Desertification of agricultural land is the result of the fragile Karst agricultural system superimposes irrational human activities.

There are many ecological problems in western mountain areas in Ningxia, including frangibility of ecological environment, soil erosion, desertification of land, plant destruction and natural disasters. The urgency and necessity of ecological reconstruction in south mountain areas in Ningxia become important.

然而宁夏南部山区的生态环境的脆弱性、水土流失、土地沙化和植被破坏以及频繁的自然灾害等问题，使得生态失衡，因此加强生态环境重建势在必行。

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The loss of soil and water and the desertification of land are among the most outstanding ecological and environmental issues, to which the deforestation, opening up wastelands and cultivating land on steep slopes contribute greatly.

水土流失和土地沙化是西部地区最突出的生态环境问题，造成水土流失和土地沙化的重要原因就是毁林毁草开荒，陡坡种粮。

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In this time, frequent occurrence of drought exacerbated the desertification of land in Inner Mongolia, Grassland degradation, lead to further deterioration of ecological environment; cause serious implications to economic and social sustainable development.

同时干旱的频繁发生加剧了内蒙古土地沙化，草场退化，使生态环境进一步恶化，给社会经济可持续发展带来严重的影响。

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In the middle reaches: although agricultural oases have developed in a certain extent, natural vegetation decreased; salination, desertification of land have taken place; grassland degraded seriously.

中游地区农业绿洲虽有较大发展，但天然植被减少，土壤盐渍化、土地沙化、草场退化较为严重；

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The main way of controlling desertification of land in this area is protecting natural vegetation, changing the traditional method of wasteland reclaimation and strengthening remaking grassland of low quality.

该区域控制荒漠化的主要途径是：保护自然植被、改变向荒山要粮的传统思路和强化对沙化石质化低质草地的改造。

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Because of the rapid growth of the world population, the human living conditions are having been changed constantly; the shortage of resource and the desertification of land are becoming serious problems.

由于世界人口的急剧增长，人类的生存环境不断发生变化，资源日趋短缺，土地沙漠化严重。

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Sandstorm, a kind of destructive weather, quickens the desertification of land and reveals that the desertification of land has reached a high extent.

沙尘暴是一种危害性极大的灾害性天气现象。它的发生既是一种加速土地荒漠化的重要过程，又是土地荒漠化发展到一定程度的具体表现。

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The project of returning the grain plots to forestry is a significant measure of the state in solving soil erosion and desertification of land and other ecological environmental problems.

退耕还林工程是我国为解决水土流失、土地沙化等生态环境问题而采取的重大举措。

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The desertification of land and Its Countermeasures in the lower reaches of interior rivers in the arid zones of Northwestern China

我国西北干旱地区内陆河流域下游土地荒漠化及其对策

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Rocky desertification of land is caused by many factors, and the main point is the destruction of forest vegetation.

石漠化土地是多种因素共同作用的结果，归根结底是由于森林植被遭受破坏所致。

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Running off of water and soil and desertification of land; A Quantitative Model of Desertification Process

水土流失和土地沙漠化；土地沙漠化过程的数学模型

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The desertification of land has already become one of our country's most serious ecological environment problems, and sandstorm aggravating constantly makes ecological environment more serious.

土地沙化已经成为我国最严重的生态环境问题之一，而不断加剧的沙尘暴又使生态环境问题雪上加霜。

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The desertification of land has already become one of the most urgent, severe environmental problems faced in west of our country.

土地沙化已经成为我国西部面临的最为紧迫、严峻的环境问题之一。

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Application of Fiber in the Optical Synthetic Aperture Telescope

光纤在光学综合口径望远镜中的应用

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A new 10 m optical/ infrared telescope configuration

一种新的10米光学/红外望远镜

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The lunar optical astronomical telescope can be fixed in the cabin of the satellite outboard, so we can add a dome in the cabin to protect the telescope lens from the lunar dust.

由于望远镜可以安装在卫星最外侧的舱内，所以，可在卫星舱体上加护盖，防止月尘污染望远镜镜头。

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This paper presents a design approach to robust adaptive controllers for the nonlinear model of optical tracking telescope. The approach can be used in the case where there exist unmodeled dynamics and unknown bounded disturbances.

针对光学跟踪望远镜非线性数学模型，提出一种鲁棒自适应控制器的设计方法，可用于存在未建模动态和未知有界扰动的情况。

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Anti-backlash Research of Telescopes Driven by Dual-bias Motors Using Dynamic Method Review of Mechanical Structure of Micro-displacement Actuator for Optical Astronomical Telescope

望远镜双电机驱动消齿隙的动力学设计光学天文望远镜用微位移驱动器机构研究综述

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This paper presents a design approach to robust adaptive controllers for the nonlinearly parameterized model of optical tracking telescope.

列举了光学跟踪望远镜的实例，提出鲁棒自适应跟踪器的设计方案，将自适应调节器的设计思想扩展到自适应跟踪器的设计中。

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A Major Breakthrough of Celestial Imaging-New advance of optical interferometric telescope

天体成像的重大突破&光干涉望远镜阵的新进展

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