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Moving doubly heavy baryon in a strongly coupled plasma via holography

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Chinese Physics C 2024年第8期48卷 42-55页

作者： Xuan Liu Jia-Jie Jiang xun chen Mitsutoshi Fujita Akira Watanabe School of Nuclear Science and Technology University of South ChinaHengyang 421001China School of Mathematics and Physics University of South ChinaHengyang 421001China

Gauge/gravity duality is used to study the properties of the doubly heavy baryon(QQq)at finite rapidity and temperature in heavy-ion *** investigate the impact of rapidity on string breaking and screening of QQq and compare these effects with the results for QQ¯in *** reveal that the string-breaking distances of QQq and QQ¯are close in the confined state,and the effects of rapidity and temperature on the string breaking are not *** interesting result shows that QQq cannot be determined at sufficiently high temperatures and ***,QQ¯can exist under any conditions as long as the separation distance is sufficiently ***,the screening distances of QQq and QQ¯are compared at finite rapidity and *** on the above analysis,we infer that QQ¯is more stable than QQq at finite rapidity and temperature.

关键词： holographic QCD QGP heavy quark

Highly Stable sp^(2) Carbon-Conjugated Porous Organic Cages

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CCS Chemistry 2024年第1期6卷 149-156页

作者： Fenglei Qiu xun chen Wenjing Wang Kongzhao Su Daqiang Yuan State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhouFujian 350002 College of Chemistry Fuzhou UniversityFuzhouFujian 350116 University of the Chinese Academy of Sciences Beijing 100049

The high-yield synthesis of ultrastable porous organic cages(POCs)by facile methods is highly desirable but *** by highly stable sp^(2) carbon-conjugated(C=C)covalent organic frameworks,we used rational design and synthesized the first family of sp^(2) carbon-linked POCs(sp^(2)c-POCs)with triangular prism shapes by a one-step Knoevenagel reaction that is a high yield[2+3]condensation *** stability of sp^(2)c-POC was demonstrated under strenuous conditions involving for example concentrated HCl or saturated NaOH ***^(2)c-POC was used as a robust adsorbent for efficient separation of CO_(2)/CH_(4) or CO_(2)/N_(2) *** view of their facile synthesis and unique properties,we expect widespread use of these sp^(2) C=C linkages in the development of POC materials.

关键词： porous organic cages Knoevenagel condensation sp^(2)C=C linkage exceptional chemical stability gas adsorption and separation properties

A memory-friendly class-incremental learning method for hand gesture recognition using HD-sEMG

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Medicine in Novel Technology and Devices 2024年第2期22卷 124-132页

作者： Yu Bai Le Wu Shengcai Duan xun chen The School of Information Science and Technology University of Science and Technology of ChinaHefei230027China

Hand gesture recognition(HGR)plays a vital role in human-computer *** integration of high-density surface electromyography(HD-sEMG)and deep neural networks(DNNs)has significantly improved the robustness and accuracy of HGR *** methods are typically effective for a fixed set of trained ***,the need for new gesture classes over time poses a *** new classes to DNNs can lead to a substantial decrease in accuracy for previously learned tasks,a phenomenon known as“catastrophic forgetting,”especially when the training data for earlier tasks is not retained and *** issue is exacerbated in embedded devices with limited storage,which struggle to store the large-scale data of ***incremental learning(CIL)is an effective method to reduce catastrophic ***,existing CIL methods for HGR rarely focus on reducing memory *** address this,we propose a memory-friendly CIL method for HGR using *** approach includes a lightweight convolutional neural network,named SeparaNet,for feature representation learning,coupled with a nearest-mean-of-exemplars classifier for *** introduce a priority exemplar selection algorithm inspired by the herding effect to maintain a manageable set of exemplars during ***,a task-equal-weight exemplar sampling strategy is proposed to effectively reduce memory load while preserving high recognition *** results on two datasets demonstrate that our method significantly reduces the number of retained exemplars to only a quarter of that required by other CIL methods,accounting for less than 5%of the total samples,while still achieving comparable average accuracy.

关键词： Myoelectric pattern recognition Memory-friendly Class-incremental learning

Sorl1 knockout inhibits expression of brain-derived neurotrophic factor:involvement in the development of late-onset Alzheimer's disease

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Neural Regeneration Research 2024年第7期19卷 1602-1607页

作者： Mingri Zhao xun chen Jiangfeng Liu Yanjin Feng chen Wang Ting Xu Wanxi Liu Xionghao Liu Mujun Liu Deren Hou Department of Neurology The Third Xiangya Hospital of Central South UniversityChangshaHunan ProvinceChina Center for Medical Genetics&Hunan Key Laboratory of Medical Genetics School of Life SciencesCentral South UniversityChangshaHunan ProvinceChina Department of Cell Biology School of Life SciencesCentral South UniversityChangshaHunan ProvinceChina

