摘要:
In a method and apparatus for measuring the optical absorption of samples having a light source (1), a photoelectric converter (8), a measurement beam path extending between the light source (1) and the converter (8), in which path the sample to be examined is arranged, a reference beam path extending between the light source (1) and the converter (8), in which path a reference sample is arranged, and a motor-driven chopper disc (10), the chopper disc (10) is configured with a first number of first openings (15) unblocking only the measurement beam path and a second number of second openings (16) unblocking only the path for the reference beam. A lock-in amplifier (21) and a device (17) for synchronising the lock-in amplifier (21) with the chopper disc (10) is connected to the converter (8) and an evaluation circuit (26) establishes the quotient of the transmitted intensity of the reference beam path detected by the converter (8) and the transmitted intensity of the measurement beam path detected by the converter (8) as a measurement for the concentration of the sample in such a way that the decrease in the intensity of the beam by absorption leads to an increase in sensitivity.
摘要:
In a method and apparatus for measuring the optical absorption of samples having a light source (1), a photoelectric converter (8), a measurement beam path extending between the light source (1) and the converter (8), in which path the sample to be examined is arranged, a reference beam path extending between the light source (1) and the converter (8), in which path a reference sample is arranged, and a motor-driven chopper disc (10), the chopper disc (10) is configured with a first number of first openings (15) unblocking only the measurement beam path and a second number of second openings (16) unblocking only the path for the reference beam. A lock-in amplifier (21) and a device (17) for synchronising the lock-in amplifier (21) with the chopper disc (10) is connected to the converter (8) and an evaluation circuit (26) establishes the quotient of the transmitted intensity of the reference beam path detected by the converter (8) and the transmitted intensity of the measurement beam path detected by the converter (8) as a measurement for the concentration of the sample in such a way that the decrease in the intensity of the beam by absorption leads to an increase in sensitivity.
摘要:
A microrheoscopic detector for gases including two thin wire resistance thermometers and a heating conductor disposed between the two resistance thermometers, the resistance thermometers being positioned in the area of influence of the heating conductor and spaced therefrom in a definite spatial fixation, the heating conductor having a span transverse gas flow path and comprising a plurality of parallel conductor legs laying in the span in the same plane as the resistance thermometers.
摘要:
This invention provides a process and an apparatus for the detection of toxicity in surface waters, by which the fluorescence of a water sample is measured in that the correlation, especially the ratio, between the prompt fluorescence and retarded fluorescence of the water sample is determined, which contains a toxicity-sensitive bioorganism. The apparatus comprises a combination of a first fluorescence measuring means for measuring prompt fluorescence and a second fluorescence measuring means for measuring retarded fluorescence as well as a signal correlation means for correlating the output signals of two fluorescence measuring means with each other to form an output quantity indicating the toxicity of the water sample.
摘要:
The present invention involves a pharmaceutical formulation comprising a liposome having a therapeutically effective concentration of an aromatic polyene macrolide antibiotic. The aromatic polyene macrolide antibiotic usable in the practice of the present invention is selected from the group consisting of candicidin, hamycin, aurefungin, ascosin, ayfattin, azacolutin, DJ400-B, trichomycin, levorin, heptamycin, candimycin or perimycin. The most preferred aromatic polyene macrolide antibiotic is candicidin. An important aspect of the present invention is a method for treating disseminated fungal infection in an animal comprising administering to an animal such as a human a pharmaceutical formulation comprising a liposome having a therapeutically effective amount of aromatic polyene macrolide antibiotic as described above. The preferred method of such administering is parenteral and the therapeutically effective amount is between about 1 mg/kg body weight and about 20 mg/kg body weight, more preferably between about 2.5 mg/kg body weight and about 6 mg/kg body weight. The parenteral administration is intravenous, intraarterial, subcutaneous, intramuscular, intralymphatic, intraperitoneal or intrapleural. The microorganisms which may be treated by the methods of the present invention comprise C. albicans, C. tropicalis, C. neoformans, aspergillus, cryptococcus, phycomycetes, fusarium, or trichosporin.
摘要:
A paramagnetic gas measuring device/instrument including an infrared radiator for irradiating diamagnetic members of the device and for creating a climate within a measuring chamber suitable to evaporate moisture from the members and a gas being analyzed.
摘要:
In a throat stopper for shaft furnaces, in particular blast furnaces with two hoppers of which an upper hopper is rotatable through a drive device, the upper hopper is designed, by a stationary hood equipped with charging flap valves, as a sluice chamber to be closed pressureproof. For sealing the stationary hood relative to the rotatable upper hopper, there is disposed, at the hood, a peripheral flexible inflatable bellows. The bellows can be pressed against the wall of the upper hopper pneumatically or hydraulically. While material is being charged in the upper hopper, one of the charging valves is open and the bellows is pressureless. During, or shortly after, the charging, the uppr hopper is rotated. For filling the lower hopper, the valves of the upper hopper are closed, bellows is inflated, and the upper sluice chamber is pressurized.
摘要:
A method for manufacturing a film resistor for use as a thermal conductivity detector, particularly for gas analyzers. The film resistor is composed of a carrier of insulating material and of a thin resistance layer, preferably composed of platinum, that is applied to the carrier by cathode sputtering in an atmosphere inert gas. The resistant layer and the carrier are cleaned proceeding from the metallized side using an argon sputtering process. The film resistor is then coated with at least one plasma-enhanced CVD layer for the purpose of protection against aggressive gases.
摘要:
In a throat stopper for shaft furnaces, in particular blast furnaces with two hoppers of which an upper hopper is rotatable through a drive device, the upper hopper is designed, by means of a stationary hood equipped with charging flap valves, as a sluice chamber to be closed pressureproof. For sealing the stationary hood relative to the rotatable upper hopper, there is disposed, at the hood, a peripheral flexible inflatable bellows. The bellows can be pressed against the wall of the upper hopper pneumatically or hydraulically. While material is being charged in the upper hopper, one of the charging valves is open and the bellows is pressureless. During, or shortly thereafter, the charging, the upper hopper is rotated. For during the lower hopper, the valves of the upper hopper are closed, bellows is inflated, and the upper hopper is hopper are closed, bellows is inflated, and the upper sluice chamber is pressurized.
摘要:
In a friction bearing system for a rapidly rotating shaft of an apparatus for measuring the optical absorption of a sample under analysis by way of an optical radiation source projecting a beam on the sample, the chopper system for the periodical interruption of the beam includes a rotatably mounted chopper disk provided with light-admitting openings and a controlled-speed drive system, as well as a radiation detector for the light affected by the sample. Both ends of the shaft fixedly joined to the chopper disk are provided with pivots corresponding to bushes, one of which is held by a spider which is affixed to the housing part that holds the other bush. The spider is provided with a bore running at an angle to the shaft, and the longitudinal axis of this bore intersects the axis of rotation of the shaft. A magnet is held for longitudinal displacement in the bore and its field acts upon a ring disposed on the shaft in order to assure the quiet and wear-free spinning of the chopper disk.