The feasibility of the actual combat application of the traditional martial arts techniques in modem combat challenge

The traditional Chinese martial arts are the pride of the Chinese national specialties, but with the development of the western modem combat, some traditional martial arts bias appeared, such as the argument of the real fight of the traditional martial arts. This paper starts from the traditional historical origin, and analyzes the actual combat possibility of traditional martial arts to study the feasibility of the actual combat application of the traditional martial arts techniques in modem combat challenge.

Tropospheric Wet Refractivity Tomography Based on the BeiDou Satellite System

This paper presents a novel approach for assessing the precision of the wet refractivity field using BDS （BeiDou navigation satellite system） simulations only,GPS,and BDS＋GPS for the Shenzhen and Hongkong GNSS network.The simulations are carried out by adding artificial noise to a real observation dataset.Instead of using the δ and σ parameters computed from slant wet delay,as in previous studies,we employ the Bias and RMS parameters,computed from the tomography results of total voxels,in order to obtain a more direct and comprehensive evaluation of the precision of the refractivity field determination.The results show that：（1） the precision of tropospheric wet refractivity estimated using BDS alone （only 9 satellites used） is basically comparable to that of GPS; （2） BDS＋GPS （as of current operation） may not be able to significantly improve the data＇s spatial density for the application of refractivity tomography; and （3） any slight increase in the precision of refractivity tomography,particularly in the lower atmosphere,bears great significance for any applications dependent on the Chinese operational meteorological service.

Impact of COVID-19 pandemic on the pregnancy outcomes of women undergoing assisted reproductive techniques(ARTs):a systematic review and meta-analysis

The global outbreak of the coronavirus disease 2019(COVID-19) led to the suspension of most treatments with assisted reproductive technique(ART). However, with the recent successful control of the pandemic in China, there is an urgent public need to resume full reproductive care. To determine whether the COVID-19 pandemic had any adverse effects on female fertility and the pregnancy outcomes of women undergoing ART, a systematic review and meta-analysis was conducted using the electronic Chinese and English databases. Dichotomous outcomes were summarized as prevalence, and odds ratios(ORs)and continuous outcomes as standardized mean difference(SMD) with 95% confidence interval(CI). The risk of bias and subgroup analyses were assessed using Stata/SE 15.1 and R 4.1.2. The results showed that compared with women treated by ART in the pre-COVID-19 time frame, women undergoing ART after the COVID-19 pandemic exhibited no significant difference in the clinical pregnancy rate(OR 1.07, 95% CI 0.97 to 1.19;I^(2)=0.0%), miscarriage rate(OR 0.95, 95% CI 0.79 to1.14;I^(2)=38.4%), embryo cryopreservation rate(OR 2.90, 95% CI 0.17 to 48.13;I^(2)=85.4%), and oocyte cryopreservation rate(OR 0.30, 95% CI 0.03 to 3.65;I^(2)=81.6%). This review provided additional evidence for gynecologists to guide the management of women undergoing ART treatment during the COVID-19 pandemic timeframe.