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Die tribologischen Eigenschaften von vergoldeten elektrischen Kontakten

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ISBN: 9783731501466 Year: Pages: XIV, 138 p. DOI: 10.5445/KSP/1000037554 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:02:02
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Electrical contacts in automotive applications are exposed to thermal and vibration induced relative motion in the tribological contact. Fretting tests with an AuCo/Ni vs. Au/NiP ball to plate contact were conducted in order to describe the ongoing wear mechanisms. Furthermore, a global wear approach was chosen to quantify the overall wear. According to a predefined electrical failure criterion the connector lifetime is demonstrated in a model depending on oscillating amplitude, gold thickness and contact roughness. The electrical failure of the contact can be reduced to the wear of the gold platings leading to exposure of the nickel interlayer and consequently oxidation. Through material transfer, plowing, particle generation and the particle transport mechanisms the contact resistance increases and therefore limits the connector lifetime. The link between the lifetime models and the global wear approach allows for calculation of the lifetime when only the wear and the stress of the tribosystem are known.

Black Gold: Aboriginal People on the Goldfields of Victoria, 1850-1870

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ISBN: 9781921862953 Year: DOI: 10.26530/OAPEN_459855 Language: English
Publisher: ANU Press
Subject: Sociology --- History
Added to DOAB on : 2014-01-13 12:33:49
License: ANU Press

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Fred Cahir tells the story about the magnitude of Aboriginal involvement on the Victorian goldfields in the middle of the nineteenth century. The first history of Aboriginal–white interaction on the Victorian goldfields, Black Gold offers new insights on one of the great epochs in Australian and world history—the gold story. In vivid detail it describes how Aboriginal people often figured significantly in the search for gold and documents the devastating social impact of gold mining on Victorian Aboriginal communities. It reveals the complexity of their involvement from passive presence, to active discovery, to shunning the goldfields. This detailed examination of Aboriginal people on the goldfields of Victoria provides striking evidence which demonstrates that Aboriginal people participated in gold mining and interacted with non-Aboriginal people in a range of hitherto neglected ways. Running through this book are themes of Aboriginal empowerment, identity, integration, resistance, social disruption and communication.

Untersuchungen zur Herstellung geträgerter mono- und bimetallischer Nanopartikel mithilfe von überkritischem CO2

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ISBN: 9783731504665 Year: Pages: X, 201 p. DOI: 10.5445/KSP/1000051502 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Chemical Engineering
Added to DOAB on : 2019-07-30 20:01:59
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Mono- and bimetallic nanoparticles were deposited onto different powdered supports by Supercritical Fluid Reactive Deposition (SFRD). Carbon dioxide was used as supercritical solvent and hydrogen as reduction agent. In order to optimize the production process unknown factors influencing the particle and product properties were extensively studied.

Consolidated Gold Fields in Australia

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ISBN: 9781760463496 Year: Pages: 504 DOI: 10.22459/CGFA.2020 Language: English
Publisher: ANU Press
Subject: Medicine (General) --- History --- Migration
Added to DOAB on : 2020-05-08 10:44:09
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"Consolidated Gold Fields was a major British mining house founded by Cecil Rhodes in 1892. Diversifying from its South African gold interests, the company invested widely during the following century. This included investments in the Western Australian gold sector from the 1920s and exploration and mining activities elsewhere in Australia and the Territory of New Guinea. In the 1960s, Consolidated Gold Fields Australia (CGFA) was formed. CGFA had ambitious plans and the financial backing from London to establish itself as one of the main diversified mining companies in Australia. Investments were held in the historic Mount Lyell Mining and Railway Company, in Renison, and it was one of the first groups to develop iron ore deposits in the Pilbara of Western Australia. It also acquired a major interest in mineral sands. While the London-based Consolidated Gold Fields ceased to exist in 1989, taken over and dismembered by renowned corporate raider Hanson Plc, its Australian subsidiary, renamed Renison Goldfields Consolidated (RGC), continued for another nine years as a diversified mining group before it suffered its own corporate demise, facilitated by Hanson. CGFA and RGC were important participants in Australia’s post–World War II mining sector. This book is a history of a once great British mining-finance house and its investments in Australia. Consolidated Gold Fields had a rich and broad history in Australia; its ultimate fate did not demonstrate its potential as an Australian mining company."

