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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 26 for “"HCHO"”.
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In Vitro Methanogenesis From Formaldehyde. Identification of Three Carbon-1 Intermediates of the Methanogenic Pathway
The biosynthesis of CH(,4) from HCHO and by cell-free extracts of Methanobacterium thermoautotrophicum strain (DELTA)H under H(,2) or N(,2) was investigated. Quantitative conversion of HCHO to CH(,4) was achieved under an atmosphere of H(,2) gas. Under a non-reductive atmosphere of N(,2), HCHO …
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Imaging of volcanic trace gases by Fabry-Perot interferometer correlation spectroscopy
… SO2, bromine monoxide (BrO), and formaldehyde (HCHO) is examined in a model study. A prototype of a one-pixel FPI instrument for HCHO is characterised and tested in the laboratory yielding a good agreement between the modelled and measured sensitivity for HCHO. The sensitivity (weighted mean …
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Characterization of Internal Formaldehyde Production within The Pandora Spectrometer Instrument
Formaldehyde (HCHO), plays an important role in atmospheric chemistry and is an indicator of atmospheric oxidation capacity and surface ozone photo chemistry. The Pandora Spectrometer Instruments are deployed within the NASA/ESA sponsored Pandonia Global Network designed for satellite validation of …
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Remote Sensing of the Lower Atmosphere: From Surface Concentration to Mixing Layer Height
… surface air quality monitoring. Formaldehyde (HCHO) concentration retrieved from the DOAS technique exhibits significant variation depending on the fitting parameters used. This systematic variation stems from different factors such as uncertainty in molecular absorption cross section …
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The Effects of Macronutrient and Energy Availability on Metabolic Responses to Exercise: Implications for Training Adaptation
… (PM-SS), under conditions of either high CHO (HCHO), or isocaloric low CHO but high fat (HFAT) availability in the post-exercise recovery period. Muscle glycogen was lower (P<0.05) at 3 (251 vs 301 mmol.kg-1dw) and 15 h (182 vs 312 mmol.kg-1dw) post afternoon exercise in HFAT compared to HCHO, …
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Quantitative Visualisierung der Gemischbildung, Verbrennung und Schadstoffbildung eines Dieselsprays in einer Hochtemperatur-Hochdruck-Zelle durch multiple mehrdimensionale Laserdiagnostik
… NO-, und Formaldehyd-Konzentration (HCHO) und der Konzentration von polyzyklischen aromatischen Kohlenwasserstoffen (PAH) in gezündeten und ungezündeten Dieselsprays ermöglichten. Bei diesen laseroptischen Verfahren handelte es sich um planare Rayleigh-Spektroskopie …
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A new route to polyhydric alcohols
… Catalyst Pentaerythritol The initial step, CH3OH HCHO + H2, will involve the use of Ag/SiO2 catalysts. This will be in the absence of O2, which differs from the current oxidative dehydrogenation process used to produce HCHO, i.e. a direct dehydrogenation. This step has been optimised by …
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Trace Gas-Induced Brine and Disordered Interfacial Layers on Ice
… and CWFT-CIMS techniques were also used to study HCHO and CH_3CHO in partial pressure and temperature conditions akin to polar snowpack interstitial space. Although these light aldehydes do not interact as strongly with the ice surface as does HNO_3, they were also found to induce surface …
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Studies of Aldehydes in an Atmosphere Simulation Chamber
… Spurengaseingaben (von Benzaldehyd, Toluol and HCHO) in die Kammer verglichen werden, die auf Basis der Probenmenge und fundamentaler Kammereigenschaften berechnet wurden. Auch hier war die Übereinstimmung zwischen der Messung und den Berechnungen gut (Maximalabweichung 19 %, R größer als 0.94). …
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Airborne Multi AXis DOAS instrument and measurements of two-dimensional tropospheric trace gas distributions
… of tropospheric trace gases (e.g. NO2 and HCHO) additional information about the mixing layer height and the aerosol extinction is essential. This information can be gained from either independent measurements or retrieved from the measurements themselves. For example based on the O4 …
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Investigating regional climate drivers, wildfire mitigation, and air quality responses.
… air quality downwind, focusing on formaldehyde (HCHO), a reactive atmospheric trace gas and recognized carcinogen. Leveraging ground-based and satellite remote sensing data and model simulations, we find that wildfire emissions drive pronounced HCHO enhancements during summer in Texas cities, …
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Imaging of bromine oxide and formaldehyde using Fabry-Perot interferometer correlation spectroscopy
… a prototype imaging instrument for formaldehyde (HCHO) and bromine oxide (BrO) based on Fabry-Perot interferometer correlation spectroscopy in the UV wavelength range is presented. The technique makes use of the periodic transmission spectrum of a Fabry-Perot-Interferometer and its correlation …
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Opposing effects of recirculated gases during cranking on cold start of diesel engines
… partial oxidation products such as formaldehyde (HCHO). HCs and HCHO have two opposing effects. HCs enhance the autoignition process, while the HCHO has an opposite effect. These opposing effects are being investigated by three different approaches. The first is experimentally in a multi-cylinder …
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Carboxylic acid and formaldehyde separation from aqueous solutions using ionic liquids
… to extract acetic acid (AcOH) or formaldehyde (HCHO) from aqueous solutions at atmosphere pressure. The ILs, mainly trihexyl(tetradecyl)phosphonium ([P6,6,6,14]+) carboxylate based ILs, were tested as a function of the anion chain length, which ranges from isobutyrate ([IB]-) to dodecanoate …
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Simulating the Effects of Hydroclimate Stress on BVOC-Chemistry-Climate Interactions in NASA GISS ModelE
… described along with validation of O3, PM2.5 and HCHO tropospheric columns compared to observations during drought periods. We found the isoprene drought stress parameterization reduced the normalized mean bias in tropospheric HCHO column, a proxy for isoprene emissions, by ~ 19.3% in the …
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A Better Tropospheric Aerosol Analysis and Forecast Using Data Assimilation and Coupled Modeling
… estimated by using tropospheric NO2 and total HCHO columns from OMI. The inversion suggested 2.33 – 2.84 times higher NOx over the CONUS and 0.28 – 0.81 times fewer NMVOC emissions over the southeastern U.S. We found major metropolitan areas shifted toward NOx-limited conditions. However, …
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Investigations in to the physiological and metabolic demands of elite rugby players: understanding how best to fuel the athlete
… Rugby League players following either a 6g·kg (HCHO) or 3g·kg (LCHO) CHO diet for 36-hours. Muscle biopsy and blood was collected, alongside monitoring internal and external load through GPS and heart rate. Mean distance covered was 93.7 ± 12.4 and 89.4 ± 9.8 m·min-1 in the first, and 85.3 ± …
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Determining the temporal and spatial variations of pollutants in Toronto
… also display the highest and lowest NO2 and HCHO levels over Pearson Airport and Lake Ontario.
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Effects of Pre-exercise Muscle Glycogen Status on Muscle Phosphagens, Sarcoplasmic Reticulum Function, and Performance During Intermittent High Intensity Exercise
… of diet on muscle glycogen levels: 609 ± 38 HCHO vs. 390 ± 42 mmol/kgdw L-CHO at biopsy 1, 383 ± 29 vs. 252 ± 28 mmol/kgdw at biopsy 2, and 346 ± 29 vs. 196 ± 18 mmol/kgdw at biopsy 3 (p<0.01). Similar decreases in muscle glycogen (45%), creatine phosphate (CP) (35%), and sarcoplasmic …
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