Дисертації з теми "Mode field spatial distribution"
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Odarenko, E. N., Y. V. Sashkova, and A. A. Shmat’ko. "Localized field enhancement in slow-wave modes of modified Bragg waveguide." Thesis, IEEE, 2017. https://openarchive.nure.ua/handle/document/18123.
Повний текст джерелаSashkova, Y. V., and E. N. Odarenko. "The Effect of Additional Layers Parameters on the Modifided Bragg Waveguide Characteristics." Thesis, IEEE, 2017. https://openarchive.nure.ua/handle/document/18112.
Повний текст джерелаHaag, Christian. "Temporal and spatial wind field distribution in Delaware Bay." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 9.11 Mb., 62 p, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:1430767.
Повний текст джерелаPrincipal faculty advisors: Kenneth E. Barner, Dept. of Electrical and Computer Engineering; and Mohsen Badiey, Dept. of Marine and Earth Studies. Includes bibliographical references.
Getachew, T. (Tibebu). "Spatial-temporal structure and distribution of the solar photospheric magnetic field." Doctoral thesis, Oulun yliopisto, 2019. http://urn.fi/urn:isbn:9789526224367.
Повний текст джерелаOriginal papers Original papers are not included in the electronic version of the dissertation. Getachew, T., Virtanen, I., & Mursula, K. (2017). Structure of the Photospheric Magnetic Field During Sector Crossings of the Heliospheric Magnetic Field. Solar Physics, 292(11). https://doi.org/10.1007/s11207-017-1198-9 http://jultika.oulu.fi/Record/nbnfi-fe201802083259 Getachew, T., Virtanen, I., & Mursula, K. (2019). Asymmetric Distribution of Weak Photospheric Magnetic Field Values. The Astrophysical Journal, 874(2), 116. https://doi.org/10.3847/1538-4357/ab0749 http://jultika.oulu.fi/Record/nbnfi-fe2019061320447 Getachew, T., Virtanen, I., & Mursula, K. (2019). A New Signal of the Solar Magnetic Cycle: Opposite Shifts of Weak Magnetic Field Distributions in the Two Hemispheres. Geophysical Research Letters, 46(16), 9327–9333. https://doi.org/10.1029/2019gl083339 Mursula, K., Getachew, T., & Virtanen, I. (2019). Spatial-temporal evolution of photospheric weak-field shifts in solar cycles 21-24. Astron. Astrophys., submitted
Wood, Gillian Ann. "Field arrangements in the West Riding of Yorkshire in the High Middle Ages." Thesis, University of Leeds, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.275806.
Повний текст джерелаLavinsky, D. V. "Structural analysis of the technological systems under electromagnetic field action." Thesis, Center of educational literature, 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/22372.
Повний текст джерелаStewart, Kelley Christine. "Quantitative Hydrodynamics Analysis of Left Ventricular Diastolic Dysfunction using Color M-Mode Echocardiography." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/35466.
Повний текст джерелаMaster of Science
Fisher, Aaron Jay. "Predicting spatial distribution of critical pore types and their influence on reservoir quality, Canyon (Pennsylvanian) Reef reservoir, Diamond M field, Texas." Texas A&M University, 2005. http://hdl.handle.net/1969.1/4808.
Повний текст джерелаShiran, M. B. "An investigation of the mode of action of dye/paper method of recording intensity distribution in an ultrasound field." Thesis, University of Aberdeen, 1993. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU059239.
Повний текст джерелаHällstig, Emil. "Nematic Liquid Crystal Spatial Light Modulators for Laser Beam Steering." Doctoral thesis, Uppsala University, Quantum Chemistry, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4693.
Повний текст джерелаLaser beam control is important in many applications. Phase modulating spatial light modulators (SLMs) can be used to electronically alter the phase distribution of an optical wave-front and thus change the direction and shape of a laser beam. Physical constraints set limitations to the SLM and an ideal phase distribution can usually not be realised. In order to understand how such components can be used for non-mechanical beam control three nematic liquid crystal (NLC) SLMs have been thoroughly characterised and modelled.
