Showing papers by "Wrocław University of Technology published in 1982"
TL;DR: In this paper, three classes of listeners were utilized: a group of individuals who knew the talkers, a group that did not know the talker but were trained to identify them, and a non-English speaking group that neither knew the speaker nor understood the language spoken.
71 citations
TL;DR: A theorem equivalent to the Ford and Fulkerson one concerning the classic task of maximum flow is proved and an algorithm for searching maximum flow assuming integer values of flows on network arcs is presented.
64 citations
TL;DR: In this paper, the electrical conductivity of a d.c. reactive ion sputtering of a copper target in gaseous atmospheres with oxygen contents ranging from 0% to 50% was determined by X-ray analysis.
40 citations
TL;DR: The results of an experimental study of solid-liquid fluidized bed expansion are reported in this paper, where the correlational equation ϵ = (F D /F G ) 0,209 obtained in the paper is found to be in agreement with both the Richardson-Zaki equation as well as with the equation of Todes et al.
35 citations
01 May 1982
TL;DR: In this article, the transition from the oscillatory state to the stationary state can occur by four types of bifurcation, which can be distinguished experimentally, and the bifurbation diagrams for the systems mentioned have been determined.
Abstract: The systems Mn 2+ -malic acid-H 2 SO 4 -KBrO 3 and Mn 2+ -citric acid-H 2 SO 4 -KBr-O 3 have been studied in a stirred tank reactor. Transitions from the oscillatory state to the stationary state can occur by four types of bifurcation. All these types can be distinguished experimentally. The bifurcation diagrams for the systems mentioned have been determined.
33 citations
TL;DR: To physically implement the generalized differentiation a coherent processing system with binary synthetic filter was used and models of the 1-D and 2-D binary filters and results of the filtering process are shown.
Abstract: This paper gives the definition and examples of an arbitrary order differentiation based on some properties of the Fourier transform. To physically implement the generalized differentiation a coherent processing system with binary synthetic filter was used. The experimental part of the paper shows models of the 1-D and 2-D binary filters and results of the filtering process.
32 citations
TL;DR: On the basis of the Heisenberg equation of motion and the Linderberg-Seamans approximations, useful formulas for, β-resonance integrals in the all-valence NDO-like semi-empirical methods have been derived as mentioned in this paper.
Abstract: On the basis of the Heisenberg equation of motion and the Linderberg–Seamans approximations, useful formulas for, β-resonance integrals in the all-valence NDO-like semiempirical methods have been derived. The case of s, p, d basis sets of atomic orbitals has been considered.
29 citations
TL;DR: In this article, the shape of the liquidus lines in phase diagrams of binary systems with CT interaction formed by 2,4,7-trinitrofluoren-9-one (TNF) with six aromatic and heteroaromatic compounds has been calculated by a procedure based on the Van Laar equation.
28 citations
TL;DR: This chapter discusses the comparison of the strength of global and local choice principles, as well as possible shapes of proper classes, related to the unions of ZF − -model.
Abstract: Publisher Summary This chapter focuses on the extension of ZF − -set theory. It discusses the comparison of the strength of global and local choice principles, as well as possible shapes of proper classes. The chapter also discusses the constructions and the formulation of general principles related to the unions of ZF − -model.
24 citations
01 Jan 1982
TL;DR: In this article, the permutation flow shop problem is formulated as follows: each job has to be processed on m machines M 1, M 2, M 3 in order to minimize the time required to complete all jobs.
Abstract: The general flow — shop problem indicated by n|m|F|Cmax, can be formulated as follows. Each of n jobs J,…,Jn has to be processed on m machines M1,…,Mm in that order. Job Jj, j=1,…,n, thus consists of a sequence of m operations oj1..,,…,0. jm0jk corresponds to the processing of Jj on Mk during a processing time Pjk We want to find a processing order on each machine Mk such that the time required to complete all jobs is minimized. If the processing order is assumed to be the same on each machine, the resulting problem is called the permutation flow — shop problem, and indicated by n|m|F|Cmax.
24 citations
18 May 1982
TL;DR: Two major conclusions have been established: Reaction of the fixation reagents with the membrane is selective and the lipid-protein interactions change after pretreatment by OsO4 or glutaraldehyde.
TL;DR: In this paper, the mechanism of friction between polyoxymethylene and steel was investigated and the coefficient of friction was determined, and the effects of the hardness of the steel, the roughness of the sliding surface, the temperature, the relative sliding velocity and the contact pressure were examined.
TL;DR: The underlying notions are presented, and the proposed measures of similarity between Boolean search request formulations are justified and illustrated by examples, and some experimental results concerning the suggested similarity measures are given.
