Tesis sobre el tema "Absorption estimation"
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Zhang, Changjun. "Seismic absorption estimation and compensation". Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/2820.
Texto completoKarlsson, Hanna, Ingemar Fredriksson, Marcus Larsson y Tomas Strömberg. "Inverse Monte Carlo for estimation of scattering and absorption in liquid optical phantoms". Linköpings universitet, Biomedicinsk instrumentteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-78815.
Texto completoFunding Agencies|VINNOVA||Perimed AB|2008-00149|ResearchGrow program|2011-03074|European Union||Linkoping University through the Center for Excellence NIMED-CBDP (Center for Biomedical Data Processing)||
Layfield, Andrew. "An evaluation of selected estimation methods for the processing of differential absorption lidar data". Thesis, University of Hull, 1987. http://hydra.hull.ac.uk/resources/hull:16436.
Texto completoFox-Neff, Kristen. "Inverse Methods in Parameter Estimation for High Intensity Focused Ultrasound (HIFU)". University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1459155373.
Texto completoMartínez, Maradiaga David Estéfano. "Modelling and data validation for the energy analysis of absorption refrigeration systems". Doctoral thesis, Universitat Rovira i Virgili, 2013. http://hdl.handle.net/10803/128508.
Texto completoLos procedimientos de validación y reconciliación de datos se han utilizado en la industria de procesos para mejorar la precisión de los datos. Estos procedimientos aprovechan la redundancia enlas mediciones para obtener un conjunto de datos ajustados que satisfacen el modelo de la planta. Sin embargo, no hay muchas aplicaciones que traten con ciclos cerrados, y configuraciones complejas, como los ciclos de refrigeración por absorción. Esta tesis propone una metodología para la validación de datos en estado estacionario de enfriadoras de absorción. Estametodología incluye la identificación del estado estacionario, la resolución de los problemas de reconciliación de datos y estimación de parámetrosy la detección de errores sistemáticos. Esta metodología será útil para generar un conjunto de medidas coherentes para aplicaciones como: cálculo de prestaciones, desarrollo de modelos empíricos, optimización, etc. La metodología es demostrada utilizando datos experimentales de diferentes enfriadoras de absorción, con diferentes niveles de redundancia.
Johansson, Johannes y Karin Wårdell. "Intracerebral quantitative chromophore estimation from reflectance spectra captured during deep brain stimulation implantation". Linköpings universitet, Biomedicinsk instrumentteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-81381.
Texto completoBraddy, April C. "Increased-throughput screening of potential drug candidates for permeation across membranes and estimation of central nervous system bioavailability". [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0008420.
Texto completoTypescript. Title from title page of source document. Document formatted into pages; contains 167 pages. Includes Vita. Includes bibliographical references.
Zhang, Yunjiang. "Estimation multi-annuelle des sources d’aérosols organiques et de leurs propriétés d’absorption de la lumière en région Parisienne". Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLV013.