Sortilin-related receptor 1(SORL1)is a critical gene associated with late-onset Alzheimer’s ***1 contributes to the development and progression of this neurodegenerative condition by affecting the transport and metabolism of intracellularβ-amyloid precursor *** better understand the underlying mechanisms of SORL1 in the pathogenesis of late-onset Alzheimer s disease,in this study,we established a mouse model of SorI1 gene knockout using cluste red regularly inters paced short palindro mic repeats-associated protein 9 *** found that Sorl1-knocko ut mice displayed deficits in learning and ***,the expression of brain-derived neurotrophic factor was significantly downregulated in the hippocampus and co rtex,and amyloidβ-protein deposits were observed in the brains of 5orl1-knockout *** vitro,hippocampal neuronal cell synapses from homozygous Sorl1-knockout mice were *** expression of synaptic proteins,including Drebrin and NR2B,was significantly reduced,and also their ***,by knocking out the Sorl1 gene in N2a cells,we found that expression of the N-methyl-D-aspartate receptor,NR2B,and cyclic adenosine monophosphate-response element binding protein was also *** findings suggest that SORL1 participates in the pathogenesis of late-onset Alzheimer s disease by regulating the N-methyl-D-aspartate receptor NR2B/cyclic adenosine monophosphate-response element binding protein signaling axis.

关键词： brain-derived neurotrophic factor late-onset Alzheimer’s disease N-methyl-D-aspartate receptor sortilin-related receptor 1 synapse

Pain perception enhancement in consecutive secondeye phacoemulsification cataract surgeries under topical anesthesia

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International Journal of Ophthalmology(English edition) 2024年第8期17卷 1510-1518页

作者： Jia-Wei Luo Yan-Hua chen Jian-Feng Yu Yi-xun chen Min Ji Huai-Jin Guan Eye Institute Affiliated Hospital of Nantong UniversityMedical School of Nantong UniversityNantong 226001Jiangsu ProvinceChina Nantong Center for Disease Control and Prevention Nantong 226001Jiangsu ProvinceChina

Cataract is the main cause of visual impairment and blindness worldwide while the only effective cure for cataract is still *** phacoemulsification under topical anesthesia has been the routine procedure for cataract ***,patients often grumbled that they felt more painful during the second-eye surgery compared to the first-eye *** intraoperative pain experience has negative influence on satisfaction and willingness for second-eye cataract surgery of patients with bilateral *** ocular pain is a complicated process induced by the nociceptors activation in the peripheral nervous ***,neuropsychological,and pharmacological factors work together in the enhancement of intraoperative *** published literatures have focused on the pain enhancement during the secondeye phacoemulsification *** this review,we searched PubMed database for articles associated with pain perception differences between consecutive cataract surgeries published up to Feb.1,*** summarized the recent research progress in mechanisms and interventions for pain perception enhancement in consecutive secondeye phacoemulsification cataract *** review aimed to provide novel insights into strategies for improving patients’intraoperative experience in second-eye cataract surgeries.

关键词： ocular pain cataract surgery topical anesthesia intraoperative experience second-eye phacoemulsification

Polar-coordinate line-projection light-curing continuous 3D printing for tubular structures

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INTERNATIONAL JOURNAL OF EXTREME MANUFACTURING 2024年第4期6卷 247-260页

作者： Wang, Huiyuan Liu, Siqin Yin, Xincheng Huang, Mingming Fu, Yanzhe chen, xun Wang, Chao Sun, Jingyong Yan, Xin Han, Jianmin Yang, Jiping Wang, Zhijian Wang, Lizhen Fan, Yubo Li, Jiebo Beihang Univ Inst Med Photon Beijing Adv Innovat Ctr Biomed Engn Key Lab Biomech & MechanobiolMinist EducSch Biol Beijing 100191 Peoples R China Beihang Univ Sch Mech Engn & Automat Beijing 100191 Peoples R China Peking Univ Sch & Hosp Stomatol Beijing 100081 Peoples R China Beihang Univ Sch Mat Sci & Engn Beijing 100191 Peoples R China

3D printing techniques offer an effective method in fabricating complex radially multi-material structures. However, it is challenging for complex and delicate radially multi-material model geometries without supporting structures, such as tissue vessels and tubular graft, among others. In this work, we tackle these challenges by developing a polar digital light processing technique which uses a rod as the printing platform. The 3D model fabrication is accomplished through line projection. The rotation and translation of the rod are synchronized to project and illuminate the photosensitive material volume. By controlling the distance between the rod and the printing window, we achieved the printing of tubular structures with a minimum wall thickness as thin as 50 micrometers. By controlling the width of fine slits at the printing window, we achieved the printing of structures with a minimum feature size of 10 micrometers. Our process accomplished the fabrication of thin-walled tubular graft structure with a thickness of only 100 micrometers and lengths of several centimeters within a timeframe of just 100 s. Additionally, it enables the printing of axial multi-material structures, thereby achieving adjustable mechanical strength. This method is conducive to rapid customization of tubular grafts and the manufacturing of tubular components in fields such as dentistry, aerospace, and more. Polar-coordinate-based line projection enables rapid printing of tubular structures with higher precision and compressive strength. Using a cylindrical auxiliary axis allows for the manufacture of radial multi-material structures and facilitates printing of coaxial structures. It is beneficial for the rapid customization of tubular implants and for manufacturing tubular components in dentistry, aerospace, and other fields.

