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 21 for “"LNT"”.
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NOx Removal by LNT-SCR Dual-layer Catalysts
… technology. NOx is stored in a lean NOx trap (LNT) catalyst during fuel-lean mode and reduced to N2 during fuel-rich mode. First, we investigated the impact of ceria on NSR in an Pt/Ce LNT catalyst. The physisorbed oxygen over the ceria-containing LNT catalyst led to a spatio-temporal …
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Modeling and Simulation of Coupled LNT – SCR Catalytic System under Anaerobic and Aerobic Operating Conditions
… the required precious metal loading in the LNT while keeping the NOx emission below a specified level. We present a mathematical model of this system using hydrogen as the reductant. Simulations are used to determine the influence of the architecture of the LNT-SCR bricks, non-uniform …
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Applied and Fundamental Studies of LNT-SCR Dual-layer Monolithic Catalysts for Lean NOx Emission Control
… storage (NSR, also referred to as lean NOx trap (LNT)) and selective catalytic reduction (SCR) technologies. This dissertation conducts applied and fundamental studies of coupled LNT-SCR dual-layer catalysts with the aim of expanding the operating temperature window of a conventional NSR system at …
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Unison, workplace learning and enhancing learning network theory : a case study
… data analysis is the Learning Network Theory (LNT) (Poell et al 2000). The LNT is one theory which has been put forward to describe organisational learning in the literature and uses the actors, structures and processes to interpret and describe how learning is organised. <br></br><br></br>The …
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Shawnee National Forest Rock Climbing and Frontcountry Recreation: Leave No Trace, Awareness, Attitudes and Behaviors
… of, and attitudes towards, Leave No Trace (LNT), as well as visitor perceptions of effectiveness and difficulty to perform minimum impact practices, on the intentions of visitors to perform future minimum impact behaviors. A survey instrument was deployed at ten different recreation sites on …
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Many-Body Effects in the Thermodynamic Properties of Fermi Liquids and the Electron-Phonon System and in the Excitation Spectrum of Liquid Helium-4
… ('3)He as an example, I show that the T('3)lnT corrections due to spin fluctuations account for the finite temperature corrections to the leading term in the specific heat. I also calculate and compare the statistical and the dynamical quasiparticle spectra and show that differences between …
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Uniform L¹ behavior for the solution of a volterra equation with a parameter
… for (F). For (F) to hold, it is necessary that (-lnt)a(τ)∈L¹(0,1) and lim sup <sub>τ→∞</sub> (τθ(τ))²/φ(τ) <∞ where â(τ)=∫<sub>0</sub><sup>∞</sup>e<sup>-iτt</sup>a(t)dt=φ(τ)-iτθ(τ) (φ,θ both real). We obtain sufficient conditions for (F) to hold which involve φ and θ (See Theorem 7). Then we look …
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An evaluation of theories concerning the health effects of low-dose radiation exposures
… here: supra-linearity, linear-no-threshold (LNT), threshold, and hormesis. The available evidence for and against these theories, which falls into the categories of either epidemiological studies, in vitro cell experiments, or in vivo animal experiments, includes studies which support each of …
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Heavy-duty diesel vehicle Nox̳ aftertreatment in 2010 : the infrastructure and compliance challenges of urea-SCR
… reduction (urea-SCR) or lean NOx traps (LNT) are the better NOx aftertreatment approach for meeting this new standard. And, if urea-SCR is indeed the preferred option, how can its compliance and infrastructure challenges be overcome during the relatively short window of time between now …
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Entwicklung eines Lipoprotein-Impfstoffes aus Pflanzen : Produktion des rekombinanten 'outer surface protein A' (OspA) von Borrelia burgdorferi in Tabakchloroplasten
… unter Mitwirkung dreier Enzyme (Lgt, Lsp und Lnt) am N-Terminus mit einer Pam3Cys-Struktur versehen und die N-terminale Signalsequenz abgespalten. In dieser Arbeit konnten nach der Etablierung eines Expressionssystems mehrere unabhängige transplastome OspA-Tabakpflanzen generiert werden. Der …
