منابع مشابه
Hydrothermal growth of quartz crystals in industry. Present status and evolution
Review of technical and economic problems enCOUntered in industry. Improvements that need to be brought, both at process and equipment levels with the help of scientific laboratories. Applications concerning piezoelectric materials. This paper is divided in four parts : 1 PROCESS' HISTORICAL DEVELOPMENT AND PRESENT STATUS' OUTLINES 2 MAIN DIFFICULTIES ENCOUNTERED IN HYDROTHERMAL SYNTHESIS 3 PRE...
متن کاملan investigation about the relationship between insurance lines and economic growth; the case study of iran
مطالعات قبلی بازار بیمه را به صورت کلی در نظر می گرفتند اما در این مطالعه صنعت بیمه به عنوان متغیر مستفل به بیمه های زندگی و غیر زندگی شکسته شده و هم چنین بیمه های زندگی به رشته های مختلف بیمه ای که در بازار بیمه ایران سهم قابل توجهی دارند تقسیم میشود. با استفاده از روشهای اقتصاد سنجی داده های برای دوره های 48-89 از مراکز ملی داده جمع آوری شد سپس با تخمین مدل خود بازگشتی برداری همراه با تعدادی ...
15 صفحه اولHydrothermal synthesis of monodisperse single-crystalline alpha-quartz nanospheres.
Uniformly-sized, single-crystal alpha-quartz nanospheres have been synthesized at 200 °C and 15 atm under continuous stirring starting from uniform, amorphous Stöber silica colloids and using NaCl and alkali hydroxide as mineralizers. Quartz nanosphere size is controlled by the colloid particle size via direct devitrification. Uniform, high-purity nanocrystalline quartz is important for underst...
متن کاملCrystallographic preferred orientations analysis of quartz crystals in Psammite using electron backscatter diffraction,western Ireland
The present study investigates the crystal preferred orientation (CPO) of quartz crystals in psammitic rocks to ascertain the deformationmechanism using electron backscatter diffraction (EBSD) on quartz crystals from north of the Renvyle-Bofin Slide (RBS) nearLetterfrack in western Ireland. Complete crystallographic orientations were determined for several thousand individual quartz crystalsin ...
متن کاملEffects of hydrothermal treatment on the properties of nanoapatite crystals
We report the synthesis of nanoapatite crystals via a hydrothermal reaction of hydroxyapatite precipitates. The impact of the reaction conditions on the properties of the crystals obtained were evaluated. The hydrothermal reaction that takes place markedly affected the crystallinity, morphology, and size of the nanoapatite crystals formed. High crystallinity and large crystal size were obtained...
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ژورنال
عنوان ژورنال: Journal of the Mineralogical Society of Japan
سال: 1981
ISSN: 1883-7018,0454-1146
DOI: 10.2465/gkk1952.15.18