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多维动力吸振器对复杂悬臂结构减震之应用

航空学报 1982年第3期 42-49页

作者：田千里中国科学院力学研究所

一个复杂悬臂结构在20赫芝附近有两个密接的共振峰,导致结构根部破坏。本文提出了用多维动力吸振器对它进行减震,为了克服通常的调谐吸振器对结构频率十分敏感的缺点,在结构的某一截面上悬挂了六个吸振器,吸振器随着结构沿任意方向振动... 详细信息

一个复杂悬臂结构在20赫芝附近有两个密接的共振峰,导致结构根部破坏。本文提出了用多维动力吸振器对它进行减震,为了克服通常的调谐吸振器对结构频率十分敏感的缺点,在结构的某一截面上悬挂了六个吸振器,吸振器随着结构沿任意方向振动,而且六个吸振器的刚度与阻尼参数可以互不相同,以展宽其吸振频带,为了寻找最优参数和研究这些参数变化时对结构响应之影响,计算了大量的响应曲线,因为结构阻尼很小,吸振器阻尼较大,所以这是一个非比例阻尼的动力分析问题。本文用复特征解法和模态综合法处理了这个问题。

关键词：吸振器基频悬臂结构阻尼参数

Siamese single object tracking algorithm with natural language prior

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Frontiers of Computer Science 2021年第5期15卷 215-216页

作者： qianli ZHOU Rong WANG Jinze LI Naiqian tian Wenjin ZHANG Police Information Engineering and Network Security College People s Public Security University of ChinaBeijing 100038China Beijing Public Security Bureau Beijing 100740China Key Laboratory Of Security Technology and Risk Assessment of Ministry of Public Security Beijing 100038China

1 Introduction Visual tracking has long been considered as a fundamental mission in computer vision,and it has been widely used for many *** trackers[1]utilize Siamese network to do template matching and achieve state-of-the-art performance ***,the Siamese trackers fail to distinguish the target from the distractors with the same category and perform unstably in complicated *** find there are three reasons which affect the robustness and stability of the tracker.

关键词： template computer Visual

Visualizing Complex Anatomical Structure in Bamboo Nodes Based on X-ray Microtomography

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Journal of Renewable Materials 2021年第9期9卷 1531-1540页

作者： Elin Xiang Shumin Yang Chunjie Cao Xinge Liu Guanyun Peng Lili Shang Genlin tian qianli Ma Jianfeng Ma Bamboo and Rattan Science and Technology Laboratory International Center for Bamboo and RattanBeijing100102China Key Laboratory of Wood Science and Technology of State Forestry and Grassland Administration Research Institute of Wood IndustryChinese Academy of ForestryBeijing100091China Carl Zeiss(Shanghai)Co. Ltd.Shanghai200131China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai201204China

In recent years,bamboo has been widely used in a broad range of applications,a thorough understanding of the structural characteristics of bamboo nodes is essential for better processing and manufacturing of biomimetic *** study investigated the complex anatomical structure for the nodes of two bamboo species,Indocalamus latifolius(Keng)McClure and Shibataea chinensis Nakai,using a high-resolution X-ray microtomography(μCT).The results show that the vascular bundle system in the nodal region of *** and *** is a net-like structure composed of horizontal and axial vascular ***,the fiber sheath surrounding metaxylem vessels tended to be shorter in the tangential *** structure of bamboo nodes facilitates the tangential and axial transport of moisture and *** anatomical structure of *** and *** nodes has obvious differences,especially in the arrangement of vascular *** bundle frequency was significantly higher in *** nodes than in *** *** findings indicate thatμCT is a nondestructive three-dimensional imaging method that can used to examine the anatomical structure of bamboo nodes.

关键词： Anatomical structure bamboo nodes I.latifolius S.chinensis X-ray microtomography(μCT)

S/Se-embedded acenaphthylene-imide-containing polycyclic heteroaromatic hydrocarbon

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Chinese Chemical Letters 2022年第1期33卷 271-275页

作者： Zhichao Wang qianli Ma Xuan Huang tian Zhang Jiawei Shao Xinglin Zhang Qian Shen Xiaochen Wang Jinjun Shao Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM) Nanjing Tech University(NanjingTech)Nanjing 211800China Department of Chemistry National University of SingaporeSingapore 117543Singapore School of Materials Science&Engineering Shaanxi Normal UniversityXi'an 710119China

Acenapththylene-imide(An I),similar to naphthalene diimide(NDI),is an outstanding building block for organic functional materials and has gained a lot of research ***,Sulphur and Selenium-embedded AnI-containing polycyclic aromatic hydrocarbon molecules,AnI-SQ and AnI-SeQ,with[1,2,5]thiadiazolo[3,4-g]quinoxaline(SQ)and[1,2,5]selenadiazolo[3,4-g]quinoxaline(Se Q)are designed and synthesized with low-lying LUMO energy *** absorption and emission of AnI-SQ and An I-Se Q displayed a bathochromic shift upon protonation of the C=N ***,theoretical calculation indicates remarkable rigid planar backbones for both An I-SQ and An I-Se *** self-assembly with polymeric Pluronic?F-127,corresponding hydrophilic nanoparticles(NPs)were prepared with low *** AnI-SQ NPs could be applied for in vitro two-photon fluorescence imaging.

