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Asociația Ad Astra a anunțat câștigătorii Premiilor Ad Astra 2022: http://premii.ad-astra.ro/. Proiectul și-a propus identificarea și popularizarea modelelor de succes, a rezultatelor excepționale ale cercetătorilor români din țară și din afara ei.
Publicatii proprii
Contrast enhanced ultrasound and computer tomography diagnosis of solid and mixed pancreatic tumors – analysis of confounders
Aims: The aim of this study was to evaluate the leading causes of discrepancies between imaging studies [contrast enhanced ultrasound (CEUS) and contrast enhanced computer tomography (CECT)] diagnosis and histology in patients presenting to a tertiary referral center with previously detected pancreatic masses by standard abdominal ultrasound. Methods: We performed a prospective longitudinal observational study on 76 patients with pancreatic masses:
Read moreAcoustic Radiation Force Impulse elastography for fibrosis evaluation in patients with chronic hepatitis C: an international multicenter study
Aim: The aim of this international multicenter study was to evaluate the reliability of Acoustic Radiation Force Impulse (ARFI) elastography for predicting fibrosis severity, in patients with chronic hepatitis C. Patients and methods: We compared ARFI to liver biopsy (LB) in 914 patients (10 centers, 5 countries) with chronic hepatitis C. In each patient LB (evaluated according to the METAVIR score) and ARFI measurements were performed (median of
Read morePerformance of Unidimensional Transient Elastography in Staging Chronic Hepatitis C. Results from a Cohort of 1,202 Biopsied Patients from one Single Center
Background & Aims: The current study aimed to establish the liver sti ness (LS) cut-o values and their performance in the prediction of the ¬brosis stage in chronic hepatitis C (CHC) patients, to e¬nd the anthropometric and biochemical factors leading to overestimation of the ¬brosis stage and to analyze the factors leading to the technique failure. Methods: 1,202 consecutive CHC patients were prospectively included in the study. All of them underwent
Read moreLiver stiffness is influenced by a standardized meal in patients with chronic HCV hepatitis at different stages of fibrotic evolution
Transient elastography (TE) is increasingly employed in clinical practice for the noninvasive detection of tissue fibrosis in patients with chronic liver disease (CLD), and particularly chronic hepatitis C virus (HCV)-related hepatitis. The present study was designed to provide a definitive characterization of the ‘‘confounding’’ increase in liver stiffness (LS) following a standardized meal in a consecutive population of 125 patients with
Read moreIdentifying core habitat before it’s too late: The case of Bombina variegata, an internationally endangered amphibian
Impending land-use change, including agricultural intensification, is increasingly threatening biodiversity in traditional rural landscapes. To ensure the persistence of species that are vulnerable to land-use change it is necessary to identify and protect high quality habitat before species start to decline. A potential problem is that many potentially vulnerable species are still widespread in traditional rural landscapes, making it difficult to
Read moreMultiphase equilibrium calculations using the semi-continuous thermodynamics of hydrocarbon mixtures
Natural hydrocarbon mixtures are composed of very many components. Usually, several components are lumped into pseudo-components to reduce the dimensionality of the equilibrium flash calculations. An interesting alternative to lumping is the use of semi-continuous thermodynamics, which enables a better characterization of mixture compositions. Traditionally, in the semi-continuous approach, the feed composition is approximated by a standard distribution
Read moreRobust and efficient Trust-Region based stability analysis and multiphase flash calculations
Multiphase flash calculations and phase stability analysis are central in compositional reservoir and chemical process simulators. For instance, in some simulations, a huge amount of phase equilibrium calculations is required (the most important part of the computational effort). Moreover, a single failure may cause significant error propagations leading to false solutions. Thus, it is imperative that calculation algorithms are efficient and highly
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