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Dissertations / Theses on the topic 'Density'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Ucar, Egemen. "Ternary Nanocomposites Of High Density, Linear Low Density And Low Density Polyethylenes." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608446/index.pdf.

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In this study, the effects of organoclay loading, compatibilizer loading and polyethylene type on the morphology, rheology, thermal properties and mechanical properties of polyethylene/compatibilizer/organoclay nanocomposites were investigated. As compatibilizer, terpolymer of ethylene-methacrylate-glycidyl methacrylate (Lotader&reg<br>AX8900), as organoclay Cloisite&reg<br>15A were used. All samples were prepared by a co-rotating twin screw extruder, followed by injection molding. Considering ternary nanocomposites, highest impact strength results were obtained with 10% compatibilizer plus

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2

Smith, Alyson Rae. "Designing density." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/28147.

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3

Abraham, Jose P. "Density dynamics: a holistic understanding of high density environments." Kansas State University, 2014. http://hdl.handle.net/2097/17308.

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Master of Regional and Community Planning<br>Department of Landscape Architecture/Regional and Community Planning<br>Jason Brody<br>Today, achieving higher residential densities is an integral part of most discussions on concepts such as sustainability, placemaking, smart growth and new urbanism. It is argued that high density environments can potentially improve quality of life through a range of social benefits. In attempting to achieve these benefits, often times, developments that provide more than a certain number of dwelling units are considered desirable and successful high-density deve

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4

FERRERO, PIETRO. "Scalar Filtered Mass Density Function for Variable-Density Flows." Doctoral thesis, Politecnico di Torino, 2012. http://hdl.handle.net/11583/2503979.

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Una metodologia denominata Scalar Mass Filtered Density Function (SFMDF) e’ stata uti- lizzata per condurre Large Eddy Simulation (LES) di flussi turbolenti con reazioni chimiche. La SFMDF descrive la distribuzione delle fluttuazioni di sottoscala delle concentrazioni delle specie chimiche e dell’entalpia. Il grande vantaggio della formulazione SFMDF risiede nel fatto che il termine sorgente che descrive l’effetto delle reazioni chimiche appare in forma chiusa e non deve essere modellato. Il metodo presentato in questa tesi di dottorato si basa sull’equazione di trasporto della SFMDF, che vien

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5

Morganti, Michele. "Sustainable density : form, built environment, energy = Densità sostenibile : forma, ambiente costruito, energia." Doctoral thesis, Universitat Politècnica de Catalunya, 2013. http://hdl.handle.net/10803/365041.

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This research aims at exploring meanings, qualities and analytical abilities of density concept and its potential interpretations in architecture and sustainability fields. Despite the growing unsustainability of today's city facing an effective energy and environmental crisis, recent statistics have confirmed the increasing attractive power of metropolitan areas. Within the context of European compact city, new building models based on energy conservation principles account for an insignificant percentage compared to the great mass of existing city whose functioning remarkably affects the ine

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6

Helbig, Nicole. "Orbital functionals in density-matrix- and current-density-functional theory." [S.l.] : [s.n.], 2006. http://www.diss.fu-berlin.de/2006/442/index.html.

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7

Oliver, Matthew. "Density, temperature and magnetic field measurements in low density plasmas." Thesis, University of Oxford, 2018. http://ora.ox.ac.uk/objects/uuid:df217453-1e10-4684-beb7-83c1bcecf285.

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Low density plasmas are found throughout the known universe. Therefore, accurate diagnostic methods have implications for our understanding of a variety of topics, ranging from star formation to the semi conductor industry. Low density plasmas are ubiquitous in the material processing industry. However, measurements of the electron temperature and density, two of the most fundamental plasma properties, are not straightforward. In the laboratory, we create a low density, radio frequency, helium plasma with a bi-Maxwellian electron distribution, similar to those found in the semiconductor proces

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8

Hultgren, Kristoffer. "Cosmological Density Perturbations." Thesis, Karlstad University, Faculty of Technology and Science, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-925.

