| 1. | Earth gravitational model
地球重力模型 |
| 2. | Prior to applying a gravity model , one has to calibrate the impedance function
应用重力模型的之前，你应该先校准阻抗函数。 |
| 3. | The gravity model explicitly relates flows between zones to interzonal impedance to travel
重力模型明确的通过地区间的阻抗来将分布量和小区联系起来。 |
| 4. | Calibration typically entails an iterative process that computes coefficients such that the gravity model replicates the trip length frequency distribution and matches base year productions and / or attractions
典型的校准在系数计算中通常有一个迭代过程，好像重力模型复制了出行距离频数分布，同时匹配基年发生和吸引。 |
| 5. | Gravity model : the typical inputs include one or more flow matrices , an impedance matrix reflecting the distance , time , or cost of travel between zones , and estimates of future levels of productions and attractions
重力模型：输入的基本数据包括一个或多个流量矩阵，反映距离的阻抗矩阵，小区间的出行时间和成本，未来发生和集中预测。 |
| 6. | The gravity model was originally motivated by the observation that flows decrease as a function of the distance separating zones , just as the gravitational pull between two objects decreases as a function of the distance between the objects
重力模型起初的目的是描述是交通量随着小区之间的距离而减小，正如万有引力随着量物体之间的距离而减小。 |
| 7. | Calibrating the gravity model consists of evaluating the parameters of the impedance function ( or the values in the friction factor table ) so that the gravity model reproduces , as closely as possible , the base year productions and / or attractions and the base year trip length distribution
校准重力模型就是计算阻抗函数参数（或者摩阻系数表中的值） ，使其尽可能吻合基年产生和吸引，以及基年的出行距离分布。 |
| 8. | In chapter three , the author makes some study on the spatial distribution of domestic tourist markets in sanya city . secondly , based on gravity model , he established a spatial potentiality model of tourist flows , which is useful to direct tourist market positioning and marketing
第三章研究了三亚市国内客源市场空间分布特征，在重力模型的基础上建立了旅游客流空间潜力模型，分析了三亚市旅游者空间行为特征。 |
| 9. | 2 . the model principle of four steps in passenger flow forecasting is illustrated and the software flowchart combining the transcad technology with the transit planning model is listed , gravity model is calibrated , and forecasted passenger flow of planning road network in the target year is obtained
2 .结合transcad技术和交通规划模型,对公交客流预测四步骤进行模型原理说明并给出软件流程,对重力模型进行标定,得出规划道路网目标年公交客流预测值。 |
| 10. | Among them distributing with the traffic of average rate of increase law calculation flow of passengers capacity ; the flow of passengers is brought out in model law calculation with gravity ; constructing the rate sharing responsibility for building model calculation according to transportation resistance shifts the flow of passengers ; think over time value when the flow of passengers is brought out in the calculation
以胶济铁路提速改造为例，就构造的客运量预测模型作了应用研究。其中以平均增长率法计算客流量的交通分布；以重力模型法计算诱发客流；依据运输阻力构建的分担率模型计算转移客流；在计算诱发客流时考虑了时间价值。 |
