1,647 research outputs found
Convergence of Scaled Delta Expansion: Anharmonic Oscillator
We prove that the linear delta expansion for energy eigenvalues of the
quantum mechanical anharmonic oscillator converges to the exact answer if the
order dependent trial frequency is chosen to scale with the order as
; as . It
converges also for , if , , where is the coupling constant in front of the operator .
The extreme case with , corresponds to the
choice discussed earlier by Seznec and Zinn-Justin and, more recently, by
Duncan and Jones.Comment: 37 pages (with 11 figures uuencoded at the end of the file,to be
stripped off), GEF-Th-7/199
Improved Convergence Proof of the Delta Expansion and Order Dependent Mappings
We improve and generalize in several accounts the recent rigorous proof of
convergence of delta expansion - order dependent mappings (variational
perturbation expansion) for the energy eigenvalues of anharmonic oscillator.
For the single-well anharmonic oscillator the uniformity of convergence in
is proven. The convergence proof is extended also to complex
values of lying on a wide domain of the Riemann surface of . Via the
scaling relation \`a la Symanzik, this proves the convergence of delta
expansion for the double well in the strong coupling regime (where the standard
perturbation series is non Borel summable), as well as for the complex ``energy
eigenvalues'' in certain metastable potentials. Sufficient conditions for the
convergence of delta expansion are summarized in the form of three theorems,
which should apply to a wide class of quantum mechanical and higher dimensional
field theoretic systems.Comment: some bugs of uuencoded postscript figures are fixe
The Effect of Solvents on the Adduct Formation of Uranyl Thenoyltrifluoroacetonate with Tributyl Phosphate
Addition compound formation between uranyl bis-thenoyltrifluoroacetonate (UO_2A_2) and tributyl phosphate (S) was studied by partition method, using uranium-237 as the tracer. The formula of the adduct complex was shown to be UO_2A_2S. The solvent effect on the adduct formation constant was taken into account in connection with the activity ; the activity coefficients of each species in various solutions were calculated from the molar volume and the solubility parameter. The formation constants based on the molar fraction, K_x, in a number of solvents were preestimated, employing log K_x=7.08 in carbon tetrachloride as a reference. They are in agreement with the observed values. The formation constant in terms of activity was found to be constant log K°_s=5.77±0.30. A correlation between the formation constant of the two adducts, UO_2A_2S and ZnA_2S, was demonstrated
Longitudinal case study of fixed revenue accounting at a Japanese semiconductor distributor / Kenichi Suzuki, Kohsuke Matsuoka and Hiromune Ishii.
Fixed revenue accounting (FRA) is a management control system for relationship marketing strategy. Although FRA has been investigated among some Japanese companies since it was proposed in 2005, there has not been any study examining the effects FRA has on employees' awareness and behaviors based on longitudinal investigation. In this paper, we state a longitudinal case study about FRA at a Japanese semiconductor distributor during 2006–2014. We found that at Company A, only senior management used FRA to understand its strategy until 2012. After they became convinced FRA could guide relationship marketing, they started using FRA as a management control system in 2013 by binding it with its strategic plan and annual budgets. We interviewed with twelve core employees in 2014 and clarified that FRA motivated employees to accept relationship marketing strategy, deepened common understanding between departments, and facilitated an understanding of how to achieve goals
Spontaneous strain due to ferroquadrupolar ordering in UCuSn
The ternary uranium compound UCuSn with a hexagonal ZrPtAl-type
structure shows a phase transition at 16 K. We reported previously that huge
lattice-softening is accompanied by the phase transition, which originates from
ferroquadrupolar ordering of the ground state non-Kramers doublet . A
macroscopic strain, which is expected to emerge spontaneously, was not detected
by powder X-ray diffraction in the temperature range between 4.2 and 300 K. To
search the spontaneous strain, we have carried out thermal expansion
measurements on a single-crystalline sample along the , and axes
using a capacitance technique with the resolution of . In the present
experiment, we found the spontaneous strain which couples to
the ground state doublet . The effect of uniaxial pressure along the
, and axes on the transition temperature is also discussed.Comment: 4 pages, 5 figures, submitted to Phys. Rev.
Activities of bone morphogenetic proteins in prolactin regulation by somatostatin analogs in rat pituitary GH3 cells
Involvement of the pituitary BMP system in the modulation of prolactin (PRL) secretion regulated by somatostatin analogs, including octreotide (OCT) and pasireotide (SOM230), and a dopamine agonist, bromocriptine (BRC), was examined in GH3 cells. GH3 cells are rat pituitary somato-lactotrope tumor cells that express somatostatin receptors (SSTRs) and BMP system molecules including BMP-4 and -6. Treatment with BMP-4 and -6 increased PRL and cAMP secretion by GH3 cells. The BMP-4 effects were neutralized by adding a BMP-binding protein Noggin. These findings suggest the activity of endogenous BMPs in augmenting PRL secretion by GH3 cells. BRC and SOM230 reduced PRL secretion, but OCT failed to reduce the PRL level. In GH3 cells activated by forskolin, BRC suppressed forskolin-induced PRL secretion with reduction in cAMP levels. OCT did not affect forskolin-induced PRL level, while SOM230 reduced PRL secretion and PRL mRNA expression induced by forskolin. BMP-4 treatment enhanced the reducing effect of SOM230 on forskolin-induced PRL level while BMP-4 did not affect the effects of OCT or BRC. Noggin treatment had no significant effect on the BRC actions reducing PRL levels by GH3 cells. However, in the presence of Noggin, OCT elicited an inhibitory effect on forskolin-induced PRL secretion and PRL mRNA expression, whereas the SOM230 effect on PRL reduction was in turn impaired. It was further found that BMP-4 and -6 suppressed SSTR-2 but increased SSTR-5 mRNA expression of GH3 cells. These findings indicate that Noggin rescues SSTR-2 but downregulates SSTR-5 by neutralizing endogenous BMP actions, leading to an increase in OCT sensitivity and a decrease in SOM230 sensitivity of GH3 cells. In addition, BMP signaling was facilitated in GH3 cells treated with forskolin. Collectively, these findings suggest that BMPs elicit differential actions in the regulation of PRL release dependent on cellular cAMP-PKA activity. BMPs may play a key role in the modulation of SSTR sensitivity of somato-lactotrope cells in an autocrine/paracrine manner
- …