نتایج جستجو برای: number of patches

تعداد نتایج: 21178810  

2008
Stefan Ås

The diversity, expressed as species richness in equal-sized samples, of wood-living beetles in successional stages of deciduous forest after forest fires approximately 100 years ago did not differ between patch sizes in this study. Thus, the crucial question for conservation is whether the lack of reduction in diversity in small patches means that a number of small patches can elevate the regio...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان - دانشکده ریاضی 1390

abstract: in the paper of black and scholes (1973) a closed form solution for the price of a european option is derived . as extension to the black and scholes model with constant volatility, option pricing model with time varying volatility have been suggested within the frame work of generalized autoregressive conditional heteroskedasticity (garch) . these processes can explain a number of em...

Journal: :CoRR 2017
Matias Martinez Martin Monperrus

In this paper our goal is to perform an open-ended exploration of the program repair search space. Our idea is to collect the largest number of test-suite adequate patches, independently of whether they are fully correct or overfitting. For that, we design Cardumen, a repair approach based mined templates that has an ultra-large search space. We evaluate the capacity of Cardumen to discover tes...

2013
Hamid Siroosi Gholam Ali Heshmati Abdolrassoul Salman Mahini Hamid Reza Naseri

Preservation of ecosystems requires an understanding of the ecosystem processes that regulate ecosystem resources. Patches and inter-patch features are parts of the ecosystem that are partially responsible for effects on transporting and storing materials in the ecosystem. The structural features of ecological patches including size, number and the average inter-patch length are important becau...

Rafieian, M., sharifnia, M.,

 Active control vibrations of an arbitrary point of a simply supported rectangular plate is presented in this paper. The governing differential equation of plate with attached piezoelectric sensor/actuator patches, whose effects of mass and stiffness are included by the local functions, is solved at first. The response of the plate is computed using the first nine natural modes. Then, piezoelec...

Journal: :Physical review letters 2003
Fangliang He Stephen P Hubbell

We develop and test new models that unify the mathematical relationships among the abundance of a species, the spatial dispersion of the species, the number of patches occupied by the species, the edge length of the occupied patches, and the scale on which the distribution of species is mapped. The models predict that species distributions will exhibit percolation critical thresholds, i.e., cri...

Journal: :iranian journal of neonatology 0
mojgan bayatmokhtari - department of pediatrics, mashhad branch , islamic azad university, mashhad, iran gholamali maamouri neonatal research center, ghaem hospital, mashhad university of medical sciences, mashhad, iran. jamshid yousefi department of pediatrics, mashhad branch , islamic azad university, mashhad, iran mojtaba meshkat department of biostatistics, mashhad branch, islamic azad university, mashhad, iran mohammad hoseyni nia mashhad branch, islamic azad university, mashhad, iran

objective conjunctivitis is a common disease in neonates. several bacterial and viral infectious agents may cause it. tear circulation and blinking has protective effects from bacterial colonization in the conjuntival sac. reduced blinking increases the possibility of bacterial conjunctivitis. we studied the effect of eye patches on bacterial colonization of the conjunctival sac.  methods in 10...

Journal: :محیط شناسی 0
مهسا یزدانپناه کارشناسی ارشد مدیریت و برنامه ریزی محیط زیست، دانشکدۀ محیط زیست، دانشگاه تهران احمدرضا یاوری دانشیار گروه برنامه ریزی و مدیریت محیط زیست، دانشکدۀ محیط زیست، دانشگاه تهران لعبت زبردست استادیار گروه برنامه ریزی و مدیریت محیط زیست، دانشکدۀ محیط زیست، دانشگاه تهران سیده آل محمد کارشناسی ارشد برنامه ریزی و مدیریت محیط زیست

introduction “green infrastructure” is a term that describes the abundance and distribution of natural features providing ecological services necessary for community wellbeing specially in urban areas where these are limited. green infrastructure is increasingly espoused by landscape conservation and metropolitan planning because it is an effective way to surrogate ecological network functions ...

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