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141.
142.
F. Stetter 《Monatshefte für Mathematik》1968,72(3):239-244
Ohne ZusammenfassungWork performed in part under the auspices of the U. S. Atomic Energy Commission. 相似文献
143.
INTRODUCTION In this third part of a review on chemometrics in spectroscopy we will describe a recent methodology that has attracted increasing interest in spectroscopy. namely multi-way analysis. The application of multi-way analysis in spectroscopy is still relatively new. hence many methodological improvements are being investigated currently. Part of thls review will also be used to describe the algorithmic improvements gained the last decade. 相似文献
144.
MINHHUY HÔ VEDENE H. SMITH JR. ROBIN P. SAGAR RODOLFO O. ESQIVEL 《Molecular physics》2013,111(20):1727-1728
The asymptotic behaviour of the negative ratio of the density gradient to the electron density, q(r), for neutral and singly charged atoms has been investigated. The results show that, for large r, q(r) can approach its limit √8?, where ? is the first ionization potential, from either above or below depending on the specific system considered. 相似文献
145.
JR Henderson 《Molecular physics》2013,111(17-18):2345-2352
The confinement of fluids in pores and wedges is associated with exponentially damped oscillatory packing structure, as observed with the surface forces apparatus. This paper reviews the statistical mechanics of confined fluids and then illustrates the results with density functional data for hard-sphere solvent. The free energy of the pore fluid and its functional derivatives with respect to thermodynamic fields all oscillate, as a function of pore width, with a wavelength close to the solvent diameter. In contrast, the density at the centre of pores oscillates with twice this wavelength, as a function of pore width. The development of a unified physics of confined fluids is considered. Approximations based on one-dimensional physics do extraordinarily well in planar symmetry at three-dimensions. 相似文献
146.
The time and magnetic field dependent magnetization of polarized signals in the presence of chemically induced magnetization transfer is described by means of a kinetic matrix incorporated into the Bloch equations. The approach is transformed into a computer algorithm accounting for all hyperfine lines present in the system. Solutions are readily obtained by numerical methods. Calculations are applied to the time resolved EPR (TR-EPR) spectroscopic signals of p-benzoquinone after laser flash photolysis. In an aqueous alcoholic solution at pH 2.0, chemical exchange via intermolecular proton transfer is found present between neutral semiquinones. At pH 8.3, the TR-EPR spectrum shows only a uniform signal of the semiquinone. At pH 5.4, a superposition of neutral and anionic radicals is observed together with a protonation-deprotonation equilibrium. A two-step hydrogen atom transfer, consisting of electron transfer followed by protonation, is proposed to account for the formation of both neutral and anionic semiquinone species prior to observation. Experiments in partly deuterated solvent mixtures indicate the existence of three semiquinone forms: BQH?, BQ?-, and BQD? prior to observation. The origin of the proton/deuteron transferred to the anion radical in the precursor state is discussed. 相似文献
147.
William N. Anderson JR. E. James Harner George E. Trapp 《Linear and Multilinear Algebra》2013,61(3-4):295-299
There is an isomorphism between the matrices over the Boolean algebra of subsets of a k-element set and the k-tuples of Boolean binary (i.e. zero-one) matrices. This isomorphism allows many problems concerning nonbinary Boolean matrices to the referred to the binary ease. However, there are some features of the general (i.e. nonbinary) case that have not been mentioned, although they differ somewhat from the binary case. We exhibit characterizations of the linear operators that preserve several invariants of matrices over finite Boolean algebras to illustrate the differences and similarities of the general vs. the binary cases. We employ a canonical form that is useful in applying the isomorphism. 相似文献
148.
149.
A. Stetter 《Fresenius' Journal of Analytical Chemistry》1961,182(2):131
Ohne Zusammenfassung 相似文献
150.
A. Stetter 《Fresenius' Journal of Analytical Chemistry》1961,182(2):143
Ohne Zusammenfassung 相似文献