Ozone is an internationally recognized criteria air pollutant, and remains a major concern despite more than 25 years of regulation at the national level. A method developed by Derwent and coworkers (1996, 1998) and initially applied in the United Kingdom (UK), was to define POCPs (photochemical ozone creation potentials), as a means of ranking, in a semi-quantitative way, the contributions of ...

In addition to the different technologies of silicon solar cells in crystalline form, TOPCon have an exceptionally great efficiency 26%, accomplished by manufacturing scale technique for industrialization, and inordinate cell values 732.3 mV open-circuit voltage (Voc) a fill factor (FF) 84.3%. The thickness tunnel oxide, which is less than 2 nm cell, primarily affects electrical properties cell...

Since enactment of the 1990 amendments to the Clean Air Act, the control and removal of volatile organic compounds (VOCs) from contaminated air streams have become a major public concern (1). Consequently, considerable interest has evolved in developing more economical technologies for cleaning contaminated air streams, especially dilute air streams. Biofiltration has emerged as a practical air...

Four hydroxynitrates (R(OH)R’ONO2) representative of atmospheric volatile organic compound (VOC) oxidation products were synthesized, nebulized and sampled into an Aerodyne High Resolution Time of Flight Aerosol Mass Spectrometer (HR-ToF-AMS). The resulting mass spectrum was used to evaluate calibration factors for elemental analysis of organic nitrates by AMS, and to determine the distribution...

Recent developments in the following areas are briefly reviewed: a) the electrical structure of grain boundaries in CdTe absorbers, b) impurities and non-stoichiometry in CdTe solar cells and c) use of Sb2Te3 in contacts to CdTe. Nominally identical solar cells fabricated using 99.999% pure CdTe feedstock from two different suppliers were compared. Differences in the photovoltaic response and a...

The separation of concerns (SOC), as a conceptual tool, enables us to manage the complexity of software systems that we develop. The benefits of this paradigm, such as reuse, enhanced quality and adaptability, have been key drivers of its adoption. Modern software systems and applications take advantage of the technologies built around this paradigm, in which a client program can access differe...

Perovskite oxides have emerged as promising alternatives for the supported Platinum group metal catalysts total oxidation of propane and other volatile organic compounds (VOC). Here, we report a surface modification method to improve activity La0.8Sr0.2CoO3 monolithic using diluted oxalic acid etching. The treatment decreases light-off temperatures by 30–40 °C. Experimental DFT investigations r...

The sensitivity of ozone production to precursor emissions was investigated under five different meteorological conditions in the Mexico City Metropolitan Area (MCMA) during the MCMA-2006/MILAGRO field campaign using the gridded photochemical model CAMx driven by observation-nudged WRF meteorology. Precursor emissions were constrained by the comprehensive data from the field campaign and the ro...

Employing IT as the key enable technology, virtual organization (VO) is primarily characterized as being a network of independent, geographically dispersed organizations (member organization) providing electronic services via Internet. To align these services effectively, one of the main challenges is to model cooperation in VO and provide correspondent management tools. Here we present a VOC (...

UNLABELLED Although widely used in air quality regulatory frameworks, the term "volatile organic compound" (VOC) is poorly defined. Numerous standardized tests are currently used in regulations to determine VOC content (and thus volatility), but in many cases the tests do not agree with each other, nor do they always accurately represent actual evaporation rates under ambient conditions. The pa...