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排序方式: 共有93条查询结果,搜索用时 62 毫秒
1.
Model compound studies were carried out to elucidate the reaction mechanisms taking place during the liquefaction of coal with the hydrogen produced from the reaction of zinc and water. In compounds of the type Ph-(CH2)n-Ph the splitting of the aliphatic bridge was easier with higher n values. Ether type compounds such as diphenylether were unreactive although the C-O bond in dibenzylether was easily cleaved. Condensed ring aromatic compounds gave low conversion with hydrogenation being facilitated by an increase in ring number. Phenolic compounds such as phenol did not react well, but the reactivity increased with increase in aromatic ring size. The cleavage of the aliphatic bridge was accelerated by the OH group, for example, in the case of 4-hydroxydiphenylmethane bond scission was about 15 times higher than that of diphenylmethane. Heterocyclic compounds were unreactive. 相似文献
2.
In this paper we present the "R&W Simulator" (version 3.0), a Java simulator of Rescorla and Wagner's prediction error model of learning. It is able to run whole experimental designs, and compute and display the associative values of elemental and compound stimuli simultaneously, as well as use extra configural cues in generating compound values; it also permits change of the US parameters across phases. The simulator produces both numerical and graphical outputs, and includes a functionality to export the results to a data processor spreadsheet. It is user-friendly, and built with a graphical interface designed to allow neuroscience researchers to input the data in their own "language". It is a cross-platform simulator, so it does not require any special equipment, operative system or support program, and does not need installation. The "R&W Simulator" (version 3.0) is available free. 相似文献
3.
Fernández ME Angeles-Chavez C Mondragón-Galicia G Rodríguez-Lugo V 《Journal of materials science. Materials in medicine》2004,15(6):735-740
Transmission electron microscopy (TEM) and molecular simulation studies of traces of chemical elements such as Mg, Si, and OH in the hydroxylapatite (CaHAP) crystal structure obtained from the sand dollar were carried out. Two different types of CaHAP crystal morphologies in the samples synthesized by the hydrothermal method used were observed. Reflections with regular intensity in the experimental electron diffraction patterns obtained from these morphologies were observed. However, when these results were compared with a simulated electron diffraction pattern (which was obtained using the crystalline structure proposed for the hydroxylapatite) some forbidden reflections in the experimental pattern were observed. Then, in order to reproduce the experimental patterns Si and Mg atoms in the crystalline lattice were introduced. These elements in the elemental chemical analysis carried out by X-ray energy dispersive spectroscopy (EDS) in the typical CaHAP morphologies were detected. The positions of these atoms in the asymmetric unit were obtained using molecular simulation and during the relaxation process, the structure did not show changes in the lattice parameters. Subsequently, the crystalline structure was reproduced and matched the electron diffraction patterns simulated resulting in the experimental electron diffraction pattern. Experimental and simulated X-ray diffraction spectra were also matched. 相似文献
4.
Rogelio?RodríguezEmail author Miriam?Estevez Susana?Vargas M.?Antonieta?Mondragón 《Materials Research Innovations》2003,7(2):80-84
The synthesis and characterization of a hybrid ceramic-polymer coating with high wearing resistance and designed to cover
wood surfaces, are reported in this work. This hybrid material provides a high wearing resistance (400% higher than a conventional
commercial product typically used to protect these surfaces); additionally it has a high UV resistance and high transparency
and gloss. The wood surfaces were previously treated either with a primer coating or with a special coupling agent, before
the hybrid coating was applied; in both cases, good adhesion with the substrate was obtained.
Electronic Publication 相似文献
5.
Alejandro?Sáenz Mavis?L.?Montero Gilberto?Mondragón Ventura?Rodríguez-Lugo Victor?M.?Casta?oEmail author 《Materials Research Innovations》2003,7(2):68-73
Silica-HAp composites have been produced with particle size ranging from several nm to few μm, through control of the pH of
the solution, which also controls morphology. A calcium ions reservoir has been made available as a Ca/EDTA soluble complex
allowing the production of HAp at low temperature and short periods of time (hours). The presence of silica seems to promote
the formation of HAp under these conditions.
Electronic Publication 相似文献
6.
Emilio Muñoz‐Sandoval Dr. Vivechana Agarwal Dr. José Escorcia‐García Daniel Ramírez‐González Maria M. Martínez‐Mondragón Dr. Eduardo Cruz‐Silva David Meneses‐Rodríguez Julio A. Rodríguez‐Manzo Humberto Terrones Prof. Mauricio Terrones Prof. 《Small (Weinheim an der Bergstrasse, Germany)》2007,3(7):1105-1105
7.
Carlos Enrique Daza Oscar A. Gamba Yesid Hernández Miguel A. Centeno Fanor Mondragón Sonia Moreno Rafael Molina 《Catalysis Letters》2011,141(7):1037-1046
Abstract
A mesoporous-type catalytic support was synthesized through the modification of a smectite with polyvinyl alcohol (PVA) and microwaves. Texture and micro-morphology of the support was determined. Several techniques were employed in order to describe the chemical environment of active species on the surface. Ni0 particle sizes were dependent on the structural site of reducible species. High stable Ni-Ce catalysts (calcined at 800 °C) were evaluated in the CO2 reforming of methane reaction at 700 °C (WHSV = 96 L g−1 h−1, without dilution gas and pre-reduction). The catalysts have presented CH4 conversions between 40 and 65%, CO2 conversion between 35 and 65% and H2/CO ratios between 0.2 and 0.4. 相似文献8.
The particle size of the primary particles is an important parameter influencing the drying behavior of droplets. In this work, the influence of particle size on the drying kinetics and grain properties was analyzed for droplets containing silica nanoparticles, microparticles, and mixtures of the two. The presence of microparticles was found to increase the drying rate and shrinkage of the droplet. The drying curves were modeled using a reaction engineering approach (REA) model. Finally, different suspensions were dried in a pilot-scale spray dryer in order to prove the influence of the particle size obtained in the levitator tests. 相似文献
9.
Germán Sierra Gallego Joël Barrault Catherine Batiot-Dupeyrat Fanor Mondragón 《Catalysis Today》2010,149(3-4):365-371
LaNiO3 type perovskite was prepared by the “self-combustion” method and was used as catalyst precursor for the methane decomposition reaction at 600 and 700 °C. CH4 conversion reaches 80% at 700 °C and 65% at 600 °C using pure CH4. The yield of CNT and H2 were 2.2 gCNT g?1 h?1 and 8.2 L g?1 h?1 at 700 °C respectively after 4 h of reaction. When the reaction is prolonged to 22 h the catalytic activity decreases but the catalyst is still active, the production of hydrogen reaches 63.5 L (STP) per gram of catalyst and the production of MWCNT was equal to 17 g per gram of catalyst.Multi-wall carbon nanotubes were characterized by X-ray diffraction (XRD), surface area (BET), transmission electron microscopy (TEM), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and Raman spectroscopy. TEM micrographs showed that MWCNT longer than 20 μm were formed with inner diameters ranging from 5 to 16 nm and outer diameters up to about 40 nm.The results obtained here clearly show that the use of the perovskite LaNiO3 as catalytic precursor is very effective for the simultaneous production of carbon nanotubes and hydrogen. 相似文献
10.
Managed care is becoming increasingly important in health care. A number of ethical questions arise in this system. This paper examines the ethical responsibilities of four players in a managed care system: i) the insurance company; ii) the patient; iii) the primary care provider; and iv) the specialist. 相似文献