动态杨氏模量实验有关测量方法的探讨

本文对有关实验现象作了描述和解释，通过理论分析和推导，给出了动态杨氏模量实验共振频率和相位差的测量方法．     

镍配合物催化乙烯低聚/聚合的研究进展

催化乙烯低聚或聚合的镍配合物催化剂研究,不仅帮助提供探索乙烯配位聚合机理的催化剂模型,更为重要的帮助探讨不同催化剂模型下的催化剂活性和选择性,为工业界寻找具有潜在应用价值的高效催化剂奠定基础.同时,利用镍配合物催化剂容易导致所得聚烯烃树脂产生支链的特点,有望制备具有优异性能的支化聚烯烃树脂.本文综述了近年来镍配合物在乙烯低聚或聚合催化剂研究方面的进展,并特别强调了催化剂结构和催化性能之间的内在规律.     

聚酰亚胺类液晶光定向层材料的研究

经含有羟基的二胺单体HAB与二酐单体 4 ,4′ (六氟异丙基 ) 双邻苯二甲酸酐 ( 6FDA)的缩聚反应 ,制备了含有羟基的先驱聚合物PI OH ,通过PI OH上羟基与肉桂酰氯的酯化反应 ,制备了侧链带有肉桂酸酯基团的光敏聚酰亚胺PI CI.用氢核磁共振 ( 1H NMR)分析、傅立叶红外光谱 (FTIR)分析等表征了上述聚合物的结构与感光性能 .用紫外 可见光谱 (UV Vis)等方法研究了PI CI的光交联反应 .聚合物PI CI旋镀膜经线性偏振光聚合技术 (LPP)处理并装配得到的液晶盒可使液晶分子很好地定向沿面排列 .上述实验表明 ,本文所合成的聚酰亚胺定向层材料是一种新的液晶光定向层材料     

一种基于暗脉冲光布里渊时域分析仪的延长传感距离的方法

基于暗脉冲的布里渊时域分析仪系统中泵浦光和探测光的功率较高,相互作用强烈,严重限制了系统的有效传感距离.而现有的系统众多采用利用多段具有不同布里渊散射频率的光纤相互连接延长传感距离的方法,降低每段光纤上的受激布里渊散射效应,延长有效传感距离,但这种方案会增加的系统的复杂度,影响实际应用.本文提出一种简单的暗脉冲光布里渊...     

Time-Domain Techniques for Transient Scattering from Dielectric Bodies and Sea Surface Governed by Jonswap~s Sea Spectra ＊

A time-domain surface integral equation （TDCFIE） approach is utilized to calculate the transient scattering from arbitrarily shaped, three-dimensional dielectric bodies. In conjunction with the marching-on-in-time （MOT） method, the TDCFIE-MOT method is used to derive explicit expressions for the present-time current as a function of the incident field. Sample results showing various geometries are presented and are compared with other numerical techniques. Finally, by an incident Gaussian plane tapered wave, transient scattering from the sea surface governed by Jonswap＇s sea spectra is computed.     

An Efficient Simulated Sea Slope Model for Backscattering from a Non-Gaussian Sea Surface

Based on the double superimposition model, a sea slope model is obtained on the basis of the generated oceanic surface instead of being assumed as a Gaussian distribution model. Then, a summation formula of the backscattering coefficient is derived from the Bass Fuks two-scale model and its application is extended to the non-Gaussian oceanic surface with the help of simulated sea slopes, which can adequately reflect the non-Gaussian configuration of the sea surface. Finally, this scattering model is employed to describe the baekscattering configuration of sea surfaces in different sea states and wind directions, and is confirmed by several numerical examples.     

An angular cutoff composite model for investigation on electromagnetic scattering from two-dimensional rough sea surfaces

Based on the local configuration angle division to select the corresponding method for electromagnetic scattering calculation from rough sea surface,this paper presents an angular cutoff composite model:when the local scattered angle is in the specular region that is given by an approximately 20 degrees cone around the specular direction,the Kirchhoff approximation is applied to evaluate the specular reflection,which dominates the total scattering in this region;the small perturbation method is employed to handle the diffuse reflection which is predominant as the local scattered angle is situated out of the specular region.Numerical results are compared with those of experimental and theoretical models in several configurations as a function of incident angle,wind speed,wind direction.The comparison of numerical results of other experimental and theoretical models in several configurations shows that the new composite model is robust to give accurate numerical evaluations for the sea surface scattering.     

高效液相色谱-荧光检测多类型肥料中宛氏拟青霉SJ1提取物

建立了一种测定多类型肥料中肥料增效型宛氏拟青霉SJ1提取物(ZNC)的高效液相色谱-荧光检测分析方法。以乙酸乙酯作为萃取溶剂，肥料增效型ZNC荧光的最佳激发波长为260 nm,发射波长为330 nm,优化洗脱条件为水、甲醇、乙腈混合梯度洗脱，采用HITACHI LaChrom C18色谱柱进行检测。结果表明，方法的线性关系良好，相关系数(R²)>0.99,在信噪比(S/N)=3的条件下，复合肥料和尿素中肥料增效型ZNC的检测限为0.25 mg/kg,氨基酸水溶肥中肥料增效型ZNC的检测限为5.0 mg/L,回收率为71.6%～93.5%,相对偏差(RSD,n=3)为2.9%～7.3%。本方法利用化合物本身荧光特性，操作简单，准确度和精密度均满足方法学指标，可为肥料监管部门监督和新型肥料质量内部控制提供一种有效的检测手段。