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急性颈脊髓损伤髓内出血水肿患者术后神经功能恢复的风险因素分析

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颈腰痛杂志 2024年第2期45卷 258-262,267页

作者：段伟利王淼陈双辉南阳市中医院独山院区脊柱一科河南南阳473000

目的观察伴髓内出血水肿的急性颈脊髓损伤(cervical spinal cord injury,CSCI)患者的手术减压效果,并分析术后神经功能恢复不良的预测因素。方法回顾性分析该院于2018年3月~2022年3月收治的71例伴髓内出血水肿的急性CSCI患者资料,测量... 详细信息

目的观察伴髓内出血水肿的急性颈脊髓损伤(cervical spinal cord injury,CSCI)患者的手术减压效果,并分析术后神经功能恢复不良的预测因素。方法回顾性分析该院于2018年3月~2022年3月收治的71例伴髓内出血水肿的急性CSCI患者资料,测量其术前MRI所示的髓内出血信号长度(intramedullary hemorrhage length,IHL)、髓内水肿信号长度(intramedullary edema length,IEL)、脊髓受压指数(maximum spinal cord compression,MSCC)等指标。于术前、术后3 d时,评价其ASIA运动评分(the ASIA motor score,AMS),并计算其AMS恢复率;术后6个月,以AIS分级改善≥1级判定为术后神经功能恢复(改善组),以AIS分级未改善甚至加重判定为术后神经功能未恢复(未改善组)。比较两组患者的相关资料,并采用多元Logistic回归分析得出CSCI患者术后神经功能恢复不良的预测因素。结果术后6个月,有54例(76.1%)患者的神经功能AIS分级改善了1级或以上,17例(23.9%)的AIS分级未见改善。两组患者的性别、年龄、创伤原因、伤后就诊时间、受伤至手术时间、术前AIS分级、软组织损伤情况和手术入路、术后康复训练情况等资料的差异均无统计学意义(P>0.05)。未改善组患者的术前IHL、IEL和MSCC指数显著高于改善组(P0.05),但未改善组患者术后3 d的AMS评分和AMS改善率均显著低于改善组(P<0.05)。多元Logistic回归分析显示:术后3 d的AMS评分恢复率(OR=0.752,P=0.040)和术前IHL(OR=1.805,P=0.032)均是CSCA患者术后6个月神经功能恢复不良的独立预测因素。结论伴髓内出血水肿的CSCA患者脊髓损伤较重,术前MRI所见的IHL信号越长、术后3 d的AMS评分恢复率越低,则预示着患者术后远期神经功能恢复不良的风险越高。

关键词：急性颈脊髓损伤髓内出血水肿 MRI检查 T2加权像 AIS分级预后不良

Particle distributions in Lamb wave based acoustofluidics

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Nanotechnology and Precision Engineering 2024年第2期7卷 60-68页

作者： Chuanchao Zhang Xian Chen wei wei Xuejiao Chen Quanning li Xuexin duan Key Laboratory of Precision Measuring Technology and Instruments College of Precision Instrument and Optoelectronics EngineeringTianjin UniversityTianjin300072China

Acoustic streaming enabled by a Lamb wave resonator(LWR)is efficient for particle trapping and enrichment in microfluidic ***,because Lamb waves combine the features of bulk acoustic waves and surface acoustic waves,the resulting acoustic streaming in the LWR occurs in multiple planes,and the particle flow behavior in this acoustofluidic system is largely *** here are numerical simulations and laboratory experiments conducted to investigate the boundary conditions for particle motion inside a microvortex induced by an *** dynamic capture,the particles’trajectories become orbital paths within an acoustic *** suspended particles encounter two distinct acoustic phenomena,i.e.,the drag force resulting from acoustic streaming and the acoustic radiation force,which exert forces in various directions on the *** the acoustic radiation force and the fluid drag force are dominant for large and small particles in a mixed solution,respectively,the large particles reside within the vortex while the small particles remain at its ***,when the acoustic radiation force is dominant for both types of particles,the distribution pattern is reversed.

关键词： Acoustofluidics Lamb wave resonator Particle manipulation Microvortex

Spatial-temporal variability of throughfall in a subtropical deciduous forest from the hilly regions of eastern China

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Journal of Mountain Science 2019年第8期16卷 1788-1801页

作者： ZHANG Hai-xia WU Hua-wu li Jing HE Bin liU Jiu-fu WANG Niu duan wei-li liAO Ai-min Key Laboratory of Watershed Geographic Sciences Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China Chuzhou Hydrology Laboratory Nanjing Hydraulic Research InstitutesNanjing 210029China Tourism School Jiujiang CollegeJiujiang 332005China State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China

