This paper presents some structural properties of a generalized Petri net (PN) with an algorithm to determine the (partial) conservativeness and (partial) consistency of the net. A product incidence matrix A=CCT or A~=CTC is defined and used to further improve the relations among PNs, linear inequalities and matrix analysis. Thus, based on Cramer's Rule, a new approach for the study of the solution of a linear system is given in terms of certain sub-determinants of the coefficient matrix and an efficient algorithm is proposed to compute these sub-determinants. The paper extends the common necessary and/or sufficient conditions for conservativeness and consistency in previous papers and some examples are designed to explain the conclusions finally.
We have investigated the time profiles of flare heating function for selected flares based on the analysis of their evolutionary paths in the Emission Measure - Temperature diagrams. The emission measures and the temperatures werederived from the Ca XIX soft X-ray spectra observed by the Bent Crystal Spectrometer aboard the Solar Maximum Mission satellite. Interpretation of these diagrams allows to study the rate of energy deposition during both rise and decay phase of flares. The investigation of (EM-T) diagrams during
the decay phase allows furthermore for determination of effective length/cross-sectional area ratio of the flaring loop. We háve used the value of this ratio to derive the effective loop cross-sectional radius and the plasma density from deconvolved Fiat Crystal Spectrometer soft X-ray images.
Over a large range of the pressure, one cannot ignore the fact that the viscosity grows significantly (even exponentially) with increasing pressure. This paper concerns long-time and large-data existence results for a generalization of the Navier-Stokes fluid whose viscosity depends on the shear rate and the pressure. The novelty of this result stems from the fact that we allow the viscosity to be an unbounded function of pressure as it becomes infinite. In order to include a large class of viscosities and in order to explain the main idea in as simple a manner as possible, we restrict ourselves to a discussion of the spatially periodic problem.
High temperature alters the internal microstructure of rocks and consequently changes the physical and mechanical properties of rocks. Many studies have been carried out to examine the transformations in the microstructures of rocks under high temperature through near infrared spectroscopy (NIR), Raman spectroscopy, or thermo gravimetric analysis (TGA). The current review synthesizes the data from a number of literatures and summarizes the major transformations of silica rocks under high temperature. The analysis shows that silica rocks starts to lose the water adsorbed in open pores upon heating at about 150 °C. At 200-300 °C, the reaction between SiOH (silanole) in the rocks generates new Si-O-Si bonds as well as H2O, and decreases the open pores. The rocks undergo volume expansion at >550 °C, and the volume contracts and forms new micro pores or cracks which play an important role in the evacuation of the water., Jishi Geng, Qiang Sun, Yuchun Zhang and Yuliang Zhang., and Obsahuje bibliografické odkazy
In this paper, we deal with sentences containing time references like ''five years ago'', ''three years older'', ''in five seconds''. It turns out that such sentences are pragmatically incomplete, because there is an elliptic reference to a calendar that makes it possible to determine the length of the time interval associated with a time duration like a year, month, day, or to compute the time interval denoted by terms like ''February 29, 2016''. Since Transparent Intensional Logic (TIL) takes into account two modal parameters, namely possible worlds of type ω and times of type τ, and this system is particularly apt for the analysis of natural language expressions, our background theory is TIL. Within this system, we define time intervals, calendar time durations, and last but not least a method for adding and multiplying time durations in a way that takes into account the leap days and leap seconds. As sample applications, we analyse two sentences, to wit, ''A year has 365 days'' and ''Adam is 5 years older than Bill''. and V tomto článku se zabýváme věty obsahujícími časové odkazy jako ''před pěti lety'', ''o tři roky starší'', ''za pět sekund''. Ukazuje se, že takové věty jsou pragmaticky neúplné, protože existuje eliptický odkaz na kalendář, který umožňuje určit délku časového intervalu spojeného s časovým obdobím jako rok, měsíc, den nebo vypočítat časový interval označované slovy ''29. února 2016''. Vzhledem k tomu, že Transparentní Intenzivní Logika (TIL) zohledňuje dva modální parametry, jmenovitě možné světy typu ω a časy typu τ, a tento systém je obzvláště vhodný pro analýzu přirozených jazykových výrazů, je naší teorií pozadí TIL. V rámci tohoto systému definujeme časové intervaly, trvání kalendáře, a v neposlední řadě metoda pro přidání a násobení doby trvání způsobem, který bere v úvahu skokové a skokové sekundy. Jako vzorové aplikace analyzujeme dvě věty s názvem ''rok má 365 dní'' a ''Adam je o 5 let starší než Bill''.
This paper proposes a non-trivial definition of the notion of analytic method. Working within the so-called instructional model of method, I distinguish three kinds of instructions which occur in methods: selective, executive, and declarative instructions. I discuss the relation between each of these and the analyticity of a method. Then I define the notions of an analytic use of an instruction and of an analytic instruction, which are at the basis of the proposed definition of an analytic method. Finally, I discuss the issue of circularity in the presented model which arises if we consider a finite agent testing a method for analyticity., Tato práce navrhuje netriviální definici pojmu analytická metoda. V rámci tzv. Instruktážního modelu metody rozlišuji tři druhy instrukcí, které se vyskytují v metodách: selektivní, exekutivní a deklarativní . Diskutuji o vztahu mezi každou z nich a analytičnosti metody. Dále definuji pojmy analytického použití instrukce a analytické instrukce , které jsou základem navrhované definice analytické metody. Závěrem se zabývám otázkou kruhovitosti v prezentovaném modelu, která vzniká, pokud uvažujeme konečný agent testující metodu analyticity., and Miloš Kosterec
We introduce an one-dimensional thermodynamical particle model which is efficient in predictions about a microscopical structure of animal/human groups. For such a model we present analytical calculations leading to formulae for time clearance distribution as well as for time spectral rigidity. Furthermore, the results obtained are reformulated in terms of vehicular traffic theory and consecutively compared to experimental traffic data.
