نتایج جستجو برای: river valley landscape

تعداد نتایج: 173158  

2015
Christopher Hill Zhichun Jing Christopher L. Hill

The Late Quaternary geomorphology and stratigraphy of the Big Fork River valley, within the Rainy River basin of northern Minnesota, reveals evidence of prehistoric human interaction with late Holocene riverine environments. By 11000 14 C B.P., deglaciation made the region inhabitable by human groups using Clovis artifacts. Human habitation would also have been possible during the Moorhead low ...

Journal: :Science 2014
Sean D Willett Scott W McCoy J Taylor Perron Liran Goren Chia-Yu Chen

River networks evolve as migrating drainage divides reshape river basins and change network topology by capture of river channels. We demonstrate that a characteristic metric of river network geometry gauges the horizontal motion of drainage divides. Assessing this metric throughout a landscape maps the dynamic states of entire river networks, revealing diverse conditions: Drainage divides in t...

Journal: :space ontology international journal 2015
mehdi khakzand mohsen faizi abbas azari

by considering certain factors like those mentioned by ian thompson (2005) in his definition of landscape, i.e. ecology, community and delight, in designing landscapes, one can find the vocation more applicable and useful. city rivers can play a very important role with regard to such values. in fact, the presence of nature and wildlife could not only be the lifeline of a city, but also a facto...

2011
Alice R. Kelley Joseph T. Kelley Daniel F. Belknap Allen M. Gontz

KELLEY, A.R.; KELLEY, J.T.; BELKNAP, D.F., and GONTZ, A.M., 2011. Coastal and terrestrial impact of the isostatically forced Late Quarternary drainage divide shift, Penobscot and Kennebec Rivers, Maine, USA. Journal of Coastal Research, 27(6), 1085–1093. West Palm Beach (Florida), ISSN 0749-0208. Marine features associated with Late Quaternary isostatic adjustment are well documented in central...

2014
Li Xu Kun Zhang Jin Wang

We explored the underlying mechanisms of differentiation, dedifferentiation, reprogramming and transdifferentiation (cell type switchings) from landscape and flux perspectives. Lineage reprogramming is a new regenerative method to convert a matured cell into another cell including direct transdifferentiation without undergoing a pluripotent cell state and indirect transdifferentiation with an i...

Ecological destruction in human-dominated landscapes has significant impacts on environment sustainability internationally. Landscape planning can play a role in mitigating the effects of human-related activities. One element of landscape planning involves the analysis of the biological, spatial and social arrangement of areas in an urban environment and identifying characteristics that are und...

2015
MACKENZIE R. JEFFRESS CRAIG P. PAUKERT JOANNA B. WHITTIER BRETT K. SANDERCOCK PHILIP S. GIPSON

—The North American river otter (Lontra canadensis) is recovering from near extirpation throughout much of its range. Although reintroductions, trapping regulations and habitat improvements have led to the reestablishment of river otters in the Midwest, little is known about how their distribution is influenced by localand landscape-scale habitat. We conducted river otter sign surveys from Jan....

Journal: :Current Biology 2012
James E. Ferrell

Waddington's epigenetic landscape is probably the most famous and most powerful metaphor in developmental biology. Cells, represented by balls, roll downhill through a landscape of bifurcating valleys. Each new valley represents a possible cell fate and the ridges between the valleys maintain the cell fate once it has been chosen. Here I examine models of two important developmental processes -...

Journal: :محیط شناسی 0
طاهره کوخائی کارشناسی ارشد مهندسی طراحی محیط زیست، دانشکدۀ محیط زیست، دانشگاه تهران محمدرضا مثنوی دانشیار گروه مهندسی طراحی محیط زیست، دانشکدۀ محیط زیست، دانشگاه تهران

introduction the urban population experienced rapid growth in the recent decades, particularly between 1975 and 2000 when it has reached from 1.5 to more than 2 billion people. by turn of the century; half of the world's populations are concentrated in cities. this would severely affect the quality of life in urban areas. accordingly, cities will be faced with significant challenges in inf...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2008
Jin Wang Li Xu Erkang Wang

We established a theoretical framework for studying nonequilibrium networks with two distinct natures essential for characterizing the global probabilistic dynamics: the underlying potential landscape and the corresponding curl flux. We applied the idea to a biochemical oscillation network and found that the underlying potential landscape for the oscillation limit cycle has a distinct closed ri...

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