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Solis, Kurt L. B.,Nam, Go-un,Hong, Yongseok CSIRO Publishing 2017 Environmental chemistry Vol.14 No.3
<P> Environmental contextWastewater contains various substances such as sulfur-containing chemicals and heavy metals including mercury ions. Several technologies have been developed to trap mercury ions; however, mercury can undergo reactions with sulfite and change to its vapour form, which easily escapes to the atmosphere. Here, we devised a model to predict the formation of vapour-phase mercury as a function of sulfite concentration, temperature and water acidity based on coal-fired power plant wastewater. AbstractThe re-emission of mercury (Hg) as a consequence of the formation and dissociation of the unstable complex HgSO3 is a problem encountered in flue gas desulfurisation treatment in coal-fired power plants. A model following a pseudo-second-order rate law for Hg2+ reduction was derived as a function of [SO32-], [H+] and temperature and fitted to experimentally obtained data to generate kinetics rate values of 0.120±0.04, 0.847±0.07, 1.35±0.4mM-1 for 40°C, 60°C and 75°C respectively. The rate of reduction of Hg2+ increases with a temperature increase but shows an inverse relationship with proton concentration. Plotting the model-fit kinetics rate constants yields ΔH=61.7±1.82 kJ mol-1, which is in good agreement with literature values for the formation of Hg0 by SO32-. The model could be used to better understand the overall Hg2+ re-emission due to SO32- happening in aquatic systems such as flue gas desulfurisation wastewaters. </P>
Solis Ana,Shimony Joshua,Shinawi Marwan,Barton Kevin T. 대한고혈압학회 2023 Clinical Hypertension Vol.29 No.-
Background: Leigh syndrome is a progressive neurodegenerative mitochondrial disorder caused by multiple genetic etiologies with multisystemic involvement that mostly affecting the central nervous system with high rate of premature mortality. Case presentation: We present a 3-year, 10 month-old female patient with Leigh syndrome complicated by renal tubular acidosis, hypertension, gross motor delay, who presented with hypertensive emergency, persistent tachycardia, insomnia and irritability. Her previous genetic workup revealed a pathogenic variant in the MT-ND5 gene designated as m.13513G > A;p.Asp393Asn with a heteroplasmy of 69%. She presented acutely with malignant hypertension requiring intensive care unit admission. Her acute evaluation revealed elevated serum and urine catecholamines, without an identifiable catecholamine-secreting tumor. After extensive evaluation for secondary causes, she was ultimately found to have progression of her disease with new infarctions in her medulla, pons, and basal ganglia as the most likely etiology of her hypertension. She was discharged home with clonidine, amlodipine and atenolol for hypertension management. This report highlights the need to recognize possible autonomic dysfunction in mitochondrial disease and illustrates the challenges for accurate and prompt diagnosis and subsequent management of the associated manifestations. This association between catecholamine induced autonomic dysfunction and Leigh syndrome has been previously reported only once with MT-ND5 mutation. Conclusions: Elevated catecholamines with malignant secondary hypertension may be unique to this specific mutation or may be a previously unrecognized feature of Leigh syndrome and other mitochondrial complex I deficient syndromes. As such, patients with Leigh syndrome who present with malignant hypertension should be treated without the need for extensive work-up for catecholamine-secreting tumors.
LA METAMORFOSIS DEL PLAN PUEBLA-PANAMA : EL PROYECTO MESOAMERICA
Daniel Villafuerte Solis Institute of Iberoamerican Studies Pusan Universit 2011 International Journal of Latin American Studies Vol.1 No.1
This article analyzes the fundamental contents and purposes of the Mesoamerica Project and its transformation from a development initiative centered on Mexico and Central America, to a geopolitical instrument that incorporates two countries that play a key strategic role for the interests of the governments of the United States, Colombia and the Dominican Republic. In the context of this project, the Colombia is seen as a hinge-state between Central America and the Andean countries, opting for a more autonomous development, and the second is called to play a key role because of its strategic location in the Caribbean, crucial to protecting the so called Third Border of the United States. This analysis highlights the security component that the Mesoamerica Project is taking on more explicitly.
Stability and Design Limits of Hysteretic Current-mode Switched-inductor Converters
Carlos J. Solis,Gabriel A. Rincon-Mora 대한전자공학회 2019 Journal of semiconductor technology and science Vol.19 No.4
Emerging wireless microsystems rely on tiny batteries and intermittent energy-harvesting sources for energy and power. To sense, process, and report numerous events across extended periods, they often idle and wake to full-power conditions. Their power supplies must therefore be compact and efficient and respond quickly to sudden wide load changes. Hysteretic current-mode switched-inductor dc–dc converters are good for this application space because they are compact, efficient, and fast. Although also widely stable, they are nevertheless subject to instabilities. This paper explains how input and output voltages and load dumps limit stability, and as a result, bandwidth and response time. Measurements of a 200-mA, 1-V, 0.18-μm CMOS hysteretic current-mode buck with 95% peak powerconversion efficiency show how increasing the loaddump step by 140 mA and decreasing the input voltage by 400 mV compromise stability.
