Quantitative isoperimetric inequalities in H^n

In the Heisenberg group H^n, we prove quantitative isoperimetric inequalities for Pansu's spheres, that are known to be isoperimetric under various assumptions. The inequalities are shown for suitably restricted classes of competing sets and the proof relies on the construction of sub-calibrations

L'esclusione della legittimazione ad agire degli enti locali nell'azione risarcitoria in tema di danno ambientale: la negazione del "federalismo ambientale"

Il saggio si occupa della legittimazione ad agire e dell’intervento nei giudizi di risarcimento del danno ambientale, ponendo una particolare attenzione all’esclusione da tale legittimazione degli enti locali. Il tema solleva oggi profili di criticità, dovendo leggere quanto disposto dall’art. 311, d.lg. n. 152 del 2006 alla luce di disposizioni comunitarie e costituzionali, nonché di norme di rango primario, quale il d.lg. n. 85 del 2010, in tema di federalismo demaniale, il quale ha riconosciuto, nel rispetto dei principi di sussidiarietà e di leale collaborazione, una centralità di competenze e di funzioni agli enti locali nella gestione del proprio territorio, centralità allo stesso tempo negata dalle forti spinte Stato-centriche del Codice del 2006 che contribuiscono solo alla riduzione della tutela dell’ambiente

Il diritto di accesso ai documenti amministrativi: a proposito dei soggetti attivi per un'azione amministrativa trasparente, ma non troppo

Il saggio si occupa del diritto di accesso ai documenti amministrativi, previsto dall'art. 22 ss., l. n. 241/1990, con particolare riguardo per i soggetti attivi del diritto di accesso e tra questi la pubblica amministrazione, le associazioni dei consumatori e i consiglieri comunali e provinciali. La rilevanza del tema non trova una giusta corrispondenza nelle diverse disposizioni di legge che disciplinano le differenti modalità di accesso in riferimento ai tre soggetti attivi oggetto di analisi, creando un sistema normativo poco omogeneo e non adeguatamente orientato ai principi costituzionali e dell'Unione europea

Extremal polynomials in stratified groups

We introduce a family of extremal polynomials associated with the prolongation of a stratified nilpotent Lie algebra. These polynomials tre related to a new algebraic characterization of abnormal sub-Riemannian extremals in stratified nilpotent Lie groups. They satisfy a set of remarkable structure relations that are used to integrate the adjoint equations, in both normal and abnormal case

Phenomenology at the LHC of composite particles from strongly interacting Standard Model fermions via four-fermion operators of NJL type

A new physics scenario shows that four-fermion operators of Nambu-Jona-Lasinio (NJL) type have a strong-coupling UV fixed point, where composite fermions $F$ (bosons $\Pi$) form as bound states of three (two) SM elementary fermions and they couple to their constituents via effective contact interactions at the composite scale $\Lambda \approx {\cal O}$(TeV). We present a phenomenological study to investigate such composite particles at the LHC by computing the production cross sections and decay widths of composite fermions in the context of the relevant experiments at the LHC with $pp$ collisions at $\sqrt{s}={\rm 13}$ TeV and $\sqrt{s}={\rm 14}$ TeV. Systematically examining all the different composite particles $F$ and the signatures with which they can manifest, we found a vast spectrum of composite particles $F$ that has not yet been explored at the LHC. Recasting the recent CMS results of the resonant channel $pp\rightarrow e^+F \rightarrow e^+e^- q\bar{q}'$, we find that the composite fermion mass $m_F$ below 4.25 TeV is excluded for $\Lambda$/$m_F$ = 1. We further highlight the region of parameter space where this specific composite particle $F$ can appear using 3 ab$^{-1}$, expected by the High-Luminosity LHC, computing 3 and 5 $\sigma$ contour plots of its statistical significance.Comment: To appear in EPJC. This revised version expands the search for composite fermion F considering all its possible flavors and topologies and highlighting the signatures not yet investigated at LH

Extremal curves in nilpotent Lie groups

We classify extremal curves in free nilpotent Lie groups. The classification is obtained via an explicit integration of the adjoint equation in Pontryagin Maximum Principle. It turns out that abnormal extremals are precisely the horizontal curves contained in algebraic varieties of a specific type. We also extend the results to the nonfree case.Comment: 30 pages, final versio

Extremal polynomials in stratified groups

We introduce a family of extremal polynomials associated with the prolongation of a stratified nilpotent Lie algebra. These polynomials are related to a new algebraic characterization of abnormal subriemannian geodesics in stratified nilpotent Lie groups. They satisfy a set of remarkable structure relations that are used to integrate the adjoint equations

Codice delle leggi sull'ambiente

Il codice raccoglie le principali norme in materia ambientale divise per settori e aggiornato al gennaio 202

Influence of coaches on sources of enjoyment in youth basketball

We examined the influence of coaches on sources of enjoyment of youth basketball players accounting for differences in chronological age, biological maturity status and years of training experience. Fifty-eight male basketball players aged 9.5 to 15.5 years were considered from a youth club. Three coaches supervising yearly age group teams from under 11 to under 15 teams were considered. Variables included chronological age, estimated age at peak height velocity, years of training experience, stature, body mass and sitting height by anthropometry; Sources of Enjoyment in Youth Sport Questionnaire was used. Multilevel modelling was used to partition variance between groups and control the influence of age and maturity status on enjoyment. Variance partition coefficients derived from multilevel null models showed a substantial variation by coach for age, maturity status and body dimensions. For the sources of enjoyment dimensions it was apparent an influence of the coach mostly for positive parental involvement. Controlling separately for age and somatic maturity status category, substantial variation by coach became apparent for self-referenced competencies and affiliation with peers, and the influence of coach was removed for positive parental involvement. After controlling variation associated to the coach the influence of age and maturity status remained present. The influence of the coach in the sources of enjoyment in adolescent basketball was apparent in adolescent basketball players. Furthermore, coaches' influence became more apparent after accounting for age and biological maturity status differences between players.El presente estudio investiga la influencia de los entrenadores en la satisfacción con la práctica deportiva en baloncesto juvenil, considerando las diferencias en la edad cronológica, maduración biológica y años de experiencia de entrenamiento. Los participantes (n = 58) de 9.5 a 15.5 años de un club de baloncesto juvenil participaron en el estudio. Tres entrenadores del club que conducirán equipas de sub-11 à sub-15 fueran considerados. Las variables incluyen la edad cronológica, edad estimada en el pico de crecimiento en la pubertad, años de experiencia de entrenamiento; estatura, masa corporal e altura sentado por antropometría; y el cuestionario Sources of Enjoyment in Youth Sport. Modelos multinivel fueran utilizados para investigar la variancia entre grupos y controlar el efecto de la edad y del estado de maduración en la satisfacción con la práctica deportiva. Los coeficientes de partición de la variancia resultantes de los modelos multinivel (modelos nulos) muestran una variación substancial cuando los jugadores están agrupados por entrenador para la edad, maduración biológica y tamaño corporal. En las dimensiones del Sources of Enjoyment in Youth Sport fue aparente una influencia del entrenador, sobretodo en el envolvimiento parental positivo. Controlando separadamente para la edad y de la maduración biológica, la influencia del entrenador se observa para las competencias auto referenciadas y para la afiliación con los pares, siendo removida la influencia del entrenador para el envolvimiento parental positivo. Después de controlar la variación asociada al entrenador la influencia de la edad e de la maduración biológica se mantenía. La influencia del entrenador en la satisfacción con la práctica deportiva en baloncesto juvenil fue aparente en lo presiente estudio, más cuando se controla la variación entre jugadores en la edad cronológica y la maduración biológica