Results 21 to 30 of about 209,601 (301)

Molecular Hydrogen in Orion as Observed by the Far Ultraviolet Spectroscopic Explorer

, 2005
Diffuse far-ultraviolet stellar emission scattered by dust grains has been observed in a region near the Orion Nebula. In addition to the scattered stellar continuum, emission and absorption features produced by molecular hydrogen have been identified ...
France, K., McCandliss, S. R.
core   +1 more source

Far-ultraviolet to Near-infrared Observations of SN 2023ixf: A High-energy Explosion Engulfed in Complex Circumstellar Material

The Astrophysical Journal Letters, 2023
We present early-phase panchromatic photometric and spectroscopic coverage spanning the far-ultraviolet to near-infrared regime of the nearest hydrogen-rich core-collapse supernova (SN) in the last 25 yr, SN 2023ixf.
Rishabh Singh Teja, Avinash Singh, Judhajeet Basu, G. C. Anupama, D. K. Sahu, Anirban Dutta, Vishwajeet Swain, Tatsuya Nakaoka, Utkarsh Pathak, Varun Bhalerao, Sudhanshu Barway, Harsh Kumar, Nayana A. J., Ryo Imazawa, Brajesh Kumar, Koji S. Kawabata   +15 more
doaj   +1 more source

The Role of Polycyclic Aromatic Hydrocarbons in Ultraviolet Extinction. I. Probing small molecular PAHs

, 2003
We have obtained new STIS/HST spectra to search for structure in the ultraviolet interstellar extinction curve, with particular emphasis on a search for absorption features produced by polycyclic aromatic hydrocarbons (PAHs).
A. N. Witt, Allain T., Allain T., Allamandola L. J., Allamandola L. J., Boulanger F., D. C. B. Whittet, Duley W. W., F. Salama, Geoffrey C. Clayton, Karl D. Gordon, L. J. Allamandola, Leitherer C., Li A., Mattila K., Michael J. Wolff, Onaka T., Peter G. Martin, Schutte W. A., Smith R. G., T. P. Snow   +20 more
core   +1 more source

Chemical Composition and Spectroscopic Characteristics of Heat-Treated Rubies from Madagascar, Mozambique and Tanzania

Crystals, 2023
The chemical composition and spectra of rubies heat-treated with high temperatures (above 1200 °C) from Madagascar, Mozambique and Tanzania were analyzed by electron microprobe, LA-ICP-MS, Fourier transform infrared spectroscopy, Raman spectroscopy and ...
Ling Yang, Qi Lu, Di Ma, Hairong Zheng, Ruoshui Hu, Zhuohang Shi, Binrong Qin   +6 more
doaj   +1 more source

Effect of molecular weight on the optical properties of polyimide films

Results in Chemistry
To investigate the effect of molecular weight on the optical properties, a series of polyimide films with varying molar ratios of pyromellitic dianhydride (PMDA) to 4,4′-diaminodiphenyl ether (ODA) were synthesized.
Panpan Zhang, Ting Du
doaj   +1 more source

Ultrafast One-Photon (232 vs 266 nm) Bond-Selective Photochemistry of Bromoiodomethane (CH2BrI) in Solution

EPJ Web of Conferences, 2013
Ultrafast broadband transient absorption spectra measured from the deep-ultraviolet to the near-infrared region following single-photon excitation of bromoiodomethane in acetonitrile at different wavelengths manifest chromophore -selective structural ...
Panov M. S., Mereshchenko A. S., Butaeva E. V., Tarnovsky A. N.   +3 more
doaj   +1 more source

Color Genesis of Brown Diamond from the Mengyin Kimberlite, China

Crystals, 2022
The Mengyin diamondiferous kimberlite cluster in Shandong province is one of the three major sources of natural diamond in China, where many brown diamonds are mined, but the genesis of their color is still controversial. In this paper, studies including
Gai-Chao Wu, Xiao-Yan Yu, Fei Liu, Hai-Bo Li, Zheng-Yu Long, Hui Wang   +5 more
doaj   +1 more source

Nanoscale Roughness on the Surface of Polyester Fibers Through Ultraviolet/Ozone Treatment [PDF]

علوم و تکنولوژی پلیمر, 2020
Hypothesis: In recent years, some modern techniques such as plasma, ultraviolet irradiation and ozone treatment have been used in surface modification of polymers.
Fattahi Farnaz Sadat, Akbar Khoddami, Jalal Rahmatinejad   +2 more
doaj   +1 more source

Molecular absorption in transition region spectral lines

, 2014
Aims: We present observations from the Interface Region Imaging Spectrograph (IRIS) of absorption features from a multitude of cool atomic and molecular lines within the profiles of Si IV transition region lines.
Ayres, Thomas, Curdt, Werner, Innes, Davina, Jaeggli, Sarah, Peter, Hardi, Schmit, Donald   +5 more
core   +1 more source

The (Glg)ABCs of cyanobacteria: modelling of glycogen synthesis and functional divergence of glycogen synthases in Synechocystis sp. PCC 6803

FEBS Letters, EarlyView.
We reconstituted Synechocystis glycogen synthesis in vitro from purified enzymes and showed that two GlgA isoenzymes produce glycogen with different architectures: GlgA1 yields denser, highly branched glycogen, whereas GlgA2 synthesizes longer, less‐branched chains.
Kenric Lee, Dimitrios Bekiari, Sofia Doello, Karl Forchhammer   +3 more
wiley   +1 more source