Issn 2181-7200 Ўзбекистон республикаси олий ва ўрта

СОNTENTS 
Scientific-technical journal (STJ FerPI, ФарПИ ИТЖ, НТЖ ФерПИ, 2020, T.24, спец.вып. №1) 7 
FUNDAMENTAL SCIENCES 
Tolaboev D.H., Rakhmonov T.I., Yusupov F.T. State of current carriers and light absorption in 
semiconductor quantum wells ................................................................................................................... 
12 
MECHANICS 
Umarov A.A., Ortikova K.I., Kurbanov D., Sattarov N.M. Analysis of the speeds of a saw cylinder and 
a agitator in a linter machine ..................................................................................................................... 
18 
Fayzimatov Sh.N., Abdullayev B.I., Yusupov S.M. Investigation of the process of deformation of parts 
during the formation of symmetrical parts in the process of stamping ...................................................... 
21 
Khodjiev M.T, Isaev Sh.Sh, Oripov N.M. 
Theoretical study of cleaning cotton from contaminants 
under the action of a pile drum .................................................................................................................
24 
Yusupov A.A., Bobojonov X.R., Oripov J.I. The research changing physical and mechanical 
properties of yarn after finishing ............................................................................................................... 
31 
BUILDING 
Usmonov A.A., Usmanova N.A, Hudaykulov S.I., Nishonov F.Kh. 
Navigation tests of hydroturbine 
models of the Karkidon reservoir in a cavitation installation and instrumentation .................................
36 
ENERGETICS, THE ELECTRICAL ENGINEERING, ELECTRONIC DEVICES AND 
INFORMATION TECHNOLOGIES 
Kholiddinov I.Kh., Shaismatov S.E., Kholiddinova M.M. Algorithm for determining the level of 
voltage non-sinusoidality created by electrical installations ..................................................................... 
41 
Tursunov D.A., Ismoilov I.K. Research on the use of power transformer control devices ....................... 
46 
Ergashev S.F., Rustamov U.S., Abdurakhmonov S.M., Kuldashov O.H. Assessment of water resources 
of ferghana region and prospects for development of MICRO HYDROELECTRIC POWER 
STATIONS ................................................................................................................................................ 
55