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ABSTRACT: The Flash-Reactor is a new facility for recycling of zinc containing dusts from the steel industry. Therefore the facility
must have the capabilities to process a wide range of dusts with varying zinc content. The Flash-Reactor pilot plant was successfully
set into operation at the Montanuniversität in Leoben in 2010 and another series of experiments was conducted in February
2011. Because of the various operating conditions adjustable in the facility and the compact design the Flash-Reactor can
be used as a special melting unit for powdery goods. Siemens VAI wants to build a pilot plant for dry slag granulation for
testing the possibility of integrated heat recovery, needing small amounts of liquid slag for the test performance. This is
where the Flash-Reactor enters the project as upstream melting unit. Heat recovery during slag granulation provides energy
recovery of 20 MWth or 6 MWel regarded to a slag mass flow of 1 t/min. Tests in the beginning of the last decade have proven the functionality of the compact
dry granulation process, industrial application has failed due to uncertain economic lookout for the steel industry in that
time.
Der Flash-Reaktor stellt ein neues Aggregat zum Rezyklieren von zinkhältigen Stäuben aus der Stahlindustrie dar. Dabei soll
er eine große Bandbreite an Stäuben mit teilweise sehr unterschiedlichen Zinkgehalten prozessieren können. Die Flash-Reaktor-Pilotanlage
konnte im Jahr 2010 an der Montanuniversität erfolgreich in Betrieb genommen werden, seitdem wurde auch schon eine weitere
Versuchskampagne im Februar 2011 auf der Anlage gefahren. Durch unterschiedliche Betriebsbedingungen, die in der Pilotanlage
eingestellt werden können, und durch eine kompakte Bauform eignet sich der Flash-Reaktor auch als Sonderschmelzaggregat für
staubförmige Produkte. Da Siemens VAI einen Versuchsstand zur trockenen Hochofenschlackengranulierung bauen will, um die Möglichkeit
einer integrierten Wärmerückgewinnung zu überprüfen, und daher geringe Mengen an schmelzflüssiger Schlacke für die Versuche
benötigt werden, kommt der Flash-Reaktor als vorgeschaltetes Schmelzaggregat zum Einsatz. Die fühlbare Wärme beträgt ca. 1,5
GJ/t Schlacke bei ca. 1500 °C. Bei einem Schlackefluss von 1 t/min steht ein Potenzial von ca. 20 MWth bzw. 6 MWel zur Verfügung, welches bei der Nassgranulierung nicht genützt werden kann. Versuche am Beginn des letzten Jahrzehnts haben
bewiesen, dass die Technologie grundsätzlich funktioniert, eine Umsetzung im industriellen Maßstab wurde nur durch die damaligen
unsicheren Wirtschaftsaussichten in der Stahlindustrie verhindert.
BHM Berg- und Hüttenmännische Monatshefte 05/2012; 156(9):343-346.
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Economic Papers A journal of applied economics and policy 04/2010; 18(3):34 - 48.
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ABSTRACT: The asymptotic distributions of cointegration tests are approximated using the Gamma distribution. The tests considered are for the I(1), the conditional I(1), as well as the I(2) model. Formulae for the parameters of the Gamma distributions are derived from response surfaces. The resulting approximation is flexible, easy to implement and more accurate than the standard tables previously published.
International Advances in Economic Research 01/2008; 14(2):125-141.
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ABSTRACT: In this paper, we examine eight years of Quality of Teaching (QOT) responses from an Economics Department in an Australian University. This is done to determine what factors, besides the instructor, have an impact on the raw average student evaluation scores. Most of the previous research on student ratings has been conducted in the US. One significant difference between US and Australian tertiary education is that, on average, the number of foreign undergraduate students in Australia is ten times the number in US institutions. We find that cultural background significantly affects student evaluations. Other factors that have an influence on the average QOT score include: year level; enrolment size; the quantitative nature of the subject; the gender of the student; fee-paying status by gender; course of study; the differences between the course mark and previous marks; the quality of workbooks; the quality of textbooks; and the QOT score relative to those in other subjects taught at the same time. In addition, average QOT scores for instructors who have taught in a mix of subjects are similar to those based on scores adjusted to account for subject and student characteristics.
Australian Economic Papers 02/2007; 46(1):18 - 38. · 0.11 Impact Factor
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ABSTRACT: In this paper, we examine eight years of Quality of Teaching (QOT) responses from an Economics Department in an Australian University. This is done to determine what factors, besides the instructor, have an impact on the raw average student evaluation scores. Most of the previous research on student ratings has been conducted in the US. One significant difference between US and Australian tertiary education is that, on average, the number of foreign undergraduate students in Australia is ten times the number in US institutions. We find that cultural background significantly affects student evaluations. Other factors that have an influence on the average QOT score include: year level; enrolment size; the quantitative nature of the subject; the gender of the student; fee-paying status by gender; course of study; the differences between the course mark and previous marks; the quality of workbooks; the quality of textbooks; and the QOT score relative to those in other subjects taught at the same time. In addition, average QOT scores for instructors who have taught in a mix of subjects are similar to those based on scores adjusted to account for subject and student characteristics. Copyright 2007 The Authors
Journal compilation 2007 Blackwell Publishing Ltd/University of Adelaide and Flinders University .
