1,333 research outputs found

    Enabling Effective Community Forestry Through a National Co-Management Program: The Case of Thailand's Community Forestry Program

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    Rural communities have engaged in the governance and management of forest resources by developing institutions that prevent overexploitation of common-pool resources and maintain the basis of their livelihoods. Effective community forestry relies on several conditions, including secure tenure rights, an enabling regulatory framework, strong governance, and sufficient knowledge. Worldwide, customary community forests have gained legal recognition in the wake of tenure reforms with the expectation that this formalization would enhance tenure security. In Thailand, the Royal Forest Department (RFD) began in 2000 to legally recognize community forests and share formal rights and responsibilities with communities through a national co-management program. This program was further expanded to support the development of community forest networks. The RFD could not provide extension services to approximately 10,000 community forests and aimed to improve the information sharing among communities. The objective of this dissertation was to investigate whether both program elements, i.e. forest tenure formalization and community forest networking, could provide better conditions for community forests. It was of particular interest whether the formalization could enhance the security of tenure rights, which could affect the willingness of communities to invest in forest conservation. The intervention to enhance inter-communal networks is of particular relevance for the international community due to its uniqueness. A diverse set of methodological approaches was required to address each objective. A quasi- experimental design was used to analyze the effect of community forest management on deforestation and the impact of the subsequent formalization based on statistical matching and panel data analyses. Comparative case studies were investigated subsequently to better understand the relationships between formalization, tenure security, forest-related conflicts, and deforestation. Social network modeling was used to analyze how networking organizations affected the flow of information between communities. The findings indicated that community in Thailand have effectively protected their forests even before receiving legal recognition. The formalization procedure has improved the relationship between communities and RFD officials but it has not enhanced their ability to prevent forest encroachment as support from the State has been insufficient in the case of tenure conflicts. In the absence of state-led extension services, established networking organizations enabled communities to provide mutual support as indicated by the enhanced inter-communal flow of information on a provincial level. However, networking organizations still depended on external funding and support during their initial establishment. The co-sharing of forest tenure rights and responsibilities between communities and the RFD might have helped to build trust and acceptance. This study has, however, confirmed that formalization can only provide limited benefits to forest-managing communities if they remain unprotected from forest encroachment because their formal tenure rights are not being enforced. Thus, communities might become disillusioned if their rights are not protected against more powerful actors. The community forest networks have the potential to increase the political influence of these communities while also enhancing their capacity to share and develop new knowledge. However, communities require more financial resources as their responsibilities increase while their ability to generate financial returns remains legally limited. Thus, the regulatory framework can be changed to balance communal rights and responsibilities or expanded by developing financing mechanisms to fund community-based conservation activities, such as forest patrols and fire prevention measures.:Acknowledgements Summary List of Figures List of Tables 1 Enabling effective community forestry 1.1 Potential outcomes of community forestry 1.2 Conditions for effective community forestry 1.3 Policy interventions in Asia’s community forests 2 Justification and objectives 2.1 Impact of formalization on tenure security and local institutions 2.2 Impact of registration on forest loss 2.3 Impact of network administration organization on information-sharing 3 The history of community-based forest management models in Thailand 3.1 Expansion of state control over forestland 3.2 Forest Village Programs 3.3 Community forestry discourse 3.4 Community Forest Program 3.5 Conclusions 4 Designing impact evaluations for policy interventions 4.1 Quantitative impact evaluation 4.2 Qualitative impact evaluation 4.3 Social network analysis 5 The impact of community forest formalization on tenure security and forest co- management in Thailand 5.1 Abstract 5.2 Introduction 5.3 Background 5.4 Methodology 5.5 Results 5.6 Discussion 5.7 Conclusion 6 Community-based forest management moderates impact of deforestation pressure regardless of formalization in Thailand 6.1 Abstract 6.2 Introduction 6.3 Methodology 6.4 Results 6.5 Discussion 6.6 Conclusion 7 Network administrators facilitate information sharing among communal forest organizations in Thailand 7.1 Abstract 7.2 Introduction 7.3 Methodology 7.4 Results 7.5 Discussion 7.6 Conclusion 8 Synthesis, implications and outlook 8.1 Synthesis of key results 8.2 Policy implications 8.3 Future research 8.4 Critical reflections on research methodology Supplementary material for Chapter 6 Supplementary material for Chapter 7 References Supplementary materia

