86,756 research outputs found
Many solutions of elliptic problems on R^n of irrational slope
No full textWe consider the problem on , where is
a smooth function periodic of period 1 in all its variables. We show
that, under suitable hypotheses on , this
problem has a family of non self intersecting solutions
, which are at finite distance from a plane of slope
(\o,0,\dots,0) with \o irrational.
These solutions depend on a real parameter ;
if , then the closures of the integer translates of
and of do not intersect
Slope-changing solutions of elliptic problems on .
No full textWe consider the problem on , where is
a smooth function periodic of period 1 in all its variables. We are
going to find a nondegeneracy condition on for which the following
holds. If we are given a sequence of positive integers
and a sequence \{ \a_i \}_{i\in\Z} of real
numbers (the slopes), then we shall find an increasing sequence
of integers and a solution which is entire,
periodic in and which is close to the plane
\a_1(x_1-Q_i)+u(Q_i,0,\dots,0) for
I centri antifumo in Italia e il progetto 6elle
No full textFumare tabacco si configura spesso come una dipendenza patologica, cronica e recidivante, che
è causata dalla nicotina (tabagismo). Favorire la cessazione del fumo dovrebbe essere parte integrante dell’approccio
clinico di ogni medico o altro operatore sanitario nell’ambito della sua pratica professionale quotidiana.
Le linee guida basate sull’evidenza scientifica raccomandano interventi di I e II livello per la cessazione del fumo,
efficaci e con ottimo rapporto costo/benefico. Il Pediatra si trova in una posizione privilegiata per poter svolgere
azioni volte a favorire la cessazione del fumo in soggetti fumatori adulti, perché questi in virtù della stretta relazione
con i pazienti pediatrici, possono essere più motivati ad intraprendere un tentativo di cessazione del fumo.
Questo articolo descrive brevemente la storia e le caratteristiche operative della rete dei centri antifumo in Italia,
come strutture di servizio per svolgere interventi di II livello, e descrive inoltre il progetto 6elle, che propone un
modello per svolgere interventi individuali di I livello per la cessazione del fumo, facilmente applicabile nella
pratica clinica e basato sull’uso di semplici strumenti operativi, accessibili attraverso un sito web dedicato e applicabili
seguendo una procedura modulare
Presentazione di profili di velocità prodotti da un nuovo sistema Doppler Multicanale
No full textshort communication su videocassetta a cura del Centro Didattico Televisivo dell’Università di Firenze, Presentata a International Symposium on Acoustical Imaging, 199
Measuring the foundations of school readiness: Introducing a new questionnaire for teachers - The Brief Early Skills and Support Index (BESSI).
No full textBACKGROUND: Early work on school readiness focused on academic skills. Recent research highlights the value of also including both children's social and behavioural competencies and family support. AIMS: Reflecting this broader approach, this study aimed to develop a new and brief questionnaire for teachers: The Brief Early Skills and Support Index (BESSI). SAMPLE: The main sample, recruited from the north-west of England, included 1,456 children (49% male), aged 2.5 to 5.5 years. A second sample consisting of 258 children (44% male) aged 3 to 5.5 years was recruited to assess the test-retest reliability of the BESSI across a 1-month interval. METHODS: Following development and pilot work with early years teachers, a streamlined (30 items) version of the BESSI was sent to 98 teachers and nursery staff, who rated the children in their class. RESULTS: The best-fitting model included four latent factors: Three child factors (Behavioural Adjustment, Language and Cognition, and Daily Living Skills) and one Family Support factor. The three child factors exhibited measurement invariance across gender. All four factors showed good internal consistency and test-retest reliability. Structural equation modelling showed that (1) boys had more problems than girls on all three child factors; (2) older children showed better Language and Cognition and Daily Living Skills than younger children; and (3) children eligible for free school meals (an index of financial hardship) had more problems on all four latent factors. Family Support latent scores predicted all three child latent factors and accounted for their correlation with financial hardship. CONCLUSIONS: The BESSI is a promising brief teacher-report screening tool that appears suitable for children aged 2.5 to 5.5 and provides a broader perspective upon school readiness than previous measures
Equivalent currents for RCS calculations of flat plates. Improvements and applications to surface impedance coatings.
No full textThe procedure proposed by F. A. Sikta et al (IEEE Trans. Ant. Prop. , vol. AP-31, pp. 584-585, July 1983) is easily and efficiently improved by conveniently utilizing the uniform geometrical theory (UTD) solution for double diffraction in the far zone of a plane wave. It is shown that the same equivalent-current concept can be applied to treat the case of plates with a dielectric coating, which are approximately represented by a surface-impedance boundary condition. To this end, the solution given by G. D. Maliuzhinets (1958), for the diffraction at the edge of a wedge with two different surface-impedance faces, is suitable to define first-order equivalent currents at the edges of each strip
Radar imaging of noncooperating maneuvering aircraft
No full textThe problem of performing automatic high resolution radar imaging of noncooperating maneuvering aircraft is investigated. In order to define the main features of the radar processor, a numerical model of the system which makes use of an electromagnetic model of the moving aircraft so that the actual, complete operating conditions can be simulated has been developed. The availability of such a numerical tool avoids the need to carry out long and onerous experimental tests. In this framework an automatic high-resolution radar imaging technique has been developed. The imaging algorithm provides parameters useful for target classificatio
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