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Rapid rupture characterization for the 2023 M_(S)6.2 Jishishan earthquake

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Earthquake Research Advances 2024年第2期4卷 22-26页

作者： Xiongwei Tang Rumeng Guo Yijun Zhang kun dai Jianqiao Xu Jiangcun Zhou Mingqiang Hou Heping Sun State Key Laboratory of Geodesy and Earth's Dynamic Innovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan430077China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing100101China Hubei Luojia Laboratory Wuhan430079China

On December 18,2023,the MS 6.2 Jishishan earthquake occurred in the northeastern region of the Qinghai-Xizang Plateau,causing heavy casualties and property damage in Gansu and Qinghai Provinces.In this study,we integrate space imaging geodesy,finite fault inversion,and back-projection methods to decipher its rupture property,including fault geometry,coseismic slip distribution,rupture direction,and propagation speed.The results reveal that the seismogenic fault dips to the southwest at an angle of 29.The major slip asperity is dominated by reverse slip and is concentrated within a depth range of 7-16 km,which explains the significant uplift near the epicenter observed by both the Sentinel-1 ascending and descending InSAR data.Moreover,the teleseismic array waveforms indicate a northwest propagating rupture with an overall slow rupture velocity of~1.91 km/s(AK array)or 1.01 km/s(AU array).

关键词： Jishishan earthquake Rupture property Space imaging geodesy Finite fault inversion Back-projection method

Antiviral treatment standards for hepatitis B:An urgent need for expansion

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World Journal of Gastroenterology 2024年第4期30卷 418-420页

作者： Zi-Hong Bao Zhi-kun dai Hao-Xian Tang Department of Infectious Diseases The First Affiliated Hospital of Shantou University Medical CollegeShantou 515041Guangdong ProvinceChina Medical College Shantou University Medical CollegeShantou 515041Guangdong ProvinceChina Department of Cardiology The First Affiliated Hospital of Shantou University Medical CollegeShantou 515041Guangdong ProvinceChina

The present letter to the editor is related to the review with the title“Past,present,and future of long-term treatment for hepatitis B virus.”Chronic hepatitis B(CHB)represents an important and pressing public health concern.Timely identification and effective antiviral therapy hold the potential to reduce liver-related mortality attributable to chronic infection with hepatitis B virus(HBV)substantially.However,the current global treatment rates for CHB remain conspicuously low,with the excessively stringent treatment criteria advocated by national CHB guidelines being a contributing factor to these low rates.Nevertheless,recent strides in comprehending this malady and the emergence of novel antiviral agents prompt the imperative re-evaluation of treatment standards to extend the sphere of potential beneficiaries.An impending need arises for a novel paradigm for the classification of patients with CHB,the expansion of antiviral treatment eligibility for HBV-infected individuals,and even the streamlining of the diagnostic process for CHB to amplify cost-effectiveness and augment survival prospects.

关键词： Hepatitis B virus Chronic hepatitis B Antiviral treatment criteria Serum alanine aminotransferase Liver-related mortality Letter to the Editor

Source characteristics of the mainshock and aftershocks of the 2019 Changning earthquake sequence:Implications for fluid effects

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Science China Earth Sciences 2023年第6期66卷 1321-1333页

作者： kun dai Yong ZHENG Rumeng GUO Jianqiao XU School of Physics Huazhong University of Science and TechnologyWuhan 430074China Innovation Academy for Precision Measurement Science and Technology Chinese Academy of SciencesWuhan 430071China State Key Laboratory of Geological Processes and Mineral Resources School of Geophysics and GeomaticsChina University of GeosciencesWuhan 430074China

