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Gradient microstructure and superior strength-ductility synergy of AZ61 magnesium alloy bars processed by radial forging with different deformation temperatures

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Journal of Materials Science & Technology 2024年第3期170卷 65-77页

作者： Jingfeng Zou Lifeng Ma Yanchun Zhu ling qin Yuan Yuan School of Mechanical Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Heavy Machinery Engineering Research Center of the Ministry Education Taiyuan University of Science and TechnologyTaiyuan 030024China Department of Engineering University of HullCottingham RdHull HU67RXUK National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China

Gradient microstructure modification is a cost-efficient strategy for high strength without compromising ductility,which is urgently needed in the fundamental science of engineering *** this study,heterogeneous structures of AZ61 alloy bars with anisotropic gradients(with different grain size distributions from the surface to the center)were observed to exhibit strong strength-ductility synergies under different deformation tem *** results reveal that the grain refinement process under mediumlow temperature deformation conditions(≤350℃)consists of four transition stages along the radial direction,i.e.,twin activations and deformation band formations,dislocation cells and pile-ups,ultrafine sub-grains,and randomly orientated quasi-micron *** deformation temperatures have a great influence on twin activations and deformation band formations,and the high temperature can easily provoke the initiation of non-basal *** deformation bands were determined as a primary nucleation site due to their highly unstable dislocation hindrance *** in combination with the Radial forging(RF)deformation process,the differences of dynamic precipitates can be attributed to microstructural difference and solubility limit of Al at different tem *** summarizing the tensile test results,the sample forged at 350℃exhibited the best strength-ductility synergy,exhibiting the highest elongation(EL)of 23.2%with a 251 MPa yield strength(YS)and 394 MPa ultimate tensile strength(UTS)in center region,and combined with the highest strength value of 256 MPa YS and 420 MPa UTS in the center region,while the EL was slightly degraded to 19.8%.

关键词： Gradient microstructure Radial forging Strength-ductility synergy Magnesium alloy Strengthening mechanism

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Research on the MPPT of Photovoltaic Power Generation Based on Improved WOA and P&O under Partial Shading Conditions

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Energy Engineering 2024年第4期121卷 951-971页

作者： Jian Zhong Lei Zhang ling qin School of Electrical Engineering Nantong UniversityNantong226019China

Partial shading conditions(PSCs)caused by uneven illumination become one of the most common problems in photovoltaic(PV)systems,which can make the PV power-voltage(P-V)characteristics curve show *** maximum power point tracking(MPPT)methods have shortcomings in tracking to the global maximum power point(GMPP),resulting in a dramatic decrease in output *** order to solve the above problems,intelligent algorithms are used in ***,the existing intelligent algorithms have some disadvantages,such as slow convergence speed and large search ***,an improved whale algorithm(IWOA)combined with the P&O(IWOA-P&O)is proposed for the MPPT of PV power generation in this ***,IWOA is used to track the range interval of the GMPP,and then P&O is used to accurately find the MPP in that *** with other algorithms,simulation results show that this method has an average tracking efficiency of 99.79%and an average tracking time of 0.16 s when tracking ***,experimental verification is conducted,and the results show that the proposed algorithm has better MPPT performance compared to popular particle swarm optimization(PSO)and PSO-P&O algorithms.

关键词： Photovoltaic power generation maximum power point tracking whale algorithm perturbation and observation

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Effects of the fertilizer and water management on amino acids and volatile components in Cabernet Sauvignon grapes and wines

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International Journal of Agricultural and Biological Engineering 2024年第1期17卷 69-79页

作者： Kui Zhang Wenhuai Kang Weihua Han Haijun Ma Daozhi Gong ling qin College of Food Science and Biology Hebei University of Science and TechnologyShijiazhuang 050018China Institute of Environment and Sustainable Development in Agriculture Chinese Academy of Agricultural SciencesBeijing 100081China College of Biological Science and Engineering North Minzu UniversityYinchuan 750021China

