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  • 1
    Electronic Resource
    Electronic Resource
    Crystallized ion beams in a storage ring (1996)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 18 (1996), S. 449-457 
    Details
    ISSN: 0392-6737
    Keywords: Nonneutral plasmas ; Storage rings ; Plasma simulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Crystallization for an ion beam in a storage ring was theoretically studied. Properties of ordered state of ion beams are discussed under smooth approximation. In particle simulations, performed in a realistic lattice, high-density three-dimension crystalline structures were achieved. In all cases the crystal had no shear slippage and only particle oscillations with the lattice periodicity took place. A linear dependence of longitudinal velocity on horizontal position, foreseen by the theory for ground states in a smooth lattice, was observed in all cases. This is a step forward in the understanding of crystalline ground states: the particles spontaneously organize themselves so to have the same angular velocity and to maintain their reciprocal position as in usual matter crystals. Theoretical considerations on shear and breathing are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02451807
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  • 2
    Electronic Resource
    Electronic Resource
    Comparative analysis of the load-carrying capacity of sections of metal structures using an automated system of calculating strength and cracking resistance (1994)
    Springer
    Strength of materials 26 (1994), S. 311-314 
    Details
    ISSN: 1573-9325
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The authors examined the possibilities of using an automated system of calculated strength and cracking resistance in comparative analysis of the load-carrying capacity of sections of metal structures. Such a system, which also includes as a compound part a program for finite-element calculations, is fitted with additional functions to produced models of new variants of design and compare the results of several calculations. The optimum variant of the structure is selected from a set of information presented in the graphical and/or digital form. The values of nominal stresses in main loading-carrying elements of components, the characteristics reflecting the stiffness of the structure (or its sections), and the coefficient of exhaustion of the load-carrying capacity are used. The latter parameter is a universal characteristic calculated from different criteria of the fracture mechanics and conventional strength theories. Examples are presented of comparative analysis of the load-carrying capacity of a beam of a bridge crane for which three-dimensional finite element models are constructed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02207412
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  • 3
    Electronic Resource
    Electronic Resource
    Sinking shafts in thixotropic jackets by the method of forced embedment (1976)
    Springer
    Soil mechanics and foundation engineering 13 (1976), S. 289-291 
    Details
    ISSN: 1573-9279
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01705823
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  • 4
    Electronic Resource
    Electronic Resource
    Motion of two pulsating spheres in an ideal incompressible fluid (1983)
    Springer
    Fluid dynamics 18 (1983), S. 472-475 
    Details
    ISSN: 1573-8507
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The problem of the interaction of two pulsating spheres in an ideal incompressible fluid was first investigated in detail by Bjerknes [1]. However, his and subsequent studies on this subject [2–5] were restricted to the interaction forces between the spheres, whereas the law of their motion was not considered because of the much greater complexity of the corresponding problem. The aim of the present paper is to find an approximate analytic solution to the problem of the motion of two pulsating spheres in an ideal incompressible fluid filling the entire space exterior to the spheres under the assumption that the flow of the fluid is irrotational.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01090574
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  • 5
    Electronic Resource
    Electronic Resource
    Spectroscopic study of organosilicon derivatives of thiophene (1972)
    Springer
    Chemistry of heterocyclic compounds 8 (1972), S. 827-831 
    Details
    ISSN: 1573-8353
