101,918 research outputs found
Automatic System for Wind Turbine Testing
No full textAn innovative electronic system for testing the performance of wind turbines is presented. The main goal of the system is to increase the accuracy in the measurements of torque and speed for each steady-state point of the turbine characteristic power curve. Another useful advantage provided by the electronic control is given by the possibility of fine tuning the load in order to obtain a large number of steady state experimental points describing the characteristic curve of the turbine. Moreover, the system is suitable for integration into an automatic data acquisition and control system. In the paper the main characteristics of the electronic system are described and compared with a traditional system. This electronic control system is used for testing a small Vertical Axis Wind Turbine in a wind tunnel. The wind turbine is directly coupled to a direct current electric generator, and a chopper, electronically controlled by means of a Pulse Width Modulator, is used to supply the circuit. The electric generator is used for braking the wind turbine at various speeds during the performance test. The experimental results obtained through the proposed system are presented and discussed.</jats:p
MC1R gene: comparison between different farm animal species
No full textIl gene MC1R: confronto fra diverse specie animali di interesse zootecnico. Negli animali di interesse zootecnico, il polimorfismo del gene MC1R coinvolto nella pigmentazione è stato studiato a livello molecolare soltanto nell’ultimo decennio. Si sono confrontate descrizioni fenotipiche e polimorfismi del gene MC1R in alcune razze bovine (Rendena, Bruna, Cabannina, Ottonese-Varzese e Pezzata Rossa) e nel cavallo (62 animali). Tutti gli animali feomelanici sono portatori delle mutazioni recessive allo stato omozigote indipendentemente dalla tonalità del mantello. I cavalli neri sono portatori dell’allele selvatico del gene MC1R e della mutazione recessiva del gene ASIP allo stato omozigote. Nei cavalli bai e nelle altre razze bovine studiate è presente, almeno allo stato eterozigote, l’allele selvatico. Nella Bruna e nella Cabannina è presente anche l’allele E1. Nel gene MC1R, sequenziato in capre di razza Bionda dell’Adamello e Nera di Verzasca, si è evidenziata l’unica mutazione descritta in letteratura. I risultati sono stati confrontati con le informazioni disponibili nella specie murina e umana.Coat colour genes in farm animals have only been studied at molecular level over the last ten years, starting with Klungland et al. in 1995. Among the genes involved in pigmentation, MC1R, previously known as Extension locus, revealed polymorphisms related to red and black coat colour in different farm animal species. More exactly, the MelanoCortin-1 Receptor (MC1R) gene, specifically expressed in melanocytes, encodes for the homonymous G-protein coupled receptor involved in the regulation of the type of melanin synthesized. Melanocytes produce in fact two different types of melanins: the black or brown eumelanin and the yellow or red pheomelanin. The hair distribution of eu- and pheomelanins depends on the activity of MC1R, which is normally modulated by response to the melanocortin hormone, antagonized by the action of Agouti protein encoded by the ASIP gene. We previously studied the MC1R polymorphisms in some cattle reared in Italy (Crepaldi et al., 2003) and we now present the data on MC1R in other Italian cattle breeds, horses and goats. The aim of this work is to compare the pigmentary phenotypes and causative MC1R mutations in different farm animals and model species, such as mouse and human, in order to highlight differences and similarities between phenotypes and MC1R polymorphisms. The relationship between phenotypes and Agouti locus is also discussed
P16INK4a as a progression/regression tumour marker in LSIL cervix lesions: Our clinical experience
No full textPurpose of investigation: The aim of this prospective study was the evaluation of low-grade intraepithelial lesion (LSIL) lesions evolvement in woman with evidence of high risk HPV infection and p16 INK4a negative expression. Materials and Methods: 150 women with cytological diagnosis of LSIL were selected to be underwent to three years of follow-up consisting in smear test, colposcopy, and protein p16 INK4a investigation every six months and HPV-test every 12 months. Result: Final follow-up showed 45 cases of spontaneous lesion regression and 42 cases of persistence with absence of protein p16 INK4a in all of them. There were three cases of disease progression to CIN2, two at 18-month follow-up and one at last follow-up. Disease progression was characterized of p16 INK4a expression. Conclusion: p16 INK4a should help to identify which LSIL cases are inclined to the progression of the disease and focalize which patients are eligible for specific treatment
The spectral variations of MWC 314
No full textNew spectra of MWC314 are presented; they indicate that the V/R emission line flux ratios show signs of varying in an opposite way to the absorption line radial velocities. The latter appear to be due to apparently non-periodic pulsations, perhaps in strange modes
Diagnosis, antenatal surveillance and management of prolonged pregnancy: Current perspectives
No full textProlonged pregnancy is defined as a pregnancy that extends beyond 42 weeks of gestation (294 days) from the first day of the last normal menstrual period. An accurate estimation of the ‘natural’ incidence of prolonged pregnancy would require meticulous early pregnancy dating. The use of ultrasound to establish gestational age reduces the number of pregnancies that are classified as prolonged. Prolonged pregnancy is associated with an increased perinatal mortality and morbidity in pregnancies which appear to be otherwise low risk. Postterm births are easily preventable by intervening to deliver with the use of induction of labor. Thus, this potentially problematic condition deserves further attention and careful consideration. The focus of this article is to review and challenge some current concepts surrounding the diagnosis and management of prolonged pregnancy. We outline how to identify those women with prolonged pregnancy and which is the appropriate moment to start monitoring the fetal wellbeing. Finally we address the question of benefits and hazards of induction of labor strategies
Bibliographie Hilarion G. Petzold 1958 – 2009 mit Anhang als Einführung
No full textDieses Archiv enthält die Gesamtbibliographie der Werke des Autors nebst einiger Texte „Über H. G. Petzold“ im Schlussteil der Bibliographie sowie einen Anhang mit einer Einführung in die Architektur des Werkes in seinem wissenslogischen Aufbau als Ausarbeitung seines „Tree of Science Modells“ (2007).This archive contains the complete bibliography of the author and some texts about H. G. Petzold, moreover an epilogue with an introduction to the architecture of the works in its epistemological structure and composition and as an elaborations of Petzold’s „Tree of Science Modell (2007).https://www.fpi-publikation.de/polyloge/01-2009-petzold-h-g-gesamtbibliographie-h-g-petzold-1958-2009-updating-november2009/peerReviewedpublishedVersio
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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3346: Samuel G. Freedman, author, 2013
No full textPhotograph of author Samuel G. Freedman, at NT Daily Slash meeting in the Mayborn School of Journalism at UNT
Cellular and biochemical mechanisms, risk factors and management of preterm birth: State of the art
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