Roy分形分抗逼近电路的运算特征与逼近性能分析

从新的分数阶微积分概念出发,根据分抗逼近电路的数学原理,首次全面考察各型Roy分形分抗逼近电路的运算特征与逼近性能。引入阶频特征函数并结合相频特征函数来表征分抗、分抗逼近电路的运算特征。依据分抗逼近电路的频域性能参数,从阶频与相频两方面进行直观、全面地性能分析。首先由连分式迭代算法公式,数值算出各型Roy分形分抗逼近电路的阻抗函数序列,进而获得阶频特征、相频特征函数、逼近带宽指数,最后精确求出各型Roy分形分抗逼近电路的K指标、O指标、P指标,逼近效益等刻画分抗运算特征与逼近性能的参数。数值仿真表明,阶频特征与相频特征直观刻画Roy分形分抗逼近电路的运算特征,是分析分抗、分抗逼近电路以及分数阶电路与系统运算性能的数学基础。采用频域性能指标在分析不同类型的分抗逼近电路的逼近性能时具有统一的定量分析标准。

在本体中如何表达对象特征的运算框架

本体的对象特征(Object Property,OP)的运算语境在《生物医学知识整合论》一书中被称为"概念的语境变量框架"(Frame of Contextual Variable of Concept,FCVC),简称为对象特征的"运算框架"(Computing Frame,CF)。当用Protege建立本体时,一般只能根据对象特征的数学特征加以定义,这些数学特征包括定义域,值域,反关系,是否为函数,是否具有对称性,反对称性,自返性和传递性等,因而事实上用传统的Protege方法是无法表达CF的。根据这类定义,计算机和应用程序是无法理解和处理一个OP的运算语境,因而只能对由该OP驱动的相应的断言"一知半解"。探索的一种新方法引入一种新型的认知和操作类Ob jectPropertyEntityConcept-OPEC作为OP的对应体,并放置于实体类树结构中;借助这种新型类,就能利用Protege对实体类的强大的定义功能(与对OP类的定义功能相比较而言)对相应的0P的CF作定义,从而使计算机和应用程序获得阅读和理解0P的运算语境的机会,并进而对由该OP驱动的断言获得更深的理解。

支持异种材料体造型的特征布尔运算

针对传统CAD不能提供材料等非几何信息,且无法实现异种材料物体间的布尔运算,提出了一种可应用于构造异种材料物体的特征布尔运算,包含了由材料决定的布尔差和交运算及新的布尔复形并运算,由特征合并和特征抽取两步完成;并给出了该运算的几何实现、实现算法及实例·

分抗的F特征逼近性能分析原理与应用

F特征函数是描述分抗逼近电路集总特征值的新概念.为全面定量分析与表征分抗逼近电路的F特征逼近性能,在F特征函数基础上,提出F特征逼近性能分析的相对误差、精度、带宽、带宽指数、K线斜率图、F指标和逼近效益等一系列概念及相应的数学函数.并将其应用到Oldham分形链分抗逼近电路的F特征逼近性能分析,以证明其有效性.

基于Multisim的分形分抗逼近电路仿真分析

对于经典的Oldham分形链类分抗逼近电路,根据分形分抗迭代电路,首先在理论上推导出归一化迭代方程,归一化方程在数学上表征了分形分抗逼近电路的运算特征。运用Multisim软件对分抗电路进行仿真分析,通过交流分析方法得到OldhamⅠ型链分抗电路随着逼近级次数变化的幅频特征和相频特征曲线,将幅频特征数据导入Matlab进行差分求导得出阶频特征曲线,应用蒙特卡罗分析方法进行容差分析,求出电路元件参数对分抗电路运算性能的影响。

基于动态互馈模拟的半分布式水资源综合调度模型

由于区域水资源循环过程呈现显著二元特性,自然水资源与社会经济发展间存在互相影响与制约的关系,因此需深入研究自然水循环与社会水循环间的动态互馈关系.为此,设计了基于动态互馈模拟的半分布式水资源综合调度模型,采用“实测、分离、聚合、建模、调控”的水资源循环时序动态反馈模拟方法设计调度模型架构,调度模型包括产汇流模块、再生水模块及水资源调度模块,基于单元内部的运算特征、单元间的运算特征和与河道汇流循环特征完成水资源系统单元的动态、联动、互馈的水资源模拟与调度.试验结果表明,所设计模型径流模拟平均误差率为4.25%,水资源调度总量误差为1.46%,达到水资源调度的要求;且与对比模型相比独具动态互馈功能,模拟与调度性能更优.

基于Matlab的AHP分析程序设计

层次分析法是目前最为广泛应用的决策方法,但涉及大量的矩阵运算,影响了该方法的推广。Matlab软件精于矩阵运算,与C语言结构类似,移植性强,本研究基于Matlab设计出了便捷高效的AHP计算机程序。

Dynamics and screening characteristics of a vibrating screen with variable elliptical trace

The ideal motion characteristics for the vibrating screen was presented according to the principle of screening process with constant bed thickness.A new vibrating screen with variable elliptical trace was proposed.An accurate mechanical model was constructed according to the required structural motion features.Applying multi-degree-of-freedom vibration theory,characteristics of the vibrating screen was analyzed.Kinematics parameters of the vibrating screen which motion traces were linear,circular or elliptical were obtained.The stable solutions of the dynamic equations gave the motions of the vibrating screen by means of computer simulations.Technological parameters,including amplitude,movement velocity and throwing index,of five specific points along the screen surface were gained by theoretical calculation.The results show that the traces of the new designed vibrating screen follow the ideal screening motion.The screening efficiency and processing capacity may thus be effectively improved.