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<p>This thesis presents a brief review of gravitation and cosmology, and then gives an overview of the theory of cosmological perturbations; subsequently some applications are discussed, such as large-scale structure formation. Cosmological perturbations are here presented both in the Newtonian paradigm and in two di¤erent relativistic approaches. The relativistic approaches are (i) the metric approach, where small variations of the metric tensor are considered, and (ii) the covariant approach, which focusses on small variations of the curvature. Dealing with these two approaches also involves

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9

Færevåg, Åshild. "Predicting Snow Density." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for matematiske fag, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-20666.

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Snow density is an important measure in hydrological applications. It is used to convert snow depth to the snow water equivalent (SWE). A model developed by Sturm et al. (2010) predicts the snow density by using snow depth, the snow age and a snow class defined by the location. In this work the model is extended to include seasonal weather variables and variables concerning the location. The model is tested and fitted for 4040 Norwegian snow depth and densities measurements in the period $1998-2011$. A Bayesian modeling framework is chosen. To do inference a Markov Chain Monte Carlo method wit

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10

Kelly, Frederick Alan. "Tokamak density limits." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/16628.

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11

Lindberg, Jacob. "Autoregressive Conditional Density." Thesis, Uppsala universitet, Statistiska institutionen, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-302416.

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We compare two time series models: an ARMA(1,1)-ACD(1,1)-NIG model against an ARMA(1,1)-GARCH(1,1)-NIG model. Their out-of-sample performance is of interest rather than their in-sample properties. The models produce one-day ahead forecasts which are evaluated using three statistical tests: VaR-test, VaRdur-test and Berkowitz-test. All three tests are concerned with the the tail events, since our time series models are often used to estimate downside risk. When the two models are applied to data on Canadian stock market returns, our three statistical tests point in the direction that the ACD mo

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12

Ersoz, Ali. "Magnetic Resonance Current Density Imaging Using One Component Of Magnetic Flux Density." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612164/index.pdf.

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Magnetic Resonance Electrical Impedance Tomography (MREIT) algorithms using current density distribution have been proposed in the literature. The current density distribution can be determined by using Magnetic Resonance Current Density Imaging (MRCDI) technique. In MRCDI technique, all three components of magnetic flux density should be measured. Hence, object should be rotated inside the magnet which is not trivial even for small size objects and remains as a strong limitation to clinical applicability of the technique. In this thesis, 2D MRCDI problem is investigated in detail and an analy

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13

Eldrot, Johan. "Fragments, emptiness and density." Thesis, Konstfack, Institutionen för Konst (K), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:konstfack:diva-2985.

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During the last three years, my practice has mainly consisted of installation works; compositions of images, texts, video, constructions, produced and found objects, drawings etcetera. This thesis serves to present an overview of my practice during these three years, to contextualize my work and work method and to discuss my future artistic intentions.

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14

Wong, Man Kin. "High-density courtyard houses." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ63566.pdf.

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15

Wang, Xiaoxia. "Manifold aligned density estimation." Thesis, University of Birmingham, 2010. http://etheses.bham.ac.uk//id/eprint/847/.

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With the advent of the information technology, the amount of data we are facing today is growing in both the scale and the dimensionality dramatically. It thus raises new challenges for some traditional machine learning tasks. This thesis is mainly concerned with manifold aligned density estimation problems. In particular, the work presented in this thesis includes efficiently learning the density distribution on very large-scale datasets and estimating the manifold aligned density through explicit manifold modeling. First, we propose an efficient and sparse density estimator: Fast Parzen Wind

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16

Leydold, Josef, and Wolfgang Hörmann. "Smoothed Transformed Density Rejection." Department of Statistics and Mathematics, Abt. f. Angewandte Statistik u. Datenverarbeitung, WU Vienna University of Economics and Business, 2003. http://epub.wu.ac.at/228/1/document.pdf.

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There are situations in the framework of quasi-Monte Carlo integration where nonuniform low-discrepancy sequences are required. Using the inversion method for this task usually results in the best performance in terms of the integration errors. However, this method requires a fast algorithm for evaluating the inverse of the cumulative distribution function which is often not available. Then a smoothed version of transformed density rejection is a good alternative as it is a fast method and its speed hardly depends on the distribution. It can easily be adjusted such that it is almost as good as

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17

Rademeyer, Estian. "Bayesian kernel density estimation." Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/64692.

