نتایج جستجو برای: silicates
تعداد نتایج: 5604 فیلتر نتایج به سال:
A topological index is a numerical value that describes the entire structure of chemical compound’s molecular graph and aids in understanding its physical properties, reactivities, boiling activities. In theory, these indices are instrumental quantifying various properties compounds such as SiO4. The selection SiO4 this work an important aspect because structural flexibility, easy availability,...
The oldest remnants of life on Earth from various localities in the Isua supracrustal belt Greenland date back to >3.7 billion years ago (Ga). They are form graphite, whose biogenicity is controversial. Previous studies used presence and isotopic composition nitrogen graphite along argue both for against biogenicity. To determine if chemistry can indeed serve as a biosignature, we investigated ...
The garnet calc-silicates at Baba-Nazar are located in the NE of Takab, Sanandaj- Sirjan zone. Anhedral to euhedral green colored garnets is a characteristic feature of these Calc-silicates. Mineral chemistry shows that garnets are Andradite- Grossular and contain more than 13% uvarovite. The high chromium content garnet, Cr-Spinel that have relatively Cr rich core than the rim, sulfide opaque ...
Abstract Tricalcium oxy silicate (C 3 S) and dicalcium 2 are the major constituents of cement. In this study, reactivity polymorphs calcium silicates is quantitatively investigated using Density Functional Theory. The result combining DFT calculation Bader charge analysis elucidates that main difference in between C S presence ions which has smaller partial compared to other oxygen crystals. Fo...
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