(Sr_(0.1)Ca_(0.9))_(0.97)TiO_3∶Eu_(0.03)~(3+)荧光粉掺杂复合发光玻璃的制备与研究

玻璃具有透明、耐腐蚀等优点,是一种良好的基质材料。本文选用了TeO_2-ZnO、Bi_2O_3-ZnO-B_2O_3两种低熔点玻璃基体,掺杂(Sr_(0.1)Ca_(0.9))_(0.97)TiO_3∶Eu_(0.03)~(3+)荧光粉制备复合发光玻璃。研究表明,荧光粉在玻璃基体中的分散均匀性也受多种因素限制;荧光粉掺入玻璃基体中,受玻璃本身光散射的影响,发光性能受到了较大的限制。复合玻璃发光强度随着荧光粉掺杂量的增加而升高,但掺杂量超过一定值后,发光性能反而降低。掺杂量增加到一定程度时,得到的产物是烧结态陶瓷结构,其结构的变化降低了发光性能。对比TeO_2-ZnO、Bi_2O_3-ZnO-B_2O_3两种玻璃基体,TeO_2-ZnO玻璃与(Sr_(0.1)Ca_(0.9))_(0.97)TiO_3∶Eu_(0.03)~(3+)荧光粉有更好的匹配性。     

三元共聚物阻垢分散剂的合成及阻垢性能研究

合成了一系列丙烯酸─丙烯酸甲酯─丙烯酰胺阻垢分散剂，研究了共聚物浓度、钙离子浓度、水质ｐＨ值、温度及恒温时间对阻垢性能的影响。研究结果表明：该阻垢分散剂对碳酸钙、硫酸钙、磷酸钙具有较优异的阻垢性能，且对循环水硬度、ｐＨ值及温度适用范围广，可广泛用作工业循环冷却水的阻垢分散剂。     

Exact analytical expressions and numerical analysis of two-center Franck-Condon factors and matrix elements over displaced harmonic oscillator wave functions

A detailed study is undertaken, using various techniques, in deriving analytical formula of Franck-Condon overlap integrals and matrix elements of various functions of power (xl), exponential (exp(−2cx)) and Gaussian (exp(−cx²)) over displaced harmonic oscillator wave functions with arbitrary frequencies. The results suggested by previous experience with various algorithms are presented in mathematically compact form and consist of generalization. The relationships obtained are valid for the arbitrary values of parameters and the computation results are in good agreement with the literature. The numerical results illustrate clearly a further reduction in calculation times.

Program summary

Program name:FRANCKCatalogue identifier:ADXX_v1_0Program summary URL:http://cpc.cs.qub.ac.uk/summaries/ADXX_v1_0Program obtainable from: CPC Program Library, Queen's University of Belfast, N. IrelandProgramming language:Mathematica 5.0Computer:Pentium M 1.4 GHzOperating system:Mathematica 5.0RAM:512 MBNo. of lines in distributed program, including test data, etc.:825No. of bytes in distributed program, including test data, etc.:16 344Distribution format:tar.gzNature of problem:The programs calculate the Franck-Condon factors and matrix elements over displaced harmonic oscillator wave functions with arbitrary quantum numbers (n,n₁), frequencies (a,a₁) and displacement (d) for the various functions of power (xl), exponential (exp(−2cx)) and Gaussian (exp(−cx²)).Solution method:The Franck-Condon factors and matrix elements are evaluated using binomial coefficients and basic integrals.Restrictions:The results obtained by the present programs show great numerical stability for arbitrary quantum numbers (n,n₁), frequencies (a,a₁) and displacement (d).Unusual features:NoneRunning time:As an example, for the value of Franck-Condon Overlap Integral Inn^′(d;α,α^′)=0.004405001887372332 with n=3, n₁=2, a=4, a₁=3, d=2, the compilation time in a Pentium M 1.4 GHz computer is 0.18 s. Execution time depends on the values of integral parameters n, n^′, d, α, α^′.     

Calculation of atomic hydrogen and its photoelectron spectra in momentum space

An essential modification to the kernel in the numerical calculation of hydrogenic momentum wave functions, is presented in this paper. Using only 256 grid points, the calculated eigenvalues, eigenfunctions and the oscillator strengths are shown to be in excellent agreement with the exact analytic results. The reliable pseudocomplete set of momentum space eigenfunctions is then applied to the time-dependent calculation of intense laser pulse on the hydrogen atom. With the advantage of having no boundary reflection during the time evolution, like that inherent in the coordinate space method, the photoelectron spectra of above-threshold-ionization (ATI) are elucidated for four cases. Some of which are not feasible or very difficult to solve with the coordinate space method. Generalization of the method to single-active electron systems is straightforward. Due to the good accuracy with a reasonably small-sized basis set, applications to the currently interested intense case of laser pulse on atom or molecule are expected.     

