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  • 1
    facet.materialart.
    Unknown
    PANGAEA
    In:  Supplement to: Sarna-Wojcicki, Andrei M; Meyer, C E; Roth, Peter H; Brown, F H (1985): Ages of tuff beds at East African early hominid sites and sediments in the Gulf of Aden. Nature, 313(6000), 306-308, https://doi.org/10.1038/313306a0
    Publication Date: 2023-06-27
    Description: The early hominids of East Africa were dated by determining the ages of tuff beds at the sites. Despite much research using palaeomagnetic and K/Ar-dating techniques, some of those ages are still controversial (Brown, 1982, doi:10.1038/300631a0; Aronoson et al., 1983, doi:10.1038/306209c0). To obtain independent age estimates for these tephra layers, we have examined cores from DSDP Sites 231 and 232 in the Gulf of Aden which consist mainly of calcareous nannofossil ooze, but also contain rare tephra horizons (Brunce and Fisher, 1974, doi:10.2973/dsdp.proc.24.101.1974) dated by interpolation from the established nannofossil stratigraphy. Chemical analysis confirms that the identity and sequence of these horizons is the same as that at the East African sites. We conclude that the age of the Tulu Bor Tuff is 〈3.4 Myr and hence that the Hadar hominid specimens are also 〈~3.4 Myr old.
    Keywords: 24-231; 24-232A; Aluminium oxide; Aluminium oxide, standard deviation; Calcium oxide; Calcium oxide, standard deviation; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Electron microprobe (EMP); Event label; Glomar Challenger; HAND; Indian Ocean/Gulf of Aden/BASIN; Indian Ocean/Gulf of Aden/TRENCH; Iron oxide, Fe2O3; Iron oxide, Fe2O3, standard deviation; Kenya; Leg24; Magnesium oxide; Magnesium oxide, standard deviation; Manganese oxide; Manganese oxide, standard deviation; Number; Potassium oxide; Potassium oxide, standard deviation; Sample amount; Sample code/label; Sample comment; Sampling by hand; Silicon dioxide; Silicon dioxide, standard deviation; Sodium oxide; Sodium oxide, standard deviation; Titanium dioxide; Titanium dioxide, standard deviation; Total; Turkana_Basin
    Type: Dataset
    Format: text/tab-separated-values, 364 data points
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  • 2
    Publication Date: 2024-07-01
    Description: Based on comparative studies on the utility of ICP, atomic absorption, and other techniques for the elemental analysis of geological samples the authors decided to pursue a scheme of analysis based primarily around the induction coupled plasma atonic emission spectrometry (ICP) technique because of its simultaneous multielement capability and its relatively large linear concentration range. Atomic Absorption techniques are used only for those elements where the sensitivity, precision, or accuracy of the ICP technique are not sufficient for the determination. The elements Cu, Ni, Mo, Sr, V, Y, Cr, Ba, Co, and P were determined by ICP spectrometry, K, Pb, and Zn by FAA spectrometry and Cr by Zeeman GFAA spectrometry on a concentrated solution of 100mg sample dissolved into 3 mL HN03, 1 mL HC104 and 10 mL HF. Mn, Ti, Al, Fe, Mg and Ca is determined by ICP spectrometry and Cd by Zeeman GFAA spectrometry on a dilution of the previous solution with 3N HCl. A dissolution of 100mg of sample into (1+1) HCl was analysed for As using Zeeman GFAA spectrometry. A fusion of 100mg of sample with a mixture of LiBO2+liB4O2 was analysed for Si and Na using ICP technique. Before analysis, the samples were dried at 110°C overnight and fused at 1000°C for 45 minutes.
