Results 21 to 30 of about 71,749,598 (257)
Acta Scientiarum Polonorum. Formatio Circumiectus, 2020 Aim of the study: The paper presents the results of research carried out in the Będkówka stream. The aim of study was to determine the influence of large roughness elements on the change in the coefficient of roughness and resistance coefficients ...
Bogusław Michalec, Monika Zwolenik
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Micromachines, 2022 Complex surfaces such as helical ones are commonly used in machinery. Such surfaces can be obtained by various machining processes, one of these processes being thread whirling.
Vasile Merticaru +6 more
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Italian National Conference on Sensors, 2020 Globalization has increased the number of road trips and vehicles. The result has been an intensification of traffic accidents, which are becoming one of the most important causes of death worldwide.
V. C. Magaña +5 more
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Explicit Conditions on Existence and Uniqueness of Load-Flow Solutions in Distribution Networks [PDF]
IEEE Transactions on Smart Grid, 2016 We present explicit sufficient conditions that guarantee the existence and uniqueness of the load-flow solution for distribution networks with a generic topology (radial or meshed) modeled with positive sequence equivalents.
Cong Wang +3 more
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Positive elements and theB * condition
Mathematische Zeitschrift, 1986 The basic theory of the ''positive elements'' of a \(B^*\)-algebra is derived from the \(B^*\) condition by a combination of totally elementary argument, the spectral radius formula and the square root lemma. In the process a sort of ''topological norm additivity'' emerges for positive elements.
Harte, Robin, Searcóid, Micheál ó
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Light elements in the Earth’s core
Nature Reviews Earth & Environment, 2021 Constraining the core’s composition is essential for understanding Earth accretion, core formation and the sustainment of Earth’s magnetic field. Earth’s outer and inner core exhibit a density deficit relative to pure iron, attributed to the presence of ...
K. Hirose, B. Wood, L. Vočadlo
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Data on rare earth elements in mining environments under non-acidic conditions
Data in Brief, 2019 This article contains analytical data on Rare Earth Elements (REE) concentration in waters and solid samples (mining wastes and biominerals) collected in an abandoned mining site characterized by near-neutral conditions, and they are related with the ...
Daniela Medas +3 more
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Al-Qadisiyah Journal for Engineering Science, 2020 The major goal of the presented study is to study the Reverse Osmosis (RO) characteristics for (Cd, U, Pb, Cu, Zn, K, Th, and Ni) removal from an aqueous solution containing Phosphogypsum.
Waleed T. Rashid a +2 more
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Energies, 2021 Coal-fired power units, now balancing power shortages in the power system, must be characterised by increasingly higher flexibility of operation. This means faster start-ups and the capacity for frequent decreases and increases in the power output. These
Andrzej Rusin +4 more
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Leaching of rare earth elements from phosphogypsum.
Chemosphere, 2022 High amounts of phosphogypsum (PG) are generated in the production of phosphoric acid. Previous literature demonstrates that obtaining rare earth elements (REE) from PG is a promising alternative to managing this waste.
Sabrina F. Lütke +6 more
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