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基于ABAQUS的咬合桩支护深基坑数值分析

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兰州理工大学学报 2024年第4期50卷 121-128页

作者：董和平董建华吴晓磊兰州理工大学土木工程学院甘肃兰州730050 兰州理工大学西部土木工程防灾减灾教育部工程研究中心甘肃兰州730050 中核四〇四有限公司甘肃嘉峪关735100

基于ABAQUS数值分析软件,利用刚度等效原则对咬合桩支护深基坑进行等效.对基坑开挖卸荷过程中坑底隆起变形、支护结构位移及支撑轴力变化进行分析,并与实际监测数据进行对比验证.研究结果表明:采用刚度等效原则进行咬合桩支护分析能够... 详细信息

基于ABAQUS数值分析软件,利用刚度等效原则对咬合桩支护深基坑进行等效.对基坑开挖卸荷过程中坑底隆起变形、支护结构位移及支撑轴力变化进行分析,并与实际监测数据进行对比验证.研究结果表明:采用刚度等效原则进行咬合桩支护分析能够反映基坑的变形特征,数值分析得出的支护结构和周围环境的变形结果与实际监测值具有良好的一致性,可作为基坑实际施工的指导.

关键词：基坑开挖咬合桩支护数值模拟坑底隆起变形

不同年龄段儿童动态脑电图痫样放电阳性率的变化规律研究

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中国妇幼保健 2024年第15期39卷 2834-2838页

作者：郑华燕伍晓蕾戴芬江山市人民医院(浙江大学医学院附属邵逸夫医院江山分院)脑电图室浙江江山324100

目的探讨不同年龄段儿童24 h动态脑电图痫样放电阳性率变化规律。方法选取2021年6月-2023年6月江山市人民医院小儿神经内科收治的100例癫痫患儿,按照年龄分为0.05)。各组患儿痫样放电总发生率比较差异有统计学意义(P<0.05),爆发性高... 详细信息

目的探讨不同年龄段儿童24 h动态脑电图痫样放电阳性率变化规律。方法选取2021年6月-2023年6月江山市人民医院小儿神经内科收治的100例癫痫患儿,按照年龄分为0.05)。各组患儿痫样放电总发生率比较差异有统计学意义(P<0.05),爆发性高波幅及痫样放电总发生率以13~18岁组最低。<1岁组、1~3岁组、4~6岁组、7~12岁组、13~18岁组患儿≥1次/月痫样放电发作频率分别为25.00%、55.00%、40.00%、65.00%、20.00%,13~18岁组患儿痫样放电发作频率明显降低(P<0.05)。各组患儿睡眠期痫样放电检出率最高(均P<0.05)。各组患儿非快速眼动睡眠(NREM)期中S1、S2期痫样放电指数明显高于S3、S4、快速眼动睡眠(REM)期。结论痫样放电阳性率以13~18岁组最低,痫样放电发作频率随着年龄增加而减少,各组患儿睡眠期痫样放电检出率均高于清醒期,且NREM睡眠中S1、S2期高于S3、S4及REM期。

关键词：儿童癫痫动态脑电图痫样放电阳性率

Identification of high oxygen-consuming substances in stormwater drainage systems illicitly connected with sewage system

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Journal of Environmental Sciences 2024年第4期138卷 132-140页

作者： Chen Xu Zuxin Xu Wenhai Chu Shanshan wu Rong xiao lei Su State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Ministry of Education Key Laboratory of Yangtze River Water Environment Tongji UniversityShanghai 200092China Guangzhou Resource Environmental Protection Technology Co. Ltd.Guangzhou 510030China

The dissolved oxygen content in water is an important indicator for assessing the quality of the water environment,and maintaining a certain amount of dissolved oxygen is essential for the healthy development of the ecological *** a water body is anoxic,the activity of anaerobic microorganisms increases and organic matter is decomposed to produce a large number of blackening and odorizing substances,resulting in black and odorous water bodies,which is a very common and typical phenomenon in ***,there is still a relatively universal occurrence of illicitly connected stormwater and sewage pipes in the urban drainage pipe network in China,which makes oxygen-consuming substances be directly discharged into rivers through stormwater pipes and consume the dissolved oxygen in the water bodies,resulting in an oxygen deficiency of the *** induces seasonal or year-round black and stink phenomena in urban ***,identifying high oxygen-consuming substances,which lays the foundation for the subsequent removal of oxygen-consuming substances,is *** a series of comparisons of water quality indicators and analysis of organic characteristics,it was found that the oxygen consumption capacity of domestic sewage was higher than that of industrial wastewater in the selected area of this study,and the oxygen-consuming substances of domestic sewage were small molecular amino *** comparing 20 conventional free amino acids,it was found that seven of them consumed oxygen easily,and compared with chemical oxygen consumption,biological oxygen consumption was in a leading position.

