Catalogue of Spacetimes

Spacetimes admitting quasi-conformal curvature tensor

‎The object of the present paper is to study spacetimes admitting‎ ‎quasi-conformal curvature tensor‎. ‎At first we prove that a quasi-conformally flat spacetime is Einstein‎ ‎and hence it is of constant curvature and the energy momentum tensor of such a spacetime satisfying‎ ‎Einstein's field equation with cosmological constant is covariant constant‎. ‎Next‎, ‎we prove that if the perfect flui...

A Catalogue of the Scorpions Occuring in Iran, Up to January 1986

Perho, Irmeli. Catalogue of Persian Manuscripts: Codices Persici, Codices Eyseriani, Codex Persicus Add. Copenhagen: NIAS Press and Det Kongelige Bibliotek, 2017. Hardback, pp. 706. ISBN: 978-87-7694-216-8.

Evaluation of performance quality of SPECT camera in Shariati Hospital of Tehran University of Medical Sciences [Persian]

In nuclear medicine, there are two methods of imaging, planar and tomography. Single photon emission computerized tomography (SPECT) shows better image details and therefore is influenced more by image parameters such as resolution, uniformity, sensitivity, etc. Manufacturers provide customers with data which are obtained by complicated and sometimes secret methods. Marketing companies te...

A Strong Ground Motion Catalogue of Selected Records for Shallow Crustal, Near Field Earthquakes in Iran

Understanding strong ground motions in the near-fault areas is important for seismic risk assessment in densely populated areas. In the past, lack of information on strong ground motion for large and moderate earthquakes led to the use of mainly far field large and moderate earthquake records in equations for calculation of the strong ground motion parameters. In this article, we collected and ...