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This dissertation investigates the performance of two-class classi cation credit scoring data sets with low default ratios. The standard two-class parametric Gaussian and naive Bayes (NB), as well as the non-parametric Parzen classi ers are extended, using Bayes' rule, to include either a class imbalance or a Bernoulli prior. This is done with the aim of addressing the low default probability problem. Furthermore, the performance of Parzen classi cation with Silverman and Minimum Leave-one-out Entropy (MLE) Gaussian kernel bandwidth estimation is also investigated. It is shown that the n

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18

Wu, Di. "High Density Residential Design." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/76679.

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Massive migration is one the most significant phenomena of China's urbanization. In the thirty years since the "Reform and Open Up" policy began, Guangzhou has experienced economic growth and urban expansion and attracted a vast number of migrants. Seen as the product of the rapid urbanization, urban villages accommodate the majority of migrants by providing low-rent housing, but at the same time cause many social problems. This thesis aim at improving the migrants' standard of living, helping them gradually integrate into the city, and enhancing the potential for social interactions in th

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19

Lambert, Hendrick C. "Interstellar electron density spectra /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1998. http://wwwlib.umi.com/cr/ucsd/fullcit?p9901445.

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20

Bowen, Lewis Phylip. "Density in hyperbolic spaces." Access restricted to users with UT Austin EID Full text (PDF) from UMI/Dissertation Abstracts International, 2002. http://wwwlib.umi.com/cr/utexas/fullcit?p3077409.

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21

Stride, Christopher B. "Semi-parametric density estimation." Thesis, University of Warwick, 1995. http://wrap.warwick.ac.uk/109619/.

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The local likelihood method of Copas (1995a) allows for the incorporation into our parametric model of influence from data local to the point t at which we are estimating the true density function g(t). This is achieved through an analogy with censored data; we define the probability of a data point being considered observed, given that it has taken value xi, as where K is a scaled kernel function with smoothing parameter h. This leads to a likelihood function which gives more weight to observations close to t, hence the term ‘local likelihood’. After constructing this local likelihood functio

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22

Albarakati, Rayan. "Density Based Data Clustering." CSUSB ScholarWorks, 2015. https://scholarworks.lib.csusb.edu/etd/134.

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Data clustering is a data analysis technique that groups data based on a measure of similarity. When data is well clustered the similarities between the objects in the same group are high, while the similarities between objects in different groups are low. The data clustering technique is widely applied in a variety of areas such as bioinformatics, image segmentation and market research. This project conducted an in-depth study on data clustering with focus on density-based clustering methods. The latest density-based (CFSFDP) algorithm is based on the idea that cluster centers are characteriz

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23

Isik, Coskunses Fatma. "Ternary Nanocomposites Of Low Density,high Density And Linear Low Density Polyethylenes With The Compatibilizers E-ma_gma And E-ba-mah." Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613294/index.pdf.

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The effects of polyethylene, (PE), type, compatibilizer type and organoclay type on the morphology, rheological, thermal, and mechanical properties of ternary low density polyethylene (LDPE), high density polyethylene (HDPE), and linear low density polyethylene (LLDPE), matrix nanocomposites were investigated in this study. Ethylene &ndash<br>Methyl acrylate &ndash<br>Glycidyl methacrylate terpolymer (E-MAGMA) and Ethylene &ndash<br>Butyl acrylate- Maleic anhydrate terpolymer (E-BA-MAH) were used as the compatibilizers. The organoclays selected for the study were Cloisite 30B and Nanofil 8. Na

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24

Schittenkopf, Christian, and Georg Dorffner. "Risk-neutral density extraction from option prices. Improved pricing with mixture density networks." SFB Adaptive Information Systems and Modelling in Economics and Management Science, WU Vienna University of Economics and Business, 2000. http://epub.wu.ac.at/1682/1/document.pdf.

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One of the central goals in finance is to find better models for pricing and hedging financial derivatives such as call and put options. We present a semi-nonparametric approach to risk-neutral density extraction from option prices which is based on an extension of the concept of mixture density networks. The central idea is to model the shape of the risk-neutral density in a flexible, non-linear way as a function of the time horizon. Thereby, stylized facts such as negative skewness and excess kurtosis are captured. The approach is applied to a very large set of intraday options data on the F

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25

Lekea, Angella. "Evaluation of the electrical density gauge for in-situ moisture and density determination." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/24301.