    Gravity Resonance Spectroscopy and Einstein-Cartan Gravity

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    The qBounce experiment offers a new way of looking at gravitation based on quantum interference. An ultracold neutron is reflected in well-defined quantum states in the gravity potential of the Earth by a mirror, which allows to apply the concept of gravity resonance spectroscopy (GRS). This experiment with neutrons gives access to all gravity parameters as the dependences on distance, mass, curvature, energy-momentum as well as on torsion. Here, we concentrate on torsion.Comment: Contributed to the 11th Patras Workshop on Axions, WIMPs and WISPs, Zaragoza, June 22 to 26, 2015, 6 pages, 4 figure

    Erfolgreiche Fischereiforschung im Jahr 1998 zur Sicherung der Ressourcen

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    Das Aufgabengebiet der Bundesforschungsanstalt für Fischerei umfasst alle Forschungsaktivitäten, die zur Erreichung der politischen Ziele des Bundesministeriums für Ernährung, Landwirtschaft und Forsten (BML) im Bereich der Fischerei und ihrer Erzeugnisse erforderlich sind. Alle Arbeiten der Forschungsanstalt sind international eingebunden in die Ziele der gemeinsamen Fischereipolitik der EU, sowie die Arbeiten des Internationalen Rats für Meeresforschung. Die Bundesforschungsanstalt gliedert sich in fünf Institute

    Range Tracing

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    In this report, we tackle the problem of merging an arbitrary number of range scans (depth images) into a single surface mesh. The mesh-based representation is superior to point-based approaches since it contains important connectivity information. Most previous mesh-based merge methods, however, lose surface details by using simplifying intermediate surface representations (e.g.\ implicit functions). Such details are essential for further processing steps, especially for feature-preserving reconstruction methods. Our method preserves all information (connectivity and the original measurement positions) as edges and vertices of a merged surface mesh. It avoids aliasing and smoothing artifacts, adapts to the local scanner sampling and is independent of the overlap size of the input range scans. The algorithm consists of only two basic operations and is therefore simple to implement. We evaluate the performance of our approach on highly detailed real-world scans acquired with different devices

    Experiments with Gravitationally-bound Ultracold Neutrons at the European Spallation Source ESS

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    AbstractExperiments with gravitationally-bound ultracold neutrons have made substantial progress in the last decade. They have been contributing to answer scientific questions ranging from gravity tests at micron distances, the direct search for dark matter particles as axions, and dark energy realizations. Comparing the present accuracy of around 10-14 eV - achieved with a gravity resonance spectroscopy technique - with the by many orders of magnitude expected smaller size of inevitable systematic errors, one may conclude that the present experiments are heavily restricted by the limited strength of today's ultracold neutron (UCN) sources.We propose to build a dedicated UCN source at the European Spallation Source in order to perform experiments with gravitationally-bound UCN

    Efficient Surface Reconstruction for Piecewise Smooth Objects

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    In this report we present a new surface reconstruction technique from unstructured point clouds for piecewise smooth objects, such as scans of architectural and other man-made artifacts. The new technique operates in three conceptual steps: First, a set of basis functions is computed and a topology is established among these functions that respect sharp features using a RANSAC technique. Second, a linearized, statistically motivated optimization problem is solved employing this discretization. Lastly, an implicit function based meshing technique is employed to determine a clean, manifold mesh representation. The main benefit of our new proposal in comparison to previous work is its robustness and efficiency, which we examine by applying the algorithm to a set of synthetic and real-world benchmark data sets

    Techniques for targeted Fermi-GBM follow-up of gravitational-wave events

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    The Advanced LIGO and Advanced Virgo ground-based gravitational-wave detectors are projected to come online 2015-2016, reaching a final sensitivity sufficient to observe dozens of binary neutron star mergers per year by 2018. We present a fully-automated, targeted search strategy for prompt gamma-ray counterparts in offline Fermi-GBM data. The multi-detector method makes use of a detailed model response of the instrument, and benefits from time and sky location information derived from the gravitational-wave signal.Comment: 2012 Fermi Symposium proceedings - eConf C12102
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