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Summary: 10 PERVASIVE computing Published by the IEEE CS and IEEE ComSoc 1536-1268/05/$20.00 © 2005 IEEE
ENERGY HARVESTING & CONSERVATION
Battery-Free Wireless
Identification and
Sensing
C
ollections of tiny, inexpensive wire-
less sensor nodes capable of contin-
uous, detailed, and unobtrusive
measurement have attracted much
attention in the past few years.1 Pro-
totypes exist for applications such as early detec-
tion of factory equipment failure, optimization
of building energy use, habitat
monitoring, microclimate mon-
itoring, and monitoring struc-
tural integrity against earth-
quakes. Unfortunately, the very
properties that make sensor
nodes attractive for these appli-
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