161,289 research outputs found
A deconvolution procedure for ESR Spectra
No full textQuantitative determination of spin contents from complex spectra requires deconvolution of each peak. There are several ways to perform this task, the more common being the use of a non-linear fit such as the Marquardt-Levenberg algorithm (M-L). However this technique although very powerful and largely diffused fails when the initial set of parameters of the peaks are far from the true ones, i.e. when the sample composition is not a-priori completely known. In this case a new run with different initial values is required. This isn't convenient for an automatic deconvolution procedure. Here a new procedure is presented, based on a genetic algorithm as a first step and a M-L method as the second step. The first step will always work regardless of the initial set of data but the accuracy obtainable is lower compared to the M-L technique. The accuracy is improved by using the parameter obtained in a subsequent algorithm employing the M-L method. However, due to the precision of the genetic algorithm presented here, the second step can sometimes be omitted. Results of some trials both on integral and differential spectra are reported and discussed here
Imaging Ferromagnetic Tracers With An Ac Biosusceptometer
No full textThe aim of this work was to study the feasibility of obtaining images of the distribution of ferromagnetic tracers using an ac biosusceptometer (ACB). The images were generated by mapping the response of the ACB at short distances due to the presence of a ferrite powder dispersed in a planar gel matrix with different shapes. The ACB was scanned over the sample and the voltages generated by the variation in ferrite concentration were sampled. Methods to render and image the distribution of ferromagnetic particles were studied. The generalized Wiener parametric method gave the best results. The system has a potential to be used in functional images of the gastrointestinal tract where a moderate resolution is required. We conclude that this biomagnetic method can be successfully used to generate planar functional images of magnetic particles in the near field. © 2000 American Institute of Physics.71625322538Erol, R.A., Cherian, P., Smallwood, R.H., Brown, B.H., Bardhan, K.D., (1996) Physiol. Meas., 17, pp. A141Ikeya, M., Ishii, H., (1990) J. Magn. Reson., 88, p. 130Smith, C.M., Stevens, A.D., (1994) Br. J. Radiol., 67, p. 1186Roth, B.J., Sepulveda, N.G., Wikswo J.P., Jr., (1989) J. Appl. Phys., 65, p. 361Moreira, M., Murta, L.O., Baffa, O., (1994) Phys. Med. Biol., 39 A, p. 633Miranda, J.R.A., Baffa, O., Oliveira, R.B., Matsuda, N.M., (1992) Med. Phys., 19, p. 445Baffa, O., Oliveira, R.B., Miranda, J.R., Troncon, L.E.A., (1995) Med. Biol. Eng. Comput., 33, p. 353Oliveira, R.B., Baffa, O., Troncon, L.E.A., Miranda, J.R.A., Cambrea, C.R., (1996) Eur. J. Gastroent. Hepatol., 8, p. 491Miranda, J.R.A., Oliveira, R.B., Sousa, P.L., Braga, F.J.H., Baffa, O., (1997) Phys. Med. Biol., 42, p. 1791Daghastanli, N.A., Braga, F.J.H.N., Oliveira, R.B., Baffa, O., (1998) Physiol. Meas., 19, p. 413Forsman, M., Hultin, L., Abrahamsson, H., (1995) Biomagnetism: Fundamental Research and Clinical Applications. Studies in Applied Electromagnetics and Mechanics, 7, p. 739. , edited by C. Baumgartner, L. Deecke, G. Stroink, and S. J. Williamson Elsevier, AmsterdamBasile, M., Neri, M., Carriero, A., Casciardi, S., Comani, S., Del Gratta, C., Donate, L.G., Romani, G.L., (1992) Dig. Dis. Scie., 37, p. 1537Bruno, A.C., (1997) J. Appl. Phys., 82, p. 1Cruvinel, P.E., Cesareo, R., Crestana, S., Mascarenhas, S., (1990) IEEE Trans. Instrum. Meas., 39, p. 745Lim, J.S., (1990) Two-Dimensional Signal and Image Processing, , Prentice-Hall, Englewood Cliffs, NJJ. P. Wikswo, Jr., N. G. Sepulveda, and I. M. Thomas, Ref. 11, p. 789Tan, S., Ma, Y.P., Smith, I.M., Wikswo J.P., Jr., (1996) IEEE Trans. Magn., 32, p. 230Weber, E., (1951) Electromagnetic Fields: Theory and Applications, Mapping of Magnetic Fields, 1. , Wiley, New YorkSpiegel, M.R., (1990) Mathematical Handbook of Formulas and Tables, , McGraw-Hill, New YorkBruno, A.C., Costa Ribeiro, P., Von Der Wied, J.P., Symko, O., (1986) J. Appl. Phys., 59, p. 2584Vrba, J., Fife, A.A., Burbank, M., Weinberg, H., Bricket, P.A., (1982) Can. J. Phys., 60, p. 106
La condotta di reclutamento e di favoreggiamento della prostituzione nell’ambito del libero esercizio di prestazioni sessuali. A proposito della sentenza n. 141 del 2019 della Corte costituzionale (caso Tarantini)
No full textNell’ambito del noto caso Tarantini, la Corte d’Appello di Bari ha sollevato questione di legittimità costituzionale dell’art. 3, co. 1, nn. 4) e 8), della legge 20 febbraio 1958, n. 75 (c.d. Legge Merlin), nella parte in cui si attribuisce rilevanza penale alla condotta di reclutamento e favoreggiamento della prostituzione “volontariamente e consapevolmente esercitata”, ravvisando, inter alia, una possibile violazione del principio di necessaria offensività, considerato (già) nella sua dimensione di offensività “in astratto”.
