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1
Sciumè, Giuseppe. "Thermo-hygro-chemo-mechanical model of concrete at early ages and its extension to tumor growth numerical analysis". Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2013. http://tel.archives-ouvertes.fr/tel-00907395.
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The aim of the PhD thesis has been the development of two multi-physics models based on common theoretical basis, but applied to two very different areas: i) the study of the behavior of concrete at early age, essentially for the prevention of early cracking and related issues- ii) the analysis of physical, chemical and biological processes that govern growth and development of cancer. The development of a numerical tool to model concrete at early age is of great importance for the design of durable and sustainable structures. The model has been implemented on the finite element code CAST3M (developed by CEA), also it was validated and nowadays allows multiple applications: study of stresses and cracking phenomena in young concrete, thermal and hygral gradients, autogenous and drying shrinkage, inhibition of hydration caused by drying, creep, stress redistribution, study repairs, etc.. In the fight against cancer, it is clear that the advance of medical strategies based on numerical analysis have a critical scientific interest and can have a great social impact. The equations which govern the thermo-hydro-chemo-mechanical behavior of concrete at early age have may formal analogies with those used to model tumor growth. Hence, these equations have been readapted and a novel mathematical model for tumor growth has been developed. The model was implemented in Cast3M and the first numerical results have been encouraging since very close to the experimental data present in the literature.
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Travouillon, Kenny James Biological Earth & Environmental Sciences Faculty of Science UNSW. "Palaeoecological and biochronological studies of Riversleigh, world heritage property, Oligo-Miocene fossil localities, north-western Queensland, Australia". Publisher:University of New South Wales. Biological, Earth & Environmental Sciences, 2008. http://handle.unsw.edu.au/1959.4/41305.
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Riversleigh, World Heritage Property, located in North-western Queensland, Australia, contains over 200 fossil bearing localities from the Oligo-Miocene. The study presented here aims at finding new methods to improve the accuracy of palaeoecological and biochronological studies and describe the palaeoenvironmental and chronological settings of the Riversleigh fossil deposits. One of the methods developed in this thesis, Minimum Sample Richness (MSR), determines the minimum number of species that must be present in a fauna to allow meaningful comparisons using multivariate analyses. Using MSR, several Riversleigh localities were selected for a palaeoecological study using the cenogram method to determine the palaeoenvironment during the Oligo-Miocene. Finally, the Numerical ages method was used to refine the relative ages of the Riversleigh localities and a re-diagnosis of the Riversleigh Systems is proposed.
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Deparis, Nicolas. "Etude numérique de l'époque de réionisation avec le code de simulation EMMA". Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAE047/document.
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L’époque de réionisation (EoR) est une phase de grands changements qu’a subit l’Univers dans son premier milliard d’années. Suite à l’apparition des premières étoiles et à l’émission de photons énergétique par ces dernières, l’hydrogène a été réionisé. Cette transition a eu un impact sur la formation des galaxies. J’ai activement participé au développement d’EMMA, un code de simulation numérique ayant pour objectif d’étudier les processus à l’œuvre durant l’EoR. J’ai développé et implémenté un modèle de formation et d’évolution stellaire. Ces travaux ont contribué à la réalisation d’une simulation dédiée à l’étude de l’EoR parmi les plus grosses réalisées à l’heure actuelle. J’ai contribué au développement d’outils dédiés à l’exploration de simulations de ce type. J’ai étudié la façon dont le rayonnement s’échappe des galaxies en fonction des paramètres du modèle stellaire, et montré que les supernovæ peuvent augmenter la fraction de photons libérés. J’ai également étudié la propagation des fronts d’ionisation et montré qu’il était possible de réduire la vitesse de la lumière par trois (et ainsi diminuer le temps de calcul du transfert du rayonnement par 3), tout en conservant des résultats corrects ?The epoch of reionization (EoR) is a phase of big changes in the first billion years of the Universe history. After the apparition of the first stars and the emission of energetic radiation by thoses ones, the hydrogen was reionized. This transition has an impact on the galaxies formations. I was part of the development team of EMMA, a numerical simulation code who aimed to study the processes happening during the EoR. I developed and implement a stellar formation and evolution model. These works contributed to the realisation of one of the biggest simulation dedicated to the study of the EoR yet. I contribute to the development of a tool dedicated to the exploration of this kind of simulations. I study how the radiation escaped the galaxies as a function of the parameters of the stellar model, and showed that supernovae could increase the ratio of escaping photon. I also studied the ionization fronts propagation and showed that the speed of light could be reduced by a factor 3 (and then divide the computational cost of the radiative transfer by 3), while keeping corrects results
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Pawlik, Andreas H., Alireza Rahmati, Joop Schaye, Myoungwon Jeon i Vecchia Claudio Dalla. "The Aurora radiation-hydrodynamical simulations of reionization: calibration and first results". OXFORD UNIV PRESS, 2017. http://hdl.handle.net/10150/623851.
