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  • 1
    Publication Date: 2011-08-18
    Description: Metamaterials are artificial multifunctional materials that acquire their material properties from their structure, rather than inheriting them directly from the materials they are composed of, and they may provide novel tools to significantly enhance the sensitivity and resolution of sensors. In this paper, we derive the dispersion relation of a cylindrical dielectric waveguide loaded on a negative permeability metamaterial (NPM) layer, and compute the resonant frequencies and electric field distribution of the corresponding Whispering-Gallery-Modes (WGMs). The theoretical resonant frequency and electric field distribution results are in good agreement with the full wave simulation results. We show that the NPM sensor based on a microring resonator possesses higher sensitivity than the traditional microring sensor since with the evanescent wave amplification and the increase of NPM layer thickness, the sensitivity will be greatly increased. This may open a door for designing sensors with specified sensitivity.
    Electronic ISSN: 1424-8220
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Published by MDPI Publishing
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  • 2
    Publication Date: 2017-12-05
    Description: Sustainability, Vol. 9, Pages 2239: Environmental Risks or Costs? Exploring Flooding and the Urban Heat Island Effect in Planning for Policymaking: A Case Study in the Southern Taiwan Science Park Sustainability doi: 10.3390/su9122239 Authors: Peiwen Lu Yang-Ting Shen Tang-Huang Lin This study examined a specific case of planning for policymaking in response to two physical environmental issues: flooding and the urban heat island effect (UHI). The Southern Taiwan Science Park (STSP) was selected as a case study. Data were primarily collected through interviews as well as through policy review. The assessment showed significant differences in policymaking when comparing these two issues. The issue of flooding was considered and managed well. The UHI, however, was poorly considered or ignored altogether in policymaking, even though it has shown an increasing trend over the last decades, to a greater degree in the STSP than in the city centre. The results implied that the neoliberal approach to planning of decision-making performed better in managing risks (i.e., flooding and relevant disasters which had occurred in the past) than costs (i.e., the UHI and the future threats resulting from development). The STSP’s spatial development strategy, underpinned by the neoliberal approach with an agenda for maximising economic growth, was questionable for environmental management toward resilience.
    Electronic ISSN: 2071-1050
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by MDPI Publishing
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  • 3
    Publication Date: 2017-02-10
    Description: An imaging sensor-based intelligent Light Emitting Diode (LED) lighting system for desk use is proposed. In contrast to the traditional intelligent lighting system, such as the photosensitive resistance sensor-based or the infrared sensor-based system, the imaging sensor can realize a finer perception of the environmental light; thus it can guide a more precise lighting control. Before this system works, first lots of typical imaging lighting data of the desk application are accumulated. Second, a series of subjective and objective Lighting Effect Evaluation Metrics (LEEMs) are defined and assessed for these datasets above. Then the cluster benchmarks of these objective LEEMs can be obtained. Third, both a single LEEM-based control and a multiple LEEMs-based control are developed to realize a kind of optimal luminance tuning. When this system works, first it captures the lighting image using a wearable camera. Then it computes the objective LEEMs of the captured image and compares them with the cluster benchmarks of the objective LEEMs. Finally, the single LEEM-based or the multiple LEEMs-based control can be implemented to get a kind of optimal lighting effect. Many experiment results have shown the proposed system can tune the LED lamp automatically according to environment luminance changes.
    Electronic ISSN: 1424-8220
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Published by MDPI Publishing
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  • 4
    Publication Date: 2018-07-12
    Description: Energies, Vol. 11, Pages 1816: Analysis of Energy Accumulation and Dissipation of Coal Bursts Energies doi: 10.3390/en11071816 Authors: Xiaohan Yang Ting Ren Alex Remennikov Xueqiu He Lihai Tan Coal bursts are a serious dynamic hazard for underground coalmines, and they attract the extensive interest of studies from mining and geotechnical researchers worldwide. More recently, coal-burst incidents were reported in some Australian coalmines as a result of inadequate geological assessment of coal-burst hazards. The coal-burst process is closely associated with the accumulation of elastic energy and the rapid dissipation of kinetic energy. This paper introduces the essential geological conditions for energy accumulation, and the likely precursors for rapid energy dissipation leading to coal burst, which can be used by Australian coalmines to determine their coal-burst risk accordingly. Different energy forms and their transformations during the coal-burst process are introduced in detail in this paper. The dominant geological factors resulting in the accumulation of massive energy are analyzed, and the likely precursors associated with the instant release of elastic energy are discussed.
    Electronic ISSN: 1996-1073
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by MDPI Publishing
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