Abstract: The aim of this article is to propose a means of determining the similarity between search request formulations, which are Boolean combinations of descriptors. The similarity measures introduced can be used to cluster Boolean search request formulations. The search request formulation clusters can in turn be utilized in methods for clustering document representations. The initiation of the work on the methodology for determining similarity measures for Boolean search request formulations has been encouraged by hitherto performed experimental research into information retrieval systems with search request formulations in the form of sets of certain descriptors, i.e., in the same form as document representations. These experiments have shown a preponderance of those methods for clustering document representations that use previously formed clusters of search request formulations. We can expect that by using the proposed methodology for determining the similarity between Boolean combinations of descriptors, we might obtain similar results for the case of Boolean search request formulations. The introductory part of the article provides the background for undertaking the research reported. The underlying notions are then presented, and the proposed measures of similarity between Boolean search request formulations are justified and illustrated by examples. In addition, some experimental results concerning the suggested similarity measures are given.
TL;DR: In this paper, the methode de Galerkin is used to etudier la convection tridimensionnelle dans un cube. But this methode is not suitable for convection in a cube.
Abstract: Etude des conditions dans lesquelles apparait la transition d'un ecoulement laminaire a un ecoulement fluctuant. On utilise la methode de Galerkin pour etudier la convection tridimensionnelle dans un cube
TL;DR: In this paper, a new model for mass transfer through liquid membranes is presented, based on the assumption of a very fast chemical reaction, taking place inside droplets encapsulated within a liquid membrane and it permits the evaluation of mass transport kinetics.
TL;DR: In this paper, an isotropic three-level Kane band model has been used to interpret the experimental data, modified by introducing the light-hole level split from the heavy-hole levels due to the tetragonal crystal field.
TL;DR: In this article, a high-volatile bituminous coal was extracted with toluene in a high pressure system at temperatures ranging from 473 K to 713 K. At each temperature studied, a second order equation, with respect to undissolved but potentially extractable coal, closely fits the experimental time dependence of extraction yield.
TL;DR: A nonparametric procedure using the multiple Fourier series for Bayes risk consistency is presented and examined and the rates at which the probability of misclassification converges to the Bayes probability of error are presented.
TL;DR: The chemical structure of the sydnone ring O(1)-N(2), N(3), C(4)-C(5) was discussed in this article using X-ray structural data and results obtained by the INDO method.
TL;DR: The heat capacities of diphenyl, p-terphenyl and p-quaterphenyl from 180 K to their melting points were measured with a Perkin-Elmer DSC 1B scanning calorimeter as mentioned in this paper.
Abstract: The heat capacities of diphenyl,p-terphenyl andp-quaterphenyl from 180 K to their melting points were measured with a Perkin-Elmer DSC 1B scanning calorimeter Anomalies were observed in the heat capacity curves forp-terphenyl (from 400 K to the melting point) andp-quaterphenyl (from 190 to 260 K, and from 450 to 540 K) It is assumed that the anomalies near the melting points of the compounds under consideration could be related both to modification of the motion of the phenyl rings (external or/and internal) and to change in the motion of the molecules as a whole (diffusion phase)
TL;DR: In this article, the polarized Raman spectra of meta-nitroaniline single crystals in the 10−150 cm−1 region as well as the far-infrared spectrum of the (010) platelets in the 20−200 cm− 1 region have been measured and assignments of all expected bands have been proposed on the basis of the observed polarizations.
Abstract: The polarized Raman spectra of meta-nitroaniline single crystals in the 10–150 cm−1 region as well as the far-infrared spectra of the (010) platelets in the 20–200 cm−1 region have been measured and assignments of all expected bands have been proposed on the basis of the observed polarizations. To estimate the influence of the electrooptical properties of the crystal on the lattice spectra, the relative intensities of librational bands have been calculated from the oriented gas model, and observed discrepancies have been discussed. Comparisons with the spectra of the isomeric crystal p-nitroaniline and of a similar non-centrosymmetric crystal m-chloronitrobenzene have been made.
TL;DR: In this paper, the effect of time, temperature, the concentration of initiator and emulsifier, and the ratio of starting polymer to monomer on the degree of conversion (MC) of styrene and the grafting efficiency (GE) of polystyrene has been investigated.
TL;DR: The mechanism of the reactions taking place in the heterogeneous system: synthetic polydispersive Cu 2 S-ethylediaminetetraacetic acid (EDTA)-O 2 H 2 O has been investigated in this paper.
TL;DR: The influence of the incidence angle on alumina surface cleanness, roughness and topography was investigated in this article, where polycrystalline ceramic specimens of 96% sintered alumina and mechanically polished 99.5% alumina were bombarded by Aru ions at an applied voltage of 7 kV at various incident angles from 0 to 1.4 rad (0 to 80°) and at a beam current of about 70 μA.