Texto completoCarbonaceous aerosols, including organic aerosols (OA) and black carbon (BC), are playing important roles on air quality and climate change. Therefore, quantifying contribution of their emission sources, as well as the sources of their gaseous precursors, is needed to implement efficient mitigation measures. Investigating trends in atmospheric composition is also essential to a better knowledge of present and future impacts of airborne particles on global warming. This work aimed at investigating on-line and in situ carbonaceous aerosol measurements performed for more than 6 years at the SIRTA facility (Site Instrumental de Recherche par Télédétection Atmosphérique). This observatory platform is part of the ACTRIS (Aerosols, Clouds, Trace gases Research InfraStructure). It is located 25 km southwest of Paris city center and is representative of background air quality in the Ile de France region. The main sources of submicron OA were discriminated through Positive Matrix Factorization applied to Aerosol Chemical Speciation Monitor (ACSM) data. Light absorption properties of BC and brown carbon (BrC) were obtained from multi-wavelength Aethalometer measurements. Converging results illustrated well-marked seasonal, weekly, and diel cycles of the various primary and secondary carbonaceous aerosol fractions. Primary OA (POA), mainly from wood burning and traffic emissions, were confirmed to dominate submicron OA concentrations during the coldest months (November to February), while Oxygenated OA (OOA) were shown as the major contributors during the rest of the year. Less Oxidized OOA (LO-OOA), possibly with predominant biogenic origins, were found to contribute up to about 60% of total submicron OA on average in summer. Trend analyses indicated slight decreasing features (in the range of 0.05-0.20 µg m-3 yr-1) for every OA fractions over the 6+-year investigated period, except for this LO-OOA factor which showed no significant trend. Regarding absorption properties, BrC - with overwhelming biomass burning origin - was found to have equivalent light absorption impact than BC at near-ultraviolet wavelengths during the winter season. In summer, a mean value of 1.6 was obtained for BC absorption enhancement (Eabs) due to secondary aerosol lensing effect, supporting possible higher BC-related radiative impact than currently expected. Last but not least, More Oxidized OOA (MO-OOA) were shown as the main agent for this Eabs and then appeared as one of the most critical aerosol fraction to be considered within near-future climate models
Hay, Timothy Deane. "MAX-DOAS measurements of bromine explosion events in McMurdo Sound, Antarctica". Thesis, University of Canterbury. Physics and Astronomy, 2010. http://hdl.handle.net/10092/5394.
Texto completoMorettini, Micaela. "Mathematical model of standard oral glucose tolerance test for characterization of insulin potentiation in health". Doctoral thesis, Università Politecnica delle Marche, 2012. http://hdl.handle.net/11566/241987.
Texto completoTwo new formulations, respectively denominated INT_M1 and INT_M2, of an integrated mathematical model to describe the glycemic and insulinemic responses to a 75 g oral glucose tolerance test (OGTT) are proposed and compared. The INT_M1 assumes a single compartment for the intestine and the derivative of a power exponential function for monophasic representation of gastric emptying rate profile. In the INT_M2, a nonlinear three-compartment system model is adopted to produce a more realistic, multiphase gastric emptying rate. Both models were implemented in a Matlab-based, two-step procedure for estimation of seven adjustable coefficients characterizing the gastric emptying rate and the incretin, insulin and glucose kinetics. Model behaviour was tested vs. data of mean plasma glucagon-like peptide 1 (GLP-1), glucose-dependent insulinotropic polypeptide (GIP), glucose and insulin concentrations provided by two different laboratories, where glycemic profiles observed during a 75 g OGTT were matched in healthy subjects (HC1- and HC2-group, respectively) by means of an isoglycemic intravenous glucose (I-IVG) infusion. Under the hypothesis of an additive effect of GLP-1 and GIP on insulin potentiation, our results demonstrated a substantial equivalence of the two models in matching the data. Model parameter estimates showed to be suitable markers of differences observed in the OGTT and matched I-IVG responses from the HC1-group compared to the HC2-group. Model implementation in our two-step parameter estimation procedure enhances the possibility of a prospective application for individualization of the incretin effect in a single subject, when his/her data are plugged in.
O'Neill, Brendan Commander(Brendan William). "Signal absorption-based range estimator for undersea swarms". Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/129031.
Texto completoCataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 97-102).
Robotic swarms are becoming increasingly complex on the surface and in air due to highspeed and reliable communication links, Global Positioning Satellites (GPS), and visual support to relative navigation. However, the limited propagation of these signals in the ocean has impacted similar advances in undersea robotics. Autonomous underwater vehicles (AUVs) often rely on acoustics to inform navigation solutions; however, this approach presents challenges for scalable robotic swarms. Acoustic navigation is a means to inform range and bearing to a target. Many methods for range and bearing estimation, including current low-cost solutions, rely on precision time synchronization or two-way communication to compute ranges as part of a full navigation solution. The high cost of reliable Chip-scale atomic clocks (CSACs) and acoustic modems relative to other vehicle components limits large-scale swarms due to the associated cost-per-vehicle and communications infrastructure.
