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  • 1
    Digitale Medien
    Digitale Medien
    THE MECHANISM OF CARBOHYDRATE OXIDATION. XVIII.* THE OXIDATION OF CERTAIN SUGARS WITH SILVER OXIDE IN THE PRESENCE OF POTASSIUM HYDROXIDE (1936)
    s.l. : American Chemical Society
    The @journal of organic chemistry 01 (1936), S. 1-16 
    Details
    ISSN: 1520-6904
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/jo01230a001
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  • 2
    Digitale Medien
    Digitale Medien
    The equilibrium low-temperature structure of icef a@f ) (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 424-428 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Following the discovery of a first-order phase transition in annealed KOH-doped ice at 72 K, which was identified as the order–disorder transition associated with the proton positions, a structural study has now been made. Powder neutron diffraction measurements on KOD-doped D2O above and below the phase transition, together with x-ray diffraction measurements, reveal a partial ordering of the hydrogen atoms at low temperatures. The equilibrium structure of ice at low tempertures has orthorhombic symmetry, space group Cmc21, with the same lattice as the high-temperature Ih (P63/mmc) modification. The structure is polar and there is evidence that the ordered domains are less than about 40 A(ring) in dimension.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.448763
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  • 3
    Digitale Medien
    Digitale Medien
    On a Radiant Energy Recorder (1885)
    [s.l.] : Nature Publishing Group
    Nature 32 (1885), S. 233-234 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] SUNSHINE-RECORDERS may be divided into two classes, **-* viz., those which roughly measure solar energy by the burning of card and wood, and those which, by means of some photographic process, yield a record of the relative intensity of some more or less definite ray. The principle of the ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/032233a0
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  • 4
    Digitale Medien
    Digitale Medien
    The Appeal for Skeletons of Wild Animals (1872)
    [s.l.] : Nature Publishing Group
    Nature 6 (1872), S. 535-535 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] I AM glad to see that Mr. Moseley has started the question of the acquisition of skeletons of wild animals, a subject which has hitherto been too much neglected by those who have charge of museums. Mr. Moseley might have put his case more strongly than he has done; for not only are the two museums ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/006535a0
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  • 5
    Digitale Medien
    Digitale Medien
    Utricularia (1880)
    [s.l.] : Nature Publishing Group
    Nature 22 (1880), S. 318-318 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] CAN any of the readers of NATURE inform me whether the sharp clicking noises produced on removing Utriculariæ from the water (particularly for the first time) have been noticed or described? I have not succeeded in determining the species, as the plants are not yet in ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/022318d0
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  • 6
    Digitale Medien
    Digitale Medien
    Sea-Lions (1875)
    [s.l.] : Nature Publishing Group
    Nature 12 (1875), S. 212-212 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] IT will be no doubt interesting to your readers to learn that a pair of Sea-Lions have just been added to the collection of animals in the Jardin d'Acclimatation, Paris. They are said to have been brought from the North Pacific, and are marked Otaria stelleri, but I think from their small size ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/012212d0
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  • 7
    Digitale Medien
    Digitale Medien
    Invertibility of quantum-mechanical control systems (1984)
    Springer
    Theory of computing systems 17 (1984), S. 335-350 
    Details
    ISSN: 1433-0490
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Notizen: Abstract This is the first of two papers concerned with the formulation of a continuous-time quantum-mechanical filter. Efforts focus on a quantum system with Hamiltonian of the formH 0+u(t)H 1, whereH 0 is the Hamiltonian of the undisturbed system,H 1 is a system observable which couples to an external classical field, andu(t) represents the time-varying signal impressed by this field. An important problem is to determine when and how the signalu(t) can be extracted from the time-development of the measured value of a suitable system observableC (invertibility problem). There exist certain quasiclassical observables such that the expected value and the measured value can be made to coincide. These are called quantum nondemolition observables. The invertibility problem is posed and solved for such observables. Since the physical quantum-mechanical system must be modelled as aninfinite-dimensional bilinear system, the domain issue for the operatorsH 0,H 1, andC becomes nontrivial. This technical matter is dealt with by invoking the concept of an analytic domain. An additional complication is that the output observableC is in general time-dependent.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01744448
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  • 8
    Digitale Medien
    Digitale Medien
    Quantum nondemolition filters (1985)
    Springer
    Theory of computing systems 18 (1985), S. 33-55 
    Details
    ISSN: 1433-0490
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Notizen: Abstract This is the second of two papers concerned with the formulation of a continuous-time quantum-mechanical filter. In the first paper, the invertibility of a quantum system coupled to a weak time-dependent classical field was studied. The physical system is modelled as an infinite-dimensional bilinear system. Necessary and sufficient conditions for invertibility were derived under the assumption that the output observable is a quantum nondemolition observable (QNDO), characterized by the classical property that its expected value is equal to its measured value. In this paper necessary and sufficient conditions are developed for an observable to qualify as a QNDO; if in addition the criteria for invertibility are met, the given observable defines a quantum nondemolition filter (QNDF). The associated filtering algorithm thus separates cleanly into the choice of output observable (a QNDO) and the choice of procedure for processing the measurement outcomes. This approach has the advantage over previous schemes that no optimization is necessary. Applications to demodulation of optical signals and to the detection and monitoring of gravitational waves are envisioned.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01699460
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  • 9
    Digitale Medien
    Digitale Medien
    Civilisation and Eyesight (1885)
    [s.l.] : Nature Publishing Group
    Nature 31 (1885), S. 433-434 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] IN connection with Lord Rayleigh's letter in NATURE, p. 340, on the above subject, I venture to hope that the following may be of interest:— In the "Expression of the Emotions" the late Mr. Darwin quotes some observations-if I recollect correctly-by Gratiolet tending to show that, under ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/031433d0
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  • 10
    Digitale Medien
    Digitale Medien
    On a Radiant Energy Recorder (1885)
    [s.l.] : Nature Publishing Group
    Nature 32 (1885), S. 343-343 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] A FEW weeks ago I wrote a short article for NATURE under the above title, describing an instrument for the measurement of radiation in heat units which was based upon the principle of the integration of temperature by the distillation of water in vacuo. Since then Mr. Edward Vivian, M.A., has ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/032343b0
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