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Design of distributed dynamic absorbers for vibration suppression of panel structures

Acta Mechanica Sinica 2024年第7期40卷 164-180页

作者： liyuan li Bin li Zehua Xu School of Aeronautics Northwestern Polytechnical UniversityXi'an 710072China China Aero-Polytechnology Establishment Beijing 100028China

Distributed dynamic absorbers have many advantages such as wide frequency bandwidth for vibration suppression,strong detuning adaptability,and high system stability,making them very suitable for the vibration and noise control of continuous ***,they have broad application prospects in various fields such as transportation,aviation,and ***,there are still many challenges in the engineering applications of distributed dynamic absorbers for vibration suppression,including the engineering realization of the optimal damping of traditional optimal coherence dynamic absorbers,and the engineering applicability of the finite periodic array dynamic *** on the damping material properties obtained by the dynamic mechanical analyzer tests,this paper establishes the finite element model of the cantilever-beam-type dynamic absorber with constrained damping layers,aiming to realize the accurate determination of the optimal *** are conducted by attaching the traditional dynamic absorbers with the optimal damping to a thin-walled panel with four clamped *** show that the vibration of the panel is well suppressed,with the reduction of the frequency response peak larger than 14 dB and the reduction ratio of RMS larger than 58%within 500 ***,the periodically arrayed dynamic absorbers are designed according to the bandgap regulation *** tuning behavior of the arrayed dynamic absorbers by changing designing parameters is *** vibration reduction effect of arrayed dynamic absorbers is compared with that of the traditional dynamic absorbers under the same mass ratio through *** indicate that the arrayed dynamic absorbers are easier to design,and have a similar reduction effect on the modal vibration of the thin panel as the traditional dynamic absorbers within a narrow frequency range near the natural frequency,while they perform unsatisfactory in a broad ***,if t

关键词： Distributed dynamic absorbers Engineering realization of the optimal damping Vibration suppression Low-frequency and broadband

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A Web-like Three-dimensional Binder for Silicon Anode in lithium-ion Batteries

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Energy & Environmental Materials 2024年第1期7卷 21-27页

作者： liyuan li Tao li Yifan Sha Baozeng Ren Lan Zhang Suojiang Zhang CAS Key Laboratory of Green Process and Engineering Beijing Key Laboratory of Ionic Liquids Clean ProcessState Key Laboratory of Multiphase Complex SystemsInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China Langfang Green Industrial Technology Center Langfang 065001China Henan Key Laboratory of Energy Storage Materials and Processes Zhengzhou Institute of Emerging Industrial TechnologyZhengzhou 450003China

Si anode is of paramount importance for advanced energy-dense lithium-ion batteries(liBs).However,the large volume change as well as stress generates during its lithiation-delithiation process poses a great challenge to the long-term cycling and hindering its *** this work,a composite binder is prepared with a soft component,guar gum(GG),and a rigid linear polymer,anionic polyacrylamide(APAM).Rich hydroxy,carboxyl,and amide groups on the polymer chains not only enable intermolecular crosslinking to form a web-like binder,A2G1,but also realize strong chemical binding as well as physical encapsulating to Si *** resultant electrode shows limited thickness change of merely 9%on lithiation and almost recovers its original thickness on *** demonstrates high reversible capacity of 2104.3 mAh g^(-1)after 100 cycles at a current density of 1800 mA g^(-1),and in constant capacity(1000 mAh g^(-1))test,it also shows a long life of 392 ***,this soft-hard combining web-like binder illustrates its great potential in the future applications.

关键词： anionic polyacrylamide lithium-ion batteries Si anode thickness change web-like binder

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Determination of multilevel chirality in nickel molybdate films by electron crystallography

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Nano Research 2024年第9期17卷 8571-8577页

作者： Jing Ai Yu Wang liyuan li Jianqiang Wang Te Bai Shunai Che Lu Han Sinopec(Shanghai)Research Institute of Petrochemical Technology Co. Ltd.Shanghai 201208China School of Chemical Science and Engineering Tongji UniversityShanghai 200092China School of Chemistry and Chemical Engineering State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong UniversityShanghai 200240China

Chiral inorganic materials have attracted great attention owning to their unique physical and chemical properties attributed to the symmetry-breaking of their *** inorganic materials can be endowed with chiral geometric configurations from achiral space group crystals through lattice twisting,screw dislocations or hierarchical self-assembled spiral morphologies,showing various characteristic chiral ***,the multilevel chirality in chiral nickel molybdate films(CNMFs)remains to be elaborately *** this paper,we report three hierarchical levels of chirality in CNMFs,spanning from the atomic to the micron scale,including primary helically coiled nanoflakes with twisted atomic crystal lattices,secondary helical stacking of layered nanoflakes,and tertiary asymmetric morphology between adjacent *** findings may enrich the chiral self-assembly structural types and provide valuable insights for the comprehensive analysis path of hierarchical chiral crystals.

