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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 845 for “"Gas chromatography"”.
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Chip-Scale Gas Chromatography
… and are thus less prone to cross-contamination. Gas chromatography (GC) is the leading analytical instrument for the analysis of volatile organic compounds (VOCs). Due to its wide-ranging applications, it has received great attention both from industrial sectors and scientific communities. …
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Quantitative detection in gas chromatography
… encountered in quantitative analysis by gas chromatography are discussed, with particular reference to detection systems. The properties of an ideal detector for quantitative analysis are listed. A description is given of the mode of operation of detectors for gas chromatography, and the …
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Semi-Packed Micro Gas Chromatography Columns
Separation of complex gaseous mixtures using gas chromatography (GC) is an important step in analytical systems for environmental monitoring, medical diagnosis, and forensic science. Due to its high resolving power, analysis speed, and small sample size, GC, has become the premier technique for …
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I. The Application of Gas Chromatography to The Determination of Some Physical Constants. Ii. High Temperature Gas Chromatography
Made available in DSpace on 2014-12-05T19:37:08Z (GMT). No. of bitstreams: 1 5902061.pdf: 3908627 bytes, checksum: 4d1f88eadeb5ce5b2ef4c8a766b968cc (MD5) Previous issue date: 1959
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Gas Chromatography of Some Volatile Metal Halides
Made available in DSpace on 2014-12-10T23:01:09Z (GMT). No. of bitstreams: 1 7121089.pdf: 2568530 bytes, checksum: e069673fdfde5e09f5e4b300c8e74f67 (MD5) Previous issue date: 1971
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Machine Learning Classification of Gas Chromatography Data
Gas Chromatography (GC) is a technique for separating volatile compounds by relying on adherence differences in the chemical components of the compound. As conditions within the GC are changed, components of the mixture elute at different times. Sensors measure the elution and produce data which …
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Experimental Studies in Temperature Programmed Gas Chromatography
Temperature programmed gas chromatography (TPGC) is commonly used for the analysis of complex samples with a wide range of boiling points. It is estimated that 80% of GC users implement TPGC on a regular basis. In 1962, John Calvin Giddings was the first to publish a simple model for TPGC. His …
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Negative Temperature Programming using Microwave Gas Chromatography
The microwave region of the electromagnetic spectrum lies between the infrared radiation and radio frequency region and corresponds to wavelengths of 1 cm to 1 m (frequencies of 30 GHz to 300 MHz respectively). Gaisford and Walters developed the microwave GC oven in 2000, which operated at 919 MHz. …
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Analysis of Polymeric Materials by Photolysis-Gas Chromatography
Made available in DSpace on 2014-12-10T23:01:05Z (GMT). No. of bitstreams: 1 7114953.pdf: 2213828 bytes, checksum: 6c8c31e43ef87608d72b689fe5f2e5aa (MD5) Previous issue date: 1970
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Density Modulated Semi-Packed Micro Gas Chromatography Columns
With the continued evolution of MEMS-based gas chromatography, the drive to develop new standalone systems with lower power consumptions and higher portability has increased. However, with improvements come tradeoffs, and trying to reduce the pressure drop requirements of previously reported …
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Pyrolysis-gas chromatography by direct injection of solutions
… and the products formed, in a moving carrier gas stream were investigated. The parameters studied included the effects of pyrolysis temperature, sample size, sample weight, flow rate of the carrier gas, the method of introducing the sample into the pyrolysis unit. An apparatus for …
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Polyethylene glycol stationary phases for capillary gas chromatography
… various silicone stationary phases for capillary gas chromatography have been extensively studied, yet the properties of nonsilicone phases have not been so well investigated. The most popular nonsilicone phases are the high molecular weight polyethylene glycols (HMW PEG) which are commercially …
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Computer analysis of asymmetric peaks in gas chromatography
A digital computer was used to measure accurate gas chromatographic peak symmetry, position and dispersion by central statistical moments. Benzene samples were chromatographed on squalane for columns of 3, 6 and 12 foot lengths and 1/8", 1/ 4" and 1/2" diameters as a function of sample size. Peak …
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Gas chromatography on self assembled single walled carbon nanotubes
… conceivable that separation techniques, such as, gas chromatography (GC) can benefit from their unique properties and nano-scale interactions. Self-assembly, in-contrast to packing these materials in a tube, prevents them from agglomeration and thus facilitates in retaining their …
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Design, Fabrication, and Evaluation of Micro Gas Chromatography Columns
The amalgamation of these developments allows creating microcolumns with performance comparable to commercial fused silicon columns.
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Portable Micro-Gas Chromatography with Multidimensional Compound Identification Analysis
Gas Chromatography (GC) is an analytical technique in the chemistry field widely used to separate compounds present in a sample mixture. Conventional GC systems are an extremely versatile and powerful tool to perform complex separations. However, these systems come with the cost of being bulky and …
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Effluent analysis of model pyrrone compounds by gas chromatography
A gas chromatographic study was made to quantitatively analyze the effluents produced during the thermal cyclization of several polyimidazopyrrolone (pyrrone) model compounds. The study yielded information on analogous polymeric reactions. The model compounds were programed at 5° C/min from 25° to …
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Quantitative analysis of rocket propellant by capillary gas chromatography
… and explosives has been performed extensively by gas chromatography for the past decade. As capillary GC technology has advanced, new opportunities for the improvement of existing methods have developed. This investigation probes several of these possibilities. The effect on quantitation of: the …
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An explosive vapor generator based on capillary gas chromatography
… systems has been developed based on a capillary gas chromatograph. The design of the vapor generator replaces a flame ionization detector on the gas chromatograph with an effluent heater system to provide a cloud of explosive vapor while preventing condensation onto the walls of the capillary …
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MEMS-Based Micro Gas Chromatography: Design, Fabrication and Characterization
… of high performance MEMS-based micro gas chromatography columns having wide range of applications in the pharmaceutical industry, environmental monitoring, petroleum distillation, clinical chemistry, and food processing. The first part of this work describes different approaches to …
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