Institution
Romanian Academy
Archive•Bucharest, Romania•
About: Romanian Academy is a archive organization based out in Bucharest, Romania. It is known for research contribution in the topics: Population & Nonlinear system. The organization has 3662 authors who have published 10491 publications receiving 146447 citations. The organization is also known as: Academia Română & Societatea Literară Română.
Papers published on a yearly basis
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TL;DR: In this paper, the authors summarized the main scientific evidence and knowledge gaps on forest livestock grazing through a global review of the literature for the temperate region and stress the need for well-planned real-world experiments and observations, and for more quantitative studies to foster evidence-based conservation management.
50 citations
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01 May 2012TL;DR: The particle volume fraction and temperature dependence of the dynamic viscosity of highly concentrated transformer oil based magnetic nanofluids was investigated in the absence of an external magnetic field and it was concluded that the magnetite nanoparticles agglomerate in small clusters of about 1.3 particles/cluster, due to the van der Waals interactions.
Abstract: In this paper the particle volume fraction and temperature dependence of the dynamic viscosity of highly concentrated transformer oil based magnetic nanofluids was investigated in the absence of an external magnetic field. The solid particle volume fraction dependence of the relative viscosity was found to be very well fitted by the Krieger-Dougherty formula, whence the mean ellipticity of the colloidal particles and the effective surfactant layer thickness were obtained. Using the information on the particles' size and shape statistics obtained from TEM, DLS and magnetogranulometry investigations, it was concluded that the magnetite nanoparticles agglomerate in small clusters of about 1.3 particles/cluster, due to the van der Waals interactions. The effective thickness of the oleic acid surfactant layer was estimated as about 1.4 nm, in very good agreement with the value resulted from previous SANS investigations.
50 citations
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University of La Laguna1, Spanish National Research Council2, University of Tokyo3, Japan Aerospace Exploration Agency4, Chiba Institute of Technology5, Tohoku University6, Brown University7, Romanian Academy8, Kindai University9, University of Aizu10, Rikkyo University11, Kōchi University12, National Institute of Advanced Industrial Science and Technology13, Meiji University14, Planetary Science Institute15, Kobe University16, Osaka University17, University of Paris18, Centre national de la recherche scientifique19, Nagoya University20, Graduate University for Advanced Studies21, Mitsubishi Electric22, University of Liverpool23, Seoul National University24, Hiroshima University25
TL;DR: In this article, the authors used Hayabusa2 observations to show that some of the bright boulders on the dark, carbonaceous (C-type) asteroid Ryugu4 are remnants of an impactor with a different composition as well as an anomalous portion of its parent body.
Abstract: The asteroid (162173) Ryugu and other rubble-pile asteroids are likely re-accumulated fragments of much larger parent bodies that were disrupted by impacts. However, the collisional and orbital pathways from the original parent bodies to subkilometre rubble-pile asteroids are not yet well understood1–3. Here we use Hayabusa2 observations to show that some of the bright boulders on the dark, carbonaceous (C-type) asteroid Ryugu4 are remnants of an impactor with a different composition as well as an anomalous portion of its parent body. The bright boulders on Ryugu can be classified into two spectral groups: most are featureless and similar to Ryugu’s average spectrum4,5, while others show distinct compositional signatures consistent with ordinary chondrites—a class of meteorites that originate from anhydrous silicate-rich asteroids6. The observed anhydrous silicate-like material is likely the result of collisional mixing between Ryugu’s parent body and one or multiple anhydrous silicate-rich asteroid(s) before and during Ryugu’s formation. In addition, the bright boulders with featureless spectra and less ultraviolet upturn are consistent with thermal metamorphism of carbonaceous meteorites7,8. They might sample different thermal-metamorphosed regions, which the returned sample will allow us to verify. Hence, the bright boulders on Ryugu provide new insights into the collisional evolution and accumulation of subkilometre rubble-pile asteroids. The Hayabusa2 team has discovered two types of bright boulder on the dark, carbonaceous asteroid Ryugu. One type has a spectrum consistent with material from an anhydrous silicate-rich asteroid, likely introduced by one or more collisions in Ryugu’s past.
50 citations
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01 Jan 2009TL;DR: This chapter aims to present a balanced review of several traditional well-established methods and new approaches together with typical applications of large-scale complex systems (LSS) by presenting several technology trends in LSS.
Abstract: Large-scale complex systems (LSS) have traditionally been characterized by large numbers of variables, structure of interconnected subsystems, and other features that complicate the control models such as nonlinearities, time delays, and uncertainties. The decomposition of LSS into smaller, more manageable subsystems allowed for implementing effective decentralization and coordination mechanisms. The last decade revealed new characteristic features of LSS such as the networked structure, enhanced geographical distribution and increased cooperation of subsystems, evolutionary development, and higher risk sensitivity. This chapter aims to present a balanced review of several traditional well-established methods and new approaches together with typical applications. First the hierarchical systems approach is described and the transition from coordinated control to collaborative schemes is highlighted. Three subclasses of methods that are widely utilized in LSS – decentralized control, simulation-based, and artificial-intelligence-based schemes – are then reviewed. Several basic aspects of decision support systems (DSS) that are meant to enable effective cooperation between man and machine and among the humans in charge with LSS management and control are briefly exposed. The chapter concludes by presenting several technology trends in LSS.
50 citations
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TL;DR: In this paper, les influences individuelles ou combinees of different oxydes (Sb 2 O 3, CuO, ZnO, Fe 2 o 3, Cr 2 O3, TiO 2, MnO 2 and MoO 3 ) sur la frittabilite et la conductivite electrique de ceramiques a base de SnO 2 ǫ 2 Seul CuO accroit la densite.
Abstract: En vue du developpement d'electrodes pour l'electrolyse de l'aluminium, on etudie les influences individuelles ou combinees de differents oxydes (Sb 2 O 3 , CuO, ZnO, Fe 2 O 3 , Cr 2 O 3 , TiO 2 , MnO 2 et MoO 3 ) sur la frittabilite et la conductivite electrique de ceramiques a base de SnO 2 Seul CuO accroit la densite, alors que Sb 2 O 3 n'accroit la conductivite electrique qu'en presence de CuO
50 citations
Authors
Showing all 3740 results
Name | H-index | Papers | Citations |
---|---|---|---|
Cristina Popescu | 74 | 285 | 18434 |
Adrian Covic | 73 | 570 | 17379 |
Gheorghe Paun | 65 | 399 | 18513 |
Floriana Tuna | 60 | 271 | 11968 |
Arto Salomaa | 56 | 374 | 17706 |
Jan A. Bergstra | 55 | 616 | 13436 |
Alexandru T. Balaban | 53 | 605 | 14225 |
Cristian Sminchisescu | 53 | 173 | 12268 |
Maya Simionescu | 47 | 192 | 10608 |
Marius Andruh | 46 | 239 | 8431 |
Werner Scheid | 46 | 518 | 9186 |
Vicenţiu D. Rădulescu | 46 | 360 | 7771 |
Cornelia Vasile | 44 | 297 | 7108 |
Irinel Popescu | 44 | 401 | 8448 |
Mihail Barboiu | 44 | 239 | 5789 |