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    Article

    Dual Isotopic (O & N) Approach in the Assessment of NO3 Pollution in an Urban River

    Deterioration of urban waterways has become a major environmental concern as management and recreational goals are often hampered by poor water quality. The San Antonio River (TX, USA), whose upper reaches, in...

    Pride T. Abongwa, Walter Den, Aarin Teague in Water, Air, & Soil Pollution (2022)

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    Article

    Chemical and Carbon Isotopic Characterization of a Karst-Dominated Urbanized Watershed: Case of the Upper San Antonio River

    Urbanization and agriculture are two key factors that place demands on water resources and serve as sources of anthropogenic pollution into inland waterways. The San Antonio River, which is sourced from a kars...

    Pride T. Abongwa, Walter Den, Aarin Teague in Archives of Environmental Contamination an… (2022)

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    Article

    Evolution of a Deep Fluid in a Surficial Environment Using Stable Carbon and Sulfur Isotopes: Case of the Transitional Zone of the Edwards Aquifer in South Central Texas

    The Edwards Aquifer in south central Texas (USA) features a distinct fault line defining the freshwater and saline water zones. We aim to elucidate the evolutionary behavior of carbon and sulfur emanating from...

    Pride T. Abongwa, Walter Den in Water, Air, & Soil Pollution (2021)

  4. Article

    Open Access

    Chitosan Encapsulation of FerrateVI for Controlled Release to Water:Mechanistic Insights and Degradation of Organic Contaminant

    Tetraoxy-anion of iron in +6 oxidation state (FeVIO42−, FeVI), commonly called ferrate, has shown tremendous potential as a green oxidative agent for decontaminating water and air. Encapsulation of solid potassiu...

    Bo-Yen Chen, Hsuen-Wen Kuo, Virender K. Sharma, Walter Den in Scientific Reports (2019)

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    Article

    Implementation of an Environmental Quality and Harmful Gases Monitoring System in Cloud

    The improvement of environmental quality is aligned with the betterment of life quality. Poor air quality has a greatest impact on people health, it links to cancer, long-term harm to cardiovascular and respir...

    Chao-Tung Yang, Shuo-Tsung Chen in Journal of Medical and Biological Engineer… (2019)

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    Article

    Spirulina maxima for Phenol Removal: Study on its Tolerance, Biodegradability and Phenol-Carbon Assimilability

    Microalgae-based bioremediation processes pose dual abilities of simultaneous CO2 fixation through photosynthesis and degradative effect on environmental pollutants. This study intends to investigate the toleranc...

    Hui-Chun Lee, Mengshan Lee, Walter Den in Water, Air, & Soil Pollution (2015)

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    Article

    Characterizing and locating air pollution sources in a complex industrial district using optical remote sensing technology and multivariate statistical modeling

    Emissions of volatile organic compounds (VOCs) are most frequent environmental nuisance complaints in urban areas, especially where industrial districts are nearby. Unfortunately, identifying the responsible e...

    Pao-Erh Paul Chang, Jen-Chih Rena Yang in Environmental Science and Pollution Resear… (2014)

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    Article

    Construction and Application of an Intelligent Air Quality Monitoring System for Healthcare Environment

    Indoor air quality monitoring in healthcare environment has become a critical part of hospital management and policy. Manual air sampling and analysis are cost-inhibitive and do not provide real-time air quali...

    Chao-Tung Yang, Chi-Jui Liao, Jung-Chun Liu, Walter Den in Journal of Medical Systems (2014)

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    Article

    The relationship between typhoons' peripheral circulation and ground-level ozone concentrations in central Taiwan

    Surface data of meteorological parameters (wind speed, wind direction, and mixing height) and air pollutant concentrations (O3, NO, and NO2) were collected for a 92-day period associated with typhoon formation in...

    Wan-Li Cheng, Li-Wei Lai, Walter Den in Environmental Monitoring and Assessment (2014)

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    Article

    An analytical investigation of a sequence of unusual springtime ozone episodes over metropolitan Taichung in 2007

    This study investigated the potential factors contributing to a series of ozone (O3) episodes in the Taichung metropolis, which occurred during the first half of May 2007. Surface data of the meteorological param...

    Wan-Li Cheng, Li-Wei Lai, Walter Den, Shu-Ying Wang in Meteorology and Atmospheric Physics (2012)

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    Article

    Preparation of N-doped TiO2 photocatalyst by atmospheric pressure plasma process for VOCs decomposition under UV and visible light sources

    The nitrogen doped (N-doped) titanium dioxide (TiO2) photocatalyst was prepared by the atmospheric-pressure plasma-enhanced nanoparticles synthesis (APPENS) process operated under normal temperature, i.e. the die...

    Chienchih Chen, Hsunling Bai, Sue-min Chang in Journal of Nanoparticle Research (2007)