6,058 research outputs found
The Gabriel-Popescu theorem
No full textThe fisrt focus of the paper is to prove and compar two different
version of the Gabriel-Popescu Theorem, showing the connection between the notion of localization and the notion of torsion theory.
Then we will prove, as a corollary, that Grothendieck categories are
locally presentable and, for this purpose, we will show an adjoint functor theorem for locally presentable categories.
Finally we will prove an "analogous-dual" theorem to the Gabriel-Popescu theorem concerning the categories of models of additive k-ary algebraic theories, thanks to the notion of monad and of algebra over a monad
A generalization of the Gabriel–Popescu theorem
No full textAbstractIn this paper we give necessary and sufficient conditions for an additive functor u:u→C, from a small pre-additive category u to a Grothendieck category C, to realize C as a localization of the category of presheaves on u. This is a generalization of the Gabriel–Popescu theorem, which considers the case where u is fully faithful
The Popescu–Gabriel theorem for triangulated categories
No full textAbstractThe Popescu–Gabriel theorem states that each Grothendieck abelian category is a localization of a module category. In this paper, we prove an analogue where Grothendieck abelian categories are replaced by triangulated categories which are well generated (in the sense of Neeman) and algebraic (in the sense of Keller). The role of module categories is played by derived categories of small differential graded categories. An analogous result for topological triangulated categories has recently been obtained by A. Heider
Gabriel–Popescu type theorems and applications
No full textAbstractIn this paper we obtain a general version of Gabriel–Popescu theorem representing any Grothendieck category A as a quotient category of the category of modules over a ring (not necessarily with unit) with enough idempotents to right using a family of generators (Ui)i∈I of A where Ui are not supposed to be small. Applications to locally finite categories are obtained. In particular, for a coalgebra C (over a field) we prove that C is right semiperfect if and only if the category MC has the AB4∗ condition
A generalization of the Mitchell Lemma: The Ulmer Theorem and the Gabriel–Popescu Theorem revisited
No full textAbstractWe prove a generalization of the Mitchell Lemma, and we show that it is a key lemma that can be used in order to deduce in a unified easier way several important results. Thus, the Ulmer Theorem, the generalized Gabriel–Popescu Theorem and the generalized Takeuchi Lemma are all consequences of the generalized Mitchell Lemma
Agricultural management strategies in a changing economy Advances in finance, accounting, and economics (AFAE) book series./ [edited by] Gabriel Popescu and Andrei Jean-Vasile.
No full textIncludes bibliographical references and index."This book brings together emergent research and best practices in the area of agricultural management, policy, and structures, highlighting theoretical concepts and empirical research"--Regional development disparities in romanian agriculture and rural development : a multi-criteria approach / Gabriel Popescu, Bucharest University of Economic Studies, Romania, Simona Bara, Bucharest University of Economic Studies, Romania -- Territorial-based marketing strategies for typical agro-food products : issues and perspectives / Diego Begalli, University of Verona, Italy, Roberta Capitello, University of Verona, Italy, Lara Agnoli, University of Verona, Italy -- The influence of common agricultural policy (cap) on development of the agricultural production structures in romania and eu-28 / Andrei Jean Vasile, Petroleum-Gas University of Ploiesti, Romania, Mieila Mihai, Valahia University of Targoviste, Romania, Smoleanu Alexandra, Petroleum-Gas University of Ploiesti, Romania -- Current state of fish production on carp farms in serbia / Stevan Zanak, State University of Novi Pazar, Republic of Serbia, Jonel Subi?, Institute of Agricultural Economics, Republic of Serbia, Marko Jelo?nik, Institute of Agricultural Economics, Republic of Serbia -- The reform of eu economic governance / Gheorghe Popescu, Dimitrie Cantemir Christian University,Bucharest, Romania -- Soil moisture as one of the limiting factors in the production of medicinal plants / Vladimir Filipovic, Institute for Medicinal Plants Research, Dr Josif Pani¿, Belgrade, Serbia, Natalia Kljajic, Institute of Agricultural Economics, Belgrade, Serbia -- Romanian rural tourism in the context of sustainable development / Marian Zaharia, Petroleum-Gas University of Ploiesti, Romania, Rodica-Manuela Gogonea, Academy of Economic Studies, Romania, Daniela Enachescu, Petroleum-Gas University of Ploiesti, Romania -- Territorial and agricultural resources from the rural vrancea area with decisive role in the development of the local economy / Tataru Alexandra, The National Institute of Economic Research ¿Costin C. Kiritescu, Bucharest, Romania -- Nedelcu adrian, petroleum-gas university of ploiesti, romania -- Changing consumption patterns in green economy / Sima Violeta, Petroleum-Gas University of Ploiesti, Romania, Gheorghe Ileana Georgiana, Petroleum-Gas University of Ploiesti, Romania -- Entrepreneurship in small-scale farms : from production to commercialization / Luøsa Margarida Cagica Carvalho, Open University, Lisbon & CEFAGE, University of Évora, Portugal -- Solar energy potential as support for sustainable development of romanian economy / Dusmanescu Dorel, Petroleum-Gas University of Ploiesti, Romania -- Population number and consumer income and expenditure dynamics:an analysis of world countries / Adrian