Estimating the ultimate bound and positively invariant set for a generalized Lorenz system

A generalized Lyapunov function was employed to investigate the ultimate bound and positively invariant set of a generalized Lorenz system. We derived an ellipsoidal estimate of the ultimate bound and positively invariant set for the generalized Lorenz system, for all the positive values of system parameters a, b, and c. Our results extend the related result of Li, et al. [Li DM, Lu JA, Wu XQ, et al., Estimating the ultimate bound and positively invariant set for the Lorenz system and a unified chaotic system, Journal of Mathematical Analysis and Application, 2006, 323（2）： 844-653].     

一阶矩阵方程组的广义双半正定解

In this paper,a system of complex matrix equations was studied.Necessary and sufficient conditions for the existence and the expression of generalized bipositive semidefinite solution to the system were given.In addition,a criterion for a matrix to be generalized bipositive semitic.finite was determined.     

Vicente Gonξcalves 不等式的一个注记

In this paper,a new proof of the inequality of Vicente Goncalves was given.The method may be powerful to deal with some problems of polynomials.As an application,a new inequality for the coefficients of a polynomial and its roots was derived.     

一种切触有理插值在线性系统模型简化中的应用

A theorem for osculatory rational interpolation was shown to establish a new criterion of interpolation.On the basis of this conclusion a practical algorithm was presented to get a reduction model of the linear systems.Some numerical examples were given to explain the result in this paper.     

A generalized trajectory tracking controller for robot manipulators with bounded inputs

A generalized controller based on stability theory of singularly perturbed systems is proposed, to deal with the problem of bounded actuator inputs in robot trajectory tracking control. The saturation function with error-gain matrix is applied in the torque control law, which ensures the upper bound of torque inputs in any given limited range. Through appropriately setting the entries of the error-gain matrix, the tracking performance can be improved. Moreover, a pseudo signal is generated from a linear filter to substitute for the actual velocity error, eliminating the need for velocity measurements. Finally, to verify the effectiveness of the generalized controller, a new saturated controller with error-gain-contained arc tangent function is designed. Comparison experiments show that the proposed controller can strictly guarantee the bound of the torque inputs in situations with non-zero initial tracking errors, and gives a better tracking result than other controllers.     

Five Hundred Times

In the traffic court of a large mid-western city, a young lady was brought before the judge to answer a ticket given her for driving through a red light. She explained to his honor that she was a school teacher and     

WDM网络中任播请求的平衡分析

In this paper, the wavelength-routed WDM network, was analyzed for the dynamic case where the arrival of anycast requests was modeled by a state-dependent Poisson process. The equilibrium analysis was also given with the UWNC algorithm.     

关于二维系统Cayley-Hamilton定理

A new proof of the row Cayley-Hamilton theorem for 2-D system was given in this note. In a similar way, the Column Cay-ley-Hamilton theorem was also presented and proved.     

Aharonov-Bohm环中磁场调制的极化电导振荡

Oscillations of the spin-polarized conductance controlled by a uniform magnetic field in a modified Aharonov-Bohm ring is studied with use of one-dimensional quantum wave guide.Its expression at zero temperature is obtained as a function of the flux penetrating the ring and the magnetic field.It has been found that there are two kinds of polarized conductance extremas for a given Fermienergy.As Zeemann energy of spin-polarized electron in the stub is varied.one kind of extrema exhibits continuous phase shift .However,another is locked at particular values of phase shift and it can only change abrouptly from a maxima to a minima when Zeemann crosses the level of the bound state of isolated stub.This is a different mehanism for abrupt change phase of conductance osillations.     

Hybrid slip model for near-field ground motion estimation based on uncertainty of source parameters

The hybrid slip model used to generate a finite fault model for near-field ground motion estimation and seismic hazard assessment was improved to express the uncertainty of the source form of a future earthquake.In this process, source parameters were treated as normal random variables, and the Fortran code of hybrid slip model was modified by adding a random number generator so that the code could generate many finite fault models with different dimensions and slip distributions for a given magnitude.Furth...     

带给定切线多边形的可调广义Ball闭曲线

构造了与给定多边形相切的分段三次、五次和六次可调广义Ball曲线,所构造的曲线分别是C1,C2和C3连续,而且对切线多边形是保形的.曲线的所有控制点由切线多边形的顶点直接计算产生.给出了在保持公共连接点处相应连续的条件下内控制点的活动范围.曲线可以在一定范围内做局部修改.计算实例表明文中方法是灵活、方便、有效的.     

