A quantization over a manifold can be seen as a way to construct a differential operator with prescribed principal symbol. The map from the space of principal symbols to the space of differential operators is moreover required to be a linear bijection. It is known that there is in general no natural quantization procedure. However, considering manifolds endowed with additional structures, such ...

introduction: natural disasters may strike a community at any time, causing death, injuries and material destruction. knowledge of the epidemiology of disaster impacts is essential to determine effective responses. iran is one of the most aired regions of the world, and suffers frequent natural disasters during the last decade were reported four major earthquake, one flood and the worst drought...

Average precision (AP) is one of the most widely used metrics in information retrieval and natural language processing research. It is usually thought that the expected AP of a system that ranks documents randomly is equal to the proportion of relevant documents in the collection. This paper shows that this value is only approximate, and provides a procedure for efficiently computing the exact ...

today, nuclear medicine has rapidly been developed so that in some cases, plays a unique role in diagnosis but unfortunalty in spite of diagnostic and therapeutic advantages, the term “nuclear” can induce worries in patients and society. in this article, base on new documents, we intend to show that this worries has no scientific basis. to produce a realistic view, regarding to radiation protec...

as one of the most unfathomable mysteries human beings encounter with, death has always been one of the main concerns of great scholars and one of the major teachings of monotheistic religions. augustine is one of the great scholars who reflect upon and talk about death. interestingly, we do not face with a particular definition of death in augustine’s works. as a platonic philosopher, he consi...