Entity

Time filter

Source Type

São José do Rio Preto, Brazil

Kobelnik M.,Centro Universitario do Norte Paulista | Cassimiro D.L.,Sao Paulo State University | Santos D.D.,Sao Paulo State University | Ribeiro C.A.,Sao Paulo State University
Chinese Journal of Chemistry | Year: 2011

Solid state compounds of general formula Sr(Diclof) 2 ·5.7H 2O and Ba(Diclof) 2·4.8H 2O were obtained. Thermogravimetry (TG), differential scanning calorimetry (DSC), X-ray diffraction powder patterns and microscopy analysis were used to characterize these compounds. Details concerning the dehydration and thermal decomposition as well as data of kinetic parameters have been described here. The kinetic behaviors of these stages were evaluated from several heating rates with samples masses of 2 and 5 mg in open crucibles under a nitrogen atmosphere. The results of the present study improve the knowledge on these compounds including their dehydration and thermal stability. The obtained data depend on the mass of the sample which results in two kinetic behavior patterns. © 2011 SIOC, CAS, Shanghai & WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Lofego A.C.,Sao Paulo State University | Rezende J.M.,Sao Paulo State University | Verona R.L.C.,Centro Universitario do Norte Paulista | Feres R.J.F.,Sao Paulo State University
Systematic and Applied Acarology | Year: 2013

The physic nut (Jatropha curcas L.) (Euphorbiaceae) has emerged as a new option in cultivation aimed at biodiesel production. In order to provide information that may be useful to further develop management plans for that specific crop, samples of mites were collected from cultured and wild J. curcas plants in various regions of the country and from two other species of the same genus, Jatropha gossypiifolia L. and Jatropha mollissima (Pohl) Baill. in the northeastern region of Brazil. Altogether 31 species belonging to 10 families were recorded. The family Phytoseiidae presented the largest number of species (17). Polyphagotarsonemus latus Banks (Tarsonemidae) was the most abundant species (8,503 specimens). A dichotomous key was prepared to identify all the sampled species. At least four mite species of the samples deserve attention as showing potential for being pests in the crops of J. curcas, Brevipalpus phoenicis, Brevipalpus obovatus, Polyphagotarsonemus latus and Tetranychus bastosi, the latter two often found in great abundance. © 2013 Systematic & Applied Acarology Society. Source


Kobelnik M.,Centro Universitario do Norte Paulista | Ribeiro C.A.,Sao Paulo State University | Dos Santos Dias D.,Sao Paulo State University | De Almeida S.,Sao Paulo State University | And 2 more authors.
Journal of Thermal Analysis and Calorimetry | Year: 2011

The Co(II)-diclofenac complex was evaluated by simultaneous thermogravimetry-differential thermal analysis (TG-DTA) and differential scanning calorimetry (DSC). The DTA curve profile shows one exothermic peak because of the transition phase of the compound between 170 and 180 °C, which was confirmed by X-ray powder diffractometry. The transition phase behavior was studied by DSC curves at several heating rates of a sample mass between 1 and 10 mg in nitrogen atmosphere and in a crucible with and without a lid. Thus, the kinetic parameters were evaluated using an isoconversional non-linear fitting proposed by Capela and Ribeiro. The results show that the activation energy and pre-exponential factor for the transition phase is dependant on the different experimental conditions. Nevertheless, these results indicate that the kinetic compensation effect shows a relationship between them. © 2010 Akadémiai Kiadó, Budapest, Hungary. Source


Kobelnik M.,Centro Universitario do Norte Paulista | Kobelnik M.,Sao Paulo State University | Cassimiro D.L.,Sao Paulo State University | De Almeida A.E.,Sao Paulo State University | And 2 more authors.
Journal of Thermal Analysis and Calorimetry | Year: 2011

The Al and In-diclofenac compounds were prepared. Thermogravimetry (TG) and X-ray diffraction powder patterns were used to characterize these compounds. Details concerning the dehydration and thermal decomposition as well as data of kinetic parameters have been described here. The kinetic studies of these stages were evaluated from several heating rates with mass sample of 2 and 5 mg in open crucibles under nitrogen atmosphere. The results of the present study improve the knowledge on these compounds including their dehydration and thermal stability. The obtained data leads to a dependence on the sample mass, which results in two kinetic behavior patterns. © 2011 Akadémiai Kiadó, Budapest, Hungary. Source


Kobelnilk M.,Centro Universitario do Norte Paulista | Fontanari G.G.,University of Sao Paulo | Cassimiro D.L.,Sao Paulo State University | Ribeiro C.A.,Sao Paulo State University | Crespi M.S.,Sao Paulo State University
Journal of Thermal Analysis and Calorimetry | Year: 2014

Coffee seeds are a source for obtaining oil which is used in the candy, soluble coffee, and cosmetics industries. The main purpose of this study was the investigation of the lipid profile and thermal behavior of the roasted and in nature coffee oil of Arabica and Robusta species, using thermogravimetry, differential thermal analysis, derivative thermogravimetry, differential scanning calorimetry (DSC), and modulated DSC. Details concerning the thermal decomposition as well as data of the kinetic parameters have been described here. The kinetic studies were evaluated from several heating rates with a sample mass of 10 mg in open crucible under nitrogen atmospheres. The obtained data were evaluated with the isoconversional kinetic method, where the values of activation energy (E a/kJ mol-1) were evaluated in function of the conversion degree (α). In addition, this oil was evaluated by modulated DSC from 25 to -60 C, where the transition phase behavior was verified. © 2013 Akadémiai Kiadó, Budapest, Hungary. Source

Discover hidden collaborations