31,962 research outputs found
Mirabolic Howe duality
No full textWe establish a duality between a pair of mirabolic quantum groups, i.e., the mirabolic counterpart of quantum Howe duality
Triassic–Jurassic granites on the Lord Howe Rise, northern Zealandia
No full text<div><p>We present U–Pb zircon ages from a phosphate-cemented pebbly sandstone dredged from the central Lord Howe Rise and a 97 Ma rhyolite drilled on the southern Lord Howe Rise. Four granitoid pebbles from the sandstone give U–Pb ages in the range 216–183 Ma. Most detrital zircons in the bulk sandstone are also Late Triassic–Early Jurassic, but subordinate populations of Late Cretaceous and Precambrian zircons are present. The pebbly sandstone's highly restricted Late Triassic–Early Jurassic zircon population indicates the nearby occurrence of underlying basement plutons that are the same age as parts of the I-type Darran Suite, Median Batholith of New Zealand and supports a continuation of the Early Mesozoic magmatic arc northwest from New Zealand. Zircon cores from the southern Lord Howe Rise rhyolite do not yield ages older than 97 Ma and thus provide no information about older basement.</p></div
Evolution of the Lord Howe Volcano
No full textLord Howe Island (31° 33°S, 159° 05' E), located on the western edge of the Lord Howe Rise, is the remnant of a Miocene (McDougall et al, 1981), subaerial shield volcano at the southern end of the Lord Howe Seamount chain. Lavas in the north dip 5° to the northwest and are cut by sub vertical dykes that strike to the southeast. The lavas in the southern part of the island dip at approximately 3° to the south. The petrography and magnetic fabric suggests the magma in the dykes in the north flowed at a low angle to the northwest. The vent, as inferred from the strike of the dykes, and the dips of the lavas, is located in the southern part of the island to the northeast of Mt Lidgbird. At the maximum size, the Lord Howe Volcano had an average radius of 18km at the base some 2km below sea-level and had a subaerial base radius of approximately 8km and reached an elevation of approximately 1km above sea-level. The volcano had a maximum volume of approximately 1000km3, with both the subaqueous pillow cone and the subaerial shield each having a volume of about 65km3 each. The volcanogenic sediment deposited on the flanks of the volcano had a volume of approximately 870km3 that represents a volume of erupted of approximately 400km3, assuming basalt weathers to twice the volume of the volcanogenic sediments (Sample and Karig, 1982). The difference in volume between the basalt that formed the volcanogenic sediments, pillow and shield cones and the total volume of the volcano is due to the constant erosion and eruption of material over the time the volcano was active (approximately 1 Ma). Estimates of eruption rates and from age constraints of the Lord Howe Basalts it is inferred that the volcano took approximately 0.1Ma to construct the pillow cone, and almost 1Ma to construct the subaerial shield cone. Significant erosion has resulted in the present-day island representing approximately 1 % of the volume of the original subaeial shield. Coastal erosion has occurred at more than 11cm per Ma, while subaerial erosion at 20m per Ma. Geochemically the lavas and dykes (Mg# ~70, D.I. ~32) from Lord Howe Island are similar. Tholeiitic and transitional basalts are dominant with some samples from the youngest rocks in the south being more alkaline. Clinopyroxene compositions of En 46:Fs11:Wo44 are calcic augites and are present as phenocrysts in both the lavas, dykes and an ankaramite sample. The anakaramite contains cumulates of olivine (Fo80) and clinopyroxene. The basalts are classified as continental, intra-plate basalts and are comparable to the ocean island basaltic signatures of eastern Australia.</p
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Magma production along the Lord Howe Seamount Chain, northern Zealandia
No full textOne of the world’s most notable intraplate volcanic regions lies on the eastern Australian plate and includes two age-progressive trails offshore (Tasmantid and Lord Howe seamount chains) and the world’s longest continental hotspot trail (Cosgrove Track). While most studies agree that these chains formed by the rapid northward motion of the Australian plate over a slowly moving mantle source, the volcanic output along these trails, their plate–mantle interactions and the source of the magmatism remain unconstrained. A geophysical mapping and dredging campaign on the RV Southern Surveyor (ss2012_v06) confirmed the prolongation of the Lord Howe Seamount Chain to the South Rennell Trough, ∼200 km further north than previously sampled. Radiometric dating of these new samples at 27-28 Ma, together with previously published results from the southern part of the chain, indicate straightforward northward motion of the Australian plate over a quasi-stationary hotspot as predicted by Indo-Atlantic and Pacific hotspot models. A peak in Lord Howe Seamount Chain magmatism in late Oligocene time, also seen in the Tasmantid and Cosgrove trails, matches a 27-23 Ma slowdown of Australian plate motion. The average magma flux of the Lord Howe hotspot is estimated at 0.4 m3 s-1, similar to rates of crustal production at the South Rennell Trough prior to cessation of spreading in middle Oligocene time, supporting a potential genetic relationship to this spreading system. In addition, plate tectonic modelling suggests that the seamounts and plateaus in the Coral Sea may host the earliest evidence of plume activity in the area
Ex-vivo HRMAS of adult brain tumours: metabolite quantification and assignment of tumour biomarkers
No full textBackground: High-resolution magic angle spinning (HRMAS) NMR spectroscopy allows detailed metabolic analysis
of whole biopsy samples for investigating tumour biology and tumour classification. Accurate biochemical
assignment of small molecule metabolites that are “NMR visible” will improve our interpretation of HRMAS data
and the translation of NMR tumour biomarkers to in-vivo studies.
