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Academic literature on the topic 'Numerical Ages'

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Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Numerical Ages"

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Geyh, Mebus A. "The handling of numerical ages and their random uncertainties." E&G Quaternary Science Journal 57, no. 1/2 (August 1, 2008): 239–52. http://dx.doi.org/10.3285/eg.57.1-2.10.

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Abstract. The correct handling of numerical ages and their standard deviations and a proper introduction to error propagation or propagation of uncertainty and statistical evaluation are important to avoid misleading chronological conclusions and statements even though based on properly determined and reliable numerical dates. The conclusions may also be erroneous if dates were taken from databases without sufficient background information on the origin of the dated material and the applied analytical techniques. This paper is an introduction into the field of mathematical handling and testing of numerical ages. The most common and simple calculations and statistical tests that are needed are described and the steps involved are demonstrated on examples. The problems involved in the visualization of numerical dates in the form of normal histograms and dispersion histograms are discussed.
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Osborn, Gerald, Daniel McCarthy, Aline LaBrie, and Randall Burke. "Lichenometric Dating: Science or Pseudo-Science?" Quaternary Research 83, no. 1 (January 2015): 1–12. http://dx.doi.org/10.1016/j.yqres.2014.09.006.

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AbstractThe popular technique of estimating ages of deposits from sizes of lichens continues despite valid criticism, and without agreement on range of utility, treatment of error, and methods of measurement, sampling, and data handling. A major source of error is the assumption that the largest lichen(s) colonized soon after deposition and will survive indefinitely. Recent studies on lichen mortality suggest that this assumption is untenable. Meanwhile, the use of “growth curves” constructed from independently dated substrates is problematic for many reasons, but this has not prevented the publication of baseless claims of accuracy and ages that are extrapolated well beyond data. Experiments indicate that numeric lichenometric ages are not reliable, and in general do not advance the cause of Quaternary science. There are a few studies suggesting reliability, and indeed there may be cases where lichens and growth curves actually provide realistic numerical ages. But it cannot be foretold which lichen assemblages will provide good ages and which bad ages. The logical conclusion is that no assumption of good ages can be made, and that it is folly to assign numerical ages to a deposit on the basis of lichen sizes.
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Siegler, Robert S., and John E. Opfer. "The Development of Numerical Estimation." Psychological Science 14, no. 3 (May 2003): 237–50. http://dx.doi.org/10.1111/1467-9280.02438.

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We examined children's and adults' numerical estimation and the representations that gave rise to their estimates. The results were inconsistent with two prominent models of numerical representation: the logarithmic-ruler model, which proposes that people of all ages possess a single, logarithmically spaced representation of numbers, and the accumulator model, which proposes that people of all ages represent numbers as linearly increasing magnitudes with scalar variability. Instead, the data indicated that individual children possess multiple numerical representations; that with increasing age and numerical experience, they rely on appropriate representations increasingly often; and that the numerical context influences their choice of representation. The results, obtained with second graders, fourth graders, sixth graders, and adults who performed two estimation tasks in two numerical contexts, strongly suggest that one cause of children's difficulties with estimation is reliance on logarithmic representations of numerical magnitudes in situations in which accurate estimation requires reliance on linear representations.
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Liu, Longlong, Zhaosheng Zhang, Zehua Huangfu, and Dahai Huang. "Numerical analysis of concrete temperature stress at different loading ages." Journal of Physics: Conference Series 1732 (January 2021): 012107. http://dx.doi.org/10.1088/1742-6596/1732/1/012107.

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Legendre, Serge, and Bernadette Bachelet. "The numerical ages: A new method of datation applied to Paleogene mammalian localities from Southern France." Newsletters on Stratigraphy 29, no. 3 (November 19, 1993): 137–58. http://dx.doi.org/10.1127/nos/29/1993/137.

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Ali. "NUMERICAL PREDICTION MODEL FOR TEMPERATURE DISTRIBUTIONS IN CONCRETE AT EARLY AGES." American Journal of Engineering and Applied Sciences 5, no. 4 (April 1, 2012): 282–90. http://dx.doi.org/10.3844/ajeassp.2012.282.290.

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Ali. "NUMERICAL PREDICTION MODEL FOR TEMPERATURE DISTRIBUTIONS IN CONCRETE AT EARLY AGES." American Journal of Engineering and Applied Sciences 7, no. 2 (February 1, 2014): 255–65. http://dx.doi.org/10.3844/ajeassp.2014.255.265.

