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Finite Element Simulations of the Localized Failure and Fracture Propagation in Cohesive Materials with Friction

Computer Modeling in Engineering & Sciences 2024年第7期140卷 997-1015页

作者： Chengbao Hu Shilin gong Bin Chen Zhongling Zong Xingwang bao Xiaojian Ru Department of Civil Engineering Hangzhou City UniversityHangzhou310015China Zhejiang Engineering Research Center of Intelligent Urban Infrastructure Hangzhou310015China Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province Hangzhou310015China School of Civil and Ocean Engineering Jiangsu Ocean UniversityLianyungang222005China Institute of Municipal Engineering Hangzhou Shangcheng District Municipal Engineering Group Co.Ltd.Hangzhou310016China

Strain localization frequently occurs in cohesive materials with friction(e.g.,composites,soils,rocks)and is widely recognized as a fundamental cause of progressive structural failure.Nonetheless,achieving high-fidelity simulation for this issue,particularly concerning strong discontinuities and tension-compression-shear behaviors within localized zones,remains significantly constrained.In response,this study introduces an integrated algorithmwithin the finite element framework,merging a coupled cohesive zone model(CZM)with the nonlinear augmented finite elementmethod(N-AFEM).The coupledCZMcomprehensively describes tension-compression and compressionshear failure behaviors in cohesive,frictional materials,while the N-AFEM allows nonlinear coupled intraelement discontinuities without necessitating extra nodes or nodal DoFs.Following CZM validation using existing experimental data,this integrated algorithm was utilized to analyze soil slope failure mechanisms involving a specific tensile strength and to assess the impact of mechanical parameters(e.g.,tensile strength,weighting factor,modulus)in soils.

关键词： FEM analysis strong discontinuity nonlinear soil rupture cohesive zone model tension-compression-shear coupling

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Recycling of spent lithium-ion batteries to resynthesize high-performance cathode materials for sodium-ion storage

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Tungsten 2024年第3期6卷 574-584页

作者： Hai-Qiang gong Xing-Yuan Wang Long Ye bao Zhang Xing Ou National Engineering Laboratory for High-Efficiency Recovery of Refractory Nonferrous Metals School of Metallurgy and Environment Central South University

The spent lithium-ion batteries recovery has been brought into focus widely for its environmental imperatives and potential profits from the metal components,such as lithium,cobalt,nickel and manganese.However,the weaker pollution and fewer profits of LiMn2O4cathode dispel the enthusiasm and responsibility of industry companies.Thus,a simplified and efncient method to regenerate the sodium-ion cathode materials and separate Li from spent LiMn2O4materials for the profit improvement is proposed.In detail,adjusting the parameters of carbothermal reduction process appropriately,the LiMn2O4spinel structure is destroyed within a short period time and transformed into simple metal oxide.As anticipated,nearly 95 wt.%lithium can be obtained and recovered during the water leaching,while 99 wt.% of manganese can be extracted in acid solution.Noted that the leaching residue can return to the carbothermic reduction,leading to a closed-loop economic recycling process.The regenerated Na0.67Ni0.3Mn0.7O2cathode displays excellent electrochemical performance with superior cycling stability(the initial capacity reaches 95.9 mAh·g-1,and the retention rate reached 98.3% after 100 cycles at 1 C).The delicate strategy of sodium-ion cathode material regenerated from spent LiMn2O4aims to realize lithium separation and material utilization of manganese simultaneously,providing the instructive suggestion to rise up the recycling profits of spent batteries.

关键词： Manganese Spent battery LiMn 2 O 4 cathode Recycling Regenerated Na 0.67 Ni 0.3 Mn 0.7 O 2 Sodium-ion storage

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Engineering of oxygen vacancy and bismuth cluster assisted ultrathin Bi_(12)O_(17)Cl_(2)nanosheets with efficient and selective photoreduction of CO_(2)to CO

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Carbon Energy 2024年第4期6卷 1-11页

