2,209 research outputs found
Trace elements in marine biogenic carbonates: analysis and application to past ocean chemistry
No full textTrace elements in marine biogenic carbonates may be used as proxies for past oceanchemistry provided that there is an established relationship between the trace elementproxy and a parameter of interest, this relationship is preserved within biogeniccarbonate, and the trace element can be determined sufficiently accurately. Successfulapplication of any trace element proxy requires both development of the analyticalmethodology to ensure accurate data with the necessary sensitivity, and anunderstanding of the relationship between proxy and seawater chemistry.Herein I develop methods for the determination of Mg/Ca, Sr/Ca and Cd/Ca inplanktonic foraminiferal calcite, using inductively coupled plasma optical emissionspectrophotometry and isotope dilution thermal ionisation mass spectrometry, andpropose a potential reference material for Mg/Ca in foraminiferal calcite. The developedtechniques are applied to an investigation of the Mg/Ca temperature proxy overChatham Rise in the Southwest Pacific Ocean and a calibration study of the partitioncoefficient, DCd, for cadmium incorporation into planktonic foraminifera.Comparisons of planktonic foraminiferal Mg/Ca, shell weight and oxygenisotope records from sites north and south of the Subtropical Front on Chatham Rise,demonstrate the effects of hydrography, foraminiferal habitat and dissolution as controlson Mg/Ca. Determinations of Cd/Ca in seven species of planktonic foraminiferaconfirm that the dominant controls on Cd/Ca are foraminiferal habitat and hydrography,with only a minor influence of post depositional dissolution. The major uncertainty indetermination of DCd from core top samples comes from uncertainty in estimation of thedepth distribution and seasons of calcification of planktonic foraminifera
Plan of farms... Parish of Great Marlow, Clarence River, N.S.W. [cartographic material] /
No full text"For sale by auction at the Land Sales Rooms, 423 George St. by T.W. Bowden on Monday & Tuesday the 17th & 18th of June 1861.; Map 437 from Ferguson Collection.; Sales plan for farms near Clarence River, N.S.W.; Also available in an electronic version via the Internet at: http://nla.gov.au/nla.map-f437
Cancer cell transmission via the placenta
No full textCancer cells have a parasitic propensity in the primary host but their capacity to transit between individuals is severely restrained by two factors: a lack of a route for viable cell transfer and immune recognition in allogeneic, secondary recipients. Several examples of transmissible animal cancers are now recognised. In humans, the only natural route for transmission is via the haemochorial placenta which is permissive for cell traffic. There are three special examples of this occurring in utero: maternal to foetus, intraplacental twin to twin leukaemias and choriocarcinoma-extra-embryonic cells to mother. We discuss the rare circumstances under which such transmission occurs
Plan of the attack on the Katikara pak shewing the positions of the troops &c, June 4th 1863 [cartographic material] /
No full textFrom: The Maori Wars, New Zealand, original and engraved maps, 1863-4. [Melbourne? : s.n., 1870?]; Includes handwritten notes describing the attack on the Maoris at Katikara.; Map of the Katikara River area during the second Taranaki campaign showing 57th Regiment advancing to position at daylight, route of the 57th Regiment under Col. Warre crossing the Katikara River, route of the 70th Regiment (Reserve) under Lt-Gen. Cameron advancing to redoubt and advance of the 65th and 70th Regiments.; Also available in an electronic version via the Internet at: http://nla.gov.au/nla.map-ra148-1.The war in AucklandThe Maori Wars, New Zealand, original and engraved maps, 1863-4
AIDS and the Black Community 1st National Conference, May 1986
No full textDr. Wayne Greaves is shown speaking at the 1st National AIDS and the Black Community Conference while Dr. David Williams, Evelyn G. Lowery, Dr. Huey Mays, Dr. Lawrence Sanders, and Elfreda Stanley listen. For more details on the conference, see pages 42-45 of the August-September 1986 SCLC Magazine: http://hdl.handle.net/20.500.12322/auc.199:07030.The Atlanta University Center Robert W. Woodruff Library acknowledges the generous support of the Joseph & Evelyn Lowery Institute for Justice and Human Rights, the Joseph Echols Lowery Irrevocable Trust, and other donors in supporting the processing and digitization of Morehouse College's Joseph Echols and Evelyn Gibson Lowery Collection
Spacetime symmetries and the CPT theorem
No full textThis dissertation explores several issues related to the CPT theorem.
