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Found 6289 publications

Automatic ELM detection and study of statistical ELM properties by Li-BES on COMPASS

M. Berta P. Hacek J. Krbec M. Szutyányi R. Somers M. Hron R. Pánek A. Bencze V. Weinzettl

Publication Name: 46th Eps Conference on Plasma Physics Eps 2019

Publication Date: 2019-01-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

No description provided

Open Access: Yes

DOI: DOI not available

Validation of the Overall Stability Design Methods (OSDM) for tapered members

No authors available

Publication Name: SDSS 2019 - International Colloquium on Stability and Ductility of Steel Structures

Publication Date: 2019-01-01

Volume:

Issue:

Page Range: Unknown

Description:

Two new stability design methods are demonstrated and validated: the Overall Strength Reduction Method (OSRM) and the Overall Imperfection Method (OIM). Both methods are based on the linear buckling analysis (LBA) of global structural models and use the standard reduction curves. The OSRM is formulated in the classic way using generalized slenderness and reduction factors while the OIM uses equivalent amplitude for the buckling mode based geometrical imperfection. These new design methods cover all types of buckling modes, which can be calculated by LBA of structural models composed of tapered members with arbitrary support conditions and subjected to any complex loading. This paper clarifies the mechanical interpretation and proper calculation of all the components of the two methods in case of tapered members with arbitrary support conditions. The validation is performed on GMNIA results for several different buckling situations of tapered members proving the accuracy of the OSDM.

Open Access: No

DOI: DOI not available

Drop performance of dangerous goods packages in the aspect of parcel delivery standards

Ákos Mojzes Kata Vöröskoi Thomas Trost

Publication Name: 21st Iapri World Conference on Packaging 2018 Packaging Driving A Sustainable Future

Publication Date: 2019-01-01

Volume: Unknown

Issue: Unknown

Page Range: 569-577

Description:

Requirements for dangerous goods packaging are well known, whatever version are used. The testing circumstances are strictly defined for each transportation method (road, rail, air, sea). But nowadays it is becoming a practice that courier express operators transport dangerous goods as single package. This parcel delivery method means a higher risk for all kind of logistics participants. By this service the packages are delivered fast, but handled more roughly than in comparison to LTL (less than truckload) or FTL (full truck load). Naturally, the parcel delivery sector uses its own suitability testing methods, which are also well defined. These procedures are coming from various standards such as ASTM, ISTA or corporate (FedEx) standards. This paper compares the most common parcel delivery testing conditions concerning the drop test requirements of DGR (Dangerous Goods Regulation) using packaging such as paper bag, corrugated fibreboard box, steel drum and plastic jerrycan, respectively. Then the test results were analyzed to present the differences.

Open Access: Yes

DOI: DOI not available

Oestrogens and oestrogenic substances in plant cultivation

Pál Szakál Judit Plutzer Eduard Gubó

Publication Name: Agrokemia Es Talajtan

Publication Date: 2019-01-01

Volume: 68

Issue: 2

Page Range: 385-401

Description:

A compound is oestrogenic, when -even if with low affinity but can bind to oestrogen receptors (ER)- resulting in a biological effect in oestrogen sensitive cells, which are similar to processes caused by the ovarian derived oestrogen hormones. According to literature data, due to slurry irrigation and intensive livestock manure application, due to the direct contact with the land, steroidal oestrogens, including oestrogen E1, oestradiol E2, oestriol E3, and synthetic oestrogen EE2 are ubiquitous in the fertile soil. Plants can accumulate oestrogens in their roots and shoots, which when entering the food chain may have an impact on human health. Slurry can only be applied to agricultural land with the permission of the soil protection authority, which also determines the amount of slurry that can be applied to the area. The different types of slurry differ not only in their nutrient composition but also in their EDC content. Regarding the natural hormone excretion and use of hormonal preparations it is important to consider the sex ratio and age range of livestock in the case of selection. It is important for the future that we carry out toxicological studies and place greater emphasis on the amount and potential effects of hormonal substances released by agricultural side products.

Open Access: Yes

DOI: 10.1556/0088.2019.00002

Warping transfer superelement model for bolted end-plate connections subject to 3D loads

No authors available

Publication Name: SDSS 2019 - International Colloquium on Stability and Ductility of Steel Structures

Publication Date: 2019-01-01

Volume:

Issue:

Page Range: Unknown

Description:

A simple beam element based modelling technique has been developed which makes possible to analyze frames made of I sections with column-rafter bolted end-plate connections, subject to 3D loads, compatible with the thin walled beam theory with 7DOF beam elements. The model previously developed by the same team for welded connections has been extended with the addition of linear spring elements to model the bolts located at the upper and lower beam flange level. The spring stiffnesses are calculated based on the extension of the Eurocode component method and verified by simulations performed with FEA software Abaqus.

