1,375 research outputs found
Biotic and abiotic alteration of hydrothermal sulphides at the seafloor
No full textWhen active venting has ceased, reduced minerals in hydrothermal mounds and sediments
continue to provide an inorganic energy source for chemolithotrophic microbes.
This research focuses on the nature of microbially-mediated metal transformations in
hydrothermal sediments during sulphide alteration and their impact on the ultimate
fate of hydrothermal sulphides on the seafloor. The core studied is more seawater
altered than other cores studied at TAG and provides an insight into the bacterial
and archaeal communities as well as the geochemical processes taking place in highly
altered metalliferous sediments.
This study combines geochemical approaches with microbiological and organic
biomarker measurements within the suboxic transition zone of sulphidic sediments
to characterise the reactions and microbial communities present. This integrated
approach demonstrates that (a) there is biogeochemical zonation within the sediment
sequence with distinct microbial communities present at the sulphide-oxic seawater
transition, (b) the microbes identified are associated with Fe and S redox cycling, (c)
Marinobacter sp. are dominant at the sulphide interface.
There is a significant shift in the microbiological community across the redox transition
zone in these sulphidic sediments. The microbial assemblage of the suboxic transition
zone is dominated by Bacillus sp. which are microaerophilic whereas the sulphide
layer assemblage is dominated by Marinobacter sp. which are Fe oxidisers. Based
on biomarker assemblages and genetic analyses, archaeal (and to a certain degree
bacterial) communities are comparable to other hydrothermal settings despite the low
biomass present. Processes inferred to be important in this sediment include the S, Fe
and N cycle, all potentially coupled to the release and uptake of a range of transition
metals.
Significant recycling of redox active species occurs in the suboxic transition zones present in the sediment core. Uranium concentrations are low compared with
other less altered sulphidic hydrothermal sediments, and U is associated with the
upper regions of the suboxic transition zone and is associated with enrichment of a
suite of other transition metals (e.g. Cu, Mo, As and V).
Massive electrodes were constructed from CuFeS2 (from Ireland and TAG) and
FeS2 (from TAG) and studied in oxygenated artificial seawater under circumneutral
conditions using electrochemical methods. The results can be explained by existing
hypotheses about pyrite and chalcopyrite oxidation and their oxidation products. The
oxidation status of Cu in covellite could be identified as Cu+1. Impurities found (as
expected because natural samples were used) have no effect on the electrochemical
behaviour of the electrodes.
The impact of Marinobacter sp. on sulphide alteration was studied in detail using
an electrochemical approach. The results demonstrate that Marinobacter aquaeolei
enhances the rates of oxidation. Marinobacter species seem to be of special importance
for weathering reactions on the seafloor and in hydrothermal settings like the TAG
area
Kosciusko [music] /
No full textFor voice and piano.; Cover title.; "Introduced & sung by Miss Nella Webb."; Cover carries portraits of Nella Webb (by Rudolph Buchner), Charles Vaude and Moritz Lutzen.; Words printed as text on p. [4].; "During Moritz Lutzen's visit to Australia he offered a prize for the best lyric, by an Australian author to be set to music by himself. The prize was awarded to Charles Vaude, for his lyric 'Kosciusko,' and Miss Nella Webb produced this song with instantaneous success."--P. [4].; Also available online http://nla.gov.au/nla.mus-an8393500; 1913, by Victor J. Draper, Sydney.; NLA's NL copy from the collection of Keith Watson. ANL
Letter containing inquiry regarding the ethnic identity of the descendents of Georg Moritz Oppenheim.
