8 documents found, page 1 of 1
Transição de fase em monocristais de taurina
Freire, Paulo de Tarso CavalcanteTaurine, NH3C2H4SO3, is a biological substance found in several organs of human body like retin, liver, heart, muscle, brain and some fluids like milk and bile. Infrared spectrum and Raman spectra were studied at room temperature and identification of normal modes was made. It was also studied the evolution of frequencies and linewidthsof the normal modes from Raman scattering when temperature changed in the ra...
Study of coprolites from the araripe sedimentary basin through FT-IR spectrosco...
Cruz Lima, Ricardo Jorge; Freire, Paulo de Tarso Cavalcante; Sasaki, Jose Marcos; Feitosa Saraiva, Antonio Alamo; Lanfredi, Silvania [UNESP]Made available in DSpace on 2020-12-10T18:07:00Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-01-01; Coprolites are fossilized faeces that constitute an important source of palaeobiological informations. This paper describes the characterization of some coprolite materials originated from the Romualdo Member of the Santana Formation (Araripe Basin, south of Ceara State in Brazil) by means of two techni...
Hydrogen bonds in crystalline D-alanine: diffraction and spectroscopic evidence...
Belo, Ezequiel de Andrade; Pereira, Jose Enedilton Medeiros; Freire, Paulo de Tarso Cavalcante; Argyriou, Dimitri N.; Eckert, JuergenEnantiomeric amino acids have specific physiological functions in complex biological systems. Systematic studies focusing on the solid-state properties of d-amino acids are, however, still limited. To shed light on this field, structural and spectroscopic studies of d-alanine using neutron powder diffraction, polarized Raman scattering and ab initio calculations of harmonic vibrational frequencies were carried ...
Caracterização espectroscópica de peixe do período cretáceo (Bacia do Araripe)
Lima, Ricardo Jorge Cruz; Saraiva, Antonio Alamo Feitosa; Lanfredi, Silvania [UNESP]; Nobre, Marcos Augusto de Lima [UNESP]Submitted by Guilherme Lemeszenski (guilherme@nead.unesp.br) on 2013-08-22T18:48:38Z No. of bitstreams: 1 S0100-40422007000100005.pdf: 237726 bytes, checksum: 47dbee753eaebe82c194ec3578f02966 (MD5); Made available in DSpace on 2013-08-22T18:48:38Z (GMT). No. of bitstreams: 1 S0100-40422007000100005.pdf: 237726 bytes, checksum: 47dbee753eaebe82c194ec3578f02966 (MD5) Previous issue date: 2007-02-01; Made availabl...
Estudo de coprólito da bacia sedimentar do Araripe por meios de espectroscopia ...
Lima, Ricardo Jorge Cruz; Freire, Paulo de Tarso Cavalcante; Sasaki, José Marcos; Saraiva, Antonio Álamo Feitosa; Lanfredi, Silvania [UNESP]Submitted by Guilherme Lemeszenski (guilherme@nead.unesp.br) on 2013-08-22T18:48:41Z No. of bitstreams: 1 S0100-40422007000800029.pdf: 436690 bytes, checksum: 513cc2ad1b08249f6f338fd0f027e10d (MD5); Made available in DSpace on 2013-08-22T18:48:41Z (GMT). No. of bitstreams: 1 S0100-40422007000800029.pdf: 436690 bytes, checksum: 513cc2ad1b08249f6f338fd0f027e10d (MD5) Previous issue date: 2007-01-01; Made availabl...
Studies of catalytic activity and coke deactivation of spinel oxides during eth...
Freire, Rafael M.; Sousa, Francisco F. de; Pinheiro, Anderson L.; Longhinotti, Elisane; Mendes Filho, J.; Oliveira, Alcemira ConceiçãoTexto completo: acesso restrito. p. 165-179; Submitted by Suelen Reis (suziy.ellen@gmail.com) on 2013-10-11T12:08:24Z No. of bitstreams: 1 1-s2.0-S0926860X09001574-main.pdf: 834366 bytes, checksum: ff710893da1fa4171688240f210f8ac8 (MD5); Approved for entry into archive by Rodrigo Meirelles (rodrigomei@ufba.br) on 2013-11-18T21:18:58Z (GMT) No. of bitstreams: 1 1-s2.0-S0926860X09001574-main.pdf: 834366 bytes, ch...
Raman scattering and x-ray diffraction studies of polycrystalline CaCu3Ti4O12 u...
Reis Júnior, Daniel Valim dos; Souza Filho, Antônio Gomes de; Freire, Paulo de Tarso Cavalcante; Fagan, Solange Binotto; Ayala, Alejandro PedroWe report Raman scattering and x-ray diffraction studies of polycrystalline CaCu3Ti4O12 (CCTO) under high pressures. The pressure dependence of several Raman modes was investigated. No anomalies have been observed on the phonon spectra thereby indicating that the Th sIm 3¯d structure remains stable up to the maximum pressure s5.3 GPad we reached in this experiment. The pressure coefficients for the observed Ram...
Estudo da emissão do Cr3+ e CO2+ em matriz de KZnF3 sob pressão
Freire, Paulo de Tarso CavalcanteOrientador: Vólia Lemos Crivellenti; Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Fisica " Gleb Wataghin"; Resumo: Nesta tese são estudadas as luminescências do Cr3+ e do CO2+ na matriz cristalina KZnF3 nas condições de pressão atmosférica e altas pressões hidrostáticas. Tais sistemas possuem a importante característica de emitirem numa larga banda do espectro eletromagnético, do infraverm...