Mathematical modeling of the technological process of operation and parameters of the device for formation of longitudinal rollers (pawls) between cotton rows

This article reveals the features of mathematical modeling of the technological process of work and the parameters of the device for the formation of longitudinal pawls between cotton rows. And also, the results of the STUDY are presented, and the following main conclusions were made: the task of mechanizing the formation of longitudinal legs can be solved by lifting the soil from the two side furrows and throwing it into the central furrow using a palletizing device with active working organs. Studies have shown that for the qualitative formation of longitudinal dogs between rows of cotton, it is advisable to use a device with a single-pass continuous auger. To avoid damage to cotton seedlings, to ensure the required productivity with minimal energy consumption, the screw device must have the following parameters: the screw diameter is 400 mm, the inner and outer diameters of the screw pipe 420 and 426 mm; respectively, the pitch of the screw is 320 mm; the rotation speed of not less than 325 rpm; and the mounting angle relative to horizontal-not more than 35 °; the entry angle into the ground shield located in front of the screw tube, the device needs to be within 24-25º.

Electronic controlled CMOS inductor with patterned metal ground shields for fine inductance tuning application

This paper is on an inductance fine tuning technique which benefits from the idea of varying the number of metal plates of an inductor’s pattern ground shield (PGS) shorted to ground to change its magnetic fields. This technique is unique because the geometry and physical shape of the inductor remains untouched from its form in the process design kit (PDK) while the inductance is being tuned. The number of metal shields shorted to ground was controlled by an electronic circuit which consists of analog-to-digital converters and active switches. Both Sonnet EM simulator and Cadence Virtuoso were used for the inductor and circuit simulations. From the simulation, it was found that the inductance increased while the Q-factor decreased as more metal shields were shorted to ground. For instance, at 1.6 GHz, the simulated inductance was 8.8 nH when all metals were floated and 9.4 nH when all metals were shorted to ground. On the other hand, the simulated Q-factor was 10.4 when all metals were floated and 9.8 when all metals were shorted to ground. From both simulation and measured results, both inductance and inductance tuning range increased with frequency. From the measured results too, the inductance observed was 9.4 nH at 1.6 GHz, 10.8 nH at 2 GHz, and 13.5 nH at 2.5 GHz when all the metal shields were shorted to ground. The inductance tuning range was 6.2% at 1.6 GHz, 12.5% at 2 GHz, and 20% at 2.5 GHz. The measured results showed good correlation with the simulated results trend, but with smaller value of inductance, inductance tuning range and Q-factor.

DESIGN FEATURES OF THE MIXED GROUND SHIELD TUNNEL BORING MACHINES

The features of the selection and calculation of the main elements of the shield machine with the ground-cutting head and the type of its support are considered. The requirements for the bottom-hole chamber and its elements, the system of stabilization of the face of the shield machine and equipment for injection of additives are described. It considers the issues of design of mixing devices and systems for removal of soil.