Black, White and Gold. Goldmining in Papua New Guinea 1878–1930

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ISBN: 9781921934339 Year: DOI: 10.26530/OAPEN_616883 Language: English
Publisher: ANU Press
Subject: History --- Migration --- Medicine (General)
Added to DOAB on : 2016-09-22 11:01:16
License: ANU Press

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Australian goldminers were among the first white men to have sustained contact with Papua New Guineans. Some Papua New Guineans welcomed them, worked for them, traded with them and learnt their skills and soon were mining on their own account. Others met them with hostility, either by direct confrontation or by stealthy ambush. Many of the indigenous people and some miners were killed. The miners were dependent on the local people for labourers, guides, producers of food and women. Some women lived willingly in the miners’ camps, a few were legally married, and some were raped. Working conditions for Papua New Guineans on the claims were mixed; some being well treated by the miners, others being poorly housed and fed, ill-treated, and subject to devastating epidemics. Conditions were rough, not only for them but for the diggers too. This book, republished in its original format, shows the differences in the experience of various Papua New Guinean communities which encountered the miners and tries to explain these differences. It is a graphic description of what happens when people from vastly different cultures meet. The author has drawn on documentary sources and interviews with the local people to produce, for the first time, a lively history.

Mineralogy of Noble Metals and “Invisible” Speciations of These Elements in Natural Systems

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ISBN: 9783039286348 / 9783039286355 Year: Pages: 224 DOI: 10.3390/books978-3-03928-635-5 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General) --- Geology --- Earth Sciences
Added to DOAB on : 2020-06-09 16:38:57
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This Special Issue covers a broad range of topics related to the mineralogy of noble metals (Au, Ag, Pt, Pd, Rh, and Ru) and the occurrence, formation, and distribution of these elements in natural ore-forming systems. This collection of eleven research articles discusses various problems related to these topics. I hope this Special Issue will contribute to a better understanding of the genesis of gold, silver, and other noble metal deposits as well as the behavior of these elements in endogenic and supergene environments, and suggest ways forward to solving the problem of their full extraction from ores.

Keywords

gold selenide --- gold sulfoselenide --- colloids --- nanoparticles --- nucleation --- liquid intermediates --- deposition --- XPS --- sulfide minerals --- platinum --- deposition --- valleriite --- chloride complexes --- zircon U–Pb age --- in situ sulfur isotopes --- gold source --- ore genesis --- Chaoyangzhai gold deposit --- Southeast Guizhou --- mineralization age --- Nibao gold deposit --- ore-forming fluid --- Rb–Sr isotopic composition --- Yunnan–Guizhou–Guangxi “Golden Triangle” region --- Gaching ore deposit --- mustard gold --- calaverite --- maletoyvayamite --- Fe-Sb(Te,As,Se,S)-oxides --- Au-Sb(Te,Se,S,As)-oxides --- Cu-Fe-Ni-S system --- platinum-group elements --- Au --- Ag --- metalloid elements --- fractional crystallization --- drop-shaped inclusions --- noble metals --- invisible species --- distribution --- pyrite --- arsenopyrite --- structural and surficial modes --- arsenopyrite --- crystal lattice --- ligand surroundings --- non-equal positions --- Mössbauer Effect --- gold --- “invisible” gold --- gold ore deposits --- Kagan ultramafic massif --- Southern Urals --- antigorite serpentinites --- magnetite veins --- gold mineralization --- native gold --- thermodynamic modeling --- fluid regime --- Fennoscandian Shield --- Kolmozero–Voronya belt --- Oleninskoe deposit --- mustard gold --- dyscrasite --- chlorargyrite --- gold ore field --- karst cavities --- monolithic and porous gold --- Tl oxides (avicennite) --- Tl carbonates --- Tl tellurates and antimonates --- n/a