关键词： chiral inorganic material nickel molybdate structural analysis transmission electron microscopy electron crystallography

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Effects of Polygala fallax Hemsl Water Extract on a Mouse Model of Gastric Motility Disorders

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Medicinal Plant 2024年第4期15卷 101-106页

作者： liangyin ZHU Xiaofeng HAO liuqi HUANG Zongyuan CHEN Wenfeng CHEN liu YANG Bingchen HUANG liyuan li Aipeng li Suoyi HUANG Xiuzhen SU School of Clinical Medicine Youjiang Medical University for NationalitiesBaise 533000China Key Laboratory of Guangxi Universities on National Medicine in Youjiang River Youjiang Medical University for NationalitiesBaise 533000China School of Pharmacy Youjiang Medical University for NationalitiesBaise 533000China Institute of life Sciences Youjiang Medical University for NationalitiesBaise 533000China

[Objectives]To explore the effects of Polygona fallax Hemsl water extract on gastrointestinal motility in normal mice and gastric motility disorder model mice and approximate mechanism.[Methods]Using normal mice and mice with gastric motility disorders(modeled with atropine),the effects of different mass concentration groups of *** Hemsl water extract(0.125,0.250,0.500 g/mL)and domperidone groups on gastric residual rate,small intestine propulsion rate,serum motilin(MLT),vasoactive intestinal peptide(VIP),and tissue morphology were studied.[Results]There was a highly significant difference(Pliquid in normal mice among the different concentration groups of *** Hemsl water extract compared to the blank *** small intestine propulsion rate and gastric residue rate of semi-solid paste were statistically significant compared to the blank group(Pliquid and semi-solid paste in mice with gastric motility disorders were statistically significant compared to the atropine group,with extremely significant differences(Plity in normal mice may be related to the content of MLT in mouse *** mechanism of action in atropine induced gastric paresis mice may be related to the reactivation of M receptors,and the action mechanism of *** Hemsl d

关键词： Polygala fallax Hemsl Gastric motility Mouse model Gastric emptying Gastric paresis Motilin Vasoactive intestinal peptide

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Screening for Anti-tumor Activity of Fractions from Buddleja officinalis Maxim

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Medicinal Plant 2024年第2期15卷 48-50,56页

作者： Tong li Xin XIE liyuan li Aipeng li Zhidong LEI Tingting HE Sirui MO Shangfeng HUANG Yao liN Suoyi HUANG lixiang LU Shiyou ZHOU School of Basic Medical Sciences Youjiang Medical University for NationalitiesBaise 533000China Key Laboratory of Characteristic Ethnic Medicine Research in Youjiang Basin Youjiang Medical University for NationalitiesBaise 533000China School of Pharmacy Youjiang Medical University for NationalitiesBaise 533000China School of Clinical Medicine Youjiang Medical University for NationalitiesBaise 533000China

[Objectives]The anti-tumor activity of fractions from Buddleja officinalis *** petroleum ether,ethyl acetate,n-butanol and water solvent was studied.[Methods]The ethanol extract from *** *** extracted and then concentrated with petroleum ether,ethyl acetate,n-butanol and water,respectively,and the extracts were *** inhibitory effects of the four different fractions on the growth of three tumor cell lines in vitro were detected by CCK-8 method,and the median inhibitory concentration(IC 50 value)was calculated.[Results]The four fractions inhibited the growth of the three tumor cell lines in vitro,among which the n-butanol fraction had the best anti-tumor *** IC 50 values of the n-butanol fraction on human gastric cancer(SGC-7901),human breast cancer(MCF-7)and human liver cancer(BEL-7404)cell lines were 0.08,1.58 and 0.12 mg/mL,respectively.[Conclusions]Petroleum ether,ethyl acetate,n-butanol and water fractions from the ethanol extract of *** *** certain anti-tumor effects,and the n-butanol fraction had the best anti-tumor activity.

关键词： Buddleja officinalis Maxim. Tumor cells Anti-tumor Activity screening

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异种材料不锈钢和铝合金焊接技术分析及应用

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现代工程科技 2024年第9期3卷 13-16页

作者：李利元广西建工集团第一安装工程有限公司广西南宁530020

不锈钢和铝合金作为两种常用的金属材料,由于其特殊的物理和化学性质,在工程和制造领域中得到了广泛的应用。然而,由于两种材料的性质差异,其焊接技术一直是一个具有挑战性的问题。对不锈钢和铝合金焊接技术进行深入分析,并探讨其在工... 详细信息

不锈钢和铝合金作为两种常用的金属材料,由于其特殊的物理和化学性质,在工程和制造领域中得到了广泛的应用。然而,由于两种材料的性质差异,其焊接技术一直是一个具有挑战性的问题。对不锈钢和铝合金焊接技术进行深入分析,并探讨其在工程实践中的应用,以期为相关行业的工程师和研究人员提供有益的参考和借鉴。

关键词：异种材料不锈钢铝合金焊接技术

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药房中药饮片处方用药在临床中的应用分析

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中华灾害救援医学 2024年第6期11卷 724-726,742页

