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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.
41

Pedogeomorphic terrain analysis for forestland resource management: Science and practice

Thwaites, R. Unknown Date (has links)
No description available.
42

Pedogeomorphic terrain analysis for forestland resource management: Science and practice

Thwaites, R. Unknown Date (has links)
No description available.
43

Electronic Resource Management Systems From ILS Vendors

Duranceau, Ellen 09 1900 (has links)
For several years libraries, especially larger libraries and research libraries, have been more and more desperately seeking systems and tools to help them manage electronic resources for several years. To date, most libraries seeking support for the full life cycle of electronic resource management (ERM) from selection through purchase, access, license management, and renewal or cancellation, have had to build their own systems, and many have done so. In addition to these homegrown systems, commercial sources have emerged to support ERM: there are those from third party serial and/or serial data vendors, such as EBSCO, SerialsSolutions, and TDNet; and those from major vendors of integrated library systems (ILS), such as Innovative Interfaces Inc. (III), which has an ERM system currently on the market, and other ILS vendors who are in varying stages of developing ERM functionality.[1] This article is an overview of the latter market.
44

The estimation of groundwater recharge by soil water balance in semi-arid regions

Eilers, V. H. M. January 2002 (has links)
Quantification of groundwater recharge is a crucial prerequisite for sustainable groundwater resource management, particularly in semi-arid areas where there are large demands for groundwater supplies. This research presents an alternative approach for recharge estimation based on the soil water balance technique. The purpose is to develop a model which provides a suitable balance between physical credibility and data which realistically can be gathered. A spreadsheet model was written based on the conceptual representation of the principal physical processes which actually affect recharge in a semi-arid area. Alternative procedures were included in order to represent: (a) the estimation of runoff, (b) the inclusion of the period with predominant bare soil evaporation and (c) the accounting for evapotranspiration following rainfall on dry soil. The model was tested using real data from a semi-arid region (Northeast Nigeria) making use of selected periods of days and years in order to illustrate the principal model characteristics. The results were presented in the form of diagrams and graphs helping to visualise the interactions between the physical components and the effect of the additional procedures on recharge estimation. The credibility of the model was investigated using an alternative concept of 'analysis of plausibility'. This concept makes use of as wide as possible a range of quantitative and qualitative information from the hydrological system in order to verify the robustness of the model when extensive datasets required by conventional validation techniques are not available. The results suggested that the modelled recharge is physically sound and it is in line with the overall determination of recharge in semi-arid areas by a range of methods. The soil water balance model was utilised to explore important aspects of recharge in semi-arid regions showing the effect of the field variability on the model's output. The preliminary results show that the developed concept reasonably represents the inherent field variability, thus corroborating the strength of the approach for recharge estimation in semi-arid regions.
45

Understanding the Efficacy of Fish Ladder Use by Alewife ( Alosa pseudoharengus)

Sullivan, Kevin M. 29 December 2017 (has links)
<p> River herring, the collective name given to North American populations of Alewife (<i>Alosa pseudoharengus</i>) and Blueback Herring (<i> A. aestivalis</i>), are iteroparous, anadromous members of the family Clupeidae, with similar morphology, ecological roles, and overlapping distributions. Once abundant in coastal rivers of New Hampshire, many factors including commercial fishing, habitat degradation, and dam construction resulted in a precipitous decline of the species along the entire coast. Successful efforts to restore populations have included the construction of fish ladders at dams. However, fish ladders require constant operation and maintenance to efficiently pass river herring, and only provide access to spawning habitat up to the next barrier, all too often, man-made.</p><p> Alewife passage efficiency in fish ladders of all designs has received little attention historically, but is important to understand how to interpret annual counts, that for many rivers are the only index used in current stock assessments. In this study, passive integrated transponder (PIT) tags were used to assess the passage efficiency of a Denil fish ladder on the Lamprey River in Newmarket, New Hampshire. The data collected allow for a better understanding of the movements and diel behavior of river herring in fishways, as well as insight into how the selectivity of fish ladders my shape the population demographics within a river system.</p><p> A breached dam located at Wadleigh Falls on the Lamprey River in Lee, New Hampshire was examined to determine if river herring were able to pass the existing structure or if it should be considered the upper extent of their annual spawning migration. Telemetry data indicated that Alewives were unable to pass the breached Wadleigh Falls Dam site and that it should be considered the uppermost extent of their migratory access. Results also show that migrating fish arriving at the location had a strong preference for the river-right channel when migrating upriver and exhibited very little exploratory behavior to seek alternate pathways upriver before emigrating back downriver, approximately two weeks after river entry. These in-river residence times were very similar to those found in other telemetry studies of anadromous Alewives. </p><p> Successful management and effective stock assessment for any species requires an understanding of its reproduction and recruitment. Fecundity is one measure of the reproductive potential of a species and was assessed in this study. Mature adult Alewives were collected at the head-of-tide dam on the Lamprey River in Newmarket, New Hampshire during the vernal spawning migration in 2012. A gonadosomatic index was used to determine that fish were sampled before spawning occurred, and egg diameters were quantified to examine distribution of eggs throughout the ovary. Fecundity was estimated gravimetrically using two techniques for comparison, and no difference between the methods was found. These findings show that image analysis is a fast and reliable method for fecundity estimation that does not require the use of a commonly used, toxic solution for ovary preservation. Fecundity estimates using image analysis ranged from 147,400 eggs at 24 cm to 332,500 eggs at 34 cm and aligns with previous findings of a clinal trend along the Atlantic Coast. Fecundity increased with total length, somatic weight, and age. Simple linear regressions exhibited good fits for fecundity-total length and fecundity-somatic weight, with age being the best predictor.</p><p>
46