关键词： Urban drainage system Oxygen-consuming substances Domestic sewage Amino acid

Sodium butyrate alleviates fructose-induced non-alcoholic fatty liver disease by remodeling gut microbiota to promoteγ-amino butyric acid production

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Food Science and Human Wellness 2024年第2期13卷 961-971页

作者： Qu Chen lei wu Aijia Zhang Chen wu Liuping Cai Yingping xiao Yingdong Ni Key Laboratory of Animal Physiology and Biochemistry Ministry of Agriculture and Rural AffairsNanjing Agricultural UniversityNanjing 210095China State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products Institute of Agro-product Safety and NutritionZhejiang Academy of Agricultural SciencesHangzhou 310022China

Sodium butyrate(NaB)can regulate lipid metabolism and inhibit hepatic *** study aimed to investigate whether NaB can alleviate fructose-induced hepat ic steatosis via remodeling the gut microbiota and evaluate the anti-fatty liver *** results showed that NaB and NaB-remodeled gut microbiota significantly alleviated fructose-induced hepatic steatosis and increased plasma uric acid and fructose ***,both NaB and NaB-remodeled gut microbiota increased the abundance of Lactobacillus and altered the levels of plasma amino acids(upregulating gamma-amino butyric acid(GABA)and downregulating L-glutamic acid and L-arginine)in fructose-exposed *** correlation analysis showed that GABA levels positively correlated with Lactobacillus abundance,and increased GABA levels might promote the reduction of the hepatic triglyceride *** studies confirmed that GABA significantly reduced lipid deposition in mouse hepatocytes induced via fructose pretreatment in *** findings suggested that NaB could ameliorate fructose-induced hepatic steatosis by regulating gut microbiota.

关键词： Butyrate Fructose Gut microbiota Hepatic steatosis

Prediction of chemical short-range order in high-/medium-entropy alloys

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Journal of Materials Science & Technology 2024年第2期169卷 115-123页

作者： Pei-Yu Cao Jing Wang Ping Jiang Yun-Jiang Wang Fu-Ping Yuan xiao-lei wu State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of ScienceBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China

Chemical short-range orders(CSROs),as the built-in sub-nanoscale entities in a high-/medium-entropy alloy(H/MEA),have aroused an ever-increasing *** multi-principal elements in an H/MEA to form a complex concentrated solution,a variety of sub-systems of species exist to induce the metastable ordered compounds as candidates for ultimate *** issues remain pending on the origin of CSROs as to how to judge if CSRO will form in an H/MEA and particularly,what kind of CSROs would be stably produced if there were multiple ***,the first-principles method,along with the proposed local formation energy calculation in allusion to the atomic-scale chemical heterogeneities,is used to predict the CSRO formation based on the mechanical stability,thermodynamic formation energy,and electronic *** simulations are detailed in an equiatomic ternary VCoNi MEA with three kinds of potential compounds,i.e.,L1_(1),L1_(2),and B2,in the face-centered cubic *** turns out that L1_(1)is stable but hard to grow up so as to become the final CSRO.L1_(1)is further predicted as CSROs in CrCoNi,but unable to form in FeCoNi and CrMnFeCoNi *** predictions are consistent with the experimental *** findings shed light on understanding the formation of *** method is applicable to other H/MEAs to design and tailor CSROs by tuning chemical species/contents and thermal processing for high performance.

关键词： Short-range order High-entropy alloy Microstructure First-principles calculation Gibbs free energy Local electronic density of states

Polymeric hollow fiber membrane for cooling crystallization seeding:On the mechanism of induced nucleation based on thermal transfer Author links open overlay panel

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Particuology 2024年第8期91卷 38-49页

作者： Zeman He Shaofu Du Guanying Shao Peiyu Li lei Sheng Gaohong He xiaobin Jiang wu xiao State Key Laboratory of Fine Chemicals School of Chemical EngineeringEngineering Laboratory for Petrochemical Energy-efficient Separation Technology of Liaoning ProvinceDalian University of TechnologyDalian 116024China

