http://espace.library.uq.edu.au/ The University of Queensland en Fez http://blogs.law.harvard.edu/tech/rss http://espace.library.uq.edu.au/view/UQ:2989 Data obtained from an archived nine-year aging study on S5370 foam were used to develop compression set and stress–strain aging models. Compression set was characterized using a first order kinetic model and the stress–strain relationship was analyzed using a material model previously described by Rusch for flexible foams. The models were fitted to data from the aging study using Bayesian methods, which easily accommodate uncertainties in the test conditions and provide probability distributions of the model parameters. The parameter distributions were sampled using a Markov chain Monte Carlo algorithm and incorporated to effect prediction intervals and compared to data obtained from independent studies for the purpose of validation. Compression set data from the short time study of Patel and Skinner are shown to predict significantly higher compression sets, which are attributed to additional crosslinking reactions and other phenomena that do not dominate the long term aging behavior. Using data from the nine-year study, the time period required to achieve a given compression set at 25 °C is increased by 20 years or more over the predictions of Patel and Skinner. The activation energy applicable near room temperature is similar to that reported by Patel and Skinner, which is consistent with numerous physical and catalyzed chemical mechanisms. Finally, load retention predictions from the stress–strain aging model agree with independent studies at test gaps that are larger than or equal to a zero gradient test gap limit. 2006-04-24T00:00:00Z Coons, J. E. og McKay, M. D. og Hamada, M. S. http://espace.library.uq.edu.au/view/UQ:182300 Ab initio local spin density approximation calculations were performed to study the magnetic properties of hydrogenated boron nitride nanotubes (H-BNNTs). It is found that the adsorption of a single H atom on the external surface of BNNT can induce spontaneous magnetization in the H-BNNTs, whereas no magnetism is observed when two H atoms are adsorbed on two neighboring N atoms or on two neighboring B and N atoms. However, spontaneous magnetization is also found in the H-BNNTs with two H atoms on two B atoms not next to each other, the further the better. This may be experimentally accessible when the coverage of H atoms adsorbed on the external surface of BNNTs is low. Defects produce spontaneous magnetization on BNNTs. When one or three H atoms are adsorbed on vacancy defects of BNNTs, the H-BNNTs are nonmagnetic, while magnetic H-BNNT can be obtained by two H atoms adsorbed on vacancy defects, which may be difficult to control experimentally. The key issue for magnetism is the existence of unpaired electrons, which can be experimentally realized by either low coverage of hydrogen atoms or making defects on perfect BNNTs. This indicates that it is possible to tune the magnetic properties of BNNTs by hydrogenation or defects, thus providing a new synthetic route toward metal-free magnetic materials. 2009-09-03T09:21:44Z Li, Feng og Zhu, Zhonghua H. og Zhao, Mingwen W. og Xia, Yueyuan Y. http://espace.library.uq.edu.au/view/UQ:62296 Ab initio calculations have been performed to determine the energetics of oxygen atoms adsorbed onto graphene planes and the possible reaction path extracting carbon atorns in the form of carbon monoxide. Front the energetics it is confirmed that this reaction path will not significantly contribute to the gasification of well ordered carbonaceous chars. Modelling results which explore this limit Lire presented. (C) 2002 Elsevier Science Ltd, All rights reserved. 2007-08-14T00:00:00Z Frankcombe, T. J. og Bhatia, S. K. og Smith, S. C. http://espace.library.uq.edu.au/view/UQ:202267 In spite of the advances in hazard identification (HAZID) and fault diagnosis, process system failures and major industrial accidents continue to occur. 