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101.
Barbra Caballero-Segura Carlos Eduardo Barrera Díaz Jorge Javier Ramírez García Graciela Zarazúa Ricardo Soria 《International journal of environmental analytical chemistry》2013,93(13):1288-1301
The comparison between inductively coupled plasma optical emission spectrometry (ICP-OES) and total reflection X-ray fluorescence spectrometry (TXRF) for simultaneous determination of metal content (Cr, Cu, Fe, Mn, Pb and Zn) in mosses from the Metropolitan Area of the Toluca Valley was performed. Epiphytic mosses (Fabriona ciliaris and Leskea angustata) were collected in two sampling campaigns and were digested with HNO3, HCl and HF for ICP-OES method and HNO3 and HCl for TXRF method. The certified reference material (IAEA-336, Lichen) and the Standard Reference Material (SRM-1573, tomato leaves) were used for the quality control and to evaluate trueness and precision. Linearity, detection and quantification limits were also determined. Results show an ICP-OES and TXRF trueness mean of 101 ± 5% and 97 ± 9%, respectively; the relative standard deviation (RSD percent) was less than 17% in both methods. The moss samples exhibit a satisfactory precision (RSD ≤ 20%), because the RSD percent for ICP-OES, from 2% to 15%, and that for TXRF, from 1% to 17%, were obtained. One factor experimental design and simple regression analysis (α = 0.05) were used to compare the ICP-OES and TXRF metal concentrations. The statistical results do not show significantly different values for Cu, Mn, Pb and Zn in both the sample campaigns. In addition, the average results for Cr in the first sample campaign (30.3 ± 11.4 mg/kg for ICP-OES and 18.6 ± 9.8 mg/kg for TXRF) and Fe values in the second sample campaign (10,810 ± 2980 mg/kg for ICP-OES and 8380 ± 2350 mg/kg for TXRF) were significantly different in both methods. These differences are attributed to an incomplete sample digestion in the TXRF sample preparation. The results of the simple regression analyses show p-value less than 0.05, which indicates an equivalent and significant relation between ICP-OES and TXRF. 相似文献
102.
General projection-pursuit estimators for the common principal components model: influence functions and Monte Carlo study 总被引:2,自引:0,他引:2
The common principal components (CPC) model for several groups of multivariate observations assumes equal principal axes but possibly different variances along these axes among the groups. Under a CPCs model, generalized projection-pursuit estimators are defined by using score functions on the dispersion measure considered. Their partial influence functions are obtained and asymptotic variances are derived from them. When the score function is taken equal to the logarithm, it is shown that, under a proportionality model, the eigenvector estimators are optimal in the sense of minimizing the asymptotic variance of the eigenvectors, for a given scale measure. 相似文献
103.
Adriana F. Ibaez Graciela Y. Moltrasio Iglesias 《Journal of mass spectrometry : JMS》1991,26(3):132-134
The electron impact mass spectral fragmentation of a series of 3-substituted-l,2,3,4-tetrahydroisoquinolines are reported. The principal fragmentation modes of these compounds comply with the main generalizations reached earlier with simpler systems. Complete aromatizations to form the isoquinolinium ion are observed only for compounds 5 and 7 and no retro-Diels-Alder cleavage is observed when R1 is a benzyl group. 相似文献
104.
In this paper, we introduce nonparametric ARMA models which provide an alternative to nonparametric autoregressive models,
when there is a large dependence to the past observations. Conditions for ergodicity and geometric ergodicity are given when
both the nonparametric autoregressive part and themoving average structure depend only one step behind. Also, a Fisher-consistent
procedure is provided and its performance is studied through a simulated example.
Received: 9 April 2002 相似文献
105.
Saxena S Ray AR Kapil A Pavon-Djavid G Letourneur D Gupta B Meddahi-Pellé A 《Macromolecular bioscience》2011,11(3):373-382
Polypropylene sutures (PP) are already used in surgery. Because microbial infection leads to complications, we developed antimicrobial PP suture by plasma-induced graft polymerization of acrylic acid followed by chitosan binding on the remaining carboxyl groups. Mechanical properties and surface morphologies were analyzed on these sutures. Tetracycline hydrochloride (TC) or nanosilver (NS) was then immobilized to PP. The resulting PP sutures evidenced drug release properties and antimicrobial activity in vitro. PP implanted in vivo for 30 days in the muscle of rats showed the absence of adverse effects and a tissue organization. This new polypropylene suture with suitable antimicrobial features appears to be a promising macromolecular material for clinical and cosmetic applications. 相似文献
106.
