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  • American Institute of Physics (AIP)  (19)
  • Oxford University Press  (4)
  • Nature Publishing Group  (3)
  • American Geophysical Union (AGU)
  • American Association of Petroleum Geologists (AAPG)
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  • 1
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    Titanium dioxide/silicon hole-blocking selective contact to enable double-heterojunction crystalline silicon-based solar cell (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-03-27
    Description: In this work, we use an electron-selective titanium dioxide (TiO 2 ) heterojunction contact to silicon to block minority carrier holes in the silicon from recombining at the cathode contact of a silicon-based photovoltaic device. We present four pieces of evidence demonstrating the beneficial effect of adding the TiO 2 hole-blocking layer: reduced dark current, increased open circuit voltage (V OC ), increased quantum efficiency at longer wavelengths, and increased stored minority carrier charge under forward bias. The importance of a low rate of recombination of minority carriers at the Si/TiO 2 interface for effective blocking of minority carriers is quantitatively described. The anode is made of a poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) heterojunction to silicon which forms a hole selective contact, so that the entire device is made at a maximum temperature of 100 °C, with no doping gradients or junctions in the silicon. A low rate of recombination of minority carriers at the Si/TiO 2 interface is crucial for effective blocking of minority carriers. Such a pair of complementary carrier-selective heterojunctions offers a path towards high-efficiency silicon solar cells using relatively simple and near-room temperature fabrication techniques.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 2
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    Communication: Visible line intensities of the triatomic hydrogen ion from experiment and theory (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-12-23
    Description: The visible spectrum of H 3 + is studied using high-sensitivity action spectroscopy in a cryogenic radiofrequency multipole trap. Advances are made to measure the weak ro-vibrational transitions from the lowest rotational states of H 3 + up to high excitation energies providing visible line intensities and, after normalisation to an infrared calibration line, the corresponding Einstein B coefficients. Ab initio predictions for the Einstein B coefficients are obtained from a highly precise dipole moment surface of H 3 + and found to be in excellent agreement, even in the region where states have been classified as chaotic.
    Print ISSN: 0021-9606
    Electronic ISSN: 1089-7690
    Topics: Chemistry and Pharmacology , Physics
    Published by American Institute of Physics (AIP)
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  • 3
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    The plant is crucial: specific composition and function of the phyllosphere microbiome of indoor ornamentals (2016)
    Oxford University Press
    Details
    Publication Date: 2016-10-08
    Description: The plant microbiome is a key determinant of plant health. Less is known about the phyllosphere microbiota and its driving factors in built environments. To study the variability of the microbiome in relation to plant genotype and climate under different controlled conditions, we investigated 14 phylogenetically diverse plant species grown in the greenhouses of the Botanical Garden in Graz (Austria). All investigated plants showed specific bacterial abundances of up to 10 6 CFU cm –2 on their leaves. Bacterial diversity (H ' : 2.4–7.9) and number of putative OTUs (461–2013) were strongly plant species dependent . Statistical analysis showed a significantly higher correlation of community composition to plant genotype in comparison to the ambient climatic variables. In addition to the microbiome structure, we studied the antagonistic potential towards the foliar pathogen Botrytis cinerea as functional indicator. A high proportion of isolates (up to 58%) were able to inhibit pathogen growth by production of volatile organic compounds (VOCs). Data of structure and function were linked: frequently isolated VOCs producers (e.g. Bacillus and Stenotrophomonas ) were highly present in phyllosphere communities, which were dominated by members of Firmicutes . This study indicates that indoor ornamentals feature a distinct, stable microbiota on leaves irrespective of the indoor climate.
