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This paper discusses
the biostratigraphy and palaeoecology of calcareous
nannofossils of the uppermost Mozduran Formation in the Jozak section in west Kopet-Dagh
basin. The Mozduran Formation consists of white to grey
Limestone. In the studied sections, samples are taken and prepared with smear slides. In the Jozak section, 17 species have been determined.
Based on nannoplanktons and as a result of biostratigraphy studies, the nannofossil
standard zones (CC4) are identified. According to this zone, the age of the studied thickness
is Early Hauterivian in
this section in west Kopet-Dagh basin. The presence of warm water indicators (Nannoconus, Watznaueria, Lithraphidites)
suggests warm surface water conditions in the studied thickness.
In the Jozak section based on Nannoconus spp.,
The biostratigraphy of calcareous nannofossils of the Cretaceous is investigated in the boundary between Abderaz and Kalat Formations
through the record of species richness, diversity and distribution patterns in
the west Kopet-Dagh region. The Kalat Formation comprising
of coarse-grained detritus limestone with subordinate sandstone intercalations
and the Abderaz Formation mainly consists of limestone, Shale and Limy marl.
Nannofossils of this boundary in each of studied sections are listed and figured. 21 species in Ghalehzoo section, 29
species in Sheikh section and 19
species in Jozak section have been determined. Boistratigraphy based on calcareous nannofossil allow the
identification of nannofossil standard zones CC21 and CC26 in all of sections,
According to these zones in all of sections, the age of the studied thickness
is Early Late Campanian-Late
Late Maastrichtian in these sections.
Studying of operation balance in single-phase induction motors is an issue of interest due to the need for reducing the power consumption and increasing the motors’ life. The paper focuses on improving the motor performance by balancing the stator phase operation for the most common-used connection diagrams of single-phase capacitor-run induction motors (SPCRIMs) and three-phase induction motors (TPIMs) operating from single-phase supply (SPS). Therefore, a mathematical model is used to balance the motor operation by varying the frequency supply voltage. Characteristics of balancing parameters are investigated, various methods of motor balancing are presented and comparisons were done among these balancing methods.