A semi-empirical Bayesian chart to monitor Weibull percentiles

This paper develops a Bayesian control chart for the percentiles of the Weibull distribution, when both its in-control and out-of-control parameters are unknown. The Bayesian approach enhances parameter estimates for small sample sizes that occur when monitoring rare events as in high-reliability applications or genetic mutations. The chart monitors the parameters of the Weibull distribution directly, instead of transforming the data as most Weibull-based charts do in order to comply with their normality assumption. The chart uses the whole accumulated knowledge resulting from the likelihood of the current sample combined with the information given by both the initial prior knowledge and all the past samples. The chart is adapting since its control limits change (e.g. narrow) during the Phase I. An example is presented and good Average Run Length properties are demonstrated. In addition, the paper gives insights into the nature of monitoring Weibull processes by highlighting the relationship between distribution and process parameters.Comment: 21 pages, 3 figures, 5 table

Best unbiased graphical estimators of location-scale distribution parameters: application to the Pozzuoli's bradyseism earthquake data

n/

Devenir monstrue. Pèls, escames i cicatrius

Treballs Finals de Grau de Belles Arts. Facultat de Belles Arts. Universitat de Barcelona, Curs: 2022-2023, Tutor: Muñoz, Raquel[ca] Monstruositat com a resistència política al gènere imposat. El projecte parla de les identitats dissidents des dels éssers subalterns i aposta per a la reconfiguració del cos no hegemònic a través del tatuatge i de generar espais d’alteració del cos de forma no-mixta i segura. Amb una base de dibuix molt important, s’han retratat les identitats monstruoses de les persones properes per a agrair l’estima mútua i també generar una autovalidació mitjançant l’apropiació d’un terme pejoratiu com el que seria ser monstre. S’abraça el concepte per a donar valor als afectes entre dissidències com a forma d’ajuda mútua per a la supervivència com a acte reivindicatiu. Profunditza en com les identitats dissidents perillen a causa de la culpa i el càstig que han d’arrossegar històricament, que es queda plasmat en el cos. Dona valor als espais dissidents com a forma de superació d’aquest malestar. Tot queda plasmat en tres propostes artístiques. A través d’una sala mural on hi ha representats tots els éssers del meu entorn, en la seva forma més monstruosa, uns tatuatges fets a persones dissidents per acostar el cos no hegemònic als éssers subalterns, i una publicació que recopila tots els processos de creació i la vivència personal del càstig i la culpa a través de textos.[eng] Monstruosity as a form of political resistance to imposed gender. This project deals with dissident identities from a subaltern being point of view and opts for a non-hegemonic body reconfiguration towards tattooing and also to create body-alteration spaces in an non-mixed and safe way. Mainly based in a drawing technique, a portrait of monstrous identities of close people has been performed in order to acknowledge mutual esteem and also generate selfvalidation towards appropriation of a pejorative condition (as monster is usually considered). We embrace this concept in order to appraise affections between different dissidences as a form of mutual help and to achieve survival as a form or a demanding action. It s tudies deeply how dissident identities are endangered because of guilt and punishment that have been historically imposed and how these are reflected in their bodies. It evaluates dissident spaces as a way to overcome this discontent. All this is reflected in three artistic proposals. First of them is a mural hall (graffiti hall) were all beings from my environment are reflected is their most monstrous way. The second proposal are tattoos made on dissident people in order to bring closer non hegemonic bodies to subaltern beings. Third one is a publication were all creation processes and punishment and guilt personal experiences are collected in different texts

Assessment of CO2 adsorption capacity on activated carbons by a combination of batch and dynamic tests

In this work, batch and dynamic adsorption tests are coupled for an accurate evaluation of CO2 adsorption performance for three different activated carbons obtained from olives stones by chemical activation followed by physical activation with CO2 at varying times, i.e. 20, 40 and 60 h. Kinetic and thermodynamic CO2 adsorption tests from simulated flue-gas at different temperature and CO2 pressure are carried out both in batch (a manometric equipment operating with pure CO2) and dynamic (a lab-scale fixed-bed column operating with CO2/N2 mixture) conditions. The textural characterization of the activated carbon samples shows a direct dependence of both micropore and ultramicropore volume on the activation time, hence AC60 has the higher contribution. The adsorption tests conducted at 273 and 293 K showed that, when CO2 pressure is lower than 0.3 bar, the lower the activation time the higher CO2 adsorption capacity and a ranking ωeq(AC20)>ωeq(AC40)>ωeq(AC60) can be exactly defined when T= 293 K. This result can be likely ascribed to a narrower pore size distribution of the AC20 sample, whose smaller pores are more effective for CO2 capture at higher temperature and lower CO2 pressure, the latter representing operating conditions of major interest for decarbonation of a flue-gas effluent. Moreover, the experimental results obtained from dynamic tests confirm the results derived from the batch tests in terms of CO2 adsorption capacity. It is important to highlight that the adsorption of N2 on the synthesized AC samples can be considered negligible. Finally, the importance of a proper analysis of characterization data and adsorption experimental results is highlighted for a correct assessment of CO2 removal performances of activated carbons at different CO2 pressure and operating temperature

Homogenous UV/Periodate Process for the Treatment of Acid Orange 10 Polluted Water

The photoactivated periodate (UV/IO4−) process is used to investigate the degradation of acid orange 10 (AO10) dye. The photodecomposition of periodate ions produces highly reactive radicals (i.e., •OH, IO3•, and IO4•) that accelerate dye degradation. Increasing the initial concentration of periodate to 3 mM enhances the dye removal rate, but over 3 mM periodate, the degradation rate slows down. On the contrary, increasing initial dye concentrations reduces the degradation performance. pH is the most critical factor in AO10 breakdown. Salts slow down the degradation of the dye. However, UV/IO4− is more efficient in distilled water than natural water. Even at low concentrations, surfactants may affect the dye’s decomposition rate. The addition of sucrose reduced the breakdown of AO10. Although tertbutanol is a very effective •OH radical scavenger, it does not affect the dye breakdown even at the highest concentrations. Accordingly, the AO10 degradation is a non-•OH pathway route. According to retrieved data, the photoactivated periodate method eliminated 56.5 and 60.5% of the initial COD after 60 and 120 min of treatment time; therefore, it can be concluded that the UV/IO4− system may treat effluents, especially those containing textile dyes