Optical data processing using paraboloidal mirror segments

An optical data processing system using paraboloidal reflecting surfaces is disclosed. In the preferred embodiment the paraboloidal reflecting surfaces are segments of a paraboloidal mirror. A source of coherent light is in the focal plane of the first paraboloidal mirror segment which collimates the beam and reflects it toward a second paraboloidal mirror surface. The information to be analyzed, on a transparency for example, is placed in the collimated beam. The beam is reflected from the second paraboloidal mirror segment and focused on a Fourier transform plane. A photon detector could be placed in the Fourier transform plane or suitable spatial filters, with the filtered beam then being reflected from a third paraboloidal mirror segment to be focused on a reconstruction plane

Massive unilateral chylous pleural effusion: a rare initial presentation of Behcet\u27s disease.

Pulmonary manifestations of Behcet\u27s disease are not very common and usually include pulmonary artery aneurysms, central venous thrombosis, pneumonia and pleurisy. Chylothorax secondary to superior vena caval obstruction is a rare complication and has been reported in only a few cases. We report a case of a 24-year-old man presenting with massive chylothorax as the initial presentation of Behcet\u27s disease that was successfully treated conservatively

Elliptic jets, part 2. Dynamics of coherent structures: Pairing

The dynamics of the jet column mode of vortex pairing in the near field of an elliptic jet was investigated. Hot-wire measurements and flow visualization were used to examine the details of the pairing mechanism of nonplanar vortical elliptic structures and its effect on such turbulence measures as coherent velocities, incoherent turbulence intensities, incoherent and coherent Reynolds, stresses, turbulence production, and mass entrainment. It was found that pairing of elliptic vortices in the jet column does not occur uniformly around the entire perimeter, unlike in a circular jet. Merger occurs only in the initial major-axis plane. In the initial minor-axis plane, the trailing vortex rushes through the leading vortex without pairing and then breaks down violently, producing considerably greater entrainment and mixing than in circular or plane jets

A People-state Negotiation in a Borderland a Case Study of the Indonesia–Malaysia Frontier in Sebatik Island

This paper aims to show the dynamics of the Indonesian – Malaysian border area in Sebatik Island, East Kalimantan, Indonesia. Take into account as a background is the territorial dispute between Indonesia and Malaysia over the Ligitan and Sipadan Islands which were awarded to Malaysia by the decision of the ICJ (International Court of Justice) in 2002, which was followed by the dispute over the Ambalat sea block in 2005. Sebatik Island is geographically very strategic since it faces the disputed areas. Therefore the concerns of the Indonesian state with regard to the island pertain to issues of nation-state sovereignty and territorial security, which she tries to safeguard through intensive campaigns. Research conducted in Sebatik in 2009 showed how people willingly reinforced the state by incorporating its programs, despite their ambiguous position as people in a border area, which support they used subsequently in negotiating with the state for their own local purpose

Black hole solutions in 2+1 dimensions

We give circularly symmetric solutions for null fluid collapse in 2+1-dimensional Einstein gravity with a cosmological constant. The fluid pressure $P$ and energy density $\rho$ are related by $P=k\rho$ $(k\le 1)$. The long time limit of the solutions are black holes whose horizon structures depend on the value of $k$. The $k=1$ solution is the Banados-Teitelboim-Zanelli black hole metric in the long time static limit, while the $k<1$ solutions give other, `hairy' black hole metrics in this limit.Comment: 8 pages, RevTeX (to appear in Phys. Rev. D) References to Mann and Ross, and Mann, Chan and Chan adde