N-2000 is an admixture for concrete, with a low slump loss, high range water-reducing ratio and long-time retarding. The N-2000 is made up of naphthalene-sulfon
A new method for measuring nano-displacement is discussed. The resolution of shift is as far as 1 nm. The principle of quantum tunneling effects was used to des
The organic monomer- molecule with nanometer magnetic powder by means of reforming the surface of nanometer magnetic powder have been synthesized. Magnetic bead