###### Porosity
This can replace the primary porosity or coexist with it (see dual porosity below). Fracture porosity This is porosity ... Secondary porosity A subsequent or separate porosity system in a rock, often enhancing overall porosity of a rock. This can be ... doi:10.1016/j.nima.2007.12.004 Porosity, Absolute Porosity & Effective Porosity Calculations. ... Porosity of subsurface soil is lower than in surface soil due to compaction by gravity. Porosity of 0.20 is considered normal ...
###### Porosity sealing
There are three types of porosity; Flow Porosity, Gas Porosity and Shrink Porosity. Porosity is found in many cast metal ... Porosity sealing, is the process of filling a porous substrate to make it airtight. Porosity is sealed through the process of ... Henkel Corporation (2005). Porosity Sealing by Design. pp. 9-10. Ultraseal, International. "Porosity In Powdered Metal ... Die castings and permanent mold castings commonly contain internal porosity. This porosity is generally localized to the ...
###### Gas porosity
... is the fraction of a rock or sediment filled with a gas. Determining the true porosity of a gas filled formation ... The process of estimating the true porosity in the gas region relies on the appropriate use of the two porosity logs. The ... Therefore, logging a gas-filled formation, results in a porosity estimate that is higher than the true porosity. Overlaying the ... The rate at which the two porosity logs approach the true porosity depends upon their radial sensitivities and their respective ...
###### Effective porosity
That is: Effective porosity = Total porosity − CBW {\displaystyle {\text{Effective porosity}}={\text{Total porosity}}-{\text{ ... Effective porosity ϕ e 3 {\displaystyle \phi _{e3}} Total porosity minus clay-bound water (CBW). Effective porosity ϕ e 4 {\ ... before invoking total vs effective porosity relationships. Bulk density Porosity Gas porosity Vcl has been expressed as: dry ... this core analysis and Petroleum Engineering definition of effective porosity equates to total porosity. Effective porosity ϕ e ...
###### Porosity Storage Reservoir
The porosity, or void space, refers to the open spaces between the sand and gravel, and it is in this area that the water is ... Porosity Storage Reservoir innovations and technologies were created by Donald O. Summers and Stanley R. Peters on behalf of ... Porosity Storage Reservoirs are man-made water storage reservoirs located in shallow alluvial (sand and gravel) deposits. ...
###### Hydrogen gas porosity
... is an aluminium casting defect under the form of a porosity or void in an aluminium casting caused by a ... Hydrogen causes porosity in aluminum products leading to many casting defects, reduced mechanical properties like fatigue and ... Aluminum smelters and aluminum foundries want to produce high quality aluminum and shape castings with minimum porosity. This ... the dissolved hydrogen gas creates porosity in solid aluminium. ...
###### Formation evaluation neutron porosity
... a neutron log will show a low porosity value. This characteristic allows a neutron porosity log to be used with other porosity ... Determination of porosity is one of the most important uses of neutron porosity log. Correction parameters for lithology, ... Neutron temperature Effective porosity Gas porosity John T. Dewan, "Open-Hole Nuclear Logging - State of the Art" - SPWLA ... Neutron porosity measurement employs a neutron source to measure the hydrogen index in a reservoir, which is directly related ...
###### Sliced Porosity Block - CapitaLand Raffles City Chengdu
The Sliced Porosity Block is heated and cooled with 468 geothermal wells and the large ponds in the plaza harvest recycled ... Sliced Porosity Block consists of 5 mixed-use towers with offices, apartments, retail and a hotel, which surround a large ... Sliced Porosity Block - CapitaLand Raffles City Chengdu is a building complex built in Chengdu, China designed by Steven Holl ...
###### Petrophysics
ΦT - Total porosity (PHIT), which includes the pore space in sand and shale. Sw - Total water saturation, the fraction of the ... Porosity: ϕ {\displaystyle \phi } The percentage of a given volume of rock that is pore space and can therefore contain fluids ... Φsh - Shale porosity. Volumetric fraction of pore space in shale. These pore space is filled with bounded water by definition. ... Φe - Effective shale corrected porosity which includes only the pore space in sand. The pore space in shale which is filled ...
###### Shell molding
High porosity possible. Secondary machining often required. High labor cost if done manually. the advantages ok but there also ...
