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  • 1
    Electronic Resource
    Electronic Resource
    Detection of streptomycins in raw milk by an antibody-capture immunoassay
    Amsterdam : Elsevier
    Analytica Chimica Acta 275 (1993), S. 313-316 
    Details
    ISSN: 0003-2670
    Keywords: Antibiotics ; Antibody-capture test ; Enzymatic methods ; Enzyme-linked immunosorbent assay ; Immunoassay ; Milk ; Streptomycins
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0003-2670(93)80307-7
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  • 2
    Electronic Resource
    Electronic Resource
    Structural properties of hydrogenated carbon-nitride films produced by ion-beam-assisted evaporation of the molecular precursor C4N6H4 (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 7852-7859 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Hydrogenated carbon-nitride films (CNx:H) were deposited by evaporation of aza-adenine (8-aza-6-aminopurine, C4N6H4) and irradiated during film growth by a nitrogen ion beam with energies of 25, 50, and 100 eV. The relationship between the deposition conditions and the chemical bonding structure was investigated by x-ray photoelectron and infrared spectroscopies. The mass density of the films was estimated from the C 1s plasmon energy and the optical properties were examined by ultraviolet–visible spectroscopy. The infrared spectra indicate that in the case of evaporated films, the molecular structure of aza-adenine is preserved without substantial nitrogen loss (N/C(approximate)1.3). With increasing energy of the assisting nitrogen ion beam, the structure is subsequently transformed into an amorphous phase. This transition is accompanied by an increasing nitrogen loss down to N/C(approximate)0.8, a decrease of the optical band gap, and an increase of the film density. The known molecular structure of aza-adenine permits the reconstruction of the C 1s and N 1s core-level spectra with deconvoluted spectral components representing the different bonding environments of C and N atoms present in the molecule. The spectral components are identified by comparing the experimental data with theoretical calculations of the corresponding binding energies. By analysis of the spectral changes induced by the nitrogen ion beam with increasing energies, it is possible to study the microstructural modifications of the material. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1372371
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  • 3
    Electronic Resource
    Electronic Resource
    Infrared analysis of deuterated carbon–nitrogen films obtained by dual-ion-beam-assisted-deposition (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 1065-1067 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The isotopic effect on the infrared spectra is used to determine the existence of nitrogen–hydrogen bonds in amorphous carbon–nitrogen alloys (a-CNx) prepared by dual-ion-beam-assisted deposition. The deuteration experiments and the evolution of the infrared spectra upon atmospheric exposure show that hydroxyls are incorporated from atmospheric moisture. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122115
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  • 4
    Electronic Resource
    Electronic Resource
    Identification of structural changes in carbon–nitrogen alloys by studying the dependence of the plasmon energy on nitrogen concentration (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 3521-3523 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of nitrogen on the valence-electron plasmon energy in amorphous carbon–nitrogen alloys (a-C1−xNx) is used to identify structural changes in the material. The samples were prepared by dual-ion-beam-assisted deposition and studied in situ by x-ray photoemission spectroscopy. The plasmon energy of the alloy goes through a maximum above 15–20 at.% nitrogen concentration. This behavior is correlated with structural changes obtained in a semiempirical quantum chemical calculation on graphite-like carbon clusters, randomly substituted by nitrogen. At that concentration, the geometry optimization shows that the graphite-like conformation is unstable against the buckling of the structure. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122823
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  • 5
    Electronic Resource
    Electronic Resource
    Titanium boron nitride coatings of very high hardness
    Amsterdam : Elsevier
    Surface & Coatings Technology 68-69 (1994), S. 194-198 
    Details
    ISSN: 0257-8972
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0257-8972(94)90159-7
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  • 6
    Electronic Resource
    Electronic Resource
    Thin layer activation for wear studies in compressors
    Amsterdam : Elsevier
    Nuclear Inst. and Methods in Physics Research, B 27 (1987), S. 458-461 
    Details
    ISSN: 0168-583X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0168-583X(87)90528-3
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  • 7
    Electronic Resource
    Electronic Resource
    Facet of regular 0–1 polytopes (1975)
    Springer
    Mathematical programming 8 (1975), S. 179-206 
    Details
    ISSN: 1436-4646
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract The role of 0–1 programming problems having monotone or regular feasible sets was pointed out in [6]. The solution sets of covering and of knapsack problems are examples of monotone and of regular sets respectively. Some connections are established between prime implicants of a monotone or a regular Boolean functionβ on the one hand, and facets of the convex hullH of the zeros ofβ on the other. In particular (Corollary 2) a necessary and sufficient condition is given for a constraint of a covering problem to be a facet of the corresponding integer polyhedron. For any prime implicantP ofβ, a nonempty familyF(P) of facets ofH is constructed. Proposition 17 gives easy-to-determine sharp upper bounds for the coefficients of these facets whenβ is regular. A special class of prime implicants is described for regular functions and it is shown that for anyP in this class,F(P) consists of one facet ofH, and this facet has 0–1 coefficients. Every nontrivial facet ofH with 0–1 coefficients is obtained from this class.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01580442
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  • 8
    Electronic Resource
    Electronic Resource
    Interpretation of short-period oscillations in ionospheric group heights (reply) (1978)
    [s.l.] : Nature Publishing Group
    Nature 274 (1978), S. 511-512 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] DEVLIN et al. REPLY-Short period, small amplitude oscillations observed in group height were claimed in our paper1 to be associated with a sporadic-E layer being observed. It was also suggested that the actual phenomenon responsible may be sound waves or waves associated with plasma instabilities. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/274511b0
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  • 9
    Electronic Resource
    Electronic Resource
    Small-amplitude, short-period waves in the E and F regions of the ionosphere (1977)
    [s.l.] : Nature Publishing Group
    Nature 268 (1977), S. 319-320 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Figure la shows an ionogram obtained by the phase path ionosonde using the pulse synthesis technique. A blanketing sporadic E layer is apparent and apart from effects due to interference at 2.5 MHz and 3.5 MHz, the virtual height is constant within 293 m over the frequency range 2-7 MHz. The value ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/268319a0
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  • 10
    Electronic Resource
    Electronic Resource
    Boolean regression (1995)
    Springer
    Annals of operations research 58 (1995), S. 201-226 
    Details
    ISSN: 1572-9338
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract We take a regression-based approach to the problem of induction, which is the problem of inferring general rules from specific instances. Whereas traditional regression analysis fits a numerical formula to data, we fit a logical formula to boolean data. We can, for instance, construct an expert system for fitting rules to an expert's observed behavior. A regression-based approach has the advantage of providing tests of statistical significance as well as other tools of regression analysis. Our approach can be extended to nonboolean discrete data, and we argue that it is better suited to rule construction than logit and other types of categorical data analysis. We find maximum likelihood and bayesian estimates of a best-fitting boolean function or formula and show that bayesian estimates are more appropriate. We also derive confidence and significance levels. We show that finding the best-fitting logical formula is a pseudo-boolean optimization problem, and finding the best-fitting monotone function is a network flow problem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02032132
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