Sol-gel incorporation of organometallic compounds into silica: useful precursors to metallic nanostructured materials

Indexación: Web of Science; ScieloLa inclusión del MLN organometálica = HOC 6 H 4 CH 2 CN • Mo (CO) 5 (6) en sílice amorfa con los precursores TEOS gelificante y N 3 P 3 {NH [CH 2 ] 3 Si [OEt] 3 } 6 permitirse los geles (MLN) ( SiO 2 ) n . Los nanocompuestos híbridos inorgánicos-orgánicos se piroliza bajo aire a 800 º C para dar óxidos nanoestructurados metálicos y / o pirofosfatos de metal (fosfatos) incluidos en las matrices de sílice. La morfología de los nanocompuestos monolíticas exhiben una fuerte dependencia con el precursor del gel utilizado es principalmente laminar para aquellos preparados utilizando N 3 P 3 {NH [CH 2 ] 3 Si [OEt] 3 } como gelificante. Las imágenes de TEM muestran la forma y tamaño diferentes, tales como nanopartículas circulares, nanocables y aglomerados en algunos casos con tamaños de 20 nm para las nanoestructuras circulares y de diámetro aproximadamente 25 nm para los nanocables.Inclusion of the organometallic MLn = [HOC5H4N•Cp2TiCl][PF6] (1), HOC5H4N-W(CO)5 (2), HOC5H4N•Mo(CO)5 (3), [HOC6H4CH2CN•Cp2TiCl][PF6] (4), HOC6H4CH2CN•W(CO)5 (5) and HOC6H4CH2CN•Mo(CO)5 (6) into amorphous silica using the gelator precursor TEOS and N3P3{NH[CH2]3Si[OEt]3}6 afford the gels (MLn)(SiO2)n. The inorganic-organic hybrid nanocomposites were pyrolyzed under air at 800°C to give nanostructured metal oxides and/or metal pyrophosphates (phosphates) included in the silica matrices. The morphology of the monolithic nanocomposites exhibited a strong dependence on the gel precursor used being mainly laminar for those prepared using N3P3{NH[CH2]3Si[OEt]3} as gelator. TEM images show different shape and size such as circular nanoparticles, nanocables and agglomerates in some cases with sizes of 20 nm for the circular nanostructures, and diameter about 25 nm for the nanocables.http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072012000200021&nrm=is

Exploring the Role of Organizational Motivations in Cross-Sector Watershed Collaboration

Watersheds are complex, dynamic and nested ecological systems that span across multiple jurisdictions. The complexity of watershed pollution requires adaptive and responsive strategies that incorporate government intervention along with community stakeholder engagement. This study explores the motivational determinants that drive local cross-sector watershed collaboration. Cross-sector collaboration offers local watershed stakeholders a holistic approach to address community watershed issues. These collaborative partnerships involve the voluntary engagement of member organizations from different industry sectors directing resources and working together to address local watershed issues of mutual interest. This research explores the social processes and the motivations that drive organizations in different industry sectors to engage in local watershed collaboration. Drawn from the motivational and interorganizational relationships literature, a conceptual framework is created to guide the investigation of the study. A single case study research design is utilized to answer the research questions. Data sources included: (1) interviews, (2) official government and organizational web sites and various media sources, and (3) field observations and memos. A total of twenty-nine organizations participated in the study. The composition of the organizations included 10 private sector organizations, 10 public sector organizations and 9 nonprofit sector organizations. Interviews were conducted with representatives from each of the member organizations that collaborate with Lynnhaven River Now. All of the organizations in the study are located within the boundaries of the Lynnhaven River watershed. The results of the study identify ten motivational determinants that drive local cross-sector watershed collaboration. These motivational determinants include asymmetry, catalytic actors, corporate/social consciousness, efficiency, instability, legitimacy, necessity, organizational interests, reciprocity, and stability. In addition, the results of the study identify variations in the level of prevalence in the motivations of organizations from the public, private and nonprofit sectors that collaborate with LRN. Finally, the results from the study identify three types of organizational motivation orientations in local cross-sector watershed collaboration: (1) transactional, (2) philanthropic and (3) symbiotic. Empirical evidence suggests that determinants in local cross-sector watershed collaboration are likely driven by the organizational motivational orientations of an organization

Bimetallic au/ag metal superstructures from macromolecular metal complexes in solid-state

