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  • 1
    Digitale Medien
    Digitale Medien
    RADON DEPTH MIGRATION (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 41 (1993), S. 0 
    Details
    ISSN: 1365-2478
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Physik
    Notizen: A depth migration method is presented that uses Radon-transformed common-source seismograms as input. It is shown that the Radon depth migration method can be extended to spatially varying velocity depth models by using asymptotic ray theory (ART) to construct wavefield continuation operators. These operators downward continue an incident receiver-array plane wave and an assumed point-source wavefield into the subsurface. The migration velocity model is constrained to have longer characteristic wavelengths than the dominant source wavelength such that the ART approximations for the continuation operators are valid.This method is used successfully to migrate two synthetic data examples:〈list xml:id="l1" style="custom"〉1a point diffractor, and2a dipping layer and syncline interface model.It is shown that the Radon migration method has a computational advantage over the standard Kirchhoff migration method in that fewer rays are computed in a main memory implementation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2478.1993.tb00867.x
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  • 2
    Digitale Medien
    Digitale Medien
    Effects of Frozen Storage on the Ultrastructure of Bovine Muscle (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 46 (1981), S. 0 
    Details
    ISSN: 1750-3841
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Scanning electron microscopy (SEM) studies were carried out on bovine semitendinosus samples that were subjected both to long-term frozen storage and to repeated freeze-thaw cycles. Samples frozen at –18°C and stored up to 26 wk showed essentially no change in muscle ultrastructure. Samples frozen at liquid nitrogen temperature and stored at 2–3°C did show ice crystal damage within the muscle fiber. Repeated freeze-thaw produced essentially no change in muscle ultrastructure.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2621.1981.tb02998.x
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  • 3
    Digitale Medien
    Digitale Medien
    EFFECT OF TENSILE STRESS ON THE ULTRASTRUCTURE OF BOVINE MUSCLE (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 43 (1978), S. 0 
    Details
    ISSN: 1750-3841
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: The changes in ultrastructure of bovine semitendinosus, both raw and heated (90°C) and subjected to tensile stress, were determined by scanning electron microscopy. Stress parallel to the fiber axis resulted in the initial rupture of the muscle fiberendomysium sheath. Perpendicular stress caused initial rupture at the endomysium-perimysium junction with the muscle fibers remaining undisturbed. Similar observations were made on the muscle tissue heated to 90°C and subjected to tensile stress. Heating to 90°C does not alter completely the fibrous nature of the perimysium connective tissue. Some native type collagen fibrils were observed, even after the severe heat treatment. The effect of applied stress on components of the muscle tissue is an important consideration in the development of a more reliable test method for evaluation of meat tenderness.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2621.1978.tb15264.x
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  • 4
    Digitale Medien
    Digitale Medien
    A Microscopical Study of the Structure of Meat Emulsions and Its Relationship to Thermal Stability (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 46 (1981), S. 0 
    Details
    ISSN: 1750-3841
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Meat emulsions were examined by light microscopy to determine the relationships between structure and emulsion stability. Beef-meat based emulsions were prepared either by varying chopping temperature or by adding soy plastic fats of different hardness. Formation of fat channels was observed in uncooked emulsions prepared either at a chopping temperature of 26°C or with soft plastic fat of 0.25cm−1 hardness index. Such fat channel formations caused discontinuity of protein matrix, leading to fat separation during cooking and weakening of textural strength of products. Changes in fat globule size and distribution as affected by melting properties or hardness of fats were clearly reflected by changes in emulsion stability. Results suggest that emulsion stability is determined largely by the physical properties of protein matrix and fat incorporated. Stable emulsions were obtained with fats of appropriate melting properties and hardness and relatively cohesive protein matrix under given comminution conditions which allowed uniform fat distribution.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2621.1981.tb04486.x
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  • 5
    Digitale Medien
    Digitale Medien
    EFFECTS OF TYPES OF FAT AND OF RATES AND TEMPERATURES OF COMMINUTION ON DISPERSION OF LIPIDS IN FRANKFURTERS (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 36 (1971), S. 0 
    Details
    ISSN: 1750-3841
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: — The effect of time, temperature and rpm of comminution of emulsions was determined on the dispersion of approximately 25% of beef fat, pork fat or cottonseed oil in frankfurters. The numbers of lipid particles 5 μ or less in diameter increased in frankfurters containing either beef or pork fat as comminution was continued to higher temperatures, with pork fat dispersed more thoroughly. Fat tended to separate from frankfurters containing beef fat in particles 200 μ or more in diameter. In contrast, no specific degree of dispersion of particles 5 μ or less in diameter consistently indicated emulsion stability, or its lack. Increased rpm during comminution produced an increased dispersion of beef or pork fat. Under the same conditions pork fat was dispersed more finely than beef fat. Dispersion of cottonseed oil produced finely dispersed particles beyond the resolution of light microscopy, as was confirmed by electron microscopy which showed a substantial number of particles to be less than 1 μ in diameter.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2621.1971.tb04039.x
