Search results for "Sound"
showing 10 items of 1845 documents
Towards a unified analysis of brain maturation and aging across the entire lifespan: A MRI analysis
2017
Previous literature about the structural characterization of the human cerebellum is related to the context of a specific pathology or focused in a restricted age range. In fact, studies about the cerebellum maturation across the lifespan are scarce and most of them considered the cerebellum as a whole without investigating each lobule. This lack of study can be explained by the lack of both accurate segmentation methods and data availability. Fortunately, during the last years, several cerebellum segmentation methods have been developed and many databases comprising subjects of different ages have been made publically available. This fact opens an opportunity window to obtain a more extens…
Three-dimensional color power angiography of an aneurysm of the vein of Galen
2000
I festeggiamenti per le incoronazioni a Palermo di Vittorio Amedeo II (1713) e Carlo III (1735): musica, spettacolo e cerimonia
2018
Le entrate e le rispettive incoronazioni a Palermo di Vittorio Amedeo II di Savoia e Carlo III di Borbone sono state analizzate sotto diversi punti di vista. Tuttavia gli aspetti musicali sono stati finora poco considerati, se non a margine di studi più generali sulla vita musicale palermitana. Il presente contributo è riservato in modo specifico alla cornice sonora dei due eventi, dimostrando come questa costituisse un elemento essenziale al funzionamento della festa e al soddisfacimento dei suoi scopi. Le descrizioni e le testimonianze iconografiche propongono spunti di indagine sulle modalità di esecuzione e sui rapporti con il contesto celebrativo, fornendo anche informazioni sulle occa…
Darstellung des Blutflusses in den Gebärmutterarterien und im normalen sowie malignen Gebärmuttergewebe mittels einer 2D-Multiphasen-Tagging-Technik
1998
PURPOSE The aim of this pilot study was to evaluate a 2D-STAR technique as a non contrast-enhanced approach to demonstrate the uterine artery and its branches and to assess the cervical uterine blood flow in healthy volunteers and in patients with advanced uterine cervical carcinoma. MATERIALS AND METHODS Seven healthy volunteers (mean age, 29 years) and twenty-two patients (mean age, 52 years) with advanced cancer of the uterine cervix (FIGO IIB-IVA) were prospectively examined by 2D-STAR imaging at different inversion delay times (300 ms-1900 ms) which showed the passage of a blood bolus through normal and malignant tissue of the uterine cervix. RESULTS The uterine artery was well visuali…
EP273 A new integrated pre-surgical diagnostic algorithm to define the local extent of disease in women with cervical cancer
2019
Introduction/Background Survival of patients with cervical cancer is strongly associated with the local extent of the primary disease. For this reason, the new FIGO staging system has given greater importance to instrumental investigations in the pre-surgical evaluation. The objective of this study is to develop an integrated diagnostic algorithm, including ultrasound (US), magnetic resonance imaging (MRI) and clinical examination under anaesthesia (CEUA), to better define the local extent of disease in patients with newly diagnosed cervical cancer, using histology as the referring gold standard. Methodology Patients with biopsy proven cervical cancer submitted to primary surgery from Janua…
Channel Tracking Guidewire and Technique for Retrograde Approach
2020
Evaluation of the collateral circulation is critical for determining the feasibility of the retrograde approach. When assessing collateral channels it is of paramount importance to take time and review the previous angiogram carefully, for multiple potential collateral pathways, as the predominant collateral may change over time prior to the procedure. Careful review of collaterals prior to the procedure can reduce contrast and radiation dose as well as the duration of the procedure.Retrograde access to the distal vessel can be achieved via septal collaterals, epicardial collaterals (atrial channel), or (patent or occluded) coronary bypass grafts. Generally septals are used more often 65–70…
Stéréophonie et littérature : résonnance et reverbération dans les chansons de gestes et romans des XIIe et XIIIe siècles
2016
The chansons de geste and chivalric romances from the 12th and 13th centuries are a faithful testimony of the reality of their time, and sensory perceptions are among these testimonies. The written word provides not only descriptive and objective information, but also the impressions perceived and conveyed by the author, which are the sensations the reader has to get acquainted with in order to make the story their own. Mentions to sound effects and the sound features of a particular space are remarkable, and a compilation of these references from various texts allows us to study the sounds, resonances, and spaces through which the sound event gains prominence in the narrative. These includ…
A joint action of deep eutectic solvents and ultrasound to promote Diels−Alder reaction in a sustainable way
2020
The need to reduce environmental impact of chemical processes has induced a surge of attention in the choice of solvent and methodologies to carry them out. In this context, we studied the Diels−Alder reaction using N-ethylmaleimide as dienophile and changing the nature of the diene in deep eutectic solvents (DES) under both conventional heating and ultrasonic activation. DES obtained by the combination of different hydrogen bond acceptors and donors allowed assessing the role played by solvent nature. DES proved suitable solvent media for the target reaction, allowing higher yields and faster reactions compared to conventional organic solvents. The trend of yields, both in silent and under…
Modeling of the Low-Frequency Noise in Thermal Lens Spectrometry
1998
The low-frequency noise observed in thermal lens spectrometry (TLS) can be modeled by assuming that the heated region, constituted by the thermal lens gradient and associated convective stream, behaves as a weakly damped harmonic oscillator with a natural frequency, vo, which is forced to move at an externally imposed pump frequency, vp. Out-of-phase lower-frequency oscillations of the TLS signal can be produced both by transient events, such as the beginning of the TLS experiment and small changes in the pump beam stability, and by drift of boundary conditions, such as the temperature of the surroundings. A model is developed and checked using 1-(2-pyridylazo)-2-napthol (PAN) solutions in …