Дисертації з теми "Natural Hazards not elsewhere classified"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-17 дисертацій для дослідження на тему "Natural Hazards not elsewhere classified".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Jones, Christopher Charles Rawlinson. "A study of novel computing methods for solving large electromagnetic hazards problems." Thesis, University of Central Lancashire, 2002. http://clok.uclan.ac.uk/18842/.
Повний текст джерелаGrahn, Tonje. "A Nordic Perspective on Data Availability for Quantification of Losses due to Natural Hazards." Licentiate thesis, Karlstads universitet, Institutionen för miljö- och livsvetenskaper, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-41138.
Повний текст джерелаNaturolyckor orsakar enorma mängder skador över hela världen varje år. Under åren 1994-2013 förlorade mer än 1,35 miljoner människor sina liv och mer än 116 miljoner hem skadades. Förståelse av risk för naturolyckor innebär kunskap om sårbarhet, kapacitet, exponering av personer och tillgångar, hot och miljö. Kvantitativa skadebedömningar, som är en viktig del av riskbedömningar, omfattas av stora utmaningar som grundar sig i hotens mångfaldighet och det faktum att en naturolycka kan påverka ett samhälle negativt på många olika sätt. Det övergripande syftet med avhandlingen är att analysera förhållandet mellan naturkatastrofer och potentiellt påföljande skador i syfte att förbättra förutsättningarna för kvantitativa riskbedömningar i framtiden. Avhandlingen koncentrerar sig på två typer av naturolyckor med specifika konsekvenser, 1) skador på byggnader till följd av sjö-översvämningar, och 2) förlust av liv orsakat av lerskred. Flera orsakssamband mellan riskfaktorer och omfattning av skador har identifierats. Sjöarnas vattennivåer ökade sannolikheten att drabbas av strukturell byggnadsskada, samtidigt som privat initierade åtgärder minskande sannolikheten.. När avstånd mellan sjö och byggnad ökade minskade omfattningen av översvämningsskador, men ökade ju längre sjööversvämningen varade. Hus byggda före 1940 fick mindre skador jämfört med andra hus. Andelen dödsfall i samband med skred i kvicklera ökade när antal människor i den exponerade befolkningen ökade. Den största utmaningen i att förbättra dagens kvantitativa skadebedömningar är den rådande databristen vad gäller förluster och tillhörande riskfaktorer. Denna brist beror på otillgänglig skadedata, bristande detaljnivå på skadedata och tillhörande risk faktorer, och att uppgifterna sällan samlas systematiskt i syfte att studera kausalitet.
The overall aim of the thesis is to analyze the relationship between climate-related natural hazards and subsequent damage for the purpose of improving the prerequisite for quantitative risk assessments in the future. The thesis concentrates on two specific types of hazards with specific types of consequences, 1) damage to buildings caused by lake floods, and 2) loss of lives caused by quick clay landslides. Several causal relationships were established between risk factors and the extent of damages. Lake water levels increased the probability of structural building damage. Private damage reducing measures decreased the probability of structural building damage. Extent of damage decreased with distance to waterfront but increased with longer flood duration while prewar houses suffered lower flood damage compared to others. Concerning landslides, the number of fatalities increased when the number of humans in the exposed population increased. The main challenges to further damage estimation are data scarcity, insufficient detail level and the fact that the data are rarely systematically collected for scientific purposes.
Pool, Ursula. "The impact of water and anthropogenic objects on implicit evaluations of natural scenes : a restorative environments perspective." Thesis, University of Central Lancashire, 2017. http://clok.uclan.ac.uk/17669/.
Повний текст джерелаPedder-Smith, Rachel. "The glow of significance : narrating stories using natural history specimens." Thesis, Royal College of Art, 2011. http://researchonline.rca.ac.uk/430/.
Повний текст джерелаCaon, Maurizio. "Context-aware gestural interaction in the smart environments of the ubiquitous computing era." Thesis, University of Bedfordshire, 2014. http://hdl.handle.net/10547/344619.
