Hasil untuk "physics.soc-ph"

I. Booth

A. Airapetian, V. Dodonov, L. Micu et al.

A. Dautry‐Varsat, A. Ciechanover, H. Lodish

M. Högberg, P. Högberg, D. Myrold

S. Kemmitt, D. Wright, K. Goulding et al.

S. Dai, P. Ravi, K. Tam

Huan Meng, Min Xue, T. Xia et al.

M. Kosmulski

Kejin Zhou, Yiguang Wang, Xiaonan Huang et al.

Osvaldo L. Santos-Pereira

This work discusses the concept of roulette, the generated curves that occur when one curve rolls without slipping along another, tracing the path of a fixed point. The coin paradox and Aristotle's wheel paradox are used as pedagogical motivations to discuss the parametric equations of epicycloids and hypocycloids, providing a geometrical intuition for the mathematical derivations and computational implementation of those curves. Python code is provided to motivate the application of the derived parametric equations, resulting in concrete visualizations and animations.

Wen Shi, Xiaohua Li, Huimin Ma

J. Aschenbach, G. Penner, F. Stumpff et al.

Hajem Bataineh, Oleg Pestovsky, A. Bakac

G. Elmasry, Da‐Wen Sun, P. Allen

Zechen Wu, Yi Zhu, Weiya Huang et al.

Samuel Alpert, Visal Veng, Benard Tabu

Fertilizer manufacturing is an energy-intensive process that is done in a select number of facilities across the world. We performed a literature review of methods that are being pursued in the emerging field of sustainable fertilizer manufacturing and analyzed the results of one such sustainably sourced fertilizer process. The results of our testing on a rooftop garden showed that the production of tomatoes was similar to the control and commercial fertilizer scenarios in that the total weight of tomatoes per plant was 16% higher, and the weight per tomato was 68% more than the control (tap water). We hope that this type of research will continue to be performed and expanded so that we can adopt a more sustainable method of fertilizer manufacturing in our pursuit of net positive environmental benefits.

J. Dijkstra, J. Ellis, E. Kebreab et al.

R. Chaiklahan, N. Chirasuwan, B. Bunnag

Daniel Ambort, M. Johansson, J. Gustafsson et al.

D. Johnson, T. Kanao, S. Hedrich et al.

Many different species of acidophilic prokaryotes, widely distributed within the domains Bacteria and Archaea, can catalyze the dissimilatory oxidation of ferrous iron or reduction of ferric iron, or can do both. Microbially mediated cycling of iron in extremely acidic environments (pH < 3) is strongly influenced by the enhanced chemical stability of ferrous iron and far greater solubility of ferric iron under such conditions. Cycling of iron has been demonstrated in vitro using both pure and mixed cultures of acidophiles, and there is considerable evidence that active cycling of iron occurs in acid mine drainage streams, pit lakes, and iron-rich acidic rivers, such as the Rio Tinto. Measurements of specific rates of iron oxidation and reduction by acidophilic microorganisms show that different species vary in their capacities for iron oxido-reduction, and that this is influenced by the electron donor provided and growth conditions used. These measurements, and comparison with corresponding data for oxidation of reduced sulfur compounds, also help explain why ferrous iron is usually used preferentially as an electron donor by acidophiles that can oxidize both iron and sulfur, even though the energy yield from oxidizing iron is much smaller than that available from sulfur oxidation. Iron-oxidizing acidophiles have been used in biomining (a technology that harness their abilities to accelerate the oxidative dissolution of sulfidic minerals and thereby facilitate the extraction of precious and base metals) for several decades. More recently they have also been used to simultaneously remediate iron-contaminated surface and ground waters and produce a useful mineral by-product (schwertmannite). Bioprocessing of oxidized mineral ores using acidophiles that catalyze the reductive dissolution of ferric iron minerals such as goethite has also recently been demonstrated, and new biomining technologies based on this approach are being developed.