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  • 1
    Electronic Resource
    Electronic Resource
    Optical nonlinearities of inorganic metal cluster μ3-MoSe4Ag3(PPh3)3Cl (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 1225-1229 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Optical nonlinearity and dynamic response of a novel inorganic metal cluster (μ3-MoSe4)Ag3(PPh3)3Cl were studied. Large optical limiting effect was observed with the inorganic metal cluster (μ3-MoSe4)Ag3(PPh3)3Cl dissolved in CH2Cl2. We also proved that nonlinear scattering contributes much to its optical limiting performance, which counts for nearly 75% of the total nonlinear energy loss used. The dynamic response of the cluster when pumped at high fluence was tested by a standard time-resolved pump-probe technique. The effective third-order susceptibility χ(3) for this sample was determined in a standard backward degenerate four wave mixing experiment with pump fluence lower than limiting threshold Fth. The conjugate signal intensity tends to saturate when the incident fluence rolls over this value (Fth) in spite of the fact that large optical limiting effect was observed in this fluence region, which implies that the nonlinearity mechanism is different for these two regions. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373807
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  • 2
    Electronic Resource
    Electronic Resource
    Single-component and multicomponent adsorption equilibria on activated carbon of methylcyclohexane, toluene, and isobutyl methyl ketone (1990)
    s.l. : American Chemical Society
    Industrial & engineering chemistry research 29 (1990), S. 220-231 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie00098a012
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  • 3
    Electronic Resource
    Electronic Resource
    Prediction of equilibrium data of adsorptions from liquid mixtures (1990)
    s.l. : American Chemical Society
    Industrial & engineering chemistry research 29 (1990), S. 560-564 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie00100a011
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  • 4
    Electronic Resource
    Electronic Resource
    Laboratory Study of Air Sparging: Air Flow Visualization (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water monitoring & remediation 13 (1993), S. 0 
    Details
    ISSN: 1745-6592
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Laboratory flow visualization experiments, using glass beads as the porous medium, were conducted to study air sparging, an innovative technology for subsurface contaminant remediation. The purpose of these experiments was to observe how air flows through saturated porous media and to obtain a basic understanding of air plume formation and medium heterogeneity effects. The experiments indicate that air flow occurring in discrete, stable channels is the most probable flow behavior in medium to fine grained water saturated porous media and that medium heterogeneity plays an important role in the development of air channels. Several simulated scales of heterogeneities, from pore to field, have been studied. The results suggest that air channel formation is sensitive to the various scales of heterogeneities. Site-specific hydrogeologic settings have to be carefully reviewed before air sparging is applied to remediate sites contaminated by volatile organic compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6592.1993.tb00455.x
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  • 5
    Electronic Resource
    Electronic Resource
    Modelling of Emission and Re-emission of Volatile Organic Compounds from Building Materials with Indoor Air Applications (1993)
    Oxford, UK : Munksgaard International Publishers
    Indoor air 3 (1993), S. 0 
    Details
    ISSN: 1600-0668
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Medicine
    Notes: Polymer materials and their additives are today ever present in our daily surroundings. These materials have been found to emit a number of different volatile organic compounds (VOCs) into the ambient air, thus affecting the quality of the indoor air VOCs with detectable concentrations are exchanged between the different materials and indoor air. Materials present in the system act as sorbents as well as sources of emission, depending on the concentration of the VOCs in the air at a specific time. This work demonstrates a method of studying the phenomena of absorption/re-emission. A hypothetical room that resembles a furnished office has been studied. A PVC flooring material was used as a primary emission source in a system where materials such as wood, paint, cloth, chipboard, and cellulose were present. Mass transfer in the solid materials was assumed to be by diffusion. The results show that the mechanism of absorption/re-emission of volatiles may extend the time of residence in an indoor system considerably. A person working in this environment could risk longer exposure to toxic volatiles than if there were no absorption/re-emission effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0668.1993.t01-3-00002.x
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  • 6
    Electronic Resource
    Electronic Resource
    The Effect Of A Passive Adsorption Sheet On Reducing Organic Pollutants In Indoor Air (1993)
