Upper Austria University of Applied Sciences

Wels, Austria
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Kindermann H.,Upper Austria University of Applied Sciences
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2017

Banner advertising is usually placed on suitable, highly frequented websites. The extent to which the brand of a banner ad and the brand of the website influence each other, has not yet been sufficiently investigated. This article provides initial results based on a pilot study which reveals that a positively perceived website can shift a negative banner perception. Furthermore, it is shown that a congruence between banner ad and the website plays an important role. Congruent content supports each other and noncongruent content counteracts the intended advertising effect. Although the study cannot yet be considered as conclusive, the results have the potential to inform entrepreneurial practice on how and where ads should be placed. © Springer International Publishing AG 2017.

Lanzerstorfer C.,Upper Austria University of Applied Sciences
Granular Matter | Year: 2017

The flowability of the dust separated in dry off-gas cleaning systems is an important characteristic for the design of dust storage and conveying equipment. The angle of repose is often used as an indicator for the flowability of granular material. In this study the results for the flowability obtained from the angle of repose and by the ratio of the consolidation stress to the unconfined yield strength were compared for 77 dusts from various dry off-gas cleaning systems. For dust with a Sauter mean diameter of > 5 μ m the flowability indicated by the angle of repose and the results of a shear test performed at a low pre-shear load correlated reasonably. For dusts with a smaller particle size such a correlation did not exist. The values of the angle of repose were scattered with no relation to the results of the shear test. The dependence of the angle of repose on the d 32 described in the literature was confirmed for the coarser dusts only. For dusts with a smaller particle size such a relationship does not exist. For very fine dusts the angle of repose was even smaller. This effect was attributed to the visible small agglomerates formed during the angle of repose measurement. These agglomerates rolling down the slope prevented the formation of a steeper cone which limits the angle of repose. © 2017, The Author(s).

Lanzerstorfer C.,Upper Austria University of Applied Sciences
ISIJ International | Year: 2017

The dusts generated in the blast furnace process are partly recycled via the sinter plant. The amount of Zn which is recycled with these dusts is limited to avoid operational problems. Usually, the dusts from the dust catcher and the cast house dust are recycled, while the residue from second stage top-gas dedusting has to be discharged at least partly. In this study the application of air classification was investigated for maximization of the recycled fractions of the dusts at certain limits for the amount of recycled Zn. For this, approximation functions for the dependence of the Zn content in the coarse material on the fraction of the coarse material had to be derived from classification experiments. The calculations showed that the positive effect of air classification was higher at lower values of the limit for the amount of Zn recycled with the dust. Depending on the value of this limit the possible increase in dust recycling in comparison to classification of the second stage filter dust only ranged from 0.27 to 0.45 kg/t HM for air classification of second stage filter dust and cast house dust and from 0.35 to 0.79 kg/t HM for classification of all three dusts. © 2017 ISIJ.

Liu X.,Florida State University | Aichhorn A.,Upper Austria University of Applied Sciences | Liu L.,Florida State University | Li H.,Florida State University
IEEE Transactions on Smart Grid | Year: 2012

This paper proposes a coordinated control of distributed energy storage system (ESS) with traditional voltage regulators including the on-load tap changer transformers (OLTC) and step voltage regulators (SVR) to solve the voltage rise problem caused by the high photovoltaic (PV) penetration in the low-voltage distribution network. The main objective of this coordinated control is to relieve the tap changer transformer operation stress, shave the distribution network peak load and decrease the transmission and distribution resistive power losses under high solar power penetration. The proposed control method limits the energy storage depth of discharge in order to meet a more than ten-year cycle life. A benchmark distribution network model was developed in the Real Time Digital Simulator (RTDS) and the simulation results from the studied cases verified the proposed coordinated control strategy. The experimental implementation of proposed control algorithms were developed based on a power hardware-in-the-loop (PHIL) test bed with a 22 kWh ESS, a smart meter, Labview controller, and RTDS. The experimental results were consistent with those obtained from simulation study. © 2012 IEEE.

Suess D.,Vienna University of Technology | Schrefl T.,Upper Austria University of Applied Sciences
Applied Physics Letters | Year: 2013

Heat assisted recording is believed as a key future recording technology. In the work of H. J. Richter [J. Appl. Phys. 111, 033909 (2012)] it is stated that storage densities will be limited to 15-20 Tbit/in2 due to thermally induced write errors. In this letter we propose a composite structure consisting of two materials with different Curie temperatures. In this composite material the thermal write error is negligible up to areal densities of about 50-100 Tbit/in2. © 2013 AIP Publishing LLC.

Strohmeier D.,Upper Austria University of Applied Sciences
New directions for youth development | Year: 2012

The ViSC Social Competence Program has been implemented in Austrian schools within the scope of a national strategy plan, Together Against Violence. The program is a primary preventive program designed for grades 5 to 8. The prevention of aggression and bullying is defined as a school development task, and the initial implementation of the program lasts one school year. The program consists of universal and specific actions that are implemented through in-school teacher training and a class project for students. The program was evaluated with a randomized intervention control group design. Data were collected from teachers and students. Results suggest that the program reduces aggression in schools. Copyright © 2012 Wiley Periodicals, Inc., A Wiley Company.

