Optical rotation and electron spin resonance of an electro-optically active polythiophene

A chiroptical polythiophene, is synthesized by electrolytic polymerization in a cholesteric liquid crystal electrolyte solution. The polymer displays a fingerprint texture similar to that of the cholesteric electrolyte solution. Upon electrochemical doping, the polymer displays optical rotation at wavelengths corresponding to the doping band observable in the absorption spectra. The formation of polarons on the main-chain is confirmed by electron spin resonance measurements. The results demonstrate the intermolecular chirality of polarons in this π-conjugated polymer, indicating continuum delocalized polarons are in a three-dimensional helical environment.     

ESR技术在生物医学领域内的应用概况

自由基理论在生物医学领域中的应用越来越多。而ESR技术是目前研究自由基信息的最好手段。ESR技术在生物医学中的应用主要有：是辐射消毒的定量和定性的临控手段;用于电离辐射剂量估算和重建;用于检测组织氧化能力,在临床上协助肿瘤治疗方案的选择;用于骨移植研究中,可定量检测被照射的移植骨的吸收程度;用于发病机理方面的研究;用于筛选辐射防护剂方面的研究等。     

新型铜配合物的谱学研究

利用变温顺磁共振和变温磁化率方法对所合成的新配合物进行研究,结果表明,３００Ｋ时,ｇ∥＝２．０６,ｇ⊥＝２．１２,ｇ∥〈ｇ⊥,Ｃｕ（Ⅱ）离子处于Ｄ３ｈ对称性的三角双锥结构中,５￣３００Ｋ范围内,磁性参数２Ｊ＝０．５ｃｍ＾－１,Ｃｕ（Ⅱ）离了之间可能存在弱的铁磁性相互作用。     

Constituents of Amomum tsao-ko and their radical scavenging and antioxidant activities

Constituents of the fruit of Amomum tsao-ko were investigated following a preliminary screening of the antioxidant activity of several extracts of the fruit of this plant that showed that the dichloromethane extract and the ethyl acetatesoluble and water-soluble fractions of the 70% aqueous acetone extract had higher activity than α-tocopherol and butylated hydroxytoluene (BHT). Eleven compounds were isolated from the ethyl acetate-soluble fraction, and their structures were elucidated as (+)-hannokinol (1), meso-hannokinol (2), (+)-epicatechin (3), (−)-catechin (4), β-sitosterol (5), β-sitosterol 3-O-glucoside (6), 2,6-dimethoxyphenol (7), protocatechualdehyde (8), protocatechuic acid (9), vanillic acid (10), and p-hydroxybenzoic acid (11) based on mass and various nuclear magnetic resonance (NMR) spectroscopic techniques. This is the first isolation of epicatechin and catechin from the genus Amomum. The radical scavenging activity of the isolated compounds was evaluated using 1,1-diphenyl-2-picrylhydrazyl (DPPH) and colorimetric and electron spin resonance (ESR) analyses. The antioxidant activity of the compounds was also determined based on the oxidative stability index (OSI). The catechins and catechol derivatives showed strong activities in both the DPPH radical scavenging activity and antioxidant activity assays.     

淀粉/丙烯腈接枝共聚反应速率及反应机理

研究了玉米淀粉与丙烯腈在高锰酸钾引发下的接枝共聚反应速率和反应机理,由实验结果得出了引发剂浓度,单体浓度,淀粉浓度对接枝反应速率的影响,并由此关联出接枝反应速率表达式：Ｒｇ＝ｋ「ＫＭｎＯ４」＾１／２「ＡＮ」「ＡＧＵ」＾１／２。由接枝反应速率和反应温度与时间的关系求得接枝反应的表观活化能力为Ｅａｇ＝３０．７４ｋＪ／ｍｏｌ。用顺磁共振原位分析等方法分析了在接枝反应锰离子价态的变化物和淀粉的氧化程度,并     

电渣重熔体系影响渣池运动因素的解析

对影响电渣重熔体系渣池运动的因素进行了分析与计算,同时建立了渣池速度场与温度场耦合的数学模型。计算结果表明：电磁力是渣池运动的主要驱动力;此外,渣池温度分布不均匀产生的浮力对渣池运动的影响也很显著,而电动力及金属熔滴在渣中下落产生的摩擦力对渣池运动的影响相对较小。     

电渣重熔体系电毛细振荡的动态模拟

通过理论分析和交、直流电动态模拟试验证实了交流电渣重熔体系存在电毛细振荡;交流电频率越高,渣－金界面的振荡频率越大,振幅随之减小;在直流电渣重熔过程中,渣－金界面不存在电毛细振荡。     

电渣重熔大型冷轧辊用钢的工艺研究

电渣重熔（ESR）钢所生产的冷轧辊能显著改善冷轧辊质量,提高轧辊使用性能。通过对电渣重熔工艺的系统研究,在国产10 t大型电渣重熔炉上开发了以递减功率模型为核心的钢锭结晶质量控制、渣皮厚度控制和防止增氢等先进工艺技术。采用该技术的重熔电耗为1400 （kW·h）/t,所生产的产品质量稳定,各项性能指标达到比国家标准更为严格的企业内控标准,得到用户好评。     

Quantitative determination of Ni and V in FCC catalysts monitored by ESR spectroscopy

Calibration mixtures containing Ni⁰ and V⁴⁺ in the range from 500 to 4000 ppm have been prepared using various supports (silica, alumina, titania and ultrastable Y zeolite (USY)) with different particle sizes. ESR measurements revealed a linear relation between the impregnated metal amounts and the registered ESR signal integrals and/or intensities, suitable for the determination of the NiO (reduced to Ni⁰) and V⁴⁺ contents in FCC catalysts, respectively. The amount of NiO in a FCC equilibrium catalyst was determined to about 1300 ppm of a total of 2500 ppm Ni compound present in this sample, whereas the amount of V⁴⁺ was estimated to about 1800 ppm of a total of 2800 ppm vanadium species. Hence, this catalyst contains about 1000 ppm V⁵⁺. This revised version was published online in August 2006 with corrections to the Cover Date.     

NO分解催化剂Cu/分子筛的ESR研究 Ⅰ.水合铜分子筛的ESR研究

系统地比较了在各种不同制备条件下制得的Ｃｕ／ＺＳＭ－５、Ｃｕ／丝光沸石、Ｃｕ／镁碱沸石和Ｃｕ／毛沸石的ＥＳＲ谱，至少六种水合Ｃｕ物种被发现，而且发现分子筛的腔结构对Ｃｕ物种的存在状态有很大的影响。