The pixel structure and phase quantisation give a discrepancy between ideal and realised phase distributions. The impact on beam steering capability was examined by measurements and simulations of the intensity distribution in the far-field.
In two of the studied SLMs the pixel period was shorter than the thickness of the LC layer giving the optical phase shift. This results in a so-called “fringing field”, which was shown to degrade the phase modulation and couple light between polarisation modes. The deformation of the LC was simulated and a finite-difference time-domain (FDTD) algorithm was used to calculate how polarised light propagates through the optically anisotropic SLM.
Non-mechanical beam steering and tracking in an optical free-space communication link were demonstrated. Continual optimisation of the steering angle was achieved by feedback from a video camera.
The optical properties of the SLM in the time period right after a voltage update were studied. It was shown how light is redistributed between orders during the switching from one blazed grating to another. By appropriate choice of the blazed gratings the effects on the diffraction efficiency can be minimised.
The detailed knowledge of the SLM structure and its response to electronic control makes it possible to predict and optimise the device performance in future systems.
Midgarden, David Gunder. "Spatial distribution of western corn rootworm (Diabrotica virgifera virgifera Leconte) trap counts and evaluation of a novel method for sampling soil pests of field corn." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-06302009-040212/.
Повний текст джерелаGriffiths, Georgianne J. K. "The effect of field boundary type on the community structure, spatial distribution and physiological condition of overwintering arthropods, with special reference to Carabidae and Staphylinidae (Coleoptera)." Thesis, University of Plymouth, 2003. http://hdl.handle.net/10026.1/2366.
Повний текст джерелаJiang, Huijing. "Statistical computation and inference for functional data analysis." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37087.
Повний текст джерелаWilsch, Benjamin. "Dispositif de magnétomètres pour la mesure de courant en exploitant les harmoniques d’espace : application aux réseaux électriques." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAT028/document.
Повний текст джерелаThe evolution of electrical grids from conventional unidirectional power transmission to diverse networks with a large variety of electricity consumers and producers requires the development of advanced and/or novel measurement and communication technologies, in order to create smart grids. As a part of the SOGRID project, an innovative current measurement method was developed to supplement the existing range of current sensors and to facilitate the installation, since the sensor is not only non-intrusive but can also be located at a distance from the cable.The primary obstacle for precise current measurement in power grids is the three-phase nature of power transmission. A current sensor that is to be employed in the electrical grid must therefore provide geometrical selectivity between the individual phases. Existing commercial current sensors are non-intrusive but require placement around the conductor of interest, e.g. to measure the field along a closed path. Solutions include Rogowski coils, magnetoresistors, Hall effect or fluxgate sensors as well as magneto-optical solutions. However, a placement around the conductor limits the miniaturization required by smart grid development: miniature sensors can be integrated with other measurement and data transmission units, thus enabling the densely meshed monitoring and control of modern smart grids. In order to avoid these restrictions and to improve geometrical selectivity, a current measurement method based on the decomposition of the field into spatial harmonics has been developed in this thesis. The measurement principle allows for the fabrication of innovative current sensors that can be installed besides the conductor.The decomposition of the magnetic field into spatial harmonics is based on the development of the magnetic field within a defined area/volume in a series of products of periodic functions, a radial dependence and corresponding development coefficients, so that the sum of the (in theory infinite number of) development orders reconstructs the field accurately. If this development is performed for a source-free region besides the source of the field, it is defined as an internal decomposition, which uses functions that increase from the center of decomposition toward the field source. The current measurement process is based on the determination of the development coefficients for the various orders, wherein higher orders exhibit a reduced dependence on perturbing sources (as long as the field measurements are performed closer to the conductor of interest than to the perturbing conductor). The relation between these coefficients and the current of interest is linear and defined by transfer factors.In order to exploit the increased geometrical selectivity of higher orders, it is necessary to perform a sufficient number of magnetic field measurements on the boundary of a suitable area/volume in order to derive the development coefficients from the solution of an inverse problem. The size and positioning of this sensor array also plays a vital role in the detectability of higher order contributions to the field. Suitable 2D (for straight conductors) and 3D (for arbitrary conductor paths) prototypes were designed, implemented and subsequently tested in the laboratory during this thesis.Further developments focus on determining the characteristic transfer factors. While these can be easily determined if a known controlled current is induced in the conductor, a method that allows for their determination under real operating conditions must be developed for industrial applications. A suitable calibration method is presented in this thesis
Yoo, Kyung-Dong. "Two-dimensional dopant profiling for shallow junctions by TEM and AFM." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342122.
