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  • 1
    Electronic Resource
    Electronic Resource
    Zero-field NMR studies of physically admixed Co/Co-ThO2 ZSM-5 catalysts (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 4361-4363 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Co-ZSM-5 and Co-ThO2-ZSM-5 catalysts are a particularly promising group of bifunctional zeolite catalysts used for the conversion of synthesis gas to gasoline-range hydrocarbons. Catalytic properties of these materials, such as activity and selectivity, depend upon the amount of the cobalt on the medium-pore zeolite ZSM-5, as well as upon the presence of promoters such as ThO2. These studies were undertaken to ascertain the effect of thoria upon the magnetic and structural nature of these catalysts. Zero-field nuclear magnetic resonance measurements have been made on a series of zeolite cobalt and cobalt-thoria catalysts with three different concentrations of Co (3, 6, and 9 wt. %). The catalysts were prepared by making physical admixtures of precipitated cobalt, or cobalt-thoria, and ZSM-5. The amount of thoria introduced ranged from 0.5 to 1.5 wt. %. After reduction of the catalyst samples, the normal metallic cobalt resonance line at 213.0 MHz (fcc) and the fault lines at 215.5 and 218.6 MHz were observed. In the unpromoted catalysts, a line at 210.7 MHz, which is lower than the fcc line frequency, and another line at 221.6 MHz, which is higher than the hcp line frequency, were observed. When the promoter thoria was added, there was a systematic absence of the hcp line in the unused catalyst. Previous catalytic tests had shown that small amounts of the promoter thoria (0.4 wt. %) significantly increase the liquid hydrocarbon yields. The change in catalytic behavior can be related to the changes in crystallite species and crystallite size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338421
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  • 2
    Electronic Resource
    Electronic Resource
    X-ray reflectivity of an Sb delta-doping layer in silicon (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 5105-5108 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: X-ray reflectivity measurements were made on Si(001) crystals containing a delta-doping layer of Sb atoms a few nanometers below the surface. The measurements show the Sb doping profile to be abrupt towards the substrate side of the sample and to decay towards the surface with a characteristic decay length of 1.01 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347047
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  • 3
    Electronic Resource
    Electronic Resource
    Erratum: Evidence for the existence of a negatively charged hydrogen species in plasma-treated n-type Si [Appl. Phys. Lett. 56, 949 (1990)] (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 2377-2377 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104293
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  • 4
    Electronic Resource
    Electronic Resource
    Evidence for the existence of a negatively charged hydrogen species in plasma-treated n-type Si (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 949-951 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We demonstrate the drift of a donor-passivating hydrogen species under the action of the electric field in the depletion region of a reverse-biased Au/n-Si Schottky diode hydrogenated by exposure to a low-frequency discharge. The redistribution is explained by the unidirectional drift of a negatively charged passivating species and is confirmed by secondary-ion mass spectrometry profiling in deuterated diodes. The results are consistent with the presence of an acceptor level for hydrogen in n-type Si, and are analogous to the situation in p-type Si where drift experiments reveal the existence of positively charged hydrogen donor species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102633
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  • 5
    Electronic Resource
    Electronic Resource
    Injection and drift of a positively charged hydrogen species in p-type GaAs (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 1457-1459 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Transport of the acceptor-passivating hydrogen species in p-type GaAs has been observed in reverse bias annealed Al Schottky diode samples. The motion of the positively charged hydrogen across the depletion region of these diodes is confirmed both by changes in the electrically active acceptor profiles with time, and by direct measurement of the migration using secondary-ion mass spectrometry on deuterated samples. Acceptor passivation is unstable under minority-carrier injection by illumination at 25 °C. Hydrogen injection into p-type GaAs during boiling in water or etching in H2SO4:H2O2:H2O has also been demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102497
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  • 6
    Electronic Resource
    Electronic Resource
    The evaluation of the apple cultivars Bramley's Seedling, Suntan and East Malling A 3022 for the production of apple slices (1983)
    Oxford, UK : Blackwell Publishing Ltd
    International journal of food science & technology 18 (1983), S. 0 