Abstract: Polycrystalline ceramic specimens of 96% sintered alumina and mechanically polished 99.5% alumina were bombarded by Aru ions at an applied voltage of 7 kV at various incident angles from 0 to 1.4 rad (0 to 80°) and at a beam current of about 70 μA. The influence of the incidence angle on alumina surface cleanness, roughness and topography was investigated.
TL;DR: In this paper, the authors studied the properties of weak base membranes with diethylamine groups, obtained by chemical and physical modification of the polyethylene/poly(styrene-co-divinylbenzene) system (PE/poly (St-Co-DVB)) and found that the properties depend on the kind of the inert diluent used during interpenetration.
Abstract: Changes in the properties of weak base membranes with diethylamine groups, obtained by chemical and physical modification of the polyethylene/poly(styrene-co-divinylbenzene) system (PE/poly(St-co-DVB)) have been studied. The chemical modification was effected by interpenetrating of St and DVB in the presence of toluene or iso-octane inside the PE/poly(St-co-DVB) system (IPN system). It has been found that the properties of thus obtained membranes depend on the kind of the inert diluent used during interpenetration. The IPN systems have made it possible to obtain membranes possessing very good transport properties toward strong mineral acids. The physical modification of the PE/poly(St-co-DVB) system through an expanding process does not bring about any chemical and mechanical destruction of the membrane material, but the transport properties are markedly improved by such an operation. The strongest effect of that kind was exhibited by membranes obtained from sol-type copolymer St and DVB.
Es wurden die Eigenschaftsanderungen von schwach basischen Membranen mit Diethylamingruppen bestimmt, die durch chemische und physikalische Modifizierung des Systems Polyethylen/Poly(Styrol-co-Divinylbenzol) (PE/Poly(St-co-DVB)) erhalten worden sind. Die chemische Modifizierung bestand in der Interpenetration von St und DVB im System PE/Poly(St-co-DVB) (IPN-System) in Anwesenheit von Toluol oder Isooctan. Es wurde festgestellt, das die Eigenschaften der so erhaltenen Membranen von der Art des warend der Interpenetration verwendeten inerten Losungsmittels abhangen. Die Struktur der IPN-Systeme ermoglicht es, Membranen mit sehr guten Transporteigenschaften gegenuber starken Mineralsauren zu erhalten. Die physikalische Modifizierung des Systems PE/Poly(St-co-DVB) durch Expandieren verbessert die Transporteigenschaften der Membranen, ohne dabei chemische und mechanische Beschadigung zu verursachen.
TL;DR: In this paper, a simple procedure for the determination of solidus and liquidus temperatures from DSC data is proposed, based on O'Neill's model, and an expression for the melting interval of solid solutions, ΔT, has been derived.
Abstract: A Perkin-Elmer 1B DSC apparatus was used to test the O'Neill expression for the melting interval of pure compounds on samples of organic compounds 1–10 mg in weight. On the basis of O'Neill's model, an expression for the melting interval of solid solutions,ΔT, has been derived. The difference betweenΔT andT1− Ts (T1 andTs = =liquidus and solidus temperatures) is discussed. A simple procedure for the determination of solidus and liquidus temperatures from DSC data is proposed.
TL;DR: In this article, a second-order (ABX) NMR spectrum was obtained for a given 13C NMR signal at high magnetic fields, where the double bonds of the 31P nuclei were assumed to be doublets of doublets and thus constitute X in an AMX spectrum.
Abstract: The easily obtained dimers of phosphole oxides, sulfides and methiodides give 13C NMR spectra where carbons within three (sometimes four) bonds of each 31P nucleus are doublets of doublets and thus constitute X in an AMX spectrum. Most of the spectra have been completely interpreted with the aid of spectral measurements at two magnetic fields. Saturation of the double bonds in dimers of methylphosphole–P(IV) derivatives causes the 31P nuclei to have very similar chemical shifts, with Δν not adequately different from 3J(PP) to give first-order coupling. When both 31P nuclei couple with a given 13C, a second-order (ABX) 31C NMR spectrum is obtained. The presence of the effect is revealed by running the 13C NMR spectra at high magnetic field; J(AX)+J(BX) is constant at all fields, but spacing between the lines of the multiplet varies. The spectrum of the oxide, with Δν/J=1.44 for the 31P spectrum at 36.43 MHz, approaches first order character at 75 MHz; the methiodide spectrum (Δν/J=4.55) is second order at 15 MHz but clearly first order at 50 MHz, and the sulfide (Δν/J=5.6) is nearly first order at 15 MHz. [2 + 2]-Photochemical intramolecular cyclization of the dimer oxides provides cage-like structures where the 31P nuclei are chemically equivalent, but magnetically non-equivalent, making the 13C signals have the characteristics of X in an AA′X coupling pattern.