2010-04-09T00:00:00Z Seligmann, B. og Nemeth, E. og Hockings, K. og O'Brien, C. og Cameron, I. T. http://espace.library.uq.edu.au/view/UQ:277906 A novel hazard identification methodology applied to process systems is presented in this paper. This blended hazard identification (BLHAZID) methodology blends two different types of HAZID methods: the function-driven and component-driven approach. The BLHAZID method is based on a conceptual framework called the Functional Systems Framework, which describes structure-function-goal relationships in process systems.The goals of the BLHAZID methodology are to generate outcomes that contain a high coverage of hazards, describe detailed failure causality in process systems and express this knowledge in a structured form for effective reused in subsequent applications, such as fault diagnosis, operator training, design reviews, fault and event tree construction and hazard updates to satisfy major hazard facility requirements.Both the BLHAZID methodology and the Functional Systems Framework were developed with involvement and advice from two major industrial partners. An industrial case study of a benzene saturation unit is presented to illustrate how the BLHAZID methodology operates in practice. 2012-07-23T17:07:18Z Seligmann, Benjamin J. og Nemeth, Erzsébet og Hangos, Katalin M. og Cameron, Ian T. http://espace.library.uq.edu.au/view/UQ:75726 In this paper a new structural model is presented to describe the evolution of porosity of char during the gasification process. The model assumes the char structure to be composed of bundles of parallel graphite layers, and the reactivities of each layer with the gasification agent are assumed to be different to represent the different degree of heterogeneity of each layer (i.e. each layer will react with the gasification agent at a different rate). It is this difference in the reactivity that allows micropores to be created during the course of gasification. This simple structural model enables the evolution of pore volume, pore geometrical surface area and the pore size distribution to be described with respect to the extent of char burn-off. The model is tested against the experimental data of gasification of longan seed-derived char with carbon dioxide and it is found that the agreement between the model and the data is reasonably satisfactory, especially the evolution of surface area and pore volume with burn-off. 2007-08-15T00:00:00Z Junpirom, S. og Do, D. D. og Tangsathitkulchai, C. og Tangsathitkulchai, M. http://espace.library.uq.edu.au/view/UQ:104519 2007-08-23T00:00:00Z Wei, X og Wang, G og Massarotto, P og Golding, S D http://espace.library.uq.edu.au/view/UQ:187316 We present a review of our recent studies oil the accessibility of simple gases (Ar, N-2, CH4 and CO2) in disordered microporous carbons using transition state theory (TST) and molecular simulation techniques. A realistic carbon model rather than the slit-pore approximation is utilised, providing more accurate understanding, of complex adsorption equilibrium and dynamics behaviour at the molecular level in porous carbons, especially kinetic restriction of adsorbate molecules through highly constricted pore mouths of coals and molecular sieve carbons (MSC). This kinetic restriction leads to a molecular sieving effect which plays a vital role in gas separation using the MSCs. In particular, the realistic carbon model of a saccharose char used in a recent study was obtained by hybrid reverse Monte Carlo simulation. The time of adsorption or desorption of the single gas molecule between two neighbouring pores through a highly constricted window of the realistic saccharose char model was determined using TST. Finally, the validation of TST calculated results of adsorption and desorption times against experimental measurements as well as molecular dynamics Simulation is also presented in this article. (C) 2009 Curtin University of Technology and John Wiley & Sons, Ltd. 2009-11-22T00:00:00Z Nguyen, T. X. og Bhatia, S. K. http://espace.library.uq.edu.au/view/UQ:196551 Dissolved gases can preferentially accumulate at the hydrophobic solid-water interface as revealed by neutron reflectivity measurements. In this paper, atomic force microscopy (AFM) was used to examine accumulation of dissolved gases at a hydrophobic