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In this paper we introduce an approach to increase density of field-effect transistors framework a downconversion mixer circuit. Framework the approach we consider manufacturing the inverter in heterostructure with specific configuration. Several required areas of the heterostructure should be doped by diffusion or ion implantation. After that dopant and radiation defects should by annealed framework optimized scheme. We also consider an approach to decrease value of mismatch-induced stress in the considered heterostructure. We introduce an analytical approach to analyze mass and heat transport in heterostructures during manufacturing of integrated circuits with account mismatch-induced stress.

Keywords: downconversion mixer circuit, optimization of manufacturing, increasing of element integration rate.

Deterministic end-to-end delay guarantees are meaningful for real-time applications. Under the assumption that the hop-count from source node to destination node of each session is limited, if the worst case waiting delay in nodes can be guaranteed, the bounds of worst case end-to-end delay of sessions are deterministic.We propose a joint congestion control, routing and scheduling algorithm which can provides deterministic bounds of waiting delay of packets in queues. This scheme can adjust transmission rates and drop packets according to the status of the average end-to-end delay of sessions that are reflected through a virtual queue. This virtual queue can also strengthen constraints on the average end-to-end delay of sessions. Theoretical proof indicates that the scheme can guarantee bounded worst case waiting delay of packets in nodes. To reduce the computational complexity, a distributed routing and scheduling scheme is designed.Rigorous theoretical analyses indicate that the utility optimality and network stability can be maintained under the proposed scheme. Simulation results show that, compared with existing schemes, this proposed scheme can improve QoS performances on throughput and average end-to-end delay.

Keywords: delay guarantees; lyapunov optimization; multihop wireless networks; crosslayer control.

Although the increase in frequency improves the transmission efficiency of medium-frequency transformer (MFT), the heating problems of MFTs are more serious than conventional power transformers due to the increase in core losses and winding losses.Insulation performance and volume are important factors to be considered when designing heat dissipation structures. After testing the insulation properties of gas-solid insulation system at 1~20 kHz, the minimum internal insulation size of the resin-cast MFT wasproposed to avoid breakdown or flashoverfailures during the expected operating life.Subsequently, a natural air-cooled heat dissipation structurewasdesigned for the MFT model based on the accurate calculation of core losses, winding losses and surface heat transfer coefficients.Finally, the forced air-cooling heat dissipation method was studied to meet the application of smaller volume MFTs on the basis of ensuring the high-frequency insulation performance. The results show that, it’s important to design the rational insulation the breakdown and flashover voltages of gas-solid insulating system are noticeable affected by frequency. The natural air-cooling method with heat sink fins on the upper and lower sides can limit the temperature rise of MFT to the allowable range for a 200 kVA, 10kHz MFT, while the forced air-cooling method with the air velocity of 1.6 m/s needs to be used if a smaller volume is required.

Index Terms: Medium-frequency transformer (MFT), heat dissipation, insulation properties, optimal design, gas-solid system.

We introduce an analytical approach to model manufacturing of an enhanced swing differential Colpitts oscillator to optimize this process for increasing of density of field-effect heterotransistors framework the considered circuit with decreasing of their dimensions. The approach gives a possibility to take into account spatial and at the same time temporal variations of parameters of technological process. At the same time the approach gives a possibility to take into account nonlinearity of physical processes. The approach gives a possibility to formulate recommendations for optimization of technological processes.

Keywords: analytical approach for modelling, enhanced swing differential Colpitts oscillator, optimization of manufacturing, increasing of density of elements.

In this paper we introduce an approach to increase integration rate of elements of a injection locked oscillator. Framework the approach we consider a heterostructure with special configuration. Several specific areas of the heterostructure should be doped by diffusion or ion implantation. Annealing of dopant and/or radiation defects should be optimized. An analytical approach for modelling of technological process has been also introduced. The approach gives a possibility to analyze mass and heat transport in multilayer structures without crosslinking of solutions on interfaces between layers. The approach also gives a possibility to take into account spatial and temporal variation of parameters of considered processes. Based on this approach we analyzed manufacturing an integrated circuit to increase density of elements.

Keywords: injection locked oscillator; optimization of manufacturing; heterostructure with special configuration; analytical approach for modelling.

The maximum temperature in Hebei Province was unusually high for a week on March 17-23, 2020. We select the maximum temperature data of 6 representative stations in Hebei Province and NCEP / NCAR reanalysis data to analyze the cause of formation. The results show that: the polar vortex is stronger and more easterly than usual and there is no ridge to guide the cold air southward near the Ural Mountains. The East Asian trough is relatively weak in strength and east in location, resulting in a weak influence of cold air on Hebei Province. Hebei Province is located in the center of the maximum positive anomaly of the temperature field at 850hPa. The positive anomaly of 850hPa zonal wind, the strong foehn effect and the weak meridional wind make the influence of cold air weaker than usual. The sea-level mean wind patterns are different from the average years, indicating that they are less affected by the moist and cold air from the Bohai Sea, which is conducive to rising temperatures.

Keywords: Spring 2020, Maximum temperature anomaly, Cause, Hebei Province