Showing papers by "Johannes Kepler University of Linz published in 1981"
TL;DR: It is shown that a fuzzy probability measure is always an integral (if the space is generated) if the authors replace the operations ∧ and ∨ by the t-norm To and its dual S0 (see [6]).
82 citations
TL;DR: In this article, an infinite dimensional version of Penrose's full result is given and extremal characterizations (in terms of the Hermitian order) of A+ and of generalized inverses associated with minimal norm solutions of consistent operator equations or with least-squares solutions.
46 citations
TL;DR: In this paper, the convergence conditions for weak and strong convergence of general regularization methods for linear ill-posed problems in Hilbert space were given, and convergence criteria for Tychonoff regularization, for a regularization method based on Showalter's integral formula and for regularization by truncated iteration.
Abstract: In this paper, we give necessary and sufficient conditions for weak and strong convergence of general regularization methods for the solution of linear ill-posed problems in Hilbert space. As special cases we obtain convergence criteria for Tychonoff regularization, for a regularization method based on Showalter's integral formula, and for regularization by truncated iteration
37 citations
TL;DR: The first experimental results on the effect of a strong magnetic field on the stability of the ferroelectric phase in perovskites are presented in this paper, where the authors show that a magnetic field of 20 T increases the paraelectric phase transition temperature by about 0.3 K for E ⊥ B and by approximately 0.2 K for e ⌈ B.
30 citations
28 citations
TL;DR: In this paper, the long standing problem of solvent dependent absorption spectra of certain bile pigments such as bilirubindimethylester has been solved by measurement of molecular masses by means of vapour pressure osmometry.
Abstract: The long standing problem of solvent dependent absorption spectra of certain bile pigments such as bilirubindimethylester has been solved by measurement of molecular masses by means of vapour pressure osmometry. Using this method and the investigation of the concentration and temperature dependence of the absorption spectra on several model compounds an association equilibrium for pigments of the rubinoid structural type could be confirmed. Moreover the optical properties of the coexisting species and the corresponding equilibrium constants could be deduced by spectroscopic techniques. Verdinoid pigments lacking free carboxylic functions on the other hand tend to be monomeric in solution. A heteroassociated species involving equimolar amounts of a verdinoid and a rubinoid pigment could be verified existing on adsorbents like silicagel.
26 citations
TL;DR: In this article, the energy hypersurface of bile pigments was calculated using a force field model, and two cases were observed: the pigment is substituted symmetrically or unsymmetrically by apolar groups and the barrier between these species amounts to about 40 kJ/mol.
Abstract: The energy hypersurface of rubinoid bile pigments is calculated using a force field model previously described. Two cases are observed. I: The pigment is substituted symmetrically or unsymmetrically by apolar groups. This results in a very shallow energy valley containing several enantiomeric conformers of approximately equal energies. II: Substitution by polar groups, especially in position 8 and 12 of the rubin skeleton, (e.g.−CH2−CH2−COOH) is followed by a “lock in” bonding between such groups and the lactam ring functions. Thereby only two enantiomeric conformers, which are energetically stabilized, are possible. The barrier between these species amounts to about 40 kJ/mol. These results are compared with the experimental facts available so far. An analysis of the corresponding energy hypersurfaces of the diastereomeric forms of (Z,Z)-, (E,Z)-, (Z,E)- and (E,E)-configurations is given as well.
24 citations
01 Jan 1981
21 citations
TL;DR: Substituted azafulvenes were generated by dehydrogenation of 5′-methyl-substitized pyrromethenones with DDQ and characterized by UV- and 1H-NMR-spectroscopy as mentioned in this paper.
Abstract: Substituted azafulvenes were generated by dehydrogenation of 5′-methyl-substituted pyrromethenones withDDQ and characterized by UV- and1H-NMR-spectroscopy. Their electrophilic properties were demonstrated using several quenchers and furthermore they were used for a synthesis of verdinoid bile pigments (which easily can be converted to rubinoid systems by the action of NaBH4) with nearly any desired unsymmetrical alkyl substitution patter: The azafulvene spezies was generated by the action ofDDQ on a 5′-methylpyrromethenone and was quenched by an 5′-unsubstituted pyrromethenone. The resulting rubinoid adduct was dehydrogenated immediatly byDDQ — yields were good to high.
21 citations
19 citations
TL;DR: In this paper, the temperature dependence of the ferroelectric mode frequency in SrTiO3 with oxygen vacancies and free electrons was quantitatively explained on the basis of a microscopic model for the soft modes.
Abstract: The temperature dependence of the ferroelectric mode frequency in SrTiO3 with oxygen vacancies and free electrons, is quantitatively explained on the basis of a microscopic model for ferroelectric soft modes.