Повний текст джерела(7026707), Siddharth Saksena. "Integrated Flood Modeling for Improved Understanding of River-Floodplain Hydrodynamics: Moving beyond Traditional Flood Mapping." Thesis, 2019.
Знайти повний текст джерела(7484483), Soohyun Yang. "COUPLED ENGINEERED AND NATURAL DRAINAGE NETWORKS: DATA-MODEL SYNTHESIS IN URBANIZED RIVER BASINS." Thesis, 2019.
Знайти повний текст джерелаIn urbanized river basins, sanitary wastewater and urban runoff (non-sanitary water) from urban agglomerations drain to complex engineered networks, are treated at centralized wastewater treatment plants (WWTPs) and discharged to river networks. Discharge from multiple WWTPs distributed in urbanized river basins contributes to impairments of river water-quality and aquatic ecosystem integrity. The size and location of WWTPs are determined by spatial patterns of population in urban agglomerations within a river basin. Economic and engineering constraints determine the combination of wastewater treatment technologies used to meet required environmental regulatory standards for treated wastewater discharged to river networks. Thus, it is necessary to understand the natural-human-engineered networks as coupled systems, to characterize their interrelations, and to understand emergent spatiotemporal patterns and scaling of geochemical and ecological responses.
My PhD research involved data-model synthesis, using publicly available data and application of well-established network analysis/modeling synthesis approaches. I present the scope and specific subjects of my PhD project by employing the Drivers-Pressures-Status-Impacts-Responses (DPSIR) framework. The defined research scope is organized as three main themes: (1) River network and urban drainage networks (Foundation-Pathway of Pressures); (2) River network, human population, and WWTPs (Foundation-Drivers-Pathway of Pressures); and (3) Nutrient loads and their impacts at reach- and basin-scales (Pressures-Impacts).
Three inter-related research topics are: (1) the similarities and differences in scaling and topology of engineered urban drainage networks (UDNs) in two cities, and UDN evolution over decades; (2) the scaling and spatial organization of three attributes: human population (POP), population equivalents (PE; the aggregated population served by each WWTP), and the number/sizes of WWTPs using geo-referenced data for WWTPs in three large urbanized basins in Germany; and (3) the scaling of nutrient loads (P and N) discharged from ~845 WWTPs (five class-sizes) in urbanized Weser River basin in Germany, and likely water-quality impacts from point- and diffuse- nutrient sources.
I investigate the UDN scaling using two power-law scaling characteristics widely employed for river networks: (1) Hack’s law (length-area power-law relationship), and (2) exceedance probability distribution of upstream contributing area. For the smallest UDNs, length-area scales linearly, but power-law scaling emerges as the UDNs grow. While area-exceedance plots for river networks are abruptly truncated, those for UDNs display exponential tempering. The tempering parameter decreases as the UDNs grow, implying that the distribution evolves in time to resemble those for river networks. However, the power-law exponent for mature UDNs tends to be larger than the range reported for river networks. Differences in generative processes and engineering design constraints contribute to observed differences in the evolution of UDNs and river networks, including subnet heterogeneity and non-random branching.
In this study, I also examine the spatial patterns of POP, PE, and WWTPs from two perspectives by employing fractal river networks as structural platforms: spatial hierarchy (stream order) and patterns along longitudinal flow paths (width function). I propose three dimensionless scaling indices to quantify: (1) human settlement preferences by stream order, (2) non-sanitary flow contribution to total wastewater treated at WWTPs, and (3) degree of centralization in WWTPs locations. I select as case studies three large urbanized river basins (Weser, Elbe, and Rhine), home to about 70% of the population in Germany. Across the three river basins, the study shows scale-invariant distributions for each of the three attributes with stream order, quantified using extended Horton scaling ratios; a weak downstream clustering of POP in the three basins. Variations in PE clustering among different class-sizes of WWTPs reflect the size, number, and locations of urban agglomerations in these catchments.
