导数光谱－Kalman滤波法校正ICP－AES光谱干扰的研究

本文以导数光－Ｋａｌｍａｎ滤波法研究了ＩＣＰ－ＡＥＳ中典型的光谱干扰，考察了该法的检出限和准确度，探讨了该法的影响因素。结果表明，该法能有效地消除和校正光谱干扰，降低分析检出限，结果准确可靠。     

Synthesis and evaluation of 5-aminimidazole-4-carboxamide riboside derivatives as anti-fatigue agents

Fatigue has a negative influence on daily life and work, and serious or chronic fatigue can even cause health problems. Studies have shown that 5-aminoimidazole-4-carboxamide-1-β-D-ribofuranoside (AICAR) can exert anti-fatigue effects by activating AMP-activated protein kinase (AMPK). In this study, six AICAR derivatives with substitution at the hydroxyl sites of the ribose moiety were synthesized and evaluated as anti-fatigue agents. All of the derivatives were demonstrated to effectively resist fatigue in animal models. The mice treated with the optimal compound ZHM-01 showed an 8.6-fold greater exhaustion distance in the running wheel test and a 5.1-fold greater exhaustion time in the weight-loaded swimming test than those of the blank control group. ZHM-01 treatment also reduced lactic acid (LA) and blood urea nitrogen (BUN) accumulation during exercise. In addition, ZHM-01 administration enhanced the phosphorylation of AMPK but did not excite the central nervous system. Moreover, ZHM-01 showed good biological safety in a 21-day toxicity evaluation. This study provides a new reference for the development of treatments for fatigue-related health problems.     

Steffensen type methods for solving nonlinear equations

In the present paper, by approximating the derivatives in the well known fourth-order Ostrowski’s method and in a sixth-order improved Ostrowski’s method by central-difference quotients, we obtain new modifications of these methods free from derivatives. We prove the important fact that the methods obtained preserve their convergence orders 4 and 6, respectively, without calculating any derivatives. Finally, numerical tests confirm the theoretical results and allow us to compare these variants with the corresponding methods that make use of derivatives and with the classical Newton’s method.     

The Range Set of Meromorphic Derivatives

ＴｈｅＲａｎｇｅＳｅｔｏｆＭｅｒｏｍｏｒｐｈｉｃＤｅｒｉｖａｔｉｖｅｓＩｎｄｒａｊｉｔＬａｈｉｒｉ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，ＪａｄａｖｐｕｒＵｎｉｖｅｒｓｉｔｙ，Ｃａｌｃｕｔａ－７０００３２，Ｉｎｄｉａ）ＡｂｓｔｒａｃｔＩｎｔ...     

meso-四(对甲氧苯基)卟啉与锌(Ⅱ)、铜(Ⅱ)的显色反应及其导数行为研究

本文用自己合成的meso-四(对甲氧苯基)卟啉显色剂研究了Zn和Cu的高灵敏测试方法。在吐温-80存在下,PH7.05时,T(4-MOP)P(上述试剂)与Zn和Cu的显色反应于沸水浴中加热15和7min能定量进行,其摩尔吸光系数分别为4.95×10~5和3.39×10~5。用于纯铅样品中锌和铜的测定,结果与原子吸收法相吻合。本文还对Zn、Cu显色体系的导数光谱行为进行了探讨。其结果,它们的四阶导数摩尔系数响应值为8.85×10~6和5.50×10~6,不酸化时,Zn体系竟达1.12×10~7,灵敏度提高17～30倍。     

同步-导数荧光分析法多组份同时测定的可行性判断

本文对同步荧光光谱及其导数光谱进行计算机模拟,并由微机处理结果来判断多组份体系同步-导数荧光分析法同时测定的可行性。     

C60衍生物修饰的固体支撑双分子层磷脂膜(s-BLM)分子器件的电化学和拉曼光谱研究

本文配合拉曼光谱技术比较了以不同的C60衍生物修饰的固体支撑双分子层磷脂膜（s-BLM)分子器件体系对I^-的检测灵敏度，结果表明，一些衍生物可使s-BLM体系对I^-的检测灵敏度进一步提高，显示了C60衍生物在BLM分子器件中良好的应用前景。     

时间分辨技术、窗口技术及导数技术在稀土荧光分析中的应用

本文探讨了时间分辨技术、窗口技术及导数技术在稀土荧光光谱分析中的应用。实现了铕、钐、铽和镝等四个稀土元素的同时测定,获得了满意的结果。     

Simultaneous First-Derivative Spectrophotometric Determination of Nickel and Manganese Complexes with 2-(2-Pyridylmethyleneamino)phenol

Abstract

A method is proposed for the simultaneous determination of nickel and manganese by first-derivative spectrophotometry based on their reactions with 2-(2-pyridylmethyleneamino)phenol (PMAP) Schiff base. The method allows the determination of Ni and Mn in the concentration range 0.3–3.0 μg ml^?1 in mixtures with their ten-fold concentration ratio. The method has been applied for Ni and Mn determination in bronzes. To optimize the experimental conditions for spectrophotometric determination of Mn with PMAP stability constants at different pH values have been determined. A critical evaluation of the proposed method was performed by statistical analysis of the experimental data.