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Toplam kayıt 49, listelenen: 31-40
A new target radar cross section based passive radar surveillance receiver positioning algorithm on real terrain maps
(Spolecnost Pro Radioelektronicke Inzenyrstvi, 2018)
Placing surveillance receivers on passive radar systems is a complex task because of the dependence on third party vendors. This paper presents an efficient and robust algorithm for positioning passive radar surveillance ...
A passive acoustic based system to locate leak hole in underwater natural gas pipelines
(Academic Press Inc Elsevier Science, 2018)
Underwater natural gas pipelines can be punctured for a variety of reasons, but the most notable are corrosion and aging. This study proposes a novel passive acoustic based system, to detect acoustic signals, locate the ...
Efficiency improvement for a DC-DC quadratic power boost converter by applying a switch turn-off lossless snubber structure based on zero voltage switching
(Kaunas Univ Technology, 2018)
So as to keep the converter in small size, high switching frequencies are normally used. As a result, in higher frequencies, switching losses seriously affect the efficiency. Current and voltage stresses on power switch ...
Widely unable dual-wavelength operation of Tm:YLF, Tm:LuAG, and Tm:YAG lasers using off-surface optic axis birefringent filters
(Optical Soc Amer, 2018)
In this work, we have demonstrated dual-wavelength continuous-wave laser operation in diode-end-pumped Tm:YLF, Tm:LuAG, and Tm:YAG lasers. A 3-mm-thick quartz birefringent filter with an optical axis 45 degrees to the ...
Peak-to-average-power-ratio (PAPR) reduction methods with wavelet transform in MIMO-OFDM
(Taylor & Francis Ltd, 2018)
This study is based on the comparison of the results with an analysis method recommended for the Peak-to-Average-Power-Ratio (PAPR) reduction methods. This is one of the most significant problems in the Multiple Input-Multiple ...
A multiple-band perfect absorber for SEIRA applications
(Elsevier Science Sa, 2018)
Recently perfect absorbers (PAs) have received significant interest due to their characteristics of complex electric permittivity (epsilon) and magnetic permeability (mu). By rationally designing these artificial structures, ...
Thermoelectric transport behaviours of n-type Mg-2 (Si,Sn,Ge) quaternary solid solutions
(Keai Publishing Ltd, 2019)
Mg2X (X=Si, Sn, and Ge) based systems have attracted widespread attention owing to their various benefits in thermoelectric applications. in particular, to date, ternary Mg2X based solid solutions have become one of the ...
Centrifugally spun silica (SiO2) nanofibers for high-temperature air filtration
(Taylor & Francis Inc, 2019)
In this study, silica-based nanofibers were produced via centrifugal spinning (C-spin) and subsequent calcination. the produced heat resistant media was challenged with NaCl nanoparticles to investigate their filtration ...
Low-cost multi-mode diode pumped Tm:YLF laser: Multi-color & Q-switching operations
(Elsevier, 2019)
In this paper, we report a low-cost multi-mode AlGaAs laser diode pumped broadly-tunable solid-state Tm:YLF laser at room-temperature operating in two different regimes: multi-color and Q-switching. A low-cost multimode ...
Effect of annealing temperature on K-shell X-ray fluorescence parameters of zinc oxide thin films prepared by the sol-gel method
(Taylor & Francis Inc, 2019)
Zinc oxide thin films were grown on a glass substrate by a sol-gel process using a spin-coating technique. the obtained thin films were annealed between 350 degrees C and 550 degrees C in 50 degrees C steps and were then ...