1,720,958 research outputs found
ORE SYSTEMS: TYPES, AND GEODYNAMIC SETTINGS FOR THEIR OCCURRENCE (EASTERN SIBERIA)
Get PDFThe Mineralogy, Petrography and Minerals Department of the Irkutsk State Technical University (now the Irkutsk National Research Technical University) has been studying the structural, mineralogical and geochemical features of ore fields for over 30 years. We investigated more than 25 deposits of gold, uranium, rare, non-ferrous and ferrous metals, and published the prognostic metallogenic maps of the ore regions located in Eastern Siberia, Mongolia and Yakutia. Our experience shows that knowing only the genetic characteristics of ore objects is not sufficient for proper metallogenic studies. A complete set of deposit characteristics should include the data on structure, composition, localization conditions and other properties of ore objects and fields. We propose to introduce the “ore system” (OS) concept considering a combination of genetically (paragenetically) related and interrelated petrological, tectonic, metamorphic, mineralogical, geochemical and lithological elements formed during the pre-ore (preparatory) and ore-formation stages [Seminsky, 1990]. In contrast to the proposed OS concept, common terms, such as “ore-magmatic”, “oremetasomatic”, “ore-generating”, “ore-localizing” systems, usually consider only one aspect of the ore process or object [Russian Metallogenic Dictionary, 2003]. In our opinion, descriptions and typification of ore objects viewed as OS should refer to two groups of characteristics
CLUSTERS OF MINERAL DEPOSITS OF THE SOUTHERN EAST SIBERIA AND PROSPECTS FOR THEIR DEVELOPMENT: AN OVERVIEW OF THE PROBLEM
Get PDFThis study aims to identify the groups of closely spaced mineral deposits located in the Southern East Siberia and to describe these clusters. The mineral resource base of this region includes the deposits of lead, zinc, tungsten, tin, molybdenum, uranium, copper, gold, lithium, tantalum, niobium, silver, fluorite, zirconium, rare-earth metals, iron, mica, precious and semi-precious stones, oil, gas, and coal. Many of these deposits contain a significant part of the explored mineral reserves of Russia. The deposits are located in the tectonic structures of the Siberian platform (Tunguska syncline, Nepa arch, Cheremkhovo and Priangarie depressions), as well as in the fold belts framing the platform from the south and southeast (Baikal-Patom, Dzhida-Vitim, etc.). These structures and belts formed under the influence of plate tectonic and plume tectonic processes. This article describes the clusters of mineral deposits of the Angara, Sayan, Baikal and Transbaikalia regions. Currently, the most developed are the clusters located in the southern part of the study area (Shilka, Argun, Yeravnino, etc.). In the northern part (Mama-Bodaibo, etc.), the clusters have been either partially developed within the existing mining areas or are at the initial stage of development. In these territories, the road infrastructure, power supply and other facilities required for mining industry are either underdeveloped or lacking. Prospects for the regional development are related to the economic development of the territories adjacent to the Baikal-Amur railroad (BAM) and hydrocarbons production in the zone near the East Siberia – Far East oil pipeline. On the Siberian platform, mineral deposits formed during the stages of formation of its basement (Aldan, Anabar, and Sharyzhalgai shields) and platform cover (Tunguska syncline, and Nepa-Botuoba anticline). Within the fold frame, ore formation was associated with subduction, spreading, collision, and plume tectonic intraplate settings. To start the development of small-size deposits and mining of technogenic raw materials, it is advisable to establish exploration and production enterprises that can operate and manage expeditions and use compact ore-dressing plants
ORE SYSTEMS: TYPES, AND GEODYNAMIC SETTINGS FOR THEIR OCCURRENCE (EASTERN SIBERIA)
Get PDFThe Mineralogy, Petrography and Minerals Department of the Irkutsk State Technical University (now the Irkutsk National Research Technical University) has been studying the structural, mineralogical and geochemical features of ore fields for over 30 years. We investigated more than 25 deposits of gold, uranium, rare, non-ferrous and ferrous metals, and published the prognostic metallogenic maps of the ore regions located in Eastern Siberia, Mongolia and Yakutia. Our experience shows that knowing only the genetic characteristics of ore objects is not sufficient for proper metallogenic studies. A complete set of deposit characteristics should include the data on structure, composition, localization conditions and other properties of ore objects and fields. We propose to introduce the “ore system” (OS) concept considering a combination of genetically (paragenetically) related and interrelated petrological, tectonic, metamorphic, mineralogical, geochemical and lithological elements formed during the pre-ore (preparatory) and ore-formation stages [Seminsky, 1990]. In contrast to the proposed OS concept, common terms, such as “ore-magmatic”, “oremetasomatic”, “ore-generating”, “ore-localizing” systems, usually consider only one aspect of the ore process or object [Russian Metallogenic Dictionary, 2003]. In our opinion, descriptions and typification of ore objects viewed as OS should refer to two groups of characteristics.The Mineralogy, Petrography and Minerals Department of the Irkutsk State Technical University (now the Irkutsk National Research Technical University) has been studying the structural, mineralogical and geochemical features of ore fields for over 30 years. We investigated more than 25 deposits of gold, uranium, rare, non-ferrous