Showing papers by "University of Warsaw published in 1985"
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01 Jan 19851,289 citations
TL;DR: The steady-state scattering function for driven diffusive systems with a single conserved density is investigated and it is found that d = 2 is the borderline dimension with marginally nondiffusive behavior; for d larger than 2 the spread is diffusive with anisotropic long-time-tail corrections.
Abstract: The steady-state scattering function for driven diffusive systems with a single conserved density is investigated in view of the intrinsically faster, as compared to the predictions of an ordinary diffusion law, spreading of density fluctuations observed in stationary driven diffusive systems at low dimensionality, and, consequently, the divergence of excess noise for small frequencies. It is found that d = 2 is the borderline dimension with marginally nondiffusive behavior; for d larger than 2 the spread is diffusive with anisotropic long-time-tail corrections. The derivations presented are confirmed by Monte Carlo simulation results for a driven hard-core lattice gas.
234 citations
TL;DR: In this paper, a dependence between the acidity and basicity parameters of water/alcohol mixtures with ten organic solvents has been found, and the dependence between these parameters and E N T on B KT dependence is more complex even if these parameters are purified from nonspecific solute/solvent interactions.
200 citations
TL;DR: For both the U.S. and Poland, this article developed measurement models of the family's social-stratification position and of parents' and children's valuations of self-direction.
Abstract: For both the U.S. and Poland, we develop measurement models of the family's social-stratification position and of parents' and children's valuations of self-direction. We find that the relationship between parents' and children's values is much stronger than past studies had indicated. In both countries the family's stratification position has an impressive bearing on the values of its adolescent and young-adult offspring. Much of this impact is through social stratification affecting parents' values, and parents' values, in turn, affecting children's values. Social stratification affects parental values primarily because of the impact of parents' occupational self-direction on their values. Although parents' and children's values may be reciprocally related, the predominant effects are from parents' to children's values. The one notable cross-national difference we find is in the relative roles of fathers and mothers in the intergenerational transmission of values: in the United States, fathers play at least as important a role as do mothers; in Poland, mothers play the predominant role.
194 citations
TL;DR: In this article, a complete presentation of the ideas and results of the approach of soliton surfaces (manifolds) is presented, and a particular attention is paid to integrable classical string models.
Abstract: The paper contains a complete presentation of the ideas and results of the approach of soliton surfaces (manifolds). In this approach any n-dim. soliton system with a matrix real semi-simple Lie algebra g possesses its own geometry of n-dim. submanifolds of g. Various applications of this approach are discussed. A particular attention is paid to integrable classical string models.
170 citations
TL;DR: Fusion of blastomeres of 2-cell mouse embryos with an intact zona pellucida can be induced with electric pulses and an electrolyte solution can be used instead of a non-electrolyte solution to ensure viability.
154 citations
TL;DR: In this paper, the problem of active suspension control of a two-degree-of-freedom vehicle travelling on a randomly profiled road is studied, where the suspension system is optimized with respect to ride comfort, road holding and working space of the suspension.
141 citations
TL;DR: From the study it followed that the partial coherences are the proper measure of the synchronization of brain structures and their intrinsic relationships.
Abstract: A parametric autoregressive model was applied to the multichannel EEG time series. Small statistical fluctuations of the spectral estimates obtained from the short data strings made possible to follow the time changes of the signals. The multiple and partial coherences were calculated for the four channel process and compared with the coherences computed between the pairs of channels. From the study it followed that the partial coherences are the proper measure of the synchronization of brain structures and their intrinsic relationships. The partial phase spectra give the information about the phase delays. The advantages of the parametric description of signals in the frequency domain in respect to the modelling of dynamic systems was pointed out.
138 citations
TL;DR: A clustering algorithm making use of some properties of Sugeno's g λ measure is presented and its performance, when run on the well-known set of the iris data, is briefly described.
108 citations
TL;DR: The analysis of stress in Polish compounds substantiates the claim of current prosodic theory that phonological structure need not be isomorphic to morphological structure.
