The integral surface 2

Calculate the integral $\int \int_{ \alpha} f(x,y,z) ds$ in surface. $\alpha$ is represented by function vector $r(u,v)$

$f(x,y,z) = \frac{1}{ \sqrt{1+4x^2+4y^2}}$
$r(u,v) = ucosv i + usenv j + u k$
$(0 \leq u \leq senv, 0 \leq v \leq \pi)$