Theoretical modeling of spatial and temperature dependent exciton energy in coupled quantum wells

Motivated by a recent experiment of spatial and temperature dependent average exciton energy distribution in coupled quantum wells [S. Yang \textit{et al.}, Phys. Rev. B \textbf{75}, 033311 (2007)], we investigate the nature of the interactions in indirect excitons. Based on the uncertainty principle, along with a temperature and energy dependent distribution which includes both population and recombination effects, we show that the interplay between an attractive two-body interaction and a repulsive three-body interaction can lead to a natural and good account for the nonmonotonic temperature dependence of the average exciton energy. Moreover, exciton energy maxima are shown to locate at the brightest regions, in agreement with the recent experiments. Our results provide an alternative way for understanding the underlying physics of the exciton dynamics in coupled quantum wells.Comment: 8 pages, 5 figure

Violation of energy-per-hadron scaling in a resonance matter

Yields of hadrons, their average masses and energies per hadron at the stage of chemical freeze-out in (ultra)relativistic heavy-ion collisions are analyzed within the statistical model. The violation of the scaling / = 1 GeV observed in Au+Au collisions at $\sqrt{s}$ = 130 AGeV is linked to the formation of resonance-rich matter with a considerable fraction of baryons and antibaryons. The rise of the energy-per-hadron ratio in baryon-dominated matter is discussed. A violation of the scaling condition is predicted for a very central zone of heavy-ion collisions at energies around 40 AGeV.Comment: 5 pages incl. 3 figures and 2 tables, to be published in Phys. Rev.

A Detection Method for Tropical Race 4 of the Banana Pathogen Fusarium oxysporum f. sp. cubense

Fusarium oxysporum f. sp. cubense (Foc) is the causal agent of Fusarium wilt, the devastating disease that ruined the ‘Gros Michel’ (AAA)-based banana production in the first half of the 20th century. The occurrence of a new variant in Southeast Asia that overcomes the resistance in Cavendish clones such as ‘Grand Naine’ (AAA) is a major concern to current banana production worldwide. The threat posed by this new variant, called tropical race 4 (TR4), may be overcome by the introduction of resistant cultivars. However, the identification of new resistant sources or breeding for resistance is a long-term effort. Currently, the only option to control the disease is to avoid or reduce the spread of the pathogen by eradication of infected plants and isolation of infested plantations. This requires sensitive and highly specific diagnostics that enable early detection of the pathogen. A two-locus database of DNA sequences, from over 800 different isolates from multiple formae speciales of F. oxysporum, was used to develop a molecular diagnostic tool that specifically detects isolates from the vegetative compatibility group (VCG) 01213, which encompasses the Foc TR4 genotype. This diagnostic tool was able to detect all Foc TR4 isolates tested, while none of the Foc isolates from 19 VCGs other than 01213 showed any reaction. In addition, the developed diagnostic tool was able to detect Foc TR4 when using DNA samples from different tissues of ‘Grand Naine’ plants inoculated with TR4 isolate

Regular vs. classical M\"obius transformations of the quaternionic unit ball

The regular fractional transformations of the extended quaternionic space have been recently introduced as variants of the classical linear fractional transformations. These variants have the advantage of being included in the class of slice regular functions, introduced by Gentili and Struppa in 2006, so that they can be studied with the useful tools available in this theory. We first consider their general properties, then focus on the regular M\"obius transformations of the quaternionic unit ball B, comparing the latter with their classical analogs. In particular we study the relation between the regular M\"obius transformations and the Poincar\'e metric of B, which is preserved by the classical M\"obius transformations. Furthermore, we announce a result that is a quaternionic analog of the Schwarz-Pick lemma.Comment: 14 page

The accuracy of merging approximation in generalized St. Petersburg games

Merging asymptotic expansions of arbitrary length are established for the distribution functions and for the probabilities of suitably centered and normalized cumulative winnings in a full sequence of generalized St. Petersburg games, extending the short expansions due to Cs\"org\H{o}, S., Merging asymptotic expansions in generalized St. Petersburg games, \textit{Acta Sci. Math. (Szeged)} \textbf{73} 297--331, 2007. These expansions are given in terms of suitably chosen members from the classes of subsequential semistable infinitely divisible asymptotic distribution functions and certain derivatives of these functions. The length of the expansion depends upon the tail parameter. Both uniform and nonuniform bounds are presented.Comment: 30 pages long version (to appear in Journal of Theoretical Probability); some corrected typo

