In the SIS model foundation,we derive the birth-death master equation of the computer virus to disseminate on Internet, namely SIS-BD model,use the generating function method,and obtain the infection density function along with the time distribution rule which approach more in the real process about computer virus to disseminate.

Characteristic numbers and their probability meaning of two kinds of birth and death processes;

We establish a linear birth and death process model of a population in polluted environment.

Then, by using birth and death process model, this paper compares the utilization ratio and service quality of two typical strategies, which is different in some details, in order to find the best CORBA service strategy for internet.

Firstly,the system state probability is estimated by Markov birth-death process,and then the request loss probability in stable system states is estimated by queuing theory,lastly, combining both of them,therefore the expression for the user perceived availability is established to quantitatively evaluate the sensitivity of user perceive.

The amount model of SS(subscriber station),which needs ranging,is analyzed by using birth-death process under the condition of the given number of SS,and then the steady state solution of the amount is computed.

It is proved by state transfer probability that the amount of bacterial metabolism at t moment is a birth-death process.

Using quasi birth and death chain and matrix-geometric solution method,we obtain the distribution of the number of customers in the system,the average number of the customers and the average sojourn time of a customer in the stationary state.

Using quasi birth and death chain,we obtain the distribution of the number of customers in the system and the waiting time of a customer and the loss probability in the stationary state.

A new kind of physics theory based on the instant creation annihilation doctrine is introduced,proposing that the theory perhaps is a kind of explanatory theory that could integrate special relativity and quantum theory into it.

The ultimate state model and ultimate state group model with instant creation annihilation and self reappear function are founded ,the explain of creation annihilation displacement on motion is given ,the real meanings of energy and de Broglie wave s frequency are revealed.