Dissertations / Theses on the topic 'Point source analysis'
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Fulford, Ross Anthony. "Structure-borne sound power and source characterisation in multi-point-connected systems." Thesis, University of Liverpool, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284262.
Full textXu, Yang. "Performance Analysis of Point Source Model with Coincident Phase Centers in FDTD." Digital WPI, 2014. https://digitalcommons.wpi.edu/etd-theses/214.
Full textTowler, Jerry Alwynne. "Autonomous Aerial Localization of Radioactive Point Sources via Recursive Bayesian Estimation and Contour Analysis." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/43465.
Full textPerforming this autonomous analysis comprises five major steps: ingress from a base of operations to the danger zone, initial detection of radioactive material, measurement of the strength of radioactive emissions, analysis of the data to provide position and intensity estimates, and finally egress from the area of interest back to the launch site. In all five steps, time is of critical importance: faster responses promise potentially saved lives.
A time-optimal ingress and egress path planning method solves the first and last steps. Vehicle capabilities and instrument sensitivity inform the development of an efficient search path within the area of interest. Two algorithmsâ a grid-based recursive Bayesian estimator and a novel radiation contour analysis methodâ are presented to estimate the position of radioactive sources using simple gross gamma ray event count data from a nondirectional radiation detector. The latter procedure also correctly estimates the number of sources present and their intensities.
Ultimately, a complete unsupervised mission is developed, requiring minimal initial operator interaction, that provides accurate characterization of the radiation environment of an area of interest as quickly as reasonably possible.
Master of Science
Raine, Teresa Jeannette 1976. "Modeling and analysis of non-point source runoff and best management practice devices in Acton, MA." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/80167.
Full textIncludes bibliographical references (leaves 33-35).
by Teresa Jeannette Raine.
M.Eng.
Alagoz, Eda. "Kinetic Analysis Of Glucose-6-phosphate Branch Point In Saccharomyces Cerevisiae." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606556/index.pdf.
Full textonly ammonium sulfate, only yeast nitrogen base, ammonium sulfate and histidine, yeast nitrogen base and histidine. Histidine was added because its synthesis branches from pentose phosphate pathway. In order to analyse the effect of the different compositions of nitrogen sources on the physiology of the yeast, specific activities of hexokinase, phosphoglucose isomerase, glucose-6-phosphate dehydrogenase and 6-phosphogluconate dehydrogenase enzymes were measured in the crude extracts of the biomass samples taken in the late exponential phase of the cultures. Addition of histidine caused an increase in the specific activities of all the enzymes analysed in medium containing ammonium sulfate. The specific activity of hexokinase, phosphoglucose isomerase and glucose-6-phosphate dehydrogenase in medium containing yeast nitrogen base and histidine were higher than medium containing yeast nitrogen base. However, the specific activity of 6-phosphogluconate dehydrogenase decreased 3.1% in medium containing yeast nitrogen base and histidine medium with respect to medium with only yeast nitrogen base. The OD value and dry weight in the culture containing histidine aminoacid was higher than the cultures contaning only ammonium sulfate and only yeast nitrogen base. Also the period of the exponential phase was shorter in medium containing ammonium sulfate and histidine and yeast nitrogen base and histidine than medium only ammonium sulfate and only yeast nitrogen base.
Manglallan, Eduardo P. "Water quality baseline study and non-point source pollution analysis on Waikele Stream, West Loch Estuary, Oahu, Hawaii." Thesis, Monterey, California. Naval Postgraduate School, 1994. http://hdl.handle.net/10945/26334.
Full textTAKEDA, Kazuya, Takanori NISHINO, and Kenta NIWA. "Selective Listening Point Audio Based on Blind Signal Separation and Stereophonic Technology." Institute of Electronics, Information and Communication Engineers, 2009. http://hdl.handle.net/2237/15055.
Full textCziesch, Jarrett. "An Introduction to Identifying Nonpoint Sources of Water Pollution Using a Modified Land Use Conflict Analysis Identification Strategy (LUCIS) Model, Non-point Source Identification Strategy: NPSIS." The University of Arizona, 2015. http://hdl.handle.net/10150/576109.
