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Found 6289 publications

Investigation of railroad ballast particle breakage

Szabolcs Fischer Erika Juhasz

Publication Name: Pollack Periodica

Publication Date: 2019-01-01

Volume: 14

Issue: 2

Page Range: 3-14

Description:

This paper summarizes the authors up-to-date results in the research topic of railway ballast particles breakage test with individual laboratory test. In the past few years there were a lot of railway rehabilitation and maintenance project in Hungary, as well as abroad. The largest part of worlds railways has traditional superstructure, i.e. they are so called ballasted tracks. The railway ballast is the highest mass in the railways superstructure. Nowadays, it is a naturally fact that there is enough quantity of railway ballast in adequate quality. However, due to the modifications and restrictions in the related regulations since 2010, there are only few quarries in Hungary, which are able to ensure adequate railway ballast material for railway construction and maintenance projects for speed values between 120 and 160 km/h. Quarrying industry is stricken by aggravated environmental, heritage and conservation regulations year by year, it limits the accessibility of mineral wealth in significant manner. This fact with quality requirements means supply and quality risk in production of railway ballast in medium term. The main goal of authors research is to be able to simulate the stress-strain effect of ballast particles in real and objective manner in laboratory circumstances, as well as in discrete element method modeling. This paper introduces the exact assembly of executed laboratory test and newest test results. The authors summarize the up-to-date international literature review, using that they give short outlook to the planned research with research directions in near future.

Open Access: Yes

DOI: 10.1556/606.2019.14.2.1

Development of a low-fat lactose-free dairy spread containing viable lactic acid bacteria – Part 2: Texture analysis and sensory evaluation

Gábor Kátay László Varga

Publication Name: Elelmiszervizsgalati Kozlemenyek

Publication Date: 2019-01-01

Volume: 65

Issue: 3

Page Range: 2573-2588

Description:

The objective of our work was to compare the main texture characteristics of the low-fat (30%), lactose-free dairy spread developed by us, containing viable lactic acid bacteria, and those of commercially available dairy spreads by an objective, reproducible, instrumental test, and then to assess the expected market reaction to our new product. The results of the rheological tests have shown that, in terms of its texture, our lactose-free dairy spread is similar to currently commercially available similar dairy products of adequate quality. Compared to 25 to 39% fat products, it is neither softer, nor stickier, its spreadability is close to that of usual dairy spreads. The judges (250 people) found the flavor and texture of the developed product significantly better (P<0.05) than those of one of the traditional dairy spreads that has been available in stores for a long time. However, in terms of spreadability, the latter dairy product was found to be superior (P<0.05). It was found that our new product could be received well when placed on the market, however, it should be emphasized during its introduction that, in addition to the ideal texture characteristics and nutritional physiology properties of the well-known and popular dairy spreads, it also has added functional benefits since it is lactose-free and contains viable lactic acid bacteria.

Open Access: Yes

DOI: DOI not available

Linear state space modeling and control teaching in maxwhere virtual laboratory

Miklós Kuczmann Tamás Budai

Publication Name: Acta Polytechnica Hungarica

Publication Date: 2019-01-01

Volume: 16

Issue: 6

Page Range: 27-39

Description:

It is widely known that virtual laboratories can improve and complete university lectures. This paper presents laboratories, that allow engineering students to design a pole placement based controller for typical control problems: inverted pendulum, Furuta pendulum, crane, ball and beam. The dynamics of the plants and instructions for controller design and test are provided on smartboards of the virtual laboratory. The controller can be designed by the help of Octave Online. Finally, the controller performance can be studied by the model of the real-life application. The mathematical models and controller design are presented as well as the experiences in the virtual laboratory of control engineering.

Open Access: Yes

DOI: 10.12700/APH.16.6.2019.6.3

Minimum of Constrained OWA Aggregation Problem with a Single Constraint

Lucian Coroianu Robert Fuller

Publication Name: Lecture Notes in Computer Science Including Subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics

Publication Date: 2019-01-01

Volume: 11291 LNAI

Issue: Unknown

Page Range: 183-192

Description:

In a recent paper we found an analytical formula for the constrained ordered weighted aggregation problem (OWA) when we need to maximize the objective function. In this note we prove that the method works in the case when we need to minimize the objective function. If in the case of the maximization problem we need to rearrange the coefficients in the constrained in nondecreasing order, for the nontrivial minimization problem, it suffice to rearrange them in nonincreasing order.

