use for the first time中文什么意思

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1. This research is proposed to formulate a new approach that used for the first time for quantitative groundwater vulnerability assessment ( gva ) through gis programs , based on visual modflow as comparative technique ; evaluate river - aquifer interaction and assess the effect of riverbed conductance on river leakage using the natural field conditions instead of hypothetical models that used in the pervious researches
   本研究使用了一种新的地下水脆弱性评价方法? ?基于gis与可视化modflow地下水流数值模拟结果上的地下水脆弱性评价，并用数值模拟结果作为其对比技术；评价了河流与附近含水层的相互作用。
2. A formula algorithm for saddle quantities is given and used for the first time . with forcing only addition , subtraction , multiplication and division to the coefficients of system ( 1 ) , the m - th quantity of singular point can be deduced and expressed directly in the coefficient of the system
   对任意正整数m ，在用计算机程序推导原点的第m个奇点量(焦点量、鞍点量)时，只需以系统右端系数为符号进行有限次加、减、乘、除的四则运算和符号推导，并且奇点量直接由原系统系数表示。
3. And the deficiencies are pointed out in present researches , such as highway capacity , level - of - service , influence factor of road alignments , etc . from these , it has confirmed that the thesis should be studied from rational analysis , quantitative analysis of level - of - service , impact on capacity of road alignments , setting - up simulation model , etc . the high - accuracy gps dynamic data acquisition appearance is proposed to be used for the first time to carry on the experiment of overtaking on two - lane highways , and experiment scheme is designed according to the driver ' s perceive to judge each overtaking course . based on the experiment data , it can get two important parameters of acceptant gap ? the critical gap of overtakable time headway and returnable time headway through data processing , which can offer the strong support to the research of two - lane highway capacity with qualitative and quantitative analysis . besides , the experiment methods is provided to observe overtaking ratio and to measure the
   研究中首次提出了运用高精度gps动态数据采集仪对双车道公路上的超车行为进行观测,设计了根据驾驶员感受度来衡量超车过程的实验方案,并通过后期数据处理得到了超车过程中两个重要的可接受间隙参数-可超车车头时距和可回车车头时距的临界间隙值,为定性和定量分析双车道公路通行能力提供有力的数据支持;同时,还提出了观测超车率的实验方法以及测量加速度干扰的实验方案,统一了计算加速度干扰的时间统计间隔,为双车道公路的服务水平量化研究奠定基础;最后还简单介绍了驾驶员问卷调查法和仿真程序中模型参数标定和验证的数据采集方法。