نتایج جستجو برای: gas migration
تعداد نتایج: 383613 فیلتر نتایج به سال:
A Markov Chain Analysis of Parallel Genetic Algorithms with Arbitrary Topologies and Migration Rates
Implementations of parallel genetic algorithms (GAs) with multiple populations are common , but they introduce several parameters whose eeect on the quality of the search is not well understood. Parameters such as the number of populations, their size, the topology of communications, and the migration rate have to be set carefully to reach adequate solutions. This paper shows how to predict the...
The gas-phase dissociation chemistry of protonated N,2-diphenyl-N'-(p-toluenesulfonyl) ethanimidamides was investigated by electrospray ionization mass spectrometry in combination with density functional theory calculation. The protonated molecules underwent fragmentation via two main competing channels: (1) migration of the tosyl cation to the anilinic N atom and the subsequent loss of 2-pheny...
Increasing demand for developable space in urban areas has created increased interest in construction on top of old landfills. Landfill redevelopment projects can include hard uses such as commercial, industrial, or infrastructure facilities and soft uses such as athletic fields, golf courses, and amphitheatres. Engineering challenges associated with landfill redevelopment include foundation de...
Iron hydroxide is found in a wide range of contexts ranging from biominerals to steel corrosion, and it can transform to anhydrous oxide via releasing O2 gas and H2O. However, it is not well understood how gases transport through a crystal lattice. Here, we present in situ observation of the nucleation and migration of gas bubbles in iron (hydr)oxide using transmission electron microscopy. We c...
The rates of subsea permafrost degradation and occurrence of gas-migration pathways are key factors controlling the East Siberian Arctic Shelf (ESAS) methane (CH4) emissions, yet these factors still require assessment. It is thought that after inundation, permafrost-degradation rates would decrease over time and submerged thaw-lake taliks would freeze; therefore, no CH4 release would occur for ...
Young planets interact with their parent gas disks through tidal torques. An imbalance between inner and outer torques causes bodies of mass & 0.1 Earth masses (M⊕) to lose angular momentum and migrate inward rapidly relative to the disk; this is known as “Type I” migration. However, protoplanets that grow to gas giant mass, O(10)M⊕ , open a gap in the disk and are subsequently constrained to m...
We present a combined experimental and theoretical study of the fragmentation of doubly positively charged β-alanine molecules in the gas phase. The dissociation of the produced dicationic molecules, induced by low-energy ion collisions, is analysed by coincidence mass spectrometric techniques; the coupling with ab initio molecular dynamics simulations allows rationalisation of the experimental...
The gas phase pyrolysis of trichlorfon was investigated by the on-line gas chromatography - mass spectrometry (GC-MS) pyrolysis and theoretical calculations. Two reaction channels were proposed in the pyrolytic reaction, by analyzing the detected pyrolytic products in the total ion chromatography, including 2,2,2-trichloroacetaldehyde, dimethyl phosphite, and dichlorvos. Theoretical calculation...
The density of oxygen vacancies in semiconductor gas sensors was often assumed to be identical throughout the grain in the numerical discussion of the gas-sensing mechanism of the devices. In contrast, the actual devices had grains with inhomogeneous distribution of oxygen vacancy under non-ideal conditions. This conflict between reality and discussion drove us to study the formation and migrat...
Geochemical Modelling of Hydrogen Gas Migration in Unsaturated Bentonite 1 Buffer 2 3 Majid Sedighi, Hywel Rhys Thomas, Shakil Al Masum, Philip James Vardon, 4 Duncan Nicholson, Alex Chen3 5 6 1 Geoenvironmental Research Centre, Cardiff School of Engineering, Cardiff 7 University, Queen’s Buildings, The Parade, Cardiff, CF24 3AA, United 8 Kingdom. *Corresponding author ([email protected]) 9 2 N...
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