Stancu, Petroleum-Gas University of Ploie?ti, Faculty of Economic Sciences, Romania -- Combining organic agriculture and recreation : evidence from italy / Donatella Privitera, University of Catania, Department Scienze della Formazione, Catania, Italy -- Rural romanian education : issues of the reform and foreign language teaching / Diana Presad, Petroleum-Gas University of Ploiesti, Romania, Mihaela Badea, Petroleum-Gas University of Ploiesti, Romania -- Green economy and sustainable development / Nica Elvira, University of Economic Studies,Bucharest, Romania -- Ariculture and global climate changes' importance of sustainable management of natural resources / Svetlana Roljevic, Institute of Agricultural Economics Belgrade, Serbia, Marijana Jovanovic, Institute of Agricultural Economics Belgrade, Serbia -- Improved irrigation management for sustainable agriculture / Vesna Popovi?, Institute of Agricultural Economics, Belgrade, Serbia, Vladan Ugrenovic, Agricultural Extension Service Institute Tamic, Panevo, Serbia -- A comparative analysis of the lag tara oasului and tara oltului as romanian management strategies / Andreea Paul, Bucharest Academy of Economic Studies, Romania.1 online resource (xxi, 439 pages)
A Derived Gabriel–Popescu Theorem for t-Structures via Derived Injectives
No full textWe prove a derived version of the Gabriel–Popescu theorem in the framework of dg-categories and t-structures. This exhibits any pretriangulated dg-category with a suitable t-structure (such that its heart is a Grothendieck abelian category) as a t-exact localization of a derived dg-category of dg-modules. We give an original proof based on a generalization of Mitchell’s argument in "A quick proof of the Gabriel-Popesco theorem" that involves derived injective objects. As an application, we provide a short proof of the fact that derived categories of Grothendieck abelian categories have a unique dg-enhancement
Agrifood economics and sustainable development in contemporary society/ Gabriel Popescu, editor.
No full textIncludes bibliographical references and index."This book provides a holistic approach regarding the agrifood and rural economy models and practices, as a specific organizational model in highly competitive economy in its path of adapting to the new challenges. It addresses rural economics, agrifood and environment and its paradigms as it is perceived in modern economies"--Section 1. The actual state. Chapter 1. Determinants of agricultural production in Romania: a panel data approach ; Chapter 2. The competitiveness constraints of Romanian wine sector and the EU-28 agricultural model ; Chapter 3. Sustainable development through field vegetal exploitation in Romania ; Chapter 4. The social, economic, and environmental impact of ecological beekeeping in Romania ; Chapter 5. Sustainable rural livelihood: a case of Hiware Bazaar, Maharashtra, India ; Chapter 6. Sustainable development from a "nature vs. nurture" perspective ; Chapter 7. Green public procurement: instrument of sustainable development ; Chapter 8. Romanian agriculture funding: approaches regarding the funding in Romanian agriculture after EU integration -- Section 2. Institutional structures. Chapter 9. Prerequisites for relaunching economic growth in Romanian agriculture by promoting associativity ; Chapter 10. The role of agricultural cooperatives models among Europe ; Chapter 11. Public-private partnership model for supporting traditional producers -- Section 3. Solutions for the future. Chapter 12. European agriculture in 2020: solutions for a sustainable development ; Chapter 13. Organic agriculture: opportunities and trends ; Chapter 14. The role of higher education in supporting sustainable rural entrepreneurship: a case study ; Chapter 15. The effects of the transition period on the knowledge transfer market in Romanian agriculture ; Chapter 16. Technology scouting and inventions patenting with impact on the agrifood future: INACO institutional innovation for competitiveness in Romania.1 online resource (27 PDFs (xxiii, 401 pages)
Quantitative phase imaging in biomedicine
No full textQuantitative phase imaging (QPI) has emerged as a valuable method for investigating cells and tissues. QPI operates on unlabelled specimens and, as such, is complementary to established fluorescence microscopy, exhibiting lower phototoxicity and no photobleaching. As the images represent quantitative maps of optical path length delays introduced by the specimen, QPI provides an objective measure of morphology and dynamics, free of variability due to contrast agents. Owing to the tremendous progress witnessed especially in the past 10-15 years, a number of technologies have become sufficiently reliable and translated to biomedical laboratories. Commercialization efforts are under way and, as a result, the QPI field is now transitioning from a technology-development-driven to an application-focused field. In this Review, we aim to provide a critical and objective overview of this dynamic research field by presenting the scientific context, main principles of operation and current biomedical applications.
Gabriel Ajak Lat
No full textabstract: Gabriel was ten years old when he left his village.
“Lost Boys Found” is an ongoing, interdisciplinary project that is collecting, recording and archiving the oral histories of the Lost Boys/Girls of Sudan. The collection is a work-in-progress, seeking to record the oral history of as many Lost Boys/Girls as are willing, and will be used in a future book.Age: 27Region: Bahr al GhazalThis picture and bio was donated to the Lost Boys Found project from The Arizona Lost Boys Cente
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