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Catastrophe stability analysis for shallow tunnels considering settlement

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Journal of Central South University 2018年第4期25卷 949-960页

作者： huang xiao-lin ZHANG Rui School of Traffic and Transportation Engineering Changsha University of Science and Technology Department of Civil and Structural Engineering University of Sheffield

Limit analysis of the stability of geomechanical projects is one of the most difficult *** work investigates the influences of different parameters in NL failure strength on possible collapsing block shapes of single and twin shallow tunnels with considering the effects of surface *** bound solutions derived by functional catastrophe theory are used for describing the distinct characteristics of falling blocks of different parts in twin *** the analytical solutions of minimum supporting pressures in shallow tunnels are obtained by the help of the variational ***,the comparisons are made both in collapsed mechanism and stability factor with different *** to the numerical results in this work,the influences of different parameters on the size of collapsing block are presented in the tables and the limit supporting loads are illustrated in the form graphs that account for the surface settlement.

关键词： collapse mechanism twin shallow tunnel failure criterion surface settlement functional catastrophe theory

Field-assisted machining of difficult-to-machine materials

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International Journal of Extreme Manufacturing 2024年第3期6卷 39-89页

作者： Jianguo Zhang Zhengding Zheng Kai huang Chuangting lin Weiqi huang xiao Chen Junfeng xiao Jianfeng Xu State Key Laboratory of Intelligent Manufacturing Equipment and Technology School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China School of Mechanical Engineering Hubei University of TechnologyWuhan 430068People’s Republic of China

Difficult-to-machine materials (DMMs) are extensively applied in critical fields such as aviation,semiconductor,biomedicine,and other key fields due to their excellent material ***,traditional machining technologies often struggle to achieve ultra-precision with DMMs resulting from poor surface quality and low processing *** recent years,field-assisted machining (FAM) technology has emerged as a new generation of machining technology based on innovative principles such as laser heating,tool vibration,magnetic magnetization,and plasma modification,providing a new solution for improving the machinability of *** technology not only addresses these limitations of traditional machining methods,but also has become a hot topic of research in the domain of ultra-precision machining of *** new methods and principles have been introduced and investigated one after another,yet few studies have presented a comprehensive analysis and *** fill this gap and understand the development trend of FAM,this study provides an important overview of FAM,covering different assisted machining methods,application effects,mechanism analysis,and equipment *** current deficiencies and future challenges of FAM are summarized to lay the foundation for the further development of multi-field hybrid assisted and intelligent FAM technologies.

关键词： field-assisted machining difficult-to-machine materials materials removal mechanism surface integrity

手术治疗颈脊髓中央损伤综合征的预后及相关影响因素分析

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临床和实验医学杂志 2024年第16期23卷 1727-1731页

作者：冯鑫剑冯大雄黄小林黄学平泸州市人民医院神经脊柱外科四川泸州646000 西南医科大学附属医院脊柱外科四川泸州646000

目的分析手术治疗颈脊髓中央损伤综合征的预后及相关影响因素。方法回顾性选取2021年2月至2023年2月泸州市人民医院颈脊髓中央损伤综合征患者100例,依据手术预后分为预后良好组(n=70)、预后不良组(n=30)。统计分析两组患者的一般资料[... 详细信息

目的分析手术治疗颈脊髓中央损伤综合征的预后及相关影响因素。方法回顾性选取2021年2月至2023年2月泸州市人民医院颈脊髓中央损伤综合征患者100例,依据手术预后分为预后良好组(n=70)、预后不良组(n=30)。统计分析两组患者的一般资料[性别、年龄、致伤原因、受伤至手术时间、手术方式、入院和末次随访日本矫形学学会(JOA)评分、美国脊髓损伤协会(ASIA)神经功能评分、ASIA感觉、运动评分、手内肌肌力评分、住院时间、影像学资料等],多元回归分析一般资料与ASIA感觉、运动评分改善率、JOA评分改善率、预后良好的情况,并分析预后良好的相关影响因素、临界值。结果两组患者的性别构成比、病理征、椎间盘突出、后方韧带损伤、发育性颈椎管狭窄、手术方式、受伤至手术时间、住院时间、髓内高信号范围、脊髓受压最大处矢状径、脊髓最大受压程度(MSCC)之间比较,差异均无统计学意义(P>0.05);预后良好组患者的年龄、椎前高信号比率、后纵韧带骨化比率、椎管最狭窄处矢状径、MCC均明显低于预后不良组,差异均有统计学意义(P<0.05);预后良好组患者的入院时手内肌评分、ASIA运动评分和JOA评分均明显高于预后不良组,差异均有统计学意义(P<0.05)。预后良好的相关影响因素包括椎前高信号、椎管最狭窄处百分比、入院时手内肌评分、入院ASIA运动评分、入院JOA评分(P<0.05)。MCC预测手术治疗颈脊髓中央损伤综合征预后的灵敏度和特异度最高(P<0.05)。结论手术治疗颈脊髓中央损伤综合征的预后良好率高,MCC为主要相关影响因素。

