stadia(tacheometer staff)

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.

故本文引進一種較為合理的計算模型,來計算凸豎曲線上所能提供的視距,并結合PVSD法來具體量化平原區高速公路平曲線和凸豎曲線的組合原則,以期得到視覺效果最佳的立體線形。

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

以單曲線部行車視距為研究對象 ,用實驗和數理統計的方法建立駕駛員心理生理上負擔程度的評價指標 ,評價現有公路的行車安全性和舒適性 ,并提出改進方案。

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.

從空間視域、視距與觀景者視覺接收后所產生的心理體驗等幾個方面,比較分析了長江在三峽成庫前的常年洪水位、成庫后的145與175 m水位下沿江景觀視覺特征的變化。

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.

闡述了一種透視投影的方法，通過預定視角α，自動控制視距ｄ和調整滅點，獲取視點，并重建三維信息，從而易于選擇視域，增加了直觀性，減少了透視圖形生成過程中的盲目性。

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

基于不同靜態性能模型的熱成像系統視距估算

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

從熱成象系統靜態性能出發，研究了熱成象系統對擴展源目標的視距估算模型。

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.

從圖象信噪比及熱成象系統靜態性能出發，研究了景物輻射特性對熱成象系統視距的影響。

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.

人體工學課桌椅的設計,從人體工學的原理出發,通過保持人體脊椎的自然挺直及視覺角度,自覺地保持了學習的視距,從而有效地防止近視眼的發生,也有效地防止了脊椎勞損。