珍珠球防守意识中“概念模式”的建立

珍珠球运动作为少数民族传统体育竞赛项目,有其独特的竞赛健身特点。通过分析得出结论:珍珠球运动作为一项竞赛项目,其观赏性较高,并且对发展人体各项身体机能具有较好的锻炼价值。但这项运动还不太普及,技战术相对滞后。建议各级训练机构刻苦钻研,推陈出新从而更快推广和普及珍珠球运动的发展。     

珍珠球防守意识中“概念模式”的建立

珍珠球运动作为少数民族传统体育竞赛项目,有其独特的竞赛健身特点。通过分析得出结论：珍珠球运动作为一项竞赛项目,其观赏性较高,并且对发展人体各项身体机能具有较好的锻炼价值。但这项运动还不太普及,技战术相对滞后。建议各级训练机构刻苦钻研,推陈出新从而更快推广和普及珍珠球运动的发展。     

土家族棉花球运动在学校体育中的应用研究

详细介绍棉花球运动的发展,重点对它的观赏性、趣味性、锻炼价值及符合广大青年学生的生理、心理特点进行了分析。实践证明棉花球运动适合于在学校生存发展,具有一定的推广应用价值。     

Scheduling problems on tardiness penalty and earliness award with simply linear processing time

In this paper, a single-machine scheduling model with a given common due date and simple linear processing times was considered. The objective is the total weighted tardiness penalty and earliness award. Some polynomial time solvable cases for this problem are given. A dynamic programming algorithm was provided and a branch and bound algorithm for general case of the problem was provided based on a rapid method for estimating the lower bound.     

Reframing quality and impact: The place of theory in education research

In March 2004, Stephen Ball and others presented a symposium at the conference of the British Educational Research Association (BERA) on the necessity of theory in educational research. Like Ball, I have observed that theory, not just social theory, is a difficult space and one that divides researchers (those comfortable with theory and those less so), within educational research. It is an aspect of educational research training that rarely receives the attention essential for ‘quality’ educational research. In the context of the contemporary research assessment exercises, it is worth reflecting on the relationship between research informed by social theory and expectations of quality and impact. In this paper I revisit the argument made by Ball and others for the necessity of theory, and discuss its role in framing research questions, informing analysis, and promoting reflexivity on the significance and relevance of research. I illustrate this process by discussing the ways theory can assist in the generation of research agendas and questions. I conclude the paper with an example of how a team of educational researchers from Australia, UK and New Zealand have made use of social theory to inform an Australian Research Council (ARC) funded project investigating the recontextualisation of health knowledge in schools.     

球磨机CAI课件的研制

论述了球磨机CAI课件的开发过程。在课件开发过程中，课件所具备的功能、课件内容的系统性、科学性和正确性。课件应符合的规律及课件在学生使用时的学习方法。同时还阐述了球磨机CAI课件的脚本编写，软件制作，软件打包等内容。     

About the Editor and Contributors

In the last decade ‘quality’ has assumed the status of one of the meta-discourses across many domains of public policy, including education. This paper focuses on the specific example of quality policy in Australian higher education of the 1990s, and in particular, on the micro level of quality policy practice as experienced by academic practitioners in 6 universities. As such, it forms a follow-up to an article published earlier in the Journal of Education Policy (Vidovich and Porter 1997) which examined macro (national) and intermediate (the Committee for Quality Assurance in Higher Education) levels of a quality policy cycle consisting of contexts of influence, policy text production and practice, as articulated by Ball and colleagues (Bowe, Ball and Gold 1992, Ball 1994). The findings of in-depth interviews with key university personnel provide evidence of the ‘messy’ realities of the policy process and considerable variation in quality policy practices at local sites, particularly in terms of the different historical contexts of universities which were categorized as ‘traditional’, ‘alternative’ and ‘former college’ types. However, despite such variation, the ‘bigger picture’ effect of the quality policy under investigation was to enhance Australian national Government control of higher education, albeit at a ‘distance’, characteristic of the culture of performativity increasingly pervading higher education across many OECD countries. A further effect was to increase inequalities, both between and within universities.     

The EC Discourse on Vocational Training: How a ‘Common Vocational Training Policy’ Turned into a Lifelong Learning Strategy

This article traces the EC vocational training policy historically and describes the discursive alignments which brought the policy from a ‘common vocational training policy’ as laid down in Article 128, in the Treaty of Rome to the Lisbon Lifelong Learning strategy. The argument is that vocational training has served as a lever for the gradual expansion of the policy field into both general and higher education and for the establishment of a European discourse on Lifelong Learning. In the article, Ball’s concept of “policy as discourse” is used to identify the changing spaces of possibility within EC vocational training policy (Ball, What is policy? Texts, trajectories and toolboxes. Discourse, 13(2), 1993).     

Higher education and attainment of policy goals: Interpretations for efficiency indicators in Israel

This study concerns identification of policy aims and goals in Israeli Higher Education (HE) and an analysis of efficiency indicators to determine the extent and nature of HE policy goal attainment at the Israeli universities. Overall, these indicators, be they quantitative or qualitative, point to major developments in the Israeli HE system in both national and international comparative terms. The aims and related efficiency performance indicators identified and used in this study are normative and their analysis follows conceptualizations of efficiency assessment. They are in line with orientations of quality as bound up with values and fundamental aims relating to fitness for purpose (Ball 1985; Williams 1991; Barnett 1989, 1992; vanVught 1994) and pertain mainly to the individual universities' perceptions and priorities. The analysis model also adopts conceptual approaches used in studies of HE quality by the Planning and Budgeting Committee of the Israeli HE Council, as well as those conducted in England, Scotland, and the Netherlands, and by the OECD. As such, the analysis model as well as the findings identified in this study lend themselves to comparative HE policy analysis in a global perspective.