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Multilevel Micro Structures of the Clam Make the Sealing Even Tighter

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Journal of Bionic Engineering 2024年第3期21卷 1442-1452页

作者： Daobing Chen Xiaolong Zhang Junqiu Zhang Zhiwu Han Ruteng Wang Zhen Lin Yifeng Lei Longjian Xue Sheng Liu The Institute of Technological science Wuhan UniversityWuhan430072China School of Power and Mechanical Engineering Wuhan UniversityWuhan430072China The Key laboratory of Bionic Engineering(Ministry of Education) Jilin UniversityChangchun130022China Institute of Structured and Architected Materials Liaoning Academy of MaterialsShenyang110167China

Excellent fluid sealing performance is crucial to ensuring the safety of important equipment,especially in aerospace field,such as space capsule and fuel *** frequently opening and closing of the sealing devices is particularly *** by this background,clams(Mactra chinensis)which can open and close their double shells with superior sealing performance,are studied in this ***,we show that the clam’s sealing ability is the result of its unique multilevel intermeshing microstructures,including hinge teeth and *** microstructures,which resemble gear teeth,engage with each other when the shell closes,forming a tight structure that prevents the infiltration of water from the ***,the presence of micron blocks prevents the penetration of finer *** simulation results of the bionic end seal components show that the multilevel microstructure has a superior sealing *** research is expected to be applied to undersea vehicles that require frequent door opening and closing.

关键词： Multilevel micro structures Opening and closing components Clam Sealing Bionic

Summer extreme precipitation patterns and synoptic-scale circulation precursors over the Tibetan Plateau

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science China Earth sciences 2024年第5期67卷 1625-1638页

作者： Zhiyuan DING Yao HA Zhong ZHONG College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China Key laboratory for Virtual Geographic Environment School of Geography ScienceNanjing Normal UniversityNanjing 210023China Jiangsu Collaborative Innovation Center for Climate Change School of Atmospheric SciencesNanjing UniversityNanjing 210023China

In the context of global warming,the extreme summer precipitation over the Tibetan Plateau(TP)has changed *** this study,the summer(June–August)extreme precipitation on the TP was classified into three spatial types by applying the K-means clustering method to the Third Pole Region long time-series high-resolution(1/30°)precipitation dataset(TPHi Pr,1979–2020).The characteristics of the circulation anomalies and precursors corresponding to the extreme precipitation on the TP in summer during 1979–2020 were *** results showed that the summer extreme precipitation of the TP can be categorized into northwestern(NW),southeastern(SE),and southern Himalayan(HS)types based on extreme precipitation *** NW and SE types are mainly influenced by anomalous signals in the mid-to-high latitude regions upstream of them,whereas the HS type is controlled by the localized subtropical anomalous *** the 8th day before the onset of the NW type,an anomalous cyclone was observed in the western Atlantic Ocean(60°W,50°N),which triggered the west-to-east quasi-latitudinal propagation of Rossby *** the onset day of the NW type,the upper troposphere showed positive-negative-positive geopotential height anomalies along the latitudinal 40°N from the Caspian Sea,the western part of Xinjiang,to the northeastern *** entered from the Arabian Sea along the southeastern edge of the anomalous cyclone on the southwestern TP and converged in the northwestern *** to the NW type,the precursors of the SE type appeared at higher latitudes and were more *** the 8th day before the onset of the SE type,an anomalous cyclone occurred near Greenland(60°W,70°N)and excited Rossby waves propagating *** the onset day of the SE type,the upper troposphere showed negative-positive-negative geopotential height anomalies across Eurasia from the Ural Mountains and the Iranian Plateau to the northern TP in the northwest-southeast directi

关键词： Tibetan Plateau Summer extreme precipitation Atmospheric circulation anomaly Precursor Teleconnection wave train

Rogue waves for the(2+1)-dimensional Myrzakulov–Lakshmanan-Ⅳ equation on a periodic background

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Communications in Theoretical Physics 2024年第4期76卷 32-42页

作者： Xiao-Hui Wang Zhaqilao College of Mathematics science Inner Mongolia Normal UniversityHohhot 010022China laboratory of Infinite-dimensional Hamiltonian System and Its algorithm Application Hohhot 010022China Center for Applied Mathematical science Inner MongoliaHohhot 010022China

In this paper, the rogue wave solutions of the(2+1)-dimensional Myrzakulov–Lakshmanan(ML)-Ⅳ equation, which is described by five component nonlinear evolution equations, are studied on a periodic background. By using the Jacobian elliptic function expansion method, the Darboux transformation(DT) method and the nonlinearization of the Lax pair, two kinds of rogue wave solutions which are expressed by Jacobian elliptic functions dn and cn, are *** relationship between these five kinds of potential is summarized systematically. Firstly, the periodic rogue wave solution of one potential is obtained, and then the periodic rogue wave solutions of the other four potentials are obtained directly. The solutions we find present the dynamic phenomena of higher-order nonlinear wave equations.

