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The impact of the coupling relationship between projectile size and yarn dimension on the ballistic performance of plain weave fabric

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Defence Technology(防务技术) 2025年第1期43卷 288-303页

作者： Kaiying Wang xuan zhou Wenke Ren Yiding Wu Yilei Yu Yi zhou Lizhi Xu Guangfa Gao School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing210094China State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan430079China

Aramid fibers,due to their relatively high inter-yarn friction,high strength,high modulus,and other characteristics,have become a typical representative of flexible anti-ballistic materials in modern *** research on the anti-penetration of aramid fabrics mostly focuses unilaterally on the structure and performance of aramid fabrics or the shape and size of projectiles,with fewer studies on the coupled effect of both on ballistic *** study analyzes how the coupling relationship(or size effect)between the projectile and fiber bundle dimensions affects the fabric ballistic performance from a mesoscopic scale *** plain weave aramid fabric as the research object,considering different diameter projectiles,through a large number of ballistic impact tests and numerical simulations,parameters such as ballistic limit velocity,average energy absorption of fabric,and specific energy absorption ratio(average energy absorption of fabric divided by projectile cross-sectional area)are obtained for ballistic performance *** influence law of projectile size on the ballistic performance of high-performance fabrics is as follows:The relative range of fitted ballistic limit velocity at different target positions gradually decreases and then stabilizes as the projectile diameter increases,indicating that the fabric structure effect gradually disappears at a projectile diameter of 12 mm;The average ballistic limit velocity at three impact positions,P1,P2,and P3,provides the corresponding ballistic limit velocity for 1000D aramid fabric,which increases with projectile diameter but the rate of increase slows down at an inflection point,which in this study occurs where the fabric structure effect nearly disappears at a projectile diameter of 12 mm;The energy absorption ratio increases and then decreases as the projectile diameter increases from 4 mm to 20 mm,reaching a peak at the diameter of 12 mm due to the gradual disappearance of the fabri

关键词： Plain weave fabric Ballistic performance Aramid fiber Projectile size Ballistic experiment

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Flow behavior and dynamic softening mechanism of Pt−10Ir precious alloy

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中国有色金属学报 2025年第1期35卷 225-242页

作者： Xin-pei ZHANG Jun-jie HE Lin PI Quan FU Wen-yan zhou Jun CHENG Sheng-wen BAI xuan zhou Yi LIU Yong MAO Materials Genome Institute School of Materials and EnergyYunnan UniversityKunming 650091China Kunming Precious Materials&Technology Co. Ltd.Yunnan Precious Metals Laboratory Co.Ltd.Sino-Platinum Metals Co.Ltd.Kunming 650106China Kunming Institute of Precious Metals Kunming 650106China State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals Sino-Platinum Metals Co.Ltd.Kunming 650106China Shaanxi Key Laboratory of Biomedical Metal Materials Northwest Institute for Non-ferrous Metal ResearchXi’an 710016China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China

The hot deformation behavior of Pt−10Ir alloy was studied under a wide range of deformation *** a low deformation temperature(950−1150℃),the softening mechanism is primarily dynamic *** addition,dynamic recrystallization by progressive lattice rotation near grain boundaries(DRX by LRGBs)and microshear bands assisted dynamic recrystallization(MSBs assisted DRX)coordinate the ***,it is difficult for the dynamic softening to offset the stain hardening due to a limited amount of DRXed *** a high deformation temperature(1250−1350℃),three main DRX mechanisms associated with strain rates occur:DRX by LRGBs,DRX by a homogeneous increase in misorientation(HIM)and geometric DRX(GDRX).With increasing strain,DRX by LRGBs is enhanced gradually under high strain rates;the“pinch-off”effect is enhanced at low strain rates,which was conducive to the formation of a uniform and fine microstructure.

关键词： platinum alloy hot deformation microstructure evolution dynamic recovery dynamic recrystallization

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读华立《清代新疆社会变迁研究》

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西域研究 2025年第1期 164-166页

作者：周轩新疆大学历史学院

马大正先生主编的“中国西北边疆研究丛书”中,收录了华立教授的新著《清代新疆社会变迁研究》(528千字,西北大学出版社2021年12月出版)。华立女史考取戴逸先生博士时,得到悉心指点:“清朝对新疆的治理和开发着力尤多,内容丰富,而目前... 详细信息

