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2172. Collisional transport model for intense bed load

Creator:
Matoušek, Václav and Zrostlík, Štěpán
Format:
počítač and online zdroj
Type:
model:article and TEXT
Subject:
granular flow, sheet flow, sediment transport, grain collision, tilting flume experiment, and kinetic theory
Language:
Slovak
Description:
In an open channel with a mobile bed, intense transport of bed load is associated with high-concentrated sediment-laden flow over a plane surface of the eroded bed due to high bed shear. Typically, the flow exhibits a layered internal structure in which virtually all sediment grains are transported through a collisional layer above the bed. Our investigation focuses on steady uniform turbulent open-channel flow with a developed collisional transport layer and combines modelling and experiment to relate integral quantities, as the discharge of solids, discharge of mixture, and flow depth with the longitudinal slope of the bed and the internal structure of the flow above the bed. A transport model is presented which considers flow with the internal structure described by linear vertical distributions of granular velocity and concentration across the collisional layer. The model employs constitutive relations based on the classical kinetic theory of granular flows selected by our previous experimental testing as appropriate for the flow and transport conditions under consideration. For given slope and depth of the flow, the model predicts the total discharge and the discharge of sediment. The model also predicts the layered structure of the flow, giving the thickness of the dense layer, collisional layer, and water layer. Model predictions are compared with results of intense bed-load experiment carried out for lightweight sediment in our laboratory tilting flume.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

2173. Combined proton NMR wideline and NMR relaxometry to study SOM-water interactions of cation-treated soils

Creator:
Schaumann, Gabriele E., Diehl, Dörte, Bertmer, Marko, Jaeger, Alexander, Conte, Pellegrino, Alonzo, Giuseppe, and Bachmann, Jörg
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
soil organic matter (SOM), low field 1 H NMR relaxometry, 1 H wideline NMR spectroscopy, contact angle, cation bridges, and water molecule bridges
Language:
Slovak
Description:
Focusing on the idea that multivalent cations affect SOM matrix and surface, we treated peat and soil samples by solutions of NaCl, CaCl2 or AlCl3. Water binding was characterized with low field 1 H-NMR-relaxometry (20 MHz) and 1 H wideline NMR spectroscopy (400 MHz) and compared to contact angles. From 1 H wideline, we distinguished mobile water and water involved in water molecule bridges (WaMB). Large part of cation bridges (CaB) between SOM functional groups are associated with WaMB. Unexpectedly, 1 H NMRrelaxometry relaxation rates suggest that cross-linking in the Al-containing peat is not stronger than that by Ca. The relation between percentage of mobile water and WaMB water in the context of wettability and 1 H NMR relaxation times confirms that wettability controls the water film surrounding soil particles. Wettability is controlled by WaMB-CaB associations fixing hydrophilic functional groups in the SOM interior. This can lead to severe water repellency. Wettability decreases with increasing involvement of functional groups in CaB-WaMB associations. The results demonstrate the relevance of CaB and WaMB for the dynamics of biogeochemical and hydrological processes under field conditions, as only a few percent of organic matter can affect the physical, chemical, and biological functioning of the entire 3-phase ecosystem.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

2178. Common ground, conversational roles and epistemic injustice

Creator:
Bräuer, Felix
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
common ground, conversational roles, conversation-types, epistemic injustice, Miranda Fricker, and Mitchell Green
Language:
Slovak
Description:
People partaking in a conversation can add to the common ground of said conversation by performing different speech acts. That is, they can influence which propositions are presumed to be shared among them. In this paper, I am going to apply the common ground framework to the phenomenon of epistemic injustice. In doing so, I am going to focus on two kinds of speech acts: making assertions and asking certain kinds of questions. And I am going to look at three varieties of epistemic injustice: testimonial injustice, inquiring injus- tice and interpretative injustice. I am going to argue that what all these varieties of epistemic injustice have in common is that they unfairly inhibit the speaker’s ability to add to the common ground in the way intended by her. This in turn negatively affects which conversational roles a speaker can play in a given conversation. Based on these results, I am going to end by looking at some of the harms that epistemic injustice inflicts upon its victims.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

