软骨细胞黏弹性及恢复变形与年龄相关性研究

本文旨在表征年龄对软骨细胞在自然生长过程中的黏弹性和恢复变形能力的影响.结果表明:年龄对软骨细胞黏弹性及其恢复变形能力产生显著影响,老年组软骨细胞各项黏弹性参数值均明显高于幼年和中年组软骨细胞(p<0.000 1),而后两组无显著差异(p>0.05);老年组软骨细胞蠕变达到平衡态所需时间t_E显著小于幼年和中年组(p<0.05),而幼年和中年组无显著差异(p>0.05).老年组软骨细胞最大蠕变位移L_M显著大于幼年和中年组(p<0.005),而幼年和中年组无显著差异(p>0.05).老年组软骨细胞恢复变形时间t_R显著大于幼年和中年组(p<0.005),而幼年和中年组无显著差异(p>0.05).恢复变形前8s的分析发现,幼年组软骨细胞恢复变形率K_y显著高于中年和老年组(P<0.005),而中年组(K_α)和老年组(K_o)软骨细胞的恢复变形率无显著差异(p>0.05);此外,实验发现老年组软骨细胞的残余变形L_R比幼年和中年组显著增大(p<0.005),而后两组无显著差异(p>0.05).研究工作对于软骨组织工程、软骨细胞与支架材料相互作用以及探讨OA发生过程中的力学生物学机制具有理论意义.     

四川某水库右坝肩滑坡成因机制及稳定性分析

拟建水库右坝肩处于由砖红色砂岩夹薄层或透镜状泥岩、粉砂质泥岩构成的斜向V形河谷中,无明显断层构造,雨水充沛且存在一古滑坡,经过调查,滑坡主要由滑坡堆积体和滑动面以及其下方的扰动带组成,滑坡区发育的纵向和横向结构面以及岩层面构成一楔形槽。认为滑坡的成因是暴雨下楔形槽内控制的滑移-拉裂破坏。经过定性分析,古滑坡天然状态是稳定的。采用极限平衡法计算古滑坡在天然状态、地震作用以及暴雨等工况下的稳定系数分别为1.45、1.39及1.27,由此可知滑坡在天然状态下是稳定的,地震作用对其稳定性影响不大,但暴雨作用下滑坡的稳定性有所降低。最后通过数值模拟再现了现阶段古滑坡的应力应变场和变形破坏特征。     

人为扰动的模型势函数及其动力学特征（英文）

目前,结合高精度从头算方法和全维量子动力学计算,对四原子气相反应,理论计算可以获得与实验结果完全一致的结果.一般情况下,一个精确的量子动力学模拟需要一个精确的势能面,但是在实际的计算当中,势能面的拟合误差是不可避免的.在本文中,我们考察了在模型势能面外加各种扰动时的动力学反应行为,在2维的势能面上进行了量子动力学计算.反应速率常数对近反应能垒区域或最小能量反应路径上的干预是较为敏感的,但是在势能面上的其它地方加入的外加干扰对反应速率影响不大.本文给出一个比较重要的和比较简单的结论,在量子动力学模拟中,在精确的势能面上增加相关的扰动,会帮助我们更深入地理解给定类型的反应,对于一个特定体系,其精确势能面上可以作为一个模型体系研究.     

Localization and recurrence of a quantum walk in a periodic potential on a line

We present a numerical study of a model of quantum walk in a periodic potential on a line. We take the simple view that different potentials have different affects on the way in which the coin state of the walker is changed. For simplicity and definiteness, we assume that the walker＇s coin state is unaffected at sites without the potential, and rotated in an unbiased way according to the Hadamard matrix at sites with the potential. This is the simplest and most natural model of a quantum walk in a periodic potential with two coins. Six generic cases of such quantum walks are studied numerically. It is found that, of the six cases, four cases display significant localization effect where the walker is confined in the neighborhood of the origin for a sufficiently long time. Associated with such a localization effect is the recurrence of the probability of the walker returning to the neighborhood of the origin.     

Modelling self-sensing of a magnetostrictive actuator based on a terfenol-D rod

A simplified quasi-static computational model for self-sensing applications of magnetostrictive actuators based on terfenol-D rods is presented. Paths and angle changes in the magnetic moments rotation of Tb0.3Dy0.7Fe2 alloy are studied as functions of compressive stress and magnetic field, and then used to determine the magnetization in its actuation. Then sensing of magnetic induction picked from a driving coil in an actuator is derived. The model is quick and efficient to solve moments rotation and its magnetization. Sensing results of compressive stress and magnetostriction calculated by the model are in good agreement with experiments and will be helpful in the design and control of self-sensing applications in actuators.     

图像盲恢复算法的研究

在点扩展函数未知的情况下,仅通过退化图像来估计原始图像的过程称为图像盲恢复.目前,图像盲恢复已成为数字图像处理领域一个前沿热点课题,有着广泛的应用.国内外诸多学者对图像盲恢复算法已经做了深入广泛的研究.对已提出的图像盲恢复算法进行了分类比较研究,并提出了进一步研究的发展方向.     

917～945nm水汽吸收线线强度和空气加宽系数测量

利用连续波窄带可调谐钛宝石激光器和长光程吸收池测量了９１７～９４５ｎｍ６０余条水汽吸收线的强度和空气加宽系数。线强度测量精度优于４％，加宽系数测量精度优于６％。线强度结果和Ｃｈｅｖｉｌａｒｄ等的测量结果比较，比值为０．９８６±０．０６８５，符合得较好。空气加宽系数和Ｈｉｔｒａｎ－９２数据库比较，比值为０．９０６±０．１６４，存在较大的偏差     

An Improved 3D SPIHT Coding for Hyperspectral Imagery Data Compression

In this paper, an improved 3D SPIHT compression coding method, naming 3D BCSPIHT, based on wavelet zero tree compression coding (EZW), is used to exploit redundancy in 3D hyperspectral imagery data. The experimental results show that this method can obtain the compression ratio 200 for 224 spectral band data without any K-L transformation (KLT) to remove the spectral correlation, and the total compression performance of this method is better than the method of KLT and other two dimensional transformation (such as 2D DCT and 2DWT) to remove the spectral correlation and spatial redundancy. To compare with the total compression ratio of KLT+JPEG method and KLT+BBZTC method, this method reaches 200 folds at the average PSNR of 32.531 dB. This method enhances 2～5 dB in PSNR at same compression ratio to KLT+BBZTC method, and the average compression rate improves above 15 fold.     

改进的对块零树编码压缩方法对超光谱数据压缩

提出了对块零树的预测二值标量量化压缩编码方法，给出了压缩比公式，并应用此压缩编码实现了对超细光谱数据的压缩，该压缩编码方法既具有小波零树压缩编码高压缩比和宜于实时实现的特点，同时具有编码，解码速度快和易于实时传输等优点，实验结果表明，改进的对块零树编码压缩（IBBZTC）方法在不传输剩余误差的情况下，达到190倍的压缩比时，峰值信噪比仍然在30dB以上，压缩性能优于KL变换－静止图像压缩（KLT－JPEG），小波变换－矢量量化（WT－VQ），小波变换一零树矢量量化（WT－ZTVQ）和对块零树编码压缩方法。