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Joop J. Van Hemmen – One of the best experts on this subject based on the ideXlab platform.

  • An experimental study to investigate the feasibility to classify paints according to neurotoxicological risks: occupational Air Requirement (OAR) and indoor use of alkyd paints.
    The Annals of occupational hygiene, 2005
    Co-Authors: Derk H. Brouwer, Nettie De Pater, Christian Zomer, Marc. W. M. Lurvink, Joop J. Van Hemmen


    The concept of occupational Air Requirement (OAR), representing the quantity of Air required to dilute the vapor concentration in the work environment resulting from 11 product to a concentration below the occupational exposure limit (OEL), was considered to have potential to discriminate between paints that can and cannot be used safely. The OAR is a simple algorithm with the concentration of volatile organic compound (VOC) in the paint, a discrete evaporation factor and the neurotoxicological effects-based OEL. Conceptually, OAR categories of paints for construction and maintenance applications could be identified that can be applied manually without exceeding OELs with no appreciable room ventilation. Five painters volunteered in an exposure study aimed at testing the OAR approach in practice. Total exposure to VOC was assessed in 30 experiments during the application of 0.5 l of paint in a defined ‘standard indoor paint job’. Fifteen paints were prepared, reflecting differences in solvents (percentage, volatility, toxicity) with a range of OAR levels from 43 to 819 m3/l. Exposure was assessed by personal Air sampling (PAS). In addition, real-time Air monitoring was performed. All tests were conducted at minimum ventilation rate (≤0.33 h-1). PAS results were expressed as percentage of the nominal OEL and ranged from 8 to 93% for high solids and from 38 to 168% for conventional paints. In general, higher VOC contents resulted in higher exposure. High volatile paints showed a statistically significant faster increase of VOC concentration with time compared with paints containing low volatile solvents. A significant relationship between OAR value and exposure was observed (R2 = 0.73). The experiments indicate that OAR-based classification of paints predicts and discriminates risk levels for exposure to neurotoxic paint-solvents in indoor painting fAirly well. © 2005 British Occupational Hygiene Society Published by Oxford University Press. Chemicals / CAS: Air Pollutants, Occupational; Solvents

Berna Hascakir – One of the best experts on this subject based on the ideXlab platform.

  • laboratory screening tests on the effect of initial oil saturation for the dynamic control of in situ combustion
    Fuel Processing Technology, 2015
    Co-Authors: Denis Aleksandrov, Berna Hascakir


    Abstract There are two main goals of this study: to investigate the performance variations of in-situ combustion (ISC) with the change in initial oil saturation (IOS) through laboratory screening tests and to determine mechanisms for maintaining the dynamic control of ISC by varying the injected Air rate in an oil field which has heterogeneously distributed IOS. Thus, we start with the determination of the optimum IOS value for ISC with five combustion tube tests at identical experimental conditions but at different IOS values and the IOS value used in the best performing experiment is decided to be the optimum IOS value for the given experimental conditions. Then, the AirRequirement for the field-scale application is calculated analytically. The AirRequirements for the experiments which exhibit poorer performance are normalized according to the value obtained for the optimum IOS case. We observed that the fuel-deposition amount is highly affected by the IOS and decreases with IOS. Our findings show that the constant Air rate used in the experiments is responsible for the performance change in ISC for varying IOS. Therefore, the Air rate should be adjusted according to the estimated fuel deposition amount for the dynamic control of ISC for the field application.

Shi Hong-li – One of the best experts on this subject based on the ideXlab platform.

  • Study on Old Mine Ventilation System Management and Transformation
    Coal and Chemical Industry, 2015
    Co-Authors: Shi Hong-li


    The characteristics of the mine ventilation system aging period were analyzed,combined with Tong’er old mine ventilation system management and transformation practice,the principles and management of the transformation were expounded.The operation of the mine ventilation system was put forward to achieve the unity of the rationality and economy.The operation of the mine ventilation system is on the best running state or not,should take integrated mine Air Requirement,the main fan operation state,supply Air volume,ventilation,power consumption etc.into account.