关键词： Acenaphthylene-imide Polycyclic aromatic hydrocarbons Protonation Selenium Condensation

Surgical Therapeutic Strategy for Non-small Cell Lung Cancer with Mediastinal Lymph Node Metastasis (N2)

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中国肺癌杂志 2010年第4期13卷 342-348页

作者： qianli MA Deruo LIU Yongqing GUO Bin SHI Zhiyi SONG Yanchu tian Department of Thoracic Surgeryj China-Japan Friendship Hospital~ Beijing 100029 China

Background and objective Approximately 30% of patients who are diagnosed with non-small cell lung cancer (NSCLC) are classified as N2 on the basis of metastasis to the mediastinal lymph nodes. The effectiveness of surgery for these patients remains controversial. Although surgeries in recent years are proved to be effective to some extent,yet due to many reasons,5-year survival rate after surgery varies greatly from patient to patient. Thus it is necessary to select patients who have a high probability of being be cured through an operation,who are suitable to receive surgery and the best surgical methods so as to figure out the conditions under which surgical treatment can be chosen and the factors that may influence prognosis. Methods 165 out of 173 patients with N2 NSCLC were treated with surgery in our department from January 1999 to May 2003,among whom 130 were male,43 female and the sex ratio was 3:1,average age 53,ranging from 29 to 79. The database covers the patients’ complete medical history including the information of their age,sex,location and size of tumor,date of operation,surgical methods,histologic diagnosis,clinical stage,post-operative TNM stage,neoadjuvant treatment and chemoradiotherapy. The methods of clinical stage verification include chest X-ray,chest CT,PET,mediastinoscopy,bronchoscope (+?),brain CT or MRI,abdominal B ultrasound (or CT),and bone ECT. The pathological classification was based on the international standard for lung cancer (UICC 1997). Survival time was analyzed from the operation date to May 2008 with the aid of SPSS (Statistical Package for the Social Sciences) program. Kaplan-Meier survival analysis,Log-rank test and Cox multiplicity were adopted respectively to obtain patients’ survival curve,survival rate and the impact possible factors may have on their survival rate. Results The median survival time was 22 months,with 3-year survival rate reaching 28.1% and 5-year survival rate reaching 19.0%. Age,sex,different histolog

关键词：肺癌癌细胞 NSCLC 治疗

Novel mutation c.1210-3C>G in cis with a poly-T tract of 5T affects CFTR mRNA splicing in a Chinese patient with cystic fibrosis

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Frontiers of Medicine 2022年第1期16卷 150-155页

作者： Xinyue Zhao Keqiang Liu Wenshuai Xu Meng Xiao qianli Zhang Jiaxing Song Keqi Chen Yaping Liu Xinlun tian Kai-Feng Xu Xue Zhang McKusick-Zhang Center for Genetic Medicine State Key Laboratory of Medical Molecular BiologyInstitute of Basic Medical SciencesChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100005China Department of Pulmonary and Critical Care Medicine Peking Union Medical College HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100730China

Cystic fibrosis(CF)is a rare autosomal recessive disease with only one pathogenic gene cystic fibrosis transmembrane conductance regulator(CFTR).To identify the potential pathogenic mutations in a Chinese patient with CF,we conducted Sanger sequencing on the genomic DNA of the patient and his parents and detected all 27 coding exons of CFTR and their flanking intronic *** patient is a compound heterozygote of c.2909G>A,***970Asp in exon 18 and c.1210-3C>G in cis with a poly-T of 5T(T5)sequence,3 bp upstream in intron *** splicing effect of c.1210-3C>G was verified via minigene assay in vitro,indicating that wild-type plasmid containing c.1210-3C together with T7 sequence produced a normal transcript and partial exon 10-skipping-transcript,whereas mutant plasmid containing c.1210-3G in cis with T5 sequence caused almost all mRNA to skip exon ***,c.1210-3C>G,the newly identified pathogenic mutation in our patient,in combination with T5 sequence in cis,affects the CFTR gene splicing and produces nearly no normal transcript in ***,this patient carries a ***970Asp mutation,thus confirming the high-frequency of this mutation in Chinese patients with CF.

