Sökning: "spatial dependence"

Visar resultat 6 - 10 av 137 avhandlingar innehållade orden spatial dependence.

  1. 6. Local Polynomial Regression with Application on Lidar Measurements

    Författare :Torgny Lindström; Matematisk statistik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Mathematics; Matematik; differential equations; Funktioner; differentialekvationer; variance-function estimation.; spatial dependence; nonparametric; local polynomial regression; local bandwidth selection; lidar; heteroscedasticity; Bivariate estimation; differential absorption; Functions;

    Sammanfattning : This thesis deals with the problem of estimating a function or one of its derivatives from a set of measurements, mainly of a bivariate or spatial nature which is so common in environmental applications. In this work particular attention has been on the lidar (light detection and ranging) application which is a versatile technique for measurement of among other things atmospheric trace gases. LÄS MER

  3. 7. Hydrogeochemistry and spatial variability of arsenic and other trace elements in the Lower Katari Basin around Lake Titicaca, Bolivian Altiplano. : Impact on drinking water quality and groundwater management

    Författare :Israel Quino Lima; Prosun Bhattacharya; Jerker Jarsjö; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Arsenic; trace elements; multivariate analysis; spatial variability; hydrogeology; spatio-temporal variability; Lower Katari Basin; Bolivian Altiplano; alluvial sediments; Arsenik; spårelement; multivariat analys; rumslig variabilitet; hydrogeologi; spatio-temporär variation; Nedre Katari-bassängen; Bolivian Altiplano; alluviala sediment; Land and Water Resources Engineering; Mark- och vattenteknik;

    Sammanfattning : Arsenic (As) contamination in drinking water is a world-wide problem. Thenatural origin of As, its mobility and transport are of great interest in BolivianAltiplano (Lower Katari Basin: LKB and Sothern Poopó Basin: SPB) due topresence of mineral ore deposits, brines, hot springs and volcanic rocks. LÄS MER

  4. 8. The Impact of Nandrolone Decanoate on Neuropeptidergic Mechanisms Related to Cognition, Aggression, Reward and Dependence

    Författare :Kristina Magnusson; Fred Nyberg; Mathias Hallberg; Santi Mario Spampinato; Uppsala universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Anabolic androgenic steroids; Nandrolone decanoate; Substance P; Dynorphin A; KOP receptor; Prodynorphin; Radioimmunoassay; Autoradiography; Morris water maze; PCR; Central nervous system; Biological research on drug dependence; Biologisk beroendeforskning; Biological Research on Drug Dependence; Biologisk beroendeforskning;

    Sammanfattning : The abuse of anabolic androgenic steroids (AAS) is becoming increasingly common and may result in a range of physiological as well as psychological effects such as altered behavior in terms of increased aggression, cognitive dysfunction and addictive behavior. AAS comprise testosterone and its derivatives, of which nandrolone is one of the more common. LÄS MER

  5. 9. Spatial control of mRNA stability in yeast

    Författare :Susanne Huch; Tracy Nissan; Anders Byström; Anders Virtanen; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; mRNA stability; P bodies; mRNA turnover; gene regulation; decapping factors; molekylärbiologi; Molecular Biology;

    Sammanfattning : The degradation of mRNA is an important modulator of gene expression and the ultimate fate of messenger mRNA. Important steps in the degradation of mRNA include initial shortening of its poly(A) tail followed by the subsequent removal of the m7G cap. These two processes are linked temporally as well as spatially. LÄS MER

  7. 10. Noise Convolution Models: Fluids in Stochastic Motion, Non-Gaussian Tempo-Spatial Fields, and a Notion of Tilting

    Författare :Jörg Wegener; Matematisk statistik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; generalized Laplace; shallow water equations; asymmetry; noise convolution models; tempo-spatial fields; non-Gaussian model;

    Sammanfattning : The primary topic of this thesis is a class of tempo-spatial models which are rather flexible in a distributional sense. They prove quite successful in modeling (temporal) dependence structures and go beyond the limitation of Gaussian models, thus allowing for heavy tails and skewness. LÄS MER