Showing papers by "Wrocław University of Technology published in 1988"
TL;DR: The highest lipase activity was found in Streptomyces sp.
173 citations
TL;DR: The suggested approach, which may be called Fuzzy-Numerical Simulation, allows for ascribing a precise numerical value to a fuzzy variable by generating a value of a random variable related in some way to the fuzzy variable.
137 citations
TL;DR: In this paper, the reduction of selenium with lithium in THF in the presence of diphenylacetylene as a catalyst afforded lithium diselenide, which reacted with electrophiles giving alkyl or aryl diselsenides 1 - 3 and selenides 4, as by-products.
120 citations
TL;DR: In this paper, the authors studied the behavior of the general nonparametric estimate for the unknown regression function g, where the weight function wni is of the form wni(x) = wni (x; xi(n), …, xn(n)).
89 citations
TL;DR: In this article, a semi-empirical all-valence method, GRINDOL (Ghost and Rydberg INDO), based on the INDO approximation, is described.
Abstract: A new semiempirical all-valence method, GRINDOL (Ghost and Rydberg INDO), based on the INDO approximation, is described. Linderberg–Seamans relation (extended to the d and Rydberg orbitals) for the resonance integrals and a new semitheoretical expression for the core-core repulsion term and energy correction including basis-set superposition error (intermolecular as well as intramolecular) has been applied. The proposed method enables calculation of ground and excited state properties. The ground state results (including intermolecular interactions) as well as the spectral properties are in reasonable agreement with relevant experimental (or ab initio) studies for isolated molecules, molecular complexes, and transition metal compounds. The method contains only one adjustable parameter, all two-center integrals and terms are only basis-set dependent. The one-center integrals are evaluated from the respective atomic terms.
85 citations
TL;DR: In this paper, the authors present the results of experimental studies on the venting of gaseous and dust explosions in a 22 1 spherical vessel connected to a duct, where the origin of the acoustic oscillations is not clear and their occurrence can be prevented by initial turbulence.
51 citations
TL;DR: It is shown that the decision form of this problem is NP-complete, even when the processing times on one machine only are controllable and all the processing cost units are identical.
47 citations
TL;DR: In this article, critical micelle concentrations and the changes in enthalpy, entropy, and free energy that accompany micelle formation of betaine chloride alkyl esters (of the general formula (CH3)3N+CH2COOCnH2n+1Cl−, where n = 10, 12, 14, 16) were determined by means of titration calorimetry in an aqueous solution at 298.16 K.
40 citations
TL;DR: In this paper, a non-permutation flow shop scheduling problem is studied, in which the duration of each operation on certain machines is a linear function of the allotted part of a constrained resource (e.g., energy, fuel, catalyzer, oxygen, raw material, money).
Abstract: The paper deals with a version of the general non-permutation flow-shop scheduling problem in which the duration of each operation on certain machines is a linear function of the allotted part of a constrained resource (e.g. energy, fuel, catalyzer, oxygen, raw material, money) and the objective is to determine both a sequence of the operations on each machine and an allocation of resource to each operation in order to minimize the over-all completion time. The algorithm for solving this problem is based on the disjunctive graph theory and branch and bound technique. Due to the present elimination properties, the search tree is strongly restricted. It applies a special system of fixing precedence relations in each node of the search tree yielding strong lower and upper bounds. To quickly obtain a strong upper bound a special heuristic method is used (to calculate a good initial solution) and the descendants in the search tree are chosen in order of the non-decreasing lower bounds. Some computational resul...
35 citations
TL;DR: It is shown that they oscillate with period equal to 2, which is an extension of the convergence property concerning max-min transitive fuzzy matrices.
35 citations
TL;DR: In this paper, l'activite lipolytique des microorganismes (bacteries, moisissures notamment) and la specificite des lipases vis-a-vis du substrat are discussed.
Abstract: Revue bibliographique sur l'activite lipolytique des microorganismes (bacteries, moisissures notamment) et la specificite des lipases vis-a-vis du substrat. Applications technologiques
TL;DR: In this article, conductive oxide powders (IrO2, RuO2 and Bi2Ru2O7) were prepared on alumina substrates by a thick-film technique and the films were fired at 875° C for different dwell times.
