An Analysis and Design of the Preparation Orbit for the Lunar Satellite

On the basis of the moon as regular sphere approximately, establish fixed coordinate system of the moon, In the condition of the least energy consumption, collecting information furthest, landing on the landing point precisely and so on, found the astronomy model which is based on geometric area. Meanwhile, combined with the direction and cycle of the moon's Autobiography, as well as the formula of universal gravitation etc, analyze and design the preparation orbit, then work out the related parameters.

Synthesis and Microstructure Study of Polycarboxylated Superplasticizer with Different Carboxylic Group Content

Polycarboxylate-type superplasticizers (PCs) with different carboxylic group content and the same degree of polymerization are synthesized. Their microstructures are studied by fluorescent probe technique, dynamic light scattering (DLS) and transmission electron microscopy (TEM). The method of fluorescence probe confirms that there is the formation of hydrophobic microenvironment in PC solution, and PC with low carboxylic group content produces a stronger hydrophobic microenvironment than PC with high carboxylic group content. The DLS and TEM studies find that Z-Average diameters of aggregation produced by PC with low carboxylic group content is larger than that of aggregation produced by PC with high carboxylic group content. In addition, the shape of aggregation is not regular sphere. The reason for this is that association interaction of hydrogen bonding may occur among PC molecules or in the interior of single PC molecule.