电感耦合等离子体原子发射光谱分析中自适应卡尔曼滤波法研究

将自适应卡尔曼滤波（ＡＫＦ）用于ＩＣＰ－ＡＥＳ信号处理，并对影响滤波的因素进行了探讨，对于一些典型光谱干扰，测定的回收率为８５－１０５％。在选择了合适的初始参数条件下，ＡＫＦ法分析结果优于常规卡尔曼滤波（ＮＫＦ）法。     

ICP－AES中基体元素对硫的光谱干扰（Ⅱ）

ＩＣＰ－ＡＥＳ中基体元素对硫的光谱干扰（Ⅱ）卢汉兵张保军，魏路线（武汉华中师范大学分析测试中心，武汉，４３００７０）（武汉工学院微观分析中心）关键词电感耦合等离子体发射光谱，光谱干扰，硫ＩＣＰ－ＡＥＳ中，由于对２００ｎｍ以下的光谱干扰研究工作报道极少...     

用自适应滤波校正电感耦合等离子体原子发射光谱分析中的光谱干扰

本文从分析谱线与干扰的统计特性出发，将信号处理技术的自适应嗓声抵消模型用于校正ＩＣＰ－ＡＥＳ中的光谱干扰。模拟与实测光谱校正结果表明，光谱干扰自适应滤波方法是可行的、有效的。     

PDA－ICP－AES中光谱干扰校正的卡尔曼滤波法研究

本实验采用光电二极管阵列（ＰＤＡ）检测器消除波长定位误差、并藉平滑处理原始光谱图以减轻随机噪声影响，研究了卡尔曼滤波法在ＰＤＡ－ＩＣＰ－ＡＥＳ中光谱干扰校正方面的应用，探讨了影响滤波结果准确性的若干因素。藉此法分析了一些合成试样，回收率一般为９０％～１１０％。     

7，2＇－DIDESACETOXY AUSTROSPICATINE， A NEW TAXANOID FROM THE BARKS OF TAXUS WALLICHIANA ZUCC

７，２＇－ＤＩＤＥＳＡＣＥＴＯＸＹ　ＡＵＳＴＲＯＳＰＩＣＡＴＩＮＥ，　Ａ　ＮＥＷ　ＴＡＸＡＮＯＩＤ　ＦＲＯＭ　ＴＨＥ　ＢＡＲＫＳ　ＯＦ　ＴＡＸＵＳ　ＷＡＬＬＩＣＨＩＡＮＡ　ＺＵＣＣ７，２＇－ＤＩＤＥＳＡＣＥＴＯＸＹＡＵＳＴＲＯＳＰＩＣＡＴＩＮＥ，ＡＮ...     

PARAMAGNETIC AND DIAMAGNETIC DICOPPER（Ⅱ） COMPLEXES WITH DI－SCHIFF BASE DERIVED FROM 2－HYDROXY－1－NAPHTHALDEHYDE AND1，3－DIANINO－2－PROPANOL

ＰＡＲＡＭＡＧＮＥＴＩＣＡＮＤＤＩＡＭＡＧＮＥＴＩＣＤＩＣＯＰＰＥＲ（Ⅱ）ＣＯＭＰＬＥＸＥＳＷＩＴＨＤＩ－ＳＣＨＩＦＦＢＡＳＥＤＥＲＩＶＥＤＦＲＯＭ２－ＨＹＤＲＯＸＹ－１－ＮＡＰＨＴＨＡＬＤＥＨＹＤＥＡＮＤ１，３－ＤＩＡＮＩＮＯ－２－ＰＲＯＰＡＮＯＬ...     

AN EFFICIENT AND STEREOSPECIFIC SYNTHESIS OF 1－PALMITOYL－2－［（z，z，z）－9，12，15－LINOLENOYL］－SN 2－GLYCEROPHOSPHOCHOLINE

ＡＮＥＦＦＩＣＩＥＮＴＡＮＤＳＴＥＲＥＯＳＰＥＣＩＦＩＣＳＹＮＴＨＥＳＩＳＯＦ１－ＰＡＬＭＩＴＯＹＬ－２－［（ｚ，ｚ，ｚ）－９，１２，１５－ＬＩＮＯＬＥＮＯＹＬ］－ＳＮＧＬＹＣＥＲＯＰＨＯＳＰＨＯＣＨＯＬＩＮＥ￥ＪｉｅＸＩＡａｎｄＹｏｎｇＺｈｅｎｇＨ...     

