scholarly journals Use of Computed Tomography Scan Technology to Explore the Porosity of Concrete: Scientific Possibilities and Technological Limitations

2021 ◽  
Vol 11 (18) ◽  
pp. 8699
Author(s):  
Miguel Angel Vicente ◽  
Álvaro Mena ◽  
Jesús Mínguez ◽  
Dorys Carmen González
Keyword(s):  
Computed Tomography ◽  
Mercury Porosimetry ◽  
Nitrogen Adsorption ◽  
Technological Advances ◽  
Materials Research ◽  
Technological Limitations ◽  
Near Future ◽  
Concrete Matrix ◽  
Tomography Scan

This paper shows the scientific possibilities of computed tomography for the study of concrete porosity. The enormous technological advances in computed tomography equipment used in materials research, with increasingly higher energy, better resolution and smaller pixel size will allow, in the near future, viewing pore sizes that are currently unthinkable, competing in resolution with the traditional techniques of mercury porosimetry and nitrogen adsorption. The challenge at that time (and to a lesser extent today) will be how to extract as much information as possible from the large amount of data provided by computed tomography equipment. In this article, through the study of six cubic specimens of 40 mm sides, different techniques of extraction and presentation of the information are shown, which help us to better understand the characterization of the morphology and distribution of the pores inside the concrete matrix. This information is essential to understand some of the macroscopic responses of the concrete.

scholarly journals Morphological Characterization of Nanofibers: Methods and Application in Practice

2012 ◽  
Vol 2012 ◽  
pp. 1-14 ◽  
Author(s):  
Jakub Širc ◽  
Radka Hobzová ◽  
Nina Kostina ◽  
Marcela Munzarová ◽  
Martina Juklíčková ◽  
...  
Keyword(s):  
Specific Surface ◽  
Mercury Porosimetry ◽  
Three Dimensional ◽  
Nitrogen Adsorption ◽  
Morphological Characterization ◽  
Biologically Active ◽  
Porous Scaffolds ◽  
Electrospinning Technique ◽  
Pore Size Distributions

Biomedical applications such as wound dressing for skin regeneration, stem cell transplantation, or drug delivery require special demands on the three-dimensional porous scaffolds. Besides the biocompatibility and mechanical properties, the morphology is the most important attribute of the scaffold. Specific surface area, volume, and size of the pores have considerable effect on cell adhesion, growth, and proliferation. In the case of incorporated biologically active substances, their release is also influenced by the internal structure of nanofibers. Although many scientific papers are focused on the preparation of nanofibers and evaluation of biological tests, the morphological characterization was described just briefly as service methods. The aim of this paper is to summarize the methods applicable for morphological characterization of nanofibers and supplement it by the results of our research. Needleless electrospinning technique was used to prepare nanofibers from polylactide, poly(ε-caprolactone), gelatin, and polyamide. Scanning electron microscopy was used to evaluate the fiber diameters and to reveal eventual artifacts in the nanofibrous structure. Nitrogen adsorption/desorption measurements were employed to measure the specific surface areas. Mercury porosimetry was used to determine total porosities and compare pore size distributions of the prepared samples.

scholarly journals Characterization of Cystic Lesions of Pancreas by Computed Tomography Scan- A Retrospective Study

2020 ◽  
Vol 9 (10) ◽  
pp. 726-730
Author(s):  
Rajoo Ramachandran ◽  
Kumaresh Athiyappan ◽  
Prabhu Radhan Radhakrishnan ◽  
Ananda Kumar Balasubramanian
Keyword(s):  
Computed Tomography ◽  
Retrospective Study ◽  
Cystic Lesions ◽  
Computed Tomography Scan ◽  
Tomography Scan

scholarly journals Characterization of Carbon Beads Derived from Porous Polyimide Copolymer

1997 ◽  
Vol 15 (6) ◽  
pp. 437-444 ◽  
Author(s):  
T. Matynia ◽  
B. Gawdzik ◽  
P. Staszczuk
Keyword(s):  
Low Temperature ◽  
Porous Carbon ◽  
Chemical Structure ◽  
Mercury Porosimetry ◽  
Nitrogen Adsorption ◽  
Carbon Sorbent ◽  
Carbon Particles ◽  
Isothermal Analysis ◽  
Porous Copolymer

A new carbon sorbent obtained by the carbonization of beads of the porous copolymer of 4,4′-bis(maleimidodiphenyl)methane and styrene is described. To determine the influence of the carbonization process on the porous and chemical structure of the sorbent, nitrogen adsorption at low temperature, mercury porosimetry, quasi-isothermal analysis and chromatographic measurements were made. The results indicate that polar imide functional groups were destroyed during carbonization, changing the chemical and porous structure of the sorbent. In consequence, non-polar porous carbon particles were obtained.

scholarly journals Correlation between High-Resolution Computed Tomography Scan Findings and Histological Findings in Human Vestibular End Organs and Surgical Implications

2020 ◽  
Vol 25 (Suppl. 1-2) ◽  
pp. 42-49
Author(s):  
Raquel Manrique-Huarte ◽  
Cristina Zulueta-Santos ◽  
Octavio Garaycochea ◽  
Marta Alvarez Linera-Alperi ◽  
Manuel Manrique
Keyword(s):  
Computed Tomography ◽  
Histological Analysis ◽  
Complex Geometry ◽  
Histological Study ◽  
Histological Findings ◽  
Computed Tomography Scan ◽  
High Resolution Computed Tomography ◽  
Membranous Labyrinth ◽  
Technological Advances ◽  
Tomography Scan

Background: Histological study of vestibular end organs has been challenging due to the difficulty in preserving their structures for histological analysis and due to their complex geometry. Recently, radiology advances have allowed to deepen the study of the membranous labyrinth. Summary: A review and analysis of surgical implications related to the anatomy of the vestibular end organ is performed. Radiological advances are key in the advancement of the knowledge of the anatomy and pathology of the vestibule. Thus, application of such knowledge in the development or improvement of surgical procedures may facilitate the development of novel techniques. Key Messages: During the last few decades, the knowledge of the anatomy of the auditory system through histology and radiology had improved. Technological advances in this field may lead to a better diagnosis and therapeutic approach of most common and important diseases affecting the inner ear.

scholarly journals Macro- and micro-anatomical, histological and computed tomography scan characterization of the nasopalatine canal

2009 ◽  
Vol 36 (7) ◽  
pp. 598-603 ◽  
Author(s):  
Xin Liang ◽  
Reinhilde Jacobs ◽  
Wendy Martens ◽  
YuQian Hu ◽  
Peter Adriaensens ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Computed Tomography Scan ◽  
Nasopalatine Canal ◽  
Tomography Scan

scholarly journals CHARACTERIZATION OF THE POROUS STRUCTURE OF CHILEAN VOLCANIC SOILS BY NITROGEN ADSORPTION AND MERCURY POROSIMETRY

2004 ◽  
Vol 49 (4) ◽  
Author(s):  
MÓNICA ANTILÉN ◽  
JUAN E. FÖRSTER ◽  
SYLVIE DEL CONFETTO ◽  
ELIZABETH RODIER ◽  
OLIVER FUDYM ◽  
...  
Keyword(s):  
Porous Structure ◽  
Mercury Porosimetry ◽  
Nitrogen Adsorption ◽  
Volcanic Soils
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