room temperature liquefied petroleum gas (lpg) sensor based on p-polyaniline n-tio2 heterojunction

... of the gas sensor based on 2% Fe 2 O 3 –ZnO nanoparticle. 3.5. Reproducibility of gas sensor based on 2% Fe 2 O 3 –ZnO nanoparticles Fig. 7 shows the reproducibility of the sensor based on 2% Fe 2 O 3 –ZnO ... the gas sensing properties of the ZnO nanosensors, and the composition of Fe:Zn = 2% is the best for the Fe 2 O 3 –ZnO nanocomposite thin film gas sensors. 5. C...

Ngày tải lên: 19/03/2014, 16:47

... evolution of the electrical signal when Fig. 6. Sensor s electrical responses to various ammonia concentrations (a). Slope of the gas sensor s electrical response vs. NH 3 concentrations (b). 204 ... sen- sitive layer temperature decreases the sensitivity of the gas sensor. The best sensitivity was obtained at room temperature. Conse- quently, in term of power consumption, the PP...

Ngày tải lên: 19/03/2014, 16:47

... Protons are supposedly intercalated to form a tungsten bronze. An injected electron reduces a W 6þ ion to a W 5þ ion, and the polaron transition between a W 5þ ion and nearby a W 6þ ion is responsible ... reduction/oxidation of WO 3 . The basic concept is the formation of tungsten bronze with the intercalation of hydrogen ions. But the oxygen removal by hydrogen reduc- tion and water formatio...

Ngày tải lên: 19/03/2014, 16:47

... property of a gas sensor mainly depends upon the response time at low gas concentrations. The room- temperature response and recovery time of the LSCO nanotube sensor at low NH 3 concentrations are ... capacitance varied with the NH 3 concentration monotonically but nonlinearly, while the dielectric loss was non- monotonically related to the NH 3 concentration. When the NH 3 Fig. 6...

Ngày tải lên: 20/03/2014, 13:04

... navigation method in an unknown environment is based on the combination of two types of obstacle avoidance behaviors, one for the convex obstacles and one for the concave ones. In the case of convex ... unknown environment. They could be called reactive strategies and are completely based on sensory information. Therefore, an absolute localization is not requisite and only the relativ...

Ngày tải lên: 23/10/2013, 15:15

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Ngày tải lên: 01/01/2014, 20:12

... In our current implementation, however, it just gives up. 4.2 Motion Coordination Objects in the environment are not always opponent to the vehicle. In our second application one object is accepted ... formulation of the n-camera stereo corre- spondence problem. In Proceedings of the International Conference on Computer Vision, Bombai, Jan. 1998. 14. K. Sobottka and H. Bunke. Vision -based...

Ngày tải lên: 20/01/2014, 01:21

... push direction to have a positive component in the direction opposing the belt motion. We now transform this constraint on the push direction relative to the belt into a constraint on successive ... orientations except for the desired one. In this section, we consider the use of traps to filter polygonal parts on a track. A trap is a (partial) interruption of the track. We focus on pol...

Ngày tải lên: 20/01/2014, 01:21

... Gaussian concentration profile produced by ion-implantation. It is there- fore of interest to compare the PL emission from samples implanted in a conventional manner with that from samples containing ... Photoluminescence; Ion-implantation; Light emission; Photonics 1. Introduction The optical properties of Si nanocrystals in SiO  have been studied extensively since visible room temperatur...

Ngày tải lên: 16/03/2014, 15:26