An optoelectronic recirculating sorter based on CMOS/vertical cavity surface emitting laser smart pixel arrays; architecture and system demonstration

The architecture of an optoelectronic recirculating sorter based on the hybrid integration of CMOS logic circuitry, silicon detector/receivers and vertical cavity surface emitting lasers is presented along with the demonstration of the system.     

Determination of the distribution of straight-chain segment lengths in crystalline polyethylene from the Raman LAM-1 band

It is shown how the shape of the longitudinal acoustic vibration observed in the low-frequency region of the Raman spectra of crystalline polymers can be used to obtain a quantitative distribution of lengths of straight-chain segments associated with polymer lamellas. The procedure is demonstrated for a “solid-state” extrudate of polyethylene and for a bulk-crystallized specimen of the same polymer. Equations relating the shape of the LAM-1 band to the shape of the distribution curve are given. The low intensity observed for the LAM-3 mode relative to LAM-1 is explained quantitatively without recourse to end effects. LAM-5 has been observed for bulk-crystallized polyethylene. For the extrudate we find the distribution of lengths of straight-chain segments to have a tail on the long-length side which is not present for the bulk-crystallized sample. The Raman technique is shown to provide new morphological data unattainable at present by other methods.     

Scaled single-zeta basis set for use with a silicon effective potential: Generalized valence bond description of disilane

A compact and efficient scaled single-zeta basis set has been developed for use in conjunction with the coreless Hartree–Fock silicon effective potential. The scale factors were determined by minimizing the electronic energy of the disilane molecule. Based upon a generalized valence bond computation using this basis, we conclude that the classical concept of localized σ bonds is adequate to fully explain the electronic structure of disilane in analogy to the ethane molecule.     

A Note on Fixed and Minimum Order Quantity Stock Systems

It is often believed that the square root formula called the EOQ only applies to situations where customers demand small quantities at a fairly constant rate. This note shows that essentially the same formula can be derived for "lumpy" customer orders occurring at a variable rate. Also, as the EOQ is derived assuming that a fixed quantity is always ordered for replenishment it does not allow for the over-shoot when customer orders exceed the available stock. This note shows that when the EOQ is large relative to the average customer order the overshoot problem can be ignored. However, when the EOQ is small some tentative results involving exponentially distributed customer order quantities indicate that substantial savings can be made using a "minimum order quantity" policy.