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Zeitschriftenartikel zum Thema „Caldie“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 18. Februar 2022

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1

Kalyon, A., und M. T. Özcan. „Experimental Investigation of the Machinability of Caldie Cold Work Tool Steel“. Acta Physica Polonica A 135, Nr. 4 (April 2019): 601–6. http://dx.doi.org/10.12693/aphyspola.135.601.

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2

Singh, Alok, Sitaram Dash, Mohammed Kamruddin, Puthupparampil K. Ajikumar, Ashok K. Tyagi, Vinjamoor S. Raghunathan und Baldev Raj. „Formation of Nanocrystalline Calcia by the Decomposition of Calcite“. Journal of the American Ceramic Society 85, Nr. 4 (20.12.2004): 927–32. http://dx.doi.org/10.1111/j.1151-2916.2002.tb00194.x.

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3

Hayden, Oliver, Usman Latif und Franz L. Dickert. „A Mass-Sensitive Approach for the Detection of Anaesthetic Xenon“. Australian Journal of Chemistry 64, Nr. 12 (2011): 1628. http://dx.doi.org/10.1071/ch11267.

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Quartz crystal microbalances (QCMs) were utilized for the detection of the noble gas xenon (Xe) by combining them with different recognition layers such as permethylated calixarenes (tetramethyl-tert-butylcalix[4]arene (Cal4Me), hexamethyl-tert-butylcalix[6]arene (Cal6Me)), and polyurethanes, with covalently embedded Cal4OH (Poly4Cal), or Cal6OH (Poly6Cal). A third type of sensitive material is synthesized from polyacrylic acid (PAA) and polyvinyl alcohol (PVA) and utilized as a sensitive coating. The results demonstrate that the Cal4Me layer gives higher response towards Xe, while, by the use of a second uncoated QCM channel, the influence of ambient humidity could be nearly completely compensated by signal subtraction. Moreover, the Cal4Me sensor shows excellent reversibility and rapid response time, providing a potentially reliable way to determine Xe during anaesthesia.

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4

Melfos, Vasilios, Panagiotis Voudouris, Margarita Melfou, Matías G. Sánchez, Lambrini Papadopoulou, Anestis Filippidis, Paul G. Spry et al. „Mineralogical Constraints on the Potassic and Sodic-Calcic Hydrothermal Alteration and Vein-Type Mineralization of the Maronia Porphyry Cu-Mo ± Re ± Au Deposit in NE Greece“. Minerals 10, Nr. 2 (18.02.2020): 182. http://dx.doi.org/10.3390/min10020182.

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The Maronia Cu-Mo ± Re ± Au deposit is spatially related to a microgranite porphyry that intruded an Oligocene monzonite along the Mesozoic Circum-Rhodope belt in Thrace, NE Greece. The magmatic rocks and associated metallic mineralization show plastic and cataclastic features at the south-eastern margin of the deposit that implies emplacement at the ductile-brittle transition, adjacent to a shear zone at the footwall of the Maronia detachment fault. The conversion from ductile to brittle deformation caused a rapid upward magmatic fluid flow and increased the volume of water that interacted with the host rocks through high permeable zones, which produced extensive zones of potassic and sodic-calcic alteration. Potassic alteration is characterized by secondary biotite + K-feldspar (orthoclase) + magnetite + rutile + quartz ± apatite and commonly contains sulfides (pyrite, chalcopyrite, pyrrhotite). Sodic-calcic alteration consists of actinolite + sodic-calcic plagioclase (albite/oligoclase/andesine) + titanite + magnetite + chlorite + quartz ± calcite ± epidote-allanite. The high-oxidation state of the magmas and the hydrothermal fluid circulation were responsible for the metal and sulfur enrichments of the aqueous fluid phase, an increase in O2 gas content, the breakdown of the magmatic silicates and the production of the extensive potassic and sodic-calcic alterations. Brittle deformation also promoted the rapid upward fluid flow and caused interactions with the surrounding host rocks along the high temperature M-, EB-, A- and B-type veins.

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Sobecki, T. M., und A. D. Karathanasis. „Quantification and Compositional Characterization of Pedogenic Calcite and Dolomite in Calcic Horizons of Selected Aquolls“. Soil Science Society of America Journal 51, Nr. 3 (Mai 1987): 683–90. http://dx.doi.org/10.2136/sssaj1987.03615995005100030024x.

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6

Pan, Yuanming, und Michael E. Fleet. „Mineralogy and genesis of calc-silicates associated with Archean volcanogenic massive sulphide deposits at the Manitouwadge mining camp, Ontario“. Canadian Journal of Earth Sciences 29, Nr. 7 (01.07.1992): 1375–88. http://dx.doi.org/10.1139/e92-111.

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Skarn-like calc-silicate rocks are reported in spatial association with the Archean Cu–Zn–Ag massive sulphide deposits at the Manitouwadge mining camp, Ontario. Calc-silicates in the footwall of the Willroy mine occur as matrix to breccia fragments of garnetiferous quartzo-feldspathic gneiss and as lenses within garnetiferous quartzo-feldspathic gneiss and are composed of clinopyroxene, garnet, calcic amphiboles, wollastonite, plagioclase, K-feldspar, epidote, quartz, calcite, magnetite, and minor sulphides. Calc-silicates within the main orebody of the Geco mine are characterized by clinopyroxene, calcic amphiboles (Cl–K-rich hastingsitic and ferro-edenitic hornblende, ferro-edenite (up to 4.7 wt.% Cl); and ferroactinolite (6.7 wt.% MnO)), garnet, epidote (including an epidote rich in rare-earth elements and Cl), calcite, quartz, and abundant sulphides. Calc-silicates within the basal 4/2 Copper Zone of the Geco mine contain garnet, gahnite, sphalerite, ferroactinolite (8.5 wt.% MnO), epidote, quartz, biotite, plagioclase, chlorite, muscovite, K-feldspar, and pyrosmalite (with Mn/(Mn + Fe) ratio ranging from 0.21 to 0.61, and up to 3.9 wt.% Cl). The calc-silicates probably represent metasomatic remobilization of dispersed Ca (and Cl) from sea-floor hydrothermal alteration of mafic to intermediate volcanic rocks and are only indirectly related to the hypothesized syngenetic ore-forming processes for the associated base metal sulphide deposits. The calc-silicates formed initially at about 600 °C and 3–5 kbar (1 kbar = 100 MPa) in a mildly reducing environment (from 1 log unit above to 1 log unit below the fayalite–magnetite–quartz buffer) during the upper-amphibolite- to granulite-facies regional metamorphism and were altered subsequently at lower temperatures (<500 °C).