TL;DR: In this article, the synthesis of the following Cu(I) and Fe(II) complexes with N,N-dimethylthioformamide (DMTF) and N, Ndimethylformamide(DMF) are described.
TL;DR: In this paper, a tree-like modification of Baernstein's space is constructed, which has the Banach-Saks property and does not have Banach Skas property.
Abstract: We construct a Banach spaceE, which has the Banach-Saks property and such thatL2(E) does not have the Banach-Skas property. The construction is a somewhat tree-like modification of Baernstein’s space.
TL;DR: In this article, the authors calculate the observable critical temperature dependence of the transport coefficients entering the hydrodynamic form of the dynamic structure factor of 4He below Tλ. This resolves a long-standing problem in the critical dynamics below the superfluid transition of4He.
Abstract: We calculate the observable critical temperature dependence of the transport coefficients entering the hydrodynamic form of the dynamic structure factor of4He belowTλ. Application of our recently introduced nonlinear renormalization-group analysis yields quantitative agreement with previous light scattering experiments in the hydrodynamic region. This resolves a long-standing problem in the critical dynamics below the superfluid transition of4He.
TL;DR: A simple method to treat the so-called Heywood case in the minres method in factor analysis requiring less computing time and enjoying higher numerical stability is described.
Abstract: The method proposed by Harman and Fukuda to treat the so-called Heywood case in the minres method in factor analysis i.e., the case where the resulting communalities are greater than one, involves the frequent solution of eigenvalue problems. A simple method to treat this problem requiring less computing time and enjoying higher numerical stability is described in this paper.
TL;DR: In this article, sound propagation near structural phase transitions is studied in cubic systems with a 3-component order parameter and tetragonal systems including SrTiO3 under biaxial pressure.
Abstract: Sound propagation near structural phase transitions is studied. We investigate cubic systems with a 3-component order parameter and tetragonal systems including SrTiO3 under biaxial pressure. The dynamical scaling function for the damping is computed by a dynamical RNG analysis.
TL;DR: In this paper, a force field model was designed with respect to the special needs of bile pigments, which was parametrized and tested using partial structures of the pigments as well as an integral pigment.
Abstract: A force field model was designed with respect to the special needs of bile pigments. It is parametrized and tested using partial structures of bile pigments as well as an integral pigment; the solution structures of the molecules were previously deduced using independent experimental methods.
TL;DR: In this article, the crossover behavior in the dynamics near the Lambda transition of 4He is analyzed on the basis of the complete renormalization-group flow equations for the asymmetric-spin model (F) in two-loop order.
Abstract: The crossover behaviour in the dynamics near the Lambda transition of4He is analyzed on the basis of the complete renormalization-group flow equations for the asymmetric-spin model (F) in two-loop order. Our results confirm the conclusions and refine the results obtained from an earlier analysis based on the symmetric model (E) and invalidate part of a recent analysis treating model F in an unsystematic approximation. Excellent agreement is found with measurements of second-sound damping over four decades in relative temperature. Closer toTλ our analysis predicts a further increase of the effective amplitudeRλeff of the thermal conductivity.
04 May 1981
TL;DR: This paper describes the architecture of an innovative modular crossbar switch for large-scale multiprocessor systems; its modular design principle is given a particularly thorough treatment.
Abstract: This paper describes the architecture of an innovative modular crossbar switch for large-scale multiprocessor systems; its modular design principle is given a particularly thorough treatment. The crucial points of this design principle are the utilization of bit-serial buses and an integration of a combination of crosspoints with its own microprogrammed controller, (which is designated as "configurational processor") into a single building block, preferably an IC. This innovative concept allows the implementation of full crossbar switches for systems up to about 128 processors at relatively low cost. The expense of a crossbar for a system with approximately 1024 processing elements is then comparable to that of the other parts of the whole system.A particular implementation of such a crossbar switch is embedded in a large-scale multimicroprocessor system being built at the Johannes Kepler University in Linz, Austria. This implementation is discussed in detail; emphasis is given to the complexity of its functional elements and its hardware expense. Since no ICs have yet been produced for the realization of the new building block for the crossbar mentioned above, this building block is realized on a printed circuit board using standard LSI-circuits.
TL;DR: The static dielectric constant of Pb1−xGexTe (0≦x≦0.05) has been determined from differential capacitance measurements on Schottky-barriers in the temperature range of 4.2-300 K.
Abstract: The static dielectric constant of Pb1−xGexTe (0≦x≦0.05) has been determined from differential capacitance measurements on Schottky-barriers in the temperature range of 4.2–300 K. A comparison with data deduced from the phonon frequencies via the Lyddane-Sachs-Teller relation shows substantial discrepancies which are attributed to lattice defects.