Kurt Louis Solis,Go Un Nam,Yongseok Hong 대한환경공학회 2016 Environmental Engineering Research Vol.21 No.1
The adsorption of inorganic mercury, Hg (II), in aqueous solution has been investigated to evaluate the effectiveness of synthesized gold (Au) nanoparticle-coated silica as sorbent in comparison with activated carbon and Au-coated sand. The synthesis of the Au-coated silica was confirmed by x-ray diffraction (Bragg reflections at 38.2°, 44.4°, 64.6°, and 77.5°) and the Au loading on silica surface was 6.91±1.14 mg/g. The synthesized Au-coated silica performed an average Hg adsorption efficiency of ~96 (±2.61) % with KD value of 9.96 (±0.32) L/g. The adsorption kinetics of Hg(II) on to Au-coated silica closely follows a pseudo-second order reaction where it is found out to have an initial adsorption rate of 4.73 g/μg/min/ and overall rate constant of 4.73 × 10(-4) g/μg/min/. Au-coated silica particles are effective in removing Hg (II) in aqueous solutions due to their relatively high KD values, rapid adsorption rate, and high overall efficiency that can even decrease mercury levels below the recommended concentrations in drinking water.
Study of Salting Effect of Inorganic Salts on Nano- and Giant Polymersomes
Obed Andres Solis-Gonzalez,Christopher Chi Wai Tse,Patrick J. Smith,J. Patrick A. Fairclough 한국고분자학회 2022 Macromolecular Research Vol.30 No.9
The salting effect, of kosmotropic and chaotropic salts, on nanoscale and giant-poly(ethylene oxide)16-block-poly(butylene oxide)22 polymersomes was studied. Nanovesicles were studied by dynamic light scattering and transmission electron microscopy and their aggregates (i.e., gel-like structures) by optical microscopy. Giant polymersomes were formed using drop-on-demand inkjet printing and subsequently observed using an optical microscope. The kosmotropic salts were found to strongly influence both vesicle aggregation and giant vesicle (above 3 μm) formation at high salt concentrations (i.e., ~0.5M for nanovesicle aggregation and 0.23 M for giant polymersomes) where the salting effect dominates. Chaotropic salts have very little effect in both systems. The ionic specificity effect essentially determined the outcome of experiments since the type of anion provides different ion/water/ poly(ethylene oxide) interactions and different osmotic stress values, which can be considered the main driving forces and lead the effects observed in experiments (nanovesicle aggregate experiments and abundant giant vesicle formation experiments). The applications of the present work may be lead to better methodologies to produce gel scaffolds for biomaterials or giant unilamellar polymersomes.
폐수내 양이온 및 음이온성 중금속을 동시에 제거하는 금속유기물구조체-활성탄 혼합 흡착제 개발
커트루이스솔리스 ( Kurt Louis B. Solis ),권영환 ( Youngwhan Kwon ),김문현 ( Moonhyun Kim ),홍용석 ( Yongseok Hong ) 한국폐기물자원순환학회(구 한국폐기물학회) 2016 한국폐기물자원순환학회 추계학술발표논문집 Vol.2016 No.-
Adsorption using highly porous and highly functionalized sorbents is a straightforward removal technology currently being employed, however the range of contaminants is limited. A novel sorbent was synthesized from activated carbon and Zr-based UiO66 metal organic framework to remove both cationic and oxyanionic metals from aqueous solutions. The composite was characterized using FSEM-EDS, FT-IR, XRD, and TGA, and showed successful integration of UiO66 on the surface of activated carbon. Batch adsorption tests with ICP-OES reveal that the composite has removal efficiency >95% for Pb (II), Cu (II), Se (IV), and As (V). The hybrid material is a promising sorbent for the removal of both cationic and oxyanionic metals for wastewater purification.
배연탈황시설 폐수에서 아황산에 의한 수은의 환원: 동역학 및 화학종 모델링
커트루이스솔리스 ( Kurt Louis B. Solis ),남고운 ( Go Un Nam ),홍용석 ( Yongseok Hong ) 한국폐기물자원순환학회(구 한국폐기물학회) 2016 한국폐기물자원순환학회 추계학술발표논문집 Vol.2016 No.-
The re-emission of mercury (Hg), as a consequence of the formation and dissociation of the unstable complex HgSO<sub>3</sub>, is a problem encountered in flue gas desulphurization (FGD) treatment in coal-fired power plants. A model following a pseudo-second-order rate law for Hg<sup>2+</sup> reduction was derived as a function of [SO<sub>3</sub> <sup>2-</sup>], [H<sup>+</sup>] and temperature and fitted with experimentally obtained data to generate kinetic rate values of (0.120 ± 0.04, 0.847 ± 0.07, 1.35 ± 0.4) mM<sup>-1</sup> for 40°, 60°, and 75℃, respectively. The reduction of Hg<sup>2+</sup> increases with a temperature increase but shows an inverse relationship with proton concentration. Plotting the model-fitted kinetic rate constants yields ΔH = 61.7 ± 1.82 kJ mol<sup>-1</sup>, which is in good agreement with literature values for the formation of Hg0 by SO<sub>3</sub> <sup>2-</sup>. The model could be used to better understand the overall Hg<sup>2+</sup> re-emission by SO<sub>3</sub> <sup>2-</sup> happening in aquatic systems such as FGD wastewaters.