353 research outputs found
A Roundtable for Victoria M. Grieve, Little Cold Warriors: American Childhood in the 1950s
No full textDr. Thomas Field introduces a roundtable discussion of Victoria M. Grieve\u27s Little Cold Warriors: American Childhood in the 1950s, providing a synopsis of reviewer critiques before the reviewers expand on their views and the author responds
Advances in Neuroimaging and Monitoring to Defend Cerebral Perfusion in Noncardiac Surgery
No full textNoncardiac surgery conveys a substantial risk of secondary organ dysfunction and injury. Neurocognitive dysfunction and covert stroke are emerging as major forms of perioperative organ dysfunction, but a better understanding of perioperative neurobiology is required to identify effective treatment strategies. The likelihood and severity of perioperative brain injury may be increased by intraoperative hemodynamic dysfunction, tissue hypoperfusion, and a failure to recognize complications early in their development. Advances in neuroimaging and monitoring techniques, including optical, sonographic, and magnetic resonance, have progressed beyond structural imaging and now enable noninvasive assessment of cerebral perfusion, vascular reserve, metabolism, and neurologic function at the bedside. Translation of these imaging methods into the perioperative setting has highlighted several potential avenues to optimize tissue perfusion and deliver neuroprotection. This review introduces the methods, metrics, and evidence underlying emerging optical and magnetic resonance neuroimaging methods and discusses their potential experimental and clinical utility in the setting of noncardiac surgery
Exochaenium natalense Kissling & K. W. Grieve
No full text<i>Exochaenium natalense</i> (Schinz) Kissling & K.W.Grieve, <i> <i>combinatio nova</i>.</i> <p> <i>Basionym</i>:— <i>Belmontia natalensis</i> Schinz (1894: 220).</p> <p> <i>Homotypic synonyms</i>:— <i>Exochaenium grande</i> var. <i>homostylum</i> Hill (1908: 338).</p> <p> <i>Sebaea natalensis</i> (Schinz) Schinz (1906:782), <i>nom. illeg.</i> [non <i>Sebaea natalensis</i> Schinz (1896:442)].</p> <p> Type:— SOUTHAFRICA. KwaZulu-Natal, Clairmont, 5 Aug. 1893, <i>Schlechter 3060</i> (Lectotype Z [Z000070706]!, <i>hic designatus</i>; isolectotype Z [Z000070705]!).</p> <p> <b>Nomenclatural notes:</b> —There are two sheets of <i>Schlechter 3060</i> at Herb. Z. One [Z000070706] contains five stems each with a single flower, whereas the other [Z000070705] contains a single stem from which the flower is removed and stored in a pocket. These two specimens should be considered as duplicates and thus a lectotype needed to be chosen, in accordance with the <i>International Code of Nomenclature for algae, fungi and plants</i> Arts 8.2 and 8.3 (Turland <i>et al.</i> 2018). The first author (JK) has studied the type material in detail and confirmed that both sheets represent the same taxon. The sheet with five stems contains more and better material and is consequently chosen here as lectotype.</p> <p> When Schinz transferred <i>Belmontia natalensis</i> to the genus <i>Sebaea</i> in 1906, he clearly forgot that he had already described a different and currently still accepted species, as <i>Sebaea natalensis</i> in 1896. Thus, should <i>Exochaenium natalense</i> ever be transferred to the genus <i>Sebaea</i>, it will need a new name.</p> <p> <b>Diagnosis:</b> —This species is morphologically closely allied to <i>Exochaenium grande</i> (E.Mey.) Griseb., but is markedly different in terms of its much smaller flower size of <i>c.</i> 0.8–1.5 cm diameter (<i>vs c.</i> 3.0– 4.5 cm for <i>E. grande</i>) and the arrangement of the reproductive organs, with anthers positioned at the same level as the stigma (<i>vs</i> distyly in <i>E. grande</i>), possibly indicating differences in pollination strategies. The species can also be differentiated on the basis of their ecological preferences.</p> <p> <b>Description:</b> —Annual, erect herbs, 15–20 cm tall. <i>Stems</i> simple, rarely branched from base, sometimes branched above, 4-ridged. <i>Leaves</i> sessile, opposite, 7–20 mm long, 3–6 mm broad, lanceolate, acute at apex, base narrowed, margin entire, basal leaves sometimes reduced. <i>Inflorescence</i> corymbose, lax, single to several flowered. <i>Calyx</i> of 4 or 5 free sepals, each 7–16 mm long, 3–5 mm broad, ovate-lanceolate, acuminate, with conspicuous keel-wing, 2–3 mm broad at semi-cordate base, hyaline, presence of colleters on inside base. <i>Corolla</i> pure white; tube 9.0– 14.5 mm long, infundibuliform; corolla lobes suborbicular, 5.0– 8.5 mm long, 4–5 mm broad, margins entire, apex acuminate. <i>Stamens</i> inserted ± half way up tube, at same level as stigma. <i>Filaments</i> 6.0– 9.5 mm long; <i>anthers</i>, <i>c.