Results 261 to 270 of about 114,535 (299)

Effective and Total Porosities: Their Reconciliation in Carbonate and Shaly-Sand Systems

Proceedings of SPE Annual Technical Conference and Exhibition, 2006
Abstract Reconciling formation porosity and fluid distribution estimations in carbonate and shaly-sand systems represents a problem that log analysts and petrophysicists face in dealing with well log interpretation. The problem becomes especially challenging when data from conventional (e.g., density, neutron, gamma ray) and non ...
A. Mezzatesta, F. Méndez, E. Rodríguez
openaire   +1 more source

The effect of filter type and porosity on total suspended sediment determinations

Analytical Methods, 2018
Glass fiber filters and cellulose ester membranes from 0.4 to 3.0 μm yielded similar results up to 20 000 mg L−1 of TSS.
Daniele Kasper, João Henrique Fernandes Amaral, Bruce Rider Forsberg   +2 more
openaire   +2 more sources

Influence of porosity on the behavior of cement orthopaedic of total hip prosthesis

Biomaterials and Biomechanics in Bioengineering, 2015
This paper presents three-dimensional finite element method analyses of the distribution of equivalents stress of Von Mises. Induced around a cavity located in the bone cement polymethylmethacrylate (PMMA). The presences and effect of its position in the cement was demonstrated, thus on the stress level and distribution.
Benouis Ali, Serier Boualem, Benbarek Smail   +2 more
openaire   +1 more source

Thermogravimetric evaluation of the specific surface area and total porosity of microporous carbons

Carbon, 1996
Abstract A comparative study was carried out for over 20 microporous carbons using high-resolution thermogravimetry (HRTGA) and adsorption techniques. The utility of the HRTGA technique for characterization of active carbons was demonstrated by correlating the HRTGA data with adsorption measurements. The linear correlation was established between the
D. Pan, M. Jaroniec, J. Klinik
openaire   +1 more source

X-ray Microanalysis of Hydrated Cement: Is the Analysis Total Related to Porosity?

Cement and Concrete Research, 1998
Abstract The significance of the analysis total of X-ray microanalysis of many microporous materials, such as hydrated cement, appears not to be well understood. Taylor [1] has proposed that the analysis total of hydrated cement can be affected by local porosity. The results of the present paper support this idea.
K.O Kjellsen, E Helsing Atlassi
openaire   +1 more source

Measurement of Total NMR Porosity Adds New Value to NMR Logging

5th International Congress of the Brazilian Geophysical Society, 1997
The CMR* Combinable Magnetic Resonance logging tool has been upgraded to provide a robust measurement of clay bound water and microporosity. The upgraded measurement is now possible because of a 50% increase in the signal-to-noise (SIN) ratio, a decrease in the minimum echo spacing from 0.32 ms to 0.2 ms and improved signal processing software that has
R. Freedman, A. Boyd, G. Gubelin, D. McKeon, C.E. Moriss, C. Flaum   +5 more
openaire   +1 more source

Measurements of Clay-Bound Water and Total Porosity by Magnetic Resonance Logging

SPE Annual Technical Conference and Exhibition, 1996
Abstract Pulsed nuclear magnetic resonance (NMR) logging has until now been limited to measurements of capillary bound water and of free fluids, the sum of which is considered the "effective porosity" of rock. Clay-bound water and fluids trapped in micropores generally exhibit NMR relaxation times too fast to be ...
M.G. Prammer, E.D. Drack, J.C. Bouton, J.S. Gardner, G.R. Coates, R.N. Chandler, M.N. Miller   +6 more
openaire   +1 more source

Catalytic membrane materials with a hierarchical porosity and their performance in total oxidation of propene

Catalysis Today, 2010
Abstracts Pt nanoparticles (Pt-NPs) dispersed in either SiO 2 or SiO 2 –TiO 2 hierarchical matrix were investigated for the total oxidation of propene as a typical volatile organic compound. The proposed scalable synthesis method, based on a “one pot” sol–gel pathway enables the encapsulation of isolated Pt-NPs mainly in the organised mesopores and
C. Yacou, A. Ayral, A. Giroir-Fendler, A. Baylet, A. Julbe   +4 more
openaire   +1 more source

New Analytical Method To Calculate Matrix- and Fluid-Corrected Total Porosity in Organic Shale

SPE Reservoir Evaluation & Engineering, 2014
Summary Estimation of total porosity from neutron and density porosity logs in organic shale (source rock) is challenging because these logs are substantially affected by fluid and matrix-composition effects. Conventional interpretation of neutron and density porosity logs often includes corrections for shale concentration in which the ...
Edwin Ortega(ConocoPhillips), Carlos Torres-Verdín   +1 more
openaire   +1 more source

Relationship between the total and open porosity of sintered Cu-Sn-C materials

Soviet Powder Metallurgy and Metal Ceramics, 1966
1. Sintering temperature affects differently the total and open porosity of Cu-Sn-C material. 2. The Po/Pt vs T function has a minimum, which is displaced toward lower temperatures with increasing compacting pressure.
A. B. Al'tman, V. M. Valakina, V. P. Karpova, V. M. Memelov, V. N. Sorokina   +4 more
openaire   +1 more source