• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 5164
  • 2761
  • 1582
  • 218
  • 125
  • 123
  • 118
  • 86
  • 34
  • 31
  • 17
  • 16
  • 12
  • 12
  • 10
  • Tagged with
  • 11469
  • 2599
  • 2185
  • 2124
  • 1918
  • 1800
  • 1627
  • 1625
  • 1273
  • 1265
  • 1210
  • 1181
  • 1087
  • 816
  • 748
  • 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.
451

Conceptualizing Urban Green Space within Municipal Sustainability Plans| Parks, Tree Canopy, and Urban Gardens

Rowland, Jennifer 18 July 2014 (has links)
<p> As the concept of sustainability gains prominence in the U.S., municipal governments have begun adopting official sustainability plans to outline their goals for a sustainable future. However, with an absence of national guidelines or a streamlined definition of sustainability, these plans contain infinitely diverse goals, policies and motivations. One aspect of sustainability which has a diverse array of benefits and challenges is urban green space. This research uses content analysis and coding of municipal sustainability plans to gain insight into how U.S. cities conceptualize urban green space in the forms of parks, tree canopy and urban gardens and in the greater context of sustainability. This thesis specifically looks at the creation of municipal sustainability plans, how cities organize green space, how cities value green spaces, the kinds of green space goals and benchmarks that cities set, and the inclusion of equity in the realm of green spaces. The 20 case study cities have shown green spaces are an important component of sustainability planning and are conceptualized and included in varying and unique ways. The way a plan is created, the people involved or excluded from the plan creation process and the agreements or groups that cities join can impact how cities envision sustainability and how they conceptualize green space within the plan. The concepts of sustainability and green space appear to be best articulated and operationalized in the context of many voices, viewpoints and opinions. In the categorization of green space, this research found that only a few cities had headings specific to green space, but instead associated it primarily with other aspects of the natural environment. This research also found that the language used to describe green space is broad and varied. Standardization or concrete definitions of these terms may make plans more accessible. Cities discussed environmental, economic and social benefits of green spaces in their plans. Overall, cities valued environmental benefits the most and the majority of benefits identified in the plans are anthropocentric in nature. Some of the best practice green space goals identified within the plans were the inclusion of green corridors, native vegetation, increasing the tree canopy, changing zoning codes to include urban agriculture and goals related to equity and access. Overall, both the goal setting and measurement processes of urban green space serve as beneficial ways for cities to achieve their broader sustainability goals. However, these goals cannot be fully realized when their distribution and access are unequal across the city and when decisions are made without the input of local residents. This research found that there is a gulf between equity being mentioned in a plan, and the depth to which it is explored in the context of green space, leaving room for cities to improve their incorporation of equity in their planning for green spaces. This research has shown that cities conceptualize green spaces in a variety of ways and while there are several successes, there is also a lot of room for improvement in both green space planning and sustainability planning.</p>
452

A foggy desert| Equitable information flow for a fogwater system in southwest Morocco

Dodson, Leslie Lynn 18 July 2014 (has links)
<p> This dissertation describes the design, implementation and evaluation of a gender-inclusive information system linking rural women in Agni Hiya, Morocco and water project managers from the Association Dar Si-Hmad. This research was motivated by an interest in exploring the linkages between information and communication technologies (ICT), climate change, natural resource management and women's participation in community development in the drought-ridden A&iuml;t Baamrane region of southwest Morocco. The research investigates the potential for mobile phones to help address communication constraints that rural Berber women face, including culture, religion, and lack of digital literacy. These issues are relevant to the study and design of a gender-inclusive information system (the "Fog Phone") intended to help manage a fogwater distribution system that will deliver water from the Anti-Atlas Mountains to Berber villages. </p><p> The research investigates two similar groups of low-literate, marginalized rural Berber women from the same geographic community who have mobile phones. Technology-focused ethnographic research methods were used to first investigate the social, cultural and technical factors involved in mobile phone use by women employed in an Argan oil Cooperative. Findings from the Argan oil Cooperative study were then applied and expanded in a study of Berber women involved in the operation of the fogwater system. By virtue of their responsibilities as principal water gatherers and water users in the community, Berber women are key stakeholders in the fogwater system. Their continued involvement in water management was extended to the participatory design and development of the prototype Fog Phone. </p><p> Cultural conditions restricting communication between unrelated men and women led to an information system design that supported cultural, social, economic and technical constraints. The Fog Phone enabled women to report on the water system using a series of symbols that communicate water system status without violating cultural norms. In addition to an exploration of the relationship between gender and technology, this research explores related themes of climate change and environmental vulnerability as they pertain to women's lives and livelihoods, as well as the ability of rural Berber women to manage the environmental assets on which their livelihoods depend. </p><p> The contributions of this research include a prototype information system for the fogwater project; a better understanding of the mobile phone utility gap and its impact on the use of ICT by marginalized women in polyglot and oral-language dependent communities; and advances in the emerging practice of ICTs, Climate Change and Development (ICCD) by providing a case study of the linkages between mobile phones, water resources that are affected by climate change and women in rural communities involved in an environmentally sustainable development project in the Middle East and North Africa&mdash;a region that is largely missing from ICCD and overall ICT for Development research. </p>
453

