Current Issue : April - June Volume : 2018 Issue Number : 2 Articles : 5 Articles
To compensate radar reflectivity for attenuation effect, a new method for attenuation correction of the radar reflectivity using\narbitrary oriented microwave link (referred henceforth to as ACML) is developed and evaluated. Referring to the measurement of\narbitrary orientedmicrowave link, the ACML method optimizes the ratio of specific attenuation to specific differential phase which\nis a key parameter in attenuation correction schemes. The proposed method was evaluated using real data of a dual-polarization\nX-band radar and measurements of two microwave links during two rainstorm events. The results showed that the variation range\nof the optimized ratio was overall consistent with the results of the previous studies. After attenuation correction with the optimal\nratios, the radar reflectivity was significantly compensated, especially at long distances. The corrected reflectivity was more intense\nthan the reflectivity corrected by the ââ?¬Å?self-consistentââ?¬Â (SC) method and closer to the reflectivity of a nearby S-band radar. The\neffectiveness of the method was also verified by comparing the rain rates estimated by the X-band radar with those derived by rain\ngauges. It is demonstrated that arbitrary oriented microwave link can be adopted to optimize the attenuation correction of radar\nreflectivity....
Work presented herein is the first report of two dual-action hybrids synthesized by covalent linkage of carbazole based novel\nantibacterial compounds with efflux pump inhibitors, that is, indole acetic acid/gallic acid. In this paper, novel antibacterial\ncompounds 2 and 3 were prepared first and then these were covalently linked with efflux pump inhibitors, that is, indole acetic\nacid/gallic acid leading to the successful formation of two dual-action hybrids 4 and 5. Prepared antibacterials and hybrids were\nevaluated for their bacteria cell killing capability against Escherichia coli, Staphylococcus aureus, Pasteurella multocida, and Bacillus\nsubtilis. Both antibacterial compounds 2 and 3 were found effective against all tested bacterial strains at different concentrations.\nBut when these compounds were linked with efflux pump inhibitors, they showed dramatic enhancement in their bacterial cell\nkilling potential and minimum inhibitory concentration of all hybrids ranging from 7.250 ...
Microwave thermal ablation is a cancer treatment that exploits local heating caused by a microwave electromagnetic field to induce\ncoagulative necrosis of tumor cells. Recently, such a technique has significantly progressed in the clinical practice. However, its\neffectivenesswould dramatically improve if paired with a noninvasive systemfor the real-timemonitoring of the evolving dimension\nand shape of the thermally ablated area. In this respect, microwave imaging can be a potential candidate to monitor the overall\ntreatment evolution in a noninvasive way, as it takes direct advantage from the dependence of the electromagnetic properties of\nbiological tissues from temperature. This paper explores such a possibility by presenting a proof of concept validation based on\naccurate simulated imaging experiments, run with respect to a scenario that mimics an ex vivo experimental setup. In particular,\ntwo model-based inversion algorithms are exploited to tackle the imaging task. These methods provide independent results in realtime\nand their integration improves the quality of the overall tracking of the variations occurring in the target and surrounding\nregions....
Microwave treatment can reduce the time of selected syntheses, for instance of gold\nnanoparticles (AuNPs), from several hours to a few minutes. We propose a microfluidic structure for\nenhancing the rate of chemical reactions using microwave energy. This reactor is designed to control\nmicrowave energy with much higher accuracy than in standard devices. Thanks to this, the influence\nof microwave irradiation on the rate of chemical reactions can be investigated. The reactor consists of a\ntransmission line surrounded by ground metallization. In order to deliver microwave energy to the\nfluid under test efficiently, matching networks are used and optimized by means of numerical methods.\nThe monolithic device is fabricated in the low temperature co-fired ceramics (LTCC) technology.\nThis material exhibits excellent microwave performance and is resistant to many chemical substances as\nwell as high temperatures. Fabrication of the devices is described in detail. Measurements of microwave\nparameters are performed and differences between simulation and experiment results are discussed.\nFinally, the usefulness of the proposed device is proved in exemplary synthesis...
A fast and efficient microwave tomographic algorithm is proposed for 2-D and 3-D real-time intrawall imaging. The exploding\nreflection model is utilized to simplify the imaging formulation, and the half-space Green�s function is expanded in the spectral\ndomain to facilitate the easy implementation of the imaging algorithm with the fast Fourier transform (FFT) and inverse fast\nFourier transform (IFFT). The linearization of the inversion scheme and employment of FFT/IFFT in the imaging formula\nmake the algorithm suitable for various applications pertaining to the inspection of a large probed region and allow real-time\nprocessing. Representative numerical and experimental results are presented to show the effectiveness and efficiency of the\nproposed algorithm for real-time intrawall characterization...
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