基于XML影像数据搜索算法的研究     

梁建飞  徐峰  周华  张军臣 《测绘与空间地理信息》2021,44(1):152-155

从海量影像数据中查找所需数据是正射影像制作中的一个重要步骤,本文利用天绘影像提供的XML文件自动提取坐标信息,根据图号自动计算图幅角点坐标,研究了自动识别点和面位置关系的算法,实现了根据图号自动搜索天绘影像数据,根据天绘影像数据自动搜索参考影像数据的功能。  相似文献   

Growth Rates of Global Energy Systems and Future Outlooks   总被引：1，自引：0，他引：1  

Mikael H??k  Junchen Li  Kersti Johansson  Simon Snowden 《Natural Resources Research》2012,21(1):23-41

The world is interconnected and powered by a number of global energy systems using fossil, nuclear, or renewable energy. This study reviews historical time series of energy production and growth for various energy sources. It compiles a theoretical and empirical foundation for understanding the behaviour underlying global energy systems’ growth. The most extreme growth rates are found in fossil fuels. The presence of scaling behaviour, i.e. proportionality between growth rate and size, is established. The findings are used to investigate the consistency of several long-range scenarios expecting rapid growth for future energy systems. The validity of such projections is questioned, based on past experience. Finally, it is found that even if new energy systems undergo a rapid ‘oil boom’-development—i.e. they mimic the most extreme historical events—their contribution to global energy supply by 2050 will be marginal.  相似文献   

山区暖带的农业生态效应——以秦岭-黄淮平原交界带为例     

刘军臣  安士伟 《山地学报》1998,(4)

分析了山区暖带对当地农业生态环境的影响和暖带资源利用中应注意的若干问题．  相似文献   

且干布拉克蛭石的矿物学研究   总被引：4，自引：2，他引：4  

许荣旗  曹俊臣 《矿物学报》1993,13(1):37-45

本文对产于新疆且干布拉克的我国最大蛭石矿的组成、结构和谱学特征做了系统的阐述。研究表明:且干布拉克蛭石是由金云母风化而成。由于风化的不完全,该蛭石保留了许多金云母的特征。该蛭石不是个严格矿物学意义上的蛭石,它是由金云母、严格矿物学意义上的蛭石、以及两者组成的多种混层矿物的混合物。金云母风化过程中可能有杂质铁相生成。蛭石的颜色和多色性,可能起因于其中的O~(2-)→Fe~(2+23+)和Fe~(2+)→Fe~(3+)  相似文献   

黄淮地区月极端气温概率模型研究   总被引：1，自引：1，他引：0  

刘军臣  王君 《气象与环境科学》2000,(2):15-16

利用黄淮地区 1 4个国家基本 (准 )站 1 951～ 1 993年的月极端气温资料序列 ,分别进行了正态、Gumbel、Weibell概率分布拟合试验。根据拟合检验值和误差 ,确定了各站月极端最高气温和极端最低气温的概率分布模型  相似文献   

Chinese Contribution to CMIP5：An Overview of Five Chinese Models’Performances   总被引：4，自引：0，他引：4       下载免费PDF全文

ZHOU Tianjun  CHEN Xiaolong  DONG Lu  WU Bo  MAN Wenmin  ZHANG Lixi  LIN Renping  YAO Junchen  SONG Fengfei  ZHAO Chongbo 《Acta Meteorologica Sinica》2014,28(4):481-509

An overview of Chinese contribution to Coupled Model Intercomparison Project-Phase 5 （CMIP5） is presented. The performances of five Chinese Climate/Earth System Models that participated in the CMIP5 pro ject are assessed in the context of climate mean states, seasonal cycle, intraseasonal oscillation, interan-nual variability, interdecadal variability, global monsoon, Asian-Australian monsoon, 20th-century historical climate simulation, climate change pro jection, and climate sensitivity. Both the strengths and weaknesses of the models are evaluated. The models generally show reasonable performances in simulating sea surface tem-perature （SST） mean state, seasonal cycle, spatial patterns of Madden-Julian oscillation （MJO） amplitude and tropical cyclone Genesis Potential Index （GPI）, global monsoon precipitation pattern, El Ni-no-Southern Oscillation （ENSO）, and Pacific Decadal Oscillation （PDO） related SST anomalies. However, the perfor-mances of the models in simulating the time periods, amplitude, and phase locking of ENSO, PDO time periods, GPI magnitude, MJO propagation, magnitude of SST seasonal cycle, northwestern Pacific mon-soon and North American monsoon domains, as well as the skill of large-scale Asian monsoon precipitation need to be improved. The model performances in simulating the time evolution and spatial pattern of the 20th-century global warming and the future change under representative concentration pathways pro jection are compared to the multimodel ensemble of CMIP5 models. The model discrepancies in terms of climate sensitivity are also discussed.  相似文献   

