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  • 1
    Electronic Resource
    Electronic Resource
    Organic photovoltaic cells. Correlations between cell performance and molecular structure (1984)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 88 (1984), S. 923-933 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j150649a019
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  • 2
    Electronic Resource
    Electronic Resource
    Electrical properties of semiconducting barium vanadate glasses (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 3355-3359 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The preparation of vanadate glasses containing barium oxide and their electrical properties in the temperature range of 80–500 K have been reported in this article. Analysis of the electrical properties has been made in the light of different hopping models. The multiphonon assisted hopping model of small polarons in the nonadiabatic regime, proposed by D. Emin [Phys. Rev. Lett. 32, 303 (1974)] have been observed to describe the temperature dependence of the conductivity data of these glasses over the entire temperature range of measurement. The parameters obtained from the fits of the experimental data to this model are reasonable and consistent with the glass composition. J. Schnakenberg's model [Phys. Status Solidi 28, 623 (1968)] is also consistent with the temperature dependence of the conductivity data. Mott's optical phonon assisted hopping model at high temperatures provides smaller values of the localization length. However, Mott's variable range hopping model is valid at low temperatures. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372349
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  • 3
    Electronic Resource
    Electronic Resource
    Prognostic significance of raised serum α-fetoprotein levels in twin pregnancies (1982)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 89 (1982), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary. Maternal serum α-fetoprotein (AFP) was measured during the second trimester in 219 twin pregnancies uncomplicated by neural-tube defects (NTD) and in 11 twin pregnancies discordant for NTD. Serum AFP levels were recorded in multiples of the median value (MOM) calculated from normal singleton pregnancies. Of the twin pregnancies uncomplicated by NTD 49% had AFP levels 〈2·5 MOM, 7·8% had levels 〉5 MOM and 59% of these were associated with either abortion, stillbirth or fetus papyraceous. In twin pregnancies with serum AFP levels 〈5 MOM an unsuccessful outcome was noted in only 4% (χ2, P〈0·05). There was a significant negative correlation between serum AFP levels and combined birthweights (r=0·954). All 11 pregnancies discordant for NTD had serum AFP values 〉5 MOM and this level appears to be a suitable cut-off point above which there should be further diagnostic investigations and monitoring of fetal well-being.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1982.tb05032.x
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  • 4
    Electronic Resource
    Electronic Resource
    Dynamics of lithium ions in bismuthate glasses (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 1503-1509 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The dynamics of lithium ions in lithium bismuthate glasses have been studied in the frequency range from 10 Hz to 2 MHz and in the temperature range from 323 to 543 K. The composition dependence of the dc (direct current) conductivity has been explained in terms of the structure of bismuthate glasses. The activation energy has been analyzed in the framework of the Anderson–Stuart model. An additional energy term arising from the Madelung constant of glasses and the polarizability of the bismuth ions has been suggested to explain the discrepancy between the calculated and experimentally obtained values. The relaxation mechanism of these glasses has been explored by employing the modulus and conductivity formalisms and the microscopic parameters obtained from the analysis have been compared. Furthermore, the stretched exponential relaxation parameter and the dc conductivity have been correlated with the decoupling index. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.480717
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  • 5
    Electronic Resource
    Electronic Resource
    Conductivity spectra of sodium fluorozirconate glasses (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 3243-3247 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have reported conductivity spectra at different temperatures for fluoride glasses of compositions 0.50ZrF4–(0.40−x)BaF2–0.10YF3–xNaF in the frequency range from 10 Hz to 2 MHz. We have analyzed the spectra using conductivity formalism and obtained the frequency exponent, concentration, and hopping frequency of charge carriers (F− ions) from the analysis. We have observed that the concentration of charge carriers is almost independent of temperature, but weakly dependent on composition, and the conductivity is essentially determined by the hopping frequency, i.e., the mobility. The frequency exponent is independent of temperature, but it shows very weak composition dependence. We have also presented a scaling of the conductivity spectra, which implies that the relaxation dynamics of charge carriers in fluoride glasses is independent of temperature and composition. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1343073
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  • 6
    Electronic Resource
    Electronic Resource
    A cytokinin complex from the developing fruits of Aegle marmelos (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 59 (1983), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Following ion-exchange, Sephadex LH-20 and paper chromatography of the methanolic extracts of young, developing fruits of Aegle marmelos Correa, cytokinin-like activity in the soybean callus assay was detected in six fractions. Of the four butanol-soluble compounds, two were tentatively identified as zeatin and zeatin riboside, and the others as zeatin glucoside and zeatin riboside glucoside. The major cytokinino of the butanol-insoluble fraction is probably zeatin nucleotide. The levels of compounds with cytokinin-like activity were high during the early phase, and low in the subsequent period of fruit growth. The activity resembling that of cytokinin glucoside increased with maturation of the fruit. The content of free cytokinins in the fruits was more than that released from the tRNA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1983.tb00752.x
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  • 7
    Electronic Resource
    Electronic Resource
    Rheological study of black coal-oil suspensions (1984)
    Springer
    Rheologica acta 23 (1984), S. 195-206 
    Details
    ISSN: 1435-1528
    Keywords: Black coal ; oil ; suspension ; ageing ; power-law model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract The rheological study of coal-oil suspensions is very important because of their application in many industries as alternative fuels to petroleum oil. In this work, the flow behaviour of black coal-oil suspension was studied for a range of coal volume fractions from 0.0378 to 0.427. Shear stresses were measured for shear rates up to 200 s−1 using a Weissenberg Rheogoniometer. All the suspensions behaved like non-Newtonian liquids and exhibited significant increases in apparent viscosity on storage. The flow behaviour of both freshly prepared and aged suspensions was able to be described by power-law models. A model similar to that given by Chong was used to establish relation between the relative apparent viscosity and coal volume fraction for freshly prepared as well as all aged suspensions. A correlation was also established between ageing time and maximum coal volume fraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01332075
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  • 8
    Electronic Resource
    Electronic Resource
    The role of Cosmic rays in hydrostatic equilibrium of the galactic halo (1983)
    Springer
    Astrophysics and space science 92 (1983), S. 37-44 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The hydrostatic equilibrium of the gas field system is studied in the halo. Cosmic-ray distribution is considered independently from the magnetic field on the basis of the diffusion model of the propagation of cosmic rays. We show that the cosmic rays extend in the halo to distances of a few kiloparsecs. The magnetic field decreases slowly with height above the galactic plane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00653586
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  • 9
    Electronic Resource
    Electronic Resource
    Positron-hydrogen-like-ion scattering (1984)
    Springer
    The European physical journal 318 (1984), S. 19-23 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Scattering of positrons by hydrogen-like-ions (He+, Li2+, Be3+ and B4+) has been studied using two variants of the polarized orbital method. The positronium formation channel has not been included in the calculations,s-wave phase shifts obtained using the two variants differ appreciably from each other. Moreover, the polarized orbitals-wave phase shifts fore +-B4+ scattering differ from the corresponding variational results qualitatively in the low energy region. The differential cross sections are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02117210
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  • 10
    Electronic Resource
    Electronic Resource
    A general hospital psychiatric unit inpatient facility (1982)
    Springer
    Social psychiatry and psychiatric epidemiology 17 (1982), S. 155-159 
    Details
    ISSN: 1433-9285
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Patients admitted to the inpatient ward of a psychiatric unit in a general hospital have been studied with regard to their clinical characteristics, reasons for admission and discharge patterns. The results indicate that patients are most often admitted for the management of acute disturbance and detailed diagnostic evaluation and they are discharged in a semi-improved state. Implications of such a service pattern are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00582966
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