Evaluating Vegetation Health Condition Using MODIS Data in the Three Gorges Area, China

The satellite-based vegetation condition index (VCI) and temperature condition index (TCI) have been used extensively for drought detection and tracking, the assessment of weather impacts on vegetation and evaluation of the health and productivity of vegetation. In this study, in order to detect and monitor the growth condition of vegetation, we have collected data on vegetation indices and land surface temperature derived from MODIS (2001-2012) and defined a vegetation health index (VHI) based on VCI and TCI for assessing vegetation health condition in the Three Gorges Area, China (TGA). The results of the study show that temporal and spatial characteristics of vegetation health condition can be detected, tracked and mapped by the VHI index. In most parts of the TGA, the vegetation health condition showed an overall increasing trend during the study period, especially in Wulong, Fengdu, Shizhu and other regions located in the midstream sections of the Three Gorges Reservoir. In addition, the four studied vegetation types all showed clear increasing trends during the study period. The increasing trend in the vegetation health condition shows a strong positive correlation with topographical slope and altitude (below 500 m). Over the seasons, this trend is strongest in autumn, followed by spring. However, the correlations between vegetation health condition and climatic factors are more frequently significant in summer and winter than in autumn and spring. The vegetation health condition has been low in 2006 and 2011. This finding is consistent with the extreme weather conditions in those two years. However, only in the summer is vegetation health condition significantly correlated with three climatic factors in most of the study area. This result implies that vegetation growth may show a lagged response to climatic factors and may also be affected by human activities, including agricultural activities, industrial activities and other economic activities.     

增产丙烯、多产异构化烷烃的清洁汽油生产技术(MIP-CGP)在催化裂化装置上的应用

九江分公司于2004年7月采用MIP-CGP技术对重油催化裂化装置进行改造,并投产成功。通过对装置运行情况的分析,证实了MIP-CGP工艺技术在催化裂化装置上应用的可行性,达到了增产丙烯和生产清洁汽油的目的。     

溶剂脱沥青-脱油沥青气化-脱沥青油催化裂化组合工艺研究及应用

介绍了渣油溶剂脱沥青-脱油沥青气化-脱沥青油催化裂化组合工艺的研究及应用情况.该组合工艺的应用提高了企业的劣质渣油加工能力,改善了产品结构,提高了企业的经济效益.     

铸钢用新型醇基涂料的研制与应用

本文根据生产需求,采用了国内外一些稳定性好的材料,应用胶体磨多功能合成研磨等新工艺,采用微机监控,并经逐步完善,成功地试制出了铸钢件专用新型涂料.     

重油催化裂化装置MGD技术工业应用

中国石化九江分公司Ⅱ套催化裂化装置应用MGD技术使催化汽油烯烃含量降低了约8个单位,同时增产了液化气和柴油,效果显著,达到了预期目的。     

阴极保护技术在三相分离器内壁保护中的应用

1三相分离器的腐蚀类型及腐蚀机理三相分离器是油、气、水分离的主要设备,其罐壁的二分之一以下部位与水介质接触,二分之一以上部位与油、气接触。顶部气相接触部位轻度点蚀;油相接触部位较轻;油水交界处沟槽腐蚀严重;水相接触部位为片状腐蚀和坑蚀。(1)水介质接触部位的腐蚀机     

正极材料Li_(1-4x)Ti_xFePO_4的合成和电化学性能

采用碳热还原法制备了锂离子电池正极材料Li1-4xTixFePO4(x=0、0.005、0.010、0.015、0.020和0.025).采用XRD、SEM、交流阻抗、恒流充放电及循环伏安等方法,研究了材料的结构和电化学性能.Li0.94Ti0.015FePO4的性能较好,0.2 C首次放电比容量为124.02 mAk/g,循环30次后的容量保持率为96.44%.     

流变相法制备的Li_(1+x)MnO_(1.92)F_(0.08)的性能

采用流变相法制备了Li1+xMnO1.92F0.08(x=0、0.05、0.10和0.20).在800 ℃、氮气保护下煅烧8 h制备的产物中,LiMnO1.92F0.08和Li1.05MnO1.92F0.08有完整的正交层状结构,Li1.10MnO1.92F0.08和Li1.20MnO1.92F0.08有Li2MnO3和Li2Mn2O4杂质.以0.2 C放电,Li1.05MnO1.92F0.08的最大放电比容量为157.85 mAh/g,第30次循环的比容量为157.15 mAh/g.     

高温固相法制备LiMnO2及其掺杂改性

采用高温固相法合成了正交LiMnO2及其掺杂改性的LiMnO2 and Li1.08MnO1.92F0.08和Li1.08Al0.0625Mn0.9375O1.92F0.08正极材料。通过X射线衍射对材料的晶体结构进行了分析,通过扫描电镜对材料的表面形态进行了分析,通过恒电流充放电和电化学阻抗测试技术对材料的电化学性能进行了测试。实验结果表明,LiMnO2 and Li1.08MnO1.92F0.08、Li1.08Al0.0625Mn0.9375O1.92F0.08的结构比未掺杂的LiMnO2表现出较少的阳离子混排和跺堆层错,其中材料Li1.08Al0.0625Mn0.9375O1.92F0.08的电化学性能最佳,该材料以0．2C的倍率循环充放电,最大放电比容量可达129．28mAh／g,50次循环后放电比容量仍保持在124．26mAh／g以上,容量保持率为96．12％。     

相变储能保温砂浆的制备、性能与应用研究

介绍了相变储能保温砂浆的制备方法,探讨了不同因素对各项性能的影响。研究结果表明：加入相变材料月桂酸对砂浆的抗压和抗折强度有一定影响,且随着相变材料用量的增大,力学强度减小越多。 SEM结果表明月桂酸与膨胀珍珠岩能够很好的融合。应用研究结果表明相变材料具有较显著的调温控温作用,这一成果可为相变材料在实际工程中的应用提供技术支持。