WWTP effluents have impacts on hydrologic attributes and water quality of receiving river bodies at the reach- and basin-scales. I analyze the adverse impacts of WWTP discharges for the Weser River basin (Germany), at two steady river discharge conditions (median flow; low-flow). This study shows that significant variability in treated wastewater discharge within and among different five class-sizes WWTPs, and variability of river discharge within the stream order <3, contribute to large variations in capacity to dilute WWTP nutrient loads. For the median flow, reach-scale water quality impairment assessed by nutrient concentration is likely at 136 (~16%) locations for P and 15 locations (~2%) for N. About 90% of the impaired locations are the stream order < 3. At basin-scale analysis, considering in stream uptake resulted 225 (~27%) P-impaired streams, which was ~5% reduction from considering only dilution. This result suggests the dominant role of dilution in the Weser River basin. Under the low flow conditions, water quality impaired locations are likely double than the median flow status for the analyses. This study for the Weser River basin reveals that the role of in-stream uptake diminishes along the flow paths, while dilution in larger streams (4≤ stream order ≤7) minimizes the impact of WWTP loads.
Furthermore, I investigate eutrophication risk from spatially heterogeneous diffuse- and point-source P loads in the Weser River basin, using the basin-scale network model with in-stream losses (nutrient uptake).Considering long-term shifts in P loads for three representative periods, my analysis shows that P loads from diffuse-sources, mainly from agricultural areas, played a dominant role in contributing to eutrophication risk since 2000s, because of ~87% reduction of point-source P loads compared to 1980s through the implementation of the EU WFD. Nevertheless, point-sources discharged to smaller streams (stream order < 3) pose amplification effects on water quality impairment, consistent with the reach-scale analyses only for WWTPs effluents. Comparing to the long-term water quality monitoring data, I demonstrate that point-sources loads are the primary contributors for eutrophication in smaller streams, whereas diffuse-source loads mainly from agricultural areas address eutrophication in larger streams. The results are reflective of spatial patterns of WWTPs and land cover in the Weser River basin.
Through data-model synthesis, I identify the characteristics of the coupled natural (rivers) – humans – engineered (urban drainage infrastructure) systems (CNHES), inspired by analogy, coexistence, and causality across the coupled networks in urbanized river basins. The quantitative measures and the basin-scale network model presented in my PhD project could extend to other large urbanized basins for better understanding the spatial distribution patterns of the CNHES and the resultant impacts on river water-quality impairment.
(6594389), Mahsa Modiri-Gharehveran. "INDIRECT PHOTOCHEMICAL FORMATION OF COS AND CS2 IN NATURAL WATERS: KINETICS AND REACTION MECHANISMS." Thesis, 2019.
Знайти повний текст джерелаIn the first part of this thesis (chapters 2 and 3), nine natural waters ranging in salinity were spiked with various organic sulfur precursors (e.g. cysteine, cystine, dimethylsulfide (DMS) and methionine) exposed to simulated sunlight over varying exposures. Other water quality conditions including the presence of O2, CO and temperature were also varied. Results indicated that COS and CS2 formation increased up to 11× and 4×, respectively, after 12 h of sunlight while diurnal cycling exhibited varied effects. COS and CS2 formation were also strongly affected by the DOC concentration, organic sulfur precursor type, O2 concentration, and temperature while salinity differences and CO addition did not play a significant role.
To then specifically evaluate the role of DOM in cleaner matrices, COS and CS2 formation was examined in synthetic waters (see chapters 4 and 5). In this case, synthetic waters were spiked with different types of DOM isolates ranging from freshwater to ocean water along with either cysteine or DMS and exposed to simulated sunlight for up to 4 h. Surprisingly, CS2 was not formed under any of the tested conditions, indicating that other water quality constituents, aside from DOM, were responsible for its formation. However, COS formation was observed. Interestingly, COS formation with cysteine was fairly similar for all DOM types, but increasing DOM concentration actually decreased formation. This is likely due to the dual role of DOM on simultaneously forming and quenching the reactive intermediates (RIs). Additional experiments with quenching agents to RIs (e.g. 3DOM* and ·OH) further indicated that ·OH was not involved in COS formation with cysteine but 3DOM* was involved. This result differed with DMS in that ·OH and 3DOM* were both found to be involved. In addition, treating DOM isolates with sodium borohydride (NaBH4) to reduce ketone/aldehydes to their corresponding alcohols increased COS formation, which implied that the RIs formed by these functional groups in DOM were not involved. The alcohols formed by this process were not likely to act as quenching agents since they have been shown to low in reactivity. Since ketones are known to form high-energy-triplet-states of DOM while quinones are known to form low-energy-triplet-states of DOM, removing ketones from the system further supported the role of low-energy-triplet-states on COS formation. This was initially hypothesized by findings from the testes on DOM types. In the end there are several major research contributions from this thesis. First, cysteine and DMS have different mechanisms for forming COS. Second, adding O2 decreased COS formation, but it did not stop it completely, which suggests that further research is required to evaluate the role of RI in the presence of O2. Lastly, considering the low formation yields of COS and CS2 formation from the organic sulfur precursors tested in this study, it is believed that some other organic sulfur precursors are missing which are likely to generate these compounds to higher levels and this needs to be investigated in future research.
