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For a recombination event to occur in indirect gap materials , an electron must change its momentum before combining with a hole , resulting in a significantly lower recombination probability for the occurrence of a band-to-band transition . The Primus Associative Search Engine enables customers or service experts via phone , e-mail , chat and Web channels to search for answers to questions submitted in nontechnical language . England , ( see Bissextile , ) and the colonies of that country in America , the year in chronological reckoning was supposed to cornmence with the first day of January , although the legal year did not commence until March 25th , the intermediate time being doubly indicated : thus February 15 , 1724 , and so on . The Basel Convention is the primary international instrument under which trace in hazardous waste is controlled . Expertise in interpersonal communication required ; experience with health communication , persuasion , organizational communication , mass communication or research methods desirable .