The 2019 M_(S)6.0 Changning earthquake occurred in the tectonically stable Sichuan Basin,where the epicenter and its adjacent areas are important shale gas and salt mine production fields,resulting in hot debates on whether the seismogenic mechanism of the 2019 Changning earthquake is related to human activities.As source characteristics and fluid pressure can provide important constraints on whether an earthquake is induced,weinvestigate the seismogenic mechanisms of the mainshock and 9 MW≥4.0 aftershocks.In overall,the mainshock and the majority of the aftershocks are characterized by relatively shallow focal depths(1‒4 km)and significant non-double-couple(non-DC)components.However,the mainshock and the aftershocks differ in two aspects:(1)the compensated-linear-vector-dipole components dominate the non-DC components of the mainshock,whereas the isotropic components dominate the most aftershocks;(2)the fluid overpressure of the mainshock is over 30 MPa,whereas the fluid overpressure of the most aftershocks is less than 10 MPa.Thus,we propose that the mainshock is triggered by weakened fault strength with long-term fluid injection,and that its large non-DC components are associated withcomplex rupture processes.Comparatively,the aftershocks may be triggered by postseismic stress transfer by combining the Coulomb failure stress changes in the poroelastic medium.Our results highlight the possible role of fluid in the occurrence of the Changning earthquake sequence.

关键词： The 2019 Channing earthquake Induced earthquakes Non-double-couple components Focal depths Poroelasticity

Building of multifunctional and hierarchical H_(x)MoO_(3)/PNIPAM hydrogel for high-efficiency solar vapor generation

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Green Energy & Environment 2022年第5期7卷 1006-1013页

作者： Shuai Cao Jingyun Jiang Qingyong Tian Cang Guo Xuzhe Wang kun dai Qun Xu College of Materials Science and Engineering Zhengzhou UniversityZhengzhou450052China Institute of Advanced Technology Zhengzhou University Zhengzhou450052China Key Laboratory of Materials Processing and Mold Minisitry of EducationZhengzhou UniversityZhengzhou450002China

Solar distillation is a sustainable and promising technique to generate fresh water.However,the solar vapor generation is a high energy consumption process,resulting in a low water yield under natural sunlight.Hence,developing of advanced evaporators that can simultaneously reduce the energy requirement of water vaporization and accelerate solar water evaporation remains a great challenge.In this study,we report the fabrication of a multifunctional hydrogel of H_(x)Mo O_(3)/PNIPAM with PNIPAM as hydratable skeleton and H_(x)Mo O_(3) as the light-absorbing unit for solar water evaporation.The experimental results demonstrate that the as-prepared hydrogel owns excellent photothermal activity.Accurately,the fabricated hydrogel-based solar evaporators achieved high water evaporation rate of 1.65 kg m^(-2)h^(-1)with the energy conversion efficiency of 85.87%under 1 k W m^(-2)irradiation.The enhanced photothermal activity of H_(x)Mo O_(3)/PNIPAM hydrogel can be attributed to the synergistic effects of the components composed in this hierarchical architecture that change the water state and further speed up water evaporation.The H_(x)Mo O_(3)/PNIPAM evaporators indicate its great potential for practical implementation of solar water evaporation.

关键词： hydrogel distillation attributed

Facile fabrication of highly durable superhydrophobic strain sensors for subtle human motion detection

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Journal of Materials Science & Technology 2022年第15期110卷 35-42页

作者： Li-Chuan Jia Chang-Ge Zhou kun dai Ding-Xiang Yan Zhong-Ming Li College of Electrical Engineering Sichuan UniversityChengdu 610065China College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China College of Materials Science and Engineering The Key Laboratory of Material Processing and Mold of Ministry of EducationZhengzhou UniversityZhengzhou 450001China School of Aeronautics and Astronautics Sichuan UniversityChengdu 610065China

