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  • 1
    Electronic Resource
    Electronic Resource
    Metallacarboranes of the C2B4-cage systems (1993)
    Springer
    Journal of cluster science 4 (1993), S. 297-349 
    Details
    ISSN: 1572-8862
    Keywords: Metallacarborane ; main-group, early and later transition, and lanthanide metals ; linked cages and multidecker sandwiches ; mono-, di-, tri-, and tetra-carbon carborane, and arene ligands ; donor-acceptor complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A comprehensive review of the chemistry of polyhedral cluster complexes in whichs,p,d, andf-block metals are incorporated into C2B4-carborane cages to form the respective metallacarboranes is presented. The main focus of the review is directed toward systematizing the chemistry of metallacarboranes in order to promote their use as possible electronic, ceramic, and/or catalytic materials in addition to providing information on which we can test and expand our knowledge about the fundamental interactions that are at work in determining the structures and properties of these cluster complexes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00703731
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  • 2
    Electronic Resource
    Electronic Resource
    Marx on ideology, power and force (1976)
    Springer
    Theory and decision 7 (1976), S. 315-329 
    Details
    ISSN: 1573-7187
    Source: Springer Online Journal Archives 1860-2000
    Topics: Sociology , Economics
    Notes: Abstract As Marx matured as a thinker, he became more acutely aware of the obstinate hold which capitalism exercised upon society. Consequently, he was forced to complement his theory of revolution with a theory of social structures. In this paper, I aim to explore Marx's ideas on this point as they emerge in three of his more mature works, i.e.,Capital, Grundrisse, and theTheories of Surplus Value. My enterprise is guided by my convictions that (i) the notions of ideology, power and force are still central to debates in modern social theory, and (ii) Marx's development of these notions has the intrinsic merit of providing a useful and sophisticated contribution to such debates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00135084
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  • 3
    Electronic Resource
    Electronic Resource
    Structural and bonding investigation of an unbridged donor-acceptor complex 1-(2,2′-bipyrimidine)-1-(t-butyl)-2, 3-bis(trimethylsilyl) -2,3-dicarba-1-galla-closo-heptaborane(6) (1992)
    Springer
    Structural chemistry 3 (1992), S. 183-190 
    Details
    ISSN: 1572-9001
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The reaction between thecloso-gallacarborane, 1-(t-C4H9)-1-Ga-2,3-(SiMe3)2-2,3-C2B4H4 (1), and 2,2′-bipyrimidine in a molar ratio of 1∶1 in dry benzene produced the unbridged donor-acceptor complex 1-(2,2′-C8H6N4)-1-(t-C4H9)-1-Ga-2,3-(SiMe3)2-2, 3-C2B4H4 (2) as a pale-yellow crystalline solid in 81% yield. The spectroscopic data of2 are almost identical to those of the bridged species 1,1′-(2,2′-C8 H6N4)-[1-(t-C4H9)-1-Ga-2,3-(SiMe3)2-2,3-C2 B4H4]2 (3). However, the single-crystal X-ray structure of2 reveals that the complex consists of only one distorted gallacarborane unit and a bipyrimidine molecule, that acts as a bidentate ligand. The apical gallium in2 is displaced further away from the centroidal position above the carborane than it is in 1. Despite the steric hindrance imposed by the bulky trimethylsilyl groups on the cage carbons, the Ga-C(t-buty) bond is tilted toward the cage carbon atoms. Complex2 crystallizes in the monoclinic space groupP21 witha=11.279 (3),b=10.060 (3),c=11.911 (3) Å,β=94.94 (2)°,V=1346.5 (6) Å3,Z=2,D x=1.24g cm−3, λ(MoKα) F(000)= 528, andT=220 K. Full-matrix least-squares refinement for2 converged at R=0.036 andRw= 0.045 for 3032 observed reflections. Molecular orbital calculations showed that antibonding interactions between the gallium and carborane cage carbons, induced by base complexation, are a contributing factor to the gallium's slip distortion that is found in2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00678415
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  • 4
    Electronic Resource
    Electronic Resource
    Structural and bonding investigation of the donor—acceptor complex 1-Sn(phenanthroline)-2, 3-[Si(CH3)]3]2-2,3-C2B4H4: A comparative study of the group 14 metallacarborane-Lewis base complexes (1990)
    Springer
    Structural chemistry 1 (1990), S. 583-595 
    Details
    ISSN: 1572-9001
