seals can help to identify the unknown aspects a culture. parthian seals and bullaes not only have played an important role in business in the community, but also they are important to identify the art and culture of this period. except a few reports about parthian site and a few works that can be found in collections and museums little has been written with regard to the seals of this period. ...

Abstract Magnetic fluids are the suspensions composed of magnetic nanoparticles, surfactants, and non-magnetic carrier liquids. widely used in various fields, especially sealing, because their excellent features, including rapid response, flexible flow ability, tunable magneto-viscous effect, reliable self-repairing capability. Here, we provide an in-depth, comprehensive insight into theoretica...

The hydrodynamical properties of the magnetic fluid in magnetic fluid seals are described by a coupled system of nonlinear partial differential equations in a three-dimensional domain with free boundaries. We propose a reduction of the three-dimensional model and describe the resulting two subproblems, the calculation of new boundaries for given flow and magnetic data, and the computation of th...

This paper presents a fluid-filled soft-bodied amoeboid robot inspired by plasmodium of true slime mold. The significant features of this robot are twofold: (1) the robot has fluid circuit (i.e., cylinders and nylon tubes filled with fluid) and truly soft and deformable body stemming from Real-time Tunable Springs (RTSs), the former seals protoplasm to induce global physical interaction between...

The tribological performance of the friction pair between rotor and finger feet is a crucial index affecting service life seals. In recent years, surface texture has attracted considerable number researchers owing to its extraordinary potential in improving antifriction wear resistance. This paper, inspired by snakeskins, introduces three forms (e.g., diamond, ellipse, hexagon) into rotor. effe...

We study fluid flow at the interfaces between elastic solids with randomly rough, self-affine surfaces. We show by numerical simulation that elastic deformation lowers the relative contact area at which contact patches percolate in comparison to traditional approaches to seals. Elastic deformation also suppresses leakage through contacts even far away from the percolation threshold. Reliable es...

Serological analysis was performed to detect Toxoplasma gondii and Neospora caninum infection in seals in Hokkaido. Serum samples were collected from 322 Kuril harbor seals (Phoca vitulina stejnegeri) at Nosappu, Akkeshi and Erimo, from 46 spotted seals (P. largha) at Nosappu, Erimo, Yagishiri Island, Hamamasu and Syakotan, and from 4 ribbon seals (P. fasciata) and a bearded seal (Erignathus ba...

Aerial surveys were conducted in 1999 and 2000 to estimate the densities of ringed (Phoca hispida) and bearded (Erignathus barbatus) seals in the eastern Chukchi Sea. Survey lines were focused mainly on the coastal zone within 37 km of the shoreline, with additional lines flown 148–185 km offshore to assess how densities of seals changed as a function of distance from shore. Satellite-linked ti...