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Antolin Jesila Jesu Amalraj,Umesh Narasimha Murthy,Sea-Fue Wang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.108 No.-
Herein, we have fabricated silver (Ag) over selenium (Se) to explore its enriched electrochemical performancetowards the simultaneous detection of nitro-aromatic drugs (nitrofurantoin (NFT) and Pnitrophenol(P-NP)). Due to its synergistic effect, Ag/Se modified GCE showed excellent electrocatalyticactivity compared to other electrodes. Well-defined and divergent reduction peaks wereobtained at 0.49 V (NFT) and 0.85 V (P-NP) with a detection range of 0.9 V at Ag/Se/GCE. It withholdsan extensive linear range of 0.1 to 210 mM for NFT and 0.1 to 150 mM for P-NP with a nanomolar leveldetection limit of 23.87 nM L1 & 7.82 nM L1; an appraisable sensitivity of 1.138 mA mM1 cm2 &2.86 mA mM1 cm2 for NFT and P-NP, respectively. Interestingly, the electrode possesses a high selectivityin the presence of biomolecules, nitro drugs, and metal ions. Examination of nitro-aromatic drug contaminationon water sources shows a massive peril to human life and marine environs due to its adverse hazardouseffects. Further, the fabricated Ag/Se-based electrochemical sensor was exposed to variousenvironmental aqueous samples to detect NFT& P-NP which has demonstrated an exquisite recoveryresults in practical feasibility. Thereby confirms that Ag/Se-based electrochemical sensors have boundlesspotential for ecological investigations and sensing applications.
Antolin Jesila Jesu Amalraj,Umesh N.,Sea-Fue Wang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.106 No.-
In this work, platinum nanoparticles (Pt) decorated on a spinel group, zinc cobalt oxide (ZnCo2O4) 3-Dflower was intended to detect caffeine electrochemical sensor. Pt particles were used to enhance the performanceof hydrothermally prepared 3-D ZnCo2O4 flower. So Pt nanoparticles were decorated on eachthin nanosheet of self-assembled 3-D flower-like ZnCo2O4. The thin transparent nanosheet of theZnCo2O4 flower will benefit electrochemical sensors by simplifying its ion exchange. Therefore,Pt@ZnCo2O4 shows an excellent electrochemical conductivity, which promotes the caffeine-based sensor’srapid electrochemical oxidation. Using amperometric i-t at an applied potential of 1.45 V,Pt@ZnCo2O4 modified electrode shows widespread of two linear ranges (0.05 to 265.55 lM and 295.55to 757.55 lM) with a low detection limit (0.0114 and 0.01657 lM) and high sensitivity (3.419 and1.862 lA lM1 cm2). Moreover, good results were obtained for the real-time detection of caffeine insugar-free cola beverage and energy drink samples. Henceforth, the developed method could be an idealway to detect caffeine in real samples.
Antolin Jesila Jesu Amalraj,Sea-Fue Wang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.111 No.-
Importance in the precise determination of Furazolidone (FZD) on biological, food, and water sampleswere established for regulating health and nutrition, diagnosis/treatment, pharmacological research,and food/drug quality monitoring. Thus, the sensitive and accurate determination of FZD is necessary. Here, we construct facile and low-cost Metal Titanate (MTiOx, M = Mn, Fe, Cu) as an electrode modifiervia a different one-step synthesis method. By the virtue of unique properties, MnTiO3 has been successfullyemployed in the electrochemical evaluation of FZD such as high active surface area (0.1252 cm2) andhigh electron transfer kinetics with low charge transfer resistance (Rct = 374.65 X) with good electrocatalytickinetic parameters. In this regard, MnTiO3 is employed in the electrochemical evaluation ofFZD through cyclic voltammetry (CV) and Differential Pulse Voltammetry (DPV) techniques. The proposedMnTiO3/GCE sensor shows exquisite electrochemical characteristics including a wide linear range(0.05 to 1101.6 lM), nanomolar detection limit (4.05 nM), and encouraging sensitivity (68.77 lA lM1cm2). Moreover, it also exemplifies exquisite selectivity, repeatability, reproducibility, and storage stabilitytherefore; MnTiO3 is employed in the practical feasibility analysis in various real samples, whichshows excellent recovery results.
Lock-in and drag amplification effects in slender line-like structures through CFD
Belver, Ali Vasallo,Iban, Antolin Lorenzana,Rossi, Riccardo Techno-Press 2012 Wind and Structures, An International Journal (WAS Vol.15 No.3
Lock-in and drag amplification phenomena are studied for a flexible cantilever using a simplified fluid-structure interaction approach. Instead of solving the 3D domain, a simplified setup is devised, in which 2D flow problems are solved on a number of planes parallel to the wind direction and transversal to the structure. On such planes, the incompressible Navier-Stokes equations are solved to estimate the fluid action at different positions of the line-like structure. The fluid flow on each plane is coupled with the structural deformation at the corresponding position, affecting the dynamic behaviour of the system. An Arbitrary Lagrangian-Eulerian (ALE) approach is used to take in account the deformation of the domain, and a fractional-step scheme is used to solve the fluid field. The stabilization of incompressibility and convection is achieved through orthogonal quasi-static subscales, an approach that is believed to provide a first step towards turbulence modelling. In order to model the structural problem, a special one-dimensional element for thin walled cross-section beam is implemented. The standard second-order Bossak method is used for the time integration of the structural problem.
