1,721,005 research outputs found
Palladium(II) and platinum(II), (IV) complexes of 2-aminopyrimidine derivatives
No full textPalladium(II) and Platinum(II),(IV) complexes with 2-aminopyrimidine derivatives (L-1)-(L-3), prepared by reacting the corresponding metal halide with the ligand in the required stoichiometric ratio, were characterised by chemical analyses and physical measurements. The structures have been assigned on the basis of i.r. spectroscopy, electronic reflectance spectra and molar conductivities
Synthesis, characterization, structure and cytotoxic activity of complexes of AuX3 with some amidrazone derivatives
No full textCrystal structure of diaquabis(N1-acetylacetamidrazone)cobalt(II) dichloride, C8H22CI2C0N6O4
No full textPalladium(II) and platinum(II), (IV) complexes of acetamidrazomes
No full textPalladium(II) and platinum(II), (IV) complexes with N-1-acylacetamidrazones (L1-L5) and N-1-acyl-2-phenylacetamidrazones (L6-L9) are described. The complexes have been prepared by reaction of the corresponding metal chloride with the ligand in the required stoichiometrical ratio and were characterized by chemical analyses and physical measurements. The stereochemistry has been assigned on the basis of IR, far IR spectroscopy, electronic reflectance spectra and molar conductivity values. (C) 1998 Elsevier Science Ltd. All rights reserved
Carbon 14 dating of some materials found during the excavation of the catacomb of san gennaro in naples: Old research and new data
No full textThe review of an old14C dating investigation and the new radi-ometric analysis on 10 different samples, conducted by the Center for Isotopic Research on Cultural and Environmental heritage (CIRCE) of the University of Campania “Luigi Vanvitelli”, through the AMS (Accelerator Mass Spectrometry), offer useful elements to date the excavation and relative phases of the catacomb of St. Ianuarius, the most important Late Antique cemetery in Naples. Several excavations have been carried out in the catacomb since the nineteenth century, not always conducted in a systematic manner and published only in part. In the last decade, the Pontifical Commission for Sacred Archeology has started the edition of the old excavations and finds, thanks also to the archaeometric analysis. The recalibration of a previous measurement of a beam fragment discovered during the excavations carried out in the 1970s, based on the new IntCal 13 Calibration Curve and the Oxcal Software 4.3, allowed the finding to be more correctly dated to 530-659 A.D. (±2σ). The AMS reduces not only the14C isotopic measurement time but also the weight of the material used for dating. Furthermore, advances in chemical treatments on samples of different nature make it possible not only to quantify radiocarbon in a wider range of organic materials but also, through an innovative calcite extraction process, dating from mortars (first mortar radiocarbon dating of the catacombs analyzed). The results obtained in this study expand our knowledge on the catacomb not only in Late Antiquity and in the Middle Ages, but also in the following centuries (see the dating of the samples Sgn 1, Sgn 2, Sgn 3, Sgn 6)
Attività Citotossica in vitro di altri Derivati dell' Acetamidrazone e dei loro Complessi con Palladio (II), con Platino (IV)
No full textCrystal structure of diaquabis(N -acetylacetamidrazone)cobalt(II) dichloride, C8H22Cl2CoN6C4
No full textCombined fuzzy and genetic algorithm for the optimisation of hybrid composite-polymer joints obtained by two-step laser joining process
Full text linkIn the present work, genetic algorithms and fuzzy logic were combined to model and optimise the shear strength of hybrid composite-polymer joints obtained by two step laser joining process. The first step of the process consists of a surface treatment (cleaning) of the carbon fibre-reinforced polymer (CFRP) laminate, by way of a 30 W nanosecond laser. This phase allows removing the first matrix layer from the CFRP and was performed under fixed process parameters condition. In the second step, a diode laser was adopted to join the CFRP to polycarbonate (PC) sheet by laser-assisted direct joining (LADJ). The experimentation was performed adopting an experimental plan developed according to the design of experiment (DOE) methodology, changing the laser power and the laser energy. In order to verify the cleaning effect, untreated laminated were also joined and tested adopting the same process conditions. Analysis of variance (ANOVA) was adopted to detect the statistical influence of the process parameters. Results showed that both the laser treatment and the process parameters strongly influence the joint performances. Then, an uncertain model based on the combination of fuzzy logic and genetic algorithms was developed and adopted to find the best process parameters' set able to give the maximum joint strength against the lowest uncertainty level. This type of approach is especially useful to provide information about how much the precision of the model and the process varies by changing the process parameters
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