Multi-channel DMA Based Design of Voltage Monitoring Using Synchronous Frequency Trace-Sampling Technique

In order to eliminate the influence of frequency change on real-time voltage acquisition,a low-cost solution of voltage monitoring was proposed using the multi-channel DMA synchronous frequency trace-sampling technique.In-chip resources of the designed voltage monitor were fully utilized in hardware design to reduce external devices.The MQX RTOS was used to perform the functional tasks flexibly and efficiently;especially the Ethernet communication applications and USB device connection were realized using its TCP/IP protocol stack and USB driver.In addition,to ensure the safety of electrical records,data statistics and alarm information management were also implemented through the management of the storage in FLASH.The test results show that the voltage monitor designed in this paper has the advantages of accurate measurement,strong resistance to frequency interference and low cost,and can be widely applied in the field of voltage monitoring in distribution networks.

A cooling wound dressing for accelerating healing under sunlight

Wound healing is greatly influenced by the local skin environment,encompassing factors such as temperature and cleanliness.Nevertheless,the inadequate thermal regulation exhibited by traditional wound dressings can significantly impede the healing process,particularly when they are exposed to the intense heat of sunlight.In recent years,however,researchers have developed a groundbreaking daytime radiative cooling(DRC)dressing that is specifically designed to prevent wound overheating in hot outdoor environments.This innovative dressing creates an optimal wound microenvironment,effectively reducing inflammation and subsequently accelerating the healing process.It represents a significant leap forward in mitigating the deleterious effects of sunlight on wound healing,thus propelling the progress and enhancement of biomedical solutions for extreme environments conditions.

Crystallographic texture evolution and martensite transformation in the strain hardening process of a ferrite-based low density steel

The strain-induced martensite transformation is of great importance in the strain hardening process of ferrite based low-density steel.Based on the microstructure analysis,the texture evolution and martensite transformation behavior in the strain hardening process were studied.The results show that martensite transformation accompanied by TWIP effect and high density dislocations maintains the continuous hardening stage.As the strain increases,the texture of retained austenite evolves towards the F orientation{111}<112>,which is not conducive to martensite transformation.After the strain of 5%,the number of austenite grains with high Schmid factor orientations is gradually increased,and then significantly reduced when the strain is over 10%due to the occurrence of martensitic transformation,which results in a high martensitic transformation rate.However,the unfavorable orientation and the reduced grain size of austenite slow down the martensite transformation at the final hardening stage.Moreover,because of the coordination deformation of austenite grains,strain preferentially spreads between adjacent austenite grains.Consequently,the martensite transformation rate in strain hardening process is dependent on the orientation and grain size evolution of austenite,leading to a differential contribution to each strain hardening stage.