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AE waveform characteristics of rock mass under uniaxial loading based on Hilbert-Huang transform

Journal of Central South University 2021年第6期28卷 1843-1856页

作者： LI Xue-long CHEN Shao-jie LIU Shu-min LI Zhong-hui Mine Disaster Prevention and Control-Ministry of State Key Laboratory Breeding Base Shandong University of Science and TechnologyQingdao 266590China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and TechnologyXuzhou 221116China College of Energy and Mining Engineering Shandong University of Science and TechnologyQingdao 266590China State Key Laboratory of Coal Mine Disaster Dynamics and Control College of Resource and Safety EngineeringChongqing UniversityChongqing 400030China

Acoustic Emission(AE)waveforms contain information on microscopic structural features that can be related with damage of coal rock *** this paper,the Hilbert-Huang transform(HHT)method is used to obtain detailed structural characteristics of coal rock masses associated with damage,at different loading stages,from the analyses of the characteristics of AE *** results show that the HHT method can be used to decompose the target waveform into multiple intrinsic mode function(IMF)components,with the energy mainly concentrated in the c1−c4 IMF components,where the c1 component has the highest frequency and the largest amount of *** the loading continues,the proportion of energy occupied by the low-frequency IMF component shows an increasing *** the initial compaction stage,the Hilbert marginal spectrum is mainly concentrated in the low frequency range of 0−40 *** plastic deformation stage is associated to energy accumulation in the frequency range of 0−25 kHz and 200−350 kHz,while the instability damage stage is mainly concentrated in the frequency range of 0−25 *** 20 kHz,the instability damage reaches its maximum *** is a relatively clear instantaneous energy peak at each stage,albeit being more distinct at the beginning and at the end of the compaction *** the effective duration of the waveform is short,its resulting energy is small,and so there is a relatively high value from the instantaneous energy *** waveform lasts a relatively long time after the peak that coincides with failure,which is the period where the waveform reaches its maximum energy *** Hilbert three-dimensional energy spectrum is generally zero in the region where the real energy is *** addition,its energy spectrum is intermittent rather than *** is therefore consistent with the characteristics of the several dynamic ranges mentioned above,and it indicates more clearly the low-frequency energy concentration in the critical sta

关键词： acoustic emission waveform Hilbert-Huang transform coal rock

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制备具有优异弯曲性能的轻质3D互穿NiTi@Mg复合材料(英文)

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Transactions of Nonferrous Metals Society of China 2023年

作者：刘玉敬刘小春李坤茂吴翔周圣丰李卫张文财长沙理工大学材料科学与工程学院金属研究所暨南大学先进耐磨蚀及功能材料研究院重庆大学机械传动国家重点实验室暨南大学附属第一医院骨科

采用增材制造(AM)与熔渗技术相结合，开发了一种新型高强轻质互穿相复合材料NiTi@Mg，并对NiTi@Mg复合材料的界面结合、弯曲和循环强化性能进行研究。结果表明，AM-NiTi支架与Mg熔渗制备了具有冶金结合界面的互穿相NiTi@Mg复合材料。与N... 详细信息

采用增材制造(AM)与熔渗技术相结合，开发了一种新型高强轻质互穿相复合材料NiTi@Mg，并对NiTi@Mg复合材料的界面结合、弯曲和循环强化性能进行研究。结果表明，AM-NiTi支架与Mg熔渗制备了具有冶金结合界面的互穿相NiTi@Mg复合材料。与NiTi支架相比，NiTi@Mg互穿相复合材料的弯曲强度提高2.5倍，压缩强度提高1.7倍。在弯曲过程中，观察到大量位错堆积在界面处的软Mg区域。此外，有限元模型(FEM)显示，弯曲过程中裂纹萌生的应力集中区位于NiTi与Mg的界面处。NiTi@Mg复合材料的强化机制归因于Mg的孪生强化和异质结构强化。

关键词：金属复合材料 NiTi@Mg 弯曲性能有限元模拟强化机制

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无序Ru-O构型对电化学析氢催化性能研究

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电化学 2022年第10期28卷 79-89页

作者：孙雪宋亚杰李仁龙王家钧哈尔滨工业大学工信部新能源转换与存储关键材料技术重点实验室黑龙江哈尔滨150001 哈尔滨工业大学重庆研究院四川重庆401135

相工程被认为是调节催化剂电子结构和催化活性的有效方法。非晶材料的无序构型允许表面电子结构的灵活重整,显示出其作为析氢反应(HER)催化剂的吸引力。在此,我们设计并开发了一种具有无序Ru-O构型的非晶催化剂(a-RuO_(2))。结合先进的... 详细信息

相工程被认为是调节催化剂电子结构和催化活性的有效方法。非晶材料的无序构型允许表面电子结构的灵活重整,显示出其作为析氢反应(HER)催化剂的吸引力。在此,我们设计并开发了一种具有无序Ru-O构型的非晶催化剂(a-RuO_(2))。结合先进的电镜技术和详细的电化学测试,建立了Ru-O有序性与HER性能的构效关系。具体来说,无序的Ru-O配位显著增强了酸性和碱性HER中的催化活性,最终使经济性更高的a-RuO_(2)催化性能接近商业Pt/C。此外,在10 mA·cm^(-2)下进行10 h电流-时间(i-t)测试后,a-RuO_(2)表现出极好的稳定性。进一步的理论模拟显示a-RuO_(2)较低的d带中心和优化的电子输运调制了活性位点对中间反应物的吸附强度,促进了HER动力学。这项工作为通过相工程探索高活性HER催化剂提供了新的观点。

