Showing papers by "University of Warsaw published in 1968"
TL;DR: Theoretical calculations of the potential energy surface as a function of quadrupole and hexadecapole distortion parameters are reported for super-heavy nuclei with Z near 114 and N near 184 as mentioned in this paper.
194 citations
TL;DR: In this paper, a realistic interpretation of quantum logic is presented, where the propositions are interpreted as corresponding to macroscopic objects called filters; these objects are used to select beams of particles.
Abstract: In the first part of this work, an attempt of a realistic interpretation ofquantum logic is presented. Propositions of quantum logic are interpreted as corresponding to certain macroscopic objects called filters; these objects are used to select beams of particles. The problem of representing the propositions as projectors in a Hilbert space is considered and the classical approach to this question due to Birkhoff and von Neumann is criticized as neglecting certain physically important properties of filters. A new approach to this problem is proposed.
148 citations
TL;DR: In this paper, the binding energies of light hypernuclei were studied based on a sample of 2008 uniquely identified π − mesonic decays. And the problems of the calibration procedure and the selection criteria are discussed.
79 citations
TL;DR: In this paper, the energy of nuclear matter in the range of 0 to 0.60 was determined for superheavy nuclei and to problems of astrophysical interest, and the results were applicable to super heavy nuclei.
Abstract: The energy of nuclear matter is determined for $\ensuremath{\alpha}=\frac{(N\ensuremath{-}Z)}{(N+Z)}$ in the range of 0 to 0.60. The results are applicable to superheavy nuclei and to problems of astrophysical interest.
76 citations
TL;DR: In this article, the authors presented the formulae and results of calculations of the nuclear level density based on the theory of superconductivity, and compared the results with experimental level densities and nuclear temperatures for Co and In nuclei.
75 citations
TL;DR: True hermaphroditism in some of the animals obtained was also accepted as an indirect proof of chimerism but the postulate of these individuals being six-chromosome chimeras has not as yet been directly confirmed by karyological research.
Abstract: A considerable amount of information bearing upon mouse chimeras obtained experimentally by fusion of cleaving eggs has already been accumulated (Tarkowski, 1961, 1963, 1964 a , b , 1965; Mintz, 1962 a , b , 1964 a , b , 1965 a , b 1967). Direct and indisputable proofs of the chimerism of the individuals produced were obtained by establishing that two types of pigment cells were present in the outer layer of the retina (Tarkowski, 1963, 1964 a ) and in the coat (Mintz, 1965 a , b , 1967). The cell composition of other organs and tissues has not as yet been investigated. True hermaphroditism in some of the animals obtained was also accepted as an indirect proof of chimerism (Tarkowski, 1961, 1963, 1964 b ; Mintz, 1965 b ) but the postulate of these individuals being six-chromosome chimeras has not as yet been directly confirmed by karyological research.
74 citations
TL;DR: In this article, the isomeric ratios and excitation functions were measured for the 59 Co(n, 2n) 58 Co reaction in the neutron energy range 12 − 18 MeV and for the 58 Ni(n, p) 58 CO reaction in a neutron range 2 −18 MeV.
35 citations
TL;DR: The available evidence supports the hypothesis that in the egg follicle of Cecidomyiidae the growth regulation of nurse nuclei and, indirectly, also of whole nutritive chambers results from developmental interrelationships between the oocyte and the nutritive chamber, and that the oocytes plays a leading role in this process.
Abstract: InCecidomyiidae the number of trophocytes derived from the somatic tissue of the ovary and forming nutritive chambers of egg follicles is variable. The regulation of growth of the whole nutritive chambers and of the nurse nuclei was investigated in two species of the gall midges,Mikiola fagi andBoucheella artemisiae, at two different stages of the egg follicle development during the second period of the oocyte growth. The volume of a nutritive chamber is correlated with the size of the egg follicle as a whole and is not dependent on the number of nurse nuclei it contains. The total volume of nurse nuclei at each stage under investigation was found to have a constant value which is independent of their number. It was established that the growth of the nurse nuclei takes place through endomitosis, and that at a given stage of the egg follicle development the constant value of the total volume of the nurse nuclei reflects the constancy of degree of their total polyploidy. The results obtained indicate that at the early stages of the egg follicle development the rates of growth of the nurse nuclei and of the whole nutritive chambers in the egg follicles differing with respect to the number of their nurse nuclei must be different; the greater the number of nurse nuclei in a given nutritive chamber the slower the rate of growth of the chamber and their nuclei. As a result of this differential rate of growth the volumes of the nutritive chambers and total volumes of nurse nuclei reach at a certain stage of the egg follicle development certain values common for all egg follicles, irrespective of the number of the nurse nuclei they contain. Beginning with this stage the dependence between the endomitotic activity of the nurse nuclei and the rate of growth of the whole nutritive chamber on the one hand, and the number of the nurse nuclei in the chamber on the other, evidently disappears. The available evidence supports the hypothesis that in the egg follicle ofCecidomyiidae the growth regulation of nurse nuclei and, indirectly, also of whole nutritive chambers results from developmental interrelationships between the oocyte and the nutritive chamber, and that the oocyte plays a leading role in this process. In view of a syncytial character of the nutritive chambers inCecidomyiidae and distinctly expressed asynchrony of the growth-duplication cycles of nurse nuclei belonging to a given chamber it is concluded that the control mechanism for DNA synthesis and endomitosis in nurse nuclei must possess the property of a rapid switch. Processes of the growth regulation of the nurse nuclei are discussed in connection with the role of the nutritive chamber in production of RNA and its supply to the growing oocyte. It is suggested that in the egg follicles ofCecidomyiidae there exists a complex interrelationship between the control mechanism for DNA synthesis and endomitosis in the nurse nuclei and the synthetic processes regulated by the supply of the growing oocyte with RNA produced by the nuclei of the nutritive chamber.