关键词： cystic fibrosis CFTR splicing mutation minigene

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新疆和田台阵PSD与PDF分析

地球物理学报 2019年第7期62卷 2591-2606页

作者：杨千里郝春月田鑫中国地震局地球物理研究所

和田台阵是我国第一个自主建成并运行至今的小孔径台阵,承担着监测印巴地区核试验以及我国西部地震活动的重要使命.台阵波形数据中充斥着背景噪声,直接影响着数据质量.为了评估台阵噪声水平,本文利用Welch平均周期法对9个子台记录的数... 详细信息

和田台阵是我国第一个自主建成并运行至今的小孔径台阵,承担着监测印巴地区核试验以及我国西部地震活动的重要使命.台阵波形数据中充斥着背景噪声,直接影响着数据质量.为了评估台阵噪声水平,本文利用Welch平均周期法对9个子台记录的数十万条噪声样本进行功率谱估计,对出现的谱异常进行了总结归纳,通过绘制概率密度函数图以及单频曲线来研究背景噪声变化范围和规律,最后针对台阵降噪提出了建设性意见.研究结果表明,中心台长周期噪声功率谱密度随季节变化显著,具有周期性;受温度和气压影响,水平分量长周期噪声变化幅度较大,局部频段超出新高噪声模型,建议改善仪器安装条件,或者利用数学方法进行校正.所有子台短周期噪声变化规律与长周期相反,受到采石场影响,谱密度曲线在4~8Hz之间出现形态规则的高频尖刺,A1、B3、B4子台最为明显,可以通过窄带滤波或者聚束予以压制.本文取得的研究成果为台阵运维提供重要依据,除此之外,总结出的不同地震频谱特征也为地震解释工作提供重要参考.

关键词：和田台阵功率谱密度背景噪声概率密度函数

石墨烯-水凝胶改性Ti/TNTs-Sb-SnO_2电极的电催化性能研究

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化工新型材料 2019年第3期47卷 94-98,103页

作者：田蕾张钱丽魏杰苏州科技大学化学生物与材料工程学院苏州215009

在钛板上电沉积TiO_2纳米管,并通过层层组装方式制备了Ti/TNTs-Sb-SnO_2-rGO电极。用扫描电镜(SEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)以及电化学等方法对电极形貌、微观结构和性能进行了表征。实验结果表明,该电极具有高的析氧电... 详细信息

在钛板上电沉积TiO_2纳米管,并通过层层组装方式制备了Ti/TNTs-Sb-SnO_2-rGO电极。用扫描电镜(SEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)以及电化学等方法对电极形貌、微观结构和性能进行了表征。实验结果表明,该电极具有高的析氧电位(2.1V)和良好的导电性能。在亚甲基蓝(MB)模拟染料废水的电氧化降解实验中,该电极能够有效去除有机污染物,降解1h,去除率为97%,降解过程符合一级动力学方程,反应速率常数为0.057min-1,降解机理为间接电化学氧化过程。电极的实验室加速寿命为9h,折合工业寿命为1.6a,表明该电极具有较长的使用寿命。

关键词：电催化氧化 TiO2纳米管石墨烯亚甲基蓝

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高铁隧道衬砌拱顶空洞对列车荷载响应研究

地下空间与工程学报 2016年第S2期12卷 669-677页

作者：田甜李泰灃黎国清张千里中国铁道科学研究院北京100081 中国铁道科学研究院基础设施检测研究所北京100081 中国铁道科学研究院铁道建筑研究所北京100081

以某高速铁路某一隧道存在拱顶空洞为工程背景,基于高速列车振动荷载实测数据和列车振动理论,利用ABAQUS有限元软件,建立隧道衬砌拱顶不含空洞与含有不同深度空洞的隧道结构有限元模型,施加相应的约束及边界条件,对隧道结构在列车振动... 详细信息

以某高速铁路某一隧道存在拱顶空洞为工程背景,基于高速列车振动荷载实测数据和列车振动理论,利用ABAQUS有限元软件,建立隧道衬砌拱顶不含空洞与含有不同深度空洞的隧道结构有限元模型,施加相应的约束及边界条件,对隧道结构在列车振动荷载作用下的动力响应行为进行数值仿真分析。研究结果表明,随空洞深度的增加,拱顶含空洞的衬砌结构将会使原有衬砌受力状态发生改变,空洞深度越大,围岩塑性区改变越明显,衬砌整体受力越不利;不含空洞的隧道衬砌关键点与轨道距离越近振动响应越明显,拱顶响应最弱;衬砌拱顶空洞深度对列车振动响应明显,随深度的加大,其响应越剧烈,使衬砌围岩塑性区发生进一步扩展并最终影响到隧道结构的整体稳定性,对列车运营安全造成威胁。研究结果对于进一步探索含缺陷隧道衬砌结构的劣化动力学行为奠定了基础。

关键词：高铁隧道拱顶空洞振动荷载动力响应有限元分析