this paper presents noise problems associated with the use of air-turbine drills in dental practice. two hundred and fifty dentists (male and female) were randomly selected from the faculty of dentistry as well as the dentists who worked private in tehran. the results indicated that the mean value of sound pressure level produced by the high-speed drills was 69.1 db. most of the energy from the...

Heinrich Scholz (1884–1956) was a German Protestant theologian, philosopher and logician who established the study of logic as an independent subject by founding Germany’s first research institute for logic, in Munster. Since he also contributed to historiography well acquainted with work Paul Hertz Gerhard Gentzen. (For further information on cf. Peckhaus, V. (2018). Scholz. In: The Stanford E...

The present investigations on sealability evaluation for tubing and casing premium connections depend the FEM with testing. This paper proposed a theoretical model to evaluate of sphere-type connection based make-up torque, which combines Hertz contact pressure von Mises yield criterion calculating elastic–plastic distribution sealing interface adopts gas obtained from Murtagian’s experimental ...

After giving a panoramic view of the " textbook " interpretation of the new quantum mechanics, as a sequel to the old quantum theory, the conceptual basis of quantum theory since the Copenhagen Interpretation is reviewed in the context of various proposals since Einstein and Niels Bohr, designed to throw light on possible new facets bearing on its foundations, the key issues to its inherent " i...