Die Goldbüste des Septimius Severus: Gold- und Silberbüsten römischer Kaiser

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ISBN: 9783952454268 Year: Volume: 1 Pages: 208 DOI: 10.19218/3952454268 Language: German
Publisher: LIBRUM Publishers & Editors LLC
Subject: Archaeology --- History --- Mining and Metallurgy
Added to DOAB on : 2017-09-15 08:59:01
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Die Goldbüste des Kaisers Septimius Severus (193–211 n. Chr.) wurde im Jahr 1965 in Didymoteicho, dem antiken Plotinopolis (Nordgriechenland) gefunden. Dieser überaus seltene Fund hochstehender Goldschmiedearbeit liegt erstmals ausführlich untersucht und bebildert vor. Es handelt sich um die eine von nur zwei erhaltenen größeren Goldbüsten römischer Kaiser; das zweite, leicht unterlebensgroße Exemplar ist die Büste von Marc Aurel aus Avenches (Schweiz). Die 28 cm hohe Goldbüste des Septimius Severus wiegt knapp drei römische Pfund (980 g) und entspricht somit einem vielfach für solche Objekte verwendeten Gewichtsmodul. Goldporträts waren dem Kaiser vorbehalten. Als portable Bildnisse konnten sie den Kaiser bei offiziellen Handlungen wie am Gericht vertreten, sie dienten aber auch im Kaiserkult sowie in der römischen Armee, wo sie an der Spitze von Standarten mitgetragen wurden.Mit Beiträgen von Alessandra Giumlia-MairFotos der Goldbüste des Septimius Severus von Thanos Kartsoglou

Geomicrobiology and Biogeochemistry of Precious Metals

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ISBN: 9783038973461 9783038973478 Year: Pages: 182 DOI: 10.3390/books978-3-03897-347-8 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Biotechnology --- Ecology --- Geology --- Earth Sciences --- Environmental Sciences
Added to DOAB on : 2018-11-20 10:57:53
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Precious metals continue to have economic and sociocultural importance, as their usage evolves and diversifies over time. Today, the industrial application of precious metals is increasing with the development of scientific and technological innovations. Especially, the biological cycling of these metals is receiving more and more attention, as the microbiota may be key to a range of issues regarding exploration, ore-processing and metallurgy, and the processing of electron waste. In this volume, we focus on enhancing the fundamental understanding of the biological processes that drive noble metal cycling and examine how this knowledge may be turned into biotechnolical applications.

Don't Weep a Gold Chain

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Book Series: Slavistische Beitraege ISBN: 9783876908724 Year: Pages: 309 DOI: 10.3726/b12705 Language: English
Publisher: Peter Lang International Academic Publishing Group
Subject: Linguistics
Added to DOAB on : 2019-01-15 13:31:33
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In this work I have endeavoured to apply the theory of primary and secondary systems as defined by D.S. Likhachev to Russian literary texts. Likhachev's idea amounts to the fact that those systems reoccur alternately. Thus, a primary system evolves into a so-called elliptic stage which enables a succeeding, secondary system to develop itself. Conversely, when the latter has become the standard norm it gradually evolves, in turn, into a similar elliptic stage. This, in turn, gradually develops into a primary system too. As far as the fluent succession of systems is concerned, Likhachev's theory differs from a similar theory developed by E.R. Curtius. The latter assumes that literary works should be divided into works with a Classicistic and a Manneristic character. The first develop into the latter which show a frozen character with no original qualities. In the end works with a new Classicistic character develop themselves. These, in turn, have a vital character again. In other words, in Curtius' scheme there is no place for a fluent alternation of systems the way there is in Likhachev's.

