Development of Asymmeteric Membranes for Oxygen Separation by Tape Casting and Dip Coating

Ceramic membranes made from mixed ionic and electronic conductive oxide materials have received much attention over the last decade due to their ability to separate oxygen from air at 100 % selectivity. The flux through these mem- branes may be optimized by reducing their thickness. A porous support of the same composition is applied to ensure sufficient mechanical stability. The pro- cessing of these so-called asymmetric membranes is addressed in this work; for the technology to become attractive from a commercial point of view, a reliable and cost-effective processing procedure needs to be established.Phase pure La0.2Sr0.8Fe0.8Ta0.2O3−δ (LSFTa) and La0.2Sr0.8Fe0.8Al0.2O3−δ (LSFAl) powders were synthesized by solid state reaction. The powders were used to prepare porous supports by the means of aqueous based tape casting and hot-press lamination. The supports were pre-sintered at various temperatures and dip coated with an ethanol-based suspension containing sub-micrometer sized spray pyrolysis powder. Different parameters believed to affect dense layer for- mation by dip coating are discussed and related to the experimental observations. It was found that an important criteria for success is to have a similar shrinkage property in the functional and porous layer of the membrane. The most promis- ing asymmetric membrane was obtained for the LSFTa composition where dip coating two times and sintering at 1230◦C resulted in a 6?7 μm thick membrane layer and a support with 38 % open porosity.The fracture strength of LSFAl supports with ∼ 64 % porosity was also charac- terized in this work. Testing 11 specimens with the ball-on-ring method resulted in a characteristic strength of 10.7±0.5 MPa and a Weibull modulus of 5.9±1.8

Extraordinary Complement Extraction

Serbo-Croatian (SC) appears to allow extraction of PP-complements out of NPs and APs. This extraction is problematic for Bošković’s (forthcomingA) approach to phases because SC NPs and APs are phases in this system and complements of phase heads in principle do not move (Abels 2003a). I show that there is a mechanism that can be extended to account for these movements, and provide a unified account for these movements, a certain type of left-branch extraction, and extraction of inherently case-marked nominal complements, where all of these involve P-incorporation into the element moved to SpecPP. Independent evidence for P-incorporation comes from accent shift from the host to the preposition that occurs in SC

Implementation of aerogel-based plaster in Sweden -A hygrothermal parametric study on wall constructions in the Swedish building stock

As global warming continues, new solutions and technologies are constantly being sought to reduce human impact on the climate. This happens in many sectors, including the construction sector which also accounts for significant emissions. A new type of material has therefore been developed in Europe during the last decade, in this study referred to as aerogel-based plaster. It is a plaster containing aerogel granules which has a low thermal conductivity and is developed for buildings in need of renovation. As this plaster has an insulating ability, it can decrease the energy consumption of the building while the character defining elements can be preserved. The material has been studied in central European climate, while this study aims to explore the suitability of using the material in Sweden. Common building constructions in Sweden have been investigated through in-depth hygrothermal and energy simulations. Parametric studies have also been performed where factors such as damage in the water repellent layer, thickness of aerogel-based plaster, climate condition, and drying rate have been investigated. In addition, an analysis has also been made of the energy performance of the material and how it behaves in Swedish climate. The results suggest that the material can be used in the Swedish climate on many different wall constructions without the construction being damaged in terms of moisture. However, one crucial parameter is that the material is protected from rain as it can absorb a lot of water. This can be done by a suitable type of finish, such as water repellent paint. The energy simulations formed the basis for a simplified economic evaluation for the reference building, which showed that aerogel-based plaster is suitable when a thinner insulating layer shall be considered. When a thicker layer can be applied, other materials may be more beneficial since the cost of aerogel-based plaster largely depends on its thickness

The clinical effectiveness of transurethral incision of the prostate : a systematic review of randomised controlled trials

The original publication is available at www.springerlink.com.Peer reviewedPostprin

Fourier Galerkin Approach to Wave Equation with Absorbing Boundary Conditions

Numerical computation of wave propagation in a large domain usually requires significant computational effort. Hence, the considered domain must be truncated to a smaller domain of interest. In addition, special boundary conditions, which absorb the outward travelling waves, need to be implemented in order to describe the system domains correctly. In this work, the linear one dimensional wave equation is approximated by utilizing the Fourier Galerkin approach. Furthermore, the artificial boundaries are realized with absorbing boundary conditions. Within this work, a systematic work flow for setting up the wave problem, including the absorbing boundary conditions, is proposed. As a result, a convenient modal system description with an effective absorbing boundary formulation is established. Moreover, the truncated model shows high accuracy compared to the global domain

