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Found 6374 publications

A Method for Measuring Normal and Shear Stiffness of Laminate Stacks of Electric Motors

Dániel Feszty Balázs Pere Dániel Harrach Viktor Szabó

Publication Name: Periodica Polytechnica Mechanical Engineering

Publication Date: 2023-01-01

Volume: 67

Issue: 2

Page Range: 110-117

Description:

Structural simulations of electric motors require precise material models. Laminate stacks that are made of several identical steel sheets are particularly challenging to simulate using FEA. The structural stiffness of laminate stacks usually follows transversal isotropic behavior. Measuring a complete laminate stack used in passenger cars is challenging due to its size and the high testing load needed to reach real loads experienced while in operation. A new method capable of performing such measurements is presented in this article, with the help of equipment normally used for testing structures used in civil engineering. Two sets of exemplary results are presented utilizing this measurement procedure, that were performed on a real automotive rotor laminate stack: axial compression stiffness from a cyclic test, and shear stiffness at various axial preload levels. In the axial compression load case, the loading and unloading curves form a hysteresis, that changes in every test cycle. Shear stiffness shows high dependance on the axial compression preload. After loading and unloading the stack with shear loads, significant plastic deformations remain.

Open Access: Yes

DOI: 10.3311/PPme.20505

Twin Concept of fine structure constant as the 'self number-archetype' in perspective of the Pauli-Jung correspondence

Peter Varlaki Imre J. Rudas

Publication Name: Acta Polytechnica Hungarica

Publication Date: 2009-12-01

Volume: 6

Issue: 2

Page Range: 109-137

Description:

The paper - 'similarly to our earlier publications since 1993 - is trying to 'synchronize' early quantum physics, the Kalmanian representation theory, Jungian analytic psychology, and certain aesthetical categories. The number '137', the so-called inverse Fine Structure Constant (FSC), is placed at the centre of this heuristic and epistemological experiment, along with the scientific cooperation of Pauli and Jung. A new possibilistic twin concept of "controlling-observing equations" is proposed for the reinterpretation of the FSC and other Number Archetypes on the basis of the Hermeneutic and symbolic languages found in the W. Pauli and C. G. Jung " Correspondence". The second part of the paper deals with the new ways of cognition and imagination related to the "Background Control Theory" which can be identified mainly in the Pauli-Jung collaboration anticipating the new system and control approach of R E. Kalman Furthermore, we summarize this unusual attempt and give an extensive bibliography for further reading.

Open Access: Yes

DOI: DOI not available

Algorithm for D-V cells and fundamental domains, E4 space groups with broken translations in the icosahedral family

No authors available

Publication Name: Journal for Geometry and Graphics

Publication Date: 2002-01-01

Volume: 6

Issue: 1

Page Range: 1-16

Description:

As a continuation of our earlier work [2] we extend our algorithm for E4-space groups in the icosahedral family, where non-lattice translations (broken translations) occur as well. So we obtain new 4-polytopes as fundamental domains from D-V cells of crystallographic orbits. We illustrate our situations by some characteristic examples. A computer program will produce further results.

Open Access: No

DOI: DOI not available

Hydrodynamic Modeling and Comprehensive Assessment of Pier Scour Depth and Rate Induced by Wood Debris Accumulation

Muhanad Al-Jubouri R. P. Ray

Publication Name: Hydrology

Publication Date: 2024-04-01

Volume: 11

Issue: 4

Page Range: Unknown

Description:

This study mainly investigates the impact of debris accumulation on scour depth and scour hole characteristics around bridge piers. Through controlled experiments with uniform sand bed material, the influence of various debris shapes (high wedge, low wedge, triangle yield, rectangular, triangle bow, and half-cylinder), upstream debris length, downstream debris extension, and debris thickness on scour depth and scour hole area and volume around the cylindrical pier were analyzed. The findings revealed that the shape and location of debris in the water column upstream of piers are key factors that determine the depth of scour, with high wedge shapes inducing the deepest scour and potentially the largest scour hole, particularly when positioned close to the pier and fully submerged. Scenarios in which triangle bow debris was submerged at full depth upstream of the pier closely resembled situations devoid of debris. Conversely, debris extension downstream of the pier was found to reduce local scour depth while concurrently enlarging the dimensions of the scour hole. The existing scour prediction equations tend to overestimate scour depth in scenarios involving debris, particularly when applying effective and equivalent pier width. This discrepancy arises because these equations were originally developed to predict scour depth around piers in the absence of debris. In response, a refined model for predicting scour induced by debris was proposed, integrating factors such as upstream debris length, downstream extension, obstruction percentage, and debris shape factor. This model demonstrated strong agreement with experimental data within the scope of this study and underwent further validation using additional experimental datasets from other research endeavors. In conclusion, this experimental study advances the comprehension of scour processes around cylindrical bridge piers, providing valuable insights into the role of debris characteristics and positioning.