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  • 6
    Digitale Medien
    Digitale Medien
    COMBINED EFFECT OF NITRITE AND CHLORIDE ON THE ULTRASTRUCTURE OF MEAT AS SHOWN BY SCANNING ELECTRON MICROSCOPY (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 45 (1980), S. 0 
    Details
    ISSN: 1750-3841
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Scanning electron microscopy of the ultrastructure of cured beef has shown that the combination of sodium chloride and nitrite effects changes in the interfiber spaces not caused by either salt alone. The effect is attributed to catalysis of the nitrosation reaction through the formation of the more powerful nitrosating species, NOCI.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2621.1980.tb07512.x
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  • 7
    Digitale Medien
    Digitale Medien
    Identification and processing of proglucagon in pancreatic islets (1979)
    [s.l.] : Nature Publishing Group
    Nature 282 (1979), S. 260-266 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Immunoprecipitation and tryptic peptide analysis of newly synthesised proteins from rat islets have identified an 18,000 molecular weight (MW) protein as proglucagon. Conversion of this precursor was kinetically similar to the conversion of proinsulin and resulted in the formation of both ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/282260a0
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  • 8
    Digitale Medien
    Digitale Medien
    Theoretical aspects of ill-posed problems in statistics (1991)
    Springer
    Acta applicandae mathematicae 24 (1991), S. 113-140 
    Details
    ISSN: 1572-9036
    Schlagwort(e): Primary 62G05 ; secondary 65J10 ; Ill-posed problem ; operator inversion ; deconvolution ; biased sampling ; Wicksell's problem ; regression ; errors-in-variables ; mixtures ; empirical Radon transform
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract Ill-posed problems arise in a wide variety of practical statistical situations, ranging from biased sampling and Wicksell's problem in stereology to regression, errors-in-variables and empirical Bayes models. The common mathematics behind many of these problems is operator inversion. When this inverse is not continuous a regularization of the inverse is needed to construct approximate solutions. In the statistical literature, however, ill-posed problems are rather often solved in an ad hoc manner which obccures these common features. It is our purpose to place the concept of regularization within a general and unifying framework and to illustrate its power in a number of interesting statistical examples. We will focus on regularization in Hilbert spaces, using spectral theory and reduction to multiplication operators. A partial extension to a Banach function space is briefly considered.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00046889
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  • 9
    Digitale Medien
    Digitale Medien
    On sequential density estimation (1976)
    Springer
    Probability theory and related fields 36 (1976), S. 137-151 
    Details
    ISSN: 1432-2064
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract We consider the problem of sequential estimation of a density function f at a point x 0 which may be known or unknown. Let T n be a sequence of estimators of x 0 . For two classes of density estimators f n , namely the kernel estimates and a recursive modification of these, we show that if N(d) is a sequence of integer-valued random variables and n(d) a sequence of constants with N(d)/n(d)→ 1 in probability as d → 0, then f N(d) (T N(d) -f(x 0) is asymptotically normally distributed (when properly normed). We also propose two new classes of stopping rules based on the ideas of fixed-width interval estimation and show that for these rules, N(d)/n(d) → 1 almost surely and EN(d)/n(d) → 1 as d → 0. One of the stopping rules is itself asymptotically normally distributed when properly normed and yields a confidence interval for f(x 0) of fixed-width and prescribed coverage probability.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00533997
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  • 10
    Digitale Medien
    Digitale Medien
    The infrared spectrum and water binding of collagen as a function of relative humidity (1971)
    New York : Wiley-Blackwell
    Biopolymers 10 (1971), S. 1597-1604 
    Details
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The infrared spectra of undenatured bovine tendon collagen were investigated at 25°C and relative humidities from 0 to 95%. Suitable samples were prepared by forcing frozen suspensions of the material in distilled water through a stainless steel capillary. The samples were investigated by electron microscopy before and after the spectra were obtained to ascertain that no denaturation had taken place while the sample was exposed to infrared radiation. Temperature controlled absorption cells were constructed which permitted the passing of air with a known water content over the sample film. Gradual changes were observed in the frequencies and intensities of characteristic amide bands over the relative humidity range of 0 to 75%. These changes are particularly pronounced for the amide II band, associated with bending motions of peptide NH bonds. They lead to the conclusion that water molecules are gradually attached to peptide NH bonds within the triple helix over a wide range of relative humidity. Changes in CH deformation bands suggest that CH to O hydrogen bonding does occur and that it is more pronounced in collagen exposed to high relative humidity.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bip.360100913
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