https://www.selleckchem.com/pr....oducts/FK-506-(Tacro
Four ways archaeologists have tried to gain insights into how flintknapping creates lithic variability are fracture mechanics, controlled experimentation, replication and attribute studies of lithic assemblages. Fracture mechanics has the advantage of drawing more directly on first principles derived from physics and material sciences, but its relevance to controlled experimentation, replication and lithic studies more generally has been limited. Controlled experiments have the advantage of being able to isolate and quantify

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To evaluate the effects of virtual reality (VR) training on different parameters of vision. Sixty individuals ranged 18-60 years old with asthenopia were randomly divided into short-term ( =4 and long-term ( =2 treatment groups. They were given a specially designed VR training device only once for 15min or 3-4 times a day for 15min each time for 1mo. The visual acuity, spherical equivalent, accommodative range, accommodative facility, pupil size, and visual fatigue were evaluated before (control) and after VR training. The visual ac