Abstract: Disclosed are platinum(IV) chelates derived from substituted amides. The chelates result from the reaction under mild conditions of potassium chloroplatinate(II) and the appropriate amide. The chelate trans-dichloro-cis-bis(dimethylacetamide-C,O) was prepared, fully characterized and exemplified in preparation of the antihistamine diphenhydramine hydrochloride.
Abstract: Method and apparatus for frequency domain modulation optical fiber communication particularly useful for digital and analog signal transmission comprising, in the order recited, a plurality of parallel-connected signal input units each incorporating individual laser sources provided with means modulating the output radiations of said laser sources responsive to individual signal inputs, thereby establishing, for each signal input, an individual optical information wave train, a collimating lens, an acousto-optical modulator means introducing a sub-carrier signal developing a beat frequency with said optical information wave train, an optical fiber coupler transmitting the resulting signal through an optical fiber to a common square law detector and an information receiver isolating a preselected individual signal input according to its associated individual sub-carrier frequency, said individual sub-carrier frequencies being spaced one from another by a frequency interval forestalling interference in the rece
Abstract: The invention relates to chemically bonded laminated structures and their production from oriented polymeric laminae. The bonds between the contacting lamina are formed by chemical reaction across their interface involving constituent molecular chains of each laminae. Three methods have been found for producing the bonds: (a) bringing the surfaces of the lamina in intimate contact to within 10.degree. C. and 100.degree. C. below the melting temperature of the surfaces; (b) interposing a coupling agent for the polymer molecules of the intimately contacting surfaces of each member into their interface and heating the laminate to a temperature effective to cause reaction of the coupling agent with the molecules of each; and (c) interposing a catalyst to promote chemical reaction of the molecules of each laminae with the molecules of intimately contacting lamina into their interface and heating to a temperature effective to cause reaction.
Abstract: Thin film photovoltaic solar cells are made by forming the cell structure from a number of layers including the contact layers and semiconductor layers. At least one of the semiconductor layers is a tellurium containing II-VI compound. After the structure is formed, it is heated to temperatures above 300.degree. C. and then rapidly cooled at rates greater than 10.degree. C./s. Cells comprising CdS and CdTe have increased fill factor when the fabrication process includes heating and rapid cooling.
Type:
Grant
Filed:
April 15, 1985
Date of Patent:
December 1, 1987
Assignee:
The University of Delaware
Inventors:
Brian E. McCandless, Robert W. Birkmire
Abstract: A vibrating tube densimeter characterized by separate electrical conductors attached to and moving with the tube. By interaction with a constant magnetic field in which they move, and in cooperation with an electronic circuit outside the invention, one of the conductors vibrates the tube and the other senses the vibration. The novel design is simple and permits operation at high temperatures.
Abstract: A photochemical vapor deposition apparatus includes a reactor housing having a window in one wall above a reaction chamber in the housing. A transparent curtain divides the reaction chamber into a reaction zone and a flush zone. At least one substrate is mounted in the reaction zone in light communication with the window so that ultraviolet radiation may penetrate through the window into the reaction zone. The window is kept clear by a gas flowing through the flush zone.
Abstract: Thin film photovoltaic cells having a pair of semiconductor layers between an opaque and a transparent electrical contact are manufactured in a method which includes the step of scanning one of the semiconductor layers to determine the location of any possible shorting defect. Upon the detection of such defect, the defect is eliminated to increase the durability and yield of the photovoltaic device.
Abstract: A process is disclosed for preparing novel arrays of metal coordination compounds characterized by arrangement of the metal ions, separated by a linking agent, in stacked order one above the other. The process permits great flexibility in the design of the array. For example, layers of different composition can be added to the array at will.