Throughfall variability plays a crucial role in regulating hydrological and biogeochemical processes in forest ecosystems. However, throughfall variability and its potential influencing factors remain unclear in the subtropical deciduous forest because of its complex canopy and meteorological conditions. Here, the spatial variability and temporal stability of throughfall were investigated from October 2016 to December 2017 within a deciduous forest in the subtropical hilly regions of eastern China, and the effects of meteorological variables and distance from nearest tree trunk on throughfall variability were systematically evaluated. Throughfall variability during the leafed period was slightly higher than that during the leafless period inferred from the coefficient of variation of throughfall amounts(CVTF), with 13.2%-40.9% and 18.7%-31.9%, respectively. The multiple regression model analysis suggested that the controlling factors of throughfall variability were different in studied periods: Maximum 10-min rainfall intensity, wind speed and air temperature were the dominant influencing factors on throughfall variability during the leafed period, with the relative contribution ratio(RCR) of 25.9%, 18.7% and 8.9%, respectively. By contrast, throughfall variability was affected mainly by the mean rainfall intensity(RCR=40.8%) during the leafless period. The temporal stability plots and geostatistical analysis indicated that spatial patterns of throughfall were stable and similar among rainfall events. Our findings highlight the important role of various meteorological factors in throughfall variability and are expected to contribute to the accurate assessment of throughfall, soil water and runoff within the subtropical forests.

关键词： Throughfall variability Spatial heterogeneity Temporal stability Meteorological variables Canopy structure Subtropical forest

Theoretical and experimental investigation of the resonance responses and chaotic dynamics of a bistable laminated composite shell in the dynamic snap-through mode

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Applied Mathematics and Mechanics(English Edition) 2024年第4期45卷 581-602页

作者： Meiqi WU Pengyu LV Hongyuan li Jiale YAN Huiling duan wei ZHANG State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering ScienceBIC-ESATCollege of EngineeringPeking UniversityBeijing 100871China Nanchang Innovation Institute of Peking University Nanchang 330096China Department of Mechanics Guangxi UniversityNanning 530004China

The dynamic model of a bistable laminated composite shell simply supported by four corners is further developed to investigate the resonance responses and chaotic *** existence of the 1:1 resonance relationship between two order vibration modes of the system is *** resonance response of this class of bistable structures in the dynamic snap-through mode is investigated,and the four-dimensional(4D)nonlinear modulation equations are derived based on the 1:1 internal resonance relationship by means of the multiple scales *** Hopf bifurcation and instability interval of the amplitude frequency and force amplitude curves are *** discussion focuses on investigating the effects of key parameters,e.g.,excitation amplitude,damping coefficient,and detuning parameters,on the resonance *** numerical simulations show that the foundation excitation and the degree of coupling between the vibration modes exert a substantial effect on the chaotic dynamics of the ***,the significant motions under particular excitation conditions are visualized by bifurcation diagrams,time histories,phase portraits,three-dimensional(3D)phase portraits,and Poincare ***,the vibration experiment is carried out to study the amplitude frequency responses and bifurcation characteristics for the bistable laminated composite shell,yielding results that are qualitatively consistent with the theoretical results.

关键词： bistable laminated composite shell dynamic snap-through mode Hopf bifurcation chaotic dynamics vibration experiment

An extreme rainfall event in summer 2018 of Hami city in eastern Xinjiang, China

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Advances in Climate Change Research 2021年第6期12卷 795-803页

作者： ZOU Shan duan wei-li Nikolaos CHRISTIDIS Daniel NOVER ABUDUWAIli Jilili Philippe De MAEYER Tim Van De VOORDE College of Resource and Environment Sciences Xinjiang UniversityUrumqi830046China State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi830011China University of Chinese Academy of Sciences Beijing100049China Department of Geography Ghent UniversityGhent9000Belgium Met Office Hadley Centre ExeterEX13PBUK Department of Engineering University of California–MercedMercedCA95343USA Research Centre for Ecology and Environment of Central Asia Chinese Academy of SciencesUrumqi830011China Sino‒Belgian Joint Laboratory of Geo-Information Ghent9000Belgium Sino‒Belgian Joint Laboratory of Geo-Information Urumqi830011China

Extreme rainfall events are rare in inland arid regions, but have exhibited an increasing trend in recent years, causing many casualties and substantial socioeconomic losses. A series of heavy rains that began on July 31st, 2018, battered the Hami prefecture of eastern Xinjiang, China for four days. These rains sparked devastating floods, caused 20 deaths, eight missing, and the evacuation of about 5500 people. This study examines the extreme rainfall event in a historical context and explores the anthropogenic causes based on analysis of multiple datasets (i.e., the observed daily data, the global climate models (GCMs) from the Coupled Model Intercomparison Project Phase 5 (CMIP5), the NCEP/NCAR Reanalysis 1, and the satellite cloud data) and several statistical techniques. Results show that this extraordinarily heavy rainfall was due mainly to the abnormal weather system (e.g., the abnormal subtropical high) that transported abundant water vapor from the Indian Ocean and the East China Sea crossed the high mountains and formed extreme rainfall in Hami prefecture, causing the reservoir to break and form a flood event with treat loss, which is a typical example of a comprehensive analysis of the extreme rainfall event in summer in Northwest China. Also, the fraction of attributable risk (FAR) value was 1.00 when the 2018 July–August RX1day (11.52 mm) was marked as the threshold, supporting the claim of a significant anthropogenic influence on the risk of this extreme rainfall. The results offer insights into the variability of precipitation extremes in arid areas contributing to better manage water-related disasters.