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We introduce a new suite of radiation- hydrodynamical simulations of galaxy formation and reionization called Aurora. The Aurora simulations make use of a spatially adaptive radiative transfer technique that lets us accurately capture the small- scale structure in the gas at the resolution of the hydrodynamics, in cosmological volumes. In addition to ionizing radiation, Aurora includes galactic winds driven by star formation and the enrichment of the universe with metals synthesized in the stars. Our reference simulation uses 2 x 512(3) dark matter and gas particles in a box of size 25 h(-1) comoving Mpc with a force softening scale of at most 0.28 h(-1) kpc. It is accompanied by simulations in larger and smaller boxes and at higher and lower resolution, employing up to 2 x 1024(3) particles, to investigate numerical convergence. All simulations are calibrated to yield simulated star formation rate functions in close agreement with observational constraints at redshift z = 7 and to achieve reionization at z approximate to 8.3, which is consistent with the observed optical depth to reionization. We focus on the design and calibration of the simulations and present some first results. The median stellar metallicities of low- mass galaxies at z = 6 are consistent with the metallicities of dwarf galaxies in the Local Group, which are believed to have formed most of their stars at high redshifts. After reionization, the mean photoionization rate decreases systematically with increasing resolution. This coincides with a systematic increase in the abundance of neutral hydrogen absorbers in the intergalactic medium.
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Kogel, John 1981. "Multi-parametric numerical simulation of age-specific cancer rates in human populations". Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28432.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004.Includes bibliographical references (p. 138).
The CancerFit computer program allows cancer researchers to analyze epidemiologic data describing the age-specific risk of cancer in terms of hypotheses about historical environmental risks, the heritability of cancer, the role of gender and the processes embedded in cancer formation. The program was based on the theories of Professor W. Thilly (MIT), Professor S. Morgenthaler (ETH) and their students. Written as a Fortran program by Prof. Morgenthaler it was transported into Java by David Hensle (MIT) who introduced a number of characteristics that enabled MIT students to perform basic parametric analyses for thesis and coursework in cancer epidemiology. In this thesis, the CancerFit application has been extended to include new functionality that allows computation and subsequent analysis of the ratio of two age-specific cancer incidence or mortality datasets. Originally this ratio was proposed to compare the lifetime risks of children of parents with a specific form of cancer and of parents with at least one child with the same cancer; it does this task as intended. However, its use has permitted me to discover a previously unrecognized excess of colon cancer deaths in women relative to men in the 30-64 year age interval. As this is the same age interval for early breast cancer and ovarian cancer onset in women, this finding points to a more general cancer risk in pre-menopausal women than has been previously recognized. Furthermore, the CancerFit program has been improved by permitting the cancer researcher to include historical age-specific survival rates, overall mortality rates, and reporting error rates when these are available. A user can now input data for each of these rates, which the program uses to adjust the mortality data
(cont.) to better approximate the age-specific rate of cancer appearance for the cohort studied. These improvements and new clinical data have permitted a clearer understanding of the age-specific risks and in the case of colorectal cancer appear to permit calculation of the critical parameters in this form of human cancer.
by John Kogel.