74 citations
TL;DR: A simple theory for hopping diffusion in hard-core lattice gases predictions for the mean square displacement of a tracer particle as a function of time are found to be in good agreement with the results of Monte Carlo simulations on a quadratic lattice.
Abstract: A simple theory is developed for hopping diffusion in hard-core lattice gases. Its predictions for the mean square displacement of a tracer particle as a function of time are found to be in good agreement with the results of Monte Carlo simulations on a quadratic lattice. For long times a logarithmic term is found in accord with mode-coupling predictions. Our predictions for the tracer diffusion coefficient agree with those of Tahir-Kheli.
TL;DR: In this article, necessary and sufficient conditions for the existence of a solution to the pole placement problem by periodic output feedbacks for single-input single-output linear discrete-time systems are established.
TL;DR: In this paper, the influence of adsorbed tin and tin(IV) ions on the oxidation of methanol chemisorbed species as well as the methanoline from the bulk of the solution was studied on a Pt electrode by voltammetric and radiometric methods.
TL;DR: A cyanide-insensitive superoxide dismutase was purified from tomato leaves to apparent homogeneity and comparison of amino acid composition indicated a closer relationship to the Mn-containing enzymes rather than to other Fe-containing superoxide Dismutases.
Abstract: A cyanide-insensitive superoxide dismutase was purified from tomato leaves (Lycopersicon esculentum, Mill., var. Venture) to apparent homogeneity. The enzyme had twofold higher specific activity (about 4000 standard units) than ferric superoxide dismutases purified from Brassica campestris [Salin, M. L. and Bridges, S. M. (1980) Arch. Biochem. Biophys. 201, 369–374] and Nuphar luteum [Salin, M. L. and Bridges, S. M. (1982) Plant Physiol. 69, 161–165].
The protein had a relative molecular mass of about 42000 and was composed of two equal subunits noncovalently joined. It was negatively charged (pI = 4.6) and contained about 1.45 mol Fe/mol dimer and negligible amounts of Mn, Cu and Zn. Absorption spectrum and sensitivity to NaN3, H2O2 and temperature are also reminiscent of other ferric superoxide dismutases.
Comparison of amino acid composition indicated, however, a closer relationship to the Mn-containing enzymes rather than to other Fe-containing superoxide dismutases. Two possible ways of Fe-containing superoxide dismutase acquisition by vascular plants were suggested.
TL;DR: The representation of the EEG time series as a superposition of the resonant modes with characteristic decay factors seems a valuable method of the analysis of the signal, since it offers high reduction of the data to the few parameters of a clear physiological meaning.
Abstract: EEG time series were modeled as an output of the linear filter driven by white noise. Parameters describing the signal were determined in a way fulfilling the maximum entropy principle. Transfer function and the impulse response function were found. The solutions of the differential equations describing the system have the form of the damped oscillatory modes. The representation of the EEG time series as a superposition of the resonant modes with characteristic decay factors seems a valuable method of the analysis of the signal, since it offers high reduction of the data to the few parameters of a clear physiological meaning.
TL;DR: In this article, a 46 mg/cm2 thick natW target was irradiated with an 11.5 MeV/u 82Se beam and the decay properties of the nuclei 61Mn, 63Fe, 63Co and 69Cu were measured for the first time.
TL;DR: In this article, an ensemble of properly distanced micro mercury film electrodes (MMFE) was used in cyclic and anodic stripping voltammetry, and the experimental results were compared with the anode stripping theory, and agreement was found to be satisfactory.
TL;DR: Under constant conditions, locomotor activity in about 50% of 63 adult Musca domestica continued to be rhythmic after bilateral severance of optic tracts or bilateral lobectomy, apparently indicating the optic lobes of Musca do not contain the oscillator for rhythmic control of locomotoractivity as has been proposed for other insects.
