Cost modelling of floating wind farms with upscaled rotors in Maltese waters

The technical viability of offshore wind projects depends upon a number of factors such as the site-specific wind resource, sea depth, seabed composition, distance to the shore and climatic conditions amongst others. The Mediterranean is characterised by deep seas relatively close to the shore and only a reasonable wind climate if compared to conditions in countries that are forerunners in the offshore wind sector. The development of floating wind turbine support structures will allow wind farms in deeper waters and will be a catalyst for the wider diffusion and larger-scale implementation of offshore wind farms on a global level. This study investigates the prospects for a hypothetical 100 MW floating offshore wind farm well to the west of the island of Malta. The study models three upscaled turbines having rotor diameters of 126, 145 and 170 m. The study shows that the rotor upscaling process can improve the economic viability of offshore wind turbines with the improved energy yield counterbalancing the higher investment costs required for such a project and thus resulting in a lower cost of energy. The levelised cost of electricity is estimated to be in the 21.0 to 23.6 €cent/kWh range which, although still well above the current market prices of electricity generated by conventional means, is expected to drop considerably over the coming years as new international players enter the offshore wind market. Increasing levels of competition, new concepts coming to fruition and wider and larger-scale diffusion of new technologies will help bring down costs of energy for the offshore wind farms of the future.Bajada New Energy, General Membrane, EcoGroup, Econetique, Energy Investment, JMV Vibro Blocks, Solar Engineering, Solar Solutionspeer-reviewe

Safety and efficacy of the feed additive Anpro consisting of a mixture of Sepiolite and Kieselguhr (diatomaceous earth) for all terrestrial animal species (Anpario plc)

Free PMC article: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10733796/Following a request from the European Commission, EFSA was asked to deliver a scientific opinion on the safety and efficacy of the mixture of Sepiolite and Kieselguhr (diatomaceous earth) (Anpro) as a technological feed additive for all terrestrial animal species. According to the conventional risk assessment, due to lack of adequate data, the safety of the additive Anpro for the target species cannot be established. Based on current knowledge, there is no indication of substantial absorption of the components of the additive and therefore no concern for the consumer. The additive poses a risk by inhalation. It is not irritant to the skin or eyes but should be considered as skin sensitiser. As no suitable data in line with the requirements of the Guidance on risk assessment of nanomaterials were provided by the applicant, the potential risks associated with the presence of nanoparticles could not be assessed for the target species, the consumer and the user. The additive is safe for the environment. The FEEDAP Panel is not in the position to conclude on the efficacy of the additive for all terrestrial animal species.info:eu-repo/semantics/publishedVersio

Manipulating the flow of thermal noise in quantum devices

There has been significant interest recently in using complex quantum systems to create effective nonreciprocal dynamics. Proposals have been put forward for the realization of artificial magnetic fields for photons and phonons; experimental progress is fast making these proposals a reality. Much work has concentrated on the use of such systems for controlling the flow of signals, e.g., to create isolators or directional amplifiers for optical signals. In this Letter, we build on this work but move in a different direction. We develop the theory of and discuss a potential realization for the controllable flow of thermal noise in quantum systems. We demonstrate theoretically that the unidirectional flow of thermal noise is possible within quantum cascaded systems. Viewing an optomechanical platform as a cascaded system we show here that one can ultimately control the direction of the flow of thermal noise. By appropriately engineering the mechanical resonator, which acts as an artificial reservoir, the flow of thermal noise can be constrained to a desired direction, yielding a thermal rectifier. The proposed quantum thermal noise rectifier could potentially be used to develop devices such as a thermal modulator, a thermal router, and a thermal amplifier for nanoelectronic devices and superconducting circuits

An empirical study of the determinants of self-employment in developing countries

Official statistics record a tremendous diversity in the level and dynamics of the self-employment rate across countries. Such diversity is even more pronounced for developing countries than for industrial countries. In these countries, self-employment figures may represent evidence of the spark of an emerging entrepreneurial class still in its infant stages, or conceal marginal urban manufacturing employment at the mere level of subsistence and disguising actual unemployment in years of economic depression. This paper documents this diversity for developing and developed countries with new empirical evidence, and tests the determinants of this diversity with econometric techniques. Estimates are presented on a sample of 64 developing countries and 19 developed countries in a period from the 1960s through the 1990s. The results generally confirm a negative association between the rate of self-employment and the stage of development: self-employment would tend to disappear with the development process. However, we present evidence suggesting that in some cases self-employment is also related to high value-added manufactured exports, representing a dynamic and emerging form of entrepreneurship. To this aim, self-employment would not be motivated by the desire to evade taxes, but rather an active role of the government may enhance it. The relationships with the development of the financial sector, educational levels, and other cultural factors tend to vary. Copyright © 2004 John Wiley & Sons, Ltd.