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This paper presents a review and discussion of the directly modulated semiconductor lasers and their applications to optical communications and microwave photonics. A detailed and comprehensive demonstration of directly modulated semiconductor lasers from development history to specific techniques on measurement, analysis, and packaging is provided for the first time to the best of our knowledge....
In the isolated word speech recognition system, the extraction and matching of the characteristic parameters is the key link. This paper introduces a new feature parameter extracting methods on basis of Pulse Coupled Neural Network (PCNN) for the recognition system. By means of the visibility of speech spectrogram, the PCNN is used to extract the time series and entropy series from the spectrogram...
To investigate the equivalence of thermal transmission between dielectric loss calculation and molecular dynamics simulation of water system under microwave heating, several computations have been performed. By introducing a compressive factor for the thermal conductivity, the temperature profiles obtained from the dielectric loss algorithm show good agreement with that of molecular dynamics simulation...
In this paper, a 30GHz horn antenna with different feeding structures is discussed based on low temperature co-fired ceramic (LTCC) technology. The antenna with high gain is first designed by analyzing operation mechanisms of horn antennas and its implementation on LTCC structures. Then, radiation patterns are studied under stripline and microstrip feedings. The achieved fractional bandwidth is from...
In this paper, we performed a series of molecular dynamics simulations to study the temperature characteristics of heating NaCl solution at different concentrations by using different electric field intensity of microwave. By fitting the obtained data, we have established an empirical formula of temperature rise, which can simulate the temperature characteristic of heating NaCl solution under a microwave...
This paper reports the design, simulation, and analysis of a new kind of superconducting loop working as a flux-to-field transformer that is based on the superconducting magnetic flux change theory and the characteristics of ultrasensitive GMI/superconducting mixed sensors. The theoretical derivation of the transformer's expected properties is introduced and the design and fabrication of the mixed...
With its characteristics of fast, portable and friendly interaction interface, Mobile GIS for spatial data collection has become an important development trend of GIS as well as a major method for GIS data collection. However, it is not difficult to find that not only the online but also the off-line Mobile GIS data collection must collaborate with the desktop environment. For the different performance...
Numerical simulation and experiment were combined to study a self-making small-scale fluidized bed reactor. Different fluidized velocities were selected to examine its uniformity; different packing heights were set to examine the influence of critical fluidized velocity on particles; different particles were filled to test its fluidized property, and then to select the best inert support; different...
The paper deals with the control of the multiple armature-winding hybrid-excitation generator (MAHEG) which is used for wind generation. Thus, a rectifier is required between the generator and DC bus. A diode rectifier is preferred here due to its great reliability and because it is also a low-cost solution. Discontinuous PWM have gained special attention for their reduced switching losses. According...
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