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  • 1
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 595-598 (Sept. 2008), p. 559-570 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Two experimental loops for operation in research reactor LVR-15 in ÚJV Řež arerecently under preparation: High Temperature Helium Loop (HTHL) and SuperCritical Water Loop(SCWL). Pure helium will be used as working medium in HTHL and its main physical parametersare: operating pressure 7MPa, max. temperature in the test section 900C and flow rate 36kg/h.HTHL will include helium purification system, system for dosage of impurities (e.g. CO2, H2, H2O,O2, N2 etc.) and helium sampling. Helium purification experiments and testing of materials insimulated HTR conditions will take place in HTHL in the future. Main parameters of the SCWL are25MPa, max. temperature in the test section 600°C, flow rate max. 200kg/h. SCWL will be used forcorrosion tests of candidate materials, studies of water radiolysis at supercritical conditions and fortesting of water chemistry suitable for operation. Both loops possess an irradiation channel withquite complicated internals design, whose complexity is imposed by current constraints onconstructional materials of nuclear experimental devices, which limit the choice and maximumsurface temperature of material of construction to 500°C for austenitic stainless steel. The workingtemperature will thus be attained only in a restricted volume of the test section. The channelinternals will be briefly described. The mentioned loops will represent novel experimental devices,whose objective is to gain and extend knowledge on materials and environment performance underthe influence of radiation
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Computing 1 (1966), S. 293-308 
    ISSN: 1436-5057
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Die beschriebene Methode ist eine Anwendung der mathematischen Logik und der Rechenmaschinentechnik auf Forschungsprobleme konkreter Wissenschaften. Es sei ein Modell (genauer, ein unäres semantisches Modell) gegeben, d. h. ein endliches (nicht leeres) System von Objekten und ein endliches System von Eigenschaften der Objekte, wobei es bekannt ist, welches Objekt welche Eigenschaften hat. (Die Objekte können z. B. Patienten sein und die Eigenschaften können verschiedene Krankheiten sein, oder die Tatsache, ob der Patient irgendein Medikament bekommen hat usw.) Der Forscher sucht gewöhnlich Zusammenhänge unter den Eigenschaften, die für alle (oder fast alle) Objekte gültig sind. Z. B. daß für jedes Objekt folgendes gilt: Wenn es die EigenschaftP 1 hat undP 2 nicht hat, dann hat esP 3. Findet er einen solchen Zusammenhang, der im Modell (der betrachteten Objekte) wahr ist, so kann er die Hypothese formulieren und weiter verifizieren, daß dieser Zusammenhang für alle existierenden Objekte wahr ist. Die Mittel der mathematischen Logik ermöglichen eine bestimmte geeignete Klasse von Formeln des Prädikatenkalküls (d. h. von formalisierten Sätzen) zu finden, auf die man sich beim Untersuchen des Modells beschränken kann (es handelt sich um bestimmte elementare Disjunktionen). Alle Formeln dieser Art können automatisch, mit einer Rechenmaschine, erzeugt und verifiziert werden. Die Maschine druckt die Formeln, die im Modell wahr (oder fast wahr) sind. Die GUHA-Methode (General Unary Hypotheses Automaton) kann also als Ersatz der Intuition (in einer bestimmten Etappe der Forschung), sagen wir, als Hypothesen-Anbieten, angesehen werden. In der vorliegenden Arbeit werden die Grundgedanken der Methode, die notwendige logische Theorie und die Beschreibung des Programms für die Rechenmaschine angeführt. Manche weitere zusammenhängende Probleme werden gelöst. Schließlich werden Angaben über die Realisierung auf der Maschine IBM 7040 (Wien) angeführt.
