This paper states the expressions of solution of some differential equations with delay.

Using theorem on contracting maps,a necessary condition about all nonoscillatory solutions of the high order multidelay differential equation tending to zero is obtained,and the corresponding result is extended.

Using fourier Series theory,We study periodic solution of a class of differential equation with wome delays in this paper,where the equation is x(t)=ax(t)+Σ_(i=1)~mc_ix(t-h_i)+f(t) Then we give some very simple and convenient sufficient conditions of existence and uniqueness of periodic solution for the differential equatio

By discussing a class of the neutral difference equation with several delay arguments, the author deduces a necessary and sufficient condition for the existence of bounded positive solutions.

In this paper, we are concerned with the oscillation for the higher order nonlinear neutral difference equations with several variable delay arguments.

The neutral difference equation with several delay argumentsΔ(x n-c nx n-τ)+mi=1(p n,ix n-σ i-q n,ix n-γ i)=0is considered.

Paper [1] only gives a sufficient condition that some equations with two retards there are periodic solution.

We study a class of scalar reaction-diffusion equations with two time lagsdefind on the unit circle.

Segmented Gamma Scanning Method for Measuring Holdup in the Spherical Container;

Holdup characteristics of liquid in a packed bed were experimentally examined for clarifying the holdup of molten materials in the lower coke zone of a blast furnace.

The influence of fluid composition and its content on pressure drop and liquid holdup in landing natural gas and condensate pipeline;