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排序方式: 共有123条查询结果,搜索用时 1 毫秒
61.
Camilo Zúñiga Maria Soledad LarrechiGerard Lligadas Juan Carlos RondaMarina Galià Virginia Cádiz 《Polymer Degradation and Stability》2013
Flame retardant polybenzoxazine foams were prepared in a two step process, by heating mixtures of the benzoxazine derived from renewable diphenolic acid (DPA-Bz) with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) or 9,10-dihydro-9-oxa-10-(1-hydroxy-1-methylethyl) phosphaphenanthrene-10-oxide (DOPO-2Me) as additives. In the first step partial curing was achieved at different times and temperatures. In the second step, these materials underwent self foaming when heated at 220 °C. By means of a factorial design 23 the effect of curing conditions and type of additive on the foam density were evaluated. DOPO-2Me additive was found to partially react with the DPA-Bz leading to a decrease in the glass transition temperature of the materials. The cellular structure of the foams was characterized by scanning electron microscope in terms of cell size, cell size distribution, closed-cell content and anisotropy ratio. The presence of DOPO-2Me into the solid precursors and foams greatly influenced the thermal degradation and the flame retardancy properties as evaluated by TGA, LOI and UL-94 respectively. 相似文献
62.
Fernanda Peres FerreiraEduardo Henck Marturano Carlos Alexandre CarolloDionéia Camilo Rodrigues de Oliveira 《Tetrahedron letters》2011,52(2):297-299
A novel labdane diterpene was isolated from the plant Acritopappus longifolius. The structure of this compound was established by 1D- and 2D-nuclear magnetic resonance spectroscopic techniques and mass spectrometry data. N-Methyl-4-hydroxy-trans-proline, stigmasterol-3-O-β-d-glycoside, and the flavonoids quercetin, luteolin, kaempferol, and rutin were also isolated. 相似文献
63.
64.
Russany Silva da Costa Camilo Barroso Teixeira Taís Vanessa Gabbay Alves Roseane M. Ribeiro-Costa Alessandro A. Casazza Bahar Aliakbarian 《Natural product research》2019,33(18):2600-2608
Cupuassu (Theobroma grandiflorum Schum.) is a popular Amazonian fruit because of its intense aroma and nutritional value, whose lipid fraction is alternatively used in cosmetics. To preserve active principles and ensure their controlled release, extract was microencapsulated by spray drying. Influence of spray-drying conditions on microencapsulation of cupuassu seed by-product extract was investigated according to a 33-Box Behnken factorial design, selecting inlet temperature, maltodextrin concentration and feed flowrate as independent variables, and total polyphenol and flavonoid contents, antiradical power, yields of drying and microencapsulation as responses. Fitting the results by second-order equations and modelling by Response Surface Methodology allowed predicting optimum conditions. Epicatechin and glycosylated quercetin were the major microencapsulated flavonoids. Microparticles showed satisfactory antiradical power and stability at 5 °C or under simulated gastrointestinal conditions, thus they may be used to formulate new foods or pharmaceuticals. 相似文献
65.
Joaquín Peralta Camilo Valencia-Balvín 《The European Physical Journal B - Condensed Matter and Complex Systems》2017,90(9):177
In this work, we present a structural and dynamic characterisation of six different types of sulvanites Cu3 X Y 4 with X = Nb, V and Ta, and Y = S and Se. These materials have been the subject of intense study in recent times primarily as potential candidates for solar cell devices, as well as for their enhanced opto-electrical properties. Here, by means of first-principles calculations, we study the structural and dynamic behaviour of these materials at different temperatures, which is important for use of these materials in high-temperature conditions. In this work the dynamic and structural properties are studied using the Density Functional Theory technique. The simulations were performed at four different temperatures, ranging from room temperature to ~1500 K. By using first-principles molecular dynamics in the microcanonical ensemble, we are able to determine the vibrational spectra of these sulvanites. With this information we report for the first time the partial vibrational density of states of these structures at different temperatures. With these results we determine the vibrational properties of the basic building blocks of those sulvanites and their dynamic behaviour under temperature effects. We also show that the building blocks that which make up these structures, remain stable as the temperature increases. 相似文献
66.