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Muñoz García, Andrés Mauricio, Martín Eduardo Espitia Nery, Edgar Ricardo Monroy und Henry Yesid Bustos Castañeda. „Estudio de patologías superficiales en piezas cerámicas del sector productivo de Supía Caldas“. INVENTUM 10, Nr. 19 (06.07.2015): 75–81. http://dx.doi.org/10.26620/uniminuto.inventum.10.19.2015.75-81.

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El presente artículo muestra la metodología y los resultados de un proceso experimental de identificación y prevención de eflorescencias de piezas cerámicas de construcción fabricadas en Supía en el departamento de Caldas-Colombia, las cuales manifiestan una serie de patologías. Éstas fueron causadas —de acuerdo a documentación bibliográfica— por sales solubles de sodio, potasio, calcio, magnesio y óxido de vanadio presentes en la materia prima y las partes finalizadas. Una muestra de materia prima y una serie de probetas moldeadas y quemadas en condiciones industriales fueron analizadas por espectrofotometría de absorción atómica y microscopia electrónica de barrido (SEM) para determinar la cantidad de sulfatos, así como los diferentes elementos metálicos que pueden generar eflorescencias calcáreas como es el caso del sulfato de calcio (Ca2SO4), sulfato de potasio (K2SO4), sulfato de magnesio (MgSO4) y sulfato de sodio (Na2SO4), además de la eflorescencia de vanadio por exceso de óxido de vanadio (vO2) en la muestra; también fue analizada una muestra de agua de uso industrial y, finalmente, se propuso un método de solución a las patologías identificadas.

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Dasgupta, Somnath, P. K. Bhattacharya, G. Chattopadhyay, H. Banerjee, N. Majumdar, M. Fukuoka und Supriya Roy. „Petrology of Mg-Mn amphibole-bearing assemblages in manganese silicate rocks of the Sausar Group, India“. Mineralogical Magazine 52, Nr. 364 (März 1988): 105–11. http://dx.doi.org/10.1180/minmag.1988.052.364.09.

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AbstractMg-Mn amphibole (tirodite), with or without pyroxmangite in the total absence of pyroxenes and high-calcic pyroxenoids, occurs in the Mn silicate rocks of the Sausar Group, India. The rocks were metamorphosed to amphibolite facies condition (T ∼ 650°C, P ∼ 6 kbar). Tirodite-pyroxmangite pairs developed in both carbonate-free and rhodochrosite-bearing assemblages. Also tirodite coexists with either kutnahorite or manganoan calcite in the absence of pyroxmangite. Mineral reactions inferred from modal abundances and compositions of the phases indicate stabilization of the amphibole alone from a bivalent cation-bearing residual unbuffered XCO2 system with XMn < 0.3. On the other hand, tirodite-pyroxmangite pairs appeared in unbuffered low to intermediate XCO2 assemblages with XMn > 0.35. Pyroxenes and high-calcic pyroxenoids did not appear in the present situation, though they occur elsewhere in rocks with broadly similar contents of immobile components. Closely associated assemblages of diverse mineralogy suggest that the XMn and XCO2, rather than the physical conditions of metamorphism, are the decisive factors in promoting the observed phase assemblages.

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9

Шабанов, Тимофей. „Ценовой паритет калорийности“. ИЗВЕСТИЯ ДАЛЬНЕВОСТОЧНОГО ФЕДЕРАЛЬНОГО УНИВЕРСИТЕТА. ЭКОНОМИКА И УПРАВЛЕНИЕ, Nr. 4 (2020): 149–55. http://dx.doi.org/10.24866/2311-2271/2020-4/149-155.

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В чрезвычайной ситуации государственной самоизоляции актуализируется вопросы продовольственной безопасности  ценового паритета калорийности продуктов питания. В исследовании рассмотрена и подтверждена гипотеза о существовании взаимосвязи цены с калорийностью продовольствия как ценового паритета. На основе методов эконометрики и энергетического подхода, данных Росстат за 1998-2017 гг. определены цены и калорийности по видам продовольствия. Выявлен линейный характер годового прироста цены калории при стабильном ценовом паритете. Установлены среднегодовые темпы прироста цены потреблённого продовольствия  1,77 руб./Мкал к произведённому 0,38 руб./Мкал (отношение 4,66:1), средняя цена импортной калории  1,24 USD/Мкал, экспортной 0,16 USD/Мкал (отношение 7,75:1). Импортозамещение как основное направление улучшения ценового паритета обеспечит продовольственную безопасность в чрезвычайной ситуации. In the emergency situation of the state self-isolation food security issues – caloric food price parity - are brought up to date. The level of food prices can be a kind of the regulator for planning, organizing and managing the optimal calorie intake by the population. The paper suggests the existence of a function between price and calorie content (number of calories); and the hypothesis on availability of the caloric food price parity was considered and tested. To study the hypothesis, the following objectives were developed and consistently solved: determining the prices and parity of calories produced and consumed; determination of prices and parities of exported and imported calories. Based on the econometric methods and energy approach, as well as on the Rosstat data for the period of 1990-2017 and the Russian Customs data on food product balances and its prices, the wellknown calorie standards for food products, the hypothesis of the investigation was confirmed. The linear nature of the annual increase in the price of calories at the stable price parity was defined. It was found that the average annual growth rate of the consumed food price was 1.77 rubles/Mcal to the produced 0.38 rubles/Mcal (ratio 4.66: 1), the average price of the imported calories was 1.24 USD / Mcal and that of the exported calories was 0.16 USD / Mcal ( ratio 7.75: 1). Import substitution as the main trend for improving the price parity will ensure food security in an emergency situation.

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Lorgouilloux, Marion, Robert Gaertner und Thierry Chopin. „An Innovative Low Density Synthetic Carbonate with a Composite Structure“. Key Engineering Materials 617 (Juni 2014): 3–9. http://dx.doi.org/10.4028/www.scientific.net/kem.617.3.

