钽钼酸—丁基罗丹明B—PVA体系光度法测定痕量钽   总被引：1，自引：0，他引：1  

罗宗铭  梁洁贞 《岩矿测试》1991,10(2):89-92

Ta(V)与钼酸盐在pH3.7形成钽钼酸,并在0.29mol/L的H_2SO_4介质中,与丁基罗丹明B(BRHB)形成离子缔合物,其组成比为Ta:Mo:BRHB=1:6:3。有聚乙烯醇(PVA)存在时,该缔合物能稳定存在于水溶液中。缔合物的最大吸收在588nm,ε_(588)=3.62×10~5L·mol~(-1)·cm~(-1),Ta在0—5μg/25ml范围符合比尔定律。方法应用于硅酸盐岩石中痕量Ta的测定,结果满意。  相似文献   

GMS双光谱云图云分类微机处理系统     

郁凡  张培昌 《南京气象学院学报》1992,15(1):96-102

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Active and laboratory experiments in space plasma physics     

Walter Gekelman 《Surveys in Geophysics》1995,16(3):457-485

This report focuses on active experiments in space as well as laboratory experiments which are directly related to space phenomena. The active experiments involve particle releases in the CRESS and AMPTE missions. Unexpected results such as the motion of the plasma triggered several interesting computer simulations and a laboratory experiment which will be reviewed. Critical Ionization Phenomena will be discussed in this context. A recent release over Arecibo was used to create a plasma lens to focus radiation from the HF heater beam. The higher power triggered several nonlinear processes. Advances in plasma sources and diagnostics have made it possible to scale many laboratory experiments. Discussed here are experiments on Alfvén waves generated by a localized source, 3D magnetic field line reconnection, three dimensional magnetized double layers and simulations of a tethered satellite.  相似文献   

Topography and geology of Hyperion     

Philip J. Stooke 《Earth, Moon, and Planets》1996,74(1):61-83

I have mapped the Saturnian satellite Hyperion using Voyager 2 images obtained in 1981 and a shape model derived from the results of Thomas et al. (1995). The results are presented in tabular and graphic form, including detailed shaded relief maps of the satellite. The shape is approximated by a triaxial ellipsoid with axes of 270, 201 and 336 km. The volume is estimated to be 9.5 ± 2.0 × 10⁶ km³. Geological interpretations were augmented by the use of super-resolution image composites. The surface is heavily cratered. A system of scarps and an isolated mountain are interpreted as the rim and central peak of an impact crater with a diameter similar to the mean diameter of the satellite itself, the largest crater with recognizable impact morphology in relation to the size of the body yet observed in the solar system. The crater density dates that impact, not the formation of Hyperion. Grooves are identified in several images, and form part of a zone of fracturing radial to a prominent crater.University of Western Ontario  相似文献   

北斗和遥感技术在特高压交流输变电工程地质灾害预警中的应用研究     

张书豪  董四清  罗兆楠  毛锋 《地理信息世界》2016,(3):97-102

本文研究了基于我国北斗卫星导航系统和高分遥感技术进行特高交流输变电施工中地质灾害预警的理论和方法,该方法还将北斗卫星导航技术、遥感技术与特高压施工区的地质、气候、环境等多重因素相综合,形成了一套针对特高压交流输变电工程的地质灾害预警与防范机制,并开发手机APP预警信息发布功能。锡盟~山东特高压交流输变电工程施工实践证明,本文的理论技术方法是科学和实用的。  相似文献   

基于NDVI时间序列影像的张掖市农作物种植结构提取   总被引：1，自引：0，他引：1  

程良晓  江涛  谈明洪  肖兴媛 《地理信息世界》2016,(4):37-44

HJ卫星(环境与灾害监测预报小卫星)数据具有较高的时间和空间分辨率,可以有效地进行农作物种类识别,利用其时间序列数据进行作物信息提取具有很大优势。以甘肃省张掖市为研究区,利用2012年4月~2012年10月15个时相的HJ卫星CCD(电荷耦合元件,charge-coupled device)数据,通过分析玉米、油菜、大麦和小麦农作物在整个生长阶段的时间序列NDVI(归一化植被指数,normalized difference vegetation index)变化特点,提取四类农作物NDVI随时间变化的特征曲线,利用决策树分类方法,对2012年张掖市农作物进行分类,并以外业调查得到的实际地面验证点对分类结果进行验证。验证结果表明,可以有效地识别玉米、油菜、大麦和小麦4类农作物,制图精度分别为94.74%、82.35%、78.95%和90%;总体分类精度达到86.43%。而后提取了张掖市2014年农作物种植面积和分布格局,通过对比分析发现,2012~2014年,张掖市玉米、油菜的种植面积有不同程度的增加,大麦和小麦的种植面积各有一定程度的较少。可以为张掖市主要作物的种植结构调整提供科学依据,还可以为黑河流域农作物信息提取研究提供参考。  相似文献   

