Effect of inlet valve timing and water blending on bioethanol HCCI combustion using forced induction and residual gas trapping

This is the post-print version of the final paper published in Fuel. The published article is available from the link below. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. Copyright @ 2007 Elsevier B.V.It has been shown previously that applying forced induction to homogeneous charge compression ignition (HCCI) combustion of bioethanol with residual gas trapping, results in a greatly extended engine load range compared to normal aspiration operation. However, at very high boost pressures, very high cylinder pressure rise rates develop. The approach documented here explores two ways that might have an effect on combustion in order to lower the maximum pressure rise rates and further improve the emissions of oxides of nitrogen (NOx); inlet valve timing and water blending. It was found that there is an optimal inlet valve timing. When the timing was significantly advanced or retarded away from the optimal, the combustion phasing could be retarded for a given lambda (excess air ratio). However, this would result in higher loads and lower lambdas for a given boost pressure, with possibly higher NOx emissions. Increasing the water content in ethanol gave similar results as the non-optimal inlet valve timing

A Predictive Model for Financial Crises: An Exploratory Public Policy Tool

This paper aims to establish an early warning system for Malaysia to project future financial crises. We investigate the macroeconomic and financial factors in predicting financial crises using the logit econometric model and monthly data with the sample period from January 1980 to December 2003. Four indicators namely regional crisis dummy, current account balance, M2 growth and real exchange rate show significance and therefore, are incorporated in crisis prediction. The early warning system’s predictive power is then examined against various crises periods including the 1997 Asian financial crisis. The empirical results show that the early warning system exhibits forecasting ability. Both in-sample and out-ofsample performance evaluations affirm the system’s ability to predict the 1997 Asian financial crisis with at least one early warning signal issued within the 12-month period prior to the actual crisis. The early warning system should be treated as a supplement to policymakers existing forecasting tools in estimating the probability of crisis and assessing a country’s vulnerability rather than as an exclusive tool for crisis prediction.- financial crisis, economic modelling, policy modelling, monetary policy

Characterisation of food fibres and their effect on starch digestion in an in-vitro system at physiological shear rates : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Anatomy and Physiology at Massey University, New Zealand

Material removed from thesis for copyright reasons: Appendix 5 - Hardacre, A.K., Yap, S-Y., Lentle, R.G., Janssen, P.W.M., & Monro, J.A. (2014). The partitioning of water in aggregates of undigested and digested dietary particles, Food Chemistry, 142, 446-454. https://doi.org/10.1016/j.foodchem.2013.07.063 Appendix 6 - Hardacre, A.K., Yap, S-Y., Lentle, R.G., & Monro, J.A. (2015). The effect of fibre and gelatinised starch type on amylolysis and apparent viscosity during in vitro digestion at a physiological shear rate, Carbohydrate Polymers, 123, 80-88. https://doi.org/10.1016/j.carbpol.2015.01.013 Appendix 7 - Hardacre, A.K., Lentle, R.G., Yap, S-Y., & Monro, J.A. (2016). Does viscosity or structure govern the rate at which starch granules are digested? Carbohydrate Polymers, 136, 667-675. https://doi.org/10.1016/j.carbpol.2015.08.060The fast pace of life promotes the excessive consumption of processed starchy food containing high levels of sugar, salt and oil; which can increase the prevalence of type II diabetes, colon and cardiovascular diseases. The addition of dietary fibres in the diet increases the viscosity of digesta, delays mixing in the gut, and promotes laxation. However, few studies attempt to quantify the possible physical and chemical effects of either soluble (food gums) and insoluble (largely cellulose) fibre in the diet. These effects may encompass the retention of water inside the fibre particles, between particles in the fibre mass and direct effects of the chemical nature of the fibre on the digestion process. In this study, the fractions of water held in the various partitions of insoluble particulate dietary fibres are quantified. The relationship between the volume fraction of soluble and insoluble dietary fibres in simulated digesta at physiological concentrations and the rheological properties of the suspension at physiological shear rates is determined. Furthermore, the impact of fibre and shear rates on the digestion of starch in-vitro at physiological shear rates was measured. This work provides the first quantitative assessment of the effects of the physical attributes of dietary fibre on the digestion of starch in-vitro, at physiological shear rates. In this work, four insoluble fibre types were used to construct aqueous suspensions containing solid volume fractions similar to those of pig digesta from the small intestine; these suspensions also were shown to have similar rheological properties to those of pig digesta at physiological shear rates. In addition, a soluble fibre (Guar gum) was used to construct solutions with viscosities comparable to those of the particulate suspensions. Gelatinised and partially gelatinised starch was added to these suspensions and its rate of digestion at 37°C under simulated small intestinal conditions was measured at shear rates covering the reported physiological range. Important results from this work include: - The proportion of water retained by a given volume of hydrated mass of large fibre particles (AllBran®) was double that of smaller particles (wheat fibre). For all of the solid particles used, the proportion of water sequestered by the intra-particulate voids was less than 4% of the volume of the particles, similar proportions were determined for indigestible particles recovered from the colon of pigs and from human faeces. - Food fibre systems containing less than 20% by volume (solid volume fraction, φ = 0.20) of insoluble dietary fibres showed Newtonian rheological properties and the viscosity of these suspensions could be predicted from φ by the Maron-Pierce model. Starch/fibre suspensions prepared with φ below 20% (φ = 0.68-0.98) had a similar viscosity to that of starch/guar suspension comprising 10% (w/v) starch and 0.4% (w/v) guar. During in-vitro digestion, the viscosity of the starch/fibre suspensions decreased logarithmically over the first 20 minutes during which about 30% of the starch was hydrolysed, this was followed by a prolonged period of slow digestion as the slowly digested starch (SDS) and resistant starch (RS) were hydrolysed. The rate of starch digestion was independent of the type of insoluble fibre and was not affected by suspension viscosities used providing shear rates could be maintained within physiological levels. For guar, rates of digestion were slowed probably due to non-competitive inhibition of the amylase by the guar. - When shear rates were below the physiological range (0.1 s-1) or gelatinisation was incomplete, the rate of digestion became linear over the first 20 minutes of digestion suggesting that the rate of digestion was limited by transport processes at low shear in viscous suspensions. - This study provides useful information regarding the limiting concentration of particles and hence viscosity of digesta in the gut if rates of digestion are to be maximised. Additionally, it is suggested that guar, even at low concentration may reduce glycemia by reducing rates of amylolysis

