197,345 research outputs found
Dynamical extensions of quasi-linear left cycle sets and the Yang-Baxter equation
No full textIn this paper, we give a characterization of the quasi-linear left cycle sets A with Rad(A) Soc(A) via unitary metahomomorphisms and a complete description of those with Rad(A) Fix(A) = Soc(A) improving the results obtained in [F. Catino and M. M. Miccoli, Construction of quasi-linear left cycle sets, J. Algebra Appl. 14(1) (2015), Article ID:1550001, 1-7]. Moreover, we develop a theory of dynamical extensions of quasi-linear left cycle sets to provide new set-theoretic solutions of the Yang-Baxter equation that are non-degenerate, involutive and multipermutational
Minumally invasive videi-assisted thyroidectomy: multinstitutional experience
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Minimally invasive video-assisted thyroidectomy: Multiinstitutional experience
Author(s): Miccoli, P (Miccoli, P); Bellantone, R (Bellantone, R); Mourad, M (Mourad, M); Walz, M (Walz, M); Raffaelli, M (Raffaelli, M); Berti, P (Berti, P)
Source: WORLD JOURNAL OF SURGERY Volume: 26 Issue: 8 Pages: 972-975 DOI: 10.1007/s00268-002-6627-7 Published: AUG 2002
Times Cited: 88 (from Web of Science)
Cited References: 10 [ view related records ] Citation MapCitation Map
Conference: International Surgical Week Conference Location: BRUSSELS, BELGIUM Date: AUG 26-30, 2001
Abstract: Minimally invasive video-assisted thyroidectomy (MINAT) was described in 1998. In this study we collected the experience of four third-level referral centers that adopted this technique. A total of 336 patients (279 females, 57 males) were selected for MINAT. Selection criteria were thyroid volume < 15 ml, nodules not exceeding 3.5 cm of diameter, and an absence of thyroiditis, previous neck surgery, or previous irradiation. The procedure, totally gasless, is carried out through a 15 rum central incision above the sternal notch. Dissection is performed under endoscopic vision using conventional and endoscopic instruments. The mean operating time was 69.4 +/- 30.6 minutes for lobectomy (range 20-150 minutes) and 87.4 +/- 43.5 minutes for total thyroidectomy (range 30-220 minutes). The mean postoperative stay was 1.9 +/- 0.8 days. Postoperative complications were 7 transient and I definitive recurrent nerve palsies and 11 cases of hypoparathyroidism (9 transient, 2 definitive). Conversion to open surgery was necessary in 15 patients (4.5%). This study confirms in a large number of cases the safety and feasibility of MINAT, even in different surgical settings where similar results were achieved. The complication rate was not different from that of standard thyroidectomy. Although the operating time appears longer than with conventional procedures, the learning curve demonstrates a sharp decrease with increasing experience and the introduction of new technologies. The number of patients eligible for this approach remains low, thereby limiting its use, but it should be considered a valid option in selected surgical centers, offering some advantages to patients in terms of cosmetic results and postoperative distress
Set-theoretical solutions of the pentagon equation on groups
No full textLet M be a set. A set-theoretical solution of the pentagon equation on M is a map s : M × M → M × M such that s23 s13 s12 = s12 s23 where (Formula presented.) and (Formula presented.) and τ is the flip map, i.e., the permutation on M × M given by (Formula presented.) for all x,y ε M. In this paper, we give a complete description of the set-theoretical solutions of the form (x.y,x*y) when either (m, .) or (M, *) is a group; moreover, we raise some questions
Al servizio dell’(auto) governo dell’organizzazione giudiziaria. Nascita ed evoluzione della Struttura Tecnica per l’Organizzazione
No full textGli studi organizzativi insegnano che per comprendere nel dettaglio il funzionamento di un organismo occorre oltrepassare il livello prescrittivo delle norme e delle procedure che formalmente ne governano l’azione. Le strutture organizzative, infatti, raramente nascono e si sviluppano in maniera lineare, ma spesso evolvono e si affermano seguendo traiettorie complesse, a volte imprevedibili. Sulla base di tale consapevolezza, questo saggio si propone di ricostruire e commentare il percorso che ha portato alla nascita e al progressivo sviluppo della Struttura Tecnica per l’Organizzazione (S.T.O.), staff che svolge funzioni di supporto permanente alla VII Commissione del Consiglio Superiore della Magistratura
Intern experience at CH���M Hill, Inc.: an internship report
No full textIncludes author's vita"Submitted to the College of Engineering of Texas A&M University in partial
fulfillment of the requirement for the degree of Doctor of Engineering."Includes bibliographical referencesA review of the author's internship experience with CH���M HILL, Inc.
