Showing papers by "University of Warsaw published in 1981"
TL;DR: In this paper, a general coupled-cluster method valid for arbitrary multideterminantal reference states is formulated and the resulting cluster expansion for the wave function is a generalization of that introduced by Silverstone and Sinano and applied by Sinano\ifmmode \check{g}else \v{g}\fi{}lu and collaborators.
Abstract: A general coupled-cluster method valid for arbitrary multideterminantal reference states is formulated. The resulting cluster expansion for the wave function is a generalization of that introduced by Silverstone and Sinano\ifmmode \check{g}\else \v{g}\fi{}lu and applied by Sinano\ifmmode \check{g}\else \v{g}\fi{}lu and collaborators. The connected nature of the cluster operators and the effective interaction is proven in the case when the reference space is complete, i.e., is invariant under unitary transformations of partly occupied orbitals. For incomplete reference spaces the disconnected terms appearing in the effective interaction are properly generated by the coupled-cluster theory. Approximate schemes for solving coupled-cluster equations are proposed and their relation with perturbation theory is briefly discussed.
776 citations
TL;DR: In this paper, the authors present a legal opinion on the applicability of commercial and impression systématiques in the context of the Copyright Agreement of the Publications Mathématique de l'I.H.É.S.
Abstract: © Publications mathématiques de l’I.H.É.S., 1981, tous droits réservés. L’accès aux archives de la revue « Publications mathématiques de l’I.H.É.S. » (http:// www.ihes.fr/IHES/Publications/Publications.html) implique l’accord avec les conditions générales d’utilisation (http://www.numdam.org/legal.php). Toute utilisation commerciale ou impression systématique est constitutive d’une infraction pénale. Toute copie ou impression de ce fichier doit contenir la présente mention de copyright.
294 citations
TL;DR: In this paper, a high-efficiency transistor tuned power oscillator based on the class E power amplifier is presented, which is especially applicable at high frequencies because it minimizes the power dissipated during transistor off-to-on transition, even if the switching time is an appreciable fraction of the signal period.
Abstract: The class E high-efficiency transistor tuned power oscillator, based on the class E power amplifier, is presented. Theoretical conditions for optimum operation of the oscillator are formulated. A new feedback-loop circuit is proposed and a corresponding oscillator design procedure is given. Experimental results show that the collector-voltage and collector-current waveforms and the collector efficiency of the oscillator are the same as in the class E amplifier with the same transistor and operating at the same frequency. The measured collector efficiency was over 95 percent with 3 W output at 2 MHz. The proposed oscillator is especially applicable at high frequencies because it minimizes the power dissipated during the transistor off-to-on transition, even if the switching time is an appreciable fraction of the signal period.
124 citations
TL;DR: In this paper, a parametrization of the spin-orbit part of the Woods-Saxon potential was optimized taking into account the single-particle energies corrected for nucleon-nucleus interaction and the high-spin spectra of the lead region nuclei.
Abstract: The parametrization of the spin-orbit part of the Woods-Saxon potential was optimized taking into account the single-particle energies corrected for nucleon-nucleus interaction and the high-spin spectra of $^{204}\mathrm{Pb}$ and $^{212}\mathrm{Rn}$. With the spin-orbit potential strength parameters $\ensuremath{\lambda}=36.0$ and the radius parameter ${({r}_{0})}_{\mathrm{so}}=1.3$ fm for both protons and neutrons, both types of empirical data are reproduced well. The configurations of the calculated high-spin states are identical with the shell-model results.NUCLEAR STRUCTURE Woods-Saxon single-particle levels, high-spin excitations, lead region nuclei.
113 citations
TL;DR: In this paper, the authors present a legal opinion on the applicability of commercial and impression systématiques in the context of the Copyright Agreement of the Publications Mathématique de l'I.H.É.S.
Abstract: © Publications mathématiques de l’I.H.É.S., 1981, tous droits réservés. L’accès aux archives de la revue « Publications mathématiques de l’I.H.É.S. » (http:// www.ihes.fr/IHES/Publications/Publications.html) implique l’accord avec les conditions générales d’utilisation (http://www.numdam.org/legal.php). Toute utilisation commerciale ou impression systématique est constitutive d’une infraction pénale. Toute copie ou impression de ce fichier doit contenir la présente mention de copyright.
