1,534 research outputs found
2-inch diameter (100) β-Ga2O3 crystal growth by the vertical Bridgman technique in a resistance heating furnace in ambient air
Available online 20 May 2020ArticleJOURNAL OF CRYSTAL GROWTH.545:125724(2020)journal articl
Review of CFD Guidelines for Dispersion Modeling
This is the review of CFD (Computational Fluid Dynamics) guidelines for dispersion modeling in the USA, Japan and Germany. Most parts of this review are based on the short report of the special meeting on CFD Guidelines held at the International Symposium on Computational Wind Engineering (CWE2014), University of Hamburg, June 2014. The objective of this meeting was to introduce and discuss the action program to make worldwide guidelines of CFD gas-dispersion modeling. The following six gas-dispersion guidelines including Verification and Validation (V&V) schemes are introduced by each author; (1) US CFD guidelines; (2) COST/ES1006; (3) German VDI (Verein Deutscher Ingenieure) guidelines; (4) Atomic Energy Society of Japan; (5) Japan Society of Atmospheric Environment; (6) Architectural Institute of Japan. All guidelines were summarized in the same format table shown in the main chapters in order to compare them with each other. In addition to the summary of guidelines, the overview of V&V schemes and many guidelines of CFD modeling in the USA are explained
Growth of β-Ga2O3 single crystals using vertical Bridgman method in ambient air
A new approach to beta-Ga2O3 single crystal growth was studied, using the vertical Bridgman (VB) method in ambient air, while measuring the beta-Ga2O3 melting temperature and investigating the effects of crucible composition and shape. beta-Ga2O3 single crystals 25 mm in diameter were grown in platinum rhodium alloy crucibles in ambient air, with no adhesion of the crystals to the crucible wall. Single crystal growth without a crystal seed was realized by (100) faceted growth with a growth direction perpendicular to the (100) faceted plane. (C) 2016 Elsevier B.V. All rights reserved.ArticleJOURNAL OF CRYSTAL GROWTH.447:36-41(2016)journal articl
Dehydriding and rehydriding reactions of LiBHâ‚„
Structural differences in LiBHâ‚„ before and after the melting reaction at approximately 550 K were investigated to clarify the experimental method for the confirmation of reversible dehydriding and rehydriding reactions. Since the long-range order of LiBHâ‚„ begins to disappear after the melting reaction was achieved, investigation of the atomistic vibrations of the [BHâ‚„]-anion in LiBHâ‚„ was found to be effective for the confirmation of the reversibility. In the present study, LiBHâ‚„ was successively dehydrided (decomposed) into LiH and B under 1 MPa of hydrogen at 873 K, and then rehydrided (recombined) into LiBHâ‚„ under 35 MPa of hydrogen at the same temperature (873 K). The temperatures at the beginning and ending of the dehydriding reaction are lowered, by approximately 30 K, for LiBHâ‚„ substituted (or mixed) with Mg (atomic ratio of Li:Mg=9:1) as compared to those for LiBHâ‚„ alone. This is similar to the tendency exhibited by LiNHâ‚‚
First-principles study on the intermediate compounds of LiBH
We report the results of the first-principles calculation on the intermediate
compounds of LiBH. The stability of LiBH and LiBH has been examined with the ultrasoft pseudopotential method based on
the density functional theory. Theoretical prediction has suggested that
monoclinic LiBH is the most stable among the candidate
materials. We propose the following hydriding/dehydriding process of LiBH
via this intermediate compound : LiBHLiBH LiH HLiH B H. The hydrogen content and enthalpy of the first
reaction are estimated to be 10 mass% and 56 kJ/mol H, respectively, and
those of the second reaction are 4 mass% and 125 kJ/mol H. They are in good
agreement with experimental results of the thermal desorption spectra of
LiBH. Our calculation has predicted that the bending modes for the
-phonon frequencies of monoclinic LiBH are lower than
that of LiBH, while stretching modes are higher. These results are very
useful for the experimental search and identification of possible intermediate
compounds.Comment: 7 pages, 5 figures, submitted to PR
Geologic fault model based on the high-resolution seismic reflection profile and aftershock distribution associated with the 2004 Mid-Niigata Prefecture earthquake (M6.8), central Japan
Treatment with empagliflozin, an inhibitor of the sodium/glucose cotransporter 2 (SGLT2), is associated with slower progression of diabetic kidney disease. In this analysis, we explored the hypothesis that empagliflozin may have an impact on urinary peptides associated with chronic kidney disease (CKD). In this post-hoc, exploratory analysis, we investigated urine samples obtained from 40 patients with uncomplicated type 1 diabetes (T1D) before and after treatment with empagliflozin for 8 weeks to for significant post-therapy changes in urinary peptides. We further assessed the association of these changes with CKD in an independent cohort, and with a previously established urinary proteomic panel, termed CKD273. 107 individual peptides significantly changed after treatment. The majority of the empagliflozin-induced changes were in the direction of "CKD absent" when compare to patients with CKD and controls. A classifier consisting of these 107 peptides scored significantly different in controls, in comparison to CKD patients. However, empagliflozin did not impact the CKD273 classifier. Our data indicate that empagliflozin induces multiple significant changes in the urinary proteomic markers such as mucin and clusterin. The relationship between empagliflozin-induced proteomic changes and clinical outcomes merits further investigation
Quinolizidines. XXX. A ready access to the dibenzo[a,f]quinolizidine ring system from 1,2,3,4-tetrahydroquinoline
An alternative synthesis of 9,10-dimethoxydibenzo[a,f]quinolizidine (16) has been accomplished through a route including mercuric acetate-edetic acid oxidation of a benzene-fused piperidine. The route started with an initial condensation of ine (5) with 3,4-dimethoxyphenacyl bromide (6) and proceeded through the amino ketone (7), amino alcohol (8), lactam alcohol (9), N-substituted dihydrocarbostyril (10), and quaternary iminium salt (11 or 15)
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