剪切速率对各向异性不排水剪强度影响分析

在各向异性弹粘性本构关系基础上，推导考虑粘性各向异性不排水剪强度表达式，探讨剪切速率与不排水剪强度之间的关系，并从理论上解释各向异性不排水剪强度的速率相关性，最后将理论计算值与试验结果进行比较，验证理论的合理性。     

济阳坳陷上第三系馆陶组河流相沉积的粒度特征

讨论了济阳坳陷上第三系馆陶组河流沉积的粒度特征，在对１４口岩心井３００块样品粒度分析的基础上，研究了粒度参数与水动力条件之间的关系，总结归纳出不同微相的概率曲线特征，并利用Ｃ－Ｍ图、萨胡判别式和粒度离散图研究了河流类型．研究结果表明，不同性质的河流，其粒度在垂向上的变化速率不同，直接影响到砂体的非均质性．     

物理量分布的各向异性的几何分析方法:椭球法

研究了物体质量、介质光学折射率等物理量的各向异性分布的相应几何表示－－椭球方法；并将此法推广到电导率、电量分布等情况。可以看出：椭球法能够直观方便地描述物理量的各向异性。     

各向异性条件下深基坑抗隆起稳定性分析

考虑初始不等压固结状态引起的不排水剪强度的各向异性，反在本构方程基础上得到的正常固结和超固结粘土的不排水剪强度应用到深基开挖抗隆起稳定的分析中，得到稳定安全系数公式，针对典型上海软土进行分析，并以工程实例加以验证。     

基于力学性能和各向异性的排水性沥青磨耗层优化

为了研究排水性沥青混合料的各向异性和力学性能,对排水性沥青磨耗层进行优化,自行改装设计了车辙板渗水系数测试仪.该装置能够模拟实际雨水在路面中渗流的过程.研究对10种级配的沥青混合料进行了力学性能试验以及利用自行制作的渗水试验仪进行了渗水特性试验研究.研究结果表明,排水性沥青磨耗层的力学性能与排水性能呈负相关关系;对于同一最大公称粒径的不同级配沥青混合料,随着空隙率的增大,力学性能逐渐减小而排水性能增强;增大集料公称最大粒径,其力学性能和排水性能均有所增强.各向渗水差异性主要发生在横向渗水过程中,竖向渗水差异不大;增大排水性沥青混合料的空隙率和公称最大粒径可减小其各向异性.研究得出的最佳空隙率为18％～21％,坡度设置为1.2％～1.5％,可增强其排水性能.研究成果对排水功能性沥青路面的应用具有一定的理论与实用价值.     

三维应力状态下岩石各向异性结构面自由剪胀的力学特性

考虑结构面的空间形态及其与三维应力场的关系，分析了在侧向恒应力及约束位移两类边界条件下界面剪切的滑移方向、各向异性剪胀及弧度等力学特性，研究了约束位移时应力的增量规律，并由实验结果得到验证，这些结论对正确描述与评阶界面的力学特性，分析地下工程的稳定性（如井眼稳定、套管损坏等）具有一定的参考价值。     

各向异性天然裂缝油藏裂缝方位的确定

在天然裂缝油藏中，裂缝的主方向决定了主渗透率的方向，确定裂缝方位对于天然裂缝油藏开发和注水方案的设计具有重要的意义。基于Ｗａｒｅｎ和Ｒｏｏｔ提出的双孔隙度模型建立了各向异性天然裂缝油藏的数学模型，通过坐标变换和Ｌａｐｌａｃｅ变换，求出了该模型在Ｌａｐｌａｃｅ空间的分析解，用Ｓｔｅｆｅｓｔ数值反演方法求出该模型在实空间的解。同时给出了用最小二乘法对多井干扰试井的压力数据拟合确定裂缝方位的方法。     

Application of NIR spectroscopy for firmness evaluation of peaches

The use of near infrared （NIR） spectroscopy was proved to be a useful tool for quality analysis of fruits. A bifurcated fiber type NIR spectrometer, with a detection range of 800-2500 nm by InGaAs detector, was used to evaluate the firmness of peaches. Anisotropy of NIR spectra and firmness of peaches in relation to detecting positions of different parts （including three latitudes and three longitudes） were investigated. Both spectra absorbency and firmness of peach were influenced by longitudes （i, ii, iii） and latitudes （A, B, C）. For modeling, two thirds of the samples were used as the calibration set and the remaining one third were used as the validation or prediction set. Partial least square regression （PLSR） models for different longitude and latitude spectra and for the whole fruit show that collecting several NIR spectra from different longitudes and latitudes of a fruit for NIR calibration modeling can improve the modeling performance. In addition, proper spectra pretreatments like scattering correction or derivative also can enhance the modeling performance. The best results obtained in this study were from the holistic model with multiplicative scattering correction （MSC） pretreatment, with correlation coefficient of cross-validation γcv=0.864, root mean square error of cross-validation RMSECV=6.71 N, correlation coefficient of calibration r=0.948, root mean square error of calibration RMSEC=4.21 N and root mean square error of prediction RMSEP=5.42 N. The results of this study are useful for further research and application that when applying NIR spectroscopy for objectives with anisotropic differences, spectra and quality indices are necessarily measured from several parts of each object to improve the modeling performance.     

A new quantitative relation between deformation texturesand corresponding mechanical properties of FCC metals

Quantitative analysis of deformation-induced textures and texture-induced mechanical properties is an important issue for optimal design and control of plastic forming of metals.Deformation-induced textures were predicted through the crystal plasticity finite-element method(CPFEM)in this study,and varying deformation modes,including uniaxial compression,uniaxial tension,simple shear,and plane-strain compression,were considered.The predicted textures were proven by experiments.Then,a theoretical model was proposed to build the quantitative relation between textures and the corresponding mechanical properties.This model takes into account the effects of grain’s orientation,grain’s interaction,and the property in the level of single grain.It captures the macroscopic anisotropy owing to textures and microscopic anisotropy owing to crystallographic structures.By applying this model,the macroscopic stress responses of grains’aggregate with varying textures were calculated according to grain’s orientations and the intrinsic properties of the single crystal along[100]and[111]crystallographic directions.The theoretical model is proven to have high efficiency and acceptable accuracy in the prediction of texture-induced mechanical properties comparing with CPFEM model.     

Modelling of strain induced magnetic anisotropy in Au additive FePt thin films

L1_0 ordering at low temperature and controlled grain size are prerequisites for the fabrication of magnetic recording media. This can be achieved by several methods such as addition, under layer or over layer of third element in FePt. In the present work, the kinetics of L10 ordering in the presence of immiscible element Au is investigated by varying the Au concentration at different annealing temperatures. The structural analysis shows that the Au additive not only promotes the ordering at low temperature but also supports the textured growth along(001) plane. The magnetic measurements supported by theoretical simulations using Monte Carlo predicts that the enhancement in coercivity attributed to induced strain anisotropy and weakening of inter-granular exchange coupling may be due to presence of Au at grain boundaries.