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Yoo, H.Y.,Yan, S.,Ra, J.W.,Jeon, D.,Goh, B.,Kim, T.Y.,Mackeyev, Y.,Ahn, Y.Y.,Kim, H.J.,Wilson, L.J.,Alvarez, P.J.J.,Lee, Y.,Song, W.,Hong, S.W.,Kim, J.,Lee, J. Elsevier 2016 Applied catalysis. B, Environmental Vol.199 No.-
<P>This study demonstrates that tin porphyrin (SnP) loading on a silica substrate (SnP/silica) markedly accelerates the degradation of Microcystins (MCs) under visible light irradiation, despite a reduction of photosensitized singlet oxygen (O-1(2)) production. A comparative study using Rose Bengal, SnP, and C-60 aminofullerene suggested that the MC-RR decay rate was directly proportional to the photosensitizing activity for triplet state-induced oxidation, while it exhibited poor correlation to singlet oxygenation efficiency. This implies that electron transfer from MC to the triplet state of SnP (facilitated by favorable MC sorption on silica) contributes to the photosensitized MC oxidation. Experiments to examine sensitizers for the one-electron oxidation of 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) showed the superiority of SnP/silica for photo-initiated electron transfer as a possible MC oxidation route. This was corroborated by the negligible effects of reagents that quench or facilitate singlet oxygenation (e.g., azide ion, D2O) on the MC-RR degradation rate. Despite MC-RR removal below detection levels, residual toxicity (indicated by a significant decrease in protein phosphatase inhibition activity) was observed. Tandem mass spectrometric analysis suggests that this residual toxicity may be ascribed to byproducts resulting from addition of a single oxygen atom to the Adda moiety. (C) 2016 Elsevier B.V. All rights reserved.</P>
Indoor indirect solar dryer for ceramic craft industry
J. J. Flores-Prieto,K. M. Aguilar-Castro,M. E Baltazar-López,G. Alvarez,R. Castillo-Rincón,J. C. Bahena-Bustos 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.1
We report the development of a prototype indirect solar dryer for plaster molds for the ceramic craft industry. The prototype was designedconsidering the reduction of the drying time against the traditional technique, working indoors and using minimal conventionalenergy. The indoor drying chamber has a capacity for 32 plaster molds with a total weight of 425 kg. The drying rate through day andnight, drying efficiency and drying constant were of 0.54 kg-H2O/h, 0.29±0.02% and 0.0094 h-1, respectively. The solar energy suppliedto heat the air of drying was 58% and the remaining 42% was provided by the ambient air. To meet the requirements of the moisturecontent of potters 5.5 days (132 hours) was needed, resulting in a reduction of two-thirds of the traditional drying time of plaster molds(21 days). The continuous rate of drying reveals the solar dryer ability to dry reasonably rapidly under indoor conditions.
Quantum Monte Carlo study of the infinite-range Ising spin glass in a transverse field
Alvarez, J V,Ritort, Felix The Institute of Physics 1996 Journal of physics A, Mathematical and general Vol.29 No.23
<P><I>We study the zero-temperature behaviour of the infinite-ranged Ising spin glass in a transverse field. Using spin summation and Monte Carlo methods we characterize the zero-temperature quantum transition. Our results are well compatible with a value <img SRC='img1.gif' ALIGN='TOP'/> for the correlation length exponent, z=4 for the dynamical exponent and an algebraic decay <img SRC='img2.gif' ALIGN='TOP'/> for the imaginary-time correlation function. The zero-temperature Monte Carlo relaxation of the energy in the presence of the transverse field shows that the system monotonically reaches the ground-state energy due to quantum fluctuations and displays glassy effects due to the strong anisotropy in the effective Hamiltonian.</I> </P>
A model for engineering the electrical conductance at nanoscale
J.A. Leon-Gil,J. Alvarez-Quintana 한국물리학회 2015 Current Applied Physics Vol.15 No.6
With the emergence of nanoelectronics faster and denser circuits are being produced, this largely because the aggressive scaling to the nanometer range of the insulating film used as dielectric. Moreover, enhancements of the electrical conductivity of nanofiller based composites can be achieved by the incorporation of conductive nanofillers into polymer matrix. In such systems electron wave-function penetration into the dielectric is important as it leads to undesired or desired leakage currents by tunneling respectively. Therefore, a proper design of the electrical conductance in such structures becomes important in order to control accurately their performance. In this research, a model for engineering the electrical conductance of resistors at nanoscale is presented. The conductance at infinitesimal bias of nanoresistors is modeled within the framework of Landauer's tunneling which results in an exponential integral function for the total electrical conductance. Model takes the effects of azimuthal and inclination angles between nanocontacts into account, as well as the effect of the thickness of the dielectric layer. The model also unveils a U-shaped behavior of the electrical conductance as a function of the azimuthal angle between nanocontacts. As a result, a minimal electrical conductance is predicted when the azimuthal angle reaches 90˚.
