Xem 1-20 trên 66 kết quả Stability conditions
  • This paper introduces the notion of a stability condition on a triangulated category. The motivation comes from the study of Dirichlet branes in string theory, and especially from M.R. Douglas’s work on Π-stability. From a mathematical point of view, the most interesting feature of the definition is that the set of stability conditions Stab(D) on a fixed category D has a natural topology, thus defining a new invariant of triangulated categories.

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  • Lecture "Fundamentals of control systems - Chapter 8: Analysis of discrete control systems" presentation of content: Stability conditions for discrete systems, extension of Routh - Hurwitz criteria, jury criterion, root locus,... Invite you to reference.

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  • In the five years since the first edition of this book was published, there has been an explosion in new information relating to the nature of dry skin and its treatment. Investigators from various disciplines, including dermatologists, pharmacists, chemists, biochemists, molecular biologists, physiologists, pharmacologists, and even psychologists have advanced our knowledge tremendously. We now understand that the stratum corneum has a surprisingly large number of functions in maintaining the physiologic stability and homeostasis of the skin and mind.

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  • FUZZY DESCRIPTOR SYSTEMS AND CONTROL This chapter deals with a fuzzy descriptor system defined by extending the original Takagi-Sugeno fuzzy model. A number of stability conditions for the fuzzy descriptor system are derived and represented in terms of LMIs. A motivating example for using the fuzzy descriptor system instead of the original Takagi-Sugeno fuzzy model is presented. An LMI-based design approach is employed to find stabilizing feedback gains and a common Lyapunov function.

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  • Weathering steel is NYSDOT’s first choice for steel multi-girder bridges under most conditions. This decision has been made in part because of the cost savings that can be realized due to decreased painting and maintenance requirements. However, recent studies have shown that this may not always be the case. This presentation will discuss some situations where bridges with weathering steel are underperforming and whether or not the situation can be rectified for future applications.

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  • With this approach the geometry and structure aspects of the bridge must be known (such as the depth of the girder, the connection between the beams and deck, steel detailing, steel strength, etc.). With this information and assumptions and boundary conditions for load distribution along with the characteristics, analysis of the beam line can then be carried out and the load factor assessment development (AASTHO, 1994).

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  • Sampling Biorthogonal Time Domain Method (SBTD) The finite difference time domain (FDTD) method was proposed by K. Yee [1] in 1966. The simplicity of the FDTD method in mathematics has proved to be its great advantage. The method does not involve any integral equations, Green’s functions, singularities, nor matrix equations. Neither does it involve functional or variational principles. In addition the FDTD proves to be versatile when used in complicated geometries.

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  • There is no general consensus on how to define various risk-related terms, including the term “risk” itself, and people may have different views on how those terms apply to their particular organization. Both fund boards and advisers would benefit from establishing a common understanding of the terms and concepts they use in risk-related discussions, as well as how they apply to their funds. Some advisers include definitions or descriptions of how they view risk and risk management in their board presentations.

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  • NEW STABILITY CONDITIONS AND DYNAMIC FEEDBACK DESIGNS This chapter presents a unified systematic framework of control synthesis w1 5x for dynamic systems described by the Takagi-Sugeno fuzzy model. In comparison with preceding chapters, this chapter provides two significant extensions. First we provide a new sufficient condition for the existence of a quadratically stabilizing state feedback PDC controller which is more general and relaxed than the existing conditions.

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  • STABILITY FOR DELAYED GENERALIZED 2D DISCRETE LOGISTIC SYSTEMS CHUAN JUN TIAN AND GUANRONG CHEN Received 28 August 2003 and in revised form 19 February 2004 This paper is concerned with delayed generalized 2D discrete logistic systems of the form xm+1,n = f (m,n,xm,n ,xm,n+1 ,xm−σ,n−τ ), where σ and τ are positive integers, f : N2 × R3 → 0 R is a real function, which contains the logistic map as a special case, and m and n are nonnegative integers, where N0 = {0,1,...} and R = (−∞, ∞). Some sufficient conditions for this system to be stable and exponentially stable...

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  • This material is taught in the BSc. Mathematics degree programme at the Manchester Metropolitan University, UK. The Finite Volume Method (FVM) is taught after the Finite Difference Method (FDM) where important concepts such as convergence, consistency and stability are presented. The FDM material is contained in the online textbook, ‘Introductory Finite Difference Methods for PDEs’ which is free to download from:

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  • The economy has made considerable progress in shaking off the legacy of the 2001 economic crisis and is on a path of growth and increased trade integration, underpinned by improved macro- economic stability and structural reforms. During the last five years real GDP growth has been impressive, with an annual average growth rate of 6.9%; inflation fell from an average of 77.

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  • Following are writing samples that have been annotated to illustrate the criteria required to meet the Common Core State Standards for particular types of writing—argument, informative/explanatory text, and narrative—in a given grade. Each of the samples exhibits at least the level of quality required to meet the Writing standards for that grade. The range of accomplishment within each grade reflects differences in individual development as well as in the conditions under which the student writers were expected to work.

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  • Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Research Article Explicit Conditions for Stability of Nonlinear Scalar Delay Impulsive Difference Equation Bo Zheng

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  • EXISTENCE AND GLOBAL STABILITY OF POSITIVE PERIODIC SOLUTIONS OF A DISCRETE PREDATOR-PREY SYSTEM WITH DELAYS LIN-LIN WANG, WAN-TONG LI, AND PEI-HAO ZHAO Received 13 January 2004 We study the existence and global stability of positive periodic solutions of a periodic discrete predator-prey system with delay and Holling type III functional response. By using the continuation theorem of coincidence degree theory and the method of Lyapunov functional, some sufficient conditions are obtained. 1.

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article New LMI-Based Conditions for Quadratic Stabilization of LPV Systems

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  • GLOBAL ASYMPTOTIC STABILITY OF SOLUTIONS OF CUBIC STOCHASTIC DIFFERENCE EQUATIONS ALEXANDRA RODKINA AND HENRI SCHURZ Received 18 September 2003 and in revised form 22 December 2003 Global almost sure asymptotic stability of solutions of some nonlinear stochastic difference equations with cubic-type main part in their drift and diffusive part driven by square-integrable martingale differences is proven under appropriate conditions in R1 .

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  • ASYMPTOTIC ESTIMATES AND EXPONENTIAL STABILITY FOR HIGHER-ORDER MONOTONE DIFFERENCE EQUATIONS ´ EDUARDO LIZ AND MIHALY PITUK Received 21 May 2004 Asymptotic estimates are established for higher-order scalar difference equations and inequalities the right-hand sides of which generate a monotone system with respect to the discrete exponential ordering. It is shown that in some cases the exponential estimates can be replaced with a more precise limit relation.

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  • There are 4 million miles of roads in the United States. One hundred years ago, roads were primarily unpaved and had half the number of miles of the present U.S. road system. As the system grew, roads became wider and more complex structurally to provide for more and heavier traffic. New construction technology and greater structural stability were needed to improve the road system. All phases of road development—from construction and use by vehicles to maintenance—affect physical and chemical soil conditions, water flow, and air and water quality.

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  • Tax credits, if combined with outreach and education efforts and other complementary incentives (such as net metering), can also help drive the market for renewables. Clearly, states cannot expect any one of these incentives by itself to remove all the barriers to renewable energy technology development. This study provides some potent examples of program design and implementation elements that have enhanced and limited program effectiveness.

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