Open Access: No

DOI: DOI not available

A fast and stable multi-level solution technique for the method of fundamental solutions

Csaba Gáspár

Publication Name: Lecture Notes in Computational Science and Engineering

Publication Date: 2019-01-01

Volume: 129

Issue: Unknown

Page Range: 19-42

Description:

The classical form of the Method of Fundamental Solutions is applied. Instead of using a single set of subtly located external sources, a special strategy of defining several sets of external source points is introduced. The sets of sources are defined by the quadtree/octtree subdivision technique controlled by the boundary collocation points in a completely automatic way, resulting in a point set, the density of the spatial distribution of which decreases quickly far from the boundary. The ‘far’ sources are interpreted to form a ‘coarse grid’, while the densely distributed ‘near-boundary’ sources are considered a ‘fine grid’ (despite they need not to have any grid structure). Based on this classification, a multi-level technique is built up, where the smoothing procedure is defined by performing some familiar iterative technique e.g. the (conjugate) gradient method. The approximate solutions are calculated by enforcing the boundary conditions in the sense of least squares. The resulting multi-level method is robust and significantly reduces the computational cost. No weakly or strongly singular integrals have to be evaluated. Moreover, the problem of severely ill-conditioned matrices is completely avoided.

Open Access: Yes

DOI: 10.1007/978-3-030-15119-5_2

Experimental investigation of single point incremental forming of aluminium alloy foils

No authors available

Publication Name: 16th IMEKO TC10 Conference 2019 "Testing, Diagnostics and Inspection as a Comprehensive Value Chain for Quality and Safety"

Publication Date: 2019-01-01

Volume:

Issue:

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: No

DOI: DOI not available

Banking applications of FCM models

Miklós F. Hatwágner Gyula Vastag L. T. Kóczy Vesa A. Niskanen

Publication Name: Studies in Computational Intelligence

Publication Date: 2019-01-01

Volume: 796

Issue: Unknown

Page Range: 61-72

Description:

Fuzzy Cognitive Map (FCMs) is an appropriate tool to describe, qualitatively analyze or simulate the behavior of complex systems. FCMs are bipolar fuzzy graphs: their building blocks are the concepts and the arcs. Concepts represent the most important components of the system, the weighted arcs define the strength and direction of cause-effect relationships among them. FCMs are created by experts in several cases. Despite the best intention the models may contain subjective information even if it was created by multiple experts. An inaccurate model may lead to misleading results, therefore it should be further analyzed before usage. Our method is able to automatically modify the connection weights and to test the effect of these changes. This way the hidden behavior of the model and the most influencing concepts can be mapped. Using the results the experts may modify the original model in order to achieve their goal. In this paper the internal operation of a department of a bank is modeled by FCM. The authors show how the modification of the connection weights affect the operation of the institute. This way it is easier to understand the working of the bank, and the most threatening dangers of the system getting into an unstable (chaotic or cyclic state) can be identified and timely preparations become possible.

Open Access: Yes

DOI: 10.1007/978-3-030-00485-9_7

Some considerations on data mining from questionnaires by constructing fuzzy signatures based on factor analysis

Dalia Susniene Ojaras Purvinis L. T. Kóczy

Publication Name: Journal of Intelligent and Fuzzy Systems

Publication Date: 2019-01-01

Volume: 36

Issue: 4

Page Range: 3739-3749

Description:

To interpret and to process the answers to questionnaires with large amount of questions may be not easy task. They are multidimensional data, sometimes with high dimensionality (in the hundreds). Therefore, it is necessary that some data reduction approach should be employed. On the other hand, answers to specific questions in questionnaires are imprecise, and the type and degree of imprecision is determined by the kind of the questions. The authors of the paper consider the imprecise answers to management type questions using a numerical scale as fuzzy degrees, and based on the semantic connections among the individual questions, a hierarchical structure is assumed. The paper suggests the use of factor analysis in order to determine this hierarchical structure, and thus the construction of fuzzy signatures from the tree graph representing the connections among the questions and answers, and the values normalized into membership degrees are assigned to the leaves of this tree. An interesting issue is how to determine the aggregations at the intermediate nodes. This may happen based on management science domain expert knowledge, and validated by the obtained results. Kohonen maps are used to demonstrate the clusters emerging among the overall fuzzy degrees representing the Fuzzy Signatures. The evaluation brings some results that partly confirm soft science based assumptions about employee behavior in the literature, and partly bring some interesting novel recognitions that may be brought in feedback to the original management science related problem, where the new method is illustrated.

Open Access: Yes

DOI: 10.3233/JIFS-18548