8098单片机控制下的斜井绞车多功能信号系统

介绍了一个用8098单片机控制的集通讯、打点、显示、存储 、打印及报警于一体的斜井多功能信号系统。从软件、硬件、技术关键等几方面阐述了其系 统,解决了时钟、日期、按键、串行显示、并行显示、抗干扰、长距离传输、普通电缆可靠 传输高速数据等关键问题。     

新型Au/TiO_2纳米管的制备及其在化学需氧量测定中的应用研究

该文首次用光电催化的方法,在TiO2纳米管中嵌入金纳米粒子,新材料可以促进界面间电子的传递,有助于电子和空穴对的分离,进而提高光催化效率.对Au/TiO2纳米管进行扫描电子显微镜(SEM),色散型X射线能谱(EDX)和X射线衍射(XRD)表征,结果表明金纳米粒子被成功嵌入TiO2纳米管中,形成蜂窝状结构.将该材料首次用于光电催化法化学需氧量(COD)的测定,发现该传感器的光电流值在1～800mg/L范围内与COD值有良好的线性响应,检测限为0.3 mg/L.利用该传感器测定实际水样的COD值,结果与传统的K2Cr2O7标准方法有较好的一致性.     

Espaces métriques rationnellement présentés et complexité, le cas de l'espace des fonctions réelles uniformément continues sur un intervalle compact

We define the notion of rational presentation of a complete metric space, in order to study metric spaces from the algorithmic complexity point of view. In this setting, we study some representations of the space C[0,1] of uniformly continuous real functions over [0,1] with the usual norm: ||f||_∞ = Sup{|f(x)|; 0x1}. This allows us to have a comparison of global kind between complexity notions attached to these presentations. In particular, we get a generalization of Hoover's results concerning the Weierstrass approximation theorem in polynomial time. We get also a generalization of previous results on analytic functions which are computable in polynomial time.     

飞机余度舵机系统鲁棒故障诊断

提出一种利用特征结构配置与状态反馈解耦相结合设计观测器的方法,实现余度伺服系统的鲁棒故障诊断,利用特征结构方法,可以实现残差与结构性干扰解耦;利用对偶原理,进行解耦观测器设计,可使残差不受交联作用影响,利用这两种方法中参数设计的自由度,使其互相逼近,做到在干扰解耦的基础上,故障最大程度地实现通道解耦,该方法不仅适用于突变故障,而且也适用于渐变故障和多故障的诊断。     

On the bounded-real and positive-real conditions for affine nonlinear state-delayed systems and applications to stability

In this paper, bounded-real conditions for affine nonlinear state-delayed systems are derived using the concept of dissipativeness. Necessary and sufficient conditions for the system to be dissipative and to have finite L₂-gain also referred to as the bounded-real condition are given. The implications on the stability of the system and feedback interconnections of such systems are also considered. Finally, an equivalent of the positive-real lemma is derived and its implications on stability of the system and feedback interconnections of such systems are similarly discussed.     

基于内容的视频浏览界面的设计与实现

基于内容的视频浏览是在基于内容视频检索领域中,技术现状无法满足应用需求情况下的一种折衷手段。ＶｉｄｅｏＣＡＲ是我们设计的一个用于视频内容分析与表现的原型实验平台。在该系统的界面设计中我们充分利用面向对象的设计思想和 ＭＦＣ提供的各种ＡｃｔｉｖｅＸ控件,解决了在屏幕空间有限的条件下提供有效导航机制和高效内容表现的问题,提供了多种浏览手段,帮助用户在各个层次上快速定位感兴趣的视频资料。本文介绍了该系统界面的设计要点和主要实现方法。     

Functional linear regression after spline transformation

Functional linear regression has been widely used to model the relationship between a scalar response and functional predictors. If the original data do not satisfy the linear assumption, an intuitive solution is to perform some transformation such that transformed data will be linearly related. The problem of finding such transformations has been rather neglected in the development of functional data analysis tools. In this paper, we consider transformation on the response variable in functional linear regression and propose a nonparametric transformation model in which we use spline functions to construct the transformation function. The functional regression coefficients are then estimated by an innovative procedure called mixed data canonical correlation analysis (MDCCA). MDCCA is analogous to the canonical correlation analysis between two multivariate samples, but is between a multivariate sample and a set of functional data. Here, we apply the MDCCA to the projection of the transformation function on the B-spline space and the functional predictors. We then show that our estimates agree with the regularized functional least squares estimate for the transformation model subject to a scale multiplication. The dimension of the space of spline transformations can be determined by a model selection principle. Typically, a very small number of B-spline knots is needed. Real and simulation data examples are further presented to demonstrate the value of this approach.     

“不以其道得之”再探

《论语·里仁》:"贫与贱,是人之所恶也;不以其道得之,不去也。"历来多有歧解。解决这个问题的关键在于对"得"的理解。若将"得"理解为"有得、得利",则非常通畅。而"得之"的"之",是代词,位于动词"得"的后面,意义已经虚化,主要起强调动词的作用。此句义指:贫与贱,是人人都不希望得到的,但如果不按正道而得利,君子将不去除贫贱(即安于贫贱)。孔子的言行,恰好证明了他的这句话。     

徽州传统建筑木构件力学参数实验研究

徽州传统建筑多以木构件作为承重体系,木构件力学参数实验可以真实的反映木构件的力学性能,本文运用理论分析与实验相结合的研究方法,进行了传统建筑木构件顺纹抗压强度等力学参数的试验,给出了具体实验程序并进行了相关分析,研究成果可为徽州传统建筑的加固修复提供设计依据.     

Cryobank of plant genetic resources in Russian Academy of Sciences

Cryopreservation is the most reliable method for long-term storage of plant genetic resources. A review of cell injury by ice crystals and dehydration during a freeze–thaw cycle is given. For successful regeneration of plants and cultures after cryopreservation of their cells, the development of reliable cryopreservation procedure is required including preliminary cultivation, treatment by cryoprotectors, freezing by different methods, thawing and recultivation. Up to now 27 cell lines successfully resumed their growth after storage in liquid nitrogen and preserved their specific features and biosynthetic potential. Besides, shoot tips of 40 cultivars of potato, rose, strawberry and raspberry regenerated plants both in vitro and in vivo after cryopreservation. The longest storage duration was 25 years. Now in liquid nitrogen we continuously store 24 cell strains of rare medicinal plants, shoot tips of seven cultivars of strawberry and raspberry and seeds of 250 endangered plant species collected over all Russian territory.