作者： Meili Guan Ni Lu Xuan Zhang Qiuwan Wang Jian bao Guiye Chen Hao Yu Huaming Li Jiexiang Xia Xuezhong gong College of Chemical and Biological Engineering Shandong University of Science and TechnologyQingdaoShandongChina Institute for Energy Research Jiangsu UniversityZhenjiangJiangsuChina National Center of International Joint Research for Hybrid Materials Technology Institute of Hybrid MaterialsCollege of Materials Science andEngineeringNational Base of International Science and Technology Cooperation on Hybrid MaterialsQingdao UniversityQingdaoShandongChina

The photocatalytic conversion of CO_(2)into solar‐powered fuels is viewed as a forward‐looking strategy to address energy scarcity and global warming.This work demonstrated the selective photoreduction of CO_(2)to CO using ultrathin Bi_(12)O_(17)Cl_(2)nanosheets decorated with hydrothermally synthesized bismuth clusters and oxygen vacancies(OVs).The characterizations revealed that the coexistences of OVs and Bi clusters generated in situ contributed to the high efficiency of CO_(2)–CO conversion(64.3μmol g^(−1)h^(−1))and perfect selectivity.The OVs on the facet(001)of the ultrathin Bi_(12)O_(17)Cl_(2)nanosheets serve as sites for CO_(2)adsorption and activation sites,capturing photoexcited electrons and prolonging light absorption due to defect states.In addition,the Bi‐cluster generated in situ offers the ability to trap holes and the surface plasmonic resonance effect.This study offers great potential for the construction of semiconductor hybrids as multiphotocatalysts,capable of being used for the elimination and conversion of CO_(2)in terms of energy and environment.

关键词： Bi cluster Bi_(12)O_(17)Cl_(2)nanosheet oxygen vacancy photocatalytic CO_(2)reduction

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Pan-African metamorphism and magmatism in the Prydz Belt,East Antarctica:a geochronological perspective

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Advances in Polar Science 2024年第2期35卷 143-156页

作者： bao Hong WANG Wei-(RZ) LIU Xinshu ZHAO Yue gong Tingnan LIU Xiaochun CUI Ying TIAN Zuolin Institute of Geomechanics Chinese Academy of Geological SciencesBeijing 100081China Key Laboratory of Paleomagnetism and Tectonic Reconstruction Ministry of Natural ResourcesBeijing 100081China China University of Geosciences(Beijing) Beijing 100081China MOE Key Laboratory of Orogenic Belt and Crustal Evolution School of Earth and Space SciencesPeking UniversityBeijing 100871China Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China

The Prydz Belt in East Antarctica underwent extensive reworking during the late Neoprotertozoic–early Paleozoic Pan-African orogeny,which is characterized by granulite facies,clockwise P–T paths,and high dT/dP values.This study compiles the existing age and composition data of zircon and monazite from metamorphic rocks and links their key characteristics to the metamorphic evolution of the Prydz Belt.The frequency of zircon U–Pb ages starts to increase noticeably from~555 Ma,peaking between 530 Ma and 520 Ma,followed by a dramatic decline after 520 Ma.High Th/U values(>0.1)of zircon are observed from~545 Ma,displaying a noticeable increasing trend in Th/U values before a rapid decline from~520 Ma.The frequency of monazite ages progressively increases from~540 Ma,reaching its peak at 515 Ma,and then rapidly decreases after 490 Ma.Combined with the crystallization behaviors of zircon and monazite,this study suggests that the systematic changes in Th/U values of zircon after 545 Ma indicate a transition in the thermal regime of the Prydz Belt towards the cooling stage.Abundant growth of zircon and monazite corresponds to the post-peak cooling process,while the crystallization peak of monazite lags behind that of zircon by~5–15 Ma,which indicates a relatively low cooling rate.Though the granitic intrusions accompanied the entire metamorphic evolution,the majority of them are younger than 520 Ma.The results suggest that the Pan-African event likely peaked at~555–545 Ma and gradually cooled to near-solidus conditions at~520–510 Ma,with a relatively slow average cooling process.

