X Ray Difraction
Mostrando 13-20 de 20 artigos, teses e dissertações.
-
13. Estudo cristaloquímico de dois derivados do lapachol utilizando a difraçao de raios X
Este trabalho apresenta um estudo cristaloquímico feito sobre dois compostos derivados do lapachol: 2-hidroxi-3-(2-metil-propenil)1,4-naftoquinona (nl) e 2-acetoxi-3-(3-metil-1-butenil)-1,4-naftoquinona (ail). O composto denominado de (nl) cristalizou no sistema monoclínico, grupo espacial P21/c, com parâmetros a = 4,3564(2) Å; b = 16,4069(8) Å; c = 15,
Publicado em: 2006
-
14. Estudo de filmes ultra-finos de Sb/In crescidos sobre Ni (111)
In this thesis we present a studied the growth of the ultra-thin films of Sb on Ni(111) and In on Ni(111), in the sub-monolayer regime. The main interest was on the understanding of the crystallography and electronic structure theses surface alloys. The films were grown under UHV conditions and characterized as to their electronic structure by X-ray Photoele
Publicado em: 2005
-
15. IMPLEMENTATION OF THE GEOTECHNIC ENGINEERING EXPERIMENTAL FIELD OF UFSM / IMPLANTAÇÃO DO CAMPO EXPERIMENTAL DE ENGENHARIA GEOTÉCNICA DA UFSM
Presently, on the Geotechnic Engineering art, the superficial and deep foundation projects are conditioned for the load capacity and for the admissibles settlements. The foundation projects and geotechnic sites in Santa Maria/RS have a preponderant empirical character. The soil knowledge are based, almost exclusively, on their behavior on previous sites and
Publicado em: 2004
-
16. Estudo do processo de encapsulação do bioaroma de gorgonzola em Beta-ciclodextrina e em lipossomas
In this work, it was studied the stabilization of the blue cheese flavour compounds obtained from fermentation of Aspergillus sp, by complexation in P-cyclodextrin and encapsulation in liposomes. The complexation in P-cyclodextrin was carried out by coprecipitation method. Initially, the complexation was studied using concentrated solutions of the main synth
Publicado em: 2003
-
17. Estudo de Fases Termotrópicas por Microscopia Óptica, Medidas de Densidade, Entálpicas e Espalhamento de Raios X / Thermotropic phase study, by optical microscopy, density and calorimetric measurements and X-ray scattering.
The influence of the mean molecular length on the nature of the smectic A (SA)- cholesteric (C) liquid crystal phase transition has been studied for cholesteryl myristate (C14), cholesteryl nonanoate (C9) and binary mixtures of C14 and C9 and cholesteryl caproate (C6) and C9. Optical microscopy was carried out to determine the temperatures of the SAC as weel
Publicado em: 2000
-
18. Oxidação seletiva de cicloexano catalisada por zeolita Y contendo terras raras
Catalysts of the type LnY (Ln = Ce, Me, Nd, Sm and Yb) were synthesized starting from the respective rare earth chlorides and of zeolites Y (Si: AI = 2,6 , 12,5, 28, 60 and 100) by means of solid state exchange (T = 800 K, p = 13 kPa and t = 6 h). Such catalysts were characterized by X-ray difraction, infrared espectroscopy, AI and Si nuclear magnetic resona
Publicado em: 1999
-
19. Polpação acetosolv de bagaço de cana e madeira de eucalipto
Acetosolv pulping of sugar cane bagasse and Eucalyptus grandis wood was studied with the objective to make adequate the conditions of this process for national feedstocks and to promote the integral use of lignocellulosic materials. The pulping of extracted and depithed sugar cane bagasse (8.0% humidity, 1.2% ash, 22.7% lignin and 53.2% cellulose) and eucaly
Publicado em: 1992
-
20. Obtenção e caracterização de metafosfatos de aluminio : um novo pigmento branco
Titanium dioxide is widle used as a white pigment, because it is a powerful light backscatterer due to its high refractive index. It may be predicted, following Mie s theory, that hollow particles of any refractive index may also be good scatterers. The subject of this thesis is the preparation and characterization of aluminum metaphosphates and the evaluati
Publicado em: 1991