Zobrazeno 1 - 10
of 37
pro vyhledávání: '"Tsveta Stanimirova"'
Publikováno v:
Catalysts, Vol 14, Iss 7, p 445 (2024)
Acid–base M2+MgAlO and M2+AlO mixed oxides (where M2+ = Mg, Cu, Co, Zn, and Ni) were obtained by thermal decomposition of the corresponding layered double hydroxide (LDH) precursors and used as catalysts for cyclohexanol and benzaldehyde condensati
Externí odkaz:
https://doaj.org/article/feaf891babb046eda3db9c43c32754f8
Publikováno v:
Crystals, Vol 14, Iss 2, p 183 (2024)
A theoretical model of the crystal structure of the newly obtained compound Zn4(OH)6SO4·2–2.25H2O based on the compilation of the crystal–chemical properties of two known zinc-hydroxy-sulfate phases—mineral namuwite and hemihydrate—is propos
Externí odkaz:
https://doaj.org/article/9d506f487e83437f924dc7ea007f5ead
Publikováno v:
Българско е-Списание за Археология, Vol 11, Iss 1 (2021)
The analyzed pottery artefacts derive from vessels from ritual structures and from urns from a necropolis located near the village of Dubene, Karlovo Minicipality. The ritual structures are dated to the Early Bronze Age (EBA) III, while the cemetery
Externí odkaz:
https://doaj.org/article/ce1c360098a144068dcbab4bd92444b9
Publikováno v:
Българско е-Списание за Археология, Vol 6, Iss 1, Pp 91-108 (2016)
Site 5 is located at 500 m to the south of the village of Dravovishtitsa, Konstinbrod municipality (fig. 1). Rescue archaeological excavations conducted at the site in 2014 and 2015 identified cultural layers from several periods: Early Medieval, Lat
Externí odkaz:
https://doaj.org/article/acf33e2371c84d61967f6326020561ce
Publikováno v:
Eurasian Journal of Soil Science, Vol 4, Iss 2, Pp 100-106 (2015)
The present study aims to compare mineralogical composition of red soils, formed on marbles in South Bulgaria. We used mineralogical analysis of heavy and light mineral fraction in immersion under polarizing microscope and X-ray diffraction analysis
Externí odkaz:
https://doaj.org/article/5bf1610538a14239a6e147f05de1516a
Publikováno v:
Review of the Bulgarian Geological Society. 84:3-9
Quartz, calcite, feldspars, kaolinite, mica (biotite or sericite), and chlorite were determined as predominant minerals. Dolomite, amphibole, and johansenite are presented in smaller quantities. Epidote, hypogene hematite, rarely silver nugget, garne
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::97cf94e4c4a690d64aa0f8a7f7a7825f
https://doi.org/10.52215/rev.bgs.2023.84.1.3
https://doi.org/10.52215/rev.bgs.2023.84.1.3
Publikováno v:
Review of the Bulgarian Geological Society. 83:35-38
Osakaite, a new mineral for Bulgaria, was discovered in stalactites from the Gyudyurska mine, South Petrovitsa deposit, South Rhodope. The chemical composition determines isomorphous inclusion of Cu2+ and composition (Zn3Cu)(OH)6(SO4)•5H2O. The min
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::31e982c49f770c7ad9d2a6b562b4741b
https://doi.org/10.52215/rev.bgs.2022.83.3.35
https://doi.org/10.52215/rev.bgs.2022.83.3.35
Publikováno v:
Review of the Bulgarian Geological Society. 83:51-61
Experiments with dropwise alkalization of a 0.1 M ZnSO4 solution with 1M NaOH were carried out to establish the formation order of Zn-hydroxy-sulfate minerals (osakaite, namuwite, and lahnsteinite). During the controlled alkalization with 1M NaOH of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d379c3f7bc57284bb450faf4d9bc09bc
https://doi.org/10.52215/rev.bgs.2022.83.2.51
https://doi.org/10.52215/rev.bgs.2022.83.2.51
Autor:
Rositsa P. Nikolova, Nadia L. Petrova, Zlatka G. Delcheva, Liliya V. Tsvetanova, Tsveta Stanimirova, Iskra Piroeva
Publikováno v:
Mineralogy and Petrology. 117:27-38
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b83e598a4a5da1852bd225806627d19d
https://doi.org/10.1007/s00710-022-00797-9
https://doi.org/10.1007/s00710-022-00797-9
Autor:
Tsveta Stanimirova, Georgi Kirov
Publikováno v:
Review of the Bulgarian Geological Society. 82:28-30
The existence of a specific gallery type of zeolite framework is confirmed. It has been found that similar to HEU-type, STI-type framework can be represented as a layered structure in which two impermeable to water molecules and exchange cations alum
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::26e47db08cb7435d757d75bc889fc9ae
https://doi.org/10.52215/rev.bgs.2021.82.3.28
https://doi.org/10.52215/rev.bgs.2021.82.3.28