Plowland pressure index is introduced to analyzed the utilization of rural plowland.

摘 要：為了土地的節(jié)約集約化利用，解決日益突出的建設(shè)用地與保護(hù)資源之間的矛盾亚洲小说在线，促進(jìn)國民經(jīng)濟(jì)進(jìn)一步發(fā)展人操人免费视频，采用耕地壓力指數(shù)等對(duì)農(nóng)村土地利用現(xiàn)狀作統(tǒng)計(jì)分析，并且計(jì)算1991—2006年的耕地利用的綜合技術(shù)效率亚洲Va欧美va国产va，結(jié)果表明：耕地壓力指數(shù)呈下降趨勢(shì)免费女人18毛片a级毛片视频，土地利用技術(shù)效率總體說來變化平穩(wěn)，呈現(xiàn)緩慢的上升趨勢(shì)北京一级毛片全过程。

The results showed that:(1) the potential of theoretical resources of rainwater was 3 211 420 m^3, the ratio of using in the same spot, different spot and rainwater collection reiterative utilization is 28.73%, 15.83% and 55.44%.

結(jié)果表明：(1)試區(qū)雨水資源最大理論潛力為3 211 420立方公尺日韩欧美精品A片免费看，就地利用、異地利用和疊加利用三種利用方式的理論潛力比例分別為28.73%www久久99～com、15.83%和55.44%H视频在线观看免费网站。

The results showed that grassland and farmland were the main land use types of research area with obvious reciprocal transformation. Grassland was mainly transferred to farmland in 1975-1990. Farmland was chiefly converted to grassland, and grassland tended to increase in 1990-2004. The landscape diversity in the study area rose with the contagion index decreasing and fragmentation degree being intensified during 1975-2000. The advantageous patches maintained good connectivity with the increasing patch cohesion index and the decreasing landscape fragmentation during 2000-2004. The change of human interference intensity played an important role on the variation of land use structure. Land use intensity was mainly affected by the changes in population as well as national land use policies. In the following 20 years, the agriculture land area would tend to decrease, the grassland and unused land area would have a slight reduction by contrasting the increasing the forest land area notably.

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With the case study on Wanzhou in the three-gorges reservoir area, it had been studied and analyzed that the potentialities of exploitation and use on land and ecological safety by established land use database, and it had been revealed that serious loss of water and erosion of soil, ecological environment fragility, the water conservancy project submergence a large amount of land, arrannements of the numerous immigrations need a large amount of land, contradictory remarkableness among human and land, and the latent crisis by extensive management land were main crises and questions of the land use.

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With the reform and economic development of our country, the utilization work of universities archives has been transformed from daily use into new characteristics which are the topicality, the scale, the diversity of use and the cyclical use of categories, and so on.

隨著我國改革和經(jīng)濟(jì)發(fā)展国产亚洲日韩精品超碰，高校檔案利用工作由過去的平日利用轉(zhuǎn)變?yōu)閷ｎ}性、規(guī)模性日韩孕妇自拍视频网站大全在线观看、利用方式的多樣性全国精品第一区黄片、類別利用的周期性等新特點(diǎn)手机黄网欧美高清。

In chapter 4, basing theories and methods of scientific visualization, and artificial neural network BP algorithm, we integrate the Visual C++, OpenGL graphics library and Excel VBA technique to develop the program of artificial neural network and to make the BP algorithm visually, this program works can be divided into four parts: Using C language to develop program about BP algorithm; Using Visual C++, develop the GUI Interface, make input parameter visually; Using OpenGL graphic technique to display the training sample point in three dimension; at last using Excel DDE technique display the error graphic tables in Excel system In chapter 5, on the view of engineering application, we establish new method of surface reconstruction basing artificial neural network, develop interface program between module and commercial CAD/CAM system, meantime deeply discuss some key problems, for example, setting up the base plane, using the API technique, cutting and editing surface boundary, and also discuss the more compliant problem: how to intersect surface, at end we finish the work of translation from our surface reconstruction module to commercial CAD/CAM system, then make reverse engineering system basing artificial neural network more useful.

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The paper mainly concerns about:(1)Proposing the idea of completing the job using GIS software by discussing deficiency of the traditional transportation job;(2)Discussing the transportation plan algorithm and the flow, in this foundation, designing the transportation model programming realization flow chart;(3)With the comparison of the domestic and foreign GIS software platform, determining ArcGIS Desktop which has large drawing edit and spatial analyse functions as the development platform of transportation planning;(4)In the data organization and the database establishment, by using the recent object-oriented spatial data— Geodatabase and UML, completing the system database design and establishment, including spatial database, attribute database as well as transportation network database

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Fourth, the project pierces through the technical way that relies on single technology or single combination and disassembly. It built up a technical system and integrated using new technics for hemp products deep processing according to the theory of zoological engineering. In time of realizing moderate unglue hemp, it developed a series of new products like low polymeric xylose, pectin, environmental fiberboard and organic manure that reaches delamination and multilevel use of hemp's combination and disassembly.

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If larger investment, under the guidance of professionals in the use of some investment instruments, such as the use of treasury bonds repurchase purchase of new shares, using repurchase cross-city arbitrage, using a similar bonds due between the yield gap arbitrage.

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