Showing papers by "Romanian Academy published in 1992"
TL;DR: In this article, the authors present a list of 491 papers dealing with fractional programming and its applications, covering mainly the period 1997-2005 but also including some references published up to 1997 which were not included in the previous bibliographies or which were mentioned as ‘to appear’ in the five previous bibliography.
Abstract: This bibliography of fractional programming is a continuation of five previous bibliographies by the author (Pure Appl. Math. Sci. (India), Vol. XIII, No. 1–2, 35–69, March (1981); ibid. Vol. XVII, No. 1–2, 87–102, March (1983); ibid. XXII, No. 1–2, 109–122, September (1985); Optimization 23(1992)1, 53–71; ibid. 45(1999) 1–4, 343–367). This compilation lists, in alphabetical order by the name of the first author, 491 papers dealing with fractional programming and its applications. This covers mainly the period 1997–2005 but it also includes some references published up to 1997 which were not included in the previous bibliographies or which were mentioned as ‘to appear’ in the five bibliography. In compiling this list we used Mathematical Reviews, Zentralblatt fur Mathematik, Referativnyi Zhurnal (Matematika) and Current Papers on Computers & Control. The papers are either published in some form (in technical journals or as internal reports) or are available only as typewritten manuscripts (for example, as...
125 citations
TL;DR: In this article, it was shown that A has topological stable rank (tsr) one provided that A is simple and the sequence of the dimensions of the spectra of A i is bounded.
Abstract: We consider inductive limits A of sequences A 1 →A 2 →... of finite direct sums of C * -algebras of continuous functions from compact Hausdorff spaces into full matrix algebras. We prove that A has topological stable rank (tsr) one provided that A is simple and the sequence of the dimensions of the spectra of A i is bounded. For unital A, tsr(A)=1 means that the set of invertible elements is dense in A. If A is infinite dimensional, then the simplicity of A implies that the sizes of the involved matrices tend to infinity, so by general arguments one gets tsr(A i )≤2 for large enough is whence trsr(A)≤2. The reduction of tsr from two to one requires arguments which are strongly related to this special class of C * -algebras
112 citations
102 citations
TL;DR: In this paper, an optimal stabilizing compensator for the case of state-dependent white noise was constructed for a single-input single-output (SISO) model with state dependent white noise.
Abstract: Results concerning construction of an optimal stabilizing compensator are obtained for the case of state-dependent white noise
62 citations
56 citations
TL;DR: In this paper, the Cauchy and Poisson formulas in the unit ball of C n are defined by means of appropriate operator-valued kernels, and connections with some problems of dilation theory are made.
54 citations
TL;DR: The new compounds, putative inhibitors of membrane-bound carbonic anhydrase, were tested for inhibitory action on the bovine red cell enzyme.
38 citations
TL;DR: In this paper, the distance to a polyhedron in a normed linear space E = R n was given for the case of R n, endowed with the l ∞ -norm, and it was shown that these estimates are better than a recent estimate by Cook, Gerards, Schrijver, and Tardos.
30 citations
TL;DR: In this article, the authors define a stronger structure which carries information about additive and multiplicative congruences in the valued field, extending the information carried by value groups and residue fields, and discuss the cases where these mixed structures give a solution of the classification problem.
Abstract: In general, the value groups and the residue fields do not suffice to classify the algebraic henselian extensions of a valued fieldK, up to isomorphism overK. We define a stronger, yet natural structure which carries information about additive and multiplicative congruences in the valued field, extending the information carried by value groups and residue fields. We discuss the cases where these “mixed structures” give a solution of the classification problem.
24 citations
TL;DR: The aim of this paper is to present a general result on abstract flowchart schemes and to apply it to the study of accessibility, reduction and minimization.
19 citations
TL;DR: In this article, the distribution of the double-bond pair sequences has been determined from the fine structure of the 13C NMR spectra using binary and ternary catalytic systems based on WCl6 and three classes of organometallic compounds: organoaluminium, organotin and organosilicon.
TL;DR: In this paper, the existence of the smallest convex extension of a convex function to the whole space X is proved, i.e. if the average lies in the set C of convexity.
Abstract: Let C be a solid convex subset of a linear space X and be an algebraically-1.s.c. convex function. We prove the existence of a smallest convex extension of f to the whole space X, i.e. a minimal convex function such that for all x ∊ Cand provide an explicit formula for it. Some properties of the “smallest convex extension”-operator E are derived from this representation As application, we provide a simple, necessary and sufficient condition for a function , convex on C, to satisfy the convexity-lie inequalities for every integer n 2 and all (i.e. if just the average lies in the set C of convexity). Our condition, much weaker than convexity, is that f majorizes the smallest convex extension of fC , the restriction of f to C So we extend the results obtained in [1] under the essential additional assumption that C is algebraically open
TL;DR: In this article, the primal primal problem α = inf λ (W) was shown to be equivalent to the dual problem β = inf W (W), where W ⊂- X ∗ Ω{0} and λ(w) = f h({y ϵ F¦wu(y) ⩾ sup w(XΩΩ)}) or w ϵ W).
