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Publications - 6278

Optimizing adhesion in aluminum alloys: A cross-disciplinary approach to surface treatment and bond strength

Zoltán Weltsch Miklós Berczeli Ferenc Tajti

Publication Name: International Journal of Adhesion and Adhesives

Publication Date: 2025-09-01

Volume: 142

Issue: Unknown

Page Range: Unknown

Description:

As the use of aluminum structures grows due to their lightweight properties and sustainability advantages, optimizing bonding technologies is essential for ensuring strong and durable joints. This study systematically evaluates fourteen surface treatment methods applied to aluminum sheets and L-section joints, assessing their influence on adhesion performance. Surface preparation significantly impacted bond strength. Veil sanding combined with Sika® Primer-207 led to an 82 % increase in tensile strength and a 258 % increase in shear strength compared to untreated surfaces. Laser and hot deionized water treatments resulted in the highest measured surface energy (88 mN/m), improving wettability and adhesive-substrate interaction. To analyze bonding performance, a flexible polyurethane adhesive was applied to structural joints, which were tested under tensile and shear stress conditions. The results demonstrated that surface roughness, free energy, and chemical modification strongly influence failure modes. While untreated surfaces predominantly exhibited adhesive failure, optimized treatments shifted failure toward cohesive failure, indicating a stronger interfacial bond. Additionally, the correlation between surface free energy, surface roughness, and adhesive strength was examined to understand their combined effects on joint performance. The findings highlight the importance of selecting appropriate surface modification techniques to maximize adhesion and joint durability. This research provides practical insights for industries relying on aluminum bonding, offering guidance on optimizing surface treatment protocols to enhance structural integrity and long-term reliability in demanding applications.

Open Access: Yes

DOI: 10.1016/j.ijadhadh.2025.104068

A novel Gustafson–Kessel based clustering algorithm using n-Pythagorean fuzzy sets

A. S. Ranadive Dragan Pamucar Manas Singh Sakrwar

Publication Name: Systems and Soft Computing

Publication Date: 2025-12-01

Volume: 7

Issue: Unknown

Page Range: Unknown

Description:

The Gustafson–Kessel (GK) algorithm, an extension of the fuzzy c-means (FCM) clustering method, effectively handles non-spherical clusters but struggles with uncertainty in membership assignments. To address this limitation, we propose the n-Pythagorean Fuzzy Gustafson–Kessel (n-PyGK) algorithm, which incorporates an inherent hesitation degree to enhance clustering performance. The proposed algorithm is evaluated on both synthetic and real-world datasets, including the Iris dataset, using nine clustering metrics. We analyze its behavior under varying parameter settings and compare its performance with traditional clustering algorithms. Experimental results demonstrate that n-PyGK offers improved clustering accuracy and greater flexibility in parameter selection, enabling optimal performance for specific clustering indices.

Open Access: Yes

DOI: 10.1016/j.sasc.2025.200345

On the relational database type numerical programming

Béla Kiss A. Krebsz

Publication Name: Proceedings of the Third International Conference on Engineering Computational Technology

Publication Date: 2002-12-01

Volume: Unknown

Issue: Unknown

Page Range: 127-128

Description:

The numerical algorithms became quite complex and require dynamic data structures. As such, an advanced front (AF) algorithm which is a well-known and efficient algorithm of the non-structural mesh generation is given. An accelerated version of this algorithm is presented as an example to demonstrate, that a simplified relational database model is an efficient tool for handling dynamic data structures arising from numerical problems. The main advantage of this technique is the simple and uniform data structure and the application of the balanced trees for searching and modification.

Open Access: Yes

DOI: DOI not available

A morpho-phylogenetic update on ixodid ticks infesting cattle and buffalos in Vietnam, with three new species to the fauna and a checklist of all species indigenous to the country

Thanh Thi Ha Dao Jenő Kontschán Gergő Keve Duan Ngoc Pham Ngoc Nhu Duong Nóra Takács Sándor Hornok Róbert Farkas

Publication Name: Parasites and Vectors

Publication Date: 2024-12-01

Volume: 17

Issue: 1

Page Range: Unknown

Description:

Background: Southeast Asia is regarded as a hotspot for the diversity of ixodid ticks. In this geographical region, Vietnam extends through both temperate and tropical climate zones and therefore has a broad range of tick habitats. However, molecular-phylogenetic studies on ixodid tick species have not been reported from this country. Methods: In this study, 1788 ixodid ticks were collected from cattle, buffalos and a dog at 10 locations in three provinces of northern Vietnam. Tick species were identified morphologically, and representative specimens were molecularly analyzed based on the cytochrome c oxidase subunit I (cox1) and 16S rRNA genes. Fifty-nine tick species that are indigenous in Vietnam were also reviewed in the context of their typical hosts in the region. Results: Most ticks removed from cattle and buffalos were identified as Rhipicephalus microplus, including all developmental stages. Larvae and nymphs were found between January and July but adults until December. Further species identified from cattle were Rhipicephalus linnaei, Rhipicephalus haemaphysaloides, Amblyomma integrum and Haemaphysalis cornigera. Interestingly, the latter three species were represented only by adults, collected in one province: Son La. The dog was infested with nymphs and adults of R. linnaei in July. Phylogenetically, R. microplus from Vietnam belonged to clade A of this species, and R. haemaphysaloides clustered separately from ticks identified under this name in China, Taiwan and Pakistan. Amblyomma integrum from Vietnam belonged to the phylogenetic group of haplotypes of an Amblyomma sp. reported from Myanmar. The separate clustering of H. cornigera from Haemaphysalis shimoga received moderate support. Conclusions: Three tick species (R. linnaei, A. integrum and H. cornigera) are reported here for the first time in Vietnam, thus increasing the number of indigenous tick species to 62. Clade A of R. microplus and at least R. linnaei from the group of Rhipicephalus sanguineus sensu lato occur in the country. There is multiple phylogenetic evidence that different species might exist among the ticks that are reported under the name R. haemaphysaloides in South and East Asia. This is the first report of A. integrum in Southeastern Asia. Graphical Abstract: (Figure presented.)

Open Access: Yes

DOI: 10.1186/s13071-024-06384-5

Complex dental wear analysis reveals dietary shift in Triassic placodonts (Sauropsida, Sauropterygia)

Torsten M. Scheyer Ingmar Werneburg Kinga Gere András Lajos Nagy Attila Ősi

Publication Name: Swiss Journal of Palaeontology

Publication Date: 2024-12-01

Volume: 143

Issue: 1

Page Range: Unknown

Description:

Placodonts were durophagous reptiles of the Triassic seas with robust skulls, jaws, and enlarged, flat, pebble-like teeth. During their evolution, they underwent gradual craniodental changes from the Early Anisian to the Rhaetian, such as a reduction in the number of teeth, an increase in the size of the posterior palatal teeth, an elongation of the premaxilla/rostrum, and a widening of the temporal region. These changes are presumably related to changes in dietary habits, which, we hypothesise, are due to changes in the type and quality of food they consumed. In the present study, the dental wear pattern of a total of nine European Middle to Late Triassic placodont species were investigated using 2D and 3D microwear analyses to demonstrate whether there could have been a dietary shift or grouping among the different species and, whether the possible changes could be correlated with environmental changes affecting their habitats. The 3D analysis shows overlap between species with high variance between values and there is no distinct separation. The 2D analysis has distinguished two main groups. The first is characterised by low number of wear features and high percentage of large pits. The other group have a high feature number, but low percentage of small pits. The 2D analysis showed a correlation between the wear data and the size of the enlarged posterior crushing teeth. Teeth with larger sizes showed less wear feature (with higher pit ratio) but larger individual features. In contrast, the dental wear facet of smaller crushing teeth shows more but smaller wear features (with higher scratch number). This observation may be related to the size of the food consumed, i.e., the wider the crown, the larger food it could crush, producing larger features. Comparison with marine mammals suggests that the dietary preference of Placochelys, Psephoderma and Paraplacodus was not exclusively hard, thick-shelled food. They may have had a more mixed diet, similar to that of modern sea otters. The diet of Henodus may have included plant food, similar to the modern herbivore marine mammals and lizards.

Open Access: Yes

DOI: 10.1186/s13358-024-00304-x

Reconstruction Italian style: Restoration of the san domenico church and monastery, forli, Italy by gabrio funari

András Veöreös

Publication Name: Metszet

Publication Date: 2016-01-01

Volume: 2016

Issue: 5

Page Range: 26-29

Description:

The most important part of restoring old buildings could be described as giving a new function to historical heritage sites. Contemporary construction techniques might need to be applied in such a way as to resist compromising the original building's integrity. This leads to a problem of historical faithfulness best explained by the simple fact that a contemporary rendering system will not adhere to older lime washed walls. Here the clash between original use and technologies has been the motivating factor behind restoration, not the creation of a stand alone architectural statement.