关键词： rogue waves on a periodic background (2+1)-dimensional Myrzakulov-Lakshmanan-IV equation Darboux transformation Jacobian elliptic function

Analytical Solution for the Reissner-Sagoci Problem of a Piezoelectric Half-Space

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Acta Mechanica Solida Sinica 2024年第3期37卷 363-370页

作者： Keqiang Hu Cun-Fa Gao Zengtao Chen Zheng Zhong State Key laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing210016China Department of Mechanical Engineering University of AlbertaEdmontonABT6G 1H9Canada School of science Harbin Institute of TechnologyShenzhen518055China

In this paper,a transversely isotropic piezoelectric half-space with the isotropy axis parallel to the z-axis is considered under rotation on a rigid circular disk bonded to the surface of the piezoelectric *** is a type of Reissner-Sagoci mixed boundary value *** utilizing the Hankel transform,the mixed boundary value problem is simplified into solving a pair of dual integral ***-field analytical expressions for displacement,stresses,and electric displacement inside the half-space are *** shear stresses and electric displacement on the surface are found to be singular at the edge of the rigid circular disk,and the stress intensity factors and electric displacement intensity factor are *** results show that material properties and geometric size have significant effects on displacement,shear stresses,and electric displacement.

关键词： Piezoelectric half-space Circular disk Reissner-Sagoci problem Stress intensity factor Electric displacement intensity factor

Sesamin is an effective spleen tyrosine kinase inhibitor against IgE-mediated food allergy in computational， cell-based and animal studies

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Food science and Human Wellness 2024年

作者： Yu Li Xuerui Chen Longhua Xu Xintong Tan Dapeng Li Dongxiao Sun-Waterhouse Feng Li School of Chemical sciences The University of Auckland Key laboratory of Food Nutrition and Human Health in Universities of Shandong College of Food science and Engineering Shandong Agricultural University

Food allergy has become a global concern. Spleen tyrosine kinase (SYK) inhibitors are promising therapeutics against allergic disorders. In this study， a total of 300 natural phenolic compounds were firstly subjected to virtual screening. Sesamin and its metabolites， sesamin monocatechol (SC-1) and sesamin dicatechol (SC-2)， were identified as potential SYK inhibitors， showing high binding affinity and inhibition efficiency towards SYK. Compared with R406 (a traditional SYK inhibitor)， sesamin， SC-1， and SC-2 had lower binding energy and inhibition constant (Ki) during molecular docking， exhibited higher bioavailability， safety， metabolism/clearance rate， and distribution uniformity ADMET predictions， and showed high stability in occupying the ATP-binding pocket of SYK during molecular dynamics simulations. In anti-dinitrophenyl-immunoglobulin E (Anti-DNP-IgE)/dinitrophenyl-human serum albumin (DNP-HSA)-stimulated rat basophilic leukemia (RBL-2H3) cells， sesamin in the concentration range of (5 – 80) μmol/L influenced significantly the degranulation and cytokine release， with 54.00% inhibition against β-hexosaminidase release and 58.45% decrease in histamine. In BALB/c mice， sesamin could ameliorate Anti-DNP-IgE/DNP-HSA-induced passive cutaneous anaphylaxis and ovalbumin (OVA)-induced active systemic anaphylaxis reactions， reduce the levels of allergic mediators (immunoglobulins and pro-inflammatory cytokines)， partially correct the imbalance of T helper (Th) cells differentiation in the spleen， and inhibit the phosphorylation of SYK and its downstream signaling proteins， including p38 mitogen-activated protein kinases (p38 MAPK)， extracellular signal-regulated kinases (ERK)， and p65 nuclear factor-κB (p65 NF-κB) in the spleen. Thus， sesamin may be a safe and versatile SYK inhibitor that can alleviate IgE-mediated food allergies.

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水锌离子电池用钒基正极材料的低电流密度稳定性

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science Bulletin 2024年第6期69卷 833-845页

作者：窦欣月谢雪芳梁叔方国赵 School of Materials science and Engineering Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan ProvinceCentral South UniversityChangsha 410083China College of Physical science and Technology Xinjiang UniversityUrumqi 830017China

Vanadium-based cathodes have received widespread attention in the field of aqueous zinc-ion batteries,presenting a promising prospect for stationary energy storage ***,the rapid capacity decay at low current densities has hampered their *** particular,capacity stability at low current densities is a requisite in numerous practical applications,typically encompassing peak load regulation of the electricity grid,household energy storage systems,and uninterrupted power *** possessing notably high specific capacities,vanadium-based materials exhibit severe instability at low current ***,the issue of stabilizing electrode reactions at these densities for vanadium-based materials has been explored insufficiently in existing *** review aims to investigate the matter of stability in vanadium-based materials at low current densities by concentrating on the mechanisms of capacity fading and optimization *** proposes a comprehensive approach that includes electrolyte optimization,electrode modulation,and electrochemical operational ***,we presented several crucial prospects for advancing the practical development of vanadium-based aqueous zinc-ion batteries.