The amino acids and the volatile substances in grapes and wines play important roles in their quality,and the concentrations of these substances can be changed by how a vineyard is managed,e.g.,irrigation and fertigation *** study aimed to evaluate the effect of fertilizer and water management on the distribution of amino acids,the volatile component profiles,and the sensory characteristics of Cabernet Sauvignon grapes and *** results showed that the amino acid concentration in grape berries was the highest under the 100%local fertilizer rate(HF)and 100%water irrigation quota(HW)treatment,and the volatile component concentration in wine was the highest under HF and 80%water irrigation quota(MW)*** effect of irrigation on the amino acid content in grapes was greater than that of *** synergistic effect of fertilizer and water on arginine,serine,and glutamine in grape berries was *** interactive effect of fertigation and irrigation on the volatile substance in grapes was greater than that of fertigation and irrigation *** influence of irrigation on volatile substances in wines was greater than that of *** addition,there was also a correlation between the concentrations of multiple amino acids in grapes and volatile components in *** component analysis showed that the wine from the HFMW treatment had the best quality among all treatments.

关键词： fertilizer and water management grape ine amino acids volatile components

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ADAM8 inactivation retards intervertebral disc degeneration in mice

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Genes & Diseases 2024年第3期11卷 91-94页

作者： Zuozhen Tian Frances S.Shofer Mingyue Fan Alec Z.Sandroni Lutian Yao Lin Han ling qin Motomi Enomoto-lwamoto Yejia Zhang Department of Physical Medicine&Rehabilitation Perelman School of MedicineUniversity of PennsylvaniaPhiladelphiaPA19146USA Department of Emergency Medicine Perelman School of MedicineUniversity of PennsylvaniaPhiladelphiaPA 19104USA Department of Orthopedic Surgery Perelman School of MedicineUniversity of PennsylvaniaPhiladelphiaPA 19104USA School of Biomedical Engineering Science&Health SystemsDrexel UniversityPhiladelphiaPA 19104USA Department of Orthopedics/Sports Medicine and Joint Surgery the First Hospital of China Medical UniversityShenyangLiaoning 110001China Department of Orthopedics University of Maryland School ofMedicineBaltimoreMD21201USA Section of Rehabilitation Medicine Corporal Michael J.Crescenz Veterans Affairs Medical CenterPhiladelphiaPA 19104USA

ADAM8 has been identified as the fibronectin-cleaving enzyme in human degenerative intervertebral disc(IVD)tissues.^(1)Increase of the active form of ADAM8 and its cleavage product,fibronectin fragment,correlated with an increased degree of IVD degeneration.1 Furthermore,fibronectin fragments have been shown to accelerate the progression of IVD degeneration.^(2)These findings suggest that ADAM8 may play a role in degenerative disc disease,a clinical problem with tremendous socioeconomic burdens in the United States.

关键词： ADAM8 degeneration intervertebral

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链转移剂胶束调控可逆失活-断裂链转移聚合物的分散度

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高分子学报 2024年第1期55卷 67-78页

作者：覃小玲安泽胜吉林大学化学学院超分子结构与材料国家重点实验室长春130012

聚合物的分子量和分子量分布(分散度)是决定聚合物性能的重要参数.目前通过聚合调控分散度的方法大都针对有机溶液聚合体系,缺乏有特色的在水相聚合体系中调控分散度的方法 .本文中提出一种链转移剂胶束调控聚合物分散度的新方法 .选用... 详细信息

聚合物的分子量和分子量分布(分散度)是决定聚合物性能的重要参数.目前通过聚合调控分散度的方法大都针对有机溶液聚合体系,缺乏有特色的在水相聚合体系中调控分散度的方法 .本文中提出一种链转移剂胶束调控聚合物分散度的新方法 .选用葡萄糖氧化酶(GOx)除氧-氧化还原引发可逆失活-断裂链转移(RAFT)聚合方法,利用双亲性链转移剂在水溶液中存在的游离分子与胶束的热力学平衡,实现对聚合物分散度的调控.通过监测聚合过程中链转移剂胶束的变化,证实了链转移剂胶束对分散度调控的重要作用.研究了溶液的pH、添加剂,包括电解质、表面活性剂和助表面活性剂对聚合物分散度的影响.通过“一锅法”成功合成嵌段共聚物,验证了宽分散度的聚合物同样具有高的链端保真度.

