摘要:
In a wide band receiver, a pulse signal is directed through a plurality of narrow band channels. The pulse input is a short duration pulse of several cycles of the signal. The energy content in each of the narrow band channels is measured and compared to adjacent channels. During the steady state time, when the pulse signal is neither rising or falling, the energy differences between a narrow band channel being at the location of the incoming signal frequency and its adjacent channels would be maximum and exceed established thresholds. A comparison is then made with these established thresholds to produce logic signals demonstrating that the incoming is in an indicated narrow band channel. Where the signal is between two channels and in the crossover region, then the logic signals produced during the steady state pulse time would be indicative of substantially equal energy in the two narrow band channels having portions in the crossover region while the energy differences between each of those narrow band channels sharing the crossover region with their respective adjacent channels would be greater than the CCR levels. Logic signals indicative of these energy relationships are then processed to produce the signal indicative that the incoming signal is in the crossover region. The system operates to produce logic signals only during the steady state time of the pulse and is free of splatter which would otherwise prevent a clear and unambiguous indication of frequency.
摘要:
An omnidirectional receiver includes directional arrays for input signal directional arrays for input signal detection. The array signals are compared to determine which array has developed the greatest signal and its direction. The receiver is then stirred or switched to the identified directional array. After a delay to allow for steering, the input signal from the selected array is phase detected. Then after a second delay one of the phase detected signals is divided and replicated to determine the internal phase error and for phase comparison.
摘要:
A method is disclosed for determining calcium ion content of serum which comprises calibrating a potentiometric analytical system with calcium standards having a solution containing both TRIS and BisTRIS at a pH of 7.5. The serum sample is diluted with a silicone oil/water emulsion which may further contain a protein complexing agent such as iron, zinc, cadmium, nickel or copper. Measurement is then carried out on the diluted serum sample.
摘要:
A process of blending two or more polymers having varying viscosities by blending the polymers in the melt in the presence of a solid particulate material to form polymer blends having improved dispersion of the polymer.
摘要:
An analog duty cycle to BCD converter for receiving pulsed digital signals (10) from an electronic computing unit (11) for operating an electromagnetic operated exhaust gas recirculation valve (12) having a plurality of valve actuators each responding to a binary valued voltage signal. The converter receives pulsed electrical signals (10) and through a low pass active filter means (14) and a comparator means (18), generates binary weighted control signals (22) for operating power transistors in a power switch means (24), a threshold means (20) provides a plurality of threshold voltage signals to the comparator means (18) to generate the control signals (22).
摘要:
Liquid scintillation vials are disclosed formed from polyethylene or polypropylene and fluorinated on at least the inner surface. The advantageous physical properties and disposability of polyethylene or polypropylene are retained, while reducing permeation of organic solvents of the scintillation cocktail into or through the walls. Therefore problems of vial swelling, resulting in jamming of scintillation counters, are avoided.
摘要:
A composition of material for use as a friction material in a brake and its method of manufacture. Liquid double salts of dibasic and monobasic (ammonium-potassium hydrogen) phosphoric acid (DSP) is added to a dry mixture of reinforcing fiber, friction modifiers, fillers and phenolic resin to create a high viscosity slurry. Thereafter, a metallic (magnesium) oxide and para formaldehyde (para) are added to the slurry. Molds which have been previously heated are filled with the slurry and any excess removed. The metallic oxide reacts with the DSP and the para reacts with the phenolic resin to create a two binder matrix for holding the reinforcing fiber, friction material and fillers in a fixed relationship corresponding to the shape of a brake pad. The brake pads are removed from the molds and transported to a ventilated chamber where the internal curing proceeds at or near ambient temperature to complete the manufacture of the brake pad.
摘要:
The invention is a three-piece contact assembly for an electrical connector. The contact assembly is characterized by an inner sleeve (10) captivated between a forward outer sleeve (20) and a rear outer sleeve (30) to eliminate deformation and relative movement between the sleeves of a contact assembly.
摘要:
This invention relates to the reduction of sulfur dioxide to elemental sulfur wherein a feed mixture of a sulfur dioxidecontaining gas and a hydrocarbon reducing agent is reacted at elevated temperatures in the presence of minor amounts of elemental sulfur.
摘要:
Present process relates to the purification of carbonate process solution which comprises passing said carbonate process solution through a bed of activated carbon to remove organic contaminants from said solution until the adsorbent capacity of said bed is reduced and regeneration of said bed is effected by passing an aqueous solution through said bed to remove the adsorbed organics, said aqueous solution being maintained at elevated temperatures.