I had come to see the gray seals (Halichoerus grypus; Figure 1) that live along coast of Pembrokeshire in far west Wales, and was not disappointed. A wild, windblown seascape with steep cliffs, small islands, coves inaccessible by land, it is home dolphins, porpoises, an extensive cast seabirds, some 5000 seals. Tiny stone cottages belonged people who made a living long ago taking rowboats onto...

One primary objective of endodontic therapy is to establish an adequate seal with the root canal filling material. The placement of an immediate amalgam buildup at obturation, in conjunction with rubber dam isolation, allows an endodontic seal to be extended from the foramen to the cavosurface margin. As a result of this immediate buildup, the length of the seal and the longevity of the endodon...

A combination of image processing and matching techniques is proposed to solve the problem of seal identification. The techniques include thresholding, rotation, thinning, reexpansion, and finally matching of seal images. The principle for identification is based on the fact that the spatial distributions of the stroke skeletons of the characters engraved by human hands on two distinct seals wi...

This paper presents three dimensional study of a ferrofluid seal, its centering effect and its static capacity. Thus, a method based on a potential energy criterion has been put forward to study the seal shape. But such a use of ferrofluid seals is interesting only if the magnetic field created by the permanent magnets saturates totally the ferrofluid. Two cylindrical structures consisting of t...

19 The biological basis of endodontics is well established and underlines the dominant role of bacteria in the initiation, development and persistence of periapical disease (Kakehashi S et al, 1965) or apical periodontitis (AP) according to the terminology currently in use. The aim of clinical procedures is to prevent or eliminate bacterial infection from the root canal system (Orstavik D, Pitt...

Based on analyzing syntax structrure and semantics reduction system of Seal calculus and Mobile Ambient calculus, we investigate three equivalence relations of the two calculus : communication’s equivalence, communication primitives’s equivalence and code movement equivalence. Then we show the structural transformation technology from Seal to Mobile Ambient. Our work proposes a systemitical met...

OBJECTIVE The purpose of this study was to evaluate the release of formaldehyde by some root canal filling materials. STUDY DESIGN Two older endodontic sealers, AH 26 and Endomethasone, and 2 recently available sealers, AH Plus and Top Seal, were analyzed. Infrared and electronic spectroscopy were used to determine formaldehyde content after set of the materials. RESULTS Analysis showed tha...

Harbour seals can use their vibrissal system to detect and follow hydrodynamic trails left by moving objects. In this study we determined the maximum time after which a harbour seal could indicate the moving direction of an artificial fish tail and analysed the hydrodynamic parameters allowing the discrimination. Hydrodynamic trails were generated using a fin-like paddle moving from left to rig...

–This paper deals with a small mobile device, "Seal Mechanism," with three degrees of freedom (DOFs). An L-shaped structure of Seal Mechanism is proposed. This device consists of two controlled Electromagnets FA and FB connected by two Piezoelectric actuators EA and EB with Electromagnet FC that generates a constant friction. The friction at FA and FB are alternated by an on-off control. The wh...

The Paro seal robot resembles a baby harp seal, and has been designed as a therapeutic robot for use with older people, particularly those with dementia. Its behaviours encourage nurturing behaviour: it has an appealing face, cries out like a seal, and responds to stroking (or hitting). In this paper, claims about the positive effects that the seal robot has on the health and well being of thos...