A5071636457- Advanced Chemical Sensor Technologies
- Mass Spectrometry Techniques and Applications
- Atmospheric chemistry and aerosols
- Analytical Chemistry and Chromatography
- Air Quality Monitoring and Forecasting
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Hydrocarbon exploration and reservoir analysis
- Insect Pheromone Research and Control
- COVID-19 impact on air quality
- IPv6, Mobility, Handover, Networks, Security
- Vehicle emissions and performance
- Public Policy and Administration Research
- Analytical chemistry methods development
- Ethics in Clinical Research
- Job Satisfaction and Organizational Behavior
- Multimedia Communication and Technology
- Optical Imaging and Spectroscopy Techniques
- Biochemical Analysis and Sensing Techniques
- Electrochemical Analysis and Applications
- Fermentation and Sensory Analysis
- Selenium in Biological Systems
- Patient Satisfaction in Healthcare
- Insect and Pesticide Research
- Photochemistry and Electron Transfer Studies
University of Leicester
2005-2017
The University of Texas at Dallas
2017
HCA Healthcare
2015
Turnover research has traditionally examined intention to turnover rather than actual turnover. Such studies assume that leave intent serves equally well as both a proxy for and predictor of employees’ behavior. The purpose this study is provide an agency-level evaluation the usefulness reliable across 180 U.S. federal agencies, using hierarchical (stepwise) multiple regression. Our findings suggest that, at organizational level, are distinct concepts, predicted by different sets variables....
A proton-transfer reaction mass spectrometer based on time-of-flight spectrometry is described. This instrument couples a radioactive ion source and drift tube with reflectron spectrometer. Volatile organic compounds in the gas phase concentrations at parts per billion by volume level can be detected matter of seconds, crucially, multichannel data acquisition TOF-MS means that this detection sensitivity available all channels simultaneously. The typical resolution (m/Δm) excess 1000....
This paper presents results from the first large‐scale in situ intercomparison of oxygenated volatile organic compound (OVOC) measurements. The was conducted blind at large (270 m 3 ) simulation chamber, Simulation Atmospheric Photochemistry a Large Reaction Chamber (SAPHIR), Jülich, Germany. Fifteen analytical instruments, representing wide range techniques, were challenged with measuring atmospherically relevant OVOC species and toluene (14 species, C 1 to 7 approximate 0.5–10 ppbv under...
A drift tube capable of simultaneously functioning as an ion funnel is demonstrated in proton transfer reaction mass spectrometry (PTR-MS) for the first time. The enables a much higher proportion ions to exit and enter spectrometer than would otherwise be case. An increase detection sensitivity volatile organic compounds between 1 2 orders magnitude delivered, using several compounds. Other aspects analytical performance explored this study include effective E/N (ratio electric field number...
Real-time profiling of mango ripening based on proton transfer reaction-time flight-mass spectrometry (PTR–ToF–MS) small molecular weight volatile organic compounds (VOCs), is demonstrated using headspace measurements 'Tommy Atkins' mangoes. VOC metabolites produced during the process were sampled directly, which enabled simultaneous and rapid detection a wide range compounds. Headspace 'Keitt' mangoes also conducted for comparison. A principle component analysis results indicated that...
Abstract The technique of proton transfer reaction mass spectrometry (PTR‐MS) couples a reagent, usually H 3 O + , with drift tube and spectrometer to determine concentrations volatile organic compounds. Here we describe first attempt use chemical ionization (CI) reagents other than species inside PTR‐MS instrument. ability switch types CI provides an extra dimension the technique. This capability is demonstrated by focusing on distinguish several isobaric aldehydes ketones, including...
Abstract. The performance of a new chemical ionization reaction time-of-flight mass spectrometer (CIR-TOF-MS) utilising the environment chamber SAPHIR (Simulation Atmospheric Photochemistry In large Reaction Chamber- Forschungzentrum Jülich, Germany) is described. work took place as part ACCENT (Atmospheric Composition and Change European NeTwork for excellence) supported oxygenated volatile organic compound (OVOC) measurement intercomparison during January 2005. experiment entailed 14...
Chemical ionization reaction time-of-flight mass spectrometry (CIR-TOF-MS) has been used for the analysis of prepared mixtures chemical weapon agents (CWAs) sarin and sulfur mustard. Detection CWA simulants 2-chloroethyl ethyl sulfide, triethyl phosphate, dimethyl methyl phosphonate also investigated. all was shown to be possible using CIR-TOF-MS technique with a variety reagent ions, sensitivity optimized by variation instrument parameters. The process found largely unaffected sample...
The prospects for exploiting proton transfer reaction-time of flight-mass spectrometry (PTR-ToF-MS) in medical diagnostics are illustrated through a series case studies. Measurements acetone levels the breath 68 healthy people presented along with longitudinal study single person over period 1 month. median concentration across population was 484 ppbV geometric standard deviation (GSD) 1.6, whilst average GSD during subject longtitudinal 1.5. An additional is which highlights potential...
The organic content of shale has become commercial interest as a source hydrocarbons, owing to the development hydraulic fracturing ("fracking"). While main focus is on extraction methane, also contains significant amounts non-methane hydrocarbons (NMHCs). We describe first real-time observations release NMHCs from fractured shale. Samples Bowland-Hodder formation (England) were analyzed under different conditions using mass spectrometry, with objective understanding dynamic process gas upon...
Alkanes provide a particular analytical challenge to commonly used chemical ionisation methods such as proton-transfer from water owing their basicity.
The Centers for Medicare & Medicaid Services publicizes comparative performance data on Hospital Compare, a website maintained to support consumer decision making. Given the agency’s goal, this study investigates relationship between public reporting and hospital choices of hip replacement patients in Texas. Estimating individual-level valuations provider characteristics allowing heterogeneity across patients, we find selections hospitals’ displayed vary together time. Comparing...
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at glance that was extracted from about 200 leading journals. To access of an article which published elsewhere, please select “Full Text” option. The original trackable via the “References”
Abstract. The performance of a new chemical ionization reaction time-of-flight mass spectrometer (CIR-TOF-MS) utilising the environment chamber SAPHIR (Simulation Atmospheric Photochemistry In large Reaction Chamber – Forschungzentrum Jülich, Germany) is described. work took place as part ACCENT (Atmospheric Composition and Change European NeTwork for excellence) supported oxygenated volatile organic compound (OVOC) measurement intercomparison during January 2005. experiment entailed 14...
To ensure that Alcatel-Lucent solutions deliver the end-to-end service availability and quality expected by providers, new capabilities are required to model, measure, evaluate robustness effectiveness of over their lifecycles. This paper describes implementation a proactive support platform meets needs above for network technologies services such as IP Multimedia Subsystem (IMS) Internet Protocol television (IPTV). Key innovations include model predicts across an entire solution, near-real...