Full textKoo, Bonjin. "A study on the filtration efficiency of micro particle pollutants from non-point source : focused on road runoff and CSOs." Thesis, Nice, 2014. http://www.theses.fr/2014NICE4092/document.
Full textThe impermeable area and the peak discharge volume have been consistently increasing due to widening of city development and renewal. Thus, distortion of water cycle has been serious problem compared to the past. When it comes to NPS pollution, lack of information on the load and characteristics of pollutants led to the insufficient reduction measures. The purpose of this study is to investigate the effectiveness of filters to control micro particles from non-point sources, especially from road runoff and Combined Sewer Overflows (CSOs). The study first examined the particle size and characteristics of NPS pollutants, and then analyzed the head loss, treatment efficiency and changes in particle size distribution before and after the treatment using device type facilities. The four most commonly used filters - Expanded Polypropylene (EPP), Expanded polystyrene (EPS), and Perlite as floatability filtering materials, and Zeolite as non-floatability - were compared. The upward-type filtering equipment was manufactured for the lab experiment, and CFD modeling was conducted to identify optimized design parameters. The results showed that the ratio of micro particles(<100 ㎛), to which the filtering process can be applied, was highest in samples from the road runoff, followed by one from the bridge, and from the parking lot. The results using road runoff displayed that EPP was most efficient with ratio of 89% to treat SS and COD
Bradley, Xuan Qi. "Analysis of Non-point Sources and Natural Attenuation Effect in the Acid Mine Drainage Affected Black Fork Sub-watershed, Perry County, Ohio." Ohio University / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1038836721.
Full textNheili, Rafife. "How to improve the numerical reproducibility of hydrodynamics simulations : analysis and solutions for one open-source HPC software." Thesis, Perpignan, 2016. http://www.theses.fr/2016PERP0045/document.
Full textHPC simulations in various scientific domains suffer from failures of numerical reproducibility because of floating-point arithmetic peculiarities. Different distributions of a parallel computation may yield different numerical results. Numerical reproducibility is a requested feature to facilitate the debug, the validation and the test of industrial or large software. In this thesis, we focus on the openTelemac software that implements finite element simulation for industrial and scientific hydrodynamics. We identify and analyze the sources of this reproducibility failure. We define and implement how to recover numerical reproducibility in two openTelemac modules. We also measure that the running time extra-cost of the reproducible version is reasonable enough in practice
Miguel, Rodrigo Brenner. "Aplicação da análise inversa para determinar os parâmetros do modelo de múltiplas fontes ponderadas para estimar o fluxo de calor de uma chama do tipo jato laminar de metano-ar." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/133131.
Full textThe accurate approximation of radiative heat flux on non-premixed flame in the region adjacent to the flame is required to guarantee the staff and machinery safety on oil and gas industry in cases of fuel leaking or disposal process. The physical phenomena involved on heat transfer and combustion has high computational cost in numerical simulation, in accidental leaking cases it is prohibitive. In the present study it is presented an application of Weighted Multi-Point Sources model to predict the radiative heat flux in the region adjacent to the flame. The simplified mathematical model has low computational cost and simulates the radiative heat transfer by punctual sources placed at the flame axis. Each source has the weight proportional to heat transfer contribution by each flame portion. To set each source's weight, it was used the inverse analysis by the Generalized Extremal Optimization. In inverse analysis the radiative heat fluxes are the input data while the weight of each source is the sought variable. As input data are used the radiative heat fluxes measured from a set of 12 flames, with power between 0.139 and 0.554 kW. The inverse analysis was used to recover the weights, and the fraction of heat radiated, which generate radiative heat fluxes with greater compatibility with the experimental data on three approaches. The first approach is to apply the inverse analysis in each flame separately, obtain the weights and then correlates them with the flame power. In method application for each flame, the maximum deviation between model outcome and experimental data was less than 5%. In a second approach, it was used the inverse analysis to directly obtain the coefficients of a function between the model's parameters and the flame’s power. When used just the flame power as model input parameter to distributes the sources and predict the heat flux, the maximum deviation is 18.6%. In the third approach, the inverse analysis was again used to find the coefficients of the function which correlates the flame power with model parameters, in this case was used the experimental flame length for positioning the point sources. For the case in which seven sources are positioned at 2.25 times the experimental length of the flame, the maximum deviation observed was 8.6% and the mean deviation of 2 9%.