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A new low density mineral material has been synthesized via a simple, flexible, cheap and easy to control process. This material is a synthetic carbonate produced by carbonation of a solid phase composed of a calcic part and a magnesian part. Typically, its production process includes the calcination of a raw dolomite (general formula CaCO3.MgCO3) into the oxide form, followed by an at least partial hydration of this oxide and a subsequent carbonation step. This process is thus close to the well-known process used for the production of Precipitated Calcium Carbonate (PCC), a common filler and pigment in plastic, paper and rubber, except that the raw material is a dolomite instead of a limestone. It has to be pointed out that flue gases from different industries can be used as a source of CO2 for the carbonation. Many parameters have been studied, such as the hydration conditions or the carbonation conditions, allowing the production of a whole range of products. The products obtained via this process are composed of a calcic part, mainly as calcite and aragonite (CaCO3), and a magnesium containing part, mainly as hydromagnesite (4MgCO3.Mg (OH)2.4H2O). Compared to standard PCC, this material has a particularly low density (100-250 kg/m3 instead of 300-600 kg/m3 for standard PCC), a rather high BET specific surface area (15-35 m2/g instead of 4-15 m2/g for standard PCC) and a specific particle morphology and structure. The particles are indeed commonly spherical particles composed of a core of calcite/aragonite covered by a layer of hydromagnesite. This structure can be described as a core-shell structure. Due to these special features, this product could be used in multiple applications, such as raw material for the manufacture of insulation material, flame retardant, filler in plastics, paints, paper, rubber, and many more.

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11

Jiménez-Franco, Abigail, Carles Canet, Pura Alfonso, Eduardo González-Partida, Abdorrahman Rajabi und Edgar Escalante. „The Velardeña Zn–(Pb–Cu) skarn-epithermal deposits, central-northern Mexico: New physical-chemical constraints on ore-forming processes“. Boletín de la Sociedad Geológica Mexicana 72, Nr. 3 (28.11.2020): A270719. http://dx.doi.org/10.18268/bsgm2020v72n3a270719.

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The Velardeña mining district is economically the most important of Durango state. The ore deposits occur in different skarn zones developed within the intrusive contact between Mesozoic limestones and Eocene granitic stocks and dikes. The most important ore deposits are related to the Santa María dike and Reyna de Cobre porphyritic stock (separated from each other by 10 km). They occur as irregularly shaped replacement masses developed near the intrusive contact and have a skarn paragenesis dominated by calc-silicates and sulfides. The mineral assemblages show replacement textures and are dominated by calcic clinopyroxene (Di97-53Hd42-02Jh04-01) and garnet (Ad100-57Grs43-00) in the exoskarn, with wollastonite particularly abundant in the endoskarn. Hydrous silicates are actinolite, epidote, and chlorite, whereas sulfides include pyrite, sphalerite, pyrrhotite, galena, chalcopyrite, and sulfosalts. Scheelite, hematite, quartz, and calcite are also present. According to sphalerite geobarometry, the skarns formed at hypabyssal depths (~3–4 km). They developed by a succession of replacive mineralizing events, including (a) a prograde stage at temperatures from ≥470 to 335 °C in conditions of low f (CO2), followed by (b) a retrograde stage from 335 to 220 °C. There was a general increase in f (O2), accompanying the temperature decline during the formation of the system, which accounts for a process of mixing with cooler, oxidizing, and dilute water. During the retrograde stage, wollastonite, calcic garnet and clinopyroxene formed. On the other hand, hydrous silicates, sulfides, sulfosalts, scheelite, and hematite crystallized during the retrograde stage. Skarn mineralization is crosscut by veins of calcite, fluorite, adularia, and sphalerite. The vein mineralization formed at temperatures below 200 °C. The different ore deposits of Velardeña constitute a telescoped skarn–epithermal mineral system.

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Siriprom, W., K. Teanchai, K. Kirdsiri und J. Kaewkhao. „Characterization of Calcium Hydroxide Derived from Waste Eggshell upon Moisture Effect“. Advanced Materials Research 979 (Juni 2014): 435–39. http://dx.doi.org/10.4028/www.scientific.net/amr.979.435.

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The structural transformations of chicken eggshell sample upon heat treatments and water absorption have been studied after having ground the shells into powders. Structural identifications of chicken eggshell samples were performed by using x-ray diffraction, IR spectroscopy and Energy Dispersive X-rays spectrometer (EDXRF). It was found that the specimen is made of calcite, a common phase of CaCO3 mineral. An then annealing at different temperatures in the range of 300-600C, The chicken eggshell not transformation, but after heat treatment at temperature 900C, the chicken eggshell sample have been transform structural in to oxide compound with calcia phase. In addition, the chicken eggshells have been preparation calcium hydroxide via a water steam route.

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13

Elliott, Jack D. „Looking for Callie Barr“. Mississippi Quarterly 65, Nr. 3 (2012): 423–35. http://dx.doi.org/10.1353/mss.2012.0015.

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14

Gastaldo, Robert A., Kaci Kus, Neil Tabor und Johann Neveling. „Calcic Vertisols in the upper Daptocephalus Assemblage Zone, Balfour Formation, Karoo Basin, South Africa: Implications for Late Permian Climate“. Journal of Sedimentary Research 90, Nr. 6 (05.06.2020): 609–28. http://dx.doi.org/10.2110/jsr.2020.32.

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ABSTRACT The fully continental succession of the Beaufort Group, Karoo Basin, South Africa, has been used in the development of environmental models proposed for the interval that spans the contact between the Daptocephalus to Lystrosaurus Assemblage Zones, associated by some workers with the end-Permian extinction event. An aridification trend is widely accepted, yet geochemical data indicate that the majority of in situ paleosols encountered in this interval developed in waterlogged environments. To date, the presence of calcic paleosols in the latest Permian can be inferred only from the presence of calcite-cemented pedogenic nodules concentrated in fluvial channel-lag deposits. Here, we report on the first empirical evidence of in situ calcic Vertisols found in the upper Daptocephalus Assemblage Zone near Old Wapadsberg Pass, one of eight classic localities in which the vertebrate turnover is reported in the Karoo Basin. Seven discrete intervals of calcic Vertisols, exposed over a very limited lateral extent, occur in an ∼ 25 m stratigraphic interval. Estimates of mean annual temperature and mean annual precipitation are calculated from geochemical measurements of one paleosol, and these estimates indicate that the prevailing climate at the time of pedogenesis was seasonally cold and humid. Correlation with adjacent stratigraphic sections indicates that the late Permian landscape experienced poorly drained and better-drained phases, interpreted to reflect a climate that varied between episodically dry and episodically wet. In contrast to a paleoenvironmental reconstruction of unidirectional aridification from strata in the Wapadsberg Pass region, this study provides new evidence for a wetting trend towards the Daptocephalus–Lystrosaurus Assemblage-Zone boundary.

