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Tectonic modes of mantle convection and their implications for Earth's tectonic evolution based on three-dimensional numerical simulations

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Science China Earth Sciences 2025年第1期 270-296页

作者： song XIANG Jinshui HUANG Bingcheng WU School of Earth and Space Sciences University of Science and Technology of China CAS Center of Excellence in Comparative Planetary Studies

Five tectonic modes of mantle convection are obtained and analyzed with three-dimensional numerical models in a spherical shell domain. The five tectonic convective modes are non-plate mobile-lid, plate-like mobile-lid, episodic plate-like mobile-lid, episodic stagnant-lid, and stagnant-lid convective modes, respectively. The typical characteristics of these five tectonic modes and their numerical classification criteria based on plateness, mobility, and their standard deviations are presented and discussed. The results show that the yield stress of the lithosphere has profound effects on the tectonic convective *** the gradual increase of yield stress, the tectonic mode of mantle convection changes from one to another sequentially through the aforementioned five modes. Additionally, as the Rayleigh number increases, the range of yield stress for the platelike mobile-lid convective mode decreases, and the dimensionless transition stress between different tectonic modes ***, the dimensional transition stress between the non-plate mobile-lid convective mode and plate-like mobile-lid convective mode increases with the increase of Rayleigh number, but decreases between other tectonic modes. Furthermore, we find that the transition stress between different tectonic modes is inversely proportional to the internal heating rate, with the transition stress decreasing as the internal heating rate increases. The fitting analysis of the transition stress between tectonic modes shows that Earth's current plate tectonics correspond to a lithospheric yield stress of 150–250 MPa, which aligns with the strength of serpentinized mantle rock determined by experimental petrography. If the Archean mantle was 300°C warmer than it is today, then the Earth was in an episodic stagnant-lid convective mode. The tectonic evolution of the Earth's surface is closely related to the lithospheric strength and the process of thermal evolution. If the lithospheric strength w

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Accuracy and Consistency of the Explicit-Invariant Energy Quadratization Approach for the Cahn-Hilliard Equation

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Journal of Mathematical Research with Applications 2025年第1期 84-104页

作者： Jun ZHANG Fangying song Yu ZHANG Computational Mathematics Research Center Guizhou University of Finance and Economics School of mathematics and statistics Guizhou University of Finance and Economics School of Mathematics and Stastistics Fuzhou University

It is well known that the explicit-invariant energy quadratization (EIEQ) approach can generate fully decoupled, linear and unconditionally energy-stable numerical schemes, so it is favored by many researchers. However, the undeniable fact is that the numerical method obtained by EIEQ approach preserves the “modified” energy law instead of the original *** is mainly due to the introduction of some auxiliary variables in EIEQ scheme, and the truncation error will make the auxiliary variables deviate from the original definition in the process of numerical calculation. The primary objective of this paper is to address this gap by providing the accuracy and consistency of the EIEQ method in the context of the CahnHilliard equation. We introduce a relaxation technique for auxiliary variables and construct two numerical schemes based on EIEQ. The analysis results show that the newly constructed schemes are not only unconditionally energy stable, linear and fully decoupled, but also can effectively correct the errors introduced by auxiliary variables and follow the original energy ***, several 2D and 3D numerical examples illustrate the accuracy and efficiency of the newly constructed numerical schemes.

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Pulp health and calcific healing of a complicated crown–root fracture with additional root fracture in a maxillary incisor: A case report

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World Journal of Clinical Cases 2025年第3期13卷 42-49页

作者： Na Li Yue-Yue Ren Ying Tang Qi Yang Tian-Tian Meng song Li Jing Zhang Stomatological Hospital and College Anhui Medical UniversityHefei 230032Anhui ProvinceChina Department of Endodontics The Affiliated Stomatological Hospital of Xuzhou Medical UniversityXuzhou 221000Jiangsu ProvinceChina

BACKGROUND Complicated crown–root fracture (CRF) involves severe injury to the crown, root,and pulp, and may be accompanied by multiple root fractures. The loss of a toothhas lifelong consequences for children and teenagers, but the maintenance of pulphealth and the calcific healing of multiple root fractures are rarely reported in *** SUMMARY This case reports healing of a permanent tooth with complicated crown–root andadditional root fractures, in which pulp health was maintained. A 10-year-old girlfell and fractured the root of her maxillary left central incisor at the cervical *** the coronal fragment was repositioned, the tooth was splinted until thetooth was no longer mobile, 2 years later. Eight years after treatment, the toothhas remained asymptomatic with vital pulp and localized gingival ***-beam computed tomography revealed not only calcified healing of the CRFbut also spontaneous healing in an additional undiagnosed root fracture. Thefracture line on the enamel could not be healed by hard tissue and formed agroove in the cervical crown. It was speculated that the groove was related to thelocalized gingival *** This case provides a clinical perspective of the treatment of a tooth with acomplicated CRF and an additional root fracture.

