Les Inscriptions à la Bibliothèque sont ouvertes en
ligne via le site: https://biblio.enp.edu.dz
Les Réinscriptions se font à :
• La Bibliothèque Annexe pour les étudiants en
2ème Année CPST
• La Bibliothèque Centrale pour les étudiants en Spécialités
A partir de cette page vous pouvez :
Retourner au premier écran avec les recherches... |
Détail de l'indexation
Ouvrages de la bibliothèque en indexation 553
Affiner la rechercheBiogeochemistry of uranium deposits and methodological fundamentals of their prospecting / Gregory Levita in Economic geology, Vol. 107 N° 3 (Mai 2012)
[article]
in Economic geology > Vol. 107 N° 3 (Mai 2012) . - p. 553
Titre : Biogeochemistry of uranium deposits and methodological fundamentals of their prospecting Type de document : texte imprimé Auteurs : Gregory Levita, Auteur Année de publication : 2012 Article en page(s) : p. 553 Note générale : Economic geology Langues : Anglais (eng) Mots-clés : Uranium deposits Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Note de contenu : Book reviews DEWEY : 553 ISSN : 0361-0128 En ligne : http://econgeol.geoscienceworld.org/content/107/3/553.1.short [article] Biogeochemistry of uranium deposits and methodological fundamentals of their prospecting [texte imprimé] / Gregory Levita, Auteur . - 2012 . - p. 553.
Economic geology
Langues : Anglais (eng)
in Economic geology > Vol. 107 N° 3 (Mai 2012) . - p. 553
Mots-clés : Uranium deposits Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Note de contenu : Book reviews DEWEY : 553 ISSN : 0361-0128 En ligne : http://econgeol.geoscienceworld.org/content/107/3/553.1.short Broad synchroneity of three gold mineralization styles in the kalgoorlie gold field / Noreen M. Vielreicher in Economic geology, Vol. 105 N° 1 (Janvier/Fevrier 2010)
[article]
in Economic geology > Vol. 105 N° 1 (Janvier/Fevrier 2010) . - pp. 187-227
Titre : Broad synchroneity of three gold mineralization styles in the kalgoorlie gold field : SHRIMP, U-Pb, and 40Ar/39Ar geochronological evidence Type de document : texte imprimé Auteurs : Noreen M. Vielreicher, Auteur ; David I. Groves, Auteur ; Lawrence W. Snee, Auteur Année de publication : 2011 Article en page(s) : pp. 187-227 Note générale : Economic geology Langues : Anglais (eng) Mots-clés : Gold mineralization Uranium Plomb Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Résumé : There has been a long-standing controversy regarding the timing and number of gold mineralization events at Kalgoorlie. Uranium-Pb dating of zircons and hydrothermal monazite and xenotime, as well as 40Ar/39Ar analysis of metasomatic fuchsite and white mica, are used to date pre- to synore dikes, alteration, and orebodies in order to resolve this issue. The majority of gold mineralization at Kalgoorlie, including ductile-brittle Fimiston-, brittle-ductile Oroya- and brittle Mount Charlotte-style gold, are different expressions of a complex mineralizing system that was active at broadly the same time at ca. 2.64 Ga. Gold mineralization was thus deposited in both ductile and brittle structures at approximately the same crustal level at broadly the same time, under similar P-T conditions. This giant ore system formed after ca. 2.69 Ga basic magmatism, intrusion of the Golden Mile Dolerite sill at 2680 ± 9 Ma, and intrusion of calc-alkaline feldspar-quartz porphyry dikes at 2670 ± 5 Ma. Gold mineralization was broadly coeval with lamprophyre dike intrusion at 2642 ± 6 Ma and overlapped the waning stages of hornblende- and albite-bearing porphyry dike emplacement at 2650 ± 6 Ma and regional metamorphism. Subsequent brittle deformation in the Kalgoorlie gold field was accompanied by hydrothermal activity that may have led to some late gold mineralization or remobilization in extensional quartz vein arrays in the Golden Mile between about 2.61 and 2.60 Ga. This late hydrothermal activity and associated brittle deformation marks the last event to significantly affect the rocks at Kalgoorlie and may be related to uplift and final cooling of the terrane. Despite this late event, the geometry of the Kalgoorlie gold field and its contained lode systems has remained essentially the same since the time of gold mineralization. DEWEY : 553 ISSN : 0361-0128 En ligne : http://econgeol.geoscienceworld.org/content/105/1/187.abstract [article] Broad synchroneity of three gold mineralization styles in the kalgoorlie gold field : SHRIMP, U-Pb, and 40Ar/39Ar geochronological evidence [texte imprimé] / Noreen M. Vielreicher, Auteur ; David I. Groves, Auteur ; Lawrence W. Snee, Auteur . - 2011 . - pp. 187-227.
