103,186 research outputs found
Antonio Coppi, «vera gloria italiana»
No full textGianpaolo Fassino presenta in questo saggio la figura di Antonio Coppi. Originario di Andezeno, ma vissuto per la gran parte della sua vita a Roma, Antonio Coppi (1783-1870) è noto soprattutto per aver proseguito, fino al 1861, i settecenteschi Annali d’Italia di Lodovico Antonio Muratori. Per lungo tempo gli è stata impropriamente attribuita anche una piccola monografia di storia locale, le Memorie istoriche della Città di Chieri. Un’attenta rilettura di quest’opera ha consentito ora di espungere dalla bibliografia degli scritti di Coppi questo testo, frutto in realtà del lavoro di un altro erudito chierese, Giuseppe Broglia di Casalborgone
Plasma Component of Self-gravitating Disks and Relevant Magnetic Configurations
No full textAstrophysical disks in which the disk self-gravity is more important than the gravity force associated with the central object can have significant plasma components where appreciable toroidal current densities are produced. When the vertical confinement of the plasma rotating structures that can form is kept by the Lorentz force rather than by the vertical component of the gravity force, the disk self-gravity remains important only in the radial equilibrium condition, modifying the rotation curve from the commonly considered Keplerian rotation. The equilibrium equations that are solved involve the vertical and the horizontal components of the total momentum conservation equations, coupled with the lowest order form of the gravitational Poisson's equation. The resulting poloidal field configuration can be visualized as a sequence [1] of Field Reverse Configurations, in the radial direction, consisting of pairs of oppositely directed current channels. The plasma density thus acquires a significant radial modulation that may grow to the point where plasma rings can form [2]. [1] B. Coppi, Phys. Plasmas, 12, 057302 (2005) [2] B. Coppi and F. Rousseau, to be published in Astrophys. J. (April 2006
Self-gravitating Disks and Plasma Structures Immersed in Them
No full textWhen considering axisymmetric differentially rotating plasma structures in the prevalent gravity of a central object these are found to be characterized by a sequence of current filaments and to develop a corresponding ring sequence configuration for the plasma. The same type of structure can be found when the self-gravity of a differentially rotating plasma component is no less important than the gravity of the central object. Then in addition to the vertical and horizontal equilibrium equations to be solved, Poisson's equation for the gravitational potential has to be dealt with. The fact that the vertical equilibrium is ensured by the vertical component of the Lorentz force due to the internal plasma currents (``Lorentz compression'') simplifies the problem considerably.
*Sponsored in part by the Universita' di Milano and by the U.S. DOE B. Coppi and F. Rousseau, Ap. J. 641 (1), 458 (2006)
Patologia dell'Aorta Toracica: angiografia pre-operaotoria per lo studio dell'aorta toracica
No full textLa provincia delle Amazzoni : secondo la relazione del p. illuminato Giuseppe Coppi /
No full textIncludes Italian translations of excerpts from an article by Giuseppe Coppi."Estratto dal Bollettino della Società geografica italiana, marzo, 1885"--T.p. verso.Mode of access: Internet
An efficient decomposition approach for surgical planning
No full textThis talk presents an efficient decomposition approach to surgical planning. Given a set of surgical waiting lists (one for each discipline) and an operating theater, the problem is to decide the room-to-discipline assignment for the next planning period (Master Surgical Schedule), and the surgical cases to be performed (Surgical Case Assignment), with the objective of optimizing a score related to priority and current waiting time of the cases. While in general MSS and SCA may be concurrently found by solving a complex integer programming problem, we propose an effective decomposition algorithm which does not require expensive or sophisticated computational resources, and is therefore suitable for implementation in any real-life setting.
Our decomposition approach consists in first producing a number of subsets of surgical cases for each discipline (potential OR sessions), and select a subset of them. The surgical cases in the selected potential sessions are then discarded, and only the structure of the MSS is retained. A detailed surgical case assignment is then devised filling the MSS obtained with cases from the waiting lists, via an exact optimization model.
The quality of the plan obtained is assessed by comparing it with the plan obtained by solving the exact integrated formulation for MSS and SCA. Nine different scenarios are considered, for various operating theater sizes and management policies. The results on instances concerning a medium-size hospital show that the decomposition method produces comparable solutions with the exact method in much smaller computation time
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