Alchemical permaculture| Polishing the mirror between land and steward

Carter, Blair Robert 28 June 2014 (has links)
<p> This dissertation introduces the idea of alchemical permaculture: a new field that integrates ecopsychology, permaculture, and Jung's interpretation of alchemy&mdash;three areas of study and practice concerned with the transformative relationship(s) between planet Earth and its humans. An interdisciplinary approach to the research suggests that permaculture can become ecopsychological praxis if it is situated within the mythopoeic context of Jung's interpretation of alchemy. In addition to creating a very practical application of ecopsychology the conception of alchemy is dreamt onward, finding contemporary ecopsychological expression through permaculture landscape design. </p><p> Through comparative theoretical interpretation and narrative illustration the author emphasizes the interdisciplinary significance these three primary subjects have to offer each other and the present moment. Literature for comparison includes writings from a variety of ecopsychologists and historians of alchemy, scholars of Goethean science and Jungian psychology, and contemporary voices in the field of permaculture. Integrating these disciplines offers multiple perspectives to the science of ecology, provides a unique philosophical praxis to caring for the Earth, and highlights every act of land stewardship as an equal opportunity for both ecological and psycho-spiritual transformation. </p><p> Alchemical permaculture addresses the question "How can we dream the alchemical project forward, encouraging humanity as a whole to improve its ecological, psychological, and spiritual relationship with nature?" Alchemical permaculture integrates the practical designs, ethics, and values of permaculture with human psychology and spirituality. Alchemical permaculture illustrates what may be considered a branch of ecotherapy, or a kind of ecopsychological praxis, taking place in a broadened vessel of transformation that includes nature as well as psyche, helping to illuminate the mirroring relationships between inner and outer landscapes, between land and steward.</p>
454

Promoting sustainability of human livelihoods in the Ñeembucú ecoregion, Paraguay

Aveiro Talavera, Juan Jose 08 April 2010 (has links)
Paraguay has 35% of its territory covered by wetlands. One of the most important is the Ñeembucú wetland, situated mostly in the Department of Ñeembucú. Human activity in sectors such as agriculture, industry, transportation (roads), and energy (hydroelectric dams), exercise pressure on the environment and natural resources. Wetland conservation in particular needs to be prioritized, and this cannot happen without the involvement of the local community (Local Residents or Campesinos and Ranchers), which currently does not take place. Consequently, implementation of an ecosystem management approach is crucial to maintaining social, economic, and environmental wellbeing. The overall objective of this research project is to promote sustainability of human livelihoods in the Ñeembucú ecoregion, Paraguay, working in partnership with stakeholders in order to balance production with environmental priorities. The principal findings of this research study are presented according to each specific objective it addressed. (1) Determine the socio-economic situation in the Ñeembucú. Campesinos live in a very precarious situation. (2) Assess changes in areas of water bodies and other land cover. Human activities such as drainage, burning and deforestation, are causing a change in the water distribution and the vegetation complexity of the area. (3) Identify general changes in wildlife abundance in the Ñeembucú region with particular emphasis on indicators of ecosystem health. There is a decrease in the wildlife population in the Ñeembucú region. (4) Establish how these changes are associated with cattle and crop production in the San Juan del Ñeembucú District. Ranchers were the main builders of channels and roads. (5) Identify and establish further socioeconomic initiatives with ranchers and farmers that balance production and environmental priorities. There is a lack of networking and joint work among stakeholders. (6) Recommend approaches to enhance sustainability of the ecoregion. The main recommendations are: • Develop an adaptive management plan • Stimulate environmental education to create awareness • Encourage public participation • Create protected areas for wildlife • Support research • Motivate local tourism and create work alternatives • Create a sustainable and regional water management plan for the Ñeembucú Department • Offer government technical support to local producers
455

