Refractive-diffractive visual system for micro-display of LCOS

One head-mounted display visual system for computer entertainment and three-dimensional display of virtual-reality was achieved, which consists of a hybrid refractive-diffractive eyepiece and a relay reflector. It can be used in micro-display of liquid crystal on silicon (LCOS) diagonal of 18 mm. The whole system has better performance, with 60° field of view, 10 mm exit pupil, 23 mm eye relief, and reduces weight and size.     

MkdV方程族的换位表示及其相应的Liouville完全可积系统

本文给出了ＭｋｄＶ方程族的换位表示及一个有限维对合系，并讨论了Ｂａｒｇｍａｎｎ约束和Ｃ．Ｎｅｕｍａｎｎ约束及其相应的定态ＭｋｄＶ系统。最后，我们得到ＭＫｄＶ方程族的对合解。     

双图改进节点法及其应用

与其它方法相比，通过用双图法建立电路网络方程组，可以大大地降低方程组的阶数，显著减少非零元。在处理含有较多受控电压源和受控电流源或短路的电路，其效果较为明显，尤其是处理开关电容电路。并且，双图法还适用于一些特殊的非线性电路。     

关于数理逻辑在解决数学命题中的探讨

在解决、论证数学命题过程中 ,准确使用逻辑思维方法 ,可使具体解题步骤严谨周密 ,条理清晰 ,形成完整的推理体系     

插筋纵梁在山西引黄北干隧洞开挖中的应用

以山西引黄北干支北04主洞段开挖为例,介绍了在围岩洞开挖施工中成功的采用插筋纵梁取代超前锚杆的方法,结合施工实践,从插筋纵梁的选择、工作原理、设计参数等方面总结了插筋纵梁用于隧洞开挖的经验。     

岩基静荷试验方法及其适用条件分析

根据反力系统的不同 ,介绍了几种岩基载荷试验方法———堆载平台法、锚杆反力梁法、锚桩反力梁法、护壁反力法、斜壁支撑法等 ,并对其适用条件从经济、安全等方面进行了分析     

聚合物薄膜和纤维的强度及寿命的统计学性质

这本专著是由1999年出版的俄语版《高分子膜的强度和破裂》一书修订和扩充而来的。书中展示了作者在脆性和准脆性断裂的固态高分子方面长期做的理论性和实验研究的结果。作者对各种状况下聚合物断裂的统计学特性进行了综合而详细的研究，包括不同的温度、不同的机械应力、不同表面活性媒质、紫外线和1光照射、化学混合物作用等等各种不同条件下的统计学特性。该研究的关键在于发现了两种主要的强度状态：块体试样的低强度状态和纤维及薄膜的高强度状态。书中详细研究了这两种强度状态下的破裂模型的差别。     

电荷掺杂和杂原子掺杂聚硅烷的比较性理论研究

本文利用GAUSSIAN 03程序包中的密度泛函理论,在B3LYP/6-31G(d)水平下,对聚21硅烷、电荷掺杂的聚21硅烷以及杂原子(硼和磷)掺杂的聚21硅烷进行几何全优化,并对它们的几何结构和自旋密度进行了比较性理论研究.结果表明,电荷掺杂能使聚硅烷的Si—Si键长增长,其极子分布几乎遍及了聚21硅烷的整个链;而杂原子(B、P)的掺杂对聚硅烷的影响主要集中在与B、P原子相邻的Si原子上,极子分布仅局域在B、P原子附近的3~5个原子上.     

Forecasting volatility by means of threshold models

The aim of this paper is to compare the forecasting performance of competing threshold models, in order to capture the asymmetric effect in the volatility. We focus on examining the relative out‐of‐sample forecasting ability of the SETAR‐Threshold GARCH (SETAR‐TGARCH) and the SETAR‐Threshold Stochastic Volatility (SETAR‐THSV) models compared to the GARCH model and Stochastic Volatility (SV) model. However, the main problem in evaluating the predictive ability of volatility models is that the ‘true’ underlying volatility process is not observable and thus a proxy must be defined for the unobservable volatility. For the class of nonlinear state space models (SETAR‐THSV and SV), a modified version of the SIR algorithm has been used to estimate the unknown parameters. The forecasting performance of competing models has been compared for two return time series: IBEX 35 and S&P 500. We explore whether the increase in the complexity of the model implies that its forecasting ability improves. Copyright © 2007 John Wiley & Sons, Ltd.     

Weight measurement using image-based pose analysis

Image-based gait analysis as a means of biometric identification has attracted much research attention. Most of the existing methods focus on human identification, posture analysis and movement tracking. There have been few investigations on measuring the carried load based on the carrier＇s gait characteristics by automatic image processing. Nevertheless, this measurement is very useful in a number of applications, such as the study of the carried load on the postural development of children and adolescence. In this paper, we investigate how to automatically estimate the carried weight from a sequence of images. We present a method to extract human gait silhouette based on an observation that humans tend to minimize the energy during motion. We compute several angles of body leaning and determine the relationship of the carried weight, the leaning angles and the centroid location according to a human kinetic study. Our weight determination method has been verified successfully by experiments.