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11.
In [7] Furstenberg gave a proof of Borel’s density theorem [1], which depended not on complete reducibility but rather on
properties of the action of a minimally almost periodic group on projective space. In [9] and [10] the basic idea of this
proof was extended in various ways to deal with other particular classes of Lie groupsG and closed subgroupsH of cofinite volume. In [5] Dani gives a more general form of the density theorem in whichH need only be non-wandering. In the present paper we define the condition ofk-minimal quasiboundedness, and prove that this condition is necessary and sufficient for the density theorem to hold ((2.4)
and (2.6)). Here we replace the arguments of [9] and [10] simply by proofs that the groups considered there satisfy this condition
(2.10). We extend the results of [9] and [10] by considering groups which are analytic rather than algebraic, and in the solvable
case we completely characterize thek-minimally quasibounded groups (2.9). In the last section we give two applications of the density theorem. 相似文献
12.
Jules W. Moskowitz Sid Topiol Lawrence C. Snyder Mark A. Ratner 《International journal of quantum chemistry》1981,19(1):131-137
A compact and efficient scaled single-zeta basis set has been developed for use in conjunction with the coreless Hartree–Fock silicon effective potential. The scale factors were determined by minimizing the electronic energy of the disilane molecule. Based upon a generalized valence bond computation using this basis, we conclude that the classical concept of localized σ bonds is adequate to fully explain the electronic structure of disilane in analogy to the ethane molecule. 相似文献
13.
14.
15.
Joëlle Mayrargue Serge Labidalle Jean Randriatsoa Henri Moskowitz Marcel Miocque 《Journal of heterocyclic chemistry》1984,21(6):1765-1768
Propargylpyridiniums 2-substituted by hydroxylamine or hydrazine moieties cyclize by heating to imidazopyridiniums whereas derivatives substituted by methylhydrazine or N,N' -dimethylhydrazine lead to pyridino-as-triaziniums. These differences are discussed. 相似文献
16.
Xu M Elmatad YS Sebastianelli F Moskowitz JW Bacić Z 《The journal of physical chemistry. B》2006,110(49):24806-24811
We report quantum five-dimensional (5D) calculations of the energy levels and wave functions of the hydrogen molecule, para-H2 and ortho-H2, confined inside the small dodecahedral (H2O)20 cage of the sII clathrate hydrate. All three translational and the two rotational degrees of freedom of H2 are included explicitly, as fully coupled, while the cage is treated as rigid. The 5D potential energy surface (PES) of the H2-cage system is pairwise additive, based on the high-quality ab initio 5D (rigid monomer) PES for the H2-H2O complex. The bound state calculations involve no dynamical approximations and provide an accurate picture of the quantum 5D translation-rotation dynamics of H2 inside the cage. The energy levels are assigned with translational (Cartesian) and rotational quantum numbers, based on calculated root-mean-square displacements and probability density plots. The translational modes exhibit negative anharmonicity. It is found that j is a good rotational quantum number, while the threefold degeneracy of the j = 1 level is lifted completely. There is considerable translation-rotation coupling, particularly for excited translational states. 相似文献
17.
Xinwei Wu Jeremy D. Moskowitz John C. Mauro Marcel Potuzak Qiuju Zheng Rüdiger Dieckmann 《Journal of Non》2012,358(12-13):1430-1437
Sodium tracer diffusion coefficients, D*Na, have been measured using the radioactive isotope Na-22 in sodium boroaluminosilicate (NBAS) glasses containing either a small amount of As2O3 or Fe2O3. The chemical compositions of the first type of glasses are given by the formula [(Na2O)0.71(Fe2O3)0.05(B2O3)0.24]0.2[(SiO2)x(Al2O3)1 ? x]0.8 and those of the second type of glasses correspond to the formula [(Na2O)0.73(B2O3)0.24(As2O3)0.03]0.18[(SiO2)x(Al2O3)1 ? x]0.82. Tracer diffusion measurements were performed at different temperatures between 198 and 350 °C. Pre-annealing of the glass samples at their glass transition temperatures in common air was found to lead to changes in the values of sodium tracer diffusion coefficients. For the NBAS glasses containing Fe2O3, after pre-annealing for 5 h, the activation enthalpy derived for the sodium tracer diffusion increases almost linearly from 57.5 to 71.3 kJ/mol with a decrease in the alumina content while the pre-exponential factor of the sodium tracer diffusion coefficient increases from 2.1 · 10? 4 to 5.3 · 10? 4 cm2/s. For the iron-free NBAS glasses pre-annealed for 5 h, the activation enthalpy varies between 63.9 and 71.4 kJ/mol while the pre-exponential factor varies between 1.5 · 10? 4 and 1.2 · 10? 3 cm2/s. In addition, it was observed that the considered glasses take up water when annealed at 300 °C in wet air with PH2O = 474 mbar. 相似文献
18.
A Lie group is called exponential if its exponential map is surjective. It is called weakly exponential if the exponential
image is dense, which is equivalent to the connectivity of each of the Cartan subgroups (compare [11]). In the present paper
the authors study exponential Lie groups which are of mixed type, i.e., neither solvable nor semisimple. Necessary conditions
and also, for special mixed Lie groups, sufficient conditions are given for exponentiality. Several counter examples are provided
showing that none of the conditions which have surfaced during the course of our investigation can work as necessary and sufficient ones. All conditions considered deal with centralizers of ad-nilpotent elements of the Lie algebra. For example,
it is shown that if G is exponential, there is a rather large characteristic subgroup B which contains the nilradical, all Levi factors, and all maximal compactly embedded subgroups, which is also exponential.
Moreover, this subgroup is also Mal’cev splittable so that one can apply earlier results on Mal’cev splittable exponential
Lie groups, which characterize exponentiality of these Lie groups (also by conditions concerning the centralizers of ad-nilpotent
elements).
(Received 1 June 1999; in final form 28 December 1999) 相似文献
19.
Abbott T Akiba Y Beavis D Bloomer MA Bond PD Chasman C Chen Z Chu YY Cole BA Costales JB Crawford HJ Cumming JB Debbe R Engelage J Fung SY Grodzins L Gushue S Hamagaki H Hansen O Hayano RS Hayashi S Homma S Huang HZ Ikeda Y Juricic I Kang J Katcoff S Kaufman S Kimura K Kitamura K Kurita K Ledoux RJ Levine MJ Miake Y Morse RJ Moskowitz B Nagamiya S Olness J Parsons CG Remsberg LP Sakurai H Sarabura M Shor A Stankus P Steadman SG Stephans GS Sugitate T Tanaka M Tannenbaum MJ Torikoshi M 《Physical review letters》1991,66(12):1567-1570
20.
Albrecht R Antonenko V Awes TC Barlag C Berger F Bloomer M Blume C Bock D Bock R Bohne E Bucher D Claesson G Claussen A Clewing G Debbe R Dragon L Dubovik Y Eklund A Fokin S Franz A Garpman S Glasow R Gustafsson HÅ Gutbrod HH Hansen O Hölker G Idh J Ippolitov M Jacobs P Kampert KH Karadjev K Kolb BW Lebedev A Löhner H Lund I Manko V Moskowitz B Nikolaev S Nystrand J Obenshain FE Oskarsson A Otterlund I Peitzmann T Plasil F Poskanzer AM Purschke M Ritter H Roters B Saini S Santo R Schlagheck H 《Physical review letters》1996,76(19):3506-3509