Sustainability Efforts of One Oil Company in Niger Delta of Nigeria

Anosike, Charles Afam 05 June 2014 (has links)
<p>Environmental degradation and socioeconomic dilemma continue to stigmatize oil production in the Niger Delta of Nigeria. Sustainability programs of oil companies often determine the improvement of living conditions in the region. This explanatory qualitative case study, guided by systems thinking theory and sustainable value framework, explored practitioners' perceptions of sustainability programs to identify its impact on business and the host communities. The research question was designed to address how sustainability efforts of a single oil company in the Niger Delta contributed to the business performance and the livelihood of the local people. Research data were gathered from a sample of 20 experienced sustainability practitioners of the oil company, partnering nonprofit organizations, and community leaders through face-to-face semistructured interviews. Data were segmented and categorized. The data analysis process revealed several themes regarding the challenges and shortfalls of sustainability programs in the region. The oil company's understanding of sustainability as programs and projects focused on preserving resources for future generations was not evident in practice. Findings from the study suggested the need for improved inclusiveness of people in driving sustainability projects. Inclusive sustainability should enhance the oil company's contemplation mechanism to ensure eco-saving thinking and processes, which could result in improved quality of life and business performance in the region. The research findings underscore the need for oil multinational corporations (MNCs) to use a business lens in viewing sustainability to achieve sustainable value. </p>
456

Green engineering| Sustainable biodiesel production using aboriginal chemical processes for self-empowerment in small tropical rural villages

Kuoh, Aleke 23 April 2014 (has links)
<p> This thesis attempted to synthesize biodiesel using indigenous materials and simple aboriginal techniques. Biodiesel requires plant oil, an alcohol and a catalyst. Coconut oil was extracted using the unrefined method and a 15% yield was obtained. Palm trees can produce ethanol when its palm juice is collected and is fermented to make palm wine. The distillation of palm wine separated an ethanol-water mixture with 35 wt% ethanol content. Calcium oxide, obtained from eggshells, is a catalyst that speeds up the transesterification reaction. Wasted eggshells undergo a calcinations process where calcium carbonate decomposes into calcium oxide and carbon dioxide. A scanning electron microscope confirmed the calcinations at the surface of the eggshells. The Fourier Transform Infrared Spectroscopy analysis of each step confirmed biodiesel synthesis. The successful creation of biodiesel from coconut oil, ethanol and calcium oxide creates a potential for people in small tropical rural villages to empower themselves with just local abundant resources.</p>
457

Comparative study of ammonia-based clean rail transportation systems for Greater Toronto area

Hogerwaard, Janette 01 April 2014 (has links)
Ammonia as a transportation fuel offers a carbon-free, hydrogen rich energy source that emits no greenhouse gases in combustion, and has no global warming potential. Furthermore, it may be produced from any renewable energy resource, and is a strong option for long term sustainability. Ammonia also provides a pathway towards a hydrogen economy, which is the long term goal for environmental sustainability. This thesis investigates the feasibility of integrating ammonia as a combustion fuel, hydrogen carrier, heat recovery and working fluid, and for indirect engine cooling, within locomotive propulsion systems for nine novel ammonia-based configurations. Thermodynamic, environmental, and economic analyses are conducted for a typical modern diesel-fueled locomotive and the proposed ammonia configurations. The study comparatively assesses potential long term solutions for sustainable, clean rail transportation. From the modeled results, the proposed systems operating with 50% of required fuel energy replaced by ammonia have a reduction in diesel fuel consumption from 0.211 kg/s to less than 0.10 kg/s. This is associated with a reduction in GHG emissions of more than 8 tonnes CO2eq for a typical daily locomotive duty cycle for commuter operation. Criteria air contaminants are reduced to below upcoming Tier 3 emission levels for NOx and HC emissions, and meet current levels for PM emissions. In total, ten locomotive propulsion systems are investigated including the diesel-fueled locomotive baseline, and the performance gains are considered against economic factors for fuel and equipment costs in a comparative assessment.
458

Developing and evaluating a socially critical approach to environmental education at philosophical and methodological levels in higher education

Plant, Malcolm January 2001 (has links)
No description available.
459

Cultivating Sustainability| Impact of Campus Agriculture Projects on Undergraduate Student Connections to Nature, Environmentally Responsible Behaviors, and Perceptions

LaCharite, Kerri 17 February 2015 (has links)
<p> The number of colleges and universities with campus agriculture projects in the US has grown from an estimated 23 in 1992 to 300 today with possibly increased numbers predicted. The profile emerging from campus agriculture projects looks a lot different from the traditional land grant colleges of agriculture. In spite of this emergent trend and staunch advocacy for campus agriculture projects, limited empirical research on agriculture-based learning in higher education exists outside agriculture degrees and theoretical work of scholars such as Liberty Hyde Bailey and David Orr. The purpose of this exploratory research was two-fold. First, prevailing characteristics and pedagogical objectives of campus agriculture projects were explored through a survey of all known US campus agriculture project managers and educators. Second, interviews, photo-elicitation, field observations, and use of the Connectedness to Nature Scale and Inclusion of Nature Scale were conducted during the summer of 2013 at Yale Farm and the University of Montana's Program in Ecological Agriculture and Society Farm (P.E.A.S.). At these two farms, I studied whether and in what ways did academic courses connected to campus agriculture projects at US colleges impact participating students' perceptions of and connection to nature. </p><p> This mixed methods research illustrates a re-visioning of how higher education is interfacing with agriculture and agriculture-based education beyond traditional land grant colleges of agriculture through attention to sustainability initiatives and pedagogies. Agriculture-based education and campus agriculture projects can distinctively impact students' perceptions of connectedness to nature through experiencing agriculture's role in establishing a new worldview. Data offers empirical evidence that campus agriculture projects deepen connection to place, and offers substitutes to anthropocentric beliefs and behaviors. While experiences at the campus agriculture projects motivated pro-environmental and social behaviors specific to farming, food, and the more-than-human community at the farms, participating students did not report an increase in cognitive connectedness to nature or behaviors beyond food, farming, or the more-than-human community at the farms.</p>
460

