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Effect of trigger system on experimental dispersion characteristics of active surface wave testing

Earthquake Engineering and Engineering Vibration 2024年第2期23卷 311-318页

作者： lin Shibin Jeramy C.Ashlock zhu Liming Qin Zexiang Li Bo zhu Xingji Zhai Changhai State Key Laboratory of Precision Blasting Jianghan UniversityWuhan 430056China Hubei Key Laboratory of Blasting Engineering Jianghan UniversityWuhan 430056China Department of Civil Construction&Environmental EngineeringIowa State UniversityAmesIA 50010USA Wuhan Airport Road Development Co. Ltd.Wuhan 430065China School of Civil and Environmental Engineering Harbin Institute of TechnologyShenzhen 518055China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of TechnologyHarbin 150090China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disaster of the Ministry of Industry and Information Technology Harbin Institute of TechnologyHarbin 150090China

A trigger system is typically employed in active seismic testing to trigger and synchronize multichannel surface wave data *** effect of the trigger system on the dispersion image of surface waves is empirically known to be negligible,however,theoretical explanation regarding the effect of the trigger system is *** study systematically examines the theory for surface wave dispersion analysis and proves that the effect of the trigger system on a dispersion image is negligible via a solid theoretical ***,based on the new theoretical explanation,an alternative method that uses only the relative phase difference between sensors to extract dispersion characteristics with better conceptual clarity is *** active surface wave testing cases are considered to validate the theory and *** results indicate that(1)an accurate trigger system is not necessary for surface wave data acquisition,and(2)it is unnecessary to assume that the impact point is the generation point of the surface waves for the experimental dispersion analysis.

关键词： site investigation surface waves data acquisition dispersion

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Mechanism of local solidification time variations with melt rate during vacuum arc remelting process of 8Cr4Mo4V high-strength steel

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Journal of Iron and Steel Research International 2024年第2期31卷 377-388页

作者： Tao Pan Hong-chun zhu Zhou-hua Jiang Hua-bing Li rui Zhang Hao Feng School of Metallurgy Northeastern UniversityShenyang110819LiaoningChina State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819LiaoningChina

A 2D axisymmetric numerical model was established to investigate the variations of molten pool with different melt rates during the vacuum arc remelting of 8Cr4Mo4V high-strength steel,and the ingot growth was simulated by dynamic mesh *** results show that as the ingot grows,the molten pool profile changes from shallow and flat to V-shaped,and both the molten pool depth and the mushy width ***,the variation of both the molten pool shape and the mushy width melt rate is clarified by the thermal equilibrium *** melt rate increases,both the molten pool depth and the mushy width *** is caused by the increment in sensible heat stored in the ingot due to the limitation of the cooling capacity of the *** nonlinear increment in sensible heat leads to a nonlinear increase in the mushy *** addition,as melt rate increases,the local solidification time(LST)of ingot decreases obviously at first and then *** melt rate is controlled in a suitable range,LST is the lowest and the secondary dendrite arm spacing of the ingot is the smallest,which can effectively improve the compactness degree of 8Cr4Mo4V high-strength steel.

关键词： 8Cr4Mo4V high-strength steel Vacuum arc remelting process Melt rate Molten pool Local solidification time

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A Multi-AGV Routing Planning Method Based on Deep Reinforcement Learning and Recurrent Neural Network

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IEEE/CAA Journal of Automatica Sinica 2024年第7期11卷 1720-1722页

作者： Yishuai lin Gang Hu Liang Wang Qingshan Li Jiawei zhu the School of Computer Science and Technology Xidian UniversityXi’an 710000China Suzhou Mingyi Intelligence Warehousing Information Technology Co. Ltd.Kunshan 215300China the School of Information Engineering Chang’an UniversityXi’an 710000China

Dear Editor,This letter presents a multi-automated guided vehicles(AGV) routing planning method based on deep reinforcement learning(DRL)and recurrent neural network(RNN), specifically utilizing proximal policy optimi... 详细信息

关键词： network AGV Deep

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Influence of ion size on the charge storage mechanism of MXenes:a combination of experimental and computational

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Waste Disposal and Sustainable Energy 2024年第2期6卷 163-171页

作者： Huiwen Wan rui Wang Huiyang Fan Hongbo Gao Yucheng Chen zhu Liu State Key Laboratory of Clean Energy Utilization Institute for Thermal Power EngineeringCollege of Energy EngineeringZhejiang UniversityHangzhou 310027China China North Vehicle Research Institute No.4 HuaishulingFengtai DistrictBeijingChina ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang UniversityHangzhou 311215China