电热蒸发进样电感耦合等离子体原子发射光谱（ETV－ICP－AES）联用技术研究

本文采用国产部件组装了一套ＥＴＶ－ＩＣＰ－ＡＥＳ仪器体系，对装置的连接及操作参数进行优化。深入系统地考察了分析物的蒸发过程和传输过程，提出了难熔元素的蒸发和传输机理。研究了ＥＴＶ－ＩＣＰ－ＡＥＳ中基体效应，提出了以聚四氟乙烯为氟化剂，氟化辅助ＥＴＶ－ＩＣＰ－ＡＥＳ测定难熔元素的新方法，应用于环境和生物标样中痕量元素分析，获得满意结果。     

SYNTHESIS OF PEG-DENDRIMERIC PEPTIDE

ＳＹＮＴＨＥＳＩＳ　ＯＦ　ＰＥＧ－ＤＥＮＤＲＩＭＥＲＩＣ　ＰＥＰＴＩＤＥＳＹＮＴＨＥＳＩＳＯＦＰＥＧ－ＤＥＮＤＲＩＭＥＲＩＣＰＥＰＴＩＤＥ￥ＤｅＸｉｎＷＡＮＧ；ａｎｄＬｅｉＨＵＡＮＧ（ＩｎｓｔｉｔｕｔｅｏｆＭａｔｅｒｉａＭｅｄｉｃａ，ＣｈｉｎｅｓｅＡ...     

数字化谱的智能化处理

与传统的单变量分析方法不同，本文引入数字化谱的概念，采用多变量分析技术，充分利用学谱数据中所包含的信息，探索一条新的解决ＩＣＰ－ＡＥＳ中光谱干扰的途径。文中给出了有关的实验数据。     

The photodegradation of poly(vinyl chloride) films—IV

The concentration of residual tetrahydrofuran in cast poly(vinyl chloride) films has been varied. It is shown that the amount of tetrahydrofuran present does not affect the extent of degradation but that it does affect the relative concentration of the conjugated polyenes produced. A shift towards shorter polyenes is observed with increasing concentration of residual solvent; this effect is attributed to its ability to act as a plasticizer.     

从核磁共振的化学位移探讨取代苯亲电取代反应的活性和区域选择性

亲电取代反应是一类基本的有机反应,其中以苯环上的亲电取代反应最常见。该反应的反应活性及反应的位点与苯环上已有的取代基有很大的关系。本文从波谱学的角度,利用核磁数据,阐述了已有的取代基如何影响苯环的电子云密度,进而影响苯环亲电取代反应的活性和取代的位置。本文视角新颖,将对学生的学习及科研产生启发。     

去除粗盐可溶性杂质必须第一步去除硫酸根离子——从盐效应角度分析实验步骤

去除粗盐中可溶性杂质的原理是教学中的一个重点,而实验步骤则是教学中的重中之重。中学教学中通常认为氢氧化钠溶液与氯化钡溶液的添加顺序对实验没有影响,但是由于盐效应,经计算可知添加顺序直接影响硫酸根离子是否能够除净,因此该实验的操作步骤必须第一步去除硫酸根离子,否则硫酸根离子将无法除净。     

Uses and analyses of curtin-hammett/winstein-holness systems involving second order reactions

The Curtin-Hammett (C-H) principle and the Winstein-Holness (W-H) equation approximate the product ratio and overall rate constant of reaction for systems involving a starting material which exists in two forms, each of which reacts via first-order kinetics to give a different product. The C-H/W-H approximations are valid when the rates of isomer interconversion are significantly faster than the rates of product formation. The present treatment encompasses non-first-order reactions to product. A numerical predictor-corrector technique is used to show (1) that relative reagent concentration can affect both the product ratio and the observed rates of product formation; (2) that the absolute concentration of reagent and substrate can affect the kinetics; and (3) that factors (1) and (2) above can affect the validity of the C-H/W-H approximations for non-first-order C-H/W-H schemes.     