Cooling crystallization is an important separation process and particuology technology that requires accurate nucleation control ***,we introduced the polymeric hollow fiber membrane with proper thermal properties as the effective nucleation induction interface during cooling *** heterogeneous nucleation control mechanism was introduced based on classical nucleation theory and the thermal transfer *** properties and the thermal conductivity of two kinds of polymeric membranes,polytetrafluoroethylene(PTFE)and polyethersulfone(PES),were measured and simulated with the developed *** two membranes possessed different nucleation induction periods,nucleation rates and crystallization performances,which validated that the hollow fiber membrane module could effectively accelerate the nucleation process compared to conventional cooling crystallization owing to the shorter nucleation induction period and the reduced solution surface *** to the higher hydrophobicity and the lower roughness of the membrane surface,the PTFE membrane possessed a more moderate performance in generating stable heterogeneous nucleation than the one of PES ***,the adjustable membrane property enabled the hollow fiber membrane-assisted cooling crystallization to possess the accurate nucleation control and desired terminal particle products.

关键词： Cooling crystallization Nucleation Particle process Hollow fiber membrane Induction period Process control

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应变诱导晶粒细化与伸长率

材料热处理学报 2005年第3期26卷 43-46页

作者：武晓雷中国科学院力学研究所非线性力学国家重点实验室北京100080

针对表面机械研磨处理导致的纳米化过程,分析了晶体结构与层错能(SFE)对纳米超细晶粒组织塑性变形及晶粒细化机制的影响。在低层错能、热力学亚稳态的纳米超细晶粒组织中,存在应变诱导的马氏体相变、孪生与位错分解等塑性变形方式,拉... 详细信息

针对表面机械研磨处理导致的纳米化过程,分析了晶体结构与层错能(SFE)对纳米超细晶粒组织塑性变形及晶粒细化机制的影响。在低层错能、热力学亚稳态的纳米超细晶粒组织中,存在应变诱导的马氏体相变、孪生与位错分解等塑性变形方式,拉伸变形时发生相变诱发塑性(TRIP)效应,指出TRIP效应可以是提高拉伸伸长率的机制。

关键词：纳米金属晶粒细化塑性变形拉伸伸长率表面机械研磨处理

An improved bound on accelerated light dark matter

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Science China(Physics,Mechanics & Astronomy) 2024年第2期67卷 105-118页

作者： Liangliang Su lei wu Bin Zhu Department of Physics and Institute of Theoretical Physics Nanjing Normal UniversityNanjing 210023China School of Physics Yantai UniversityYantai 264005China

Light(sub-GeV)dark matter has gained increasing interest in terms of direct *** dark matter is a promising candidate that can generate detectable nuclear recoil energy within the sub-GeV *** of the large kinetic energy,its interactions with the nucleus are predominantly governed by inelastic scattering,including quasi-elastic and deep inelastic *** this work,we calculated the inelastic effects in dark matter-Earth scattering mediated by a vector *** analysis revealed that the impact of inelastic scattering relies on the mediator mass and the kinetic energy spectrum of dark *** results exhibited considerable disparity:the upper bounds of the exclusion limit for the spin-independent cross-section between accelerated dark matter and nuclei via a heavy mediator differ by several tens of times when inelastic scattering is considered.

关键词： accelerated dark matter inelastic scattering direct detection experiment

A study on the temperature sensitivity of NMR porosity in porous media based on the intensity of magnetization Dedicated to the special issue “Magnetic Resonance in Porous Media”

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Magnetic Resonance Letters 2024年第1期4卷 28-39页

作者： Lu Zhang Lizhi xiao Wensheng wu Guangzhi Liao Yan Zhang Sihui Luo Xinglong lei National Key Laboratory of Petroleum Resources and Engineering China University of PetroleumBeijing102249China College of Geophysics China University of PetroleumBeijing102249China PetroChina Huabei Oilfield Company China National Petroleum CorporationRenqiu062552China

The measurement of nuclear magnetic resonance(NMR)porosity is affected by *** considering the impact of NMR logging tools,this phenomenon is mainly caused by variations in magnetization intensity of the measured system due to temperature fluctuations and difference between the temperature of the porous medium and calibration *** this study,the effect of temperature was explained based on the thermodynamic theory,and the rules of NMR porosity responses to temperature changes were identified through core physics *** addition,a method for correcting the influence of temperature on NMR porosity measurement was proposed,and the possible factors that may affect its application were also discussed.

关键词： NMR porosity Temperature Porous media Intensity of magnetization