Abstract: Layers of conductive oxide powders (IrO2, RuO2 and Bi2Ru2O7) were prepared on alumina substrates by a thick-film technique. The films were fired at 875° C for different dwell times. The temperature dependence of resistance was measured in the range −196 to 850° C. SEM observations of the initial powders and the resistive layer surface after firing, as well as X-ray diffraction investigations, were carried out. The RuO2 and IrO2 oxides exhibit a high sintering ratio and the resistance of the fired layers increases with temperature as in the single crystal. The R(T) curve for Bi2Ru2O7 layers is in qualitative agreement with the polycrystalline material. The role of the grain surface area and the regions between the grains is dominant.
TL;DR: The ‘Linguistic Pattern’ approach to the facilities and panels layout is presented, based on Zadeh's possibility theory and the Lukasiewicz multivalued implication formula.
Abstract: The ‘Linguistic Pattern’ approach to the facilities and panels layout is presented. This approach is based on Zadeh's possibility theory and the Lukasiewicz multivalued implication formula. The idea of the approach is presented on the basis of a simple exemplary problem of an automobile display arrangement. The general idea of a computer algorithm is presented and some potential benefits of the proposed approach are discussed.
TL;DR: The electrical properties of Ti-Si-N films deposited in a triode sputtering system with a hot cathode are presented in this paper, where the process conditions were selected so as to obtain a mixture of Si 3 N 4 -TiN as a result of reactive sputtering.
TL;DR: In this paper, the problem of dynamic non-linear response of a suspension bridge to the passage of a train of concentrated forces with random weight is considered, and a numerical technique is developed to compute the solution for a particular bridge and some practical cases of the loading.
TL;DR: An optimal medium for lipolytic productivity of selected bacterial strains contains soybean meal as the nitrogen source and soluble starch, or sucrose or maltose as a carbon source.
Abstract: An optimal medium for lipolytic productivity of selected bacterial strains contains soybean meal as the nitrogen source and soluble starch, or sucrose or maltose as a carbon source. The temperature of 42°C and pH 8.6 were in general the most suitable for lipolytic productivity but 22°C and pH 8.6 were the optimum temperature for the production of lipase byPs. fluorescens.
TL;DR: In this paper, a phenomenological theory of improper ferroelastic phase transition, that superionic hydrogen-bonded Rb3H(SeO4)2, crystals undergo at Tc = 447 K, is presented.
Abstract: A phenomenological theory of improper ferroelastic Phase Transition, that superionic hydrogen-bonded Rb3H(SeO4)2, crystals undergo at Tc = 447 K, is presented. The temperature dependences of components of the spontaneous deformation tensor, elastic coefficient tensor, and electric conductivity in the vicinity of phase transition are calculated. A possible microscopic model of order–disorder type of the phase transition in the proton subsystem is discussed briefly.
[Russian Text Ignored].
TL;DR: Seventeen derivatives of 1-amino-1-methylethylphosphonic acid were synthesised and evaluated for plant-growth-regulating activity using Cucumis sativus and Triticum aestivum.
Abstract: Seventeen derivatives of 1-amino-1-methylethylphosphonic acid were synthesised and evaluated for plant-growth-regulating activity using Cucumis sativus and Triticum aestivum. The tested compounds exerted either moderate herbicidal action or stimulated plant growth. The structure-activity relationships were similar to those observed earlier for the derivatives of 9-aminofluoren-9-ylphosphonic acids (phosphonic analogues of morphactins).
TL;DR: Juvenile hormone binding proteins (JHBP) have been detected in cytosol of larval and pupal epidermis of Galleria mellonella as discussed by the authors.
15 Apr 1988
TL;DR: In this paper, it was concluded from the linkage of the theory of the nonlinear electrooptic properties (NEP) with the vibronic theories of IR and Raman intensities that a relation between the IR spectra and the NEP of aromatic crystals must exist.
