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      • Application of Integration of Spatial Statistical Analysis with GIS to Regional Economic Analysis

        This paper summarizes a few spatial statistical analysis methods for to measuring spatial autocorrelation and spatial association, discusses the criteria for the identification of spatial association by the use of global Moran Coefficient, Local Moran and Local Geary. Furthermore, a user-friendly statistical module, combining spatial statistical analysis methods with GIS visual techniques, is developed in Arcview using Avenue. An example is also given to show the usefulness of this module in identifying and quantifying the underlying spatial association patterns between economic units....

        2020-11-22 17:58:37瀏覽:22 spatialstatisticalAnalysisAutocorrelationassociation

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      • Fractal analysis on the spatial distribution of acoustic emission in the failure process of rock spe

        The spatial distribution of acoustic emission (AE) events in the failure process of several rock specimens was acquired us-ing an advanced AE acquiring and analyzing system.The box counting method (BCM) was employed to calculate the fractal dimen-sion (FD) of AE spatial distribution.There is a similar correlation between the fractal dimension and the load strength for different rock specimens.The fractal dimension presents a decreasing trend with the increase of load strength.For the same kind of specimens,their FD values will decrease to the level below a relatively same value when they reach failure.This value can be regarded as the critical value,which implies that the specimen will reach failure soon.The results reflect that it is possible to correlate the damage of rock with a macroscopic parameter,the FD value of AE signals.Furthermore,the FD value can be also used to forecast the final fail-ure of rock.This conclusion allows identifying or predicting the damage in rock with a great advantage over the classic theory and is very crucial for forecasting rockburst or other dynamic disasters in mines....

        2020-11-22 17:58:37瀏覽:26 roekburstAcousticemissionspatialdistributionfractaldimensioncritical

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      • 基于信息熵的河南省年降水量時空變化研究

        選取河南省1960-2006年共83個站年降水量,將信息熵理論應用在河南省年降水量時空變化研究上,計算每站的年降水量時間序列和年降水量與其極小值的相對量序列的熵估計值、全省各年年降水量分布和年降水量與其多年平均降水量的相對值分布的熵估計值.計算結果表明:河南省年降水量的年際變化自西北東南方向增大,自南向北減小,自西向東增大,在西南東北方向則沒有明顯的規律;河南省年降水量相對值的年際變化自西南東北方向增大,在其他方向上則沒有明顯的規律;1966,1976,1999和2001年的河南省年降水量的空間分布較均勻,2000年的年降水量的空間分布不均勻;1986年的年降水量與其多年平均的相對值空間分布較均勻,2000年的年降水量與其多年平均的相對值空間分布不均勻....

        2020-11-03 10:30:25瀏覽:17 信息熵年降水量時空變化不確定性informationentropyannualprecipitationtemporalandspatial

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      • 河南省碳排放的時空變化研究

        研究了河南18個省轄市2005~2013 年的碳排放量和碳排放強度,分析了其時空變化和區域差異.結果表明:2005~2010年18個省轄市的碳排放量呈整體上升趨勢,且在2010 年達到一較大值,2011 年迅速降低隨后又逐漸上升;碳排放強度也可以2010年為界分兩個階段,2005~2010 年18個省轄市碳排放強度均呈逐年降低趨勢,但降幅較小,2011年降至一較低值,隨后則逐年降低;18個省轄市碳排放量的區域絕對差異和相對差異都較大,碳排放強度的區域絕對差異不斷加大,而區域相對差異則不斷減小....

        2020-11-03 10:30:25瀏覽:21 碳排放時空變化河南省carbonemissionspatialandtemporalvariationsHenanprovince

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      • 中國栓皮櫟資源生產燃料乙醇的潛力及其空間分布

        利用氣候、土壤、地形和土地利用等數據,運用ArcGIS的空間疊加分析功能,定量分析中國栓皮櫟資源的空間分布及乙醇生產潛力.結果表明:中國適宜栓皮櫟分布的區域較廣,總面積可達26 250.41×104hm2,栓皮櫟乙醇總潛力為270.90×104 ~1 204.11×104t·a-1,至少滿足我國目前E10乙醇汽油需求的42.71%;適宜栓皮櫟生長的未利用地面積為1.53×104hm2,其乙醇生產潛力可增加中國目前E10汽油0.88%左右.如果選育出優良的品種,進行科學的栽培管理,在保證糧食安全的前提下,至少可滿足我國目前E10乙醇汽油需求的41.21%以上.因此,栓皮櫟可以作為我國將來燃料乙醇的重要原料來源....