Symmetry of the Schr\"odinger equation with variable potential

We study symmetry properties of the Schr\"odinger equation with the potential as a new dependent variable, i.e., the transformations which do not change the form of the class of equations. We also consider systems of the Schr\"odinger equations with certain conditions on the potential. In addition we investigate symmetry properties of the equation with convection term. The contact transformations of the Schr\"odinger equation with potential are obtained

The role of utilitarian and hedonic aspects in the continuance intention to use social mobile apps

The purpose of this research is to understand the main factors that determine users’ continuance intention to use social mobile Apps, considering two utilitarian (i.e., perceived usefulness, perceived ease of use) variables and a hedonic (i.e., perceived enjoyment) variable. As social mobile Apps may be utilitarian or hedonic, we aim to evaluate possible differences in the significance of the aforementioned antecedent factors in utilitarian Apps (i.e., TripAdvisor) and hedonic Apps (i.e., Instagram). The data were collected from an international sample of users; the Partial Least Squares method was applied to analyze the research model, using SMARTPLS 3.0. To analyze the moderating effects, a multi-group PLS analysis was carried out to compare the differences between the path relationships in the two Apps. The results show that continuance intention to use is explained by perceived usefulness, perceived ease of use, perceived enjoyment, satisfaction and user experience (control variable), and the impact of utilitarian variables is generally greater for utilitarian Apps, whereas the impact of perceived enjoyment is higher for hedonic Apps. This study contributes to the general body of knowledge about mobile Apps by providing a comprehensive theoretical foundation and practical implications that illuminate the continuance use of social mobile Apps

