Search results for "Light"
showing 10 items of 3575 documents
Luce per rivivere… Alla scoperta di Baetulo, Catalogna / Light to relive…Discovering Baetulo, Catalonia
2013
L'illuminazione artificiale deve rientrare a pieno titolo nelle competenze di quanti siano impegnati ad affrontare la questione della valorizzazione dei siti archeologici, specialmente nell’area mediterranea. Negli ultimi decenni, infatti, abbiamo assistito a una progressiva apertura e proiezione verso il mondo esterno di quelli che possiamo definire i “luoghi della memoria”. Artificial lighting needs to return with full titles in the expertize of those committed to tackle the issue of enriching archeological sites, especially in the mediterranean area. As a matter of fact, in the last ten years, we have aided an openminded progression towards the external world of those who we can call “pl…
Luce per comunicare. I colori in tre importanti siti archeologici della Catalogna
2011
La volontà di restituire alla collettività la lettura storica della città del passato ha fatto sì che nei siti archeologici della Catalogna la luce fosse utilizzata per consentire ai cittadini di riappropriarsi della propria identità e ai turisti di comprenderne la storia. Ai visitatori tutti, in generale, è data la possibilità di godere delle rovine delle città, non solo per quanto riguarda il valore estetico aggiunto, ma anche, e soprattutto, per l’aspetto didattico del tipo d’intervento realizzato.
On the distribution of lightning current among interconnected grounding systems in medium voltage grids
2018
This paper presents the results of a first investigation on the effects of lightning stroke on medium voltage installations' grounding systems, interconnected with the metal shields of the Medium Voltage (MV) distribution grid cables or with bare buried copper ropes. The study enables us to evaluate the distribution of the lightning current among interconnected ground electrodes in order to estimate if the interconnection, usually created to reduce ground potential rise during a single-line-to-ground fault, can give place to dangerous situations far from the installation hit by the lightning stroke. Four different case studies of direct lightning stroke are presented and discussed: (1) two …
Purcell Enhancement and Wavelength Shift of Emitted Light by CsPbI3 Perovskite Nanocrystals Coupled to Hyperbolic Metamaterials
2020
Manipulation of the exciton emission rate in nanocrystals of lead halide perovskites (LHPs) was demonstrated by means of coupling of excitons with a hyperbolic metamaterial (HMM) consisting of alternating thin metal (Ag) and dielectric (LiF) layers. Such a coupling is found to induce an increase of the exciton radiative recombination rate by more than a factor of three due to the Purcell effect when the distance between the quantum emitter and HMM is nominally as small as 10 nm, which coincides well with the results of our theoretical analysis. Besides, an effect of the coupling-induced long wavelength shift of the exciton emission spectrum is detected and modeled. These results can be of i…
Combined effect of nutrient and flashing light frequency for a biochemical composition shift in Nannochloropsis gaditana grown in a quasi-isoactinic …
2020
Artificial lighting may be an interesting opportunity for the cultivation of microalgae as an alternative to natural sunlight. In particular, light emitting diodes (LEDs) can be employed to tailor the lighting to the microalgal culture in a controlled mode in order to create flashing light. In order to establish the effect of the flashing frequency on growth and biochemical composition of a model microalga, a quasi-isoactinic reactor, in which the light distribution is almost homogeneous, was set up. In this work, it was employed for the cultivation of the heterokont Nannochloropsis gaditana in two growth media with limiting and nonlimiting nutrients. The combined effect of nutrient concent…
Apoptotic-like Leishmania exploit the host´s autophagy machinery to reduce T-cell-mediated parasite elimination
2015
Apoptosis is a well-defined cellular process in which a cell dies, characterized by cell shrinkage and DNA fragmentation. In parasites like Leishmania, the process of apoptosis-like cell death has been described. Moreover upon infection, the apoptotic-like population is essential for disease development, in part by silencing host phagocytes. Nevertheless, the exact mechanism of how apoptosis in unicellular organisms may support infectivity remains unclear. Therefore we investigated the fate of apoptotic-like Leishmania parasites in human host macrophages. Our data showed--in contrast to viable parasites--that apoptotic-like parasites enter an LC3(+), autophagy-like compartment. The compartm…
Cartographie de la pollution lumineuse zénithale en Bourgogne à partir de données de population et d'occupation du sol
2007
L'étude a pour but de fournir une première cartographie très simple de la pollution lumineuse sous SIG afin de faciliter l'interprétation géographique et, par la suite, la mise en relation avec d'autres facteurs. Bien sûr, un passage vers un modèle prédictif devient nécessaire si l'outil se destine à être une aide décisionnelle ou un outil de recherche ayant pour but d'analyser les conséquences des changements de certains de ses paramètres. Ainsi, un tel modèle pourra servir à évaluer et analyser les conséquences de la pollution lumineuse générée par la construction d'un nouveau quartier résidentiel, d'une zone indus‐ trielle, de nouvelles infrastructures routières.
da luce a Luce
2012
La luce, come alternativo elemento al ‘fuoco’ insieme a ‘terra’, ‘vento’ e ‘acqua’ costituiscono i punti di riflessione nel cui intorno indagano le ricerche e le azioni dell’INBAR -Istituto Nazionale di BioARchitettura- che con il primo BioLaboratorio dal titolo “Catturiamo il Sole”, tenutosi presso Alcamo, 12.10.2012, ha visto la partecipazione di vari studiosi ed esperti di settore, moderati dal Presidente del Comitato Scientifico INBAR Sezione di Trapani, Prof. G. De Giovanni. In particolare, il contributo di E. W. Angelico ha inteso indagare sulle varie forme della luce: fra naturale e artificiale, diretta e indiretta. L’Architettura si dota spesso di ogni azione volta a porre in giusta…
Retinal Straylight Before and After Penetrating Keratoplasty in an Eye with a Post-Herpetic Corneal Scar
2008
Objetivo: Estudio in vivo de la luz dispersa que alcanza la retina en un paciente antes y despues de someterse a una queratoplastia penetrante (o sus siglas en ingles, PKP). Metodos: En un paciente varon de 65 anos con una ulcera corneal herpetica se midio la proporcion de luz dispersa que alcanza la retina tanto antes como despues de una PKP, utilizando para ello un metodo psicometrico denominado "de comparacion por compensacion" («Compensation comparison method», C-Quant straylightmeter, Oculus GmbH, Alemania). Resultados: La cantidad de luz dispersa que alcanza la retina medida antes de la cirugia fue elevada en comparacion con los valores obtenidos en estudios previos en sujetos normale…
Efficacy of the laser at low intensity on primary burning oral syndrome: a systematic review.
2020
Background Primary burning mouth syndrome (BMS) is a chronic clinical condition of idiopathic mainly characterized by pain and a burning sensation in the oral cavity. The application of laser at low intensity therapy is a treatment option. This systematic review evaluated the efficacy of laser therapy in treating symptoms of burning mouth syndrome. Material and Methods The study was formulated according to the PRISMA and Cochrane guidelines. Seven databases were used as primary sources of research. Only randomized controlled clinical trials were included. The efficacy of the therapy was estimated comparing the values of the visual and numerical scales of pain before and after laser treatmen…