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Odin, G. S. "Concerning the numerical ages proposed for the Jurassic and Cretaceous geochronology." Geological Society, London, Memoirs 10, no. 1 (1985): 196–98. http://dx.doi.org/10.1144/gsl.mem.1985.010.01.16.

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van Breugel, K. "Numerical modelling of volume changes at early ages - Potential, pitfalls and challenges." Materials and Structures 34, no. 239 (April 27, 2001): 293–301. http://dx.doi.org/10.1617/13759.

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Jin, Nanguo, Ye Tian, and Xianyu Jin. "Numerical simulation of fracture and damage behaviour of concrete at different ages." Computers and Concrete 4, no. 3 (June 25, 2007): 221–41. http://dx.doi.org/10.12989/cac.2007.4.3.221.

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Dissertations / Theses on the topic "Numerical Ages"

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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 &amp 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, and 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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Books on the topic "Numerical Ages"

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Zählen: Semantische und praxeologische Studien zum numerischen Wissen im Mittelalter. Göttingen: Vandenhoeck & Ruprecht, 2011.

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Kasper, Judith D. Aging alone: Profiles and projections. [Baltimore, Md.]: Commonwealth Fund Commission on Elderly People Living Alone, 1988.

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Taeuber, Cynthia Murray. Sixty-five plus in America. Washington, DC: U.S. Dept. of Commerce, Economics and Statistics Administration, Bureau of the Census, 1993.

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Taeuber, Cynthia Murray. Sixty-five plus in America. Washington, DC: U.S. Dept. of Commerce, Economics and Statistics Administration, Bureau of the Census, 1993.

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United States. Bureau of the Census., ed. Sixty-five plus in America. Washington, DC: U.S. Dept. of Commerce, Economics and Statistics Administration, Bureau of the Census, 1992.

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Taeuber, Cynthia Murray. Sixty-five plus in America. Washington, DC: U.S. Dept. of Commerce, Economics and Statistics Administration, Bureau of the Census, 1993.

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Taeuber, Cynthia Murray. Sixty-five plus in America. Washington, DC: U.S. Dept. of Commerce, Economics and Statistics Administration, Bureau of the Census, 1992.

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Taeuber, Cynthia Murray. Sixty-five plus in America. Washington, DC: U.S. Dept. of Commerce, Economics and Statistics Administration, Bureau of the Census, 1993.

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United States. Bureau of the Census., ed. Sixty-five plus in America. Washington, DC: U.S. Dept. of Commerce, Economics and Statistics Administration, Bureau of the Census, 1993.

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Taeuber, Cynthia Murray. Sixty-five plus in America. Washington, DC: U.S. Dept. of Commerce, Economics and Statistics Administration, Bureau of the Census, 1993.

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Book chapters on the topic "Numerical Ages"

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Geyh, Mebus A. "Numerical Modeling with Groundwater Ages." In Radiocarbon After Four Decades, 276–87. New York, NY: Springer New York, 1992. http://dx.doi.org/10.1007/978-1-4757-4249-7_19.

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Zhang, Hongmei, and Xilin Lu. "Numerical Simulation Research of the Laminated RC Shear Walls with Different Concrete Ages." In Communications in Computer and Information Science, 40–47. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-19853-3_6.

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Dimitriu, Gabriel. "Parameter Estimation in Size/Age Structured Population Models Using the Moving Finite Element Method." In Numerical Methods and Applications, 420–29. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/3-540-36487-0_47.

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Iannelli, Mimmo, and Fabio Milner. "Numerical Methods for the Linear Model." In The Basic Approach to Age-Structured Population Dynamics, 89–122. Dordrecht: Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1146-1_3.

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Iannelli, Mimmo, and Fabio Milner. "Numerical Methods for the Nonlinear Model." In The Basic Approach to Age-Structured Population Dynamics, 201–17. Dordrecht: Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1146-1_7.

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Fan, Grace, Wenfei Fan, and Floris Geerts. "Detecting Errors in Numeric Attributes." In Web-Age Information Management, 125–37. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-08010-9_15.

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Caruso, Giulia, Adelia Evangelista, and Stefano Antonio Gattone. "Profiling visitors of a national park in Italy through unsupervised classification of mixed data." In Proceedings e report, 135–40. Florence: Firenze University Press, 2021. http://dx.doi.org/10.36253/978-88-5518-304-8.27.