Feeding Disorders In Children With Gastro-esophageal Reflux Disease

Background: feeding/eating disorders are frequent in pediatric patients and, in some cases, can be associated to an upper digestive motility disorder. Gastro-esophageal reflux is, nowadays, considered a risk factor for the development of feeding/eating disorders. Aim: to verify the occurrence of feeding/eating disorders in patients with Gastro-Esophageal Reflux Disease (GERD) determined by the 24-H esophageal pH monitoring evaluation. Method: an analytical observational cross-sectional study of the stomathognatic system and feeding/eating behavior in healthy children and in children with GERD. Results: 25 children (ages 45,68 ± 34,22 months; mean ± SD) with the diagnosis of GERD determined by the 24-H esophageal pH monitoring evaluation and 40 children (ages 60,65 ± 36,07 months; mean ± SD) randomized from their school group. The criteria for the pH monitoring were: vomiting, regurgitation, wheezing and recurrent pneumonia. There was no significant difference in age mean between groups. Children with GERD presented an significantly higher frequency (p<0.05) of feeding/eating problems (F/EP) and of oral motor-sensory disturbances (sucking, chewing and swallowing). Behavioral F/EP was present in 44% of the cases and oral motor-sensory F/EP in 80%. About 64% of the children had a history of feeding/eating complaints, 36% presented an extended feeding/eating time, 68% presented problems in the development of the oral feeding patterns and 60% presented alterations in the nasal breathing pattern. Conclusion: children with GERD presented a higher prevalence of behavioral and stomathognatic feeding/eating problems when compared to healthy children.1915966AHMAD, I., BATH, A.J.G., Acid reflux management: ENT perspective (2004) J. Laryngol. Otol, 118, pp. 25-30. , Birmingham UK, v, janBURKLOW, K. A.PHELPS, A. N.SCHULTZ, J.MCCONNELL, K.RUDOLPH, C. Classifying complex pediatric feeding disorders. J. Pediatr. Gastroenterol. Nutr., Philadelphia, v. 27, n. 2, p. 143-147, ago. 1998CATTONI, D.M., ANDRADE, D.R.F., ZACKIEWICZ, D.M., NEIVA, F.C.B., Levantamento da consistência do alimento recebido no primeiro ano de vida (2001) R. Soc. Bras. Fonoaudiol, 6 (1), pp. 59-64. , São Paulo, v, junCOOPER, P.J., WHELAN, E., WOOLGAR, M., MORRELL, J., MURRAY, L., Association between childhood feeding problems and maternal eating disorder: Role of the family environment (2004) Br. J. Psychiatry, 184, pp. 210-215. , Londres, v, marDELLERT, S.F., HYAMS, S.J., WILLIAM, R.T., GEERTSMA, A., Feeding resistance and gastroesophageal reflux in infancy (1993) J. Pediatr. Gastroenterol. Nutr, 17 (1), pp. 66-71. , Philadelphia, v, aprDOUGLAS, J.E., BYRON, M., Interview data on severe behavioral eating difficulties in young children (1996) Arch. Dis. Child, 75 (4), pp. 304-308. , Nova York, v, octFERRIOLI, E., OLIVEIRA, R.B., MATSUDA, N.M., BRAGA, F.J., DANTAS, R.O., Aging, esophageal motility and gastroesophageals reflux (1998) J. Am. Geriatr. Soc, 46 (12), pp. 1534-1537. , Nova York, v, decGILLESPIE, A.H., ACTERBERG, C.L., Comparison of family interaction patterns related to food and nutrition (1989) J. Am. Diet. Assoc, 89 (4), pp. 509-512. , Chicago, v, abrGOLDANI, H.A.S., (1999) Motilidade do trato digestivo superior em crianças com problemas de alimentação e refluxo gastroesofágico, , 99 f. Tese Doutorado em puericultura e pediatria, Faculdade de Medicina, Universidade de São Paulo. Ribeirão PretoJUNQUEIRA, P.COSTA, M. M. B. Protocolo para avaliação videofluoroscópica da dinâmica da fase oral da deglutição de líquido. Pró-Fono R. Atual. Cient., Carapicuíba (SP), v. 13, n. 2, p. 165-168, set. 2001JUNQUEIRA, P. A. de S.FRANCESCO, R. C. D.TREZZA, P.ZERATTI, F. E.FRIZZARINI, R.FARIA, M. E. J. de. Alterações funcionais do sistema estomatognático pré e pós-adenoamigdalectomia. Pró-Fono R. Atual. Cient., Carapicuíba (SP), v. 4, n. 1, p. 17-22, jan.-abr. 2002MADEIRA, I.R., AQUINO, L.A., Problemas de abordagem dificil: "não come" e "não dorme (2003) J. Pediatr, 79 (SUPL. 1), pp. S43-S54. , Rio de Janeiro, v, mayMANIKAN, R., PERLMAN, J.A., Pediatric feeding disorder (2000) J. Clin. Gastroenterol., New York, 30 (1), pp. 34-46. , janMARCHESAN, I.Q., (1998) Uma visão compreensiva das práticas fonoaudiológicas: A influência da alimentação no crescimento e desenvolvimento craniofacial e nas alterações miofuncionais, , São Paulo: Pancast, 238 pMARCHESAN, I.Q., Avaliação e terapia dos problemas da respiração (1998) Fundamentos da fonoaudiologia: Aspectos clínicos da motricidade oral, pp. 23-26. , Rio de Janeiro: Guanabara KooganMEIRA, R. R. S. Refluxo gastroesofágico: uma demanda na clínica pediátrica e a intervenção fonoaudiológica. In: MARCHESAN, I. Q.ZORZI, J. L.GOMES, I. C. D. (Org). Tópicos em fonoaudiologia. São Paulo: Lovise, 1998. p. 479-487MORALLES, R. C. O. Sucção, deglutição e mastigação fisiológicas. In: MORALLES, R. C. O. Terapia de regulação orofacial: conceito RMC. São Paulo: Memnon, 2002. p. 45-56MORRIS, S.E., KLEIN, M.D., (2000) Pre-feeding skills: A comprehensive resource for mealtime development, pp. 31-41. , 2. ed. Arizona USA, Therapy Skill BuildersMOTTA, A. R.COSTA, H. O. de O. A mastigação no período intertransicional da dentição mista. R. Dent. Press. Ortodon. Ortoped. Facial, Maringá (PR), v. 7, n. 5, p. 77-86, set-out. 2002NELSON, S.P., CHEN, E.H., SYNIAR, G.M., CHRISTOFFEL, K.K., One-year follow-up of symptoms of gastroesophageal reflux during infancy (1998) Pediatrics, 102, pp. 1470-1481. , Springfield, v, dezRABINOWITZ, S.S., PIECUCH, S., JIBLY, R., GOLDSMITH, A., SCHWARZ, S.M., Optimizing the diagnosis of gastroesophageal reflux in children with otolaryngologic symptoms (2003) Int. J. Pediatr. Otorhinolaryngol, 67 (6), pp. 621-626. , Amsterdam, v, junRAMSAY, M., GISEL, E.G., McCUSKER, J., BELLAVANCE, F., PLATT, R., Infant sucking ability, nonorganic failure to thrive, maternal characteristics, and feeding practices: A prospective cohort study (2002) Dev. Med. Child. Neurol, 44 (6), pp. 405-414. , London, v, junRICHTER, J.E., Ear, nose and throat and respiratory manifestations of gastro-esophageal reflux disease: An increasing conundrum (2004) Eur. J. Gastroenterol. Hepatol, 16 (9), pp. 837-845. , London, v, sepROMMEL, N., DE MEYER, A.M., FEENSTRA, L., VEEREMAN-WAUTERS, G., The complexity of feeding problems in 700 infants and young children presenting to a tertiary care institution (2003) J. Pediatr. Gastroenterol. Nutr, 37 (1), pp. 75-84. , New York, v, marRUDOLPH, C.D., MAZUR, L.J., LIPTAK, G.S., BAKER, R.D., BOYLE, J.T., COLLETTI, R.B., GERSON, W.T., WERLIN, S.L., Guidelines for evaluation and treatment of gastroesophageal reflux in infants and children: Recommendations of the North American Society for Pediatric Gastroenterology and Nutrition (2001) J. Pediatr. Gastroenterol. Nutr, 32 (SUPPL. 2), pp. S1-31. , New York, vRUDOLPH, C.D., LINK, D.T., Feeding disorder in infants and children (2002) Pediatr. Clin. North Am, 49 (1), pp. 97-112. , Philadelphia, v, febSOMANI, S.K., GHOSHAL, U.C., SARASWAT, V.A., AGGARWAL, R., MISRA, A., KRISHNAMI, N., NAIK, S.R., Correlation of esophageal pH and motor abnormalities with endoscopic severity of reflux esophagius. Dis. Esophagus (2004) New York, 17 (1), pp. 58-62. , aprSOUZA, L. P. de.BITAR, M. L. Alimentação de lactentes com refluxo gastresofágico (RGE). Pró-Fono R. Atual. Cient., Barueri (SP), v. 15, n. 2, p. 117-124, ago. 2003STAIANO, A., Food refusal in toddlers with chronic diseases (2003) J. Pediatr. Gastroenterol. Nutr, 37 (3), pp. 225-227. , Philadelphia, v, sepSTRUDWICK, S. Gastro-oesophageal reflux and feeding: the speech and language therapist's perspective. Int. J. Pediatr. Otorhinolaryngol., Amsterdam, v. 67, n. 1, p. S101-S102, dec. 2003. suppl. 1SUSS-BURGHART, H., Feeding disorders and failure to thrive in small and/ or handicapped children (2000) Z. Kinder Jugendpsychiat. Psychother, 28 (4), pp. 285-296. , Alemanha, v, novTUCHMAN, D. N. Disorders of deglutition. In: WALKER, W. A.DURIE, P. R.HAMILTON, J. R.WALKER-SMITH, J. A.WATKINS, J. B. Pediatric Gastrintestinal Disorders. Ontário (Canadá): BC Decker Inc Hamilton, 2000. p. 277-288YUAN, Q.WINTER, H. S. Gastroesophageal reflux in children. In: FASS, R. GERD: dyspepsia. Filadélfia: Hanley & Belfus Inc, 2004. p. 289-25

