Global ETD Search
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 25 for “"UCM"”.
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Qualitative and quantitative assessment of UCM in PM2.5 of Bakersfield, CA.
… presence of unresolved complex mixture (UCM) was observed in the collected PM ₂.₅ . To quantify the overlapping UCM peaks, a method was developed for the deconvolution (peak separation) of the UCM. This enabled unique quantification of each UCM peak. The developed method was tested on …
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Universal Communication model and evaluation with the Elderly Society
… model ¿Universal Communication Model¿ (UCM) for the unified application of these items is developed and investigated. The future society will merely be 60+ and lowered physical abilities for communication need to be compensated. Two hypotheses that represent challenges of the UCM are …
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Facilitating the College Transition of Undocumented and Citizen Students of Mixed-Status Families: A Mixed Methods Study of the Role of Public High School Counselors as Social Capital Agents
… and citizen students from mixed-status families (UCM students) encounter numerous obstacles when transitioning to college due to their citizenship status or that of an immediate family member. Due to the current anti-immigrant political environment, these college-going obstacles have been …
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Biodegradation, water solubility and characterisation studies of unresolved complex mixtures (UCMs) of aromatic hydrocarbons
… leaving an unresolved complex mixture (UCM) comprising the more environmentally persistent components. Aromatic UCMs have been reported in a wide variety of environmental matrices. Recent studies indicate such material, particularly monoaromatic hydrocarbons, is sufficiently bioavailable …
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Characterisation of unresolved complex mixtures of hydrocarbons
… of model aliphatic and aromatic hydrocarbon UCMs from lubricating oils followed by conventional methods of analysis provided little compositional detail. Thus CC and CC-electron impact mass spectrometry (GC-EIMS) was limited to an estimate of carbon number ranges and to the identification of …
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Enhanced use case map analysis and transformation tooling
The Use Case Map (UCM) notation enables the use of graphical scenarios to model greybox views of a system's operational requirements and behaviour. The scenario traversal mechanism is the most popular UCM analysis technique as it allows modellers to test, explain, and transform UCM models. However, …
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Characterisation of unresolved complex mixtures of hydrocarbons by degradative methods
Unresolved Complex Mixtures (UCMs) of hydrocarbons are found in crude and refined oils and in water, sediments and biota polluted with oils. The concentrations of UCMs in oils are significant (e. g. >65% of the aliphatic hydrocarbons in fresh Kuwait crude) and it is perhaps surprising that …
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Unresolved complex mixtures of aromatic hydrocarbons in the marine environment : toxicity, solubility and photodegradation studies
Unresolved complex mixtures (UCMs) of aromatic hydrocarbons have been found in a wide range of environmental matrices at high concentrations. However, limited consideration has been given to the potential detrimental effects of the accumulation of these compounds in the marine environment. In …
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Studies of the synthesis, environmental occurrence and toxicity of unresolved complex mixtures (UCMs) of hydrocarbons
… of unresolved complex mixtures of hydrocarbons (UCMs) in the aliphatic fraction of marine sediments and organisms from areas impacted by petroleum hydrocarbons is well documented and widely accepted as an indication of fossil fuel contamination. In contrast, the presence of an aromatic UCM is …
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Characterisation and environmental effects of unresolved complex mixtures of hydrocarbons
… referred to as the unresolved complex mixture (UCM). UCMs are thought to result from the co-elution of complex mixtures of hydrocarbons with similar chemical properties and become more obvious as resolved components are removed by processes such as weathering and refining. Consequently UCMs are …
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Environmental organic geochemistry of sediments from Wadi Gaza and investigation of bioremediation of petroleum derivatives and herbicides by cyanobacterial mats under different experimental conditions
… and phytane, an unresolved complex mixture (UCM), the UCM/n-alcane ratio, the low carbon preference index (CPI ca. 1), steranes and hopanes and the presence of the phenanthrene, dibenzothiophene and their alkylated homologues confirms the input of crude oil and petroleum derivatives. Wadi …
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The Temporal and Spatial Distribution of Hydrocarbons in Atmospheric Deposition From Stations Surrounding Lower Chesapeake Bay
… (PAH), and the unresolved complex mixture (UCM). The PAH and the UCM were an indication of significant anthropogenic inputs while the odd/even distribution of the n-alkanes was an indication of biogenic sources. These findings indicated seasonal trends of highest biogenic hydrocarbon inputs …
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Neural response variability in the navigational system of the brain
… for spike counts the Universal Count Model (UCM), and for spike trains the Nonparametric Non-renewal (NPNR) process. By leveraging Bayesian machine learning, we obtain a data-efficient yet flexible model for neural activity that can flexibly model neural response statistics beyond the …
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Higher education student services : a qualitative study of two mid-size universities' direct exchange programs
… program between University of Central Missouri (UCM) and Orebro University. The researcher explored the impact of student services staff assistance on students participating in this direct exchange. The conceptual framework of this research study included Schlossberg's Transition Theory (1984), …
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Characterisation of waxy gas-condensates by high temperature capillary gas chromatography and oxidative degradation
… (so called unresolved complex mixtures UCMs) are also studied. UCMs may account for a large portion of the hydrocarbons in many fossil fuels yet very little is known about their composition. Knowledge of these compounds may be important in enhancing the prediction of phase behaviour. …
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Molecular Characterisation of Fluidised Catalytic Cracker Feedstocks using Ruthenium Tetroxide Oxidation: a Study of Model Hydrocarbons
… compounds termed an Unresolved Complex Mixture (UCM) of hydrocarbons. Conventional instrumental techniques alone are unable to elucidate the composition of UCMs, they are simply too complex. Oxidative degradation of UCMs has already been used with some success to selectively oxidise aliphatic and …
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The constitution of the field of higher education institutions in Mozambique
… and the second was the Catholic University (UCM), a religious institution, both established in 1995. ISPU and UCM were followed in 1998 by Higher Institute of Science and Technology of Mozambique (ISCTEM) , a technological institute, and by the Mussa Bin Bique University (UMBB), an Islamic …
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Well-posedness results for a class of complex flow problems in the high Weissenberg number limit
… we investigate the upper convected Maxwell(UCM) model for complex fluids, or non-Newtonian fluids, in the high Weissenberg number limit. This is analogous to the Newtonian fluids in the high Reynolds number limit. We present two well-posedness results. The first result is on an …
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Thermal Analysis and Cation Doping of Nafion Membranes
… membrane</p> <p>(CCM), and uncatalyzed membrane (UCM) materials were examined to aid in single cell</p> <p>post-test characterization where separation of materials is difficult and may alter results.</p> <p>Through thermal analysis, FTIR, and vapor sorption the study shows how</p> <p>membranes of …
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Speculation and hedging with virtuals
… a combination of unobserved component models (UCM) and a set of regression variables. The DA Price and RT Price processes are replicated with GARCH based regression models. The regressor variables include principal components of different weather variables to capture the weather variation …
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