نتایج جستجو برای: potassic composition
تعداد نتایج: 259977 فیلتر نتایج به سال:
در این پایان نامه عملگرهای ترکیبی و ضربی را که بوسیله نگاشتهای عملگر مقدار روی فضاهای بوخنر (لورنتس بوخنر و پایا بازارایشی بوخنر ) تولید می شوند را موردمطالعه قرار داده، بسته بودن برد، فشردگی و طیف آنها را بررسی می نماییم. در ضمن این پایان نامه براساس مرجع زیر تنظیم شده است. s. c. arora, g. datt and s. verma, multiplication and composition operators on lorentz-bochner spaces, osaka j. math. 4...
The black land is distributed in a narrow area from south to north in northeast of China Nine soil samples with high, middle and low fertility were collected in the field of south, north and middle area. These samples were analyzed in laboratory, and pot experiment was performed mainly in Harbin. The results showed that Black soil has high potential of providing potassium, the concentration of ...
Due to the increasing demand for conventional sources of potassium (K) and their inaccessibility by African countries, K-rich igneous rocks are increasingly studied as potential alternative sources. In this study, six potassic (syenites trachytes) from Tamazeght, Jbel Boho, Ait Saoun, El Glo’a regions (Morocco) were sampled characterized. Then they hydrothermally treated enhance K release use f...
In northwest of Marand northern part of Urumieh Dokhtar Magmatic Arc (UDMA) a set of volcanic rocks crop out with composition of andesite, dacite, and sodic, potassic and ultrapotassic alkaline basalts with Upper Miocene until Plio-Quaternary in age. This paper report the andesitic and dacitic lavas erupted within pyroclastic rocks. These rocks have porphyritic texture and consist of plagioclas...
Young mafic lavas from the East African Western Rift record melting of subcontinental lithospheric mantle that was metasomatically modified by multiple tectonic events. We report new isotope data monogenetic cinder cones near Bufumbira, Uganda, in Virunga Volcanic Field: 87Sr/86Sr = 0.7059–0.7079, εNd −6.5 to −1.3, εHf −6.3 +0.9, 208Pb/204Pb 40.1–40.7, 207Pb/204Pb 15.68–15.75, and 206Pb/204Pb 1...
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