Search

Your search keyword '"Li, Wenya"' showing total 1,369 results
Start Over Author "Li, Wenya"
1,369 results on '"Li, Wenya"'

1. Analysis of the background signal in Tianwen-1 MINPA

Author

Wang, Ziyang, Miao, Bin, Wang, Yuming, Shen, Chenglong, Kong, Linggao, Li, Wenya, Tang, Binbin, Ma, Jijie, Qiao, Fuhao, Wang, Limin, Zhang, Aibing, and Li, Lei

Subjects
Physics - Space Physics
Abstract

Since November 2021, Tianwen-1 started its scientific instrument Mars Ion and Neutral Particle Analyzer (MINPA) to detect the particles in the Martian space. To evaluate the reliability of the plasma parameters from the MINPA measurements, in this study, we analyze and reduce the background signal (or noise) appearing in the MINPA data, and then calculate the plasma moments based on the noise-reduced data. It is found that the velocity from MINPA is highly correlated with that from the Solar Wind Ion Analyzer (SWIA) onboard the MAVEN spacecraft, indicating good reliability, and the temperature is also correlated with the SWIA data, although it is underestimated and has more scatter. However, due to the limited $2\pi$ field of view (FOV), it's impossible for MINPA to observe the ions in all directions, which makes the number density and the thermal pressure highly underestimated compared to the SWIA data. For these moments, a more complicated procedure that fully takes into account the limited FOV is required to obtain their reliable values. In addition, we perform a detailed analysis of the noise source and find that the noise comes from the electronic noise in the circuits of MINPA. Based on this study, we may conclude that MINPA is in normal operating condition and could provide reliable plasma parameters by taking some further procedures. The analysis of the noise source can also provide a reference for future instrument design., Comment: 15 pages, 11 figures

Published
2024

19. Observations of rapidly growing whistler waves in front of space plasma shock

Author

He, Jiansen, Zhu, Xingyu, Luo, Qiaowen, Hou, Chuanpeng, Verscharen, Daniel, Duan, Die, Li, Wenya, Zhao, Jinsong, Graham, Daniel, Zong, Qiugang, and Yao, Zhonghua

Subjects
Physics - Space Physics, Astrophysics - Earth and Planetary Astrophysics, Physics - Plasma Physics
Abstract

Whistler mode wave is a fundamental perturbation of electromagnetic fields and plasmas in various environments including planetary space, laboratory and astrophysics. The origin and evolution of the waves are a long-standing question due to the limited instrumental capability in resolving highly variable plasma and electromagnetic fields. Here, we analyse data with the high time resolution from the multi-scale magnetospheric spacecraft in the weak magnetic environment (i.e., foreshock) enabling a relatively long gyro-period of whistler mode wave. Moreover, we develop a novel approach to separate the three-dimensional fluctuating electron velocity distributions from their background, and have successfully captured the coherent resonance between electrons and electromagnetic fields at high frequency, providing the resultant growth rate of unstable whistler waves. Regarding the energy origin for the waves, the ion distributions are found to also play crucial roles in determining the eigenmode disturbances of fields and electrons. The quantification of wave growth rate can significantly advance the understandings of the wave evolution and the energy conversion with particles.

Published
2021

34. Effect of post-weld heat treatment on microstructure and mechanical properties of linear friction welded TC11 titanium alloy joints

Author

WANG Xuyang, LI Ju, TAO Jun, JIN Junlong, and LI Wenya

Subjects
tc11 titanium alloy, linear friction welding, post-weld heat treatment, microstructure, mechanical property, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

Post-weld heat treatment(PWHT) could improve the microstructure and properties of linear friction welded joints. The linear friction welded joints of TC11 titanium alloy were double annealed at 950 ℃ and 530 ℃. The effect of double annealing on the microstructure of the joints was studied by microscopic analysis techniques such as optical microscopy(OM) and scanning electron microscopy(SEM). The results show that the dynamic recrystallization grains in the weld zone(WZ) completely disappear after PWHT, and are replaced by coarse needle, strip, and spherical α-phase grains; the degree of deformation of the thermos-mechanically affected zone(TMAZ) decreases. The grains grow, and some α structures are spheroidized. The secondary α phase in the base metal(BM) grows up in the shape of coarse needle and short rod. The grain orientation of the WZ and the TMAZ is more random after heat treatment, and the preferred orientation is significantly reduced. The mechanical properties tests indicate that the double annealing treatment after welding eliminates the high hardness zone in the center of the joint, and the center hardness is about 50HV lower than that of the as-welded joint. The hardness of TMAZ is about 30HV higher than that of the as-welded joint. No significant decrease in tensile strength presents after PWHT. The impact toughness of the joint reaches 61.3 J·cm-2 after PWHT, about 80% higher than that of the as-welded joint and close to that of the BM.

Published
2023
Full Text
View/download PDF

50. Progress of research on Traditional Chinese Medicine characteristic nursing of patients with cognitive impairment after stroke (脑卒中后认知障碍的中医特色护理研究进展)

Author

LI Wenya (李文雅), XIAO Chun (肖纯), HUANG Lu (黄璐), and PENG Xiaoling (彭晓玲)

Subjects
post-stroke cognitive impairment, traditional chinese medicine characteristic nursing, moxibustion, auricular acupoint pressing, extended care, 脑卒中后认知障碍, 中医特色护理, 艾灸, 耳穴压豆, 延续护理, Nursing, RT1-120
Abstract

This paper expounds the concepts of Traditional Chinese Medicine (TCM) characteristic nursing and post-stroke cognitive impairment, analyzes the etiology and pathogenesis of post-stroke cognitive impairment, reviews the application status of TCM characteristic nursing in the care of patients with post-stroke cognitive impairment, studies its application, looks forward to its development trend, and provides a broader perspective for the clinical care of PSCI patients. (本文阐述中医特色护理及脑卒中后认知障碍相关概念, 分析脑卒中后认知障碍病因病机, 综述中医特色护理在脑卒中后认知障碍患者护理中的应用现状, 展望其发展趋势, 旨在为PSCI患者的临床护理提供参考。)

Published
2023
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results