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Yang, Kuifeng, Hongrui Fan, Franco Pirajno und Xiaochun Li. „The Bayan Obo (China) giant REE accumulation conundrum elucidated by intense magmatic differentiation of carbonatite“. Geology 47, Nr. 12 (15.10.2019): 1198–202. http://dx.doi.org/10.1130/g46674.1.

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Abstract The Bayan Obo deposit in China is endowed with the largest rare earth element (REE) resource in the world. The mechanism resulting in this REE enrichment has been the focus of many studies. Carbonatite is known globally as the most favorable carrier of REE ores. In the Bayan Obo deposit, REE ores are hosted in dolomites (including coarse-grained and fine-grained varieties), and many carbonatite dikes (ferroan, magnesian, and calcic) have been identified. All of the dolomites and carbonatite dikes appear to be broadly coeval and possess similar geochemical characteristics. The Sm-Nd isochron age of apatite (1317 ± 140 Ma) from coarse-grained dolomite is consistent with the Th-Pb age of monazite (1321 ± 14 Ma) from a calciocarbonatite dike. The εNd(t) values and initial 87Sr/86Sr ratios at 1.3 Ga of apatite from coarse-grained dolomite show a tight cluster between −2.5 and +1.0 and between 0.70266 and 0.70293, respectively. The δ18OVSMOW values (relative to Vienna standard mean ocean water) of apatite also vary narrowly from 5.0‰ to 6.2‰. These results are consistent with primary mantle-derived carbonatite and prove a magmatic origin for the ore-hosting dolomite. Furthermore, the rim and core texture of dolomite and calcite in the magnesian and calcic carbonatite dikes shows that carbonatite at Bayan Obo has an evolutionary sequence from ferroan through magnesian to calcic in nature. There is a clear negative correlation between the iron content and REE concentration in different stages of carbonatite. Intense magmatic differentiation of carbonatite is likely the critical factor for the giant REE accumulation.

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Stevenson, Deborah. „Callie Cat, Ice Skater (review)“. Bulletin of the Center for Children's Books 61, Nr. 4 (2007): 190. http://dx.doi.org/10.1353/bcc.2007.0851.

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17

Coombs, D. S., C. A. Bosel, Y. Kawachi und L. A. Paterson. „A silica-deficient, shallow-marine zeolite assemblage in the Foveaux Formation, Bluff Peninsula, New Zealand“. Mineralogical Magazine 69, Nr. 2 (April 2005): 137–44. http://dx.doi.org/10.1180/0026461056920241.

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AbstractA gonnardite-thomsonite-chabazite-calcite assemblage forms a cement in the Foveaux Formation, a fossiliferous gabbroic boulder bed that accumulated at the base of a sea cliff cut in a Permian igneous complex during late Oligocene±early Miocene time. Gonnardite was the earliest zeolite to form, locally following minor calcite. It was followed epitaxially by thomsonite, co-precipitating with chabazite. Crystal habits indicate a low-temperature origin. The maximum temperature to which the deposit may have been subjected is estimated as not more than ∽30°C. The chabazites are Ca-poor chabazite-K and chabazite-Na. Representative electron microprobe analyses are as follows, all + nH2O:thomsonite: Na3.77Ca7.73(Al19.39Si20.65)O80 and Na3.78K0.04Ca7.25Mg0.05(Al19.13Si21.05)O80;gonnardite: Na6.95K0.03Ca4.73(Al16.99Si23.15)O80 and Na8.56K0.03Ca4.05(Al17.32Si22.84)O80;chabazite-K: Na1.18K1.72Ca0.08Mg0.23(Al3.51Si8.49)O24 and Na1.67K1.92Ca0.18Mg0.17(Al4.11Si7.85)O24;chabazite-Na: Na2.51K1.13Ca0.17Mg0.02(Al4.08Si7.93)O24.Such a Si-poor zeolite assemblage is unusual for marine sediments and is attributed to precipitation from marine water impoverished in silica in the gabbroic boulder bed and interacting with shell material and calcic plagioclase. In contrast, a dioritic clast in the boulder bed provides an example of less silica-poor zeolites originally formed in the parent igneous complex. Veinlets in the clast contain scolecite averaging Na1.19Ca7.36(Al15.84Si24.14)O80.nH2O, and mesolite averaging Na5.13K0.03Ca5.24 (Al15.93Si24.13)O80.nH2O, in part as sub-microscopic intergrowths. The composition of scolecite closely corresponds to the most Na-rich scolecite reported hitherto.

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SANTOSH, M., V. J. RAJESH, T. TSUNOGAE und S. ARAI. „Diopsidites from a Neoproterozoic–Cambrian suture in southern India“. Geological Magazine 147, Nr. 5 (04.03.2010): 777–88. http://dx.doi.org/10.1017/s0016756810000154.

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AbstractWe report the occurrence and characteristics of diopsidite dykes and veins from the Palghat-Cauvery Suture Zone (PCSZ) marking the boundary between the Archaean Dharwar craton to the north and the Proterozoic Madurai Block to the south, which is considered as a trace of the Cambrian Gondwana suture zone in southern India. The diopsidites are composed predominantly of coarse crystals of diopside [Mg no. (100 Mg/(Mg+Fetot)) up to 89] surrounded by retrograde calcic amphibole, plagioclase and phlogopite with accessory titanite and calcite. The major, trace and rare earth element characteristics of the diopside crystals suggest their formation in a subduction zone setting. We correlate the petrogenesis of the diopsidites with the tectonics associated with the subduction and closure of the Neoproterozoic Mozambique Ocean prior to the final collisional assembly of the Gondwana supercontinent in Cambrian.

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Pérez-Huerta, Alberto, Jean-Pierre Cuif, Yannicke Dauphin und Maggie Cusack. „Crystallography of calcite in pearls“. European Journal of Mineralogy 26, Nr. 4 (03.09.2014): 507–16. http://dx.doi.org/10.1127/0935-1221/2014/0026-2390.

