Liver cancer: A geometric approach to fractals and scaling analysis.

In the study of liver cancer, invasive techniques such as computed tomography (CT) and magnetic resonance imaging (MRI) are used. In the present work, an in vivo 3D study will be carried out using MRI and CT images, using scaling dynamics, that is, calculating critical exponents of local roughness and fractal dimension. The results obtained for stages IA, IIA, and IIIA in liver cancer correspond to what was proposed by F. Family and T. Vicsek (1991).

Breast cancer: A fractal approach, scaling analysis and quantum cluster algorithm.

Tumor growth in the breast is a complex process, understanding this type of phenomenon is important in order to establish adequate strategies at diagnostic and therapeutic levels, beginning with the evaluation morphology, through adequate descriptors. Scaling analysis is used to extract parameters such as exponents of local roughness and fractal dimension, which characterize tumor growth. The results show that invasive lobular and ductal tumors in situ behave as proposed by Family-Vicsek (Family and Vicsek, 1991), while benign tumors behave differently.

Prevalencia de vida de uso de cannabis y rendimiento académico en adolescentes / Lifetime prevalence of cannabis use and academic performance in adolescents

Objetivo: Esta investigación compara y establece las diferencias en la prevalencia de vida (consumo alguna vez en la vida) y no prevalencia de vida de uso de cannabis sobre el rendimiento académico en adolescentes escolarizados. Método: En este estudio descriptivo de corte transversal se seleccionó una muestra probabilística de 156 estudiantes y fueron evaluados con una prueba ad hoc de autopercepción. Las técnicas estadísticas utilizadas fueron análisis de frecuencia, descriptivos, t- student, U de Mann Whitney y Chi². Resultados: Los resultados señalan diferencias entre los grupos de prevalencia de uso de cannabis y no prevalencia de uso de cannabis en el número de cursos repetidos, días castigados en el último mes, la nota promedio del último mes, problemas escolares y la preocupación por estos, y dificultades para controlar el comportamiento en los últimos seis meses. No hubo diferencias en la comparación entre hombres y mujeres del grupo de prevalencia de uso de cannabis. Se confirma que el cannabis afecta el rendimiento académico desde algunos factores específicos que afectan por igual a hombres y mujeres. Conclusión: Se concluye que entre el grupo de prevalencia de vida de uso de cannabis hay más repetidores, a su vez, han repetido más cursos, han recibido más castigo en el colegio, tienen calificaciones más bajas, han tenido más problemas escolares y han estado más preocupados respecto a estos, y una mayor dificultad en controlar el comportamiento. En relación con el género no hay diferencias en las consecuencias sobre el rendimiento académico después de probar cannabis.

Objective: This research compares and establishes the differences in the prevalence of life (consumption ever in life) and no lifetime prevalence of cannabis use on academic performance in school adolescents. Method: In this descriptive and cross sectional study 156 students were probabilistically selected and evaluated with an ad-hoc auto-perception test. The techniques used were frequency analysis, descriptive, student t, Mann Whitney and Chi2. Results: The results show differences between groups in the prevalence of cannabis use and no prevalence of cannabis in the number of repeated courses, days punished in the past month, the average of the last month note, school problems and concern for these and difficulty controlling behavior in the past six months. There were no differences in the comparison between men and women in the group prevalence of cannabis use. It confirms that cannabis affects academic performance from some specific factors that affect both men and women. Conclusion: It is concluded that the group of lifetime prevalence of cannabis use more repeaters in turn have repeated more courses, have received more punishment in school, they have lower grades, have more problems in school and have been more worried about these, and greater difficulty in controlling behavior, and that there are no gender-related differences in the effects on academic performance after trying cannabis.