    Keywords: 10.012; 10.013; 10.014; 11.015; 13.017; 14.018; 5.006; 7TOW_5; 7TOW_6; 7TOW05WT; 7TOW05WT-089D; 7TOW05WT-101D; 7TOW06WT; 7TOW06WT-118D; 7TOW06WT-119D; 7TOW06WT-122D; 7TOW06WT-123D; 7TOW06WT-129D; 7TOW06WT-130D; 7TOW06WT-134D; 7TOW06WT-137D; 7TOW06WT-142D; 7TOW06WT-143D; 7TOW06WT-144D; 7TOW-089D; 7TOW-101D; 7TOW-118D; 7TOW-119D; 7TOW-122D; 7TOW-123D; 7TOW-129D; 7TOW-130D; 7TOW-134D; 7TOW-137D; 7TOW-142D; 7TOW-143D; 7TOW-144D; A203204; A205908; A210707; AII-32-3D; AII42-05; AII-59-3D; AII-59-5D; AII-59-7D; AII60-05; AII60-06; AII70-07; Aluminium oxide; AMC11-67; AMC1167-13A; AMC1167-14B; AMC1167-15; AMC1167-16; AMC1167-18B; AMC1167-29; AMC1167-37; AMC1167-46; AMPH-006D; AMPH01AR; AMPH01AR-006D; AMPHITRITE; ANTIPODE; ANTP06MV-082D; ANTP06MV-086D; ANTP07MV-109D; ANTP07MV-113D; ANTP07MV-115D; ANTP-082D; ANTP-086D; ANTP08MV-127D; ANTP-109D; ANTP-113D; ANTP-115D; ANTP-127D; Argo; ARIES; ARIES-007D; ARIES-009D; ARIES-010D; ARIES-012D; ARIES-013D; ARIES-015D; ARIES-019D; ARIES-020D; ARIES-021D; ARIES-023D; ARIES-024D; ARIES-025D; ARIES-027D; ARIES-029D; ARIES-030D; ARIES-031D; ARIES-032D; ARIES-034D; ARIES-036D; ARIES-037D; ARIES-039D; ARIES-051D; ARIES-052D; ARIES-055D; ARIES-056D; ARIES-058D; Arsenic; AT-II-10707-13; AT-II-10707-14; AT-II-10707-16; ATII42-05; AT-II-42-1; ATII60-06; ATII-60-10D; ATII-60-12D; AT-II-60-19; AT-II-60-2; ATII-60-4D; Atlantic Ocean; Atlantis II (1963); BA73; Barium; Bartlett; Blake Plateau, Atlantic Ocean; BRTL73-D1B; Cadmium; Calcium oxide; Carbon dioxide; CARR2_6D; CARR2_9D; CARR2-1D; CARROUSEL2; CCTW-01D; CCTW-02D; CERE; CERE03WT-001D; CERE03WT-005D; CERE03WT-006D; CERE03WT-009D; CERE03WT-010D; CERE03WT-012D; CERE03WT-013D; CERE03WT-014D; CERE03WT-015D; CERE03WT-018D; CERE03WT-019D; CERE03WT-020D; CERE03WT-021D; Cerium; CH05801; CH07501; CH58-9RD; CH-75-1RD; Chain; Chromium; Cobalt(II,III) oxide; COCOTOW; Copper(II) oxide; Cruise_41; D3; Deposit type; DEPTH, sediment/rock; Discoverer (1966); DISTANCE; Distance, maximum; Distance, minimum; DODO; DODO-008D; DODO-009D-2; DODO-011D; DODO-013D; DODO-014D; DODO-015D-1; DODO-113D; DODO-125D; DODO-232D; Dredge; Dredge, box; Dredge, chain bag; Dredge, pipe; Dredge, rock; DRG; DRG_B; DRG_C; DRG_P; DRG_R; DSTGR74-D6; DSTGR74-D7; E05.25 RD5.15; E27.02A BT27.2; East Pacific Ocean; Elevation of event; ELT05; ELT05.004SS-RD; ELT05.015B-RD; ELT05.016-RD; ELT05.017-RD; ELT06; ELT06.002-BT; ELT06.005-RD; ELT06.006-RD; ELT06.007-BT; ELT06.007-RD; ELT06.010-RD; ELT06.013-RD; ELT06.014-BT; ELT06.015-BT; ELT07; ELT07.002-MT; ELT07.007-BT; ELT07.017-RD; ELT09; ELT09.014-MT; ELT09.018-BT; ELT10; ELT10.010-MT; ELT10.010-RD; ELT10.011-BT; ELT10.012-MT; ELT10.013-BT; ELT10.019-MT; ELT10.020-MT; ELT11; ELT11.018-BT; ELT12; ELT12.012-BT; ELT12.016-BT; ELT12.017-BT; ELT12-16C; ELT13; ELT13.007-BT; ELT13.008-BT; ELT13.013-BT2; ELT15; ELT15.001-BT; ELT15.004-BT; ELT15.005-BT; ELT15.007-MT; ELT15.008-BT; ELT17; ELT17.009-RD; ELT17.029-BT; ELT18; ELT18.003-BT; ELT19; ELT19.003BT; ELT20; ELT20.003-BT; ELT20.008-RS; ELT21; ELT21.007-RS; ELT21.008-RS; ELT21.011-RS; ELT21.012-RS; ELT21.016-BT; ELT21.020-BT; ELT23; ELT23.002-RS; ELT23.003-BT; ELT23.005-RS; ELT24; ELT24.002-BT; ELT24.008-RS; ELT24.015-RS; ELT25; ELT25.001-RS; ELT25.005-BT; ELT25.006-RS; ELT27; ELT27.027BT; ELT38; ELT38.017-KG; Eltanin; ERDC; ERDC-001D; ERDC-007D; ERDC-019D; Event