M.Eng.
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Alawneh, Zakaria Mohammad. "A numerical method for solving certain nonlinear integral equations arising in age-structured populations dynamics". Diss., The University of Arizona, 1990. http://hdl.handle.net/10150/184984.
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In this thesis we study the existence and stability of positive equilibrium of a general model for the dynamics of several interacting, age-structured population. We begin with the formulation and proof of a global existence theorem for the initial value problem. The proof of this theorem is used to develop an algorithm and a FORTRAN code for the numerical solution of initial value problems for the single species case. This computer program is used to study prototype models for the dynamics of a population whose fertility and mortality rates exhibit an "Allee effect". This is done from a bifurcation theoretic point of view, using the inherent net reproductive rate as a bifurcating parameter. An unstable "left" bifurcation is found. Multi-equilibria and various kinds of oscillations are studied as a function of r, the fertility window, and the nature of the density dependence.
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Ogbagaber, Semhar. "A NUMERICAL METHOD FOR ESTIMATING THE VARIANCE OF AGE AT MAXIMUM GROWTH RATE IN GROWTH MODELS". VCU Scholars Compass, 2010. http://scholarscompass.vcu.edu/etd/94.
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Most studies on maturation and body composition using the Fels Longitudinal data mention peak height velocity (PHV) as an important outcome measure. The PHV is often derived from growth models such as the triple logistic model fitted to the stature (height) data. The age at PHV is sometimes ordinalized to designate an individual as an early, average or late maturer. In theory, age at PHV is the age at which the rate of growth reaches the maximum. Theoretically, for a well behaved growth function, this could be obtained by setting the second derivative of the growth function to zero and solving for age. Such a solution would obviously depend on the parameters of the growth function. An estimate of the age at PHV would be a function of estimates of these parameters. Since the estimates of age at PHV are ultimately used as a predictor variable for analyzing adulthood outcomes, the uncertainty in the estimation of the PHV inherent due to the uncertainty in the estimation of the growth model need to be accounted for. The asymptotic s.e. of the age at maximum velocity in simple growth models such as the logistic and the Gompertz models could be explicitly obtained because explicit formulas for the age at maximum velocity are available. In this thesis a numerical method is proposed for computing the s.e. of the age at PHV for those that do not lead to explicit solutions for the age at PHV. The accuracy of this method is demonstrated by computing the s.e. using the explicit method as well as the proposed numerical methods and by comparing them. Incorporating the estimates of the s.e. in regression models that use age at PHV as predictor is illustrated using the FELS data.
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Anderson, Ursula S. "Aging, relative numerousness judgments, and summation in Western Lowland gorillas". Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/7942.
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Three experiments were conducted to evaluate the relation between age, relative numerousness judgments, and summation in Western lowland gorillas. The findings indicated that most of the gorillas did not perform relative numerousness judgments until after specific training to do so. However, the gorillas did perform summation without specific training and an age-related difference was apparent.
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Soltani, Sofie Safeyeh. "Hydrological Transport in Shallow Catchments: : tracer discharge, travel time and water age". Doctoral thesis, KTH, Skolan för arkitektur och samhällsbyggnad (ABE), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-214971.