###### Porous set
Zajíček, L. (1987-1988). "Porosity and σ-porosity". Real Anal. Exchange. 13 (2): 314-350. ISSN 0147-1937. MR943561. ... The relationship between porosity and being nowhere dense can be illustrated as follows: if E is nowhere dense, then for x ∈ X ...
###### Earth Revealed: Introductory Geology
It discusses aquifers and aquicludes; rock porosity and permeability; effluence; artesian wells; the water table; the formation ...
###### Sonic logging
This means that a sonic log can be used to calculate the porosity of a formation if the seismic velocity of the rock matrix, V ... Many relationships between travel time and porosity have been proposed, the most commonly accepted is the Wyllie time-average ... porosity. The accuracy of sonic logs is rather poor, evident by the fact that regular- and long-spaced log measurements often ... most notably decreasing with an increasing effective porosity. ...
###### Ice-sheet dynamics
Whether a bed is hard or soft depends on the porosity and pore pressure; higher porosity decreases the sediment strength (thus ... Porosity may vary through a range of methods. Movement of the overlying glacier may cause the bed to undergo dilatancy; the ... A soft bed, with high porosity and low pore fluid pressure, allows the glacier to move by sediment sliding: the base of the ... This increases the porosity. Unless water is added, this will necessarily reduce the pore pressure (as the pore fluids have ...
###### Copper indium gallium selenide solar cells
The increased rate is a result of the greater surface area associated with porosity. Porosity produces rougher absorber ...
###### Vitrification
Vitreous bodies have open porosity, and may be either opaque or translucent. In this context 'zero porosity'; may be defined as ... As vitrification proceeds the proportion of glassy bond increases and the apparent porosity of the fired product becomes ...
###### Silicon organic water repellent
... porosity decreasing impregnation of concrete; manufacture of acid-resistant cement; Glasswork and cerarnics: antireflection ...
###### Shielding gas
Reduces weld porosity in copper. Argon-hydrogen H-2 (98% argon/2% hydrogen) H-5 (95% argon/5% hydrogen) H-10 (80% argon/20% ... Sulfur hexafluoride can be added to shield gas for aluminium welding to bind hydrogen in the weld area to reduce weld porosity ... More than 5% oxygen makes the shielding gas oxidize the electrode, which can lead to porosity in the deposit if the electrode ... Increased oxygen makes the shielding gas oxidize the electrode, which can lead to porosity in the deposit if the electrode does ...
###### Chvorinov's rule
Gas solubility and porosity" (PDF). Georgia Institute of Technology. Retrieved 14 January 2015. ... because if the riser solidifies first then defects like shrinkage or porosity can form. Chvorinov, Nicolas (1940). "Theorie der ...
###### Soil morphology
Porosity of subsurface soil is lower than in surface soil due to compaction by gravity. Porosity of 0.20 is considered normal ... Soil porosity is complex. Traditional models regard porosity as continuous. This fails to account for anomalous features and ... Porosity of topsoil is a measure of the pore space in soil which typically decreases as grain size increases. This is due to ... This calculates to a porosity between 0.43 and 0.36. Typical bulk density of clay soil is between 1.1 and 1.3 g/cm3. This ...
###### Sonoelectrochemistry
... increase in electrodeposit porosity and hardness; increase in gas removal from electrochemical solutions; increase in electrode ...
###### Postage stamp paper
Porosity is a measure of how the paper responds to a liquid. There are several popular stamp collecting terms. On-paper refers ... Porosity is a characteristic of paper. Wood fibers are hydrophilic or water loving. Sizing is added to paper to create a ...
###### Standard gravitational parameter
doi:10.1007/s11208-005-0033-2. D. T. Britt; D. Yeomans; K. Housen; G. Consolmagno (2002). "Asteroid density, porosity, and ...
###### Dodecacalcium hepta-aluminate
Birchall, J. D.; Howard, A. J.; Kendall, K. (1981). "Flexural strength and porosity of cements". Nature. 289 (5796): 388. ... "The Relation between Porosity, Microstructure and Strength, and the Approach to Advanced Cement-Based Materials [and Discussion ...
###### 243 Ida
Britt, D. T.; Yeomans, D. K.; Housen, K.; Consolmagno, G. (2002). "Asteroid Density, Porosity, and Structure" (PDF). Asteroids ... Ida would have a porosity of 11-42%. Ida's interior probably contains some amount of impact-fractured rock, called megaregolith ...