关键词：分散度分子量分布可逆失活-断裂链转移聚合链转移剂胶束

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High formability Mg-Zn-Gd wire facilitates ACL reconstruction via its swift degradation to accelerate intra-tunnel endochondral ossification

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Journal of Magnesium and Alloys 2024年第1期12卷 295-315页

作者： Xuan He Ye Li Hongwei Miao Jiankun Xu Michael Tim-yun Ong Chenmin Wang Lizhen Zheng Jiali Wang Le Huang Haiyue Zu Zhi Yao Jie Mi Bingyang Dai Xu Li Patrick Shu-hang Yung Guangyin Yuan ling qin Musculoskeletal Research Laboratory of Department of Orthopaedics&Traumatology and Innovative Orthopaedic Biomaterial and Drug Translational Research Laboratory of Li Ka Shing Institute of Health Sciences The Chinese University of Hong KongHong KongChina National Engineering Research Center of Light Alloy Net Forming School of Materials Science&EngineeringShanghai Jiao Tong UniversityShanghaiChina Department of Orthopaedics and Traumatology Li Ka Shing Faculty of MedicineThe University of Hong KongHong KongChina Orthopaedic Department Peking University Third HospitalBeijingChina Department of Rehabilitation Sciences The Hong Kong Polytechnic UniversityHong KongChina

After reconstructing the anterior cruciate ligament(ACL),unsatisfactory bone tendon interface healing may often induce tunnel enlargement at the early healing *** good biological features and high formability,Magnesium-Zinc-Gadolinium(ZG21)wires are developed to bunch the tendon graft for matching the bone tunnel during ***,tensile strength,degradation,and cytotoxicity of ZG21 wire are *** rabbit model is used for assessing the biological effects of ZG21 wire by Micro-CT,histology,and mechanical *** SEM/EDS,immunochemistry,and in vitro assessments are performed to investigate the underlying *** tests demonstrate the high formability of ZG21 wire as surgical ***-CT shows ZG21 wire degradation accelerates tunnel bone formation,and histologically with earlier and more fibrocartilage regeneration at the healing *** mechanical test shows higher ultimate load in the ZG21 *** SEM/EDS presents ZG21 wire degradation triggered calcium phosphate(Ca-P)*** results demonstrate upregulation of Wnt3a,BMP2,and VEGF at the early phase and TGFβ3 and Type II collagen at the late phase of *** vitro tests also confirmed the Ca-P in the metal extract could elevate the expression of Wnt3a,βcatenin,ocn and opn to stimulate *** vivo tests of clinical samples indicated suturing with ZG21 wire did not weaken the ultimate loading of human tendon *** conclusion,the ZG21 wire is feasible for tendon graft *** degradation products accelerated intra-tunnel endochondral ossification at the early healing stage and therefore enhanced bone-tendon interface healing in ACL reconstruction.

关键词： Magnesium wire ACL reconstruction Magnesium alloy Biomaterials Endochondral ossification

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多囊卵巢综合征内分泌异常的诊治

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中国实用妇科与产科杂志 2024年第6期40卷 608-614页

作者：朱琴玲孙贇上海交通大学医学院附属仁济医院生殖医学中心、上海市辅助生殖与优生重点实验室上海200135

多囊卵巢综合征(polycystic ovary syndrome,PCOS)是女性最常见的、复杂的生殖内分泌紊乱疾病。PCOS患者下丘脑-垂体-卵巢轴功能紊乱,常伴随高雄激素血症及高胰岛素血症等内分泌异常。精准评估PCOS内分泌状态是早发现、早诊断及早治疗... 详细信息

多囊卵巢综合征(polycystic ovary syndrome,PCOS)是女性最常见的、复杂的生殖内分泌紊乱疾病。PCOS患者下丘脑-垂体-卵巢轴功能紊乱,常伴随高雄激素血症及高胰岛素血症等内分泌异常。精准评估PCOS内分泌状态是早发现、早诊断及早治疗相关异常的重要手段。针对内分泌紊乱及女性生育需求等,PCOS患者主要以个体化治疗为主,且该病贯穿于女性全生命周期,需制定系统的、长期的全程管理计划。

关键词：多囊卵巢综合征内分泌异常高雄激素血症

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儿童青少年睡眠障碍的物理治疗研究进展

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中华实用儿科临床杂志 2024年第3期39卷 235-240页