        2020-09-30 09:14:00瀏覽:19 栓皮櫟燃料乙醇資源潛力空間分布Quercusvariabilisbioethaonlresourcepotentialspatial

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      • Spatial coupling relationships of gas hydrate formation in the Tibetan Plateau

        At present, gas hydrates are known to occur in continental high latitude permafrost regions and deep sea sediments. For middle latitude permafrost regions of the Tibetan Plateau, further research is required to ascertain its potential development of gas hydrates. This paper reviewed pertinent literature on gas hydrates in the Tibetan Plateau. Both geological and ge-ographical data are synthesized to reveal the relationship between gas hydrate formation and petroleum geological evo-lution, Plateau uplift, formation of permafrost, and glacial processes. Previous studies indicate that numerous residual basins in the Plateau have been formed by original sedimentary basins accompanied by rapid uplift of the Plateau. Ex-tensive marine Mesozoic hydrocarbon source rocks in these basins could provide rich sources of materials forming gas hydrates in permafrost. Primary hydrocarbon-generating period in the Plateau is from late Jurassic to early Cretaceous, while secondary hydrocarbon generation, regionally or locally, occurs mainly in the Paleogene. Before rapid uplift of the Plateau, oil-gas reservoirs were continuously destroyed and assembled to form new reservoirs due to structural and thermal dynamics, forcing hydrocarbon migration. Since 3.4 Ma B.P., the Plateau has undergone strong uplift and extensive gla-ciation, periglacier processes prevailed, hydrocarbon gas again migrated, and free gas beneath ice sheets within sedi-mentary materials interacted with water, generating gas hydrates which were finally preserved under a cap formed by frozen layers through rapid cooling in the Plateau. Taken as a whole, it can be safely concluded that there is great temporal and spatial coupling relationships between evolution of the Tibetan Plateau and generation of gas hydrates....

        2020-09-13 23:35:02瀏覽:30 gashydratesPetroleumgeologyfrozenearthandGlacialPlateauupliftspatial

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      • Study on the TU gas for the GEM-TPC detector

        In this paper several different working gas mixtures for GEM-TPC were evaluated based on a Garfield simulation. Among them, Ar:CH4:CF4=90:7:3 (named herein TU gas) was selected for a detailed study because of its better performance. Some performances of drift velocity, transverse diffusion, spatial resolution and the effective number of electrons in various electric fields were obtained. The performance of a GEM-TPC prototype working in the TU gas was studied and compared with that in Ar:CH4=90:10 (P10 gas)....

        2020-09-13 23:35:02瀏覽:32 GEMdetectorTPC(timeprojectionchamber)spatialresolutiontransverse

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      • 基于FFT的空間重采樣算法的性能分析

        空間重采樣方法是一種不需要角度預估計的寬帶DOA估計方法,它利用相位聚焦的方法實現寬帶信號中不同信號子帶的信號子空間的一致。而基于FFT變換的空間重采樣算法利用傅里葉變換特性實現空間采樣頻率的變換,但此方法對陣元的選擇以及參考頻率的選擇等都有一定的要求,本文從陣元個數、參考頻率、子帶劃分、信號入射角度以及信號帶寬等多個方面對基于FFT 空間重采樣算法進行了全面細致的性能仿真分析,為該方法的應用推廣、工程實現提供了較為有意義的參考。...

        2020-09-02 20:01:33瀏覽:25 寬帶DOA傅里葉變換空間重采樣性能分析wide-bandDOAFouriertransformspatialresampling

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      • Combinatorial analysis on spatial information statistics for the karst water environment in Guiyang,

        The karst groundwater system is extremely vulnerable and easily contaminated by human activities.To understand the spatial distribution of contaminants in the groundwater of karst urban areas and contributors to the contamination,this paper employs the spatial information statistics analysis theory and method to analyze the karst groundwater environment in Guiyang City,Based on the karst groundwater quality data detected in 61 detection points of the research area in the last three years,we made Kriging evaluation isoline map with some ions in the karst groundwater,such as SO42,Fe3+,Mn2+ and F,analyzed and evaluated the spatial distribution,extension and variation of four types of ions on the basis of this isoline map.The results of the analysis show that the anomaly areas of SO42-,Fe3+,Mn2+,F and other ions are mainly located in Baba'ao,Mawangmiao and Sanqiao in northwestern Guiyang City as well as in its downtown area by reasons of the original non-point source pollution and the contamination caused by human activities (industrial and domestic pollution)....