TL;DR: In this paper, the authors gave a partial uniqueness of unconditional bases under more restrictive conditions and showed that unconditional bases can be found in the Banach spaces under certain conditions, such that for alla i∈Ri=1,...,n==================
Abstract: Suppose{e i} i=1 n and{f i} i=1 n are symmetric bases of the Banach spacesE andF. Letd(E,F)≦C andd(E,l n 2 )≧n' for somer>0. Then there is a constantC r=Cr(C)>0 such that for alla i∈Ri=1,...,n
$$C_r^{ - 1} \left\| {\sum\limits_{i = 1}^n {a_i e_i } } \right\| \leqq \left\| {\sum\limits_{i = 1}^n {a_i f_i } } \right\| \leqq C_r \left\| {\sum\limits_{i = 1}^n {a_i e_i } } \right\|$$
We also give a partial uniqueness of unconditional bases under more restrictive conditions.
01 Jan 1981
TL;DR: Point processes P are probability measures on the set N of all integer valued Radon measures μ on a certain phase space T which for most of the applications is ℤd (lattice models) or ℝd (continuous models).
Abstract: Point processes P are probability measures on the set N of all integer valued Radon measures μ on a certain phase space T which for most of the applications is ℤd (lattice models) or ℝd (continuous models). The name “point process” comes from the fact, that an integer valued Radon measure can be identified with a corresponding configuration of points in the phase space.
TL;DR: In this paper, a formula is derived which allows the correction of the measured number of counts of characteristic X-ray peaks due to residual pile-up losses in PIXE spectra obtained by triggered beam pulsing.
TL;DR: In this paper, the saturation magnetization and the paramagnetic moment show a maximum at x = 1.3, 1.2 and 1.8, respectively, at the Curie-temperature (80 K).
TL;DR: In this paper, conductivity measurements have been performed on solutions of the following salts in N,N -dimethylthioformamide (DMTF) at 25°C.
TL;DR: In this article, an increase of fundamental interband absorption due to applied electric fields up to 150 V cm −1 has been found in highly doped n -PbTe at 80 K. The results can be explained by an electron temperature model.
TL;DR: In this paper, die verwendung von reversed phase Platten konnen brauchbare Auftrennungen erreicht werden, der quantitative bestimmung erfolgt nach Umsetzung zu fluoreszierenden Produkten durch fluorimetrische Direktauswertung.
Abstract: Das dunnschichtchromatographische Verhalten einiger Digitalis Cardenolide wird an neuen Schichtmaterialien untersucht. Durch die Verwendung von reversed phase Platten konnen brauchbare Auftrennungen erreicht werden. Diese Methode wird fur die Qualitatskontrolle von α-Acetyldigoxin angewendet. Die quantitative Bestimmung erfolgt nach Umsetzung zu fluoreszierenden Produkten durch fluorimetrische Direktauswertung.
01 Oct 1981
TL;DR: The power for a full day's production called off from a large Hydro Energy plant is to be generated with minimum losses of potential energy with help of a globalized optimization algorithm.
Abstract: Die im Verlauf eines Tages von einem Jahresspeicherkraftwerk abgerufene Leistung soll mit einem Minimum an potentieller Energie erzeugt werden Die Tagesganglinie ist auf Grund einer Prognose gegeben Zunachst wird fur das Kraftwerk eine Tagesoptimierung durchgefuhrt Diese sehr aufwendige Berechnung erfolgt offline uber den gesamten jeweils moglichen Leistungs- und Hohenbereich mit einem globalisierten Optimierungsverfahren Der optimale Schaltplan wird mit einem Modell der dynamischen Optimierung berechnet Beispielsrechnungen fur konkrete Kraftwerke liegen vor
TL;DR: In this article, the continuous dependence of solutions to these equations on the parameter is investigated in a Banach space in the framework of generalized inverses, where the integral operators involved have the property that the dimension of their nullspaces changes between two nonzero values as the parameter tends to zero.
Abstract: The treatment of certain electro- and magnetostatic boundary and transmission problems by boundary integral equations leads to parameter-dependent integral equations of the second kind. The integral operators involved have the property that the dimension of their nullspaces changes between two nonzero values (depending on the geometry of the problem) as the parameter tends to zero. We investigate the continuous dependence of solutions to these equations on the parameter. To this end, we treat the problem of continuous dependence of solutions to parameter-dependent linear operator equations of the second kind in a Banach space in the framework of generalized inverses.
TL;DR: It is suggested that relevant continuous attributes of concepts are stored as fuzzy restrictions over the possible values of attribute dimensions, reflecting the frequency of their appearance, which defines a fuzzy multiattribute space.