Il Giudice delle Leggi ha ritenuto, tuttavia, non fondate le eccezioni in quanto «anche nell’attuale momento storico, quando pure non si sia al cospetto di vere e proprie forme di prostituzione forzata, la scelta di “vendere sesso” trova alla sua radice, nella larghissima maggioranza dei casi, fattori che condizionano e limitano la libertà di autodeterminazione dell’individuo».
La Consulta, inoltre, nel riaffermare la costituzionalità delle scelte di criminalizzazione in materia di prostituzione, sembra valorizzare una nozione oggettiva (o impersonale) del bene “dignità”
Limiti spaziali di validità della responsabilità "da reato" degli enti: applicabilità del d.lgs. n. 231/2001 all'ente "italiano" per reato commesso all'estero e all'ente "straniero" per reato commesso in Italia
No full textIl presente contributo intende soffermarsi su due aspetti, speculari, che vengono in rilievo nella dimensione internazionale del d.lgs. n. 231 del 2001. Da un lato l’ipotesi, disciplinata all’art. 4, in cui il reato da cui dipende la responsabilità “amministrativa” dell’ente, posto in essere nel suo interesse o vantaggio da uno dei soggetti di cui all’art. 5 (soggetto apicale o sottoposto all’altrui direzione), sia commesso all’estero; dall’altro quella, relegata ai margini della “parte generale” del d.lgs. n. 231/01, in cui il reato-presupposto sia commesso in Italia, nell’interesse o vantaggio di ente “straniero”: dunque, la responsabilità delle imprese italiane per reati commessi all’estero, ove queste operino nelle più diverse forme e, per altro verso, l’eventualità di un’elusione della disciplina del d.lgs. 231/2001 da parte di imprese (anche) non aventi succursali in Italia, ma operanti nel territorio nazionale
ESR dating of a toxodon tooth from a Brazilian karstic cave
No full textA pre-molar of a Toxodon platensis (sp), a large mammal that inhabited the forests of Southeast Brazil during quaternary times, was dated by electron spin resonance (ESR). Enamel and dentine were separated giving the following archeological doses (AD): (4.0 ± 0.8) and (11 ± 2) Gy, respectively. This difference was explained by the higher content of Uranium in dentine (25.1 ± 0.3) ppm as compared to enamel (0.37 ± 0.03) ppm. Taking account of the internal dose contribution to the AD, the age obtained is (6.7 ± 1.3) ky BP for dentine and (5.0 ± 1.6) ky BP for enamel
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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
Larry O. Spencer, Conference Author Presentation
No full textGen. Larry O. Spencer, USAF (Ret.), author of Dark Horse: A Journey from the Horseshoe to the Pentago
ESR dating of an ancient goat tooth from Nuoro, Sardinia, Italy
No full textThe dating of fossil teeth of an ancient goat (Nesogoral melonii) using the electron spin resonance (ESR) technique is reported. This animal was found in the fossiliferous site at Orosei (Nuoro, Sardinia, Italy) and was endemic in the region. Molar teeth were cleaned and enamel was completely removed from dentine. Enamel was irradiated with a 60Co gamma source and measured with an ESR spectrometer (X-band) to obtain the signal vs. dose curve and fitted with an exponential function. The archeological dose obtained by the fitting was 211 ± 34 Gy. Uranium and thorium concentrations were determined by neutron activation analysis. With the software ROSY the age estimates were 195 ± 30 ky for early uptake, 247 ± 40 ky for linear uptake and 243 ± 40 ky for a combination of uptake processes
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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