FY3地面业务系统关键信息短信报警平台的设计及实现     

田思维  屈兴之  张媛媛  赵现纲  谢利子 《气象科技》2016,44(6):907-912

FY3卫星地面业务系统关键信息短信报警平台为高可靠极轨业务系统运行提供了保障。从报警监视关键监视点的选取、轨道接收圈的智能判别,平台报警信息的处理以及保证软件的高时效性出发,讨论了FY3卫星轨道可能出现的情况,提出了两种判别算法并进行了取舍。针对平台报警信息处理以及保证软件高时效性,对FY3卫星的接收时间特性进行了分析并基于此设计报警短信过滤逻辑及基本软件结构。该平台已在实际工程中应用并取得了良好效果,本文最后给出了运行统计数据。  相似文献   

河南省县级综合气象业务平台的建设及应用   总被引：1，自引：0，他引：1  

艾艳  孙景兰  范学峰 《气象与环境科学》2016,39(1):114-119

河南省气象局组织开发的以标准化、规范化、统一数据环境和信息网络为支撑,集气象综合观测、气象预警预报、公共气象服务、农业气象服务、一键式发布和业务管理为一体的"河南省县级综合气象业务平台",为县级综合气象业务的开展提供集约高效的工作平台,为加快基层气象业务现代化建设、全面推进县级气象机构综合改革提供坚实的支撑。平台采用集约化的数据环境和B/S架构,利用跨平台的Java语言开发,采用开源框架结构设计,平台的运维在省级信息中心,减轻了基层业务人员的运维工作量。  相似文献   

四种卤代PTP1B抑制剂的化学合成及其活性研究     

王保程  王立军  江波  杨猛  史大永 《海洋科学》2016,40(12):56-61

从松节藻中分离的含卤素化合物表现出显著PTP1B抑制活性。其中BPN效果最佳。为研究BPN侧链基团极性对其抑制活性的影响,本文以香兰素(1)为起始原料,经过溴代、氧化、还原、傅克烷基化以及酯化等反应,成功合成了新化合物2,3-二溴-1-(2-溴-3,4-二甲氧基-6-((4-硝基苯氧基)甲基)苯甲基)-4,5-二甲氧基苯(10)、4-((3-溴-2-(2,3-二溴-4,5-二甲氧基苄基)-4,5-二甲氧基苄基)醚)苯胺(11)、4-((3-溴-2-(2,3-二溴-4,5-二甲氧基苄基)-4,5-二甲氧基苄基)醚)-4-乙酰乙酸(12)和3-溴-2-(2,3-二溴-4,5-二甲氧基苄基)-4,5-二甲氧基苯甲醛肟(14)。通过1 H-NMR,13C-NMR等方法对目标产物进行了结构表征。并对化合物进行了PTP1B酶抑制活性的测定,结果表明化合物侧链极性对PTP1B酶抑制活性有显著影响。  相似文献   

Intercomparison of High-Resolution Bay of Bengal Circulation Models Forced with Different Winds     

Atul Srivastava  Suneet Dwivedi  Alok Kumar Mishra 《Marine Geodesy》2016,39(3-4):271-289

The high-resolution Bay of Bengal circulation modeling in the region [80E–95E; 5N–22N] is performed with a horizontal resolution of 10 km and the highest vertical resolution of 5 m near the surface. The intercomparison experiments, with ocean model forced with the near-surface (1) National Centers for Environmental Prediction (NCEP) reanalysis winds and (2) blended seawinds data (a combination of remotely sensed scatterometer and in situ observations) are carried out for a period of 17 years during 1998–2014. The seasonal variability of the realistically simulated surface hydrographic (temperature and salinity) and circulation (currents) variables from both the experiments is compared and contrasted with the observational data. The mixed layer depth seasonal variability of the region is also studied. The mesoscale features of currents at 50 and 100 m are also studied. The volume transport across different sections in the Bay of Bengal is computed and its relation with summer monsoon rainfall is investigated. The results suggest that there is no real advantage of using high-resolution blended seawinds over the much coarser NCEP reanalysis winds.  相似文献