So this article introduces a kind of reasonable computing model, and applies it to calculating the sight distance that provided by crest vertical curves, moreover integrates it and method of PVSD to specify from quantity the principle of combining plane and vertical curves which belong to the freeway of plain district.
故本文引进一种较为合理的计算模型,来计算凸竖曲线上所能提供的视距,并结合PVSD法来具体量化平原区高速公路平曲线和凸竖曲线的组合原则,以期得到视觉效果最佳的立体线形。
The evaluation indexes of psychological and physiological burden degrees are established based on experiment and statistics method by research sight distance on single curve.
以单曲线部行车视距为研究对象 ,用实验和数理统计的方法建立驾驶员心理生理上负担程度的评价指标 ,评价现有公路的行车安全性和舒适性 ,并提出改进方案。
In the aspects of viewshed,and the view distance as well as psychological experience of the viewer,the paper analyzed comparatively the changes in the landscape visual features of the comprehensive natural lands.
从空间视域、视距与观景者视觉接收后所产生的心理体验等几个方面,比较分析了长江在三峡成库前的常年洪水位、成库后的145与175 m水位下沿江景观视觉特征的变化。
By means of deciding view angle α, the view distance d is controlled, the vanishing points are adjusted and the view points is got automatically.
阐述了一种透视投影的方法，通过预定视角α，自动控制视距ｄ和调整灭点，获取视点，并重建三维信息，从而易于选择视域，增加了直观性，减少了透视图形生成过程中的盲目性。
Visual range prediction for thermal imaging system by different static performance models;
基于不同静态性能模型的热成像系统视距估算
Based on the static performance of thermal imaging systems , a mathematical model for the visual range prediction adaptal for extended source target is studied.
从热成象系统静态性能出发，研究了热成象系统对扩展源目标的视距估算模型。
Based upon the signal to noise ratio of the image and static performance of thermal imaging systems, the effect of scene radiant characteristics to the visual range prediction of thermal imaging systems is studied in the prisent paper.
从图象信噪比及热成象系统静态性能出发，研究了景物辐射特性对热成象系统视距的影响。
The design principles of classroom s tables and chairs with physical e ngineering are to hold physical backbones natural and sitting tight and good opt ic angle and to consciously hold learning stadia from the start of physical engi neering so as to avoid myopia and backbone damage.
人体工学课桌椅的设计,从人体工学的原理出发,通过保持人体脊椎的自然挺直及视觉角度,自觉地保持了学习的视距,从而有效地防止近视眼的发生,也有效地防止了脊椎劳损。