马大正先生主编的“中国西北边疆研究丛书”中,收录了华立教授的新著《清代新疆社会变迁研究》(528千字,西北大学出版社2021年12月出版)。华立女史考取戴逸先生博士时,得到悉心指点:“清朝对新疆的治理和开发着力尤多,内容丰富,而目前的研究状况尚属薄弱,是一个迫切需要开拓的研究领域。研究清代新疆开发史,对于中国的西部建设亦将具有重要的借鉴意义。”

关键词：清代新疆社会变迁研究丛书开发史西北大学出版社

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Study on interface shear strength between polyurethane treated and original Pisha sandstone under dry-wet cycles

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Journal of Traffic and Transportation Engineering(English Edition) 2025年第01期 108-122页

作者： Wenbo Ma xuan zhou Jiaping Li Yanli Chen Yuyang Li Caiqian Yang Minke Ma Jiale Long Shuaicheng Guo College of Civil Engineering and Mechanics Xiangtan University School of Civil Engineering Southeast University Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province College of Civil Engineering Hunan University Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education College of Civil EngineeringHunan University

Currently, utilization of hydrophilic polyurethane(W-OH) materials for slope protection in arid areas has proved to be a cost-effective protocol. The treatment effect highly depends on the interfacial performance between the W-OH treated and the original sandstone. This study aims to investigate the corresponding shear strength and its long-term performance under dry-wet cycles under the arid environment. The results from the direct shear test indicate the interface shear strength increases with W-OH solution concentration and decreases with the increase of water content of the Pisha sandstone. Further investigations under dry-wet cycles indicate the interface cohesion is obviously weakened by the dry-wet cycles, while the influence on the internal friction angle is not obvious. The correlation between the degradation level and the dry-wet cycles can be well fitted with the inverted Scurve using two combined exponential functions. Furthermore, the ethylene-vinyl acetate(EVA) content is utilized to enhance the durability performance under dry-wet cycles. It is found the EVA can obviously improve the bonding property and the resistance to dry-wet cycles. This study's results can serve as a solid base for the application of W-OH materials to resolve the soil erosion in the arid region.

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From blocker to booster:Harnessing garnet surface chemistry for advanced solid-state electrolytes

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Nano Research 2025年第1期18卷 323-331页

作者： Jun Cheng xuan zhou Hongqiang Zhang Zhen Zeng Yuanyuan Li Yulong Zhu Yingsheng Liao Lijie Ci Deping Li State Key Laboratory of Precision Welding and Joining of Materials and Structures School of Materials Science and EngineeringHarbin Institute of Technology(Shenzhen)Shenzhen 518055China

Garnet electrolytes with high ionic conductivity and electrochemical stability are widely used as fillers to fabricate composite solid electrolytes(CPEs)within polymer ***,the performance of CPEs is significantly influenced by the surface characteristics of the garnet ***,the impact of garnet surface characteristics on CPEs was systematically investigated and a conversion from a typically unstable and Lewis basic surface to a more stable Lewis acidic surface was realized,which is shown to be more conductive to the improved performance of *** simultaneously removing the Li_(2)CO_(3)layer and applying a Li-Al-O coating,the influence of surface characteristics on CPEs was *** Lewis acid Li-Al-O surface coating not only promotes lithium salt dissociation,improving the ionic conductivity and ionic transfer number,but also prevents the reformation of the passive Lewis basic Li_(2)CO_(3)*** to garnet with a Lewis basic Li_(2)CO_(3)surface,the garnet modified with a Lewis acid Li-Al-O coating enhances CPEs,which exhibit an improved critical current density of 1.0 mA·cm^(-2)and highly stable lithium symmetric cell cycling for 400 h at 0.2 mA·cm^(-2).This research highlights the importance of surface chemistry in the design of high-performance solid-state batteries and presents a strategic modification approach for garnetbased CPEs.

关键词： garnet electrolyte composite solid electrolyte surface chemistry all-solid-state batteries

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基于改进H-AC算法的冷源系统节能优化控制策略

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华南理工大学学报(自然科学版) 2025年第1期53卷 21-31页

作者：周璇莫浩华闫军威华南理工大学机械与汽车工程学院广东广州510640 广州现代产业技术研究院广东广州511458 人工智能与数字经济广东省实验室(广州) 广东广州511442

中央空调冷源设备台数与运行参数的优化是一类离散与连续变量的协同优化问题,而经典强化学习算法难以优化此类问题。为此,该文提出了一种结合选项-评论者与演员-评论者框架的中央空调冷源系统节能优化控制策略。首先,采用分层演员-评论... 详细信息

