Penulis: Alan Harper

In the late 1970s and early 1980s, British blues fan Alan Harper became a transatlantic pilgrim to Chicago. "I’ve come here to listen to the blues, " he told an American customs agent at th …

The North Caucasus region has been a source of instability for the past several centuries. Underlying social, economic, and political issues of the region remain. A low-level insurgency persists in t …

Polyimide (PI) is an engineering polymer material with advantages of high temperature resistance, low temperature tolerance, radiation resistance, flexibility and excellent dielectric properties. Thi …