label; Flame atomic absorption spectrometry (FAAS); GECS0IMV-001D; Geochemistry; GEOSECS_Pacific_8; Gillis cruise GS7103; Gillis cruise GS7202; Gillis cruise GS7308; Grab; GRAB; GS7103-010-06; GS7202-057-06; GS7202-058-06; GS7202-059-06; GS7202-060-06; GS7202-069-06; GS7202-102; GS7308-010-06; GUAY-2D; GUAY-5D; GUAYAMAS; Horizon; HYPO01MV-053D; HYPO01MV-060D; HYPOGENE; Identification; Indian Ocean; Induction coupled plasma emission spectrometry; Iron oxide, Fe2O3; KA68E; KA9-11; Kana Keoki; Kane; KK72; KK72MW-RD32; KK72MW-RD47; KK740109-03; KK740109-04; KK740109-05; KK740109-05-RD12; KK740109-3-RD4; KK740109-4-RD9; KK760806; KK760806-01,KK760806-02,KK76; KK760806-01-RD12; KK760806-02; KK760806-02-RD9; KK760806-2-RD13; KK761108; KK761108-RD10; KK761108-RD11B; KK761108-RD9; KK77; KK770317; KK770317-4 M01; KK770317-4 M09; KK770317-4 M10; KK770317-4 M11; KK770317-4-RD01; KK770317-4-RD09; KK770317-4-RD10; KK770317-4-RD11; KK781230; KK78-12-RD14; KK78-12-RD2; KK78-12-RD25; KK78-12-RD27; KK78-12-RD29; KK78-12-RD4; KK790808; KK790808-1-RD50; KK790808-2-RD52; KK790808-RD33; KK790808-RD41; KK790808-RD42; KK790808-RD44; KK790808-RD51; KK790808-RD54; KK791029; KK791029-RD58; KK791029-RD60; KK791029-RD61; KK791029-RD62; KK791029-RD63; KK80; KK8004/RD1; KK800414; KK8007/RD25 (STA56); KK8007/RD27 (STA58); KK8007/RD28 (STA59); KK8007/RD29 (STA60); KK8007/RD30 (STA61); KK8007/RD31 (STA62); KK8007/RD32 (STA63); KK8007/RD33 (STA64); KK8007/RD34 (STA65); KK8007/RD35 (STA66); KK8007/RD37 (STA68); KK8007/RD38 (STA69); KK8007/RD39 (STA70); KK800715; KK80-414; KK80-RD1; KK80-RD16; KK80-RD2; KK80-RD20; KK80-RD22; KK80-RD23; KK80-RD25; KK80-RD26; KK80-RD27; KK80-RD28; KK80-RD29; KK80-RD3; KK80-RD30; KK80-RD31; KK80-RD32; KK80-RD33; KK80-RD34; KK80-RD35; KK80-RD37; KK80-RD38; KK80-RD39; KK80-RD4; KK80-RD5; KK80-RD7; KK80-RD8; KK80-RD9; KK810620; KK810620-RD35; KK810620-RD41; KK810620-RD43; KK810620-RD48; KK810626-02; KK810626-05; KK810626-2-RD09; KK810626-2-RD10; KK810626-5-RD68; KK810626-5-RD75; KK840428-05; KK840428-PD10; KK840428-PD11; KK840428-PD12; KK840428-PD18; KK840428-PD6; KK840428-PD7; KK840428-RD22; KK840428-RD23; KK840428-RD24; KK840428-RD25; KK840428-RD27; KK840428-RD28; KK840428-RD29; KK840428-RD30; KK840428-RD32; KK840428-RD34; KK840428-RD35; KK840428-RD39; KK840428-RD40; KK840824-02; KK840824-05; KK840824-RC4; KK840824-RC8; KK840824-RD47; KK840824-RD50; KK840824-RD51; KK840824-RD53; KK840824-RD54; KK840824-RD57; KK840824-RD60; KK840824-RD64; KK840824-RD66; KK840824-RD75; KKMN7601; KN04205; Knorr; KNR-42-33RD; KNR-42-39RD; KNR-42-42RD; KNR-42-45RD; L583HU/009/D6; L583HU/010/D7AX.L583HU/010/D7FX; L583HW; L583HW/001/D1A; L583HW/005/PC2A; L583HW/006/PC3A; L583HW/008/D5BX.L583HW/008/D5CX; L583HW/012/D8A; L583HW/014/D10; L583HW/018/D11A; L583HW/019/D12A; L583HW/021/D14A; L583HW/022/D15B; L583HW/024/D17A; L583HW/026/D18; L583HW/040/D23; L583HW/041/D24; L583HW/042/D25; L583HW/045/D27; L583HW/046/D28; L583HW/049/D31; L583HW/050/D32; L583HW-D1; L583HW-D10; L583HW-D11; L583HW-D12; L583HW-D14; L583HW-D15; L583HW-D17; L583HW-D18; L583HW-D23; L583HW-D24; L583HW-D25; L583HW-D27; L583HW-D28; L583HW-D31; L583HW-D32; L583HW-D5; L583HW-D6; L583HW-D7; L583HW-D8; L583HW-PC002; L583HW-PC003; L9-84-CP; L984CP-D1; L984CP-D12; L984CP-D13; L984CP-D14; L984CP-D15; L984CP-D17; L984CP-D18; L984CP-D4; L984CP-D6; Laboratory