491 research outputs found
Carius, L R, 414622
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/375964Surname: CARIUS. Given Name(s) or Initials: L R. Military Service Number or Last Known Location: 414622. Missing, Wounded and Prisoner of War Enquiry Card Index Number: 52761.256741
Item: [2016.0049.08272] "Carius, L R, 414622
Stemmops carius Marques & Buckup 1996
No full textStemmops carius Marques & Buckup, 1996 Figs. 18, 19, 26 New records: BRAZIL. São Paulo: Iporanga, Petar, 24°32’S– 48°40’W, 8–15.XI.2001, E. S. S. Álvares leg., night manual collection, 1F (IBSP 215210).Published as part of Santanna, Manoela & Rodrigues, Everton Nei Lopes, 2018, Five new species and new records of the spider genus Stemmops (Araneae, Theridiidae, Spintharinae) from Brazil, pp. 174-186 in Zootaxa 4524 (2) on page 181, DOI: 10.11646/zootaxa.4524.2.2, http://zenodo.org/record/261041
Evaluation of a technique for determining Re and PGEs in geological samples by ICP-MS coupled with a modified Carius tube digestion
No full textIn the determination of Re and platinum group elements in geological samples, various techniques have been employed for digesting samples, including Carius tube, high-pressure asher (HPA-S), alkali fusion and nickel sulfide fire assay. The normal Carius tube technique is able to digest relatively small amount of sample and has a possible safety problem caused by a high internal pressure. This paper reports a modified Carius tube method which utilizes a sealed stainless steel high-pressure autoclave filled with water to prevent explosion of the tube. During heating, the external and internal pressures of the Carius tube increase simultaneously, such that the possible explosion of Carius tube can be avoided. Consequently, this technique allows a higher temperature (up to 330°C), a greater volume of aqua regia (up to 2/3 of the total volume of the Carius tube) and thus larger sample mass (12 g) relative to the normal Carius tube technique. Fairly good agreement were obtained for PGE poor mafic rocks (IPGE < 0.03 ng/g). The efficiency to dissolve ultramafic rocks and chromites at different temperatures was investigated. We demonstrate that this technique is more effective than normal Carius tube technique for ultramafic rocks and chromites containing refractory minerals and the detection limits and precision can be improved for PGE poor mafic samples. The total procedural blanks are lower than 0.003 ng for Os, 0.03 ng for Re, Ir, Ru and Rh and 0.4 ng for Pd and Pt. Copyright © 2007 by The Geochemical Society of Japan.link_to_subscribed_fulltex
An improved Carius tube technique for determination of low concentrations of Re and Os in pyrites
No full textA simple and highly selective analytical method is developed for Re-Os dating in hydrothermal pyrites. Pyrites were first digested with HNO 3 in a 120 ml Carius tube. The released additional gas and a small portion of volatile Os (∼6% of total Os) were collected by 10 mol l -1 of HCl in an ice-water bath. After the sulfides were totally reacted with HNO 3, the HCl solution containing all the released Os was transferred back to the Carius tube. The sample was further digested in aqua regia at 200 °C for about 10 h in a sealed Carius tube. Because prior digestion in an open Carius tube removed the additional gas, this improved technique allows increasing the sample mass to about 3 g, which is vital for Re-Os dating in Re and Os poor hydrothermal pyrites. Os was separated from the matrix by distillation and Re by anion exchange resin. The results obtained for molybdenite reference materials, JDC and HLP mixed with 3 g pyrite are in good agreement with certified values. Despite very low concentrations of Re and Os, the pyrite yields excellent repeatability and can be used for Re and Os poor hydrothermal pyrites. © 2010 The Royal Society of Chemistry.link_to_subscribed_fulltex
Improvement of Open Circuit Voltage in Microcrystalline Silicon Solar Cells Using Hot Wire Buffer Layers
No full textMai Y, Klein S, Carius R, et al. Improvement of Open Circuit Voltage in Microcrystalline Silicon Solar Cells Using Hot Wire Buffer Layers. J. Non-cryst. Solids. 2006;352(9-20):1829-1831
Open circuit voltage improvement of high-deposition-rate microcrystalline silicon solar cells by hot wire interface layers
No full textMai Y, Klein S, Carius R, Stiebig H, Geng X, Finger F. Open circuit voltage improvement of high-deposition-rate microcrystalline silicon solar cells by hot wire interface layers. Applied Physics Letters. 2005;87(7):073503.Significant improvement in open circuit voltage and fill factor was achieved for microcrystalline silicon (mu c-Si:H) solar cells deposited by plasma-enhanced chemical vapor deposition (PECVD) by the incorporation of an intrinsic mu c-Si:H p/i buffer layer fabricated by hot-wire (HW) CVD. The improved p/i interface quality, likely due to the ion-free deposition on the p layers in the HWCVD process, was concluded from a considerably enhanced blue light response in such solar cells. Using this buffer layer concept allows the authors to apply high deposition rate PECVD processes for the mu c-Si:H i layer material, yielding a high efficiency of 10.3% for a single junction mu c-Si:H solar cell. (C) 2005 American Institute of Physics
Optical characteristics of intrinsic microcrystalline silicon