</i> 1–2 mm long, each with apical and 2 tiny stipitate basal glands. <i>Ovary</i> ovoid, <i>c.</i> 2–6 × 2–4 mm, bilocular, placentation axile, ovules numerous. <i>Style</i> and <i>stigma</i> 4–18 mm long, filiform. <i>Stigma</i> slightly clavate, papillose. <i>Fruit</i> and <i>seed</i> not seen.</p> <p> <b>Iconography:</b> — Hill (1908: 317, plate G). See also drawing accompanying plate K000195293 (<i>J.M.Wood 541</i>) from Royal Botanic Gardens Kew.</p> <p> <b>Distribution:</b> —This species occurs along a section of the eastern coastal region of South Africa. It is found mainly in the Port Edward district, on the border between the Eastern Cape and southern KwaZulu-Natal, South Africa. The range extends northwards to Port Shepstone (Oribi Flats) and uMzinto districts in KwaZulu-Natal. There are historical records from the greater eThekwini [Durban] area and Zululand, localities that have been transformed by urban development and agriculture. The species has been observed by the second and third authors along the eastern seaboard of the Eastern Cape, known as the Pondoland coast, between Port St Johns and the Umtamvuna River, although no specimens have been collected from this region as yet.</p> <p> <b>Ecology and habitat:</b> — The species inhabits the Indian Ocean Coastal Belt biome, in particular Pondoland-Ugu Coastal Sourveld (CB4) and KwaZulu-Natal Coastal Belt Sandstone Sourveld (CB3) (Mucina & Rutherford 2006). These vegetation types are characterised by undulating coastal plains, species-rich grasslands, rocky outcrops and forested gullies, at elevations up to 600 m. The area receives mostly summer rainfall with some rain in winter.</p> <p> <i>Exochaenium natalense</i> and <i>E. grande</i> occur sympatrically although the latter has a much wider distribution. The two species also have different ecological preferences—whereas <i>E. grande</i> is usually found in well drained grassland, <i>E. natalense</i> is always found in seasonally wet to moist grassland (sometimes even in water).</p> <p> <b>Etymology:</b> —This taxon was named by Schinz (1894), after its geographical origin, previously named Natal and now KwaZulu-Natal, in South Africa.</p> <p> <b>Conservation status:</b> —This species has a restricted distribution and is endemic to the southwestern region of KwaZulu-Natal. A small part of the region is statutorily conserved and the rest is transformed by agriculture and subsistence farming, infrastructure development and urban sprawl and for these reasons, the area is regarded as being of conservation concern (Mucina & Rutherford 2006). <i>Exochaenium natalense</i> is a habitat specialist and is fairly uncommon within this region of <i>c.</i> 1230 km 2. Because the extent of occurrence of the species is estimated to be less than 5000 km 2, based on historical collections and the authors’ observations, and because populations seem to be fragmented, and population decline is projected due to habitat loss and degradation, it is suggested that this species should be regarded as Endangered: B1ab(i–iv).</p> <p> <b>Representative specimens examined:</b> — SOUTH AFRICA. KwaZulu-Natal: Eisdumbeni, 1800 ft., <i>J.M.Wood 133</i> (K [K000195293], NH [NH0004093 -0]); [Durban] “ Bei Port Natal ”, 28 Mar. 1832, <i>J.F.Drège s.n.</i> (P [P00560847]); [Durban] Fields Hill, 358m,n.d., <i>H.Evans 190</i> (NH); Inanda,[Durban district],[252m], <i>J.M.Wood 541</i> (K [K000195293], NH [NH0002056-0]); Izinqoleni district: Kwazamane, 394 m, 21 Mar. 2019, <i>K.W.Grieve 2841</i> (PRE); Margate, [114 m], 4 Feb. 1987, <i>H.B.Nicholson 2561</i> (PCE [PCE0005454]); Mvoti kloof, Canema estate, 7 Oaks, [2930BA], 20 Jan. 1990, <i>A.Abbott 4999</i> (PCE [PCE0005472], NH); Oribi, [432 m], Apr.1937, <i>A.McClean 442</i> (NH); Paddock district, Oribi Flats, Whistling Pine Farm, 482 m, 25 Jan. 2017, <i>K.W.Grieve 2295</i> (PCE [PCE0014180]); Port Edward, Red Desert Nature Reserve coastal section, 10 m, 8 Dec. 2015, <i>K.W.Grieve 1886</i> (NU [NU0088250]); Port Edward, Red Desert Nature Reserve coastal section, 17 m, 23 Feb. 2017, <i>K.W.Grieve 2322</i> (PCE [PCE0014181]); Port Edward, Red Desert Nature Reserve coastal section, 24 m, 6 Jan. 2022, <i>K.W.Grieve 3078</i> (NH); Port Edward, Izingolweni roadside, [3130AA], 2 Jan. 1965, <i>O.M.Hilliard 3038</i> (NU [NU0092021]); Port Edward, Umtamvuna Nature Reserve, [350 m], 14 Apr. 1982, <i>H.B.Nicholson 2248</i> (PCE [PCE0005455]); Port Edward, Umtamvuna Nature Reserve, Clearwater, [350 m], 3 Mar. 1983, <i>A.Abbott 880</i> (PCE [PCE0005451]); Port Edward, Umtamvuna Nature Reserve, [350 m], 13 Mar. 1984, <i>A.Abbott 1827</i> (NH, PCE [PCE0005450]); Port Edward, Umtamvuna Nature Reserve, Office [Beacon Hill], [350 m], 12 Feb. 1986, <i>A.Abbott 2982a</i> (NH, PCE [PCE0005449]); Port Edward, Umtamvuna Nature Reserve, [350 m], 31 Mar. 1995, <i>A.Abbott 6740</i> (NH); Port Edward, Umtamvuna Nature Reserve, Beacon Hill, [350 m], 2 Mar. 1997, <i>C.J.Potgieter s.n.