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A novel triple periodic minimal surface-like plate lattice and its data-driven optimization method for superior mechanical properties

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Applied Mathematics and Mechanics(English Edition) 2024年第2期45卷 217-238页

作者： Yanda wang Yanping lian Zhidong wang chunpeng wang Daining FANG State Key Laboratory for Turbulence and Complex Systems&Center for Applied Physics and Technology College of EngineeringPeking UniversityBeijing 100871China Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China

Lattice structures can be designed to achieve unique mechanical properties and have attracted increasing attention for applications in high-end industrial equipment,along with the advances in additive manufacturing(AM)*** this work,a novel design of plate lattice structures described by a parametric model is proposed to enrich the design space of plate lattice structures with high connectivity suitable for AM *** parametric model takes the basic unit of the triple periodic minimal surface(TPMS)lattice as a skeleton and adopts a set of generation parameters to determine the plate lattice structure with different topologies,which takes the advantages of both plate lattices for superior specific mechanical properties and TPMS lattices for high connectivity,and therefore is referred to as a TPMS-like plate lattice(TLPL).Furthermore,a data-driven shape optimization method is proposed to optimize the TLPL structure for maximum mechanical properties with or without the isotropic *** this method,the genetic algorithm for the optimization is utilized for global search capability,and an artificial neural network(ANN)model for individual fitness estimation is integrated for high efficiency.A set of optimized TLPLs at different relative densities are experimentally validated by the selective laser melting(SLM)fabricated *** is confirmed that the optimized TLPLs could achieve elastic isotropy and have superior stiffness over other isotropic lattice structures.

关键词： lattice structure triple periodic minimal surface(TPMS) plate lattice structural optimization machine learning

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Weak GPS signal acquisition method based on DBZP

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Journal of Systems Engineering and Electronics 2018年第2期29卷 236-243页

作者： wang Jianing lian Baowang XUE Zhe School of Electronics and Information Northwestern Polytechnical UniversityXi’an 710072China Xi’an Modern Control Technology Research Institute Xi’an 710065China

Double block zero padding(DBZP) is a widely used but costly method for weak global positioning system(GPS) signal acquisition in software receivers. To improve the computational efficiency, this paper proposes an algorithm based on the differential DBZP algorithm and the discrete cosine transform(DCT) domain filtering method. The proposed method involves using a differential correlator after the DBZP operation. Subsequently, DCT domain low pass filtering(LPF) and inverse DCT(IDCT) reconstruction are carried out to improve the signal to noise ratio(SNR). The theoretical analysis and simulation results show that the detection algorithm can effectively improve the SNR of the acquired signal and increase the probability of detection under the same false alarm probability.

关键词： global positioning system(GPS) double block zero padding(DBZP) discrete cosine transform(DCT) differential coherent combing

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Injury to the axillary artery and brachial plexus caused by a closed floating shoulder injury: A case report

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World Journal of Clinical Cases 2018年第15期6卷 1029-1035页

作者： Yu-chun Chen Zhen lian Yan-Na Lin Xin-Jia wang Guan-Feng Yao Department of Orthopedics the Second Affiliated Hospital Shantou University Medical College Department of Rehabilitation Shantou Central Hospital

BACKGROUND A floating shoulder may be associated with catastrophic neurovascular injury and requires a multidisciplinary approach for its management. To maximize the like-lihood of good patient outcomes, this unique injury pattern should be recognized in patients as early as possible. This can be difficult to achieve, however, as there are currently few reports of floating shoulder in the literature, meaning that associated neurovascular injuries may be *** SUMMARY We present here a rare case of floating shoulder with axillary artery injury in a 34 -year-old woman. The patient complained of pain and numbness of her left upper limb after losing control of her motorcycle on a highway and falling from the vehicle 2 h ago. No blood pressure reading could be obtained from her left upper limb and no blood oxygen readings could be obtained from any of her left fingers. Computed tomography angiography and duplex ultrasonography revealed interruption of blood flow through the axillary artery, with distal flow being maintained through collateral arteries. The clinical diagnosis including fracture of the left proximal humerus, the left clavicle, and the left scapula, left axillary artery rupture, and left brachial plexus injury. We successfully performed open reduction and internal fixation of the fracture and vascular repair. The patient showed satisfactory recovery that was observed during 4 -mo *** Emergency surgery can be an effective therapeutic option for the closed floating shoulder with catastrophic axillary artery injury.