    Print ISSN: 0168-6496
    Electronic ISSN: 1574-6941
    Topics: Biology
    Published by Oxford University Press
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  • 4
    Electronic Resource
    Electronic Resource
    The thermal conductivity of ethane in the critical region (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 5454-5462 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: New experimental data are presented for the thermal conductivity of ethane. The thermal conductivity has been measured with a parallel-plate method as a function of temperature along eleven different isochores so as to obtain detailed information on the enhancement of the thermal conductivity in the critical region. The experimental results appear to be consistent with a recently proposed theoretical equation that accounts for both the asymptotic and nonasymptotic critical behavior of the thermal conductivity of fluids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458523
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of Hunger on Olfactory Acuity (1963)
    [s.l.] : Nature Publishing Group
    Nature 197 (1963), S. 108-108 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] There are conflicting opinions on whether olfactory acuity is a reliable, reproducible index of appetite, hunger, or satiety. According to Goetzl2, freely selected meals, as well as administration of sucrose solutions, were preceded by increased olfactory acuity and followed by decreased acuity. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/197108a0
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  • 6
    Electronic Resource
    Electronic Resource
    Photo-Polarography with a Flash-Lamp (1961)
    [s.l.] : Nature Publishing Group
    Nature 191 (1961), S. 1270-1272 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] PHOTO-POLAROGRAPHY, originating from the synthesis of photo-chemistry and polarography, records photokinetic-currents caused by photo-depolarizers, as well as their dark reactions. Photo-depolarizers in a restricted sense can be defined as follows. They originate from a photo-reaction, for ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1911270a0
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  • 7
    Electronic Resource
    Electronic Resource
    The thermal conductivity of argon in the critical region (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 6944-6963 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have measured the thermal conductivity of argon at temperatures from 302 K down to 150.8 K and at densities up to 25 mol L−1. The data were obtained with a steady-state method and we employed a guarded parallel-plate apparatus designed especially for investigating the thermal conductivity of fluids in the critical region. To interpret the data in the critical region a scaled crossover equation of state for argon in the critical region has been constructed. Equations for the thermal conductivity and viscosity of argon as a function of density and temperature are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468322
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  • 8
    Electronic Resource
    Electronic Resource
    A guarded parallel-plate instrument for measuring the thermal conductivity of fluids in the critical region (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 3466-3474 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A description is given of the construction and operating procedure of a parallel-plate apparatus for the measurement of the thermal conductivity coefficient of fluids. This instrument can be operated at pressures up to 150 MPa and at temperatures down to 77 K. The use of platinum resistance temperature sensors allows measurements with temperature differences between upper and lower plate as small as 1 mK, which together with the small plate separation of 155 μm, makes the instrument suitable for both the normal fluid region as well as for the region very close to the critical point. The complete working equations for the instrument are presented and evaluated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140494
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  • 9
    Electronic Resource
    Electronic Resource
    The thermal conductivity of methane in the critical region (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 10535-10555 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have measured the thermal conductivity of methane at temperatures from 308 K down to 190.585 K, which is just 21 mK above the critical temperature, and at densities up to 14 mol L−1. The data were obtained with an improved guarded parallel-plate cell with a new cryostat that was built especially for measurements in the critical region of methane. The new experimental data have a higher accuracy than those reported previously in the literature and enable us to examine the validity of the currently available theoretical description of the asymptotic and nonasymptotic behavior of the thermal conductivity of fluids in the critical region. Equations for the thermal conductivity of methane in a wide range of temperatures and densities are also presented. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472943
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  • 10
    Electronic Resource
    Electronic Resource
    The thermal conductivity of an equimolar methane–ethane mixture in the critical region (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 717-736 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have measured the thermal conductivity of an equimolar mixture of methane and ethane in the vicinity of the critical point. The new experimental data confirm that the thermal conductivity of a mixture does not diverge at the critical point but crosses over to a finite limiting behavior at the critical point. A quantitative representation of the thermal-conductivity data has been obtained in terms of a recently developed extension of the mode-coupling theory that incorporates the crossover between the behavior of the thermal conductivity close to and far away from the critical point. The same theory enables us also to predict other transport properties of the mixture in the vicinity of the critical point. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476611
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