    Notes: Summary The presented method is an application of the mathematical logic and computer technique to the research problems of concrete sciences. Let us assume a model (precisely a unary semantic model), i. e. a finite nonempty system of objects and a finite system of properties, to be given. It is known, for each object and each property, whether or not the object possesses the property. (E. g., objects are patients and properties are diseases or facts that some medicines were administered etc.) The research worker usually looks for the relations among the properties that hold true for all or almost all the objects. E. g. that, for each object, the following holds true: if the object possesses the propertyP 1 and does not possess the propertyP 2 then it possesses the propertyP 3. If he finds this relation hold true in the model (of objects under consideration) then he is able to formulate and verify the hypothesis of validity of such a relation for all existing objects in general. The mains of mathematical logic make possible to find a suitable class of formulas of the predicate calculus (i. e. a class of formalized statements) to which the investigation of the model can be confined. (They are some elementary disjunctions.) The means of computer technique make possible to generate and verify all these special formulas automatically in an suitable ordering. In the output device of the computer there will appear all the hypotheses true or almost true in model. Hence the GUHA method (General Unary Hypotheses Automaton) can be considered as a substitution for an intuition in a certain phase of scientific research, say, as an “offering of hypotheses”. In this paper, the main ideas, the needed logical theory and programme description are given. Some further related problems are solved. Finally the experience of practical applications of the GUHA method on IBM 7040-System is described.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Archive for mathematical logic 30 (1990), S. 201-218 
    ISSN: 1432-0665
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract IΣ n andBΣ n are well known fragments of first-order arithmetic with induction and collection forΣ n formulas respectively;IΣ n 0 andBΣ n 0 are their second-order counterparts. RCA0 is the well known fragment of second-order arithmetic with recursive comprehension;WKL 0 isRCA 0 plus weak König's lemma. We first strengthen Harrington's conservation result by showing thatWKL 0 +BΣ n 0 is Π 1 1 -conservative overRCA 0 +BΣ n 0 . Then we develop some model theory inWKL 0 and illustrate the use of formalized model theory by giving a relatively simple proof of the fact thatIΣ 1 provesBΣ n+1 to be Π n+2-conservative overIΣ n . Finally, we present a proof-theoretic proof of the stronger fact that theΠ n+2 conservation result is provable already inIΔ 0 + superexp. ThusIΣ n+1 proves 1-Con (BΣ n+1) andIΔ 0 +superexp proves Con (IΣ n )↔Con(BΣ n+1).
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Soft computing 1 (1997), S. 3-5 
    ISSN: 1433-7479
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Soft computing 2 (1998), S. 14-15 
    ISSN: 1433-7479
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Soft computing 2 (1998), S. 124-128 
    ISSN: 1433-7479
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract  The many-valued propositional logic BL (basic fuzzy logic) is investigated. It is known to be complete for tautologies over BL-algebras (particular residuated lattices). Each continuous t-norm on [0,1] determines a BL-algebra; such algebras are called t-algebras. Two additional axioms B1, B2 are found such that BL+(B1,B2) is complete for tautologies over t-algebras. It remains open whether B1, B2 are provable in BL.
    Type of Medium: Electronic Resource
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  • 7
    Publication Date: 2006-10-20
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 8
    Publication Date: 2013-01-16
    Description: An interpretation of lattice-valued logic, defined by Titani, in basic fuzzy logic, defined by Hájek, is presented. Moreover, Titani's axioms of lattice-valued set theory are interpreted in fuzzy set theory, as defined by the authors.
    Print ISSN: 1367-0751
    Electronic ISSN: 1368-9894
    Topics: Mathematics
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  • 9
    Publication Date: 2013-01-16
    Description: Two equality predicates in Cantor-Lukasiewicz set theory (with full comprehension, over Lukasiewicz predicate logic) are investigated: extensional = e and Leibniz equality =. It is proved that there are many pairs of sets x, y such that x = e y & x!=y is true. In particular, x may be the set of natural numbers, defined together with ternary predicates for addition and multiplication. The main result says that the Cantor-Lukasiewicz set theory is essentially undecidable and essentially incomplete. The proof is difficult since it is not supposed that the set is crisp (non-fuzzy).
    Print ISSN: 1367-0751
    Electronic ISSN: 1368-9894
    Topics: Mathematics
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  • 10
    Publication Date: 2011-11-24
    Description: A particular notion of an interpretation of a theory over a fuzzy predicate logic in another such theory is discussed. For interpretability with the domain defined by a provably crisp formula, which is of course a syntactical notion, a semantic characterization is established. In the last section, we discuss the question of whether the extension of a decidable theory by a single new axiom is decidable and present an erratum to the paper (Hájek, 2007, Fundamenta informaticae , 81 , 155–163).
    Print ISSN: 0955-792X
    Electronic ISSN: 1465-363X
    Topics: Computer Science , Mathematics
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