In this paper, we study the problem of testing the conductance of a given graph in the general graph model. Given distance parameter ε and any constant σ > 0, there exists a tester whose running time isO( (1+σ)/2·logn·log ε ε·Φ2 ), where n is the number of vertices andm is the number of edges of the input graph. With probability at least 2/3, the tester accepts all graphs of conductance at leas...

A network of low-power wireless sensors for the detection of air quality pollutants (acetone, toluene, ammonia , formaldehyde, ethanol, benzene, dichloromethane, acetic acid, xylene and dimethylacetamide) is described in this paper. The network consists of several sensor nodes responsible for receiving information and wirelessly, through ZigBee protocol, sending it to a gateway connected to the...

In this paper a new active RFID system at 2.45 GHz based on the low-power system-on-chip CC2530 RF transceiver is designed and implemented. Only by using of an integrated multi-channel fast chip, both the MCU and RF operations are done which makes the RFID more reliable and reduces the complexity of the hardware and cost, vividly. This RFID system utilizes the Zig-Bee IEEE 802.15.4 standard in ...

In real word automation applications needs Wireless Sensor Networks (WSNs) for many controlling or observation activities. In Zig-bee based WSN, end node sensors collect the data continuously from its’ surroundings or objects and transfer to the sink node directly or with the help of anchor nodes (routers). Data will be accumulated from long periods at the sink node. WSN generated data has the ...

totally, 3200 and 320 young worker bees were investigated morphologically and molecularly respectively. the four important honey bee microsatellite loci, a24, a28, a29, a113, indicated a considerable level of genetic diversity among the nation’s northwest honey bee populations and, considering average number of alleles per locus (3.25-5.75) and, average expected heterozygosity (0.445-0.701) hig...

An analytical procedure for the calculation of the inductance of planar zig-zag spiral inductors is proposed. The procedure is based on the partial inductance concept and models the inductor as a series of a number of parts. The self-inductance of each individual part, which has the shape of a parallelogram, and the mutual inductance between any two parts of the inductor are determined. The ind...

OUT understanding of the fundamental physical limits of information handling has developed along a very convoluted path. Most of the initially plausible physical conjectures have turned out to be wrong. A participant’s personal view of these events is not a disciplined contribution to the history of science. I do, however, last my own mistakes along with those of others.