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Electromagnetic cloak is a device which makes an object "invisible" for electromagnetic irradiation in a certain frequency range. Material parameters for the complementary medium-assisted external cylindrical cloak with arbitrary cross section are derived based on combining the concepts of complementary media and transformation optics. It can make the(More)
The present study attempts to utilize coconut shell to prepare activated carbon using agents such as steam, CO(2) and a mixture of steam-CO(2) with microwave heating. Experimental results show that the BET surface area of activated carbons irrespective of the activation agent resulted in surface area in excess of 2000 m(2)/g. The activation time using(More)
Hydrangea (Hydrangea macrophylla) is a well known Al-accumulating plant, showing a high level of aluminum (Al) tolerance and accumulation. Although the physiological mechanisms for detoxification of Al and the roles of Al in blue hydrangea sepals have been reported, the molecular mechanisms of Al tolerance and accumulation are poorly understood in(More)
The electromagnetic concentrators play an important role in the harnessing of light in solar cells or similar devices, where high field intensities are required. The material parameters for two-dimensional (2D) metamaterial-assisted electromagnetic concentrators with arbitrary geometries are derived based on transformation-optical approach. Enhancements in(More)
We have developed an electromagnetic cavity resonator based RF sensor for online determination of granular dielectric materials weight. This sensor is non-instrusive and detects the density of the granular materials using resonant peaks captured instantaneously. A laboratory prototype of the RF sensor has been constructed. The properties of the RF cavity(More)
The degradation of acetaldehyde in the gas phase over Co-MCM-41, Ce-MCM-41 and MCM-41 under dark condition was studied by time-resolved microwave sensor (TRMS). Characteristic of the microwave cavity was simulated by commercial finite element software ANSYS, and the relation between reaction time and moisture content of the catalyst powder during the(More)
A three dimensional coaxial metallic waveguide channel filled with epsiv-near-zero materials is computed using a full wave electromagnetic commercial simulator CST. Simulating predict that electromagnetic waves can be tunnelled and squeezed through the channel, and the incoming TEM wave front is replicated at the output interface, independently of the(More)
The novel porous Ag2CO3 nanorods were facilely synthesized via a one-pot aqueous solution reaction at room temperature. The crystalline phase and size distribution of the nanorods were determined by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. In addition, the porous feature of nanorods was confirmed by transmission electron(More)
Based on two inequalities, the upper and lower bounds of the cutoff wavenumber of the lowest-order TM mode of a pentagonal waveguide family are derived. By means of taking the geometric mean value, an approximate formula to calculate the cutoff wavenumber of the lowest-order TM mode of a pentagonal waveguide family is developed. It is the function of the(More)
The applications of microwave heating for carbothermic reduction and acid leaching of ilmenite were presented. The experiment results show that the time needed for ilmenite concentrate reduction by microwave heating was shortened to 50% that of the conventional heating. The time of acid leaching by microwave heating is only 60% that by conventional heating.(More)