Showing papers by "University of Warsaw published in 1982"
TL;DR: In this article, a large sample of opposite-sign dimuons, produced by the interaction of neutrinos and antineutrinos in iron, is analyzed to provide information on the strength and space-time structure of the charm-producing weak current.
Abstract: A large sample of opposite-sign dimuons, produced by the interaction of neutrinos and antineutrinos in iron, is analysed. The data agree very well with the hypothesis that the extra muon is the product of charm decay. They yield information on the strength and space-time structure of the charmproducing weak current. The strange-sea structure functionxs(x) is determined. The difference between neutrino and antineutrino dimuon production is analysed to provide a value of the Kobayashi-Maskawa weak mixing angleθ2.
158 citations
TL;DR: It is conjecture that there exists no polynomial-time algorithm for the linear inequalities problem in the real number model, and it is conjectured that linear inequalities are strictly harder than linear equalities in all ''reasonable'' models of computation.
153 citations
TL;DR: Synthesis of two compounds in which C-terminal methionine or leucine residues are replaced by a second active fragment of the enkephalin analogue are described, which are very potent inhibitor of electrically induced contractions of guinea-pig ileum and produces a strong analgesia when administered intraperitoneally in mice.
116 citations
TL;DR: An efficient algorithm for the solution of linear equations arising in a finite element method for the Dirichlet problem and the cost is proportional to N2log2N (N=1/h) where the cost of solving the capacitance matrix equations is N log2N on regular grids and N3/2log 2N on irregular ones.
Abstract: An efficient algorithm for the solution of linear equations arising in a finite element method for the Dirichlet problem is given. The cost of the algorithm is proportional toN 2log2 N (N=1/h) where the cost of solving the capacitance matrix equations isNlog2 N on regular grids andN 3/2log2 N on irregular ones.
106 citations
TL;DR: It is reported here that osmotically stable spherical cells of E. coli can also be produced by an increase in the level of PBP 5, a D-alanine carboxypeptidase3, and it is shown that these cells, and those produced by inactivation of P BP 2, have the same abnormality in the structure of the newly inserted murein.
Abstract: The characteristic shape of bacterial cells is maintained by the strength and form of the murein layer of the cell wall1. Thus, rod-shaped bacteria need to synthesize a rod-shaped murein. The shape of the murein may be determined by the properties of the penicillin-binding proteins (PBPs) that catalyse the insertion of murein precursors into the cell wall2. In Escherichia coli inhibition of PBPs produces characteristic effects on bacterial morphology. For example, inactivation of PBP 2 results in an inability to synthesize cylindrical murein during cell elongation and the growth of E. coli as spherical cells2. We report here that osmotically stable spherical cells of E. coli can also be produced by an increase in the level of PBP 5, a D-alanine carboxypeptidase3, and show that these cells, and those produced by inactivation of PBP 2, have the same abnormality in the structure of the newly inserted murein.
104 citations
100 citations
TL;DR: It is concluded that the study of whole-plant respiration masks differences in energy utilization between shoots and roots.
Abstract: Continuous measurements of CO2-evolution and dry matter accumulation were carried out on shoots and roots separately of intact Helianthus annuus L. cv. Autumn Beauty plants grown in nutrient solution at different root temperatures. The data were used to distinguish between growth and maintenance components of respiration. The maintenance and growth coefficients were higher in the root system than in the shoots. The overall efficiency of assimilate utilization was within the range reported in the literature. An increase in root temperature increased the maintenance part of root respiration and, to a lesser degree, also shoot maintenance respiration. Neither root nor shoot growth respiration coefficients were affected by root temperature. It is concluded that the study of whole-plant respiration masks differences in energy utilization between shoots and roots.
81 citations
TL;DR: The lower limit of linear response in flow-injection systems employing membrane and second-kind ion-selective electrodes as detectors depends on the dispersion in the system and is usually much worse than in batch measurements as mentioned in this paper.
80 citations
TL;DR: In this paper, the authors studied the problem of local decomposition of an n-dimensional analytic manifold into independent subsystems or a cascade of subsystems and gave necessary and sufficient conditions for the existence of such local decompositions in terms of Lie algebras generated by the system.
76 citations
TL;DR: In this paper, the second-order interference of pion pairs of equal charge is observed in good statistics samples of 16 GeV/c π+p and K−p interactions (2 × 106 and 106 pion pair combinations, respectively) and in a smaller sample of p p annihilations at rest.