Endowing strain sensors with superhydrophobicity is of great importance to guarantee their long-term service under harsh environments(such as wet,acid,alkali and salt atmospheres),whereas,the development of superhydrophobic strain sensors remains a great challenge.Herein,we realized a superhydrophobic and highly sensitive sensor for subtle human motion detection by designing a superhydrophobic and electrically conductive coating on cotton textile,via a facile drop-coating method.The resultant strain sensor showed a large water contact angle of 161.3°and a low sliding angle of 3.8°The superhydrophobic characteristics can keep almost unchanged even after undergoing 1000 peeling cycles,1000 stretchingrelease cycles,and 1000 bending-releasing cycles,revealing its excellent mechanical robustness.High sensitivity with the maximum gage factor of 169 was achieved for the strain sensor under a small strain of0–10%,and the sensing performance also showed well durability.Moreover,our sensor can effectively detect various subtle human physiological signals and body motions even under harsh conditions.These admirable features make the sensor promising applications in wearable electronics,personalized health monitoring,sound recognition,and so on.

关键词： Strain sensors Superhydrophobicity High sensitivity Drop coating Durable

Free-standing polymer-metal-organic framework membrane with high proton conductivity and water stability

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Nano Research 2023年第5期16卷 7950-7957页

作者： Hexiang Gao Zhanpeng Gao Chao Ye Guoli Zhou Zhiwei Yang kun dai Wenjia Wu Jingtao Wang School of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China School of Chemical Engineering&Advanced Materials The University of AdelaideAdelaide 5005Australia School of Materials Science and Engineering Key Laboratory of Materials Processing and MoldMinistry of EducationZhengzhou UniversityZhengzhou 450001China

As a new class of porous material,polymer-metal-organic framework(polyMOF)has attracted tremendous interests owing to their combined advantages of polymer and crystalline MOF.However,the poor film-forming ability of polyMOF limits its widespread application,especially in membrane separation area.Herein,for the first time,we demonstrate the fabrication of freestanding polyMOF membrane.The polyMOF nanosheets are synthesized by a polymer-assisted self-inhibition crystal growth strategy.Followed by self-assembly through vacuum filtration,a 20μm-thick free-standing polyMOF membrane is constructed.Benefiting from the inclusion of polymer with hydrophobic backbone and the continuously distributed non-coordinated hydrophilic groups along polymer chain,the polyMOF membrane attains excellent structure stability against water,as well as superior proton transfer property.Proton conductivity as high as 112 and 25.6 mS·cm^(–1)is obtained by this polyMOF membrane at 100%and 20%relative humidity(RH),respectively,which are two orders of magnitude higher than those of pristine MOF.The conductivity under low humidity(20%RH)is even over 8 times higher than that of commercial Nafion membrane(3 mS·cm^(–1)).This study may provide some guidance on the development of polyMOF membranes.

关键词： polymer-metal-organic framework membrane nanosheet self-inhibition continuous transfer pathway proton conduction

Highly enhanced microwave absorption for carbon nanotube/barium ferrite composite with ultra-low carbon nanotube loading

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Journal of Materials Science & Technology 2022年第7期102卷 115-122页

作者： Yue-Yi Wang Song-Yang Wen-Jin Sun kun dai Ding-Xiang Yan Zhong-Ming Li College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China School of Aeronautics and Astronautics Sichuan UniversityChengdu 610065China

Barium ferrite(BaFe_(12)O_(19))is considered as potential microwave absorption(MA)material thanks to the large saturation magnetization,high Curie temperature,and excellent chemical stability.The integration of carbon nanotube(CNT)can improve the dielectric loss of BaFe_(12)O_(19)for further enhanced MA perfor-mance,nevertheless,the MA performance is still not desirable because of the poor CNT dispersion in the CNT/BaFe_(12)O_(19)composites,which usually prepared via the ball-milling method,unless high CNT loading was used.Herein,according to the thermal stability of CNT in different atmosphere and the formation mechanism of BaFe_(12)O_(19)from precursor,CNT was introduced in the precursor of BaFe_(12)O_(19)uniformly during auto-ignition process and calcined under different atmosphere.When CNT loading is only 2.0 wt%,the CNT/BaFe_(12)O_(19)composites obtained exhibits a minimum reflection loss(RL_(min))of-43.9 dB and effective bandwidth(with RL<-10 dB)of 3.9 GHz with the thickness of 1.5 mm,which are much supe-rior to-10.2 dB and 2.2 GHz for pure BaFe_(12)O_(19),and-13.6 dB and 2.5 GHz for CNT/BaFe_(12)O_(19)composite prepared by ball-milling method.These results may pave the way to design high-performance BaFe_(12)O_(19)based microwave absorbers.

