In the near future low earth orbit (LEO) satellite communication networks will partially substitute for fixed terrestrial multimedia networks especially in sparsely populated areas. Unlike fixed terrestrial networks, ongoing calls may be dropped if satellite channels are shadowed. Therefore, in most LEO satellite communication networks more than one satellite need to be simultaneously visible i...

As one of the key elements in an IPv6 supported DVB-RCS satellite network, the multicast architecture design is facing the challenges of interworking between the IPv6 multicast protocols and the satellite signaling while efficiently using the satellite bandwidth. How to enable the multicast group management functions for satellite end users with and without direct IPv6 MLD router support and ho...

This study presents the “overview of TCP performance on satellite communication networks”, aimed at satellite characteristics, their effects on throughput selected link control protocols and various method proposed for enhancing TCP throughput on satellite networks. Literature reviews on satellite link characteristics and their effects on TCP operation in satellite communication networks. Diffe...

Persian juniper and Pistachio are grown in low density in the rangelands of North-East of Iran. These rangelands are populated by evergreen conifers, which are widespread and present at low-density and sparse shrub of pistachio in Iran, that are not only environmentally but also genetically essential as seed sources for pistachio improvement in orchards. Rangelands offer excellent opportunities...

Advanced technologies in satellite TV broadcasts have led anomalies and opposite behavior of young people against social values. Western countries have targeted different aspects of youth identity through these programs, including, religious, social, cultural and political security. The aim of this study was to evaluate the effect of satellite channels on the value system of students. The aim o...

Adeno-associated satellite virus type 4 interferes with the replication of its helper adenovirus. No interferon-like soluble substance could be detected in satellite-infected cultures and other DNA- and RNA-containing viruses were not inhibited by coinfection with satellite virus under conditions which reduced adenovirus yields by more than 90% in monkey cells. Altering the concentration of ade...

Along with remarkable advancement of radiocommunication services including satellite services, the radio-frequency spectrum and geostationary-satellite orbit are getting congested. WRC-15 was held in November 2015 to study and implement efficient use of those natural resources. There were a number of satellite-related agenda items associated with frequency allocation, new usages of satellite co...

This paper takes a broad view on the history and the present status of satellite communications and broadcasting. The necessary starting point of this overview is the visionary papers produced by Sir Arthur C. Clarke and John Pierce. This was the real dawn of the satellite communication era. This paper attempts to explain the “fil rouge” of the evolution of satellite technologies across six dec...

The simian adeno-satellite virus apparently cannot multiply unless host cells are co-infected with a 'helper' adenovirus. Following simultaneous infection of green monkey kidney cells with simian adenovirus (SV 15) and its satellite, satellite antigen was first detected by immunofluorescence in the nucleus 10 to 12 hr after inoculation, while adenovirus antigen was first detected at 16 hr. A si...

in this paper, we propose a unified and interactive mobile learning (M-Learning) model to help with expanding and spreading education in the Arab Homeland countries. The model utilizes a new competitive spot beam satellite communication technology, which enables efficient channel allocation, where communication channels can be allocated to specific and precise areas. The proposed model is refer...