نتایج جستجو برای: agate
تعداد نتایج: 176 فیلتر نتایج به سال:
Although hydrously altered, CR chondrites are among the most primitive samples of the solar nebula because of no evidence for thermal or shock metamorphism [1], high presolar grain abundances [2], and perhaps because of their solar refrac-tory lithophile/Mg ratios [3]. Previous O-isotope measurements showed that CR chondrites form a mixing line of slope ~ 0.7 with a rather large scatter [4]. We...
Introduction: Melilite, a solid solution of åker-manite (Ca 2 MgSi 2 O 7) and gehlenite (Ca 2 Al 2 SiO 7), is one of the major constituents of the Ca-Al-rich inclusions (CAIs), representing the oldest material of the solar system. Therefore, knowledge of the phase and compositional relationships in the åkermanite-gehlenite binary system is very important for understanding the formation and evol...
BACKGROUND The impact of increased energy resolution of cadmium-zinc-telluride (CZT) cameras on the assessment of left ventricular function under dual-isotope conditions (99mTc and 123I) remains unknown. The Amsterdam-gated dynamic cardiac phantom (AGATE, Vanderwilt techniques, Boxtel, The Netherlands) was successively filled with a solution of 123I alone, 99mTc alone, and a mixture of 123I and...
Jewelry comes in a wide variety of shapes and sizes. The purpose of using jewelry, decoration and the beauty of appearance or beliefs enumerate. Men’s rings in Iran are among the ornaments that, in addition to beauty, convey a kind of thought and character. Ring making is one of the original Iranian arts with a long history and varied uses. Ring is sometimes a stamp, a commandment message or on...
Introduction: We report Modified gaussian model (MGM) deconvolution analyses [2] of reflectance spectrum of the Yamato (Y) 981031. Petrological characteristics of Y981031 had already reported [1]. Absorption features derived from the MGM deconvo-lution are compared with the petrological characteristics of Y981031, and implication of the absorption features are discussed. Finally, we propose sou...
The nakhlites experienced a fluid alteration event on Mars leading to the rapid crystallization at low temperature (e.g. 25-150C) of siderite, clay and other salts in fractures within olivine and interstitial sites [1-2]. In order to help constrain the origin and evolution of the brine we present new Li-isotopic, C and Thermal Gas Analysis data for Nakhla and Lafayette samples. Techniques: Whol...
Introduction: Peak broadening recognized in X-ray diffraction (XRD) and micro-Raman (MRS) spectra of experimentally and naturally shock-metamorphosed carbonates from carbonate-target bo-lide impact structures has been shown to be a reliable indicator of impact-related shock-metamorphism [1-7]. However, studies have not yet shown whether this peak broadening is unique to or diagnostic of all car...
Introduction: Impact melt breccias from Apollo 16 and 17 show subtle but resolvable differences in trace element composition between the two sites, possibly indicating regional heterogeneity in the KREEP component contributing to these breccias. The compositional differences are most apparent in the high-field strength elements (HFSE; e.g., Zr, Hf, Nb, Ta), which are fractionated in KREEP relat...
INTRODUCTION Severe trauma represents the leading cause of mortality worldwide. While 80% of deaths occur within the first 24 hours after trauma, 20% occur later and are mainly due to healthcare-associated infections, including ventilator-associated pneumonia (VAP). Preventing underinflation of the tracheal cuff is recommended to reduce microaspiration, which plays a major role in the pathogene...
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