关键词： East Antarctica Prydz Belt Pan-African orogeny zircon monazite U–Pb dating

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Cell softness reveals tumorigenic potential via ITGB8/AKT/glycolysis signaling in a mice model of orthotopic bladder cancer

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Chinese Medical Journal 2024年第2期137卷 209-221页

作者： Shi Qiu Yaqi Qiu Linghui Deng Ling Nie Liming Ge Xiaonan Zheng Di Jin Kun Jin Xianghong Zhou Xingyang Su Boyu Cai Jiakun Li Xiang Tu Lina gong Liangren Liu Zhenhua Liu Yige bao Jianzhong Ai Tianhai Lin Lu Yang Qiang Wei Department of Urology Institute of UrologyNational Clinical Research Center for Geriatrics and Center of Biomedical Big DataWest China Hospital of Sichuan UniversityChengduSichuan 610041China Department of Molecular Oncology Institute of Oncology Research(IOR)Oncology Institute of Southern Switzerland(IOSI)Bellinzona 6500Switzerland Department of Science and Drug Technology University of TurinTurinItaly National Clinical Research Center of Geriatrics The Center of Gerontology and GeriatricsWest China HospitalSichuan UniversityChengduSichuan 610000China Department of Pathology West China HospitalSichuan UniversityChengduSichuan 610041China Department of Pharmaceutics and Bioengineering School of Chemical EngineeringSichuan UniversityChengduSichuan 610000China

Background:Bladder cancer,characterized by a high potential of tumor recurrence,has high lifelong monitoring and treatment costs.To date,tumor cells with intrinsic softness have been identified to function as cancer stem cells in several cancer types.Nonetheless,the existence of soft tumor cells in bladder tumors remains elusive.Thus,our study aimed to develop a microbarrier microfluidic chip to efficiently isolate deformable tumor cells from distinct types of bladder cancer cells.Methods:The stiffness of bladder cancer cells was determined by atomic force microscopy(AFM).The modified microfluidic chip was utilized to separate soft cells,and the 3D Matrigel culture system was to maintain the softness of tumor cells.Expression patterns of integrinβ8(ITGB8),protein kinase B(AKT),and mammalian target of rapamycin(mTOR)were determined by Western blotting.Double immunostaining was conducted to examine the interaction between F-actin and tripartite motif containing 59(TRIM59).The stem-cell-like characteristics of soft cells were explored by colony formation assay and in vivo studies upon xenografted tumor models.Results:Using our newly designed microfluidic approach,we identified a small fraction of soft tumor cells in bladder cancer cells.More importantly,the existence of soft tumor cells was confirmed in clinical human bladder cancer specimens,in which the number of soft tumor cells was associated with tumor relapse.Furthermore,we demonstrated that the biomechanical stimuli arising from 3D Matrigel activated the F-actin/ITGB8/TRIM59/AKT/mTOR/glycolysis pathways to enhance the softness and tumorigenic capacity of tumor cells.Simultaneously,we detected a remarkable up-regulation in ITGB8,TRIM59,and phospho-AKT in clinical bladder recurrent tumors compared with their non-recurrent counterparts.Conclusions:The ITGB8/TRIM59/AKT/mTOR/glycolysis axis plays a crucial role in modulating tumor softness and stemness.Meanwhile,the soft tumor cells become more sensitive to chemotherapy after stiffening,that offers new insights fo

关键词： Soft tumor cells 3D Matrigel Stemness Non-muscle invasive bladder neoplasms Microfluidic analytical techniques

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Dalbergia odorifera Essential Oil Protects against Myocardial Ischemia through Upregulating Nrf2 and Inhibiting Caspase Signaling Pathways in Isoproterenol-Induced Rats

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World Journal of Traditional Chinese Medicine 2023年第3期9卷 338-347页

作者： Can-Hong Wang bao gong Hui Meng Yu-Lan Wu Xiang-Sheng Zhao Jian-He Wei Hainan Provincial Key Laboratory of Resources Conservation and Development of Southern Medicine Hainan Branch of the Institute of Medicinal Plant DevelopmentChinese Academy of Medical Sciences and Peking Union Medical CollegeHaikouChina Key Laboratory of State Administration of Traditional Chinese Medicine for Agarwood Sustainable Utilization Hainan Branch of the Institute of Medicinal Plant DevelopmentChinese Academy of Medical Sciences and Peking Union Medical CollegeHaikouChina Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine Institute of Medicinal Plant DevelopmentChinese Academy of Medical Sciences and Peking Union Medical College Ministry of Education and National Engineering Laboratory for Breeding of Endangered Medicinal Materials Institute of Medicinal Plant DevelopmentChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijingChina

