Visual range prediction for thermal imaging system by different static performance models;

Based on the static performance of thermal imaging systems , a mathematical model for the visual range prediction adaptal for extended source target is studied.

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.

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.

The evaluation indexes of psychological and physiological burden degrees are established based on experiment and statistics method by research sight distance on single curve.

Combining with the status of the safety design of interchange, in view of such factors impacting traffic safety as interchange′s exit and entrance, apparent distance, ramp′s vertical plane design, safety facility and so on, the problems deserving notice in the safety design of interchange are discussed, which can be consulted by peers.

The transmission line apparent distance and altitude difference survey are the necessary projects which the transmission line surveys,its metrical data is also the transmission line\'s other project construction,the inspection,and the computation important basis.

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.

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.

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.