关键词： Precipitation events Northwest China CMIP5 Fraction of attributable risk Attribution analysis

Tipping Point Detection Using Reservoir Computing

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Research 2024年第1期2023卷 779-790页

作者： Xin li Qunxi Zhu Chengli Zhao Xuzhe Qian Xue Zhang Xiaojun duan wei lin College of Science National University of Defense TechnologyChangshaHunan 410073China Research Institute of Intelligent Complex Systems and MOE Frontiers Center for Brain Science Fudan UniversityShanghai 200433China Shanghai Artificial Intelligence Laboratory Shanghai 200232China School of Mathematical Sciences SCMSSCAMand CCSBFudan UniversityShanghai 200433China

Detection in high fidelity of tipping points,the emergence of which is often induced by invisible changes in internal structures or/and external interferences,is paramountly beneficial to understanding and predicting complex dynamical systems(CDSs).Detection approaches,which have been fruitfully developed from several perspectives(e.g.,statistics,dynamics,and machine learning),have their own advantages but still encounter difficulties in the face of high-dimensional,fluctuating ***,using the reservoir computing(RC),a recently notable,resource-conserving machine learning method for reconstructing and predicting CDSs,we articulate a model-free framework to accomplish the detection only using the time series observationally recorded from the underlying unknown CDSs.

关键词： computing record ping

Insight into the development of electrolytes for aqueous zinc metal batteries from alkaline to neutral

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Chinese Chemical Letters 2024年第2期35卷 232-241页

作者： An duan Sha Luo wei Sun School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China

Aqueous zinc metal batteries are considered as promising candidates for next-generation electrochemical energy storage devices,especially for large-scale energy storage,due to the advantages of high-safety,high energy density and low *** the bridge connecting cathode and anode,electrolyte provides a realistic operating *** alkaline and neutral aqueous zinc metal batteries,issues associated with electrolyte and anode are still *** this review,we reveal the development and evolution of electrolytes for aqueous zinc metal batteries from alkaline to neutral via the description of fundamentals and challenges in terms of comparison and *** also elaborate the strategies in electrolytes regulation and highlight the basic roles and progresses in additives engineering.

关键词： Aqueous electrolytes Zinc metal batteries pH-dependent chemistry Electrolyte regulation Additives engineering

Two-dimensional ballistic transistors for advanced-node integrated circuits

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National Science Review 2024年第3期11卷 9-10页

作者： Jia li Xidong duan Hunan Provincial Key Laboratory of Two-Dimensional Materials State Key Laboratory for Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University

As the feature size of metal-oxide-semiconductor-field-effect-transistors(MOSFETs) in integrated circuits(ICs)is reduced to sub-10-nm, the traditional channel materials are plagued by enhanced scattering and short-cha... 详细信息

关键词： CONTACT

A justice and innovative way ahead of consumption-based emission accounting approach

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Science China Earth Sciences 2024年第10期67卷 2999-3010页

作者： Qun SHEN Hongbo duan Yun TANG linbing TANG li SHANG Xinyu DOU wei wei weiqiang CHEN Zhu liU State Key Laboratory of Low Carbon Catalysis and Carbon Dioxide Utilization CAS Key Laboratory of Low-Carbon Conversion Science&EngineeringShanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China School of Economics&Management University of Chinese Academy of SciencesBeijing 100190China Key Lab of Urban Environment and Health Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Department of Earth System Science Tsinghua UnivesityBeijing 100084China

Carbon emission accounting is an important basis for global climate *** on the consumption-based accounting(CBA)method,the characteristics of carbon flow between national,regional,and product processes could be more clearly ***,CBA is more conducive to clarifying the attribution of responsibilities between producers and consumers,with the principles of fairness and *** accounting for carbon emissions in typical countries from 1990 to 2019,we found that the CBA emissions are higher than the production-based accounting(PBA)emissions in major developed countries,while the results are reversed for developing *** the past 30 years,the CBA emissions in targeted developed countries generally have shown a downward trend,while in developing countries,they have shown an upward *** emissions in China have shown a continuous growth trend from 1990 to 2019,but the pace has slowed down significantly over the last ***,the embodied carbon intensity of China’s exports continues to decline,indicating that China is providing more green and low-carbon products to the *** the PV industry as an example,this study further reveals the contribution of specific product industries to the country’s carbon transfer through product carbon footprint *** order to provide a scientific basis for global mitigation and climate governance,it is urgent to innovate a scientific,practical,and standardized CBA technology system.

关键词： Consumption-based accounting Production-based accounting Carbon transfer Carbon footprint