Economic geology
Langues : Anglais (eng)
in Economic geology > Vol. 105 N° 1 (Janvier/Fevrier 2010) . - pp. 187-227
Mots-clés : Gold mineralization Uranium Plomb Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Résumé : There has been a long-standing controversy regarding the timing and number of gold mineralization events at Kalgoorlie. Uranium-Pb dating of zircons and hydrothermal monazite and xenotime, as well as 40Ar/39Ar analysis of metasomatic fuchsite and white mica, are used to date pre- to synore dikes, alteration, and orebodies in order to resolve this issue. The majority of gold mineralization at Kalgoorlie, including ductile-brittle Fimiston-, brittle-ductile Oroya- and brittle Mount Charlotte-style gold, are different expressions of a complex mineralizing system that was active at broadly the same time at ca. 2.64 Ga. Gold mineralization was thus deposited in both ductile and brittle structures at approximately the same crustal level at broadly the same time, under similar P-T conditions. This giant ore system formed after ca. 2.69 Ga basic magmatism, intrusion of the Golden Mile Dolerite sill at 2680 ± 9 Ma, and intrusion of calc-alkaline feldspar-quartz porphyry dikes at 2670 ± 5 Ma. Gold mineralization was broadly coeval with lamprophyre dike intrusion at 2642 ± 6 Ma and overlapped the waning stages of hornblende- and albite-bearing porphyry dike emplacement at 2650 ± 6 Ma and regional metamorphism. Subsequent brittle deformation in the Kalgoorlie gold field was accompanied by hydrothermal activity that may have led to some late gold mineralization or remobilization in extensional quartz vein arrays in the Golden Mile between about 2.61 and 2.60 Ga. This late hydrothermal activity and associated brittle deformation marks the last event to significantly affect the rocks at Kalgoorlie and may be related to uplift and final cooling of the terrane. Despite this late event, the geometry of the Kalgoorlie gold field and its contained lode systems has remained essentially the same since the time of gold mineralization. DEWEY : 553 ISSN : 0361-0128 En ligne : http://econgeol.geoscienceworld.org/content/105/1/187.abstract Calculation of frequency response envelope for dynamic systems with uncertain parameters / Wen-Hua Chen in Transactions of the ASME . Journal of dynamic systems, measurement, and control, Vol. 133 N° 6 (Novembre 2011)
[article]
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 133 N° 6 (Novembre 2011) . - 09 p.
Titre : Calculation of frequency response envelope for dynamic systems with uncertain parameters Type de document : texte imprimé Auteurs : Wen-Hua Chen, Auteur Année de publication : 2012 Article en page(s) : 09 p. Note générale : Dynamic systems Langues : Anglais (eng) Mots-clés : Closed loop systems Finite element analysis Frequency response Nonlinear control systems Open loop systems Transfer functions Uncertain systems Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Résumé : Frequency response finds a wide range of applications in many engineering sectors. When variations and uncertainties exist during the operation and lifetime of an engineering system, the calculation of frequency response for an uncertain dynamic system is required in order to assess the worst cases in terms of various criteria, for example gain and phase margins in control engineering, or peak magnitude at different modes in the finite element analysis of structures. This paper describes an analytical approach toward the identification of critical interior lines that possibly contribute to the boundary of the frequency response. It is allowed that uncertain parameters perturb transfer function coefficients in a nonlinear form. Conditions for critical interior lines contributing to the boundary of the frequency response are presented. An invariant property of these critical lines under open-loop and closed-loop configurations augmented by control systems or compensators is established, which greatly simplifies the analysis, design, and verification process when using frequency domain techniques. A procedure for computing frequency response and identifying the worst cases is then developed based on the combination of symbolic and numerical computation. DEWEY : 553 ISSN : 0022-0434 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA000133000006 [...] [article] Calculation of frequency response envelope for dynamic systems with uncertain parameters [texte imprimé] / Wen-Hua Chen, Auteur . - 2012 . - 09 p.
Dynamic systems
Langues : Anglais (eng)
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 133 N° 6 (Novembre 2011) . - 09 p.