Australian Economic Papers 02/2007; 46(1):18-38. · 0.11 Impact Factor
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ABSTRACT: This paper considers the view that trade union power played a major role in the deterioration of macroeconomic performance in Australia in the 1970s and that the subsequent decrease in trade union power has improved Australia’s macroeconomic possibilities. Using the model of a range of equilibria, it is shown that the evidence supports these views. Increases in trade union power and unemployment benefits, the latter increasing the reservation wage upon which bargained wages are based, shifted the inflation barrier to higher rates of unemployment in the 1970s. Subsequently, the decrease in trade union power has reversed this shift such that at the end of the period, in 2003:3, the inflation barrier is at a rate of unemployment of 3.1 per cent.
Australian Journal of Labour Economics (AJLE). 01/2006; 9(3):287-304.
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ABSTRACT: In this paper we simulate the effect of an increase in the Superannuation Guarantee Levy (SGL) by 3 percent and 6 percent, respectively, on average living standards. We apply the Guest-McDonald model of optimal national saving for a small open economy. The simulations account for the projected age structure of the population, the differences in productivity of workers of different ages and the differences in consumption demands of young and older consumers. In this way we account for the impact of population ageing on living standards. To the extent that an increase in the SGL increases national saving beyond what it would otherwise have been, there are two effects on living standards. One is an intergenerational redistribution of living standards from the present to future generations. The effect is to lower living standards for approximately the next 30 years after which living standards rise, compared to their levels under the benchmark scenario. However, the rise in living standards in the distant future is negligible in discounted terms. The second effect arises from the nature of the SGL as a tax on employment. This reduces employment and therefore reduces the future cash flows available to support living standards. The negative impact of this employment effect on living standards is small according to our calculations.
Economic Analysis and Policy (EAP). 02/2002; 32(1):19-33.
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ABSTRACT: This paper calculates, using a representative-agent model of a small open economy, the optimal rate of national saving for Australia and Japan for the period from the middle 1990s to 2050. The calculations focus on the implications of making allowance for the aging structure of the population in both economies on employment participation, consumption demands, and labor productivity. It is found that for Australia the optimal rate of national saving increases up to the year 2011 and then decreases. For Japan the optimal national saving rate decreases from the mid-1990s until 2020. The subsequent pattern to 2050 is generally one of decrease with the exact pattern being sensitive to the weight placed on the consumption demands of old people. The contrast in these patterns between Australia and Japan is due to the fact that, compared with Australia, the aging effect on the structure of population in Japan occurs sooner and will be of greater severity. Copyright 2001 by Blackwell Publishing Ltd
Review of Development Economics 02/2001; 5(2):312-27. · 0.69 Impact Factor
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ABSTRACT: The authors provide an overview of papers presented at The Scholarship of Teaching Economics conference that was held at The University of Melbourne in July 2000. The objective of the conference was to bring attention to research being conducted in economic education at the tertiary level and to engage academic economists in discussion about the scholarship of teaching economics. The presentations of seven of the keynote speakers are discussed using the framework of who, what, and how of teaching economics. Who should determine the curriculum? What should be taught? And how should it be taught?
Journal of Economic Education. 02/2001; 32(3):195-201.
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ABSTRACT: This paper reviews evidence on causes of unemployment in Australia from cross-country studies of the relation between the rate of unemployment and a range of macroeconomic and institutional factors. An overview of the evolution of this literature and of the possible institutional factors that might affect labour market outcomes is presented. The main findings from the different types of studies are summarised, and results from some studies are applied to show the particular set of factors that account for increases in the rate of unemployment in Australia between the 1960s and 1990s. Finally, an evaluation of some problems with cross-country studies is presented.
10/2000;
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ABSTRACT: This paper reviews evidence on the equilibrium rate of unemployment and on causes of unemployment in Australia from empirical modelling of labour market outcomes. Three main types of models are reviewed - Phillips curve models; Multi-equation models; and Beveridge curve models. The paper begins with a simple review of labour market theory in order to provide some motivation for the empirical approaches that are examined. In the main part of the paper the three modelling approaches are reviewed. For each model the estimation methodology is described, main results on causes of unemployment from that approach are summarised, and an evaluation of the model is made.
10/2000;
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07/2000;
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ABSTRACT: This paper explores the sustainability of the Romanian current account. For this purpose we test the stationarity and cointegration of the monthly credit and debit transactions of the current account. It results these time series have unit roots for level
Journal of Asian Economics 01/1999; 10(3):445-464.
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