CO sensing properties of novel nanostructured La2O3 microspheres

Abstract

It is shown that the quantum dynamics of spin coherent states governed by quadratic spin-like Hamiltonians, in the large spin limit, is well described in terms of evolution along classical trajectories on the two-dimensional sphere. Two non-linear effects: (a) spin squeezing and (b) spin entanglement are analysed using the Wigner function approach in the quasiclassical limit and numerically compared with the exact solution. " 2005 IOP Publishing Ltd.",,,,,,"10.1088/1464-4266/7/6/004",,,"http://hdl.handle.net/20.500.12104/40095","http://www.scopus.com/inward/record.url?eid=2-s2.0-19944409562&partnerID=40&md5=b1765b8033aaf80631d4afb4f7b6fe60",,,,,,"6",,"Journal of Optics B: Quantum and Semiclassical Optics",,"183

188",,"7",,"Scopus

WOS",,,,,,"Quasiclassical limit; Wigner functions",,,,,,"Classical evolution of quantum fluctuations in spin-like systems: Squeezing and entanglement",,"Article" "41890","123456789/35008",,"Cruz-Alcalá, L.E., Centro Universitario de los Altos, Universidad de Guadalajara, Mapelo 120, Tepatitlán, Jalisco, México. C.P. 47600, Mexico; Márquez-Padilla, J., Centro Universitario de Ciencias de la Salud, Universidad de Guadalajara, Guadalajara, Jalisco, Mexico; Guzmán-Guzmán, J.L., Unidad Médica de Alta Especialidad, Instituto Mexicano del Seguro Social, Guadalajara, Jalisco, Mexico; Del Cruz-Martín, C.E.E., Centro Universitario de los Altos, Universidad de Guadalajara, Mapelo 120, Tepatitlán, Jalisco, México. C.P. 47600, Mexico",,"Cruz-Alcala, L.E.

Marquez-Padilla, J.

Guzman-Guzman, J.L.

Del Cruz-Martin, C.E.E.",,"2012",,"Introduction: Creutzfeldt-Jakob disease is manifested by a rapidly progressive dementia, myoclonus and periodic sharp wave complexes in biphasic or triphasic EEG. It is required for definitive diagnosis a histopathological examination, where a characteristic feature is the spongiform lesions, neuronal loss, astrogliosis and prion protein deposits in brain tissue. Case report: A 60-yearold female with no relevant medical developed a rapidly progressive dementia, myoclonus, pyramidal syndrome and who is currently in akinetic mutism. Until the third EEG it was possible to demonstrate the periodic complexes of biphasic sharp waves. Several tests were used to rule-out other cases of rapidly progressive dementia. Cerebral magnetic resonance imaging (MRI) showed high signal intensities over the frontal cortex bilaterally. Conclusion: This case meets the criteria for a probable diagnosis of sporadic Creutzfeldt-Jakob disease. We discuss the clinical, electroencephalographic and MRI findings.",,,,,,,,,"http://hdl.handle.net/20.500.12104/40111","http://www.scopus.com/inward/record.url?eid=2-s2.0-84875744555&partnerID=40&md5=7b06c303e65906186f6f1788fe605ff6",,,,,,"6",,"Revista Mexicana de Neurociencia",,"314

318",,"13",,"Scopus",,,,,,"Creutzfeldt-Jakob disease; Myoclonus; Periodic sharp wave complexes biphasic; Rapidly progressive dementia",,,,,,"Clinical and electrophysiological evolution of a case of sporadic creutzfeldt-jakob disease [Evolución clínica y electroencefalogrófica de un caso de probable enfermedad de Creutzfeldt-Jakob esporádica]",,"Article" "44828","123456789/35008",,,,"Riojas, Carlos",,"2007",,"El objetivo de este ensayo es reflexionar acerca de las dimensiones del desarrollo regional en función del espacio y del cambio institucional a fines del siglo XX marcado por el desencanto de las estrategias de inspiración neoliberal tanto en México como en Europa Central. En la primera parte se aborda la posibilidad de analizar las dimensiones del desarrollo regional desde la perspectiva del neoinstitucionalismo económico. Posteriormente se presentan ciertas ventajas del instrumental metodológico propuesto para estudiar los fenómenos regionales en situaciones históricas y espaciales distintas. Se insiste sobre la importancia de prestar atención a contextos institucionales específicos. En seguida se habla respecto de la agudización del cambio institucional. Finalmente se presenta la multiplicidad de factores que entran en juego en el proceso de transformación institucional. El reconocimiento de esta multiplicidad implica en sí mismo proponer una agenda para investigaciones futuras desde una óptica comparada.",,,,,,,,"0187-5795","http://hdl.handle.net/20.500.12104/43049","http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S0187-57952007000300001&lng=es&nrm=iso&tlng=es; http://132.248.9.1:8991/F/F1I3MK9LAFN9LDFH4FL52CKVX2BI4DDF26N1MM5G6JT176NXD5-03984?func=full-set-set&set_number=036060&set_entry=000079&format=999

http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S0187-57952007000300001&lng=es&nrm=iso&tlng=es; http://132.248.9.1:8991/F/T2YHQN5JKYSPCIP3SAPK3TB1KGTDDEFCSVNH496MXCXGEJUB2B-03279?func=full-set-set&set_number=025047&set_entry=000709&format=999",,"Español",,,,"55",,"Argumentos",,,,"20",,"CLASE

PERIODICA",,,,,,,,"Geografía económica y regional",,,,"Estrategias de desarrollo regional en México y Europa Central. En busca de nuevas dimensiones institucionales en el ocaso de la era neoliberal",,"journalArticle" "41918","123456789/35008",,"Michel, C.R., Departamento de Física, CUCEI, Universidad de Guadalajara, M. García Barragán 1421Guadalajara, Jalisco, Mexico; Martínez-Preciado, A.H., Departamento de Física, CUCEI, Universidad de Guadalajara, M. García Barragán 1421Guadalajara, Jalisco, Mexico",,"Michel, C.R.

Martinez-Preciado, A.H.",,"2015",,"La2O3 has outstanding dielectric and catalytic properties; however, little is known about its gas sensing properties. In this work, nanostructured La2O3 hollow microspheres were prepared through a coprecipitation method. At room temperature, the reaction between lanthanum nitrate and formic acid produced lanthanum formate (La(HCOO)3) microspheres. An aqueous pectin solution was added to preserve the spherical shape during further calcination. Annealing La(HCOO)3 produced several crystalline phases, but single-phase hexagonal La2O3 was obtained up to 650°C. At this calcination temperature La2O3 microspheres were hollow and had diameters between 0.5 and 6 ?m. Their surface was permeable, possessing extensive nanoporosity. The effects on the surface morphology of calcination temperature and amount of lanthanum nitrate in solution were investigated. The gas sensing characterization was performed on thick films, which were prepared by depositing the as-prepared La2O3 on alumina substrates. The response to carbon monoxide was evaluated by impedance and direct current measurements. The effects of the applied frequency and operating temperature were evaluated. The results revealed a reproducible and reliable detection of CO at 400°C and 100 kHz. The gas sensing behavior corresponded to a p-type semiconductor material, differing from other rare earth oxides (Nd2O3, Gd2O3 and CeO2), in which an n-type semiconductor response was previously measured. " 2014 Elsevier B.V. All rights reserved.