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This focuses on hydrological transport in shallow catchments with topography-driven flow paths. The thesis gives new insight to kinematic pathway models for estimation of tracer discharge at the catchment outlet. A semi-analytical methodology is presented for transient travel time and age distributions referred to as "kinematic pathway approach“(KPA) that accounts for dispersion at two levels of morphological and macro-dispersion. Macro-dispersion and morphological dispersion components are reflected in KPA by assuming an effective Péclet number and topographically driven pathway length distributions, respectively. The kinematic measure of the transport, defined as a characteristic velocity of water flow through the catchment is obtained from the overall water balance in the catchment. To include transformation process in its simplest form of linear decay/degradation a framework is presented that solves one-dimensional reactive transport with numerically simulated travel times as the independent variable. The proposed KPA and coupled transport framework for quantifying tracer discharge at the shallow catchment outlet are applied to two selected catchments in Sweden. KPA is applied to modeling of a 23-year long chloride data series for the Kringlan catchment whereas the implantation of the framework for quantifying natural attenuation is illustrated for the Forsmark catchment. Numerical simulations of Forsmark catchment advective travel times are obtained by means of particle tracking using the fully-integrated flow model MIKE SHE. The KPA is found to provide reasonable estimates of tracer discharge distribution when considering the transport controlled by hillslope processes associated with short topographically driven flow paths to adjacent discharge zones, e.g. rivers and lakes. Simulated natural attenuation for Forsmark is also estimated well provided that the pathway length distribution is skewed toward short pathway lengths. This fact is indicative of the controlling impact of topography on flow path length and travel time distributions in shallow catchments. Our work has shown that the pathway (Lagrangian) methodologies are promising as predictive tools for hydrological transport.QC 20170928
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Assude, Teresa. "Un phénomène d'arrêt de la transposition didactique : écologie de l'objet "racine carrée" et analyse du curriculum". Grenoble 1, 1992. http://www.theses.fr/1992GRE10190.
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La notion de racine carree figure en bonne place dans l'enseignement des mathematiques au college ou elle s'est acquis la reputation d'etre une notion difficile, sinon quelque peu rebutante. L'objet de ce travail est d'identifier les differents aspects de la difficulte signalee. Nous montrons en particulier que cette difficulte s'explique dans une large mesure par un phenomene d'arret de la transposition didactique, culturellement surdetermine, qui a conduit a agglutiner autour de la notion de racine carree, de maniere en partie arbitraire, un certain nombre de themes d'etude traites pour cela de maniere inadequate: irrationalite; approximations numeriques; algebre des radicaux. Ces artefacts s'evanouissent des lors que l'on considere, en rupture avec la tradition d'enseignement qui subsiste encore aujourd'hui, l'objet racine carree comme une fonction, parmi tout un ensemble de fonctions elementaires, depuis les fonctions lineaires et affines jusqu'aux fonctions transcendantes elementaires (fonctions trigonometriques, logarithmiques et exponentielles, etc. ) etudiees au lycee. C'est precisement cette organisation conceptuelle et technique unitaire qui fait defaut aujourd'hui dans le curriculum de l'enseignement secondaire. Le travail presente propose a cet egard quelques-unes des lignes de force possible pour une reprise de la transposition didactique sur les themes etudies
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Sakamoto, Kathia. ""Estudo dopplervelocimétrico das artérias uterinas em três períodos de gestações normais"". Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/5/5139/tde-03102005-152401/.
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Estudo longitudinal, prospectivo, comparativo de avaliação dopplervelocimétrica das artérias uterinas direita e esquerda em 37 gestantes normais em três períodos da gestação, acompanhadas na Clínica Obstétrica do HCFMUSP. Análise da relação S/D, índice de pulsatilidade e índice de resistência, relação com o número de incisuras e com posição da placenta. Foi observada redução nos valores dos índices durante a gestação. A relação S/D AUTE com placenta a direita apresentou média superior. A incidência de incisura foi maior no período entre a 16ª e a 24ª semana de gestação. A análise da relação entre os índices dopplervelocimétricos e a presença de incisura não teve resultados significativosProspective, longitudinal, comparative study of Doppler evaluation of the right and left uterine arteries of 37 healthy women with singleton pregnancies, performed in three periods of pregnancy, at the Pre-Natal Care Unit HCFMUSP. S/D ratio, pulsatility index and resistance index, number of notches and placental position were analysed. A decrease in the indices was observed with advancing gestation. When placenta was on the right side, the left uterine artery S/D ratio showed increased mean values. The incidence of uterine notch was higher between the 16th and 24th week of gestation in both arteries. No correlation was found between the presence of uterine notch and the placental position
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Azenha, Miguel Ângelo Dias. "Numerical simulation of the structural behaviour of concrete since its early ages". Tese, 2009. http://hdl.handle.net/10216/57587.
