323,004 research outputs found
Floating films of nonamphiphilic porphyrazines at the air-water interface and Langmuir-Schaefer multilayer construction and characterisation
No full textCommentary: Cardiatis Multilayer Stent for Endovascular Treatment of Peripheral and Visceral Aneurysms : Where Do We Stand?
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Effective Lock Detectors Based on Costas Loop Output for SBPSK Mobile Communications
No full textIn this study, we address the problem of lock detection at the output of a Costas loop when robust modulations for bandwidth-constrained military communications are used. In this respect, we propose two novel detectors that share the important constant false alarm rate property with respect to the noise power. The first decision scheme is an improvement of the detector proposed in (Nan et al., 2021), whereas the second architecture is grounded on the likelihood ratio test where in place of the unknown parameters suitable estimates are used. Such estimates are obtained through an iterative strategy relying on the Expectation Maximization algorithm. Moreover, when possible, we provide exact statistical characterizations of the considered decision schemes (including the competitors) or, in the other case, suitable approximations that allow for a straightforward performance evaluation. The numerical examples are obtained by means of simulated data and in comparison with the most common lock detectors for this kind of communications. The numerical results highlight that the proposed detectors represent a viable means to manage real-time lock detection
Direct observation of morphological and spectrocopic features of chlorophyll a supramoleculr structures at the air-water interface
No full textSynthesis, Coordination Chemistry, Reactivity,and Langmuir-Shäfer Films of(2-chloro-ethoxy)Fe(III)ethyl(thioporphyrazine)
No full textSynthesis, coordination chemistry, reactivity, and Langmuir-Schaefer films of (2-chloro-ethoxy)Fe(III)ethyl(thioporphyrazine)
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