Abstract: It is concluded from the linkage of the theory of the nonlinear electrooptic properties (NEP) with the vibronic theories of IR and Raman intensities that a relation between the IR spectra and the NEP of aromatic crystals must exist. Reanalysis of metanitroaniline( m -NA) spec detection of vibronic couplings in vibrational spectra has been proposed. It seems that the stronger couplings in non-centrosymmetriccrystals correspon
TL;DR: In this paper, a group of chemodegradable surfactants which readily hydrolyze and oxidize in natural water reservoirs were derived, based on acid-catalyzed reactions of long chain aliphatic aldehydes (I) with 1,1,1-tris(hydroxymethyl)propane (II), 2-alkyl-5-hydroxmethyl-5,ethyl-1,3-dioxanes (III) and cyclic cyclic acetal derivatives (IV) were obtained.
Abstract: In acid-catalyzed reactions of long chain aliphatic aldehydes (I) (R=n−C7H15; n−C9H19; n−C11H23) with 1,1,1-tris(hydroxymethyl)propane (II), 2-alkyl-5-hydroxymethyl-5-ethyl-1,3-dioxanes (III) were obtained. The latter were then reacted with ethylene oxide in the presence of sodium methoxide. Three series of oxyethylenated cyclic acetal derivatives (IV) were obtained. They constitute a new group of chemodegradable surfactants which readily hydrolyze and oxidize in natural water reservoirs. Physical data of the new compounds and some surface properties such as cloud points (Cp), critical micelle concentrations (cmc), changes of free energy of micellization, (ΔG°cmc), surface tensions of aqueous solutions near cmc, γmin, and wetting and foaming properties, were determined. The surfactants (IV) have aqueous solution properties similar to those of oxyethylenated longchain aliphatic alcohols. It is shown that the micellization of surfactants (IV), expressed in terms of ΔG°cmc, depends both on the length of the aliphatic chain at the C-2 carbon atom and on the presence of ethyl group at C-5 of 1,3-dioxane ring which enhances the hydrophobic character of derivatives (III). Hence, the surfactants have a higher surface activity than oxyethylenated 2-alkyl-4-hydroxymethyl-1,3-dioxolanes or 2-alkyl-5,5-bis-(hydroxymethyl)-1,3-dioxanes. The use of 2-alkyl-5-hydroxymethyl-5-ethyl-1,3-dioxanes (III) in surfactant synthesis is an example of applying hydrophobic intermediates obtained from aldehydes only. This, and the chemodegradability mentioned make the compounds a very interesting group of new surfactants.
TL;DR: In this article, 1,4-dimethoxyarenes bearing oxaziridinyl substituents were converted into corresponding quinones with silver(II) dipicolinate.
TL;DR: In this paper, a series of terpolymers were prepared from acrylonitrile, ethyl or butyl acrylate and divinylbenzene (10 wt).
TL;DR: In this article, the optical spectra of Zn 3 P 2 in the far infrared region (40-700cm -1 ) have been measured at room temperature and at 8K.
TL;DR: In this paper, the I-V and C −2 -V characteristics of Cd-doped Mg-Zn 3 P 2 diodes with Au ohmic back contacts have been investigated experimentally.
Abstract: Cd-doped Mg-Zn 3 P 2 diodes with Au ohmic back contacts have been investigated experimentally. The I-V and C −2 - V characteristics have been interpreted by taking into account an interfacial layer with states in equilibrium with the semiconductor.
Journal Article•
TL;DR: In this paper, the classical theoretical problem of thermal ignition and extinction in a reactive slab of infinite extent under conditions near transition to continuous behavior is revisited, where the system is governed by two parameters: the Frank-Kamenetskii parameter and the dimensionless adiabatic temperature rise.
Abstract: The classical theoretical problem of thermal ignition and extinction in a reactive slab of infinite extent under conditions near transition to continuous behaviour is revisited. It is assumed that the system is governed by two parameters. The first corresponds to the Frank-Kamenetskii parameter, $\delta$; the second is in some circumstances related to the dimensionless ambient temperature of inverse activation energy ($\beta = RT \_a/E$) and in other circumstances to the dimensionless adiabatic temperature rise ($\theta\_{ad}$ or B). The value of the second parameter ($\beta$ or B) is assumed to be close to its transition value, where a `cuspoidal' behaviour of the reacting system appears. A perturbation analysis of the problem shows that additional, spatially distributed states exist in the system in the form of travelling waves of reaction. One of the newly discovered solutions is stable and corresponds to the one-dimensional combustion wave. The second solution is unstable and cannot be related to a real physical situation.