Science | WPN World People News

Like cosmic ballet dancers, the stars of the Pleiades cluster are spinning. But these celestial dancers are all twirling at different speeds. Astronomers have long wondered what determines the rotation rates of these stars.

The research, funded by the U.S. Department of Energy SunShot Initiative, involved hybrid halide perovskite solar cells and revealed treating them with a specific solution of methyl ammonium bromide (MABr) would repair defects, improving efficiency. The scientists converted a low-quality perovskite film with pinholes and small grains into a high-quality film without pinholes and with large grains. Doing so boosted the efficiency of the perovskite film in converting sunlight to 19 percent.

These variations in humidity and temperature are translated into physical processes involving evaporation or freezing of the water contained in the cement paste, which often cause stresses and even micro-cracking inside the cement. Characterizing the response to these phenomena affecting the confined water in the smallest pores of the cement "is hugely important as a large proportion of the water, about 30 %, is located in these small spaces, so to a great extent it contributes towards the final properties of the material," explained Hegoi Manzano, a researcher in the UPV/EHU's department of Condensed Matter Physics, and author of the study in collaboration with a research group of the University of Tohoku in Japan.

Researchers from MIT and MIT Lincoln Laboratory report an important step toward practical quantum computers, with a paper describing a prototype chip that can trap ions in an electric field and, with built-in optics, direct laser light toward each of them.

Lithium ions migrate through the electrolyte (yellow) into the layer of crystalline silicon (c-Si). During the charging cycle, a 20-nm layer (red) develops on the silicon electrode adsorbing extreme quantities of lithium atoms.

Rice University researchers used computer models of concrete's inner matrix to show how tiny holes filled with portlandite (blue) impart strength and toughness by preventing the spread of cracks.

Artistic image of light trapped on the surface of a nanoparticle topological insulator.

NASA Charges Toward Greener Aviation With Novel Concepts.

The images show PET scans of a mouse with a large tumor (by the white arrow). The tumor is treated with nanoparticles, which are injected directly into the tumor and are then flashed with near infrared laser light. The laser light heats the nanoparticles, thus damaging or killing the cancer cells (red arrows).

U.S. coastal areas where freshwater and seawater mix unseen below ground, making them vulnerable to ocean and/or drinking water contamination. Dark blue areas are vulnerable to land-to-sea pollution; pink to sea-to-land pollution; light blue to both. Areas may appear larger for visibility purposes.