770 research outputs found
Microstrain in pyrope-grossular garnet solid solution at high pressure: a case study of Py(90)Gr(10) and Py(10)Gr(90) up to 15 GPa
No full textSingle-phase, well-sintered, translucent polycrystalline garnets with compositions of Py(90)Gr(10) and Py(10)Gr(90) were synthesized at 6 GPa and 1400 degrees C using a multi-anvil apparatus. X-ray diffraction (XRD) data for these garnet solid solutions were collected with both high-resolution synchrotron X-ray and standard laboratory X-ray sources. Analysis of the FWHM of the XRD peaks using Williamson-Hall plot yields microstrains around 0.12% for Py(90)Gr(10) and 0.09% for Py(10)Gr(90). The FWHM of Py(10)Gr(90) garnet as well as the derived microstrain remains constant up to 11 GPa, followed by a continuous increase to the experimental peak pressure 15 GPa caused by elastic strain in response to deviatoric/anisotropic stresses. The FWHM and microstrain for Py(90)Gr(10) remain constant to the measurement limit at 7 GPa. The microstrain of pyrope-grossular garnets exhibits a nonlinear dependence on composition, showing two peaks near Py(20)Gr(80) and Py(80)Gr(20), which may be associated with local structural heterogeneities arising from Mg and Ca substitution. Using a third-order Birch-Murnaghan equation of state, the bulk modulus is constrained to be Ie (0) = 171.8 +/- 2.1 GPa (with K-0(') fixed to 5.92) for Py(10)Gr(90) and Ie (0) = 174.3 +/- 2.5 GPa (with K-0(') fixed to 4.4) for Py(90)Gr(10), both of which are much larger than that for intermediate composition close to Py(50)Gr(50) but comparable to that for their corresponding end members. The relatively larger microstrain and higher bulk moduli for Py(10)Gr(90) and Py(90)Gr(10) garnets could be related to short-range ordering of Mg and Ca cations in garnet structure due to substitution, which results in different local environments for Mg and Ca cations along the pyrope-grossular solid solution.DOE/NNSA [DE-NA0002907]; NSF [EAR1524078]SCI(E)ARTICLE6377-3884
atomneb/AtomNeb-py: AtomNeb-py.0.3.0
No full textAtomNeb - Python Package for Atomic Data of Ionized Nebulae
AtomNeb is a database containing atomic data stored in FITS file format generated for for spectral analysis. The AtomNeb Python Package is equipped with several API functions developed in the Python language, which can be used to read atomic data from the AtomNeb FITS files. The API functions of the AtomNeb Python Package, together with the pyEQUIB Python Package, can be used to carry out plasma diagnostics and abundance analysis of spectra emitted from ionized nebulae.
Update Summary
Change data structures from pandas.DataFrame to NumPy
Add Chianti 9.0 atomic data
Citation
@article{Danehkar2020,
author = {{Danehkar}, Ashkbiz},
title = {AtomNeb Python Package, an addendum to AtomNeb: IDL Library for Atomic Data of Ionized Nebulae},
journal = {Journal of Open Source Software},
volume = {5},
number = {55},
pages = {2797},
year = {2020},
doi = {10.21105/joss.02797}
Photodegradation of pyrogenic dissolved organic matter (Py-DOM): a combined photon counting and distribution-based FT-ICR MS study
No full textQuantitative systematic studies are needed to elucidate the both short and long-term environmental implications of increasing pyrogenic dissolved organic matter (Py-DOM) inputs associated with projected increase in wildfire activity over the next century. Time-resolved fluorescence spectroscopy and Fourier transform ion cyclotron resonance were used to characterize extracts of unaltered and pyrolyzed wood and plant material. Upon pyrolysis, extracts shifted from a predominantly phenolic signature to a carboxylic-rich alicyclic configuration. Photodegradation of extracts was commensurate with solar energy exposure. The rate of photodegradation and the degradable fraction of DOM was component driven. Results of this study point to a disproportionate energy-induced response in components common to lignocellulose-derived DOM. Further studies are required to elucidate the mechanistic aspect of photodegradation of DOM, and Py-DOM as relates to energy input
atomneb/AtomNeb-py: AtomNeb-py.0.3.3
No full textAtomNeb - Python Package for Atomic Data of Ionized Nebulae
AtomNeb is a database containing atomic data stored in FITS file format generated for for spectral analysis. The AtomNeb Python Package is equipped with several API functions developed in the Python language, which can be used to read atomic data from the AtomNeb FITS files. The API functions of the AtomNeb Python Package, together with the pyEQUIB Python Package, can be used to carry out plasma diagnostics and abundance analysis of spectra emitted from ionized nebulae.
Update Summary
Add Jupyter Notebooks
Citation
@article{Danehkar2020,
author = {{Danehkar}, Ashkbiz},
title = {AtomNeb Python Package, an addendum to AtomNeb: IDL Library for Atomic Data of Ionized Nebulae},
journal = {Journal of Open Source Software},
volume = {5},
number = {55},
pages = {2797},
year = {2020},
doi = {10.21105/joss.02797}
Analysis on Active Behavior of Bagasse by Py-GC-MS
No full textIn order to find out its active behavior, the extractives of bagasse biomass were adsorbed and determined by Py-GC-MS. And the main constituents were 1-phenanthrenecarboxylic acid, 1,2,3,4,4a,9,10,10a-octahydro-1,4a-di methyl-7- (1-methylethyl)-(52.25%), stigmastan- 3,5-diene (11.3%), 2(1h)-phenanthrenone, 3,4,4a, 9,10,10a-hexahydro-7-hydroxy-1,1,4a-tri methyl-8- (1-methylethyl) - (9.00%), 2- furancarboxaldehyde, 5-(hydroxym ethyl)- (6.25%), etc.</jats:p
In-plane spin reorientation transition in Co/Py bilayers grown epitaxially on vicinal Cu(001)
No full textCo/Py bilayers were grown epitaxially onto a vicinal Cu(001) substrate with the atomic steps parallel to the [110] crystalline axis. We show that the magnetization in vicinal Cu/Co/Py/Cu(001) undergoes an in plane spin reorientation transition (SRT) from perpendicular to parallel direction of the steps as the Co film thickness increases. By performing Rotation Magneto-Optic Kerr Effect (ROTMOKE) measurement as a function of both the Py and the Co film thicknesses, we show that the observed in-plane SRT results from a competition between the step-induced uniaxial anisotropies in the Py and Co films that favor the Py and Co magnetizations perpendicular and parallel to the atomic steps, respectively. Step decoration experiment further shows that the uniaxial anisotropy originates from the step edges of the vicinal surface. (C) 2016 Elsevier B.V. All rights reserved.National Science Foundation NRF through the Global Research Laboratory project of Korea [DMR-1504568]; China Scholarship Council; National Natural Science Foundation of China [51331006]SCI(E)EIARTICLE193-19840
Measurement on Pyrolytic Active Materials of Bagasse Biomass by Py-GC-MS
No full textIn order to find out its active materials, the extractives of bagasse biomass were adsorbed and determined by Py-GC-MS. And the main constituents were 1-phenanthrenecarboxylic acid, 1,2,3,4,4a,9,10,10a- octahydro-1,4a-di methyl-7-(1-methylethyl)-( 24.24%), nonadecane, 1-chloro-(4.36%), stigmast-4-en-3-one(3.94%), 1-nonadecene(3.84%), etc.</jats:p
- …