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20

Voudouris, P., A. Xinou, C. Kanellopoulos, M. Kati, C. Mavrogonatos und P. Lyberopoulos. „A new occurrence of pyrophanite from the amphibolite-hosted skarn in Western Kimmeria, Xanthi, Northern Greece.“ Bulletin of the Geological Society of Greece 47, Nr. 1 (05.09.2013): 487. http://dx.doi.org/10.12681/bgsg.11027.

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A new occurrence of pyrophanite (MnTiO3) in Greece is described from the garnetclinopyroxene-wollastonite exoskarn of western Kimmeria. Hostrock of the pyrophanite-bearing skarn is amphibolite (retrogressed eclogites) of the Nestos suture zone in the Rhodope massif. In addition endo- and exo-skarns occur both in the Xanthi granodiorite and the surrouding marbles and consinst of diopside-vesuvianitequartz and wollastonite-garnet-calcite-quartz respectively. Pyrophanite formed in the prograde stage, together with garnet, pyroxene, wollastonite, titanite, zircon, rutile, thorite and ouranothorianite. Retrograde minerals are quartz, epidote, calcite, hematite, and sulfides. Chlorite-geothermometry revealed temperatures in the range from 300 to 350 oC for the retrograde event. Calcic garnets (andraditegrossular solid solutions) from the prograde amphibolite-hosted skarn are chemically zoned with either isotropic or anisotropic cores surrounded by non-cubic anisotropic rims, thus suggesting chemical disequilibrium or disordering phenomena during crystal growth. The pyrophanite crystals are included in titanite and are accompanied by U-rich thorium minerals (uranothorianite, thorite) and by rutile. Electron microprobe analyses indicate that the studied pyrophanites are solid solutions between end-member pyrophanite and ilmenite, with isomorphous substitution of Mn2+ by Fe2+. No Mg has been detected (geikielite end-member). The alteration of pyrophanite and rutile to titanite suggests an increase of fO2 values of the fluids, probably due to increased incursion of meteoric waters to the system. The assemblage thorite, uranothorianite, pyrophanite and zircon indicates a magmatic contribution from the Xanthi granodiorite.

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Ястребинский, Roman Yastrebinskiy, Павленко und Zoya Pavlenko. „STRUCTURAL AND PHASE TRANSFORMATIONS IN THE FeO-SiO2 CaO-FeO I SYSTEM AT INFLUENCE OF HIGH TEMPERATURES“. Bulletin of Belgorod State Technological University named after. V. G. Shukhov 1, Nr. 12 (11.11.2016): 165–69. http://dx.doi.org/10.12737/22714.

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In work structural and phase transformations in two-component the iron oxides systems are considered at high-temperature influence, on the example of bivalent oxide of iron and oxides of calcium and silicon, by the being one of the main components of cement binding. Taking into account structure of a radiation protective composite ratios of FeO:CaO =2:1 and FeO:SiO2=4:1 are considered. Heat treatment of the FeO:CaO system in the recovery environment intensified dissociation of calcite and displaced her to the low temperatures area (from 700-1000 °C in the oxidizing environment to 600–800 °C) that is caused by influence of iron of various valency (first of all magnetite) on an ionic lattice of calcite. At 600 °C there is a formation of monocalcic ferrite. In process of enrichment of the СаО system in the range of 700–800 °C monocalcic ferrite passed into two-calcic. Formation of ferrite happens at continuous change of a valent and coordination condition of ions of iron and degree of an ionnost and covalence of a chemical bond of Fe-O in ferriferous complexes. In the FeO-SiO2 system it is established: modification transition of quartz in kristobalit began at 800 °C and intensively develops at 900 °C, against 1200 °C in oxidizing conditions; to modification transition of quartz in kristobalit formation of silicon dioxide with partially amorphous structure in the range of 600–700 °C consisting of ring structural elements from [SiO4] - tetrahedrons preceded.

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Correa-Cabrera, R., A. Capote, M. N. Rodríguez-Ayán und M. A. Grompone. „Caracterización de grasas para caldos deshidratados“. Grasas y Aceites 50, Nr. 1 (28.02.1999): 30–36. http://dx.doi.org/10.3989/gya.1999.v50.i1.633.

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Celoto, Mercia, Marli de Fátima Stradioto Papa und Fernando Juari Celoto. „EFFECT OF SYRUPS ON Corynespora cassiicola“. Nucleus 11, Nr. 2 (30.10.2014): 453–58. http://dx.doi.org/10.3738/1982.2278.1007.

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Rue, Ginger. „Remembering Aunt Callie and Mr. William“. Faulkner Journal 23, Nr. 2 (2008): 43–45. http://dx.doi.org/10.1353/fau.2008.0010.

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Chamorro-Caicedo, Luz Stella. „UNIVERSIDAD DE CALDAS: UN ESPACIO PARA LA RECONCILIACIÓN Y CONSTRUCCIÓN DE PAZ DESDE EL TERRITORIO EN LA DORADA, CALDAS“. Eleuthera, Nr. 15 (05.10.2016): 101–22. http://dx.doi.org/10.17151/eleu.2016.15.7.

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Jeon, Jae-Seung, Seong-Jin Hwang, Ji-Hwan Ahn und Hyung-Sun Kim. „Surface Morphology and Reflectance of Calcite Filler in Glass Composites“. Korean Journal of Materials Research 19, Nr. 8 (27.08.2009): 407–11. http://dx.doi.org/10.3740/mrsk.2009.19.8.407.

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Bishop, Michael, und Salah Stétié. „Le calame“. World Literature Today 72, Nr. 1 (1998): 106. http://dx.doi.org/10.2307/40153559.

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Thiéry, Sébastien. „Considérant Calais“. Multitudes 62, Nr. 1 (2016): 23. http://dx.doi.org/10.3917/mult.062.0023.

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El-Mofty, S. E., und A. A. El-Midany. „Calcite–oleate–oxalate interaction in calcite flotation system“. Particulate Science and Technology 35, Nr. 6 (10.06.2016): 699–703. http://dx.doi.org/10.1080/02726351.2016.1194349.

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Andersen, Tom. „Carbonatite-related contact metasomatism in the Fen complex, Norway: effects and petrogenetic implications“. Mineralogical Magazine 53, Nr. 372 (September 1989): 395–414. http://dx.doi.org/10.1180/minmag.1989.053.372.01.

