Wetland ecology, Nutrient cycles, Rapid prototyping, Geographic information systems, Computer simulation, Ecosystem services, and Metadata
Abstract: Great interest currently exists for developing ecosystem models to forecast how ecosystem services may change under alternative land use and climate futures. Ecosystem services are diverse and include supporting services or functions (e.g., primary production, nutrient cycling), provisioning services (e.g., wildlife, groundwater), regulating services (e.g., water purification, floodwater retention), and even cultural services (e.g., ecotourism, cultural heritage). Hence, the knowledge base necessary to quantify ecosystem services is broad and derived from many diverse scientific disciplines. Building the required interdisciplinary models is especially challenging as modelers from different locations and times may develop the disciplinary models needed for ecosystem simulations, and these models must be identified and made accessible to the interdisciplinary simulation. Additional difficulties include inconsistent data structures, formats, and metadata required by geospatial models as well as limitations on computing, storage, and connectivity. Traditional standalone and closed network systems cannot fully support sharing and integrating interdisciplinary geospatial models from variant sources. To address this need, we developed an approach to openly share and access geospatial computational models using distributed Geographic Information System (GIS) techniques and open geospatial standards. We included a means to share computational models compliant with Open Geospatial Consortium (OGC) Web Processing Services (WPS) standard to ensure modelers have an efficient and simplified means to publish new models. To demonstrate our approach, we developed five disciplinary models that can be integrated and shared to simulate a few of the ecosystem services (e.g., water storage, waterfowl breeding) that are provided by wetlands in the Prairie Pothole Region (PPR) of North America. [ABSTRACT FROM AUTHOR]
Renewable Energy: An International Journal. Dec2013, Vol. 60, p739-745. 7p.
Hydroelectric power plants, Wind turbines, Precision casting, Aerial propellers, Solidification, Computer simulation, Hydraulic turbines, and Thickness measurement
Abstract: The runner blade of a propeller turbine has a complex profile and an uneven thickness, which causes severe and unpredictable problems during the manufacture procedure. This paper describes the manufacture procedure which includes advance computer solidification simulation, lost wax casting process and machining processes of the runner of a pico hydraulic propeller turbine. The runner was manufactured in C99350 nickel bronze alloy. This alloy possesses high toughness along with excellent resistance to cavitation and erosion. The runner can be a viable option for electricity generation in not interconnected zones (NIZ) of the national interconnected electric system in developing countries and can be manufactured locally. [Copyright &y& Elsevier]
García–Vite, Pedro Martín, Soriano–Rangel, Carlos Abraham, Rosas–Caro, Julio Cesar, and Mancilla–David, Fernando
Renewable Energy: An International Journal. Feb2017, Vol. 101, p431-436. 6p.
Renewable energy sources, Energy conversion, Direct currents, Cascade converters, Computer simulation, and Pulse width modulation transformers
This paper proposes a dc–dc converter with quadratic voltage gain able to drain ripple–free current from the source at a selectable duty cycle. Because of these features, the topology proposed herein is of special interest in renewable energy systems which have low voltage generation sources and are sensitive to current ripple from converters. The paper discusses the converter's principle of operation, focusing on modeling and design guidelines. The topology is validated through computer simulations and hardware prototyping. [ABSTRACT FROM AUTHOR]
Environmental monitoring, Systems design, Computer interfaces, Computer simulation, Socioeconomics, Algorithms, Electronic data processing, and Computer network protocols
Abstract: Integrated environmental modelling is gaining momentum for addressing grand scientific challenges such as monitoring the environment for change detection and forecasting environmental conditions along with the consequences for society. Such challenges can only be addressed by a multi-disciplinary approach, in which socio-economic, geospatial, and environmental information becomes inter-connected. However, existing solutions cannot be seamlessly integrated and current interaction paradigms prevent mainstream usage of the existing technology. In particular, it is still difficult to access and join harmonized data and processing algorithms that are provided by different environmental information infrastructures. In this paper we take a novel approach for integrated environmental modelling based on the notion of inter-linked resources on the Web. We present design practices for creating resource-oriented interfaces, driven by an interaction protocol built on the combination of valid linkages to enhance resource integration, accompanied by associated recommendations for implementation. The suggested resource-oriented approach provides a solution to the problems identified above, but still requires intense prototyping and experimentation. We discuss the central open issues and present a roadmap for future research. [Copyright &y& Elsevier]
Renewable Energy: An International Journal. Mar2009, Vol. 34 Issue 3, p801-806. 6p.
Wind power, Computer simulation, Unsteady flow, and Induction generators
Abstract: Due to its simple construction, ruggedness and low cost, the induction generator driven by a wind turbine and feeding power to the grid appears to be an attractive solution to the problem of growing energy demand in the context of environmental issues. This paper investigates the integration of such a system into the main utility using RT-Lab™ (Trademark of Opal-RT Technologies) software package running on a simple off-the-shelf PC. This real-time simulation platform is now adopted by many high-tech industries as a real-time laboratory package for rapid control prototyping and for Hardware-in-the-Loop applications. Real-time digital simulation results obtained during contingencies, such as islanding and unbalanced faults are presented and analysed. [Copyright &y& Elsevier]