surface in water and sodium chloride solutions. The solvent-exchange method was used to artificially form gaseous domains accumulated at the interface suitable for AFM imaging. Smooth graphite surfaces were used as model surfaces to minimize the secondary effect of surface roughness on the imaging. The concentration of NaCl up to 1 M was found to have a negligible influence on the geometry and population of pre-existing nanobubbles, nanopancakes and nanobubble-nanopancake composites. The implications of the findings on coal flotation in saline water are discussed in terms of attraction between hydrophobic surfaces in water, bubble-particle attachment and hydrophobic coagulation between particles 2010-02-24T00:00:00Z Hampton, M. A. og Nguyen, A. V. http://espace.library.uq.edu.au/view/UQ:100987 2007-08-23T00:00:00Z Yuan, Z. og Keller, J. http://espace.library.uq.edu.au/view/UQ:202405 2010-04-11T00:00:00Z Koswojo, Raymond og Utomo, Rhesa Pramudhita og Ju, Yi-Hsu og Ayucitra, Aning og Soetaredjo, Felycia Edi og Sunarso, Jaka og Ismadji, Suryadi http://espace.library.uq.edu.au/view/UQ:250508 2011-09-10T00:00:00Z Vari, F. og Rossetti, T. og Prue, R. og Mahler, S. og Hart, D.N. http://espace.library.uq.edu.au/view/UQ:66395 The effect of a gas flow field on the size of raceway has been studied experimentally using a two-dimensional (2-D) cold model. It is observed that as the blast velocity from the tuyere increases, raceway size increases, and when the blast velocity is decreased from its highest value, raceway size does not change much until the velocity reaches a critical velocity. Below the critical velocity, raceway size decreases with decreasing velocity but is always larger than that for the same velocity when the velocity increased. This phenomenon is called raceway hysteresis. Raceway hysteresis has been studied in the presence of different gas flow rates and different particle densities. Raceway hysteresis has been observed in all the experiments. The effect of liquid flow, with various superficial velocities, on raceway hysteresis has also been studied. A study of raceway size hysteresis shows that interparticle and particle-wall friction have a very large effect on raceway size. A hypothesis has been proposed to describe the hysteresis phenomenon in the packed beds. The relevance of hysteresis to blast furnace raceways has been discussed. Existing literature correlations for raceway size ignore the frictional effects. Therefore, their applicability to the ironmaking blast furnace is questionable. 2007-08-15T00:00:00Z Sarkar, S. og Gupta, G. S. og Litster, J. D. og Rudolph, V. og White, E. T. og Choudhary, S. K. http://espace.library.uq.edu.au/view/UQ:237555 2011-03-20T00:07:14Z Zhao, Jing og Sunarso, Jaka og Zhou, Wei og Shao, Zongping og Ran, Ran og Liu, Shaomin http://espace.library.uq.edu.au/view/UQ:211714 2010-08-15T00:03:31Z Rufford, Thomas E. og Hulicova-Jurcakova, Denisa og Zhu, Zhonghua og Lu, Gao Qing http://espace.library.uq.edu.au/view/UQ:292545 2013-03-03T00:09:29Z Zhang, Jintao og Zhao, X. S. http://espace.library.uq.edu.au/view/UQ:97579 2007-08-24T00:00:00Z Balliu, N. E. og Cameron, I. T. og Newell, R. B. http://espace.library.uq.edu.au/view/UQ:68995 2007-08-15T00:00:00Z Balliu, N. E. og Cameron, I. T. og Newell, R. http://espace.library.uq.edu.au/view/UQ:231296 2011-03-06T00:08:03Z Niu, YJ og Sunarso, J og Liang, FL og Zhou, W og Zhu, ZH og Shao, ZP http://espace.library.uq.edu.au/view/UQ:60005 The Australian Coal Industry Research Laboratory (ACIRL) furnace is scaled to simulate slagging and fouling in operating boilers. This requires that the gas and target temperatures, the heat flux, and the flow pattern be the same as those in real boilers. The gas and target temperatures are maintained by insulating the wall and cooling the target respectively. The flow pattern of a small burner cannot be the same as a large furnace. However, this flow pattern is partially compensated for by placing the slagging panels in three vertical locations. The paper develops the models of radiant heat transfer from the flame to the deposits both in pilot-scale and full-scale furnaces. They are used to compare the effective radiant heat transfer of the pilot- and full-scale furnaces. The experimental data both from the pilot- and full-scale furnaces are used to verify the incident heat flux and temperature profiles in the pilot- and full-scale furnaces. The results showed that the thermal condition in the pilot-scale furnace meets the requirements for studying the slagging regarding the gas temperature and the incident heat flux, particularly for the panel #1. The gas temperature in the convective section also meets the requirement for studying the fouling. 