氧化钙固硫性能的研究

研究了氧化钙（CaO）在煤燃烧过程中的固硫性能，讨论了燃煤的硫含量，温度、钙硫比以及添加二氧化铈(CeO2）对CaO固硫性能的影响，实验结果表明，随着煤中硫含量的增加，CaO的固硫率增大；CaO的固硫率在最佳固硫温度以下随温度升高而增大，超过最佳固硫温度则随温度升高而下降；同时还发现钙硫比在1：1以上时，CaO的固硫效果比较好，最佳固硫温度约为900℃；当温度为900℃且钙硫比为1：1时，CaO的最大固硫率可达到68％；CeO2的添加，可使最大固硫率提高约10％。     

含硫废镍渣生产硫酸镍过程中钙镁的脱除

研究了用含硫废镍渣生产硫酸镍过程中钙镁杂质的脱除方法 ,结果表明 :当温度为 80℃ ,pH值为 5 .0～6 .0 ,沉淀剂的用量超过理论值 5 0 % ,反应时间 1h以上 ,静置 3h ,钙镁杂质脱除效果良好 ,生产出的硫酸镍产品达到GB6 392 - 86 ,适用于电池、电镀、蓄电池等工业。     

HYDROTHERMAL REACTION OF FLY ASH/HYDRATED LIME: CHARACTERIZATION OF THE REACTION PRODUCTS

Class F coal fly ash was slurried with hydrated lime at 90°C in 1/3, 5/3, 9/3, and 15/3 weight ratios and for 3, 5, 7, and 9 hours of hydration, in a process to prepare sorbents for SO₂ removal. The amounts of aluminum, silicon, and calcium in the product of the pozzolanic reaction were determined in order to study the evolution of product composition with the initial raw materials ratio and hydration time and to relate this composition to the desulfurization capability of the material. Al, Si, and Ca were present in the solid product for any raw materials ratio and hydration time, showing that calcium silicates, calcium aluminates, and/or calcium aluminum silicates were obtained simultaneously. The products formed show a nearly constant molar ratio of Al₂O₃/SiO₂ independent of the experimental conditions tested and similar to the Al₂O₃/SiO₂ ratio in the fly ash. The SiO₂/CaO molar ratio in the products decreased as the initial fly ash/Ca(OH)₂ ratio decreased, being approximately constant for each ratio with respect to hydration time after 5 hours of hydration. The maximum moles of CaO, SiO₂, and Al₂O₃ per gram of sorbent in the reaction product were found for any hydration time for the 5/3 sorbents, meaning that at this initial ratio the pozzolanic reaction takes place at the highest rate. The capacity of the sorbent for SO₂ removal depends not only on the amount of products produced by the pozzolanic reaction but also on the specific surface area of the sorbent.     

生物质型煤固硫性能研究及经济性分析

对生物质型煤固硫机理进行了理论分析 ,通过实验研究了 Ca/S,固硫剂种类及型煤含硫量对固硫率的影响 .结果表明 ,固硫率随 Ca/S比增大而提高 ,Ca/S=1 .5～ 2范围内 ,固硫率趋于最大值 ,当 Ca/S比大于 2后 ,固硫率随 Ca/S增加的趋势显著变缓 ;在同一 Ca/S比下 ,Ca( OH) 2 的固硫效果最好 ,Ca O次之 ,Ca CO3 的固硫效果最差 ;型煤含硫 3%以下 ,固硫率与含硫量成正比 ,含硫量继续增加 ,固硫趋势不断减缓 .通过对生物质型煤固硫费用的分析 ,得出生物质型煤固硫技术是可行的 .     

SiC窑具材料浸渍Ca3(PO4)2与AlPO4混合溶液对材料抗氧化性的影响

SiC窑具材料浸渍Ca3(PO4)2与AlPO4混合饱和溶液,能填充气孔,降低气孔率,阻碍O2的扩散,能增加SiC窑具抗氧化性,延长其使用寿命。浸渍次数越多,氧化速度越小。浸渍1~4次的氧化速度常数比值为: K1混:K2混:K3混:K4混=1.44×10-7:1.16×10-7:1.02×10-7:0.87×10-7=1.66:1.33:1.17:1,浸渍混合饱和溶液的抗氧化能力比浸渍Ca3(PO4)2饱和溶液强。