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Densification of soil during construction of earth structures is achieved through the process of compaction by application of mechanical energy to obtain the required engineering properties of the soil for a particular project such as hydraulic conductivity, soil strength and compressibility. These properties are dependent on attainment of high compaction densities normally achieved at specific moisture contents for a given compactive effort. The optimum moisture content and maximum dry density for a particular soil is determined by means of Proctor tests in the laboratory. A relative compacti

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26

Dal, Corso Andrea. "Density-functional theory beyond the pseudopotential local density approach: a few cases studies." Doctoral thesis, SISSA, 1993. http://hdl.handle.net/20.500.11767/4059.

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27

Johansson, Hanna, and Katarina Walter. "In-Vehicle Screen Density : Driver distraction and User Preferences for Low vs High Screen Densisty." Thesis, Linköping University, Department of Computer and Information Science, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-4336.

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<p>Many information technology artefacts can be found in today’s cars. The interaction with these artefacts is the driver’s secondary task while driving the car in a safe way is the primary task. When designing interfaces for in-vehicle usage, measures have to be taken in order to make the interaction with the artefact suit the in-vehicle environment. One of these measures is to have the appropriate screen density level, which is the amount of information present on the screen.</p><p>This thesis compares the usability of two integrated in-vehicle display prototypes, one with low screen density

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28

Remenyi, Christian. "Density functional studies on EPR parameters and spin-density distributions of transition metal complexes." Doctoral thesis, [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=982187890.

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29

Sasaki, K., Y. Kawai, C. Suzuki, and K. Kadota. "Absolute density and reaction kinetics of fluorine atoms in high-density c-C_4F_8 plasmas." American Institute of Physics, 1998. http://hdl.handle.net/2237/7029.

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30

Cappello, Christian. "Ozoniertes Low Density-Lipoprotien (OzLDL)." kostenfrei, 2009. http://mediatum2.ub.tum.de/node?id=679935.

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31

Hyder, Joseph Anthony. "Systemic atherosclerosis and bone density." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2006. http://wwwlib.umi.com/cr/ucsd/fullcit?p3211934.

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Thesis (Ph. D.)--University of California, San Diego and San Diego State University, 2006.<br>Title from first page of PDF file (viewed June 21, 2006). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 121-139).

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32

Schweigert, Igor Vitalyevich. "Ab initio Density Functional Theory." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0011614.

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33

Weinroth, Aaron Phillip. "Variable frequency current density imaging." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0006/MQ40957.pdf.

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34

Kutyniok, Gitta. "Affine density in wavelet analysis /." Berlin [u.a.] : Springer, 2007. http://www.gbv.de/dms/ilmenau/toc/529512874.PDF.

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35

Cowan, Ian Robert. "Density-stratified turbulent boundary layers." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321001.

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36

Laming, Gregory John. "Density functional theory for molecules." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336907.

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37

Rossiter, Jane E. "Epidemiological applications of density estimation." Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.291543.

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38

Cheng, B. K. "Human perception of urban density." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597570.

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Is it possible to increase physical density whilst limiting the perception of density? This thesis outlines the main determinants of perceived urban density, exploring alternative parameters to those commonly used to define density. The study uses Hong Kong as an urban case study. Findings suggest high perceived density is seen as a negative aspect of urban life in Hong Kong. To create a satisfactory urban environment, means of reducing the perception of density are welcome. A number of candidate urban parameters were investigated and their effects on the perception of density are discussed. P

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39

Gilbert, A. T. B. "Density methods in quantum chemistry." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.599402.

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Density functional theory (DFT) has become a central aspect of quantum chemistry and provides the mainstay of chemical calculations. The advantage of DFT methods lies in their relatively inexpensive computational cost and their dealing with an experimentally tangible quantity, i.e. the density. The chief drawback is its lack of well-defined path from approximation to exactitude. Consequently many models and approaches have emerged, and been enthusiastically advocated, often with little more justification than "it works". This thesis begins with an overview of traditional quantum chemical theor

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40

Chan, G. K. L. "Aspects of density functional theory." Thesis, University of Cambridge, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597413.

