Results 71 to 80 of about 1,061,665 (189)

Assessment of microarchitecture and crystal structure of hydroxyapatite in osteoporosis

open access: yesUniversa Medicina, 2016
Osteoporosis is characterized by lower bone mineral density (BMD) and microarchitectural degeneration, which tends to increase bone fragility and fracture risk.
Zairin Noor   +4 more
doaj   +1 more source

X-Ray Absorption and Scattering by Interstellar Grains

open access: yes, 2016
Interstellar abundance determinations from fits to X-ray absorption edges often rely on the incorrect assumption that scattering is insignificant and can be ignored.
Draine, Bruce T., Hoffman, John A.
core   +1 more source

Unexpected Tellurohalogenation of Terminal N‐Alkynyl (Alkenyl) Derivatives of 4‐Functionalized Pyrazoles

open access: yesChemistryOpen
The efficient synthesis of terminal N‐alkenyl and N‐alkynyl derivatives of pyrazole‐4‐carboxylic acids and their methyl esters as substrates for studying electrophilic heterocyclization has been reported.
Marianna V. Povidaichyk   +3 more
doaj   +1 more source

Characterization of high-quality MgB2(0001) epitaxial films on Mg(0001)

open access: yes, 2005
High-grade MgB2(0001) films were grown on Mg(0001) by means of ultra-high-vacuum molecular beam epitaxy. Low energy electron diffraction and x-ray diffraction data indicate that thick films are formed by epitaxially oriented grains with MgB2 bulk ...
  +13 more
core   +1 more source

Usage of Quantum Chemical Methods to Understand the Formation of Concomitant Polymorphs of Acetyl 2‑(N‑(2-Fluorophenyl)imino)coumarin-3-carboxamide

open access: yesACS Omega, 2021
Svitlana V. Shishkina   +4 more
doaj   +1 more source

High-Temperature X–ray Diffraction Studies of Al–Ni–Hf Ternary Alloys

open access: yesФізика і хімія твердого тіла, 2018
Phase content and temperature dependences of cell parameters for intermetallics HfNi2Al5, Hf6Ni8Al15 and Ni2Al3, existed in Al-Ni-Hf ternary system have been studied by means of X-ray diffraction method.
O. V. Shved, S. I. Mudry, Yu. O. Kulyk
doaj   +1 more source

Ray tracing program with options for diffraction gratings [PDF]

open access: yes, 1971
Diffraction theory, developed in vectorial form and coded into ray tracing routines, permits tracing rays of any wavelength through surfaces that are plane, spherical, conical, or aspheric polynomial.
Howell, B. J.
core   +1 more source

Anisotropic structural dynamics of monolayer crystals revealed by femtosecond surface x-ray scattering

open access: yes, 2018
X-ray scattering is one of the primary tools to determine crystallographic configuration with atomic accuracy. However, the measurement of ultrafast structural dynamics in monolayer crystals remains a long-standing challenge due to a significant ...
Clark, Genevieve   +24 more
core   +1 more source

Characterization by X ray diffraction of mechanically alloyed tripotassium sodium sulfate

open access: yesMaterials Research, 2006
Nanocrystalline powder of tripotassium sodium sulfate (K3Na(SO4)2 - KNS) was successfully obtained by mechanical alloying a mixture of potassium sulfate (K2SO4) and sodium sulfate (Na2SO4) with a proportion of 3:1 in a planetary mill.
Marcus Aurélio Ribeiro Miranda   +4 more
doaj   +1 more source

High-resolution ab initio three-dimensional X-ray diffraction microscopy

open access: yes, 2005
Coherent X-ray diffraction microscopy is a method of imaging non-periodic isolated objects at resolutions only limited, in principle, by the largest scattering angles recorded.
Aleksandr Noy   +57 more
core   +3 more sources

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