Separation techniques and principles that were used by early gold prospectors are still used today in the mining industry. Some of these methods, transferred to the recycling industry, have ...

Density gradient ultracentrifugation (DGUC), as an effective method for the purification of nanomaterials, has attracted tremendou attentions of researchers. A recent review was reported by Science ...

The U.S. steel industry produces about 100 million tons annually. In 1994, this constituted 12.6 percent of world production. In addition, the United States imports about 25 million tons of steel each ...