Use of the iliac-outlet and iliac-inlet combined views in percutaneous posterior column retrograde screw fixation

Posterior column fractures are common acetabular injuries. Although displaced fractures require open reduction and fixation, undisplaced patterns may benefit from percutaneous screw fixation. The combination of iliac oblique with inlet and outlet views offers an intuitive and panoramic rendering of the bony corridor into the posterior column; lateral cross table view completes the sequence of fluoroscopic projections. Herein we describe the use of outlet/inlet iliac views and a detailed procedure for percutaneous retrograde posterior column screw fixation

Active control of dielectric singularities in indium-tin-oxides hyperbolic metamaterials

Dielectric singularities (DSs) constitute one of the most exotic features occurring in the effective permittivity of artificial multilayers called hyperbolic metamaterials (HMMs). Associated to DSs, a rich phenomenology arises that justifies the ever-increasing interest profuse by the photonic community in achieving an active control of their properties. As an example, the possibility to “canalize” light down to the nanoscale as well as the capability of HMMs to interact with quantum emitters, placed in their proximity, enhancing their emission rate (Purcell effect), are worth mentioning. HMMs, however, suffer of an intrinsic lack of tunability of its DSs. Several architectures have been proposed to overcome this limit and, among them, the use of graphene outstands. Graphene-based HMMs recently shown outstanding canalization capabilities achieving λ/1660 light collimation. Despite the exceptional performances promised by these structures, stacking graphene/oxide multilayers is still an experimental challenge, especially envisioning electrical gating of all the graphene layers. In this paper, we propose a valid alternative in which indium-tin-oxide (ITO) is used as an electrically tunable metal. Here we have numerically designed and analyzed an ITO/SiO2 based HMM with a tunable canalization wavelength within the range between 1.57 and 2.74 μm. The structure feature light confinement of λ/8.8 (resolution of about 178 nm), self-focusing of the light down to 0.26 μm and Purcell factor of approximately 700. The proposed HMM nanoarchitecture could be potentially used in many applications, such as ultra-fast signal processing, high harmonic generation, lab-on-a-chip nanodevices, bulk plasmonic waveguides in integrated photonic circuits and laser diode collimators.publishedVersionPeer reviewe

La Capanne dei Monti Lepini. Una risorsa per l'etnoarcheologia

Lo studio delle capanne e di altre strutture nei contesti agro-pastorali "moderni" rappresenta uno strumento importante per recuperare informazioni preziose alla comprensione di contesti più antichi. L'obiettivo di questo lavoro è di evidenziare le potenzialità per studi etnoarcheologici del contesto dei Monti Lepini, che ancora oggi è segnato nel paesaggio dai resti di tali strutture, attraverso l'incrocio e la sintesi delle informazioni raccolte nelle diverse ricerche realizzate sul territorio

L’arte rupestre dei Monti Lepini: “vecchi dati” e “nuove prospettive” di ricerca

Le rappresentazioni artistiche, nella più ampia accezione del termine, rappresentano un ambito di ricerca molto particolare negli studi paletnologici sia per il loro alto contenuto simbolico che rende tale aspetto difficilmente inquadrabile da una prospettiva di individuazione del significato, sia per la disomogeneità culturale che si riscontra nei diversi contesti. Se, infatti, specifici ambiti culturali e geografici sono contraddistinti da un forte impulso verso la rappresentazione artistica, fino a permettere di disegnare dei processi storici in cui l’arte diviene narrativa e facilmente correlabile con la sfera sociale, altri ambiti culturali di pari complessità sembrano esserne privi o caratterizzati da attestazioni sporadiche. Infatti, è molto probabile che alcune aree, e di questo si hanno vari esempi in ambito nazionale e internazionale, siano state interessate maggiormente dall’affermazione di una tradizione artistica. I Monti Lepini, e più in generale il Basso Lazio, costituiscono un contesto ad alto potenziale se si tiene presente della presenza di alcuni dei siti che hanno restituito arte rupestre. In quest’ottica il territorio in esame costituisce una delle aree dell’Italia centrale più ad alto potenziale per quanto concerne l’arte rupestre

Near- and Mid-Infrared Graphene-Based Photonic Architectures for Ultrafast and Low-Power Electro-Optical Switching and Ultra-High Resolution Imaging

Confining near-infrared (NIR) and mid-infrared (MIR) radiation (1-10 mu m) at the nanoscale is one of the main challenges in photonics. Thanks to the transparency of silicon in the NIR-MIR range, optoelectronic systems like electro-optical modulators have been broadly designed in this range. However, the trade-off between energy-per-bit consumption and speed still constitutes a significant bottleneck, preventing such a technology to express its full potentialities. Moreover, the harmless nature of NIR radiation makes it ideal for bio-photonic applications. In this work, we theoretically showcase a new kind of electro-optical modulators in the NIR-MIR range that optimize the trade-off between power consumption, switching speed, and light confinement, leveraging on the interplay between graphene and metamaterials. We investigate several configurations among which the one consisting in a SiO2/graphene hyperbolic metamaterial (HMM) outstands. The peculiar multilayered configuration of the HMM allowed one also to minimize the equivalent electrical capacitance to achieve attoJoule electro/optical modulation at about 500 MHz switching speed. This system manifests the so-called dielectric singularity, in correspondence to which an HMM lens with resolving power of lambda/1660 has been designed, allowing to resolve 3 nm-wide objects placed at an interdistance of 3 nm and to overcome the diffraction limit by 3 orders of magnitude. The imaging possibilities opened by such technologies are evident especially in biophotonic applications, where the investigation of biological entities with tailored/broadband-wavelength radiation and nanometer precision is necessary. Moreover, the modulation performances demonstrated by the graphene-based HMM configure it as a promise for ultrafast and low-power opto-electronics applications

O currículo bandeirante: a Proposta Curricular de História no estado de São Paulo, 2008 The bandeirante curriculum: the curricular proposition for History in São Paulo State, 2008

O texto é fruto das discussões do Grupo de Trabalho (GT) da Anpuh - Secção São Paulo, no ano de 2008.¹ Objetiva discutir os impasses criados para a profissionalização do docente de história e para o aprendizado de crianças, jovens e adultos a partir da Proposta Curricular de História do Estado de São Paulo, que faz parte do projeto "São Paulo faz escola", implantada no início do ano letivo de 2008.<br>The text is due to the discussion of An puh's Work Group - São Paulo Section, during the year of 2008. The aim is to discuss the hindrancer regarding the professionalization of the History Pro- fessor and the learning of children, young people and adults having as a point of departure the curricular propo-sition for History in São Paulo State, which is part of the project "São Paulo faz escola", dating from the beginning of 2008