关键词：颈脊髓中央损伤综合征手术预后影响因素

Demyelinating neuropathy in patients with hepatitis B virus: A case report

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World Journal of Clinical Cases 2024年第10期12卷 1766-1771页

作者： xiao-xiao Yan Jin huang Jing lin Department of Neurology The Third Affiliated Hospital of Wenzhou Medical UniversityRuian 325000Zhejiang ProvinceChina

BACKGROUND Hepatitis B rarely leads to demyelinating neuropathy,despite peripheral neuropathy being the first symptom of hepatitis B *** SUMMARY A 64-year-old man presented with sensorimotor symptoms in multiple peripheral *** testing showed that these symptoms were due to hepatitis *** undergoing treatment involving intravenous immunoglobulin and an antiviral agent,there was a notable improvement in his *** Although hepatitis B virus(HBV)infection is known to affect hepatocytes,it is crucial to recognize the range of additional manifestations linked to this *** connection between long-term HBV infection and demyelinating neuropathy has seldom been documented;hence,prompt diagnostic and treatment are *** patient's positive reaction to immunoglobulin seems to be associated with production of the antigen-antibody immune complex.

关键词： Hepatitis B virus infection Extrahepatic manifestations Demyelinating neuropathy Intravenous immunoglobulin Electroneuromyography Case report

Optimization of Generator Based on Gaussian Process Regression Model with Conditional Likelihood Lower Bound Search

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CES Transactions on Electrical Machines and Systems 2024年第1期8卷 32-42页

作者： xiao Liu Pingting lin Fan Bu Shaoling Zhuang Shoudao huang CES&IEEE the College of Electrical and Information Engineering Hunan UniversityChangsha 410082China CES

The noise that comes from finite element simulation often causes the model to fall into the local optimal solution and over fitting during optimization of ***,this paper proposes a Gaussian Process Regression(GPR)model based on Conditional Likelihood Lower Bound Search(CLLBS)to optimize the design of the generator,which can filter the noise in the data and search for global optimization by combining the Conditional Likelihood Lower Bound Search *** the efficiency optimization of 15 kW Permanent Magnet Synchronous Motor as an ***,this method uses the elementary effect analysis to choose the sensitive variables,combining the evolutionary algorithm to design the super Latin cube sampling plan;Then the generator-converter system is simulated by establishing a co-simulation platform to obtain data.A Gaussian process regression model combing the method of the conditional likelihood lower bound search is established,which combined the chi-square test to optimize the accuracy of the model ***,after the model reaches the accuracy,the Pareto frontier is obtained through the NSGA-II algorithm by considering the maximum output torque as a ***,the constrained optimization is transformed into an unconstrained optimizing problem by introducing maximum constrained improvement expectation(CEI)optimization method based on the re-interpolation model,which cross-validated the optimization results of the Gaussian process regression *** above method increase the efficiency of generator by 0.76%and 0.5%respectively;And this method can be used for rapid modeling and multi-objective optimization of generator systems.

关键词： Generator optimization Gaussian Process Regression(GPR) Conditional Likelihood Lower Bound Search(CLLBS) Constraint improvement expectation(CEI) Finite element calculation

Paleoenvironmental reconstruction and organic matter accumulation of the paleogene shahejie oil shale in the Zhanhua Sag, Bohai Bay Basin, Eastern China

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Petroleum Science 2024年第3期21卷 1552-1568页

作者： xiao-lin Wang xiao-Min Zhu Jin Lai Xing-Yue lin Xiang Wang Yu-Shan Du Chao huang Yu-Rui Zhu State Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing102249China College of Geosciences China University of Petroleum(Beijing)Beijing102249China Shengli Oilfield SINOPECDongying257000ShandongChina

The controlling factors of organic-rich shale accumulation is essential for the exploration and development of shale oil and gas *** sedimentary environment plays a vital role in the formation of organic-rich sediments in lacustrine *** article unravels the mineralogy,geochemistry,and paleoenvironmental evolution during the deposition of the Paleogene Shahejie Formation(Es_(3)^(L)).It discusses the effects of paleoclimate,paleosalinity,paleoredox conditions,paleowater depth,and paleoproductivity on organic matter(OM)***,the OM enrichment model was *** results show that the mineralogical compositions are mainly composed of calcite(avg.40.13%),quartz(avg.21.64%)and clay minerals(avg.24.07%),accompanied by dolomite(avg.7.07%),feldspar(avg.6.36%)and pyrite(avg.2.95%).The Es_(3)^(L) shale has a high abundance of OM,with total organic carbon(TOC)ranging from 1.07%to 5.12%.The organic matter type is mainly composed of type I-II_(1) kerogen,which is generally considered a good-quality source *** source of OM is a mixture of lower bacteria,algae,and *** the early sedimentary period,the paleoclimate was dry and cold,with high salinity,intense reducibility,and relatively low *** the late sedimentary period,the climate became warmer and more *** a result,the salinity decreased to a level that was suitable for biological reproduction,and productivity increased gradually due to the input of terrigenous *** and paleoclimate determined the environment of the sedimentary period,in addition,paleoproductivity and paleoredox condition indicated the formation and preservation conditions of *** warm and humid climate,brackish water,suitable reduction conditions and high productivity are the favorable conditions for the generation and preservation of organic *** research results may have implications for the genetic mechanisms of organic matter *** will provide theoret

