Mostrando recursos 1 - 20 de 213
1.
Caracterização de acessos de batata-doce do banco de germoplasma da Unicentro, PR
- Camargo, Letícia Kurchaidt Pinheiro
Resumo: A batata-doce é uma hortaliça tipicamente tropical e subtropical, rústica, de fácil cultivo, apresenta boa resistência a seca e ampla adaptação, além de ser considerada uma cultura alimentícia de grande valor, por ser rica em carboidratos. Sua importância econômica e social está ligada à produção por agricultores familiares, que em pequenas propriedades tem na cultura sua subsistência. O sul do Brasil é responsável por mais da metade da produção de batata-doce do Brasil. Há anos a batata-doce é utilizada na alimentação humana e alimentação animal, porém, na última década foi dada ênfase para mais uma aptidão da raiz tuberosa,...
2.
Effect of humidity in charge formation and transport in LDPE
- Aragoneses Aguado, Andrés; Tamayo, Ildaberto; Lebrato, Alexander; Cañadas Lorenzo, Juan Carlos; Diego Vives, José Antonio; Arencón Osuna, David; Belana Punseti, Juan
3.
Effect of humidity in charge formation and transport in LDPE
- Aragoneses Aguado, Andrés; Tamayo, Ildaberto; Lebrato, Alexander; Cañadas Lorenzo, Juan Carlos; Diego Vives, José Antonio; Arencón Osuna, David; Belana Punseti, Juan
4.
Polymorphism in halogen-ethane derivatives: CCl3-CCl3 and ClF2C-CF2Cl
- Negrier, Philippe; Tamarit Mur, José Luis; Barrio Casado, María del; Mondieig, Denise
The polymorphism of hexachloroethane, Cl3C−CCl3, has been reinvestigated by means of X-ray and neutron scattering. The long time unknown structure of the intermediate phase II of Cl3C−CCl3 has been determined as monoclinic C2/m, with lattice parameters a = 17.9835(21) Å, b = 10.3642(11) Å, c = 6.3014(8) Å, and β = 94.410(5)° at 323 K, Z = 6. The polymorphism of 1,2-dichloro-1,1,2,2-tetrafluoro-ethane, ClF2C−CF2Cl, has also been investigated, and the structure of the intermediate phase II has been found to be orthorhombic (Cmca, Z = 4) with lattice parameters a = 6.305(4) Å, b = 10.177(12) Å, c = 8.714 (7) Å. The high-temperature phase I of ClF2C− CF2Cl has...
5.
Polymorphism in halogen-ethane derivatives: CCl3-CCl3 and ClF2C-CF2Cl
- Negrier, Philippe; Tamarit Mur, José Luis; Barrio Casado, María del; Mondieig, Denise
The polymorphism of hexachloroethane, Cl3C−CCl3, has beenreinvestigated by means of X-ray and neutron scattering. The long timeunknown structure of the intermediate phase II of Cl3C−CCl3 has been determinedas monoclinic C2/m, with lattice parameters a = 17.9835(21) Å,b = 10.3642(11) Å, c = 6.3014(8) Å, and β = 94.410(5)° at 323 K, Z = 6. Thepolymorphism of 1,2-dichloro-1,1,2,2-tetrafluoro-ethane, ClF2C−CF2Cl, hasalso been investigated, and the structure of the intermediate phase II has beenfound to be orthorhombic (Cmca, Z = 4) with lattice parameters a = 6.305(4)Å, b = 10.177(12) Å, c = 8.714 (7) Å. The high-temperature phase I of ClF2C−CF2Cl has...
6.
Modificació de l'àcid polilàctic mitjançant compostos polifuncionals
- Valls Pepió, Núria
Para la realización de este proyecto, se han llevado a cabo una serie de experimentos en el laboratorio con el objetivo de encontrar un o varios compuestos polifuncionales capaces de mejorar las propiedades físicas del ácido poliláctico.Con el fin de mejorar tales propiedades, se han utilizado compuestos polifuncionales de tres grupos diferentes: polioles, anhídridos ácidos y compuestos epoxidados. Estos compuestos, debido a que poseen más de un grupo funcional libre, deberían en principio ser capaces de hacer aumentar el peso molecular del PLA mediante la reacción de aquellos con los grupos funcionales terminales (-OH y -COOH) de las cadenas de...
7.
(c) Departamento de Fisica Atomica, Molecular y Nuclear
- V. R. Manfredi (a)(b; L. Salasnich (a)(c; Facultad De Ciencias Fisicas; Ciudad Universitaria
This work has been partially supported by the Ministero della Università e della
8.
a Departamento de Física Atómica, Molecular y Nuclear,
- C. H. Dasso A; L. Fortunato B; E. G. Lanza C; A. Vitturi B
The interplay of nuclear and Coulomb processes in the inelastic excitation of singleand double-phonon giant resonances in heavy ion collisions is studied within a simple reaction model. Predominance of the Coulomb excitation mechanism on the population of the single-phonon and, on the contrary, predominance of the nuclear excitation for the double-phonon is evidenced. The effect of the spreading of the strength distribution of the giant resonances on the excitation process is analyzed, showing sizeable modifications in the case of Coulomb dominated processes.