MXene nanomaterials have attracted great interest as the electrode of ***,its energy storage mecha-nisms in organic electrolytes are still *** work investigated the size effect of cations(i.e.,Lit,Nat,K^(+),and EMIM^(+))on the capacitive behaviors of MXene-based *** experimental results demonstrate that the specific capacitance increases obviously with decreasing cation size(i.e.,from 43 F g^(-1)(EMIM^(+))to 129 F g^(-1)(Li^(+))at 2 mV s^(-1)).Density-functional theory calculation reveals a correlation between cation size and ion-electrode surface interaction,sup-porting experimental observations of the capacitive-dominant *** dynamics simulations reveal that the ionic solvation structure and desolvation degree of intercalated cations as a function of solvation size,providing dynamic insights into the experimentally observed specific capacitance *** comprehensive experimental and computational study provides valuable insights into the intricate solvation effects governing the charge storage *** finding of ion dynamics,solvation structure,and desolvation may contribute to guide the design and optimization of appropriate ions/electrolytes combinations for MXene-based supercapacitors.

关键词： MXene Cations Molecular dynamics simulation Density-functional theory calculation Supercapacitors

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生物素酶缺乏症13例临床分析及随访

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广东医学 2024年第6期45卷 672-678页

作者：林瑞珠李秀珍赵小媛刘宗才盛慧英苏玲蔡燕娜尹曦张文饶敏广州医科大学附属妇女儿童医疗中心遗传与内分泌科广东广州510623

目的探讨生物素酶缺乏症(BTD)的临床特点、诊治和预后转归。方法收集13例BTD患儿的临床资料,应用气相色谱质谱(GC/MS)联用尿液有机酸分析、外周血生物素酶(BT)活性测定、聚合酶链反应-直接测序方法对BT基因的各个外显子及其两侧侧翼序... 详细信息

目的探讨生物素酶缺乏症(BTD)的临床特点、诊治和预后转归。方法收集13例BTD患儿的临床资料,应用气相色谱质谱(GC/MS)联用尿液有机酸分析、外周血生物素酶(BT)活性测定、聚合酶链反应-直接测序方法对BT基因的各个外显子及其两侧侧翼序列进行突变的检测,并对患儿进行随诊。结果13例患儿均检出BT基因突变,其中男8例,女5例,主要临床表现为反复气促(100%,13例)、皮疹(61.5%,8例)、抽搐(38.5%,5例)等。12例患儿(92.3%)尿液GC/MS分析提示3-羟基异戊酸升高,血气分析示持续性代谢性酸中毒、高乳酸血症。所有患儿均给予生物素治疗,48h内代谢紊乱纠正。随诊1~11年平均(4.681±2.739)年,均未再发代谢异常,体格、智力发育正常。结论反复皮肤黏膜损害、气促、反复癫痫发作、代谢性酸中毒、高乳酸血症是BTD的主要临床特征,对可疑患儿应尽早进行血尿代谢产物筛查及生物素酶活性测定,早期开始生物素治疗疗效显著,长期随诊预后良好。

关键词：生物素酶生物素基因生物素临床特征随访

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Application of mesenchymal stem cell therapy for premature ovarian insufficiency: Recent advances from mechanisms to therapeutics

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World Journal of Stem Cells 2024年第1期16卷 1-6页

作者： Hang-Qi Hu Xi-Yan Xin Yu-Tian zhu rui-Wen Fan Hao-lin Zhang Yang Ye Dong Li Department of Traditional Chinese Medicine Peking University Third HospitalBeijing 100191China

The incidence of premature ovarian insufficiency(POI)is increasing worldwide,particularly among younger women,posing a significant challenge to *** addition to menopausal symptoms,POI leads to several complications that profoundly affect female reproductive function and overall ***,current clinical treatment strategies for this condition are limited and often yield unsatisfactory *** approaches typically involve hormone repla-cement therapy combined with psychological ***,mesenchymal stem cell(MSC)therapies for POI have garnered considerable attention in global *** can restore ovarian reproductive and endocrine functions through diverse mechanisms,including controlling differentiation,promoting angiogenesis,regulating ovarian fibrosis,inhibiting apoptosis,enhancing autocrine and paracrine effects,suppressing inflammation,modulating the immune system,and genetic *** editorial offers a succinct summary of the application of MSC therapy in the context of POI,providing evidence for groundbreaking medical approaches that have potential to enhance reproductive health and overall well-being for women.