关键词： Vanadium-based cathodes Low current density Capacity fading Zinc-ion batteries Stationary energy storage

Ethical concerns in aging research:perspectives of global frontline researchers

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science China life sciences 2024年

作者： Yaojin Peng Lulu Ding Zhenyu Xiao Moshi Song Jianwei Lü Guanghui Liu Key laboratory of Organ Regeneration and Reconstruction State Key Laboratory of Stem Cell and Reproductive Biology Institute of Zoology Chinese Academy of Sciences University of Chinese Academy of sciences Beijing Institute for Stem Cell and Regenerative Medicine Institute for Stem Cell and Regeneration Chinese Academy of Sciences Aging Biomarker Consortium (ABC) School of life science Beijing Institute of Technology School of life sciences Xiamen University Advanced Innovation Center for Human Brain Protection and National Clinical Research Center for Geriatric Disorders Xuanwu Hospital Capital Medical University Aging Translational Medicine Center International Center for Aging and Cancer Beijing Municipal Geriatric Medical Research Center Xuanwu Hospital Capital Medical University

This study investigated the ethical landscape of aging research amid the increasing global focus on extending the human lifespan and health span. Our global survey of 180 researchers across 38 jurisdictions revealed divergent perceptions of aging, a consensus regarding the feasibility of delaying aging, and multiple perspectives regarding lifespan extension. The present findings underscore a paradigm shift toward inclusive and ethically sound research, emphasizing the need for an approach that strikes a balance between basic and clinical research. In addition, this study highlighted key ethical concerns in aging research, including the effects of misleading advertising, potential inequality in access to aging interventions, and risks pertaining to the extrapolation of research findings from lower-model organisms to humans. The insights presented in this paper call for an integrated approach for overcoming the complex ethical and societal challenges in aging research to ensure responsible and equitable advancements in this burgeoning field.

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Erratum to:Efficient flexible perovskite solar cells and modules using a stable SnO_(2)-nanocrystal isopropanol dispersion

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Nano Research 2024年第5期17卷 4641-4642页

作者： Zhiwei Su Jing Li Ruixuan Jiang Shujie Zhang Chengkai Jin Feng Ye Bingcan Ke Mengjun Zhou Jinhui Tong Hyesung Park Fuzhi Huang Yi-Bing Cheng Tongle Bu State Key laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Material science and Engineering Wuhan University of TechnologyWuhan 430070China Department of Materials science and Engineering Graduate School of Semiconductor Materials and Devices EngineeringGraduate School of Carbon NerutralityLow Dimensional Carbon Materials CenterUlsan National Institute of Science and TechnologyUlsan 44919Republic of Korea Xianhu laboratory of the Advanced Energy science and Technology Guangdong Laboratry Foshan 528200China

Erratum to Nano Research,2024,17(4):2704-2711 https://***/10.1007/s12274-023-6115-y(1)In the article,the table of contents(TOC)image was unfortunately mispresented.

关键词： perovskite dispersion modules

高灵敏度和高线性度的可拉伸应变传感器的分层结构设计（英文）

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science China Materials 2024年

作者：武春锦彭义豪王少龙邱炳人李冠军曹玉杰赖文勇 State Key laboratory of Organic Electronics and Information Displays Institute of Advanced Materials (IAM) School of Chemistry and Life SciencesNanjing University of Posts & Telecommunications School of Environmental science Nanjing Xiaozhuang University

对柔性电子设备日益增长的需求使得开发具有高灵敏度和高线性度的传感器更加迫切.由于拉伸应变下不可逆结构损伤诱导电阻线性急剧增加,现有的可拉伸应变传感器难以完美地同时实现这两个特性.针对这一问题,本文提出了一种兼具表面褶皱和...

对柔性电子设备日益增长的需求使得开发具有高灵敏度和高线性度的传感器更加迫切.由于拉伸应变下不可逆结构损伤诱导电阻线性急剧增加,现有的可拉伸应变传感器难以完美地同时实现这两个特性.针对这一问题,本文提出了一种兼具表面褶皱和体相梯度孔隙的新型分级互连结构,利用水热活化机制精确控制纳米级褶皱间距,通过调控相分离中热力学和动力学行为构筑出体相梯度多孔结构,通过改变器件两侧曲率实现各向异性特征,深入研究各种设计的功效、量化几何结构对灵敏度的有效贡献和追踪形态演变.基于器件显著的灵敏度和各向异性,所制备的传感器能够有效监测静态和动态位移、表面运动、二维应变信号变化以及预测液位随时间变化.本工作为实现高质量的感知能力提供了一种广泛适用、适应性强、可扩展且具有成本效益的方法.

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