177,610 research outputs found
The influence of working parameters on the response of a capacitive sensor used in-process for the measurement of tool wear
No full textIn a previous research work, a no contact capacitive sensor was obtained which could check superficial characteristics of workpieces during working. This sensor can relate variations of capacity to superficial finishing of the workpiece directly. The present study aims at finding a method for interfacing the capacitive sensor to a system of data acquisition and for deciding the substitution of the tool, automatically. It has been necessary to value the influence of cutting parameters on sensor's response in order to find the threshold value, characterizing by itself an anomalous working state owed to regular or irregular tool wear. © 1998 Elsevier Science Ltd. All rights reserved
Direct cell conversion of somatic cells into dopamine neurons: achievements and perspectives
No full textEvaluation of vascular patterns of cervical lymph nodes with power Doppler sonography
No full textPower Doppler sonography was used to evaluate 105 benign and malignant cervical lymph nodes in 60 patients. Three main vascular patterns were identified: type I (single vascular pole), type II (hypertrophic vascular pole), and type III (mainly peripheral vascularity). The first one was related to chronic inflammation (sensitivity 85%, specificity 90%); the second and third were related, to a lesser extent, to acute inflammation and neoplasm (sensitivity 68% and 55%, specificity 47% and 91%, respectively). The authors conclude that the sensitivity and specificity of power Doppler sonography cannot compete with those of fine-needle aspiration biopsy in the diagnosis of adenopathy
Laparoscopic Staging of Abdominal Malignancies
No full textObjectives: To assess the efficacy of laparoscopic evaluation of abdominal malignancies in terms of mortality, morbidity, sensitivity, specificity.
Methods: A prospective randomized study on 62 patients affected by different malignant neoplasms whose tumor staging needed a confirmation by explorative laparotomy as requested from oncologists. Tumor histology was available in 22 cases of ovarian cancers previously treated and requiring a second look, in 12 operated pancreatic cancers and in 2 cases of ampullary malignancies resected via a Whipple procedure. The remaining
cases were explored on imaging basis. 30 patients underwent a standard explorative laparotomy, the remainders were explored by laparoscopy. Both groups of patients received multiple biopsies.
Results: No difference was found in terms of sensitivity or specificity (p>0.05) Chi2) between laparoscopy and laparotomy regarding the specimens final histology and thus to reach a diagnosis. Morbidity was significantly lower (p< 0:05 Chi2) in the laparoscopic group. No peroperative deaths occurred.
Conclusions: Laparoscopy may avoid an unnecessary laparotomy whenever a diagnostic confirmation is required. Laparoscopy may play a key role both to determine the neoplasm operability or the need for adjuvant therapies. Especially immuno- compromised cancer patients may receive an advantage in avoiding, if requested, a staging laparotomy
Characterization of a Bronze Based Powder for Direct Selective Laser Sintering of Metals
No full textElectrode discharge for plasma surface treatment of polymeric materials
No full textA cold plasma prototype electrode discharge apparatus to perform polymer surface treatment is described. The plasma generator, operating with oxygen and/or nitrogen, works in glow regime at low pressure (10 mbar) and at relatively high gas flow rate, in the 110-340 1/h range. The effects of treatments on PET monopolyester and glass fibre reinforced plastics (GFRP) surfaces are analysed. The treatment points out, in all operating conditions, an increase of both wettability (PET) and adhesivity (GFRP). The treatment times obtained are one order of magnitude lower than those of the traditional treatment apparatus
The promotional english(es) of university websites
No full textThis paper examines the stylistic evolution of university websites in the light of the current debate on globalization and the marketization of institutional services
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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