We propose a single, high-cost vehicle with a reliable navigation solution as a "leader" for a scalable swarm of lower-cost vehicles that receive acoustic signals from a source onboard the lead vehicle using a single hydrophone. These lower-cost "followers" navigate relative to the leader according to the preferred behavioral pattern, but for simplicity, we will refer to a simple following behavior in this work. This thesis outlines a method to obtain range estimates to sound sources in which the signal content, including frequency and power at its origin, can be reasonably approximated. Total transmission loss is calculated based on empirical equations for the absorption of sound in seawater and combined with geometric spreading loss from environmental models to estimate range to a source based on the loss at differential frequencies. We refer to this calculation as the signal absorption-based range estimator (SABRE).
This method for obtaining range combines with Doppler-shift methods for target bearing based on the maximum frequency detected within a banded limit around a known source frequency. A primary objective for SABRE is to address techniques that support low-cost options for undersea swarming. This thesis's contributions include a novel method for range estimation onboard underwater autonomous vehicles that supports navigation relative to a known source when combined with Doppler-shift methods for target bearing. This thesis seeks to develop the theory, algorithms, and analytical tools required and apply those tools to real-world data sets to investigate the feasibility, sources of error, and accuracy of this new approach to range estimation for underwater swarms.
by Brendan O'Neill.
S.M.
S.M. Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Department of Mechanical Engineering; and the Woods Hole Oceanographic Institution)
Jawad, Ourouk. "Etude de l'exposition des personnes aux ondes électromagnétiques en environnement complexe". Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066292/document.
Texto completoResearch in non-ionizing numerical dosimetry has been improved thanks to high calculation capacity of computers. These years, integrating variability in the field of dosimetry has become a major issue. Sources of variability are numerous; among them, there are the exposure conditions to electromagnetic radiation which can lead to very different absorbed doses. Indoor channel modeling enables to have a deep knowledge of the exposure conditions of a human body located inside this indoor environment. The aim of this thesis is to develop a statistical method of calculation of the absorbed dose by the human body and to adapt the stochastic channel model to dosimetry. The statistical study of exposure reveals the need to obtain Specific Absorption Rate values for a plane wave exposure for all possible angles of incidence. Taking into account that computation in dosimetry is time consuming, an efficient interpolation method, kriging method, is implemented in order to get whole body Specific Absorption Rate values. Kriging method enables to obtain Specific Absorption Rate for all possible angles of incidence and then to calculate expectation and variance of Specific Absorption Rate. Sensitivity Analysis of expectation and variance to the statistical channel parameters reveals the impact of each parameter. The channel model has been simplified and then adapted to dosimetry by estimating the approximation error induced by this reduction. This thesis answers to the issue of integrating variability in dosimetry in a complex environment and develop the tools that open a new path in studying exposure in any complex environment
Ovigneur, Bertrand. "Description des propriétés macrophysiques et microphysiques des nuages par télédétection active et passive : application à la campagne aéroportée FRENCH/DIRAC". Lille 1, 2005. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2005/50376-2005-Ovigneur.pdf.
Texto completoPar des méthodes stéréoscopiques ou basées sur l'absorption par le dioxygène, POLDER fournit une information sur l'altitude des nuages. Celle-ci est moins précise mais présente l'avantage de rendre compte du large champ spatial couvert par l'instrument. Les mesures polarisées de POLDER ou de LEANDRE permettent une estimation de la phase thermodynamique des nuages, mais par commodité, une méthode simple basée sur le rapport des luminances mesurées dans le visible et le moyen infrarouge par MiniMIR est développée et privilégiée dans cette étude. Finalement, une méthode d'estimation optimale est développée et mise en œuvre pour déterminer l'épaisseur optique des nuages et la dimension des particules qui les constituent à partir de mesures passives dans le visible et dans le moyen infrarouge. Comparée aux méthodes précédemment développées au laboratoire, cette méthode permet d'obtenir des précisions similaires sur les paramètres nuageux déterminés. Toutefois, elle offre l'avantage d'exploiter naturellement les mesures multidirectionnelles de POLDER ainsi que d'autres informations ou données auxiliaires. De part sa modularité, cette méthode pourrait permettre d'exploiter en synergie les mesures de l'A-train
Gorman, Ng Melanie. "Development of a predictive tool for estimating occupational inadvertent ingestion exposure". Thesis, University of Aberdeen, 2013. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=211182.
