Results 81 to 90 of about 27,054 (290)

Infrared Emission from Interstellar Dust. II. The Diffuse Interstellar Medium [PDF]

, 2001
We present a quantitative model for the infrared emission from dust in the diffuse interstellar medium. The model consists of a mixture of amorphous silicate grains and carbonaceous grains, each with a wide size distribution ranging from molecules ...
Aigen Li, Allain T., Allamandola L. J., B. T. Draine, Boulanger F., Boulanger F., Boulanger F., Cesarsky D., Cesarsky D., Desert F. X., Desert F. X., Duley W. W., Duley W. W., Habing H. J., Hong S. S., Jones A. P., Jones A. P., Kurtz J., Leger A., Leger A., Li A., Mathis J. S., Mattila K., Mattila K., Morgan D. H., Moutou C., Moutou C., Omont A., Onaka T., Pauzat F., Reach W. T., Roche P. F., Roche P. F., Roelfsema P. R., Schutte W. A., Siebenmorgen R., Sturm E., Tanaka M., van der Zwet G. P., Webster A.   +39 more
core   +3 more sources

Microstructural Evolution and Vacancy Defect Formation in Mn–Mo–Ni RPV Steel Under Low Cycle Fatigue: Insights From EBSD and PALS

Advanced Engineering Materials, EarlyView.
Low‐cycle fatigue damage in Mn–Mo–Ni reactor pressure vessel steel is examined using a combined electron backscatter diffraction and positron annihilation lifetime spectroscopy approach. The study correlates texture evolution, dislocation substructure development, and vacancy‐type defect formation across uniform, necked, and fracture regions, providing
Apu Sarkar, Dhanadeep Dutta, G. Bharat Reddy   +2 more
wiley   +1 more source

Tribological Performance of 60NiTi Alloy Under Varying Contact Conditions and Elevated Temperatures in Linear Reciprocating Sliding

Advanced Engineering Materials, EarlyView.
This study investigates the tribological response of 60NiTi alloy under dry, water‐lubricated and high‐temperature conditions. The alloy exhibits decreasing wear volume and friction with increasing temperature due to the formation of protective oxide layers. The work clarifies dominant wear mechanisms and demonstrates the suitability of 60NiTi for high‐
Anthony Onyebuchi Okoani, Miguel Angel Selles, Maziar Ramezani   +2 more
wiley   +1 more source

Impact of grain size distributions on the dust enrichment in high-redshift quasars

, 2012
In high-redshift ($z>5$) quasars, a large amount of dust ($\textstyle\sim 10^{8} \mathrm{M}_{\sun}$) has been observed. In order to explain the large dust content, we focus on a possibility that grain growth by the accretion of heavy elements is the ...
Asano, Bianchi, Draine, Dwek, Fukui, Gall, Gallerani, Gao, Gauger, Groenewegen, Hirashita, Hirashita, Hirashita, Hiroyuki Hirashita, Inoue, Inoue, Juarez, Klessen, Koda, Lodders, Maiolino, Mathis, Matsuoka, Mattsson, McKee, Michałowski, Nozawa, Pei, Pipino, Riechers, Tzu-Ming Kuo, Umeda, Valiante, Valiante, Yan, Zhukovska   +35 more
core   +1 more source

EBSD Study of Creep‐Induced Lattice Misorientation in MgO‐Particle‐Reinforced Austenitic Steel Composites

Advanced Engineering Materials, EarlyView.
Creep experiments at 900°C on coarse‐grained steel‐ceramic composites containing recycled magnesia reveal that higher ceramic volume fractions significantly enhance the creep resistance. Detailed EBSD investigations identify subgrain formation in the steel matrix as the dominant deformation mechanism.
Moritz Müller, Amaya Compart, Mahnaz Mehdizadehlima, Serhii Yaroshevskyi, Christos G. Aneziris, Horst Biermann, Anja Weidner   +6 more
wiley   +1 more source

Dust evolution, a global view I. Nanoparticles, nascence, nitrogen and natural selection … joining the dots [PDF]

Royal Society Open Science, 2016
The role and importance of nanoparticles for interstellar chemistry and beyond is explored within the framework of The Heterogeneous dust Evolution Model for Interstellar Solids (THEMIS), focusing on their active surface chemistry, the effects of ...
A. P. Jones
doaj   +1 more source

Reduction of Oxide Inclusions During the High‐Frequency Welding of Steel via a Nonthermal Ar/H2 Plasma Jet

Advanced Engineering Materials, EarlyView.
High‐frequency (HF) welding of steel is limited by oxide inclusions that degrade weld quality. This study demonstrates, for the first time, the integration of a nonthermal Ar/H2 dielectric barrier discharge (DBD) plasma jet into HF welding. Local plasma treatment provides effective shielding and in‐situ oxide reduction, resulting in markedly fewer and ...
Viktor Udachin, Lienhard Wegewitz, René Gustus, Henning Wiche, Wolfgang Maus‐Friedrichs   +4 more
wiley   +1 more source

Carbonaceous Cosmic Dust Analogs Distinguish between Ion Bombardment and Temperature

The Astrophysical Journal
Carbonaceous cosmic dust is formed in the circumstellar envelopes of asymptotic giant branch stars and supernovae ejecta. Reprocessed carbonaceous cosmic dust, abundant in the light elements C, H, O, and N is found in asteroids and comets. These elements
Linda R. Losurdo, David R. McKenzie
doaj   +1 more source

Photoelectric Emission from Interstellar Dust: Grain Charging and Gas Heating

, 2000
We model the photoelectric emission from and charging of interstellar dust and obtain photoelectric gas heating efficiencies as a function of grain size and the relevant ambient conditions.
Aboue, B. T. Draine, Burtscher H., Canosa A., Chen E. S., Chen G. D., Christophorou L. G., Dartois E., de Jong T., Faraci G., Feuerbacher B., Fujihira M., Habing H. J., Joseph C. Weingartner, Lang N. D., Le, Lehfaoui L., Lichtenberger D. L., Lichtenberger D. L., Maciel W. J., Makov G., Martin C., Mathis J. S., Mezger P. G., Moskovits M., Moustefaoui T., Mu, Nayak S. K., Oliveira S., Omont A., Rebrion -Rowe C., Rowe B. R., Ruoff R. S., Schiedt J., Schmidt -Ott A., Seidl M., Smith D., Spain I. L., Spanel P., Steger H., Tobita S., Tobita S., Tosatti E., Verstraete L., Wang L. -S., Wang X. B.   +45 more
core   +1 more source

Modeling the Infrared Emission from the HR 4796A Disk [PDF]

, 2003
We model the spectral energy distribution (SED) from the mid-infrared to submillimeter of the ring-like disk of HR 4796A, the dustiest A-type star. We consider dust made either of coagulated but otherwise unaltered protostellar interstellar grains, or ...
Li, Aigen, Lunine, J. I.
core   +1 more source