Funções cognitivas, autoestima e autoconceito de crianças com transtorno de déficit de atenção e hiperatividade

The study aimed to compare the performance of children with ADHD and children without learning and/or attention difficulties in tasks of visual attention, executive functions, self-esteem and self--concept. Participants were34 children, 17 with ADHD and 17in the control group, with a mean age of 9.92 years. For the evaluation, the following tests were used: Cancellation Test, Trail Making Test, Stroop Color Word Test, Tower of London, Children's Depression Inventory, Self-Esteem Multidimensional Scale, and Children's Self-Concept Scale. The results indicated that children with ADHD showed worse out comes in attention and executive functions evaluations, in the belief of doing things the wrong way, in feelings of guilt and in low self-esteem, both in the general result as well as in self-perception.The study aimed to compare the performance of children with ADHD and children without learning and/or attention difficulties in tasks of visual attention, executive functions, self-esteem and self--concept. Participants were34 children, 17 with ADHD and 1272331340sem informaçãosem informaçãoAlbert, J., López-Martín, S., Fernández-Jaén, A., Carretié, L., Alteraciones emocionales en el trastorno por déficit de atención/hiperactividad: datos existentes y cuestiones abiertas (2008) Revista de Neurología, 47, pp. 39-45(2002) Diagnostic and statistical manual of mental disorders (DSM-IV-TR), , American Psychiatric Association (4th ed.) Washington, DC: AuthorBarkley, R.A., (2008) Transtorno de déficit de atenção/ hiperatividade: Manual para diagnóstico e tratamento, , (Ed.) (3. ed.). Porto Alegre, RS: ArtmedBerwid, O.G., Kera, E.A.C., Marks, D.J., Santra, A., Bender, H.A., Halperin, J.M., Sustained attention and response inhibitionin young children at risk for attention deficit/hyperactivity disorder (2005) Journal of Child Psychology and Psychiatry, 46 (11), pp. 1219-1229Biederman, J., Attention-deficit/hyperactivity disorder: A selective overview (2005) Biological Psychiatry, 57, pp. 1215-1220Biederman, J., Faraone, S.V., Milberger, S., Curtis, S., Chen, L., Marrs, A., Spencer, T., Predictors of persistence and remission of ADHD: Results from a four-year prospective follow-up study of ADHD children (1996) Journal of American Academic Child Adolescent Psychiatry, 38, pp. 966-975Biederman, J., Mick, E., Faraone, S.V., Braaten, E., Doyle, A., Spencer, T., Johnson, M.A., Influence of gender on attention deficit hyperactivity disorder in children referred to a psychiatric clinic (2002) American Journal Psychiatry, 159, pp. 36-42Cardo, E., Nevot, A., Redondo, M., Melero, A., Azua, B., Banda, G.G., Servera, M., Trastorno por déficit de atención/ hiperactividad: ?un patrón evolutivo? (2010) Revista de Neurología, 50 (SUPL. 3), pp. S143-S147Castellanos, F.X., Proal, E., Large-scale brain systems in ADHD: Beyond the prefrontal-striatal model (2012) Trends in Cognitive Sciences, 16 (1), pp. 17-26Chan, E., Mattingley, J.B., Huang-Pollock, C., English, T., Hester, R., Vance, A., Bellgrove, M.A., Abnormal spatial asymmetry of selective attention in ADHD (2009) Journal of Child Psychology and Psychiatry, 50 (9), pp. 1064-1072Ciasca, S.M., Rodrigues, S.D., Salgado, C.A., (2010) TDAH: Transtorno do Déficit de Atenção e Hiperatividade, pp. 23-36. , (Eds.) Rio de Janeiro, RJ: RevinterDuPaul, G.J., Stoner, G., (2007) TDAH nas escolas: Estratégias de avaliação e intervenção, , São Paulo, SP: M. BooksDupuy, F.E., Barry, R.J., Clarke, A.R., McCarthy, R., Selikowitz, M., Sex differences between the combined and inattentive types of attention-defi cit/hyperactivity disorder: An EEG perspective (2013) International Journal of Psychophysiology, 89 (3), pp. 320-327Eiraldi, R., Power, T., Karustis, J., Goldstein, S., Assessing ADHD and comorbid disorders in children: The Child Behavior Checklist and the Devereux Scales of Mental Disorders (2000) Journal of Clinical Child Psychology, 29 (1), pp. 3-16. , (March)Fernandez-Mayoralas, D.M., Fernandez-Jaen, A., Garcia-Segura, J.M., Quinones-Tapia, D., Neuroimagen en el transtorno por defi cit de atencion/hiperactividad (2010) Revista de Neurología, 50 (SUPL. 3), pp. S125-S133Glass, K., Flory, K., Martin, A., Hankin, B., ADHD and comorbid conduct problems among adolescents: Associations with self-esteem and substance use (2011) Attention Defi cit Hyperactivity