The document summarizes two research studies: 1) A study on the sedimentation process of cassava starch slurry in channels used by small agricultural industries in Colombia. It found that discrete particle settling predominated, with laminar flow and over 150 minutes of hydraulic retention time. Particles over 10 μm were efficiently retained in the first 104m, while smaller particles were discharged. 2) A study on the relationship between age of sexual debut and sexual behaviors in Spanish adolescents. It found those with early debut (<15 years) engaged in riskier behaviors like multiple partners and less condom use, suggesting early debut increases health risks.

1. DANIEL ANDRES CASTAÑEDA MOLINA 11-1 J.M
LIC. EN INGLES MARINA VIANA MUÑOZ.

3. • Un abstract o resumen del trabajo científico es la parte más importante
de tu trabajo de investigación.
• Se redacta en tercera persona y en pasado haciendo referencia a la
investigación realizada.
• Tiene contenido significativo y conclusiones del material de fuente
primaria.
• Debe ser inteligible, es decir, esplique el estudio sin necesidad de
referirse a la investigación completa pero no la sustituye.

4. Su estructura es organizada:
• Background/ antecedentes
• aim or purpose of research/ objetivo o propósito de la investigación
• method used/ método utilizado
• Findings, results/ hallazgos / resultados
• conclusion/conclusión

5. 1-Background/ antecedentes
The production of cassava starch in Colombia
comes mainly from the northern region of the
Cauca Department in small agricultural industries
known as “rallanderías”, in which the settling of the
slurry occurs in channels.

6. 2-aim or purpose of research/ objetivo o propósito
de la investigación
the fact that the settling process determines the
capacity of the starch industry, it is important to
evaluate the sedimentation process performed in
rectangular channels (0.3 m high; 0.4 m wide; 165 m
long), which are generally used in the region.

7. 3-method used/ método utilizado
Two main components were evaluated: determination
of the change in the concentration of the slurry
entering the settling zone and determination of the
particle size distribution in the settling zone.

8. 4-Findings, results/ hallazgos / resultados
In relation to the affluent of the channels, it was
found that the concentration of the slurry during
strainer operation was between 0.1 to 6% most of
the time; the settling of discrete particles, for which
the Stokes Law may be applied, predominated.
During the settling process, the flow varied between
0.82 to 1.44 L/s with a predominance of laminar flow
and a hydraulic retention time greater than 150
minutes.

9. 5-conclusion/conclusión
it was concluded that In the first 104m of the
channel, particles greater than 10 μm in size were
efficiently retained; particles between 6,7 to 8,8μm
were not retained and were discharged into local
bodies of water, generating environmental
problems.

10. 1-Background/ antecedentes
In Spain young people have their first sexual
intercourse at an earlier age than in other countries;
however, little is known about the relationship
between age of sexual debut and sexual behavior
in this population.

11. 2-aim or purpose of research/ objetivo o propósito
de la investigación
was analyzed sexual practices and methods of
protection depending on the age of sexual debut
among Spanish adolescents who are sexually
experienced (N = 351).

12. 3-method used/ método utilizado
It was found the mean age was 15.9 years (SD = .75,
range: 14-18). Three groups were formed according
to the age of sexual debut reported: early sexual
debut (earlier than 15 years), average (15 years)
and late (later than 15 years).

13. 4-Findings, results/ hallazgos / resultados
The early sexual debut group reported further
mutual masturbation, vaginal intercourse and oral
sex with a higher number of sexual partners than the
rest. Condom use at first intercourse, percentage of
use and consistent condom use was significantly
lower in the early sexual debut group compared to
the others. Sexual debut before 15 years old was
associated with increased risk of sexual infections,
deficit in condom use and increased sexual
exposure.

14. 5-conclusion/conclusión
The findings of this study suggest that the age of
sexual debut has implications for the sexual health
in young people.