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  • 1
    Electronic Resource
    Electronic Resource
    The World Trade Organisation: Institution-Building in the Multilateral Trade System (1998)
    Oxford, UK and Boston, USA : Blackwell Publishers Ltd
    The @world economy 21 (1998), S. 0 
    Details
    ISSN: 1467-9701
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Law , Economics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1467-9701.00134
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  • 2
    Electronic Resource
    Electronic Resource
    Experimental Evaluation of Nonisothermal, First-Order Reaction Kinetics (1995)
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 8729-8734 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00130a004
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  • 3
    Electronic Resource
    Electronic Resource
    Ultrafast Photoinduced Electron Transfer in Rigid Porphyrin-Quinone Dyads (1995)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 117 (1995), S. 7202-7212 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00132a021
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  • 4
    Electronic Resource
    Electronic Resource
    Coordinated Photoinduced Electron and Proton Transfer in a Molecular Triad (1995)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 117 (1995), S. 1657-1658 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00110a030
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  • 5
    Electronic Resource
    Electronic Resource
    Reversible photochemistry in a chlorophyll model system (1995)
    Springer
    Photosynthesis research 45 (1995), S. 203-217 
    Details
    ISSN: 1573-5079
    Keywords: 5,5′-dithiobis(2-nitrobenzoic acid) ; hydrazines ; imidazole surfactants ; pheophytin ; photosensitization ; pigment association
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A reversible, endothermic photochemical redox reaction, sensitized by chlorophyll a and related compounds, has been demonstrated in a heterogeneous particulate system. The oxidant, 5,5′-dithiobis(2-nitrobenzoate) (DTNB), is photoreduced to the thiolate which remains primarily in an aqueous phase. Reductants are trisubstituted hydrazines, capable of oxidation to tetrazanes in the hydrocarbon particle phase. In the course of three days in the dark, thiolate and tetrazane react to regenerate DTNB in yields approaching 100%. A novelty of the present system is that photoreaction often takes place in discrete rate regimes, which are related to the presence of spectrally identifiable associations of chlorophyll pigments, Mg-containing and free bases. Among the associations that promote photochemical activity are those of chlorophyll and pheophytin with themselves and with each other. Perhaps more active are associations of a Mg rhodochlorin allomerization product of chlorophyll with its free base. Contributing to the associations is the stabilizing presence of amphiphiles that both ligate the Mg of chlorophyll strongly and hydrogen-bond to carbonyls: 2-tridecylimidazole, 2-tridecylimidazoline, and (2-aminoethyl)myristamide. Results of this work demonstrate the possibility of generating reaction center models in an artificial heterogeneous system, and of conducting reversible photochemical reactions with them.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00015561
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  • 6
    Electronic Resource
    Electronic Resource
    Nuclear resonant scattering using synchrotron radiation (1999)
    Springer
    Hyperfine interactions 120-121 (1999), S. 169-173 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A one-dimensional quantum model for nuclear resonant scattering using synchrotron radiation has been developed. This model gives a clear physical interpretation of the most prominent features of the coherent forward scattering process namely, the “speed-up” and “dynamical beat” effects. The form of the solution, for the time-dependent forward scattered intensity of the resonant radiation from the resonant medium after synchrotron radiation excitation, is a finite series. This unique solution can be interpreted in terms of a summation over all multiple forward scattering paths the radiation takes in reaching the detector. The resonant medium is represented by a linear chain of N effective resonant nuclei. The analysis starts from a coupled set of quantum mechanical equations for the relevant amplitudes in frequency space. Transformation to the time domain gives an analytical expression for the forward scattered intensity. The contribution of every order of the multiple scattering processes from the N effective nuclei appears naturally. The expression gives a clear physical understanding of all relevant aspects of resonant forward nuclear scattering. Furthermore, the present formalism allows the consideration of incoherent processes. This permits the study of processes in which there is gamma emission with recoil or emission of internal-conversion electrons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017098617489
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  • 7
    Electronic Resource
    Electronic Resource
    Nuclear ground states dressed with rf photons in Mössbauer–Zeeman 57Fe spectroscopy (1999)
    Springer
