We present an innovative method to address the relation between the purity of type-I polarization entangled states and the spatial properties of the pump laser beam. Our all-optical apparatus is based on a spatial light modulator, and it offers unprecedented control on the spatial phase function of the entangled states. In this way, we demonstrate quantitatively the relation between the purity ...

Acceleration of electrons to relativistic energies by a multidimensional self-modulated laser wakeeeld is discussed. Above a power threshold, a relativis-tically self-guided channel, from an intense ultrashort laser pulse (I 410 18 W/cm 2 , = 1 m, = 400 fs), was found to increase the laser propagation distance, decrease the electron beam divergence, and increase the energy of the electrons. The...

The 1.25 A, 40 ns electron beam is accelerated in the 200 MeV electron linac. This beam is then focused onto a 3 rom diameter spot at the 7 rom thick (i. e., two radiation length) tungsten target. By the process of multiple nuclear-scattering the target generates the positron particles. These positrons, in general, can have a large diverging angle. The empirical formula for an angular dependenc...

Theoretical approaches based on bridged-crack models and plate/beam theory have proved to be effective in the modeling of Mode I and Mode II delaminations in composite laminates reinforced through the thickness. This paper deals with some aspects of the modeling of Mixed Mode delaminations. Two typical mixed mode problems are considered: the curved beam in bending (C specimen) and the Mixed-Mod...

A system of instruments used to monitor the high-power SLAC photon beam is described. Operational experience in a series of photoproduction experiments shows an overall accuracy of f 1% with beam powers from 100 watts to 3.5 kW at bremsstrahlung end point energies from 5 to 18 GeV. (Submitted to Nucl. Instr. and Methods.) Work supported by the U. S. Atomic Energy Commission. I‘ On Icave from th...

in this paper, the stability of a functionally graded magneto-electro-elastic (fg-mee) micro-beam under actuation of electrostatic pressure is studied. for this purpose euler-bernoulli beam theory and constitutive relations for magneto-electro-elastic (mee) materials have been used. we have supposed that material properties vary exponentially along the thickness direction of the micro-beam. gov...

Synthetic materials for bone replacement must ensure a sufficient mechanical stability and an adequate cell proliferation within the structures. Hereby, titanium materials are suitable for producing patient-individual porous bone scaffolds by using generative techniques. In this in vitro study, the viability of human osteoblasts was investigated in porous 3D Ti6Al4V scaffolds, which were produc...

A mixed—mode delamination test procedure was developed combining double cantilever beam (DCB) mode I loading and end-notch fixture (ENF) mode II loading on a split unidirectional laminate. By loading with a lever, a single applied load simultaneously produces mode I and mode II bending loads on the specimen. This mixed-mode bending (MMB) test was analyzed using both finite-element procedures an...

The acoustic fields of a high intensity focused ultrasound (HIFU) transducer operating either at its fundamental (1.1 MHz) or third harmonic (3.3 MHz) frequency were measured by a fiber optic probe hydrophone (FOPH). At 1.1 MHz when the electric power applied to the transducer was increased from 1.6 to 125 W, the peak positive/negative pressures at the focus were measured to be p(+) = 1.7-23.3 ...

After a decade of design and construction, South Africa's SKA-MID precursor MeerKAT has begun its science operations. To make full use the widefield capability array, it is imperative that we have an accurate model primary beam antennas. We taken available L-band full-polarization 'astro-holographic' observations three antennas generic electromagnetic simulation created sparse representations b...