Technological Study on Tobaccos of Basmi Group Variety Grown in Different Regions of Bulgaria

2005 ◽  
Vol 19 (3) ◽  
pp. 202-207
Author(s):  
V. Nikolova ◽  
D. Drachev ◽  
N. Nikolov
2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Yan Liu ◽  
Rui Li ◽  
Junchang Yang ◽  
Ruiliang Liu ◽  
Guoxing Zhao ◽  
...  

AbstractTechnology employed by the ancient goldsmiths is traceable through archaeometallurgy. Using non-destructive analytical methods, namely, a 3D digital microscopy and a scanning electron microscopy with energy dispersive spectrometer (SEM–EDS), we investigated the manufacturing techniques and chemical composition of gold and silver artefacts recovered from Tomb 2 (M2), the richest find from Xigoupan cemetery (fourth-third century BCE) in the northern part of Jungar Banner, Inner Mongolia. The present research contributes to a better understanding of the inventive nature of precious metal working industry in early China (eighth-third century BCE). First, cultural interchange was evidenced in the metalwork examined, notably as being closely linked to techniques emerging from the Eurasian steppes. In Xigoupan M2, the ornamentation of sheet works in the Scytho-Siberian animal style was seen to be clearly influenced by the central Asian steppe goldsmithing practice, while certain cast items were typical of the Chinese tradition. Second, our analysis reveals that the gold appliqués with raised animal figures that were previously thought to be repoussé work have actually been made with double-sided carving. We consider such a new technology as one of local inventions that was inspired by methods arriving from the central Asian steppes. In addition, our analysis of elemental composition reveals that the gold artefacts found in Xigoupan M2 to be made of natural gold, while the horse harness ornament is made of pure silver. These results, combined with the study of the existing data pertaining to comparable examples, attest to the shared craftsmanship in prestige metal production across the northern Chinese states, especially with regard to the pre-imperial period Qin workshop.


Author(s):  
A. Yu. Ol'shanskii ◽  
A. Storozhev

AbstractA group variety defined by one semigroup law in two variables is constructed and it is proved that its free group is not a periodic extension of a locally soluble group.


Optik ◽  
2021 ◽  
Vol 247 ◽  
pp. 167923
Author(s):  
Hassena Mounir ◽  
Toufik Aliouane ◽  
Leila Kerdja

Author(s):  
Fedoruk O. ◽  
◽  
Fedoruk A. ◽  

The article is devoted to the publication ofmaterials of a technical and technological analysis of ceramics discovered on four nowadays non-existent settlements, founded during the Stolypin reforms, on the territory of the modern Tabunsky district of the Altai region. As a result of the study, it was found that ceramic products from clays of medium and strong ferrous content, of various plasticity prevailed there. Three recipes for molding materials have been founded. Most of the products were fired at high temperatures with oxygen access. Most of the crockery were not subjected to additional surface treatment; glazed items are also found, one vessel was ornamented. The data obtained agree with the available written and ethnographic sources. Further work on the technical and technological analysis of “Russian” ceramics, as well as conducting archaeological and ethnographic research, can provide more complete information about the level of development of pottery production in Altai, as well as reveal the specifics and local features of different districts. Keywords: pottery, ceramics, first half of the 20th century, altai, technical and technological analysis


2013 ◽  
Vol 405-408 ◽  
pp. 1725-1732 ◽  
Author(s):  
Guo Qi Tang ◽  
Dong Wei Cao ◽  
Ke Zhong ◽  
Xiao Qiang Yang

The interlayer bonding of double-layer porous asphalt pavement will show more variations with different construction technologies, such as one-step molding by double-layer (hot on hot) paver, or paving layer by layer (hot on cold) with or without tack coat, and the variations will definitely have influences on pavement structure. Different interlayer technologies are studied in this paper on three levels including simulation experiments on specimen by indoor preparation, calculation of pavement mechanics, and construction of testing road, so that optimal interlayer bonding technology for double-layer porous asphalt pavement is discussed in combination with its effect on permeability.


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