不同极性固定相上醇色谱保留指数的预测

采用拓扑指数(mQ)、定位基参数(SOX)及固定液极性值(CP)与脂肪醇在6种固定相上的气相色谱保留指数值(RI)进行了相关分析,发现RI与上述参数间存在良好的相关性,其关系可表示为:RI=158·384 57·7220Q-12·0491Q 5·720SOX 5·756CP R=0·9913继以留一法(Leave-one-out,LOO)进行交互检验,相关系数RCV=0·9909。说明所建定量结构-保留关系(QSRR)模型具有良好的稳定性和预测能力,较好地揭示了脂肪醇类物质在不同固定相上气相色谱保留指数的变化规律。     

铑(Ⅲ)-偶氮氯膦pA-溴酸钾褪色反应催化光度法测定痕量铑

报道了以铑（Ⅲ）催化溴酸钾氧化偶氮氯膦pA为基础测定痕量铑的催化光度分析法,建立了一种在水相中直接测定痕量铑（Ⅲ）的新方法。铑（Ⅲ）含量在5~30μg/L范围内符合比耳定律,检出限为5μg/L,本法用于铂-铑催化剂中铑的测定,结果满意。     

顶色辅助的多标度人工色理论对稀有过程e~ e~-→s的单圈效应

讨论了顶色辅助的多标度人工色理论预言的赝标哥尔斯通玻色子（ｔｅｃｈ－ ｎｉｐｉｏｎｓ,ｔｏｐ－ｐｉｏｕｓ）对稀有过程ｅ＋ｅ－→ｂｓ的单圈效应,计算了该过程在ＬＥＰⅡ上 的产生截面,得到较标准模型预言值要大一个数量级的数值结果．并进一步讨 论了在Ｂ介子工厂上探测此稀有过程的可能性．     

ETC相互作用对NLC实验中顶夸克对产生过程CP破坏的贡献

在Topcolor辅助的多标度人工色(TOPMTC)模型框架下计算了扩充人工色(ETC)相互作用对顶夸克对产生过程中CP破坏参数δ的贡献(δ=σ[e–e→t(–)–t(–)]–σ[e–e→t(+)–t(+)]/σ(e–e→t–t)).计算结果表明,对于合理的参数取值,ETC相互作用可对参数δ产生较大的修正(8.65×10^－3≤δ≤1.09×10^－2).期望在将来的NLC实验中能观测到此修正效应.     

THE SINE TRANSFORM OPERATOR IN THE BANACH SPACE OF SYMMETRIC MATRICES AND ITS APPLICATION IN IMAGE RESTORATION

In this paper, we study an operator s which maps every n-by-n symmetric matrix A, to a matrix s(A_n) that minimizes || B_n-A_n || F over the set of all matrices B_n, that can be diagonalized by the sine transform. The matrix s(A_n), called the optimal sine transform preconditioner, is defined for any n-by-n symmetric matrices A_n. The cost of constructing s(A_n) is the same as that of optimal circulant preconditioner c(A_n) which is defined in [8], The s(A_n) has been proved in [6] to be a good preconditioner in solving symmetric Toeplitz systems with the preconditioned conjugate gradient (PCG) method. In this paper, we discuss the algebraic and geometric properties of the operator s, and compute its operator norms in Banach spaces of symmetric matrices. Some numerical tests and an application in image restoration are also given.     

超微粒分子筛多孔层毛细管气相色谱柱的初步研制

探讨了以超微粒分子筛成功地沉积于玻璃毛细管内壁制备出新型ＰＬＯＴ柱的方法。实验证明,这种ＰＬＯＴ柱具有快速、高效、稳定和选择分离等独到特性。     

PC/PET/EPDM共混体系的结晶与熔融行为

本文用解偏振光法与DSC法分别测定并研究了PC/PET/EPDM共混体系的结晶速度、结晶度、Avrami指数(n)和熔融温度及其影响因素,共混物中PET的结晶速度、结晶度均随PC含量增加而下降;EPDM用量不超过10%时,可提高PET的结晶速度,但不影响结晶度和成核与增长方式,n值不变。当EPDM为5%时,结晶速度呈现极大值。经退火处理的共混物呈现熔融双峰,PC量增加,高温熔融峰略移向高温方向;热处理温度升高或时间延长,则低温熔融峰移向高温方向。     

Effect of carbon doping on corrosion resistance and conductivity of CrMoN-coated 316L stainless steel bipolar plates

Journal of Solid State Electrochemistry - CrMoCN coatings with different carbon contents are prepared on 316L stainless steel substrates by closed-field unbalanced magnetron sputtering. The...