Повний текст джерелаDlamini, Wisdom Mdumiseni Dabulizwe. "Spatial analysis of invasive alien plant distribution patterns and processes using Bayesian network-based data mining techniques." Thesis, 2016. http://hdl.handle.net/10500/20692.
Повний текст джерелаEnvironmental Sciences
D. Phil. (Environmental Science)
Chimin, Chiang, and 江啟民. "Spatial distribution of arsenic in a paddy field with arsenic-containing irrigation groundwater." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/28994155026703854602.
Повний текст джерела國立屏東科技大學
環境工程與科學系所
102
The groundwater has higher concentration of arsenic due to geological background of Chianan Plain. Here we aim to understand the relation between geological conditions and As contribution through the investigation of soil properties, and further visualize the spatial distribution of As in a paddy field along with irrigation through the approach of geographic information system (GIS). This study found that total As concentration positivelyand significantly (p<0.05) correlated with the soil properties including Fed, Mnd, Feo, Mno, cation capacity exchange, and clay content. The sequential extraction of soil As showed that As was mainly fixed by both amorphous and crystalline Fe/Mn oxides, which may be ascribable to that As has a high affinity for Fe/Mn oxides under reduction regime of groundwater. As a consequence, As probably would become soluble due to the usage of groundwater and the change of redox regime. Besides, alternating wet and dry could also solubilize As bound to Fe/Mn oxides. Because of the coarse texture of study soil, the flow way of irrigation water, and the gravity impact, the soil arsenic was concentrated on the surface soil, gradually decreased with soil depth, and showed a fan-shaped spatial distribution since the inlet as fan top. . Therefore, total As in subsoils was lower than topsoil because As was adsorbed and accumulated by abundant Fe/Mn oxides in surface soil after irrigation. High pH of subsoils may lead to the dissolution and leaching of As from soil particles so that the concentration of As in subsoils was lower in comparison with topsoils.
Wills, Skye Angela. "The spatial distribution of soil properties and prediction of soil organic carbon in Hayden Prairie and an adjacent agricultural field /." 2005.
Знайти повний текст джерелаLiu, Heng-Jian, and 劉恆鍵. "Field survey on spatial distribution, life history and feeding behavior of Tsudai stick insects, Megacrania tsudai Shiraki (Phasmatodea: Phasmidae), in Taiwan." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/06012268913049348009.