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The first part of our work, we describe investigations into the formal and conceptual aspects of density functional theory. These have been in four main areas. The first, is the theory of the derivative discontinuity, where we extended the theory to density matrix functionals, and carried out calculations of the effects of the discontinuity. Our second investigation concerned a new channel concept, namely, the shape and local chemical potentials. These describe the electron donating or accepting power of a density fragment. We demonstrated in simple model systems, that chemical features such a

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41

Gaspar, Luis Alejandro Ladino. "CHARGE DENSITY WAVE POLARIZATION DYNAMICS." UKnowledge, 2008. http://uknowledge.uky.edu/gradschool_diss/643.

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We have studied the charge density wave (CDW) repolarization dynamics in blue bronze (K0.3MoO3) by applying symmetric bipolar square-wave voltages of different frequencies to the sample and measuring the changes in infrared transmittance, proportional to CDW strain. The frequency dependence of the electro-transmittance was fit to a modified harmonic oscillator response and the evolution of the parameters as functions of voltage, position, and temperature are discussed. We found that resonance frequencies decrease with distance from the current contacts, indicating that the resulting delays are

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42

Tong, Tung, and 唐東. "Residential density and building planning." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1994. http://hub.hku.hk/bib/B31259030.

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吳永輝 and Wing-fai Ng. "Density control in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1991. http://hub.hku.hk/bib/B31257811.

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Larsson, Johan P. "Nonmarket Interactions and Density Externalities." Doctoral thesis, Internationella Handelshögskolan, Högskolan i Jönköping, IHH, Economics, Finance and Statistics, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-23661.

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The four individual papers in this thesis all explore some aspect of the relationship between productivity and the density of economic activity. The first paper (co-authored with Martin Andersson, and Johan Klaesson) establishes the general relationship between regional density and average labor productivity; a relationship that is particularly strong for workers in interactive professions. In the paper, we also caution that much of the observed differences are not causal effects of density, but driven by sorting of actors to dense environments. Paper number two (co-authored with Martin Anders

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Guo, Feng. "Low density parity check coding." Thesis, University of Southampton, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419159.

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Apraiz, Jose Manuel Redondo. "The structure of density interfaces." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317855.

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Ironside, Alastair J. "Molecular mediators of mammographic density." Thesis, Queen Mary, University of London, 2017. http://qmro.qmul.ac.uk/xmlui/handle/123456789/25898.

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Mammographic density (MD), created predominantly by increased stromal tissue, is a major breast cancer risk factor, though little is known about the biological mechanisms mediating it. Tamoxifen prevents breast cancer in a subset of high risk women via mechanisms that appear dependent on reduction of MD. Animal models suggest tamoxifen remodels the mammary stroma to a tumour-inhibitory phenotype. This study aims to analyse the effect of tamoxifen on human breast fibroblast function and identify pro-tumourigenic pathways contributing to density-associated risk. Methods Primary human breast fibr

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48

Martin, Adrian. "Density bounds and tangent measures." Thesis, University of Sussex, 2013. http://sro.sussex.ac.uk/id/eprint/45279/.

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A major theme in geometric measure theory is establishing global properties, such as rectifiability, of sets or measures from local ones, such as densities or tangent measures. In establishing sufficient conditions for rectifiability it is useful to know what local properties are possible in a given setting, and this is the theme of this thesis. It is known, for 1-dimensional subsets of the plane with positive lower density, that the tangent measures being concentrated on a line is sufficient to imply rectifiability. It is shown here that this cannot be relaxed too much by demonstrating the ex

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49

Maclaren, James Martin. "Charge density at catalyst surfaces." Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/38090.

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Son, Nguyen Thanh. "Density perturbations in hybrid inflation." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/85770.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Physics, 2009.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (page 35).<br>Inflation is a substantial modification to the big bang theory, and supernatural inflation is a hybrid inflation motivated from supersymmetry. In this thesis we carry out a one dimensional numerical simulation to verify the untested analytic approximation of Radall et al. The results show a good agreement for a wide range of parameters. We also propose a new method for calculating density perturbations in hybrid inflatio

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