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AbstractIn the Fen complex (Telemark, S.E. Norway), carbonatites of different compositions have penetrated feldspathic fenites (alkali feldspar(s) + aegirine augite ± alkali amphibole) or older carbonatites, inducing different types of contact metasomatic alterations in their wall-rocks. (1) Pyroxene søvite has induced alkali metasomatism (i.e. fenitization s.s.), with alkali feldspars remaining stable and aegirine-augite transformed to nearly pure aegirine. (2) Søvite and dolomite carbonatite with phlogopite and/or alkali or alkali-calcic amphibole have caused replacement of feldspathic fenite by phlogopite, i.e. magnesium metasomatism. (3) Granular (dyke facies) ferrocarbonatite has increased the ferromagnesian components in calcite in wall-rock søvite. (4) Heterogeneous (pyroclastic) ferrocarbonatite induced pseudomorphic replacement of phlogopite by chlorite (leaching of alkalis). The different contact metasomatic processes reflect contrasts in compositional character among carbonatite magmas in the Fen complex, which may be evaluated in terms of differences in alkali and magnesium carbonate activities. The different types of carbonatite magma represent the products of local evolutionary trends, and are genetically related to spatially associated silicate rocks, rather than to a single ‘primitive’ carbonatite parent magma.

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Sarp, Halil, und Radovan Černý. „Calcio-andyrobertsite-2O, KCaCu5(AsO4)4[AsO2(OH)2]2H2O: its description, crystal structure and relation with calcio-andyrobertsite-1M“. European Journal of Mineralogy 16, Nr. 1 (23.02.2004): 163–69. http://dx.doi.org/10.1127/0935-1221/2004/0016-0163.

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Milinovic, Jelena, Ágata Alveirinho Dias, Ana I. Janeiro, Manuel F. C. Pereira, Sofia Martins, Sven Petersen und Fernando J. A. S. Barriga. „XRD Identification of Ore Minerals during Cruises: Refinement of Extraction Procedure with Sodium Acetate Buffer“. Minerals 10, Nr. 2 (12.02.2020): 160. http://dx.doi.org/10.3390/min10020160.

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The on-board identification of ore minerals during a cruise is often postponed until long after the cruise is over. During the M127 cruise, 21 cores with deep-seafloor sediments were recovered in the Trans-Atlantic Geotraverse (TAG) field along the Mid Atlantic Ridge (MAR). Sediments were analyzed on-board for physicochemical properties such as lightness (L*), pH and Eh. Selected samples were studied for mineral composition by X-ray powder diffraction (XRD). Based on XRD data, sediment samples were separated into high-, low- and non-carbonated. Removal of carbonates is a common technique in mineralogical studies in which HCl is used as the extraction agent. In the present study, sequential extraction was performed with sodium acetate buffer (pH 5.0) to remove carbonates. The ratio between the highest calcite XRD reflection in the original samples (Iorig) vs its XRD-reflection in samples after their treatment with the buffer (Itreat) was used as a quantitative parameter of calcite removal, as well as to identify minor minerals in carbonated samples (when Iorig/Itreat > 24). It was found that the lightness parameter (L*) showed a positive correlation with calcite XRD reflection in selected TAG samples, and this could be applied to the preliminary on-board determination of extraction steps with acetate buffer (pH 5.0) in carbonated sediment samples. The most abundant minerals detected in carbonated samples were quartz and Al- and Fe-rich clays. Other silicates were also detected (e.g., calcic plagioclase, montmorillonite, nontronite). In non-carbonated samples, Fe oxides and hydroxides (goethite and hematite, respectively) were detected. Pyrite was the dominant hydrothermal mineral and Cu sulfides (chalcopyrite, covellite) and hydrothermal Mn oxides (birnessite and todorokite) were mineral phases identified in few samples, whereas paratacamite was detected in the top 20 cm of the core. The present study demonstrates that portable XRD analysis makes it possible to characterize mineralogy at cored sites, in particular in both low- and high-carbonated samples, before the end of most cruises, thus enabling the quick modification of exploration strategies in light of new information as it becomes available in near-real time.

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Mueller, Andreas G. „The Savage Lode magnesian skarn in the Marvel Loch gold–silver mine, Southern Cross greenstone belt, Western Australia. Part 1: Structural setting, petrography, and geochemistry“. Canadian Journal of Earth Sciences 28, Nr. 5 (01.05.1991): 659–85. http://dx.doi.org/10.1139/e91-059.

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The Marvel Loch mine in the Archean Yilgarn Block. Western Australia, has produced 9.70 t gold and 1.92 t silver from 3.28 × 106 t of oxide–sulphide ore. The deposit is located in the Southern Cross greenstone belt, and occurs within the medium-grade metamorphic aureole of the Ghooli Dome granitoid batholith, about 1.5 km from the granitoid–greenstone contact, The deposit is controlled by a broad ductile shear zone and spatially associated with late syn- to post-mineralization pegmatite dykes. The major orebodies, represented by the Savage Lode, are hosted by a uniform sequence of metakomatiites, and form zoned replacement bodies oriented subparallel to the steeply dipping foliation of the shear zone. Lens-shaped domains of pillowed metakomatiiles (hornblende + cummingtonite + chlorite) are locally preserved between the orebodies.The gangue of the Savage Lode is laterally zoned, and shows distinct similarities to Phanerozoic magnesian skarns. Calcite–olivine rock and calcite–phlogopite–chlorite schist occur in the centre, and are enveloped by three types of calcite-poor ore, namely banded diopside–amphibole rock, quartz–diopside veins, and tremolite–phlogopite schist. The latter grades laterally into subeconomic, outer tremolite–chlorite schists. Local retrogression of prograde alteration minerals is evident in the partial replacement of olivine by iddingsite and serpentine, and in the occurrence of late muscovite, clinozoisite, and prehnite. The gangue in the lode reflects strong carbon dioxide, calcium, and potassium metasomatism.Hydrothermal oxides and sulphides (2–5 vol.%) occur disseminated throughout the Savage Lode. The oxide assemblage includes hercynite–spinel, magnetite, ilmenite, and scheelite, whereas the sulphide assemblage is dominated by pyrrhotite, loellingite, and arsenopyrite. Native gold occurs as discrete grains (0.001–3 mm) intergrown with sulphides or enclosed in gangue minerals. The average magnesian ore skarn is characterized by a MgO–FeO ratio of 2.0:1, a Au–Ag ratio of 1.7:1, and low base metal (< 500 ppm), anomalous tungsten (20–40 ppm), and high arsenic (2900 ppm) contents. The Savage and other lodes in the Marvel Loch mine may be classified as gold or gold–silver skarns by economic metal content. The magnesian rather than calcic nature of the Marvel Loch skarns is related to the high magnesium content (21 wt.% MgO) of the precursor metakomatiite rocks.

