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Preparations for the EU’s post-2020 Multiannual Financial Framework have brought increased interest to the functional approach as a major paradigm of the EU policies towards cross-border areas. Thi...

Elastic properties of open-cell metallic foams are investigated in correlation with relative density and pore size variation. A variety of foam architectures, with open porosity above 70% (relative density below 0.30) and various pore size distributions, were modeled using Laguerre–Voronoi tessellations (LVT). The coefficient of pore volume variation, CV(V), was introduced to quantify the uniformity of designed structures and ranged between 0.5 to 2.1. Elastic behavior of the modeled foams to uniaxial compression along three orthogonal directions was analyzed using the finite element (FE) method. It is shown that Young’s modulus and Poisson’s ratio of open-cell metals is not solely a function of relative density (porosity) but the pore size variation as well. For similar porosity (approx. 74–98%), Young’s modulus and Poisson’s ratio may be reduced by approx. 25–30% and 10–25%, respectively, when CV(V) increases from 0.5 to 2.1. Furthermore, the incorporation of a relationship between Young’s modulus and the coefficient of pore volume variation to the Gibson–Ashby model is proposed.

Vitamin D3, apart from maintaining calcium and phosphate homeostasis, also has a significant influence, among others, on: the immune system, the muscular system or the circulatory system. Due to the presence of vitamin D receptors in many cells of the body, its multidirectional action is observed. Improper diet and lack of exposure to sunlight can lead to vitamin D deficiencies and promote the development of e.g. osteoporosis and rickets in children. Recent studies have shown that changes in vitamin D levels can affect the formation of metabolic diseases such as type I diabetes and lead to the development of overweight and obesity. In people with lowered levels of vitamin D occurrence of increased body weight is observed, which may be related to the hypothesis of the so-called postponing vitamin D in excessive amount of adipose tissue. On the other hand, there are reports that vitamin D reduces the amount of adipose tissue. More studies should be conducted to verify the molecular basis of the correlation of the influence of vitamin D concentration on the phenomenon of overweight and obesity.

The landscape and its perception influence the quality of life of a local community. Recreation areas bring a lot of benefits to society, also in terms of mental health. Open space and contact with nature, particularly during a crisis such as the pandemic, help alleviate the effects of the lockdown and social isolation. The study objective was to determine whether and to what extent the COVID-19 pandemic influenced the importance of recreation areas and the perception of landscape among students—a social group that experiences mood disorders increasingly often and has been severely affected by the lockdown. A survey was conducted in two stages, using a Google Forms online survey. A total of 381 students from universities in Lublin participated in the survey. The survey showed that the significance of recreation areas increased during the pandemic. The perception of landscape changed as well: the value of nature, scenic views, and the therapeutic effect of the landscape began to be appreciated to a greater extent. The survey results indicate the need to ensure the diversity of green areas and improve their accessibility. Designing these areas should also consider quiet areas as well as ensuring green mobility and places of recreation.

Geoparks currently form the basis for the development of geotourism and, therefore, proposals of new geoparks are developed in many countries, including Poland, where over 20 locations for geoparks have been proposed so far. Two national geoparks have been established thus far, while another two have received the status of UNESCO Global Geoparks None of them are located in the Carpathian Mountains. Simultaneously south-eastern Poland—the Podkarpackie Province—boasts valuable geoheritage, biotic and cultural assets. In the past, having regard for the geological heritage, several research teams proposed the creation of three geoparks encompassing the existing landscape parks in that area. However, these were proposals based solely on scientific values. The objective of the study was to comprehensively assess their tourism potential, with a particular focus on geoheritage assets. The assessment has made it possible to determine to what extent these assets meet the conditions necessary for the functioning of this type of areas, i.e., the occurrence of diverse tourist assets, well-developed infrastructure and appropriate development potential. The assessment method used is based on 25 indices forming six groups. The analyses have been carried out for districts lying within the proposed geoparks. It has been found that the analysed area has a sufficiently high geoheritage potential that can be the basis for the functioning of two geoparks. The tourist infrastructure—particularly accommodation and catering facilities and geotourist trails—needs to be expanded and improved. It is particularly important to encourage local communities to become involved and engage in business activity within the geopark.