中央空调冷源设备台数与运行参数的优化是一类离散与连续变量的协同优化问题,而经典强化学习算法难以优化此类问题。为此,该文提出了一种结合选项-评论者与演员-评论者框架的中央空调冷源系统节能优化控制策略。首先,采用分层演员-评论者(H-AC)算法分层优化设备台数与运行参数,且高层和底层模型共用Q网络评估状态价值,以解决多时间尺度下的优化难题;然后,在智能体架构、策略与网络更新方式等方面对H-AC算法进行改进,以加速智能体的收敛;最后,以夏热冬暖地区某科研办公建筑中央空调冷源系统为研究对象,基于冷源系统TRNSYS仿真平台进行实验。结果表明:在平均室内舒适时间占比分别增加14.08、11.23、29.70、9.07个百分比的前提下,基于改进H-AC算法的系统能耗分别比其他4种常规深度强化学习算法减少了32.28%、28.55%、28.63%、11.53%;虽然基于改进H-AC算法的系统能耗比基于选项-评论者框架的算法增加了0.27%,但获得了更平稳的学习过程且平均室内舒适时间占比增加了4.8个百分点。该文算法可为各类建筑中央空调冷源系统节能优化提供有效的技术手段,助力建筑“双碳”目标的实现。

关键词：冷源系统 TRNSYS仿真平台深度分层强化学习选项-评论者框架协同优化

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NAND闪存存储系统中的LDPC码优化设计

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中国科学:信息科学 2025年第1期55卷 202-216页

作者：周璇马征庞琦珂唐小虎西南交通大学信息科学与技术学院成都610031

面对日益增长的大容量需求, NAND闪存技术不断进步并实现了一系列突破,然而,存储密度的不断提升也极大程度削弱了NAND闪存系统的抗干扰能力.因此,针对NAND闪存存储系统中的差错控制码进行优化设计成为一个重要课题.本文首先对NAND闪存... 详细信息

面对日益增长的大容量需求, NAND闪存技术不断进步并实现了一系列突破,然而,存储密度的不断提升也极大程度削弱了NAND闪存系统的抗干扰能力.因此,针对NAND闪存存储系统中的差错控制码进行优化设计成为一个重要课题.本文首先对NAND闪存存储系统中的干扰源进行了全面分析,考虑到存储单元阈值电压的非对称非高斯特性,采用修正Student’s t分布对其建模.此外,考虑了实际NAND闪存中的量化问题,利用离散非对称密度进化算法分析了不同量化位宽和量化范围对LDPC码的影响,并对非规则LDPC码进行了优化设计.最后,以IEEE闪存标准中的LDPC码本为基础,对码本中的参数进行优化设计.仿真结果表明,经过优化设计的LDPC码本在存储单元的正常使用周期内,纠错性能提升1个数量级以上,并且能够有效延长存储单元的使用寿命.

关键词： NAND闪存系统低密度奇偶校验码修正Student’s t模型非对称密度进化算法量化

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Histopathological diagnosis of microvascular invasion in hepatocellular carcinoma:Is it reliable?

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World Journal of Gastroenterology 2025年第5期31卷 105-116页

作者： Liu-Jun Li Chao-Qun Wu Fei-Le Ye zhou xuan Xiao-Li Zhang Jian-Ping Li Jia zhou Zhong-Zhen Su Department of Ultrasound The First Affiliated HospitalHengyang Medical SchoolUniversity of South ChinaHengyang 421001Hunan ProvinceChina Department of Ultrasound The Fifth Affiliated Hospital of Sun Yat-sen UniversityZhuhai 519000Guangdong ProvinceChina Guangdong Provincial Key Laboratory of Biomedical Imaging and Guangdong Provincial Engineering Research Center of Molecular Imaging The Fifth Affiliated Hospital of Sun Yat-sen UniversityZhuhai 519000Guangdong ProvinceChina Department of Pathology The Fifth Affiliated Hospital of Sun Yat-sen UniversityZhuhai 519000Guangdong ProvinceChina Department of Pathology The First Affiliated HospitalHengyang Medical SchoolUniversity of South ChinaHengyang 421001Hunan ProvinceChina