Micelles for signal enhancement and novel selectivity of dansyl amino acids

Fluorescence intensity of various chemical species is enhanced in the microenvironment provided by micelles. Parameters which affect fluorescence intensities are examined by using dansyl (Dns) amino acids as the probe. The retention behavior of Dns-amino acids in micellar LC is examined by using ion-exchange-induced stationary phases. The type and concentration of micellar agent and modifier ion as well as concentration of acetonitrile in the mobile phase affect the retention and signal intensity of Dns-amino acids. The order of elution of Dns-amino acids obtained with the micellar mobile phase is very different from that observed in conventional reversed-phase LC. Fluorescence intensities of Dns-amino acids are enhanced by the micellar mobile phase.     

Interactions between light and circadian rhythms in plant photoperiodism

Abstract— The timing mechanism in plant photoperiodism seems to involve two endogenous circadian rhythms: a light-on (dawn) rhythm and a light-off (dusk) rhythm. Following a period of darkness light may affect flowering without affecting the rhythms, or it may affect flowering by rephasing the rhythms. A hypothesis is presented concerning the mechanism of the interaction between illumination and endogenous rhythms based upon correlations between leaf movements and flowering responses in various photoperiodic treatments. The possible role played by phytochrome in the response is considered in relation to the effects of light quality on the responses.     

Operando HERFD-XANES and surface sensitive Δμ analyses identify the structural evolution of copper(Ⅱ) phthalocyanine for electroreduction of CO2

The quantitative understanding of how atomic-level catalyst structural changes affect the reactivity of the electrochemical CO₂reduction reaction is challenging.Due to the complexity of catalytic systems,conventional in situ X-ray spectroscopy plays a limited role in tracing the underlying dynamic structural changes in catalysts active sites.Herein,operando high-energy resolution fluorescence-detected X-ray absorption spectroscopy was used to precisely identify the dynamic structural transformation of well-defined active sites of a representative model copper(Ⅱ)phthalocyanine catalyst which is of guiding significance in studying single-atom catalysis system.Comprehensive X-ray spectroscopy analyses,including surface sensitive△μspectra which isolates the surface changes by subtracting the disturb of bulk base and X-ray absorption near-edge structure spectroscopy simulation,were used to discover that Cu species aggregated with increasing applied potential,which is responsible for the observed evolution of C₂H₄.The approach developed in this work,characterizing the active-site geometry and dynamic structural change,is a novel and powerful technique to elucidate complex catalytic mechanisms and is expected to con tribute to the rational design of highly effective catalysts.     

互贯型螯合树脂的研究．Ⅱ．IPN型含偕胺肟基螯合树脂的合成与性能研究

以交联聚苯乙烯－聚丙烯腈树脂为骨架，经功能基化反应制备出含偕胺肟基团的互贯型螯合树脂。对功能基化反应条件和螯合树脂对金的吸着性能，吸着选择性和吸着机理进行了研究。互贯型螯合树脂的吸着性能与互贯树脂的结构有关，而螯合树脂的选择吸着性则与互贯网络无关．     

Radiation induced degradation of EPR by IR oxidation profiling

Infrared absorption spectroscopy has been used to investigate the effect of γ-radiation on ethylene-propylene copolymer loaded with different amount of antioxidant. The oxidation profiles were obtained analyzing slices of the samples by an IR microscope. The IR spectra have shown that the antioxidant content does not affect the shape of the oxidation profiles; their dependence on thickness and dose rate is in good agreement with the Clough and Gillen model. Our results indicate that the antioxidant does not affect the reactions involved in the oxidation process and the oxygen distribution on the sample.     

灭多威的光催化降解动力学研究

研究了农药灭多威在ＴｉＯ２光催化下的降解产物，反应动力学及影响降解速度的因素，灭多威在ＴｉＯ２催化下１０ｍｉｎ内可被完全转换为无机物而失去毒害作用，ＩＲ研究表明，灭多威的分解产物ＮＨ＾＋４，ＳＯ＾２－４和ＣＯ２，其分争过程中准一级反应，除铜和氯离子体低浓度时有促进作用，而高浓度为阻碍作用外，大部分阴，阳离子对降解均有不利影响。