关键词： Complicated crown-root fracture Multiple root fracture Spontaneous healing Cone-beam computed tomography Long-term follow-up Case report

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Small modifications of endo-functionalized cavities lead to large changes in molecular interaction in water

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Science China Chemistry 2025年第1期 369-376页

作者： song-Meng Wang Hao Nian Yan-Fang Wang Li-Shuo Zheng Yu-Tao Zheng Yi-Wei Dong Liping Huang Xiaoping Wang Wei Jiang Liu-Pan Yang Department of Chemistry Southern University of Science and Technology School of Chemistry and Pharmaceutical Sciences State Key Laboratory for Chemistry and Molecular Engineering of Medicinal ResourcesGuangxi Normal University School of Pharmaceutical Science Hengyang Medical School University of South China

Studying molecular recognition in aqueous environments is crucial for understanding biological processes. Herein, we present a series of N-doped endo-functionalized anthracene-based cavities by introducing inward-directed pyridine units. The subtle modifications can significantly affect the binding properties of these receptors, which is similar to the mutations in biological systems. Combining theoretical calculations and molecular recognition experiments demonstrated that these “mutations” have an impact on the hydrophobicity and charge distribution of the hosts, consequently significantly influencing molecular *** is crucial for understanding the intricate mechanisms of molecular-level interactions in biological receptors.

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发展银发经济的战略设计、焦点难点及路径优化

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新疆师范大学学报（哲学社会科学版） 2025年第2期46卷 59-69,F0002页

作者：黄石松胡清中国人民大学国家发展与战略研究院北京100872 中国人民大学老年学研究所北京100872

我国正处于由中度老龄化社会步入重度老龄化社会的进程,银发经济将逐步从“以政府为主导的事业发展”阶段转向“事业和产业协同发展”的新阶段。准确把握这一转型发展特征,适时调整工作重心和节奏,注重运用市场机制推进产业发展迫在眉... 详细信息

我国正处于由中度老龄化社会步入重度老龄化社会的进程,银发经济将逐步从“以政府为主导的事业发展”阶段转向“事业和产业协同发展”的新阶段。准确把握这一转型发展特征,适时调整工作重心和节奏,注重运用市场机制推进产业发展迫在眉睫。对银发产业进行业态划分是制定产业组织政策、产业管理政策、产业发展政策的前提和基础,文本尝试将我国银发产业划分为基础性产业、延伸性产业和战略性产业,并据此分析三类产业在发展中存在的焦点难点问题,按照分类精准施策原则,提出优化我国银发经济发展路径的政策建议。

关键词：银发经济老龄产业老龄事业战略设计业态划分

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黄河下游流域的文化界说——兼论华北平原在黄河文化中的历史地位

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河北学刊 2025年第1期45卷 98-110页

作者：王志民宋宁山东师范大学齐鲁文化研究院

黄河下游流域与文化的界定,是黄河文化研究中的一个重大问题。论者将黄淮海平原的广阔区域都作为黄河下游流域的传统看法是不恰当的。淮河作为一条大河,自有其独立的流域范围,“夺淮入海”时期,黄河夺占淮河支流和主河道,主要系人为因... 详细信息

黄河下游流域与文化的界定,是黄河文化研究中的一个重大问题。论者将黄淮海平原的广阔区域都作为黄河下游流域的传统看法是不恰当的。淮河作为一条大河,自有其独立的流域范围,“夺淮入海”时期,黄河夺占淮河支流和主河道,主要系人为因素改道和维持所致,且多为河道游移、水系混乱的“地上河”,并未形成自己的“集水区”;在文化上,淮河文化是长江文化的亚文化,在春秋战国时期是长江楚文化的重要组成部分。故无论从流域还是文化上看,淮河流域都不能作为黄河下游流域看待。泰沂山西延伏脉以北的华北平原,是黄河天然形成的入海之地;在秦汉以前,是中华文明起源、三代文明奠基的重要区域之一,是春秋战国时代的文化重心,是实现秦汉“大一统”的经学繁荣基地和思想库。该地区在中华文明起源、形成及中华民族共同体奠基的重要历史时期作出了突出贡献,是奠定黄河文化为中华民族“根”与“魂”的核心区之一。华北平原及其文化就是黄河下游的流域与文化。

关键词：黄河下游文化界说华北平原黄河文化

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A novel flexible nerve guidance conduit promotes nerve regeneration while providing excellent mechanical properties

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Neural Regeneration Research 2025年第7期20卷 2084-2094页

