نتایج جستجو برای: t criteria
تعداد نتایج: 945465 فیلتر نتایج به سال:
A new baseband formulation of the coupled cavity/longitudinal-bunch ODEs is derived. Assuming linearity, a model of the form _ x(t) = A(t)x(t) +B(t)u(t) arises, where A(t) and B(t) are piecewise constant, and periodic with the revolution period To. Such models, known in the control community as (periodic) switched systems, have known (in)stability criteria and control theoretic properties, whic...
First, existence criteria for at least three nonnegative solutions to the following boundary value problem of fourth-order difference equation Δ4x(t− 2) = a(t) f (x(t)), t ∈ [2,T], x(0)= x(T +2)=0, Δ2x(0)=Δ2x(T)=0 are established by using the well-known LeggettWilliams fixed point theorem, and then, for arbitrary positive integerm, existence results for at least 2m− 1 nonnegative solutions are ...
Some oscillation criteria are given for the second order matrix differential system Y ′′ +Q(t)Y = 0, where Y and Q are n× n real continuous matrix functions with Q(t) symmetric, t ∈ [t0,∞). These results improve oscillation criteria recently discovered by Erbe, Kong and Ruan by using a generalized Riccati transformation V (t) = a(t){Y ′(t)Y −1(t) + f(t)I}, where I is the n × n identity matrix, ...
BACKGROUND Lipoprotein(a) [Lp(a)] is a known risk factor for cardiovascular disease, yet its influence on metabolic syndrome (MS) is still controversial. The purpose of this study was to assess the impact generated by this diagnosis in serum Lp(a) concentrations. MATERIALS AND METHODS A total of 1807 subjects of both genders (55.3% women and 44.7% men) belonging to the Maracaibo City Metaboli...
There are at least four different existing or proposed interpretive criteria for the disk diffusion susceptibility testing of ticarcillin and ticarcillin plus clavulanic acid (T/C). To assess these criteria, 570 gram-negative bacillary isolates were tested for susceptibility to ticarcillin and T/C by both disk diffusion and broth microdilution methods. These included 53 strains of the family En...
The explicit criteria, collected in Tables 5.1 and 5.2, for several types of ergodicity of onedimensional diffusions or birth-death processes have been found out recently in a surprisingly short period. One of the criteria is for exponential ergodicity of birth-death processes. This problem has been opened for a long time in the study of Markov chains. The survey article explains in details the...
In this paper, effective oscillation criteria for third-order delay differential equations of the form, r2r1y???(t)+q(t)y(?(t))=0 ensuring that any nonoscillatory solution tends to zero asymptotically, are established. The results become sharp when applied a Euler-type equation and, best our knowledge, improve all existing from literature. Examples provided illustrate importance main results.
Yuzhen Bai and Lihua Liu School of Mathematical Sciences, Qufu Normal University, Qufu 273165, China Correspondence should be addressed to Yuzhen Bai, [email protected] Received 10 January 2010; Accepted 17 June 2010 Academic Editor: Binggen Zhang Copyright q 2010 Y. Bai and L. Liu. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestrict...
By means of the averaging technique and the generalized Riccati transformation technique, we establish some oscillation criteria for the second-order quasilinear neutral delay dynamic equations r t |xΔ t |γ−1xΔ t Δ q1 t |y δ1 t |α−1y δ1 t q2 t |y δ2 t |β−1y δ2 t 0, t ∈ t0,∞ T, where x t y t p t y τ t , and the time scale interval is t0,∞ T : t0,∞ ∩ T. Our results in this paper not only extend t...
We use Lyapunov functionals to obtain sufficient conditions that guarantee exponential stability of the zero solution of the delay difference equation x(t + 1) = a(t)x(t) + b(t)x(t− h). The highlight of the paper is the relaxing of the condition |a(t)| < 1. An instability criteria for the zero solution is obtained. Moreover, we will provide an example, in which we show that our theorems provide...
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