Xem 1-13 trên 13 kết quả Body boundaries
  • Annals of Mathematics We study the motion of an incompressible perfect liquid body in vacuum. This can be thought of as a model for the motion of the ocean or a star. The free surface moves with the velocity of the liquid and the pressure vanishes on the free surface. This leads to a free boundary problem for Euler’s equations, where the regularity of the boundary enters to highest order. We prove local existence in Sobolev spaces assuming a “physical condition”, related to the fact that the pressure of a fluid has to be positive. ...

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  • This edited collection had its beginnings in conversations with Jan Monk and Janet Momsen who encouraged us to contribute to their series on the geographical aspects of women’s lives. Their support and helpful comments were invaluable during the long process of producing the volume.

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  • Shock wave–boundary-layer interactions(SBLIs) occur when a shock wave and a boundary layer converge and, since both can be found in almost every supersonic flow, these interactions are commonplace. The most obvious way for them to arise is for an externally generated shock wave to impinge onto a surface on which there is a boundary layer.

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  • The impact of an earthquake, flood or war on reproductive health can be devastating. Communities in crisis are suddenly deprived of reproductive health information and services. Access is cut off, yet needs persist, even escalate. A large number of refugees and internally displaced women will be pregnant, facing delivery under dangerous conditions; others may be victims of violence including rape. The United Nations Population Fund (UNFPA) is committed to assisting and protecting women, men and youth made vulnerable by natural disaster, armed conflict, persecution and other causes.

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  • Shock wave–boundary-layer interactions (SBLIs) occur when a shock wave and a boundary layer converge and, since both can be found in almost every supersonic flow, these interactions are commonplace. The most obvious way for them to arise is for an externally generated shock wave to impinge onto a surface on which there is a boundary layer.

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  • When seen from space, “Planet Earth” is a mix of clouds, with the majority (two thirds) of the total surface under ocean water with the remaining third of land forming what we call continents, with various degrees of increasing albedo from open water bodies, vegetation, bare soil, rocks, deserts, and snow/ice packs. In a very short time (relative to Earth's age), the modern human civilization has conquered its neighboring space with probes, satellites, and vehicles carrying humans for exploration.

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  • In this paper we improve an earlier result by Bukhgeim and Uhlmann [1], by showing that in dimension n ≥ 3, the knowledge of the Cauchy data for the Schr¨dinger equation measured on possibly very small subsets of the o boundary determines uniquely the potential. We follow the general strategy of [1] but use a richer set of solutions to the Dirichlet problem. This implies a similar result for the problem of Electrical Impedance Tomography which consists in determining the conductivity of a body by making voltage and current measurements at the boundary. ...

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  • Furthermore, the explanatory scope of TSC sometimes is misunder- stood as stopping short at the boundaries of the physical body, leaving embeddedness out of the account. However, the main unit of the analysis of cognition arguably is the on-going interaction between the embodied agent and the context of action. An adequate description of bodily-based experience should begin in the agent’s relationship to the surroundings, because experience arises from the interaction between agent and context.

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  • The seat or seal rings provide the seating surface for the disk. In some designs, the body is machined to serve as the seating surface and seal rings are not used. In other designs, forged seal rings are threaded or welded to the body to provide the seating surface. To improve the wear-resistance of the seal rings, the surface is often hard-faced by welding and then machining the contact surface of the seal ring. A fine surface finish of the seating area is necessary for good sealing when the valve is closed.

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  • In the design of an integrated circuit, the designer is faced with the challenge of having circuits and systems function over multiple operating points. From the point of view of performance, the circuit must meet its speed requirements over a range of voltages and temperatures that reflect the environment that the circuit is operating in. Also while the performance requirement must be met at a set of worst-case conditions for speed, the power requirement must be simultaneously met at another set of worstcase conditions for power....

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  • Though he was already dead, Frank Norris had a good year in 1909. His epic novel Th e Octop u s (1901) was brou gh t to th e screen by vision ary film artist D. W. Griffith—no other filmmaker has touched it since. Titled “A Corner in Wheat,” the film is a confident, bare-bones distillation of the novel’s hundreds of pages into fewer than fifteen minutes of viewing time. It is of course no substitute for the original, a point compounded by the fact that Griffith drew on a second Norris novel, The Pit (1903), also a rather long book....

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  • Candid Street Portraiture: Working in the face of strangers, street portraiture pushes the boundaries of personal spaces and, for that matter, the photographer’s own comfort zone. It's all about candid shooting, getting in close to the subject with the subject unaware of the camera. The portrait can be just the face or whole body & all in between. Framing & composition are important but in a relaxed way. The best of these portraits capture emotions as the story of the subject unfolds before you....

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  • The cover for the opening in the valve body is the bonnet. In some designs, the body itself is split into two sections that bolt together. Like valve bodies, bonnets vary in design. Some bonnets function simply as valve covers, while others support valve internals and accessories such as the stem, disk, and actuator. The bonnet is the second principal pressure boundary of a valve. It is cast or forged of the same material as the body and is connected to the body by a threaded, bolted, or welded joint.

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