نتایج جستجو برای: ecosystems

تعداد نتایج: 45922  

Journal: :Small Business Economics 2022

Abstract The paper draws on network theory to employ concepts of homophily and heterophily investigate whether the presence familiar, unfamiliar or a mix actors in an entrepreneurial ecosystem is related start-up rates. empirical focus this study 81 UK university ecosystems their outputs terms academic spinoff companies. finds that with access predominantly heterophilious character are associat...

Journal: :مرتع و آبخیزداری 0
مسلم برجی حسن گاویار کارشناس ارشد آبخیزداری، دانشکده منابع طبیعی، دانشگاه تهران، ایران هادی اسکندری دامنه دانشجوی دکتری بیابان زدایی، دانشکده منابع طبیعی، دانشگاه هرمزگان، ایران. حسن خسروی استادیار دانشکده منابع طبیعی، دانشگاه تهران، ایران

nowadays, temperature increase, rainfall decrease and its effect on the time dynamics of carbon fixation cycle still are faced by many uncertainties. net primary production (npp) is one of the main factors of carbon cycle; precipitation and temperature measurement are known as two useful tools to study different ecosystems stability and resilience in terms of climate. hence, in this study, npp ...

2017
Daniel R. Amor Raúl Montañez Salva Duran-Nebreda Ricard V. Solé

A major force contributing to the emergence of novelty in nature is the presence of cooperative interactions, where two or more components of a system act in synergy, sometimes leading to higher-order, emergent phenomena. Within molecular evolution, the so called hypercycle defines the simplest model of an autocatalytic cycle, providing major theoretical insights on the evolution of cooperation...

2013
Harris H. Wang Michael T. Mee George M. Church

A major goal in synthetic biology is to construct biological systems with robust and controllable behavior and functionality. Over recent decades, biologists have tried to deconvolve the complexity of life by elucidating key genetic and regulatory determinants, with the hope of eventually engineering biological systems in more predictable ways. Genetic circuits have now been designed and rewire...

2012
Osvaldo E Sala

Glossary Convention on biological diversity The Convention was first enacted in June 1992, has been signed by many countries, and its objectives are the conservation of biological diversity, the sustainable use of its components and the fair and equitable sharing of the benefits arising out of the utilization of genetic resources, including by appropriate access to genetic resources and by appr...

2009
Jon McCormack

This paper addresses problems in computational creative discovery, either autonomous or in synergetic tandem with humans. A computer program generates output as a combination of base primitives whose interpretation must lie outside the program itself. Concepts of combinatoric and creative emergence are analysed in relation to creative outputs being novel and appropriate combinations of base pri...

Journal: :Environmental Health Perspectives 2000
Lindsey A. Greene

An ecosystem is traditionally defined as a community of organisms functioning as an ecological unit in nature. Ecologists often study sites as far away from human influence as possible to get closer to nature. Likewise, when urban educators teach ecology, they often take their students outside the cities to study nature's ecosystems. However, leaving the city limits may no longer be necessary a...

Journal: :CoRR 2009
Gerard Briscoe

We view Digital Ecosystems to be the digital counterparts of biological ecosystems, which are considered to be robust, self-organising and scalable architectures that can automatically solve complex, dynamic problems. So, this work is concerned with the creation, investigation, and optimisation of Digital Ecosystems, exploiting the self-organising properties of biological ecosystems. First, we ...

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