关键词：相工程电化学析氢非晶催化剂电子结构

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Investigation on the short-term outcome and prognostic impact of predisposition,and precipitants in inpatients with chronic liver disease from Chinese AcuTe on CHronic LIver FailurE(CATCH-LIFE)cohorts

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Portal Hypertension & Cirrhosis 2023年第3期2卷 115-126页

作者： Yan Zhang Wenting Tan Xiaobo Wang Xin Zheng Yan Huang Beiling Li Zhongji Meng Yanhang Gao Zhiping Qian Feng Liu Xiaobo Lu Jia Shang Yubao Zheng Weituo Zhang Shan Yin Wenyi Gu Tongyu Wang Jianyi Wei Zixuan Shen Guohong Deng Yi Zhou Yixin Hou Qun Zhang Shue Xiong Jing Liu Liyuan Long Ruochan Chen Jinjun Chen Xiuhua Jiang Sen Luo Yuanyuan Chen Chang Jiang Jinming Zhao Liujuan Ji Xue Mei Jing Li Tao Li Rongjiong Zheng Xinyi Zhou Haotang Ren Yu Shi Hai Li for the CATCH‐LIFE Study Investigators of Chinese(Acute‐on)Chronic Liver Failure(CLIF)Consortium(Ch‐CLIFC) Department of Gastroenterology Ren Ji HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghaiChina Shanghai Institute of Digestive Disease NHC Key Laboratory of Digestive DiseasesShanghaiChina Department of Infectious Diseases Southwest HospitalThird Military Medical University(Army Medical University)ChongqingChina Center of Integrative Medicine Beijing Ditan HospitalCapital Medical UniversityBeijingChina Department of Infectious Diseases Institute of Infection and ImmunologyUnion HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubeiChina Hunan Key Laboratory of Viral Hepatitis Department of Infectious DiseasesXiangya HospitalCentral South UniversityChangshaHunanChina Department of Infectious Diseases Hepatology UnitNanfang HospitalSouthern Medical UniversityGuangzhouGuangdongChina Department of Infectious Disease Taihe HospitalHubei University of MedicineShiyanHubeiChina Department of Hepatology The First Hospital of Jilin UniversityJilinChangchunChina Department of Liver Intensive Care Unit Shanghai Public Health Clinical CentreFudan UniversityShanghaiChina Tianjin Institute of Hepatology Nankai University Second People's HospitalTianjinChina Department of Infectious Diseases and Hepatology The Second Hospital of Shandong UniversityJinanShandongChina Infectious Disease Center The First Affiliated Hospital of Xinjiang Medical UniversityUrumqiXinjiangChina Department of Infectious Diseases Henan Provincial People's HospitalZhengzhouHenanChina Deparment of Infectious Diseases The Third Affiliated Hospital of Sun Yat-sen UniversityGuangzhou CityGuangdongChina Clinical Research Center Shanghai Jiao Tong University School of MedicineShanghaiChina The State Key Laboratory for Diagnosis and Treatment of Infectious Diseases The First Affiliated Hospital of School of MedicineZhejiang UniversityHangzhouZhejiangChina Collaborative Innovation Center for Diagnosis and Treatment of Infectious Disease HangzhouZhejiangChina Nati

Aim:The study aimed to investigate the short-term outcomes of hospitalized patients with chronic liver disease(CLDs)and assess the prognostic impact of predisposition and precipitants,which currently remains ***:The study included 3970 hospitalized patients with CLDs from two prospective longitudinal multicenter studies(NCT02457637 and NCT03641872)conducted in highly endemic hepatitis B virus(HBV)*** risk analysis was used to evaluate the effect of predispositions,including the etiology and severity of CLDs and precipitants;on sequential 28,90,and 365-day liver transplantation(LT)-free ***:Among all enrolled patients,76.8%of adverse outcomes(including death and LT)within one year occurred within 90 *** with alcoholic etiology,the association of HBV etiology with poorer outcomes was remarkably on the 28th day(hazard ratio[HR],1.81;95%confidence interval[CI],1.07-3.06;p=0.026);however,and dimin-ished or became insignificant at 90 days and 365 *** increased the adjusted risk for 365-day(HR,1.50;CI,1.13-1.99;p=0.004)LT-free mortality when compared with *** patients with cirrhosis,prior decompensation(PD)independently increased the adjusted risk of 365-day LT-free mortality by 1.25-fold(p=0.021);however,it did not increase the risk for 90-day *** the category nor the number of precipitants influenced the adjusted risk of 28 or 90-day LT-free ***:The 90-day outcome should be considered a significant endpoint for evaluating the short-term prognosis of hospitalized patients with *** factors,other than etiology,mainly affected the delayed(365-day)*** effective therapy for CLD etiology,especially antiviral treatments for HBV,and post-discharge long-term surveillance monitoring in cirrhotic patients undergoing PD are suggested to enhance disease management and reduce mortality.

关键词： cirrhosis precipitant prior decompensation short‐term mortality

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