4,715 research outputs found

    Effects of chemical equilibrium on turbine engine performance for various fuels and combustor temperatures

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    A study was performed to quantify the differences in turbine engine performance with and without the chemical dissociation effects for various fuel types over a range of combustor temperatures. Both turbojet and turbofan engines were studied with hydrocarbon fuels and cryogenic, nonhydrocarbon fuels. Results of the study indicate that accuracy of engine performance decreases when nonhydrocarbon fuels are used, especially at high temperatures where chemical dissociation becomes more significant. For instance, the deviation in net thrust for liquid hydrogen fuel can become as high as 20 percent at 4160 R. This study reveals that computer central processing unit (CPU) time increases significantly when dissociation effects are included in the cycle analysis

    A Note on the Minimum Number of Edges in Hypergraphs with Property O

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    An oriented kk-uniform hypergraph is said to have Property O if for every linear order of the vertex set, there is some edge oriented consistently with the linear order. Recently Duffus, Kay and R\"{o}dl investigated the minimum number f(k)f(k) of edges in a kk-uniform hypergaph with Property O. They proved that k!f(k)(k2lnk)k!k! \leq f(k) \leq (k^2 \ln k) k!, where the upper bound holds for kk sufficiently large. In this short note we improve their upper bound by a factor of klnkk \ln k, showing that f(k)(k2+1)k!k2(k1)!f(k) \le \left(\lfloor \frac{k}{2} \rfloor +1 \right) k! - \lfloor \frac{k}{2} \rfloor (k-1)! for every k3k\geq 3. We also show that their lower bound is not tight. Furthermore, Duffus, Kay and R\"{o}dl also studied the minimum number n(k)n(k) of vertices in a kk-uniform hypergaph with Property O. For k=3k=3 they showed n(3){6,7,8,9}n(3) \in \{6,7,8,9\}, and asked for the precise value of n(3)n(3). Here we show n(3)=6n(3)=6.Comment: 6 pages, 1 figur

    Doing Identity: Examining the Potential of the graphic novel American Born Chinese to foster identity development and Intercultural Competence in the EFL Classroom

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    Denne masteroppgaven undersøker potensialet i å bruke den grafiske novellen American Born Chinese som et didaktisk verktøy for å utvikle identitet og interkulturell kompetanse i engelsk klasserommet. Oppgaven viser hvor viktig identitet er for den overordnede utviklingen til elevene, og i å skape det nødvendige grunnlaget for samspill med andre mennesker. Elevene vil igjennom sine liv møte på nye identiteter som vil utfordre deres holdninger, meninger og selvforståelse. Dette viser hvor nødvendig det er med ferdigheter, forståelse og tankemåte som kan forberede elevene på disse interaksjonene. Analysen og drøftingen viser sammenkoblingen mellom identitet, interkulturell kompetanse og interkulturell bevissthet som grunnlaget for alle fremtidige interaksjoner. Skolen har et mandat i å sørge for mulighet til refleksjon og utvikling av identitet, for å forberede elevene på fremtidige møter. American Born Chinese som et didaktisk verktøy kan bidra i dette mandatet. Drøftingen og analysen i oppgaven viser at den har et sterkt potensial i å utvikle identitet og den nødvendige interkulturelle kompetansen gjennom sin intertekstualitet, grafiske form og karakterer. Den grafiske formen og karakterer videreformidler nye perspektiver som utfordrer elevenes holdninger, meninger og selvforståelse i forhold til andre identiteter.This thesis examines the potential of using the graphic novel American Born Chinese as a didactic tool to foster the development of identity and intercultural competence in the EFL classroom. Identity is shown to be an important aspect of the all-round development of the pupil, and in creating the necessary foundation for future interactions. Throughout their entire lives, the pupils will encounter new identities both locally and internationally that will challenge their opinions, attitudes and understanding of themselves. This shows the need for abilities, skills and a mindset that can prepare the pupils for these encounters. The analysis and discussion show how identity is linked with intercultural competence and awareness, which creates the foundation for all future interactions. The school has a mandate to ensure that there is room for reflection and development of identity, to prepare the pupils for these encounters. American Born Chinese as a didactic tool can help fulfil this mandate, as it holds great potential in developing and fostering identity through its intertextuality, graphic narrative, and characters as presented in the discussion. Its multimodal form and characters convey new perspectives, which enables the novel to challenge the pupils attitudes, opinions and understanding of themselves in relation to other identities

    Intellectual Property and Tabletop Games

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    There is a rich body of literature regarding intellectual property’s (“IP”) “negative spaces”—fields where creation and innovation thrive without significant formal protection from IP law. Scholars have written about innovation in diverse fields despite weak or nonexistent IP rights, such as fashion design, fine cuisine, stand-up comedy, magic tricks, tattoos, and sports plays. Instead, these fields rely on social norms, first- mover advantage, and other (non-IP) legal regimes to promote innovation in the absence of IP protection. As a comparison to these studies, this Article comprehensively analyzes the role of IP law in facilitating innovation in tabletop gaming, including board games, card games, and pen-and-paper role-playing games. Over the past several decades, the tabletop gaming industry has seen a proliferation of innovation, but there is surprisingly little in the academic literature about IP and tabletop games. IP rights, including patents, copyrights, and trademarks, each protect certain aspects of games, while at the same time being constrained by doctrinal limitations that leave considerable flexibility for others to develop their own games and adapt or improve upon existing ones. There are also numerous examples of user-based innovation in tabletop gaming. This Article concludes by contending that IP rights, as well as their limitations, play a significant role in facilitating the robust innovation presently occurring in the tabletop gaming field

    Insights into the Adsorption Thermodynamics of Arsenates on Boehmite

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