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Cluster analysis has for long been an effective tool for analysing data. Thus, several disciplines, such as marketing, psychology and computer sciences, just to mention a few, did take advantage from its contribution over time. Traditionally, this kind of algorithm concentrates only on numerical or categorical data at a time. In this work, instead, we analyse a dataset composed of mixed data, namely both numerical than categorical ones. More precisely, we focus on profiling visitors of the National Park of Majella in the Abruzzo region of Italy, which observations are characterized by variables such as gender, age, profession, expectations and satisfaction rate on park services. Applying a standard clustering procedure would be wholly inappropriate in this case. Therefore, we hereby propose an unsupervised classification of mixed data, a specific procedure capable of processing both numerical than categorical variables simultaneously, releasing truly precious information. In conclusion, our application therefore emphasizes how cluster analysis for mixed data can lead to discover particularly informative patterns, allowing to lay the groundwork for an accurate customers profiling, starting point for a detailed marketing analysis.
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Duan, Lei, Jie Zuo, Tianqing Zhang, Jing Peng, and Jie Gong. "Mining Contrast Inequalities in Numeric Dataset." In Web-Age Information Management, 194–205. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-14246-8_21.

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Kulikov, Igor, Igor Chernykh, Dmitry Karavaev, Victor Protasov, Vladislav Nenashev, and Vladimir Prigarin. "The Numerical Simulation of Radial Age Gradients in Spiral Galaxies." In Communications in Computer and Information Science, 365–74. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-64616-5_32.

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He, Jian. "Numerical Analysis for Stochastic Age-Dependent Population Equations with Diffusion." In Advances in Intelligent and Soft Computing, 37–43. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-28658-2_6.

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Conference papers on the topic "Numerical Ages"

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Scott, Robert W. "METHODOLOGY TO CALIBRATE NUMERICAL AGES FOR CARBON ISOTOPE EVENTS: BARREMIAN-ALBIAN." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-303218.

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Segura, Jose M., Miguel A. Caja, Laura García, Juan M. Jiménez, Jorge Díez, Teresa Polo, Jose Alvarellos Iglesias, and M. R. Lakshmikantha. "An Integrated Numerical and Mineralogical Study of a High Pressure High Temperature Well." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-78152.

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Predicting drilling risks in advance is a major challenge in areas that lack drilling experience, and even when information from offset wells is available. Large overpressure was found at TD of an offshore exploratory well drilled mainly through shale. None of the other two previously drilled offset wells in the area had shown any sign of such a high overpressure. This study presents two complementary approaches to gain insight on the overpressure generation mechanisms. The effect of chemical compaction is first evaluated in terms of well cuttings analysis, including sample washing, high-resolution photo catalog, automated mineralogy and X-ray diffraction clay mineralogy analysis. The obtained mineralogical results confirm the presence of the dehydration diagenetic process involving the transformation of smectite to illite. Consequently, a numerical model is presented which combines the effect of mechanical and chemical compaction to predict pore pressure values very close to the overpressure observed during drilling. The model reproduces the depositional history of the lithological column by coupling mechanical and chemical compaction with fluid flow over geological time, and it allows predicting stress, porosity and pore pressure evolution at different geological ages. Calibration and verification of the results of the pore pressure model is done by comparison to drilling experience and logs (post-drill pore pressure profile, geology tops and density/porosity logs).
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Santos de Oliveira, Iona´ Maghali, Paulo Fernando Ferreira Frutuoso e Melo, and Marcos Oliveira de Pinho. "An Aging Simulation Model for the Emergency Diesel Generators of Angra 2 by Supplementary Variables." In 16th International Conference on Nuclear Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/icone16-48112.

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The extension of the useful lifetime of nuclear power plants is an issue of great importance and concern. From the reliability point of view, this problem requires the consideration of time-dependent failure rates and possible failure dependencies. This analysis has been typically performed through a Markovian approach. To illustrate this point, we have developed a computerized reliability analysis of the emergency diesel generators (EDGs) of a four “loop” PWR plant, considering the hypothesis of aging and perfect repair by using Supplementary Variables to cast the initially Nonmarkovian model into a Markovian one. In order to perform such analysis and to simulate aging effects, a nuclear plant has been taken for reference, which has been commercially operating for only six years. Failure rates were obtained from similar EDGs of another plant, already under aging, while repair data were taken from its technical specifications. Discontinuous repair rates were considered in order to improve maintenance strategies. Several ages were attributed to these equipments, allowing the calculus of the failure probability as well as their availability according to each regarded age. In this sense, the EDGs behavior as to aging can be obtained in detail and decisions concerning maintenance and useful lifetime extension can be made on a stronger basis. To get the desired results in terms of reliability figures and due to the discontinuous repair rates that had to be taken into account, a new numerical method that uses a part of the analytical solution, called Euler Iterative + Characteristic, has been developed in order to solve the differential equations systems, making the solving of the system faster and more efficient.
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Billy, Frédérique, Jean Clairambault, Olivier Fercoq, Stéphane Gaubert, Thomas Lepoutre, Thomas Ouillon, Theodore E. Simos, George Psihoyios, Ch Tsitouras, and Zacharias Anastassi. "Proliferation in Cell Population Models with Age Structure." In NUMERICAL ANALYSIS AND APPLIED MATHEMATICS ICNAAM 2011: International Conference on Numerical Analysis and Applied Mathematics. AIP, 2011. http://dx.doi.org/10.1063/1.3637834.