BACKGROUND Microvascular invasion(MVI)is a critical prognostic factor for postoperative hepatocellular carcinoma recurrence,but the reliability of its current pathological diagnosis remains *** To evaluate the accuracy of current 7-point sampling methods and propose an optimal pathological protocol using whole-mount slide imaging(WSI)for better MVI *** We utilized 40 New Zealand white rabbits to establish VX2 liver tumor *** entire tumor-containing liver lobe was subsequently obtained,following which five different sampling protocols(A-E)were employed to evaluate the detection rate,accuracy,quantity,and distribution of MVI,with the aim of identifying the optimal sampling *** VX2 liver tumor models were successfully established in 37 rabbits,with an incidence of MVI of 81.1%(30/37).The detection rates[27%(10/37),43%(16/37),62%(23/37),68%(25/37),and 93%(14/15)]and quantity(15,36,107,125,and 395)of MVI increased significantly from protocols A to *** distribution of MVI showed fewer MVIs farther away from the tumor,but the percentage of MVI detected quantity gradually increased from 6.7%to 48.3%in the distant nonneoplastic liver tissue from protocols A to *** C was identified as the optimal sampling method by comparing them in *** sampling protocol of three consecutive interval WSIs at the tumor center(WSI3)was further screened to determine the optimal number of *** A(7-point sampling method)exhibited only 46%accuracy and a high false-negative rate of 67%.Notably,the WSI3 protocol improved the accuracy to 78%and decreased the false-negative rate to 27%.CONCLUSION The current 7-point sampling method has a high false-negative rate in MVI *** contrast,the WSI3 protocol provides a practical and effective approach to improve MVI diagnostic accuracy,which is crucial for hepatocellular carcinoma diagnosis and treatment planning.

关键词： Hepatocellular carcinoma Microvascular invasion Histopathological diagnosis Whole-mount slide imaging Sampling protocol

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党的二十大精神融入装配式建筑课程的研究与应用

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科技资讯 2025年第1期23卷 1-4页

作者：殷乐周璇湖南水利水电职业技术学院湖南长沙410000

在党的二十大精神的指引下,湖南省提出了因地制宜的“三高四新”战略。为建设“四新”中的制造业高地、建设装配式产业链和智能建造产业链,高职教育需要培养具备心怀天下、人民至上理念、高度职业素养和创新能力的土木工程工匠。因此,... 详细信息

在党的二十大精神的指引下,湖南省提出了因地制宜的“三高四新”战略。为建设“四新”中的制造业高地、建设装配式产业链和智能建造产业链,高职教育需要培养具备心怀天下、人民至上理念、高度职业素养和创新能力的土木工程工匠。因此,装配式建筑课程须融入党的二十大思政元素,以“1—2—3—5”教学模式的形式,将教学内容进行重构,按照“构件—楼层—建筑整体”层层递进,将守正创新、人民至上、自信自立、系统观念等思政元素与装配式建筑产业链的专业技能培养相结合,激发学生的爱国意识、创新意识,积极贯彻党的二十大精神,实现学生五育并举、全面发展的培养目标。

关键词：党的二十大精神三高四新装配式建筑课程设计思政

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Dynamic development of microglia and macrophages after spinal cord injury

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Neural Regeneration Research 2025年第12期20卷 3606-3619页

作者： Hu-Yao zhou Xia Wang Yi Li Duan Wang xuan-Zi zhou Nong Xiao Guo-Xing Li Gang Li Institute of Life Sciences Chongqing Medical UniversityChongqingChina Department of Rehabilitation Children’s Hospital of Chongqing Medical UniversityNational Clinical Research Center for Child Health and DisordersMinistry of Education Key Laboratory of Child Development and DisordersChongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory DisordersChongqingChina Molecular Medicine Diagnostic and Testing Center Chongqing Medical UniversityChongqingChina

Secondary injury following spinal cord injury is primarily characterized by a complex inflammatory response,with resident microglia and infiltrating macrophages playing pivotal *** previous studies have grouped these two cell types together based on similarities in structure and function,an increasing number of studies have demonstrated that microglia and macrophages exhibit differences in structure and function and have different effects on disease *** this study,we used single-cell RNA sequencing and spatial transcriptomics to identify the distinct evolutionary paths of microglia and macrophages following spinal cord *** results showed that microglia were activated to a pro-inflammatory phenotype immediately after spinal cord injury,gradually transforming to an anti-inflammatory steady state phenotype as the disease *** macrophages,our findings highlighted abundant communication with other cells,including fibroblasts and *** pro-inflammatory and neuroprotective effects of macrophages were also identified;the pro-inflammatory effect may be related to integrin β2(Itgb2) and the neuroprotective effect may be related to the oncostatin M *** findings were validated by in vivo *** research underscores differences in the cellular dynamics of microglia and macrophages following spinal cord injury,and may offer new perspectives on inflammatory mechanisms and potential therapeutic targets.

关键词： acute inflammation bioinformatics analysis fibroblast integrinβ2 ligand-receptor interaction neuroinflammation oncostatin M single-cell RNA sequencing spatial transcriptomics spinal cord injury

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