and the design equation were calculated by using Matlab mathematic software,the error curve was drawn,the errors between two design methods were analyzed and discussed.

利用Matlab數(shù)學(xué)計算軟件,對流漿箱錐形布漿總管采用直線法和設(shè)計計算公式的理論誤差進行了計算并繪制出誤差曲線,以此對2種設(shè)計方法之間存在的誤差進行了分析和探討,并結(jié)合工程實例對得出的優(yōu)化方案進行了驗證。

It is to measure error and error curve of gear′s major specifications, using modularized designing soft ware system and gear′s composition measuring instrument of computer controlling.

提出采用模塊化設(shè)計軟件系統(tǒng)，配用微機控制的齒輪綜合測量儀，測出齒輪主要項目的誤差和誤差曲線的方法，可大大提高測量精確度，效率和可靠性。

The optimum scheme of steering trapezium of four-wheel vehicle is investigated, the steering trapezium is optimized by using three kinds of optimum schemes, a parametric optimum program is developed, the approximation error curves of various schemes is put forward, the optimum results are compared.

對輪式車輛轉(zhuǎn)向梯形優(yōu)化方案進行了研究,用三種方案對轉(zhuǎn)向梯形進行了優(yōu)化,編制了參數(shù)化的優(yōu)化程序,給出了各種方案的逼近誤差曲線,將優(yōu)化結(jié)果進行了對比。

It is necessary to record the linear scale before and after log and the time difference curve in the acoustic variable density log.

闡述了聲波變密度測井時對其進行測前、測后線性刻度及記錄時差曲線的必要性。