Search Results (1,340)

The currently used electrical energy devices for portable applications are in limited life and need of frequent recharging, it is a big bottleneck for wireless and transportation systems. The scientific community is motivated to find innovative and efficient devices to convert environmental energy into useful forms. Nanogenerator can mitigate this issue by harvesting ambient energy of different forms into useful electrical energy. Particularly flexible nanogenerators can efficiently convert ambient mechanical energy into electrical energy which can be fruitfully used for self-powered sensors and electronic appliances. Zinc oxide is an interesting photosensitive and piezoelectric material that is expected to play a vital role in the synergetic harvesting of environmental thermal, sound, mechanical, and solar energies. As ZnO can be synthesized using easy methods and materials at low cost, the conversion efficiencies of solar and other energy forms can increase considerably. ZnO is a versatile material with interesting semiconducting, optical, and piezoelectric properties; it can be used advantageously to harvest more than one type of ambient energy. The coupled semiconducting and piezoelectric properties of ZnO are attractive for fabricating nanogenerators capable of harvesting both ambient optical and mechanical energies simultaneously. These nanolevel conversion devices are much required to power remote and implantable devices without the need for additional power sources. The present review briefly discusses the principles and mechanisms of different energy harvesting abilities of ZnO nanorods and their composites by consolidating available literature. In addition, the developments taking place in nanogenerators of different kinds—such as photovoltaic, piezoelectric, pyroelectric, and triboelectrics for self-powered technology—and their progress in hybrid energy harvesting application is reviewed. Full article

In Cuba, coastal zone management is a matter of environmental priority. The Cuban State has legislated its protection mechanisms, actions, and instruments according to a high-hierarchical-rank legal norm. This article revealed the institutional frameworks and implementation strategies that support the socio-ecosystemic approach in coastal marine governance in the southeastern region of Santiago de Cuba, focusing on the management practices of integrated coastal zone management (ICZM) programs. Under the logic of ICZM principles, a scientometric, exegetical–legal study was carried out, with thematic content analysis, using the Driving Forces–Pressures–State–Impacts–Respond (DPSIR) framework. The methodology to meet the objectives was based on three analytical stages that generated scientific proposals for implementing the socio-ecosystemic approach in adaptive coastal governance practices. As a result, it is demonstrated that this approach has a scientific and legal proposal in Cuba, and its dynamics in coastal management programs are revealed. This study indicates that the logic of the DPSIR framework provides a propositional platform that helps structure the fundamentals of the proposed approach with reference to objectives and responses of coastal marine governance in Cuba. Full article

Sustainability in food production is a pressing priority due to environmental and political crises, the need for long-term food security, and feeding the populace. Food producers need to increasingly adopt sustainable practices to reduce negative environmental impacts and food waste. The ocean is a source for sustainable food systems; deforestation, water scarcity, and greenhouse gas emissions burden traditional, terrestrial resources. Our oceans contain the largest unexploited resource in the world in the form of mesopelagic fish species, with an estimated biomass of 10 billion metric tons. This resource is largely untapped due in part to the difficulties in harvesting these species. To ensure sustainability of this resource, management of fish stocks and fish processing practices must be optimised. Generation of fish protein hydrolysates from by-catch/underutilised species creates high-value, functional ingredients while also reducing waste. Marine hydrolysates offer a renewable source of nutrition and align with the principles of the circular economy, where waste is minimised and resources are reused efficiently. Ocean-derived solutions demand fewer inputs, generate less pollution, and have a smaller carbon footprint compared to traditional agriculture. This review collates clearly and succinctly the current and potential uses of FPHs for different market sectors and highlights the advantages of their use in terms of the scientifically validated health benefits for humans and animals and fish, and the protection and crop yield benefits that are documented to date from scientific studies. Full article

This review article provides a comprehensive analysis of the photonic sintering conditions necessary to process non-oxide ceramics, to obtain similar material properties when compared with those of thermally annealed ones, for various applications in printed electronics. This article presents a thorough examination of the scientific literature on this topic, discussing the principles of photonic sintering applied to non-oxide ceramics, its advantages over traditional post-processing methods, and a quantitative overview of the performance of devices fabricated with the crystalline materials obtained. Full article

Recognizing that traditional science education materials often overlook students’ cultural and social contexts, this research examines the teacher-driven design of science teaching enactment—specifically, how teachers reflect on and adapt their science instruction to teach social justice through pursuits of identity and criticality using a framework rooted in cultural and historical responsive practices. The data for this study were collected from 14 online discussion sessions where three experienced science teachers engaged in adapting existing lessons, reflecting on their practice toward developing their own understandings of social justice. Through qualitative analysis of the teachers’ reflections, this study investigates how teachers think together about incorporating and nurturing students’ identities and criticality perspectives. The findings show themes related to challenges teachers faced, including parents’ concerns about addressing social justice topics in science class. Teachers also struggled with navigating discussions about identity, particularly when their race differed from that of their students. The teachers also reflected on aspects that promoted the work, such as students’ positive responses, and the deepening of their relationships with students. The teachers’ adaptations centered on students’ identities and the critical examination of societal issues, which were seen as accessible avenues for deepening scientific understanding and promoting engagement. Implications for teachers include using a reflective discussion approach for supporting curricular adaptations. There is a need for professional learning frameworks that empower teachers as agentive, intellectual actors to align science education with social justice principles. This will foster more inclusive and transformative learning experiences for diverse student populations. Full article

