Abstract: In a method for controlling hibernation of nodes of a wireless sensor network (WSN), the nodes are classified into a number of groups, each of which monitors one location and has at least two nodes. Redundant hibernation is applied to the nodes in each group. MAC layer hibernation is further applied to each node.
Abstract: A composite material includes a body and a plurality of nano-scale probes. The body is made of a polymer. The plurality of nano-scale probes is embedded in the body. The nano-scale probes are substantially uniformly distributed in the polymer matrix. The nano-scale probes are nanowires, nano-particles or nanotubes.
Type:
Grant
Filed:
July 17, 2012
Date of Patent:
June 18, 2013
Assignees:
Tsingua University, Hon Hai Precision Industry Co., Ltd.
Abstract: An emitter includes an electrode, and a number of carbon nanotubes fixed on the electrode. The carbon nanotubes each have a first end and a second end. The first end is electrically connected to the substrate and the second end has a needle-shaped tip. Two second ends of carbon nanotubes have a larger distance therebetween than that of the first ends thereof, which is advantageous for a better screening affection. Moreover, the needle-shaped tip of the second ends of the carbon nanotube has a lower size and higher aspect ratio than the conventional carbon nanotube, which, therefore, is attributed to bear a larger emission current.
Type:
Grant
Filed:
April 2, 2009
Date of Patent:
April 16, 2013
Assignees:
Tsingua University, Hon Hai Precision Industry Co., Ltd.
Inventors:
Yang Wei, Peng Liu, Liang Liu, Shou-Shan Fan