Hlavní motivací pro zavádění abstraktních subjektů v literární vědě je analýza fungování literárního díla v komunikačním procesu mezi autorem a čtenářem. Na ekovské teorii abstraktních subjektů lze sledovat především dva problémy: efektivitu zavedení daného konceptuálního rámce a jeho aplikaci na analýzu komunikačních rovin v narativním textu. Řešení problému efektivity zavedení abstraktních subjektů předpokládá především vyjasnění určitých metateoretických a případně rovněž teoretických předpokladů. Na metateoretické rovině lze rozlišit tzv. realistický a funkcionalistický přístup. V rámci prvého přístupu je hlavním úkolem popis povahy a vztahů základních konstituentů komunikačního procesu, přičemž tento popis je ovlivněn základovou ontologií projevující se na slovníku dané teorie. V rámci druhého přístupu je hlavním úkolem znázornění struktury komunikačního procesu a abstraktních pozic tvořících základní složky této struktury. Problém analýzy komunikace v naratologických textech v ekovském kontextu předpokládá usouvztažnění pojmů modelového autora a vypravěče, tedy dvou různých rovin komunikace realizované prostřednictvím literárního textu, kdy na jedné straně stojí komunikace mezi autorem a čtenářem, na straně druhé pak komunikace probíhající uvnitř fikčního světa narativu. Předložená studie usiluje především o kritické zhodnocení způsobu, jakým Eco pracuje s předpokladem abstraktních subjektů modelového autora a modelového čtenáře, a měla by nabízet reflexi možných postojů v konkrétní literárněvědní diskuzi, a na základě toho vymezit prostor dílčím diskuzím mezi jednotlivými stanovisky a zamezit vzniku pseudosporů plynoucích z nevyjasnění předpokládaného (meta)teoretického rámce. and The chief motivation for introducing abstract subjects in literary studies is the analysis of the operation of the work of literature in the process of communication between author and reader. One observes two main problems with Eco’s theory of abstract subjects: the effectiveness of introducing a conceptual framework and its application to the analysis of the levels of communication in the narrative text. The treatment of the problem of the effectiveness of introducing abstract subjects assumes mainly a clarification of certain metatheoretical and possibly also theoretical premises. At the metatheoretical level one can distinguish between the ‘realistic’ and the ‘functionalistic’ approach. In the first, the chief task is to describe the nature and relations of the basic constituents of the process of communication, in which this description is influenced by the underlying ontology appearing in the terminology of the given theory. In the second, the chief task is to illustrate the structure of the process of communication and of the abstract positions that constitute the basic components of this structure. The problem of the analysis of communication in narratological texts in Eco’s works presumes the correlation of the terms of model author and model narrator, in other words, two different levels of communication implemented by means of the literary text, where the communication between author and reader lies on one side and the communication taking place within the fictional world of the narrative lies on the other. This article seeks mainly to achieve a critical assessment of the means by which Eco operates with the premise of the abstract subjects of model author and model reader. The article intends to offer reflections on possible approaches in a specific literary studies debate, and, on this basis, to define the space for more narrowly defined discussions with individual standpoints, and to limit the emergence of pseudo‑discussions that arise from fuzzy (meta)theoretical framework.
1_ Analysis of chipped stone industry from Kopčany and Brehov (Slovakia). The fl ake stone assemblages (and other assemblages) which were discovered during the excavation of two archaeological sites in Eastern Slovakia – Zemplínske Kopčany and Brehov were analysed. Seventeen stone artefacts were found in object No. 24A-D/1974 at Zemplínske Kopčany. Obsidian stone, which is a local raw material, occurs at a higher frequency than imported raw materials – Jurassic fl int “G” and basalt. With the exception of two blanks (cores), the assemblage consists of fi nished tools, most of which were made on blades. Other tools present include two fl ake scrapers and a blunt drill made of Jurassic fl int “G”. One obsidian core is lightly reduced and the second obsidian core has a pyramidal shape. The remainder of the Zemplínske Kopčany assemblage includes ten fi nished products made of local (sedimentary rocks) and imported raw material (amphibolite?). Whetstones are most common and axes are less numerous. The assemblage also includes a wedge, a fragment of an axe-hammer, a globular pestle and conical byproducts from axe-hammer production., 2_ Local raw materials were used at Brehov. The local obsidian dominates and other stone materials are present in small proportions. The typological character of the fl ake industries is also different. Flakes account for 68 % of the artefacts and blades 25 %. Specifi c artefacts are the „łuszcznie“ (“Splitter” in German) though to have been used as chisels or cutting tools. The cores are very small and lightly reduced. One pebble with negative scars and one drill (borer) are also present. Other artefacts include a shaft of a fl at axe made of local hornstone and a fragment of an unfi nished granodiorite axe-hammer with a hole drilled in the middle (possibly originating from the High Tatras?). The analyzed assemblages are compared with assemblages from other Baden Culture sites in Slovakia and in particular to those from the Malopolskie Voivodship. The analyzed artefacts from Zemplínske Kopčany and Brehov correspond to two phases in the development of the Baden Culture. The older phase has stronger affi nities to the Funnel Beaker Culture, and in the case of the Brehov site, to a younger phase, which is parallel with the Pleszow-Zesławice group in the Malopolskie Voivodship., Marián Soják., and Obsahuje seznam literaruty