Gonzalez, Ander. "Integration of photovoltaic sources and battery based storage systems – A DC analysis and distributed maximum power point tracking solution." Doctoral thesis, Universite Libre de Bruxelles, 2019. https://dipot.ulb.ac.be/dspace/bitstream/2013/282059/4/TOC_vf.pdf.
Full textDoctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished
Thomason, Krista A. "Trends Analysis and a Yearly Comparison of Point Sources of Atmospheric Mercury Using HYSPLIT Back Trajectories Focused in Athens, Ohio." Ohio University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1557161272706908.
Full textSpeir, Cameron Lindsey. "Two Cost Analyses in Resource Economics: The Public Service Costs of Alternative Land Settlement Patterns and Effluent Allowance Trading in Long Island Sound." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/31154.
Full textThe objective the first analysis is to determine the cost to local governments of providing water distribution and wastewater collection services to alternative spatial forms of residential development. Components of spatial form are explicitly defined in terms of lot size, distance and tract dispersion. An engineering cost model is used to determine the water and sewer costs to three sets of hypothetical land settlement scenarios. Each set shows the effect of one component of spatial form on cost.
The results show that smaller lots, shorter distances between existing centers and less tract dispersion reduce public water and sewer costs. Lot size is found to have the most pronounced effect on water and sewer cost. Some policy options for reducing the public service costs associated with development are considered.
The objective of the second cost analysis is to analyze the cost implications of a nitrogen allowance trading system for wastewater treatment plants in Connecticut. Effluent allowance trading involves the transfer of pollution control responsibility between pollution sources. Effluent allowances are the right to discharge a given quantity of waste into the environment over a given time period. Allowance trading has been proposed as a way of reducing pollution control costs, encouraging innovative pollution prevention techniques and more quickly achieving water quality goals.
Long Island Sound, a major estuary in the northeastern United States, experiences chronically low dissolved oxygen levels. Excessive nitrogen loads from anthropogenic activities in the Sound watershed have been identified as the cause of the oxygen problem. The state of Connecticut is examining the possibility of introducing an effluent allowance trading system in order to reduce the cost of achieving required reductions in nitrogen discharge.
A linear programming model is used to predict trading outcomes and allowance prices. The total cost of achieving a nitrogen load cap is calculated under three administrative approaches. The first approach is a uniform reduction requirement where all plants are required to reduce discharge by the same proportion. The second approach is an administrative reallocation of waste load where a regulatory agency assigns control responsibility based on the agency's understanding of relative costs. The third approach is a flexible effluent allowance trading system. The results will show that a trading program offers cost savings over traditional regulatory approaches, demonstrate the potential for further cost savings from pollution prevention activities and estimate the cost savings that would result from including nonpoint sources in the overall nitrogen reduction strategy.
Master of Science
van, der Kamp Jonathan [Verfasser]. "Social cost-benefit analysis of air pollution control measures - Advancing environmental-economic assessment methods to evaluate industrial point emission sources / Jonathan van der Kamp." Karlsruhe : KIT Scientific Publishing, 2017. http://www.ksp.kit.edu.
Full textKhiari, Souad. "Problèmes inverses de points sources dans les modèles de transport dispersif de contaminants : identifiabilité et observabilité." Thesis, Compiègne, 2016. http://www.theses.fr/2016COMP2301.
Full textThe research and the questions approached on this thesis are inverse type : the reconstruction of point-wise source or the data completion problem in parabolic models of transport of contaminants. The mathematical modelling of the problems of water pollution includes two tracers, the dissolved oxygen (DO) and the biochemical demand in oxygen (BDO) which is the quantity of oxygen necessary for the biodegradation of organic matter. Indeed, during the biodegradation process, aerobic bacteria play a leading part. These micro-organisms decompose polluting organic matters by using the dissolved oxygen in the middle. To compensate these missing data, fields, solutions of the problem, are observed directly or indirectly. The resulting inverse problems are ill-posed. Their mathematical study rises big complications and their numerical treatment isn't easy. We demonstrated a uniqueness result for fixed sources in the case of moved observations. The reality for the observation is qualified and the ideal is not acquired; direct measures on the BOD are difficult to obtain. On the Other hand to collect data on the DO is possible in real time With a moderate cost. The BOD is thus observed in indirect way, thanks to the coupling in the system of Streeter and Phelps, the information passes from the DO to the BOD. For this problem, we produced a uniqueness result for the reconstruction of source. Then, we examined the degree of instability of the equation to be solved. The behaviour of numerical methods depend on this type of information
Punase, Shubha. "Utilizing Multiple Data Sources In The Preparation Of A Vision Zero Plan For The City Of Alexandria: Investigating The Relationship Between Transportation Infrastructure, Socio- Economic Characteristics, And Crash Outcomes In The City." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/78329.