Open Access: Yes

DOI: 10.3390/hydrology11040052

Discovery of potential antiviral compounds and accelerating the therapeutic discovery against monkeypox virus

Fahad Nasser Almajhdi D. U. Ozsahin Y. Waheed Faisal Ahmad Afifa Navid Hassan Ayaz Tajamul Hussain Muhammad Irfan D. U. Ozsahin Dilber Uzun Ozsahin

Publication Name: Scientific Reports

Publication Date: 2026-12-01

Volume: 16

Issue: 1

Page Range: Unknown

Description:

Monkeypox virus is a zoonotic virus of the genus Orthopox viruses. It can be transmitted through direct or indirect contact with animals or infected ones. Owing similarity of pathogenesis with smallpox, the same drugs can be used for both viruses, but they are not specific and only help to relieve the symptoms only. Therefore, the absence of antiviral treatment or licensed vaccine highlights an urgent need, especially due to its rapid prevalence. The study screened the library of compounds to retrieve drug-like molecules that can act against monkeypox virus. The highly virulent target gene B8R having uniport ID Q3I8J0 was chosen. Targeting B8R is substantial for global health and can align with SDG 3 and awareness of disease management. The B8R was modelled via Artificial intelligence (AI) AlphaFold method and then exposed to a library of compounds. Complementary interactions in the active site were shown by molecular docking. The Complex-1 had the greatest binding affinity (–8.4 kcal/mol), followed by Complex-2 (–8.1 kcal/mol) and Complex-3 (–7.7 kcal/mol). After 125 ns, Complex-1 reached equilibrium at 7.5 Å RMSD, according to MD simulations, exhibiting stable ligand retention and reliable interactions with crucial residues Gly135 and Lys136. Complex-3 shown intermediate protein stability (6 Å RMSD) but notable ligand fluctuation (48 Å RMSF), while Complex-2 displayed increased protein RMSD (8 Å RMSD) and delayed ligand stabilisation (16 Å RMSF). These results were corroborated by PCA analysis, which showed that Complex-1 exhibits coherent structural development whereas Complex-2 and Complex-3 show scattered and compact trajectories, respectively. Complex-1 promise for Mpox viral inhibition was highlighted by the fact that it was the most stable and dynamically favourable contender overall. The N-terminal follows the folding trend. The insilico analysis not only proposed a potent compound but also provides deep insight into the behavior of protein. The proposed potent compound against this zoonotic virus can be helpful to combat the monkeypox virus by subjecting it further towards experimental investigation.

Open Access: Yes

DOI: 10.1038/s41598-026-39427-1

Effect of locally increased melted layer thickness on the mechanical properties of laser sintered tool steel parts

Imre Fekete Tamás Ibriksz István Hatos András Lajos Nagy B. Kocsis Hajnalka Hargitai

Publication Name: Iop Conference Series Materials Science and Engineering

Publication Date: 2018-10-18

Volume: 426

Issue: 1

Page Range: Unknown

Description:

Additive technologies have several advantages over conventional manufacturing, such as the freedom of geometry of the products and internal structures. There are also some limitations and problems, deriving from stopping the process during the production. By restarting the process, the building often continues with a thicker starting layer due to the deposition of two or more layers. The effect of skipped melting of layers is investigated in this paper. Maraging steel powder (MS1) was used in direct metal laser sintering (DMLS) process to produce samples with increased thickness of melted layers. The layer thickness was increased in 20 μm steps up to 160 μm with 0.5 mm offset between the increased thickness layers. Porosity caused by the uneven melting was measured by optical microscope, mechanical tests were carried out to quantify the effect of skipped layers and fractured surfaces were observed under SEM. We have found that the yield strength and tensile strength are not affected if the layer thickness is slightly increased locally in the laser sintered part, while even a small increase in porosity greatly reduces the total elongation of the specimen. The decrease of impact energy due to the porosities shows similar correlation with the decrease of percentage elongation at break. However, the Charpy impact test is much more sensitive to layer skipping, the lack of melted layers lowers the impact strength significantly.