    Oxford, UK : Munksgaard International Publishers
    Indoor air 3 (1993), S. 0 
    Details
    ISSN: 1600-0668
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Medicine
    Notes: The effect of a thin, passive, adsorbent sheet containing activated carbon on reducing the concentration of volatile organic compounds in indoor air is investigated. A mathematical model is established to describe the conditions in a hypothetical room containing building materials, furniture, an activated carbon sheet, etc. The results of the modelling show that the activated carbon sheet can reduce the concentration of the organic vapour in the room air by a factor of 1.6 – 200, depending on the resistances to mass transfm in the laminar gas film surrounding the activated carbon sheet and in the voids of the sheet. The maximum value 200 is a theoretical limit, if both the film and void resistances could be eliminated. Minimization of the film and void resistances is important to achieve high effect of the activated carbon sheet. This could be done by e.g. dividing a single sheet into several smaller pieces, hanging the sheets at some places where the airflow is relatively high, and making the sheets thin and loose. For some of the model parameters, estimated or assumed values were used in the calculations. Experimental work regarding sorption equilibria and mass transport properties of the species and materials involved is needed for more accurate results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0668.1993.t01-3-00003.x
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  • 7
    Electronic Resource
    Electronic Resource
    Modelling of a Passive Adsorption Sheet to Purify Indoor Air (1993)
    Oxford, UK : Munksgaard International Publishers
    Indoor air 3 (1993), S. 0 
    Details
    ISSN: 1600-0668
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Medicine
    Notes: In this paper the use of a thin adsorbent sheet composed of activated carbon particles to purify indoor air is modelled. A loose sheet with high porosity appears more effective than a dense one. The carbon sheet can be replaced by a fresh sheet after a certain period of use, thus keepilzg the volatile organic compound (VOC) level low in the remaining years. The model has been used to predict the optimal replacement time. Binary VOCs are modelled. The results turn out to be close to those from single component calculations, which suggests that the efficiency of the carbon sheet to one VOC is negligibly affeaed by the presence of other VOCs at ppb levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0668.1993.00013.x
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  • 8
    Electronic Resource
    Electronic Resource
    Excitons in semiconductor quantum wells with a small band offset: Exact numerical solution to the envelope function
    Amsterdam : Elsevier
    Solid State Communications 67 (1988), S. 911-914 
    Details
    ISSN: 0038-1098
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0038-1098(88)90455-3
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  • 9
    Electronic Resource
    Electronic Resource
    A Conceptual Model of Field Behavior of Air Sparging and Its Implications for Application (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water monitoring & remediation 14 (1994), S. 0 
    Details
    ISSN: 1745-6592
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: The basic physics of air flow through saturated porous media are reviewed and implications arc drawn for the practical application of air sparging. A conceptual model of the detailed behavior of an air sparging system is constructed using elements of multiphase flow theory and the results of recent experimental work. Implications of the conceptual model on air sparging topics are discussed. The meaning of radius of influence in the context of air sparging is found to be ambiguous. The hydrodynamic effects of air sparging such as mounding of ground water and flow impedance are explored. Limitations on rates of remediation and operational strategics for improving sparging effectiveness are examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6592.1994.tb00491.x
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  • 10
    Electronic Resource
    Electronic Resource
    Picosecond Z-scan study of bound electronic Kerr effect in LiNbO3 crystal associated with two-photon absorption (1997)
    Springer
    Applied physics 64 (1997), S. 659-662 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 42.65; 42.70; 42.10
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 3 crystal have been measured using Z-scan technique with picosecond pulses at 532 nm. The nonlinear absorption coefficient and nonlinear refractive index are determined to be 2.5×10-10 cm/W and 5.3×10-15 cm2/W, respectively. Both sign and magnitude of the measured refractive nonlinearity are considerably different from the reported Z-scan results in LiNbO3 obtained with cw laser beam at 514 nm. The nonlinearities in LiNbO3 induced by 532 nm picosecond pulses are believed to be mainly due to two-photon absorption and bound electronic Kerr effect associated with the two-photon absorption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050229
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