人工合成硅灰石的发光性质与发光机理的初步研究   总被引：2，自引：0，他引：2  

袁曦明  何应律 《地球科学》1994,19(2):175-180

在２５４ｎｍ紫外光照激发条件下，对人工合成掺入不同激活离子的低温ＴＣ型和高温型假硅灰石的发光性质进行了实验测定，从微观原子能量谱项讨论了在全的硅灰石基质中Ｅｕ＾３＋和Ｇｄ＾３＋的发光机理，分析了Ｂｉ＾３＋对Ｅｕ＾３＋与Ｐｂ＾２＋对Ｍｎ＾２＋的敏化发光条件，初步探讨了掺放Ｅｕ＾３＋的高温型假硅灰石发光强度减弱的原因。  相似文献   

离子交换与吸附研究方法   总被引：2，自引：0，他引：2  

张绍成 《盐湖研究》1994,2(1):74-81

综合文献资料，结合本人研究实践，对离子交换与吸附研究的一些方法做专门介绍．  相似文献   

线性规划在徐州地下水资源开发中的应用   总被引：1，自引：0，他引：1  

陈爱光  陈国富 《地球科学》1985,(1)

本文从地下水系统的观点出发,对徐州地区中寒武统—中奥陶统碳酸盐岩地下水系统进行了分析。并应用线性规划的原理和方法对徐州市西郊四个水源地地下水进行了水文地质计算。在规定水位允许降深的约束条件下,求得至2000年,该区地下水最大开采量为14万米~3/天及各水源地相应取水量的最佳分配。文中采用特定条件图解法计算多边界、多主井抽水干扰影响的方法,具有通用意义。  相似文献   

Aspects of the cycle of inorganic nitrogen compounds in the tropical rain forest of the Ivory Coast     

Jean Servant  Robert Delmas  Jacques Rancher  Marcel Rodriguez 《Journal of Atmospheric Chemistry》1984,1(4):391-401

A partial balance of mineral N is given for the basins of two coastal rivers in a forest zone in the Ivory Coast. The dry and wet depositions on the basin surfaces is given for particulate matter (NO₃ ^–, NH₄ ⁺). The quantity of mineral N washed away in the rivers is evaluated. The losses from leaching of the soils by rainwater are about 0.33 to 1.0% of the atmospheric depositions for NH₄ ⁺–N and 2.2 to 5.8% for NO₃ ^––N. The yearly atmospheric input of N compounds to the ecosystem, about 1.4 g N m^–2 y^–1, is at least 14% of mineral N formed in the soils and is therefore quite significant.  相似文献   

离子刻蚀全息光栅的研究     

沈邦兴  李开新  张谊萍 《武汉大学学报(信息科学版)》1987,(1)

利用国产的光刻胶和国产离子刻蚀机在蒸镀的铝基衬底上进行刻蚀全息光栅,在国内是一项较新的技术。本文介绍和论述了该试验工作的工艺过程、参数计算和测试方法,得出了试验结果和参数计算值基本吻合的结论,并指出了进一步改善质量的方向。  相似文献   

Gas chromatographic determination of peroxyacetyl nitrate: Two convenient calibration techniques     

Horst Meyrahn  Günter Helas  Peter Warneck 《Journal of Atmospheric Chemistry》1987,5(4):405-415

Two procedures for the calibration of an electron capture detector (ECD) for peroxyacetyl nitrate (PAN) are discussed. One is based on the first-order decay rate of the the PAN mixing ratio in conditioned glass storage vessels. The other method makes use of the photochemical generation of PAN in mixtures of acetone and NO₂ in air. For this purpose a Penray Hg lamp was inserted into a glass vessel filled with 1 atmosphere of air containing 10 ppm NO₂ and 1% acetone. After 3 min of irradiation, the average PAN mixing ratio formed was 8.87±0.25 ppmv as determined in six separate runs.  相似文献   

Quantitative chemical characterization of vitrinite concentrates using pyrolysis-gas chromatography. Rank variation of pyrolysis products     

J.T. Senftle  S.R. Larter  B.W. Bromley  J.H. Brown 《Organic Geochemistry》1986,9(6)

A series of hand-picked vitrinite samples from the Lower Kittanning Seam, Pennsylvania have been examined using quantitative pyrolysis-gas chromatography. These vitrinites ranged in rank from 0.59 to 1.71% reflectance, a rank range from high volatile C bituminous to low volatile bituminous. High molecular weight pyrolysis products included alkyl aromatic and phenolic compounds. Attempts have been made to correlate the pyrolysis product composition to rank parameters including vitrinite reflectance, volatile matter yield, carbon content, atomic H/C ratio and Rock-Eval determined T_max. Total yield of phenols was found to be strongly and inversely rank related. A clear relationship between C₈ alkyl-benzene yield and rank was not found for the sample set.  相似文献   

The effect of the Mt St Helens eruption on tropospheric and stratospheric ions   总被引：1，自引：0，他引：1  

Y. Kondo  R. Reiter  H. Jäger  M. Takagi 《Pure and Applied Geophysics》1982,120(1):11-17

Balloon-borne observations of electrical conductivity in the troposphere and stratosphere were performed using conductivity sondes at Garmisch-Partenkirchen, West Germany, from June to November, 1980, after the Mt St Helens eruption. A significant decrease of atmospheric ions in the altitudes from the troposphere to lower stratosphere has been detected until several months after the eruption in comparison with the observational results obtained before the eruption. Simulteneous ruby lidar observation a month after the eruption indicates an increased amount of aerosol at nearly the same altitude as that of conductivity decrease. Several months after the eruption it appears that aerosols detected by lidar and those effective in reducing ion concentration have different profiles.  相似文献   

箱法在草地温室气体通量野外实验观测中的应用研究   总被引：31，自引：0，他引：31  

杜睿  王庚辰  吕达仁  孔琴心  刘广仁  万小伟  张斌  王艳芬  季保明 《大气科学》2001,25(1):61-70

利用静态箱法采样,配以气相色谱仪法分析对草地N2O、CH4和CO2温室气体通量进行了较系统的现场测量,同时对箱体内外温度进行同步观测。在对野外原位观测实验数据进行定量分析的基础上,论证了静态箱法对草原土壤-植被系统的N2O、CH4和CO2通量测量的适用性和科学性,讨论了实验结果的可靠性。  相似文献   

利用AutoPrep技术抑制型电导离子色谱法检测土壤中碘     

刘肖  史亚利Archava Siriraks Mike Kinderman 《岩矿测试》2007,26(6):446-450

利用AutoPrep自动样品前处理技术，对土壤燃烧吸收液进行在线预浓缩，抑制型电导进行检测，建立了一种全新思路的检测土壤样品中碘的方法。选择亲水性非常强的氢氧化物选择性IonPac AS16阴离子交换色谱柱，淋洗液发生装置在线产生KOH进行等梯度淋洗，抑制型电导检测。结果表明，对于土壤燃烧吸收液中碘离子的测定，方法检出限（S／N=3）可达1．2μg/L，线性相关系数为0．9998，方法精密度（RSD，n=7）为1．161％～4．566％，回收率在90．6％～100．8％。采用AutoPrep电导检测和脉冲安培检测离子色谱法测定不同土壤样品中的碘，两种方法的检测结果基本一致。方法在提供了稳定的系统空白的同时，还具备自动化程度高、操作简单、重现性好、灵敏度高、系统稳定、节约时间、成本低廉和对环境友好等多方面特点，适合于大批量土壤普查中碘的分析。  相似文献