上、下能级都有泵浦的激光场运动方程

本文采用密度矩阵方法,在计及激光系统中上、下能级都有泵浦和场的损耗的情况下,导出了激光场的运动方程和稳态解。讨论了阈值条件及平均光子数。发现在此情况下输出光强与上能级泵浦率为r_a-r_b,下能级泵浦率为零时相同、但光子统计分布与“相干态”情况偏离更大。     

太阳电池材料用金中铁含量测定的研究

文章提出用N2O-C2H2火焰原子吸收光谱法测定太阳电池材料用金中铁含量测定的研究。方法具有良好的灵敏度,干扰少,重现性好。铁量在1.0～10mg/mL范围内与吸收值呈良好的线性关系。其相对标准偏差小于1.0%。标准加入回收率在97.0%～98.0%(n=6)之间,适用于太阳电池材料用金中铁的质量控制分析和样品系统分析。     

火焰原子吸收分光光度法测定矿石中铜的含量的不确定度评定

通过火焰原子吸收分光光度法重复6次测定矿石中铜的含量,计算标准偏差,并用标准添加法,计算回收率,阐明了矿石中铜的含量不确定度的评定步骤和评定方法,归纳出铜的含量测定的不确定度分量及影响的分析结果的不确定度主要来源有:样品的消解产生的不确定度、待测物测量过程中产生的不确定度、样品重复性实验不确定度。     

Solid solution strengthening in multicomponent fcc and bcc alloys:Analytical approach

Based on virtual solvent concept, novel methods are developed to determine interatomic distance, atomic size misfit, and elastic modulus misfit in multicomponent alloys with components having the crystal structure differing from that of the alloy. The combination of the different methods results in a number of models to calculate solid solution strengthening. These models are assessed with view point of the best fit to experimental data. The models giving the most reliable strengthening prediction can be used for an evolutionary design of strong and stable multicomponent alloys.     

确定原子体系精细波函数的群论方法

原子体系的精细波函数是群ＳＵ２在各种首权下的不可约表示基。群ＳＵ２的约化，虽有一套完整的处理方法，但计算十分繁杂，且比较抽象。本文通过分析群ＳＵ２与转换群Ｓｎ间的同态对应关系，由转换群Ｓｎ的不可约基，得到群ＳＵ２的不可约基。本文以四（价）电子原子体系为例进行讨论，分三部：一、实验事实和量子力学一般结论；二、Ｓ４的约化系数矩阵及其不可约表示基；三、ＳＵ２在首权ｓ＝２，１，０下的不可约表示基－－四（价     

石墨炉原子吸收法测定动物组织中痕量铬的研究

本文报导了在酸性介质中，用石墨炉原子吸收法测定动物组织中痕量铬的最佳实验条件。系统的论述了消化剂的选择，消化时间控制，进样酸度以及共存元素对测定结果的影响。实验结果表明，采用ＨＮＯ３－ＨＣｌＯ４进行动物组织样品消化效果优于ＨＮＯ３－ＨＣｌ－Ｈ２Ｏ２。本文给出了动物组织的最佳消化条件及分析方法。     

粉体样品制样方式对AFM图像的影响

研究不同的粉体样品制样方式对AFM图像的影响,实验证明磨具压片使松散的样品紧密而更有利于扫描,使用轻敲模式,设置点小于1V,获得清晰图片。     

Research progress in quantifying the mechanical properties of single living cells using atomic force microscopy

The advent of atomic force microscopy （AFM） provides a powerful tool for investigating the behaviors of single living cells under near physiological conditions. Besides acquiring the images of cellular ultra-microstruc- tures with nanometer resolution, the most remarkable advances are achieved on the use of AFM indenting tech- nique to quantify the mechanical properties of single living ceils. By indenting single living cells with AFM tip, we can obtain the mechanical properties of cells and monitor their dynamic changes during the biological processes （e.g., after the stimulation of drugs）. AFM indentation-based mechan- ical analysis of single cells provides a novel approach to characterize the behaviors of cells from the perspective of biomechanics, considerably complementing the traditional biological experimental methods. Now, AFM indentation technique has been widely used in the life sciences, yielding a large amount of novel information that is meaningful to our understanding of the underlying mechanisms that govern the cellular biological functions. Here, based on the authors＇ own researches on AFM measurement of cellular mechani- cal properties, the principle and method of AFM indentationtechnique was presented, the recent progress of measuring the cellular mechanical properties using AFM was summa- rized, and the challenges of AFM single-cell nanomechani- cal analysis were discussed.     

原子力显微镜相位象的理论和应用

文章讨论了原子力显微镜在轻敲模式下相位象的两类主要理论,简谐近似理论和能量理论;介绍了相位象在软材料如聚合物等表面分析研究上的应用,以及目前相位象研究的新问题。     

原子吸收在缓蚀剂(PD)吸附特性研究中的应用

本文提出-种利用原子吸收分光光度法(AAS)并结合电化学方法来研究孔蚀特征,通过分析腐蚀介质中FeCr、Mn、Ni的含量,研究不锈钢钝化膜破坏机理.方法的特征吸收0.01-1μg/mL/L