This work reviews the use of biodiesel synthesis experiments in science education, emphasising their potential for explicit nature of science (NOS) teaching. Through a literature review and experimental insights, it highlights how transesterification of waste cooking oil (WCO) with a basic catalyst can serve as an educational tool. While biodiesel reaction conditions are well-documented, this study presents them in a pedagogical context. Simple viscosity and density measurements illustrate empirical analysis, while a design of experiments (DoE) approach using a Hadamard matrix introduces systematic optimisation and scientific reasoning. By integrating biodiesel synthesis with explicit NOS instruction, this work provides educators with a framework to foster critical thinking and a deeper understanding of scientific inquiry. Additionally, this approach aligns with green chemistry principles and resource efficiency, reinforcing the broader relevance of sustainable chemistry. Full article

With the development of railway transportation, diversified demands for track structures require the design methods to be safer, more flexible and efficient. At present, the limit state method is regarded as a more scientific design method compared to the allowable stress method, but its optimization effects await further research. Taking a new type of prefabricated track slab as an example, the differences between the two methods are deeply analyzed using finite element simulation and formula calculation. The development prospect for the track design methods is proposed, providing reference for new structures. The results show the following: (1) There are significant differences in the calculation principles between the two methods. Unlike the single safety factor K of the allowable stress method, the partial factors of the limit state method make it more reasonable. (2) The working conditions of different train speeds and temperature gradients are the main factors influencing the design results, and the latter plays a main control role. (3) Under current specification, the reinforcement and slab thickness can be reduced by approximately 6.5% and 3.4%, respectively, according to the limit state method, but the values its coefficient still need to be studied further to achieve efficiency. Full article

This research conducts a comparative life cycle assessment (LCA) to examine both the ecological footprint and microbiological performance of eco-friendly and traditional cleaning methods in non-clinical environments. Conducted in accordance with the updated Minimum Environmental Criteria (CAMs), the research follows the principles and framework established by UNI EN ISO 14040 and 14044. Additionally, the assessment of carbon footprint (kg CO₂e) adheres to ISO 14067:2018, with guidance from Product Category Rules (PCR 2011:03 v3.0.1). Our findings demonstrate that the Green Protocol implemented by Dussmann Service reduces the carbon footprint of cleaning activities by 20.0% compared to the traditional protocol, equating to an annual reduction of 156 kg CO₂ at the pilot site. Laboratory analyses confirm that the Green Protocol maintains hygiene standards equivalent to conventional methods, ensuring adequate microbiological quality while significantly lowering environmental impact. The study highlights the feasibility of integrating eco-friendly cleaning practices without compromising effectiveness. Future research should explore the scalability, cost-efficiency, and long-term benefits of this approach. This assessment provides a scientifically validated foundation for adopting sustainable cleaning methodologies in professional settings, supporting the transition towards environmentally responsible facility management. Full article

The results of geotourism development in Slovakia do not correspond much to the idea of geotourism as a social priority, nor to the declared increased interest in all forms of responsible tourism. The development of geotourism, in the strict sense of the word, is a political phenomenon; here, it exists outside the legal framework. This paper examines the question of whether, to what extent, and in what manner the promotion of leading principles (such as the idea of sustainability and its manifestation in various forms of regulated tourism) should be enshrined in positive law, and what specific benefits this might bring for the development of geotourism in Slovakia. Given the questions posed are of a kind that jurisprudence may answer, the methods chosen are drawn from legal science, though also intersecting with several other social sciences. Accordingly, the approach is one of doctrinal interpretation, based on the scientific study of valid law. Slovak law as a whole, specifically as it relates to the implementation of sustainable development and regulated forms of tourism, thus sets the outer limits of the application of these interpretative methods (including linguistic, historical, and logical interpretation of law, among others). The article answers the question in the affirmative way and outlines prospects for positive change should current approaches be changed. Full article

A holistic scientific measurement of the internet traffic across all devices in Germany has quantified the extreme extent of digital monopolization. Due to the high level of concentration, provider pluralism and fair competition in the field of digital media have been systematically and intentionally abolished. As a result of the digital transformation, it can be assumed that the GAFA (the known acronym for Google, i.e., Alphabet, Amazon, Facebook, i.e., Meta, Apple) players will take control of the German media system in the coming years (due to comparable market structures, the situation will be similar in other Western democracies). From a German and a European perspective, it is the more alarming that this development can hardly be stopped on the basis of existing legislation. However, already the status quo is in striking contradiction to the anti-monopolistic principles of classic German media law. It is time for a fundamental debate and quick legislative actions to open the media markets again for competition and plurality and safeguard media freedom for the future. Full article