Ad-hoc vibration monitoring system for a stress-ribbon footbridge: from design to operation
Norberto Iban,Jose M. Soria,Alvaro Magdaleno,Carlos Casado,Ivan M. Diaz,Antolin Lorenzana 국제구조공학회 2018 Smart Structures and Systems, An International Jou Vol.22 No.1
Pedro Gómez Bosque footbridge is a slender and lightweight structure that creates a pedestrian link over the Pisuerga River, Valladolid, Spain. This footbridge is a singular stress ribbon structure with one span of 85 m consisting on a steel plate and precast concrete slabs laying on it. Rubber pavement and a railing made of stainless steel and glass complete the footbridge. Because of its lively dynamics, prone to oscillate, a simple and affordable structural health monitoring system was installed in order to continuously evaluate its structural serviceability and to estimate its modal parameters. Once certain problems (conditioning and 3D orientation of the triaxial accelerometers) are overcome, the monitoring system is validated by comparison with a general purpose laboratory portable analyzer. Representative data is presented, including acceleration magnitudes and modal estimates. The evolution of these parameters has been analysed over one-year time.
Lazze, Maria Claudia,Pizzala, Roberto,Pecharroman, Francisco Javier Gutierrez,Garnica, Paloma Gaton,Rodriguez, Juan Manuel Antolin,Fabris, Nicola,Bianchi, Livia The Korean Society of Food Science and Nutrition 2009 Journal of medicinal food Vol.12 No.3
Grape waste management is one of the main problems of winery industries, but, conversely, grape waste contains a high amount of polyphenols that might protect against human diseases related to oxidative stress, such as colorectal cancer. Therefore, the aim of this work was to investigate the antioxidant and antiproliferative activities of a grape waste extract obtained by supercritical fluid extraction. Because the beneficial effect of grape is related to its content of polyphenolic molecules, the extract was chemically characterized by high-performance liquid chromatography in order to assess its major bioactive components. The antioxidant activity of the grape extract was determined. The results showed that the grape extract presents a strong antiradical activity in the in vitro 2,2-diphenyl-1-picrylhydrazyl radical assay and protects against reactive oxygen species production in human colon adenocarcinoma cells (Caco-2). In contrast, the extract did not protect in the citronellal thermooxidation system and showed a weak protective action against lipid peroxidation in Caco-2 cells. The clonogenic assay and the cell cycle distribution analysis showed that the grape extract has a significant antiproliferative effect in a tumor cell line. These data indicate that grape extract is a promising product to be used as an anti-free radical agent and could exert a chemopreventive action.
Ad-hoc vibration monitoring system for a stress-ribbon footbridge: from design to operation
Iban, Norberto,Soria, Jose M.,Magdaleno, Alvaro,Casado, Carlos,Diaz, Ivan M.,Lorenzana, Antolin Techno-Press 2018 Smart Structures and Systems, An International Jou Vol.22 No.1
Pedro $G{\acute{o}}mez$ Bosque footbridge is a slender and lightweight structure that creates a pedestrian link over the Pisuerga River, Valladolid, Spain. This footbridge is a singular stress ribbon structure with one span of 85 m consisting on a steel plate and precast concrete slabs laying on it. Rubber pavement and a railing made of stainless steel and glass complete the footbridge. Because of its lively dynamics, prone to oscillate, a simple and affordable structural health monitoring system was installed in order to continuously evaluate its structural serviceability and to estimate its modal parameters. Once certain problems (conditioning and 3D orientation of the triaxial accelerometers) are overcome, the monitoring system is validated by comparison with a general purpose laboratory portable analyzer. Representative data is presented, including acceleration magnitudes and modal estimates. The evolution of these parameters has been analysed over one-year time.
Solar Science with the Atacama Large Millimeter/Submillimeter Array-A New View of Our Sun
Wedemeyer, S.,Bastian, T.,Brajš,a, R.,Hudson, H.,Fleishman, G.,Loukitcheva, M.,Fleck, B.,Kontar, E. P.,De Pontieu, B.,Yagoubov, P.,Tiwari, S. K.,Soler, R.,Black, J. H.,Antolin, P.,Scullion, E.,Gu Springer-Verlag 2016 Space science reviews Vol.200 No.1
<P>The Atacama Large Millimeter/submillimeter Array (ALMA) is a new powerful tool for observing the Sun at high spatial, temporal, and spectral resolution. These capabilities can address a broad range of fundamental scientific questions in solar physics. The radiation observed by ALMA originates mostly from the chromosphere-a complex and dynamic region between the photosphere and corona, which plays a crucial role in the transport of energy and matter and, ultimately, the heating of the outer layers of the solar atmosphere. Based on first solar test observations, strategies for regular solar campaigns are currently being developed. State-of-the-art numerical simulations of the solar atmosphere and modeling of instrumental effects can help constrain and optimize future observing modes for ALMA. Here we present a short technical description of ALMA and an overview of past efforts and future possibilities for solar observations at submillimeter and millimeter wavelengths. In addition, selected numerical simulations and observations at other wavelengths demonstrate ALMA's scientific potential for studying the Sun for a large range of science cases.</P>