Polymetallic Metallogenic System

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ISBN: 9783039212934 9783039212941 Year: Pages: 538 DOI: 10.3390/books978-3-03921-294-1 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Science (General)
Added to DOAB on : 2019-12-09 16:10:12
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Within the last decade, the high and continuing demand for precious and base metals, as well as critical elements, has prompted a global rush on a scale never before seen. This eventually resulted in the demand for considerable innovation and improvement in mineral deposit genetic modelling and ore formation regimes for the many different types of gold deposits, now recognized, and paralleled by the wide employment of exploration techniques and a rapid expansion of geological databases. This Special Issue will show case studies of porphyry polymetal systems, orogenic gold formations, water–rock reaction, ore-forming structure evolution, mineralogy and petrology of ore deposit, ore formation regime, geochronology and geochemistry of ore deposit, ore-forming evolution, mineral exploration and cutting-edge technology in ore deposit study.

Keywords

W–Sn skarn --- whole-rock geochemistry --- Huangshaping --- Shizhuyuan --- Xianghualing --- Rare-Earth Elements --- C–O isotopes --- hydrothermal calcite --- ore-forming processes --- Phapon gold deposit --- oxidation state --- hydrous melts --- constraints on mineralization --- Beiya Au deposit --- SW China --- zircon geochronology --- magmatic oxygen fugacity --- petrogenesis --- Zaozigou deposit --- West Qinling --- archean basement --- quartz vein --- hydrothermal alteration halo --- Pinglidian gold deposit --- Jiaodong --- geochemistry --- U–Pb zircon age --- Sr–Nd isotopes --- Haoyaoerhudong gabbro --- Inner Mongolia --- geochronology --- Hf isotopes --- petrogenesis --- paleo-Tethyan ocean closure --- Zaorendao gold deposit --- West Qinling --- syenite --- post-collisional --- niobium mineralization --- Saima deposit --- Liaoning Province --- invisible gold --- visible gold --- LA-ICP-MS --- Yangshan gold belt --- West Qinling --- zircon U-Pb dating --- molybdenite Re-Os dating --- zircon Hf isotopes --- Weilasituo Sn-polymetallic deposit --- Inner Mongolia --- orogenic-gold deposit --- mineral geo-thermometry --- physicochemical condition of mineralization --- Zhengchong gold deposit --- Jiangnan orogenic belt --- lithospheric architecture --- metallogenesis --- Hf-Nd isotopic mapping --- Liaodong Peninsula --- North China Craton --- zircon U–Pb geochronology --- Sr–Nd–Pb–Hf isotopes --- low Sr and high Yb A2-type granite --- Xianghualing --- South China --- fluid inclusion --- stable isotopes --- gold deposition --- Sanshandao gold deposit --- Jiaodong --- fluid inclusions --- H–O isotope --- immiscibility --- water–rock interaction --- Sizhuang gold deposit --- Jiaodong Peninsula --- China --- Pulang porphyry Cu (–Mo–Au) deposit --- LA-ICP-MS zircon U–Pb dating --- molybdenite Re–Os dating --- high-silica adakitic rocks (HSA) --- Northwestern Yunnan Province --- C–H–O isotopes --- fluid inclusion --- Koka deposit --- orogenic gold deposit --- ore shoots --- structural control --- geostatistics --- Sizhuang gold deposit --- Jiaodong Peninsula --- skarn mineralogy --- high fugacity --- garnet Sm–Nd dating --- Late Cretaceous --- Hongshan skarn deposit --- mantle branch --- metallogenesis --- ore-controlling structures --- metallogenic rule --- ore prospecting target --- Jiaodong area --- zircon U–Pb dating --- Re–Os dating --- middle–late Jurassic --- Mo-polymetallic deposit --- Great Xing’an Range --- Dongbulage --- A-type granite --- tin mineralization --- Tiantangshan tin polymetallic deposit --- SE China --- Chishan alkaline complex --- rock geochemistry --- zircon U–Pb dating --- Lu–Hf isotopes --- Hegenshan-Heihe suture zone --- Cu-Au hydrothermal mineralization --- Hongyan deposit --- Permian A-type granite --- granite petrogenesis --- magmatic oxygen fugacity --- post-collisional slab break-off --- quartz --- trace element --- precipitation mechanism --- in situ study --- sericite --- acidity --- formation temperature --- n/a

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