中医古籍中驻颜处方的内服法及用药规律探析          下载免费PDF全文

万玉凯  杨羽静  邱俊琛 《应用海洋学学报》2024,40(4):32

目的：探讨中医古籍中驻颜处方的内服法及用药规律。方法：收集整理中医智库·数字图书馆中具有驻颜功效的中医古籍处方,采用Microsoft Excel 2016软件对筛选出的方剂剂型、辅料、送服介质、送服温度等进行频次统计,归纳总结用药规律。结果：最终纳入112首古籍处方,涉及282味中药。高频中药以温性、甘味的补虚药为主,归经以肾经为主;剂型以丸剂为主;使用辅料总频次为123次,其中蜂蜜、酒、麦芽最为常见;送服介质共21种,总频次达159次,其中频次最高的为酒（82次）;送服温度以温服为主。通过聚类分析、关联规则可以得出聚类方3组及药对组合15对。结论：驻颜处方多见以补虚药为主,尤以补肝肾药物相对较多,且以温酒丸剂内服效果较佳。  相似文献   

The impact of land surface temperatures on suprapermafrost groundwater on the central Qinghai-Tibet Plateau     

Kewei Huang  Junchen Dai  Genxu Wang  Juan Chang  Yaqiong Lu  Chunlin Song  Zhaoyong Hu  Naveed Ahmed  Renzheng Ye 《水文研究》2020,34(6):1475-1488

  相似文献   

区域海气耦合模式FROALS的发展及其应用     

周天军  邹立维  韩振宇  刘博  姚隽琛 《大气科学》2016,40(1):86-101

区域海气耦合模式是研究局地海气相互作用过程影响气候变率的重要平台,也是对全球气候模式进行"动力降尺度"的重要工具.本文介绍了LASG(State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics)/IAP(Institute of Atmospheric Physics)发展的区域海气耦合模式FROALS(Flexible Regional Ocean-Atmosphere-Land System model),并总结了过去五年围绕该区域海气耦合模式开展的研究工 作.FROALS的特点之一是有两个完全不同的大气模式分量和海洋模式分量选项,可以适应不同的模拟研究需 求.针对区域海气耦合模式在西北太平洋地区的模拟偏差,通过分步骤考察不同大气模式分量和不同海洋模式分量对模式模拟性能的影响,指出大气模式是导致区域海气耦合偏差的主要分量.通过改进对流触发的相对湿度阈值标准,有效地改善了此前区域海气耦合模式在亚洲季风区普遍出现的"模拟海温冷偏差".改进的FROALS对西北太平洋地区的大气和海洋环境有较好的模拟能力,合理地再现了西北太平洋地区表层洋流气候态和年际变率.较之非耦合模式,考虑区域海气耦合过程后,改进了东亚和南亚地区的降水和热带气旋潜势年际变率的模拟.最后,针对东亚—西北太平洋地区,利用FROALS对IAP/LASG全球气候模式模拟和预估的结果进行了动力降尺 度,得到了东亚区域50 km高分辨率区域气候变化信息.分析显示,FROALS模拟得到的东亚区域气候较之全球气候模式和非耦合区域气候模式结果具有明显的"增值",显示出区域海气耦合模式在该区域良好的应用前景.  相似文献   

Numerical Modelling of Ore-forming Dynamics of Fractal Dispersive Fluid Systems   总被引：9，自引：0，他引：9  

DENG Jun  FANG Yun  YANG Liqiang  YANG Junchen  SUN Zhongshi  WANG Jianping  DING Shijiang  WANG QingfeiChina University of Geosciences  Beijing China University of Geosciences  Wuhan Institute of Geology  Geophysics  Chinese Academy of Sciences  Beijing Jilin University  Changchun 《《地质学报》英文版》2001,75(2):220-232

Based on an analysis of the fractal structures and mass transport mechanism of typical shear-fluid-ore formation system, the fractal dispersion theory of the fluid system was used in the dynamic study of the ore formation system. The model of point-source diffusive illuviation of the shear-fluid-ore formation system was constructed, and the numerical simulation of dynamics of the ore formation system was finished. The result shows that: (1) The metallogenic system have nested fractal structure. Different fractal dimension values in different systems show unbalance and inhomogeneity of ore-forming processes in the geohistory. It is an important parameter to symbolize the process of remobilization and accumulation of ore-forming materials. Also it can indicate the dynamics of the metallogenic system quantitatively to some extent. (2) In essence, the fractal dispersive ore-forming dynamics is a combination of multi-processes dominated by fluid dynamics and supplemented by molecule dispersion in fluids and  相似文献