Mots-clés : Closed loop systems Finite element analysis Frequency response Nonlinear control systems Open loop systems Transfer functions Uncertain systems Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Résumé : Frequency response finds a wide range of applications in many engineering sectors. When variations and uncertainties exist during the operation and lifetime of an engineering system, the calculation of frequency response for an uncertain dynamic system is required in order to assess the worst cases in terms of various criteria, for example gain and phase margins in control engineering, or peak magnitude at different modes in the finite element analysis of structures. This paper describes an analytical approach toward the identification of critical interior lines that possibly contribute to the boundary of the frequency response. It is allowed that uncertain parameters perturb transfer function coefficients in a nonlinear form. Conditions for critical interior lines contributing to the boundary of the frequency response are presented. An invariant property of these critical lines under open-loop and closed-loop configurations augmented by control systems or compensators is established, which greatly simplifies the analysis, design, and verification process when using frequency domain techniques. A procedure for computing frequency response and identifying the worst cases is then developed based on the combination of symbolic and numerical computation. DEWEY : 553 ISSN : 0022-0434 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA000133000006 [...] A carbonaceous sedimentary source-rock model for carlin-type and orogenic gold deposits / Ross R. Large in Economic geology, Vol. 106 N° 3 (Mai 2011)
[article]
in Economic geology > Vol. 106 N° 3 (Mai 2011) . - pp. 331-358
Titre : A carbonaceous sedimentary source-rock model for carlin-type and orogenic gold deposits Type de document : texte imprimé Auteurs : Ross R. Large, Auteur ; Stuart W. Bull, Auteur ; Valeriy V. Maslennikov, Auteur Année de publication : 2011 Article en page(s) : pp. 331-358 Note générale : Géologie Economique Langues : Anglais (eng) Mots-clés : Carbonaceous sedimentary Genetic model Gold deposits Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Résumé : This paper presents evidence and arguments that carbonaceous sedimentary rocks were a source for Au and As in sediment-hosted orogenic and Carlin-type gold deposits and develops a corresponding genetic model. In this two-stage basin-scale model, gold and arsenic are introduced early into black shale and turbidite basins during sedimentation and diagenesis (stage 1) and concentrated to ore grades by later hydrothermal, structural, or magmatic processes (stage 2). In reduced continental margin basin settings, organic matter, sedimented under anoxic to euxinic conditions, immobilizes and concentrates gold, arsenic, and a range of trace elements (particularly V, Ni, Se, Ag, Zn, Mo, Cu, U) present in marine bottom waters, into fine-grained black mudstone and siltstone of slope and basin facies. During early diagenesis, gold and certain other trace elements (Ni, Se, Te, Ag, Mo, Cu, ±PGE) are preferentially partitioned into arsenian pyrite that grows in the muds. These processes produce regionally extensive black shale and turbidite sequences enriched in syngenetic gold and arsenic, commonly from 5 to 100 ppb Au and 10 to 200 ppm As. Rare organic- and sulfide-rich metalliferous black shales may contain up to 1 to 2 ppm Au and over 1,000 ppm As, present as refractory gold in arsenian pyrite and nanoparticles of free gold.
During late diagenesis and early metamorphism (stage 2) the diagenetic arsenian pyrite is recrystallized to form coarser grained pyrite generations, and the organic matter is cooked to bitumen. Under higher grade metamorphism (lower greenschist facies and above) arsenian pyrite in carbonaceous shales is converted to pyrrhotite. These processes release gold, arsenic, sulfur and other elements (Sb, Te, Cu, Zn, Mo, Bi, Tl, and Pb) from the source rocks to become concentrated by hydrothermal processes, locally to produce gold ores, in structural sites such as fold hinge zones, shear or breccia zones within or above the black shale sequence.
LA-ICP-MS analyses of diagenetic pyrite in carbonaceous sediments, both associated and not associated with gold deposits, suggests that invisible gold contents of greater than 250 ppb in diagenetic pyrite, are indicative of carbonaceous shale source rocks with the potential to produce economic gold deposits. Application of this sedimentary source-rock model enables a systematic exploration approach for sediment-hosted gold deposits, based on the distribution, composition and structure of carbonaceous shale sequences and their contained diagenetic pyrite.
DEWEY : 553 ISSN : 0361-0128 En ligne : http://econgeol.geoscienceworld.org/cgi/content/abstract/106/3/331 [article] A carbonaceous sedimentary source-rock model for carlin-type and orogenic gold deposits [texte imprimé] / Ross R. Large, Auteur ; Stuart W. Bull, Auteur ; Valeriy V. Maslennikov, Auteur . - 2011 . - pp. 331-358.