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Hargrove, Kathy. „From the Classroom: The Case of Callie“. Gifted Child Today 32, Nr. 1 (Januar 2009): 32–33. http://dx.doi.org/10.4219/gct-2009-844.

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Vo-Thanh, D., und Diep-The-Hung. „Theoretical study of the elastic constants of calcite at the transition calcite I-calcite II“. Physics of the Earth and Planetary Interiors 39, Nr. 1 (Juni 1985): 62–71. http://dx.doi.org/10.1016/0031-9201(85)90115-3.

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Cho, Soo-Hyun, Jin-Hyoung Kim, Pil-Nam Seong, Yeon-Ho Choi, Beom-Young Park, Yeon-Jung Lee, Tae-Sik In, Sun-Young Chun und Yong-Kon Kim. „Cholesterol, Free Amino Acid, Nucleotide-related Compounds, and Fatty Acid Composition of Korean Hanwoo Bull Beef“. Korean Journal for Food Science of Animal Resources 27, Nr. 4 (30.12.2007): 440–49. http://dx.doi.org/10.5851/kosfa.2007.27.4.440.

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Bonev, Ivan K., Juan Manuel Garcia-Ruiz, Radostina Atanassova, Fermin Otalora und Svetoslav Petrussenko. „Genesis of filamentary pyrite associated with calcite crystals“. European Journal of Mineralogy 17, Nr. 6 (04.01.2006): 905–13. http://dx.doi.org/10.1127/0935-1221/2005/0017-0905.

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Biyoune, Mohamed Ghali, Brahim Bouargane, Hicham Bari, Abdelkhalek Marrouche, Raddoine Bellajrou, Ali Atbir, Laarbi Boukbir und Said Mançour Billah. „Water quality depends on remineralization’s method in the desalination plant“. Mediterranean Journal of Chemistry 10, Nr. 2 (14.02.2020): 162–70. http://dx.doi.org/10.13171/mjc10202002141228mgb.

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Desalination of seawater is an alternative solution in arid zones to provide potable water. In south Morocco, the National Office of Electricity and Water (ONEE) has built many desalination factories. However, the osmosis water (permeate) is unbalanced and has a corrosive character. Therefore, a post-treatment of remineralization is necessary to return to water its calcio-carbonic equilibrium and to protect the distribution pipelines from corrosion degradation. Following the performance on limestone bed remineralization in Daoura plant in comparison with other methods, this article evaluates this technique, by checking the effect of parameters on water quality on the laboratory scale using a calcite bed pilot. We tested E.B.C.T (Empty Bed Contact Time), the upward speed, the bed length, the effect of water debit and the residence time on the treated water quality. Monitoring these parameters on the laboratory scale is indeed essential for optimal remineralization process. With the results of this study as well as economic consideration, it is possible to optimize the choice of the conditions needed for remineralization operation through limestone bed to minimize its costs with sizing and extrapolating to the industrial scale.

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Pekov, I. V., O. V. Petersen und A. V. Voloshin. „Calcio-ancylite-(Ce) from Ilímaussaq and Narssârssuk, Greenland, Kola peninsula and Polar Urals, Russia; ancylite-(Ce)-calcio-ancylite-(Ce) an isomorphous series“. Neues Jahrbuch für Mineralogie - Abhandlungen 171, Nr. 3 (15.05.1997): 309–22. http://dx.doi.org/10.1127/njma/171/1997/309.

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Mihajlovic, Slavica, Zivko Sekulic, Dusica Vucinic, Vladimir Jovanovic und Bozo Kolonja. „PVC mixtures’ mechanical properties with the addition of modified calcite as filler“. Chemical Industry 66, Nr. 5 (2012): 787–94. http://dx.doi.org/10.2298/hemind111115025m.

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In this study mechanical properties of PVC mixtures (PVC, stabilizer, lubricant, filler) such as tensile strength, tensile elongation, breaking strength, and breaking elongation were investigated. Unmodified calcite, as well as calcite modified by stearic acid, were used as fillers in wet and dry processes. The PVC mixtures containing the calcite modified by wet procedure have better mechanical properties compared to those with the calcite modified by the dry process. Tensile and breaking strength of the PVC mixture containing the calcite modified with 1.5% stearic acid using wet process, are higher for 2.8% and 5.2%, respectively, compared to the PVC mixture containing the calcite modified with the same amount of acid used in the dry process. The tensile strength difference between the mixtures increases with the increase of the concentration of used stearic acid up to 3%. The strength of PVC mixture with the calcite modified by wet process is 3.1% higher compared to the mixture containing calcite modified by dry process. The results showed that the bonding strength between calcite and the adsorbed organic component affected tensile strength, tensile elongation and breaking strength of the PVC mixtures. The best filler was obtained by wet modification using 1.5% stearic acid solution that provided the formation of a stearate monolayer chemisorbed on calcite. The PVC mixtures containing the calcite modified by wet process using 1.5% stearic acid solution exhibited the best mechanical properties. This calcite was completely hydrophobic with dominant chemically adsorbed surfactant, which means that stearate chemisorbed on calcite provided stronger interaction in the calcite-stearic acid-PVC system.

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Alutu, O. E., und M. O. Ihimekpen. „Utilization of Calcite and Calcite-Cement in the Stabilization of Laterites for Low-Cost Hollow Blocks“. Advanced Materials Research 18-19 (Juni 2007): 27–34. http://dx.doi.org/10.4028/www.scientific.net/amr.18-19.27.

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This paper examines the production of calcite and calcite-cement stabilized laterite hollow blocks as low-cost masonry units. First, is the production of laterite hollow blocks solely stabilized with finely ground limestone or calcite followed by the production of laterite hollow blocks stabilized with calcite-cement composite. Laterite was sourced from three locations: Asoro, Evbuotubu and Ugbowo. Blocks were produced using a specially constructed machine with percentages of calcite and calcite-cement content varying from 4% to 16% respectively at compactive pressures of 10.32 and 13.75N/mm2. Equal amounts of calcite and cement are used in the composite. The blocks were then tested for 7, 14 and 28 days strengths after curing. The results show that laterite blocks stabilized with calcite alone do not satisfy the Nigerian Industrial Standards or British Standards for blocks but those stabilized with 8% calcite-cement content, i.e., 4% calcite with 4% cement do, at moulding pressure of 13.7 N/mm2. Based on the local cost data, the results also show that calcite-cement stabilized laterite hollow blocks are 17% cheaper than an equivalent cement-stabilized hollow block and 46% cheaper than the low quality sandcrete blocks sold in the market.

