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An electromagnetic field (EMF) has been shown to have various stimulatory or inhibitory effects on microorganisms. Over the years, growing interest in this topic led to numerous discoveries suggesting the potential applicability of EMF in biotechnological processes. Among these observations are stimulative effects of this physical influence resulting in intensified biomass production, modification of metabolic activity, or pigments secretion. In this review, we present the current state of the art and underline the main findings of the application of EMF in bioprocessing and their practical meaning in process engineering using examples selected from studies on bacteria, archaea, microscopic fungi and yeasts, viruses, and microalgae. All biological data are presented concerning the classification of EMF. Furthermore, we aimed to highlight missing parts of contemporary knowledge and indicate weak spots in the approaches found in the literature.

Study of the d+d reactions at very low energies in metallic environments in the terrestrial laboratories, enables us to determine the strength of the screening effect in the strongly coupled astrophysical plasma in stars. So far, experimentally determined screening energies were extremely high in comparison to the theoretical predictions, and the reason for the observed discrepancies remained unrecognized. New measurements of the electron screening effect in 2H(d, p)3H and 2H(d,n)3H reactions at energies from 6 to 25 keV were performed in zirconium under ultra-high vacuum conditions. The target surface contamination and the deuteron density have been continuously monitored. Precisely determined energy dependence of the screening enhancement factor deviates significantly from the single-parametric curve fitted only with the screening energy. To explain the experimental data it was necessary to include an additional contribution resulting from a hypothetical 0+ threshold resonance in 4He of a single-particle structure. The resonance component could be calculated as a coherent superposition with transition matrix elements for the dd reactions, reducing the value of experimentally obtained screening energy. However, its absolute value still overestimates the theoretical limit and can additionally be influenced by a number of crystal lattice defects of the metallic target.

AbstractThe role of future forests in global biogeochemical cycles will depend on how different tree species respond to climate. Interpreting the response of forest growth to climate change requires an understanding of the temporal and spatial patterns of seasonal climatic influences on the growth of common tree species. We constructed a new network of 310 tree‐ring width chronologies from three common tree species (Quercus robur, Pinus sylvestris and Fagus sylvatica) collected for different ecological, management and climate purposes in the south Baltic Sea region at the border of three bioclimatic zones (temperate continental, oceanic, southern boreal). The major climate factors (temperature, precipitation, drought) affecting tree growth at monthly and seasonal scales were identified. Our analysis documents that 20th century Scots pine and deciduous species growth is generally controlled by different climate parameters, and that summer moisture availability is increasingly important for the growth of deciduous species examined. We report changes in the influence of winter climate variables over the last decades, where a decreasing influence of late winter temperature on deciduous tree growth and an increasing influence of winter temperature on Scots pine growth was found. By comparing climate–growth responses for the 1943–1972 and 1973–2002 periods and characterizing site‐level growth response stability, a descriptive application of spatial segregation analysis distinguished sites with stable responses to dominant climate parameters (northeast of the study region), and sites that collectively showed unstable responses to winter climate (southeast of the study region). The findings presented here highlight the temporally unstable and nonuniform responses of tree growth to climate variability, and that there are geographical coherent regions where these changes are similar. Considering continued climate change in the future, our results provide important regional perspectives on recent broad‐scale climate–growth relationships for trees across the temperate to boreal forest transition around the south Baltic Sea.

Artículo de OPINIÓN Front. Sustain., 09 de marzo de 2023Sec. Organizaciones Sostenibles Volumen 4 - 2023 | https://doi.org/10.3389/frsus.2023.1148499 Article d'OPINION Front. Sustain., 09 mars 2023Sec. Sustainable Organizations Volume 4 - 2023 | https://doi.org/10.3389/frsus.2023.1148499 OPINION article Front. Sustain., 09 March 2023Sec. Sustainable Organizations Volume 4 - 2023 | https://doi.org/10.3389/frsus.2023.1148499 مقالة رأي مقدمة الاستدامة، 09 مارس 2023 م. المنظمات المستدامة المجلد 4 - 2023 | https://doi.org/10.3389/frsus.2023.1148499