关键词： 3D printing polar coordinate line projection light-curing tubular structure radially multi-material structures PROCESS PARAMETERS STENT FABRICATION

α-particle preformation factors in heavy and superheavy nuclei

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Chinese Physics C 2024年第4期48卷 146-158页

作者：骆松张冬萌亓林静陈勋初鹏程李小华 School of Nuclear Science and Technology University of South ChinaHengyang 421001China School of Mathematics and Physics Qingdao University of Science and TechnologyQingdao 266033China National Exemplary Base for International Sci&Tech.Collaboration of Energy and Nuclear Safety University of South ChinaHengyang 421001China Cooperative Innovation Center for Nuclear Fuel Cycle Technology&Equipment University of South ChinaHengyang 421001China Key Laboratory of Low Dimensional Quantum Structures and Quantum Control Hunan Normal UniversityChangsha 410081China

In this study,α-particle preformation factors in heavy and superheavy nuclei from ^(220)Th to ^(294)Og are *** combing experimental α decay energies and half-lives,the α-particle preformation factors P_(α) are extracted from the ratios between theoretical α decay half-lives calculated using the Two-Potential Approach (TPA)and experimental *** find that the α-particle preformation factors exhibit a noticeable odd-even staggering behavior,and unpaired nucleons inhibit α-particle ***,we find that both the α decay energy and mass number of parent nucleus exhibit considerable regularity with the extracted experimental α-particle preformation *** considering the major physical factors,we propose a local phenomenological formula with only five valid parameters for α-particle preformation factors P_(α).This analytic expression has a clear physical meaning as well as good *** an application,this analytic formula is extended to estimate the α-particle preformation factors and further predict the α decay half-lives for unknown even-even nuclei with Z=118 and 120.

关键词： αdecay half-lives preformation factors heavy and superheavy nuclei

Polar-coordinate line-projection light-curing continuous 3D printing for tubular structures

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International Journal of Extreme Manufacturing 2024年第4期 251-265页

作者： Huiyuan Wang Siqin Liu Xincheng Yin Mingming Huang Yanzhe Fu xun chen Chao Wang Jingyong Sun Xin Yan Jianmin Han Jiping Yang Zhijian Wang Lizhen Wang Yubo Fan Jiebo Li Key Laboratory of Biomechanics and Mechanobiology (Beihang University) Ministry of EducationInstitute of Medical PhotonicsBeijing Advanced Innovation Center for Biomedical EngineeringSchool of Biological Science and Medical EngineeringBeihang University School of Mechanical Engineering and Automation Beihang University Peking University School and Hospital of Stomatology School of Materials Science and Engineering Beihang University

3D printing techniques offer an effective method in fabricating complex radially multi-material structures. However, it is challenging for complex and delicate radially multi-material model geometries without supporting structures, such as tissue vessels and tubular graft, among *** this work, we tackle these challenges by developing a polar digital light processing technique which uses a rod as the printing platform. The 3D model fabrication is accomplished through line projection. The rotation and translation of the rod are synchronized to project and illuminate the photosensitive material volume. By controlling the distance between the rod and the printing window, we achieved the printing of tubular structures with a minimum wall thickness as thin as50 micrometers. By controlling the width of fine slits at the printing window, we achieved the printing of structures with a minimum feature size of 10 micrometers. Our process accomplished the fabrication of thin-walled tubular graft structure with a thickness of only 100micrometers and lengths of several centimeters within a timeframe of just 100 s. Additionally, it enables the printing of axial multi-material structures, thereby achieving adjustable mechanical strength. This method is conducive to rapid customization of tubular grafts and the manufacturing of tubular components in fields such as dentistry, aerospace, and more.

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《红楼梦》缘何“说不尽”

求是学刊 2024年第2期51卷 157-168页

作者：陈才训毛艳秋南开大学文学院天津300071 黑龙江大学文学院哈尔滨150080

曹雪芹屡屡以隐晦婉曲的“春秋笔法”叙事写人,使《红楼梦》颇多“烟云模糊处”;他又“远师楚人”,以比兴寄托之象征手法塑造意象化人物,并通过系统的叙事意象寄寓情志;“一芹一脂”共同塑成了充满“矛盾”与张力的开放性小说文本形态;... 详细信息

曹雪芹屡屡以隐晦婉曲的“春秋笔法”叙事写人,使《红楼梦》颇多“烟云模糊处”;他又“远师楚人”,以比兴寄托之象征手法塑造意象化人物,并通过系统的叙事意象寄寓情志;“一芹一脂”共同塑成了充满“矛盾”与张力的开放性小说文本形态;经学阐释传统之“过度阐释”与“强制阐释”对小说批评领域的强势介入:这些都在不同程度上左右着人们对《红楼梦》的阐释维度。正因《红楼梦》呈现出“伟大的混沌”状态,阐释者才会歧见纷出,从而成就了其“说不尽”的艺术魅力。

关键词：《红楼梦》曲笔人物意象与叙事意象开放性文本 “无结局”小说过度阐释与强制阐释