80 citations
70 citations
TL;DR: In this paper, the double layer region of the electrode potentials was investigated for the adsorption of acetic acid on platinum, gold and rhodium electrodes from aqueous electrolytes.
63 citations
TL;DR: In this paper, a method for obtaining boson expansion by representing the fermion states as holomorphic functions of many complex variables is presented, which is explicitly constructed for each space which is the carrier space of an irreducible representation of a semisimple compact Lie group.
58 citations
TL;DR: It is reported here that nuclei from trophoblast and inner cell mass are different from one another, as judged by the developmental fate of fertilized mouse eggs to which they are transplanted.
Abstract: When nuclei from 12–18-cell mouse embryos have been injected into fertilized mouse eggs1,2, donor and host chromosomes in those eggs that survived the operation combined to form a single tetraploid nucleus. Some of the resulting embryos developed into morphologically normal blas-tocysts. At the 8-cell stage, mouse blastomeres are still totipotent3 and are indistinguishable from one another. By the blastocyst stage, inner cell mass and trophectoderm have separated into distinct cell lineages that differ in morphology, physiology4 and biochemistry5. The fetus develops entirely from inner cell mass while the trophectoderm contributes only to placenta and fetal membranes; it is unclear when this is determined. Aggregation experiments suggest that some blastomeres are still labile at the late morula/early blastocyst stage6,7. If this was the case at least some of the donor cells used in my previous nuclear transfers might have been still totipotent. However I report here that nuclei from trophoblast and inner cell mass are different from one another, as judged by the developmental fate of fertilized mouse eggs to which they are transplanted.
57 citations
TL;DR: In this article, the authors present the prescription for calculating the jet calculus vertices to higher orders, and give complete results for the quark decay probabilities in the next-to-leading approximation.
57 citations
01 Jan 1981
TL;DR: A simple model of concurrent computations is presented in which disjoint instructions are executed concurrently by processors in a sufficiently large number under a shared memory environment.
Abstract: A simple model of concurrent computations is presented in which disjoint instructions /processes/ of program are executed concurrently by processors /in a sufficiently large number/ under a shared memory environment. The semantics of such a program specifies the tree of configuration sequences which are acceptable as possible computations of the program.
TL;DR: In this paper, the γ-rays following the β − decay of 224,226 Fr have been investigated by means of multispectrum analysis and γγ coincidence measurements using Ge(Li) spectrometers.
TL;DR: In this article, a one parameter family of piecewise linear measure preserving transformations of a torus which can be viewed as a perturbation of the twist mapping is introduced, and theorems on their ergodic properties for an infinite set of parameters are proved.
Abstract: A one parameter family of piecewise linear measure preserving transformations of a torus which can be viewed as a perturbation of the twist mapping is introduced. Theorems on their ergodic properties for an infinite set of parameters are proved. For some parameters coexistence of stochastic and integrable behaviour is obtained.
TL;DR: In this paper, it was shown that all the known boson expansions, as well as an infinite number of new ones, can be derived in a unified way in terms of the functional representation technique.
TL;DR: Inelastic interactions of 4 He nuclei at the incident momentum of 4.5 GeV/c )/nucleon with pure Li, C, Al, Cu and Pb targets were studied in the SKM-200 streamer chamber.
TL;DR: The reaction of FeCl 3 dissolved in dry nitromethane with polyacetylene, (CH) x, results in the formation of p-type conducting polymers ( σ = 780 ohm −1 cm −1 ) as discussed by the authors.
TL;DR: In this article, it is shown that the evolution of hadronic jets produced in hard processes can be studied in terms of a simple parton branching picture, beyond the leading log approximation of QCD.
TL;DR: In this article, the level structure of 128,130Xe has been studied in the (α, 2nγ) and (3He, 3nγ), reactions on enriched Te targets using in-beam γ-ray spectroscopic methods.
TL;DR: A detailed analysis of two euplanktonic populations carried out in the same period, 18 May–11 August, 1978, in two neighboring Mazurian lakes revealed different patterns of changes in population densities and significant differences in fecundity, age structure and mean sizes of individuals despite similar epilimnion temperatures.
