emaglem A magnificent starry night at #MountFuji from Lake Motosu, #Japan. How many shooting stars do you see?
понедельник, 23 октября 2017 г.
emaglem A magnificent starry night at #MountFuji from Lake…
Helicopter overflight of Santorini Caldera, Greece – faulted…
Helicopter overflight of Santorini Caldera, Greece – faulted caldera rim visible in the distance.
Important breakthrough: scientists managed to create atomically thin oxide layers using liquid metal.
Thin oxide layers are essential for modern electronics. They are used in transistors and even in touch screens. The thinner the oxide, the less energy is wasted and the faster response of the device is. However, making thin oxide layers is really difficult because they do not like being removed…
Scientists reach milestone in 3-D laser writing in bulk…
Scientists reach milestone in 3-D laser writing in bulk silicon
It has taken more than 20 years, but researchers have demonstrated for the first time that femtosecond lasers can be used to structurally manipulate bulk silicon for high-precision applications. Since the late ‘90s, researchers have been using the ultrashort pulses of femtosecond lasers to write into bulk materials with wide band gaps, which are typically insulators. But until now, precise ultrafast laser writing has not been possible for materials with narrow band gaps, such as silicon and other semiconductors.
The researchers expect that the results will open the doors to 3D laser writing for silicon photonics applications, as well as for studying new physics in semiconductors.
The scientists, Margaux Chanal et al., from institutes in France, Qatar, Russia, and Greece, have published their paper “Crossing the threshold of ultrafast laser writing in bulk silicon” in a recent issue of Nature Communications.
In previous attempts at ultrafast laser writing in bulk silicon, scientists found that femtosecond lasers simply weren’t capable of structurally manipulating the bulk silicon, even when the laser energy was increased to the highest pulse intensity technologically possible.
Towel End, Islamic ArtMedium: Linen, silk, metal wrapped thread;…
Towel End, Islamic Art
Medium: Linen, silk, metal wrapped thread; plain weave, embroidered
Anonymous Gift, 1879
Metropolitan Museum of Art, New York, NY
http://www.metmuseum.org/art/collection/search/443063
Intense star formation in the Westerhout 43 region | ESA -…
Intense star formation in the Westerhout 43 region | ESA – European Space Agency
Credit: ESA/Herschel/PACS, SPIRE/Hi-GAL Project. Acknowledgement: UNIMAP / L. Piazzo, La Sapienza – Università di Roma; E. Schisano / G. Li Causi, IAPS/INAF, Italy
Hidden from our sight, the Westerhout 43 star-forming region is revealed in full glory in this far-infrared image from ESA’s Herschel space observatory. This giant cloud, with more than seven million stars, is home to over 20 stellar nurseries, which are being heated by the powerful light from newborn stars within.
See more here.
met-medieval-art: Foot of a Vessel, Medieval ArtMedium:…
Foot of a Vessel, Medieval Art
Medium: Glass
Gift of Clarence H. Mackay, Archer M. Huntington, Stephen H. P. Pell and Bashford Dean, 1928
Metropolitan Museum of Art, New York, NY
http://www.metmuseum.org/art/collection/search/26495
Spouted jar with a frieze of ibexes, Ancient Near Eastern…
Spouted jar with a frieze of ibexes, Ancient Near Eastern Art
Medium: Ceramic, paint
Gift of Ernest Erickson Foundation, 1988
Metropolitan Museum of Art, New York, NY
http://www.metmuseum.org/art/collection/search/327358
Огненный закат США 22 октября 2017
Огненный закат над Денвером, штат Колорадо, США. Вечер 22 октября 2017 года.
Благодарим Фобос. Катаклизмы и катастрофы природы
Ferroelectric self-assembled molecular materialsProfessor…
Ferroelectric self-assembled molecular materials
Professor Martijn Kemerink of Linköping University has worked with colleagues in Spain and the Netherlands to develop the first material with conductivity properties that can be switched on and off using ferroelectric polarisation.
The phenomenon can be used for small and flexible digital memories of the future, and for completely new types of solar cells.
In an article published in the prestigious scientific journal Science Advances, the research group shows the phenomenon in action in three specially built molecules, and proposes a model for how it works.
“I originally had the idea many years ago, and then I just happened to meet Professor David González-Rodríguez, from the Universidad Autónoma de Madrid, who had constructed a molecule of exactly the type we were looking for,” says Martijn Kemerink.
The organic molecules that the researchers have built conduct electricity and contain dipoles. A dipole has one end with a positive charge and one with a negative charge, and changes its orientation (switches) depending on the voltage applied to it. In a thin film of the newly developed molecules, all the dipoles can be caused to switch at exactly the same time, which means that the film changes its polarisation. The property is known as ferroelectricity. In this case, it also leads to a change in the conductivity, from low to high or vice versa. When an electrical field with the opposite polarity is applied, the dipoles again switch direction. The polarisation changes, as does the ability to conduct current.
Zirconium: Did you know?
materialsscienceandengineering:
Though technically only three of zirconium’s five naturally occurring isotopes are stable, most consider there to be four stable isotopes. The half-life of zirconium-94 is so long that it might as well be considered stable.
Заснеженный пейзаж в коммуне Матон Тироль, Австрия, 23.10.2017
Заснеженный пейзаж в коммуне Матон Тироль, Австрия, 23.10.2017
Благодарим Фобос. Катаклизмы и катастрофы природы
Лентикулярные облака США Невада 22.10.2017
Лентикулярные облака рядом с городом Элко США, Невада, 22.10.2017
Активность вулкана Попокатепетль Мексика, 22 октября 2017
Активность вулкана Попокатепетль Мексика, 22 октября 2017
Благодарим Фобос. Катаклизмы и катастрофы природы
Активность вулкана Попокатепетль Мексика, 22 октября 2017
Активность вулкана Попокатепетль Мексика, 22 октября 2017
Благодарим Фобос. Катаклизмы и катастрофы природы
Грозы 22 и 23 октября 2017 Италия Хорватия
22 октября 2017 на северо-востоке Италии
Метеодневник
Интенсивные грозы в ночь на 23 октября 2017 на западе Хорватии.
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