This paper introduces the method of making sand core,explains the influence of the head design of sand core,assembly of sand core and other factors on the dimension precision of casting.

The objective of this study was to examine the net nitrogen mineralization rate of three different types of temperate grassland soil using the resin-core technique and to evaluate the application of the resin core incubation technique in temperate grassland.

The soil net nitrogen mineralization in an Aneulolepidium Chinensis grassland was studied using the resin-core technique from July 20 to August 26, 2004.

Phase stabilization and preparation methods of zirconia;

Review on preparation method of nano-sized CeO_2 particles;

Studies and progress in preparation methods of nanometer ZnO desulfurizer used at ambient temperature;