9.
b Departamento de Fisica Atomica, Molecular y Nuclear,
- A. N. Antonov A; M. K. Gaidarov A; D. N. Kadrev A; Facultad De Ciencias Fisicas
density distributions and related form factors in neutron-rich light exotic nuclei
10.
Departamento de Física Atómica, Molecular y Nuclear, Universidad de Sevilla,
- F. Catara B
Excitation of multiple giant dipole resonances: from spherical to deformed nuclei
11.
Departamento de Física Atómica, Molecular y Nuclear
- J. E. Amaro; M. B. Barbaro; J. A. Caballero; T. W. Donnelly; A. Molinari
correlations
12.
Departamento de Física Atómica, Molecular y Nuclear
- J. E. Amaro; M. B. Barbaro; J. A. Caballero; T. W. Donnelly
Relativistic effects in electromagnetic nuclear responses in the quasi-elastic delta region
13.
Departamento de Física Atómica, Molecular y Nuclear
- J. E. Amaro; M. B. Barbaro; J. A. Caballero; T. W. Donnelly
electron scattering
14.
aDepartamento de Física Atómica, Molecular y Nuclear, Universidad Complutense de
- J. M. Udias; J. A. Caballero; E. Moya De Guerra; J. E. Amaro; T. W. Donnelly
Predictions for electron induced proton knockout from the p 1/2 and p 3/2 shells in 16 O are presented using various approximations for the relativistic nucleonic current. Results for the differential cross section, transverse-longitudinal response (RTL) and left-right asymmetry ATL are compared at |Q2 | = 0.8 (GeV/c) 2 corresponding to TJNAF experiment 89-003. We show that there are important dynamical and kinematical relativistic effects which can be tested by experiment. PACS: 25.30.Fj; 25.30.Rw; 24.10.-i; 21.60.Cs Keywords: Quasielastic electron scattering; Negative-energy components; Transverse-longitudinal response; Left-right asymmetry. Under quasielastic conditions the (e, e ′ p) reaction can be treated with confidence...
15.
Spectral Statistics in Large Shell Model Calculations 1 J.M.G. Gómez Departamento de Fisica Atómica, Molecular y Nuclear,
- Facultad De Ciencias Fisicas; V. R. Manfredi; L. Salasnich
The spectral statistics of low–lying states of fp shell nuclei are studied by performing large shell–model calculations with a realistic nuclear interaction. For Ca isotopes, we find deviations from the predictions of the random–matrix theory which suggest that some spherical nuclei are not as chaotic in nature as the conventional view assumes. 1.
16.
Departamento de Física Atómica, Molecular y Nuclear,
Abstract: The spectral statistics of low–lying states of several fp shell nuclei are studied with realistic shell–model calculations. For Ca isotopes, we find significant deviations from the predictions of the random–matrix theory which suggest that some spherical nuclei are not as chaotic in nature as the conventional view assumes. PACS numbers: 21.10.-k, 21.60.Cs, 24.60.Lz
17.
Departamento de Física Atómica, Molecular y Nuclear
- J. E. Amaro; M. B. Barbaro; J. A. Caballero; T. W. Donnelly
Delta-isobar relativistic meson exchange currents in quasielastic electron scattering
18.
Departamento de Fisica Atomica, Molecular y Nuclear
- V. R. Manfredi (a; L. Salasnich (d; S. Taddei (b)(c
This work has been partially supported by the Ministero dell’Università e della Ricerca
19.
Departamento de Física Atómica, Molecular y Nuclear, Universidad de
- J. A. Caballero; M. C. Martínez; T. W. Donnelly; E. Moya De Guerra; J. M. Udías; J. R. Vignote
Abstract. Coincidence scattering of polarized electrons from nuclei with polarization transfer to outgoing nucleons is studied within the context of relativistic mean field theory. Effects introduced by the dynamical enhancement of the lower components of the bound and scattered nucleon wave functions are analyzed for the polarized response functions and transferred polarization asymmetries. Results obtained by projecting out the negative-energy components are compared with the fully-relativistic calculation. The crucial role played by the relativistic dynamics in some spin-dependent observables is clearly manifested even for low/medium values of the missing momentum. Kinematical relativistic effects are also analyzed. A discussion of the...
20.
Departamento de Física Atómica, Molecular y Nuclear, Universidad de
- J. A. Caballero; M. C. Martínez; T. W. Donnelly; E. Moya De Guerra; J. M. Udías
Abstract. Coincidence scattering of polarized electrons from nuclei with polarization transfer to outgoing nucleons is studied within the context of relativistic mean field theory. Effects introduced by the dynamical enhancement of the lower components of the bound and scattered nucleon wave functions are analyzed for the polarized response functions and transferred polarization asymmetries. Results obtained by projecting out the negative-energy components are compared with the fully-relativistic calculation. The crucial role played by the relativistic dynamics in some spin-dependent observables is clearly manifested even for low/medium values of the missing momentum. Kinematical relativistic effects are also analyzed. A discussion of the... | |
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