Find answers to your big nature questions. Delve into stories about our research, scientists and the collections we care for. Uncover the history of life on Earth, from the smallest insects to the ...

Abstract: I welcome you to the fourth issue of the IEEE Communications Surveys and Tutorials in 2021. This issue includes 23 papers covering different aspects of communication networks. In particular, ...

ABSTRACT: In this paper, a robust sliding mode controller for the control of dc-dc buck converter is designed and analyzed. Dynamic equations describing the buck converter are derived and sliding mode ...

Students react to a newsletter about the rise of cynicism and how to cultivate optimism in the new year. By The Learning Network The Times Upshot reporter Claire Cain Miller joins us in January to ...

Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, Fukuoka 812-8581, and Department of Material Engineering, Nagaoka National College of Technology, Nagaoka ...

Chemistry Department, Spelman College, Box 238, Atlanta, Georgia 30314, Space Science Laboratory, NASA George C. Marshall Space Flight Center, Huntsville, Alabama 35812, School of Earth and ...

Create your own database apps easily in formats that serve your business best. PC only. Build business apps from templates or from scratch. With rich and intuitive design tools, Access helps you ...