Disorder, 3, pp. 29-39Gobbita, M., (2003) Escala multidimensional de auto-estima (EMAE): Construção e validação com crianças e adolescentes brasileiro, , (Tese de doutorado, Centro de Ciências da Vida, Pontifícia Universidade Católica de Campinas, Campinas, SP, Brasil)Gobitta, M., Guzzo, R.S.L., Estudo inicial do Inventário de Auto-Estima (SEI) - Forma A (2002) Psicologia: Reflexão e Crítica, 15 (1), pp. 143-150Gouveia, V.V., Barbosa, G.A., Almeida, H.J.F., Gaião, A.A., Inventário de Depressão Infantil - CDI: Estudo de adaptação com escolares de João Pessoa (1995) Jornal Brasileiro de Psiquiatria, 44, pp. 345-349Kovacs, M., (1992) Children Depression Inventory CDI: Manual, , New York: Multi-Health SystemsKrauel, K., Duzel, E., Hinrichs, H., Rellum, T., Santel, S., Baving, L., Emotional memory in ADHD patients with and without comorbid ADD/CD (2009) Journal Neural Transmission, 116, pp. 117-120Lima, R.F., Azoni, C.A.S., Ciasca, S.M., Attentional performance and executive functions in children with learning difficulties (2011) Psicologia: Reflexão e Crítica, 24 (4), pp. 685-691Lima, R.F., Travaini, P.P., Ciasca, S.M., Amostra de desempenho de estudantes do ensino fundamental em testes de atenção e funções executivas (2009) Psicopedagogia, 26 (80), pp. 188-199López-Villalobos, J.A., Serrano-Pintado, I., Andrés-De Llano, J.M., Delgado Sánchez-Mateos, J., Alberola-López, S., Sánchez-Azón, M.I., Utilidad del test de Stroop en el trastorno por déficit de atención/hiperactividad (2010) Revista de Neurología, 50, pp. 333-340López-Villalobos, J.A., Serrano-Pintado, I., Delgado Sánchez--Mateos, J., Ruiz Sanz, F., Sánchez-Azón, M.I., Sacristán Martín, M.A., Transtorno por déficit de atención/ hiperactividad: perfi l intelectual y factor de independencia a la distracción (2007) Revista de Neurología, 44 (10), pp. 589-595Mattos, P., Serra-Pinheiro, M.A., Rohde, L.A., Pinto, D., Apresentação de uma versão em português para uso no Brasil do instrumento MTA-SNAP-IV de avaliação de sintomas de transtorno do déficit de atenção/hiperatividade e sintomas de transtorno desafi ador e de oposição (2006) Revista de Psiquiatria, 28 (3), pp. 290-297Miranda-Casas, A., Presentación-Herrero, M.J., Colomer-Diago, C., Roselló, B., Satisfacción con la vida de niños con trastorno por déficit de atención/hiperactividad: estudio de posibles factores de riesgo y de protección (2011) Revista de Neurología, 52 (SUPL. 1), pp. S119-S126Simão, A.N.P., (2004) Avaliação neuropsicológica em crianças com transtorno e déficit de atenção e hiperatividade, , (Dissertação de mestrado, Faculdade de Ciências Médicas, Universidade Estadual de Campinas, Campinas, SP, Brasil)Simão, A.N.P., (2008) Treino em solução de problemas com crianças que apresentam transtorno de déficit de atenção e hiperatividade, , (Tese de doutorado, Faculdade de Ciências Médicas, Universidade Estadual de Campinas, Campinas, SP, Brasil)Simão, A.N.P., Toledo, M.M., Ciasca, S.M., Transtornos de déficit de atenção e hiperatividade. (2010) TDAH: Transtorno do déficit de atenção e hiperatividade, pp. 23-36. , S. M. Ciasca, S. D. Rodrigues, & C. A. Salgado (Eds.), Rio de Janeiro, RJ: RevinterSisto, F.F., Martinelli, S.C., (2004) Escala de Autoconceito Infanto - Juvenil (EAC-IJ), , São Paulo, SP: VetorSpreen, O., Strauss, E., (1998) A compendium of neuropsychological tests- administration, norms and commentary, , New York: Oxford University PressTaanila, A.M., Hurtig, T.M., Miettunen, J., Ebeling, H.E., Moilanen, I.K., Association between ADHD symptoms and adolescents' psychosocial well-being: A study of the northern Finland Birth cohort 1986 (2009) International Journal of Circumpolar Health, 68 (2), pp. 133-144Toledo, M.M., (2006) Comparação do diagnóstico e resposta a um treino de atenção em crianças com os subtipos de transtorno e déficit de atenção/hiperatividade, , (Tese de doutorado, Faculdade de Ciências Médicas, Universidade Estadual de Campinas, Campinas, SP, Brasil)Tunstall, J.R., (1999) Improving the utility of Tower of London: A neuropsychological test of planning, , (Master's thesis of Philosophy, School of Applied Psychology, Faculty of Healthy Sciences, Griffith University, Queensland, Australia)Comparar o desempenho de crianças com TDAH e crianças sem queixas de aprendizagem e/ou atenção em tarefas de atenção visual, funções executivas, autoestima e autoconceito. Fizeram parte do estudo 34 crianças, sendo 17 com TDAH e 17 do grupo controle, co

