Sampling and characterization of individual particles in occupational health studies

1999 ◽  
Vol 1 (4) ◽  
pp. 273-283 ◽  
Author(s):  
Hugo M. Ortner
Keyword(s):  
Occupational Health ◽  
Health Studies ◽  
Individual Particles

scholarly journals Crystalline shielding mitigates structural rearrangement and localizes memory in jammed systems under oscillatory shear

2021 ◽  
Vol 7 (20) ◽  
pp. eabe3392
Author(s):  
Erin G. Teich ◽  
K. Lawrence Galloway ◽  
Paulo E. Arratia ◽  
Danielle S. Bassett
Keyword(s):  
Local Structure ◽  
Disordered Systems ◽  
Amorphous Materials ◽  
Structural Rearrangement ◽  
Oscillatory Shear ◽  
Disordered Materials ◽  
Rheological Measurements ◽  
Particle Level ◽  
Individual Particles

The nature of yield in amorphous materials under stress has yet to be fully elucidated. In particular, understanding how microscopic rearrangement gives rise to macroscopic structural and rheological signatures in disordered systems is vital for the prediction and characterization of yield and the study of how memory is stored in disordered materials. Here, we investigate the evolution of local structural homogeneity on an individual particle level in amorphous jammed two-dimensional (athermal) systems under oscillatory shear and relate this evolution to rearrangement, memory, and macroscale rheological measurements. We define the structural metric crystalline shielding, and show that it is predictive of rearrangement propensity and structural volatility of individual particles under shear. We use this metric to identify localized regions of the system in which the material’s memory of its preparation is preserved. Our results contribute to a growing understanding of how local structure relates to dynamic response and memory in disordered systems.

scholarly journals A characterization of bioaerosols in biowaste pretreatment plants in relation to occupational health

2021 ◽  
Vol 131 ◽  
pp. 237-248
Author(s):  
Pil U. Rasmussen ◽  
Hoang U.T. Phan ◽  
Margit W. Frederiksen ◽  
Anne Mette Madsen
Keyword(s):  
Occupational Health

scholarly journals Algorithms for 3D Particles Characterization Using X-Ray Microtomography in Proppant Crush Test

2018 ◽  
Vol 4 (11) ◽  
pp. 134 ◽  
Author(s):  
Ilia Safonov ◽  
Ivan Yakimchuk ◽  
Vladimir Abashkin
Keyword(s):  
Laboratory Method ◽  
X Ray ◽  
Geometric Moments ◽  
Before And After ◽  
Statistical Hypotheses ◽  
Image Processing Algorithms ◽  
A New Technique ◽  
Individual Particles ◽  
Remarkable Advantage

We present image processing algorithms for a new technique of ceramic proppant crush resistance characterization. To obtain the images of the proppant material before and after the test we used X-ray microtomography. We propose a watershed-based unsupervised algorithm for segmentation of proppant particles, as well as a set of parameters for the characterization of 3D particle size, shape, and porosity. An effective approach based on central geometric moments is described. The approach is used for calculation of particles’ form factor, compactness, equivalent ellipsoid axes lengths, and lengths of projections to these axes. Obtained grain size distribution and crush resistance fit the results of conventional test measured by sieves. However, our technique has a remarkable advantage over traditional laboratory method since it allows to trace the destruction at the level of individual particles and their fragments; it grants to analyze morphological features of fines. We also provide an example describing how the approach can be used for verification of statistical hypotheses about the correlation between particles’ parameters and their crushing under load.

scholarly journals High-resolution interference microscopy with spectral resolution for the characterization of individual particles and self-assembled meta-atoms

2019 ◽  
Vol 27 (15) ◽  
pp. 20990 ◽  
Author(s):  
Michail Symeonidis ◽  
Radius N. S. Suryadharma ◽  
Rossella Grillo ◽  
Andreas Vetter ◽  
Carsten Rockstuhl ◽  
...  
Keyword(s):  
High Resolution ◽  
Spectral Resolution ◽  
Interference Microscopy ◽  
Self Assembled ◽  
Individual Particles

scholarly journals Characterization of individual particles in a PM2.5 fraction of an urban air sample

2004 ◽  
Vol 53 (1) ◽  
pp. 45-48 ◽  
Author(s):  
Satoshi NAKANO ◽  
Masako HIRANO ◽  
Bunbunoshin TOMIYASU ◽  
Yoshimasa NIHEI
Keyword(s):  
Urban Air ◽  
Air Sample ◽  
Individual Particles
Sign in / Sign up

Export Citation Format

Share Document