Abstract: A mutant of Bacillus subtilis has been isolated which greatly facilitates gene cloning in this nonpathogenic microorganism. B. subtilis is a known protein secretor and can be used efficiently in commercial operations. Unlike the more commonly used clone-propagating organism E. coli., B. subtilis has the advantage of lacking pyrogenic substances in its cell envelope. However, chimeric plasmids for infection of B. subtilis have been difficult to prepare, and if E. Coli is used as an intermediate host to provide plasmid forms suitable for Bacillus transformation, the B. subtilis treats any E. coli-propagated DNA as foreign and preferentially attacks the insert portion of the plasmid. This attach results in loss of cloned genes and limits the use of B. subtilis as a cloning system. The B. subtilis recipient strain of this invention is, on the other hand, stably and efficiently transformed by E. coli-propagated plasmid DNA at high frequency.
Abstract: Method and apparatus for frequency domain modulation optical fiber communication particularly useful for digital and analog signal transmission comprising, in the order recited, a plurality of parallel-connected signal input units each incorporating individual laser sources provided with means modulating the output radiations of said laser sources responsive to individual signal inputs, thereby establishing, for each signal input, an individual optical information wave train, a collimating lens, an acousto-optical modulator means introducing a sub-carrier signal developing a beat frequency with said optical information wave train, an optical fiber coupler transmitting the resulting signal through an optical fiber to a common square law detector and an information receiver isolating a preselected individual signal input according to its associated individual sub-carrier frequency, said individual sub-carrier frequencies being spaced one from another by an interval forestalling interference in the reception of
Abstract: The present invention relates to laminates of polyolefin laminae and strips chemically bonded in the solid state by reactions initiated by cross-linking catalysts interspersed at the interface of contacting laminae. Catalysts to initiate crosslinking reactions at temperatures below the melting point of the respective laminae are employed. A preferred application of the laminate is a chemically bonded structure of highly oriented, preferably uniaxially oriented film with the direction of orientation of uniaxial orientation at an angle to each other in successive laminae.
Type:
Grant
Filed:
November 18, 1983
Date of Patent:
March 11, 1986
Assignee:
University of Delaware
Inventors:
Stoyko C. Fakirov, I-Hwa Lee, Jerold M. Schultz
Abstract: Fibers and plastic materials reinforced with these fibers which have a diameter that varies along the fiber axis are provided. The fibers increase the strength of the material by reducing fiber pull out from the plastic matrix. The variation in diameter results in an undulating surface on the fiber which locks it into the matrix.
Abstract: A process for preparing dry, free-flowing chitosan-carboxylic acid complexes is taught wherein chitosan, containing free amino groups is dispersed in selected liquids and contacted with selected carboxylic acids. The complexes are recovered by filtration, decantation or centrifugation.
Abstract: A thin film photovoltaic solar cell having an opaque electrical contact which consists of a low-cost substrate, such as a metal alloy or a metallurgical grade crystalline silicon and a barrier layer which is optically reflective, a first semiconductor layer, a second semiconductor layer, a transparent electrical contact and an encapsulant.
Abstract: There is taught a class of homogeneous oxidation catalysts characterized by the presence therein of two chelated cations of Cu(I) in each molecule.
Abstract: Passivated gallium arsenide solar photovoltaic cells with high resistance to moisture and oxygen are provided by means of a gallium arsenide phosphide window graded through its thickness from arsenic rich to phosphorus rich.
Abstract: An improved photovoltaic cell, and method for its manufacture, comprising front and back electrically conductive layers between which is sandwiched a primary light-absorbing layer of amorphous semiconducting material displaying low photogenerated carrier mobility below about 50 cm.sup.2 /V second, the constitution of which primary layer is fabricated to provide an affinity gradient reducing back-diffusion of a preselected species of photogenerated carrier (electrons or holes) to thereby forestall non-productive recombination with carriers of opposite type.
Abstract: Modulation depths in excess of 50% are achieved in well designed devices employing a laser diode for the conversion of modulating microwave signals into optical signals, by providing for suppression of microwave signals adventitiously present in the optical signal.