Abstract: A detailed analysis of two euplanktonic populations carried out in the same period, 18 May–11 August, 1978, in two neighboring Mazurian lakes revealed different patterns of changes in population densities and significant differences in fecundity, age structure and mean sizes of individuals despite similar epilimnion temperatures in the lakes. Similar densities were maintained in both populations although food limitation was less important and predation more intense in one than in the other of the two lakes. The relative importance of food limitation and predation is discussed in lakes of low and high fertility. It is also suggested that both low food concentration and high selective predation pressure favors small clutch sizes in cladocerans.
TL;DR: In this paper, a diamagnetic inequality is used to extend beyond the dipole approximation an earlier result concerning the nonexistence of the superradiant phase transition, which is a result that was later extended to the case of a supernova.
Abstract: A diamagnetic inequality is used to extend beyond the dipole approximation an earlier result concerning the nonexistence of the superradiant phase transition.
TL;DR: In a drug study the application of the coefficients of the AR model as input parameters in the discriminant analysis, instead of arbitrary chosen frequency bands, brought a significant improvement in distinguishing the effects of the medication.
TL;DR: In this paper, it was shown that Snyder's eluant strength parameter e°, used in liquid-solid adsorption chromatography, can be well described by a complementary Lewis acid-base model for solute-solvent interactions: e°=0.152+0.859 · E N T + 0.332 · B KT with a correlation coefficient of r = 0.949 for 28 solvents.
TL;DR: The a.$m of this paper is to present a stable algorithm of ?nerging vectors of length m and n (m Q n) performirrg Q(m log(n/m + 1)) comparisons and Q((m + @) log m) assignments in O(log m) space.
TL;DR: Destruction of neurosecretory cells in the pars intercerebralis of the brain causes the loss of locomotor activity rhythms and creates hyperactivity.
Abstract: Destruction of neurosecretory cells in the pars intercerebralis of the brain causes the loss of locomotor activity rhythms and creates hyperactivity. When the brain is taken from a rhythmic cricket having both short‐period activity rhythm (S‐PAR) or long‐period activity rhythm (L‐PAR) and is implanted into the abdomen of such an arrhythmic recipient, it produces a characteristic locomotor activity rhythm of the host cricket. The implanted brain has an inhibitory effect on the locomotor activity of a hyperactive and arrhythmic recipient.
TL;DR: In this article, it was shown that the Einstein-Maxwell theory of interacting electromagnetism and gravitation can be derived from a first-order Lagrangian, depending on the electromagnetic field and on the curvature of a symmetric affine connection Γ on the space-time M. The Lagrangians of this type are calculated also for the Proca field, for a charged scalar field interacting with electromagnetic and gravity, and for a few other interesting physical theories.
Abstract: It is shown that the Einstein-Maxwell theory of interacting electromagnetism and gravitation, can be derived from a first-order Lagrangian, depending on the electromagnetic field and on the curvature of a symmetric affine connection Γ on the space-time M. The variation is taken with respect to the electromagnetic potential (a connection on a U(1) principal fiber bundle on M) and the ‘gravitational potential’ Γ (a connection on the GL(4, R) principal fiber bundle of frames on M). The metric tensor g does not appear in the Lagrangian, but it arises as a momentum canonically conjugated to Γ. The Lagrangians of this type are calculated also for the Proca field, for a charged scalar field interacting with electromagnetism and gravitation, and for a few other interesting physical theories.
TL;DR: In this paper, the adsorption of aliphatic nitriles (acetonitrile, propionitrile and butyronitrile) at the air-solution and the mercury/solution interface is compared by means of surface and interfacial tension, and of surface potential measurements.
TL;DR: In this article, the three-body non-additivity of the interaction energy for the equilateral triangle configuration of the Ne3 system has been calculated, using the counterpoise method within the SCF approach.
TL;DR: In this paper, the kinetics of deposition of Cu 2+ ion on the mercury electrode covered by monolayers of normal aliphatic alcohols containing from four to eight carbon atoms in the molecule were investigated.
TL;DR: In this article, the relativistic electron-positron gas propagators of one-particle propagators are systematically investigated and the Fourier-transforms of the Green's functions have been expressed in terms of the generalized spectral Lehmann representation and the second-order spectral functions of the photon and electron propagators have been found.
TL;DR: The level structure of 227Ra has been studied using the (n, γ), (d, p) and ( t, d) reactions and the β− decay of 227Fr as discussed by the authors.