27 research outputs found
A DAEM Algorithm for Mixtures of Gaussian Process Functional Regressions
No full textThe mixture of Gaussian process functional regressions (mix-GPFR) is a powerful tool for curve clustering and prediction. Unfortunately, there generally exist a large number of local maximums for the Q-function of the conventional EM algorithm so that the conventional EM algorithm is often trapped in the local maximum. In order to overcome this problem, we propose a deterministic annealing EM (DAEM) algorithm for mix-GPFR in this paper. The experimental results on the simulated and electrical load datasets demonstrate that the DAEM algorithm outperforms the conventional EM algorithm on parameter estimation, curve clustering and prediction.EICPCI-S(ISTP)[email protected]
Jan Moke. Miniaturist Gent-Brugse school 1478.
No full textHet doel van deze bijdrage is aan te tonen dat Jan Moke omstreeks 1478 te Gent verbleef en behoorde tot de stadsgenoten, zoals de bekende miniaturisten: Sander Bening, Claas Spierinc, Johannes Spierinc, Gheeraert Horenbout.</jats:p
Huwelijksverrassingen in Gent en omstreken.
No full textEen volksgebruik dat een aanvang naam begin 20ste eeuw.</jats:p
Pyrolytic and Kinetic Analysis of Two Coastal Plant Species: Artemisia annua and Chenopodium glaucum
No full textThe large amount of coastal plant species available makes them ideal candidates for energy production. In this study, thermogravimetric analysis was used to evaluate the fuel properties of two coastal plant species, and the distributed activation energy model (DAEM) was employed in kinetic analysis. The major mass loss due to devolatilization started at 154 and 162 degrees C at the heating rate of 10 degrees C min(-1) for Artemisia annua and Chenopodium glaucum, respectively. The results showed that the average activation energies of Artemisia annua and Chenopodium glaucum were 169.69 and 170.48 kJ mol(-1), respectively. Furthermore, the activation energy changed while the conversion rate increased, and the frequency factor k(0) decreased greatly while the activation energy decreased. The results also indicated that the devolatilization of the two coastal plant species underwent a set of first-order reactions and could be expressed by the DAEM. Additionally, a simplified mathematical model was proposed to facilitate the prediction of devolatilization curves.The large amount of coastal plant species available makes them ideal candidates for energy production. In this study, thermogravimetric analysis was used to evaluate the fuel properties of two coastal plant species, and the distributed activation energy model (DAEM) was employed in kinetic analysis. The major mass loss due to devolatilization started at 154 and 162 degrees C at the heating rate of 10 degrees C min(-1) for Artemisia annua and Chenopodium glaucum, respectively. The results showed that the average activation energies of Artemisia annua and Chenopodium glaucum were 169.69 and 170.48 kJ mol(-1), respectively. Furthermore, the activation energy changed while the conversion rate increased, and the frequency factor k(0) decreased greatly while the activation energy decreased. The results also indicated that the devolatilization of the two coastal plant species underwent a set of first-order reactions and could be expressed by the DAEM. Additionally, a simplified mathematical model was proposed to facilitate the prediction of devolatilization curves
Pyrolysis kinetic and product analysis of different microalgal biomass by distributed activation energy model and pyrolysis-gas chromatography-mass spectrometry
No full textTo assess the energy potential of different microalgae, Chlorella sorokiniana and Monoraphidium were selected for studying the pyrolytic behavior at different heating rates with the analytical method of thermogravimetric analysis (TG), distributed activation energy model (DAEM) and pyrolysis-gas chromatography-mass spectrometry (Py-GC/MS). Results presented that Monoraphidium 3s35 showed superiority for pyrolysis at low heating rate. Calculated by DAEM, during the conversion rate range from 0.1 to 0.7, the activation energies of C sorokiniana 21 were much lower than that of Monoraphidium 3s35. Both C sorokiniana 21 and Monoraphidium 3s35 can produce certain amount (up to 20.50%) of alkane compounds, with 9-Octadecyne (C18H34) as the primary compound. Short-chain alkanes (C7-C13) with unsaturated carbon can be released in the pyrolysis at 500 degrees C for both microalgal biomass. It was also observed that the pyrolysis of C sorokiniana 21 released more alcohol compounds, while Monoraphidium 3s35 produced more saccharides. (C) 2014 Elsevier Ltd. All rights reserved
Thermogravimetric and kinetic analysis of Spirulina wastes under nitrogen and air atmospheres
No full textThe pyrolysis and combustion of Spirulina wastes were assessed by thermogravimetric analysis. The results showed that combustion has considerable difference from pyrolysis under the inert atmosphere, such as the enhancement of the decomposition at low temperature, promotion of the char residue combustion and the reduction of activation energy. Under inert atmosphere, the distributed activation energy is found to be increased from 143 to 964 kJ mol(-1) with the increase of the mass conversion rate, giving a high correlation coefficient. The results also imply that the DAEM is not suitable for evaluation of the degradation kinetics under air atmosphere. Comparatively, the activation energy obtained from established global kinetic model is correspondingly lower than that from DAEM under both inert and oxidative environments. The global kinetic model is estimated to be applicable for describing the thermal decomposition of Spirulina wastes under both inert and oxidative conditions. (C) 2013 Elsevier Ltd. All rights reserved
Het Hotel d'Hane-Steenhuyse te Gent /
No full textOverdruk uit: Handelingen der maatschappij voor Geschiedenis en Oudheidkunde te Gent. nieuwe reeks ; (1985)3
Escuela Regimiento Rancagua Diagnostico Institucional y Plan de Mejoramiento
No full textEl presente plan de mejoramiento institucional fue elaborado en razón del
diagnóstico efectuado en la unidad educativa Escuela Regimiento Rancagua.
Es importante señalar que el traspaso de sostenedor de DAEM a SLEPCH a
generado aspectos positivos y negativos, entre ellos los recursos financieros los
cuales fueron disminuidos, repercutiendo en el normal funcionamiento de la unidad
y la adecuada utilización de recursos en las diversas áreas de intervención, es por
ello que el presente plan de intervención cobra gran relevancia para optimizar los
recursos en todas las áreas que interactúan en el normal funcionamiento de esta
unidad educativa.
Finalmente cabe señalar que el diagnostico efectuado es en circunstancia de la
pandemia producto del COVID 19, el cual provocó que se debieran realizar cambios
atingentes a la realidad nacional, y por supuesto a la realidad del alumnado, donde
una de las características principales del estudiantado es que son de alta
vulnerabilidad, por lo cual la pandemia les ha afectado mucho más para poder
realizar sus procesos educativos de manera adecuada, es por ello que la
elaboración del plan de mejoramiento también fue diseñado para el trabajo que se
realizara en modalidad hibrida producto de la pandemia durante el periodo
académico 2021