关键词： Carbon nanotube Barium ferrite Microwave absorption

Low-temperature caproate production,microbial diversity,and metabolic pathway in xylose anaerobic fermentation

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Frontiers of Environmental Science & Engineering 2023年第3期17卷 121-130页

作者： Qingting Wang kun dai Jie Tang Sidi Hong Sijie Zheng Ting Sun Raymond Jianxiong Zeng Fang Zhang Center of Wastewater Resource Recovery College of Resources and EnvironmentFujian Agriculture and Forestry UniversityFuzhou 350002China

Mixed culture fermentation(MCF)is challenged by the unqualified activity of enriched bacteria and unwanted methane dissolution under low temperatures.In this work,caproate production from xylose was investigated by MCF at a low temperature(20°C).The results showed that a 9 d long hydraulic retention time(HRT)in a continuously stirred tank reactor was necessary for caproate production(~0.3 g/L,equal to 0.6 g COD/L)from xylose(10 g/L).The caproate concentration in the batch mode was further increased to 1.6 g/L.However,changing the substrate to ethanol did not promote caproate production,resulting in~1.0 g/L after 45 d of operation.Four genera,Bifidobacterium,Caproiciproducens,Actinomyces,and Clostridium_sensu_stricto_12,were identified as the enriched caproate-producing bacteria.The enzymes in the fatty acid biosynthesis(FAB)pathway for caproate production were identified via metagenomic analysis.The enzymes for the conversion of(C_(n+2))-2,3-Dehydroxyacyl-CoA to(C_(n+2))-Acyl-CoA(i.e.,EC 1.***.1.8 and EC 1.***.1.38)in the reverseβ-oxidation(RBO)pathway were not identified.These results could extend the understanding of low-temperature caproate production.

关键词： Xylose fermentation Caproate Low temperature Bifidobacterium FAB pathway RBO pathway

One-step and Continuous Fabrication of Coaxial Piezoelectric Fiber for Sensing Application

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Chinese Journal of Polymer Science 2023年第11期41卷 1778-1785,I0009页

作者： Shuai-Shuai Gui Bing-Xu Da Fei Peng Guo-Qiang Zheng kun dai Chun-Tai Liu Chang-Yu Shen College of Materials Science and Engineering Key Laboratory of Material Processing and Mold(Ministry of Education)Henan Key Laboratory of Advanced Nylon Materials and ApplicationZhengzhou UniversityZhengzhou 450001China

Although there has been rapid advancement in piezoelectric sensors,challenges still remain in developing wearable piezoelectric sensors by a one-step,continuous and environmentally friendly method.In this work,a 1D flexible coaxial piezoelectric fiber was directly fabricated by melt extrusion molding,whose core and sheath layer are respectively slender steel wire(i.e.,electrode)and PVDF(i.e.,piezoelectric layer).Moreover,such 1D flexible coaxial piezoelectric fiber possesses short response time and high sensitivity,which can be used as a selfpowered sensor for bending and vibration sensing.More interestingly,such 1D flexible coaxial piezoelectric fiber(1D-PFs)can be further endowed with 3D helical structure.Moreover,a wearable and washable motion monitoring system can be constructed via braiding such 3D helical piezoelectric fiber(3D-PF)into commercial textiles.This work paves a new way for developing 1D and 3D piezoelectric fibers through a one-step,continuous and environmentally friendly method,showing potential applications in the field of sensing and wearable electronics.

关键词： Coaxial piezoelectric fiber Melt extrusion molding Bending and vibration sensing Motion monitoring system