HRL Laboratories , was the research arm of Hughes Aircraft. It is a dedicated research center, established in 1960, in Malibu. Currently owned by General Motors Corporation and Boeing, the research facility is housed in two large, white multi-story buildings overlooking the Pacific Ocean. Wikipedia.
Ladd T.D.,HRL Laboratories
Physical Review B - Condensed Matter and Materials Physics | Year: 2012
We analyze the effects of hyperfine interactions on coherent control experiments in triple quantum dots. By exploiting Hamiltonian symmetries and the SU(3) structure of the triple-dot system under pseudoexchange and longitudinal hyperfine couplings, we provide analytic formulas for the hyperfine decay of triple-dot Rabi and dephasing experiments. © 2012 American Physical Society.
Gregoire D.J.,HRL Laboratories
IEEE Antennas and Wireless Propagation Letters | Year: 2013
This letter presents a method for mapping and fabricating metasurfaces on arbitrary 3-D surfaces. Metasurfaces are used for holographic leaky-wave antennas, reflectarray antennas, coatings for soft horn antennas, artificial magnetic conductors, high-impedance surfaces, frequency selective surfaces, electromagnetic band-gap structures, and surface-wave waveguides. They are typically fabricated as 2-D planar structures by printing a grid of metallic patches on a dielectric substrate, but for some applications, it is desirable to create a metasurface conformal to a 3-D surface. The methods presented here can be used with direct-write printing or with standard printed circuit board (PCB) techniques. The PCB method involves mapping the metasurface to a set of 2-D bands that are laminated to a 3-D substrate. As an example, a 3-D conformal, ellipsoidal, holographic, leaky-wave antenna was designed, fabricated, and measured. © 2002-2011 IEEE.
Roper C.S.,HRL Laboratories
International Journal of Heat and Fluid Flow | Year: 2011
A micro-architected multifunctional structure, a sandwich panel heat pipe with a micro-scale truss core and arterial wick, is modeled and optimized. To characterize multiple functionalities, objective equations are formulated for density, compressive modulus, compressive strength, and maximum heat flux. Multiobjective optimization is used to determine the Pareto-optimal design surfaces, which consist of hundreds of individually optimized designs. The Pareto-optimal surfaces for different working fluids (water, ethanol, and perfluoro(methylcyclohexane)) as well as different micro-scale truss core materials (metal, ceramic, and polymer) are determined and compared. Examination of the Pareto fronts allows comparison of the trade-offs between density, compressive stiffness, compressive strength, and maximum heat flux in the design of multifunctional sandwich panel heat pipes with micro-scale truss cores. Heat fluxes up to 3.0MW/m2 are predicted for silicon carbide truss core heat pipes with water as the working fluid. © 2010 Elsevier Inc.
HRL Laboratories | Date: 2015-06-04
A sandwich material having both structural strength and significant acoustic attenuation. In one embodiment, a sandwich is composed of an architected core secured between two facesheets, with a compliant layer forming the connection between the core and the facesheets. The compliant core has a low modulus, resulting in a low speed for elastic shear waves in the sandwich, at low static loads. At high static loads the compliant material stiffens and allows the sandwich to exhibit significant structural strength.
HRL Laboratories | Date: 2015-08-13
A composition for forming a microlattice structure includes a photopolymerizable compound and a flame retardant material. A microlattice structure includes a plurality of struts interconnected at a plurality of nodes, the struts including: a copolymer including a reaction product of a photopolymerizable compound and a flame retardant material. A microlattice structure includes a plurality of struts interconnected at a plurality of nodes, the struts including: a polymer including a reaction product of a photopolymerizable compound; and a flame retardant material.