124,827 research outputs found
Surface Recognition of His-Purkinje activity by one-beat analysis wavelet transform system in the evaluation of type 1 second-degree AV block
No full textTraditional beat-to-beat recording (TBR), also if
overcomes these limitations, means high level of noise that
at moment is eliminated by Fourier based digital filters. But these
filters may produce a phase shift of atrial signals and, at time, may cause ringing at the end of atrial waveform.
Therefore we propose Wavelet Transform System (WTS) of one-beat signal as method to overcome these limitations
Surface recognition of His-Purkinje activity by one-beat analysis wavelet transform system.
No full textSurface Recognition of His-Purkinje activity can be analyzed by signal averaging or by beat to beat recording of High Resolution ECG. However, these techniques have several limitations connected to the trigger mechanism and to Fourier based digital filters. Therefore, we propose Wavelet transform (WT) of one beat signal as methods for overcoming these limitations
Study of supplemental oral l-Arginine in Hypertensives treated with enalapril + hydrochlorothiazide
No full textSpectrophotometric Determination Of Hexamethylenetetramine (hmt) In Pharmaceutical Preparations Using Chromotropic Acid And Microwave Oven [determinação Espectrofotométrica De Hexametilenotetramina (hmt) Em Medicamentos, Utilizando ácido Cromotrópico E Forno De Micro-ondas]
No full textThis paper proposes a methodology for spectrophotometric determination of hexamethylenetetramine (HMT) by using chromotropic acid in a phosphoric acid media employing a domestic microwave oven as a source of heating. The reddish-purple soluble product is quantitatively formed after 30 s of irradiation and obeys the Beeŕs law in the range between 0.1-1.2 mg L-1 HMT (r = 0.99925). The method was applied successfully in commercial pharmaceutical preparations containing dyes in their composition. The results showed that the method proposed is feasible for simplicity, speed, low cost, precision and accuracy when compared with United States Pharmacopeia official method.32924582463Nickel, J.C., (2005) J. Urol., 173, p. 21Kaszycki, P., Koloczek, H., (2002) Biodegradation, 13, p. 91Kirk, R.E., Othmer, D.F., Encyclopedia of chemical technology (1951) The Interscience Encyclopedia, , New YorkSharma, S.P., Lahiri, S.C., (2008) J. Indian Chem. Soc., 85, p. 273Turi, E.A., (1981) Thermal Caracterization of Polymeric Materials, , Academic Press: OrlandoMadsen, G.L., Jaselkis, B., (1992) Analyst, 117, p. 1785Tomcik, P., Mrafkova, L., Bustin, D., (2003) Microchim. Acta, 141, p. 69Dzyadevych, S.V., Arkhypova, V.N., Korpan, Y.I., El'skaya, A.V., Soldatkin, A.P., Jaffrezic-Renault, N., Martelet, C., (2001) Anal. Chim. Acta, 445, p. 47Korpan, Y.I., Gonchar, M.V., Sibirny, A.A., Martelet, C., El'skaya, A.V., Gibson, T.D., Soldatkin, A.P., (2000) Biosens. Bioelectron., 15, p. 77Burini, G., Coli, R., (2004) Anal. Chim. Acta, 511, p. 155Pérez-Ruiz, T., Martínez-Lozano, C., Fenoll, T.V., (2003) J. Anal. Bioanal. Chem., 375, p. 661Pinheiro, H.L.C., Andrade, V., Pereira, P.A.P., Andrade, J.B., (2004) Microchem. J., 78Reche, F., Garrigós, M.C., Sánchez, A., Jiménez, A., (2000) J. Chromatogr., A, 896, p. 51Kato, S., Burke, P.J., Fenick, D.J., Taatjes, D.J., Bierbaum, V.M., Koch, T.H., (2000) Chem. Res. Toxicol., 13, p. 509Kato, S., Burke, P.J., Koch, T.H., Bierbaum, V.M., (2001) Anal. Chem., 73Rivero, R.T., Topiwala, V., (2004) J. Chromatogr., A, 1029, p. 217http://www.cdc.gov/niosh/nmam/pdfs/3500.pdf, acessada em Setembro 2009Bosque-Sendra, J.M., Pescarolo, S., Cuadros-Rodríguez, L., García-Campaña, A.M., Almansa-López, E.M., (2001) Freseniuś J. Anal. Chem., 369, p. 715Ross, P.F., Draayer, H., Itoh, O., (2002) Biologicals, 30, p. 37Zhang, Z.Q., Yan, H.T., Yuc, X.F., (2004) Microchim. Acta, 146, p. 259Sibirny, V.A., Gonchar, M.V., Grabek-Lejko, D., Pavlishko, H.M., Csoregi, E., Sibirny, A.A., (2008) Int. J. Environ. Anal. Chem., 88, p. 289Feigl, F., (1956) Spot Tests in Organic Analysis, , 5th ed. Elsevier: AmsterdamGeorghiou, P.E., Ho, C.K., (1989) Can. J. Chem., 