The preliminary selection of motors for geared elevator hoist drives

2008 ◽  
Vol 79 (11) ◽  
pp. 631-635
Author(s):  
V. I. Afonin
2021 ◽  
Vol 7 (1) ◽  
pp. 615-630
Author(s):  
Vincenza Forgia ◽  
Robert H. Tykot ◽  
Andrea Vianello ◽  
Elena Natali

Abstract The paper presents the results obtained by techno-typological analysis of a lithic assemblage from the Neolithic layers of Grotta San Michele Arcangelo di Saracena (Cosenza) together with the results of micro-wear analysis obtained from a preliminary selection of obsidian artifacts with different provenances distinguished by pXRF analysis. The site provides one of the best preserved Neolithic sequences in the area, from the earliest Impressed Wares (or Impresse Arcaiche) (early sixth millennium BC) to the Spatarella pottery style (end fifth – early fourth millennium BC). Along the Neolithic sequence, it is possible to observe some major changes within lithic resources management. In particular, it is possible to notice some techno-typological breakages between the Early Neolithic and the further stages, until the second phase of the Late Neolithic, when another rupture, corresponding to the Spatarella facies, is evident.


Rhizosphere ◽  
2019 ◽  
Vol 10 ◽  
pp. 100144 ◽  
Author(s):  
Valéria Borges da Silva ◽  
Aleksandro Ferreira da Silva ◽  
Thaise Rosa da Silva ◽  
Jonnathan Whiny Moraes dos Santos ◽  
Jéssica Fernanda da Silva ◽  
...  

1992 ◽  
Vol 70 (7) ◽  
pp. 1997-2002 ◽  
Author(s):  
V. Kanazirev ◽  
T. Tsoncheva

An important characteristic of the methanol-to-hydrocarbons reaction is its autocatalytic behaviour under certain conditions. In this paper, self-acceleration in the conversion of MeOH over various zeolites, e.g., H-ZSM-5, H-CaY, H-offretite, and H-mordenite, in a flow reactor is examined. Self-acceleration is considered as a step of the nonstationary state changes taking place as a result of the interaction between the reaction medium and the catalyst. The effect on this process of factors such as partial pressure of methanol and the presence of hydrogen in the reaction mixture are investigated. Conclusions regarding the mechanism of C—C bond formation are considered. The course of the nonstationary process may be used for preliminary selection of catalysts for synthesis of hydrocarbons from methanol.


Fruits ◽  
2007 ◽  
Vol 62 (1) ◽  
pp. 27-34 ◽  
Author(s):  
Ítalo Herbert Lucena Cavalcante ◽  
Márkilla Zunete Beckmann ◽  
Antonio Baldo Geraldo Martins ◽  
Milton César Costa Campos

2001 ◽  
Vol 1 (1) ◽  
pp. 51-53
Author(s):  
Mansab A. Khokhar ◽  
M. Ashraf . ◽  
A. Fatah Soomro . ◽  
Shahzad Asad .

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