The Experts below are selected from a list of 228 Experts worldwide ranked by ideXlab platform
Liliana Patricia Fernandez - One of the best experts on this subject based on the ideXlab platform.
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derivatized silver nanoparticles as sensor for ultra trace nitrate determination based on light Scattering Phenomenon
Talanta, 2009Co-Authors: Chien C Wang, Marta Olga Luconi, Adriana Noemi Masi, Liliana Patricia FernandezAbstract:New silver nanoparticles coated with EDTA (EDTA-AgNPs) have been synthesized by citrate reduction method and characterized by UV-vis spectroscopy, molecular fluorescence and scanning electron microscopy (SEM). The derivatized nanoparticles show fluorescent emission and second order Scattering (SOS) signals which in presence of nitrate are both attenuated. The SOS decreasing is greater than its fluorescent quenching; considering this fact, a new ultra sensitive methodology using the derivatized silver nanoparticles as sensor for nitrate determination has been developed. Under optimal established conditions, a linear response has been obtained within the range of 6.4 x 10(-4) to 3.0 microg mL(-1) nitrate concentrations, with a detection limit of 1.8 x 10(-4) microg mL(-1). This novel technique provides a sensitive and selective methodology for nitrate determination and has been satisfactorily applied to its quantification in parenteral solutions.
Heetae Jung - One of the best experts on this subject based on the ideXlab platform.
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well defined and high resolution pt nanowire arrays for a high performance hydrogen sensor by a surface Scattering Phenomenon
Analytical Chemistry, 2015Co-Authors: Hae Wook Yoo, Sooyeon Cho, Hwanjin Jeon, Heetae JungAbstract:Developing hydrogen (H2) sensors with a high sensitivity, rapid response, long-term stability, and high throughput is one of the critical issues in energy and environmental technology [Hubert et al. Sens. Actuators, B 2011, 157, 329]. To date, H2 sensors have been mainly developed using palladium (Pd) as the channel material because of its high selectivity and strong affinity to the H2 molecule [(Xu et al. Appl. Phys. Lett. 2005, 86, 203104), (Offermans et al. Appl. Phys. Lett. 2009, 94, 223110), (Yang et al. Nano Lett. 2009, 9, 2177), (Yang et al. ACS Nano 2010, 4, 5233), and (Zou et al. Chem. Commun. 2012, 48, 1033)]. Despite significant progress in this area, Pd based H2 sensors suffer from fractures on their structure due to hydrogen adsorption induced volumetric swelling during the α → β phase transition, leading to poor long-term stability and reliability [(Favier et al. Science 2001, 293, 2227), (Walter et al. Microelectron. Eng. 2002, 61–62, 555), and (Walter et al. Anal. Chem. 2002, 74, 1546)]. I...
Ilaria Catapano - One of the best experts on this subject based on the ideXlab platform.
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forward looking ground penetrating radar via a linear inverse Scattering approach
IEEE Transactions on Geoscience and Remote Sensing, 2015Co-Authors: Ilaria Catapano, Antonio Affinito, Alessio Del Moro, Giovanni Alli, Francesco SoldovieriAbstract:An inverse Scattering approach has been designed to process data gathered by means of forward-looking ground-penetrating radar systems. Such an inverse approach exploits a linear model of the Scattering Phenomenon and is able to account for the half-space 2-D geometry. In this frame, a theoretical study on the achievable reconstruction capabilities is provided with the aim to estimate the range and cross-range resolution limits and gain indications about the issue of how to design the measurement configuration. Finally, numerical and experimental examples are provided to assess the effectiveness of the approach.
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the linear sampling method as a way to quantitative inverse Scattering
IEEE Transactions on Antennas and Propagation, 2012Co-Authors: Lorenzo Crocco, Ilaria Catapano, L Di Donato, Tommaso IserniaAbstract:The linear sampling method (LSM) is a simple and effective approach to image the shape of unknown targets via the solution of a linear inverse problem. In this paper, we show that the LSM can also be exploited to devise a novel effective approximation of the Scattering Phenomenon, that leads to a new noniterative linear inversion method for the estimation of the target's electric contrast. Since the introduced approximation relies on the broad applicability of the LSM, the proposed inversion method is suitable to tackle inverse Scattering problems involving nonweak scatterers. As such, it represents an innovative, yet effective, way to tackle quantitative imaging. Examples with numerical and experimental data are given to show the performance of the approach. In particular, results obtained with Fresnel data-sets show that the proposed method is capable of successfully imaging targets which have been so far processed using nonlinear iterative schemes and taking advantage of frequency diversity.
G.v. Kovalev - One of the best experts on this subject based on the ideXlab platform.
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the resonance Scattering Phenomenon of fast negatively charged particles in a single crystal
arXiv: Mesoscale and Nanoscale Physics, 2014Co-Authors: G.v. KovalevAbstract:The energy spectrum of the extended attractive potential of a crystallographic row for negatively charged particles has quasi-bound states. It follows that a negatively charged particle with small transversal momentum component ($p_{\bot} R <<1$) may undergo resonance Scattering. Thus the resonance Scattering Phenomenon can be observed in a single crystal, when fast electrons move with a small glancing angle ($\theta_0 << 1/pR$) to a crystallographic axis. The calculated results for the electrons and angular widths of resonance peaks are consistent with experimental data.
Hae Wook Yoo - One of the best experts on this subject based on the ideXlab platform.
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well defined and high resolution pt nanowire arrays for a high performance hydrogen sensor by a surface Scattering Phenomenon
Analytical Chemistry, 2015Co-Authors: Hae Wook Yoo, Sooyeon Cho, Hwanjin Jeon, Heetae JungAbstract:Developing hydrogen (H2) sensors with a high sensitivity, rapid response, long-term stability, and high throughput is one of the critical issues in energy and environmental technology [Hubert et al. Sens. Actuators, B 2011, 157, 329]. To date, H2 sensors have been mainly developed using palladium (Pd) as the channel material because of its high selectivity and strong affinity to the H2 molecule [(Xu et al. Appl. Phys. Lett. 2005, 86, 203104), (Offermans et al. Appl. Phys. Lett. 2009, 94, 223110), (Yang et al. Nano Lett. 2009, 9, 2177), (Yang et al. ACS Nano 2010, 4, 5233), and (Zou et al. Chem. Commun. 2012, 48, 1033)]. Despite significant progress in this area, Pd based H2 sensors suffer from fractures on their structure due to hydrogen adsorption induced volumetric swelling during the α → β phase transition, leading to poor long-term stability and reliability [(Favier et al. Science 2001, 293, 2227), (Walter et al. Microelectron. Eng. 2002, 61–62, 555), and (Walter et al. Anal. Chem. 2002, 74, 1546)]. I...
