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مقدمه: یکی از مهمترین مراحل در فرآیند تحقیق، هدایت بررسی متون بصورتی مناسب می باشد. این فرآیند از نظر بیشتر دانشجویان و محققین وظیفه ای سنگین و خطیر است(۱). امروزه با توجه به رشد و توسعه فن آوری اطلاعات، محققین با انفجار اطلاعات مواجه هستند، به نحوی که تقریبا در یک روز ۶۰۰۰ متن علمی جدید منتشر می شود و آگاهیهای علمی تقریبا پس از گذشت هر ۵ سال دو برابر می گردد.
متن کاملGeomorphic Controls on Andean Denudation Rates
To predict erosion rates throughout the Andes, we conducted a multiple regression analysis of the sediment discharge from 47 drainage basins in the Bolivian Andes and various topographic, climatologic, and geologic parameters. These mountainous basins are typically large (17–81,000 km; km), often have decades of measurement mean p 11,000 data on daily water and sediment discharge, and display a...
متن کاملRapid, long-term rates of denudation
High rates of erosion (1-15 mm/yr) of fluvial strata have persisted over intervals of 0.2-1.5 m.y. and across areas of 60-2000 km 2 in the Cenozoic foreland basin of northern Pakistan. These rates occur in areas associated with thrust shortening, and they indicate that erosion nearly kept pace with the rates of latest Miocene to Pleistocene uplift. Such high rates of erosion are predicted to pr...
متن کاملThe contribution of mountains to global denudation
The hypothesis that mountains infl uence global climate through links among rock uplift, physical and chemical denudation, and the carbon cycle remains vigorously debated. We address the contribution of mountains to global denudation with an empirical model that predicts that >50% of the total denudation and 40% of the chemical denudation occur on the steepest ~10% of Earth’s terrestrial surfac...
متن کاملEffect of dispase denudation on amniotic membrane
PURPOSE To describe the cellular components, biochemical composition, and membrane surface characteristics of denuded human amniotic membrane (DHAM) treated with Dispase II. METHODS DHAM was incubated with Dispase II (1.2 U/ml) for 30 min, 60 min, or 120 min. This was followed by gentle scraping to remove any remaining epithelial cells using a cell scraper. Histology, immunohistochemistry for...
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ژورنال
عنوان ژورنال: Geological Magazine
سال: 1869
ISSN: 0016-7568,1469-5081
DOI: 10.1017/s0016756800158856