关键词： Floating shoulder injury Axillary artery injury Brachial plexus injury Complications of floating shoulder Management of floating shoulder Clavicle fracture Case report

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Silk damping in scalar-induced gravitational waves: a novel probe for new physics

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 79-85页

作者： Yan-Heng Yu Sai wang Theoretical Physics Division Institute of High Energy Physics Chinese Academy of Sciences School of Physics University of Chinese Academy of Sciences

Silk damping is well known in the study of cosmic microwave background（CMB） and accounts for suppression of the angular power spectrum of CMB on large angular multipoles. In this article, we study the effect of Silk damping on the scalar-induced gravitational waves（SIGWs）. Resulting from the dissipation of cosmic fluid, the Silk damping notably suppresses the energydensity spectrum of SIGWs on scales comparable to a diffusion scale at the decoupling time of weakly-interacting particles. The effect offers a novel observable for probing the underlying particle interaction, especially for those mediated by heavy gauge bosons beyond the standard model of particles. We anticipate that pulsar timing arrays are sensitive to gauge bosons with mass ～10～3-10～4 GeV, while space-and ground-based interferometers to those with mass ～10～7-1012GeV, leading to essential complements to on-going and future experiments of high-energy physics.

关键词： scalar-induced gravitational waves Silk damping new physics

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Problems, challenges and future of plant disease management: from an ecological point of view

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Journal of Integrative Agriculture 2016年第4期15卷 705-715页

作者： HE Dun-chun ZHAN Jia-sui XIE lian-hui Fujian Key Lab of Plant Virology Institute of Plant Virology Fujian Agriculture and Forestry University Key Lab for Biopesticide and Chemical Biology Ministry of EducationFujian Agriculture and Forestry University

Plant disease management faces ever-growing challenges due to：（i） increasing demands for total, safe and diverse foods to support the booming global population and its improving living standards; （ii） reducing production potential in agriculture due to competition for land in fertile areas and exhaustion of marginal arable lands; （iii） deteriorating ecology of agro-ecosystems and depletion of natural resources; and （iv） increased risk of disease epidemics resulting from agricultural intensification and monocultures. Future plant disease management should aim to strengthen food security for a stable society while simultaneously safeguarding the health of associated ecosystems and reducing dependency on natural resources. To achieve these multiple functionalities, sustainable plant disease management should place emphases on rational adaptation of resistance, avoidance, elimination and remediation strategies individually and collectively, guided by traits of specific host-pathogen associations using evolutionary ecology principles to create environmental （biotic and abiotic） conditions favorable for host growth and development while adverse to pathogen reproduction and evolution.

关键词： disease resistance avoidance elimination and remediation ecological plant disease management evolutionaryprinciple food security plant disease economy

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大麻二酚对转化生长因子β1诱导肝星状细胞活化和肝纤维化的作用

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中国组织工程研究 2025年第23期29卷 4965-4974页

作者：王联谢娜赵珮伶陈浩李芏酉王豫萍贵州医科大学附属医院临床检验中心贵州省贵阳市550003 贵州医科大学医学检验学院临床微生物学及免疫学教研室贵州省贵阳市550004

背景:大麻二酚具有抗炎、抗氧化等药理学作用,并且不具有精神活性,在肝脏疾病中的研究日渐增加,但其对肝星状细胞转化生长因子β1/Smad信号转导通路的作用尚未明确。目的:探讨大麻二酚对肝星状细胞中转化生长因子β1/Smad信号转导通路... 详细信息