Повний текст джерела國立中興大學
昆蟲學系
90
Tsudai stick insect, Megacrania tsudai Shiraki, is one of the conservative insects in Taiwan. They feed on screwpines, Pandanus odoratissimus L. f.. Our researches focus on spatial distribution, life history and feeding behaviors of them in the field. The spatial distribution was approached by using the catography for the distributions of Tsudai stick insects and their host plants, screwpines along with the coastline of Taiwan during 11 days in July, 2001. The screwpines distribute in 82% and Tsudai stick insects distribute in 5% of total 39 grids. Tsudai stick insects mainly distributed in Ken-Ting National Park and its adjacent area of southern Taiwan. And 86% of Tsudai stick insects’ habitats are closed to the mouth of rivers. We also found them in Lutao and Lanyu, but not in Peng-Hu, Shiau-Liou-Chiou and Turtle Island. The distribution of Tsudai stick insects within a screwpine plant shown that larger ones appeared in the outer layers and the smaller ones in the inner layers. We surveyed the life history of Tsudai stick insects by using body length structure and found that it is clearly to show a complete cycle of life history between March, 2001 and April, 2002. The correlation equation of the body length by the length of front femur for nymphs of Tsudai stick insects are y=3.855x-2.170 (for early instar),. y=3.760x+0.064 (for middle instar) and y=3.923x+1.607 (for final instar). It is convenient and time saving work and good for measuring insect size in the study of life history in the field. The feeding behavior of Tsudai stick insects was recorded by using the nightshot video at night time. After the analyses, we found that the major duration of feeding time of the Tsudai stick insects are at 04:00-06:00 and 18:00-20:00, respectively.
Σακελλάρης, Ταξιάρχης. "Development of a Monte Carlo simulation model of the signal formation processes inside photoconducting materials for active matrix flat panel direct detectors in digital mammography." Thesis, 2008. http://nemertes.lis.upatras.gr/jspui/handle/10889/1315.
Повний текст джерелаThe x-ray induced primary electrons inside the photoconductor of direct conversion digital flat panel mammographic detectors, comprise the primary signal which propagates in the material and forms the final signal (image). Consequently, the quality of the mammographic image strongly depends on the characteristics of primary electrons. An investigation is made concerning the primary signal formation and the characteristics of primary electrons inside a-Se, a-As2Se3, GaSe, GaAs, Ge, CdTe, CdZnTe, Cd0.8Zn0.2Te, ZnTe, PbO, TlBr, PbI2 and HgI2, which are suitable photoconductors for direct detectors. A Monte Carlo model has been developed that simulates the primary electron production inside the materials mentioned for various x-ray spectra in the mammographic energy range. The model simulates the photon interactions and the atomic deexcitations. Furthermore, particularly for a-Se, a preliminary study is made concerning the correlation between the characteristics of primary and final signal, solving Newton’s equations of electron drifting in vacuum under the influence of a simple electric field. For the same material, an algorithm that calculates the electric potential distribution inside the detector from an existing analytical solution has been developed as well as a primitive Monte Carlo model for electron interactions. The most important findings are: (i) the percentage of primary electrons being forwards ejected is approximately 60 % with the most probable polar angles ranging from 50o to 70o, (ii) the electrons prefer to be emitted at two lobes around azimuthal angles φ=0 and π, (iii) approximately 80% of primary electrons are produced at the point of x-ray incidence whereas their majority is produced within the first 300 μm from detector’s surface, (iv) the electron spatial distributions for a-Se, a-As2Se3, GaSe, GaAs, Ge, PbO and TlBr are almost spectral independent while for the rest of materials there is a spectral dependence, (v) at the practical mammographic energies (15-40 keV) and at the primitive stage of signal formation a-Se, a-As2Se3 and Ge have the minimum azimuthal uniformity in electron emission whereas CdZnTe, Cd0.8Zn0.2Te and CdTe the maximum one, a-Se has the best inherent spatial resolution but the minimum number of primary electrons, PbO has the minimum bulk space in which electrons can be produced (radius R=200 μm, depth Dmax=320 μm) whereas CdTe has the maximum one (R=500 μm, Dmax=660 μm), (vi) finally, there is strong evidence indicating that PbI2 and HgI2 could be the best choices for this kind of applications.
Adolph, Inga Winny. "Remote sensing large-scale surface structures in the Wadden Sea. Application of satellite SAR data (TerraSAR-X) to record spatial distribution and dynamics of habitats and geomorphic structures for monitoring and long-term ecological research." Doctoral thesis, 2021. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-202104064249.
Повний текст джерела