67 citations
TL;DR: In this article, it was shown that the sets of periods of periodic points for continuous maps of an interval into itself can be characterized by a theorem of Sarkovskii, and the same theorem can be applied to the continuous map of degree one of a circle into itself.
Abstract: There is a theorem of Sarkovskii which characterizes the sets of periods of periodic points for continuous maps of an interval into itself. We give a similar characterization for continuous maps of degree one of a circle into itself.
TL;DR: DNA coding for ribosomal RNA in Aspergillus nidulans was found to consist of a unit 7.8 kb in size which is tandemly repeated in the genome and codes for 5.8S, 18S and 26S rRNA.
TL;DR: In this article, a static apparatus for the determination of total vapour pressure isotherms of mixtures is described, which works without a null manometer, and degassing of samples is done without freezing.
TL;DR: The results show that when the structure of an algorithm corresponds well to theructure of the computer, a close-to-linear speedup may be achieved.
Abstract: This paper presents results of experiments with parallel algorithms. Several versions of four different programs, each representing a class of applications, were tested. All the experiments were performed on Cm*,l a 50-processor computer with a hierarchical structure. The results show that when the structure of an algorithm corresponds well to the structure of the computer, a close-to-linear speedup may be achieved. An attempt was made to analyze the reference patterns and interprocess cooperation and their influence on the performance of the algorithms. Several still-open questions are formulated in the paper and some further research directions are suggested.
TL;DR: In this paper, it was shown that ferrocyanides, ferricyanides and cyanides are chemisorbed on platinized and smooth platinum electrodes, both in acidic and neutral electrolytes, and the surface bonding results from the double-donoring properties of CN− ligands which act as a bridged group of the end-on type species like Pt←N≡C−Fe(CN)5n−.
TL;DR: In this paper, the Woods-Saxon potential is employed to interpret the properties of single particle and high spin spectra of a single particle, and spin-orbit potential parameters are found which simultaneously reproduce the experimental yrast and yrare states up to $I\ensuremath{\sim}18$ and generate the proton single particle energy gap = 2.0$ MeV.
Abstract: The Woods-Saxon potential is employed to interpret the properties of single particle and high spin spectra of $^{146}\mathrm{Gd}$. Spin orbit potential parameters are found which simultaneously reproduce the experimental yrast and yrare states up to $I\ensuremath{\sim}18$ and generate the proton single particle energy gap ${\ensuremath{\delta}}_{p}=2.0$ MeV. The spin-orbit potential parameters obtained are nearly identical for neutrons and protons and are close to the parameter values obtained previously by optimizing the potential to high spin spectra in the vicinity of $^{208}\mathrm{Pb}$. Properties of the pairing correction method, the Bardeen-Cooper-Schrieffer approximation with blocking, and the particle number projection are discussed and illustrated. It is demonstrated that including the particle number projection term in the total energy formula improves considerably the average slope of the calculated yrast line. The possibility of the collective quadrupole vibrational states becoming yrast states is studied for $I\ensuremath{\gtrsim}7\ensuremath{\hbar}$ using the random phase approximation but only a rather weak effect of collectivity is found in the spin-range studied.NUCLEAR STRUCTURE $^{146}\mathrm{Gd}$; Woods-Saxon single-particle levels, high spin excitations. Collectivity in the high spin states, RPA.
TL;DR: In this article, the half-lives of the new neutron-rich isotopes 179 Yb, 181 Lu and 182 Lu are investigated. But the properties of the excited states of 181,182 Hf are discussed.
TL;DR: The limiting composition obtainable in the electrolysis can be expressed by the following formula: [CH(MCl4)0.05]x where M = FeAl as discussed by the authors.
TL;DR: In this article, conditions for the determination of traces of seIenium(IV) by cathodic stripping technique are described, and three procedures are given in which the troublesome splitting of the stripping peak is eliminated.
TL;DR: In this article, a detailed study has been made of the luminescence spectra of 3-β-d-ribofuranosyl-7-amino-pyrazolo(4,3-d)pyrimidine (formycin A), 3-propyl 7-aminopyrazolo (4, 3-d), and their various N-methyl derivatives, at room temperature and in methanol-water glasses at 77 K.