(5929508), Travis J. Beckett. "Selection and Characterization of Previously Plant-Variety-Protected Commercial Maize Inbreds." Thesis, 2019.
Знайти повний текст джерела(6624152), Simran Kaur. "Interfacial Rheological Properties of Protein Emulsifiers, Development of Water Soluble b-Carotene Powder and Food Science Engagement (Emulsifier Exploration)." Thesis, 2019.
Знайти повний текст джерелаInterfacial rheology describes the functional relationship between the deformation of an interface, the stresses exerted in and on it, and the resulting flows in the adjacent fluid phases. These interfacial properties are purported to influence emulsion stability. Protein emulsifiers tend to adsorb to the interface of immiscible phases, reduce interfacial tension as well as generate repulsive interactions. A magnetic interfacial shear rheometer was used to characterize the surface pressure-area isotherms as well as interfacial rheological properties of two proteins- sodium caseinate and b-lactoglobulin. Then, sodium caseinate was used as a carrier for b-carotene encapsulation.
b-carotene is a carotenoid that exhibits pro-vitamin A activity, antioxidant capacity and is widely used as a food colorant. It is however, highly hydrophobic and sensitive to heat, oxygen and light exposure. Thus b-carotene as food ingredient is mainly available as purified crystals or as oil-in-water emulsions. In this study, b-carotene stability, and solubility in water for application as a natural colorant was improved by preparation of a sodium caseinate/ b-carotene powder using high pressure homogenization, solvent evaporation and spray drying. The powders thus prepared showed good solubility in water and yielded an orange coloration from b-carotene. The effect of medium chain triglyceride concentration (1%, 10%) and incorporation of a natural antioxidant (Duralox, Kalsec) on powder stability was studied as a function of storage time and temperature.b-carotene stability was reduced at higher storage temperature (4oC> 21oC> 50oC) over 60 days and followed first order degradation kinetics at all temperatures. Incorporation of natural antioxidant improved b-carotene stability and resulted in a second first order degradation period at 50oC. As b-carotene content decreased, Hunter Lab color values denoting lightness increased, while those for redness and yellowness of the powder decreased. This sodium caseinate based b-carotene powder could be used as a food ingredient to deliver natural b-carotene to primarily aqueous food formulations.
In the last part of this work, an engagement workshop was developed as a means to educate young consumers about the function of emulsifiers in foods. Food additives are important for food product development, however to consumers, a discord between their objective purpose and subjective quality has led to confusion. Food emulsifiers, in particular, are associated with lower healthiness perception due to their unfamiliar names. In collaboration with the 4H Academy at Purdue, a workshop high school student was conducted to develop an increased understanding of emulsions and emulsifiers. A survey was conducted with the participants who self-evaluated their gain in knowledge and tendency to perform certain behaviors with regards to food ingredient labels. The participants reported a gain in knowledge in response to four key questions on emulsions and emulsifiers, as well as an increased likelihood to read ingredients on a food label and look up information on unfamiliar ingredients.
(6620390), Sang-Won Shim. "Designing Natural Haptic Interfaces and Signals." Thesis, 2019.