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Saito, Ayaka, Hiroyuki Kagi, Shiho Marugata, Kazuki Komatsu, Daisuke Enomoto, Koji Maruyama und Jun Kawano. „Incorporation of Incompatible Strontium and Barium Ions into Calcite (CaCO3) through Amorphous Calcium Carbonate“. Minerals 10, Nr. 3 (17.03.2020): 270. http://dx.doi.org/10.3390/min10030270.

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Calcite is a ubiquitous mineral in nature. Heavy alkaline-earth elements with large ionic radii such as Sr2+ and Ba2+ are highly incompatible to calcite. Our previous study clarified that incompatible Sr2+ ions can be structurally incorporated into calcite through crystallization from amorphous calcium carbonate (ACC). In this study, we synthesized Sr-doped calcite with Sr/(Sr + Ca) up to 30.7 ± 0.6 mol% and Ba-doped calcite with Ba/(Ba + Ca) up to 68.6 ± 1.8 mol%. The obtained Ba-doped calcite samples with Ba concentration higher than Ca can be interpreted as Ca-containing barium carbonates with the calcite structure which have not existed so far because barium carbonate takes the aragonite structure. X-ray diffraction (XRD) patterns of the Sr-doped and Ba-doped calcite samples obtained at room temperature showed that reflection 113 gradually weakened with increasing Sr/(Sr + Ca) or Ba/(Ba + Ca) ratios. The reflection 113 disappeared at Ba/(Ba + Ca) higher than 26.8 ± 1.6 mol%. Extinction of reflection 113 was reported for pure calcite at temperatures higher than 1240 K, which was attributed to the rotational (dynamic) disorder of CO32− in calcite. Our Molecular Dynamics (MD) simulation on Ba-doped calcite clarified that the CO32− ions in Ba-doped calcites are in the static disorder at room temperature. The CO32− ions are notable tilted and displaced from the equilibrium position of pure calcite.

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Clare, Gerry, Polly Nyiri, Chie Yamamoto und Emma Preston. „The Calais ‘jungle’“. British Journal of General Practice 66, Nr. 651 (29.09.2016): 510.2–510. http://dx.doi.org/10.3399/bjgp16x687193.

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Morice, Alain. „Calais : stationnement interdit“. Vacarme 23, Nr. 2 (2003): 57. http://dx.doi.org/10.3917/vaca.023.0057.

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HALFORD, BETHANY. „CALCITE CLOSE-UP“. Chemical & Engineering News 87, Nr. 48 (30.11.2009): 7. http://dx.doi.org/10.1021/cen-v087n048.p007.

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Oñate Rosado, Hermes Luis, Anderson Correa und Francisco Flavio Costa Filho. „Signo del calcio“. Acta Médica Colombiana 43, Nr. 1 (15.03.2018): 50. http://dx.doi.org/10.36104/amc.2018.825.

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Paciente masculino de 85 años de edad, nacionalidad Japonesa, ingresa al servicio de urgencias del Hospital Dante Pazzanese de Cardiologia con cuadro clínico de 12 horas de evolución consistente en dolor torácico opresivo, inicio gradual, intensidad moderada, duración mayor de 30 minutos, no irradiado, no mejora con el reposo o con el uso de nitratos asociado a disnea de medianos esfuerzos, niega síntomas neurovegetativos. Antecedentes de importancia Hipertensión arterial, Enfermedad renal crónica estadio 4 (TFG 22 ml/min/1.73m2 por CKD EPI), Insuficiencia cardiaca con fracción de eyección reducida (FE 22%). Al examen físico paciente normotenso, bradicárdico, ausculta con soplo sistólico en foco Mitral grado 3/6, sin frémito; sin signos de bajo gasto cardiaco. Realizada impresión diagnostica de Síndrome coronario agudo por lo cual fue solicitado EKG de 12 derivaciones, marcadores de necrosis miocárdicas y Radiografía de tórax. El EKG revela bradicardia sinusal, hemibloqueo anterior izquierdo, sin signos de lesión o isquemia aguda, marcadores negativos y radiografía de tórax muestra ensanchamiento mediastinal y signo del calcio positivo por lo que sospechamos en Síndrome aórtico agudo y es solicitado Eco transesofágico mostrando dilatación discreta de la aorta ascendente 40 mm, arco aórtico de difícil visualización, dilatación moderada de la aorta descendente 44 mm, imagen sugestiva de hematoma intramural aórtico iniciando después del nacimiento de la arteria subclavia izquierda y extendiéndose hasta el tercio proximal de la aorta torácica descendente, midiendo 11 mm de espesor. El paciente posteriormente es sometido a Angiotomografia de tórax con medidas de prevención de nefrotoxicidad inducida por contraste y es evidenciado presencia de hematoma en la pared de la aórta torácica descendente que inicia después de la emergencia de la arteria subclavia izquierda hasta la emergencia de las arterias renales. Fue solicitada valoración por cirugía vascular y optado por tratamiento clínico dada la fase etaria del paciente y la presencia de comorbilidades. Actualmente continúa en seguimiento con Cardiologia, Nefrologia y Cirugía vascular.

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Fall, Cécilia. „Moving Beyond Calais“. Hommes & migrations, Nr. 1314 (01.04.2016): 120–23. http://dx.doi.org/10.4000/hommesmigrations.3649.

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Arvidson, Rolf S., Cornelius Fischer und Andreas Luttge. „Calcite Dissolution Kinetics“. Aquatic Geochemistry 21, Nr. 5 (23.06.2015): 415–22. http://dx.doi.org/10.1007/s10498-015-9268-9.

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Beaumont Caminos, C., C. Jean Louis und T. Cabada Giadas. „Signo del calcio“. Medicina Intensiva 33, Nr. 2 (März 2009): 103. http://dx.doi.org/10.1016/s0210-5691(09)70693-x.

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Wilkinson, Katie. „Volunteering in Calais“. Critical and Radical Social Work 4, Nr. 1 (14.03.2016): 117–20. http://dx.doi.org/10.1332/204986016x14525996137525.

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