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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Changes in the Freshwater System : Distinguishing Climate and Landscape Drivers

Jaramillo, Fernando January 2015 (has links)
Freshwater is a vital resource that circulates between the atmosphere, the land and the sea. Understanding and quantifying changes to the partitioning of precipitation into evapotranspiration, runoff and water storage change in the landscape are required for assessing changes to freshwater availability. However, the partitioning processes and their changes are complex due to multiple change drivers and effects. This thesis investigates and aims to identify and separate the effects of atmospheric climate change and various landscape drivers on long-term freshwater change. This is done based on hydroclimatic, land-use and water-use data from the beginning of the twentieth century up to present times and across different regions and scales, from catchment to global. The analyzed landscape drivers include historic developments of irrigated and non-irrigated agriculture and flow regulation. The thesis uses and develops further a data-motivated approach to interpret available hydroclimatic and landscape data for identification of water change drivers and effects, expanding the approach application from local to continental and global scales. Based on this approach development, the thesis identifies hydroclimatic change signals of landscape drivers against the background of multiple coexisting drivers influencing worldwide freshwater change, within and among hydrological basins. Globally, landscape drivers are needed to explain more than 70% of the historic hydroclimatic changes, of which a considerable proportion may be directly human-driven. These landscape- and human-driven water changes need to be considered and accounted for also in modeling and projection of changes to the freshwater system on land. / <p>At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 4: Submitted.</p> / VR, project 2009-3221
2

Fidelity of Implementation of Research Experience for Teachers in the Classroom

January 2012 (has links)
abstract: In this study, the Arizona State University Mathematics and Science Teaching Fellows 2010 program was analyzed qualitatively from start to finish to determine the impact of the research experience on teachers in the classroom. The sample for the study was the 2010 cohort of eight high school science teachers. Erickson's (1986) interpretive, participant observational fieldwork method was used to report data by means of detailed descriptions of the research experience and classroom implementation. Data was collected from teacher documents, interviews, and observations. The findings revealed various factors that were responsible for an ineffective implementation of the research experience in the classroom such as research experience, curriculum support, availability of resources, and school curriculum. Implications and recommendations for future programs are discussed in the study. / Dissertation/Thesis / Ph.D. Curriculum and Instruction 2012
3

Glada nyheter : En rapport om den röda gladans återkomst till Hornborgasjön och dess potentiella orsaker / Go fly a kite : a report on the return of the kites to the lake Hornborgasjön and its potential causes

Linstad, Johanne January 2020 (has links)
The purpose of this report has been to examine reason(s) behind the return of the red kite (Milvus milvus) to Hornborgasjön (a government-protected lake situated in the southwest of Sweden). The method of the study has been mainly based on observation-data reaching back to the latter part of the 19th century and ending with the year 2018, with the emphasis on the increasing numbers of nesting red kites during the 21st century. As a part of the study, email correspondence with ornithologists, mainly from Hornborgasjön field station, was also conducted, as well as comparison with other scientific research studies on the red kite. The results indicate that the red kite was a common bird of prey in the southern part of Sweden until the mid-19th century, after which the population started to decline. The main reasons seem to be both direct and indirect persecution. As a part of this the red kite, as well as many other birds of prey, were severely affected by different kinds of biocides used in the agriculture and in the forest industry. The return of the red kite seem to be a result of three factors, firstly it became protected in the 1920th, secondly a cease of the use of the most severely effecting biocides and thirdly a conservation project that started in Skåne in the mid-1970s. As the population of red kites increased in Skåne they started to extend their population northwards and thereby made their way back to Hornborgasjön. / <p>På grund av Covid-19 hölls presentationen via zoom</p>
4

Teachers' Feedback to Foster Scientific Discourse in Connected Science Classrooms

Lee, Soon Chun 16 August 2012 (has links)
No description available.

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