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  • mixtures
  • For the first time, chemo-resistive gas sensors are exposed to dynamic gas mixtures generated with several concentration levels at the sources. (mdpi.com)
  • We used a support vector machine as a tool to show that chemo-resistive transduction can be utilized to reliably identify chemical components in dynamic turbulent mixtures, as long as sufficient gas concentration coverage is used. (mdpi.com)
  • Fonollosa J, Rodríguez-Luján I, Trincavelli M, Vergara A, Huerta R. Chemical Discrimination in Turbulent Gas Mixtures with MOX Sensors Validated by Gas Chromatography-Mass Spectrometry. (mdpi.com)
  • detection
  • Chemical detection systems based on chemo-resistive sensors usually include a gas chamber to control the sample air flow and to minimize turbulence. (mdpi.com)
  • thermal mass
  • The miniature size is achieved by replacing a conventional convectively-heated column oven with a low thermal mass (LTM) column bundle with direct-contact electrical resistive heating. (perkinelmer.com)
  • study
  • The urinary metabolomic study based on gas chromatography-mass spectrometry (GC-MS) had been developed to investigate the possible antidepressant mechanism of chlorogenic acid (CGA) in a rat model of sleep deprivation (SD). (hindawi.com)
  • The science payload mass is about 45 kg and consists of: The lander radio-science experiment (LaRa) will study the internal structure of Mars, and will make precise measurements of the rotation and orientation of the planet by monitoring two-way Doppler frequency shifts between the surface platform and Earth. (wikipedia.org)
  • Instruments
  • By 1966 Finnigan and collaborator Mike Uthe's EAI division had sold over 500 quadrupole residual gas-analyzer instruments. (wikipedia.org)
  • peak
  • HCO2H + 0.5O2 ↔ CO2 + H2O CO2 + 4H2 ↔ CH4 + 2H2O The reactions are essentially instantaneous, compared to the time scales of typical chromatography, resulting in minimal peak broadening and tailing. (wikipedia.org)
  • Heating this trap releases the analytes once again, but this time in an even smaller volume of gas (typically 100-200 µL), resulting in improved sensitivity and better GC peak shape. (wikipedia.org)
  • ions
  • Multiply charged ions are produced further extending mass range. (wikipedia.org)
  • CCS values are important distinguishing characteristics of ions in the gas phase, and in addition to the empirical determinations it can also be calculated computationally when the 3D structure of the molecule is known. (wikipedia.org)
  • The action of the primary droplets hitting the surface produces secondary droplets that are the source of ions for the mass spectrometer. (wikipedia.org)
  • The charged droplets pick up the sample through interaction with the surface and then form highly charged ions that can be sampled into a mass spectrometer. (wikipedia.org)
  • exhibit very high gas-phase acidities, even compounds with a rather low gas-phase basicity are readily ionized by proton transfer, yielding [M+H]+ quasimolecular ions. (wikipedia.org)
  • Typically
  • They typically cover large areas, have source rocks in close association with these unconventional reservoir rocks, and are mostly gas (and in some cases oil) charged throughout their extent. (wikipedia.org)
  • Modern thermal desorbers can also accommodate two-stage operation, whereby the gas stream from the sorbent tube (typically 100-200 mL) is collected on a narrower tube integral to the thermal desorber, called the focusing trap or cold trap. (wikipedia.org)
  • Physical
  • The physical quantity ion mobility K is defined as the proportionality factor between an ion's drift velocity vd in a gas and an electric field of strength E. v d = K E {\displaystyle v_{d}=KE} Ion mobilities are commonly reported as reduced mobilities, correcting to standard gas density n0, which can be expressed in standard temperature T0 = 273 K and standard pressure p0 = 1013 hPa. (wikipedia.org)
  • trap
  • Higher trap temperatures also reduce the amount of water condensing inside the trap (when transferred to the GC column, water can reduce the quality of the chromatography). (wikipedia.org)
  • cell
  • In warm blooded creatures, there are two expansive sorts of foundational microorganisms: embryonic undifferentiated organisms, which are confined from the inward cell mass of blastocysts, and grown-up immature microorganisms, which are found in different tissues. (pharmaceuticalconferences.com)
  • similar
  • Products labeled as bath salts containing MDPV were previously sold as recreational drugs in gas stations and convenience stores in the United States, similar to the marketing for Spice and K2 as incense. (wikipedia.org)
  • industrial
  • In industrial settings, uses of IMS include checking equipment cleanliness and detecting emission contents, such as determining the amount of hydrochloric and hydrofluoric acid in a stack gas from a process. (wikipedia.org)
  • phase
  • citation needed] IMS was first developed primarily by Earl W. McDaniel of Georgia Institute of Technology in the 1950s and 1960s when he used drift cells with low applied electric fields to study gas phase ion mobilities and reactions. (wikipedia.org)
  • include
  • Continuous-type accumulations include fractured shale and fractured limestone oil and gas, basin-centered gas, coal bed gas, and tight reservoir gas. (wikipedia.org)
  • tube
  • Early thermal desorbers used just single-stage operation, whereby the volatiles collected on a sorbent tube were released by heating the tube in a flow of gas, from where they passed directly into the GC. (wikipedia.org)