Incorporating Pavement Sustainability into Municiple Best Practices

Hertel, Attila January 2012 (has links)
Maintaining a functioning road network is a challenge in today’s society due to the financial restrictions faced by all levels of government. A means of determining how to efficiently spend their limited funding must be found. In addition, the concept of sustainable development is rapidly growing in today’s world pressuring municipalities towards operating in a more socially and environmentally friendly manner. Sustainability is broken down into three aspects which are economical, social and environmental. A truly sustainable pavement satisfies its functional requirements while aiding social and economic development and minimizing negative environmental impacts In response to the growing sustainability trend, the City of Markham is committed to incorporating sustainability into their daily operations. This thesis is the result of a research project with the City of Markham which is directed at incorporating sustainable practices into pavement engineering. The objective of this project is to provide a practical framework for incorporating pavement sustainability best practices into the pavement engineering operations at the City of Markham. This practical framework is developed through the completion of four primary objectives. The first main objective involves the completion of a comprehensive literature review that identifies and reviews the state-of-the-art sustainable pavement best practices. This literature review is divided into five pavement related categories which examine: materials, design and construction techniques, maintenance and rehabilitation techniques, sustainability evaluation systems and carbon footprinting. The second objective involves the quantification of the environmental, economic and carbon footprint impacts of the reviewed pavement best practices; this evaluation is conducted using PaLATE. PaLATE is an excel based software developed at the University of California for evaluating the economical and environmental impacts of various pavement technologies. The third objective involves the utilization of GreenPave for evaluating the environmental friendliness of the analysed pavement best practices. The green discounted life cycle cost (GDLCC) is calculated to include the economic aspect of sustainability. The final objective involves the development of project and network level frameworks. These two frameworks are connected which forms the final framework for incorporating sustainability into City of Markham’s pavement engineering operations. Guidelines for the proper utilization of the developed framework are provided. Through the completion of the literature review it is concluded that there is a wide variety of sustainable pavement technologies that range from project design to pavement decommission. PaLATE analysis results indicate that warm mix asphalt and full depth reclamation are the most environmentally friendly construction and rehabilitation techniques, respectively. Including recycled asphalt pavement (RAP) within pavement mix designs reduces both costs and environmental impacts. Excluding microsurfacing, full depth reclamation was the least expensive rehabilitation technique while hot mix asphalt with RAP was the cheapest construction technique. The same initial construction and rehabilitation techniques are evaluated using the GreenPave rating system. Pervious concrete scored the highest rating under the initial construction category with warm mix asphalt a close second. Cold in place recycling, cold in place with expanded asphalt and full depth reclamation all scored the highest under the rehabilitation category. In the future, the City of Markham may wish to alter the GreenPave rating system to be more reflective of municipal practices as the current version of GreenPave is weighted more heavily on high volume roads. To include the economical aspect, the green discounted life cycle cost (GDLCC) is calculated for all techniques. Hot mix asphalt with RAP and full depth reclamation resulted with the lowest GDLCC in the construction and rehabilitation categories, respectively. Finally, the recommended project and network level frameworks for incorporating sustainability into the pavement engineering practices at the City of Markham are proposed. On the project level, GreenPave evaluation and project level GDLCC aid decision makers in determining the most sustainable project alternative. On the network level, a pavement management system (PMS) serves as the platform. The role of a PMS is to provide recommendations on when and where rehabilitation is required and which rehabilitation technique is the most sustainable. The cost effectiveness and network level GDLCC indicators also aid pavement engineers in making network level decisions. The project and network level frameworks are connected to provide a complete pavement management framework for incorporating sustainability. The framework provides economic benefits by increasing the effectiveness of budget allocation; this is accomplished by maximizing the overall condition index gained to dollar spent ratio. The environmental benefits of this framework include the minimization of harmful gas emissions, project carbon footprints and energy and water consumption. The social issues of pavement projects are unique to each case and therefore must be addressed case by case. A common starting point when addressing these issues is provided.

Page generated in 0.0795 seconds