during the period September 1975 through May 1976 is presented. During this nine month
internship the author worked as an Engineer II in the Industrial Processes discipline of this
large consulting engineering firm... The author's prime responsibility was as one of three
lead design engineers on the design of a large wastewater treatment facility for a pulp mill
in Hoquiam, Washington owned by ITT Rayonier Inc. The work generally consisted of the design
of individual treatment units and associated piping and pumping. The purpose of the project
was to provide wastewater treatment capabilities that would satisfy the effluent limitations
(standards) imposed upon the mill by the State of Washington Department of Ecology and the
U.S. Environmental Protection Agency. The author's assignment also entailed necessary
interaction with the project manager and other CH���M HILL design engineers and support staff
members, the client's representatives, and representatives of two other consulting engineering
firms working on the project. Thus, the internship position at CH���M HILL provided considerable
experience coordinating the author's work with the work of other engineers, guiding the design
and administrative efforts of a support staff, and interacting regularly with the client and
other consulting firms. This broad exposure to a variety of engineering and organizational
problems provided a valuable educational experience
Simulation of thermal plant optimization and hydraulic aspects of thermal distribution loops for large campuses
No full textFollowing an introduction, the author describes Texas A&M University and its utilities system. After that, the author presents how to construct simulation models for chilled water and heating hot water distribution systems. The simulation model was used in a $2.3 million Ross Street chilled water pipe replacement project at Texas A&M University. A second project conducted at the University of Texas at San Antonio was used as an example to demonstrate how to identify and design an optimal distribution system by using a simulation model. The author found that the minor losses of these closed loop thermal distribution systems are significantly higher than potable water distribution systems. In the second part of the report, the author presents the latest development of software called the Plant Optimization Program, which can simulate cogeneration plant operation, estimate its operation cost and provide optimized operation suggestions. The author also developed detailed simulation models for a gas turbine and heat recovery steam generator and identified significant potential savings. Finally, the author also used a steam turbine as an example to present a multi-regression method on constructing simulation models by using basic statistics and optimization algorithms. This report presents a survey of the author??s working experience at the Energy Systems Laboratory (ESL) at Texas A&M University during the period of January 2002 through March 2004. The purpose of the above work was to allow the author to become familiar with the practice of engineering. The result is that the author knows how to complete a project from start to finish and understands how both technical and nontechnical aspects of a project need to be considered in order to ensure a quality deliverable and bring a project to successful completion. This report concludes that the objectives of the internship were successfully accomplished and that the requirements for the degree of Degree of Engineering have been satisfied
Menière's Disease and Caloric Stimulation: Some News from an Old Test
