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Showing 1 to 20 of 28 for “"CIMS"”.
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Atmosphärische gasförmige Vorläufer von Aerosol und Ozon: Messungen mit CIMS-Methoden auf einem Flugzeug und am Boden
… 0-12km durchgeführt. Diese Messungen mit (Ultra-)CIMS (= Chemische-Ionisations-Massenspektrometrie) beinhalteten besonders die Spurengase SO2, H2SO4, (CH3)2CO (Aceton) und CH3OH (Methanol). Wandverluste und Wasserdampf-Querempfindlichkeiten in der Sammelleitung wurden mit Hilfe von Kalibrationen …
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Flugzeug-gestützte Messungen atmosphärischer Spurengase in der oberen Troposphäre und unteren Stratosphäre : Weiterentwicklung und Einsatz einer hochempfindlichen CIMS-Sonde
… der Chemischen Ionisations Massenspektrometrie (CIMS) wurde zu diesem Zweck weiterentwickelt. Die Modifikationen und diagnostischen Untersuchungen ermöglichten zuverlässige Salpetersäuremessungen, die allgemein als sehr schwierig gelten. Messungen im Sommer über Mitteleuropa konnten zeigen, dass …
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Social class: the role of class identity management strategies in higher education
… role of class identity management strategies (CIMS). Such strategies are utilized among university students from working-class backgrounds in response to status devaluation. Four commonly observed CIMS in the university context are outlined: (1) desire to change, (2) assimilation, (3) hiding, …
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Atmosphärische Untersuchungen der Wechselwirkung von Mineralstaub mit den Spurengasen HNO3 und SO2
… erfolgte mittels einer hochempfindlichen CIMS-Sonde (CIMS = Chemische-Ionisations-MassenSpektrometrie). Die Weiterentwicklung der Kalibriertechnik sowie umfangreiche diagnostische Messungen zur Optimierung der CIMS-Technik waren Bestandteil dieser Arbeit. Sie beinhaltete die Entwicklung …
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Transition Pathways and Capabilities of Climate-Induced Migrants: The Case of Ready-Made Garment Workers in Bangladesh
… investigates how climate-induced migrants (CIMs) navigate their transitions into urban life, focusing particularly on their efforts to rebuild livelihoods and pursue stability after displacement due to environmental and climatic disasters. It critically analyses the multi-stage transitions …
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Aqueous-phase Organic Chemistry in the Atmosphere
… Chemical Ionization Mass Spectrometry (Aerosol CIMS), was employed to quantitatively monitor aqueous-phase OH oxidation of glyoxal and methylglyoxal. Quantification of all the major reaction products was achieved, permitting complete reaction mechanisms to be presented. An unexpected class of …
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A structured approach to production control in integrated manufacturing systems
… ln a Computer Integrated Manufacturing System (CIMS) these decisions and algorithms span several functions, require information from several sources, and have consequences in several sectors of the manufacturing system. This dissertation is concerned with the development of a structured …
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Atmospheric Aerosol Particle Formation : Aircraft-Based Mass Spectrometric Measurements of Gaseous and Ionic Aerosol Precursors
… trap chemical ionisation mass spectrometer (IT-CIMS) and a quadrupole mass spectrometer (QMS). The ion molecule reaction to determine atmospheric SO2 was calibrated isotopically. So problems arising from wall losses and ion hydration are circumvented in an elegant manner. The modified IT-CIMS …
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A framework to guide the incremental implementation of a computer- integrated manufacturing system
… of a Computer-Integrated Manufacturing System (CIMS). The framework is premised upon the facts that: (1) CIMS design is accomplished through a series of evaluation decisions sequenced through time and (2) evaluation is accomplished by decomposing the entire manufacturing organization into its …
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Studies of heterogeneous ice chemistry relevant to the atmosphere
… order of 100 nm. We found using the flow tube-CIMS technique that the presence of the QLL enhances the chlorine-activation reaction of HC1 with ClONO₂. The presence of the QLL also enhances CH₃COOH adsorption. We find that the solubilities of HC1 and CH₃COOH in the QLL are intermediate between …
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Chemistry of the sea ice/ snowpack/ atmosphere system in coastal Antarctica
… using a Chemical Ionisation Mass Spectrometer (CIMS). During specific periods in the spring the CIMS was configured to measure concentrations of BrO, Br2 and BrCl. In addition, concurrent measurements of surface ozone and local meteorology were made. Presented here is an analysis of these …
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Trace Gas-Induced Brine and Disordered Interfacial Layers on Ice
… with chemical ionization mass spectrometry (CIMS) detection of HNO_3 in the gas phase. Our ellipsometry results show that exposure to HNO_3 induces surface disordering on ice at a range of environmentally relevant temperatures and HNO_3 partial pressures, particularly in the vicinity of the …
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Field measurements and atmospheric simulation chamber studies of selected biomass burning marker compounds
… Chemical Ionisation Mass Spectrometer (ToF-CIMS) was deployed in Cork City, for the first comprehensive field study on the VOCs associated with residential burning of solid fuels (wood, peat, coal) in Ireland. In the field study, a range of phenols and their nitro derivatives were detected …
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Laboratory and Mechanistic Studies of Volatile Organic Carbon Oxidation Systems in the Atmosphere
… in the Chemical Ionization Mass Spectrometers (CIMS) which are used to measure a broad range of oxidation products. Mechanistic simulations are also frequently performed to emulate chamber chemistry with less effort and fewer complications than may arise during a chamber experiment, but the …
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Chemiionisations-Massenspektrometrie von HNO3 an einer Simulationskammer für stratosphärische Aerosole
… wurde ein Chemiionisations-Massenspektrometer (CIMS) zur quantitativen Bestimmung der HNO3-Gesamtmenge im Aerosol (Summe aus Gas- und Partikelanteil) aufgebaut. Für den Nachweis wird eine Probe durch beheizte Teflonleitungen aus der Kammer entnommen. Vor Erreichen der Detektionszone, einem …
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Field and current induced magnetization reversal in patterned Pseudo Spin Valve devices
… coupling. Current induced magnetic switching (CIMS) experiments were conducted, and threshold densities of the order of 1011 A/m2 were used to switch the magnetization under an external bias field, and the critical current decreased with increasing bias.
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Tides, Winds, and Reactive Halogens A Study of Multiphase Chemistry in the Marine Boundary Layer
… Chemical Ionization Mass Spectrometer (ToF-CIMS). The t-IMR samples ambient air at a laminar high volume flow (at a rate of 10 L/min), and demonstrates a reduction in artificial signals/background from wall effects by multiple orders of magnitude across compound volatilities compared to …
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A study of the tropospheric oxidation of volatile organic compounds using chemical ionization mass spectrometry
… in this pathway was also accomplished using CIMS. Biogenic hydrocarbons also have complex oxidation mechanisms which are poorly understood. Many of these compounds are cyclic alkenes or dienes with complicated oxidation mechanisms. Propylene (C3H6) is a very simple alkene and can be studied …
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Investigating the Structure and Physical Stability of Glp1-Like Peptides Using Mass Spectrometry
… instruments, cyclic ion mobility spectrometry (cIMS) and millisecond HDX-MS were also used in this work to improve the resolution with which we study therapeutically relevant peptides. cIMS was successfully applied to the lipidated GLP-1-like peptide system to detect and identify the location of …
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