P507负载泡塑吸附分离-中子活化法测定地质样品中的稀土元素

研究了P507负载泡塑萃取柱吸附、分离和富集稀土元素的条件,确定了地学样品中微量稀土元素的化学前处理方法和中子活化测量条件。方法的RSD在3.4%~10%之间,回收率大于92%。用国家标准物质进行分析验证,测定结果与推荐值相符。     

负离子远红外纳米银、锌、硒元素中药外治烧烫伤药剂的应用研究进展

烧烫伤为热源造成体表组织的损伤,大面积的深度烧烫伤可并发休克、败毒症等。介绍了用纳米粉碎技术,将中药超微粒化,添加纳米锌、硒等微量元素,加广谱强效纳米银系(AT)抗菌剂、麦饭石纳米粉、远红外二氧化钛、电气石在传统中药配方基础上制成的纳米中药,用于烧烫伤的治疗,提高了药物疗效。     

非线性再生散度模型的几何结构及其渐近推断

本文基于唐年胜等(1999)对非线性再生散度模型在欧氏空间建立的微分几何结构导出了与估计有关的随机展开以及与统计曲率有关的若干渐近推断,推广了韦博成等人关于非线性回归模型和指数族非线性模型的相应结果.     

Fano-Like Resonance in Cylinders Including Nonlocal Effects

We investigate the optical response of a metallic wire calculated from the classical electromagnetic theory. The Drude （local） approach is compared with the semi-classical hydrodynamical theory calculations that reveal the Fano-like resonances of subsidiary peaks originated from the nonlocality. The bulk plasma resonances containing the nonlocal effects could be depressed by increasing the dissipation, while the blue shift of the surface localized plasma resonances could be enhanced by increasing the Fermi velocity.     

Stability of elliptic vortex solitons in anisotropic nonlocal media

Elliptic vortex solitons are investigated in anisotropic nonlocal media with more general formulations. We address the existence and dynamics of such solitons analytically and numerically. The solution of elliptic vortex solitons depends on the eccentricity of both the input beam and nonlocal response function. With different degrees of nonlocality, we numerically investigate the evolution of the elliptic vortex solitons, and find that, typically, the elliptic vortex solitons with single and double charges collapse into spiraling dipole- and tripolelike soliton clusters, respectively.     

Observation of tropospheric NO_2 by airborne multi-axis differential optical absorption spectroscopy in the Pearl River Delta region,south China

An airborne multi-axis differential optical absorption spectroscopic （AMAX-DOAS） instrument was developed and applied to measure tropospheric NO2 in the Pearl River Delta region in the south of China. By combining the measurements in nadir and zenith directions and analyzing the UV and visible spectral region using the DOAS method, information about tropospheric NO2 vertical columns was obtained. Strong tropospheric NO2 signals were detected when flying over heavilly polluted regions and point sources like plants. The AMAX-DOAS results were compared with ground-based MAX-DOAS observations in the southwest of Zhuhai city using the same parameters for radiative transport calculations. The difference in vertical column data between the two instruments is about 8%. Our data were also compared with those from OMI and fair agreement was obtained with a correlation coefficient R of 0.61. The difference between the two instruments can be attributed to the different spatial resolution and the temporal mismatch during the measurements.     

GM3018脱硫剂在LPG深度脱硫中的开发和应用

M30 1 8脱硫剂是将原料气中的无机硫催化转化为单质硫 ,生成单质硫后沉积在脱硫剂中 ,而有机硫则被催化转化为硫和硫酸根 ,沉积在脱硫剂中。脱硫效果的好坏实际上取决于硫的转化。脱硫剂需定期更换 ,回收处理     

一个新的方阱流体状态方程

将方阱势能函数视为硬球势和一个短程均匀负势的叠加,并由统计力学方法导出了相应的状态方程,这个方程包含两个定标的径向分布函数.利用已知的压缩因子分子动力学模拟数据,回归得到了这两个径向分布函数,从而建立了一个新的方阱流体状态方程.它的吸引项要比Alder等人回归得到的简单得多,与方阱流体压缩因子的MD数据一致性也更好,特别是在高密度区域.     

基于激光靶耦合问题的二阶精度重映算法

在现有二维激光靶耦合程序LARED-H中，用流体力学方程组描述等离子体的运动，流体计算以拉氏计算为主，经常由于网格的大变形导致数值计算提前终止。ALE方法是目前解决大变形问题中比较流行的方法，在二维空腔计算中，希望能在变形较大的地方采用欧拉区来解决大变形问题。高精度的重映算法是ALE算法中最重要的部分之一，本工作的目的就是研究适用于激光靶耦合问题的高精度重映算法。     

试论选择题的评分标准

自从一九七八年以来,高考数学试题出现单重选择题(所给的几个答案中只有一个是正确的)。一九八三年以来,高考数学试题又出现多重选择题(所给的几个答案中,至少有一个