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Azenha, Miguel Ângelo Dias. "Numerical simulation of the structural behaviour of concrete since its early ages". Doctoral thesis, 2009. http://hdl.handle.net/10216/57587.
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Shyu, Chase Jhih-Huang, i 徐志煌. "The Thermal-Mechanical Evolution of Middle Hsuehshan Range, Taiwan: Using Numerical Modeling and Zircon Fission Track Ages". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/02857469584427206621.
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碩士國立臺灣大學
地質科學研究所
102
Located in northern Taiwan, the Hsuehshan Range is the second largest range and has its own special lithology, structural and thermochronological features with high exhumation rate. In most previous studies of forward modeling of Taiwan mountain building, however, the existence of the Hsuehshan Range was ignored. Its thermal-mechanical evolution should be investigated in addition to the evolution of Taiwan mountain range. Moreover, in the aspect of thermochronology, most of the previous studies that discussed the age-elevation relationship do not consider the effect of cooling rate on closure temperature. In this study, we simulate this effect numerically and discuss local exhumation rate in middle Hsuehshan Range using six new zircon fission track ages together with previously published data via the 1-D thermal advection-diffusion model. Furthermore, for the purpose of applying the cooling-rate-closure-temperature relationship to 2-D model and testing the assumption of the initial tectonic framework of the Hsuehshan Range, we simulate the formation of the Hsuehshan Range by introducing the 2-D thermal-mechanical model and compared the modeling predictions with real geochemical data. In the 1-D model, we found a unique phenomenon that we call "Wide-zoned Closure" in the initial stage of orogen. The Wide-zoned Closure signature will induce a spatially vertical zone with similar thermochronological ages. As a result, a vertical profile of thermal age would show a slowly decreasing age trend. By regulating parameters reasonably, the best-fitting 1-D model to the thermochronological data in middle Hsuehshan Range suggests that this area started to exhume with a rate of 5.0 km/Myr around 3.1 Ma. On the other hand, the 2-D modeling results imply that the initial lithology setting would influence the deformation behavior of orogen and result in different distribution of thermo-chronological ages. Additionally, the results suggest that the Hsuehshan Range has inherited influence from the Hsuehshan Basin and that the eastern part of the Hsuehshan Range was an active deformation zone in initial stage of orogen.
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HUANG, CHENG-JIA, i 黃承加. "Numerical Simulation of Middle Crustal Flow And Formation of The Danba Anticline: Constrained by Apatite And Zircon Fission Track Ages". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/am5y2k.
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碩士國立中正大學
地震研究所
104
We applied a finite difference method to simulate the thermal evolution of the Danba Anticline, Sichuan, China. The anticline is located to the northwest of the Sichuan Basin within the Songpan-Ganzi orogen. Because the fold axis of the anticline is subparallel to the direction of the surface compression, buckling is unlikely the mechanism responsible for the growth of the Danba Anticline. We suspect that the formation of the Danba Anticline in Cenozonic period may be related to the middle crustal flow. The sharp change in GPS velocity field near the Sichuan Basin implies that the ductile middle crust materials flow around the relatively rigid Sichuan Basin. As a result, the velocity fields between the upper crust and middle crust are different. In this study, we employed the corner flow model to estimate the velocity and direction of middle crust flow in Danba area. We found that the direction of the middle crust flow is nearly perpendicular to the fold axis of the Danba Anticline. This finding confirms that the growth of the Danba Anticline may result from injection of the middle crust materials, which are driven by the uprising Tibet, beneath the Danba Anticline. We used the apatite and zircon fission track ages across the Danba Anticline as our model constraints. With that we can simulate the thermal history of the Danba Anticline by solving thermo-kinematic equations for detachment folding and calculated the corresponding fission track ages. According to our results, the velocity of middle crust increased with time in Cenozoic (<25Ma), and the thickness of the middle crust channel is about 14 km, the width of the anticline is about 140 km, and the amount of exhumation in the hinge of the Danba Anticline is about 19 km, which agrees with the amount of exhumation (17~26 km) estimated by geobarometry upon a Mesozoic decollement.