        2020-07-08 08:49:41瀏覽:20 karstwaterenvironmentspatialinformationstatisticsAnalysis

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      • Spatial Variation of P and N in Water and Sediments of Dianchi Lake, China

        Dianchi Lake is one of the most eutrophic lakes in China. In order to understand this eutrophication and to help control the pollution, this research investigated the spatial distribution of Kjeldahl nitrogen (K-N) and total phosphorus(TP) through analysis of bottom water and sediment (3 depths) samples collected at 118 sites around Dianchi Lake. The concentrations of K-N and TP for the lake bottom water in the Caohai part of the lake were much higher than those in the Waihai part, generally decreasing from north to south. In the sediments, the K-N concentration was higher in the Caohai part and the middle of the Waihai part. On the other hand, TP in the sediments was greater in the southern and western parts. Both K-N and TP had similar spatial distributions for the sediment samples of three different depths.Vertically, the K-N and TP concentration in the sediments decreased with an increase in depth. This was evidence that eutrophication and pollution of Dianchi Lake was becoming gradually more severe. Exterior factors including uncontrolled input of domestic and industrial effluents as well as non-point pollution around the lake were the main reasons for serious eutrophication; therefore, controlling these was the first step in reducing eutrophication of Dianchi Lake....

        2020-07-08 08:49:41瀏覽:18 nitrogenphosphorussedimentsspatialdistributionwater

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      • Multivariate analysis of surface water quality in the Three Gorges area of China and implications fo

        Multivariate statistical techniques,cluster analysis,non-parametric tests,and factor analysis were applied to analyze a water quality dataset including 13 parameters at 37 sites of the Three Gorges area,China,from 2003-2008 to investigate spatio-temporal variations and identify potential pollution sources.Using cluster analysis,the twelve months of the year were classified into three periods of lowflow (LF),normal-flow (NF),and high-flow (HF); and the 37 monitoring sites were divided into low pollution (LP),moderate pollution (MP),and high pollution (HP).Dissolved oxygen (DO),potassium permanganate index (CODMn),and ammonia-nitrogen (NH4+-N)were identified as significant variables affecting temporal and spatial variations by non-parametric tests.Factor analysis identified that the major pollutants in the HP region were organic matters and nutrients during NF,heavy metals during LF,and petroleum during HF.In the MP region,the identified pollutants primarily included organic matter and heavy metals year-around,while in the LP region,organic pollution was significant during both NF and HF,and nutrient and heavy metal levels were high during both LF and HF.The main sources of pollution came from domestic wastewater and agricultural activities and runoff; however,they contributed differently to each region in regards to pollution levels.For the HP region,inputs from wastewater treatment plants were significant; but for MP and LP regions,water pollution was more likely from the combined effects of agriculture,domestic wastewater,and chemical industry.These results provide fundamental information for developing better water pollution control strategies for the Three Gorges area....

        2020-07-08 08:49:41瀏覽:17 waterqualityspatialvariationsseasonalmultivariatestatistical

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      • 空間相關連續衰落信道下對角酉空時星座的最大似然多符號差分檢測算法

        空間相關性會造成MIMO系統的性能損失.針對這種空間相關性,大部分酉空時系統利用反饋信道將空間相關信息反饋給發射機,發射機通過有效利用該信息,進一步提高系統的性能.本文針對實際應用的另一種情形,當酉空時系統不存在反饋信道時,提出了空間相關連續衰落信道下,對角酉空時星座的最大似然多符號差分檢測算法.與傳統的準靜態信道模型相比,本算法基于連續衰落假設,是一種更一般的信道模型.計算機仿真結果表明:本算法可以在不明顯增加開銷的情況下,有效的提高空間相關連續衰落信道下對角酉空時星座的誤碼率性能....

        2020-03-23 19:13:54瀏覽:1387 空間相關差分酉空時調制最大似然多符號差分檢測spatialcorrelationdifferentialunitaryspace-time

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      • 基于統計信道狀態信息的有限反饋空分多址方法

        研究了在發送相關信道場景下,綜合利用統計信道狀態信息和瞬時信道狀態信息的多波束選擇算法.與傳統的基于碼本的傳輸方案不同,基于單信道質量標識反饋的多波束選擇算法利用統計信道狀態信息決定其最佳的波束矢量,每一時隙只反饋信道質量標識,而且該算法的性能與傳統方案基本相近.為了進一步提高平均和速率,提出了基于雙信道質量標識反饋的多波束選擇算法,該算法決定2個最佳統計特征方向,并且每時隙反饋雙信道質量標識.理論分析和仿真結果表明:基于雙信道質量標識反饋的多波束選擇算法可以增加多用戶分集和復用增益,具有更高的平均和速率....

        2020-03-23 19:06:41瀏覽:1396 空分多址統計信道狀態信息多用戶多輸入多輸出spatialDivisionmultipleaccessstatisticalchannel

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      [!--page.stats--] 被公玩弄的年轻人妻

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