Technology, privacy and identity: a Hong Kong perspective

This article explores the concepts of privacy and identity in Hong Kong in relation to the law relating to data protection. It first considers the notions of privacy and identity in the light of Hong Kong's socioeconomic situation and recent postcolonial heritage. It then highlights the importance of identity management and considers the distinctions and overlaps between identity management and privacy protection. With this conceptual framework in mind, the article then considers the various laws in Hong Kong pertaining to data protection, with a focus on the aspects relating to identity management. It observes that while there is some legal protection in respect of the data relating to an individual's identity, there are other priorities which may take precedence in determining the extent of identity management under the legal system in Hong Kong. Finally, recommendations are made as to how to improve identity management within the context of data protection in Hong Kong

Do political instability, terrorism, and corruption have deterring effects on tourism development even in the presence of UNESCO heritage? A cross-country panel estimate

This article evaluates the effects of political instability, terrorism, and corruption on tourism development, particularly UNESCO-listed heritage destinations. Using a fixed-effects panel data analysis for 139 countries over the period 1999-2009, the result reveals that a one-unit increase in political instability decreases tourist arrivals and tourism revenue between 24 and 31 and 30 and 36, respectively. Furthermore, in the presence of heritage, terrorism has negative effects on tourism demand even though its effect is lower than that of political instability. However, the study shows that an increase in corruption index would not have an adverse influence on tourist arrival numbers, particularly for those countries that have historical and natural heritage. Perhaps, many experienced travelers have expectations that they would require paying bribes to corrupt authorities for travel visa or permits to some tourist destinations in order to make things accessible. Moderation effect results indicate that political instability reduces tourism demand even in UNESCO-listed heritage destinations © 2013 Cognizant Comm. Corp

Income, work and education: insights for closing the gap in urban Australia

Existing analysis of the Closing the Gap outcomes is limited by the lack of adequate wage data for Indigenous Australians. This paper attempts to redress this situation by using a geography recently developed by the ABS - Significant Urban Areas - to document the crucial relationships between income, labour force status and education. Abstract: Many factors contribute to differences in an individual’s command over resources. One of the factors is differences in labour market engagement and the level of education attainment across different geographical areas. However, existing analysis of the Closing the Gap outcomes is limited by the lack of adequate wage data for Indigenous Australians. Using the newly introduced geography Significant Urban Areas (SUAs), which distinguish between major cities, regional centres and remote areas, this paper analyses average personal income while adjusting for labour force status and education levels. We impute average wage data by focusing on the personal income of people who are employed full-time and assuming that the average weekly personal income is a reasonable approximation of wages. The findings suggest that wage differences between Indigenous and non-Indigenous Australians in urban areas are minimal after education attainment levels are adjusted for, with a gradient in wages according to the level of qualification. There are gender differences in wages in favour of men, both across SUAs and by education level. This is partly a reflection of the structure of employment and segregation in the labour market, which can reach as high as 40 per cent in some the SUAs. Considering the importance of wage data in the theory of economic development, it is essential that direct information on wages is collected in future surveys with a substantial sample of Indigenous Australians

Revisiting Galison’s ‘Aufbau/Bauhaus’ in light of Neurath’s philosophical projects

Historically, the Vienna Circle and the Dessau Bauhaus were related, with members of each group familiar with the ideas of the other. Peter Galison argues that their projects are related as well, through shared political views and methodological approach. The two main figures that connect the Vienna Circle to the Bauhaus—and the figures upon which Galison focuses—are Rudolf Carnap and Otto Neurath. Yet the connections that Galison develops do not properly capture the common themes between the Bauhaus and Neurath’s philosophical projects. We demonstrate this by considering Neurath’s philosophical commitments. We suggest different connections between Neurath’s projects and the Bauhaus, connections that are both substantive and philosophically interesting