code/label; Latitude of event; Lead; Leg 8; Longitude of event; LSDA; LSDA-199D; LUSIAD-A; Magnesium oxide; Majuro Atoll (S0.001); Manganese dioxide; manganese micronodule; manganese nodule; Melville; MIDPAC I; MIDPAC IIa; MN76-01, Pleiades; Moana Wave; Molybdenum; MONS01AR-MONS08AR; MONSOON; MSN-20D; MW8513; MW8513-RD01; MW8513-RD02; MW8513-RD06; MW8513-RD09; New Horizon; Nickel oxide; NMNH-110675, IFU-8; NMNH 117615-3; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; North-East Pacific Ocean; North Pacific Ocean; NOVA04HO-062D; NOVA04HO-064D; NOVA-H; NOVA-H62D; NOVA-H64D; OC68; ocean; Oceanographer; OCNGR68; OCNGR68-D14; OCNGR68-D15; OCNGR68-D9; P6707; P6707-30D; P6707a; P6707a-007-006; P7003; P7003-36D; Pacific Ocean; Pacific Oean; PC; Phosphorus pentoxide; Pillsbury; Piston corer; PLDS04MV-008D; PLDS-4; Potassium oxide; QBR-22D; QBR-7A; QBR-8B; QUEBRADA; RC05; RC05-1RD; RC13; RC13-1RD; RC13-5RD; RC14; RC14-1RD; RC14-2RD; RC14-3RD; RC14-4RD; RC15; RC15-13RD; RC15-14RD; RC15-16RD; RC15-19RD; RC15-20RD; RC15-21RD; RC15-23RD; RC15-25RD; RC15-28RD; RC15-2RD; RC15-4RD; RC15-5RD; RC15-7RD; RC15-8RD; RC16; RC16.13.D19; RC16-002RD; RC16-008RD; RC16-011RD; RC16-012RD; RC16-019RD; RC16-10RD; RISE3-13D; RISE3-19D; RISE3-20D; RISE3-23D; RISE3-24D; RISE3-25D; RISE3-26D; RISE3-27D; RISE3-28D;
    Type: Dataset
    Format: text/tab-separated-values, 22984 data points
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 25 (1953), S. 1122-1123 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 85 (1981), S. 3700-3707 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 30 (1926), S. 694-705 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 29 (1925), S. 1312-1316 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 7465-7469 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An endoreversible Carnot-type heat engine is studied under the usual restrictions: no friction, working substance in internal equilibrium (endoreversibility), no mechanical inertial effects, and under Newton's cooling law for heat transfer between working fluid and heat reservoirs. A monoparametric family of straight lines which is isoefficient is found; i.e., all points (engine configurations) that belong to same line have the same efficiency. Along each line the power output divided by entropy production is a constant. From these properties and by using some dissipated quantities, relationships are obtained between reversible work and finite-time work and between reversible efficiency and finite-time efficiency. An "ecological'' criterion is proposed for the best mode of operation of this heat engine. It consists in maximizing a function representing the best compromise between power and the product of entropy production and the cold reservoir temperature. The corresponding efficiency results almost equal to the average of the Carnot and the Curzon and Ahlborn [Am. J. Phys. 43, 22 (1975)] efficiencies.