"to closely study" is a perfectly correct and usable phrase in written English.
You can use it when you want to emphasize that a person should pay very close attention when studying something, such as a topic, text, or idea. For example: "The students were instructed to closely study the chapter before the upcoming exam."
They also used CT scanning to closely study the embedded bone point to confirm that it was a hunting tool.
In a nod to Apple's work with aluminum, Microsoft began to closely study materials that could be used to create a distinctive case for a tablet.
The unfolding Japanese tragedy also should prompt Americans to closely study our own plans for coping with natural disasters and with potential nuclear plant accidents to make sure they are, indeed, strong enough.
To closely study the accuracy of FSDT in estimating (B_{6}), numerical results for the ratio (bar{B}_{6}) according to FSDT and LWT are obtained and are presented in Table 2 for different width-to-thickness ratios and various general cross-ply laminates.
It's also important to closely study what each MBA program offers.
It allowed him to closely study the people around him and also to transcend his attachment to those people.
Experts plan further excavations at the site where they believe Atlantis is located and at the mysterious "cities" in central Spain 150 miles away to more closely study geological formations and to date artifacts.
Future studies should aim to test dogs younger than 6 months, in order to more closely study the ontogeny of gaze following.
Researchers made the discovery after developing a special microphone array to more closely study the tunes of male mice, which range from 35 to 125 kilohertz (kz)—far higher than the maximum frequency heard by humans (20 kz).
We used five-year data from the National Ambulatory Medical Care Survey (NAMCS) to more closely study the sociodemographic and geographic characteristics associated with patient visits to DOs for primary care services.
In order to more closely study the interactions between obestatin and TNF- α on clinical outcomes in our cohort, different groups with high and low concentrations were established according to median obestatin and TNF- α levels and were cross-classified.