No full textOBJECTIVES: The aim of the present study was to improve the instrumental diagnosis of assessing Menière's disease (MD) if the frequency and slow-phase velocity (SPV) of the thermally induced nystagmus analyzed through the caloric vestibular test (CVT) showed different alterations in relationship with an increasing severity of the cochlear involvement. MATERIALS AND METHODS: The study retrospectively analyzed the CVT results of 72 patients affected by unilateral "definite MD" according to the 2015 Barany Society Diagnostic Criteria and treated only conservatively. RESULTS: There were 7 (9.72%) patients in stage 1, 27 (37.50%) in stage 2, 35 (48.61%) in stage 3, and 3 (4.16%) in stage 4. The canal paresis (CP) calculated through the frequency of the thermally induced nystagmus on the affected side increased in more severe stages (p=0.033). Conversely, the CP calculated through the SPV was not significantly different among the stages showing abnormal values even in the early phases of the disease (71% in stage 1, 81% in stage 2, 91% in stage 3, and 100% in stage 4), exclusively on the affected side. CONCLUSION: Abnormalities of the thermally induced nystagmus on the affected side characterize most patients with MD, but only "SPV" alterations are common in the early stages. An increasing severity of the cochlear involvement progressively reflects also on the "frequency" parameter. Detecting a dissociation between these two parameters could represent an instrumental marker of the early forms of MD. Cite this article as: Cerchiai N, Navari E, Miccoli M, Casani AP. Menière's Disease and Caloric Stimulation: Some News from an Old Test. J Int Adv Otol 2019; 15(3): 442-6
La fecondità in Italia: un’analisi spaziale degli indicatori di periodo e una stima della discendenza delle coorti
No full textL’Italia è, ormai da tempo, uno dei paesi con il più basso livello di fecondità nel contesto europeo ed in quello dei paesi a sviluppo avanzato. Questo processo di diminuzione costituisce un tema di estrema importanza; la propensione di una popolazione ad avere figli, infatti, rappresenta un forte segnale dei cambiamenti riguardanti la popolazione e la società.
In questo lavoro, questo tema viene trattato utilizzando un approccio di tipo macro ed applicando metodologie specifiche per quest’ottica. L’obiettivo generale della ricerca è quello di studiare alcune macro-dimensioni dell’evoluzione della fecondità italiana e di fornire un quadro in grado di contribuire alla comprensione profonda delle sue dinamiche passate, presenti e future. In particolare sono analizzati due aspetti: l’evoluzione nel corso del tempo, nelle province italiane, della fecondità di periodo, e la dinamica futura della fecondità delle generazioni, nelle regioni italiane.
La prima parte dell’analisi rileva l’esistenza di un generale processo di convergenza tra territori verso bassi livelli di fecondità, caratterizzato però anche da fasi di divergenza e dall'esistenza di pattern spaziali differenti. L’importanza delle diversità dei percorsi sperimentati dai diversi territori emerge anche quando si cerca di definire, attraverso un modello di regressione spaziale e temporale, il grado di associazione tra alcune caratteristiche demografiche, economiche e sociali con la fecondità a livello provinciale.
La seconda parte dell’analisi restituisce un quadro caratterizzato da cambiamenti che stanno portando e porteranno ad un avvicinamento sempre più intenso nella discendenza finale delle generazioni, tra le diverse regioni. La fecondità finale delle generazioni degli anni Settanta, rispetto a quella delle generazioni precedenti, tenderebbe ad aumentare lievemente o a rimanere costante nelle regioni centro-settentrionali, mentre continuerebbe a diminuire in quelle meridionali; le generazioni dei primi anni Ottanta sembrerebbero destinate invece ad avere una fecondità più bassa, anche nelle regioni del Centro-Nord. Il risultato interessante, in parte atteso ma del quale qui si fornisce una misura, per quanto stimata, è il mutamento della geografia della fecondità delle generazioni.
Realizzato cercando di riabilitare un approccio, quello di tipo macro, posto in secondo piano negli ultimi anni, e cercando di fornire un quadro dell’evoluzione e delle caratteristiche della fecondità nei territori italiani, questo lavoro può costituire un punto di partenza per nuove analisi sul tema, a livello sia macro che micro; può inoltre rivestire particolare utilità nella fase del disegno e dell’implementazione delle politiche e delle misure in grado di arginare o limitare le conseguenze negative sulla popolazione e sulla società del fenomeno della bassa fecondità
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
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