نتایج جستجو برای: bed sediments

تعداد نتایج: 77010  

Journal: : 2022

Remains of non-marine bivalves are widespread in the Carboniferous Donets Basin (Eastern Ukraine). The studies this group fauna important for stratigraphy, paleoecology and paleobiogeography. remains were found sediments Mospyne Formation; Carbonicola obtusa (Hind) Naiadites sp. roof shale g2 coal bed; Curvirimula trapeziforma (Dewar) C. tesselata (Jones) identified g12 bed, rectilinearis Truem...

Journal: :Global change biology 2016
Monica B Emelko Micheal Stone Uldis Silins Don Allin Adrian L Collins Chris H S Williams Amanda M Martens Kevin D Bladon

Global increases in the occurrence of large, severe wildfires in forested watersheds threaten drinking water supplies and aquatic ecology. Wildfire effects on water quality, particularly nutrient levels and forms, can be significant. The longevity and downstream propagation of these effects as well as the geochemical mechanisms regulating them remain largely undocumented at larger river basin s...

Journal: :Environmental pollution 2014
Ying-heng Fei Baoshan Xing Xiao-yan Li

Marine sediment with an input of particulate organic matter was incubated to simulate the early aging process. On the sediment after various incubation periods, adsorption and desorption tests were conducted for three selected organic micropollutants: bisphenol A (BPA), 17α-ethinyl estradiol (EE2), and phenanthrene (Phe). The results showed significant sediment organic matter (SOM) decompositio...

2014
Juan C. Larrasoaña Qingsong Liu Pengxiang Hu Andrew P. Roberts Pilar Mata Jorge Civis Francisco J. Sierro José N. Pérez-Asensio

Although recent studies have revealed more widespread occurrences of magnetofossils in pre-Quaternary sediments than have been previously reported, their significance for paleomagnetic and paleoenvironmental studies is not fully understood. We present a paleo- and rock-magnetic study of late Miocene marine sediments recovered from the Guadalquivir Basin (SW Spain). Well-defined paleomagnetic di...

Journal: :E3S web of conferences 2023

The debris flow that interested the Rio Rotiano, a creek located in Province of Trento (Italy) on 29 October 2018, is an event that, because its peculiar features, presents formidable challenges terms mathematical and numerical modelling. Here we present some results our research, which required both physical modelling, aimed at developing tool necessary to face back analysis validation planned...

2003
Richard W. Sheibley John H. Duff Alan P. Jackman Frank J. Triska Jeanne DiLeo

Inorganic N transformations were examined in streambed sediments from the Shingobee River using sediment perfusion cores. The experimental design simulated groundwater–stream water mixing within sediment cores, which provided a well-defined one-dimensional representation of in situ hydrologic conditions. Two distinct hydrologic and chemical settings were preserved in the sediment cores: the low...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی امیرکبیر(پلی تکنیک تهران) - دانشکده مهندسی شیمی 1386

تقاضا برای اُلفین های (آلکِن های) سبک مانند پروپن، بوتن و ایزوبوتن و محصولاتی که از این اُلفین ها تولید می شود، بالا و رو به فزونی است. چون منابع فسیلی (طبیعی) فاقد الفین های سبک می باشند و بیشتر آنها شامل هیدروکربن های اشباع شده و آروماتیکها می باشد، روش های سنتزی برای تولید اُلفین های سبک اجتناب ناپذیر است. یکی از راههای تولید اُلفینهای سبک، هیدروژن زدایی آلکان متناظر- حذف یک مولکول - با آنها می ب...

Journal: :Geomorphology 2021

Knowledge about processes beneath ice sheets, and in particular the connected to subglacial hydrology, is crucial for an understanding of sheets how they react a warming climate. Recently, v-shaped landforms (murtoos) have been found those parts former Fennoscandian Ice Sheet where rapid ice-margin retreat occurred. Based on their geomorphology distribution, murtoos suggested form bed experienc...

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