This article introduces a novel hybrid database architecture that combines graph and time-series databases to enhance the storage and management of transportation data, particularly for electric vehicles (EVs). This model addresses a critical challenge in modern mobility: handling large-scale, high-velocity, and highly interconnected datasets while maintaining query efficiency and scalability. By comparing a naive graph-only approach with our hybrid solution, we demonstrate a significant reduction in query response times for large data contexts-up to 64% faster in the XL scenario. The scientific contribution of this research lies in its practical implementation of a dual-layer storage framework that aligns with FAIR data principles and real-time mobility needs. Moreover, the hybrid model supports complex analytics, such as EV battery health monitoring, dynamic route optimization, and charging behavior analysis. These capabilities offer a multiplier effect, enabling broader applications across urban mobility systems, fleet management platforms, and energy-aware transport planning. By explicitly considering the interconnected nature of transport and energy data, this work contributes to both carbon emission reduction and smart city efficiency on a global scale. Full article

The Schrödinger equation, Heisenberg’s uncertainty principles, and the Boltzmann constant represent transformative scientific achievements, the impacts of which extend far beyond their original domain of physics. As we celebrate the centenary of these fundamental quantum mechanical formulations, this review examines their evolution from abstract mathematical concepts to essential tools in contemporary drug discovery and development. While these principles describe the behavior of subatomic particles and molecules at the quantum level, they have profound implications for understanding biological processes such as enzyme catalysis, receptor–ligand interactions, and drug–target binding. Quantum tunneling, a direct consequence of these principles, explains how some reactions occur despite classical energy barriers, enabling novel therapeutic approaches for previously untreatable diseases. This understanding of quantum mechanics from 100 years ago is now creating innovative approaches to drug discovery with diverse prospects, as explored in this review. However, the fact that the quantum phenomenon can be described but never understood places us in a conundrum with both philosophical and ethical implications; a prospective and inconclusive discussion of these aspects is added to ensure the incompleteness of the paradigm remains unshifted. Full article

Expanding the range of healthy food products is one of the most promising areas in the field of food science. In recent years, there has been an active development of the global trend of functional nutrition aimed at strengthening general health, as well as preventing common non-communicable diseases and metabolic disorders. Chocolate, occupying a leading position among confectionery products, continues to demonstrate a steady growth in consumption on a global scale, which is due to its unique taste and sensory and functional properties. Modern trends in the food industry are aimed at further improving the composition and properties of chocolate, which makes it a promising object for scientific research and innovative developments. This review is devoted to the systematization and study of modern research aimed at developing functional types of chocolate that meet the principles of healthy nutrition. The paper considers the potential of bioactive components, such as polyphenols, probiotics, prebiotic components, dietary fiber, polyunsaturated fatty acids, and plant extracts, for use in the functionalization of chocolate. These compounds have pronounced antioxidant, anti-inflammatory, antimicrobial, and cardioprotective properties. Particular attention is paid to the role of bioactive components of cocoa and chocolate in the prevention of chronic non-communicable diseases, strengthening the cardiovascular system, improving cognitive functions, and normalizing the composition of intestinal microbiota. In addition, promising areas in the field of production technologies and innovative solutions aimed at creating functional types of chocolate with improved consumer properties are considered. The relevance of these developments is due to the growing demand for food products that combine high taste qualities and functionality, which opens up new opportunities for health-oriented nutrition. Full article

The Mediterranean Diet (MD), although not always called by this name, has emerged over centuries as a diet influenced by diverse civilizations in the Mediterranean region, who blended local produce, traditions, and rituals with new ingredients and customs introduced through trade, migrations, or occupations. Historically characterized mainly by plant-based foods, olive oil, fish, moderate meat consumption, and moderate wine consumption, MD was also shaped by the holistic health principles advocated by figures like Hippocrates, Plato and Galen. Modern investigations, including Ancel Keys’ Seven Countries Study, confirmed its protective role against cardiovascular disease and other chronic illnesses, while UNESCO’s designation of the MD as an Intangible Cultural Heritage highlights its broader cultural significance. Today, although MD faces challenges from globalization and shifts in modern lifestyles, the advances in personalized and AI-driven nutrition, as well as specific public health initiatives offer opportunities to preserve its core tenets of balance, sustainability, and communal eating for future generations along with many scientifically proven benefits of this diet and the associated lifestyle. Full article

Chemical food safety is a fundamental pillar of public health, regulatory governance, and economic stability, with far-reaching implications for human, animal, and environmental well-being. In the matter of chemicals in the food chain, the European Union (EU) has established one of the most sophisticated and robust regulatory frameworks to ensure food safety and balance consumer protection with scientific advancements and industry needs. This review provides a holistic analysis of the EU chemical food safety scenario, examining its regulatory framework, key risk assessment methodologies, and the roles of critical institutions involved in monitoring, enforcement, and policymaking. The new and evolving challenges of chemical food safety, including transparency, cumulative risk assessment, and emerging contaminants, were discussed. Special attention is given to major classes of chemical substances in food, their regulatory oversight, and the scientific principles guiding their assessment, as well as to the role of key actors, including regulatory agencies, official laboratories, and competent authorities. This work offers an updated and integrated analysis of chemical food safety in the EU, uniquely combining regulatory, scientific, and enforcement perspectives and providing a structured roadmap for future directions. Full article