2007-08-14T00:00:00Z Su, Shi og Pohl, John H. og Holcombe, Don og Hart, John A. http://espace.library.uq.edu.au/view/UQ:241173 Ru catalyst confined within the channels of multiwall carbon nanotubes (MWCNTs) is prepared by opening tube ends via mixed concentrated acid oxidation or catalytic oxidation, followed by filling via wet impregnation. The catalyst filling ratio is characterized by X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The defects and functional groups are detected and quantified by Raman, fourier transformer infrared spectroscopy (FTIR) and XPS. The results show that high catalyst filling efficiency (∼80%) can be achieved with catalytic oxidation pre-treatment. The acid oxidation process can introduce more oxygen-containing functional groups such carboxyl and phenol groups. Both FTIR and XPS provide evidence for functional groups removal during thermal treatment. The effects of the nanotube length distributions, defects and functional groups on filling efficiency have been discussed intensively. © 2011 Elsevier Ltd. All rights reserved. 2011-05-23T17:22:44Z Wang, L og Ge, L og Rufford, TE og Chen, JL og Zhou, W og Zhu, ZH og Rudolph, V http://espace.library.uq.edu.au/view/UQ:287887 2012-12-23T01:21:16Z Zhang, L. L. og Xiong, Zhigang og Zhao, X. S. http://espace.library.uq.edu.au/view/UQ:65720 This paper presents a comprehensive study of sludge floc characteristics and their impact on compressibility and settleability of activated sludge in full scale wastewater treatment processes. The sludge flocs were characterised by morphological (floc size distribution, fractal dimension, filament index), physical (flocculating ability, viscosity, hydrophobicity and surface charge) and chemical (polymeric constituents and metal content) parameters. Compressibility and settleability were defined in terms of the sludge volume index (SVI) and zone settling velocity (ZSV). The floc morphological and physical properties had important influence on the sludge compressibility and settleability. Sludges containing large flocs and high quantities of filaments, corresponding to lower values of fractal dimension (D-f), demonstrated poor compressibility and settleability. Sludge flocs with high flocculating ability had lower SVI and higher ZSV, whereas high values of hydrophobicity, negative surface charge and viscosity of the sludge flocs correlated to high SVI and low ZSV. The quantity of the polymeric compounds protein. humic substances and carbohydrate in the sludge and the extracted extracellular polymeric substances (EPS) had significant positive correlations with SVI. The ZSV was quantitatively independent of the polymeric constituents. High concentrations of the extracted EPS were related to poor compressibility and settleability. The cationic ions Ca, Mg, Al and Fe in the sludge improved significantly the sludge compressibility and settleability. (C) 2003 Elsevier Science B.V. All rights reserved. 2007-08-15T00:00:00Z Jin, B og Wilen, BM og Lant, P http://espace.library.uq.edu.au/view/UQ:206118 In this paper we address problems associated with the calculation of the surface excess as traditionally carried out for gas adsorption on surfaces. This calculation is done through a series of steps, one of which is the application of the BET equation for the determination of surface area. The BET theory, despite its popularity, has many unjustified assumptions, requires a choice of the molecular projection area and arbitrary adjustment of the relative pressure range of the BET plot to suit the requirement of a linear best fit. The