2—（2，3，5—三氮唑偶氮）—1，8—二羟基—3，6—萘二磺酸与钴的显色反应及应用     

韩德满  蒋华江  叶巧云 《岩矿测试》2002,21(2):155-157

介绍了新水溶性显色剂 2 - ( 2 ,3,5 -三氮唑偶氮 ) - 1 ,8-二羟基 - 3,6-萘二磺酸与钴的显色反应及应用 ,建立了测定钴的新方法。在 pH 9.9的Na2 B4O7 NaOH缓冲液中该试剂与钴形成 1∶1蓝色稳定络合物 ,λmax为 5 88.8nm ,Co的质量浓度在 0～ 1 .0mg/L内符合比尔定律 ,表观摩尔吸光系数为 3.46× 1 0 4 L·mol- 1 ·cm- 1 。所拟方法用于环境水样及维生素B1 2 注射液中的微量钴测定 ,结果与原子吸收法相符 ,5次测定的RSD <1 %。  相似文献   

Self‐purification in Upland and Lowland Streams     

Ines Heidenwag  Uta Langheinrich  Volker Lüderitz 《洁净——土壤、空气、水》2001,29(1):22-33

Ecological investigations at four streams in Saxony‐Anhalt have shown that there are considerable differences between the self‐purification power of upland and lowland streams. This result is reflected in chemistry and in microbiology. The structure of the bottom substrate mainly influences the degree of self‐purification in connection with rate of flow and flow velocity. The results and differences are demonstrated using the example of Katzsohlbach in the landscape unit “Mittel‐ and Unterharz” and the stream Olbe in the landscape unit “Magdeburger Börde”.  相似文献   

Oxidation Experiment of Natural Megacrystal Clinopyroxene: Implications for Assignment of Mössbauer Spectra     

ZHI Xiachen  CHEN Peng  LIN Chengzhong  CHEN Shuqing  ZHANG Guilan  LI Yuzhi  LIN Lei 《《地质学报》英文版》2001,75(1):51-58

The Mössbauer spectra of natural megacrystal clinopyroxene are usually fitted by 4 sets of symmetric doublets, A‐A', B‐B', C‐C' and D‐D', respectively, in terms of increasing Qs value in literature. But the assignments of those doublets are quite different, except the D‐D' doublet assigned to Fe³⁺at the lattice site M***1 in previous papers. Particularly, the assignment and interpretation of the C‐C' doublet are diverse. The oxidation experiments of natural megacrystal clinopyroxene collected from the Hannuoba basalt, North China, were performed under controlled conditions of temperature at 1000°C and oxygen fugacity of FMQ buffer in 1, 2, ***3 and 5 days respectively. The oxidized samples were then measured by X‐ray diffraction spectrometry and Mössbauer spectrometry. The oxidation of clinopyroxene is characterized by Fe²⁺ → Fe³⁺at M1 under the subsolidus conditions, which is consistent with the increase of the area of the D‐D' doublet when the heating time increases. Accordingly, the area of the A‐A' and B‐B' doublets decreases with the increasing heating time. However, the area of C‐C' keeps almost constant. Therefore, the 4 sets of doublets can be assigned correctly as follows: A‐A' doublet to Fe⁺²at M1, B‐B' Fe²⁺at M1, C‐C' Fe²⁺at M2, and D‐D' Fe³⁺at M1. The M1 site splitting is due to the NNN (Next Nearest Neighbour) effect of the M2 site. The amount of Fe³⁺at the tetrohedral site of megacrystal clinopyroxene is negligible according to this study.  相似文献   

The use of sintered diamond anvils in the MA8 type high-pressure apparatus     

Tadashi Kondo  Hiroshi Sawamoto  Akira Yoneda  Manabu Kato  Akihito Matsumuro  Takehiko Yagi  Takumi Kikegawa 《Pure and Applied Geophysics》1993,141(2-4):601-611

A new multi-anvil type high-presure apparatus has been developed using sintered diamond anvils to generate pressures over 30 GPa and temperatures up to about 2000°C. A maximum sample volume of about 1 mm³ is available in this system. The pressure was confirmed by dissociation of forsterite into Mg-perovskite and periclase. The basic techniques and problems in utilizing sintered diamond in the MA8 type high-pressure apparatus are discussed with an emphasis on the future prospect of incorporating simultancous X-ray diffraction observation.  相似文献   