关键词： Mesenchymal stem cell therapy Mechanism Premature ovarian insufficiency Therapeutic Women

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Mangrove wetlands distribution status identification, changing trend analyzation and carbon storage assessment of China

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China Geology 2024年第1期7卷 1-11页

作者： Chang Li Fu Wang Peng Yang Fei-cui Wang Yun-zhuang Hu Yan-lin Zhao Li-zhu Tian rui-bin Zhao Tianjin Center(North China Center of Geoscience Innovation) China Geological Survey(CGS)Tianjin 300170China Tangshan Hydrological Survey and Research Center of Heibei Province Tangshan063000China Key Laboratory of Coast Geo-Environment China Geological SurveyCGSTianjin 300170China Tianjin Key Laboratory of Coast Geological Processes and Environmental Safety Tianjin 300170China

This research investigates the ecological importance,changes,and status of mangrove wetlands along China’s *** interpretation,geological surveys,and ISO clustering unsupervised classification methods are employed to interpret mangrove distribution from remote sensing images from 2021,utilizing ArcGIS software ***,the carbon storage capacity of mangrove wetlands is quantified using the carbon storage module of InVEST *** show that the mangrove wetlands in China covered an area of 278.85 km2 in 2021,predominantly distributed in Hainan,Guangxi,Guangdong,Fujian,Zhejiang,Taiwan,Hong Kong,and *** total carbon storage is assessed at 2.11×10^(6) t,with specific regional data *** since the 1950s reveal periods of increase,decrease,sharp decrease,and slight-steady increases in mangrove areas in *** important finding is the predominant replacement of natural coastlines adjacent to mangrove wetlands by artificial ones,highlighting the need for creating suitable spaces for mangrove *** study is poised to guide future mangroverelated investigations and conservation strategies.

关键词： Mangrove Wetland Carbon storage Ecological conservation ArcGIS software platform Restoration InVEST model Quantitative analysis Coastal zone of China

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Effects of water molecules on luminescence in europium and terbium coordination polymers with p-fluorobenzoic acid as ligand

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Journal of Rare Earths 2024年第7期42卷 1258-1264,I0003页

作者： Xiaoqi Zhao Puyan Hao Yami ling Mengzhen Jia rui zhu Jiawen Liu Qiang Xu Jianhong Zhou Collaborative Innovation Center of Rare-Earth Optical Functional Materials and Devices Development Baoji Key Laboratory of Micro-Nano Optoelectronics and Terahertz TechnologySchool of Physics and Opto-Electronic TechnologyBaoji University of Arts and SciencesBaoji721016China

Our previous experimental observations show that the crystal structure of lanthanide luminescent complexes synthesized in aqueous solution usually contains a large number of coordination water molecules or free water *** order to probe the influence of water molecules on luminescent processes of lanthanide complexes,the photoluminescence properties of Ln-FBA(Ln=Eu and Tb,FBA=p-fluorobenzoic acid)coordination polymers at different ambient temperatures,in different solvents and aqueous DMSO solutions with different volume concentrations were systematically *** experiment results show that the presence of water molecules can promote the energy transfer from FBA ligand to Ln3+,at the same time,can cause luminescent non-radiation quenching of lanthanide *** addition,the variation of emission intensity ratio of 615 nm/591 nm peaks of Eu^(3+)with increasing the volume concentration of H_(2)O can be potentially used for the quantitatively detection of water traces in organic *** order to suppress the non-radiation quenching caused by the water molecules,Ln-FBA(Ln=Eu and Tb)coordination polymers were embedded into the PVP matrix to prepare Ln-FBA@PVP hybrid *** photoluminescence investigation indicates that PVP can not only block the quenching effect of water molecules on luminescence,but also effectively sensitize Eu^(3+)and Tb^(3+)*** experimental conclusions are useful for probing the influence of water molecules on luminescent processes of lanthanide complexes,quantitatively detecting water traces in organic solvents and enhancing the photoluminescence intensity in lanthanide complexes.

