social incentives that bring them into existence and sustain them in the course of time. non-governmental organizations (ngos), whether based in the global north or south, are not different. unfortunately, numerous ngos start up and then fail, because the passion of the founder is not supported by a sustainable organization volunteers in all sectors are working with ngos. the ngos are citizen...

We obtain several combinatorial results about chains, cycles and orbits of the elements of the symmetric inverse semigroup ISn and the set Tn of nilpotent elements in ISn. We also get some estimates for the growth of |ISn| and |Tn|, and study random products of elements from ISn.

The contemporary wireless transmitter in addition to information symbols transmits also training order help the receivers estimation of by estimating channel state (CSI). In this paper, we look at existing communication technologies light environment-aware communications, which is a new concept communications that queries time-invariant CSI from local or global database, using about and receive...

legibility is one of the most important characteristics of good urban environments which improves the communication between people and place by helping them to perceive and recognize their environment more deeply and precisely. unfortunately, achieving legibility in today’s urban environments has become very hard due to the increase in incoherent developments and partial renovation projects. mo...