Static dielectric response of icosahedral fullerenes from C60 to C2160 by an all electron density functional theory

The static dielectric response of C60, C180, C240, C540, C720, C960, C1500, and C2160 fullerenes is characterized by an all-electron density-functional method. First, the screened polarizabilities of C60, C180, C240, and C540, are determined by the finite-field method using Gaussian basis set containing 35 basis functions per atom. In the second set of calculations, the unscreened polarizabilities are calculated for fullerenes C60 through C2160 from the self-consistent Kohn-Sham orbitals and eigen-values using the sum-over-states method. The approximate screened polarizabilities, obtained by applying a correction determined within linear response theory show excellent agreement with the finite-field polarizabilities. The static dipole polarizability per atom in C2160 is (4 Angstrom^3) three times larger than that in C60 (1.344 Angstrom^3). Our results reduce the uncertainty in various theoretical models used previously to describe the dielectric response of fullerenes and show that quantum size effects in polarizability are significantly smaller than previously thought.Comment: RevTex, 3 figure

Challenges in Demonstrating the Impact of Overconfidence in M&A Activity

Financial Economics,

Vibrational signatures for low-energy intermediate-sized Si clusters

We report low-energy locally stable structures for the clusters Si20 and Si21. The structures were obtained by performing geometry optimizations within the local density approximation. Our calculated binding energies for these clusters are larger than any previously reported for this size regime. To aid in the experimental identification of the structures, we have computed the full vibrational spectra of the clusters, along with the Raman and IR activities of the various modes using a recently developed first-principles technique. These represent, to our knowledge, the first calculations of Raman and IR spectra for Si clusters of this size

The Hamiltonian of the V15_{15} Spin System from first-principles Density-Functional Calculations

We report first-principles all-electron density-functional based studies of the electronic structure, magnetic ordering and anisotropy for the V$_{15}$ molecular magnet. From these calculations, we determine a Heisenberg Hamiltonian with four antiferromagnetic and one {\em ferromagnetic} coupling. We perform direct diagonalization to determine the temperature dependence of the susceptibility. This Hamiltonian reproduces the experimentally observed spin $S$=1/2 ground state and low-lying $S$=3/2 excited state. A small anisotropy term is necessary to account for the temperature independent part of the magnetization curve.Comment: 4 pages in RevTeX format + 2 ps-figures, accepted by PRL Feb. 2001 (previous version was an older version of the paper

Delinquency Predictors: Offending to Commitment

The United States processes millions of adolescents through the juvenile court system annually. Throughout these hearings and upon adjudication, it is ultimately up to a judge to decide the juvenile’s disposition. Although research on juvenile delinquency has identified a variety of factors linked to youth offending, research is limited in terms of variables predicting a juvenile’s dispositional outcome. The current study examined number of predictive variables for youth offending to determine if they also influence a juvenile being committed to state custody in Idaho. This analysis consists of pre-screen evaluations obtained by the Idaho Department of Juvenile Corrections. The factors acquired from these reports are evaluated in terms of their effect on adolescent disposition. Findings partially support the hypothesis, revealing three statistically significant predictive factors of juvenile state commitment

The Danish large wind turbine program

A brief description of the Danish wind energy program and its present status is given. Results and experiences from tests on the Gedser windmill (200 kW) are presented. The key results are presented from the preliminary design study and detailed design of two new WECS (630 kW each) is described

Finland in the Anglo-American Press, 1939-1955: A Special Case?

The West\u27s image of Finland and its policy towards Finland during World War II and the Cold War has been thought to be an exception to the framework of power politics and diplomacy. This thesis will seek to determine the validity of this assumption in the United States and Great Britain by examining the popular press of each country. This thesis will also explore what differences if any existed between the Anglo and American press. This thesis will attempt to understand the analysis, judgments, and opinions of the Anglo and American press regrading Finland and their impressions as to what the appropriate responses of Great Britain and the United States should be towards Finland. This thesis discusses how accurate their observations and assessments were and within that context determines whether or not Finland can be considered a special case. The Winter War between Finland and the Soviet Union was widely covered in the Anglo and American press. The foremost common theme was an almost universal sympathy and admiration for the Finns. The press response to Finland was due partly, but not exclusively, to its sentiment toward the Soviet Union. The Winter War created the image of Valiant Finland, wdth the press portraying Finland as a defender of Western Civilization, particularly democracy and Christianity. The Winter War and the press coverage of it created a substantial reservoir of goodwill for Finland. This combined with Finland\u27s already positive image as an honest debt paying nation. During the Continuation War Finland fought as a co-belligerent of Nazi Germany against the Soviet Union, but only to regain the territory it lost in the Winter War. Finland was trapped in a tricky geopolitical and diplomatic situation. As the war continued the Anglo and American press became more and more critical of Finland\u27s role, but distinguished between the actions of the Finnish government and the Finnish people. After World War II the Anglo and American press paid little attention to daily life in Finland. The events that brought attention to Finland were often events in which Finland appeared to be exceptional when compared to other nations thought to be in similar circumstances. Finland\u27s image evolved through the years. The Anglo and American press recognized Finland as a functioning democracy, but they did not altogether regard Finland as neutral. The press stressed the image of Honest Finland as the Finns completed their reparation payments to the Soviet Union in 1952. The press described Finland as a democratic nation that shared Western values but that circumstances did not allow it to exercise a pro-West foreign policy. Although the United States and Great Britain were allies in World War II and the Cold War, some differences occurred in their respective coverage of Finland, as their national interests diverged. Given the geopolitical reality that placed Finland in political alignments that did not support British and American interests, the Anglo and American press coverage of Finland revealed an unmistakable reservoir of goodwill and sympathy for the Finnish people. The Anglo and American press coverage of Finland between 1939 and 1955 was indeed an exception to the conventional framework of power politics and diplomacy. Finland was a special case