Conceiving a high resolution and fast X-ray CT system for imaging fine multi-phase mineral particles and retrieving mineral liberation spectra

2007 ◽  
Vol 84 (1-4) ◽  
pp. 327-336 ◽  
Author(s):  
Gianni Schena ◽  
Luca Santoro ◽  
Stefano Favretto
Keyword(s):  
High Resolution ◽  
X Ray ◽  
Mineral Liberation ◽  
Mineral Particles ◽  
Ct System ◽  
Multi Phase

Application of sensitive, high-resolution imaging at a commercial lab-based X-ray micro-CT system using propagation-based phase retrieval

2017 ◽  
Vol 266 (2) ◽  
pp. 211-220 ◽  
Author(s):  
P. BIDOLA ◽  
K. MORGAN ◽  
M. WILLNER ◽  
A. FEHRINGER ◽  
S. ALLNER ◽  
...  
Keyword(s):  
High Resolution ◽  
Phase Retrieval ◽  
High Resolution Imaging ◽  
Micro Ct ◽  
X Ray ◽  
Resolution Imaging ◽  
Ct System

scholarly journals Development of high-resolution x-ray CT system using parallel beam geometry

2016 ◽  
Author(s):  
Akio Yoneyama ◽  
Rika Baba ◽  
Kazuyuki Hyodo ◽  
Tohoru Takeda ◽  
Haruhisa Nakano ◽  
...  
Keyword(s):  
High Resolution ◽  
Parallel Beam ◽  
X Ray ◽  
Beam Geometry ◽  
Parallel Beam Geometry ◽  
Ct System

High-Resolution X-Ray Computed Tomography for Materials Research

2011 ◽  
Vol 222 ◽  
pp. 48-51 ◽  
Author(s):  
André Egbert ◽  
Oliver Brunke
Keyword(s):  
High Resolution ◽  
High Power ◽  
Industrial Applications ◽  
Research Centre ◽  
X Ray ◽  
Wide Range ◽  
Materials Research ◽  
Ct System ◽  
Gkss Research ◽  
Set Up

Nowadays, X-ray tube-based high-resolution CT systems are widely used in scientific research and industrial applications. But the potential, convenience and economy of these lab systems is often underestimated. The present paper shows the comparison of sophisticated conventional µCT with synchrotron radiation-based µCT (SRµCT). The tube-based µCT measurements were performed with a granite-based phoenix nanotom®-CT system (GE Sensing & Inspection Technologies, Wunstorf, Germany) equipped with a 180 kV, 15 W high-power nanofocus tube with tungsten or molybdenum targets. This X-ray tube opens a wide range of applications from scanning low absorbing samples in nanofocus mode with voxel sizes below 500 nm to scanning highly absorbing objects in the high power mode with focal spot and voxel sizes of a few microns. The SRµCT measurements were carried out with the absorption contrast set-up at the beamlines W 2 and BW 2 at HASYLAB/DESY, operated by the GKSS Research Centre.

scholarly journals High-resolution X-ray spectroscopy of the stellar wind in Vela X-1 during a flare

2020 ◽  
Vol 641 ◽  
pp. A144 ◽  
Author(s):  
M. Lomaeva ◽  
V. Grinberg ◽  
M. Guainazzi ◽  
N. Hell ◽  
S. Bianchi ◽  
...  
Keyword(s):  
High Resolution ◽  
Stellar Wind ◽  
Emission Lines ◽  
High Mass ◽  
Time Resolved ◽  
X Ray ◽  
Multi Phase ◽  
Resonant Transitions ◽  
First Time ◽  
Charged Ions

Context. We present a ~130 ks observation of the prototypical wind-accreting, high-mass X-ray binary Vela X-1 collected with XMM-Newton at orbital phases between 0.12 and 0.28. A strong flare took place during the observation that allows us to investigate the reaction of the clumpy stellar wind to the increased X-ray irradiation. Aims. To examine the wind’s reaction to the flare, we performed both time-averaged and time-resolved analyses of the RGS spectrum and examined potential spectral changes. Methods. We focused on the high-resolution XMM-Newton RGS spectra and divided the observation into pre-flare, flare, and post-flare phases. We modeled the time-averaged and time-resolved spectra with phenomenological components and with the self-consistent photoionization models calculated via CLOUDY and XSTAR in the pre-flare phase, where strong emission lines due to resonant transitions of highly ionized ions are seen. Results. In the spectra, we find emission lines corresponding to K-shell transitions in highly charged ions of oxygen, neon, magnesium, and silicon as well as radiative recombination continua (RRC) of oxygen. Additionally, we observe potential absorption lines of magnesium at a lower ionization stage and features identified as iron L lines. The CLOUDY and XSTAR photoionization models provide contradictory results, either pointing towards uncertainties in theory or possibly a more complex multi-phase plasma, or both. Conclusions. We are able to demonstrate the existence of a plethora of variable narrow features, including the firm detection of oxygen lines and RRC that RGS enables to observe in this source for the first time. We show that Vela X-1 is an ideal source for future high-resolution missions, such as XRISM and Athena.

Electron microscopy of rabbit FC crystals

1983 ◽  
Vol 41 ◽  
pp. 730-731
Author(s):  
Robert A. Grant ◽  
Laura L. Degn ◽  
Wah Chiu ◽  
John Robinson
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
High Resolution Electron Microscopy ◽  
Molecular Replacement ◽  
X Ray ◽  
X Ray Crystallography ◽  
Resolution Electron ◽  
Replacement Technique ◽  
Hydrated Crystal ◽  
Molecular Structure Analysis

Proteolytic digestion of the immunoglobulin IgG with papain cleaves the molecule into an antigen binding fragment, Fab, and a compliment binding fragment, Fc. Structures of intact immunoglobulin, Fab and Fc from various sources have been solved by X-ray crystallography. Rabbit Fc can be crystallized as thin platelets suitable for high resolution electron microscopy. The structure of rabbit Fc can be expected to be similar to the known structure of human Fc, making it an ideal specimen for comparing the X-ray and electron crystallographic techniques and for the application of the molecular replacement technique to electron crystallography. Thin protein crystals embedded in ice diffract to high resolution. A low resolution image of a frozen, hydrated crystal can be expected to have a better contrast than a glucose embedded crystal due to the larger density difference between protein and ice compared to protein and glucose. For these reasons we are using an ice embedding technique to prepare the rabbit Fc crystals for molecular structure analysis by electron microscopy.

High Resolution Study of Polytypism: Application to SiC and Au3 Mn

1982 ◽  
Vol 40 ◽  
pp. 540-541
Author(s):  
G. Van Tendeloo ◽  
J. Van Landuyt ◽  
S. Amelinckx
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Stacking Sequence ◽  
X Ray ◽  
Powerful Technique ◽  
Resolution Study ◽  
The Ideal

Polytypism has been studied for a number of years and a wide variety of stacking sequences has been detected and analysed. SiC is the prototype material in this respect; see e.g. Electron microscopy under high resolution conditions when combined with x-ray measurements is a very powerful technique to elucidate the correct stacking sequence or to study polytype transformations and deviations from the ideal stacking sequence.

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