surface excess, in terms of mol per unit surface area, is therefore subject to compounded errors resulting from these factors. We quantify this with a detailed computer appraisal of adsorption of argon on a graphite surface under sub-critical and supercritical conditions. Careful consideration is paid to the bulk gas volume in the adsorption cell, and it is found that an incorrect estimate of the void volume can lead to a significant error in the surface excess per unit area. This is more pronounced with supercritical adsorption because for a given mass of adsorbent even a 0.1% over-estimation of the void volume can change a correct positive surface excess to a negative one at high pressures. © 2010 Elsevier Ltd. All rights reserved. 2010-06-13T00:00:00Z Do, D.D. og Do, H.D. og Nicholson, D. http://espace.library.uq.edu.au/view/UQ:275579 Adsorption isotherms and isosteric heats have been studied experimentally and by computer simulation for the krypton-graphitic hexagonal pore and krypton-graphite planar surface systems in the 60-109 K temperature range. The existence of a 2D transition in the sub-monolayer film on the basal plane of graphite that is observed experimentally is confirmed by the computer simulation results, but this transition is not observed in graphitic hexagonal pores because the onset of adsorption occurs at the junctions of adjacent pore walls, and the mechanism of surface adsorption is the spreading of adsorbate from the junction towards the basal planes until the first layer is completed. This is followed by molecular layering of higher layers, and then by capillary condensation when the empty core is small enough. 2012-06-10T16:31:14Z Wang, Yao og Razak, Musab Abdul og Do, D.D. og Horikawa, Toshihide og Morishige, Kunimitsu og Nicholson, D. http://espace.library.uq.edu.au/view/UQ:274331 Arsenic contained in sulphides such as enargite, tennantite and arsenopyrite can represent a significant penalty element in base metals production. There are significant economic advantages to achieving a separation of arsenic bearing minerals at an early stage in processing, but to date no feasible widely applicable commercial method of separation at the flotation stage has been developed. This review focuses on the current state of knowledge in the selective flotation of enargite, commonly found in association with non-arsenic copper sulphide mineralisation. Due to its similar flotation properties with many other copper sulphides, enargite is typically recovered together with the copper minerals, producing a high arsenic bulk concentrate which is costly and problematic to process. Special consideration is given to the various approaches used in the study of the surface chemistry of enargite in different environments, and the implications for the flotation of enargite. Developments in the various approaches in the selective flotation of enargite are critically reviewed and discussed. 2012-05-21T22:12:24Z Plackowski, Chris og Nguyen, Anh V. og Bruckard, Warren J. http://espace.library.uq.edu.au/view/UQ:185866 2009-11-12T00:00:00Z Chandra, TC og Mirna, MM og Sunarso, Jaka og Sudaryanto, Y og Ismadji, S http://espace.library.uq.edu.au/view/UQ:150947 2008-06-06T00:00:00Z Hamadi, N. K. og Chen, X. D. og Farid, M. M. og Lu, G. http://espace.library.uq.edu.au/view/UQ:150922 2008-06-06T00:00:00Z Zhu, Z. og Lu, G. http://espace.library.uq.edu.au/view/UQ:122120 The effect of calcium on activated sludge flocculation dynamics is investigated using a unique experimental technique. The technique allows on-line analysis of the size of activated sludge flocs during flocculation and provides valuable insight into the mechanisms of flocculation. Activated sludge samples were firstly sonicated for 3 minutes at 50W and then stirred at 100 rpm. The floc size was subsequently measured on-line using a Malvern Mastersizer/E. For concentrations of calcium less than 4 meq/L no significant increase in final floc size was observed even though an increase in the initial rate of change of floc size could be seen. Addition of calcium greater than 4 meq/L resulted in a dramatic increase in floc size. Results from this investigation support the theory that cations are involved in flocculation through cationic bridging, and will be used in ongoing investigations to model the flocculation process. 