27 citations
TL;DR: In this paper, the velocity and temperature distribution near a plane, vertical, isothermal surface are compared with theoretical predictions obtained from the solution of the differential equations for a semi-infinite vertical plate.
21 citations
TL;DR: This chapter focuses on formal logic and the development of knowledge, an abstract theory which does not consider non-formal or pragmatical aspects of human knowledge.
Abstract: Publisher Summary This chapter focuses on formal logic and the development of knowledge. Formal is a metatheory and is identical with the syntax and semantics of formalized languages. However, formal logic does not consider any pragmatical questions concerning language and thinking. A theory of knowledge and of its development built within formal logic is an abstraction. A diachronic formal logic helps in the development of knowledge. However, diachronic logic can only be simply an application of notions, theorems and methods used in synchronic logic to the problem of change in human knowledge. Diachronic logic provides only general information concerning the development of human knowledge. This is a simple consequence of the very nature of formal logic. Formal logic, synchronic or diachronic, is an abstract theory, which does not consider non-formal or pragmatical aspects of human knowledge.
19 citations
TL;DR: Theoretical calculations of nuclear deformed shell model equilibrium shapes in the rare earth and actinide regions have yielded hexadecapole distortions in good agreement with recent experimental shapes determined from (α, α′) scattering analysis as discussed by the authors.
TL;DR: Suggestive evidence for the extragonadal origin of germ cells in birds was presented by Swift (1914), who found that primordial germ cells later enter into the blood vessels, circulate together with the blood throughout the whole blastoderm and finally penetrate into the genital ridges, where they become definitive germ cells.
Abstract: Suggestive evidence for the extragonadal origin of germ cells in birds was first presented by Swift (1914), who described primordial germ cells in the chick embryo at as early a stage as the primitive streak. According to Swift, primordial germ cells are originally located extra-embryonically in the anterior part of the blastoderm and occupy a crescent-shaped region (‘germinal crescent’) on the boundary between area opaca and area pellucida. Swift also found that primordial germ cells later enter into the blood vessels, circulate together with the blood throughout the whole blastoderm and finally penetrate into the genital ridges, where they become definitive germ cells. Swift9s views have been confirmed in numerous descriptive and experimental investigations. Among the latter, the publications of Willier (1937), Simon (1960) and Dubois (1964 a , b , 1965 a , b , 1966) merit special attention. Dubois finally proved that the genital ridges exert a strong chemotactic influence on the primordial germ cells.
TL;DR: In this article, the Thomas-Hopfield model of the valence bands is verified and relations between the components of the deformation potential tensors are obtained, and the electron-phonon interaction term in dEg/dT at 300 and 77°K, respectively.
Abstract: The absorption edge, luminescence, and birefringence of CdSe single crystals under uniaxial stress are measured at 300 and 77°K. The Thomas-Hopfield model of the valence bands is verified. Some relations between the components of the deformation potential tensors are obtained. The electron–phonon interaction term in dEg/dT at 300 and 77°K, respectively. The stress depencence of the bound exciton luminescence line and absorption edge is found to be the same.
Es werden die Absorptionskante, die Lumineszenz und die Doppelbrechung von CdSe-Einkristallen unter einachsiger Spannung bei 300 und 77°K gemessen. Das Modell von Thomas und Hopfield fur die Valenzbander wird bestatigt. Es werden einige Beziehungen zwischen den Komponenten des Tensors des Deformationspotentials erhalten. Der Elektron-Phonon-Wechselwirkungsterm in dEg/dT wird bei 77 und 300°K bestimmt. Er betragt 96 bzw. 90% vom gesamten dEg/dT bei 300 bzw. 77°K. Die Spannungsabhangigkeit der Lumineszenzlinien der gebundenen Exzitonen und der Absorptionskante ist dieselbe.