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Investigation of accelerated ageing protocols applied to Lean NOx Trap catalysts
… a tri-metal (Pt-Pd-Rh) commercial Lean NOX Trap (LNT) catalyst. The investigation has been focused on the correlation between the real-world ageing and artificial or rapid-ageing procedures. Samples exposed to hydrothermal, vehicle and dynamometer ageing have been fully characterized, and their …
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Addressing the risks of diagnostic radiology : what should be done about the increasing use of computed tomography in the United States
… models, primarily the linear no-threshold (LNT) model. Epidemiological evidence from atomic bomb survivors provides some understanding of the risk of low doses of radiation, but not on the order of doses from typical CT procedures. This paper explores the evidence of the risk of low doses of …
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Metabolism of human milk oligosaccharides by infant-associated bifidobacteria
… elucidating the mechanisms and components of LNT, LNnT and LNB utilisation pathways in Bifidobacterium breve UCC2003. Using a combination of experimental approaches, the enzymatic machinery involved in the metabolism of LNT, LNnT and LNB is identified and characterised. Furthermore, the …
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CRISPR-based Control of Biosynthetic Pathways and Genetic Biosensors, Informed by a Quantitative Investigation of Metabolic Burden
… regulators. As part of the CRISPR circuit for LNT production, we develop a novel in vivo biosensor, based on a ligand-responsive scRNA switch, to report on production levels, and use it alongside traditional analysis to query a library of pathway expression variants. These varied …
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X-ray diffraction from point-like imperfection
… located in octahedral sites. For Nb implanted at LNT, these distortion centers are aligned equally along three mutually perpendicular directions to maintain cubic symmetry. Large biaxial residual strains are developed after a 5at% implantation of N into Nb and Mo. Radiation damage is present as …
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Performance simulation and control design for diesel engine NOx emission reduction technologies
… combustion ignition (SCI) and lean NOx trap (LNT). The concept of the stoichiometric compression ignition (SCI) engine was investigated for implementation in a turbocharged diesel engine through co-simulation. At first, an integrated environment for 1D engine modeling with control function was …
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Bystander Effects Due To Neutrons, And Low-Dose Hyper-Radiosensitivity To Gamma Rays In Human Cells Using Cytogenetics
… of considerable debate. Linear-no-threshold (LNT) models are widely used to estimate risks associated with low dose exposures. However, the low-dose hyper-radiosensitivity (HRS) phenomenon, in which cells are especially sensitive at low doses but then show increased radioresistance at higher …
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Enumerating Escherichia coli (E. coli) Concentrations and Evaluating Optical Brighteners as a Potential Indicator of Human Wastewater Contamination in La Nana Bayou, Banita Creek, and their tributaries, Nacogdoches, Texas
… at sites TB 1, LNB 3, BON 2, BON 3, and LNT 4. Forest (32.37 %) was the dominant land cover, followed by Grassland/Pasture and developed land. An estimated 16.8 million kilograms of sediment are generated annually in the La Nana Bayou watershed, with approximately 98% (16,440,015 kg) …
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Modeling the Future Space Debris Population and Orbital Capacity
… is able to simulate Lethal Non-Trackable (LNT) objects, which comprise the vast majority of the orbital population today. These lethal non-trackable object population will only grow as more payloads and debris are launched into orbit and increase the collision rate. The effect of these …
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Behaviors, Knowledge, And Education Of Leave No Trace Principles In The Red River Gorge Rock Climbing Community
<p>Rock Climbing is becoming a very popular and mainstream outdoor activity. With the growth in rock climbing comes an increase in the numbers of visitors that this sport attracts. The increase in visitor usage undoubtedly leads to an impact on the natural environment surrounding these rock …
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