No full textLetter from Wilhelm Gehlig to Rabbi Dr. Freudenthal in Nuremberg with a genealogical question regarding Georg Moritz Oppenheim. Of particular interest to the author is to determine whether Oppenheim's descendents are "rein jüdischen Blutes (=of pure Jewish blood)."Robert Singermandigitize
Conventional and circular economy compliant modification strategies for recycled polypropylene
No full textAuthor Moritz MagerMasterarbeit Universität Linz 2021Arbeit gesperr
Conventional and circular economy compliant modification strategies for recycled polypropylene
No full textAuthor Moritz MagerMasterarbeit Universität Linz 2021Arbeit gesperr
Hayo Haya Maaseh [= Once upon a time]
No full textAnthology of East European Jewish folklore, with introduction and sources. The anthology includes: songs, tales, traditions, customs, jokes, proverbs, riddles. Authored by Chaim Ben Zion Elon-Baranik (born 1901). Published immediately after the Second World War. Illustrations by Moritz Oppenheimer, L. Pilichowski, Yosef Budko, E.M. Lilien (his signature in print). Most of the illustrations are printed on separated chrome paper, on one side of the page. Folklore publishing, Tel Aviv. HaIvri press, Jerusalem. 22 em. [1],303, [3] pages. Excellent condition. Chipped top of spine. . '... Olb price140-160This is a hardbound book (hard cover)Language note: HebrewChaim Ben Zion Elon-Barani
zbMATH Open: API Solutions and Research Challenges
No full textWe present zbMATH Open, the most comprehensive collection of reviews and bibliographic metadata of scholarly literature in mathematics. Besides our website https://zbMATH.org which is openly accessible since the beginning of this year, we provide API endpoints to offer our data. The API improves interoperability with others, i.e., digital libraries, and allows using our data for research purposes. In this article, we (1) illustrate the current and future overview of the services offered by zbMATH; (2) present the initial version of the zbMATH links API; (3) analyze potentials and limitations of the links API based on the example of the NIST Digital Library of Mathematical Functions; (4) and finally, present the zbMATH Open dataset as a research resource and discuss connected open research problems
Discovering Mathematical Objects of Interest -- A Study of Mathematical Notations
No full textMathematical notation, i.e., the writing system used to communicate concepts in mathematics, encodes valuable information for a variety of information search and retrieval systems. Yet, mathematical notations remain mostly unutilized by today's systems. In this paper, we present the first in-depth study on the distributions of mathematical notation in two large scientific corpora: the open access arXiv (2.5B mathematical objects) and the mathematical reviewing service for pure and applied mathematics zbMATH (61M mathematical objects). Our study lays a foundation for future research projects on mathematical information retrieval for large scientific corpora. Further, we demonstrate the relevance of our results to a variety of use-cases. For example, to assist semantic extraction systems, to improve scientific search engines, and to facilitate specialized math recommendation systems. The contributions of our presented research are as follows: (1) we present the first distributional analysis of mathematical formulae on arXiv and zbMATH; (2) we retrieve relevant mathematical objects for given textual search queries (e.g., linking {n}^{(\alpha, \beta)}\!\left(x\right)$ with `Jacobi polynomial'); (3) we extend zbMATH's search engine by providing relevant mathematical formulae; and (4) we exemplify the applicability of the results by presenting auto-completion for math inputs as the first contribution to math recommendation systems. To expedite future research projects, we have made available our source code and data
Discovering Mathematical Objects of Interest -- A Study of Mathematical Notations
No full textMathematical notation, i.e., the writing system used to communicate concepts in mathematics, encodes valuable information for a variety of information search and retrieval systems. Yet, mathematical notations remain mostly unutilized by today's systems. In this paper, we present the first in-depth study on the distributions of mathematical notation in two large scientific corpora: the open access arXiv (2.5B mathematical objects) and the mathematical reviewing service for pure and applied mathematics zbMATH (61M mathematical objects). Our study lays a foundation for future research projects on mathematical information retrieval for large scientific corpora. Further, we demonstrate the relevance of our results to a variety of use-cases. For example, to assist semantic extraction systems, to improve scientific search engines, and to facilitate specialized math recommendation systems. The contributions of our presented research are as follows: (1) we present the first distributional analysis of mathematical formulae on arXiv and zbMATH; (2) we retrieve relevant mathematical objects for given textual search queries (e.g., linking {n}^{(\alpha, \beta)}\!\left(x\right)$ with `Jacobi polynomial'); (3) we extend zbMATH's search engine by providing relevant mathematical formulae; and (4) we exemplify the applicability of the results by presenting auto-completion for math inputs as the first contribution to math recommendation systems. To expedite future research projects, we have made available our source code and data
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