Autore: Josephine A. Gonzalez

U.S.-China economic ties have expanded substantially over the past three decades. Total U.S.-China trade rose from $5 billion in 1981 to an estimated $503 billion in 2011, and is projected to reach $ …

The physical properties of a polymer are strongly dependent on the size or length of the polymer chain. As chain length is increased, melting and boiling temperatures increase quickly. Impact resista …