Abstract: A residential subdivision layout for high density developments is disclosed which includes placing residential buildings on lots in a configuration such that the front facade of the residential buildings faces a common area, preferably a green space, while he rear facade of the buildings includes a vehicle garage entrance and faces a vehicle passageway. A private courtyards are included between residential buildings on adjacent lots, preferably, on forward portions of the lots between residential buildings such that the courtyards are near, and within visual sight of the common area, but separated from it by a privacy barrier, such as a fence or shrubbery. Preferred configurations not only provide a usable and private outside areas in view of a common space, but create openings between the buildings that allow natural light to enter the interior of the buildings through windows adjacent to the courtyards.

Abstract: A residential subdivision layout for high density developments is disclosed which includes placing residential buildings on lots in a configuration such that the front facade of the residential buildings faces a common area, preferably a green space, while the rear facade of the buildings includes a vehicle garage entrance and faces a vehicle passageway. A private courtyards are included between residential buildings on adjacent lots, preferably, on forward portions of the lots between residential buildings such that the courtyards are near, and within visual sight of the common area, but separated from it by a privacy barrier, such as a fence or shrubbery. Preferred configurations not only provide a usable and private outside areas in view of a common space, but create openings between the buildings that allow natural light to enter the interior of the buildings through windows adjacent to the courtyards.

Abstract: Polymer blend materials composed of an aromatic polyamide and flexible polyamide wherein the aromatic polyamide molecules are uniformly dispersed in a matrix of the flexible polyamide which are produced by first blending the flexible polyamide and monomer(s) for the aromatic polyamide in a solvent, then next polymerizing the monomer(s) in the presence of a phosphite compound, resulting in a transparent gel product capable of being fabricated into useful shaped articles without causing marked phase separation observed in polymer blend materials obtained by conventional coagulation method. The in situ formed aromatic polyamide is uniformly dispersed in the flexible polyamide matrix even in fabricated forms, giving improved transparency over the starting flexible polyamide and improved resistance toward chemicals such as acids, especially after heat treatment.

Abstract: A polymeric material which is capable of forming high modulus, biaxially orientable structures of a cholesteric mesophase, wherein said polymeric material comprises an optically active monomer which is condensation co-polymerized with at least one p-phenylene containing monomer which is itself capable of forming a polymer exhibiting a nematic mesophase, or which is capable of being copolymerized with a second monomer to form a nematic mesophase, or which is capable of being copolymerized with racemic mixture of said optically active monomers to form a nematic mesophase, wherein the resulting copolymer is characterized by a degree of inflexibility sufficient to form a mesophase and wherein said optically active monomer is present in said polymer after copolymerization in an amount sufficient to impart optical activity to said polymer sufficient to form a cholesteric mesophase.

Abstract: A process for improving tensile properties of aramid fibers and structurally related fibers is described. The process involves soaking the fibers in a liquid tertiary amine maintained at a temperature of at least 80.degree. C.

Abstract: A heating device for heating corrosive vapours includes a casing defining a vapour flow path having an inlet and an outlet. A tubular metallic electric resistance heating element is disposed in the flow path and arranged such that the vapours being heated successively pass in opposite directions along the interior and exterior of the element in flowing from the inlet to the outlet of the casing. To accomodate thermal expansion and contraction, one end of the element is connected to the casing by means of a flexible coupling there being provision to maintain at least a part of the flexible coupling immersed in a body of an electrically non-conductive liquid capable of shielding the coupling from the corrosive vapours during operation of the device. The non-conductive liquid may be maintained in the liquid state by circulation through a heat exchanger.

Abstract: High molecular weight, thermally resistant heterocyclic polymers containing two or more different heterocyclic linkages occurring in an ordered sequence with aromatic linkages are prepared and solutions thereof used to spin fibers.