Results 11 to 20 of about 10,077,982 (396)

Molecular tectonics: from crystals to crystals of crystals [PDF]

open access: yesChemical Communications, 2013
The in situ combination of M(II) cations (Co, Ni, Cu or Zn) with 2,4,6-pyridinetricarboxylic acid as a ligand, a bisamidinium dication as a H-bond donor tecton and NaOH leads to the formation of anionic metal complexes ML2(2-) and their interconnection into isomorphous 3D H-bonded networks displaying different colours which were used as preformed seed ...
Gabriela, Marinescu   +3 more
openaire   +2 more sources

SHELXT – Integrated space-group and crystal-structure determination

open access: yesActa Crystallographica Section A: Foundations and Advances, 2015
SHELXT automates routine small-molecule structure determination starting from single-crystal reflection data, the Laue group and a reasonable guess as to which elements might be present.
G. Sheldrick
semanticscholar   +1 more source

Kinematic Evidence for Superbubbles in I Zw 18: Constraints on the Star Formation History and Chemical Evolution [PDF]

open access: yes, 1996
We have combined measurements of the kinematics, morphology, and oxygen abundance of the ionized gas in \IZw18, one of the most metal-poor galaxies known, to examine the star formation history and chemical mixing processes.Comment: 31 pages including 6 ...
Martin, Crystal L.
core   +3 more sources

Crystal structure refinement with SHELXL

open access: yesActa Crystallographica Section C Structural Chemistry, 2015
New features added to the refinement program SHELXL since 2008 are described and explained.
G. Sheldrick
semanticscholar   +1 more source

Efficient Direct Laser Generation by Three‐Phonon‐Assisted Transition with Yb:YCOB Crystal

open access: yesAdvanced Photonics Research, 2023
Electron–phonon‐coupling effect can generate the direct lasing beyond the fluorescence spectrum of the gain medium, but the laser efficiency is still low owing to weak multiphonon‐coupling intensity.
Huichen Si   +5 more
doaj   +1 more source

Crystal Structure of 6,7-Dihydro-5a,7a,13,14-tetraaza-pentaphene-5,8-dione

open access: yesX-ray Structure Analysis Online, 2019
The X-ray crystal structure of 6,7-dihydro-5a,7a,13,14-tetraaza-pentaphene-5,8-dione, a potential antiproliferative agent on A2058 melanoma cells, was established. It crystallizes in the monoclinic space group P21/c with cell parameters a = 24.879(3)A, b
Jean Guillon   +6 more
semanticscholar   +1 more source

Crystal Graph Convolutional Neural Networks for an Accurate and Interpretable Prediction of Material Properties. [PDF]

open access: yesPhysical Review Letters, 2017
The use of machine learning methods for accelerating the design of crystalline materials usually requires manually constructed feature vectors or complex transformation of atom coordinates to input the crystal structure, which either constrains the model
T. Xie, J. Grossman
semanticscholar   +1 more source

Photocatalytic Properties of Nitrogen-Doped Bi12TiO20 Synthesized by Urea Addition Sol-Gel Method

open access: yesInternational Journal of Photoenergy, 2012
Undoped and nitrogen-doped Bi12TiO20 materials were synthesized by urea addition sol-gel method. By adding urea, undoped, and N-doped gel-type precursors were synthesized by low-temperature dehydrolyzation.
Jiyong Wei   +8 more
doaj   +1 more source

Electrospinning fabrication of flexible Fe3O4 fibers by sol-gel method with high saturation magnetization for heavy metal adsorption

open access: yesMaterials & Design, 2020
Magnetic fibers adsorbent has attracted more and more attention because of the large surface area and overcoming the disadvantages of easy agglomeration and difficult separation.
Shuying Shi   +8 more
doaj   +1 more source

Review of the Yb3+:ScBO3 Laser Crystal Growth, Characterization, and Laser Applications

open access: yesApplied Sciences, 2021
Passive Q-switching is an effective approach for generating pulsed lasers, owing to its compact and additional modulation-free design. However, to compare favorably with active Q-switching and multi-stage amplification, the output energy needs to be ...
Dazhi Lu   +4 more
doaj   +1 more source

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