Can anyone tell me what kind of narrator is used in these excerpts?

If it refers to the scientist who is the main character, then it's a first-person point of view. You can also tell it's first-person if "I" "my" "me" "mine" etc. is used a lot. If no "I"'s are used, then it's probably a third-person point of view. A little research on the internet can help you find out what you need to know as well.