Abstract: — A detailed study has been made of the luminescence spectra of 3-β-d-ribofuranosyl-7-amino-pyrazolo(4,3-d)pyrimidine (formycin A), 3-propyl-7-aminopyrazolo(4,3-d)pyrimidine (7APP), and their various N-methyl derivatives, at room temperature and in methanol-water glasses at 77 K. Comparisons of the foregoing, together with the observed dependence of the emission spectra of formycin and 7APP on excitation wavelength, demonstrated that these consist of two tautomeric species, N(1)H and N(2)H, both of which emit at 300 and 77 K. The two tautomers may be distinguished by the location of the emission maxima, especially for phosphorescence, and quantum yields for emission.
Comparisons of the emission spectra of the protonated forms of 7APP and its N-methyl derivatives showed that the fluorescence of the cations of 7APP and its N,- and N2-methyl derivatives originates from the forms protonated on N(4). By contrast, the forms protonated on N(6) contribute appreciably to the phosphorescence at 77 K. On the basis of the emission spectra at 77 K, it is concluded that the major tautomeric form of the formycin cation is N(1)H,N(4)H+, but there is also some contribution by the form N(2)H,N(4)H+.
In acid medium at room temperature, there is photodissociation of a proton from the pyrazole ring of the formycin cation. This leads to formation in the state S! of the tautomeric species N(4)H, which does not exist in the ground state. This conclusion, similar to that previously reported for the analogous isomeric 4-aminopyrazolo(3,4-d)pyrimidines, is derived from a comparison of the fluorescence spectra of the cations of formycin and N4-methylformycin, which exhibit two bands at 375 and 440 nm, the latter corresponding to the emission of the neutral form of N,i-methylformycin. The proposed mechanism of phototautomerization is supported by a study of solvent and salt effects.
TL;DR: In this paper, the collisional processes that occur in alkali metal vapours upon illumination with a laser tuned to the first principal atomic transition, observed in experiments performed under various conditions, are discussed.
TL;DR: The reachability property for a pair of matrices (A, B) over the polynomial ring ℛ = R[d1..., dk] in k symbols with real coefficients is considered in this paper.
Abstract: The formal reachability property for a pair of matrices (A, B) over the polynomial ring ℛ = R[d1..., dk] in k symbols with real coefficients is considered where A is n by n, B is n by m with integers m being fixed. Reachability is defined as the property that ImRscr;[A|B]= ℛn n where [A |B] = [B, AB,..., A n−1B] is the formal reachability matrix for the pair (A, B). This abstract property is first characterized by a numerical rank criterion over the field of complex numbers. Then it is shown that reachability is generic if and only if k < m. It is hoped that the results presented will stimulate further research on polynomial output feedback controllers' for the delay-differential and multidiscrete-type systems.
TL;DR: In this paper, a connection between the Wigner distribution function and the time-dependent physical spectrum of light is made, which provides insight in the meaning of timedependent spectra and gives an intuitive understanding of the uncertainty of simultaneous time-frequency measurements.
TL;DR: The non-additive contribution to the exchange repulsion for the argon trimer in the equilateral-triangle configuration has been calculated in the first order of symmetry-adapted perturbation theory as mentioned in this paper.
TL;DR: In this paper, the authors define the discussed dimensions as temperament, to be understood as a product of biological evolution, shaped under the influence of the surroundings, in contradistinction to personality, which is treated by most psychologists as a result of interaction with the social environment.
TL;DR: In this paper, the 57 Fe Mossbauer resonance has been applied to study polyacetylene films doped chemically and electrochemically to different doping levels, leading to the insertion of a high spin Fe III complex with Mossbauber parameters characteristic of FeCl − 4.
TL;DR: In this article, the dispersion relations for the acoustic and optic phonons in HgTe and HgSe were determined by neutron inelastic scattering in three high symmetry directions.
Abstract: The dispersion relations for the acoustic and optic phonons in HgTe and for the acoustic phonons in HgSe were determined by neutron inelastic scattering in three high symmetry directions The effect of the free-carrier screening of the long-range electric field of LO phonons in HgTe was observed The formalism of the rigid ion model is used for numerical calculations of the phonon dispersion relations and the phonon densities of states in HgTe and HgSe
TL;DR: This paper is a description of the various decision situations that can arise whenever a system is under control of multiple decision units and makes reference to the existing theories and approaches that aim to describe the decision processes in such structures.
TL;DR: In this paper, the radicals of graded rings were studied in the context of algebraic geometry and they were shown to be radicals of a ring with respect to a ring-group.
Abstract: (1982). On radicals of graded rings. Communications in Algebra: Vol. 10, No. 17, pp. 1849-1854.