The experiment was conducted to establish the linear regression equations (protein and methionine accretion responses vs methionine intake), to determine available methionine maintenance requirement for Lohmann br.

In order to offer base data for the study of energy requirement of egg laying duck,this experiment was conducted to study the metabolic energy maintenance requirement of pockmarked duck in the ceased period of You county by metabolity and energy banance test.

This paper draws out a kind of more optimizing method in guidance control that guides the practical velocity to required velocity by controlling the practical thrust direction in accordance with ideal optimal thrust direction.

When solving required velocity,It real-timely thinks about influence of oblateness of the earth and gives the process of solving required velocity by midcourse trajectory method.

In order to improve the calculation accuracy of required velocity,and efficiently control the hit accuracy of long-range ballistic missile,the paper presented required velocity compensation calculation model that is remarkably affected by the earth eccentricity,gravity anomaly and reentry resistance.

Dummy aim calculation is needed in the close-loop guidance based on the requiring velocity,which only can be acquired by linearization the earth oblateness and reentry aerodynamic force influence.