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1.
Jean-Pierre Dedieu Gregorio Malajovich Mike Shub 《Foundations of Computational Mathematics》2005,5(2):145-171
We prove a linear bound on the average total curvature of the
central path of linear programming theory in terms of the number
of independent variables of the primal problem, and independent of
the number of constraints. 相似文献
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4.
A. K. Gatin M. V. Grishin N. V. Dokhlikova N. N. Kolchenko B. R. Shub 《Doklady Physical Chemistry》2016,470(1):125-128
It has been demonstrated that hydrogen adsorption has an effect on the electronic structure of gold nanoparticles. The physicochemical properties of separate gold nanoparticles have been studied under an ultrahigh vacuum scanning tunneling microscope. The structure and electronic structure of gold–hydrogen clusters were modeled by the quantum-chemical density functional theory method. Hydrogen adsorption onto gold nanoparticles 4–5 nm is size at room temperature was experimentally revealed, and the lower limit of 1.7 eV for the Au–H bond energy was determined. The interaction of hydrogen with gold leads to a considerable rearrangement of the electronic subsystem of nanoparticles. The experimentally observed effects were supported by quantum-chemical calculations. The rearrangement mechanism is related to strong correlations in the electronic subsystem. 相似文献
5.
A. K. Gatin M. V. Grishin B. R. Shub 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2012,6(5):730-732
Molecular nitrogen adsorption on single platinum and titanium nanoclusters is investigated by scanning tunneling microscopy and spectroscopy, including the use of an inverse scheme of spectroscopic measurements. Some regularities of the occurring processes are found. 相似文献
6.
The possibility of detection of the electron spin of a single paramagnetic species (an atom, a radical, or an ion) on the
surface was discussed. The analysis was based on spin chemistry laws taking into account the statistics of the spin states
of both the tunneling electron and paramagnetic center. The equations for the tunneling current as a function of temperature
and magnetic field strength were derived.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1732–1734, September, 1998. 相似文献
7.
M. V. Grishin A. K. Gatin V. G. Slutskii V. A. Kharitonov S. A. Tsyganov B. R. Shub 《Russian Journal of Physical Chemistry B, Focus on Physics》2016,10(5):760-763
It was shown that the rate of ammonia decomposition on a platinum nanocoating can be controlled by applying an external electrostatic field to the coating to create a negative or positive platinum potential of variable magnitude. In experiments conducted with a contact time of 15 min between platinum and ammonia at a temperature of 700 K and a pressure of 5 × 10–7 Torr, the decomposition rate increased by 44% at a negative potential of the coating of–6 V and by 70% at a positive potential of +6 V. 相似文献
8.
Adler Roy L.; Dedieu Jean-Pierre; Margulies Joseph Y.; Martens Marco; Shub Mike 《IMA Journal of Numerical Analysis》2002,22(3):359-390
To study a geometric model of the human spine we are led tofinding a constrained minimum of a real valued function definedon a product of special orthogonal groups. To take advantgeof its Lie group structure we consider Newton's method on thismanifold. Comparisons between measured spines and computed spinesshow the pertinence of this approach. 相似文献
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10.
An application of the thermal desorption technique to the study of desorption from the samples with a temperature gradient is discussed. The kinetics of first- and second-order desorption from linearly and exponentially heated samples with a parabolic temperature profile is considered. It is shown that the low-temperature part of the thermal desorption curve is described by the same equations as those for the desorption from the nongradient surface with the less effective area and with the temperature equal to that at the center of the nonuniformly heated sample. The approximate analytical expressions for the amount of adsorbed surface species as a function of time are derived. These expressions enable to find the kinetics order, the activation energy E and the preexponential factor k0 for the desorption process from thermal desorption spectra. In a first approximation the corrections for the nonuniformity of the sample temperature do not substantially change the value of E but slightly increase the value of k0. The correction procedure for k0 is described in detail. The possible application of the proposed method to various experimental conditions is discussed. 相似文献