Xem 1-18 trên 18 kết quả Rock formations
  • that can occur during the various phases of oil and gas recovery from subsurface reservoirs including production, drilling, hydraulic fracturing, and workover operations. Formation damage assessment, control, and remediation are among the most important issues to be resolved for efficient exploitation of hydrocarbon reservoirs. Such damage is caused by various adverse processes, including chemical, physical, biological, and thermal interactions of formation and fluids, and deformation of formation under stress and fluid shear.

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  • As may be obvious by now, it is helpful in the understanding of this book to see the earth as having a single soil (as it has a single atmosphere), nearly all of it 10,000 or more years “old,” or in development, since the bulk of its surface “parent material” was laid down. In addition to those cited by Hamaker, some other examples of results obtained with ground gravel (mixed rock) materials may help illustrate the great potential to restore youthfulness and productive fertility to any and all soil....

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  • Volcanic Eruptions and Hazards: What is a volcano? A volcano is a vent or  'chimney' that connects molten  rock (magma) from within the  Earth’s crust to the Earth's  surface.  The volcano includes the surrounding cone of erupted material.

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  • First and foremost, it is a book geared towards fish aquarists. And it is a heavy read with alot of chemistry and biology. To sum up the book: the author wrote the book to bring it to the reader's attention that an aquarium is a sort of (semi)closed ecosystem, and it needs to be thought of as this in order to be successful in raising the plants and animals inside the aquarium. she then describes the biological principles behind her methods of setting up and maintaining "low-tech" planted aquariums (as opposed to hi-tech, like those of takashi amano). She uses...

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  • The world’s climate is changing, and it will continue to change throughout the 21st century and beyond. Rising temperatures, new precipitation patterns, and other changes are already affecting many aspects of human society and the natural world. Climate change is transforming ecosystems at extraordinary rates and scales.

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  • Diamond crystals form deep within the mantle of the earth when carbon is exposed to extreme pressure and very high temperatures. Volcanic rock formations such as kimberlite or lamproite pipes serve as pathways that convey the fragments of rocks and crystals from the mantle to the surface (see.Figure.1). The diamonds, along with vast quantities of magma, are blasted upward in the course of violent eruptions. Kimberlite pipes, the richest source of mined diamonds, are usually shaped like a carrot and can extend as deep as 1 to 2 kilometers underground.

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  • Battelle Memorial Institute is completed a DOE sponsored project that designed an experimental CO2 injection well and prepare it for permitting. Tasks involved include subsurface geologic assessment in the vicinity of the experimental site, seismic characterization of the site, borehole drilling to characterize the reservoir and cap rock formations, injection and monitoring system design, and risk assessment. The well site is located at a large coal fired power plant in west-central West Virginia.

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  • The upper part of the Lower Cretaceous (Aptian and Albian) in Spitsbergen is represented by the marine Carolinefjellet Formation, which consists chiefly of shales, siltstones, and sandstones. In this paper five members are recognized within the formation, and a brief lithological description is given for each member. The two uppermost members, Zillerberget and Schonrockfjellet, are defined as new.

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  • “Be it deep or shallow, red or black, sand or clay, the soil is the link between the rock core of the earth and the living things on its surface. It is the foothold for the plants we grow. Therein lays the main reason for our interest in soils.” --- Roy W. Simonson, USDA Yearbook of Agriculture, 1957. The British naturalist Charles Darwin (1809–1882) was probably the first scientist to examine a soil profile and suggest factors responsible for the structure of the various layers.

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  • (BQ) Ebook Earth Evolution of a habitable world is described in the context of what we know about other planets and the cosmos at large, from the origin of the cosmos to the processes that shape planetary environments and from the origins of life to the inner workings of cells. Astronomy, earth science, planetary science and astrobiology are integrated to give students the whole picture of how the Earth has come to its present state and an understanding of the relationship between key ideas in different fields.

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  • I. General Aspect. Singular beauty of the island Its ancient renown in consequence Fable of its "perfumed winds" (note) Character of the scenery II.

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  • Phuoc  Hiep  corundum  occurrence  has  been  discovered  recently  in  the  Central  part    of  Vietnam  (Quang  Nam  Province).  Common  protoliths  in  the  region  are  high‐grade  metamorphic  rocks (typically of amphibolite‐granulite facies), such as garnet‐bearing amphibolites, gneisses and  schists, intruded by igneous formations of different composition and age. To date, the rubies and  fancy sapphires have been found in secondary, mostly alluvial deposits.

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  • The Japanese love their landscapes tamed and manicured, more parks than wilderness. 12 They like artfully to prune their pines, cultivate simple flower and rock gardens, arrange a waterfall, attract some geese, walk a path with a geometrically rising curve, look back, and enjoy the moon rising over the temple, silhouetting it all. They are hardly interested in admiring a pristine ecosystem or geological formations.

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  • Coal formation has been described as “an inefficiency in the carbon cycle,” (Barghoorn, 1952) when carbon from plants remains in terrestrial sediments and is not recycled to the atmosphere (Figure 1.1.1). Coal is, by definition, a readily combustible rock containing more than 50% by weight and 70% by volume of carbonaceous material (Schopf, 1966). Another definition describes coal as a combustible solid, usually stratified, which originated from the accumulation, burial, and compaction of partially decomposed vegetation in previous geologic ages (Hendricks, 1945)....

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  • The Voi Mep massif of the Truong Son range, having the highest peak in the Quang Tri area (1739m), is composed of granite and granodiorite intrusive rocks in Ben Giang-Que Son complex. This massif is fairly isometric with characteristic landforms comprising: remnants of old pediment surfaces, mountain slopes and valleys with steep profiles.

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  • Aberrant regulation of protein kinases impairs normal cellular functioning and may lead to disease. The protein kinase involved in the regulation of the dynamics of the actin cytoskeleton, Rho-kinase (ROCK), phosphory-lates various substrates (e.g. myosin light chain, myosin phosphatase), caus-ing the formation of actin fibers and tension inside cells.

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  • Alberta’s energy industry has been using the technology for more than 20 years as a method of producing oil from depleted fields. That means Alberta has the current technology and experience needed for wider-scale implementation. We also know CCS has the potential to significantly reduce Alberta’s industrial GHGs—particularly in the oil sands. Research shows the province’s geology is well-suited for storage.

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  • The hatching enzyme of oviparous euteleostean fishes consists of two metalloproteases: high choriolytic enzyme (HCE) and low choriolytic enzyme (LCE). They cooperatively digest the egg envelope (chorion) at the time of embryo hatching. In the present study, we investigated the hatching of embryos of the ovoviviparous black rockfish Sebastes schlegelii.

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