2179. Common source of the paradoxes of inference and analysis

Creator:
Šebela, Karel
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
Aristotle, pre-knowledge, the paradox of analysis, and the paradox of inference
Language:
Slovak
Description:
The paper deals with the paradoxes of inference and analysis. It attempts to show what is specific about these paradoxes. They have got a lot in common. Often, they are not considered paradoxes in the strict sense at all. Moreover, they both raise the same problem: How can the requirements of correctness and informativeness be both met for inference and for conceptual analysis? The strategies developed to address the problem are similar for both cases. In the paper, I claim that the paradoxes have common origins. This claim is supported by comparing different strategies adopted to resolve the problem. Regarding their origins, both paradoxes share the epistemological framework that is grounded in Aristotle’s theory of science. This is related to the problem of implicit knowledge, which is a variation on a dilemma formulated by Plato in his Meno. Aristotle’s solution to the dilemma of Meno is discussed and considered as another plausible strategy for dealing with the paradoxes of inference and analysis., Příspěvek se zabývá paradoxy odvození a analýzy. Snaží se ukázat, co je na těchto paradoxech specifické. Mají spoustu společného. Často nejsou vůbec považovány za paradoxy. Oba tyto otázky navíc vyvolávají stejný problém: Jak mohou být splněny požadavky na správnost a informativnost pro závěry a pro koncepční analýzu? Strategie vyvinuté pro řešení tohoto problému jsou podobné v obou případech. V příspěvku tvrdím, že paradoxy mají společný původ. Toto tvrzení je podpořeno porovnáním různých strategií přijatých k vyřešení problému. Pokud jde o jejich původ, oba paradoxy sdílejí epistemologický rámec, který je založen na Aristotelově teorii vědy. To souvisí s problémem implicitní znalosti, což je variace na dilema formulované Platónem v jehoMeno . Aristotelovo řešení dilematu Meno je diskutováno a považováno za další přijatelnou strategii pro řešení paradoxů odvození a analýzy., and Karel Šebela
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

2180. Communication in a multi-cultural world

Creator:
Duží, Marie
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
communication, concept, procedural isomorphism, structured meaning, and transparent intensional logic
Language:
Slovak
Description:
The goal of this paper is to demonstrate that procedurally structured con- cepts are central to human communication in all cultures and throughout history. This thesis is supported by an analytical survey of three very different means of communication, namely Egyptian hieroglyphs, pictures, and Inca knot writing known as khipu. My thesis is that we learn, communicate and think by means of concepts; and regardless of the way in which the meaning of an expression is encoded, the meaning is a concept. Yet we do not define concepts within the classical set-theoretical framework. Instead, within the logical framework of Transparent Intensional Logic, we explicate concepts as logical procedures that can be assigned to expressions as their context-invariant meaning. In particular, complex meanings, which structurally match complex expressions, are complex procedures whose parts are sub-procedures. The moral suggested by the paper is this. Concepts are not flat sets; rather, they are algorithmically structured abstract procedures. Unlike sets, concepts have constituent sub-procedures that can be executed in order to arrive at the product of the procedure (if any). Not only particular parts matter, but also the way of combining these parts into one whole ''instruction'' that can be followed, understood, executed, learnt, etc., matters., Cílem příspěvku je ukázat, že procesně strukturované koncepty jsou ústředním bodem lidské komunikace ve všech kulturách a v průběhu dějin. Tato práce je podpořena analytickým průzkumem tří velmi odlišných komunikačních prostředků, konkrétně egyptských hieroglyfů, obrázků a psaní uzlů Inků známých jako khipu. Má diplomová práce je, že se učíme, komunikujeme a myslíme pomocí konceptů; a bez ohledu na způsob, jakým je význam výrazu zakódován, významem je pojem. Nedefinujeme však koncepty v rámci klasického teoretického rámce. Místo toho, v logickém rámci Transparentní Intenzionální Logiky, vysvětlujeme pojmy jako logické procedury, které mohou být přiřazeny výrazům jako jejich kontextově invariantní význam. Zejména složité významy, které strukturně odpovídají komplexním výrazům, jsou složité postupy, jejichž součástí jsou dílčí postupy. Morální návrh, který tento článek navrhl, je toto. Pojmy nejsou ploché soupravy; jsou to spíše algoritmicky strukturované abstraktní postupy. Na rozdíl od sad, koncepty mají dílčí dílčí postupy, které mohou být provedeny, aby se dospělo k produktu postupu (pokud existuje). Nezáleží jen na jednotlivých částech, ale také na způsobu spojování těchto částí do jedné ,,instrukce'', kterou lze sledovat, chápat, realizovat, učit se atd., Záleží na tom., and Marie Duží
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

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