Full textMaster of Urban and Regional Planning
“Vision Zero,” first adopted by Sweden in 1997, is a road safety policy that aims to achieve a transportation system having zero fatalities or serious injuries for all modes of transportation. It takes a proactive approach to road safety system by identifying risk and taking steps to prevent injuries. Historically, traffic related crashes have disproportionately impacted vulnerable communities and system users including people of color, low income individuals, seniors, children, and pedestrians, bicyclists, and transit users (who typically walk to and from public transport). These inequities are addressed in the Vision Zero framework by prioritizing interventions in areas that need safety improvements the most. In 2016, the Alexandria City Council voted unanimously to develop a “Vision Zero” policy and program as a part of its updated transportation master plan. It required an initial equity analysis to assess the impact of traffic crashes on the traditionally underserved communities / groups (groups from at least one of these categories: low-income; minority; elderly; children; limited English proficiency; persons with disabilities; and/or pedestrians/ bicyclists/ transit users). This study combines three different methods to investigate the equity issues regarding traffic safety: 1) descriptive analysis of the spatial pattern of crashes and their relationship with the demographic profiles of neighborhoods at census block group level (for 2010-2014 period); 2) descriptive analysis of the crash trends in Alexandria; and 3) exploratory regression analyses for two different units of analysis (an aggregate regression analysis of crashes at census block group, and a disaggregate regression analysis of the individual level crash reports of traffic crashes). The analysis found that the elderly, school aged children, rail/subway users, and pedestrians had a higher risk of fatalities and severe injuries in traffic crashes. Higher job densities, alcohol impairment, and speeding were significantly related to higher KSI, whereas, smaller block sizes (higher number of street segments per sq. mile area of census block group), higher housing density, and use of safety equipment were related to lower KSI.
Gratecap, Jean-Baptiste. "Agriculture biologique et qualité des eaux dans des aires d’alimentation de captage : diversité des postures techniques d’agriculteurs conventionnels et biologiques et pressions nitrate et pesticide induites." Thesis, Paris, AgroParisTech, 2014. http://www.theses.fr/2014AGPT0059/document.
Full textMany problems with nitrate and pesticide contamination from agriculture exist in European drinking water catchments. In France, a new mitigation approach aims at preventing water quality degradation in explicitly targeting agricultural non-point source pollutions associated with leaching of nitrates and pesticides. This work aims at assessing the opportunity to develop organic farming in water catchment areas in order to reduce nitrate and pesticide leaching from root zone. The objective was to analyze both i) feasibility of conversions to organic farming on farms concerned by water preservation and ii) the potential impacts of these conversions in terms of nitrate and pesticide leaching reduction.To explore the potential contribution of organic farming in water catchment areas, we develop an innovative typology approach to characterize farmers’ conceptions and strategies related to cropping systems’ organization on the farm territory. Our method was tested in two French water catchment areas characterized by diversified production systems, where semi-structured interviews were carried out with conventional and organic farmers. Resulting typologies of farmers were used to assess leaching risks variability related with current cropping systems and to identify potential similarities between conventional and organic farmers’ conceptions. Nitrate and pesticide leaching risks for cropping systems were assessed and spatialized by using four agro-environmental indicators. Our results show major variations for all indicators at both study sites, for example N-surpluses which range from -105 to 192 kg N ha-1 year-1. These variations are deeply related with diversity of farmers’ conceptions summarized in typologies. To assess proximity of conventional farmers to organic farming, we used typologies to compare conceptions related to organization of cropping systems between conventional and organic farmers. By analyzing specificities of organic farmers’ conceptions, we determined three main criteria of proximity to organic farming; these criteria were then used to identify various degrees of proximity to organic farming among conventional farmers in the catchment areas.To assess potential contribution of organic farming to water preservation in catchment areas, we firstly compared nitrate leaching risks between conventional and organic cropping systems. Our results reveal low leaching risks from organic systems, characterized by reduced N-surpluses and lower bare soils frequencies in autumn. According to these results, massive development of organic farming should decrease nitrate leaching in our two water catchment areas. However, analysis of similarities between conventional and organic farmers’ conceptions shows that a majority of farmers are characterized by a low level of proximity to organic farming. Moreover, the farmers who show strongest similarities with organic farmers’ conceptions are already those with low leaching risks cropping systems. To significantly lower nitrate leaching risks, conversions should concern conventional farmers with low degree of proximity to organic farming
Ayvazyan, Vigen. "Etude de champs de température séparables avec une double décomposition en valeurs singulières : quelques applications à la caractérisation des propriétés thermophysiques des matérieux et au contrôle non destructif." Thesis, Bordeaux 1, 2012. http://www.theses.fr/2012BOR14671/document.