Open Access: Yes

DOI: DOI not available

Modeling the Efficiency of Resource Consumption Management in Construction Under Sustainability Policy: Enriching the DSEM-ARIMA Model

Yuriy Bilan Pruethsan Sutthichaimethee Grzegorz Mentel Halyna Mishchuk Volodymyr Voloshyn Volodymyr Voloshyn

Publication Name: Sustainability Switzerland

Publication Date: 2024-12-01

Volume: 16

Issue: 24

Page Range: Unknown

Description:

The aim of this research is to study the influence of factors affecting the efficiency of resource consumption under the sustainability policy based on using the DSEM-ARIMA (Dyadic Structural Equation Modeling based on the Autoregressive Integrated Moving Average) model. The study is performed using the Thailand experience. The research findings indicate that continuous economic growth aligns with the country’s objectives, directly contributing to continuous social growth. This aligns with the country’s efficient planning. It demonstrates that the management aligns with the goal of achieving Thailand 5.0. Furthermore, considering the environmental aspect, it is found that economic and social growth directly impacts the ecological aspect due to the significant influence of resource consumption in the construction. The resource consumption in construction shows a growth rate increase of 264.59% (2043/2024), reaching 401.05 ktoe (2043), which exceeds the carrying capacity limit set at 250.25 ktoe, resulting in significant long-term environmental degradation. Additionally, considering the political aspect, it is found to have the greatest influence on the environment, exacerbating environmental damage beyond current levels. Therefore, the DSEM-ARIMA model establishes a new scenario policy, indicating that resource consumption in construction leads to environmental degradation reduced to 215.45 ktoe (2043), which does not exceed the carrying capacity. Thus, if this model is utilized, it can serve as a vital tool in formulating policies to steer the country’s growth toward Thailand 5.0 effectively.

Open Access: Yes

DOI: 10.3390/su162410945

Recurrent evolution of breathing microtunnel system in terrestrial operculate snails (Gastropoda: Caenogastropoda: Cyclophoroidea)

Virág Krizsik Barna Páll-Gergely Thomas Schwaha Josef Harl Nóra M. Magonyi Bernhard Ruthensteiner Zoltán Fehér Takahiro Asami

Publication Name: Zoological Journal of the Linnean Society

Publication Date: 2024-12-01

Volume: 202

Issue: 4

Page Range: Unknown

Description:

The Cyclophoroidea are a group of land snails possessing an operculum that seals the aperture when the snail withdraws its body into the shell. Several groups have developed snorkel-like tubes, which are open at their outer ends, for gas exchange when the operculum closes the aperture. The tube of the cyclophorid subfamily Alycaeinae is, however, closed at its outer end. Recent investigations revealed that the tube of Alycaeinae, which starts to develop in subadults, is connected to several long microtunnels that run perpendicular to the tube and open near the umbilicus. We examined snails similar to Alycaeinae and discovered three types of gas-exchange systems that differ from the system in Alycaeinae. In Laotia, the microtunnels run to separate chambers, whereas in Platyrhaphe the microtunnels run to an internal tube. In both genera, the breathing device is already present in juveniles. Lastly, in Boucardicus there is no tube, but the microtunnels reach the common opening individually. Our molecular phylogeny, based on sequence data from the 28S, H3 and COI genes indicates that the microtunnel systems of these four groups have evolved independently. Based on these findings, three new subfamilies are proposed: Boucardicinae Páll-Gergely subfam. nov. (Hainesiidae), Laotiinae Páll-Gergely subfam. nov. (Diplommatinidae), and Platyrhaphidinae Páll-Gergely subfam. nov. (Cyclophoridae).

Open Access: Yes

DOI: 10.1093/zoolinnean/zlae158

Regularization and multi-level tools in the method of fundamental solutions

Csaba Gáspár

Publication Name: Lecture Notes in Computational Science and Engineering

Publication Date: 2015-01-01

Volume: 100

Issue: Unknown

Page Range: 145-162

Description:

The Method of Fundamental Solution is applied to potential problems. The source and collocation points are supposed to coincide and are located along the boundary. The singularities due to the singularity of the fundamental solution are avoided by several techniques (regularization and desingularization). Both the monopole and the dipole formulations are investigated. The resulting algebraic systems have advantageous properties provided that pure Dirichlet or pure Neumann boundary condition is prescribed. Otherwise, the original problem is converted to a sequence of pure Dirichlet and pure Neumann subproblems, the solutions of which converge rapidly to the solution of the original mixed problem. The iteration is embedded to a multi-level context in a natural way. Thus, the computational cost can be significantly reduced, and the problem of large and ill-conditioned matrices is also avoided.

Open Access: Yes

DOI: 10.1007/978-3-319-06898-5_8