背景:大麻二酚具有抗炎、抗氧化等药理学作用,并且不具有精神活性,在肝脏疾病中的研究日渐增加,但其对肝星状细胞转化生长因子β1/Smad信号转导通路的作用尚未明确。目的:探讨大麻二酚对肝星状细胞中转化生长因子β1/Smad信号转导通路的影响,研究其抗肝纤维化的可能机制。方法:(1)体外实验:选取大鼠肝星状细胞株(HSC-T6),分6组培养:对照组常规培养24 h,单纯药物组加入大麻二酚培养24 h,造模组加入转化生长因子β1培养24 h,造模+低剂量药物组、造模+高剂量药物组、造模+阳性对照组均加入转化生长因子β1培养24 h后分别加入1,5μmol/L大麻二酚或水飞蓟素培养24 h。培养结束后,检测各组细胞α-平滑肌肌动蛋白与Ⅰ型胶原mRNA表达、白细胞介素1β与肿瘤坏死因子α水平及Ⅰ型胶原、转化生长因子β1/Smad信号转导通路蛋白表达。(2)动物体内实验:将C57BL/6J小鼠随机分为5组,每组8只:假手术组不造模,造模组、造模+低剂量药物组、造模+高剂量药物组、造模+阳性对照组通过胆管结扎法建立肝纤维化模型,造模3周后分别腹腔注射4,8 mg/kg大麻二酚或水飞蓟素,1次/d,连续给药7 d。给药结束后,检测各组小鼠肝功能、肝脏病理形态及α-平滑肌肌动蛋白、Ⅰ型胶原、转化生长因子β1/Smad信号转导通路相关蛋白表达。结果与结论:(1)体外实验:与对照组比较,造模组HSC-T6细胞α-平滑肌肌动蛋白与Ⅰ型胶原mRNA表达、白细胞介素1β与肿瘤坏死因子α水平以及Ⅰ型胶原、转化生长因子β1、p-Smad2/3蛋白表达均升高(P<0.05),Smad7蛋白表达降低(P<0.05);两种剂量大麻二酚处理可改善转化生长因子β1诱导的HSC-T6细胞上述指标的变化,并且以造模+高剂量药物组改善作用更明显;(2)体内实验:与假手术组比较,模型组小鼠血清丙氨酸氨基转移酶、天门冬氨酸氨基转移酶活性升高(P<0.05),肝组织中炎性细胞浸润及胶原含量增加(P<0.05),转化生长因子β1/Smad信号转导通路被激活,α-平滑肌肌动蛋白、Ⅰ型胶原蛋白表达升高(P<0.05);两种剂量大麻二酚干预可减轻造模小鼠上述指标的变化,并且以造模+高剂量药物组效果更明显;(3)结果表明,大麻二酚通过抑制肝星状细胞转化生长因子β1/Smad信号传导通路的激活抑制肝纤维化。

关键词：大麻二酚肝星状细胞肝纤维化信号转导通路转化生长因子β1/Smad HSC-T6细胞

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A surface engineering strategy for the stabilization of zinc metal anodes with montmorillonite layers toward long-life rechargeable aqueous zinc ion batteries

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Journal of Energy Chemistry 2025年第1期100卷 94-105页

作者： Wenbo wang Ruifeng Xu Xu Zhang Peiyu wang Bao Yang Bingjun Yang Juan Yang Kailimai Su Pengjun Ma Yanan Deng Xianfeng Fan Wanjun Chen Key Laboratory for Electronic Materials College of Electrical Engineering Northwest Minzu University Resource Chemistry and Energy Materials Research Center State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Institute for Materials and Processes School of Engineering University of Edinburgh

Rechargeable aqueous zinc-ion batteries （AZIBs） exhibit appreciable potential in the domain of electrochemical energy ***,there are serious challenges for AZIBs,for instance zinc dendrite growth,hydrogen evolution reaction （HER）,and corrosion side ***,we propose a surface engineering modification strategy for coating the montmorillonite （MMT） layer onto the surface of the Zn anode to tackle these issues,thereby achieving high cycling stability for rechargeable *** results reveal that the MMT layer on the surface of the Zn anode is able to provide ordered zincophilic channels for zinc ions migration,facilitating the reaction kinetics of zinc *** functional theory（DFT） calculations and water contact angle （CA） tests prove that MMT@Zn anode exhibits superior adsorption capacity for Zn2+and better hydrophobicity than the bare Zn anode,thereby achieving excellent cycling ***,the MMT@Zn||MMT@Zn symmetric cell holds the stable cycling over 5600 h at 0.5 mA cm-2and 0.125 m A h cm-2,even exceeding 1800 h long cycling under harsh conditions of 5 m A cm-2and 1.25 m A h *** MMT@Zn||V2O5full cell reaches over 3000 cycles at 2 A g-1with excellent rate ***,this surface engineering modification strategy for enhancing the electrochemical performance of AZIBs represents a promising application.