Знайти повний текст джерелаAfter the initial prototyping efforts, a 2-by-2 vibrotactile display, the palmScape, was conceived and developed. Custom-designed stimulation patterns based on natural phenomena that feel calm and pleasant were designed and implemented with the palmScape. We use text labels to set the context for the vibrotactile icons that attempt to capture and expresses natural metaphors through variations in signal amplitude, frequency, duration, rhythm, modulation, spatial extent, as well as slow movements. Fourteen participants evaluated twenty vibrotactile icons by rating the perceived valence and arousal levels. The twenty stimuli included sixteen custom-designed vibrotactile icons from this thesis research and four reference patterns from two published studies. The results show that our custom-designed patterns were rated at higher valence levels than the corresponding reference signals at similar arousal ratings. Five of the sixteen vibrotactile icons from this research occupied the fourth quadrant of the valence-arousal space that corresponds to calm and pleasant signals. These findings support the validity of the palmScape display and our signal design approach for achieving a calm and pleasant experience and the possibility of reaching a broader range of expressiveness with vibrotactile signals.
Future studies will continue with the design of signals that can express a broader range of metaphors and emotions through the palmScape, and build an emotional evaluation database that can be combined with other modalities. Our work can be further expanded to support an immersive experience with naturalistic-feeling vibrotactile effects and broaden the expressiveness of human-computer interfaces in media consumption, gaming, and other communicative application domains.
(9021866), Emma C. Brace. "Investigation of High-Oleic Soybean Oil as an Extraction Solvent to Remove Hydrogen Sulfide from Natural Gas." Thesis, 2020.
Знайти повний текст джерела(8775833), Karl Blodgett. "Ultraviolet and Infrared Spectroscopy of Synthetic Peptides and Natural Products in the Gas Phase." Thesis, 2020.
Знайти повний текст джерелаThe hydrogen bond is one of nature’s ubiquitous molecular interactions. Its role ranges from that of a static provider of structural integrity in proteins to that of a dynamic coordinate, along which excited state deactivation in sunscreen molecules is achieved. The work in this dissertation employs a supersonic expansion to collisionally cool peptide oligomers and a sunscreen chromophore to the zero-point vibrational level of their low lying conformational minima. These species are interrogated using high-resolution, conformer-specific ultraviolet and infrared laser spectroscopic techniques with the aim of elucidating their intrinsic conformational preferences, hydrogen bonding networks, and excited state deactivation mechanisms.
Synthetic foldamers are oligomers composed of non-natural building blocks, such as b- and g-amino acids. Incorporation of such residues into a peptide backbone results in secondary and tertiary structures that are distinct from those found in nature. Herein, the folding propensity of a series of mixed a/b and pure b-peptides is presented. In each case, both the left- and right-handed emergence of mixed-helical secondary structures, the 11/9- and the 12/10-helix, are observed. Next, the intrinsic conformational preferences of a series of increasingly complex asparagine-containing peptides are characterized. Asparagine, with its flexible carboxamide sidechain, is omnipresent within the prion forming domain of the misfolded proteins associated with several neurodegenerative diseases. Asparagine’s propensity for b-turn structures is discussed and compared with that of analogous peptide sequences found in nature.
Methyl anthranilate is a natural product that contains an identical electronic chromophore to the sunscreen agent, meradimate. The excited state deactivation mechanism of methyl anthranilate and its water complex is determined with extensive ultraviolet spectroscopic characterization, and is discussed within the broader context of its role as a sunscreen agent. Vibronic analysis coupled with computational results indicate extensive heavy-atom rearrangement leading to hydrogen atom dislocation, rather than full transfer, on the S1 surface. This phenomenon is further characterized with infrared spectroscopy and theoretical modeling, in which the NH stretch is adiabatically separated from other internal coordinates. Extensive dilution of the dislocated NH stretch oscillator strength over many transitions and ~1,300 cm-1 is predicted. These results may have implications for similar molecules, such as salicylic acid and its derivatives.
(9759374), Satyabrata Parida. "Neural representations of natural speech in a chinchilla model of noise-induced hearing loss." Thesis, 2020.