    Details
    ISSN: 1365-2621
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Comparison of slices of the apple cultivars Bramley's Seedling, Suntan and East Malling A 3022 showed that both objective and subjective assessments were considerably influenced by: (1) preparatory procedure (blanching time, sugar or malic-acid additions), and (2) storage (whether as whole fruit or as previously prepared frozen slices). The addition of sugar and acid and method of storage produced a more marked effect than differences due to cultivar. Although Bramley's Seedling could be distinguished objectively from the other two cultivars, primarily on the basis of appearance, this had little influence when it came to making hedonic assessments. Products from Suntan and East Malling A 3022 were considered at least as good in a number of respccts as those from Bramley's Seedling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1983.tb00308.x
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  • 7
    Electronic Resource
    Electronic Resource
    Consumer reaction to processed Suntan apples (1983)
    Oxford, UK : Blackwell Publishing Ltd
    International journal of food science & technology 18 (1983), S. 0 
    Details
    ISSN: 1365-2621
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: A pilot consumer survey showed apple rings prepared from Suntan apples to be liked, particularly with respect to appearance and taste. People, on the whole, preferred a whiter product; texture was acceptable, although respondents would have preferred it to be firmer. Age appeared to be the major demographic factor influencing response, the colour of the product being more favourable to the 45 and over age group, with the 16–24 age group preferring a less sweet product.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1983.tb00297.x
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  • 8
    Electronic Resource
    Electronic Resource
    Scoring methods used in the sensory analysis of foods and beverages at Long Ashton Research Station (1982)
    Oxford, UK : Blackwell Publishing Ltd
    International journal of food science & technology 17 (1982), S. 0 
    Details
    ISSN: 1365-2621
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: The development of a scientific programme of research into sensory quality of fruits and beverages at Long Ashton Research Station has necessitated improvements in the evaluation methods used. It has not only meant the development of precisely defined vocabularies for describing products and methods for obtaining data from consumers, but also means of scoring the intensity of attributes. This paper describes the various scoring methods used at Long Ashton, ranging from nominal to interval and ratio, and their applicability to particular problems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1982.tb00173.x
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  • 9
    Electronic Resource
    Electronic Resource
    Pumps as Turbines and Induction Motors as Generators for Energy Recovery in Water Supply Systems (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Water and environment journal 12 (1998), S. 0 
    Details
    ISSN: 1747-6593
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Pressure-reducing valves, which dissipate energy, are often used in water supply systems to regulate the downstream pressure levels. If a reverse running pumpset is installed alongside such a valve, most of the dissipated energy can be recovered.This paper describes a system of this type which has recently been installed by North West Water, with advice and specialized equipment supplied by the Nottingham Trent University Micro-Hydro Group. The power produced by the energy-recovery system is used to run and monitor a remote potable-water dosing plant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1747-6593.1998.tb00169.x
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  • 10
    Electronic Resource
    Electronic Resource
    Optimization of colour in commercial port blends (1986)
    Oxford, UK : Blackwell Publishing Ltd
    International journal of food science & technology 21 (1986), S. 0 
    Details
    ISSN: 1365-2621
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Simple quantitative descriptive analysis coupled with ratio scaling techniques were used by a consumer panel for the objective assessment of fifteen ports, derived from blending Ruby, Tawny and White ports in varying proportions, for redness, brownness and intensity of colour. Deviation of the amounts of these attributes from those in the consumer's concept of an ideal port, both for Ruby and Tawny drinkers, was determined in relation to blend composition and L*, a* and b* values. Inverse simultaneous regression procedures showed the ports which best satisfied the two consumer subsets (Ruby and Tawny drinkers), in respect to all the sensory attributes, had chroma values of 23.0 and 21.8, and hue angles of 37.3 and 45.1° respectively. This corresponded to L*, a* and b* values of 86.13, 18.24 and 13.9 for the Ruby drinkers, and 92.1,15.3 and 15.4 for the Tawny drinkers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1986.tb00423.x
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