2008-01-25T00:00:00Z Biggs, C. A. og Ford, A. M. og Lant, P. A. http://espace.library.uq.edu.au/view/UQ:298560 Nitrogen-doped ZnO bundle-like nanoparticles were prepared by heating ZnOHF precursor at different temperatures under an ammonia atmosphere. ZnOHF gradually transformed to N-ZnO with the increase of the heating temperature, and the as-prepared N-ZnO nanoparticles preserved the original morphologies of ZnOHF at moderate heating temperature. The N-ZnO nanoparticles demonstrated drastically enhanced absorption in the visible region compared with the commercial ZnO and N-ZnO derived from commercial ZnO. Theoretical calculations indicated that the contribution of nitrogen to the top of the valence band (VB) of ZnO plays the major role of extending the absorption of ZnO to the visible region. The as-prepared N-ZnO showed high photocatalytic activity for the visible-light-induced water oxidation, and the activity can be further greatly enhanced by loading IrO2 cocatalyst. To our knowledge, this is the first report of realizing photocatalytic water oxidation on non-metal-doped ZnO under visible light without applied bias, thus adding new value to the band gap engineering of benchmark ZnO for efficient solar energy utilization. 2013-04-28T00:15:28Z Zong, Xu og Sun, Chenghua og Yu, Hua og Chen, Zhi Gang og Xing, Zheng og Ye, Delai og Lu, Gao Qing (Max) og Li, Xinyong og Wang, Lianzhou http://espace.library.uq.edu.au/view/UQ:292591 There is increasing pressure to upgrade effluent ponds for phosphorus removal. Active slag filters offer a solution, but design information is limited. Hydraulic retention time (HRT) is a key factor in filter design because it controls filter treatment efficiency as well the filter substrate lifespan. This paper reports on a rapid method of continual looping of effluent through a filter column to obtain a relationship between HRT and phosphorus removal efficiency. Phosphorus removal declined logarithmically with respect to retention time. While the mechanisms that yield this relationship involve complex mass transfer and adsorption of phosphorus to Fe oxyhydroxide sites, in general terms, the adsorption rate is proportional to the adsorbate effluent concentration. Waste stabilization pond effluent treated by the slag achieved phosphorus removal efficiencies over 90% at extended HRTs greater than 70 hours, while 80% removal was obtainable in 30 hours. Higher phosphorus removal was achieved for slag treating real effluent compared with synthetic phosphate solution. This can be explained by: (1) different starting phosphorus concentrations in the synthetic phosphate solution and real effluent; and (2) the presence of constituents in real effluent that can enhance phosphorus removal, such as oxidized iron compounds, cations, algae and humic complexes. This new technique, which proved capable of replicating treatment efficiencies obtained from long-term column studies, offers rapid assessment of phosphorus removal efficiency as a function of retention time and thus will enable design engineers to size active filters on the basis of achieving the required phosphorus removal standards. 2013-03-03T00:36:25Z Shilton, Andy og Chen, Leon og Elemetri, Ibrahim og Pratt, Chris og Pratt, Steven http://espace.library.uq.edu.au/view/UQ:201809 2010-04-06T15:05:30Z Acharya, S. og Hajra, J. P. http://espace.library.uq.edu.au/view/UQ:176104 At present, there is a scarcity of data on the activities of iron oxides in the FeO-Fe2O3-CaO-SiO2 slag system at intermediate oxygen partial pressures and temperatures relevant to sulfide smelting and nonferrous metallurgy. The present study provides relevant data at temperatures between 1573 and 1673 K and partial pressures of oxygen between 10-9 and 10-4 atm. The experiments were carried out by equilibrating the slag in a CO-CO2 gas mixture in a platinum crucible, after which the phases of all the experimental samples, including the platinum foil, were analyzed by electron probe microanalysis (EPMA). Where only liquid phase or liquid phase and tridymite (SiO2) were observed, wet chemical analysis was used to determine the ratio of (mass pct Fe2+)/(mass pct Fe3+). Activity and activity coefficients for FeO (liquid) and FeO1.33 (solid) were calculated. Tendencies of the effect of the (CaO/SiO2) ratio, temperature, and oxygen partial pressure on these thermochemical quantities are discussed in this article. 