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Kugar, Jennifer R. (Jennifer Reis) 1960. "Correlation between caries prevalence, socioeconomic status, and cultural findings in Hispanic children ages 6 months to 8 years". Thesis, 2002. http://hdl.handle.net/1805/3689.
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Indiana University-Purdue University Indianapolis (IUPUI)There has been a tremendous influx in the number of Hispanic immigrants into the US over the past couple of decades. Many newcomers have families with small children, and dental needs in this pediatric population are disproportionately high. The purpose of this study was to determine if there was any correlation between the increased prevalence of caries and socioeconomic or cultural factors in Hispanic children ages six months to eight years old. To accomplish this, 127 children were given dental examinations by a calibrated dental examiner, and their parents completed a two-page questionnaire with questions regarding socioeconomic factors, den1ographics, and cultural issues. The bivariate relation between caries status and demographic and cultural variables was examined using chi-square tests or Fisher's exact tests for categorical variables and logistic regression for continuous variables. Bivariate relation between defs and demographic and cultural variables was examined using analysis of variance (ANOVA). The mean defs for children up to age two was 1.53; ages two to five the mean defs was 7.73, and for ages six to eight, 9.18. As the prevalence of caries increases with age, the child is more likely to access dental care, but despite this, there is an overall mean 79 percent of untreated decay (of decayed, missing and filled surfaces). In the permanent dentition, the overall mean DMFS was found to be 2.22. There were several factors found to be statistically significant to the incidence of defs. If the child had dental insurance, the child was more likely to have higher defs. If a child had more siblings, the defs score was higher. If the child was on the bottle at less than age one-and-a-half, the child was less likely to have dental caries. If the child on the bottle was older than age one-and-a-half, the child was much more likely to have dental caries. The older the child is when the child goes off the bottle, the more likely the child will have a higher caries experience. There is an extraordinarily large number of untreated caries found in Hispanic children. The reasons for this are multifactorial, but involve cost, language barriers, being new to the area, and not having seen a dentist yet. Identifying those at high risk such as single mothers, those with increased numbers of siblings, and infants that are still on the bottle, or older children that are at increased jeopardy due to prolonged use of the bottle are important factors in treating those that are underserved. Local dental and community organizations could benefit from being apprised of the unmet dental need of Hispanic children and some of the contributing factors. By further investigating and understanding some of the socioeconomic and cultural issues that present barriers to care, treatment might become more accessible and available. Adverse outcomes such as missed school and opportunities for acculturation, inadequate nutrition, pain, and infection might be avoided or diminished.
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Patini, Anthony. "Numerical analysis of temperature development in concrete at an early age". Thesis, 2012. http://hdl.handle.net/10539/11200.
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The exothermic reaction associated with hydrating Portland Cement releases a
significant amount of heat within concrete elements. These raised temperatures
could give rise to thermal cracking which is a function of temperature differential
and concrete stiffness.
In recent years computer-based modelling has become an intrinsic part of
engineering. It has been employed to simulate the rise in temperature and
distribution of heat within concrete elements. The prediction model developed in
this project is based on the numerical finite element theory in combination with
heat evolution curves obtained from adiabatic calorimetry. Predicted results are
compared with two sets of measured data and comparisons are drawn. This model
is also evaluated against the pre-existing finite difference numerical simulation
(Ballim, 2004a). The finite element simulation provides engineers with
temperature differentials from which generalised rules for cracking potential may
be applied.
The implemented finite element model provides superior predictions to those of
existing simulations and allows for future developments due to the advanced
capabilities of the finite element theory.