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Closo-1-Sn-2,3-[Si(CH3)3]2-2,3-C2B4H4 (1) reacts with 1,10-phenanthroline to form the complex 1-(C12H8N2)Sn-2, 3-[Si(CH3)3]2-2,3-C2B4H4. When crystals of this complex were grown slowly from benzene, a crystalline modification (2) was obtained in which the unit cell consisted of four identical molecules of the base-stannacarborane and six benzene molecules of solvation. When the complex was sublimed, a second crystalline modification (3) was obtained whose unit cell consisted of two crystaliographically different molecules (3-1 and3-2). In all three forms the tin was not symmetrically bonded to the carborane but was slipped toward the boron side of the C2B3 face, and the phenanthroline molecules were oriented opposite to the cage carbons so that the plane of the base and the carborane faces gave acute dihedral angles. However, the three forms showed a great deal of variation in the extent of slippage and the magnitudes of the base-carborane dihedral angles. Since these distortions are common structural features of base-group 14-carborane and cyclopentadienyl systems, MNDO-SCF molecular orbital calculations were carried out on the model compounds 1-(C12H8N2)Sn-2,3-C2B4H6, 1-[C10H8N2)Sn-2, 3-C2B9H11, and [(C10H8N2)-SnC5(CH3)5]+ to determine what factors dictate the structures of these complexes. The results showed that competing bonding interactions give rise to a very broad minimum in energy as a function of slippage and base orientation. Small energy variations, such as those produced by crystal packing forces, could produce large structural changes. Complex2 crystallizes in the monoclinic space group P21/n witha=11.096 (9) Å,b=26.51(2) Å,c=11.729 (7) Å,β=107.43 (6) ∘,U=3291 (4) Å3, andZ=4. Full-matrix least-squares analysis converged atR=0.044 andR w=0.055. Complex3 crystallizes in the triclinic space group P¯1 witha=10.251 (3) Å,b= 13.845(9) Å;c=19.168 (9) Å,α=71.12 (5) ∘,β=89.29 (3) ∘,γ=84.62 (4) ∘,U=2562 (2) Å3, andZ=4. The structure refined atR=0.079 andR w=0.125.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00674134
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  • 5
    Electronic Resource
    Electronic Resource
    Coordinating market and evaluation research on the Admissions rating process (1981)
    Springer
    Research in higher education 14 (1981), S. 71-85 
    Details
    ISSN: 1573-188X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Nature of Science, Research, Systems of Higher Education, Museum Science
    Notes: Abstract A research program is suggested that integrates Admissions procedures and methods of statistical analysis to study the first stage of the Admissions selection process: the rating of applicants. To form the base for evaluation research, a systematic procedure is described that provides an index of applicant “quality” in the light of institutional goals. Then the rating process itself is explored using a Path Model to measure the contributions of background and achieved characteristics of applicants to their rating. How questions of bias may be raised and pursued is discussed. Applicants are profiled in segments to show how the effects of policy adjustments may be monitored. For doing marketing research, quality-by-enrollment status segments are defined. Using factor analysis models, an analysis of image variance is applied. Next, a discriminant analysis is used to isolate those institutional attributes that most influence higher quality applicants to enroll. Some specifics of a differentiated policy are given in examples. Implications of this integrated approach are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00995371
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  • 6
    Electronic Resource
    Electronic Resource
    Identifying distinctive groups in a college applicant pool (1982)
    Springer
    Research in higher education 16 (1982), S. 195-208 
    Details
    ISSN: 1573-188X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Nature of Science, Research, Systems of Higher Education, Museum Science
    Notes: Abstract In a time when most post-secondary educational institutions must distribute limited resources more efficiently, segmentation analysis affords a way to direct planning to yield strategic benefits. The Automatic Interaction Detector is recommended to the institutional research community as an analytical tool for effectively identifying distinctive subgroups within an educational market. In this application, AID is used to segment the Boston College applicant pool according to subgroups' relative probabilities of enrolling. The findings illustrate that AID can make a useful contribution to market research and that the technique has broader applicability—to other student groups and to other educational policy questions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00973583
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  • 7
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    Optimized hydrogen positions for aluminium and iron containing hydroxide minerals (2007)
    Springer
    Details
    Publication Date: 2007-02-06
    Print ISSN: 0022-2461
    Electronic ISSN: 1573-4803
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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