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The dust concentration and the complex permittivity of wet sand are utilized to study the laser attenuation in sand-dust weather. The relevance of atmospheric visibility and atmospheric humidity to the air attenuation are analyzed. Afterwards, the influence of height to dust concentration and the lase attenuation under different wavelengths are discussed. The stimulation results show that the laser...
Administration of enteral feeding is associated with a higher risk of nosocomial pneumonia. Herein, we systematically review the impact of gastric versus post-pyloric feeding on the incidence of pneumonia.We searched the MEDLINE, EMBASE, Web of Science, and CCTRD (1966 to August 2011) for studies comparing gastric and post-pyloric feeding in critically ill patients. Two reviewers reviewed the quality...
To apply IPv6 to IEEE 802.15.4-based low-power wireless personal area networks, efficient packet header compression is essential to adapt to limited bandwidth, memory and energy resources of such networks. While the existing header compression solutions are yet to be perfected, an improved header compression scheme is proposed which has the capability to better support the compression on IPv6 multicast...
Orthogonal space-time block code (OSTBC) can greatly improve transmit speed rate and mitigate the effect caused by atmospheric turbulence, furthermore it can reduce the error rate in the wireless optical communication system. In this paper, the model of the multiple input multiple output (MIMO) wireless optical communication about the Gaussian channel is proposed. And an orthogonal space-time block...
Design DDS(Direct Digital Synthesizers, DDS) based on FPGA combine the advantage of the output relatively bandwidth and frequency switching time. The design and implementation of digital frequency synthesizer by FPGA are introduced in this article, moreover, the simulated wave are presented.
The key problem of fire detection is the recognition and classification for fire flame and interference. Support vector machine (SVM) is a potential data classification tool developed from statistical theory. Aiming at the shortcomings of traditional fire detection, An image fire detection algorithm based on support vector machine is presented. The algorithm overcomes the disadvantages of neural network...
STBC (space-time block code) is a new technology, which MIMO (multiple input multiple output system) can be achieved through array antenna. The technology can set off fading effectively and increase frequency spectrum efficiency. Firstly, the theory of STBC is described in this paper. And STBC is ameliorated to adapt to optical communication. Secondly, the technique is combined with QPPM modulation...
A new fluorescent reagent, 2,4-dihydroxybenzaldehyde-isonicotinylhydrazone (DHBI), is synthesized and characterized by elemental analysis and infrared spectra (KBr disks). The fluorescent reaction of aluminium(III) with the new reagent has been studied. The fluorescent excitation and emission wavelengths of the complex are at 394 and 484 nm, respectively. The optimum pH range is 4.2–4.6; hence the...
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