作者：李丽园晋江市医院(上海市第六人民医院福建医院)药学部福建晋江362261

目的通过分析晋江市医院药房的中药饮片的2100张处方,提高中药饮片处方质量,强化中药饮片使用的合理性。方法选取2023年1月至2023年12月晋江市医院药房的中药饮片处方,随机抽取2100张,分析其基本使用情况及不合格中药饮片处方原因。结... 详细信息

目的通过分析晋江市医院药房的中药饮片的2100张处方,提高中药饮片处方质量,强化中药饮片使用的合理性。方法选取2023年1月至2023年12月晋江市医院药房的中药饮片处方,随机抽取2100张,分析其基本使用情况及不合格中药饮片处方原因。结果排名前三的疾病为消化系统(631张,30.05%)、肿瘤类(447张,21.29%)和心血管系统疾病(299张,14.24%);患者年龄分布最多为51~65岁(644张,30.67%),其次为66~80岁(436张,20.76%);女性占58.90%,高于男性的41.10%。使用11~20味中药的处方697张,占比最高(33.19%);其次为使用2~10味中药的处方,为624张(29.71%);使用单味中药的处方有51张,占比最低(2.43%)。2100张处方中,不合格的处方有386张,占所抽查处方的18.38%。其中,临床诊断不规范140张(6.67%);书写不规范219张(10.40%);使用方法不当27张(1.29%)。使用中药饮片中存在单味中药超量及使用毒性药物的不合理性。其中,用药超量处方有186张(8.86%),使用含毒饮片处方有363张(17.29%),毒性药物超正常剂量处方有154张(7.33%)。结论我院药房中药饮片处方使用量较大,药物整体使用合理,但也存在一些药物不合理使用的情况,临床应进一步加强管理,保障中药饮片处方的规范化。

关键词：中药饮片处方规范化

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正交实验优化草果果胶的提取工艺

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化学与生物工程 2024年第1期41卷 36-39页

作者：谢欣李丽媛李童陈小妮黄锁义右江民族医学院基础医学院广西百色533000 右江民族医学院药学院广西百色533000 右江民族医学院广西高校右江流域特色民族药研究重点实验室广西百色533000

采用传统的酸水解乙醇沉淀法提取草果果胶,以草果果胶得率为评价指标,在单因素实验的基础上,通过L_(9)(3^(4))正交实验优化了草果果胶的提取工艺。结果表明,各因素对草果果胶得率影响的大小顺序为:pH值>料液比>提取时间>提取温度;最佳... 详细信息

采用传统的酸水解乙醇沉淀法提取草果果胶,以草果果胶得率为评价指标,在单因素实验的基础上,通过L_(9)(3^(4))正交实验优化了草果果胶的提取工艺。结果表明,各因素对草果果胶得率影响的大小顺序为:pH值>料液比>提取时间>提取温度;最佳提取工艺为:pH值3.0、提取温度90℃、提取时间150 min、料液比1∶30(g∶mL),在此条件下,果胶得率为7.54%,为进一步深入开发草果资源提供了科学依据。

关键词：草果果胶提取工艺单因素实验正交实验

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市政道路桥梁工程沉降段路基路面施工技术

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大众科学 2024年第6期45卷 107-109页

作者：李凯周鑫李立源济南金曰公路工程有限公司山东济南250100

市政道路桥梁施工,能够缩小城市的空间距离,满足人们不断变化的出行需求,使城市规划更具科学性、适用性、便民性等特征。基于此,将着重探讨市政道路桥梁工程沉降段的路基路面施工技术,希望可以为其他的施工人员提供有效参考,使市政道路... 详细信息

市政道路桥梁施工,能够缩小城市的空间距离,满足人们不断变化的出行需求,使城市规划更具科学性、适用性、便民性等特征。基于此,将着重探讨市政道路桥梁工程沉降段的路基路面施工技术,希望可以为其他的施工人员提供有效参考,使市政道路桥梁工程项目的施工设计得到优化,建设出富有弹性且更加耐用的交通网络,造福于整个社会。

关键词：市政道路桥梁工程沉降段路基路面施工技术

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风险评估对道路桥梁安全管理的影响分析

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大众科学 2024年第6期45卷 120-122页

作者：李立源李凯周鑫济南金日公路工程有限公司山东济南250100

遵循风险评估的基本原理,将风险评估合理纳入道路桥梁安全管理工作当中,可以准确识别潜在风险,从而更好地缓解潜在风险,在维护、检查和资源分配方面做出明智的决策。着重分析风险评估的主要目的和关键步骤,结合风险评估对道路桥梁安全... 详细信息

遵循风险评估的基本原理,将风险评估合理纳入道路桥梁安全管理工作当中,可以准确识别潜在风险,从而更好地缓解潜在风险,在维护、检查和资源分配方面做出明智的决策。着重分析风险评估的主要目的和关键步骤,结合风险评估对道路桥梁安全管理的影响,简要总结研究一些有效的风险评估策略,希望可以为道路桥梁安全管理的工作人员提供有效参考。

关键词：风险评估道路桥梁安全管理影响

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