</i> (NU [NU0092023]); Port Edward, Umtamvuna Nature Reserve, western heights, 365 m, 9 Feb. 2017, <i>K.W.Grieve 2306</i> (PCE [PCE0014179]); uMzinto district, Vernon Crookes Nature Reserve, 449 m, 7 Feb. 2019, <i>K.W.Grieve 2801</i> (PCE [PCE0013839]); Uvongo sandflats, [19 m], 19 Dec. 1965, <i>R.Strey 6181</i> (NH); Zululand, Hlabisa district, Lake St Lucia, east shore [2832AB], 5–10 m, 30 Apr. 1974, <i>R.H.Taylor 175</i> (NU [NU0092020]); Zululand, Lake Nhlabane, 5 Jan. 1992, <i>C.J.Ward & A.Rajh 11674</i> (UDW [UDW13406]); Zululand, “ N’goya ” [oNgoye, 2831DD], 1000–2000 ft., 18 Mar. 1904, <i>J.M.Wood 9322</i> (K [K000195292]).</p>Published as part of <i>Kissling, Jonathan, Grieve, Kate W., Grieve, Graham & Bytebier, Benny, 2023, Exochaenium natalense (Gentianaceae), a reinstated taxon endemic to KwaZulu-Natal, South Africa, pp. 117-122 in Phytotaxa 619 (1)</i> on pages 120-121, DOI: 10.11646/phytotaxa.619.1.8, <a href="http://zenodo.org/record/8425836">http://zenodo.org/record/8425836</a>
Christopher Murray Grieve alias Hugh MacDiarmid (1892-1978)
No full textThis article presents an overview on the fabulous career of the protagonist of the Scottish literary Renaissance through some of his masterpieces. Here the author analyzes the way in which Murray Grieve made up for himself the famous pseudonym of Hugh MacDiarmid and how he used it all through the various decades until his death in 1978. Various works are here discussed, such as: some of his first Scots poems, the long poem On a Raised Beach, etc
How does grid-resolution modulate geomorphic processes: data
No full textIn many locations, our ability to study the processes which shape the Earth are greatly enhanced through the use of high resolution digital topographic data. However, although the availability of such datasets has markedly increased in recent years, many locations of significant geomorphic interest still do not have high resolution topographic data available. Here, we aim to constrain how well we can understand surface processes through topographic analysis performed on lower resolution data. We generate digital elevation models from point clouds at a range of grid resolutions from 1 to 30 meters, which covers the range of widely used data resolutions available globally, at three locations in the United States. Using these data, the relationship between curvature and grid resolution is explored, alongside the estimation of the hillslope sediment transport coefficient (, in m yr) for each landscape. Curvature, and consequently , values are shown to be generally insensitive to grid resolution, particularly in landscapes with broad hilltops and valleys. Curvature distributions, however, become increasingly condensed around the mean, and theoretical considerations suggest caution should be used when extracting curvature from landscapes with sharp ridges. The sensitivity of curvature and topographic gradient to grid resolution are also explored through analysis of one dimensional approximations of curvature and gradient, providing a theoretical basis for the results generated using two dimensional topographic data. Two methods of extracting channels from topographic data are tested. A geometric method of channel extraction that finds channels by detecting threshold values of planform curvature is shown to perform well at resolutions up to 30 meters in all three landscapes. The landscape parameters of hillslope length and relief are both successfully extracted at the same range of resolutions. These parameters can be used to detect landscape transience and our results suggest that such work need not be confined to high resolution topographic data. A synthesis of the results presented in this work indicate that although high resolution (e.g., 1 m) topographic data does yield exciting possibilities for geomorphic research, many key parameters can be understood in lower resolution data, given careful consideration of how analyses are performed. Data sourced from OpenTopography.org.See README.tx
A photovoltaic training facility on the Murdoch University engineering and energy building's north east roof
No full textMurdoch University’s School of Engineering and Energy is expanding its facilities to include a, total of 8.2kWp, Photovoltaic (PV) Training Facility. This facility has incorporated four types of PV modules and equipment, including mono-crystalline, poly-crystalline, amorphous, and copper indium gallium selenide thin film modules; isolated, high frequency isolated, and transformerless inverters; AC and DC test points; emergency stop button system and other safety devices; a battery bank, and power meters.