Seasonal variation of some limnological factors of lagoa do Guarana : a varzea lake of the High Rio Parana, state of Mato Grosso do Sul, Brazil

Le lac de Guarana présente de fortes variations saisonnières des conditions physico-chimiques du milieu. Celles-ci sont attribuées à deux causes principales : d'une part, le régime hydrologique du Parana qui provoque des modifications de niveau dans le lac et l'inondation de la varzea et, d'autre part, les pluies qui augmentent les apports de carbone organique (composés humiques) et des nutriments par les petits affluents tributaires. (Résumé d'auteur

Effects of quercetin on exercise performance, physical activity and blood supply in a novel model of sustained hind-limb ischaemia

Background: There are currently few effective drugs to treat the leg symptoms of peripheral arterial disease (PAD). Previous studies have suggested that the nutraceutical, quercetin, can improve exercise performance and reduce pain sensitivity in healthy mice and improve blood supply in a rodent model of acute hind-limb ischaemia. These models may not be relevant to people with PAD. The aim of this study was to examine the effect of quercetin on exercise performance, physical activity and blood supply in a novel mouse model of sustained hind-limb ischaemia. Methods: Hind-limb ischaemia was induced in 6-month-old male apolipoprotein E-deficient mice using a novel two-stage surgical procedure. Five days after induction of ischaemia, mice were allocated to commence dietary quercetin or a control diet for 4 weeks. The primary outcome was exercise performance evaluated using a treadmill test. Other outcomes included physical activity, estimated by an open field test, and hind-limb blood supply, assessed by laser Doppler monitoring. Results: A sustained reduction in relative limb blood supply (P < 0.001) was achieved consistently in all 48 mice before allocation to a control (n = 24) or quercetin (n = 24) diet. Quercetin did not improve exercise performance (P = 0.785), physical activity (P = 0.151) or relative limb blood supply (P = 0.954) over the 4-week assessment period. Conclusion: These data suggest that quercetin does not improve exercise performance, physical activity or limb blood supply in mice with sustained hind-limb ischaemia, and therefore is unlikely be an effective treatment for PAD

Escolarização De Alunos Com Autismo

The inclusion of students with disabilities at school poses great challenges to educational policy. In the case of autism, communication and interaction difficulties add to the already existing barriers to the participation of students in the school setting. For this reason, in the present study, we proposed to investigate the autism schooling in a city in the state of São Paulo. We aimed at analyzing school access and stay of these students, and at characterizing the therapeutic and educational resources available to them. It is a descriptive study that analyzed data from the Basic Education Census of Atibaia between 2009 and 2012. The results show that the enrolment of students with autism is concentrated in public regular schools. Some of the students are enrolled in special schools. The study points, also, to the great number of students that evade the school system. In general, the schooling process of students with autism does not come to completion and few reach high school. © 2016, Associacao Brasileira de Pesquisadores em Educacao Especial. All rights reserved.22226928

