SAW RFID with enhanced penetration depth
Some methods to enhance penetration depth further are proposed and demonstrated. A second harmonics SPUDT, new criterion of matching and high reflectivity reflector are utilized to reduce the losses of SAW tag. The enhancement of reading system including high signal processing gain and compensate the center frequency mismatch between reader and SAW tag are achieved. Furthermore, the effect of decreasing working frequency to penetration capability is demonstrated. Mediums such as dry sandy, dry soil and water are compared in the experiments in order to get the achievable penetration depth. In conclusion, the practical penetration depth is superior to the ground penetrating radar with the same center frequency range.
Application of SAW RFID in the inspection management of aerodrome lights
It is increasingly urgent to improve the intelligent level of the equipment management for modern international airports. This is the first attempt of SAW RFID on aerodrome lights. SAW tag with temperature sensing function and anti-metal patch antennas are designed. The position of the tag fixed in different kinds of lights such as the runway light and the taxiway light is demonstrated. The experimental results show that SAW RFID has been successfully applied to the inspection management of aerodrome light.
ARRESTS AMONG HOMELESS AND RUNAWAY YOUTHS: THE EFFECTS OF RACE AND GENDER
ABSTRACT This study examined the contributions of race and gender to the likelihood of a first post-run arrest for a more serious and less serious offense in a sample of homeless and runaway youths from four Midwestern states. Event history analysis was used to test the hypothesis that race and gender would interact so that the likelihood of a first post-run arrest for a more serious and less serious offense would be highest for non-white males and non-white females, respectively. Potentially confounding factors—deviant subsistence strategies, substance use, gang involvement and membership, prior arrests, age, prior physical abuse, age on own, and spending time on the street—were controlled in the analyses. The hypotheses regarding the interaction of race and gender were not supported by the data. Non-whites were more likely than whites, and males were more likely than females, to be arrested for a more serious offense, and white females were more likely than non-white females to be arrested for a less serious offense.