These facilities will provide a versatile educational resource for students to analyse the behaviours of a wide variety of PV technologies.
This project has examined the process of writing an Invitation To Offer (ITO), reviewing the ITO with recommendations for future engineering projects, and detailing changes in the design of the systems as the project developed.
A recommendation has been detailed in this project for the inclusion of a PV monitoring station, which should monitor environmental parameters at the PV site.
A manual and simulated performance ratio (PR) of all PV systems has been examined in this project. The manual estimate calculated a PR of 0.739 over the period of a year. For the simulated PR, PVSYST software was programmed and calculated a yearly PR of 0.745. This modelling indicates that the system performance would be comparable to similar systems in Perth
sj-pdf-2-hpi-10.1177_11207000211038550 – Supplemental material for Which hip morphology measures and patient factors are associated with age of onset and symptom severity in femoroacetabular impingement syndrome?
No full textSupplemental material, sj-pdf-2-hpi-10.1177_11207000211038550 for Which hip morphology measures and patient factors are associated with age of onset and symptom severity in femoroacetabular impingement syndrome? by Nicholas J Murphy, Laura E Diamond, Kim L Bennell, Alexander Burns, Edward Dickenson, Jillian Eyles, Camdon Fary, Stuart M Grieve, Damian R Griffin, Young Jo Kim, James M Linklater, David G Lloyd, Robert Molnar, Rachel L O’Connell, John O’Donnell, Sunny Randhawa, Parminder J Singh, Libby Spiers, Phong Tran, Tim Wrigley and David J Hunter in HIP International</p
sj-pdf-1-hpi-10.1177_11207000211038550 – Supplemental material for Which hip morphology measures and patient factors are associated with age of onset and symptom severity in femoroacetabular impingement syndrome?
No full textSupplemental material, sj-pdf-1-hpi-10.1177_11207000211038550 for Which hip morphology measures and patient factors are associated with age of onset and symptom severity in femoroacetabular impingement syndrome? by Nicholas J Murphy, Laura E Diamond, Kim L Bennell, Alexander Burns, Edward Dickenson, Jillian Eyles, Camdon Fary, Stuart M Grieve, Damian R Griffin, Young Jo Kim, James M Linklater, David G Lloyd, Robert Molnar, Rachel L O’Connell, John O’Donnell, Sunny Randhawa, Parminder J Singh, Libby Spiers, Phong Tran, Tim Wrigley and David J Hunter in HIP International</p
Right ventricular energetics and power in pulmonary regurgitation vs. stenosis using four dimensional phase contrast magnetic resonance
No full textLSDDrainageDensity v1.0
No full text<p>This software contains all the routines necessary to analyse drainage density of a landscape from digital elevation models. It can be used to reproduce the results of Clubb et al., 2016.</p>
<p>Software is part of the Edinburgh Land Surface Dynamics Topographic Tools package. For more information on download and installation please see our website.</p>
<p>Citation: Clubb, F. J., S. M. Mudd, M. Attal, D. T. Milodowski, and S. W. D. Grieve (2016), The relationship between drainage density, erosion rate, and hilltop curvature: Implications for sediment transport processes, J. Geophys. Res. Earth Surf., 121, 1724–1745, doi:10.1002/2015JF003747.</p>
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