120 research outputs found
Comparison between paraffin and polyethylene in hybrid thruster with catalytically decomposed hydrogen peroxide
No full textDESIGN AND PERFORMANCE EVALUATION OF LAB-SCALE HYBRID THRUSTER USING CATALYTICALLY DECOMPOSED HYDROGEN PEROXIDE
No full textAblation laser fluence as an effective parameter to control superconductivity in Ba1−xKxBiO3 films
No full textPotassium doping in insulating BaBiO3 induces superconductivity, with high superconducting transition temperatures, Tc, of up to 31 K in bulk. We investigated growth control of superconducting properties of BKBO films, by varying laser fluence using pulsed laser deposition technique. As cation stoichiometry, especially potassium concentration in BKBO films, was sensitively changed with laser fluence, we were able to precisely control Tc of BKBO films. Following the trend of the bulk phase diagram, Tc showed the highest value of 24.5 ± 0.5 K at the optimal stoichiometry. This result can provide optimal guidance for the synthesis of high-quality BKBO films, and demonstrates the effectiveness of laser fluence to study emerging superconducting phenomena in PLD-grown complex oxide thin films. © 2017 Elsevier B.V
Double-Layer Buffer Template to Grow Commensurate Epitaxial BaBiO3 Thin Films
Full text linkWe propose a BaCeO3/BaZrO3 double-layer buffer template, grown on a SrTiO3 substrate, for epitaxial growth of a target oxide film with large lattice constants of over 4.1 . Lattice mismatch from the substrate was mostly accommodated for by a BaZrO3 arbitrating layer. Having an ideal in-plane lattice structure, BaCeO3 served as the main-buffer to grow the target material. We demonstrated commensurate epitaxy of BaBiO3 (BBO,a = 4.371 ) utilizing the new buffer template. Our results can be applied to heteroepitaxy and strain engineering of novel oxide materials of sizable lattice constants. © Author(s) 20161421sciescopu
Hot Steam Corrosion Behavior of Ni-based Superalloys at High Temperature Steam Environments
No full textEmpodisma minus ()
No full textClass: Monocotyledoneae
Family: Restionaceae
Genus: Empodisma
Species: minu
Arctium minus (Common Burdock) : Common Burdock
No full textClass: Dicotyledoneae
Family: Asteraceae
Genus: Arctium
Species: minu
Arctium minus (Common Burdock) : Common Burdock
No full textClass: Dicotyledoneae
Family: Asteraceae
Genus: Arctium
Species: minu
Topotactic Metal-Insulator Transition in Epitaxial SrFeOx Thin Films
No full textTopotactic phase transformation enables structural transition without losing the crystalline symmetry of the parental phase and provides an effective platform for elucidating the redox reaction and oxygen diffusion within transition metal oxides. In addition, it enables tuning of the emergent physical properties of complex oxides, through strong interaction between the lattice and electronic degrees of freedom. In this communication, the electronic structure evolution of SrFeOx epitaxial thin films is identified in real-time, during the progress of reversible topotactic phase transformation. Using real-time optical spectroscopy, the phase transition between the two structurally distinct phases (i.e., brownmillerite and perovskite) is quantitatively monitored, and a pressure-temperature phase diagram of the topotactic transformation is constructed for the first time. The transformation at relatively low temperatures is attributed to a markedly small difference in Gibbs free energy compared to the known similar class of materials to date. This study highlights the phase stability and reversibility of SrFeOx thin films, which is highly relevant for energy and environmental applications exploiting the redox reactions. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim1651sciescopu
Autobiograafia kui „tõe” diskursus: Lilli Suburgi „Minu saatusega võitluskäik”. Autobiography as the Discourse of “Truth”: Lilli Suburg’s Minu saatusega võitluskäik
No full textLilli Suburg (1841-1923) is an author in Estonian literary and cultural history who is not well researched, though her literary output is sufficiently large and her manuscript heritage many-sided, casting light on the little known aspects of her work and activity. Suburg was active in very different fields: she is known as a writer, journalist, feminist and educator. Her literary work is diverse and prolific; she wrote short stories, children’s stories, journalistic texts as well as philosophical essays. In Suburg’s work the autobiographical element plays a significant role, so that we can say that throughout her whole life she wrote her own autobiography, albeit using different forms. In this article, I example specifically the autobiography written by Lilli Suburg (1841-1923) entitled Minu saatusega võitluskäik (My Fight is my Destiny) (1914), with the aim of introducing the text to the modern reader and analysing its content and peculiarities. As the text was published almost a hundred years ago, it deserves to be read anew and given a fresh interpretation from a modern point of view. The text certainly adds some new aspects to understanding Lilli Suburg’s life and activity; in the article I will analyse how Suburg looks at herself and her life and the reasons why she chose to write an autobiography with a feminist emphasis. The autobiography was published in the magazine Naiste Töö ja Elu (Women’s Work and Life) in 1914 and to date it is the first and only feminist autobiography in Estonia. As Suburg had been a contributor to the magazine since its foundation in 1911, it provided a forum where she was able to share her feminist ideas and worldview with the readers. The magazine’s readers were understanding and supportive of feminist ideas, and the magazine’s focus was on women’s issues and women’s interests, the contributors being the leading women of the time. In her autobiography Suburg gives an overview of her life, justifies the choices in her life and how and why she began to fight for women’s rights. Suburg positioned herself as a fighter and argued that it was the facts of her life that shaped her destiny. Suburg used this opportunity of life writing to reveal “the truth” about her life and activity: by creating a textual space for her point of view and her “truth” she wanted to dispel misunderstanding and to overcome a pejorative attitude that she encountered during her lifetime. This is why the text can be seen as the discourse of “truth”, which should give legitimacy to Suburg’s worldview. The autobiography is structured chronologically and covers Suburg’s life from her birth to her old age. The text is framed by direct addresses to the reader in the first person plural “we” form, through which the author identifies herself with the woman reader, thus lessening the distance between herself and the reader. Suburg emphasises the details in her growth, which shaped her feminist worldview, and by doing so critiques the prevalent gender roles. Suburg presents herself as a lone fighter in the public space at the end of the 19th century; as a public figure she had no female co-fighters. At the same time she confesses that her position as a fighter for women’s rights was something that she could not give up; although her efforts were fruitless she did not find a way she could retreat. This revelation shows the uniqueness of Suburg’s position: as the only woman in the public sphere in the late 19th century Estonia, this fighter and feminist could not rely on anyone, not even on the support of women, because the impact of women in public life was insignificant due to the conservative gender ideology and laws and customs that restricted women’s rights. By acting in the public sphere Suburg took over a man’s position; she assumed the role that belonged to men in her time. This made her position particularly vulnerable, but Suburg’s pride and fighting nature did not allow her to surrender and retreat. The autobiography is feminist because of the author’s position, which emphasizes the idea of finding one’s own way. Although many of the episodes described in this text can be found in other autobiographical writings by Suburg, the autobiography offers novel information about her. In Suburg’s view Minu saatusega võitluskäik is a kind of discourse of “truth”, which means that Suburg saw this autobiography as a discourse of “truth telling”. The biographical facts were arguments with which Suburg justified her choices; they served to emphasize the rightfulness of her past life and ideas. Life experience as the criterion for truth pervades the entire autobiography and forms its ideological and narrative backbone. Given this meaning, the autobiography has significance and a wider resonance, and earns the reader’s trust. The role of the reader is to believe Suburg’s narrative such as it is and follow Suburg’s arguments and empathize with her quest for truth. What remains is Suburg’s conviction that her destiny shaped her and that is why she is who she is
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