Знайти повний текст джерела(6564809), Elisabeth Krueger. "Dynamics of Coupled Natural-Human-Engineered Systems: An Urban Water Perspective on the Sustainable Management of Security and Resilience." Thesis, 2019.
Знайти повний текст джерела(9437825), Oluwatobi O. Busari. "DESIGN AND ANALYSIS OF A STAGED COMBUSTOR FEATURING A PREMIXED TRANSVERSE REACTING FUEL JET INJECTED INTO A VITIATED CONFINED CROSSFLOW." Thesis, 2021.
Знайти повний текст джерелаprovide handles with which we may describe them. Just as simultaneous experimental tech-
niques provide complementary descriptions of flame behavior, one might assume that no
analysis technique for any kind of flame measurement would cover the full description of
the flame. To this end, the search continues for complementary descriptions of engineering
flames that capture enough information for the engine designer to make informed decisions.
The kinds of flames I have encountered are high pressure transverse jet flames issuing into a
vitiated crossflow which is itself generated from combustion of a gaseous fuel and oxidizer.
Summarizing the behavior of these flames has required my understanding of experimen-
tal techniques such as Planar Laser Induced Fluorescence of a reaction intermediate -OH,
Particle Image Velocimetry of a passive tracer in the flame and OH * chemiluminescence of
another reaction intermediate. The analysis tools applied to these measurements must reveal
as much information as is laden in these measurements.
In this work I have also used wavelet optical flow to track flow features in the visualization
of combustion intermediates using OH * chemiluminescence. There are many limitations to
the application of this technique to engineering flames especially due to the interpretation
of the data as a 2-D motion field in 3-D world. The interpretation of such motion fields
as generated by scalar fields is one subject matter discussed in this dissertation. Some
inferences from the topology of the ensuing velocity field has provided insight to the behavior
of reacting turbulent flows which appear attached to an injector in the mean field. It gives
some understanding to the robustness of the attachment mechanism when such flames are
located near walls.
(9576107), Ananya B. Sheth. "PATHWAYS TO ENTERPRISE RESILIENCE." Thesis, 2021.
Знайти повний текст джерелаResilience is studied as a systemic property in several disciplines such as engineering, psychology, systems biology, and ecological sciences. Yet, the system view on resilience is not pervasive in management science. This dissertation is on Enterprise Resilience, which is an emerging topic within the fields of organization and management science. Corporate enterprises are viewed as type 1 complex adaptive systems (CAS) operating within an external business environment. Thus, perturbations occurring in the environment affect enterprises, whose resilience then depends on their adaptive response to them. Therefore, the focus is on system perturbances and on investigating drivers of the enterprises’ adaptive response. As a result, enterprise resilience is more granularly defined as an enterprise’s ability to continually remain valuable to stakeholders by simultaneously managing short-term shocks and long-term stressors. This re-definition brings forth an actionable pathway to enterprise resilience- the pursuit of improved management of the enterprise’s risk and growth management functions.
Two challenging issues plaguing the risk and growth functions are the lack of a comprehensive understanding of risks (especially of unknowns) and their inter-connections, and a weak link between risk management and the enterprise’s growth strategy intended to continually and increasingly generate value. This work addresses both issues via the development of an enterprise-agnostic comprehensive risk typology, and by building a conceptual link between risk and growth strategy through the business model construct and its use in the study of repeatable patterns of innovation. Therefore, this work develops one pathway toward enterprise resilience i.e., via improved risk management and systematic growth management. Furthermore, it advances knowledge by bridging the theoretical conceptualization of an enterprise as a CAS1 into actionable methods for practice in the form of risk management tools and systematic innovation frameworks that aid the enterprise’s adaptive response.
The interdisciplinary dissertation develops hypotheses and employs appropriate qualitative and quantitative methods to test them. Overall, a theory building process is undertaken using the constructionist school of thought and using methods based in inductive logic such as the scholarship of integration, thematic analysis, and case studies. Additionally, to achieve wide and comprehensive coverage, data-driven quantitative methods using advanced computing such as data mining, machine learning, and natural language processing are employed.