In this paper, we study projection systems with a single effective viewpoint, including combinations of mirrors and lenses (catadioptric) as well as just lenses with or without radial distortion (dioptric systems). First, we extend a well-known unifying model for central catadioptric systems to incorporate a class of dioptric systems with radial distortion. Second, we provide a new representati...

The title compound, C(20)H(14)Br(2)N(2)O(2), is a dibasic tetra-dentate Schiff base and reveals intra-molecular O-H⋯N hydrogen bonds between the hy-droxy O atoms and the imino N atoms. The dihedral angle between the central and terminal benzene rings is 39.7 (1)°. In the crystal, the compound is disposed about a crystallographic mirror plane parallel to the ac plane passing through the two cent...

We obtain the coefficients of a new fundamental plane for supermassive black holes at the centers of elliptical galaxies, involving measured central black hole mass and photometric parameters which define the light distribution. The galaxies are tightly distributed around this mass fundamental plane, with improvement in the rms residual over those obtained from the MBH − σ and MBH − L relations...

Ultrasound guided central venous cannulation is rapidly becoming the standard technique for achieving a central line in neonates, infants and children. Older techniques such as surgical cutdown and 'blind' percutaneous venipuncture have many disadvantages: they are time consuming, vein consuming and/or associated with dangerous immediate or late complications. On the other hand, ultrasound has ...

The structure of the title thio-urea derivative, C(14)H(16)N(4)O(5)S, features an almost planar central C(2)N(2)OS fragment (r.m.s. deviation = 0.005 Å), an arrangement stabilized by an intra-molecular N-H⋯O hydrogen bond. The terminal rings are twisted out of this plane, the dihedral angle formed with the benzene ring being 33.22 (10)°. The cyclo-hexyl ring is disordered, with two orientations...

Delamination is one of the most common failure modes in composite structures. In the case of in-plane compressional loading, delamination of a layered flat structure can cause a local buckling in delaminated area which subsequently affects the overall stiffness of the initial structure. This leads to an early failure of the overall structure. Moreover, with an increase in load, the delaminated ...

A detailed understanding on rock failure modes testifies the competence of support designs for engineering work. Studying such using physical models specimens under laboratory conditions can be time efficient, informative and economically viable. In this study, mechanical behavior massive metabasalts were characterized with reference to through index tests as point load Brazilian tests. Rock te...

Quality of service (QoS) provisioning for dynamically composable software elements in a programmable router has not received much attention. We present a router platform that supports extensible and configurable routing elements, and provides them with access to given resource allocations. Scheduling issues for these elements are discussed: (1) flow-based scheduling, (2) the preemptibility of a...