艺术品智能鉴定系统的设计与实现

该艺术品智能鉴定系统由硬件部分和软件部分组成。系统的硬件部分主要利用ES1100串口服务器进行数据传输和通信,并通过NHRO-SCP开关对多媒体设备进行控制。软件部分是基于.NET平台的Winfrom窗体客户端,主要通过TCP/IP协议与串口服务器进行通信,可实时显示设备的运行状态,并通过RS-485开关对设备进行控制。整体平台采用C/S架构与MVC框架来完成高校分布式集中控制系统的设计,该系统不仅能给管理人员带来便利,同时还能达到节约能源,提供安全性保障的目的。

Investigation of Image Fusion Between High-Resolution Image and Multi-spectral Image

On the basis of a thorough understanding of the physical characteristics of remote sensing image, this paper employs the theories of wavelet transform and signal sampling to develop a new image fusion algorithm. The algorithm has been successfully applied to the image fusion of SPOT PAN and TM of Guangdong province, China. The experimental results show that a perfect image fusion can be built up by using the image analytical solution and re-construction in the image frequency domain based on the physical characteristics of the image formation. The method has demonstrated that the results of the image fusion do not change spectral characteristics of the original image.

A Mixed Reality System for Investigating Expert Characteristics on Recall of Situation Including Self-Motion

To study recall accuracy of the offensive and defensive situations including movements of elite-athlete/novice oneself, a novel experimental system was developed where defensive actions were performed by the subject with a CG （Computer Graphics） player who presented predetermined offensive actions. Both the CG player＇s movements and subject＇s movements were reproduced by a video using mixed reality technology for recall examination. This system was also designed to rearrange the natural sequence of image frames resulting in a reproducible video in which the time relation of offense and defense was falsified. Displacement of timing in the false video was twofold; delayed from the truth or advanced from the truth. Using this two-video, true/false imagery method, the subject was asked to select the true video by recall; thus it became possible to examine the recall accuracy quantitatively by controlling the timing displacement. Results of the experiment using this system revealed that karate expert possessed a skill to recognize the time relation between the opponent＇s movement and one＇s own movement perceptually that was more developed than that of the novice. It was further identified that the expert as well as the novice recognized delayed displacement more accurately than they could recognize advanced displacement.

Operational Modal Analysis of a Ship Model in the Presence of Harmonic Excitation

A ship is operated under an extremely complex environment, and waves and winds are assumed to be the stochastic excitations. Moreover, the propeller, host and mechanical equipment can also induce the harmonic responses. In order to reduce structural vibration, it is important to obtain the modal parameters information of a ship. However, the traditional modal parameter identification methods are not suitable since the excitation information is difficult to obtain. Natural excitation technique-eigensystem realization algorithm （NExT-ERA） is an operational modal identification method which abstracts modal parameters only from the response signals, and it is based on the assumption that the input to the structure is pure white noise. Hence, it is necessary to study the influence of harmonic excitations while applying the NExT-ERA method to a ship structure. The results of this research paper indicate the practical experiences under ambient excitation, ship model experiments were successfully done in the modal parameters identification only when the harmonic frequencies were not too close to the modal frequencies.

Economy of Energy during Refrigerating Machine Operation

Idealized cycles of refrigerating machines with adiabatic and isothermal compression of refrigerant vapor were investigated. Energetic characteristics of cycles： specific mass and volume cooling capacity q0 and qv, work of compression 1, refrigerating coefficient of performance e and power N for drive of compressor were compared. These characteristics were calculated for eight refrigerants at temperature of their condensation 30 ℃ and temperatures of boiling -15℃ and -30 ℃. The calculations show that the use of isothermal compression of refrigerant vapor ensures economy of energy during refrigerating machine operation.

Additional symmetries of constrained CKP and BKP hierarchies

The additional symmetries of the constrained CKP (cCKP) and BKP (cBKP) hierarchies are given by their actions on the Lax operators, and their actions on the eigenfunction and adjoint eigenfunction {Φ i , Ψ i } are presented explicitly. Furthermore, we show that acting on the space of the wave operator, *k forms new centerless W cC 1+∞ and W cB 1+∞ -subalgebra of centerless W 1+∞ respectively. In order to define above symmetry flows *k of the cCKP and cBKP hierarchies, two vital operators Y k are introduced to revise the additional symmetry flows of the CKP and BKP hierarchies.

Joint eigenfunctions of invariant differential operators on the quaternion Heisenberg group

Let L be the sublaplacian on the quaternion Heisenberg group N and T the Dirac type operator with respect to central variables of N. In this article, we characterize the He-valued joint eigenfunctions of L and T having eigenvalues from the quaternionic Heisenberg fan.