Results 271 to 280 of about 15,177,396 (356)
Some of the next articles are maybe not open access.
Pure and Applied Chemistry, 1976
Abstract A small grain of iron catalyst, used in the synthesis of ammonia, has an external surface of about 1 cm2/g, but it has an internal surface of 100,000 cm2/g. Since catalysis takes place on the surface, obviously the surface in the pores is of vital importance.
openaire +1 more source
Abstract A small grain of iron catalyst, used in the synthesis of ammonia, has an external surface of about 1 cm2/g, but it has an internal surface of 100,000 cm2/g. Since catalysis takes place on the surface, obviously the surface in the pores is of vital importance.
openaire +1 more source
Pore structure analysis without a pore shape model
Journal of Colloid and Interface Science, 1967Abstract All methods presently employed for pore structure analysis are based on idealized models for the pore shapes. Most investigators assume that the pores are cylindrical; some use the parallel plate pore model. The extent to which valid inferences can be drawn from the structure curves based on such idealizations is open to question.
Stephen Brunauer +2 more
openaire +1 more source
Fracture and pore structure dynamic evolution of coals during hydraulic fracturing
, 2020Hydraulic fracturing is an effective method for producing coalbed methane. To better understand the evolution of the fracture and pore structure of coals that contain macro-fractures during hydraulic fracturing, we have performed a series of in-situ ...
Yiyu Lu +5 more
semanticscholar +1 more source
, 2020
A series of parameters from a variety of techniques, such as pore size distribution, surface area, pore volume, etc., have been used to characterize the pore structure of unconventional shale reservoirs.
Ming Guan +3 more
semanticscholar +1 more source
A series of parameters from a variety of techniques, such as pore size distribution, surface area, pore volume, etc., have been used to characterize the pore structure of unconventional shale reservoirs.
Ming Guan +3 more
semanticscholar +1 more source
Fuel, 2015
Abstract Pore connectivity is limited in shale formations, unlike in conventional reservoirs, for which cyclic void models, such as the regular-lattice model, are often used to represent the connectivity. In the cyclic models, the random assignment of throat sizes to lattice elements leads to a plateau-like variation of a capillary pressure with ...
A. Sakhaee-Pour, Steven L. Bryant
openaire +1 more source
Abstract Pore connectivity is limited in shale formations, unlike in conventional reservoirs, for which cyclic void models, such as the regular-lattice model, are often used to represent the connectivity. In the cyclic models, the random assignment of throat sizes to lattice elements leads to a plateau-like variation of a capillary pressure with ...
A. Sakhaee-Pour, Steven L. Bryant
openaire +1 more source
Structural analysis of mitochondrial pores
Experientia, 1990Structural information about the channel in the mitochondrial outer membrane, derived from sequence analysis and electron microscopy of two-dimensional crystals, is summarized. A model for the channel is presented, consisting of a cylindrical beta-barrel that is formed by one or two 30-kDa polypeptides, with an alpha-carbon backbone diameter of 3.8 nm.
openaire +2 more sources
Nuclear pore structure and function
Seminars in Cell Biology, 1992Nuclear pores are huge macromolecular assemblies, approximately 120 nm in diameter, that perforate the nuclear membrane and mediate nucleocytoplasmic transport. Nuclear pores are constructed from a cylindrical spoke-plug complex sandwiched between nucleoplasmic and cytoplasmic rings.
openaire +2 more sources
Bulletin of the Academy of Sciences of the USSR Division of Chemical Science, 1990
Small-angle x-ray scattering has been used in an investigation of the pore structure of “sivol,” a material prepared by thermochemical treatment of chrysotile asbestos. It has been shown that sivol has a well-developed pore structure. Pore size distribution curves have been obtained, showing a maximum with a radius of gyration R=2.5–3.0 nm.
G. M. Plavnik +3 more
openaire +1 more source
Small-angle x-ray scattering has been used in an investigation of the pore structure of “sivol,” a material prepared by thermochemical treatment of chrysotile asbestos. It has been shown that sivol has a well-developed pore structure. Pore size distribution curves have been obtained, showing a maximum with a radius of gyration R=2.5–3.0 nm.
G. M. Plavnik +3 more
openaire +1 more source
Particle classification and intra-particle pore structure of carbonate sands
, 2020Carbonate soils, known as bioclastic deposits, have been classified as ‘problematic soils’ in many offshore and ocean engineering applications. Carbonate soils have many complicated mechanical properties, e.g., low shear strength and high compressibility,
Bo Zhou +3 more
semanticscholar +1 more source
Powder Technology, 2019
To study the pore structure and fractal characteristics of pulverized intact coal and tectonic coal, proximate analysis, gas adsorption/desorption, and N2 (77K) adsorption experiments were performed. The results show that micropore, minipore and mesopore
Zhenyang Wang +5 more
semanticscholar +1 more source
To study the pore structure and fractal characteristics of pulverized intact coal and tectonic coal, proximate analysis, gas adsorption/desorption, and N2 (77K) adsorption experiments were performed. The results show that micropore, minipore and mesopore
Zhenyang Wang +5 more
semanticscholar +1 more source