Nosang Vincent Myung, the Bernard Keating Crawford endowed professor in chemical and biomolecular engineering at the University of Notre Dame, along with his team of engineers have developed a prototype of an electronic nose to tune the sensitivity to duplicate the functions of the human nose.    Because the chemical properties of gases affect the electrical properties of the sensing materials, Myung says manipulating the size and shape of nanoengineered materials make sharper, more functional...