国家自然科学基金项目61365011;陇原青年创新性人才扶持计划项目;甘肃省高校基本科研业务费专项项目;兰州理工大学红柳杰出人才培养计划项目J201201资助;Supported by National Natural Science Foundation of China(No.61365011);Young Creative Talent Support Program of Long Yuan of China;Specialized Basic Scientific Research Program of University of Gansu Province;Hong Liu Outstanding Talent Training Plan of Lanzhou University of Technology(No.J201201)