Near-field imaging of single walled carbon nanotubes emitting in the telecom wavelength range

International audienceHybrid systems based on carbon nanotubes emitting in the telecom wavelength range and Si-photonic platforms are promising candidates for developing integrated photonic circuits. Here, we consider semiconducting single walled carbon nanotubes (s-SWNTs) emitting around 1300 nm or 1550 nm wavelength. The nanotubes are deposited on quartz substrate for mapping their photoluminescence in hyperspectral near-field microscopy. This method allows for a sub-wavelength resolution in detecting the spatial distribution of the emission of single s-SWNTs at room temperature. Optical signature delocalized over several micrometers is observed, thus denoting the high quality of the produced carbon nanotubes on a wide range of tube diameters. Noteworthy, the presence of both nanotube bundles and distinct s-SWNT chiralities is uncovered

"Delirium Day": A nationwide point prevalence study of delirium in older hospitalized patients using an easy standardized diagnostic tool

Background: To date, delirium prevalence in adult acute hospital populations has been estimated generally from pooled findings of single-center studies and/or among specific patient populations. Furthermore, the number of participants in these studies has not exceeded a few hundred. To overcome these limitations, we have determined, in a multicenter study, the prevalence of delirium over a single day among a large population of patients admitted to acute and rehabilitation hospital wards in Italy. Methods: This is a point prevalence study (called "Delirium Day") including 1867 older patients (aged 65 years or more) across 108 acute and 12 rehabilitation wards in Italian hospitals. Delirium was assessed on the same day in all patients using the 4AT, a validated and briefly administered tool which does not require training. We also collected data regarding motoric subtypes of delirium, functional and nutritional status, dementia, comorbidity, medications, feeding tubes, peripheral venous and urinary catheters, and physical restraints. Results: The mean sample age was 82.0 \ub1 7.5 years (58 % female). Overall, 429 patients (22.9 %) had delirium. Hypoactive was the commonest subtype (132/344 patients, 38.5 %), followed by mixed, hyperactive, and nonmotoric delirium. The prevalence was highest in Neurology (28.5 %) and Geriatrics (24.7 %), lowest in Rehabilitation (14.0 %), and intermediate in Orthopedic (20.6 %) and Internal Medicine wards (21.4 %). In a multivariable logistic regression, age (odds ratio [OR] 1.03, 95 % confidence interval [CI] 1.01-1.05), Activities of Daily Living dependence (OR 1.19, 95 % CI 1.12-1.27), dementia (OR 3.25, 95 % CI 2.41-4.38), malnutrition (OR 2.01, 95 % CI 1.29-3.14), and use of antipsychotics (OR 2.03, 95 % CI 1.45-2.82), feeding tubes (OR 2.51, 95 % CI 1.11-5.66), peripheral venous catheters (OR 1.41, 95 % CI 1.06-1.87), urinary catheters (OR 1.73, 95 % CI 1.30-2.29), and physical restraints (OR 1.84, 95 % CI 1.40-2.40) were associated with delirium. Admission to Neurology wards was also associated with delirium (OR 2.00, 95 % CI 1.29-3.14), while admission to other settings was not. Conclusions: Delirium occurred in more than one out of five patients in acute and rehabilitation hospital wards. Prevalence was highest in Neurology and lowest in Rehabilitation divisions. The "Delirium Day" project might become a useful method to assess delirium across hospital settings and a benchmarking platform for future surveys

Nurses' perceptions of aids and obstacles to the provision of optimal end of life care in ICU

Contains fulltext : 172380.pdf (publisher's version ) (Open Access

Integration of carbon nanotubes in silicon resonators

International audienceThis paper reports on recent results on the integration of carbon nanotubes on the silicon photonic platform. Light coupling from carbon nanotubes in a fully integrated silicon resonator will be presented

Carbon Nanotubes Integration on Silicon

International audienceOptical interconnects are expected to overcome the copper link bottlenecks. Amongthe different developed technologies, silicon photonics becomes one of the preferred solutions. Indeed,due to its compatibility with the CMOS platform, silicon photonics is considered as aviable solution for the development of the future generation photonic interconnects. However,the on-chip integration of all photonic and optoelectronic building blocks (sources, modulatorsand detectors. . . ) on the silicon platform is very complex and is not cost-effective due to thevarious materials used: Ge for detection, Si for waveguiding and modulators and III-V for lasing.We propose here to use carbon nanotubes (CNTs) integrated into silicon photonics for the developmentof all optoelectronic devices. Indeed, CNTs are nanomaterials of particular interest inphotonics thanks to their fundamental optical properties including near-IR luminescence, Starkeffect, Kerr effect and absorption. In consequence, CNTs have the ability to emit, modulateand detect light in the wavelength range of the silicon transparency. Furthermore, they are alsoconsidered as an electronic compatible material thanks to the recent advances in nanoelectronicsbased on CNTs.Here, we report on the study of the light emission coupling from CNTs into optical resonatorsimplemented on the silicon-on-insulator (SOI) platform including ring resonators, nano-beamcavities, micro-disks. . . . A theoretical and experimental analysis of the light interaction of CNTswith micro-ring resonators based on slot waveguides and slot photonic crystal heterostructurecavities will be presented

Integration of carbon nanotubes in silicon resonators

International audienceThis paper reports on recent results on the integration of carbon nanotubes on the silicon photonic platform. Light coupling from carbon nanotubes in a fully integrated silicon resonator will be presented

Generazioni disuguali. Le condizioni di vita dei giovani di ieri e di oggi: un confronto

\uc8 percezione diffusa che, per la prima volta dalla seconda guerra mondiale, i giovani subiscano un arretramento nelle condizioni di vita e, ancor pi\uf9, nelle prospettive future. Sulla gravit\ue0 e sulle cause di questa situazione si confrontano opinioni diverse. Il volume fornisce articolate risposte, affrontando \u2013 da prospettive nuove rispetto a quelle fin qui esplorate \u2013 una pluralit\ue0 di aspetti dell\u2019esistenza giovanile (scolarit\ue0, lavoro, reddito, formazione della famiglia, migrazioni interne e verso l\u2019estero, mobilit\ue0 sociale ed economica). Non vengono considerati solo i giovani di oggi, ma anche i giovani di ieri, cos\uec da capire se davvero, e per quali ragioni, quelli stiano peggio di questi. Sono altres\uec valutati gli effetti delle politiche pubbliche e delle scelte di bilancio degli ultimi cinquant\u2019anni sulle condizioni di vita delle nuove generazioni, passate e presenti. Il volume si caratterizza per l\u2019ampiezza degli argomenti e per il rigore delle analisi, frutto di un\u2019organica collaborazione tra economisti, sociologi e statistici nell\u2019ambito del progetto pluriennale di ricerca \uabOsservatorio sulle disuguaglianze sociali (Ods)\ubb