Lawlor V.,Upper Austria University of Applied Sciences
Journal of Power Sources | Year: 2013

Micro-Tubular Solid Oxide Fuel Cells (MT-SOFCs) are small tubular shaped, ceramic based, electrochemical electrical power generation devices that operate at high temperatures and can potentially be fuelled with hydrocarbon based fuels. In comparison to Part I of this review paper series, which considered stacks of MT-SOFCs, part II aims to gather and arrange information regarding MT-SOFCs, in order provide a state of the art account for those entering the field or those interested in the technology. This review paper deals with MT-SOFC; reported architectures, geometry and cost considerations, details regarding individual cell components, reported methods of producing MT-SOFCs, reports and details regarding MT-SOFCs and reforming, reported novel modes of operation, reports regarding the mechanical properties of MT-SOFCs, comment and reports regarding SOFC/MT-SOFC reliability and durability, and finally, comment and conclusions. © 2013 Elsevier B.V. All rights reserved.

Lanzerstorfer C.,Upper Austria University of Applied Sciences
Advances in Cement Research | Year: 2016

In cement plants, large amounts of dust are generated and these have to be separated from various off-gases before discharge. The physical and flow properties of these dusts are important for the design and operation of the dust separation process and handling and storage facilities. In this study, five cement kiln dusts and three dusts from other sources in cement production were investigated. Shear tests showed that the flowability of most dust is very poor. Furthermore, the flowability depends on the consolidation stress: the higher the consolidation stress, the better the flowability. Three flowability indicators - the angle of repose, the Hausner ratio and Carr's compressibility - were also determined, but these indicators produced very inconsistent results. In most cases, the flowability of the dust was overestimated. Therefore, shear tests are strongly recommended for reliable categorisation of the flowability of dusts from cement plants.

Strohmeier D.,Upper Austria University of Applied Sciences
New directions for youth development | Year: 2012

This chapter reviews recent research on bullying from an educator's perspective. It is well known that bullying, a serious issue in schools, can be prevented when educators intervene. But research has shown that it is difficult for educators to detect bullying situations in their school and intervene competently and effectively. This chapter examines how educators can detect bullying, how they can best tackle serious cases of bullying, and how they can best prevent bullying in the long run. Copyright © 2012 Wiley Periodicals, Inc., A Wiley Company.

The focus of the present article lies on new enhanced beam finite element formulations in the absolute nodal coordinate formulation (ANCF) and its embedding in the available formulations in the literature. The ANCF has been developed in the past for the modeling of large deformations in multibody dynamics problems. In contrast to the classical nonlinear beam finite elements in literature, the ANCF does not use rotational degrees of freedom, but slope vectors for the parameterization of the orientation of the cross section. This leads to several advantages compared to the classical formulations, e.g. ANCF elements do not necessarily suffer from singularities emerging from the parameterization of rotations. In the classical large rotation vector formulation, the mass matrix is not constant with respect to the generalized coordinates. In the case of ANCF elements, a constant mass matrix follows, which is advantageous in dynamic analysis. In the standard geometrically exact formulation, the parameterization of rotations leads to a nonlinear term containing quadratic velocities. The so-called quadratic velocity vector vanishes for ANCF elements which is advantageous in dynamic applications. In the present article, existing beam finite element formulations are analyzed and improved to derive formulations which are able to solve industrial applications with high performance, efficiency and accuracy. The interest lies especially on finite element formulations for multibody dynamics systems that are capable of large deformations in order to derive accurate solutions of nonlinear engineering and research problems. Existing shear deformable ANCF beam finite elements show an overly stiff behavior caused by the locking phenomenon. Existing locking problems are discussed in this article and avoided in the proposed elements in order to gain accurate solutions. The state of the art of ANCF elements in literature is reviewed including the basic description of the kinematics, interpolation strategies and definition of elastic forces, but also problems and known disadvantages arising in the existing elements, as e.g. the locking phenomenon. Regarding the description of the elastic forces, the present article shows the two standard approaches in literature as well as new enhanced formulations to avoid locking: a continuum mechanics based formulation for the elastic forces with elimination of Poisson and shear locking, and an extended hybrid structural mechanics based formulation for the elastic forces including a term for penalizing shear and cross section deformation. The definition of the element kinematics and interpolation strategies in existing elements are discussed and compared to the according descriptions of the proposed elements. A comparison of the solution of the proposed finite elements to analytical solutions in the literature and to the solution retrieved from commercial finite element software have shown high accuracy and high order of convergence. The speed of convergence is evaluated regarding different interpolation strategies and different formulations for the elastic forces. The investigations show that the proposed elements have high potential for simulation of geometrically nonlinear problems arising from real-life multibody applications and therefore are highly competitive with existing elements in commercial finite element codes. It has to be mentioned here that most of the studies on nonlinear elements based on the ANCF in literature use linear constitutive laws. Regarding many applications in which geometric and material nonlinearities arise, elastic material models are not sufficient to represent the real problem accurately. For this reason, an extension of the material model is necessary in order to fulfill the requirements of current but also of future materials arising in engineering or research. An overview of existing nonlinear material models in literature can be found in the "Appendix". © 2014 CIMNE, Barcelona, Spain.

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