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Tu, Tse-Yi, Paul C. P. Chao, Yung-Pin Lee, and Yung-Hua Kao. "Optimal Design and Experimental Validation of a New No-Cuff Blood Pressure Sensor Based on a New Finite Element Model." In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-35552.

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A new multi-physics finite element model (FEM) on the vibration of the radial artery on the wrist is built by this study to predict vibration of wrist artery vessel vibration and then diastolic and systolic blood pressures. The FEM includes the sensor of gel capsule and strain-sensing electrodes, skin, bones and muscles. The vibrations of skin surface and the sensor module are successfully simulated by the established FEM. The resulted vibratory deformation of the sensor electrodes are further transformed to resistance variations to mimic realistic electronics of the front-end readout circuit via establishing a cross-discipline sub-FEM model. The established FEM can is particularly customized to varied ages, weights, heights, genders, and special cardiovascular diseases of users. The customization can be performed in a fashion of one-time calibration by medical staff and/or medical staff. With the customized FEM in high accuracy level, the diastolic and systolic pressures can be accurately predicted by the simulated output resistance variation. Based on simulation FEMs, the design of the pulse sensor is successfully optimized via the processes of Taguchi and numerical methods. The measurements are also conducted to a dozen of subjects. It shows that the designed novel blood pressure sensor is capable of sensing the blood pressure to require accuracy level of the error less than 10% as compared to commercial counterparts with a cumbersome cuff.
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El-Doma, Mohamed O., Theodore E. Simos, George Psihoyios, and Ch Tsitouras. "Age-structured & Size-structured Population Dynamics Models." In NUMERICAL ANALYSIS AND APPLIED MATHEMATICS: International Conference on Numerical Analysis and Applied Mathematics 2009: Volume 1 and Volume 2. AIP, 2009. http://dx.doi.org/10.1063/1.3241393.

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Feng, Qinghua, Theodore E. Simos, George Psihoyios, and Ch Tsitouras. "Parallel AGE Method for Solving Convection-Diffusion Equation." In NUMERICAL ANALYSIS AND APPLIED MATHEMATICS: International Conference on Numerical Analysis and Applied Mathematics 2009: Volume 1 and Volume 2. AIP, 2009. http://dx.doi.org/10.1063/1.3241423.

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Vala, J., S. Št’astník, V. Kozák, Theodore E. Simos, George Psihoyios, and Ch Tsitouras. "Computational Thermomechanical Modelling of Early-Age Silicate Composites." In NUMERICAL ANALYSIS AND APPLIED MATHEMATICS: International Conference on Numerical Analysis and Applied Mathematics 2009: Volume 1 and Volume 2. AIP, 2009. http://dx.doi.org/10.1063/1.3241435.

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Jelen, Jaroslaw, Hossein Golshan, and Sandy Rizopoulos. "Determination of Pipe Roughness and Heat Transfer Coefficient in Pipeline Networks Using Multidomain Solution Method." In 1998 2nd International Pipeline Conference. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/ipc1998-2094.

