Uncertain impulsive differential systems of fractional order: almost periodic solutions

In this paper, we investigate the existence and stability of almost periodic solutions of impulsive fractional-order differential systems with uncertain parameters. The impulses are realised at fixed moments of time. For the first time, we determine the impact of the uncertainties on the qualitative behaviour of such systems. The main criteria for the existence of almost periodic solutions are proved by employing the fractional Lyapunov method. The global perfect robust uniform-asymptotic stability of such solutions is also considered. We apply our results to uncertain impulsive neural network systems of fractional order.     

锅炉汽包水位的复合控制研究

针对工业生产中锅炉汽包的水位控制问题,分析了3种影响锅炉汽包水位控制的因素：给水扰动、蒸汽量扰动、燃料量扰动.介绍了锅炉汽包水位的3种控制方案：单冲量控制、双冲量控制和三冲量控制.对这3种控制方案比较后认为,锅炉汽包水位的三冲量控制是更合理的控制方案.使用和利时MACSV5.2.4软件进行组态,按照项目实施的过程,进行测点统计、控制器正反作用判断,并按照锅炉水位三冲量控制方案进行编程和画图.在生产中,工艺人员只在图形上操作,即可完成对锅炉汽包水位的控制.     

Response of dynamic systems to renewal impulse processes: Generating equation for moments based on the integro-differential Chapman–Kolmogorov equations

In the present paper the method is developed for the derivation of differential equations for statistical moments of the state vector (response) of a non-linear dynamic system subjected to a random train of impulses. The arrival times of the impulses are assumed to be driven by a non-Poisson counting process. The state vector of the dynamic system is then a non-Markov process and no method is directly available for the derivation of the equations for response moments. The original non-Markov problem is converted into a Markov one by recasting the excitation process with the aid of an auxiliary, pure-jump stochastic process characterized by a Markov chain. Hence the conversion is carried out at the expense of augmentation of the state space of the dynamic system by auxiliary Markov states. For the augmented problem the sets of forward and backward integro-differential Chapman–Kolmogorov equations are formulated. The general, generating equation for moments is obtained with the aid of the forward and backward integro-differential Chapman–Kolmogorov operators. The developed method is illustrated by the examples of several renewal impulse processes.     

On the formation of delusions.

Four principles are identified that account for most delusion formation. The most important of these is transference--transference to the world at large. The second is the defense against pseudohomosexual impulses as described by Freud (and generally misunderstood). The third is the learning within the family of bizarre meanings of concepts which are assumed erroneously to be the meanings other people use. The fourth is the need to have a more or less consistent understanding of one's life and experiences. Therapeutic implications are drawn. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于小波时频框架分解方法的滚动轴承故障诊断

损伤点通过其它元件时引起的周期性冲击是判断滚动轴承局部损伤故障的关键特征信息.针对滚动轴承的振动特点,设计了小波时频框架,利用框架分解方法在匹配信号特征结构,直接提取特征信息方面的优势,分析了滚动轴承的振动信号.根据框架分解结果,在时频联合域内清晰直观地提取了滚动轴承局部损伤故障的周期性冲击特征,识别了滚动体、内圈和外圈的单点缺陷,与小波变换的对比验证了框架分解在检测滚动轴承局部损伤故障方面的有效性.     

Search for Fullerenes in Geological Carbonaceous Samples Altered by Experimental Lightning

Three rocks with different organic carbon content, graptolitic shale, metamorphosed black schist and bituminous coal, have been subjected to high-energy electric impulses of current amplitudes comparable to lightnings that form fulgurites. Search for fullerenes has been done directly on altered surfaces using infrared spectroscopy. Toluene extractable material from altered samples has been investigated by means of high-performance liquid chromatography (HPLC) and electron-impact ionization mass spectroscopy (EI-MS) for the presence of fullerenes. Two peaks characteristic for fullerenes can be observed in infrared spectrum of one sample of metamorphosed black schist, but no C₆₀ fullerene has been detected using HPLC and EI-MS either in this sample or in bituminous coal and graptolitic shale.     

An experimental reunion of psychoanalytic theory with perceptual vigilance and defense.

"This experiment was designed to test, within the framework of perceptual behavior, two psychoanalytic hypotheses: (a) the unconscious striving for expression of underlying psychosexual impulses (vigilance); and (b) the warding off of these threatening impulses as they begin to approach conscious awareness (defense)." Using Blacky Pictures, the vigilance hypothesis was supported in 11 of the 14 cases tested; the defense hypothesis was supported in 12 of the 14 cases tested. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

工业锅炉汽包水位模糊自适应PID控制研究

针对汽包锅炉给水过程的特点，采用了一种模糊自适应PID控制器，将该控制器应用于锅炉汽包水位三冲量控制系统，以期望达到水位的静特性．MATLAB仿真结果表明，与传统PID控制器相比，该控制器取得了良好的动静态性能和鲁棒性能．     

Integro-differential Chapman-Kolmogorov equation for continuous-jump Markov processes and its use in problems of multi-component renewal impulse process excitations

In the present paper the applications of the integro-differential Chapman-Kolmogorov equation to the problems of pure-jump stochastic processes and continuous-jump response processes are discussed. The pure-jump processes considered herein are the counting Poisson process, a two-state jump process, and a multi-state jump process. The differential equations governing the Markov state probabilities are obtained from the degenerate, pure differential form, of the general, integro-differential Chapman-Kolmogorov equation, with the aid of the jump probability intensity functions. The continuous-jump response process is the response of a dynamic system to a multi-component renewal impulse process excitation. The excitation consists of a number of n statistically independent random trains of impulses, each of which is driven by an Erlang renewal process with parameters ν_j,k_j. Each of the impulse processes is characterized by an auxiliary zero-one jump stochastic process, which consists of k_j negative exponential distributed phases. The Markov states for the whole problem are determined by the coincidences of the phases of the individual jump processes. Thus the response probability distribution may be characterized by a joint probability density-discrete distribution of the state variables of the dynamic system and of the states of the pertinent Markov chain. The explicit integro-differential equations governing the joint probability density-discrete distribution of the response are obtained from the general forward integro-differential Chapman-Kolmogorov equation, after the determination of the jump probability intensity functions for the continuous-jump and pure-jump processes.