Structural and optical studies of FeSb2 under high pressure

Nanostructured orthorhombic FeSb2 and an amorphous phase were formed by mechanical alloying starting from a mixture of high purity elemental Fe and Sb powders. The effects of high pressures on structural and optical properties were studied using X-ray diffraction (XRD) and Raman spectroscopy (RS). XRD patterns showed the presence of the orthorhombic FeSb2 phase up to the maximum pressure applied (28.2 GPa). The XRD patterns showed also an increase in the amount of the amorphous phase with increasing pressure up to 23.3 GPa. At 14.3 GPa, together with the former phases, a new phase was observed and indexed to a tetragonal FeSb2 phase, but its volume fraction is small at least up to 23.3 GPa. For the orthorhombic FeSb2 phase, the pressure dependence of the volume fitted to a Birch-Murnaghan equation of state gave a bulk modulus = 74.2 +- 3.0 GPa and its pressure derivative = 7.5 +- 0.6. RS measurements were performed from atmospheric pressure up to 45.2 GPa. For the orthorhombic FeSb2 phase, the Raman active mode was observed up to the maximum pressure applied, while the mode disappeared at 16.6 GPa. For pressures higher than 21 GPa, the Raman active mode of a tetragonal FeSb2 phase was observed, confirming ab initio calculations reported in the literature.Comment: 31 pages, 11 figures and 2 tables. Already submitted for publicatio

Higher spin fields and the problem of cosmological constant

The cosmological evolution of free massless vector or tensor (but not gauge) fields minimally coupled to gravity is analyzed. It is shown that there are some unstable solutions for these fields in De Sitter background. The back reaction of the energy-momentum tensor of such solutions to the original cosmological constant exactly cancels the latter and the expansion regime changes from the exponential to the power law one. In contrast to the adjustment mechanism realized by a scalar field the gravitational coupling constant in this model is time-independent and the resulting cosmology may resemble the realistic one.Comment: 15 pages, Latex twic

Towards predicting liquid fuel physicochemical properties using molecular dynamics guided machine learning models

Accurate determination of fuel properties of complex mixtures over a wide range of pressure and temperature conditions is essential to utilizing alternative fuels. The present work aims to construct cheap-to-compute machine learning (ML) models to act as closure equations for predicting the physical properties of alternative fuels. Those models can be trained using the database from MD simulations and/or experimental measurements in a data-fusion-fidelity approach. Here, Gaussian Process (GP) and probabilistic generative models are adopted. GP is a popular non-parametric Bayesian approach to build surrogate models mainly due to its capacity to handle the aleatory and epistemic uncertainties. Generative models have shown the ability of deep neural networks employed with the same intent. In this work, ML analysis is focused on two particular properties, the fuel density and diffusion, but it can also be extended to other physicochemical properties. This study explores the versatility of the ML models to handle multi-fidelity data. The results show that ML models can predict accurately the fuel properties of a wide range of pressure and temperature conditions.The research leading to these results had received funding from the Brazilian National Agency of Petroleum, Natural Gas and Biofuels (ANP) through Programa de Recursos Humanos (PRH) under the PRH 8 - Mechanical Engineering for the Efficient Use of Biofuels, grant agreement numbers F0A5.EDDE.B5C0.3BCB and 2B61.4F5C.A83B.A713.Peer ReviewedPostprint (published version

Cytogenetic Analysis Of Four Central Amazonian Species Of Colostethus (anura - Dendrobatidae) With A Diploid Complement Of 22 Chromosomes