67Fagnani, E., Melios, C.B., Pezza, L., Pezza, H.R., (2003) Talanta, 60, p. 171Gigante, A.C., Gotardo, M.A., Tognolli, J.O., Pezza, L., Pezza, H.R., (2004) Microchem. J., 77, p. 47Tininis, A.G., Santini, A.O., Fagnani, E., Melios, C.B., Pezza, L., Pezza, H.R., (2001) Eclet. Quim., 26, p. 175Kingston, H.M., Jassie, L.B., (1988) Introduction to Microwave Sample Preparation - Theory and Practice, , ACS Professional Reference Books: WashingtonGigante, A.C., Pezza, L., Pezza, H.R., (2002) Eclet. Quim., 27, p. 223http://www.anvisa.gov.br/monitora/cmed/legis/comunicados/ lista_conformidade.pdf, acessada em Setembro 2009(1995) The United States Pharmacopeia - The National Formulary, , United States Pharmacopeial Convention, 23rd ed. U.S. Pharmacopeia: RockvilleMiller, J.N., Miller, J.C., (2000) Statistics and Chemometrics for Analytical Chemistry, , 4th ed. Pearson Education: EssexBalasubramanian, M., Thennarassu, S., Sudhakaran, T., Perumal, P.T., (2003) Biol. Pharm. Bull., 26, p. 1211Pavitrapok, C., Williams, D.A., (2006) J. Pharm. Biomed. Anal., 40, p. 1243(2000) Data Analysis and Technical Graphics, , OriginLab CorporationORIGIN® 6.1, Northampton, Estados Unido
A class of fractional refinable functions
No full textStarting from a family of centrally symmetric, totally positive and
compactly supported (GP) refinable functions and introducing a fractional
exponent in the discrete Fourier transform, new functions, that are
proved to be still refinable, are generated. Even if, for non integer,
they are not compactly supported anymore they exhibit a decay that
allows them to belong to L2(R); moreover, for certain values of their
parameters they reduce to the fractional B-splines, while, for integer,
they interpolate the GP refinable functions. Also, these refinable functions
can be characterized by a convolution relation between suitable minimally
supported GP refinable functions and suitable fractional B-splines
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
Arduino Cantafora e l'enigma dello sguardo
No full textil lavoro teorico e pittorico di Cantafora sull'architettura, i suoi elementi, i suoi caratteri ed il suo rapporto con i fatti naturali è stato discusso con l'autore, il critico Gianni Contessi, il prof. B. Gravagnuol
Systematic Variable Length Check Binary Unordered/AUED Codes
No full textIn an unordered code no codeword is contained into any other codeword. Unordered codes are All Unidirectional Error Detecting (AUED) codes. It is well known that among all systematic codes with k information bits, Berger codes are optimal unordered codes with r = [log(2)(k + 1)] check bits. This paper introduces a new class of systematic unordered codes with variable length check symbols whose average redundancy is r approximate to (1/2) log(2)(pi ek/2) = (1/2) log(2) k +1.04709 ... Such new codes are shown to be optimal in the class of systematic AUED codes with fixed length information symbols and variable length check symbols
A new class of biorthogonal wavelets on the interval
No full textConsidering the class of the refinable GP functions, I construct a class of biorthogonal bases on the interval with any prescribed order of polynomial exactness. Numerical results are compared with respect to the B-spline bases and show better performances
Variable lenght unordered codes
No full textIn an unordered code no codeword is contained in any other codeword. Unordered codes are all unidirectional error detecting (AUED) codes. In the binary case, it is well known that among all systematic codes with k information bits, Berger codes are optimal unordered codes. This paper gives some new theory on variable length unordered codes and introduces a new class of systematic unordered codes with variable length check symbols. The average redundancy of these new codes is almost half one of Berger codes. It is also shown that such codes are optimal in the class of systematic unordered codes with fixed length information symbols and variable length check symbols. The generalization to the non-binary case is also given
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