Results: 1D and 2D 1H HRMAS NMR was used to determine that 29 small molecule metabolites, along with 8 macromolecule signals, account for the majority of the HRMAS spectrum of the main types of brain tumour(astrocytoma grade II, grade III gliomas, glioblastomas, metastases, meningiomas and also lymphomas). Differences in concentration of 20 of these metabolites were statistically significant between these brain tumour types. During the course of an extended 2D data acquisition the HRMAS technique itself affects sample analysis: glycine, glutathione and glycerophosphocholine all showed small concentration changes; analysis of the sample after HRMAS indicated structural damage that may affect subsequent histopathological analysis.
Conclusions: A number of small molecule metabolites have been identified as potential biomarkers of tumour
type that may enable development of more selective in-vivo 1H NMR acquisition methods for diagnosis and prognosis of brain tumours
Determining host plant preferences for the critically endangered Lord Howe Island stick insect (Dryococelus australis) to assist reintroduction
No full textThe Lord Howe Island stick insect (Dryococelus australis) is one of the world’s rarest insects. However, the opportunity to reintroduce the species to Lord Howe Island, and commence the path to recovery, may occur within the next 5 years. Understanding the insect’s host plant and habitat preferences on Lord Howe Island is critical to maximising the likelihood of reintroduction success. However, very little ecological information was documented before the species became extinct on the island in the 1930s. Here we examine the Lord Howe Island stick insect’s preference for potential host plants, a key aspect of habitat suitability. We conducted preference trials using 15 common plant species found on Lord Howe Island. Both nymphs and adults consumed some but not all of these plant species. Nymphs were able to survive on 7 of these 15 plants for the duration of the 26-day trials although failed to survive on some of the plants most preferred by adults. Overall, these data reveal that there are numerous plants on Lord Howe Island that the stick insect can consume, though their suitability varies with different developmental stages of the insect. These data are encouraging for any future reintroduction attempts and would greatly aid the selection and monitoring of release sites
Exploring Emptiness: An Investigation of MA and MU in My Sonic Composition Practice
No full textThe commentary investigates Japanese aesthetics of space, silence and emptiness - ma and mu - that informed my compositional practice during the research period 2012 - 2015. The portfolio comprises text compositions and sound installations in which forms of micro events and sustained events are employed. Throughout, the emphasis is on my personal engagement with, and manifestation of emptiness that concerns a particular model of listening and perception.
Chapter 1 discusses six primary research areas: ma and mu, material, text, form, listening and perception. Firstly, I introduce ma and mu by examining noh culture and Zeami's teaching of senu hima (where there is no-action) in the context of my personal approaches to music. The following subjects are then used to contextualise my PhD practice by means of examples from various composers and visual artists. Here, these particular and enigmatic concepts are explored through Japanese art as well as Western contemporary works by Alvin Lucier, Eliane Radigue and those of the Wandelweiser collective.
Part 2 provides contextual commentaries on selected compositions from the portfolio that mostly articulate my aesthetics in relation to the topics covered in Chapter 1. koso koso addresses my methodologies to investigate the essence of senu hima, followed by treow that discusses my approach to materials and the importance of space. I move on to grade two and grade two extended in order to examine text scores, and then, look into Espèces d'espaces 03 and 04 as examples of musical forms that I employ.
Finally, listening and perception are investigated through the compositions gnome and con.de.structuring. Throughout, I describe how my works explore emptiness as a result of my particular emphasis on listening over composing
[Three pencil doodles on the back of a letter written by B.H. Howe]
No full textB.H. Howe ALS to Friend Puffer, March 31, 1865. Boston, [Ma.], page 3. From a collection of business letters, personal letters, legal documents, and financial records related to an extended family with business and agricultural interests in Massachusetts, New York, Michigan, and South Carolina. Also present are letters from five Civil War soldiers, containing descriptions of their wartime experiences
House Unpassed Legislation 1847, Docket 1910, SC1/series 230, Petition of S.G. Howe [Samuel Gridley Howe?]
No full textPetition subject: Kidnapping Original: http://nrs.harvard.edu/urn-3:FHCL:11005502 Date of creation: (unknown) Petition location: Boston Legislator, committee, or address that the petition was sent to: Francis W. Bird, Walpole; committee on the judiciary Selected signatures:S.G. Howe [Samuel Gridley Howe?]Samuel MayWalter ChanningFrancis JacksonSamuel E. SewallJoseph SouthwickWilliam C. NellThomas T. BouveGeorge William BondTheodore ParkerJohn W. Browne Actions taken on dates: 1847-02-24 Legislative action: Received in the House on February 24, 1847 and referred to the committee on the judiciary Total signatures: 12 Legislative action summary: Received, referred Legal voter signatures (males not identified as non-legal): 12 Female only signatures: No Identifications of signatories: a committee appointed by a meeting at Faneuil Hall on the 24th of September last, committee of vigilance, [males of color] Prayer format was printed vs. manuscript: Manuscript Additional non-petition or unrelated documents available at archive: no additional documents Additional archivist notes: kidnapping Location of the petition at the Massachusetts Archives of the Commonwealth: House Unpassed 1847, Docket 1910 Acknowledgements: Supported by the National Endowment for the Humanities (PW-5105612), Massachusetts Archives of the Commonwealth, Radcliffe Institute for Advanced Study at Harvard University, Center for American Political Studies at Harvard University, Institutional Development Initiative at Harvard University, and Harvard University Library.</p
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