Margarita E. Aliaga Catalina Carrasco-Pozo Camilo López-Alarcón Hernán Speisky 《Transition Metal Chemistry》2010,35(3):321-329
Cu2+ ions and reduced glutathione (GSH) swiftly interact to form the physiologically occurring Cu(I)–[GSH]2 complex. Prompted by the recently reported ability of this complex to generate superoxide radicals from molecular oxygen,
the present study addressed how the concentration of Cu2+ and GSH, the pH, and the temperature affect the formation of the Cu(I)–[GSH]2 complex and its capacity to generate superoxide radicals and hydrogen peroxide. Increasing concentrations of Cu2+ and GSH, added at a fixed molar ratio of 1:3, led to a proportionally greater production of superoxide anions, hydrogen peroxide,
and oxidized glutathione (GSSG). GSSG formation was found to closely reflect the formation of Cu(I)–[GSH]2. Biologically relevant changes in pH (e.g., from 6.8 to 7.7) and temperature (from 22 to 37 °C) did not affect the formation
of the Cu(I)–[GSH]2, as assessed by GSSG production. However, production of superoxide radicals increased as the pH values were incremented.
An opposite effect was observed regarding hydrogen peroxide production. The ability of a freshly prepared Cu(I)–[GSH]2 complex (assayed within a minute from its formation) to generate superoxide radicals was incremented by as the temperature
was increased. Such ability, however, correlated inversely with the temperature when, before assaying for superoxide, the
earlier referred preparation was incubated during 30 min in the presence of oxygen. Under the latter condition, hydrogen peroxide
linearly accumulated in time, suggesting that an increased autodismutation underlies the apparent time-dependent “aging” of
the capacity of the complex to generate superoxide. 相似文献
67.
In this work we propose an exact semidefinite relaxation for non-linear, non-convex dynamical programs under discrete constraints
in the state variables and the control variables. We outline some theoretical features of the method and workout the solutions
of a benchmark problem in cybernetics and the classical inventory problem under discrete constraints. 相似文献
68.
Gianmarco Aversano John Camilo Parra-Alvarez Benjamin J. Isaac Sean T. Smith Axel Coussement Olivier Gicquel Alessandro Parente 《Proceedings of the Combustion Institute》2019,37(4):4461-4469
For stationary power sources such as utility boilers, it is useful to dispose of parametric models able to describe their behavior in a wide range of operating conditions, to predict some Quantities of Interest (QOIs) that need to be consistent with experimental observations. The development of predictive simulation tools for large scale systems cannot rely on full-order models, as the latter would lead to prohibitive costs when coupled to sampling techniques in the model parameter space. An alternative approach consists of using a Surrogate Model (SM). As the number of QOIs is often high and many SMs need to be trained, Principal Component Analysis (PCA) can be used to encode the set of QOIs in a much smaller set of scalars, called PCA scores. A SM is then built for each PCA score rather than for each QOI. The advantage of reducing the number of variables is twofold: computational costs are reduced (less SMs need to be trained) and information is preserved (correlation among the original variables).The strategy is applied to a CFD model simulating the Alstom 15 MWth oxy-pilot Boiler Simulation Facility (BSF). In practice, experiments cannot provide full coverage of the pulverized-coal utility boiler due to both practicality and costs. Values of the model’s parameters which guarantee consistency with the experimental data of this test facility for 121 QOIs are found, by training a SM based on the combination of Kriging and PCA, using only 5 latent variables. 相似文献
69.
Vera Mara L. Palacios Camilo J. O. Daz Nieto Csar H. Palacios Noelia A. Di Carlantonio Natalia Luna Franco G. Torres Walter R. Flexer Victoria 《Journal of Solid State Electrochemistry》2022,26(9):1981-1994
Journal of Solid State Electrochemistry - It is expected that lithium sourcing from aqueous sources in the medium term will account for over half of worldwide production, since reserves in brines... 相似文献
70.
We study the control of dissociation of the hydrogen molecular ion and its isotopes exposed to two ultrashort laser pulses by solving the time-dependent Schr?dinger equation. While the first ultraviolet pulse is used to excite the electron wave packet on the dissociative 2psigma{u} state, a second time-delayed near-infrared pulse steers the electron between the nuclei. Our results show that by adjusting the time delay between the pulses and the carrier-envelope phase of the near-infrared pulse, a high degree of control over the electron localization on one of the dissociating nuclei can be achieved (in about 85% of all fragmentation events). The results demonstrate that current (sub-)femtosecond technology can provide a control over both electron excitation and localization in the fragmentation of molecules. 相似文献