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In the development of new pipeline projects, all too often assumptions that are made in the initial stages of the business development opportunity are, for the most part, overly conservative. This inaccuracy is carried out through to the operation of the pipeline system and most assumptions do not change with subsequent expansions in the future until a conscious effort is made to determine and monitor those significant parameters that impact the pipeline’s overall performance. In highly complex systems such as NOVA Gas Transmission Ltd.’s (NGTL’s) pipeline network, with over 21400 Km of pipe segments of different sizes and ages, for an accurate determination of pressure drop while 12 BCF of gas, on average, is flowing through our network, we need a technique to precisely assess the values of friction factor and heat transfer coefficient. These values have a profound impact on the accuracy of the hydraulic simulations. The calculated values of pressure, flow rate, and temperature may be distorted by imprecise values of some parameters, such as friction factor or heat transfer coefficient. Thus, a proper estimation of these parameters is of great importance to the successful numerical flow simulation. Both friction factor and heat transfer coefficient are very difficult to measure; therefore, their values can only be assessed by solving an inverse problem (i.e. parameter identification process). Since the parameter estimation procedure reported in this paper requires multiple solution of inviscid gasdynamics differential equations, describing the gas flow through the pipeline system, a multidomain solution method has been applied to effectively solve the parameter identification problem.
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Boggs, Steven A. "Research in the age of numerical simulation." In 2017 IEEE Conference on Electrical Insulation and Dielectric Phenomenon (CEIDP). IEEE, 2017. http://dx.doi.org/10.1109/ceidp.2017.8257646.

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Reports on the topic "Numerical Ages"

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Davis, W. J., and D. W. Davis. Alpha recoil loss of Pb from baddeleyite evaluated by High Resolution Ion Microprobe (SHRIMP II) depth profiling and numerical modelling: implications for the interpretation of U-Pb ages in small baddeleyite crystals - supplemental data files. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2020. http://dx.doi.org/10.4095/327563.

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Karlstrom, Karl, Laura Crossey, Allyson Matthis, and Carl Bowman. Telling time at Grand Canyon National Park: 2020 update. National Park Service, April 2021. http://dx.doi.org/10.36967/nrr-2285173.

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Grand Canyon National Park is all about time and timescales. Time is the currency of our daily life, of history, and of biological evolution. Grand Canyon’s beauty has inspired explorers, artists, and poets. Behind it all, Grand Canyon’s geology and sense of timelessness are among its most prominent and important resources. Grand Canyon has an exceptionally complete and well-exposed rock record of Earth’s history. It is an ideal place to gain a sense of geologic (or deep) time. A visit to the South or North rims, a hike into the canyon of any length, or a trip through the 277-mile (446-km) length of Grand Canyon are awe-inspiring experiences for many reasons, and they often motivate us to look deeper to understand how our human timescales of hundreds and thousands of years overlap with Earth’s many timescales reaching back millions and billions of years. This report summarizes how geologists tell time at Grand Canyon, and the resultant “best” numeric ages for the canyon’s strata based on recent scientific research. By best, we mean the most accurate and precise ages available, given the dating techniques used, geologic constraints, the availability of datable material, and the fossil record of Grand Canyon rock units. This paper updates a previously-published compilation of best numeric ages (Mathis and Bowman 2005a; 2005b; 2007) to incorporate recent revisions in the canyon’s stratigraphic nomenclature and additional numeric age determinations published in the scientific literature. From bottom to top, Grand Canyon’s rocks can be ordered into three “sets” (or primary packages), each with an overarching story. The Vishnu Basement Rocks were once tens of miles deep as North America’s crust formed via collisions of volcanic island chains with the pre-existing continent between 1,840 and 1,375 million years ago. The Grand Canyon Supergroup contains evidence for early single-celled life and represents basins that record the assembly and breakup of an early supercontinent between 729 and 1,255 million years ago. The Layered Paleozoic Rocks encode stories, layer by layer, of dramatic geologic changes and the evolution of animal life during the Paleozoic Era (period of ancient life) between 270 and 530 million years ago. In addition to characterizing the ages and geology of the three sets of rocks, we provide numeric ages for all the groups and formations within each set. Nine tables list the best ages along with information on each unit’s tectonic or depositional environment, and specific information explaining why revisions were made to previously published numeric ages. Photographs, line drawings, and diagrams of the different rock formations are included, as well as an extensive glossary of geologic terms to help define important scientific concepts. The three sets of rocks are separated by rock contacts called unconformities formed during long periods of erosion. This report unravels the Great Unconformity, named by John Wesley Powell 150 years ago, and shows that it is made up of several distinct erosion surfaces. The Great Nonconformity is between the Vishnu Basement Rocks and the Grand Canyon Supergroup. The Great Angular Unconformity is between the Grand Canyon Supergroup and the Layered Paleozoic Rocks. Powell’s term, the Great Unconformity, is used for contacts where the Vishnu Basement Rocks are directly overlain by the Layered Paleozoic Rocks. The time missing at these and other unconformities within the sets is also summarized in this paper—a topic that can be as interesting as the time recorded. Our goal is to provide a single up-to-date reference that summarizes the main facets of when the rocks exposed in the canyon’s walls were formed and their geologic history. This authoritative and readable summary of the age of Grand Canyon rocks will hopefully be helpful to National Park Service staff including resource managers and park interpreters at many levels of geologic understandings...
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Ehrlich, Isaac, and Yong Yin. Explaining Diversities in Age-Specific Life Expectancies and Values of Life Saving: A Numerical Analysis. Cambridge, MA: National Bureau of Economic Research, September 2004. http://dx.doi.org/10.3386/w10759.