Castellanos G Arzt E Kamperman M 《Langmuir : the ACS journal of surfaces and colloids》2011,27(12):7752-7759
The effect of viscoelasticity on adhesion was investigated for micropatterned epoxy surfaces and compared to nonpatterned surfaces. A two-component epoxy system was used to produce epoxy compositions with different viscoelastic properties. Pillar arrays with flat punch tip geometries were fabricated with a two-step soft lithography process. Adhesion properties were measured with a home-built adhesion tester using a spherical sapphire probe as a counter-surface. Compared to flat controls, micropatterned epoxy samples with low viscoelasticity (i.e., low damping factors) showed at least a 20-fold reduction in pull-off force per actual contact area for both low (E' = 2.3 MPa) and high (E' = 2.3 GPa) storage moduli. This antiadhesive behavior may result from poor contact formation and indicates that the adhesion performance of commonly used elastomers for dry adhesives (e.g., polydimethylsiloxane) is governed by the interfacial viscoelasticity. Adhesion significantly increased with increasing viscoelasticity. Micropatterned samples with high viscoelasticity showed a 4-fold reduction in adhesion for aspect ratio (AR) 1.1 patterns but a 2-fold enhancement in adhesion for AR 2.2 patterns. These results indicate that viscoelasticity can enhance the effect of surface patterning on adhesion and should be considered as a significant parameter in the design of artificial patterned adhesives. 相似文献
107.
Diego M. Díaz Pace Norberto A. Gabriele Mayra Garcimuño Cristian A. D'Angelo Graciela Bertuccelli Daniela Bertuccelli 《光谱学快报》2013,46(6):399-411
Laser-induced breakdown spectroscopy (LIBS) technique was applied for rapid analysis of major and minor elements composing geological samples including minerals, rocks, and a soil sample. The plasma was produced in air at atmospheric pressure by focusing on the targets a pulsed infrared Nd:YAG laser in open-path configuration. The emitted light in the UV-Vis was analyzed by a compact LIBS system to measure spectral emission lines of Si, Al, Fe, Ca, Na, K, Mg, C, Cu, Mn, and Ti. The experimental issues relevant for the analysis of the different samples were investigated by taking into account their peculiar features: drilling through a weathered layer, roughness and grain-size considerations, statistical averaging, and accuracy of the measurements. In this approach, the characterization of the samples was achieved by studying the relative variations of the emission intensities of each element normalized with respect to an internal standard. The present study shows the usefulness of LIBS as a tool for reliable identification of field samples. 相似文献
108.
Graciela Salicrup 《Topology and its Applications》1982,13(2):191-200
Y. Diers has defined multireflective subcategories as a generalization of reflective subcategories. In this paper, the related concepts of multiepireflective and monomultireflective subcategories are defined and investigated. It is proved that, for categories with appropriate (E,M) factorization structures, every multireflection can be expressed as the composition of an epireflection followed by a multiepireflection. Characterizations of multi-E-reflective subcategories are also given for categories with (E,M)-factorization structures. Finally, a list of subcategories of Top which are: multireflective in Top, multiepireflective in Top2 and {initial-monosources}-multireflective in CRog T2 is given. 相似文献
109.
María M. Branda Graciela R. Garda Horacio A. Rodriguez Norberto J. Castellani 《Applied Surface Science》2007,254(1):120-124
Density functional theory (DFT) cluster model calculations on methanol reactions on the β-Ga2O3 (1 0 0) surface have been realized. β-Ga2O3 structure has tetrahedral and octahedral ions and the results of gallia-methanol interaction are different depending on the local surface chemical composition. The surface without oxygen vacancies is very reactive and produces the methanol molecule decomposition. The unsaturated surface oxygen atoms strongly oxidize the methanol molecule. CO2 and H2O molecules are produced when methanol reacts with a free oxygen vacancy surface on octahedral gallium sites. On the other hand, H2CO is found after the reaction of this molecule with a free O vacancy surface on tetrahedral gallium sites. A weak interaction between the remaining CO2 molecule and the oxide surface was found, being this molecule easy to desorb. Otherwise, H2CO has a stronger surface bond and it could suffer a later oxidation. 相似文献
110.