Colostethus marchesianus from the type locality and three related species had 2n = 22 chromosomes, which differed from most other Colostethus species that have 2n = 24 chromosomes. The species analyzed were morphologically similar and showed a conservative karyotype, although they could be distinguished from each other by their C-banding pattern. Additional NOR sites, heteromorphism in NOR size and heterochromatin, and an additional rDNA site detected by FISH, were observed. These data suggest that chromosomal rearrangements and hetrochromatin-related events may have contributed to the karyotype differentiation of these Colostethus.1393189198Aguiar-Jr., O., Lima, A.P., Giaretta, A.A., Cytogenetics analysis of four poison frogs of the Epipedobates genus (Anura - Dendrobatidae) (2002) Herpetologica, 58, pp. 293-303Bogart, J.P., The influence of life history on karyotypic evolution in frogs (1991) Amphibian Cytogenetics and Evolution, pp. 233-258. , In: Green, D. M. and Sessions, S. K. (eds)Academic PressBogart, J.P., Hedges, D.S.B., Rapid chromosome evolution in Jamaican frogs of the genus Eleuterodactylus (Leptodactylidae) (1995) J. Zool. Lond., 235, pp. 9-31Busin, C.S., Vinciprova, G., Recco-Pimentel, S.M., Chromosomal rearrangements as the source of variation in the number of chromosomes in Pseudis (Amphibia-Anura) (2001) Genetica, 110, pp. 131-141Coloma, L.A., Ecuadorian frogs of the genus Colostethus (Anura: Dendrobatidae) (1995) Univ. Kansas Nat. Hist. Mus., Miscell. Publ., 87, pp. 1-72Duellman, W.E., Trueb, L., (1986) Biology of Amphibians, , McGraw-HillFoote, D.L., Willey, J.E., Little, M.L., Ribosomal RNA gene site polymorphism in Bufo terrestris (1991) Cytogenet. Cell Genet., 57, pp. 196-199Frost, D.R., Amphibian species of the world (2002), http://research.amnh.org/herpetology/amphibia/index.htm, An on-line reference. Ver. 2.21Gascon, C., Population and community level analyses of species occurrences of central Amazonian rain forest tadpoles (1991) Ecology, 72, pp. 1731-1746Green, M.D., Sessions, S.K., Nomenclature for chromosomes (1991) Amphibian Cytogenetics and Evolution, pp. 431-432. , In: Green, D. M. and Sessions, S. K. (eds)Academic PressHero, J.M., An illustrated key to tadpoles occurring in the central Amazon rainforest, Manaus, Amazonas, Brasil (1990) Amazoniana, 11, pp. 201-262Hillis, D.M., The phylogeny of amphibians: Current knowledge and the role of cytogenetics (1991) Amphibian Cytogenetics and Evolution, pp. 7-31. , In: Green, D. M. and Sessions, S. K. (eds)Academic PressHowell, W.M., Black, D.A., Controlled silver-staining of nucleolus organizer regions with a protective colloidal developer: A 1 step method (1980) Experientia, 36, pp. 1014-1015Kaiser, H., Steinlein, C., Feichtinger, W., Chromosome banding of six dendrobatid frogs (Colostethus, Mannophryne) (2003) Herpetologica, 59, pp. 203-218King, M., C-banding studies on Australian hylid frogs: Secondary constriction structure and the concept of euchromatin transformation (1980) Chromosoma, 80, pp. 191-217King, M., Rofe, R., Karyotypic variation in the Australian gekko Phyllodactylus marmoratus (Gray) (Gekkonidae: Reptilia) (1976) Chromosoma, 54, pp. 75-87King, M., Contreras, N., Honeycutt, R.T., Variation within and between nucleolar regions in Australian hylid frogs (Anura) shown by 18S and 28S in-situ hybridization (1990) Genetica, 80, pp. 17-29León, P.E., Report of the chromosome numbers of some Costa Rican anurans (1970) Rev. Biol. Trop., 17, pp. 119-124Lima, A.P., Caldwell, J.P., A new Amazonian species of Colostethus with sky blue digits (2001) Herpetologica, 57, pp. 180-189Lourenço, L.B., Recco-Pimentel, S.M., Cardoso, A.J., Polymorphism of nucleolus organizer regions (NORs) in Physalaemus petersi (Amphibia, Anura Leptodactylidae) detected by silver staining and fluorescence in situ hybridization (1998) Chromosome Res., 6, pp. 621-628Lourenço, L.B., Recco-Pimentel, S.M., Cardoso, A.J., Two karyotypes, heteromorphic sex chromosomes and C-band variability in Physalaemus petersi (Anura, Leptodactylidae) (1999) Can. J. Zool., 36, pp. 301-306Lourenço, L.B., Garcia, P.C.A., Recco-Pimentel, S.M., Cytogenetics of two species of Paratelmatobius (Anura: Leptodactylidae), with phylogenetic comments (2000) Hereditas, 133, pp. 201-209Lynch, J.D., Two new species of poison-dart frogs (Colostethus) from Colombia (1982) Herpetologica, 38, pp. 366-374Meunier-Rotival, M., Cortadas, J., Macaya, G., Isolation and organization of calf ribosomal DNA (1979) Nucleic Acids Res., 