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Bruce, Judith, and Shelley Clark. The implications of early marriage for HIV/AIDS policy. Population Council, 2004. http://dx.doi.org/10.31899/pgy22.1000.

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This brief is based on a background paper prepared for the WHO/UNFPA/Population Council Technical Consultation on Married Adolescents, held in Geneva, Switzerland, December 9–12, 2003. The final paper is entitled “Including married adolescents in adolescent reproductive health and HIV/AIDS policy.” The consultation brought together experts from the United Nations, donors, and nongovernmental agencies to consider the evidence regarding married adolescent girls’ reproductive health, vulnerability to HIV infection, social and economic disadvantage, and rights. The relationships to major policy initiatives—including safe motherhood, HIV, adolescent sexual and reproductive health, and reproductive rights—were explored, and emerging findings from the still relatively rare programs that are directed at this population were discussed. Married adolescent girls are outside the conventionally defined research interests, policy diagnosis, and basic interventions that have underpinned adolescent reproductive health programming and many HIV/AIDS prevention activities. They are an isolated, often numerically large, and extremely vulnerable segment of the population, largely untouched by current intervention strategies. As stated in this brief, promoting later marriage, to at least age 18, and shoring up protection options within marriage may be essential means of stemming the epidemic.
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Lumpkin, Shamsie, Isaac Parrish, Austin Terrell, and Dwayne Accardo. Pain Control: Opioid vs. Nonopioid Analgesia During the Immediate Postoperative Period. University of Tennessee Health Science Center, July 2021. http://dx.doi.org/10.21007/con.dnp.2021.0008.

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Background Opioid analgesia has become the mainstay for acute pain management in the postoperative setting. However, the use of opioid medications comes with significant risks and side effects. Due to increasing numbers of prescriptions to those with chronic pain, opioid medications have become more expensive while becoming less effective due to the buildup of patient tolerance. The idea of opioid-free analgesic techniques has rarely been breached in many hospitals. Emerging research has shown that opioid-sparing approaches have resulted in lower reported pain scores across the board, as well as significant cost reductions to hospitals and insurance agencies. In addition to providing adequate pain relief, the predicted cost burden of an opioid-free or opioid-sparing approach is significantly less than traditional methods. Methods The following groups were considered in our inclusion criteria: those who speak the English language, all races and ethnicities, male or female, home medications, those who are at least 18 years of age and able to provide written informed consent, those undergoing inpatient or same-day surgical procedures. In addition, our scoping review includes the following exclusion criteria: those who are non-English speaking, those who are less than 18 years of age, those who are not undergoing surgical procedures while admitted, those who are unable to provide numeric pain score due to clinical status, those who are unable to provide written informed consent, and those who decline participation in the study. Data was extracted by one reviewer and verified by the remaining two group members. Extraction was divided as equally as possible among the 11 listed references. Discrepancies in data extraction were discussed between the article reviewer, project editor, and group leader. Results We identified nine primary sources addressing the use of ketamine as an alternative to opioid analgesia and post-operative pain control. Our findings indicate a positive correlation between perioperative ketamine administration and postoperative pain control. While this information provides insight on opioid-free analgesia, it also revealed the limited amount of research conducted in this area of practice. The strategies for several of the clinical trials limited ketamine administration to a small niche of patients. The included studies provided evidence for lower pain scores, reductions in opioid consumption, and better patient outcomes. Implications for Nursing Practice Based on the results of the studies’ randomized controlled trials and meta-analyses, the effects of ketamine are shown as an adequate analgesic alternative to opioids postoperatively. The cited resources showed that ketamine can be used as a sole agent, or combined effectively with reduced doses of opioids for multimodal therapy. There were noted limitations in some of the research articles. Not all of the cited studies were able to include definitive evidence of proper blinding techniques or randomization methods. Small sample sizes and the inclusion of specific patient populations identified within several of the studies can skew data in one direction or another; therefore, significant clinical results cannot be generalized to patient populations across the board.
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