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Nomenclatura Unesco > (22) Física > (2206) Física molecular
(2206.01) Radicales libres (2206.02) Moléculas inorgánicas
(2206.03) Macromoléculas (2206.04) Moléculas mesónicas y muónicas
(2206.05) Haces moleculares (2206.06) Iones Moleculares
(2206.07) Espectroscopia molecular (2206.08) Estructura molecular
(2206.09) Moléculas orgánicas (2206.10) Polímeros
(2206.99) Otras (especificar)

Mostrando recursos 1 - 20 de 223

1. Propiedades histológicas ultramicroscópicas de la lana - Helman, Mauricio B.
Recientemente se han registrado notables avances en el conocimiento de la estructura íntima de la fibra lanosa, consecuentemente con el revolucionario desarrollo de la microscopía electrónica. El propósito de esta comunicación es hacer una puesta al día simplificada de estas novedosas revelaciones que, al dilucidar la compleja intimidad de su naturaleza molecular, confirman propiedades físicas determinantes del inapreciable valor que posee como fibra textil esencial de la vida civilizada, y cuyas cualidades hilanderas no pueden ser superadas por ninguna otra de naturaleza vegetal o sintética.

2. Cálculo teórico de propiedades físicas en complejos moleculares de interés químico - Sánchez, Marina

3. Contents Departamento de Química e Física Molecular, - Klaus Capelle; São Carlos

4. Computer simulation of fifth generation dendronized polymers: impact of charge on internal organization - Bertran Cànovas, Òscar; Zhang, Baozhong; Schlüter, A. Dieter; Kröger, Martin; Alemán Llansó, Carlos
The internal organization of a fifth-generation dendronized polymer (PG5) has been investigated by atomistic molecular dynamics simulations in a vacuum. This study reveals an exceptional behavior of PG5 within the homologous series of g-generation PGg polymers. Three molecular configurations, which present a heterogeneous distribution of dendrons and an amount of backfolding lower than PG4 and PG6, have been obtained for PG5. The highest stability and closest agreement with available experimental data corresponds to a helical conformation characterized by a pitch of about 30 Å, thickness of 105 Å, and average density of 0.861 g/cm3. While small angle neutron scattering studies of PG5 in solution show a...

5. Computer simulation of fifth generation dendronized polymers: impact of charge on internal organization - Bertran Cànovas, Òscar; Zhang, Baozhong; Schlüter, A. Dieter; Kröger, Martin; Alemán Llansó, Carlos
The internal organization of a fifth-generation dendronized polymer (PG5)has been investigated by atomistic molecular dynamics simulations in a vacuum. This studyreveals an exceptional behavior of PG5 within the homologous series of g-generation PGgpolymers. Three molecular configurations, which present a heterogeneous distribution ofdendrons and an amount of backfolding lower than PG4 and PG6, have been obtained forPG5. The highest stability and closest agreement with available experimental datacorresponds to a helical conformation characterized by a pitch of about 30 Å, thickness of 105 Å, and average density of 0.861 g/cm3. While small angle neutron scattering studies of PG5 in solution show a...

6. New results in the characterization by Raman spectroscopy of yellow pigments used in ceramic artworks of the 16th and 17th centuries - Ferrer Espinilla, Perla; Ruiz Moreno, Sergio; Lopez Gil, A.; Chillon, M.C.; Sandalinas Linares, Maria Carmen
This investigation is focused on the identification in ceramic artworks of certain nonstandard yellow/orange pigments whose composition is based, fundamentally, on lead, tin, and antimony oxides with or without silica. In this work, a comparative study (temporal and geographical) of the employment of these yellow pigments in different production centers, from Italy (Pesaro and Montelupo) and Spain (Talavera de la Reina), during the Renaissance and Baroque epochs has been proposed. For this purpose, special very ancient yellow pigments were acquired from the Stazione Sperimentale del Vetro, Murano-Venezia (Italy). These reference pigments have been produced following strict and rigorous manufacturing recipes...

7. New results in the characterization by Raman spectroscopy of yellow pigments used in ceramic artworks of the 16th and 17th centuries - Ferrer Espinilla, Perla; Ruiz Moreno, Sergio; Lopez Gil, A.; Chillon, M.C.; Sandalinas Linares, Maria Carmen
This investigation is focused on the identification in ceramic artworks of certain nonstandard yellow/orange pigments whose composition is based, fundamentally, on lead, tin, and antimony oxides with or without silica. In this work, a comparative study (temporal and geographical) of the employment of these yellow pigments in different production centers, from Italy (Pesaro and Montelupo) and Spain (Talavera de la Reina), during the Renaissance and Baroque epochs has been proposed. For this purpose, special very ancient yellow pigments were acquired from the Stazione Sperimentale del Vetro, Murano-Venezia (Italy). These reference pigments have been produced following strict and rigorous manufacturing recipes...

8. Microprocesado de matrices termoplásticas mediante ultrasonidos: Evaluación de las propiedades químicas y físicas de los materiales procesados - Rodríquez Bravo, Lorena
En este Proyecto, se ha estudiado la aplicación de un nuevo sistema de micro-moldeo basado en la utilización de ultrasonidos y se ha evaluado el efecto de las condiciones de procesado en las características de distintos tipos de materiales (polilactida (PLA), polimetilmetacrilato (PMMA), copolímeros de naturaleza segmentada basados en la poliglicolida (GL-b-[GL-co-TMC]-b-GL 85-37.5) y nylon 12 (PA12)). Se ha considerado principalmente un poliéster (polilactida, PLA) de naturaleza biodegradable y con amplias aplicaciones en biomedicina que es un campo donde existe una gran demanda potencial de piezas micro-moldeadas. En concreto, se han empleado tres tipos de polilactida (PLA) con distinto grado...

9. 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,...

10. 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

11. 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

12. 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...

13. 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...

14. 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...

15. (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

16. 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.

17. 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

18. Departamento de Física Atómica, Molecular y Nuclear, Universidad de Sevilla, - F. Catara B
Excitation of multiple giant dipole resonances: from spherical to deformed nuclei

19. Departamento de Física Atómica, Molecular y Nuclear - J. E. Amaro; M. B. Barbaro; J. A. Caballero; T. W. Donnelly; A. Molinari
correlations

20. 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

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