关键词： Lanthanide complexes Photoluminescence Luminescent quenching Rare earths

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Association of acute glycemic parameters at admission with cardiovascular mortality in the oldest old with acute myocardial infarction

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Journal of Geriatric Cardiology 2024年第3期21卷 349-358页

作者： Hui-Hui LIU Meng ZHANG Yuan-lin GUO Cheng-Gang zhu Na-Qiong WU Ying GAO rui-Xia XU Jie QIAN Ke-Fei DOU Jian-Jun LI Cardiometabolic Center State Key Laboratory of Cardiovascular DiseaseFuwai HospitalNational Center for Cardiovascular DiseasesNational Clinical Research Center for Cardiovascular DiseasesChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijingChina

OBJECTIVES Stress-related glycemic indicators,including admission blood glucose(ABG),stress-hyperglycemia ratio(SHR),and glycemic gap(GG),have been associated with worse outcomes after acute myocardial infarction(AMI).However,data regarding their prognostic value in the oldest old with AMI are ***,this study aimed to investigate the association of stress-related glycemic indicators with short-and long-term cardiovascular mortality(CVM)in the oldest old(≥80 years)with *** In this prospective study,a total of 933 consecutive old patients with AMI admitted to FuWai hospital(Beijing,China)were *** admission,ABG,SHR,and GG were assessed and all participants were classified according to their ***-Meier,restricted cubic splines(RCS),and multivariate Cox regression analyses were performed to evaluate the association between these glycemic indicators and CVM within 30 days and long-term *** During an average of 1954 patient-years of follow-up,a total of 250 cardiovascular deaths were ***-Meier analyses showed the lowest CVM in quartile 1 of ABG and in quartile 2 of SHR and *** adjusting for potential covariates,patients in quartile 4 of ABG,SHR,and GG had a respective 1.67-fold(95%CI:1.03-2.69;P=0.036),1.80-fold(95%CI:1.16-2.79;P=0.009),and 1.78-fold(95%CI:1.14-2.79;P=0.011)higher risk of long-term CVM risk compared to those in the reference groups(quartile 1 of ABG and quartile 2 of SHR and GG).Furthermore,RCS suggested a J-shaped relationship of ABG and a Ushaped association of SHR and GG with long-term ***,we observed similar associations of these acute glycemic parameters with 30-day *** Our data first indicated that SHR and GG consistently had a U-shaped association with both 30-day and longterm CVM among the oldest old with AMI,suggesting that they may be useful for risk stratification in this special population.

关键词： admitted infarction shaped

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Biomimetic Phosphohydrolase Nanozyme Based on Defect-Engineered Metal-Organic Framework

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CCS Chemistry 2024年第7期6卷 1821-1835页

作者： Xiaoxue Kou Yuhong lin Yong Shen linjing Tong rui Gao Suya Liu Siming Huang Fang zhu Guosheng Chen Gangfeng Ouyang MOE Key Laboratory of Bioinorganic and Synthetic Chemistry School of ChemistrySun Yat-sen UniversityGuangzhou 510006 Shanghai NanoPort Thermo Fisher ScientificPudong DistrictShanghai 200120 Guangzhou Municipal and Guangdong Provincial Key Laboratory of Molecular Target and Clinical Pharmacology The NMPA and State Key Laboratory of Respiratory DiseaseSchool of Pharmaceutical Sciences and The Fifth Affiliated HospitalGuangzhou Medical UniversityGuangzhou 511436

Phosphodiester bonds are the backbone linkages of all the nucleic acids which store and transfer biological *** hydrolysis of phosphodiester bonds is of great importance to the replication,recombination,and damage repair of DNA as well as the maturation and processing of ***,the spontaneous scission of individual phosphodiester linkages is kinetically challenging under physiological conditions,with an estimated half-life of 30 million ***,we discover a defect-engineered Zr-metal-organic framework(Zr-MOF)nanozyme containing cluster-missing reo defects,named UiO-66 REO,that possesses intrinsic phosphodiesterase-like activity that allows for the cleavage of the phosphodiester bond in physiological condition(pH=7.4 and 37℃),outperforming the activityrecording *** atomic-level structure of the UiO-66 REO nanozyme has been directly identified by the synchrotron radiation absorption spectrum and integrated differential phase contrast-scanning transmission electron *** find that both the defective boundary regions and unusual Zr6-clusters formed in the reo phase of the UiO-66 REO nanozyme contribute to the improvement in efficiency of phosphodiesterase-like hydrolysis,which realizes the cleavage of DNA in mild *** work offers a new insight into biomimetic enzymology using crystal and defect engineering and opens up new possibilities for the development of low-cost,structurally stable and sustainable phosphodiesterase nanozymes for different biological applications.

关键词： nanozyme metal-organic framework biomimetic catalysis hydrolase-like activity defective engineering

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