Results 261 to 270 of about 181,063 (291)

Oscillation Criteria in Delay Differential Inequalities

Mathematische Nachrichten, 1990
The paper contains new sufficient conditions under which every solution x of delay differential inequalities of the forms \[ x^{(n)}(t)sgn x(t)\geq p(t)\prod^{m}_{i=1}| x(g_ i(t))|^{r_ i} \] and \[ x^{(n)}(t)sgn x(t)\geq \sum^{m}_{i=1}p_ i(t)| x(g_ i(t))|, \] is either oscillatory or \(\lim_{t\to \infty} | x^{(k)}(t)| =\infty\) \((k=0,1,...,n-1 ...
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Oscillation Criteria for Matrix Differential Equations

Canadian Journal of Mathematics, 1967
We shall be concerned at first with some properties of the solutions of the matrix differential equation1.1whereis an n × n symmetric matrix whose elements are continuous real-valued functions for 0 < x < ∞, and Y(x) = (yij(x)), Y″(x) = (y″ ij(x)) are n × n matrices.
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Oscillation Criteria for Third Order Differential Equations

SIAM Journal on Mathematical Analysis, 1976
This paper gives some sufficient conditions for \[ y''' + p(x)y' + q(x)y = 0\] to have oscillatory solutions.
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Stability Criteria for Phase-Locked Oscillators

IEEE Transactions on Microwave Theory and Techniques, 1972
Stability criteria for negative conductance oscillators or amplifiers are derived in terms of the total circuit admittance. A figure of merit for phase locking at small injected powers is derived. The influence of large injected signals is studied.
G.H.B. Hansson, K.I. Lundstrom
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Oscillation Criteria for Self‐Adjoint Linear Differential Equations

Mathematische Nachrichten, 1994
The author studies oscillatory properties of solutions of selfadjoint linear differential equations of even order and their perturbations \[ \sum^n_{k= 0} (- 1)^k (p_k(x) y^{(k)})^{(k)}+ q(x) y= 0. \] His results generalize several known criteria for this type of equations.
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Oscillation criteria for nonlinear second order equations

Annali di Matematica Pura ed Applicata, 1969
A necessary and a sufficient condition are given for oscillation of all solutions of y″+f(t, y)=0. We sequire that a(t)α(y)≤f(t, y) if y>0, and f(t, y)
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Oscillation criteria of the Popov type

IEEE Transactions on Automatic Control, 1975
Criteria of the Popov type are established for the existence of periodic motion in state space for a class of time invariant, autonomous, nonlinear feedback systems. In a restricted sense they constitute an extension of a previously obtained result [1].
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Racial and socioeconomic disparities in lung cancer screening in the United States: A systematic review

Ca-A Cancer Journal for Clinicians, 2021
Ernesto Sosa, Dan J Raz, Virginia Chih-Yi Sun   +2 more
exaly  

Oncologic emergencies and urgencies: A comprehensive review

Ca-A Cancer Journal for Clinicians, 2022
Bonnie Gould Rothberg, David E Gerber, Jason J Bischof   +2 more
exaly  

Survival outcomes used to generate version 9 American Joint Committee on Cancer staging system for anal cancer

Ca-A Cancer Journal for Clinicians, 2023
Elliot A Asare
exaly