منابع مشابه
Evolving fracture patterns: columnar joints, mud cracks and polygonal terrain.
When cracks form in a thin contracting layer, they sequentially break the layer into smaller and smaller pieces. A rectilinear crack pattern encodes information about the order of crack formation, as later cracks tend to intersect with earlier cracks at right angles. In a hexagonal pattern, in contrast, the angles between all cracks at a vertex are near 120 degrees. Hexagonal crack patterns are...
متن کاملExperimental Determination of the Temperature Suppression in Formation of Gas Hydrate in Water Based Drilling Mud
The aqueous mixtures of light gas molecules under low-temperature and high-pressure conditions are candidates to form gas hydrate clathrates. The formation of gas hydrate may lead to various problems and extra charges in natural gas production and processing. The presence of hydrate crystals forming a stable solid phase can potentially block the wells, pipes, and process facilities. To avoid su...
متن کاملColumnar defect formation in nanorod/Tl2Ba2Ca2Cu3Oz superconducting composites
Nanorod/superconductor composites were formed by depositing Tl2Ba2Ca2Cu3Oz ~Tl-2223! thick films on high density MgO nanorod arrays that were grown on MgO single crystal substrates. Electron microscopy studies show that this approach creates a high density of columnar defects normal to the CuO2 planes within crystal grains of the composites. The nanorod/superconductor composites exhibited enhan...
متن کاملCharacterizing the near-bottom dispersion of drilling mud on three offshore banks
The fate of discharged drilling muds is an ongoing issue for offshore petroleum operators, regulators, the fishing industry and environmentalists. The problem is compounded by difficulties in measuring transient mud concentrations and in relating experience gained at one location to locations with different oceanographic characteristics. We use the benthic boundary layer transport model (bblt) ...
متن کاملHomeostasis of columnar synchronization during cortical map formation
Synchronous spontaneous activity is critical for circuit development. A key open question is to what degree is this synchronization models adult activity or is specifically tuned for circuit development. To address this we used multi-electrode array recordings of spontaneous activity in non-anesthetized neonatal mice to quantify firing rates, synchronization, binary spike-vectors and population...
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ژورنال
عنوان ژورنال: Nature
سال: 1875
ISSN: 0028-0836,1476-4687
DOI: 10.1038/011285b0