Chapter 2 explores the meaning of spacetime symmetries in general and time reversal in particular. It is proposed that a third conception of time reversal, 'geometric time reversal', is more appropriate for certain theoretical purposes than the existing 'active' and 'passive' conceptions. It is argued that, in the case of classical electromagnetism, a particular nonstandard time reversal operation is at least as defensible as the standard view. This unorthodox time reversal operation is of interest because it is the classical counterpart of a view according to which the so-called 'CPT theorem' of quantum field theory is better called 'PT theorem'; on this view, a puzzle about how an operation as apparently non-spatio-temporal as charge conjugation can be linked to spacetime symmetries in as intimate a way as a CPT theorem would seem to suggest dissolves.
In chapter 3, we turn to the question of whether the CPT theorem is an essentially quantum-theoretic result. We state and prove a classical analogue of the CPT theorem for systems of tensor fields. This classical analogue, however, appears not to extend to systems of spinor fields. The intriguing answer to our question thus appears to be that the CPT theorem for spinors is essentially quantum-theoretic, but that the CPT theorem for tensor fields applies equally to the classical and quantum cases.
Chapter4 explores a puzzle that arises when one puts the CPT theorem alongside a standard way of understanding spacetime symmetries, according to which (latter) spacetime symmetries are to be understood in terms of background spacetime structure. The puzzle is that a 'PT theorem' amounts to a statement that the theory may not make essential use of a preferred direction of time, and this seems odd. We propose a solution to that puzzle for the case of tensor field theories.Ph.D.Includes bibliographical references (p. 102)
Australian Author Marion Halligan - Word Artist
No full textAustralian author Marion Halligan admits that her life has been 'centred in domesticity' and this is where she draws on much of the material for her fiction. This could also be a reason why her work has been critically overlooked. Halligan is adept at capturing details of life in the domestic realm and weaving poignant, thought-provoking stories about experiences all of us can recognise in our own lives. It does not take the discerning reader long to discover the deeper considerations in her writing. According to Halligan, 'the world is a cruel and dark and difficult place and it is words that light the small candle flames that keep the dark at bay'[1]. Words and writing are essential to Halligan's life. In an essay titled 'Why I Write', she says: 'I write in order to put the world into words. I've always done that in my head. I can't perceive anything without trying to find words for it'[2]. Halligan's writing is an evocative exploration of the human condition. For Halligan, 'it is artists showing you what they see that educates the heart, in novels, in paintings, in photographs'.[3] The following essay examines three of Halligan's novels which feature an artist protagonist who is struggling to come to terms with the experience of loss, grief and bereavement. Lovers' Knots (1992), The Golden Dress (1998) and The Fog Garden (2001) are rich evocations of lives which are 'a walk with love and death ... The same subjects as the Greeks, and Shakespeare. [The] characters aren't kings and queens, aren't noble and grand, but their passions are as real'[4]
Underperforming policy networks : the biopesticides network in the United Kingdom
No full textLoosely integrated and incomplete policy networks have been neglected in the literature. They are important to consider in terms of understanding network underperformance. The effective delivery and formulation of policy requires networks that are not incomplete or underperforming. The biopesticides policy network in the United Kingdom is considered and its components identified with an emphasis on the lack of integration of retailers and environmental groups. The nature of the network constrains the actions of its agents and frustrates the achievement of policy goals. A study of this relatively immature policy network also allows for a focus on network formation. The state, via an external central government department, has been a key factor in the development of the network. Therefore, it is important to incorporate such factors more systematically into understandings of network formation. Feedback efforts from policy have increased interactions between productionist actors but the sphere of consumption remains insufficiently articulated
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