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41.
42.
Aurelian Rotaru Marinela M. Dîrtu Cristian Enachescu Radu Tanasa Jorge Linares Alexandru Stancu Yann Garcia 《Polyhedron》2009,28(13):2531-2536
Motivated by the application of the First Order Reversal Curve (FORC) technique to obtain a distribution of like spin domains in the spin crossover complexes [FexM1−x(btr)2(NCS)2]·H2O with MII = Zn and Ni, we have performed Differential Scanning Calorimetry (DSC) experiments. We have measured the heat capacity in the heating and cooling modes and then calculated the enthalpy and the entropy variations at the phase transition. In the framework of an Ising-like model, we have converted the experimental thermal hysteresis into terms of physical parameters related to these compounds. We have also performed a statistical analysis of these parameters and concluded that the correlation between them increases with the dilution degree of these spin crossover complexes. 相似文献
43.
Aurelian Rotaru Adrian Carmona Flavien Combaud Jorge Linares Alexandru Stancu Jamil Nasser 《Polyhedron》2009,28(9-10):1684-1687
In this contribution we have simulated, using the Monte Carlo–Metropolis technique, the thermal behavior of an one dimensional and of a square lattice spin crossover system.In the one dimensional case, a long-range interaction parameter must be included in order to obtain a thermal hysteresis. For the square lattice we have tacked into account the nearest as well the next-nearest neighbors. We show the role of the elastic constant ratio on the hysteresis width. 相似文献
44.
Elena Pahonu Maria Proks Sergiu Shova Gina Lupacu Diana‐Carolina Ilie tefania‐Felicia Brbuceanu Laura‐Ileana Socea Mihaela Badea Virgil Punescu Dorin Istrati Aurelian Gulea Doina Drgnescu Cristina Elena Dinu Pîrvu 《应用有机金属化学》2019,33(11)
A series of Cu(II), Co(II), Pd(II), Pt(II), Zn(II), Cd(II) and Fe(III) complexes were designed and synthesized using Schiff base 1‐phenyl‐2,3‐dimethyl‐4‐(N‐3‐formyl‐6‐methylchromone)‐3‐pyrazolin‐5‐one (HL). The new metal complexes were investigated using various physicochemical techniques including elemental and thermal analyses, molar electric conductivity and magnetic susceptibility measurements, as well as spectroscopic methods. Also, the crystal structures of ligand HL and the Pd(II) complex were determined using single‐crystal X‐ray diffraction analysis. For all compounds, the antimicrobial activity was studied against a series of standard strains: Staphylococcus aureus, Bacillus cereus, Enterococcus faecalis, Escherichia coli, Acinetobacter baumannii, Candida albicans, Candida krusei and Cryptococcus neoformans. The in vitro antiproliferative activity of the ligand and complexes was evaluated against ten cancer cell lines: MSC, A375, B16 4A5, HT‐29, MCF‐7, HEp‐2, BxPC‐3, RD, MDCK and L20B. At 10 μM concentration a significant cytotoxic effect of the Co(II), Pd(II) and Cd(II) complexes was observed against B16 4A5 murine melanoma cells. The Zn(II) complex is active against HEp‐2, RD and MDCK cancer cell lines, where IC50 values vary between 1.0 and 77.6 and for BxPC‐3 the activity index versus doxorubicin is 3.7 times higher. 相似文献
45.
46.
In this paper we study hermitian kernels invariant under the action of a semigroup with involution. We characterize those
hermitian kernels that realize the given action by bounded operators on a Kre?n space. This is motivated by the GNS representation
of *-algebras associated to hermitian functionals, the dilation theory of hermitian maps on C
*-algebras, as well as others. We explain the key role played by the technique of induced Kre?n spaces and a lifting property
associated to them.
Received: 27 March 2000/ Accepted: 5 September 2000 相似文献
47.
48.
In previous works we analysed conditions for linearization of Hermitian kernels. The conditions on the kernel turned out to
be of a type considered previously by L. Schwartz in the related matter of characterizing the real linear space generated
by positive definite kernels. The aim of the present note is to find more concrete expressions of the Schwartz type conditions:
in the Hamburger moment problem for Hankel type kernels on the free semigroup, in dilation theory (Stinespring type dilations
and Haagerup decomposability), as well as in multi-variable holomorphy.
Prof. Tiberius Constantinescu died unexpectly on 29th of July 2005. 相似文献
49.
We present a generalized operator range construction associated to an indefinite unbounded selfadjoint operator that yields
closed embeddings of Kreĭn spaces. As an application we obtain an energy space representation, in the sense of Friedrichs,
of a general free Dirac operator. 相似文献
50.
Aurelian Bejancu 《Constructive Approximation》2011,34(2):237-256
Duchon’s method of thin plate splines defines a polyharmonic interpolant to scattered data values as the minimizer of a certain
integral functional. For transfinite interpolation, i.e., interpolation of continuous data prescribed on curves or hypersurfaces,
Kounchev has developed the method of polysplines, which are piecewise polyharmonic functions of fixed smoothness across the
given hypersurfaces and satisfy some boundary conditions. Recently, Bejancu has introduced boundary conditions of Beppo–Levi
type to construct a semicardinal model for polyspline interpolation to data on an infinite set of parallel hyperplanes. The
present paper proves that, for periodic data on a finite set of parallel hyperplanes, the polyspline interpolant satisfying
Beppo–Levi boundary conditions is in fact a thin plate spline, i.e., it minimizes a Duchon type functional. The construction
and variational characterization of the Beppo–Levi polysplines are based on the analysis of a new class of univariate exponential
ℒ-splines satisfying adjoint natural end conditions. 相似文献