嵌段共聚水溶性高分子在空气/水界面吸附态的构象

对于用几种不同疏水／亲水单体比合成的聚(丙烯酸丁酯／丙烯酸)共聚物样品测定了其水溶液的表面张力,运用Gibbs吸附方程求得在样品溶液临界胶束浓度时样品在气／液界面的分子吸附面积,以此推测其吸附态构象。结果表明,亲水单体单元在共聚物中含量多时,样品分子趋于在水中溶解;疏水单体单元多时,样品分子趋于在表面吸附。其吸附态构象为分子链上相邻的数个丁酯侧基吸附于水面,形成“薄煎饼状”疏水微区。     

深度解离高硫煤的表面特性及表征

选择具有代表性的高硫煤(山东兖州煤与重庆南桐煤)为研究对象,通过深度解离(-200目以下),采用红外光谱、X-射线衍射、电子能谱仪、扫描电镜等表征手段对两种煤中煤和黄铁矿硫的物理性质、矿物成分及解离面的表面化学组成、界面物理化学特性差异进行分析。研究揭示高硫煤在高解离度下煤与煤系黄铁矿硫的物理特性、表面特性、煤与煤系黄铁矿硫表面特性的差异.     

Feature combination for classifying single-trial ECoG during motor imagery of different sessions

The input signals of brain-computer interfaces (BCIs) may be either scalp electroencephalogram (EEG) or electrocorticogram (ECoG) recorded from subdural electrodes. To make BCIs practical, the classifiers for discriminating different brain states must have the ability of session-to-session transfer. This paper proposes an algorithm for classifying single-trial ECoG during motor imagery of different sessions. Three features, derived from two physiological phenomena, movement-related potentials (MRP) and event-related desynchronization (ERD), and extracted by common spatial subspace decomposition (CSSD) and waveform mean, are combined to perform classification tasks. The specific signal processing methods utilized are described in detail. The algorithm was successfully applied to Data Set I of BCI Competition III, and achieved a classification accuracy of 91% on test set.     

Local orthogonal transform for a class of acoustic waveguides

There are some curved interfaces in acoustic waveguides. To compute wave propagation along the waveguides with some marching methods, flattening of the internal interfaces is needed. In this paper, a local orthogonal coordinate transform and an equation transform are constructed to solve the two-dimensional Helmholtz equation for the waveguides bounded by a flat top, a flat bottom and two curved internal interfaces with three layered media. The curved internal interfaces are flattened by the local orthogonal coordinate transform, and the corresponding transformed Helmholtz equation can be solved by some marching methods. This treatment can be extended in multilayered medium waveguides. The one-way reformulation based on the Dirichlet-to-Neumann (DtN) map is then used to reduce the boundary value problem to an initial value problem. Numerical implementation of the resulting operator Riccati equation uses a large range step method to discretize the range variable and a truncated local eigenfunction expansion to approximate the operators. This method is particularly useful for solving long range wave propagation problems in slowly varying waveguides with multilayered medium structure.     

微机原理实验教学改革探讨

总结了微机原理与接口技术实验教学改革的一些措施,通过更新实验内容,教学模式改革,实行开放式实验教学,有效地提高了学生的分析能力与创新能力.     

基于嵌入式Linux下MiniGUI的研究与移植

本文论述了MiniGUI在资源紧缺的嵌入式图形界面支持系统中所占的优势，并且对它的体系结构进行分析和研究。最后，通过实验证明了MiniGUI移植到ARM开发板的可行性。MiniGUI在开发板上的移植缩短了嵌入式软件的开发周期。     

论降低网页界面的视觉干扰

视觉干扰会影响用户时信息的正确判断，阻碍用户浏览网页体验度的提升，降低信息传达的效率减少网页界面视觉干扰应明确页面信息的主次关系．恰当地应用分类识别手法，合理地利用信息之间的视觉停顿并且弱化辅助元素的视觉强度。     

微机原理与接口技术课程研究性教学的探索与实践

“微机原理与接口技术”具有实践性强和应用灵活的特点,适合开展研究性教学.该文探讨了在研究性教学的实施过程中,通过设计教学环节、对教学过程进行有效控制以及开展综合评价讨论课,更好地提高该课程的教学效果.     

Modeling of multi-inclusion composites with interfacial imperfections: Micromechanical and numerical simulations

A micromechanical approach based on a two-layer built-in model and a numerical simulation based on boundary element method are proposed to predict the effective properties of the multi-inclusion composite with imperfect interfaces. The spring model is introduced to simulate the interface imperfection. These two methods are compared with each other, and good agreement is achieved. The effects of interface spring stiffness, volume ratio and stiffness of inclusions on the micro- and macro-mechanical behaviors ...     

复杂聚合物乳液的稳定性与电动电势的关系研究

利用界面电泳的方法对聚丙烯酸酯乳 液的稳定性及其影响因素进行了研究，结果表明，聚丙烯酸酯乳液的稳定性依赖于其内在结构，因含量、pH值和交联剂含量，这些影响因素可以用电荷密度及表面积的改变来解释。