Full textInfrared thermography is a widely used method for characterization of thermophysical properties of materials. The advent of the laser diodes, which are handy, inexpensive, with a broad spectrum of characteristics, extend metrological possibilities of infrared cameras and provide a combination of new powerful tools for thermal characterization and non destructive evaluation. However, this new dynamic has also brought numerous difficulties that must be overcome, such as high volume noisy data processing and low sensitivity to estimated parameters of such data. This requires revisiting the existing methods of signal processing, adopting new sophisticated mathematical tools for data compression and processing of relevant information.New strategies consist in using orthogonal transforms of the signal as a prior data compression tools, which allow noise reduction and control over it. Correlation analysis, based on the local cerrelation study between partial derivatives of the experimental signal, completes these new strategies. A theoretical analogy in Fourier space has been performed in order to better understand the «physical» meaning of modal approaches.The response to the instantaneous point source of heat, has been revisited both numerically and experimentally. By using separable temperature fields, a new inversion technique based on a double singular value decomposition of experimental signal has been introduced. In comparison with previous methods, it takes into account two or three-dimensional heat diffusion and therefore offers a better exploitation of the spatial content of infrared images. Numerical and experimental examples have allowed us to validate in the first approach our new estimation method of longitudinal thermal diffusivities. Non destructive testing applications based on the new technique have also been introduced.An old issue, which consists in determining the initial temperature field from noisy data, has been approached in a new light. The necessity to know the thermal diffusivities of an orthotropic medium and the need to take into account often three-dimensional heat transfer, are complicated issues. The implementation of the double singular value decomposition allowed us to achieve interesting results according to its ease of use. Indeed, modal approaches are statistical methods based on high volume data processing, supposedly robust as to the measurement noise
Anastassiou, Michel. "Influence des conditions de soudage sur les contraintes residuelles dans un point soude par resistance sur toles minces d'acier a bas carbone : relation avec la tenue en fatigue." Paris, ENSAM, 1987. http://www.theses.fr/1987ENAM0012.
Full textPerakis, Nikolaos. "Separation et detection selective des composes soufres dans les fractions lourdes des petroles : geochimie des benzo (b) thiophenes." Université Louis Pasteur (Strasbourg) (1971-2008), 1986. http://www.theses.fr/1986STR13093.
Full textFujdiak, Radek. "Analýza a optimalizace datové komunikace pro telemetrické systémy v energetice." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-358408.
Full textLeung, Ming-Kei, and 梁銘基. "First flush analysis of agricultural non-point source." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/46935419760533270469.
