Search results for " REM"

Mathematical modelling of greenhouse gas emissions from membrane bioreactors: A comprehensive comparison of two mathematical models.

2018

Abstract This paper compares two mathematical models (Model I and Model II) to predict greenhouse gases emission from a University Cape Town (UCT) – membrane bioreactor (MBR) plant. Model I considers N 2 O production only during denitrification. Model II takes into account the ammonia-oxidizing bacteria (AOB) formation pathways for N 2 O. Both models were calibrated adopting real data. Model comparison was performed in terms of (i) sensitivity analysis (ii) best fit and (iii) model prediction uncertainty. On average 6% of factors of Model I and 9% of Model II resulted to be important. In terms of best fit, Model II had a better capability of reproducing the measured data. The average effici…

The effect of the solids and hydraulic retention time on moving bed membrane bioreactor performance

2018

Abstract The aim of the present paper was to investigate the effect of solids (SRT) and hydraulic (HRT) retention time on Integrated Fixed Film Activated Sludge (IFAS) University of Cape Town (UCT) membrane Bioreactor (MBR). In particular, three different pairs of SRT and HRT values were analysed, namely, Phase I 56 d/30 h, Phase II 31 d/15 h and Phase III 7 d/13 h. The short-term effect of these three SRT/HRT conditions was assessed by analysing several system performance indicators: organic carbon and biological nutrient (nitrogen and phosphorus) removal, biomass respiratory activity, activated sludge filtration properties and membrane fouling. The results showed that the decrease of SRT/…

Comparison of Two Mathematical Models for Greenhouse Gas Emission from Membrane Bioreactors

2017

In this study two mathematical models (Model I and Model II), able to predict the nitrous oxide (N2O) and carbon dioxide (CO2) emission from an University Cape Town (UCT) – membrane bioreactor (MBR) plant, have been compared. Model I considers the N2O production only during the denitrification. Model II takes into account the two ammonia-oxidizing bacteria (AOB) formation pathways for N2O. Both models were calibrated adopting real data. Results highlight that Model II had a better capability of reproducing the measured data especially in terms of N2O model outputs. Indeed, the average efficiency related to the N2O model outputs was equal to 0.3 and 0.38 for Model I and Model II respectively.

Tooth-implant connection in removable denture.

2016

When the patient cannot be rehabilitated with a fixed denture, or when he does not succeed in adapting to a traditional removable denture, a possible alternative solution consists in the use of a limited number of implants, placed in strategic positions in the arches of the patient, and subsequently connected to their residual teeth. The aim of this review is to evaluate the progress made on connections between teeth and implants in removable denture, to analyze their advantages and disadvantages and to compare the survival rate, both of the teeth and of the implants used as abutments, present in the various studies taken into examination, with the aim of being able to evaluate the effectiv…

Support of removable partial dentures in situations with a unilaterally missing canine and a curved edentulous ridge.

1997

The load and movement of abutments and removable partial dentures were examined in situations with a unilaterally missing canine and a curved edentulous ridge. These measurements were performed on a model adapted to intraoral conditions. In this simulation, removable partial dentures supported by incisors may result in failure. Spring rest support results in significantly reduced articulation vertically and horizontally when compared with solid rest support and avoids periodontal overloading.

Change of arsenite adsorption mechanism during aging of 2-line ferrihydrite in the absence of oxygen

2018

Abstract Arsenite was effectively immobilized by 2-line ferrihydrite at different pH values (4.0, 5.5 and 7.4) and adsorbent dosages (0.4, 1, and 2 g/L) in the absence of oxygen, showing an initial surface diffusion-controlled period (Stage I, 2 h). Dissolved δ 56 Fe increased during Stage I and decreased during Stage II, resulting from aging of ferrihydrite and equilibrium isotopic exchange, respectively. The ferrihydrite aging was hampered by both high As concentrations and high pH values close to the pH zpc , due to inhibition of mineral dissolution as a prerequisite for mineral transformation. During Stage I, As was adsorbed by both bidentate binuclear corner-sharing ( 2 C ) and monoden…

Gozos a la imagen de nuestra Señora de la Estrella, venerada en la escalera del Coro del Convento de Nra. Sra. del Remedio de Valencia.

El full orlat. Grav. xil. enmarcat de la Mare de Déu, flanquejat per gerros amb flors. Text del goig a dues col. separades per banda.

Gozos a nuestra Señora del Remedio de Utiel

1807

El full orlat Grav. xil. enmarcat de la Mare de Déu, flanquejat per gerros amb flors El text del goig a dues col. separades per banda

Imaging techniques for the vulnerable coronary plaque

2007

The goal of this article is to illustrate the main invasive and noninvasive diagnostic modalities to image the vulnerable coronary plaque, which is responsible for acute coronary syndrome. The main epidemiologic and histological issues are briefly discussed in order to provide an adequate background. Comprehensive coronary atherosclerosis imaging should involve visualization of the entire coronary artery tree and plaque characterization, including three-dimensional morphology, relationship with the lumen, composition, vascular remodelling and presence of inflammation. No single technique provides such a comprehensive description, and no available modality extensively identifies the vulnerab…

Atbalsts remigrantiem Cēsu, Valmieras un Smiltenes pašvaldībās

2021

Maģistra darba “Atbalsts remigrantiem Cēsu, Valmieras un Smiltenes pašvaldībās” mērķis ir noskaidrot Cēsu, Valmieras un Smiltenes pašvaldību sniegto atbalstu remigrantiem un tā atbilstību remigrantu vajadzībām. Maģistra darbs ir veltīts tam, lai apzinātu, kādus atbalsta instrumentus un mehānismus izmantot Cēsu, Valmieras un Smiltenes pašvaldības, lai pēc iespējas sekmīgāk attīstītu remigrāciju uz pašvaldībām. Kā arī pētījumā tiek apskatīts, vai atbalsts ir atbilstošs remigrantu vajadzībām. Mērķu sasniegšanai tika veiktas 13 daļēji strukturētas intervijas ar remigrantiem, pašvaldību pārstāvjiem un Vidzemes reģiona remigrācijas koordinatoriem. Iegūtā informācija tika analizēta, balstoties teo…