利用MODIS资料遥感水体上空气溶胶粒子尺度的数值试验   总被引：4，自引：4，他引：4  

冯建东  黄艇  陈长和  张武 《高原气象》2006,25(1):110-115

利用卫星探测辐射的光谱依赖性来反演大气气溶胶粒子尺度分布,首先要建立反演算法并检验其可行性。本文参照文献[1]对暗的海洋上空MODIS资料的处理方法,针对大陆水库上空卫星探测MODIS辐射信号,利用6S(Second Simulation of the Satellite Signal in the Solar Spectrum)辐射模式建立一个查算表(Look-up table:LUT)来反演大气气溶胶粒子尺度分布;然后通过数值试验对所建立的查算表进行检验,讨论其方法的可行性。数值试验结果表明,查算表对大陆性气溶胶尺度分布有反演能力,但拟合误差sεl值随着气溶胶光学厚度的增加而增加。  相似文献   

沙尘气溶胶对西北地区植被遥感的影响分析     

张杰  郭铌  郝志毅 《高原气象》2006,25(1):116-122

选取扬沙—浮尘天气发生中、后的对地观测卫星EOS-MODIS数据,利用6S辐射传输模式对该卫星资料进行大气订正,分析了沙尘气溶胶对沙尘多发区的西北地区植被指数(VI)遥感的影响。结果表明,与晴空天气得到的反射率相比,沙尘使红光通道反射率ρ1、近红外通道反射率ρ2和蓝光通道反射率ρ3均增加,归一化植被指数NDVI有不同程度的降低,降低最大值为0.246。抗大气植被指数ARVI也有所降低,降低最大值为0.231。应用晴空天气条件下的资料,建立了西北干旱区ARVI与NDVI之间的线性关系,并证明了在沙尘天气条件下,利用ARVI计算NDVI的方法,所得的结果较好。  相似文献   

利用IRS-P6卫星数据制作遥感影像地图     

张幼莹 《国土资源信息化》2006,29(1):30-32,5

本文介绍了以IRS-P6卫星数据作为信息源完成大兴安岭林区的遥感影像地图制作的方法, 通过试验初步认识到:利用IRS-P6卫星数据制作遥感影像地图,可以满足1:50000、 1:25000比例尺的平面制图精度要求,在一些专业和专题应用中可以放大到1:15000比例尺使用。  相似文献   

Rational function model for sensor orientation of IRS-P6 LISS-4 imagery     

V. Nagasubramanian    P. V. Radhadevi    R. Ramachandran    R. Krishnan 《The Photogrammetric Record》2007,22(120):309-320

  相似文献   

西昌邛海泸山旅游地质资源特征   总被引：1，自引：0，他引：1  

尤显贤 《四川地质学报》1998,(3)

西昌邛海、泸山山水浑然一体,以其邛池夜月、碧波朝阳、渔村夕照、平湖秋月、三教合一寺庙群落同建于山中一道路上而闻名遐迩。邛海、泸山旅游资源十分丰富,种类齐全,并以四川省第二大天然湖泊优势,独特气候而名满天下。  相似文献   

湖泊水位资料与模型模拟恢复的6000年前全球湿润状况的对比研究     

秦伯强  于革  SandyPHarison 《气象学报》1998,56(3):272-283

本项研究是ＰＭＩＰ（ＰａｌａｅｏｃｌｉｍａｔｅＭｏｄｅｌｉｎｇＩｎｔｅｒｃｏｍｐａｒｉｓｏｎＰｒｏｊｅｃｔ）国际合作项目中有关模型模拟与观测资料对比的一部分。模型试验对象是６０００ｙｒ．ＢＰ的全球湿润状况。模拟试验以检测太阳辐射变化对全球大尺度气候系统的影响为主要目的。观测资料是利用地质证据恢复的古湖泊水位变化,实际上是某一地区的有效降水（降水减蒸发）的变化。通过两者的比较发现,所有模拟试验均能重现６０００ｙｒ．ＢＰ在亚洲南部与非洲北部的湿润环境,从而证实了因太阳辐射变化导致的亚洲与非洲季风的增强。但模拟的季风增强无论是强度还是范围均小于地质记录。原因很可能是模拟试验中下垫面特征用“现代”的来处理。模拟试验对北半球夏季辐射增加造成的西风带北移及由此引起的中纬度地区的气候变化不够成功。绝大多数模拟对受洋流与海温影响较大的地区是失败的。主要原因可能是所有ＰＭＩＰ中的模拟试验都未考虑海洋的作用。  相似文献