Objective:Dalbergia odorifera has long been used as a Chinese herbal medicine for the treatment of cardiovascular and cerebrovascular diseases.This study aimed to determine the potential myocardial protective effect and possible mechanism of action of D.odor ife ra essential oil(DOEO).Materials and Methods:The essential oil of D.odorifera was extracted by hydrodistillation.The cardioprotective effects of DOEO were examined by histopathological observation,myocardial enzyme detection,peroxidation,anti-oxidant level detection,and related protein expression.The compounds in the blood were identified by gas chromatography-mass spectrometry.Results:These results showed that DOEO had significant myocardial cell protection,with IC50 values ranging from 17.64 to 24.78μg/mL in vitro.Compared to the myocardial ischemia group,the DOEO pretreatment groups had lower levels of myocardial injury,creatinine kinase,lactate dehydrogenase,alanine transaminase,aspartate transaminase,hydrogen peroxide,and nitric oxide,and higher levels of glutathione and superoxide dismutase.In addition,DOEO pretreatment significantly increased Na+-K+-ATPase and Ca2+-ATPase levels.Moreove r,immunohistochemical e xperiments showed that DOEO remarkably increased the protein levels of NF-E2-related nuclear factor 2(Nrf2)and heme oxygenase-1(HO-1)and reduced the expression of apoptotic caspases,including caspase 3 and caspase 9.The main components of the blood were transnerolidol and nerolidol oxide.Overall,the study showed that DOEO displayed myocardial protection by upregulating the NF-E2-related nuclear factor-antioxidant response element(Nrf2-ARE)and caspase pathways.DOEO has a therapeutic effect on MI by inhibiting the oxidant and apoptotic effects.Conclusions:D.odorifera may be a potential candidate drug for treating myocardial ischemic injury.

关键词： Anti-apoptosis Anti-oxidation Dalbergia odorifera essential oil Isoproterenol Myocardial ischemia

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两性纤维素多孔凝胶球的制备及其动态吸附性能

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纺织学报 2024年第5期45卷 102-112页

作者：郑康龚文丽鲍杰刘琳浙江理工大学材料科学与工程学院浙江杭州310018

用于废水处理的多孔凝胶球存在制备工艺繁琐,吸附种类单一,吸附效率低等不足;为提高多孔凝胶球的性能,采用滴入相分离、酯化反应引入羧基及希夫碱反应引入氨基的化学改性方法,制备得到兼具高孔隙率、高力学性能和羧基/氨基活性基团的两... 详细信息

用于废水处理的多孔凝胶球存在制备工艺繁琐,吸附种类单一,吸附效率低等不足;为提高多孔凝胶球的性能,采用滴入相分离、酯化反应引入羧基及希夫碱反应引入氨基的化学改性方法,制备得到兼具高孔隙率、高力学性能和羧基/氨基活性基团的两性纤维素多孔凝胶球(ACM),并构建动态吸附柱装置以探究不同条件下ACM对染料的动态吸附性能。结果表明:通过降低染料初始质量浓度,增加填料高度和减慢进液流速的方式可有效提高吸附柱的动态吸附效率;0.8 g的ACM可处理7.5 L含染料的废水;对ACM的动态吸附过程进行动态模型拟合,其与Thomas和Yoon-Nelson模型的拟合程度高,表明吸附是均匀表面的单分子层吸附,动态吸附过程中存在2个或多个速率控制步骤,内部扩散和外部扩散均不是吸附过程中的限速步骤。基于ACM优异的分级孔结构、丰富的活性位点和低传质阻力等优势,认为ACM展现出良好的动态吸附性能,在印染废水处理方面有较大应用潜力。

关键词：纤维素两性凝胶球吸附分离阴阳离子染料动态吸附性能印染废水废水处理

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时效时间对固溶态及冷变形态钴基合金显微组织和力学性能影响

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中国有色金属学报 2024年第1期34卷 184-195页

作者：王中琳龚志华李权包汉生内蒙古科技大学材料与冶金学院包头014010 钢铁研究总院特殊钢研究院北京100081

对固溶态及冷变形态的两种钴基合金L605、L605Mo进行600℃不同时间的时效处理,采用扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)及力学性能测试等方法研究时效时间对合金显微组织与力学性能的影响,并分析了冷变形及Mo元素对时效行为... 详细信息