Open Access: Yes

DOI: 10.1007/978-3-030-12544-8_15

Determination of two color agents in hard boiled candy by laser-based photoacoustic spectroscopy and colorimetry

Mihály Kovács David Richfield Ottó Dóka

Publication Name: Carpathian Journal of Food Science and Technology

Publication Date: 2019-01-01

Volume: 11

Issue: 4

Page Range: 126-132

Description:

Determination of color agents was performed by laser-based photoacoustic spectroscopy (LPAS) and colorimetry in hard boiled candies containing two different colorants (anthocyanin and beta carotene). LPAS and colorimetry are fast and direct methods which do not require any chemicals or complicated sample preparation such as extraction. Both LPAS and colorimetry were shown to be suitable for quick determination of anthocyanin and beta carotene content in hard boiled candies. The determination of anthocyanin content in colored hard-boiled candies is possible by LPAS at 532 nm or by colorimetry using ΔE*, while the beta carotene content can be measured by LPAS at 473 nm or by colorimetry using the Hue color index.

Open Access: Yes

DOI: 10.34302/2019.11.4.11

Recent studies on thermodynamic processes in nano-ceramic thermal insulation coatings

David Bozsaky

Publication Name: Pollack Periodica

Publication Date: 2019-01-01

Volume: 14

Issue: 1

Page Range: 107-116

Description:

Among nanotechnology-based thermal insulation materials thermodynamic performance of nano-ceramic coatings generates intensive discussions. Complete agreement has not been found yet about the mechanism of their insulating effect. In the Laboratory of Building Materials and Building Physics at Széchenyi István University (Győr, Hungary) heat transfer resistance experiments have been performed in order to describe thermodynamic processes inside nano-ceramic coatings. Previous studies finding after new measurements conducted in 2016-2017 also supported the former assumption that in case of nano-ceramic coatings convective heat transfer coefficient might be taken into account in a different way. Results also showed that thermal insulating effect of nano-ceramic coatings could be caused by a relatively high surface heat transfer resistance.

Open Access: Yes

DOI: 10.1556/606.2019.14.1.11

Experimental investigation of single point incremental forming of aluminium alloy foils

Imre Paniti Dóra Harangozó Zsolt János Viharos

Publication Name: 16th Imeko Tc10 Conference 2019 Amp Amp Amp Amp Amp Quot Testing Diagnostics and Inspection as A Comprehensive Value Chain for Quality and Safety Amp Amp Amp Amp Amp Quot

Publication Date: 2019-01-01

Volume: Unknown

Issue: Unknown

Page Range: 50-55

Description:

Incremental Sheet Forming is a prosperous process to manufacture sheet metal parts that is well adapted for prototypes or small batch production. Compared to traditional sheet forming technologies this relatively slow process is only profitable for the above mentioned production types but it can be used in different applications in automotive and aircraft industries, in architecture engineering and in medical aids manufacturing. In this paper indirectly obtained axial forming force on Single Point Incremental Forming (SPIF) of variable wall angle geometry were studied under different process parameters. The estimation of the forces on AlMn1Mg1 sheets with 0.22 mm initial thickness is performed by continuous monitoring of servo motor currents. The deformation states of the formed parts were analysed using the ARGUS optical strain measurement system of GOM. Interaction plot of forming speed, incremental depth, tool diameter and lubrication were also reported.

Open Access: Yes

DOI: DOI not available

On possibilistic version of distance covariance and correlation

István Harmati Robert Fuller

Publication Name: Studies in Computational Intelligence

Publication Date: 2019-01-01

Volume: 796

Issue: Unknown

Page Range: 175-181

Description:

Distance correlation is a relatively new measure of dependence in probability theory and statistics, which has the great advantage that it gives zero if and only if the variables are independent. In this paper we define its possibilistic version. Namely, we equip each γ -level set of the joint possibility distribution with a uniform probability distribution, then we determine the probabilistic distance covariance and correlation between the marginal distributions. Finally, the possibilistic distance covariance and correlation is computed as the weighted average of these probabilistic measures of dependence.

Open Access: Yes

DOI: 10.1007/978-3-030-00485-9_20

The Role of the Civil Sector in Contribution to Social Well-Being and in Shaping Active Citizenship

Adrienn Reisinger Márta Nárai

Publication Name: Springer Proceedings in Business and Economics

Publication Date: 2019-01-01

Volume: Unknown

Issue: Unknown

Page Range: 101-118

Description:

Nowadays social and economic issues can have unfavourable consequences; social problems both at the global and local level are outstanding and it is essential to find solutions because of the efficient functioning of the economy and the society. Also, state and for-profit actors can take part in solving these problems, but there are lots of services which can be provided only by civil organizations. The first part of the paper presents the concept of civil organizations and current issues of them in Hungary. After that, it describes the way of their contribution to the active citizenship and to social well-being based on theoretical and empirical background. We made a questionnaire research in 2013 among civil organizations at the regional level in Hungary; we would like to show the main results of it. This paper presents a review of the main participatory forms of the organizations through which they can contribute to the improvement of the services and to the expanding of the supply. An important message of the paper is that civil organizations cannot operate without active citizens, our study will also show the methods how civil organizations can contribute to the active citizenship and what kind of elements and barriers have this process. This paper can add to the literature of the civil organizations and can be useful both for policy makers, researchers and citizens.

Open Access: Yes

DOI: 10.1007/978-3-319-89872-8_8