Floating boom performance under waves and currents.

Floating booms constitute a fundamental tool for the protection of marine and coastal ecosystems against accidental oil spills. Their containment performances in exposed areas are often impaired by the action of waves, currents and winds in a manner which is dependent on the boom's response as a floating body, and which is not fully understood at present. In this work the relationship between the design parameters of a floating boom section and its efficiency against the mode of failure by drainage under a variety of wave and current combinations is investigated by means of physical modelling. Seven boom models with different geometries and buoyancy-weight ratios are tested with an experimental setup that allows them to have and rotate freely. The model displacements under waves (both regular and irregular) and currents, as well as those of the free surface adjacent to the model, are measured with a Computer Vision system developed ad hoc. Two efficiency parameters are defined-the significant and minimum effective boom drafts-and applied to the results of an experimental campaign involving 315 laboratory tests. Thus, the manner in which the design parameters influence the boom's efficiency under different wave and current conditions is established.

Adenoma velloso de apéndice. Actitud diagnóstica y terapéutica / Villous adenoma of the appendix. Diagnostic and therapeutic approach

El adenoma velloso de apéndice es una entidad patológica rara que adopta formas de presentación clínica que difieren de la de los adenomas vellosos en otras localizaciones del tubo digestivo. Pacientes y métodos: hemos revisado los casos de adenoma velloso apendicular que se han diagnosticado en nuestro hospital en un periodo de tiempo de cinco años. Se estudia la distribución por edades, sexo, las formas de presentación clínica, los métodos diagnósticos empleados, el tratamiento efectuado y el seguimiento realizado. Resultados: se han diagnosticado un total de seis casos de adenoma velloso apendicular siendo la forma de presentación clínica más habitual la apendicitis aguda. Los tratamientos aplicados fueron apendicectomía en 2 casos, hemicolectomía derecha en 2 pacientes, colectomía subtotal en un paciente y Hartmann más apendicectomía en otro caso. Conclusiones: consideramos que la apendicectomía será el tratamiento de elección siempre que no haya degeneración maligna del adenoma y que este no invada el borde de resección quirúrgica (AU)

Villous adenoma of the appendix. Diagnostic and therapeutic approach.

UNLABELLED: Appendix villous adenoma is a rare pathological entity that shows a particular form of clinical presentation that is different from villous adenomas in other places along the gastrointestinal tract. PATIENTS AND METHODS: We reviewed cases of appendix villous adenoma diagnosed in our hospital during the last five years; we studied age, distribution, sex, clinical presentation, diagnostic methods used, treatment and follow-up of patients. RESULTS: We diagnosed 6 cases of villous adenoma of the appendix, acute appendicitis being the most common form of clinical presentation. Treatment was appendectomy in two cases, right hemicolectomy in two patients, subtotal colectomy in one case, and Hartmann's technique with appendectomy in one more case. CONCLUSIONS: We consider appendectomy the treatment of choice when no malignant degeneration is present in the adenoma and invasion of surgical resection borders is absent.