2009-04-16T08:56:52Z Henao, Hector M. og Itagaki, Kimio http://espace.library.uq.edu.au/view/UQ:175818 2009-04-15T00:00:00Z Henao Zapata, Hector Mario og Itagaki, Kimio http://espace.library.uq.edu.au/view/UQ:300187 2013-05-16T09:41:47Z Cameron, Ian og Birkett, Greg http://espace.library.uq.edu.au/view/UQ:134816 2008-04-08T00:00:00Z Prime, E. L. og Hamid, Z. A. A. og Cooper-White, J. J. og Qiao, G. G. http://espace.library.uq.edu.au/view/UQ:61339 Due to the socio-economic inhomogeneity of communities in developing countries, the selection of sanitation systems is a complex task. To assist planners and communities in assessing the suitability of alternatives, the decision support system SANEX™ was developed. SANEX™ evaluates alternatives in two steps. First, Conjunctive Elimination, based on 20 mainly technical criteria, is used to screen feasible alternatives. Subsequently, a model derived from Multiattribute Utility Technique (MAUT) uses technical, socio-cultural and institutional criteria to compare the remaining alternatives with regard to their implementability and sustainability. This paper presents the SANEX™ algorithm, examples of its application in practice, and results obtained from field testing. 2007-08-14T00:00:00Z Loetscher, Thomas og Keller, Jurg http://espace.library.uq.edu.au/view/UQ:228187 2011-02-06T00:00:52Z Hudson, JE og Mills, RJ og Frith, JE og Brooke, G og Jaramillo-Ferrada, P og Wolvetang, EJ og Cooper-White, JJ http://espace.library.uq.edu.au/view/UQ:135829 A configuration of dense mixed ionic and electronic conducting (MIEC) membrane with layered morphological structure for oxygen separation, which combines the benefits of high oxygen permeation flux of cobalt-based membrane, high chemical stability of iron-based perovskite and high mechanical strength of thick membrane, was studied. The membrane is normally composed of two layers; each layer is a dense MIEC oxide. The substrate layer is a thick dense membrane with high oxygen permeability but relatively lower chemical stability. The feasibility of dense thick Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF5582) membrane as the substrate layer and Ba0.5Sr0.5Co0.2Fe0.8O3-delta (BSCF5528) as the thin-film layer was mainly experimentally investigated. Both the BSCF5582 and the BSCF5528 show the same cubic perovskite structure and the similar lattice constant with no detrimental reaction products formed. By optimizing fabrication parameters of a simple dry pressing process, dual-layered membrane, free of cracks, was successfully fabricated. The oxygen permeation flux of a dual-layered membrane with the thin-film BSCF5528 layer facing to the sweep gas reached 2.1 mL cm(-2) min(-1) [STP] (1.56 x 10(-6) mol cm(-2) s(-1)) at 900 degrees C, which is about 3.5 times higher than that of the BSCF5528 membrane (0.6 mL cm(-2) min(-1), [STP] (4.46 x 10(-7) mol cm(-2) s(-1)) under the same conditions. (C) 2007 Elsevier B.V. All rights reserved. 2008-04-21T00:00:00Z Chen, ZH og Shao, ZP og Ran, R og Zhou, W og Zeng, PY og Liu, SM http://espace.library.uq.edu.au/view/UQ:223481 2010-12-05T00:07:27Z Jiao, Yan og Du, Aijun og Zhu, Zhonghua og Rudolph, Victor og Smith, Sean C. http://espace.library.uq.edu.au/view/UQ:241177 2011-05-23T17:31:34Z Jiao, Yan og Du, Aijun og Zhu, Zhonghua og Rudolph, Victor og Lu, Gao Qing (Max) og Smith, Sean C. http://espace.library.uq.edu.au/view/UQ:269382 2012-03-08T16:10:50Z Middelberg, Anton P. J. og Dimitrijev-Dwyer, Mirjana http://espace.library.uq.edu.au/view/UQ:235235 2011-03-13T00:11:57Z Yang, Jie og Zhou, Liang og Zhao, Lingzhi og Zhang, Hongwei og Yin, Jiani og Wei, Guangfeng og Qian, Kun og Wang, Yunhua og Yu, Chengzhong http://espace.library.uq.edu.au/view/UQ:161971 