一种多光谱高温计无源温区的标定方法研究

目前,高温测量中,多光谱高温计具有高分辨率与高信噪比的优点,但无源温区(大于3 000℃)标定方法的发展却远滞后于多光谱高温计制造水平,并已严重影响高温计的测量精度和应用范围。为突破高温测量领域中无源温区标定方法的瓶颈,文章提出了一种多光谱高温计无源温区的标定方法。此方法利用已知温度点的多光谱高温计的输出电压U建立了一种基于幂函数的温度-电压(T-U)模型。在此基础上应用导数最小二乘法对模型参数求解,实现对无源温区的标定。理论和实测数据都验证了此方法的有效性与精度。在多光谱高温测量应用的光谱范围(0.4～1.1μm)内,对精度优于3‰,1%和3%的无源温区标定范围做出理论上的划分。     

Derivative free two-point methods with and without memory for solving nonlinear equations

Two families of derivative free two-point iterative methods for solving nonlinear equations are constructed. These methods use a suitable parametric function and an arbitrary real parameter. It is proved that the first family has the convergence order four requiring only three function evaluations per iteration. In this way it is demonstrated that the proposed family without memory supports the Kung-Traub hypothesis (1974) on the upper bound 2ⁿ of the order of multipoint methods based on n + 1 function evaluations. Further acceleration of the convergence rate is attained by varying a free parameter from step to step using information available from the previous step. This approach leads to a family of two-step self-accelerating methods with memory whose order of convergence is at least and even in special cases. The increase of convergence order is attained without any additional calculations so that the family of methods with memory possesses a very high computational efficiency. Numerical examples are included to demonstrate exceptional convergence speed of the proposed methods using only few function evaluations.     

透光率导数光谱与吸光度导数光谱的比较

研究了糖精钠在220－260nm的1－6阶透光率导数光谱和吸光度导数光谱，透光率导数光谱的灵敏度大大高于吸光度导数光谱，但其抗干扰能力比吸光度导数光谱差，两者特征峰强度与浓度的线性关系接近。     

用2-(4,5-二甲基-2-噻唑偶氮)-5-二甲氨基苯甲酸作显色剂导数光度法同时测定钴和镍

本文研究了用2-(4,5-二甲基-2-噻唑偶氮)-5-二甲氨基苯甲酸(简称DMTAMB)作显色剂,在乙醇介质中,利用一阶导数消除钴(Ⅲ)和镍(Ⅱ)彼此间的干扰,对镍矿石中微量钴和镍进行同时测定,结果满意。     

用四(4-三甲铵苯基)卟啉作显色剂导数分光光度法同时测定钴镉铅的研究

本文以四(4-三甲铵苯基)卟啉作显色剂,在阳离子表面活性剂CPB存在下的pH9.8缓冲溶液中,利用三阶导数分光光度法,对钴、镉、铅的同时测定进行了详细研究。本方法测定灵敏度较高,对合成样品进行测定,结果令人满意。     

Crystal and Molecular Structure of 4-Phenyl-cyclohexanone Semicarbazone

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Die Zahl der Substitutions‐ und Leerstellenvarianten des NaCl‐Typs bei verdoppelter Elementarzelle (a,b, 2c)

The Number of Substitution and Vacancy Derivatives of the NaCl Type with Doubled Unit Cell (a, b, 2c) All space groups have been deduced that can occur when a fraction of the atoms of the NaCl type is substituted or removed and the unit cell is doubled to a , b , 2 c . This was done with the aid of a Bärnighausen family tree of crystallographic group‐subgroup relations. The number of different possible structure types has been calculated for each space group. The number of possibilities increases considerably with decreasing space group symmetry and with increasing number of symmetry‐independet cation and anion positions. Comparison with known structures reveals the predominant importance of the symmetry principle in crystal chemistry. Especially those structures are favored which have the fewest numbers of inequivalent positions for atoms of one kind. These include anatase, α‐LiFeO₂, SnF₄, SrSnP, BaNiSn₃, BaCl(OH)(OH₂), GdCoC, KNb₄O₆, and La_xNb₂O₆; if some distortion is tolerated, ThCr₂Si₂, LaNiB₂C and LiNCN may also be included. There still exist structural possibilities with high symmetry, albeit no known representative. For compounds like PdAg₂O₂ or PdHgO₂ likely structures are predicted.     

导数吸光光度法快速测定药物的体外经皮渗透量

用改进了的Franz扩散室（L.G.Y扩散室）处理给药贴片和鼠皮，设定取样时段，吸取接受室中溶液，用导数吸光光度法测定给药经皮渗透量。所得结果与高效液相色谱法（HPLC）一致，而效率约为原法（使用未改进的Fuanz扩散室，用HPLC测定）的10倍。     

紫外一阶导数光度法测定壳聚糖的脱乙酰度

以盐酸为溶剂 ,N 乙酰基 D 葡萄糖胺为标准品 ,用紫外一阶导数光度法直接测定壳聚糖的脱乙酰度。标准曲线在 0 .0 0 2 5 0 .0 4 0 0mg·ml- 1范围内线性关系良好 ,回归方程dA/dλ =2 .349C + 0 .0 0 0 8(r =0 .9996 )。相对标准偏差为 0 .2 0 %～ 0 .76 % ,回收率为 99.8%～ 10 1.4 %。该法消除了共存物、浊度、色度的干扰 ,准确度高 ,重现性好 ,样品不需特殊处理简单易行