The document discusses two separate topics. The first is about evaluating sedimentation processes in rectangular channels used in the cassava starch industry in Colombia. It found that particles larger than 10um were efficiently retained in the first 104m of the channels, while particles between 6.7-8.8um were discharged. The second topic examines the sexual risks for adolescents based on the age of sexual debut. It found that those with early sexual debut (before 15 years old) reported more masturbation, intercourse and oral sex with more partners than those with later debut, and were associated with increased risk of infections if protection was not used. The conclusion was that the age of sexual debut impacts youth sexual health.

1. IVAN RIVERO
11-3 jm
intitucion educativa
nacional agustin codazzi

2. Parts asbtract
Background
Aim or purpose of research
Methods used
Finding/results
conclusion

3. Background:
The production at cassava starch in colombia comes
mainly from the northern region of the cauca
departament in small communities agricultural
industries known as “rallanderias”.

4. Aim or purpose of research
 the fact that the setting process determined, the
capacity of the starch industry, it is important to
evaluate the sedimentation process performed in
rectangular channels (0,3m high 0,4m wide; 165
long).

5. methods
 it is importante to evaluate the sedimentación
procesos performed un rectangular channers (0.3 m
high 0.4 m wide 165 m long)

6. results
in relation to the affluent of the channel it was found
that the concentration of the story doing strainer
operation was between 0.1 a 6% of the time setting
of discrete particles the store low most be applied
predominate ouring the setting process the flow.

7. conclusion
 In the firs 104m of the channels particles, greater
than 10nm in size were efficiently retained ;
particles between 6,7 to 8,8pm were not retained and
were discharged, into local bodies of water,
generating enuiromental

8. Sexual risk in adolescents
depending on the age of
sexual debut

9. background
 the mean ave das 15:9 years (sd 75 range 14-18 )
three groups were formes according to the ave of
sexuasl debut reportes :early sexual debut (earlier
that 15 year ) average (15 years) AMD late ( later
than 15 years).

10. Aim or purpose of research
 the early sexual debut group reportes further mutual
masturbation, vaginal intercourse and oral sed with a
higher number of sexual partners than the rest.

11. methods
 sexual practices and methods of protection are
analized depending on the age of sexual debut
among spanish adolescents who are sexualy
experiencias.

12. results
 sexual debut before is yours old was asociated with
increased risk of sexual infections déficit un carecían
use and mercased sexual exesive.

13. conclusion
 the findings of this study suggest that the age of
sexual debut has implications for the sexual health in
young people

14. GRACIAS…
 PRIDE OF LONDON CHELSEA
 MARINA I LOVO YOU