Full text國立成功大學
環境工程學系碩博士班
96
Stormwater runoff was monitored on 6 separate agricultural watersheds, which were chosen to represent distinct types of farming and spreading chicken fields, along with various watershed characteristics. A total of 57 storm events were monitored to investigate the first flush phenomenon. There are two first flush phenomenon definition, one is concentration first flush(CFF), another is mass first flush(MFF). CFF may be defined as the initial period of stormwater runoff during which the concentration of pollutants is substantially higher than during later stages. MFF may be defined as the initial period of stormwater runoff during which the quality of pollutants throughout the majority of the pollution load. The magnitude of the first flush phenomenon was calculated using a method of data analysis which results in determining the dynamics event mean concentration ratio(REMC) and mass first flush ratio(MFFn). In addition, statistical and graphical correlation analysis of the REMC and MFFn with storm characteristics and environmental factors was made to determine if the first flush is related to site or storm characteristics. As the results, although the percentage of impervious area near zero, we can still be found strength to moderate concentration first flush phenomenon and moderate to mild mass first flush phenomenon in agricultural area. The results and analyses performed also indicates that the concentration first flush phenomenon of SS,COD and TP correlate well with total rainfall, total runoff and rain time but there are no correlation between the mass first flush phenomenon. No correlation was observed between the first flush phenomenon and area, slope and porosity. In this study, through cluster analysis proved that the first flush phenomenon in agricultural areas occurred mainly on non-soluble pollutants.
Hong, Hong-Jyh, and 洪轟誌. "Parameter Uncertainty Analysis for a Grid-Based Non-Point Source Pollution Model." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/61159924289200892288.
Full text國立交通大學
環境工程研究所
82
Non-point source pollution control(NPSPC) for reservoir has become a major environmental protection mission in Taiwan, ROC. Mathematical models are applied for evaluation of NPSPC related tasks. Model parameter uncertainty, however, introduces significant effect on modeling results and thus the decision made on the basis of these results may not be appropriate. This research was therefore initiated for analyzing the parameter uncertainty for exploring an improved modeling procedure. Drainage pattern generated from DEM data and rainfall intensity were the two parameters studied for their uncertainties in this research. A program was developed to resolve conflicting directions in a DEM generated drainage pattern for use by a grid based nonpoint source pollution model, AGNPS. Auto-MOUSE, a Monte-Carlo analysis package, was integrated with AGNPS for assessing the rainfall uncertainty. A case study for the watershed of the Po-San off-channel reservoir in Hsinchu County was implemented. Significant spatial variation of pollution distribution simulated by using different drainage pattern generating methods was observed. The effect of rainfall randomness on seasonal and spatial loading distribution was assessed and computed based on a Monte- Carlo simulation. Graphical presentations of research results and spatial data analysis were implemented by a geographical information system, Grass. It is expected that the quality of decision making can be effectively improved with the proposed parameter uncertainty analysis procedure.
Fu, Jenn-Hsin, and 傅振鑫. "Analysis and Experimental Study of The Characteristics of The Point Sound Source Image." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/37662353139024339920.
Full text逢甲大學
機械工程學系
87
The sound-sources image display technique is one of the recently proposed blend guide techniques. It has serious problems of both poor resolution and difficulty in implementation. For overcome those drawbacks, the technique of sound virtual reality is considered. One of the know how of applying the technique of sound virtual reality to sound-sources image display technique is the most suitable frequency for sound-sources image display implementation, and analyze the directional sensitivity of human ears to point sound source locations in 3-D space. This paper concludes the experimental results of the most suitable frequency and the location sensitivity. The most suitable frequency is the frequency that both is clearly to human hearing and makes the maximum difference in voltage measured at both ears. This study conducts experiments to determine this frequency first, then adopts this frequency for sound-sources image display implementation to determine the directional sensi-tivity of human ears to point sound source locations in 3-D space. For the experimental of location sensitivity determination, this study adopts the center of human head as the origin of the 3-D coordinates, and put the point-sound-source locations around the hemi-sphere surface to analyze the frequency response of the human ears and determine the location sensitivity.
Yuan, Kuo Lei, and 郭力源. "Thermoelastic analysis of an infinite curvilinear cracked plate th a point heat source." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/68303739182563101227.
Full text國立臺灣科技大學
工程技術研究所
81
Boundary value problems for circular-arc crack embedded in the homogeneous material or dissimilar materials under the appli -cation of a point heat source are formulated and solved in clos -ed form. Based on the Hilbert problem formulation and a special technique of contour integration, exact solutions of the tempera -ture field and stress field are obtained in an explicit form. It is found that the temperature gradient or thermal stresses near the tips of a curved crack always possess the characteristic inverse square-root singularity in terms of the radial distence away from the crack tip under the application of heat source. Due to this singular behavior, the heat flux intensity factor is intr -oduced to measure the thermal energy intensification cumulated in the vicinity of the crack tip. Numerical results for the temp -erature and heat flux intensity factor are provided in graphic form. The simultaneous existence of Mode-I and Mode-II stress int -ensity factors are provided in the present study. It is shown that the thermal system having a smaller crack length would make the heat flux intensity factor lower. Both the Mode-I and Mode-II stress intensity factors for homogeneous material are found to depend on the strength of heat source, heat conductivity as well as thermal and elastic properties. The non-negative Mode-I stress intensity factor is found to present in this paper for the applic -ation of the heat sink which validates the fully open cracksumption.
