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The authors present their vision of the international and Ukraine’s national security in the 21st century context, analyze new challenges and security threats searching for the reason of collapse of the modern security...

Abstract The current investigation of refill friction stir spot welding (refill FSSW) Al alloy to copper primarily involved plunging the tool into bottom copper sheet to achieve both metallurgical and mechanical interfac...

Porous ceramics are widely used in fields such as heat insulation, filtration, sound absorption, and catalysis due to their good chemical stability, as well as the high permeability and large specific surface area of por...

Precedents and objectives Dr Donna Jackson-Maldonado, researcher and professor at the Centro de Estudios Lingüísticos y Literarios of the Universidad Autónoma de Querétaro in Mexico, left us on November 30, 2021. In ...

Students transitioning from colleges to universities in the United Kingdom (UK) into the second or third year of an undergraduate programme must quickly adapt to a new learning environment and new expectations. The proce...

Subjects / keywords: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials

Reconstructing phylogenies from intraspecific data (such as human mitochondrial DNA variation) is often a challenging task because of large sample sizes and small genetic distances between individuals. The resulting mult...

Current efforts to reconstruct the tree of life and histories of multigene families demand the inference of phylogenies consisting of thousands of gene sequences. However, for such large data sets even a moderate explora...

A new method called the neighbor-joining method is proposed for reconstructing phylogenetic trees from evolutionary distance data. The principle of this method is to find pairs of operational taxonomic units (OTUs [= nei...

Subjects / keywords: finite element modelling, aluminium, bonding, welding, hybrid joining; Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials

El ensayo que presentamos es una introducción a la presencia de fray Luis de León en la poesía española desde el modernismo hasta (pero no solo) la poesía social. Se ofrece un panorama crítico general de distintos ...

Abstract Self-piercing riveting (SPR) is a cold forming technique used to fasten together two or more sheets of materials with a rivet without the need to predrill a hole. The application of SPR in the automotive sector ...

Abstract Friction stir welding is a promising solid-state welding technique. However, the issue of tool wear and break restricts its wider industrial application. To avoid the tool wear and break occurring in conventiona...

Abstract Friction Stir Welding (FSW) is the most promising solid-state metals joining method introduced in this era. Compared to the conventional fusion welding methods, this FSW can produce joints with higher mechanical...

Abstract A novel coronavirus (COVID-19) was firstly identified in Wuhan by the end of 2019. China has implemented a series of preventive measures to deter COVID-19 spread and its consequences since the beginning of the...

The theory of sexual selection is the most widely accepted theory explaining the evolution of mating systems and secondary sexual characters. Polygyny is the most common mating system in mammals, and there is a strong co...

Plant phenotyping links genomics with plant ecophysiology and agronomy. It is usually performed by non-destructive, automated and image-based technology and generates information for efficient and searchable digital char...

Abstract Purpose To determine cervical biometry in pregnant women between 18 and 24 weeks of gestation and the ideal mode of measurement of cervical length in cases of curved and straight cervical morphology. Methods ...

Background Cyberbullying is presently an alarming problem worldwide due to its impact on the emotions, behaviour and psychological well-being of not only the victims, but the bullies themselves and also bystanders.Aim Th...

Abstract Leptospirosis is a worldwide zoonosis caused by pathogenic bacteria of the genus Leptospira. Lipopolysaccharide (LPS) is an immunodominant and protective antigen for Leptospira, but its biosynthesis remains poor...

Abstract Arc welding processes, especially gas metal arc welding, are a common technology for joining pieces in industrial production. Therefore, welding quality depends heavily on process settings, such as synergic para...

Este artículo, en base a un abordaje predominantemente cualitativo, analiza las trayectorias laborales de las mujeres que ejercen el servicio doméstico a través de Zolvers, la principal plataforma digital de trabajo p...

The democratisation of national defence policies and systems plays a vital role in making any country more democratic. The democratic transition of this sector in Slovenia and Montenegro has experienced a challenging ref...

Este estudo teve como objetivo examinar a concepção de adolescência/adolescente presente no discurso dos jovens, bem como de que maneira eles entendem a passagem para a chamada idade adulta. Foi feita uma discussão a...