A semiconductor light detector includes a first semiconductor layer of a first conductivity type having a multi-layer structure including a light absorbing layer and an avalanche multiplicating layer, an annular second semiconductor layer formed on the first semiconductor layer, a light detecting region formed by doping an impurity of a second conductivity type in a surface region of the first semiconductor layer, in such a manner that a peripheral portion of the light detecting region is locate...

A three component, self adjustable pillow is provided to support and align a user's head, and shoulders. The pillow comprises a head support base containing a soft fill such as polyester, nylon, chip foam, etc., and shaped as a round or elliptical, solid cylinder. A cloth attachment piece is connected along one of its sides to the pillow by sewing along the pillow length. A circular-shaped, cylindrical neck support is sewn onto the cloth attachment along its remaining free side, and this enables...

A one-step process for the preparation of nitrosamine-free dinitroaniline herbicides which involves contacting the crude dinitroaniline herbicide in the liquid state, after removal of excess amine, with an effective quantity of a hydrobromide salt of a p-amino benzoate ester, optionally in the presence of such an ester, passing a gaseous stream of air therethrough or applying a reduced pressure so as to essentially remove water present, resulting in an essentially nitrosamine-free product.

A single-crystal, monolithic, tandem, photovoltaic solar cell is described which includes (a) an InP substrate having upper and lower surfaces, (b) a first photoactive subcell on the upper surface of the InP substrate, and (c) a second photoactive subcell on the first subcell. The first photoactive subcell is GaInAsP of defined composition. The second subcell is InP. The two subcells are lattice matched. The solar cell can be provided as a two-terminal device or a three-terminal device.

A contoured pillow is provided which is designed to accommodate a person sleeping in the supine position or in a side position. The pillow includes a curved ridge along one edge of the pillow to support the neck. The ridge ends in an elliptical depression within the center of the pillow to support the back of a person's head. The elliptical depression allows a person's head a freedom of movement of 45.degree. from either side of its normal vertical position and allows bending of the neck to a ce...

A three component, self adjustable pillow is provided to support and align a user's head, and shoulders. The pillow comprises a head support base containing a soft fill such as polyester, nylon, foam, chip foam, etc., and shaped as a round or elliptical, solid cylinder. A cloth attachment piece is connected along one of its sides to the pillow by sewing along the pillow length. A circular-shaped, cylindrical neck support is sewn onto the cloth attachment piece along its remaining free side, and ...

In an orthopedic pillow in accordance with the present invention comprises a unitary body of foam or other resilient material with a deep generally hemispherical depression or aperture. The aperture receives the back of a user's head in such a manner that a portion of the weight of the head is supported directly by a mattress or the like beneath the pillow while the rest of the weight of the user's head is supported by the surrounding portion of the pillow. This design allows the user's head to ...

A multi-dimensional pillow comprising a core having a cross sectional thickness gradient along one dimension and at least one geometric piece attached to the core parallel to the direction of the thickness gradient. When the user is in the back-lying position, the geometric piece maintains either the normal lordotic curve of the neck or flexion of the neck and the thickness gradient biases the head in the downslope direction causing a controlled rotation of the head resulting in a traction effec...

An orthopedic pillow in accordance with the present invention comprises a unitary body of feathers, foam or other resilient material with a deep generally hemispherical depression or aperture. The aperture receives the back of a user's head in such a manner that a portion of the weight of the head is supported generally on or substantially close to a mattress or the like beneath the pillow while the rest of the weight of the user's head is supported by the surrounding portion of the pillow. This...

An upright rectangular frame has a roller conveyor in its lower horizontal member, carries hydraulically operated clamps on its upright members, and movably supports a carrier for a tilting circular saw on its upper horizontal member. A panel of plywood and the like can be cut horizontally into two sections while the lower edge of the lower section rests on the roller conveyor and the upper section is clamped to the frame. The lower section may then be shifted horizontally on the roller conveyor...