Géologie Economique
Langues : Anglais (eng)
in Economic geology > Vol. 106 N° 3 (Mai 2011) . - pp. 331-358
Mots-clés : Carbonaceous sedimentary Genetic model Gold deposits Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Résumé : This paper presents evidence and arguments that carbonaceous sedimentary rocks were a source for Au and As in sediment-hosted orogenic and Carlin-type gold deposits and develops a corresponding genetic model. In this two-stage basin-scale model, gold and arsenic are introduced early into black shale and turbidite basins during sedimentation and diagenesis (stage 1) and concentrated to ore grades by later hydrothermal, structural, or magmatic processes (stage 2). In reduced continental margin basin settings, organic matter, sedimented under anoxic to euxinic conditions, immobilizes and concentrates gold, arsenic, and a range of trace elements (particularly V, Ni, Se, Ag, Zn, Mo, Cu, U) present in marine bottom waters, into fine-grained black mudstone and siltstone of slope and basin facies. During early diagenesis, gold and certain other trace elements (Ni, Se, Te, Ag, Mo, Cu, ±PGE) are preferentially partitioned into arsenian pyrite that grows in the muds. These processes produce regionally extensive black shale and turbidite sequences enriched in syngenetic gold and arsenic, commonly from 5 to 100 ppb Au and 10 to 200 ppm As. Rare organic- and sulfide-rich metalliferous black shales may contain up to 1 to 2 ppm Au and over 1,000 ppm As, present as refractory gold in arsenian pyrite and nanoparticles of free gold.
During late diagenesis and early metamorphism (stage 2) the diagenetic arsenian pyrite is recrystallized to form coarser grained pyrite generations, and the organic matter is cooked to bitumen. Under higher grade metamorphism (lower greenschist facies and above) arsenian pyrite in carbonaceous shales is converted to pyrrhotite. These processes release gold, arsenic, sulfur and other elements (Sb, Te, Cu, Zn, Mo, Bi, Tl, and Pb) from the source rocks to become concentrated by hydrothermal processes, locally to produce gold ores, in structural sites such as fold hinge zones, shear or breccia zones within or above the black shale sequence.
LA-ICP-MS analyses of diagenetic pyrite in carbonaceous sediments, both associated and not associated with gold deposits, suggests that invisible gold contents of greater than 250 ppb in diagenetic pyrite, are indicative of carbonaceous shale source rocks with the potential to produce economic gold deposits. Application of this sedimentary source-rock model enables a systematic exploration approach for sediment-hosted gold deposits, based on the distribution, composition and structure of carbonaceous shale sequences and their contained diagenetic pyrite.
DEWEY : 553 ISSN : 0361-0128 En ligne : http://econgeol.geoscienceworld.org/cgi/content/abstract/106/3/331 Cellular stochastic control of the collective output of a class of distributed hysteretic systems / Levi B. Wood in Transactions of the ASME . Journal of dynamic systems, measurement, and control, Vol. 133 N° 6 (Novembre 2011)
[article]
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 133 N° 6 (Novembre 2011) . - 11 p.
Titre : Cellular stochastic control of the collective output of a class of distributed hysteretic systems Type de document : texte imprimé Auteurs : Levi B. Wood, Auteur ; Harry Asada, H., Auteur Année de publication : 2012 Article en page(s) : 11 p. Note générale : Dynamic systems Langues : Anglais (eng) Mots-clés : Distributed control Feedback Hysteresis Intelligent actuators Robust control Shape memory effects Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Résumé : Stable stochastic feedback control of an aggregate output from a multitude of cellular units is presented in this paper. Similar to a skeletal muscle comprising a number of muscle fibers, the plant considered in this paper consists of many independent units (called cellular units), each of which contributes to an aggregate output of the whole system. The central controller regulates the aggregate output by stochastically recruiting as many cellular units as needed for producing a required output. Two challenges are considered. The first is how to deal with individual units having pronounced hysteresis and long latency time in transient response. It will be shown that slow response and poor stability due to the hysteresis and latency time can significantly be improved by coordinating the multitude of cellular units, which are in diverse phases in the hysteresis loop. The second challenge is how to build a central controller that coordinates the multitude of cellular units without knowing the state of individual units. Stochastic broadcast feedback is presented as a solution that meets those requirements. The central controller observes only the aggregate output value rather than the output and state of each unit, compares the aggregate output against a reference, and broadcasts an error signal to all the units, which are anonymous. In turn, each cellular unit makes a control decision stochastically with state transition probabilities that are modulated by the broadcast error signal from the central controller. Stability analysis based on supermatingale theory guarantees that this stochastic broadcast feedback is stable and robust against cell failures. The method is applied to the control of shape-memory-alloy muscle actuators with cellular architecture. Despite pronounced hysteresis and long latency time, stochastic broadcast feedback can achieve fast and stable control. Simulation experiments verify the theoretical results. DEWEY : 553 ISSN : 0022-0434 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA000133000006 [...] [article] Cellular stochastic control of the collective output of a class of distributed hysteretic systems [texte imprimé] / Levi B. Wood, Auteur ; Harry Asada, H., Auteur . - 2012 . - 11 p.
