Permutation Analysis of Track and Column Braiding

Introduction Trackandcolumnbraidingisanavailable3D braidingmethod[1～3],whichperformsbraidingprocessbymovingbraidingcarriersalongroworcolumndirection alternatively.LiandDing[4]examinethebraidingmethod andconcentratetheirstudyonthemovementofbraiding carriersonthebraidingplatform,onwhichthebraiding tracksarelocated.Accordingtothebraidingprinciple,a studyofbraidingprocessisactuallyastudyofthemovingpatternofyarnendsonthebraidingplatform.Intheiranotherpaper[6],thepositionsofbraidingcarriersare r…     

大孔径毛细管气相色谱法快速测定食品中毒鼠强

以邻苯二甲酸二丁酯为内标，采用FID检测器，建立了一种测定食品中的毒鼠强的大孔径毛细管气相色谱新方法。测定结果表明毒鼠强的线性范围为0.02g/L-0.12g/L，其最低检测浓度为0.02g/L，相对标准偏差为2.6%，平均回收率为84.6%，该法简便、准确、重现性好。     

大孔径毛细管气相色谱法测定野生果汁中的氨基酸

建立了一种以正丁醇和七氟丁酸酐为衍生化试剂的氨基酸气相色谱分析法。优选了衍生化条件，对野生果汁中的氨基酸进行了分离及定量分析，经多种样品测定，均获得满意的分析结果。     

理想非线性单组分色谱模型理论解与实验的比较

用气相色谱的分析方法研究了理想非线性单组分不同温度下的流出曲线，用＂特征点＂法回归出了各组分的物理常数Ｇ和ｂ，代入理论模型公式，并与实验结果进行子比较。     

The crystal-like anatomical uniformity of the striate cortex

The visual field is topographically mapped onto the primary visual cortex (V1), forming a retinotopic map which is far more detailed for the foveal regions than for the periphery. We found that receptive field (RF) size in monkey V1 increases with eccentricity, and that a 1—2 m² V1 region contains roughly a complete set of machinery necessary to analyze a visual-field area whose size is about that of the RFs of the cells. This allows V1 to be anatomically uniform, and is in sharp contrast with the retina.     

矩阵的弱相似性及其应用

推广了矩阵环Mn(F)中相似性概念，提出了矩阵的弱相似概念，研究了它的基本性质，获得一些有趣结果，此外，指出了文[3]的一个错误，给出了Laffey-Choi一个关键引理的矩阵式的证明。     

杨辉三角与行列式

本文用杨辉三角构造了两种类型的行列式，然后逐一讨论了这两类行列式的值，并由此得到了它们一些特例的简洁结果。     

粘结开裂破坏框架柱性能的研究

本文以试验结果为基础,通过轴压力、配筋、配箍、加载方向的变化,分析了这些因素对产生粘结开裂破坏框架柱性能的影响,并给出了产生粘结开裂破坏的m值下限。     

Analysis of Pyrolysates for Phenol Formaldehyde Resin by Py-GC/MS

Pyrolysis of phenol formaldehyde resin has been investigated by Pyrolysis Gas Chromatography-Mass Spectroscopy at the different temperatures from 500℃ to 750℃. Its composition of pyrclysates has been analyzed. Several compounds, especially benzene, toluene, p-xylene could only be formed above 500-550℃. Howerver, peak intensities for some pbend derivatives were decreased at the higher temperature. During pyrolysis, for thermo-setting phenol formaldehyde resins, polymeric chain scissions take place as a successive removal of the monomer units from the polymeric chain. The chain scissions are followed by secondary reactions, which leads to a variety of compounds. Addition reactions can also take place among the double-bond compounds during pyrolysis.