Indexación: Web of Science; Scielo.Novel bimetallic Au/Ag superstructures have been prepared from solid-state pyrolysis of the macromolecular complexes Chitosan(MLn/M'Ln)n y PSP-4-PVPx( MLn/M'Ln)n with MLn = AuCl3 and M'Ln = Ag(CF3SO3)The characterization was made from XRD (X-ray diffraction of powder), SEM and EDS analysis. Morphologies are influenced by both the nature of the polymer and the metal/polymer, molar ratio of the polymer precursor. EDS analysis suggests a core/shell Au/Ag structure for the materials. A probable mechanism of the formation of these superstructures is discussed. Although separated reports of metallic superstructures of Au or Ag have been recently described, the here reported are the first bimetallic Au/Ag. Key words: Superstructures, Macromolecular complexes, metallic Au and Ag, Pyrolysishttp://ref.scielo.org/y6jcg

Efecto del E-portafolio en la competencia matemática en los estudiantes del segundo grado de educación secundaria

El presente estudio buscó demostrar el efecto que produce el e-Portafolio en el fortalecimiento de la competencia matemática: resuelve problemas de forma, movimiento y localización en los estudiantes de segundo grado de educación secundaria de la Institución Educativa Cristo Rey de José Leonardo Ortiz, 2019. La investigación se realizó desde un enfoque metodológico cuantitativo, y diseño cuasi experimental. La población participante la conformaron 153 estudiantes de segundo grado de educación secundaria, de los cuales se seleccionaron 68 estudiantes como muestra; 34 para el grupo experimental y 34 para el grupo control. Se aplicaron 2instrumentos, un cuestionario para medir la variable competencia matemática: resuelve problemas de forma, movimiento y localización; y la escala valorativa para la variable Uso del E-portafolio. Dichos instrumentos fueron valorados por expertos, mediante el coeficiente V de Aiken cuya validez estadística alcanzado fue del 0.96 para el cuestionario y 0,99 para la escala valorativa, porcentajes considerados aptos para su aplicación. De los resultados obtenidos se concluye que existe una influencia significativa del e-portafolio en el desarrollo de la competencia matemática: resuelve problemas de forma, movimiento y localización, en los estudiantes de segundo grado de la Institución Educativa Cristo Rey del distrito de José Leonardo Ortiz

The atmospheric emissions in Spain: A regional analysis

The gas emissions to the atmosphere are one the main and more actual environmental problems in the world. The effects of greenhouse gas emissions have been studied and treated recently in the Climate Change Conference in Kyoto. In the approved Kyoto Protocol, the European Union would reduce emissions by 8%, the United States by 7%, and Japan by 6%. The data for each country are used to implement policies and to make global decisions regarding the level of emissions allowed in the future. For this reason, a study more in depth about the origin and level of emissions from a regional perspective become necessary, due to the implications on the regional development. In this paper we will provide detailed information regarding atmospheric emissions in Spanish regions. Moreover, we will show that in many cases the atmospheric emissions are not directly related to the economic situation of each region. For this reason, environmental policies should pay attention to the regional differences within a country.

Anti-Gauss cubature rules with applications to Fredholm integral equations on the square

The purpose of this paper is to develop the anti-Gauss cubature rule for approximating integrals defined on the square whose integrand function may have algebraic singularities at the boundaries. An application of such a rule to the numerical solution of second-kind Fredholm integral equations is also explored. The stability, convergence, and conditioning of the proposed Nystr\"om-type method are studied. The numerical solution of the resulting dense linear system is also investigated and several numerical tests are presented

Efecto del E-portafolio en la competencia matemática en los estudiantes del segundo grado de educación secundaria

El presente estudio buscó demostrar el efecto que produce el e-Portafolio en el fortalecimiento de la competencia matemática: resuelve problemas de forma, movimiento y localización en los estudiantes de segundo grado de educación secundaria de la Institución Educativa Cristo Rey de José Leonardo Ortiz, 2019. La investigación se realizó desde un enfoque metodológico cuantitativo, y diseño cuasi experimental. La población participante la conformaron 153 estudiantes de segundo grado de educación secundaria, de los cuales se seleccionaron 68 estudiantes como muestra; 34 para el grupo experimental y 34 para el grupo control. Se aplicaron 2instrumentos, un cuestionario para medir la variable competencia matemática: resuelve problemas de forma, movimiento y localización; y la escala valorativa para la variable Uso del E-portafolio. Dichos instrumentos fueron valorados por expertos, mediante el coeficiente V de Aiken cuya validez estadística alcanzado fue del 0.96 para el cuestionario y 0,99 para la escala valorativa, porcentajes considerados aptos para su aplicación. De los resultados obtenidos se concluye que existe una influencia significativa del e-portafolio en el desarrollo de la competencia matemática: resuelve problemas de forma, movimiento y localización, en los estudiantes de segundo grado de la Institución Educativa Cristo Rey del distrito de José Leonardo Ortiz

