Abstract:
Die Erfindung betrifft eine tragbare Gasanalysevorrichtung zum Durchleiten eines Gasflusses, insbesondere für leicht flüchti-ge Verbindungen, die einen Suchermesspfad (2) und einen Trennmesspfad (4) umfasst. Erfindungsgemäß erstreckt sich der Suchermesspfad (2) von einer Probengaseintrittsöffnung (20) zu einer ersten Abluftöffnung (21), wobei ein Verbindungspfad (3) von dem Suchermesspfad (2) abzweigt zu einem Trennmesspfad (4), und dieser Trennmesspfad (4) sich von dem Verbindungspfad (3) zu einer zweiten Abluftöffnung (41) erstreckt und mit einer Trägergaseintrittsöffnung (40) verbunden ist, wobei die Gasanalysevorrichtung (1) ein Steuerelement (5, 23, 43, 44) aufweist, das zum Umkehren des Gasflusses im Verbindungspfad (3) ausgebildet ist. Mit der Erfindung werden Mehrfachstrukturen in der Gasanalysevorrichtung vermieden. Es wird eine kompakte und schnelle Gasanalysevorrichtung geschaffen, die kaum Verbrauch und Verschleiß aufweist.
Abstract:
A method and system for continuous measurement chromatograph involves stochastically modulating a system variable. The sample can be introduced into a chromatography column. The sample introduction can be modulated stochastically. The sample output from the column can be detected and processed with the stochastic input to provide a sample analysis.
Abstract:
The present invention includes an apparatus (10) and method for detecting nitrogen gas comprising: a conduit (12) for a gas sample (16); one or more hollow core photonic crystal fibers HC-PCF (20) having a proximal portion and a distal portion, wherein the proximal portion is in communication with the gas sample (16) in the conduit (12); a laser (14) positioned to strike the gas sample (16) in the conduit (12) and opposite the one or more hollow core photonic crystal fibers (20); and a Raman spectra detector (30) connected to the distal portion of the hollow core photonic crystal fibers (20), wherein a Raman spectra is generated when the laser (14) strikes the gas sample (16) that is detected by the Raman spectra detector (30).
Abstract:
A system and method to generate a concentration gradient eluent flow are described. The concentration gradient eluent flow ca n include at least two different generants. A liquid can be pumped to an eluent generating device. A first controlling signal can be applied to a first eluent generator to generate a first generant. A second controlling signal can be applied to a second eluent generator to generate a second generant. Either the first and/or the second controlling signal can be varied as a function of time to generate the concentration gradient eluent flow.
Abstract:
A liner for mixing the sample gas and a carrier gas and delivering the gas mixture to the inlet end of a capillary tube of a gas chromatograph for analysis, comprises (a) a transparent tube having an inlet and an outlet and a bore with an inside surface, and (b) at least one glass subcomponent permanently affixed to the liner tube wherein the subcomponent is at least one color.
Abstract:
The present invention relates to fosamprenavir calcium (la) substantially free of isomer impurity, (3R) tetrahydro-3-furanyl(1S,2R)-3-[[(4-aminophenyl) sulfonyl] (isobutyl) amino]- 1-benzyl-2-(phosphonooxy)propyl carbamate (lb), and its process for preparation thereof. The present invention also provides fosamprenavir calcium intermediate, (S)-3- tetrahydrofuranyl-N-succinimidyl carbonate (Ila) substantially free of (R)-3- tetrahydrofuranylsuccinimidyl carbonate (lib) and its process for preparation thereof.
Abstract:
Vorrichtung zur Durchführung von Chromatographie, vorzugsweise von Flüssigkeits-Prozesschromatographie, insbesondere auf industriellem Gebiet, unter Verwendung jeweils wenigstens einer mit einem Antrieb versehenen Verdrängerpumpe zur Aufgabe von Produkt sowie Eluent (mobile Phase) in mindestens eine Trennsäule (1), wobei der Antrieb (10, 10', 11, 11') jeder Verdrängerpumpe (8, 8', 9, 9') ein hochdynamischer Antrieb ist, der zur Erfassung der Weg-/Zeitdaten mit einem integrierten Gebersystem ausgerüstet ist, die über eine angeschlossene übergeordnete Bewegungssteuerung/-regelung in entsprechende lagegeregelte Fahrbefehle umsetzbar sind.
Abstract:
Described is a device for collecting a fluid sample, such as a biological fluid sample. The device includes a planar collection substrate having an absorbent material. The planar collection substrate includes an impermeable region and a sample collection region. The impermeable region is impermeable to the fluid sample and is embedded in the planar collection substrate in a spatial pattern. The sample collection region is in an area excluded from the spatial pattern and has a shape and a size defined by the spatial pattern. The sample collection region is configured to receive a known volume of the fluid sample. In an alternative form, the device includes a sample collection element disposed in an impermeable planar holder and, in another alternative form, the device includes an absorbent material disposed inside an impermeable tube wall.
Abstract:
An injector (101) for injecting a sample into a chromatography column (161) comprises a sample inlet (105) for feeding the sample into the injector (101), an injection chamber (107) comprises a packing (119) for separating the sample into components thereof, and a first sample outlet (109) intended to be in fluid communication with the chromatography column (161). The injector (101) may be used in a chromatography system (159) for analyzing a sample.