TL;DR: In this paper, the small angle critical scattering of neutrons in iron was measured and the temperature shift of a maximum of scattered intensity has been discussed in the light of the latest theories.
TL;DR: The results are related to the photochemistry of thymidine and of bacteriophages containing incorporated 5-ethyluracil in place of thymine.
Abstract: Irradiation at 254 millimicrons transforms 5-ethyldeoxyuridine to deoxyuridine by way of photohydration of the 5,6 bond and elimination of ethanol. At wavelengths to the red side of 265 millimicrons, photodimerization is the principal reaction, with a pronounced oxygen effect. The results are related to the photochemistry of thymidine and of bacteriophages containing incorporated 5-ethyluracil in place of thymine.
TL;DR: In this article, the pairing force strength of nuclei varies proportionally to the magnitude of the nuclear surface, which may explain the increase in the energy gap of the fissioning nuclei at their saddle point.
TL;DR: The results suggest that the reversal of antimycin inhibition by diethyl ether extraction of inhibited preparation was due to the removal of the antibiotic from the site which was responsible for the inhibition of the electron transport chain.
TL;DR: In this paper, the real part of the forward p scattering amplitude is calculated and the results show that the energy dependence of the ratio Ref/Imf is in fact weaker than that obtained in earlier papers and also weaker than the analysis of Coulomb interference term.
Abstract: Dispersion relation calculations of the real part of the forward pp scattering amplitude are presented. The results show that the energy dependence of the ratio Ref/Imf is in fact weaker than that obtained in earlier papers and also weaker than that which follows from the analysis of Coulomb interference term. Results for\(p\bar p\) scattering are presented too, and these do not differ from what was known before.
TL;DR: In this article, the energy spectra of alpha particles from the 122 Te(n, α) 119 Sn, 159 Tb(n, α) 156 Eu and 169 Tm(n*, α) 166 Ho reactions at 14.2 MeV have been studied using the semiconductor detector technique.
TL;DR: In this paper, it was shown that secondary protons determine the general features of the pion distribution at 8 GeV/c in the reactions of π + +p→p+5 π and π+ +p →p+6 π.
TL;DR: In this paper, it was shown that the intersection of local Haag algebras assigned to open neighbourhoods of such a set contains only multiples of the identity of the set.
Abstract: It is shown for some class of sets in the Minkowski space that the intersection of local Haag algebras assigned to open neighbourhoods of such a set contains only multiples of the identity.
01 Jan 1968
TL;DR: A detailed overview of compact spaces can be found in this paper, where the authors present a theorem which states that if a compact space has a countable open base, then the family of sets that are simultaneously closed and open is countable.
Abstract: Publisher Summary
This chapter provides an overview of compact spaces. A topological space is called compact if it satisfies the Borel-Lebesgue condition, that is, every open cover contains a finite subcover. Classical examples of compact spaces are: the interval, the cube, and any closed and bounded subset of the euclidean space. The chapter presents a theorem which states that if a compact space has a countable open base, then the family of sets that are simultaneously closed and open is countable. A space is called dyadic if it is a continuous image of a generalized Cantor discontinuum Dm—where D is the two-element set (0,1). The chapter also discusses dimensional kernel of a compact space and transformations with k-dimensional point inverses.
TL;DR: Dans certaines populations deOpalina ranarum nous avons trouvé d'importantes différences dans la grandeur des noyaux dans le degré de polyploïdisation.
Abstract: Dans certaines populations deOpalina ranarum nous avons trouve d'importantes differences dans la grandeur des noyaux Ces differences tiennent au degre de polyploidisation Les grands polyploides conservent la faculte de se diviser par mitose
01 Jan 1968
TL;DR: The concept of homomorphism was introduced in this paper, where it was shown that for a homomorphic group to be an isomorphism, it is necessary and sufficient that it be one-to-one, that is, its kernel shall reduce to the element 0.
Abstract: Publisher Summary
This chapter discusses general properties of commutative groups. The chapter presents the concept of homomorphism. In order that a homomorphism be an isomorphism, it is necessary and sufficient that it be one-to-one, that is, that its kernel shall reduce to the element 0. From the group-theoretical point of view two isomorphic groups cannot be distinguished—such as from the topological point of view no two homeomorphic spaces can be distinguished. The chapter also discusses relations between factor groups and relations to connectedness.
TL;DR: In this paper, the triton binding energy was calculated using a separable nucleon-nucleon potential with hard shell repulsion in the singlet state and with tensor force.
TL;DR: In this paper, it was shown that the non-keplerian character of the rotation of the ring of gas particles in a close binary system gives too large an amplitude of the radial velocity curve if this amplitude is determined from the positions of the emission lines.
Abstract: It is shown that the non-keplerian character of the rotation of the ring of gas particles in a close binary system gives too large an amplitude of the radial velocity curve if this amplitude is determined from the positions of the emission lines of the ring.