and ferrous metals, and published the prognostic metallogenic maps of the ore regions located in Eastern Siberia, Mongolia and Yakutia. Our experience shows that knowing only the genetic characteristics of ore objects is not sufficient for proper metallogenic studies. A complete set of deposit characteristics should include the data on structure, composition, localization conditions and other properties of ore objects and fields. We propose to introduce the “ore system” (OS) concept considering a combination of genetically (paragenetically) related and interrelated petrological, tectonic, metamorphic, mineralogical, geochemical and lithological elements formed during the pre-ore (preparatory) and ore-formation stages [Seminsky, 1990]. In contrast to the proposed OS concept, common terms, such as “ore-magmatic”, “oremetasomatic”, “ore-generating”, “ore-localizing” systems, usually consider only one aspect of the ore process or object [Russian Metallogenic Dictionary, 2003]. In our opinion, descriptions and typification of ore objects viewed as OS should refer to two groups of characteristics
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
ТЕРРИТОРИАЛЬНЫЕ ГРУППИРОВКИ МЕСТОРОЖДЕНИЙ МИНЕРАЛЬНОГО СЫРЬЯ ЮГО-ВОСТОЧНОЙ СИБИРИ И НЕКОТОРЫЕ ПЕРСПЕКТИВЫ ИХ ОСВОЕНИЯ: ОБЗОР ПРОБЛЕМЫ
Get PDFThis study aims to identify the groups of closely spaced mineral deposits located in the Southern East Siberia and to describe these clusters. The mineral resource base of this region includes the deposits of lead, zinc, tungsten, tin, molybdenum, uranium, copper, gold, lithium, tantalum, niobium, silver, fluorite, zirconium, rare-earth metals, iron, mica, precious and semi-precious stones, oil, gas, and coal. Many of these deposits contain a significant part of the explored mineral reserves of Russia. The deposits are located in the tectonic structures of the Siberian platform (Tunguska syncline, Nepa arch, Cheremkhovo and Priangarie depressions), as well as in the fold belts framing the platform from the south and southeast (Baikal-Patom, Dzhida-Vitim, etc.). These structures and belts formed under the influence of plate tectonic and plume tectonic processes. This article describes the clusters of mineral deposits of the Angara, Sayan, Baikal and Transbaikalia regions. Currently, the most developed are the clusters located in the southern part of the study area (Shilka, Argun, Yeravnino, etc.). In the northern part (Mama-Bodaibo, etc.), the clusters have been either partially developed within the existing mining areas or are at the initial stage of development. In these territories, the road infrastructure, power supply and other facilities required for mining industry are either underdeveloped or lacking. Prospects for the regional development are related to the economic development of the territories adjacent to the Baikal-Amur railroad (BAM) and hydrocarbons production in the zone near the East Siberia – Far East oil pipeline. On the Siberian platform, mineral deposits formed during the stages of formation of its basement (Aldan, Anabar, and Sharyzhalgai shields) and platform cover (Tunguska syncline, and Nepa-Botuoba anticline). Within the fold frame, ore formation was associated with subduction, spreading, collision, and plume tectonic intraplate settings. To start the development of small-size deposits and mining of technogenic raw materials, it is advisable to establish exploration and production enterprises that can operate and manage expeditions and use compact ore-dressing plants.Целью работы является выделение и описание территориальных группировок минерального сырья южной части Восточной Сибири. Основу минерально-сырьевой базы составляют месторождения свинца, цинка, вольфрама, олова, молибдена, урана, меди, золота, лития, тантала, ниобия, серебра, флюорита, циркония, а также редких земель, железа, слюды, цветных камней, нефти, газа, угля, причем многие из них содержат значительную часть разведанных общероссийских запасов.Месторождения полезных ископаемых локализуются в пределах тектонических структур Сибирской платформы (Тунгусская синеклиза, Непский свод, Черемховская, Приангарская впадины) и складчатых поясов, обрамляющих платформу с юга и юго-востока (Байкало-Патомский, Джида-Витимский и др.), которые формировались под воздействием плитотектонических и плюмтектонических процессов. Характеризуются полезные ископаемые территориальных группировок Приангарья, Присаянья, Прибайкалья и Забайкалья. Наиболее освоенными являются группировки, расположенные в южной половине рассматриваемой территории (Пришилкинская, Приаргунская, Еравнинская и др.). Группировки северной половины площади (Мамско-Бодайбинская и др.) освоены частично, в пределах существующих горнорудных районов, или освоение их находится в начальной стадии. На этих площадях в основном отсутствуют или слабо развиты пути сообщения, энергоснабжение и другие необходимые для функционирования горнодобывающих предприятий условия. Перспективы их связываются с экономическим развитием территорий, примыкающих к линии БАМа, и с добычей углеводородов в зоне нефтепровода Восточная Сибирь – Дальний Восток. На платформе месторождения полезных ископаемых формировались на этапах образования фундамента (Алданский, Анабарский, Шарыжалгайский щиты) и платформенного чехла (Тунгусская синеклиза, Непско-Ботуобинская антеклиза). В пределах складчатого обрамления рудообразование было связано с процессами субдукции, спрединга, коллизии, плюмтектоническими внутриплитными обстановками. Целесообразно обратиться к освоению малых месторождений и техногенного сырья на основе создания разведочно-эксплуатационных предприятий с применением компактных обогатительных установок и экспедиционных методов работы
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
- …