No full textJun KH, Carius R, Stiebig H. Optical characteristics of intrinsic microcrystalline silicon. Phys. Rev. B. 2002;66(11): 115301.We studied the optical properties of intrinsic microcrystalline silicon (muc-Si:H) deposited by very high frequency plasma-enhanced chemical-vapor deposition system at different silane concentrations (SC) by spectroscopy ellipsometry and photothermal deflection spectroscopy. The bulk property of the samples was probed because the impact of the surface layer was significantly reduced by mechanical polishing. At high SC, we extracted the optical characteristics of the disordered part by assuming a superposition of ideal c-Si and mathematically generated amorphous function. At low SC, we studied the reason for a large deviation of absorption coefficient in the energy range between 1.6 and 3.2 eV from the value predicted by effective medium theory. We considered the scattering loss by the inhomogeneity of muc-Si:H and introduce the dense medium radiative transfer formalism to an optical scattering simulation. We simulated the Stokes vector of p- and s-polarized light at oblique incidence. From this formalism, we could predict depolarization of p and s wave by scattered incoherent light. Further, we also suggested strain effect as the second possible reason for the enhanced absorption near the onset of the indirect transition in highly crystalline muc-Si:H
Determination of platinum-group elements in OPY-1: Comparison of results using different digestion techniques
No full textA new proficiency testing sample, OPY-1 (ultramafic rock), the basis of the twentieth international proficiency test of analytical geochemistry laboratories (Geo PT 20), was recently prepared by the International Association of Geoanalysts (IAG). This paper reports analytical data for Os, Ir, Ru, Rh, Pt and Pd with different digestion techniques, including an improved Carius tube, Carius tube combined with HF dissolution and alkaline fusion. About 4-15% of the PGEs are in the silicate phase, which cannot be leached by aqua regia even when digested at 300 °C with the Carius tube technique. Both the Carius tube technique combined with HF dissolution and alkaline fusion can obtain reliable data. The results demonstrated that OPY-1 is sufficiently homogeneous at a 2 g test portion level to be suitable as a reference material for method validation. The procedure for sealing the Carius tube was simplified and the recommended digestion procedures are provided. © 2008 The Authors. Journal compilation © 2008 International Association of Geoanalysts.link_to_subscribed_fulltex
Institutional Assessment of Transboundary Water Resources Management
No full texthuman development, water, sanitation
Development ICP-MS isotope dilution preconcentration techniques for determination of platinum group elements in volcanic rocks
No full textUnderstanding PGE geochemistry in low abundance (i.e. sub ppb level) geological samples has been hampered by the absence of an accurate, low blank, preconcentration technique. Ni- S fire assay, the traditional preconcentration method, has been critically assessed and combined with isotope dilution to enable reproducible analysis of standards in the 1-l0ppb concentration range. In addition, a new anion exchange chromatography, low blank, isotope dilution method has been developed that allows analysis of Re, Os, Ir, Ru, Ft and Pd, at pg levels, from the same sample aliquot by ICP-MS. This method enables PGE abundances and Os isotopic ratios to be determined on the same sample dissolution, permitting geochronological studies. Samples are digested in Carius tubes and total procedural blanks are routinely less than l0pg/g for all elements, except Pt (25pg/g). Reproducibility is sufficient at the lOppt level to confidently identify inter-element PGE fractionations. Using this anion exchange preconcentration technique, PGEs have been characterised in a suite of plume-generated picrites from West Greenland, and a suite of subduction-related lavas, including fractionation series from Grenada (Lesser Antilles arc) and from Izu-Bonin. PGE concentrations are higher within the picrites of West Greenland, than in the picrites of Grenada, or boninites of Izu-Bonin. This is attributed to higher degrees of melting and less fractionation during West Greenland magma genesis. There is similarity in the PGE-pattems between all environments suggesting that relative PGE behaviour is not greatly altered during mantle melting in a subduction zone vs a plume. Subtle differences occur in inter-PGE ratios between the different environments and within the fractionation suites. Os and Ir do not behave in an analogous manner during fractionation indicating "compatibility" with different crystallising phases. The PGEs are associated with olivine fractionation in all of the primitive rock types, but, may also be compatible with other phases (e.g. magnetite/chromite/amphibole) during high-level fractionation in arc magma chambers. The PGE signatures in the evolved arc rocks are controlled by multi-stage fractionation. PGE concentrations decrease as fractionation progresses, except for Re and Ru. PGE compatibility during arc-lava fractionation decreases in the order Os>Ir>Pt>Pd>Ru>Re. There is not a strong sulfide control on PGE fractionation in any of the rock suites analysed, probably because the primary melts were generally S- undersaturated. This places important constraints on the nature of the mantle in the different tectonic environments. Os-isotopic studies indicate the presence of a radiogenic component in both the West Greenland picrite plume source region (recycled crust or outer core material) and the Grenada picrite source region (slab-derived fluids)
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