关键词： Surface engineering strategy Montmorillonite layer Protection mechanism of Zn anode Cycling stability Aqueous zinc ion batteries

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Dynamical complexity of Anosov systems driven by a quasi-periodic force

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Science China Mathematics 2025年第1期 89-136页

作者： Wen Huang Zeng lian Kening Lu Department of Mathematics University of Science and Technology of China School of Mathematics Sichuan University

Consider C2Anosov systems on a compact manifold driven by a quasi-periodic *** study their dynamical complexity on various levels from the perspectives of both path-wise dynamics and stochastic *** that these systems are non-wandering（i.e.,every point in the phase space is nonwandering）,we prove a set of results:（1） the existence of abundance of random periodic points;（2） a random Liv?ic theorem;（3） a random Ma?é-Bousch-Conze-Guivarc'h lemma;（4） the existence of strong random ***,a concrete example constructed on a 2-dimensional torus is also given to uncover some interesting phenomena of the systems.

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Effect of annealing time on microstructure and mechanical properties of cryorolled AISI 310S stainless steel

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Journal of Iron and Steel Research International 2023年第3期30卷 548-556页

作者： Xue-kui lian Yong Li Yi Xiong Yong-li Wu Shun Han Tian-tian He chun-xu wang Feng-zhang Ren Central Iron and Steel Research Institute Co. Ltd.Beijing 100081China School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang 471023HenanChina Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology Luoyang 471023HenanChina

AISI 310S stable austenitic stainless steel was subjected to 90%cryorolling and then annealed at 800 ℃ for 2-60 *** effect of annealing time on the microstructure and mechanical properties was studied by optical microscopy,scanning electron microscopy,transmission electron microscopy,microhardness and tensile *** results show that the grain size of AISI 310S stainless steel is refined to the nanometer level after 90%cryorolling,and the grain size is approximately 20 *** the increase in annealing time,the degree of grain recrystallization occurs more fully and completely,as the grain begins to grow and then tends to *** strength and hardness of the annealed specimens decrease with increasing annealing time,while elongation tends to *** the annealing time is 10 min,the yield strength increases by about 2 times compared to that of the original austenite(unrolled),and the elongation is also above 20%,which is the best preparation process for ultra-fine grain austenitic stainless steel under this experimental *** the annealing time treatment increases,the fracture morphology changes from mixed quasi-cleavage and ductile fracture(after cryorolling)to ductile fracture(after annealing).

关键词： Austenitic stainless steel Cryorolling Annealing time Microstructure Mechanical property

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Analysis of China's Haze Days in the Winter Half-Year and the Climatic Background during 1961–2012

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Advances in Climate Change Research 2014年第1期5卷 1-6页

作者： SONG lian-chun GAO Rong LI Ying wang Guo-Fu National Climate Center China Meteorological Administration Laboratory for Climate Studies China Meteorological Administration

The characteristics of haze days and the climatic background are analyzed by using daily observations of haze,precipitation,mean and maximum wind speed of 664 meteorological stations for the period of 1961–*** results show that haze days occur significantly more often in eastern China than in western *** annual number of haze days is 5–30 d in most parts of central-eastern China,with some areas experiencing more than 30 d,while less than 5 d are averagely occurring in western *** days are mainly concentrated in the winter half-year,with most in winter,followed by autumn,spring,and then *** 20%of annual haze days are experienced in *** haze days in central-eastern China in the winter half-year have a significant increasing trend of 1.7 d per decade during 1961–*** were great increases in haze days in the 1960s,1970s and the beginning of the 21st *** was also significant abrupt changes of haze days in the early 1970s and *** 1961 to 2012,haze days in the winter half-year increased in South China,the middle-lower reaches of the Yangtze River,and North China,but decreased in Northeast China,eastern Northwest China and eastern Southwest *** number of persistent haze is *** Longer the haze,the greater the proportion to the number persistent *** climatic conditions exacerbated the occurrence of *** correlation coefficient between haze days and precipitation days in the winter half-year is mainly negative in central-eastern *** precipitation days show a decreasing trend in most parts of China,with a rate of around–4.0 d per decade in central-eastern China,which reduces the sedimentation capacity of atmospheric *** the period of 1961–2012,the correlation coefficients between haze days and mean wind speed and strong wind days are mainly negative in central-eastern China,while there exists positive correlation between haze days and breeze days in the winter ***

关键词： haze winter half-year precipitation days wind speed

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