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract It is shown that the chemical shifts of hydrogen atoms in the 3 position of the thiophene ring in the PMR spectra of 2-substituted thiophenes are linearly associated with the Hammett σ n substituent constants. On the basis of this, it was concluded that silyl substituents in 2-silylthiophenes have electron-acceptor character. It was established that the degree of dΠ–pΠ conjugation between the d orbitals of the silicon atom and the p electrons of the thiophene ring depends on the nature of the other three substituents attached to the silicon atom. The data from the IR spectra of organosilylthiophenes that contain a Si-H bond also attest to the presence of dΠ–pΠ conjugation in these compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00475212
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  • 6
    Electronic Resource
    Electronic Resource
    A new method of synthesizing mesoionic 1,2,4-triazole-3-thiones and their spectra (1973)
    Springer
    Chemistry of heterocyclic compounds 9 (1973), S. 1048-1054 
    Details
    ISSN: 1573-8353
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Mesoionic 1,2,4-triazole-3-thiones have been synthesized by the reaction of 1-acyl-1-arylhydrazines and 1-acyl-1-alkylhydrazines with isothiocyanates in the presence of triethylamine. The structure of the compounds obtained has been confirmed by a study of their UV, IR, PMR, and mass spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00471729
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  • 7
    Electronic Resource
    Electronic Resource
    Spectroscopic study of organosilicon derivatives of thiophene (1972)
    Springer
    Chemistry of heterocyclic compounds 8 (1972), S. 1338-1342 
    Details
    ISSN: 1573-8353
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Substituents in disubstituted thiophenes have an additive effect on the chemical shifts of the ring hydrogen atoms. The electronic effects of organosilicon substituents are transmitted via inductive and conjugation (dπ-pπ interaction) mechanisms. The effect of dπ-pπ interaction in the Si-ring bond is absent for Si(OC2H5) and SiF3 substituents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00471866
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  • 8
    Electronic Resource
    Electronic Resource
    Proton magnetic resonance spectra of certain alkenyl derivatives of germanium (1969)
    Springer
    Russian chemical bulletin 18 (1969), S. 44-48 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Conclusions 1. The PMR spectra of eight compounds R3GeCH=CH2, where R=CH3, Br, Cl; (C2H5)2Ge(CH= CH2)2, and R3GeCH2CH=CH2, where R=CH3, C2H5, Br, Cl, were obtained. 2. For the compound R3MCH= CH2, where R= CH3, Cl, while M= Si or Ge, the contributions of the magnetic anisotropy and the electric field of the substituents to the chemical shifts of the vinyl protons were calculated, which permitted an isolation of the effect of dπ−pπ interaction, which is more substantial in vinylsilanes. 3. The chemical shifts of the protons of allyl groups and substituents were analyzed from the standpoint of the inductive effect and dπ−pπ ininteraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00907592
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  • 9
    Electronic Resource
    Electronic Resource
    Proton magnetic resonance spectra of disilyl- and digermyl-substituted ethylenes (1969)
    Springer
    Russian chemical bulletin 18 (1969), S. 959-963 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Conclusions 1. The PMR spectra of a number of disilyl- and digermyl-substituted ethylenes, as well asβ-chlorovinyl derivatives of silicon and germanium, were obtained. These compounds have a trans-configuration. 2. The chemical shifts of the -CH=CH- fragment, corrected for the effects of magnetic anisotropy and the electrical field of the substituents, are evidence of greater ability of silicon for dπ-pπ interaction with the π-electrons of the double bond in comparison with germanium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00922849
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  • 10
    Electronic Resource
    Electronic Resource
    Proton magnetic resonance spectra of organic compounds with silicon and germanium and the relative ability of substituents for dπ - pπ interaction (1970)
    Springer
    Russian chemical bulletin 19 (1970), S. 1210-1215 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Conclusions 1. An analysis of the chemical shifts in the proton magnetic resonance (PMR) spectra of (CH3)3MX (M=Si, Ge; X=F, OCH3, Br, C6H5), (CH3)4−nMCln, (C2H5)4−nMCln, and (C2H5)3MBr, corrected for the effects of magnetic anisotropy and the electric field of the substituent X, showed that the ability of X for dπ−pπ interaction with the atom M decreases in the series: F〉OCH3〉Cl〉C6H5〉 Br. Silicon possesses greater ability for dπ−pπ interaction than germanium. 2. On the basis of a comparison of the results obtained with data on the IR spectra of silicon hydride, a hypothesis was advanced on the influence of hyperconjugation on the IR and PMR spectra of silanes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00852661
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