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 2216-2219 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We calculate the efficiency of an endoreversible Carnot-type cycle in the maximum power regime by using a nonlinear heat transfer law (the so-called Dulong and Petit's law of cooling). The results obtained from this model compare well (around 99% in some cases) with observed efficiencies for several power plants. The considered law of cooling includes conductive- convective and radiative contributions to the heat exchange between the working fluid and its surroundings. Our calculations improve considerably those obtained by means of a linear heat transfer law for the same power sources. We also analyze a nuclear power plant using an ecological optimization criterion for finite-time heat engines.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 3355-3355 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Sagittal focusing of a synchrotron radiation beam by cylindrically bending the second crystal in a double-crystal monochromator is an important way of increasing beam density at the sample posiion. In this paper we describe results obtained by finite element analysis of various optimized Si (111) crystal shapes. For the bending magnet and wiggler sources, we analyzed ribbed crystals and found conditions at which the sagittal curvature is cylindrical and the anticlastic effect is minimized. For the undulator A source, we found that a single slot in the center of a thick plate would be sufficient to eliminate the anticlastic effect and ensure cylindrical sagittal bending. Autofocusing of the beam by means of a trapezoidal slot was investigated, and simulation results are discussed. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 3379-3380 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: In this report we consider the use of the program SHADOW for ray tracing different configurations of the PNC-CAT mircrofocus beamline. The emphasis is on the final design, which will include crystal and grazing incidence optics focusing onto the entrance of a long tapered glass capillary whose outlet diameter is of the order of one micron or less. The ray-tracing program has been especially valuable in comparing different configurations, determining the required stability of components, and optimizing the capillary profile. It has also been useful in evaluating the results of actual measurements on the throughput of long tapered capillaries fabricated of silica glass. Suggestions for improvements to SHADOW are given. We also present results of a compact pc-based capillary ray-tracing program for comparison. It allows us to use different profiles with minimal programming effort. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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