2009-01-28T00:00:00Z Li, Q. og Rudolph, V. og Wang, F. og Horio, M. http://espace.library.uq.edu.au/view/UQ:134843 The interaction between two gelled alginate surfaces in a variety of solution environments was studied using a Texture Analyser. The influence of both the applied force and contact time on adhesion was investigated. The Young's modulus of the alginate gels in each environment was also determined. It was found that experiments performed in calcium chloride solutions with pre-cut flat surfaces offered the best reproducibility of measurements, due to the removal of the driving force for calcium exchange to the surrounding solution. Systematic trends were observed for this particular system: an increase in either applied force or contact time between the gelled surfaces gave rise to higher adhesion values. This study provides a solid protocol for investigating interactions between gelled biopolymer surfaces and has implications in particle-particle interaction and bulk rheological behaviour in particulate gel systems. Crown Copyright © 2007. 2008-04-08T00:00:00Z Walewijk, A. og Cooper-White, J. J. og Dunstan, D. E. http://espace.library.uq.edu.au/view/UQ:134153 Due to increasing clinical demand for adipose tissue, a suitable scaffold for engineering adipose tissue constructs is needed. In this study, we have developed a three-dimensional (3-D) culture system using bone marrow-derived mesenchymal stem cells (BM-MSC) and a Pluronic F-127 hydrogel scaffold as a step towards the in vitro tissue engineering of fat. BM-MSC were dispersed into a Pluronic F-127 hydrogel with or without type I collagen added. The adipogenic differentiation of the BM-MSC was assessed by cellular morphology and further confirmed by Oil Red O staining. The BM-MSC differentiated into adipocytes in Pluronic F-127 in the presence of adipogenic stimuli over a period of 2 weeks, with some differentiation present even in absence of such stimuli. The addition of type I collagen to the Pluronic F-127 caused the BM-MSC to aggregate into clumps, thereby generating an uneven adipogenic response, which was not desirable. 2008-03-31T00:00:00Z Vashi, A. V. og Keramidaris, E. og Abberton, K. M. og Morrison, W. A. og Wilson, J. L. og O'Connor, A. J. og Cooper-White, J. J. og Thompson, E. W. http://espace.library.uq.edu.au/view/UQ:97758 2007-08-24T00:00:00Z Li, Q. og Wang, F. og Rudolph, V. og Kajikawa, S-I. og Horio, M. http://espace.library.uq.edu.au/view/UQ:268470 We report a comparison of the adsorption and transport characteristics of one-site and five-site molecular models of methane in silica nanopores, using grand canonical Monte Carlo and equilibrium molecular dynamics simulations. It is found that while the two models show similar effective molecular sizes, based on similar high-pressure densities in the bulk and nanopore fluids, the conventional parameters of the one-site model yield somewhat stronger intermolecular and pore wall interaction. This leads to higher densities in the bulk and adsorbed fluids at intermediate pressures, for the one-site model. However, the self- and collective-diffusion coefficients are similar for the two models for most nanopores, except at low densities in large mesopores. In this case, the five-site model shows slightly larger low-density diffusivity, due to its weaker interaction with the pore surface. On the basis of comparison with molecular dynamics simulations for the five-site model fluid, the predictive ability of our recent frictional theory of transport in nanopores is confirmed over a wide range of densities and pore diameters, using only the low-density diffusivity from a single simulation. Exceptions are found in the region of the critical point where the correlation length of the fluid diverges and when intermolecular interactions become significant in narrow nanopores where the fluid is nearly one-dimensional. In such cases, the local average density model used to estimate local transport properties becomes inaccurate. 2012-02-26T06:05:44Z Bhatia, S.K. og Nicholson, D. http://espace.library.uq.edu.au/view/UQ:259003 2011-10-22T18:42:55Z Sun, Aihua og Xiong, Zhigang og Xu, Yiming