Abstract: Under constant conditions, locomotor activity in about 50% of 63 adult Musca domestica continued to be rhythmic after bilateral severance of optic tracts or bilateral lobectomy. Apparently, the optic lobes of Musca do not contain the oscillator for rhythmic control of locomotor activity as has been proposed for other insects. In 20% of the individuals, several circadian components of activity rhythms were found after operation indicating a role of the optic lobes in the coupling of oscillators. The remaining 30% of the flies with severed optic tracts appeared to be arrhythmic. Most of these flies had vacuolized tissue in the central brain. However, disruption of rhythmicity did not correlate with a common pattern of degeneration. Therefore no conclusions can be drawn as to the localization of the circadian control of locomotor activity in the brain. Flies showing an arrhythmic activity pattern could still be synchronized by LD cycles. Activity did not occur solely during the light period as is the case in controls; but was phase delayed by about 6 hr towards the dark period. Since all flies with severed optic tracts could be synchronized by LD cycles, Musca domestica must possess extraocular photoreceptors.
TL;DR: Application of ND inhibits chromosome movements during anaphase and telophase of either meiotic division, but does not prevent separation of kinetochores in some of the blocked restitutive nuclei.
TL;DR: It is shown that the molecular effects are crucial for accurately determining the neutrino mass from a tritium ..beta..-decay experiment.
Abstract: The $\ensuremath{\beta}$-decay energy spectrum which results from the decay of one of the nuclei in the ${\mathrm{T}}_{2}$ molecule has been computed. An accurate, explicitly correlated basis set was used to describe electronic states of both the parent and the daughter molecules, and effects of nuclear motion have been taken into account. All the channels which meaningfully affect the spectrum have been incorporated, including resonance and scattering channels. The spectra are presented for several neutrino masses. It is shown that the molecular effects are crucial for accurately determining the neutrino mass from a tritium $\ensuremath{\beta}$-decay experiment.
TL;DR: Gorczanski et al. as mentioned in this paper showed that freezing or desiccation of winter rape leaves (Brassica napus L var oleifera (cv Gorczanski) stimulated both lipoxygenase (EC 1131112) activity and ethylene formation during the post-stress period.
Abstract: Freezing or desiccation of winter rape leaves (Brassica napus L var oleifera (cv Gorczanski) stimulated both lipoxygenase (EC 1131112) activity and ethylene formation during the post-stress period The effect depended on the degree of membrane injury In tissues showing injury less than 50% (as checked with the electrical conductivity method) both activities increased according to the degree of stress-induced damage In leaves injured to a higher degree both activities decreased Light and low temperature (5°C) inhibited the development of both lipoxygenase activity and ethylene formation in leaf disks stored for 20 h Ethylene formation was also observed in a model system where soybean lipoxygenase was added to a mixture containing 1-aminocyclopropane-1-carboxylic acid and linoleic or linolenic acid as substrate for lipoperoxide formation Changes in pH and temperature conditions of the incubation mixture caused similar differences in the lipoxygenase activity and ethylene formation We propose that the stimulation of lipoxygenase-catalysed oxidation of polyunsaturated fatty acids (increasing free radical formation) leads to an increased ethylene production from ACC
TL;DR: In this paper, a thorough analysis of the geometry of Fredholm pairs of subspaces in Hilbert space and especially of the spaces of Cauchy data is undertaken, leading to alternative views of the Calderon projector, the Dirichlet problem, and other local elliptic boundary value problems; views where main results can be obtained through explicit transparent calculations.
Abstract: In the second part of our paper we continue the study of elliptic operators which take the form A = GA (a/at + Bt) near a submanifold of codimension 1. The index of the general linear conjugation problem (“cutting and pasting” of elliptic operators) is determined. A thorough analysis of the geometry of Fredholm pairs of subspaces in Hilbert space and especially of the spaces of Cauchy data is undertaken. These methods lead to alternative views of the Calderon projector, the Dirichlet problem, and other local elliptic boundary value problems; views where main results (old and new ones) can be obtained through explicit transparent calculations.