Texto completoWetter, Erik. "Patterns of performance in new firms : estimating the effects of absorptive capacity". Doctoral thesis, Stockholm : Economic Research Institute, Stockholm School of Economics (EFI), 2009. http://www2.hhs.se/efi/summary/783.htm.
Texto completoMukherjee, Moumita. "Instrumented permeable blankets for estimating subsurface hydraulic conductivity and confirming numerical models used for subsurface liquid injection". Diss., Connect to online resource - MSU authorized users, 2008.
Buscar texto completoTräber, Stephan Christian [Verfasser] y Werner [Akademischer Betreuer] Rühm. "Estimating the absorption of ingested soil-derived uranium and the resulting internal dose to humans : development and application of a new method / Stephan Christian Träber ; Betreuer: Werner Rühm". München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2021. http://d-nb.info/1236502175/34.
Texto completoAVEGLIANO, ROSEANE P. "Estudo de dieta total no estado de Sao Paulo: estimativa de ingestao dietetica de elementos toxicos (arsenico e cadmio) e essenciais (calcio, cromo, ferro, selenio, sodio, potassio e zinco)". reponame:Repositório Institucional do IPEN, 2009. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11523.
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Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
Liao, Shaojuan. "Three Essays on Economic Growth and Technology Development: Considering the Spillover Effects". Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/37808.
Texto completoPh. D.
王, 勝強 y Shengqiang WANG. "Remote Estimation of Phytoplankton Size Structure Using Light Absorption Spectra". Thesis, 2014. http://hdl.handle.net/2237/20720.
Texto completoLIN, YUAN-HUNG y 林元弘. "Optimization of Specific Absorption Rate Based on a Fast Estimation Model for Multiple-Antenna Transmitters". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/g2v8u7.
Texto completo國立臺北科技大學
電子工程系
107
We use a rapid estimating model to calculate specific absorption rate (SAR) proposed by preceding studies to expand into optimized models. The SAR value is an important parameter for mobile handheld communication devices. We direct the primary beam of an antenna array toward the desired direction and minimize the maximum SAR value on an observation plane of a phantom simultaneously. In multi-antenna devices, the SAR value is affected by current amplitude distribution and excitation phases of feed currents. Mobile antennas designers will need to align the main beam of the multi-antenna while it is aiming at a target, as well as attempt to minimize the SAR value. However, it is very time-consuming to analyze the specific current amplitude distribution and phase angle caused by the SAR value through full-wave simulations. To reduce the number of simulations, Le’s research team proposed a fast estimation model to calculate the SAR value of multi-antenna transmitting devices. The key feature of this fast estimation model is that solely the pre-planned simulations for the array need to be managed and the current phase angles should satisfy the requirements of a specific matrix. Then, after calculating the SAR value caused by any phase angle, there is no need to re-analyze the phase angle through full-wave simulations, and we only need to follow the results of the array simulation to obtain a fast and accurate response. However, the rapid estimation simulation of the reference did not consider the calculation of different current amplitudes, and only the SAR value for a uniform current distribution can be obtained. Here, we expand the valid range of the cited method, allowing the model applied to the specific absorption rate values of arbitrary current amplitudes and excitation phases, and the model still demonstrates fast estimation. We used the full-wave simulation to verify the proposed method and the simulation results are in agreement with the numerical analysis. This indicates that this model uses the maximum SAR value of the surface as an objective function and uses the current amplitudes of multiple antennas as the decision variables. We use the enumeration method to solve the current distribution that minimizes the specific absorption rate. The four-antenna elements array was validated such that the primary beam of the antenna array is angled at 0˚, ±10˚, ±20˚… ±80˚, ±90˚, respectively, to minimize the maximum SAR value of these situations. The optimization results demonstrate that the method exhibits an average improvement of 19%. Finally, this thesis implements this four-antenna element array, which verified the accuracy of the method by measuring its radiation pattern.
