Flexible pneumatic twisting actuators

Compliant pneumatic actuators have attracted the interests of the robotics community especially for applications where large strokes are needed in delicate environments. This paper introduces a new type of compliant actuator that generates a large twisting deformation upon pressurization. This deformation is similar to torsion in solid mechanics, and can be characterized by a twisting angle along the longitudinal axis of the actuator. To produce prototype actuators, a new fabrication process is developed that uses soft lithography. With this process, prototype actuators with a width of 7mm and a thickness of 0.65mm have been produced that exhibit a twisting rotation of 6.5 degrees per millimeter length at a pressure of 178kPa. Besides design, fabrication and characterization, this paper will go into detail on stroke optimization. © 2013 IEEE.

Manopt, a matlab toolbox for optimization on manifolds

Optimization on manifolds is a rapidly developing branch of nonlinear optimization. Its focus is on problems where the smooth geometry of the search space can be leveraged to design effcient numerical algorithms. In particular, optimization on manifolds is well-suited to deal with rank and orthogonality constraints. Such structured constraints appear pervasively in machine learning applications, including low-rank matrix completion, sensor network localization, camera network registration, independent component analysis, metric learning, dimensionality reduction and so on. The Manopt toolbox, available at www.manopt.org, is a user-friendly, documented piece of software dedicated to simplify experimenting with state of the art Riemannian optimization algorithms. By dealing internally with most of the differential geometry, the package aims particularly at lowering the entrance barrier. © 2014 Nicolas Boumal.

Diode-pumped passively Q-switched Yb : YAG microchip laser with a GaAs as saturable absorber

A passively Q-switched Yb: YAG microchip laser has been constructed by using a doped GaAs as the saturable absorber as well as the output coupler. At 13.5 W of pump power the device produces high-quality 3.4 muJ 52 ns pulses at 1030nm with a pulse repetition rate of 7.8kHz in a TEM00-mode.

可证明安全性理论与方法研究

论述了可证明安全性理论在安全方案与安全协议的设计与分析中的应用，内容主要包括：什么是可证明安全性，可证明安全性理论涉及到的一些基本概念，RO（randomoracle）模型方法论的基本思想及其在公钥加密和数字签名等方案中的应用研究进展，标准模型下可证明安全性理论在公钥加密和数字签名等方案中的应用研究进展，以及可证明安全性理论在会话密钥分配协议的设计与分析中的应用研究进展．

应变异质结构中超薄中间层的应变协调作用

用一个简单模型讨论了应变异质结构中嵌人中间层对界面失配位错产生和应变释放的影响．根据能量最小原理得到了弹性能最小状态下界面失配位错密度，发现当中间层材料的晶格常数比衬底和外延层的都大或者都小并且厚度足够薄时，超薄中间层可以完全吸收支撑衬底和外延层之间的应变而不产生任何界面失配位错，具有所谓无支撑衬底的应变协调作用．

超临界压力下航空煤油水平管内对流换热特性数值研究

采用RNG(renormalization group)k-ε湍流模型和近壁区的Wolfstein一方程模型对超临界压力下大庆RP-3航空煤油在水平圆管内的流动和换热特性进行了数值研究.超临界压力下,由于航空煤油在拟临界点附近热物性的剧烈变化,浮升力将引起显著的二次流动.二次流动使得水平圆管的下表面湍流强度和对流换热增强,而上表面的湍流强度和对流换热减弱.最后分析了两种水平管内对流换热受浮升力影响判别标准在超临界流体中的适用性

不同丛枝菌根真菌对万寿菊生长及柴油降解率的影响

在盆栽条件下,用沈抚污灌区非灭菌水稻土,研究了柴油浓度为5 000 mg·kg-1时接种3种AM真菌(Glomus mosseae,G.geospora,G.constrictum)和细菌对万寿菊(Tagetes erecta)耐油性的影响.结果表明,在此浓度下,AM菌仍能和万寿菊形成共生体,白色万寿菊比黄色万寿菊耐油能力强,总生物量增加63.1％;接种AM真菌的处理,其侵染率比对照高3.5％～29.9％.G.mosseae和G.geospora是较好的菌种,总生物量分别比对照增加9.0％和42.7％;混接AM真菌效果一般.施入细菌菌剂虽然抑制了AM菌对万寿菊的侵染,但促进了菌根化植物的营养生长和生殖生长.5种接菌处理中,以接种G.geospora和混接AM菌和细菌的处理最好,对柴油的降解率分别比对照增加16.51％和14.05％.

基于ETM~+影像的森林资源信息提取——以黄土高原丘陵沟壑区水土保持林为例

以森林资源遥感分类为切入点,以黄土高原丘陵沟壑区陕西黄龙县境内的水土保持林作为对象,针对ETM+遥感影像在森林信息提取中存在的大量混合像元的问题,引入一种基于针叶林-阔叶林-灌草(C-B-G)模型的混合像元分解方法,通过这种方法,分别得到研究区针叶林、阔叶林、灌草的覆盖图像,并提取出了针阔混交林的分布情况。采用ER-DAS 9.1对分类结果进行精度评价,结果表明针阔混交林的分类精度相对于通用分类方法——监督分类的精度提高了20%,说明该方法可以改善植被信息提取的效果。

基于遥感影像的矿区土地利用变化研究

掌握矿区土地利用变化规律,有效制定矿区土地利用政策是矿山可持续发展的重要基础。利用RS和GIS技术对土地利用变化进行检测、变化信息提取与发现以及对其进行分析,得出了土地利用变化的基本规律,为矿区土地资源的合理利用提供决策依据。结果表明:该方法效率高,成本低,技术性强,是目前一种较先进的土地利用变化监测方法。