Results 51 to 60 of about 607,170 (281)

X-rays and hard UV radiation From the First Galaxies: Ionization Bubbles and 21 cm Observations

, 2011
The first stars and quasars are known sources of hard ionizing radiation in the first billion years of the Universe. We examine the joint effects of X-rays and hard UV radiation from such first-light sources on the hydrogen and helium reionization of the
Aldrovandi, Andrew Benson, Aparna Venkatesan, Arnaud, Barkana, Benson, Benson, Benson, Benson, Benson, Bolton, Bromm, Bullock, Busha, Chen, Chen, Chiu, Ciardi, Dawson, Dayal, Efstathiou, Furlanetto, Furlanetto, Furlanetto, Furlanetto, Furlanetto, Gardner, Gnedin, Greene, Gültekin, Haardt, Hirata, Hopkins, Kereš, Koposov, Kuhlen, Larson, Loeb, Loeb, Macci, Madau, McQuinn, McQuinn, Meiksin, Morales, Muoz, Navarro, Oh, Onken, Peebles, Pritchard, Quinn, Ricotti, Ricotti, Ripamonti, Santos, Scholz, Seager, Shull, Shull, Sokasian, Somerville, Somerville, Spitzer, Springel, Sutherland, Thomas, Tumlinson, Tumlinson, Tumlinson, Venkatesan, Venkatesan, Verner, Verner, Verner, Voronov, Warszawski, Wise, Wyithe, Zaldarriaga   +79 more
core   +1 more source

Adjustment of Coatings Morphology and Particle Distribution of Layered Silicates by Freeze‐Drying for Improved Gas Barriers

Advanced Engineering Materials, EarlyView.
Freeze‐drying of layered silicate is the key to get coatings with superior gas barrier. Freeze‐drying of layered silicates modified with dodecylamine (DDA) is a highly effective technique for the preparation of barrier pigments that significantly mitigate the permeation of oxygen, water vapor, and hydrogen through polymer films containing these ...
Joshua Lommes, Moritz Bätcher, Andrea Deißenberger, Volkmar Stenzel, Andreas Hartwig   +4 more
wiley   +1 more source

Photoprocesses in protoplanetary disks

, 2006
Circumstellar disks are exposed to intense ultraviolet radiation from the young star. In the inner disks, the UV radiation can be enhanced by more than seven orders of magnitude compared with the average interstellar field, resulting in a physical and ...
Aikawa, Augereau, Bastiaan Jonkheid, Bergin, Brittain, Buenker, Calvet, Chiang, Clampin, Connors, D?Alessio, Dent, Draine, Dunning, Dutrey, Ewine F. van Dishoeck, Feigelson, Geers et al., Gorti, Greaves, Gredel, Guest, Habing, Hauschildt, Herbig, Hollenbach, Honjou, Huebner, Jonkheid, Jonkheid, Kamp, Kamp, Kamp, Kessler-Silacci, Kirby, Kirby, Koch, Koch, Lavendy, Lee, Lee, Lee, Lee, Lee, Lepp, Li, Lyons, Marc C. van Hemert, Markwick, Min, Muzerolle, Nee, Nee, Ogawa, Okabe, Pouilly, R?melt, Roberge, Roberge, Shen, Shih, Spaans, St?uber, St?uber, Suto, Suto, Suto, Suto, Sylvester, Theodorakopoulos, Thi, van Boekel, van Dishoeck, van Dishoeck, van Dishoeck, van Dishoeck, van Dishoeck, van Zadelhoff, Watanabe, Weidenschilling, Willacy, Yoshino   +81 more
core   +1 more source

Variability and the X-ray/UV ratio of Active Galactic Nuclei [PDF]

, 2010
The observed relation between the X-ray radiation from AGNs, originating in the corona, and the optical/UV radiation from the disk is usually described by the anticorrelation between the UV to X-ray slope alpha_ox and the UV luminosity.
Antonucci, M., Trevese, D., Turriziani, S., Vagnetti, F.   +3 more
core   +1 more source

Trace Nickel Activated Biphasic Core‐CuOii/Shell‐CuOi Secondary Microspheres Enable Room Temperature Parts‐Per‐Trillion‐Level NO2 Detection

Advanced Engineering Materials, EarlyView.
An idea of designing novel sensors is proposed by creating appropriate Schottky barriers and vacancies between isomorphous Core‐CuOii/ Shell‐CuOi secondary microspheres and enhancing catalytic and spill‐over effects, and electronegativity via spontaneous biphasic separation, self‐assembly, and trace‐Ni‐doping.
Bala Ismail Adamu, Peipei Chen, Shafia Mukhtar Ibrahim, Mukhtar Lawan Adam, Attia Falak, Mokhotjwa Simon Dhlamini, Hanfu Wang, Lingxiang Jiang, Weiguo Chu   +8 more
wiley   +1 more source

Radiative non-isothermal Bondi accretion onto a massive black hole

, 2019
In this paper, we present the classical Bondi accretion theory for the case of non-isothermal accretion processes onto a supermassive black hole (SMBH), including the effects of X-ray heating and the radiation force due to electron scattering and ...
Contreras, Ernesto, Cruz, F., Gabbasov, R., Klapp, J., Ramirez-Velasquez, J. M., Sigalotti, L. Di G.   +5 more
core   +1 more source

Screen‐Printed Flexible Piezoelectric Force Sensor Array with Electromagnetic Interference Shielding

Advanced Engineering Materials, EarlyView.
This article introduces a flexible screen‐printed piezoelectric sensor array designed for low‐frequency healthcare applications such as tactile sensing and cardiovascular monitoring. The device integrates interface electronics enabling the simultaneous acquisition of up to 128 signals, along with flexible EMI shielding that significantly reduces noise ...
Joseph Faudou, Mohammed Benwadih, Arnaud Gabas, Lina Kadura, Minh‐Quyen Le, Daniel Grinberg, Pierre‐Jean Cottinet   +6 more
wiley   +1 more source

Effects of silicate application on CH4 and N2O emissions and global warming potentials in paddy soil under enhanced UV‐B radiation

Energy Science & Engineering, 2019
Enhanced ultraviolet‐B (UV‐B) radiation is induced by the depletion of the stratospheric ozone layer. Silicate is beneficial to rice growth and can increase the resistance of rice plant to UV‐B radiation, but so far few reports have been available on ...
Yunsheng Lou, Lixuan Ren, Sidi Zhao, Yifan Shi, Yiwei Zhang, Huaiwei Zhu   +5 more
doaj   +1 more source

Influence of an Argon/Silane Atmosphere on the Temperature of a Thermal Plasma

Advanced Engineering Materials, EarlyView.
The influence of a silane‐doped argon atmosphere on the chemical composition and temperature of a thermal nontransferring argon plasma is investigated using optical emission spectroscopy. As a result of the high amount of free electrons resulting from the stepwise ionization and dissociation of the silane molecule, even a silane addition of 0.01 vol ...
Lena Kreie, David Kramer, Thomas Scheithauer, Hans Jürgen Maier, Thomas Hassel   +4 more
wiley   +1 more source

Effect of solar and artificial UV radiation on photosynthetic performance and carbonic anhydrase activity in intertidal macroalgae from southern Spain

Ciencias Marinas, 2009
The effect of UV radiation on photosynthetic rate and carbon uptake, estimated as carbonic anhydrase activity, was studied by incubating intertidal algae, Fucus spiralis (Phaeophyta) and Ulva olivascens (Chlorophyta), under both artificial and solar ...
B Viñegla, F López-Figueroa
doaj   +1 more source