激光雷达信号随机误差的估算

在分析随机误差来源和激光雷达数据特点的基础上,介绍一种新的随机误差计算方法——噪音比例因子方法.该方法用一次测量数据列中远处背景信号算出噪音比例因子,再由噪音比例因子求出任一距离上有用信号的随机误差.用实测的激光雷达信号进行检验,结果表明,这种方法是可靠且可行的.     

L625激光雷达探测平流层气溶胶

介绍了一台用于探测以层气溶胶的米氏散射激光雷达及其数据处理方法,其探测结果与美国SAGEⅡ卫星的结果基本一致。初步分析了1991年－1998年期间平流层气溶胶消光系数和积分体后向散射系数的变化特征。     

增塑剂对1,1,1-三[1′-(2′-氧杂-4′-氧代-5′-氮杂-5′-甲基)十二烷基]丙烷PVC膜钠离子电极性能的影响

以1,1,1-三[1′-(2′-氧杂-4′-氧代-5′-氮杂-5′-甲基)十二烷基]丙烷(即ETH 227,Fluka No.71732)为中性载体的钠离子选择电极由于具有较强的抗钾离子干扰的能力,因而颇受注意。Guggi等首先用邻硝基苯辛醚和癸二酸二丁酯增塑,以合成的ETH227制成了K_((Na)~+,K~+)~(pot),<<10~(-2)的PVC膜钠离子电极.Jenny等以癸二酸二异辛酯为增塑剂,     

激光光源粒子计数器响应曲线对粒子折射率敏感度及多值性的分析

采用激光作光源的光学粒子计数器(L_OPC)克服了白炽灯作光源时使用寿命短、发光强度不稳定、需要经常标定的缺点,但激光波长的单一也带来了一些问题,如响应曲线对折射率敏感度的变化和多值性等问题。利用Mie散射理论,通过数值模拟实验,对L_OPC的这些问题进行了分析,提出了L_OPC实验样机的设计参数。     

Generation of UV laser light by stimulated Raman scattering in D2, D2/Ar and D2/He using a pulsed Nd:YAG laser at 355nm

A pulsed Nd:YAG laser at 355nm is used to pump Raman cell filled with D_2, D_2/Ar and D_2/He. With adequately adjusted parameters, the maximum photon conversion efficiency of the first-order Stokes light (S_1, 396.796nm) reaches 33.33% in D_2/Ar and the stability of S_1 in pure D_2 is fairly high, the energy drift being less than 10% when the pump energy drifts in the range of 5%. The conversion efficiency and stability, which are functions of the composition and pressure of the Raman medium and the energy of pump laser, are investigated. The result has been used to optimize the laser transmitter system for a differential absorption lidar system to measure NO_2 concentration profiles.     

线性方程组对于量词的可满足性

本文讨论有关主理想环上线性方程组对于量词组合的可满足性问题,特别是当全称量词和存在量词混合出现的情形.它的背景之一是模上的线性定理的机械化证明.我们对此问题得到了一个算法型的充要条件,该方法对量词未做任何限制.进而讨论了在有限生成Abel群、初等数论、向量空间、多元多项式环等领域中的应用.     

光学粒子计数器测量结果的订正

本文根据球形粒子的米(Mie)散射原理计算了光学粒子计数器的散射相函数和仪器响应曲线。根据被测粒子的折射率对测量结果做出订正。在研究大气气溶胶粒子尺寸谱变化规律时,这种订正是很重要的。文中举例说明了实际订正方法。     

双差分测量对流层臭氧的实验研究

 提出了利用266nm,289nm,308nm三波长进行臭氧测量的数值模拟和实际测量实验研究。三波长双差分和双波长差分的模拟实验结果表明,当对流层气溶胶分布相当不均匀,后向散射比梯度较大时,气溶胶对双波长差分测量臭氧影响很大,而对三波长双差分测量臭氧影响较小。     

农药甲霜灵对映体的高效液相色谱分离及手性拆分热力学研究

以正己烷 异丙醇为流动相 ,在纤维素 三 (3 ,5 二甲基苯基氨基甲酸酯 ) (CDMPC)涂敷型手性固定相上 ,对农药甲霜灵外消旋体进行了拆分 ,考察了流动相组成、柱温等对甲霜灵对映体的保留和分离的影响 ;对甲霜灵R、S对映体与固定相之间的保留和分离的热力学机理进行了讨论     

ALTERATION IN CHROMATIN CONFORMATION OF PROLIFERATING AND DIFFERENTIATING ENZYME GENES IN NORMAL MOUSE LIVER AND ASCITES HEPATOMA CELLS AND ITS RELATION TO THE GENE EXPRESSION OF ENZYMES

Nuclei from the normal mouse liver were partially digested with micrococcal nuclease, followed by DNA extraction, agarose gel clectrophoresis and dot blot hybridization with ~(32)P-labeled cDNA probes of CPS_1 and ACT complex, It was clearly shown that the CPS_1 genes were distributed on the monomer, dimer. and trimer of nucleosomes, while the genes coding for ACT complex were distributed on the condensed oligonucleosomes. An opposite manner of distribution of CPS_1 and ACT complex genes was, however, noted in the case of ascites hepatoma cells, in which the specific activity of ACT was 13 times higher than that in the normal liver, while that of CPS_1 was remarkably reduced. Similar patterns of change in mRNA level of CPS_1 and ACT complex were observed in the normal mouse liver and ascites hepatoma cells, indicating a close relationship between chromatin structure and gene expression of these enzymes.