Short-term effects of carrying a school bag on the distribution of force and plantar pressure during walking of children of different levels of physical activity

Introduction: Carrying a school bag is a dominant activity that a child performs during daily productive activities. The aim of the research is to examine how carrying a school bag of different weights affects the distribution of force and plantar pressure during normal walking on the flat terrain of children of varying levels of physical activity.Methods: The pilot study included 124 students aged 11-12 from Banja Luka. According to the protocol, each group of respondents was treated with an intervention-customized school bag and a comparator-school bag that the child only opted for. For the research, the Physical Activity Questionnaire for Older Children, measurement of anthropometric parameters, school bag weight, and Zebris tape (Zebris Medical GmbH, Germany) were used for gait analysis.Results: Inactive children achieved the lowest and active children’s highest walking speed during normal walking without a bag, with their customized school bag. When carrying a custom school bag: The highest maximum force is projected on the left heel 330.72 N in inactive children, and the lowest 265.93 N in moderately active children, the highest maximum pressure on the left heel is registered in inactive children, 27.60 N/cm2, and the lowest 21.85 N/cm2 in moderately active children. The maximum force-time of % of standing time on the left foot in the middle part lasted the longest in inactive children, and the shortest active children carried their school bag 40.31% and a custom school bag 39.76%.Conclusion: High physical activity and individual adjustment to distribute the burden well allow the child to adequately respond to the loads carried by the weight of the school bag

O processo de desumanização contemporâneo e sua relação com a hiperindividualização

This work aims to establish a parallel between the hyper individualization process of the contemporary society and the dehumanization of the other, which is represented by the figure of the immigrant, the foreigner or the different. Marked by private interests and unrestrained competition, this process instigates individuals to dehumanize the other due to their own fears and insecurities, their goals are essentially private, without commitment to society and the public, leading to the construction of the other as a competitor and potentially enemy. This entire process transforms the social space into a series of isolated islands in a voluntary and involuntary way, where the first concerns the atomized individual and the second, the dehumanized individual.Este trabajo pretende establecer un paralelismo entre el proceso de hiperindividualización de la sociedad capitalista contemporánea y la deshumanización del otro, que está representado por la figura del inmigrante, el extranjero o el diferente. Marcado por intereses privados y competitividad desenfrenada, este proceso incita a los individuos a deshumanizarse entre sí, por sus miedos e inseguridades, sus objetivos son los de carácter esencialmente privado, sin compromiso con la sociedad y el público, lo que lleva a la construcción del otro como competidor y potencialmente enemigo. Todo este proceso transforma el espacio social en “islas” aisladas voluntaria e involuntariamente, donde la primera concierne al individuo atomizado y la segunda, al individuo deshumanizado.O presente trabalho tem como objetivo estabelecer um paralelo entre o processo de hiperindividualização da sociedade capitalista contemporânea e a desumanização do outro, sendo este representado pela figura do imigrante, do estrangeiro ou do diferente. Marcado pelos interesses particulares e por um concorrencialismo desmedido, esse processo instiga os indivíduos a desumanizarem uns aos outros, devido aos seus medos e inseguranças, seus objetivos são aqueles de cunho essencialmente particular, sem compromisso com a sociedade e com o público, acarretando a construção do outro como concorrente e potencialmente inimigo. Todo esse processo transforma o espaço social em “ilhas” isoladas de forma voluntária e involuntária, onde o primeiro diz respeito ao indivíduo atomizado e o segundo, ao indivíduo desumanizado.&nbsp

Materials challenges in hydrogen-fuelled gas turbines

With the increased pressure to decarbonise the power generation sector several gas turbine manufacturers are working towards increasing the hydrogen-firing capabilities of their engines towards 100%. In this review, we discuss the potential materials challenges of gas turbines fuelled with hydrogen, provide an updated overview of the most promising alloys and coatings for this application, and highlight topics requiring further research and development. Particular focus is given to the high-temperature oxidation of gas turbine materials exposed to hydrogen and steam at elevated temperatures and to the corrosion challenges of parts fabricated by additive manufacturing. Other degradation mechanisms such as hot corrosion, the dual atmosphere effect and hydrogen diffusion in the base alloys are also discussed.acceptedVersio