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First and second order rational solutions to the Johnson equation and rogue waves
2018
Rational solutions to the Johnson equation are constructed as a quotient of two polynomials in x, y and t depending on several real parameters. We obtain an infinite hierarchy of rational solutions written in terms of polynomials of degrees 2N (N + 1) in x, and t, 4N (N + 1) in y, depending on 2N − 2 real parameters for each positive integer N. We construct explicit expressions of the solutions in the cases N = 1 and N = 2 which are given in the following. We study the evolution of the solutions by constructing the patterns of their modulus in the (x, y) plane, and this for different values of parameters.
Mediating Effects of Global Negative Effect Expectancies on the Association between Problematic Cannabis Use and Social Anxiety
2017
The relationship between social anxiety and cannabis use among adolescents and young adults is a highly debated topic. In this cross-sectional study, we tested whether cannabis use expectancies mediated the association between social anxiety and cannabis use severity in a sample of 343 young adults (74.3% male) who used cannabis. They completed self-report measures for the screening of problematic cannabis use (Cannabis Use Problems Identification Test) and social anxiety symptoms (Social Interaction Anxiety Scale and Social Phobia Scale). A multiple mediation analysis was used to test whether marijuana effect expectancies mediate social anxiety effect on problematic cannabis use. Social an…
Pētera Šmita sarakste ar latviešu un lietuviešu filologu, etnogrāfu Eduardu Volteri
1917
Vēstulē P. Šmite pateicas par saņemtajiem materiāliem, lūdz atsūtīt citus, arī pazaudēto "Литовские свадебные народные песни = Lietuviškos svotbinės dajnos", kuras pierakstījis Antanas Juška (Антон Юшкевич), kā arī spriež par dažādu vārdu, piemēram, "bajārs" u.c. parādīšanos latviešu tautas folklorā, salīdzina tos ar citām valodām.