Abstract:
By treating paper, newsprint, and other waste cellulosic materials with an acidic fire retardant chemical the product spectrum formed during ensuing pyrolysis of the treated materials is reduced from approximately 60 compounds, none of which is produced in amounts justifying recovery, to a small number of principal products, including water, acetic acid, furfural, 5methyl-2-furfural and a compound produced in relatively large amounts which has been identified as 1,5-anhydro-3,4-dideoxyDelta 3- Beta -D-pyranosen-2-one. The latter compound has utility as a precursor to synthetic resins and surfactants and can be converted by oxidation to the novel compound, 1,5-anhydro-3,4dihydroxy- Delta 3- Beta -D-pyranosen-2-one.
Abstract:
Twelve analogs of diethylcarbamazine as prepared by acylation of 3- and 8-methyl-3,8-diazabicyclo(3.2.1)octane, 2-methyl-2,5diazabicyclo(2.2.2)octane, and 2-methyl-2,5diazabicyclo(2.2.1)heptane with diethylcarbamyl chloride, ethyl chloroformate, ethyl isocyanate, and cyclohexanecarbonyl chloride. These compounds are formally derived from diethylcarbamazine in possessing two- or one-carbon bridges over the piperazine ring. The compounds have utility as antifilarial agents and as bronchodilators.
Abstract:
A compressional acoustic image field propagating in a fluid filled container is converted to electrical impulses which in turn provide a means for converting the incident compressional image field to a visual representation by locating a linear array of piezoelectric elements in intimate coupling contact with a thin, acoustically transparent window upon which the acoustic image field impinges. Coupling between the acoustic image field and the array of transducers is improved by providing a thin layer of coupling liquid on the outside of the window (the side in contact with the transducer array). The linear array effectively sweeps the entire compressional acoustic image field of interest mechanically moving the entire array back and forth (in a direction orthogonal to the linear array) across the window.
Abstract:
Herbicidal compositions including a benzazaboroxane precursor such as an aryl substituted N,N''-bis-(hydroxyalkyl)-2hydroxybenzylamine compound are disclosed. Increased herbicidal activity is observed with increasing oil solubility of the compound. Activity appears to proceed by binding or mining boron from the plant due to the ligand action of the compounds in forming benzazaboroxanes.
Abstract:
In a waveguide resonator, either coaxial, or non-coaxial, there are inserted spaced irises which establish capacitances between the conductors of the waveguide structure at the location of each iris. These capacitances tune the resonance of the waveguide cavity, which would generally be used in a bandpass filter. Switch means are provided for each iris, for discretely altering the value of the capacitance established, whereby the resonator or filter may be tuned to a large number of different center frequencies.
Abstract:
A large increase in the signal strength of the surface wave transmitted from a buried or sub-surface antenna is achieved by shaping the interface region, at which the sub-surface wave is directed, into a cylindrical or spherical lens.
Abstract:
GLYCOLIDE IS PREPARED IN HIGHLY PURE FORM FROM OHALOACETYLGLYCOLIC ACID SALTS BY ELIMINATION OF A MINERAL ACID SALT AND ATTENDANT CLOSURE OF THE RING. IN A TYPICAL PREPARATION, THE NOVEL COMPOUND O-CHLOROACETYLGLYCOLIC ACID IS CONVERTED TO A SALT AND GLYCOLIDE IS THEN FORMED AS THE SALT IS HEATED IN A VACUUM SUBLIMATION APPARATUS WHEREIN THE GLYCOLIDE CONDENSES ON A COOL SURFACE. THE GLYCOLIDE CAN BE POLYMERIZED TO FORM POLYGLYCOLIC ACID OF HIGH PURITY WHICH IS USEFUL IN THE FABRICATION OF SUTURES WHICH ARE ABSORBABLE IN BODY FLUIDS.
Abstract:
A compound lens structure for converting the response of a transducer of large lateral extent to one of significantly smaller dimensions employs a converting lens having a conical front surface in contact with the rear surface of an auxiliary hemispherical lens to allow spherical sonic waves emanating from or converging toward the point of contact to enter or leave the converting lens only through the area of contact. The rear surface of the converting lens is chosen to be a hyperbola of revolution in order that diverging waves entering through the area of contact be refracted into plane waves transmitted to the transducer. Space between the two lens is sealed and filled with a gas to enhance the masking effect of the conical surface by total reflection of waves entering that sealed space from the auxiliary lens.
Abstract:
A frequency-selective directional coupler is provided which comprises a fast-wave transmission line placed in proximity to a slow-wave transmission line. The fast wave line can be a waveguide, strip-line, or microstrip line which follows a fairly direct path between two points. The slow wave line can be a helix or a meander line.