Studio della variazione genetica al Locus SLC11A1 in <i>Capra hircus</i>

Natural resistance to infectious diseases is linked to the efficiency of the immune response and is under genetic control. The Solute Carrier Family 11 Member A1 (SLC11A1) gene encodes an integral membrane protein regulating the activity of macrophages. The SLC11A1 protein has 12 transmembrane domains (TM1-TM12), several phosphorylation sites and three functional domains. SLC11A1 gene is associated with resistance to infectious desease. In cattle, a polymorphic GT repeat, located in 3'UTR region of SLC11A1, has been associated with natural resistance to brucellosis, the GT13 allele has been associated with resistance to brucellosis, while GT14 and GT15 have been associated with susceptibility. In this study, we investigated the exon 15 of the gene and the genetic variability of the 3'UTR microsatellite in six dairy goat breeds. A total of 427 registered pedigree goats from 41 farms on the island of Sardinia, Italy, were selected. A blood sample was taken from each goat for DNA genotyping. SSCP was used to screen for polymorphisms in exons 15 of the caprine SLC11A1 gene. Variability was due to the presence of two polymorphic microsatellites. Genotyping of the upstream (GTn) repeat at 3'UTR revealed eight alleles (GT11, G12, G14-GT19) in goats, whereas GT13 was absent. Most goats carried the GT16 allele and no allele was found to be exclusive to only one breed. This microsatellite appears to be an informative DNA marker for genetic linkage analysis in goats

Auditoria interna.Empresa Enterprises Ltda.

Dentro de la auditoria a desarrollar en la empresa ENTERPRISES LTDA, se realizara una revisión no solo a los procesos y procedimientos de la misma, sino que a su vez se realizara una evaluación en cuanto a la implementación de planes y programas de las NORMAS TÉCNICAS ISO 9001, ISO 14001 y la OSHAS 18001, en cada una de las dependencias de la empresa, ya que con estas normas se busca verificar que la empresa se encuentre en regla en aspectos como lo son: la Gestión De Calidad, Medio Ambiente y La Seguridad y Salud En Trabajo. Por otra parte se realizara un análisis de los planes de acciones correctivas que emplea la empresa, como medio de mejora de los hallazgos que se encuentren, ya que este proceso debe ser continuo, para minimizar y mitigar las posibles consecuencias laborales, ambientales, salud y normativas, si se llegara a incumplir con los parámetros establecidos por ley en cada uno de estos ítems la empresa deberá asumir las acciones correctivas por parte del estadoWithin the audit to be developed in the company ENTERPRISES LTDA, a review will be carried out not only to the processes and procedures of the same, but in turn will be carried out an evaluation regarding the implementation of plans and programs of the ISO TECHNICAL STANDARDS 9001, ISO 14001 and OSHAS 18001, in each of the dependencies of the company, since these standards seek to verify that the company is in order in aspects such as: Quality Management, Environment and Safety and Health At Work. On the other hand, an analysis of the corrective action plans used by the company will be carried out, as a means of improving the findings that are found, since this process must be continuous, to minimize and mitigate the possible labor, environmental, health and safety consequences. regulations, if it were to fail to comply with the parameters established by law in each of these items the company must take corrective actions by the stat

Clima organizacional en la satisfacción laboral y desempeño docente del DAE. Facultad de Medicina. UNMSM 2015

Analiza, explica y determina el nivel de influencia del clima organizacional en la satisfacción laboral y el desempeño del docente del Departamento Académico de Enfermería. Facultad de Medicina UNMSM. Es una investigación de tipo no experimental, teórico, básico y ex post facto, método descriptivo correlacional causal. La recolección de datos se obtiene a través de cuestionarios tipo Likert que son validados y confiables mediante juicio de expertos y pruebas estadísticas: prueba binomial y coeficiente de correlación de Pearson. Para el análisis de consistencia interna se utiliza el Alpha de crombach siendo los valores 0.80, 0.71 y 0.90 para clima organizacional, satisfacción laboral y desempeño docente respectivamente, lo cual indica que tienen buena consistencia interna. Como prueba estadística para los datos recolectados, se utiliza el modelo de análisis de regresión lineal múltiple el cual permite medir la relación de la variable X en cada una de las variables Y1 e Y2; según este modelo se obtiene que el valor p-valor= 0.000 es menor a 0.05 por lo que existe evidencia estadística para rechazar la hipótesis nula y aceptar la hipótesis de estudio , lo que indica que el clima organizacional, la satisfacción laboral y el desempeño docente están relacionados directamente es decir que a un mejor clima organizacional mejor satisfacción y desempeño docente. Los resultados muestran que existe influencia significativa entre las variables en estudio, el clima organizacional influye en un 78.4 % con la satisfacción laboral y un 96% en el desempeño docente.Tesi