Progress in Theoretical Chemistry and Physics, 2002
The local-scaling transformation (LST) variational method is used to derive an energy functional ... more The local-scaling transformation (LST) variational method is used to derive an energy functional which depends on R dynamical variables, the LST functions realizing the transformation of the R orbitals involved in the expansion of the model N-fermion wave function. The solution of the Euler-Lagrange system with respect to these variables leads to the determination of approximate ground-state properties for the
Progress in Theoretical Chemistry and Physics, 2002
In the formalism of reduced density matrices and functions, using the irreducible tensor-operator... more In the formalism of reduced density matrices and functions, using the irreducible tensor-operator technique and the space-spin separation scheme, the matrix elements of one of the main spin-relativistic corrections of the Breit-Pauli Hamiltonian, the spin-orbit interactions, are expressed in a form suitable for numeric implementation. A comparison with other methods is made and the advantages of such an approach are
We apply the local-scaling transformation (LST) method to core-valence split, model wavefunctions... more We apply the local-scaling transformation (LST) method to core-valence split, model wavefunctions (CVS-MWF) for openshell atoms described by the LS coupling scheme. We derive an explicit form for the total energy in terms of single-particle repulsion and exchange functionals of the LST scalar function f(r), and write the corresponding Euler-Lagrange integrodifferential equation, which involves derivatives of f(r) up to the fourth order. Solving numerically this equation would yield the density r LS (r) and energy E LS within the orbit described by the CVS-MWF. A formal illustration is given with the lithium atom. ᭧
The transfer of the mashup paradigm in corporate environments needs additional capabilities beyon... more The transfer of the mashup paradigm in corporate environments needs additional capabilities beyond those typically associated with consumer mashups. In this paper, we present the architecture of the FAST platform which allows creating enterprise-class and multi-channel visual building blocks (so called gadgets) in an ad-hoc manner. The design of complex enterprise-class gadgets is supported by an integrated semantic concept which hides the complexity from the actual users. The architectural components of the platform, a technical life cycle model for enterprise mashups, and the FAST gadget ontology are presented. By means of a cross-organizational real-world scenario from the marketing/ promotion event area, we demonstrate the value and potential of the FAST platform.
A new kind of Web-based application, known as Enterprise Mashups, has been gaining momentum in th... more A new kind of Web-based application, known as Enterprise Mashups, has been gaining momentum in the last years: Business users with no or limited programming skills are empowered to leverage in a collaborative manner existing Mashup components and to combine and reuse existing Web-based resources within minutes to new value added applications in order to solve individual and adhoc business problems. In the frame of the EU funded research project FAST, we are currently developing a new platform which allows business users to build usercentric, enterprise class Mashups. In contrast to existing approaches focusing on mashing up heteogeneous data sources, the envisioned FAST platform proposes a screen flow design resulting in so called gadgets which can be executed in various environments -reaching from Enterprise Mashup environments, social networks, and mobile devices to local desktop applications. The underlying concepts and a first prototype of the FAST Platform are presented in this poster session.
We performed self-consistent calculations of the oscillating part of the ground-state energy of a... more We performed self-consistent calculations of the oscillating part of the ground-state energy of atoms and cations from Be through Ca, using Strutinsky's shellcorrection method in the framework of the extended Kohn-Sham scheme. New "transition state" numbers in the Taylor series expansion of the ground-state energy are introduced, allowing the elimination of the second-order shell-correction term. We show that the application of this procedure yields practically identical results whether it is performed self-consistently or not, and even the first-order term of the shell-correction series gives a good approximation. Oscillations in the shell-correction energy of cations appear amplified with respect to those of the corresponding isoelectronic neutral atoms.
Progress in Theoretical Chemistry and Physics, 2002
The local-scaling transformation (LST) variational method is used to derive an energy functional ... more The local-scaling transformation (LST) variational method is used to derive an energy functional which depends on R dynamical variables, the LST functions realizing the transformation of the R orbitals involved in the expansion of the model N-fermion wave function. The solution of the Euler-Lagrange system with respect to these variables leads to the determination of approximate ground-state properties for the
Progress in Theoretical Chemistry and Physics, 2002
In the formalism of reduced density matrices and functions, using the irreducible tensor-operator... more In the formalism of reduced density matrices and functions, using the irreducible tensor-operator technique and the space-spin separation scheme, the matrix elements of one of the main spin-relativistic corrections of the Breit-Pauli Hamiltonian, the spin-orbit interactions, are expressed in a form suitable for numeric implementation. A comparison with other methods is made and the advantages of such an approach are
We apply the local-scaling transformation (LST) method to core-valence split, model wavefunctions... more We apply the local-scaling transformation (LST) method to core-valence split, model wavefunctions (CVS-MWF) for openshell atoms described by the LS coupling scheme. We derive an explicit form for the total energy in terms of single-particle repulsion and exchange functionals of the LST scalar function f(r), and write the corresponding Euler-Lagrange integrodifferential equation, which involves derivatives of f(r) up to the fourth order. Solving numerically this equation would yield the density r LS (r) and energy E LS within the orbit described by the CVS-MWF. A formal illustration is given with the lithium atom. ᭧
The transfer of the mashup paradigm in corporate environments needs additional capabilities beyon... more The transfer of the mashup paradigm in corporate environments needs additional capabilities beyond those typically associated with consumer mashups. In this paper, we present the architecture of the FAST platform which allows creating enterprise-class and multi-channel visual building blocks (so called gadgets) in an ad-hoc manner. The design of complex enterprise-class gadgets is supported by an integrated semantic concept which hides the complexity from the actual users. The architectural components of the platform, a technical life cycle model for enterprise mashups, and the FAST gadget ontology are presented. By means of a cross-organizational real-world scenario from the marketing/ promotion event area, we demonstrate the value and potential of the FAST platform.
A new kind of Web-based application, known as Enterprise Mashups, has been gaining momentum in th... more A new kind of Web-based application, known as Enterprise Mashups, has been gaining momentum in the last years: Business users with no or limited programming skills are empowered to leverage in a collaborative manner existing Mashup components and to combine and reuse existing Web-based resources within minutes to new value added applications in order to solve individual and adhoc business problems. In the frame of the EU funded research project FAST, we are currently developing a new platform which allows business users to build usercentric, enterprise class Mashups. In contrast to existing approaches focusing on mashing up heteogeneous data sources, the envisioned FAST platform proposes a screen flow design resulting in so called gadgets which can be executed in various environments -reaching from Enterprise Mashup environments, social networks, and mobile devices to local desktop applications. The underlying concepts and a first prototype of the FAST Platform are presented in this poster session.
We performed self-consistent calculations of the oscillating part of the ground-state energy of a... more We performed self-consistent calculations of the oscillating part of the ground-state energy of atoms and cations from Be through Ca, using Strutinsky's shellcorrection method in the framework of the extended Kohn-Sham scheme. New "transition state" numbers in the Taylor series expansion of the ground-state energy are introduced, allowing the elimination of the second-order shell-correction term. We show that the application of this procedure yields practically identical results whether it is performed self-consistently or not, and even the first-order term of the shell-correction series gives a good approximation. Oscillations in the shell-correction energy of cations appear amplified with respect to those of the corresponding isoelectronic neutral atoms.
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Papers by I. Delchev