关键词： Elemental geochemical Paleoenvironment Organic matter accumulation Paleogene shahejie formation Zhanhua Sag Bohai Bay Basin

Oxygen-assisted zinc recovery from electric arc furnace dust using magnesium chloride

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International Journal of Minerals,Metallurgy and Materials 2024年第10期31卷 2300-2311页

作者： Jingdong huang xiao Yang School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China School of Engineering Westlake UniversityHangzhou 310030China

Electric arc furnace(EAF)dust is an important secondary resource containing metals,such as zinc(Zn)and iron(Fe).Recover-ing Zn from EAF dust can contribute to resource recycling and reduce environmental ***,the high chemical stability of ZnFe_(2)O_(4)in EAF dust poses challenges to Zn *** address this issue,a facile approach that involves oxygen-assisted chlorination using molten MgCl_(2)is *** work focused on elucidating the role of O2 in the reaction between ZnFe_(2)O_(4)and molten MgCl_(2).The results demonstrate that MgCl_(2)effectively broke down the ZnFe_(2)O_(4)structure,and the high O2 atmosphere considerably promoted the sep-aration of Zn from other components in the form of ZnCl_(2).The presence of O2 facilitated the formation of MgFe_(2)O_(4),which stabilized Fe and prevented its ***,the excessive use of MgCl_(2)resulted in increased evaporation loss,and high temperatures pro-moted the rapid separation of *** on these findings,we successfully extracted ZnCl_(2)-enriched volatiles from practical EAF dust through oxygen-assisted *** optimized conditions,this method achieved exceptional Zn chlorination percentage of over 97%within a short period,while Fe chlorination remained below 1%.The resulting volatiles contained 85wt%of ZnCl_(2),which can be further processed to produce metallic *** findings offer guidance for the selective recovery of valuable metals,particularly from solid wastes such as EAF dust.

关键词： electric arc furnace dust zinc oxygen magnesium chloride chlorination

Atomscopic of ripple origins for two-dimensional monolayer transition metal dichalcogenides

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Nano Research 2024年第3期17卷 2136-2144页

作者： Haitao Yu Mingzi Sun xiao Wu Cheuk Hei Chan Bolong huang Zhong lin Wang CAS Center for Excellence in Nanoscience Beijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 100083China School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049China Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityKowloon 999077Hong KongChina Research Centre for Carbon-Strategic Catalysis The Hong Kong Polytechnic UniversityKowloon 999077Hong KongChina School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGeorgia 30332USA

During the development of ultrathin two-dimensional(2D)materials,the appearance of ripples has been widely ***,the formation mechanisms and their influences are still rarely investigated,especially their contributions to the electronic structures and optical *** compensate for the knowledge gap,we have carried out comprehensive theoretical studies on the monolayer WSe_(2) with a series of ripple structures from 0 to 12Åin different lattice *** sensitivity of the formation energy,band structures,electronic structures,and optical properties to the ripple structures have been performed systematically for the first *** formation of ripples in Armchair and zigzag simultaneously are more energetically favorable,leading to more flexible optimizations of the optoelectronic *** improved charge-locking effect and extension of absorption ranges indicate the significant role of ripple *** spontaneous formation of ripples is associated with orbital rearrangements and structural *** leads to the unique charge carrier correlate inversion between W-5d and Se-4p orbitals,resulting in the pinning of the Fermi *** work has supplied significant references to understand ultrathin 2D structures and benefit their future developments and applications in high-performance optoelectronic devices.

关键词： two-dimensional(2D)materials ripples strain effect charge carrier correlation inversion optoelectronic properties

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某化工厂通风防护设施的检测与评价

中国城乡企业卫生 2016年第4期31卷 118-120页

作者：黄晓林北京铁路局天津铁路疾病预防控制所职业病防制科天津300140

目的通过某化工厂职业病危害防护设施的现场检测,查找该厂职业病危害防护设施存在的不足。方法对该化工厂供氯车间、氯化车间的氯气浓度的职业接触限值、控制风速等通风设施进行分析和评价,对通风设施方面提出改进意见和建议。结果在通... 详细信息

目的通过某化工厂职业病危害防护设施的现场检测,查找该厂职业病危害防护设施存在的不足。方法对该化工厂供氯车间、氯化车间的氯气浓度的职业接触限值、控制风速等通风设施进行分析和评价,对通风设施方面提出改进意见和建议。结果在通风设施使用和关闭两种情况下,供氯车间通风设施对氯气浓度没有明显影响;氯化车间通风设施对氯气浓度有明显影响,两车间通风设备主要参数符合相应国家标准。结论该企业氯气危害控制在合理水平,但通风控制不明显。

关键词：通风设施防护效果职业病危害