3.2. Effect of Humidity on the Electrical Transport Properties of SWCNTsWe examined the effect of the humidity changes on the resistance of SWCNTs. Figure 8 shows the effect of humidity over the current voltage characteristics of SWCNTs placed on the free electrodes. Under a modest humidity, the adsorbed water molecules appear to compensate the hole carriers in the SWCNTs, resulting download the handbook in a increase in the resistance. When the humidity level becomes higher than 67%, the decreasing resistance is probably due to a surplus electron carrier. The possible influence of a contact resistance between electrodes and SWCNTs was recently addressed by other authors [17�C19] and ruled out Inhibitors,Modulators,Libraries because the contact resistance present in two leads contacted samples provide a comparatively low contact resistance relative to the resistance between the electrodes and the possible Schottky barriers formed at the SWCNTs-electrode interface have a negligible effect on the measurements.
Figure 8.The effect of humidity over current voltage characteristics of SWCNTs detected through the free electrodes.We have also compared the effect of humidity on the SWCNTs placed Inhibitors,Modulators,Libraries on the electrodes connected to the amplifier with the ones pl
With the development of the information society, there is higher and higher demand for communication systems. Therefore, how to transmit the information faster and better has become very important. Recently, high efficiency modulation technologies are receiving the attention by many researchers, especially Ultra Narrow Band (UNB) [1,2] communication with its outstanding transmission ability in the wireless communication field.
The concept of Inhibitors,Modulators,Libraries UNB communication, first proposed by H. R. Walker, can obtain very high data rates and high spectra efficiency, even higher than traditional channel capacity. Consequently, many researchers begin to pay more attention to this ��break�� performance, and the extension to Shannon��s channel capacity equation has been proposed [3].In wireless sensor networks [4], sensor nodes are typically powered by batteries with a limited lifetime, and even though energy-scavenging mechanisms can be adopted to recharge batteries through solar panels, piezo-electric or acoustic transducers, energy is still a limited resource and must be used judiciously, so efficient use of the sensor node battery��s energy is an important aspect of sensor networks.
Therefore, many researchers have paid attention to this problem and proposed many Inhibitors,Modulators,Libraries energy management schemes [5�C7].During the research, we found that as a kind of UNB system, the Extended Binary Phase Shift Keying (EBPSK) [8] modulation, proposed by Wu et al., has better bandwidth efficiency [9], high data rates, attractive energy efficiency [10], Entinostat and can greatly little save energy for sensor nodes. However, the research on its BER performance just remains in the simulation stage and has no detailed theoretical derivations.