Investigating the magnetic entropy change in single-phase Y2Fe17 melt-spun ribbons
J.L. S anchez Llamazares,Pablo Alvarez-Alonso,C.F. S anchez-Vald es,P.J. Ibarra-Gayt an,J.A. Blanco,Pedro Gorria 한국물리학회 2016 Current Applied Physics Vol.16 No.9
The inspection of simplified fabrication and/or processing routes in order to produce materials with attractive magnetocaloric properties is of paramount importance for the development of environmentally friendly magnetic cooling technology. In this work, we have made use of the melt-spinning technique to obtain directly single-phase Y2Fe17 polycrystalline ribbons avoiding any high-temperature annealing for phase consolidation and homogenization. The melt-spun ribbons, with hexagonal Th2Ni17-type crystal structure, exhibit a moderate maximum value of the magnetic entropy change, | DSM peak| ¼ 2.4(4.4) J kg1 K1 under an applied magnetic field change of 2(5) T. Although these values are similar to those for the bulk alloy, the DSM(T) curves are manifestly broader, thus giving rise to an expansion of the working temperature range and the enhancement of about 15% in the refrigerant capacity. We also show that the magnetic field dependence of |DSM peak| at T ¼ TC follows a H2/3 power-law.
Kinetic modeling of sorption–desorption cycles for phenol removal with a cyclodextrin polymer
Francisco J. Peñas,Ana Romo,José R. Isasi,María J. San José,Sonia Alvarez 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.75 No.-
This paper examines the long-term application of a cyclodextrin hydrogel sorbent in multiple sorption–desorption cycles. Aqueous phenol was the target pollutant, whilst methanol, ethanol and isopropanolwere chosen as eluents. The experimental results were well described by empirical models: thebreakthrough curves by a two-parameter dose–response equation, and the elution curves by a pulsepeakequation with two independent parameters. The differences in polarity of solvents producedsorbent fragmentation, particularly marked for isopropanol and considerably lower for methanol, andtherefore a progressive increase in mass-transfer coefficients. In addition, a dual approach was developedfrom the proposed breakthrough model to address the mass transport of sorbate within the packed beds. Thefirst one defines an average mass-transfer coefficient as representative for each complete sorptioncycle, whereas a time-profile of this coefficient is deduced in the second method. A sorption capacity of29.6 mg-phenol/g-sorbent was found in the working conditions.
Measurement of the top quark mass in the lepton+jets channel using the lepton transverse momentum
CDF Collaboration,Aaltonen, T.,Alvarez Gonzalez, B.,Amerio, S.,Amidei, D.,Anastassov, A.,Annovi, A.,Antos, J.,Apollinari, G.,Appel, J.A.,Apresyan, A.,Arisawa, T.,Artikov, A.,Asaadi, J.,Ashmanskas, W. North-Holland Pub. Co 2011 Physics letters: B Vol.698 No.5
This Letter reports a measurement of the top quark mass, M<SUB>top</SUB>, in data from pp@? collisions at s=1.96 TeV corresponding to 2.7 fb<SUP>-1</SUP> of integrated luminosity at the Fermilab Tevatron using the CDF II detector. Events with the lepton+jets topology are selected. An unbinned likelihood is constructed based on the dependence of the lepton transverse momentum, P<SUB>T</SUB>, on M<SUB>top</SUB>. A maximum likelihood fit to the data yields a measured mass M<SUB>top</SUB>=176.9+/-8.0<SUB>stat</SUB>+/-2.7<SUB>syst</SUB> GeV/c<SUP>2</SUP>. In this measurement, the contribution by the jet energy scale uncertainty to the systematic error is negligible. The result provides an important consistency test for other M<SUB>top</SUB> measurements where explicit use of the jet energy is made for deriving the top quark mass.