Open Access: Yes

DOI: 10.1088/1757-899X/426/1/012014

Effect of subsoiling on the yield of sugar beet under conditions of rhizomania infection.

No authors available

Publication Name: Mededelingen (Rijksuniversiteit te Gent. Fakulteit van de Landbouwkundige en Toegepaste Biologische Wetenschappen)

Publication Date: 2002-01-01

Volume: 67

Issue: 2

Page Range: 321-325

Description:

The rhizomania is known in Hungary since 1982. The causal agent, Beet necrotic yellow vein benyvirus (BNYVV) is transmitted by a soil-borne fungus Polymyxa betae Keskin. A field experiment was done under rhizomania infested and non-infested conditions to compare the yield parameters of five tolerant and four sensitive sugar beet hybrids. Tolerant varieties produced higher root yield under rhizomania infected conditions. The root yields of the sensitive varieties were similar to the tolerant ones on the uninfested field, but the root mass of some tolerant varieties exceeded the production of the former group. Subsoiling was carried out in two strips of a heavily infested field, while conventional soil cultivation was done on the other parts. There was not any other difference in the cultivation of the treated and control areas. Sugar beet root samples were collected at the time of harvesting from the subsoiled and control plots. Beet necrotic yellow vein virus (BNYVV) infection was tested by means of ELISA. Virus content, yield and yield parameters of samples were compared. There were no significant differences in virus infection between sugar beet roots derived from subsoiled and untreated plots. Ratio of BNYVV infected plants was about 90% in both areas. However, yield and yield parameters showed remarkable difference. Root yield of treated plots, calculated from average individual root weight and 80,000 plant/ha plant density exceeded by 140% the yield of control. Sugar content was 2.6% higher and the harmful non-sugar content was lower on the subsoiled plots. Owing to the favourable chemical and technological value of beet the white sugar content was approximately three-times higher on the treated area.

Open Access: No

DOI: DOI not available

Railway simulation with the CASSANDRA simulation system

Gábor Szucs

Publication Name: Journal of Computing and Information Technology

Publication Date: 2001-01-01

Volume: 9

Issue: 2

Page Range: 133-142

Description:

In this paper a railway simulator will be presented and illustrated with a railway network model, which is used for education, i.e. the training of railway system operators. The new railway simulation system is developed using a general simulation software, CASSANDRA that is usable not only for the railway network building but for planning, analysis and optimum finding as well.

Open Access: Yes

DOI: 10.2498/cit.2001.02.04

The Influence of Managerial Values on Corporate Social Performance of SMEs in the UK: A Moderated Mediation Analysis

Sarah Mohammad Suleiman Alsyoof

Publication Name: Decision Making Applications in Management and Engineering

Publication Date: 2024-01-01

Volume: 7

Issue: 2

Page Range: 530-558

Description:

Research on the micro-foundations of corporate social performance (CSP) in small and medium-sized enterprises (SMEs) is limited. Building on upper echelons, stakeholders, and Schwartz value theories, this paper aims to investigate the influence of managerial values on SMEs’ CSP with the mediating role of managers’ CSR orientation (CSRO). The study also explores how managerial experience and educational levels moderate the mediating effects of CSRO. The study was conducted on a sample of 248 top managers from SMEs in the UK using path analysis, regression analysis, mediation analysis, and moderated mediation analysis. The findings indicate that only self-transcendence and openness to change values significantly positively affect CSP, while self-enhancement and conservation values do not. In addition, philanthropic CSRO mediates the relationship between self-transcendence values and CSP, while none of the CSRO constructs mediate the openness to change-CSP relationship. For highly experienced managers, all value dimensions influence CSP significantly, with self-transcendence being mediated by philanthropic and legal CSROs. For master's graduates, self-enhancement positively impacts CSP, partly through economic CSRO. Openness to change positively affects CSP directly, without CSRO mediation. For PhD managers, only conservation values significantly impact CSP without the mediation role of CSRO. This study presents a novel moderated mediation model that analyzes the relationship between managers' values and CSP, using CSRO as a mediator and managers' experience and education level as moderators. Not only does this paper provide in-depth insights into personal CSP drivers in SMEs, but it also enlightens managers and education policymakers about the necessity of matching personal values with CSR concerns.

Open Access: Yes

DOI: 10.31181/dmame7220241227