作者：傅燕虹张文柳覃荣山秦岭广西壮族自治区人民医院认知睡眠中心广西医学科学院脑与精神疾病研究所南宁530021 柳州市中医医院儿童康复科柳州545000

睡眠障碍在儿童青少年中非常普遍,在患有神经发育障碍、精神心理疾病等特殊人群中患病率更高,这对儿童青少年睡眠障碍的治疗提出了挑战。儿童青少年睡眠障碍的治疗方法主要包括认知行为治疗、手术治疗、药物治疗及物理治疗。传统的认知... 详细信息

睡眠障碍在儿童青少年中非常普遍,在患有神经发育障碍、精神心理疾病等特殊人群中患病率更高,这对儿童青少年睡眠障碍的治疗提出了挑战。儿童青少年睡眠障碍的治疗方法主要包括认知行为治疗、手术治疗、药物治疗及物理治疗。传统的认知行为治疗费用高、合格的睡眠医师及治疗师数量少、患者依从性低。药物治疗虽然是儿童青少年失眠最常用的治疗方法,但缺少适应证和安全性数据的支持,不良反应多,长期疗效未知。通过磁、电、声、光等物理刺激改变中枢和外周神经活性的物理治疗技术可能为无法获得常规治疗、耐受性差或无效的睡眠障碍个体提供有价值的替代治疗选择或补充治疗方案。现就经颅磁刺激、经颅直流电刺激、光照疗法和高压氧治疗4种临床常见的物理治疗及其在儿童青少年睡眠障碍中的应用进展进行综述,为今后儿童青少年睡眠障碍临床治疗提供科学依据和新思路。

关键词：儿童青少年睡眠睡眠障碍经颅磁刺激经颅直流电刺激光照疗法高压氧治疗

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变形监测灰色预测模型对比及替代方法研究

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大地测量与地球动力学 2024年第4期44卷 382-390页

作者：陈鹏宇秦岭内江师范学院地理与资源科学学院四川省内江市641100

将变形监测灰色预测模型分为传统GM(1,1)模型及其改进模型、非齐次灰色模型、GM(1,1)幂模型及其改进模型3种类型,以Origin拟合函数Exp2PModl、Exponential和SRichards2作为3类灰色预测模型的替代方法,基于理论研究和实例验证对比分析3... 详细信息

将变形监测灰色预测模型分为传统GM(1,1)模型及其改进模型、非齐次灰色模型、GM(1,1)幂模型及其改进模型3种类型,以Origin拟合函数Exp2PModl、Exponential和SRichards2作为3类灰色预测模型的替代方法,基于理论研究和实例验证对比分析3类灰色预测模型及其替代方法。结果表明,3类灰色预测模型在拟合函数、有无极限值、适合等时距或非等时距建模和适用范围等方面存在显著差异,需要根据变形监测数据特征选择合适的灰色预测模型类别;与3类灰色预测模型相比,Origin拟合函数在参数求解和建模数据要求上更具优势,而且可以得到相当甚至更高的拟合或预测精度,除需要编程实现的特殊优化目标外,完全可以代替灰色预测模型用于变形监测。

关键词：变形监测灰色预测模型替代方法 Origin拟合函数

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“一带一路”视域下东南亚地区华文教育探究与实践——以西安文理学院开展国际中文教育为例

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唐都学刊 2024年第2期40卷 62-68页

作者：秦岭西安文理学院文学院西安710065

东南亚华文教育历史悠久,各国华文教育在发展路径上既有共同之处又各有特色。随着共建“一带一路”倡议落地实施,近十年来,泰国、菲律宾、印度尼西亚、越南等国已将汉语教学纳入国民教育体系,鼓励学校积极开展汉语教学,较好地推动了汉... 详细信息

东南亚华文教育历史悠久,各国华文教育在发展路径上既有共同之处又各有特色。随着共建“一带一路”倡议落地实施,近十年来,泰国、菲律宾、印度尼西亚、越南等国已将汉语教学纳入国民教育体系,鼓励学校积极开展汉语教学,较好地推动了汉语传播。在此契机下,西安文理学院抓住机遇,明确办学定位,立足国家和区域发展需求,面向东南亚扩大留学生培养规模,提升留学生培养层次,开展留学生学历教育,把本土教育和国内教育有机融合,助力东南亚国家青年人才培养与发展,开启新时代新模式的汉语人才培养之路。

关键词：东南亚华文教育西安文理学院国际中文教育

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