Burley, Ryan Thomas. "Application of Importance Sampling for Point Source Analysis with the IceCube Neutrino Observatory." Thesis, 2020. http://hdl.handle.net/2440/124928.
Full textThesis (MPhil) -- University of Adelaide, School of Physical Sciences, 2020
Chen, Shi Zhong, and 陳世忠. "Thermal stress analysis of crack problems in bonded dissimilar media with a point heat source." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/94508862869652294302.
Full textWang, Jian Wen, and 王建文. "Thermal stress analysis of the half-plane crack problem under a point heat source on its surface." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/56787530011515082672.
Full textZHENG, YU-XIANG, and 鄭宇翔. "Three-level Neutral Point Clamped (NPC) Rectifier Using DC-Bus Voltage Ripple Analysis under Unbalanced Grid Source." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/7933z5.
Full text國立臺灣科技大學
電機工程系
107
This thesis proposes a control strategy for a three-level diode clamped ac/dc converter to achieve balanced line current under unbalanced ac source. Consequently, through the control scheme proposed, in this paper, it can not only balance input current but also reduce dc output voltage ripple when three-phase neutral-point clamped rectifier works on input voltage unbalance condition. The proposed strategy is based on the ripple characteristics in the dc filter capacitors deployed in the dc output. The ac ripples contained in the dc voltages of the filter capacitors are highly affected by the balanced condition of the ac source. Under ideally ac source, only sixth harmonics will exixt, while second and third harmonics will emerge under unbalanced ac source. The latter two harmonics will change the ripple waveforms dramatically and then makes power quality deterioration. These multi-harmonic ripple waveforms can be used to compensate the unbalanced line current caused by unbalanced ac source, and no need to use coordinate transformation, positive and negative phase sequence disconnecting method, direct power control that calculations and analysis can control the current imbalance. The converter dc output voltage is regulated by the coltroller with unity power factor. The ripple waveforms are trsansfered to pulse type, form which the pulse wides are used to estimate the unbalanced condition of the ac sourcecontrol system and then control scheme is planned to control device to generate the compensated comment of line cueernt, at last, through current control loop control three-phase input current, using pulse width modulation generate switch signal, so it can improve and modulate input ac current unbalance factor. The control scheme of this thesis using Matlab/Simulink simulation system to evaluate the performance of the proposed scheme. Moreover, the a 750VDC/2kW, PF 0.99 three-phase NPC rectifier prototype based on digital signal processor TMS320F28069 also is established to demonstrate the vadility of the proposed system. Both simulation and experimental results show the correctness and practicality of proposed control scheme.
Fitzgerald, Garrett Christopher. "Multi-scale Analysis of Methane Gas Hydrate Formation and Dissociation via Point Source Thermal Stimulation and Carbon Dioxide Exchange." Thesis, 2014. https://doi.org/10.7916/D8VQ30M7.
Full text"Modeling Occurrence and Assessing Public Perceptions of De Facto Wastewater Reuse across the USA." Doctoral diss., 2014. http://hdl.handle.net/2286/R.I.25045.
Full textDissertation/Thesis
Ph.D. Civil and Environmental Engineering 2014
Ho, Chia-Yu, and 何家宇. "Thermographic detection and analysis of the temporal and spatial evolution of temperature on the basis of point heat source model upon optical heating of gold nanorod assembly immobilized in agar." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/tqqtma.
Full textSingh, Urisha. "The health-related microbial quality of drinking water from ground tanks, standpipes and community tankers at source and point-of-use in eThekwini Municipality : implications of storage containers, household demographics, socio-economic issues, hygiene and sanitation practices on drinking water quality and health." Thesis, 2009. http://hdl.handle.net/10413/8362.