6, pp. 2109-2123Miura, I., Two differential groups of the Japanese toad, Bufo japonicus japonicus, demonstrated by C-banding analysis of chromosome (1995) Caryologia, 48, pp. 123-136Miura, I., Nishioka, M., Borkin, L.J., The origin of the brown frogs with 2n = 24 chromosomes (1995) Experientia, 51, pp. 179-188Myers, C.W., Paolillo, A., Daly, J.W., Discovery of a defensively malodorous and nocturnal frog in the family Dendrobatidae: Phylogenetic significance of a new genus and species from the Venezuelan Andes (1991) Am. Mus. Novitates, 3002, pp. 2-33Rada De Martínez, D., Cariotipo de Colostethus trinitatis (Amphibia: Dendrobatidae) (1976) Acta Biol. Venez., 9, pp. 213-220Rasotto, M.B., Cardellini, P., Sala, M., Karyotypes of five species of Dendrobatidae (Anura: Amphibia) (1987) Herpetologica, 43, pp. 177-182Schmid, M., Chromosome banding in Amphibia I. Constitutive heterochromatin and nucleolus organizer regions in Bufo and Hyla (1978) Chromosoma, 66, pp. 361-368Schmid, M., Chromosome banding in Amphibia II. Constitutive heterochromatin and nucleolus organizer regions in Ranidae, Microhylidae and Rhacophoridae (1978) Chromosoma, 68, pp. 131-148Schmid, M., Chromosome banding in Amphibia V. Highly differentiated ZW/ZZ sex chromosomes and exceptional genome size in Pyxicephalus adspersus (Anura, Ranidae) (1980) Chromosoma, 80, pp. 69-96Schmid, M., Chromosome banding in Amphibia VII. Analysis of the structure and variability of NORs in Anura (1982) Chromosoma, 87, pp. 327-344Schmid, M., Steinley, C., Nanda, I., Chromosome banding in Amphibia (1990) Cytogenetics of Amphibians and Reptiles, pp. 21-45. , In: Olmo, E. (ed.)Birkhäuser VerlagSchmid, M., Feichtinger, W., Weimer, R., Chromosome banding in Amphibia. XXI. Inversion polymorphism and nucleolus organizer regions in Agalychnis callidryas (Anura, Hylidae) (1995) Cytogenet. Cell Genet., 69, pp. 18-26Silva, A.P.Z., Haddad, C.F.B., Kasahara, S., Nucleolus organizer regions in Physalaemus cuvieri (Anura, Leptodactylidae), with evidence of a unique case of Ag-NOR variability (1999) Hereditas, 131, pp. 135-141Sumner, A.T., A simple technique for demonstrating centromeric heterochromatin (1972) Exp. Cell Res., 75, pp. 304-306Veiga-Menoncello, A.C.P., Lima, A.P., Recco-Pimentel, S.M., Cytogenetics of two central Amazonian species of Colostethus (Anura, Dendrobatidae) with nidicolous tadpole (2003) Caryologia, 56, pp. 253-260Viegas-Péquignot, E., In situ hybridization to chromosomes with biotinylated probes (1992) In Situ Hybridization: A Practical Approach, pp. 137-158. , In: Willernson, D. (ed.)Oxford Univ. Press, IRL PressWiley, J.E., Little, M.L., Romano, M.A., Polymorphism in the location of the 18S and 28S rDNA genes on the chromosomes of the diploid-tetraploid treefrogs Hyla chrysoscelis and Hyla versicolor (1989) Chromosome, 97, pp. 481-48

Cosmological models with linearly varying deceleration parameter

We propose a new law for the deceleration parameter that varies linearly with time and covers Berman's law where it is constant. Our law not only allows one to generalize many exact solutions that were obtained assuming constant deceleration parameter, but also gives a better fit with data (from SNIa, BAO and CMB), particularly concerning the late time behavior of the universe. According to our law only the spatially closed and flat universes are allowed; in both cases the cosmological fluid we obtain exhibits quintom like behavior and the universe ends with a big-rip. This is a result consistent with recent cosmological observations.Comment: 12 pages, 7 figures; some typo corrections; to appear in International Journal of Theoretical Physic

Frictional drag between non-equilibrium charged gases

The frictional drag force between separated but coupled two-dimensional electron gases of different temperatures is studied using the non-equilibrium Green function method based on the separation of center-of-mass and relative dynamics of electrons. As the mechanisms of producing the frictional force we include the direct Coulomb interaction, the interaction mediated via virtual and real TA and LA phonons, optic phonons, plasmons, and TA and LA phonon-electron collective modes. We found that, when the distance between the two electron gases is large, and at intermediate temperature where plasmons and collective modes play the most important role in the frictional drag, the possibility of having a temperature difference between two subsystems modifies greatly the transresistivity.Comment: 8figure