Shear wave splitting analysis of local earthquakes from dense arrays in Shimian,Sichuan

The Shimian area of Sichuan sits at the junction of the Bayan Har block.Sichuan-Yunnan rhombic block,and Yangtze block,where several faults intersect.This region features intense tectonic activity and frequent earthquakes.In this study,we used local seismic waveform data recorded using dense arrays deployed in the Shimian area to obtain the shear wave splitting parameters at 55 seismic stations and thereby determine the crustal anisotropic characteristics of the region.We then analyzed the crustal stress pattern and tectonic setting and explored their relationship in the study area.Although some stations returned a polarization direction of NNW-SSE.a dominant polarization direction of NW-SE was obtained for the fast shear wave at most seismic stations in the study area.The polarization directions of the fast shear wave were highly consistent throughout the study-area.This orientation was in accordance with the direction of the regional principal compressive stress and parallel to the trend of the Xianshuihe and Daliangshan faults.The distribution of crustal anisotropy in this area was affected by the regional tectonic stress field and the fault structures.The mean delay time between fast and slow shear waves was 3.83 ms/km.slightly greater than the values obtained in other regions of Sichuan.This indicates that the crustal media in our study area had a high anisotropic strength and also reveals the influence of tectonic complexity resulting from the intersection of multiple faults on the strength of seismic anisotropy.

Gravitational wave radiation from a double white dwarf system inside our galaxy: a potential method for seeking strange dwarfs

Like the investigation of double white dwarf （DWD） systems, strange dwarf （SD） - white dwarf （WD） system evolution in Laser Interferometer Space Antenna （LISA）＇s absolute amplitude-frequency diagram is investigated. Since there is a strange quark core inside an SD, SDs＇ radii are significantly smaller than the value predicted by the standard WD model, which may strongly affect the gravitational wave （GW） signal in the mass-transferring phases of binary systems. We study how an SD-WD binary evolves across LISA＇s absolute amplitude-frequency diagram. In principle, we provide an executable way to detect SDs in the Galaxy＇s DWD systems by radically new windows offered by GW detectors.

Effect of electroacupuncture on knee osteoarthritis and relevant inflammatory factors:A randomized clinical trial

Objective:To explore the treatment effects of electroacupuncture(EA),acupuncture with filiform needle,and western medication for knee osteoarthritis(KOA).Methods:It was a randomized,controlled trial with the blinding of outcome assessors and statistician.90 outpatients were diagnosed as KOA in Department of Acupuncture and Moxibustion,the First Affiliated Hospital of Heilongjiang University of Traditional Chinese Medicine.Using the random number table,they were divided into a medication group,an acupuncture group and an EA group,30 cases in each one.In the medication group,routine medication was provided with oral administration of celebrex for 21 days.Regular acupuncture was applied in the remaining groups,at Liángqiū(梁丘ST34),Xuèhǎi(血海SP10),Dúbí(犊鼻ST35),Nèixīyǎn(内膝眼EX-LE4),Yánglíngquán(阳陵泉GB34),Hèdǐng(鹤顶EX-LE2)and Sānyīnjiāo(三阴交SP6)and the needles were retained for 30 min.In the EA group,electric stimulation with low-frequency pulse current and dense wave was applied for 30 min on the basis of the treatment of the acupuncture group.The treatment was applied once daily at 1-day intervals after each 6-day treatment for a total of 21 days.Western Ontario and McMaster University Osteoarthritis Index(WOMAC)and visual analogy scale(VAS)scores and levels of serum inflammatory factors(interleukin-1β[IL-1β]and tumor necrosis factor[TNF-α])were used to assess the clinical therapeutic effect.Results:Following treatment,there were significant differences in the WOMAC score in the medication,acupuncture,and EA groups after treatment(all P<0.01).In the comparison among groups,after treatment,the WOMAC score in the EA group was lower than that in either the acupuncture or medication group(both P<0.01).Compared to before treatment,VAS scores were significantly different in the medication group(3.95±0.55 vs 5.75±1.40),the acupuncture group(2.78±0.38 vs 5.78±1.44)and EA group(1.72±0.38 vs 5.78±1.39)separately after treatment(all P<0.01).In the comparison among groups,after treatment,the VAS score in the EA group was lower than that in either the acupuncture or medication group(both P<0.01).Compared to before treatment,IL-1βlevels were significantly different in the medication group(31.53±6.84 vs 63.33±10.25),acupuncture group(31.70±7.54 vs63.90±9.96)and the EA groups(23.43±3.94 vs 63.10±10.66)separately after treatment(all P<0.01).IL-1βlevels were significantly lower in the EA group than in the acupuncture and medication groups(both P<0.01).Compared to before treatment,TNF-αlevels were significantly different in the medication group(40.20±6.09 vs 68.77±11.13),the acupuncture group(39.60±7.55 vs 68.33±11.51)and the EA groups(22.17±5.72 vs 68.97±10.52)separately after treatment(all P<0.01).TNF-αlevels were significantly lower in the EA group than in the acupuncture and medication groups(both P<0.01).After treatment,there were no significant differences in TNF-αand IL-1βlevels between the acupuncture and medication groups(both P>0.05).The total effective rates were 86.67%(26/30),73.33%(22/30)and70.00%(21/30)in the EA,acupuncture,and medication groups,respectively.The total effective rate was higher in the EA group than in either the acupuncture or medication group(both P<0.05).In the whole process of trial,the adverse events occurred in three groups.In consideration of the potential association between these adverse events and acupuncture treatment,the acupuncture physiotherapists and experts classified the adverse events into the treatment relevance or non-treatment relevance within 24 h of occurrence.Conclusion:All three therapeutic methods alleviated clinical symptoms of KOA and reduced levels of relevant inflammatory factors in serum.EA with dense wave is more advantageous than the traditional acupuncture technique and routine medication and is therefore worthy of clinical application.