Improvement of the Mirror Extending in Empirical Mode Decomposition Method and the Technology for Eliminating Frequency Mixing

The mirror extending approach proposed by Zhao and Huang ^[9] in EMD method is improved in this paper.Mirror extending manner of data is kept unchanged,but the apprioach for determining envelopes is changed.When the end of data is obviously not extremum,the envelope is determined by the first inner extremum and the image value in the mirror,ignoring the value on the end.This improvement eliminates the frequency compression near the end and decreas the error.Meanwhile,tridiagonal equations are used and the calculation speed is much increased.The temporal process curve is more important in reflecting the real physical process and comparable with other phenomena,Frequency mixing in IMFs makes it impossible,A high frequency reconstruction (HFR) approach is proposed to eliminate common frequency mixing and reconstruct an IMF with all high frequency portions.By this approach,the IMFs without frequency mixing are obtained to express significative processes.The high frequency information restored in high frequency IMF can be extracted by general spectrum method,After obtainning IMFs by EMD method,some of the theoretical and technological issues still exist when using the IMFs.The consistency of IMFs with real physical process is discussed in detail.By virtue of the approach proposed in this paper,the EMD method can be widely used in various fields.     

关于聚丙烯酰胺溶液粘度性质的探讨

测定并比较了聚丙烯酰胺溶液的特性粘数及其旋转粘度 ,表明二者之间在质量浓度为(0 0 0 0 6～ 0 0 0 1 0g mL)范围内具有良好的线性关系 .此规律可用于将实测聚丙烯酰胺溶液的旋转粘度转化为其分子量予以表征 ,从而为快速检测聚丙烯酰胺的分子量提供了方法 ,同时本实验还考察了聚合物浓度和剪切速率对旋转粘度的影响     

一种确定岩石抗压强度的新技术：刻划测试

岩石抗压强度是重要的岩石力学特性参数,常采用在压力机上直接压坏标准试样的方式测得.虽然该测量方法得到了广泛的应用,但是这些方法具有显而易见的缺点:耗费时间长、所需岩样多、试样加工困难、岩石非均质性对实验结果影响严重等.介绍了利用刻划测试岩石抗压强度的原理、方法以及测试技术,对均质砂岩和非均质泥页岩开展了刻划测试实验,可靠性分析研究表明,刻划测试技术准确、可靠,具有很大的推广价值.     

基于修正窗口内在变差的结构保持滤波算法

针对现有结构保持滤波算法中结构与纹理的分离能力的不足,提出了一种结构似然性度量算子——修正窗口内在变差。该方法构造局部加权内在变差,并结合变差修正算子来衡量每个像素点属于边缘结构的似然度。然后将之与双尺度高斯滤波结合,构建高质量引导图,并作为联合双边滤波的初始值,通过双边滤波多次迭代获得最终的输出结果。实验结果证实,相较于几种经典算法,本文方法能够在平滑纹理的同时,更好的保护图像的精细结构,对边缘结构的处理也更加干净、清晰。     

KD306型耐硫甲烷化催化剂本征动力学

采用等温积分反应器,测试了ＫＤ３０６型耐硫甲烷化催化剂的本征动力学,建立了幂函数动力学模型。检验表明：模型拟合良好,残差分布合理,参数回归显著,模型能真实反映ＫＤ３０６型耐硫甲烷化催化剂的反应特性。     

氢过氧自由基双分子自反应机理的理论研究

用从头计算法在ＵＨＦ／６ － ３１Ｇ＊ ＊ 水平上研究了氢过氧自由基双分子自反应的历程。优化了反应物、中间体、过渡态和产物的几何构型,通过振动分析确认了过渡态,利用ＧＡＭＥＳＳ程序得到内禀反应坐标（ＩＲＣ） 。研究表明,该反应是自发趋势较大的夺氢放热过程,活化势垒为１１２ ．５１ｋＪ．ｍｏｌ－１ 。     

Study on the Characteristics of Macromolecular Chains of Cellulose in Dilute Solutions

The characteristics of macromolecular chains of cellulose in dilute solutions are discussed. Viscometry was used for the measurement of the intrinsic viscosity [η] of four cellulose samples, which were respectively dissolved in the solvent Tri-ethylenediamine cadmium hydroxide Cadoxen (Cadoxen), Cupriethylenediamine hydroxide(Cuen), iron sodium tartrate complex(EWNN) and N,N-dimethylacetamide(DMAc)with lithium chloride(LiCI, 9% w/w). The intrinsic viscosity of the four solutions decreased in the following manner:[η]DMAc/LiCl>[η]EWNN>[η]Cuen>[η]Cadoxen. The stability of cellulose (Sample α-cellulose) dissolved in solvents Cuen and EWNN was tested by plotting the intrinsic viscosity vs. time. The values of Huggins constant K_H for the cellulose samples dissolved in solvents Cadoxen,Cuen,EWNN and DMAc/LiCl (9% w/w ) were calculated.     

聚间苯二甲酰对氨基苯砜的合成与表征

以4,4′-二氨基二苯基砜（4,4′-DDS）和间苯二甲酰氯（IPC）为单体,通过低温缩聚反应合成出了一系列含砜基的高分子量聚砜酰胺,并用IR和1HNMR光谱对这些聚合物进行了结构表征,用乌氏粘度计和CMT-8500电子万能试验机等对聚合物的分子量和力学性能等进行了表征.实验结果表明：随着分子量的增大,聚芳砜酰胺的弹性模量、拉伸强度等力学性能也随之增大;分子高度取向的聚芳砜酰胺纤维比分子非取向的聚芳砜酰胺膜有更好的机械性能.分子量大小对聚芳砜酰胺纤维的力学性能有更大的影响.     

H2O＋H→OH＋H2反应的理论研究

对Ｈ２Ｏ＋Ｈ→ＯＨ＋Ｈ２反应，用从头算方法（ＵＭＰ４／６－３１Ｇ）作了ＩＲＣ解析，计算活化能与实验值相符，在沿ＩＲＣ动态学分析的基础上，用传统过渡态理论，变分过渡态理论及相应隧值效应校正计算反应速率常数，获得了与实验值一致的结果。     

基于卡尔曼滤波的股市泡沫度量

提出了一种新的基于卡尔曼滤波的股市泡沫度量模型.该模型将股市泡沫和内在价值均视为不可观测变量,利用市盈率中含有的股票内在价值的信息和信贷量中所含有的股市泡沫信息,同时对股票市场的理性泡沫和内生泡沫进行估计.实证结果表明,我国股市泡沫在2001-06达到最大,随后开始减小;我国股市只存在理性泡沫,而不存在内生泡沫,这反映了我国股市的投机性较大;通过对股市泡沫破裂前后的对比分析表明,我国股市的实际投资价值正越来越明显.