    Hyperfine interactions 120-121 (1999), S. 175-179 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have applied the “dressed” state concept, developed in quantum electronics, to the situation in which spin 1/2 ground-state nuclear levels are coupled by rf photons. In particular, we have studied Mössbauer spectroscopy when there is Zeeman splitting of the nuclear levels and a further interaction due to an applied rf-radiation field when the rf frequency is in the neighborhood of the ground-state splitting. The dressed-state approach treats the coupling of the ground nuclear Zeeman levels, due to a radio frequency field, by considering the total system made up of: nucleus, static magnetic field, and rf field as one global quantum system. The energy levels and corresponding eigenstates of the system are calculated as a function of the rf frequency and the magnitude of the rf magnetic flux density. Mössbauer spectra are calculated for the 57Fe case in which the source is subjected to both the static and radiation fields while the absorber nuclear levels are unsplit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017050701559
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  • 8
    Electronic Resource
    Electronic Resource
    Tourism and advertising: Evidence from Virginia beach (1998)
    Springer
    International advances in economic research 4 (1998), S. 384-397 
    Details
    ISSN: 1573-966X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract In recent years, the City of Virginia Beach, Virginia, has been spending more than two million dollars per year to promote tourism for the city. However, very little is known about the effects of such advertising on overnight visitors. On the basis of a survey of 1,200 overnight visitors during the summer of 1991, this study estimates the effect on tourism and the subsequent fiscal effect of tourism advertising expenditures. The study also calculates a rate of return from advertising from the perspective of a governmental revenue maximization objective function. This paper develops a travel cost model of the impact of advertising on overnight visitation to the city. The model provides, ceteris paribus, that advertising expenditures of 2.4 million dollars in 1991 resulted in an estimated 600,000 additional visitors. The paper concludes that if the City's objective is to maximize public profit, then it should expand its advertising budget.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02295692
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  • 9
    Electronic Resource
    Electronic Resource
    Preparation of high-strength/high-modulus regenerated cellulose fibers from lyotropic mesophases (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 58 (1995), S. 1365-1370 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Cellulose triacetate (CTA) fibers were spun from a 35% (w/v) solution of CTA (molecular weight, 95,000) in trifluoroacetic acid (TFA)/CH2CL2 (60/40, v/v) using laboratory-scale spinning equipment, an air gap, and cold MeOH as the coagulant. The resulting fibers, of large diameter (ca. 80 μm) were saponified with a variety of reagents. The regenerated cellulose fibers had tenacities and moduli as high as 1.6 and 50 GPa, respectively. The fiber properties did not show a dependence on which cellulose polymorph was present. It is suggestes that for highly oriented fibers, the cellulose molecular weight is the primary parameter that determines the strength and modulus. This emphasizes the advantages of using a lyotropic cellulosic mesophase which permits relatively low solution viscosities at high concentrations and high polymer molecular weights. © 1995 John Wiley & Sons, Inc.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1995.070580818
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  • 10
    Electronic Resource
    Electronic Resource
    Preparation of ultrahigh molecular weight polyacrylonitrile and its terpolymers (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 58 (1995), S. 2067-2075 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The synthesis of high molecular weight (in excess of 106 million Daltons) poly(acrylonitrile) and poly(acrylonitrile-co-methylacrylate-co-itaconic acid) is described. An inverse emulsion polymerization formulation with AIBN as the initiator was used. However, polymer precipitation occurred early in the polymerization. In each case, the molecular weight distribution was surprisingly narrow (M̄w/M̄n ∼ 1.5). Conversion vs. time plots with monomers containing the inhibitor had the “S” shape typical of emulsion polymerizations. The terpolymer composition and molecular weight were quite uniform throughout the polymerization. With inhibitor-free monomers, the initial molecular weights were very high (∼ 3 × 106 Daltons), but gelation occurred at ca. 50% conversion. There was an inverse relationship between the monomer inhibitor content and the polymer molecular weight. It is suggested that the growing polymer radicals are occluded in the precipitated polymer particles and are terminated by inhibitor diffusing into the particles, accounting for the narrow molecular weight distribution. © 1995 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1995.070581119
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