TL;DR: In this article, the influence of short half-lives on the r-process calculations of nuclear abundances is discussed, and it is concluded that a significantly higher neutron density than the one obtained from explosive helium burning in supernovae is needed to reproduce the observe abundances around A=80.
TL;DR: In this article, the authors reviewed the theoretical foundations of the light cone perturbation theory, including QCD, and stressed the existence of the physical vacuum in the light-cone approach, which allows to build the Fock space basis, and gave the possibility of formulating systematic approximations to the structure of hadrons.
TL;DR: The Polish Geophysical Expedition to West Antarctica in the summer of 1979-1980 was organized by the Institute of Geophysics of the Polish Academy of Sciences as discussed by the authors, where the purpose of the expedition was to carry out studies of deep structures of the Earth's crust by reflection, refraction and deep seismic sounding methods.
TL;DR: In this paper, the solubilities of octadecanoic, eicosanoic, docosanic, and o-toluic acids in binary solvents consisting of a common component (cyclohexane) and a varying second component (heptane, ethanol, methanol, 2-propanol, and 1-butanol) have been measured by a dynamic method from 290 to 340 K.
Abstract: Reasonable estimates of ternary solid-liquid equilibrium can be obtained by application of the Wilson and UNIFAC models. The solubilities of octadecanoic, eicosanoic, docosanoic, and o-toluic acids in binary solvents consisting of a common component (cyclohexane) and a varying second component (heptane, ethanol, methanol, 2-propanol, and 1-butanol) have been measured by a dynamic method from 290 to 340 K. The systems containing cyclohexane-alcohols mixed solvents were found to exhibit a synergistic effect of solubility. The best prediction was obtained for the Wilson equation utilizing temperature dependent Λij parameters. For solubilities in nonpolar solvents, the standard deviations for predicted solubilities are comparable to the experimental errors.
TL;DR: In this paper, an interpretation of the Raman and infrared phonon spectra in Bi12GeO20 and Bi12SiO20 crystals is proposed, and the frequencies of motion and the force constants of the tetrahedral GeO4 and SiO4 units are determined.
Abstract: An interpretation of the Raman and infrared phonon spectra in Bi12GeO20 and Bi12SiO20 crystals is proposed. Some quasi-molecular units are distinguished due to the presence of heavy bismuth atoms in the crystal lattice. The frequencies of motion and the force constants of the tetrahedral GeO4 and SiO4 units are determined. Moreover, the frequencies of the stretching modes of A and F symmetry of the BiO bonds are considered and the stretching force constants for the BiO bonds are calculated. The results are in good agreement with the Raman and infrared data obtained in the recent works.
On a propose une interpretation de spectres Raman et infrarouge associes aux phonons dans les cristaux Bi12GeO20 et Bi12SiO20. En rapport avec la presence des atomes massives de bismuth certain unitees quasi-moleculaire ont ete distinguees dans le reseau cristallin. On a determine les frequences de mouvement et les constantes de force des unitees tetrahedrales GeO4 et SiO4. De plus, les frequences de vibrations de valence de symmetrie A et F ont ete discutees et les constantes de force pour les liaison BiO ont ete calculees. Les resultats de ces calcules sont dans un bon accord avec les donnees publiees resemment.
01 Sep 1985
TL;DR: In this paper, a closed 3-braid with axis Lγ is considered and the exterior is a fibre bundle over S1 with fiber a disc with 3 holes, and the monodromy is given by a matrix in PSL(2) and the braid γ is called hyperbolic if its matrix is Hyperbolic.
Abstract: Let be a closed 3-braid in S3 with axis Lγ. The exterior of γ U Lγ in S3 is a fibre bundle over S1 with fibre a disc with 3 holes. The monodromy is given by a matrix in PSL(2,) and the braid γ is called hyperbolic if its matrix is hyperbolic.
TL;DR: In this paper, a modified static method for the ternary systems methanol-chloroform-acetone and constituent binaries at 313.15 and 323.15 K was presented.