In previous work [1], our group implemented a tilted-mirror interferometric sensor that can measure rotation of a hybrid rotary-linear axis as part of a 5-DOF machine tool intended for fabricating centimeter-scale parts. Attached to the shaft of the hybrid axis is a tilted mirror rotary sensor, which uses two laser interferometers to measure the orientation of a tilted 3-inch diameter mirror at...

Polycrystalline aluminum nitride (AlN) layers were deposited by pulsed-dc reactive magnetron sputtering from a variable deposition angle a1⁄4 0 –84 in 5 mTorr pure N2 at room temperature. Xray diffraction pole figure analyses show that layers deposited from a normal angle (a1⁄4 0 ) exhibit fiber texture, with a random in-plane grain orientation and the c-axis tilted by 42 6 2 off the substrate ...

Plant root systems must grow in a manner that is dictated by endogenous genetic pathways, yet sensitive to environmental input. This allows them to provide the plant with water and nutrients while navigating a heterogeneous soil environment filled with obstacles, toxins, and pests. Gravity and touch, which constitute important cues for roots growing in soil, have been shown to modulate root arc...

Symmetrical four-sided 12-mm-high pyramids with 301-tilted sides were revealed by the etching of semi-insulating (1 0 0) GaAs substrates in 1H3PO4: H2O2:8H2O at 25 1C via sacrificial /0 0 1S-oriented Ti/GaAs/AlAs (100/2000/100 nm) etching mask patterns. The pyramids, MOCVD overgrown with InGaP/AlGaAs/GaAs heterostructure pyramids, were used as the base for magnetic field vector sensors. Each se...

The dynamical interaction between eddies and shear flow is investigated through a simplified model of vorticity conservation with tilted eddies. Energy is transfered either to the flow or to eddies, depending on the eddy tilt with respect to the flow shear. When eddies are tilted in the shear direction, the system is favorable to shear increase: tilt instability or negative viscosity phenomenon...

The molecular and dissociative adsorption of methane-thiol (CH(3)SH) in the high-coverage limit on the (111) surfaces of the Ni-group metals has been investigated using ab initio density functional techniques. In molecular form, methane-thiol is bound to the surface only by weak polarization-induced forces in a slightly asymmetric configuration with the C-S axis tilted by 35-60° relative to the...

An electrically pumped random laser diode was fabricated with a MgZnO/ZnO/MgZnO double heterostructure embedded in a ZnO pn junction. Gain can be achieved at very low-threshold current owing to exciton processes. Light closed loops are formed by random multiple scattering on vertical column boundaries in the thin film. The tilted and rough mesa edge planes serve as refraction mirrors, giving ri...

We present density functional theory calculations of methanol and methoxy adsorption at the Cr-terminated α-Cr2O3(0001) surface. We report on the equilibrium geometries of the adsorbed methanol and methoxy molecules, analyse the bonding to the surface, and discuss the dissociation energetics of methanol into methoxy on the surface. We found that methanol adsorbs with its O atom situated above a...

Cadmium stearate surfactant molecules assembled into monolayers by the Langmuir-Blodgett method exhibit bond-orientational order. Bond-orientational correlations extend over macroscopic distances on the order of a millimeter while translational correlations decay on a scale of tens of angstroms. The long axis of the molecules are tilted away from the surface normal but the tilt direction is dis...

PURPOSE To determine the configuration of the anterior lamina cribrosa (LC) surface in eyes with different tilt axes. METHODS A total of 114 eyes (66 glaucomatous eyes and 48 healthy eyes) with tilted optic discs (ovality index > 1.3) were divided into vertical- and horizontal-tilt groups according to their optic disc tilt axis. Serial horizontal B-scan images of the ONH were obtained from ea...