作者： Tong Li Quhan Cheng Jingai Zhang Boxin Liu Yu Shi Haoxue Wang Lijie Huang Su Zhang Ruixin Zhang song Wang Guangxu Lu Peifu Tang Zhongyang Liu Kai Wang Department of Orthopedics the Fourth Medical Center of Chinese PLA General HospitalBeijingChina Department of Training and Sports Medicine Characteristic Medical Center of Chinese People’s Armed Police ForceTianjinChina Medical School of Chinese PLA BeijingChina Key Laboratory of Bioactive Materials for the Ministry of Education College of Life SciencesNankai UniversityTianjinChina Department of Orthopedics Tianjin HospitalTianjinChina Department of Rehabilitation Medicine Er Quan Hospital of PAPWuxiJiangsu ProvinceChina

Autografting is the gold standard for surgical repair of nerve defects>5 mm in length;however,autografting is associated with potential complications at the nerve donor *** an alternative,nerve guidance conduits may be *** ideal conduit should be flexible,resistant to kinks and lumen collapse,and provide physical cues to guide nerve *** designed a novel flexible conduit using electrospinning technology to create fibers on the innermost surface of the nerve guidance conduit and employed melt spinning to align ***,we prepared disordered electrospun fibers outside the aligned fibers and helical melt-spun fibers on the outer wall of the electrospun fiber *** presence of aligned fibers on the inner surface can promote the extension of nerve cells along the *** helical melt-spun fibers on the outer surface can enhance resistance to kinking and compression and provide *** novel conduit promoted nerve regeneration and functional recovery in a rat sciatic nerve defect model,suggesting that it has potential for clinical use in human nerve injuries.

关键词： aligned fibers anti-kinking helical fibers nerve guidance conduit nerve regeneration peripheral nerve injury topological guidance

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Profile of Weibo song

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Science China(Life Sciences) 2016年第9期59卷 906-908页

作者： song Weibo

*** song received his *** in the Zoological Institute,Bonn University,Germany,in January *** then joined the College of Fisheries,Ocean University of China（OUC）,and was qualified as a lecturer,associate professor an... 详细信息

关键词：新浪中国海洋大学动物研究所波恩大学博士生实验室

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汉末三国的军师

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南都学坛 2025年第1期45卷 1-12页

作者：宋杰首都师范大学历史学院北京100089

“军师”是为君主将帅谋划作战事务的文职官员,周代尊称为“师”,两汉之际始称“军师”。汉末三国曹操的首位军师是周,后来荀攸作为军师跟随他征伐中原,屡立奇功。曹操被封魏公后,设立有中军师、前军师、左右军师等,文帝以降又在中军和... 详细信息

“军师”是为君主将帅谋划作战事务的文职官员,周代尊称为“师”,两汉之际始称“军师”。汉末三国曹操的首位军师是周,后来荀攸作为军师跟随他征伐中原,屡立奇功。曹操被封魏公后,设立有中军师、前军师、左右军师等,文帝以降又在中军和边防外军都督属下置军师,参赞军务,代表朝廷监督主将。蜀汉刘备先后任命诸葛亮为军师中郎将、军师将军,有带兵的权力。诸葛亮执政后设前军师、中军师等荣誉官衔,到他死后逐渐取消。孙吴长期未设军师,曾经颁授的也只是荣誉性的附加职衔,起不到为君主参议军事的作用。吴、蜀军师的虚设与消亡,与其人才匮乏有密切关系。

关键词：师军师祭酒周荀攸诸葛亮

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脱落酸代谢及信号转导对胡萝卜CO2加富的响应分析

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核农学报 2025年第2期39卷 275-286页

作者：宋红霞高崇真朱伟龙路强宋甜月山西农业大学园艺学院

胡萝卜作为世界十大蔬菜之一，随着设施农业的发展实现了周年供应。增施CO2可提高胡萝卜产量和类胡萝卜素积累，而脱落酸（ABA）是调控植物生长和响应外界刺激的重要激素。为了探究胡萝卜ABA代谢和信号转导响应CO2加富的分子机制，本研... 详细信息

胡萝卜作为世界十大蔬菜之一，随着设施农业的发展实现了周年供应。增施CO2可提高胡萝卜产量和类胡萝卜素积累，而脱落酸（ABA）是调控植物生长和响应外界刺激的重要激素。为了探究胡萝卜ABA代谢和信号转导响应CO2加富的分子机制，本研究分析CO2加富与对照条件下ABA含量和9-顺式环氧类胡萝卜素双加氧酶（NCED）含量的变化；利用RNA-Seq分析CO2加富条件下脱落酸代谢和信号转导过程中参与的关键基因表达情况。结果发现，增施CO2抑制了ABA的合成，降低了酶含量；转录组分析共获得482个差异表达基因（DEGs），其中16个直接响应ABA代谢或与ABA信号转导相关，7个与ABA代谢相关，9个参与ABA信号通路，初步揭示了ABA信号和CO2感知之间的分子关联，ABA不仅高度响应CO2浓度变化，而且参与信号转导过程，调控生长发育。本研究结果为CO2加富条件下ABA积累机制和调控ABA信号转导机制探究提供了参考。

关键词：胡萝卜脱落酸 CO2加富信号转导

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