对固溶态及冷变形态的两种钴基合金L605、L605Mo进行600℃不同时间的时效处理,采用扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)及力学性能测试等方法研究时效时间对合金显微组织与力学性能的影响,并分析了冷变形及Mo元素对时效行为的影响。结果表明:经过冷变形的合金经600℃时效后,强度、硬度提高,塑性韧性下降;而固溶态合金经时效后,力学性能变化不明显,其中,抗拉强度最高的合金为时效12 h的s25-13合金。时效初期碳化物析出及层错形成使合金强度提高,但随着时效时间的延长,冷变形形成的具有强化作用的变形带在时效过程中退化会使合金强度减小。M_(6)C含量随时效时间延长而不断增加,冷变形促进M_(23)C_(6)及M_(6)C析出使合金的时效强化效果更加显著。Mo能降低层错能,促进时效过程中M_(23)C_(6)、M_(6)C和层错的形成以及层错的交割,从而提高合金的强度。因此,添加Mo的合金经时效处理后强度、硬度均高于未添加Mo的合金。

关键词：钴基合金时效处理层错 Mo 冷变形

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数字经济与新型工业化深度融合发展研究

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亚太经济 2024年第2期 1-8页

作者：任保平巩羽浩南京大学数字经济与管理学院苏州215163

数字经济背景下,新型工业化被赋予更深刻的内涵,二者深度融合发展为中国式现代化构筑强大的物质技术基础,助力发展新质生产力。数字产业化强化科技自主创新,可破除新型工业化自主创新瓶颈;产业数字化促进产业全链条现代化,可解决新型工... 详细信息

数字经济背景下,新型工业化被赋予更深刻的内涵,二者深度融合发展为中国式现代化构筑强大的物质技术基础,助力发展新质生产力。数字产业化强化科技自主创新,可破除新型工业化自主创新瓶颈;产业数字化促进产业全链条现代化,可解决新型工业化效率优化困境;数字化转型利好绿色低碳生产,可完善新型工业化绿色体系建设;数字化市场以新型工业化为着力点,可助力构建新发展格局。数字经济与新型工业化深度融合的实现路径:以数字平台推动企业数字化转型,夯实数字经济与新型工业化融合的基础;以数字生态优化产业生态系统,扩大数字经济与新型工业化融合的广度;以数实融合打造新型实体经济,强化数字经济与新型工业化融合的深度。

关键词：数字经济新型工业化融合发展

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大鲵骨酸溶性和胃蛋白酶溶性胶原蛋白的提取与表征

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中国食品学报 2024年第3期24卷 268-275页

作者：宫萱包建强黄可承陈彦婕唐嘉诚上海海洋大学食品学院上海201306

大鲵为一种珍贵的两栖动物,营养丰富。为了充分且有效利用其加工副产物,分离并表征了来自大鲵骨的酸溶性胶原蛋白(ASC)和胃蛋白酶溶解性胶原蛋白(PSC)。大鲵骨ASC和PSC的产率分别为10.71%和13.11%。通过傅里叶红外光谱揭示胶原蛋白稳定... 详细信息

大鲵为一种珍贵的两栖动物,营养丰富。为了充分且有效利用其加工副产物,分离并表征了来自大鲵骨的酸溶性胶原蛋白(ASC)和胃蛋白酶溶解性胶原蛋白(PSC)。大鲵骨ASC和PSC的产率分别为10.71%和13.11%。通过傅里叶红外光谱揭示胶原蛋白稳定的三螺旋结构。SDS-PAGE电泳图显示两个样品均为I型胶原蛋白,同时具有高水平的亚氨基酸(179~187/1000个残基)。样品在pH 6时溶解度最高。热变性温度(45.78~46.51℃)显著高于海洋和淡水鱼物种。在SEM下,胶原蛋白显示出致密的片状和不规则的孔洞状。这些结果表明大鲵骨胶原蛋白特性与哺乳动物胶原蛋白相似,具有成为其替代品的潜力,为其后续的研究和开发利用提供了基础数据。

关键词：大鲵骨胶原蛋白提取表征

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