Chou, Hung-Yi y 周宏奕. "In vitro estimation of percutaneous absorption of single or mixed exposure to Benzo(a)Pyrene and Di-hydroxybenzene". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/53751682720759327498.
Texto completo中國醫藥大學
公共衛生學系碩士班
100
Benzene(a)pyrene is a kind of polycyclic aromatic hydrocarbons compounds, and it’s the group 1 carcinogen chemical classification of international cancer research organization, and many animals studies have confirm the carcinogenic potential for squamous cell carcinoma. Benzo(a)Pyrene is produced from combustion reaction, with other chemicals before the human exposure. In the past studies, benzo(a)Pyrene was only concerned about single exposure experiment, but co-exposed with other chemicals. The other kind of combustion reaction chemical, di-hydroxybenzene, has been shown to increase the possibility of skin cancer with benzo(a)pyrene. In this study we try to estimate of percutaneous absorption of single or mixed exposure to benzo(a)Pyrene and di-hydroxybenzene to calculate the kinetic parameters of skin penetration, and to discuss the possible health risks after skin exposure to benzo(a)pyrene and di-hydroxybenzene. In vitro static diffusion cell with a pig’s skin was used in our absorption experiment. Sequence tape-stripping method was used to estimate the substance distribution in stratum corneum. Then receptor fluid analysis was to know how many substances penetrate through the skin. Using the high-performance liquid chromatography with UV detector to analysis all of the samples, and used the results to estimate the kinetic parameters. The results showed the combined exposure to benzo(a)pyrene and di-hydroxybenzene would increase the amount of benzo(a)Pyrene in stratum corneum, and the diffusion coefficient and partition coefficient were also changed; for di-hydroxybenzene, the permeability coefficient of chemical substances was increased. The cancer risk increased when benzo(a)Pyrene and di-hydroxybenzene concurrent in occupational workers. In conclusions, co-exposure to benzo(a)Pyrene and di-hydroxybenzene will change the kinetic parameters in stratum corneum and the systemic absorption conditions, and it will increase the cancer risk from 1.49×10-4 to 5.55×10-4, when co-exposure to these chemical substances.
OH, DOO-MAN. "ESTIMATING ORAL DRUG ABSORPTION IN HUMANS (DRUG ABSORPTION)". 1991. http://catalog.hathitrust.org/api/volumes/oclc/68790723.html.
Texto completoCrison, John Robert. "Estimating the dissolution and absorption of water insoluble drugs in the small intestine". 1993. http://catalog.hathitrust.org/api/volumes/oclc/68796629.html.
Texto completoChen, Kuo-Feng y 陳國峰. "Calculation of the Gain and Absorption Coefficient in Quantum We- ll and Estimating the Efficiency for Reducing Carriers Current by Multiple Quantum Barriers in Semiconductor Lasers". Thesis, 1995. http://ndltd.ncl.edu.tw/handle/86514418157652798602.
Texto completo國立交通大學
光電(科學)研究所
83
First, the optical gain and absorption without Coulomb interacti- on between electrons and holes are analyzed for quantum well las- ers. When the intraband relaxation is considered, the gain/absor- ption spectral shape becomes smooth and broad in spite of the sh- arp step-like density of state. However, the Coulomb attraction between the conduction-band electron and the valence-band hole l- eads to considerable changes in the optical properties of the qu- antum well around the absorption edge, especially below absorpti- on edge. There are intense absorption lines below the bandgap en- ergy, that is, less photon energy is required for the exciton tr- ansition compared with the bandgap transition. Finally, we have provided a clear and simple method for the optimal design of any MQB structure by calculating the carrier blocking efficiency for the first time. Our method predicted substantial improvement of the differential quantum efficiency of a SCH-SQW laser with opti- mal MQB design and agrees with experimental results.