溶液中小分子空间结构的NMR测定——TRANILAST在丙酮溶液中的三维结构

本文应用矩阵分析的方法对相敏NOESY二维谱的峰强度进行处理,从使用较长混合期的实验中获得了较为精确的交叉驰豫速率率,进而得到有相关峰的各对核之间的距离,此方法适用于研究处于极端窄化运动条件下的小分子的三维空间结构。本文运用此方法研究了药物TRANILAST在丙酮溶液中的三维空间结构,并用分子力学计算方法对实验结果进行了验证。     

尿多胺含量与血液系统恶性肿瘤关系研究 Ⅱ、CGC-FID测定尿中多胺及临床中应用

本文报道采用硅胶预柱快速分离干扰杂质后用CGC-FID法测定尿中多胺。最低极限可测到1nmol。该法快速、灵敏、重现性好、所得回收率高、可用于临床诊断。     

实际Paul阱的电参量计算

用边界元方法，计算了实际Ｐａｕｌ阱，当存在开孔和轴向装配误差时环帽极的面电荷密度及阱的电容值，给出了它们随孔径大小变化的规律，从而为实验中选择孔径的大小提供了理论依据，同时也有助于囚禁离子动力学参数的计算     

Basic properties of wavelets

A wavelet multiplier is a function whose product with the Fourier transform of a wavelet is the Fourier transform of a wavelet. We characterize the wavelet multipliers, as well as the scaling function multipliers and low pass filter multipliers. We then prove that if the set of all wavelet multipliers acts on the set of all MRA wavelets, the orbits are the sets of all MRA wavelets whose Fourier transforms have equal absolute values, and these are also equal to the sets, of all MRA wavelets with the corresponding scaling functions having the same absolute values of their Fourier transforms. As an application of these techniques, we prove that the set of MRA wavelets is arcwise connected in L²(R). Dedicated to Eugene Fabes The Wutam Consortium     

Intense mass-separated beams of halogens and beta-delayed neutron emission from heavy bromine isotopes

Improved production yields of short-lived halogens were obtained from a ThO₂ target, irradiated with 600 MeV protons, in combination with a negative surface ionization source. Mass-separated samples were studied by decay spectroscopy. Production yields of radioactive isotopes of chlorine, bromine, iodine and astatine are presented. Half-lives and relative neutron emission probabilities were measured for the heavy bromine isotopes^89?92Br. Normalizing to earlier publishedP _n values for⁸⁹Br, the results are:⁸⁹Br (4.30±0.14s,P _n =13.6±0.8%),⁹⁰Br (1.92±0.06s,P _n =24.8±1.5%),⁹¹Br (0.53 ±0.03 s,P _n =30.1 ±2.1%), and⁹²Br (0.31 ±0.02 s,P _n =34.6±2.5%). Energy spectra ofβ-delayed neutrons were measured.     

A STATISTICAL THEORY FOR THE BIO-PHOTON EMISSION OF THE LIVING SYSTEMS

ＡＳＴＡＴＩＳＴＩＣＡＬＴＨＥＯＲＹＦＯＲＴＨＥＢＩＯ－ＰＨＯＴＯＮＥＭＩＳＳＩＯＮＯＦＴＨＥＬＩＶＩＮＧＳＹＳＴＥＭＳＰａｎｇＸｉａｏｆｅｎｇＩｎｔｅｒｎａｔｉｏｎａｌＣｅｎｔｒｅｆｏｒＭａｔｅｒｉａｌＰｈｙｓｉｃｓ，ＡｃａｄｅｍｉａＳｉｎｉｃａＤ...     

火焰原子吸收法测定不锈钢中铜

本文介绍了火焰原子吸收法测定不锈钢中的铜,利用加入一定量的乙醇及采用低流量火焰,可以消除大含量基体元素(如铁等)的干扰。铜在0～5μg/ml范围内得到良好的线性关系,相对标准偏差为2.3%(n=9)。     

碲基掺铒光纤放大器增益饱和特性的数值模拟

依据均匀加宽四能级结构速率方程组和光功率传输方程组,数值模拟了1520～1620nm波段范围内碲基掺铒光纤放大器(EDTFA)增益谱特性,以及EDTFA增益谱特性与输入信号光功率的关系.模拟结果显示:随着输入信号光功率的增大,EDTFA增益谱由于饱和效应而呈现平坦化特征.模拟结果与报道的实验测量结果达到了很好的一致.     

原子吸收法间接测定痕量氯

浊度法和离子选择电极电位法是测定氯离子的简便和常用的方法。对于低于10~(-5)mol/L氯离子的测定,这些方法遇到不少困难。本法利用氯离子对银的原子化程度的影响,用AAS法来间接测定低于10~(-5)mol/L浓度氯离子,无需分离,方法快速。这种分析方法具有实际应用价值。