An analysis system in which air in a specimen exchange chamber is evacuated by an oil-sealed rotary vacuum pump and which employs electron incorporates a purge gas supply means at the inlet side of the oil-sealed rotary vacuum pump. The purge gas supply means supplies a small quantity of purge gas when the air in the specimen exchange chamber is evacuated to the almost ultimate pressure of the pump.

Method and apparatus for use in burners of furnaces such as those used in steam cracking. The apparatus includes a burner tube having a downstream end and an upstream end for receiving fuel and air, flue gas or mixtures thereof. A burner tip is mounted on the downstream end of the burner tube adjacent a first opening in the furnace, so that combustion of the fuel takes place downstream of the burner tip. At least one passageway has a first end at a second opening in the furnace and a second end ...

A sensor uses an immobilized affinity component capable of interacting with analyte species and being associated with a conducting polymer such that the interaction of the affinity component and the analyte induces change in the electrical properties of the polymer. An AC signal is applied to the polymer, and the induced change in impedance resulting from the interaction is measured. The impedance is measured at a frequency or frequencies corresponding to a peak or peaks in the relationship betw...

A method for the radioimmunoassay of small molecules consisting of bringing the large-molecule antibody of the small-molecule antigen to be determined into a slit-shaped chamber between dialysis membranes in a reaction vessel, bringing the antigen to be determined into this tank, into which a specified quantity of the radioactive form of this antigen has been added. During incubation the antigen and its radioactive form freely penetrate through the membranes and react with the antibody, whereupo...

Articles are described which utilize a unique photochemical property of a certain class of heterocyclic compounds. These heterocyclic compounds are the mono- and bicyclic aziridines. Oriented crystals of these heterocyclic compounds are photochromic in an unusual way. The effect of the excitation radiation and the strength of the resulting absorption band responsible for the appearance of color depend on the polarization of the radiation. These articles contain at least one optically smooth surf...

A display is disclosed. The display includes a plurality of pixels configured to emit light. The display also includes a plurality of pixel control circuits that are each configured to regulate emission of light from a pixel. The pixel control circuits each include one or more two-terminal switching devices that include an organic semiconductor.

A piston engine employing a flywheel rotor, in lieu of a crankshaft, driven hydraulically by the piston. One end of a plunger is connected to the piston, the other end being slidably disposed in an hydraulic cylinder. In the combustion mode, fuel and oxygen are injected and spark ignited, both by the same variable speed D.C. speed control motor. The piston-driven plunger displaces hydraulic fluid in the cylinder through a high speed orifice to impinge against spaced cavity surfaces formed along ...

Image, video, or audio data is encoded with both a frail and a robust watermark. The two watermarks respond differently to different forms of processing (e.g., copying the object may render the frail watermark unreadable), permitting an original object to be distinguished from a processed object. Appropriate action can then taken in response thereto.

A compute engine's central processing unit is coupled to a coprocessor that includes application engines. The central processing unit initializes the coprocessor to perform an application, and the coprocessor initializes an application engine to perform the application. The application engine responds by carrying out the application. In performing some applications, the application engine accesses cache memory--obtaining a physical memory address that corresponds to a virtual address and providi...

A compute engine includes a central processing unit coupled to a coprocessor. The coprocessor includes a sequencer coupled to a set of application engines for performing operations assigned to the compute engine. The sequencer is coupled to application engines through a set of data, enable, and control interfaces. An arbiter couples the sequencer and application engines to memory. Alternatively, the coprocessor may include multiple sequencers, with each sequencer being coupled to a different set...