L'Influence régionale des chantiers cooperatifs du Nord-Ouest québécois

Dorion, Jean-Claude January 1972 (has links)
Abstract not available.
47

Essai de définition du rôle de la forêt dans la fréquentation des sites de camping: Une méthode et une application

Poulin, Ghyslain January 1977 (has links)
Abstract not available.
48

Relationships Between Land Use and Mercury Contamination in Twelve Tributaries of the Lake St Francis Region of the St Lawrence River near Cornwall, Ontario

Harrison, Sarah January 2010 (has links)
In the environment, oxidized mercury (Hg) can be converted to more toxic chemical species, such as methylmercury (MeHg), as a result of both abiotic and biotic reactions. Hg and MeHg are present in aquatic ecosystems that flow into the Lake St. Francis region of the St. Lawrence River, but their origin is still being debated. A study of mercury and methylmercury contamination in Lake St. Francis in cooperation with the Raisin Region Conservation Authority (RRCA) is ongoing, in collaboration with the Ontario Ministry of Agriculture, Food, and Rural Affairs (OMAFRA) and the Great Lakes Program. A recent report detailed the experimental results for one portion of the area of concern, the Raisin River. The goal of the present project is to update and expand upon the previous work in order to include other existing and new data for this river and several other watercourses feeding Lake St. Francis. Special attention was paid to the MeHg hotspots in an attempt to link methylation and subsequent mobilization to different types of land use and nutrient profiles compiled from new and existing data. It was predicted that water draining off wetlands would have higher MeHg concentrations than water from catchments with other land use profiles. Total and methylmercury were expected to be correlated to the concentrations of nitrogen compounds, sulfate, phosphorus, dissolved inorganic carbon (DIC), and especially dissolved organic carbon (DOC). However, wetlands could not be correlated to MeHg as predicted but the area of crop land was correlated positively with the percentage of THg present as MeHg. Forest and impermeable areas were associated with a decrease in mercury. There was no difference in mercury during wet years compared to dry years when compared on an annual basis, but a significant seasonal difference exists between the two categories. MeHg was positively correlated to DOC, NH3, and BOD. THg was positively correlated to BOD, TSS, Escherichia coli, and fecal coliforms. The percentage of THg present as MeHg (%MeHg) was positively correlated to phosphorus. There were also some statistically significant negative correlations. Forest and impermeable area were negatively correlated with the quantity of MeHg, and impermeable area was negatively correlated with %MeHg. Greater predictor strength and more numerous significant correlations are expected under more thorough sampling and more data.
49

A Comparison of Three Wetland Evaluation Methods in their Assessment of Nontidal Wetlands in the Coastal Plain of Virginia

Chaun, Melissa Claire 01 January 1995 (has links)
No description available.
50

Cultural Perspectives on Communication in Community Leadership

Anwar, Abeer 01 January 2018 (has links)
Effective communication is important, particularly for the over 26 million immigrant workers with non-English speaking backgrounds who have entered the U.S. workforce. The research problem addressed the disillusion of non-English speakers in the workplace because of the communication gap. The purpose of this study was to explore and describe the experiences of non-English speaking immigrant workers in overcoming language and cultural communication challenges at work. The research question focused on how non-English speakers or English as a Second Language (ESL) speakers describe their communication experiences in the workplace. The theoretical framework was based on the cultural approach to organizations and the transactional model of communication. A qualitative narrative inquiry design was used that employed sources of information including an interview questionnaire and existing literature. The target population was immigrant employees who are managers, assistant managers, and supervisors in New York City and Long Island who work in accounting, banking, finance, information technology, and marketing with at least 5 years' experience. A purposive sampling procedure was used to select 20 participants for semistructured interviews. The qualitative data were subjectively analyzed by using member checking and triangulation. Key findings indicated 6 themes: miscommunication, lack of appropriate terms, delays in work completion, loss of respect, inability to express oneself clearly, and the need to use alternative means of communication. Opportunity for contributions to social change can include increased understanding and utilization of effective management and communication strategies for dealing with non-English-speaking and ESL workers. This can also help to bridge cultural and language gaps.

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