Full textThesis (M.Sc.)-University of KwaZulu-Natal, 2009.
Huo, Sheng-chung, and 霍勝中. "Characteristic Analysis of Non-point Sources." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/09584142419335619337.
Full text朝陽科技大學
環境工程與管理系碩士班
93
This research is based on Non-point source pollution characteristics analysis in Tseng-Wen reservoir. The pollution of water quality is caused on all kinds of land to distribute into control extend is the best method in Tseng-Wen reservoir . Fist collect information to understand on the pollution and condition to the land and use factor analysis to ask for the important parameters and use canonical correlation to understand pollution condition。Then use dummy variable regression to research relevant problems.
Wu, Tung-Hsuan, and 吳東軒. "Analysis of Error Sources in First-order Leveling:Effect of Subsidence of Turning Point." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/41205936488965312292.
Full text國立成功大學
測量及空間資訊學系碩博士班
94
The way of precise leveling is taking every station forwards step by step. All sections have to observe several times often, and it will be generous that the systemic error is possible accumulated. Because of the high precision, people will be very deeply concerned to the small system error not noticing in the past. At all times, people don’t pay much attention to the subsidence of a spirit level and turning point in leveling. On the one hand, few amount of errors is neglected, on the other, errors could be eliminated when using an order of leveling. Not only on reading, the rods which will change the other side have slight subsidence when the spirit level stands from the odd number to the even station and begins observing. In addition, the value will be accumulated systematically with the number of setups. The study lies in different views analyze TWVD2001 materials which section discrepancies have seriously positive situation, and compare to the Taiwan high speed rail leveling data that needn't use the plates while observing. For this reason, the phenomenon that subsidence of turning point will not happen because it has fixed points per 30~40 meters by the track. We must verify that there are obvious differences in the two materials, and estimate TWVD2001 remaining systematic error correction parameters according to the reason that the error may be accumulated. Besides, we should also infer that remaining systematic error correction parameters caused by rods subsidence but not the movement of turning plate between two setups. In conclusion, through the correction of turning point subsidence. The average of normalized section discrepancies lower from 1.21mm to 0.01mm. It is improved by a wide margin.
Coulson, Adam Lee. "Investigation of the Pre to Post Peak Strength State and Behaviour of Confined Rock Masses Using Mine Induced Microseismicity." Thesis, 2009. http://hdl.handle.net/1807/19183.
Full textLee, Jong-Hwa. "Spatial econometric analysis of a watershed utilizing geographic information systems water quality effects of point and non-point pollution sources in the Neuse River Basin, NC /." 2005. http://www.lib.ncsu.edu/theses/available/etd-12092005-135010/unrestricted/etd.pdf.
Full textWang, Renxiang. "Lithium Ion Battery Failure Detection Using Temperature Difference Between Internal Point and Surface." 2011. http://hdl.handle.net/1805/2979.
Full textLithium-ion batteries are widely used for portable electronics due to high energy density, mature processing technology and reduced cost. However, their applications are somewhat limited by safety concerns. The lithium-ion battery users will take risks in burn or explosion which results from some internal components failure. So, a practical method is required urgently to find out the failures in early time. In this thesis, a new method based on temperature difference between internal point and surface (TDIS) of the battery is developed to detect the thermal failure especially the thermal runaway in early time. A lumped simple thermal model of a lithium-ion battery is developed based on TDIS. Heat transfer coefficients and heat capacity are determined from simultaneous measurements of the surface temperature and the internal temperature in cyclic constant current charging/discharging test. A look-up table of heating power in lithium ion battery is developed based on the lumped model and cyclic charging/discharging experimental results in normal operating condition. A failure detector is also built based on TDIS and reference heating power curve from the look-up table to detect aberrant heating power and bad parameters in transfer function of the lumped model. The TDIS method and TDIS detector is validated to be effective in thermal runaway detection in a thermal runway experiment. In the validation of thermal runway test, the system can find the abnormal heat generation before thermal runaway happens by detecting both abnormal heating power generation and parameter change in transfer function of thermal model of lithium ion batteries. The result of validation is compatible with the expectation of detector design. A simple and applicable detector is developed for lithium ion battery catastrophic failure detection.