The investment project is analyzed for some heat exchangers,synthetically considerated the factors including material purchasing,equipment abrasion and the power consumption and adopted four ways which are total cost of investment,operating cost,annual calculation cost,the present operating cost and annual operating cost.

Computation and allocation of transmission cooperative investment costs;

In allusion to the specialty of function of wellhead platform in Chunxiao gas field, through comparing study between two structure type of the six-leg wellhead platform and four-leg wellhead platform, the optimum plan was selected by the analysis of the overall arrangement, construction plan and investment cost based on the feasibility of structure design.

Based on the objective function of constant heat flow and minimum investment cost, the optimal match between the two surfaces of heat exchanger has been derived by comparing the differential increments of the variables in the heat transfer equation and the investment cost equation.

In this paper, gives some important basic properties of value function under the constant coefficient investment-consumption model with transaction costs, that is provides the results such as the regularity of value function.

In the paper, under a investment-consumption model with transaction costs, some basic properties of value function are discussed.

Under the market conditions supposed in Black-Scholes model and assumption that an investment object is a European call option,in this paper an investment-consumption problem is investigated.