Hello Dr. Mishra,
Sorry for the late reply. Actually, we have hidden Google advertisements in all pages for our "active members" in order to avoid all sorts of accidental clicks on our own advertisements. You may be well aware that we run a risk of getting our AdSense accounts disabled if we click on our own advertisements. But sometimes it happens accidentally and unintentionally.
This is why we have used an internal algorithm to determine whom we will call our "active members" (we would not disclose that to avoid fraudulence). These active members will not be able to see the ads as those will be hidden for them. However, rest assured that the ads are visible to the external visitors of this site, and are generating revenue in the regular basis as well.