The creative industries are recognized as one of the most perspective sectors of the economy with high potential to both contribute to local and regional prosperity and employment generation. Globally, the cultural and creative industries (CCIs, or culture and creative sector) became a large part of the economy in the first decade of the 21st century. They made a 3% contribution to the global economy. They generate US $2250 billion and create 29.5 million jobs worldwide. In parallel to economic benefits, the cultural and creative sectors also deliver benefits to people. They foster sustainable urban development, creativity, and culture. Furthermore, they support the implementation of the 2030 Agenda. Creativity and culture also have significant intangible value. They promote social inclusion and encourage dialogue and understanding between people. Culture is both a driver and an enabler of sustainable human development. It empowers people to take responsibility for their own development and boosts innovation and creativity, which can drive inclusive and sustainable development. The presence of CCI in a particular area is an important factor of competitiveness, image, and economic development. This paper presents the results of a study on the determinants of the development of creative industries in the Baltic Sea Region. The summary of the main results of the study focuses on the economic importance, innovation in creative enterprises, and the needs of organizations to grow. It shows that creative industries, which are characterized by rather small entities and elastic work organizations, acquire new ideas and approaches primarily through the mobility of independent employees. Since creative industries make a decisive contribution to the competitiveness of the national innovation system and enhance sustainable growth at the same time, it concludes with implications and challenges for regional innovation policies to improve the framework conditions for creative industries. This article presents the conclusions of research that was conducted in four countries of the Baltic Sea Region (Germany, Sweden, Lithuania, and Poland). The research was conducted by using a Computer Assisted Web Interview (CAWI) survey. A total of 682 correctly completed questionnaires were obtained. The results were subjected to statistical inference, in which the technique of detecting hidden interdependencies between the examined phenomena using the V-Cramer method was also applied. The main aim of this article is to verify the state of the creative industry in the Baltic Sea Region. And the research hypothesis is that the organizations of creative sectors are doing well in turbulent circumstances, and, by doing so, they continually enhance the realization of sustainability goals.

This study presents the design and computational fluid dynamics (CFD) analysis of a mini demonstrator for a dual fluid reactor (DFR). The DFR is a novel concept currently under investigation. The DFR is characterized by the implementation of two distinct liquid loops dedicated to fuel and coolant. It integrates the principles of molten salt reactors and liquid metal cooled reactors; thus, it operates in a high temperature and fast neutron spectrum, presenting a distinct approach in the field of advanced nuclear reactor design. The mini demonstrator serves as a scaled-down version of the actual reactor, primarily aimed at gaining insights into the CFD analysis intricacies of the reactor while minimizing computational costs. The CFD modeling of the MD intends to add valuable data for the purpose of modeling validation against experiments to be conducted on the MD. These experiments can be used for DFR licensing and design optimization. The coolant and fuel utilized in the mini demonstrator are of low Prandtl number (Pr = 0.01) liquid lead, operating at two distinct inlet temperatures, namely 873 K and 1473 K. The study showed a rapid increase in turbulence due to intense mixing and abrupt changes in flow areas and directions, despite the relatively low inlet velocities. Hot spots characterized by elevated temperatures were identified, analyzed, and justified based on their spatial distribution and flow conditions. Flow swirling within pipes was identified and a remedy approach was suggested. Inconsistent mass flow rates were observed among the fuel pipes, with higher rates observed in the lateral pipes. Although lower fuel temperatures were observed in the lateral pipes, they consistently exhibited higher heat exchange characteristics. The study concludes by giving physical insights into the heat transfer and flow behavior, and proposing design considerations for the dual fluid reactor to enhance structural safety and durability, based on the preliminary analysis conducted.

The energy returned on invested, EROI, has been evaluated for typical power plants representing wind energy, photovoltaics, solar thermal, hydro, natural gas, biogas, coal and nuclear power. The strict exergy concept with no “primary energy weighting”, updated material databases, and updated technical procedures make it possible to directly compare the overall efficiency of those power plants on a uniform mathematical and physical basis. Pump storage systems, needed for solar and wind energy, have been included in the EROI so that the efficiency can be compared with an “unbuffered” scenario. The results show that nuclear, hydro, coal, and natural gas power systems (in this order) are one order of magnitude more effective than photovoltaics and wind power.

Climate change affects timing of reproduction in many bird species, but few studies have investigated its influence on annual reproductive output. Here, we assess changes in the annual production of young by female breeders in 201 populations of 104 bird species (N = 745,962 clutches) covering all continents between 1970 and 2019. Overall, average offspring production has declined in recent decades, but considerable differences were found among species and populations. A total of 56.7% of populations showed a declining trend in offspring production (significant in 17.4%), whereas 43.3% exhibited an increase (significant in 10.4%). The results show that climatic changes affect offspring production through compounded effects on ecological and life history traits of species. Migratory and larger-bodied species experienced reduced offspring production with increasing temperatures during the chick-rearing period, whereas smaller-bodied, sedentary species tended to produce more offspring. Likewise, multi-brooded species showed increased breeding success with increasing temperatures, whereas rising temperatures were unrelated to reproductive success in single-brooded species. Our study suggests that rapid declines in size of bird populations reported by many studies from different parts of the world are driven only to a small degree by changes in the production of young.