the study of seals and seal impressions can make clear the dark corners of the social history of the seleucid and parthian. on the other hand, the analysis of personal and social position of individuals or groups for understanding the complicated relationship between human with other people or groups, also for the understanding of interactional relationships has gained special attention in hist...

It is necessary to obtain a fundamental understanding of the goaf gas flow patterns in longwall mine in order to develop optimum goaf gas drainage and spontaneous combustion (sponcom) management strategies. The best ventilation layout for a longwall underground mine should assist in goaf gas drainage and further reduce the risk of sponcom in the goaf. Further, in the longwall panel, regulators ...

Tidal energy has received considerable attention over the past decade due to its predictability and high power density. The research in tidal turbine area concentrated primarily on improvement of conversion efficiency. In contrast, testing turbine’s mechanical components less attention. particular, reliable operation rotary seals is crucial prevent water ingress into electrical components. This...

Reciprocating compressors of the crosshead design have sealing elements around the piston and piston rod. These seals can be of lubricated or nonlubricated design. This paper will give details about our R&D-work for dry running piston rod sealings or packings for high pressure applications. Starting with an overview of packing design some details are given about tribological tests. Measurements...

this paper focuses on studying, introducing and comparing seals from the settlement areas and cemeteries in the north of central plateau of iran. these seals were discovered in the previous and present excavations and surveys over the region. based on the obtained results, the ratio of similarity and difference between the two groups of seals (from the settlement areas and the cemeteries) is qu...

a polynomial   1 2 ( , , , ) n f x x x is called multilinear if it is homogeneous and linear in every one of its variables. in the present paper our objective is to prove the following result: let   r be a prime k-algebra over a commutative ring   k with unity and let 1 2 ( , , , ) n f x x x be a multilinear polynomial over k. suppose that   d is a nonzero derivation on r such that ...

Since the Sassanid era, many reliefs and seals have left and by reviewing their designs, the mythical and religious attitudes of those people can be understood. The purpose of this article is to decode and interpret the symbolic paintings and to review and study the myths, concepts, and religious rituals of this period. The question is that what the divine and human origin of the symbolic paint...

The eastern staircase of Apadana – the Royal Achaemenid Audience Hall at Persepolis was decorated with numerous reliefs depicting various people subjected to king’s rule, paying homage and bringing gifts. Among these, Lydian group is one delegations carved in lower part staircase. This led by officers court. participants carried amphorae, bowls armlets were also horses a chariot. amphorae arm r...