186,607 research outputs found
Asymptotic expansion of Crocco solution and Blasius constant
No full textAbstract:
We consider the Crocco equation (the reduction of the Blasius equation). The use of this more simple equation for computation of the Blasius constant leads to some unexpected difficulties, which have been unexplained. We computed the asymptotic expansion of the solution to Crocco equation at its singularity. This expansion was unknown before. We describe the structure of the Riemann surface of the Crocco solution at the singularity. These results were
used for construction of an effective numerical algorithm, which is based on analytical continuation, for computation of the Blasius constant with an arbitrary and guaranteed accuracy. We computed the Blasius constant with a 100 decimal places.Note:
Research direction:Mathematical problems and theory of numerical method
Subsurface inverse scattering problems: quantifying, qualifying and achieving the available information
No full textCombining Multi-Pulse Excitation and Chirp Coding in Contrast Enhanced Echographic Imaging
No full textAuthor-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Combining Multi-Pulse Excitation and Chirp Coding in Contrast-Enhanced Ultrasound Imaging
No full textInnovative imaging tools and devices for clinical monitoring within the EMERALD network
No full textThe Marie Skłodowska-Curie Innovative Training Network EMERALD is a recently started project aimed at progressing the state of the art of microwave imaging devices for medical applications. In this framework, the goal of the project tasks based at CNR-IREA is twofold. First, ad-hoc imaging algorithms tailored to the prototype devices for clinical follow-up and image-guided treatment designed and realized within the network will be developed. Second, a microwave imaging device for monitoring and guiding microwave ablation treatments will be designed, realized and tested. This paper presents the initial research activities carried out by the CNR-IREA team within the EMERALD project
Normal and benign ovarian tissues: estrogen and progesterone receptors using D.C.C. and monoclonal antobody ant-ER methods
No full text(E091994
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Postoperative mortality and morbidity after D2 lymphadenectomy for gastric cancer: A retrospective cohort study
No full textBACKGROUND Surgery for gastric cancer is a complex procedure and lymphadenectomy is often mandatory. Postoperative mortality and morbidity after curative gastric cancer surgery is not insignificant. AIM To evaluate the factors determining mortality and morbidity in a population of patients undergoing R0 resection and D2 lymphadenectomy for gastric cancer. METHODS A retrospective analysis of clinical data and pathological characteristics (age, sex, primary site of the tumor, Lauren histotype, number of positive lymph nodes resected, number of negative lymph nodes resected, and depth of invasion as defined by the standard nomenclature) was conducted in patients with gastric cancer. For each patient we calculated the Kattan's score. We arbitrarily divided the study population of patients into two groups based on the nomogram score (< 100 points or ≥ 100 points). Prespecified subgroups in these analyses were defined according to age (≤ 65 years or > 65 years), and number of lymph nodes retrieved (≤ 35 lymph nodes or > 35 lymph nodes). Uni- and multivariate analysis of clinical and pathological findings were performed to identify the factors affecting postoperative mortality and morbidity. RESULTS One-hundred and eighty-six patients underwent a curative R0 resection with D2 lymphadenectomy. Perioperative mortality rate was 3.8% (7 patients); a higher mortality rate was observed in patients aged > 65 years (P = 0.002) and in N+ patients (P = 0.04). Following univariate analysis, mortality was related to a Kattan's score ≥ 100 points (P = 0.04) and the presence of advanced gastric cancer ( P = 0.03). Morbidity rate was 21.0% (40 patients). Surgical complications were observed in 17 patients (9.1%). A higher incidence of morbidity was observed in patients where more than 35 lymph nodes were harvested (P = 0.0005). CONCLUSION Mortality and morbidity rate are higher in N+ and advanced gastric cancer patients. The removal of more than 35 lymph nodes does not lead to an increase in mortality
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