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Stewart-Knox, Barbara, S. Kuznesof, J. Robinson, A. Rankin, K. Orr, M. Duffy, R. Poinhos i in. "Factors influencing European consumer uptake of personalised nutrition. Results of a qualitative analysis". 2013. http://hdl.handle.net/10454/6205.
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The aim of this research was to explore consumer perceptions of personalised nutrition and to compare these across three different levels of "medicalization": lifestyle assessment (no blood sampling); phenotypic assessment (blood sampling); genomic assessment (blood and buccal sampling). The protocol was developed from two pilot focus groups conducted in the UK. Two focus groups (one comprising only "older" individuals between 30 and 60 years old, the other of adults 18-65 yrs of age) were run in the UK, Spain, the Netherlands, Poland, Portugal, Ireland, Greece and Germany (N=16). The analysis (guided using grounded theory) suggested that personalised nutrition was perceived in terms of benefit to health and fitness and that convenience was an important driver of uptake. Negative attitudes were associated with internet delivery but not with personalised nutrition per se. Barriers to uptake were linked to broader technological issues associated with data protection, trust in regulator and service providers. Services that required a fee were expected to be of better quality and more secure. An efficacious, transparent and trustworthy regulatory framework for personalised nutrition is required to alleviate consumer concern. In addition, developing trust in service providers is important if such services to be successful.
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McIntosh, Bryan, G. Cookson i S. Jones. "Cancelled surgeries and payment by results in the English National Health Service". 2012. http://hdl.handle.net/10454/6502.
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OBJECTIVES: To model the frequency of 'last minute' cancellations of planned elective procedures in the English NHS with respect to the patient and provider factors that led to these cancellations. METHODS: A dataset of 5,288,604 elective patients spell in the English NHS from January 1st, 2007 to December 31st, 2007 was extracted from the Hospital Episode Statistics. A binary dependent variable indicating whether or not a patient had a Health Resource Group coded as S22--'Planned elective procedure not carried out'--was modeled using a probit regression estimated via maximum likelihood including patient, case and hospital level covariates. RESULTS: Longer waiting times and being admitted on a Monday were associated with a greater rate of cancelled procedures. Male patients, patients from lower socio-economic groups and older patients had higher rates of cancelled procedures. There was significant variation in cancellation rates between hospitals; Foundation Trusts and private facilities had the lowest cancellation rates. CONCLUSIONS: Further research is needed on why Foundation Trusts exhibit lower cancellation rates. Hospitals with relatively high cancellation rates should be encouraged to tackle this problem. Further evidence is needed on whether hospitals are more likely to cancel operations where the procedure tariff is lower than the S22 tariff as this creates a perverse incentive to cancel. Understanding the underlying causes of why male, older and patients from lower socio-economic groups are more likely to have their operations cancelled is important to inform the appropriate policy response. This research suggests that interventions designed to reduce cancellation rates should be targeted to high-cancellation groups.
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Khanová, Alžběta. "Žákovské strategie při řešení aditivních algoritmů". Master's thesis, 2014. http://www.nusl.cz/ntk/nusl-340494.
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This thesis deals with the strategies that pupils use for solving additive tasks. The theoretical part focuses on younger-school ages, the transformation of education in the 20th century and the addition operation. The practical part describes a series of experiments realized in mathematics lessons with pupils from the 1st elementary school. During the experiment, pupils have met the environment of the hundred board. I compared pupils's numerical strategies for solving additive algorithms, after the end of the experiment. Also I compared results between pupils, who were part of the experiment and are taught by textbooks from "Nakladatelství Fraus" with pupils who did not participate in the experiment and are taught by textbooks from "Nakladatelství ALTER".
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"Ecology of the lanternfishes (pisces: myctophidae) of the Eastern Gulf of Mexico [electronic resource] : with emphasis on age, growth and reproductive patterns of the numerically dominant species [electronic resource] / by John Vianney Gartner". 1990. http://purl.fcla.edu/fcla/dl/SF00000263.jpg.
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