TL;DR: For constrained primal infimization problems, some characterizations of the surrogate dual objective functions are given, regarded as functions of three variables (namely, of the primal constraint set, the primal objective function and the dual variable).
Abstract: For constrained primal infimization problems, we give some characterizations of the surrogate dual objective functions, regarded as functions of three variables (namely, of the primal constraint set, the primal objective function and the dual variable). We also give some results on surrogate constraint mappings
TL;DR: In this article, an overall kinetic model for the deep catalytic oxidation of methanol is presented based on the balance of chemical species and could described self-sustained oscillations.
Abstract: An overall kinetic model for the deep catalytic oxidation of methanol is presented. It is based on the balance of chemical species and could described self-sustained oscillations.
TL;DR: Puflea-Ramer et al. as discussed by the authors demonstrated the linearity of microwave parameters and their use in the CAD/CAM of new microwave garnets proposed using a numerical database of microwave data.
30 Aug 1992
TL;DR: Presents a practical method for a supervised object classification by means of a decision-making approach using fuzzy sets and the insensitivity of the classification algorithms to the pattern size, misalignment, the possibility of non-complete symbols recognition, and identification of the information source.
Abstract: Presents a practical method for a supervised object classification by means of a decision-making approach using fuzzy sets. The unknown object membership function, as well as the distance between the input symbol and the chosen prototypes, are computed. The classification is made according to the input pattern which maximizes the membership function. The insensitivity of the classification algorithms to the pattern size, misalignment, the possibility of non-complete symbols recognition, and identification of the information source, are accomplished. >
TL;DR: In this paper, the authors studied the stability of displacement of oil through a porous layer by a less viscous fluid with a polymer solute as forerunner, and proved that the optimal viscosity profile, in the case of a thin region of polymeric solute, is the constant one.
01 Feb 1992
TL;DR: In this article, the difference divisees du premier ordre de l’application f sur les points u, v ∈ X and par [u, v, w, w; f ] the difference division divisee de deuxieme ordre of cette application f on les points U, V, W ∈ x.
Abstract: une equation, ou f : X → X est une application et θ est l’element nul de l’espace X. Designons par [u, v; f ] la difference divisees du premier ordre de l’application f sur les points u, v ∈ X et par [u, v, w; f ] la difference divisee de deuxieme ordre de cette application sur les points u, v, w ∈ X. Ces differences ont ete introduites dans les travaux [1], [2], [5], [6], [7]. Supposons leur symetrie comme fonctions des points sur lesquels elles sont definies. A cote de l’equation (1) nous considerons une application g : X → X a l’aide de laquelle nous construisons la suite (xn) ∞ n=0 fournie par le procede iteratif suivant:
01 Jan 1992
TL;DR: In this paper, the authors give sufficient conditions for the existence of bounded nonnegative solutions of Riccati equations of stochastic control for linear control systems with state-dependent noise.
Abstract: We give sufficient conditions for the existence of bounded nonnegative solutions of Riccati equations of stochastic control. The problem of the existence of an optimal stabilizing compensator for linear control systems with state-dependent noise is discussed.
TL;DR: A linear model of magnetic susceptibility is proposed based on measurements performed on Gd-Al substituted iron garnets, and a CAD/CAM methodology is presented for estimating such properties for novel, yet to be synthesized materials.
TL;DR: In this article, the homomorphisms and automorphisms of the Bunce-Deddens algebras were analyzed and a generalization of homomorphism was proposed.
Abstract: The Bunce-Deddens algebras were introduced in [5]. They are interesting particular examples of inductive limits of the form lim C(Xi, Fi) (where the F/'s are finite dimensional C*-algebras), whose study was suggested in [9]. In this paper we analyse the homomorphisms and the automorphisms of the Bunce-Deddens algebras, since their good knowledge could spread some light in the above general problem raised by E. G. Eίfros.
TL;DR: In this article, the location of the Fe3+ ions in the iron-containing scheelite structures of Bi3FeM02012 and Bi2Fe2Mo20[2] has been investigated by X-ray diffraction.
Abstract: The location of the Fe3+ ions in the iron-containing scheelite structures of Bi3FeM02012 and Bi2Fe2Mo20[2 samples (which have been prepared under various temperature treatments) has been investigated by X-ray diffraction. Mössbauer and electron spin resonance (ESR) spectroscopies. The alteration of the crystalline structure and of the Fe3+ ion location have been followed after static reduction in propylene and reoxidation. The catalytic activity of the samples in the reaction of propylene oxidation to acrolein has been measured. The structural data have indicated for the Bi3FeMo20! 2 samples tetragonal or monoclinic scheelite-type structure for the low (450' C) and high (560 C) temperature preparations, respectively, with the Fe3+ ions located in tetrahedral (4a) sites; this position is not affected by the reduction. A quantitative analysis of the structural data
TL;DR: In this article, the thermal properties of two mononuclear and two polynuclear coordination compounds of lanthanum were investigated. But the results concerning the thermal behavior of these compounds were limited.