7,263 research outputs found
Dumitru Radu Popescu.
No full text9. O pasăre dintr-o altă zi. Hoṭul de vulturi. Pasărea Shakespeare. Două ore de pace sau cine trece prin aulis. Mai suna-vei dulce corn?... sau cheia fermecată sau omul de cenușă sua rămășagul. F.M.S.M.L.O. sau horia sau lapte de pasăre. Rugăciune pentru un disc-jockey sau ziua de pe insulă. Muntele. Balconul sau clătite cu urdă și cu mărar.Mode of access: Internet
Parameter identification and self-commissioning of AC permanent magnet machines - A review
No full textParameter identification of permanent magnet synchronous machines is a topic of utmost interest these days. The growing effort and investment in this field of research is largely due to the ever-expanding market share of these machines. The high-performance and efficient control of the drive depends on the accuracy with which the information about the machine connected to its terminals is available. The available identification methods are surveyed here and they are classified into offline and online strategies. Self-commissioning, in principle, is a subset of offline methods, yet it is treated separately for its importance in modern adjustable speed drives that tend to minimize the user intervention. Fully exploiting the power electronic converter and the computational power on-board a modern drive, the self-commissioning feature can be embedded in the start-up routine of the drive to estimate the parameters of the machine at hand. This paper presents a review of the parameter identification techniques and schemes investigated over the past few decade
The Cuntz algebra Q_N and C*-algebras of product systems
No full textWe consider a product system over the multiplicative group semigroup N^x of Hilbert bimodules which is implicit in work of S. Yamashita and of the second named author. We prove directly, using universal properties, that the associated Nica-Toeplitz algebra is an extension of the C*-algebra Q_N introduced recently by Cuntz
The Cuntz algebra Q_N and C*-algebras of product systems
No full textWe consider a product system over the multiplicative group semigroup N^x of Hilbert bimodules which is implicit in work of S. Yamashita and of the second named author. We prove directly, using universal properties, that the associated Nica-Toeplitz algebra is an extension of the C*-algebra Q_N introduced recently by Cuntz
From Industrialised to Knowledge-Based Societies: The Metamorphosis of the French Disabled Worker since 1957
No full textPopescu C. From Industrialised to Knowledge-Based Societies: The Metamorphosis of the French Disabled Worker since 1957. In: Dinu RH, Bengtsson S, eds. Disability and Labour in the Twentieth Century. Historical and Comparative Perspectives. Interdisciplinary disability studies. London: Routledge; 2022: 104-121
Telocytes: ultrastructural, immunohistochemical and electrophysiological characteristics in human myometrium.
No full textTelocytes (TCs) have been described in various organs and species (www.telocytes.com) as cells with telopodes (Tps) - very long cellular extensions with an alternation of thin segments (podomers) and dilated portions (podoms). We examined TCs using electron microscopy (EM), immunohistochemistry (IHC), immunofluorescence (IF), time-lapse videomicroscopy and whole-cell patch voltage clamp. EM showed a three-dimensional network of dichotomous-branching Tps, a labyrinthine system with homocellular and heterocellular junctions. Tps release extracellular vesicles (mean diameter of 160.6±6.9 nm in non-pregnant myometrium and 171.6±4.6 nm in pregnant myometrium), sending macromolecular signals to neighbouring cells. Comparative measurements (non-pregnant and pregnant myometrium) of podomer thickness revealed values of 81.94±1.77 vs 75.53±1.81 nm, while the podoms' diameters were 268.6±8.27 vs 316.38±17.56 nm. IHC as well as IF revealed double c-kit and CD34 positive results. Time-lapse videomicroscopy of cell culture showed dynamic interactions between Tps and myocytes. In non-pregnant myometrium, patch-clamp recordings of TCs revealed a hyperpolarisation-activated chloride inward current with calcium dependence and the absence of L-type calcium channels. TCs seem to have no excitable properties similar to the surrounding smooth muscle cells (SMCs). In conclusion, this study shows the presence of TCs as a distinct cell type in human non-pregnant and pregnant myometrium and describes morphometric differences between the two physiological states. In addition, we provide a preliminary in vitro electrophysiological evaluation of the non-pregnant state, suggesting that TCs could influence timing of the contractile activity of SMCs
Birational geometry of the moduli space of quartic surfaces
No full textBy work of Looijenga and others, one understands the relationship between Geometric Invariant Theory (GIT) and Baily-Borel compactifications for the moduli spaces of degree-2 K 3 surfaces, cubic fourfolds, and a few other related examples. The similar-looking cases of degree-4 K 3 surfaces and double Eisenbud-Popescu-Walter (EPW) sextics turn out to be much more complicated for arithmetic reasons. In this paper, we refine work of Looijenga in order to handle these cases. Specifically, in analogy with the so-called Hassett-Keel program for the moduli space of curves, we study the variation of log canonical models for locally symmetric varieties of Type IV associated to D-lattices. In particular, for the 19-dimensional case, we conjecturally obtain a continuous one-parameter interpolation between the GIT and Baily-Borel compactifications for the moduli of degree-4 K 3 surfaces. The analogous 18-dimensional case, which corresponds to hyperelliptic degree-4 K 3 surfaces, can be verified by means of Variation of Geometric Invariant Theory (VGIT) quotients
MARE: resource discovery and configuration in ad hoc networks
No full textThe emergence of personal portable devices, such as PDA's and Mobile phones, with considerable processing and communication capabilities, has led to a desire to use various combinations of these devices together to achieve new and as yet unrealised operations. Not only are mobile devices expected to offer conventional facilities like email and web browsing but also more demanding multimedia applications. Attaining these operations within a fixed network environment with high-power workstations is non-trivial; however, highly dynamic ad hoc environments further complicate this scenario. In particular, a means of discovering available devices and enabling manipulation of them within a highly active environment is required. In this paper we present a novel architecture called MARE that facilitates the detection and manipulation of resources in ad hoc environments
CLIMATE CHANGES – ESSENTIAL CHALLENGE FOR THE ECONOMY OF KNOWLEDGE Emilian M. Dobrescu, Romanian Academy Diana-Mihaela Pociovalisteanu , “Constantin Brancusi†University of Targu Jiu Gabriel Popescu , The Bucharest Academy of Economic Studies
No full textThe European Union proposed a new model of economy, at this beginningof century and millennium: the economy of knowledge, simultaneous with the emergenceof a new existential reality for us people, after Christ was born; this new, existentialreality are the climatic changes.In spite of the warning signals drawn by specialists, the more profound conquests ofscience, only a new educational model can save the humankind of a galloping fall inpromiscuity but also in eternity.economy of knowledge, educational model, cohesion policy, changes
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