Dynamic systems
Langues : Anglais (eng)
in Transactions of the ASME . Journal of dynamic systems, measurement, and control > Vol. 133 N° 6 (Novembre 2011) . - 11 p.
Mots-clés : Distributed control Feedback Hysteresis Intelligent actuators Robust control Shape memory effects Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Résumé : Stable stochastic feedback control of an aggregate output from a multitude of cellular units is presented in this paper. Similar to a skeletal muscle comprising a number of muscle fibers, the plant considered in this paper consists of many independent units (called cellular units), each of which contributes to an aggregate output of the whole system. The central controller regulates the aggregate output by stochastically recruiting as many cellular units as needed for producing a required output. Two challenges are considered. The first is how to deal with individual units having pronounced hysteresis and long latency time in transient response. It will be shown that slow response and poor stability due to the hysteresis and latency time can significantly be improved by coordinating the multitude of cellular units, which are in diverse phases in the hysteresis loop. The second challenge is how to build a central controller that coordinates the multitude of cellular units without knowing the state of individual units. Stochastic broadcast feedback is presented as a solution that meets those requirements. The central controller observes only the aggregate output value rather than the output and state of each unit, compares the aggregate output against a reference, and broadcasts an error signal to all the units, which are anonymous. In turn, each cellular unit makes a control decision stochastically with state transition probabilities that are modulated by the broadcast error signal from the central controller. Stability analysis based on supermatingale theory guarantees that this stochastic broadcast feedback is stable and robust against cell failures. The method is applied to the control of shape-memory-alloy muscle actuators with cellular architecture. Despite pronounced hysteresis and long latency time, stochastic broadcast feedback can achieve fast and stable control. Simulation experiments verify the theoretical results. DEWEY : 553 ISSN : 0022-0434 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JDSMAA000133000006 [...] Compensation of time-varying input and state delays for nonlinear systems / Nikolaos Bekiaris-Liberis in Transactions of the ASME . Journal of dynamic systems, measurement, and control, Vol. 134 N° 1 (Janvier 2012)
PermalinkComposition of the marginal rocks and sills of the rustenburg layered suite, Bushveld complex, South Africa / Sarah-Jane Barnes in Economic geology, Vol. 105 N° 8 (Décembre 2010)
PermalinkConditions for early cretaceous emerald formation at Dyakou, China / G. Xue in Economic geology, Vol. 105 N° 2 (Mars/Avril 2010)
PermalinkConnections between sulfur cycle evolution, sulfur isotopes, sediments, and base metal sulfide deposits / James Farquhar in Economic geology, Vol. 105 N° 3 (Mai 2010)
PermalinkConstraints on the timing of Co-Cu ± Au mineralization in the blackbird district, Idaho, using SHRIMP U-Pb ages of monazite and xenotime plus zircon ages of related mesoproterozoic orthogneisses and metasedimentary rocks / John N. Aleinikoff in Economic geology, Vol. 107 N° 6 (Septembre/Octobre 2012)
PermalinkContrasting patterns of alteration at the wheeler river area, Athabasca basin, Saskatchewan, Canada / Jonathan Cloutier in Economic geology, Vol. 105 N° 2 (Mars/Avril 2010)
PermalinkControls on tellurium in base, precious, and telluride minerals in the panormos Bay Ag-Au-Te deposits, Tinos Island, Cyclades, Greece / Stylianos Tombros in Economic geology, Vol. 105 N° 6 (Septembre/Octobre 2010)
PermalinkControls on the concentration of zirconium, niobium, and the rare earth elements in the thor lake rare metal deposit, northwest territories, Canada / Emma R. Sheard in Economic geology, Vol. 107 N° 1 (Janvier/Fevrier 2012)
PermalinkCopper mineralization prevented by arc-root delamination during Alpine-Himalayan collision in central Iran / Michael Haschke in Economic geology, Vol. 105 N° 4 (Juin/Juillet 2010)
PermalinkCrustal-scale fluid pathways and source rocks in the victorian gold province, australia / C. E. Willman in Economic geology, Vol. 105 N° 5 (Août 2010)
Permalink