Understanding Consumer Interaction on Instagram: The Role of Satisfaction, Hedonism, and Content Characteristics

The increasing relevance of Instagram and its growing adoption among top brands suggest an effort to better understand consumers'' behaviors within this context. The purpose of this study is to examine the role of perceived hedonism and satisfaction in determining consumers'' intentions to interact and their actual interaction behaviors (the number of likes, by tapping a heart icon, and comments) in a brand''s official Instagram account. Also, we investigate the effect of consumer perceptions about the characteristics of the content generated in the account (perceived originality, quantity, and quality) on their perceived hedonism and satisfaction. Data were collected in two stages from 808 members of a fashion brand''s official Instagram account. First, participants answered an online questionnaire to evaluate their perceptions, satisfaction, and interaction intentions. Second, 1 month later, we measure the number of likes and comments done by each participant in the brand''s official Instagram account during that month. Using partial least squares to analyze the data, perceived hedonism is found to affect both satisfaction and the intention to interact in Instagram, which in turn influences actual behavior. Besides, perceived originality is the most relevant content characteristic to develop perceived hedonism. These findings offer managers a general vision of consumers'' behaviors on Instagram, highlighting the importance of hedonism to create a satisfactory experience

Density fluctuations from warm inflation

Thermal fluctuations provide the main source of large scale density perturbations in warm inflationary models of the early universe. For the first time, general results are obtained for the power spectrum in the case when the friction coefficient in the inflaton equation of motion depends on temperature. A large increase in the amplitude of perturbations occurs when the friction coefficient increases with temperature. This has to be taken into account when constructing models of warm inflation. New results are also given for the thermal fluctuations in the weak regime of warm inflation when the friction coefficient is relatively small.Comment: 14 pages, 4 figures, ReVTe