H. Akbar-Zadeh has recently proposed (J Geom Phys 17 (1995) 342) a new geometric formulation of Einstein–Maxwell system with source in terms of what are called “Generalized Einstein manifolds”. We show that, contrary to the claim, Maxwell equations have not been derived in this formulation and that, the assumed equations can be identified only as sourcefree Maxwell equations in the proposed geo...

Penggunaan masker di masa pandemi Covid-19 ini menjadi hal yang sangat penting untuk memproteksi diri dan juga orang lain dari risiko penularan virus ini. Sebagaimana dikatahui bahwa sebagian besar adalah melalui droplets, maka dirasakan perlu melindungi dengan penggunaan masker. Mengingat masih banyaknya anak-anak panti asuhan Al –Akbar tidak menggunakan saat dipanti ataupun berada diluar pant...

The dataset presented here is related to the research article entitled "Highly Efficient Electro-optically Tunable Smart-supercapacitors Using an Oxygen-excess Nanograin Tungsten Oxide Thin Film" (Akbar et al., 2017) [9] where we have presented a nanograin WO3 film as a bifunctional electrode for smart supercapacitor devices. In this article we provide additional information concerning nanograi...

in this paper, the matsumoto metric with special ricci tensor has been investigated. it is proved that, if  is ofpositive (negative) sectional curvature and f is of  -parallel ricci curvature with constant killing 1-form ,then (m,f) is a riemannian einstein space. in fact, we generalize the riemannian result established by akbar-zadeh.

1. Department of Biological Sciences, Kharazmi University, Tehran, Iran. 2. Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran, Iran. 3. MSc student in Developmental Biology Sciences, Kharazmi University, Tehran, Iran. 4. BSc in Biology, Reproductive Biomedicine Research Center, Royan Institute fo...

The Byzantine Emperor Theophilus (829-842 AD) died from dysentery, the exact nature of which is unknown. However, based on the original Greek texts of the Byzantine historians and chroniclers of that era, the possible cause of death may be connected to Theophilus' pagophagia (snow eating), in order to relieve the symptoms of gastric inflammation. Additionally to the symptoms from the gastro-int...

N E W O R L E A N S — The best predictors of in-hospital deterioration of patients diagnosed with acute pulmonary embolism in the emergency department are a shock index greater than 1 and a pulmonary embolism severity index score more than 100, according to data from the EMPEROR registry. The clinical implications: Calculate the pulmonary embolism severity index (PESI) and shock index routinely...