检索结果-南通市图书馆

A Residual Frequency Offset Estimation Method Based on range Migration Fitting

在线全文

学校读者我要写书评

暂无评论

Journal of Beijing Institute of Technology 2024年第2期33卷 103-110页

作者： Liting Zhang Hao Huan ran tao Xiaogang Tang School of Information and Electronics Beijing Institute of Technology School of Aerospace Information Space Engineering University

Recently, researchers have proposed an emitter localization method based on passive synthetic aperture. However, the unknown residual frequency offset(RFO) between the transmitter and the receiver causes the received Doppler signal to shift, which affects the localization accuracy. To solve this issue, this paper proposes a RFO estimation method based on range migration fitting. Due to the high frequency modulation slope of the linear frequency modulation(LFM)-modulation radar signal, it is not affected by RFO in range compression. Therefore, the azimuth time can be estimated by fitting the peak value position of the pulse compression in range ***, the matched filters are designed under different RFOs. When the zero-Doppler time obtained by the matched filters is consistent with the estimated azimuth time, the given RFO is the real RFO between the transceivers. The simulation results show that the estimation error of azimuth distance does not exceed 20 m when the received signal duration is not less than 3 s, the pulse repetition frequency(PRF) of the transmitter radar signal is not less than 1 k Hz, the range detection is not larger than 1 000 km, and the signal noise ratio(SNR) is not less than –5 d B.

关键词： range migration fitting (RMF) passive localization residual frequency offset (RFO)

Application of interpolated double network model for carbon nanotube composites in electrothermal shape memory behaviors

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2024年第8期40卷 133-153页

作者： Ting Fu Zhao Yan Li Zhang ran tao Yiqi Mao Department of Engineering Mechanics College of Mechanical and Vehicle EngineeringHunan UniversityChangsha410082China State Key Laboratory of Explosion Science and Technology Institute of Advanced Structure TechnologyBeijing Institute of TechnologyBeijing100081China

Multi-wall carbon nanotube filled shape memory polymer composite(MWCNT/SMC)possessed enhanced modulus,strength,and electric conductivity,as well as excellent electrothermal shape memory properties,showing wide design scenarios and engineering application *** thermoelectrically triggered shape memory process contains complex multi-physical mechanisms,especially when coupled with finite deformation rooted on micro-mechanisms.A multi-physical finite deformation model is necessary to get a deep understanding on the coupled electro-thermomechanical properties of electrothermal shape memory composites(ESMCs),beneficial to its design and wide *** into consideration of micro-physical mechanisms of the MWCNTs interacting with double-chain networks,a finite deformation theoretical model is developed in this work based on two superimposed network chains of physically crosslinked network formed among MWCNTs and the chemically crosslinked *** intact crosslinked chemical network is considered featuring with entropic-hyperelastic properties,superimposed with a physically crosslinked network where percolation theory is based on electric conductivity and electric-heating *** model is calibrated by experiments and used for shape recoveries triggered by heating and electric *** captures the coupled electro-thermomechanical behavior of ESMCs and provides design guidelines for MWCNTs filled shape memory polymers.

关键词： Shape memory polymer composite Viscoplastic constitutive relations Electro-thermomechanics Double network model Multiple shape memory

METTL5 promotes cell proliferation,invasion,and migration by up-regulating Toll-like receptor 8 expression in colorectal cancer

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Oncology 2024年第5期16卷 2006-2017页

作者： Ling-Shang Kong ran tao Yi-Fan Li Wen-Bin Wang Xue Zhao Department of General Surgery The Second Affiliated Hospital of Anhui Medical UniversityHefei 230001Anhui ProvinceChina Department of Vascular Surgery The Second Affiliated Hospital of Anhui Medical UniversityHefei 230002Anhui ProvinceChina Department of General Surgery The First Affiliated Hospital of Anhui Medical UniversityHefei 230001Anhui ProvinceChina Anhui Public Health Clinical Center Hefei 230012Anhui ProvinceChina Department of Scientific Research Anhui Public Health Clinical CenterHefei 230012Anhui ProvinceChina Department of Scientific Research The First Affiliated Hospital of Anhui Medical UniversityHefei 230001Anhui ProvinceChina

BACKGROUND N6-methyladenosine(m6A)modification represents the predominant alteration found in eukaryotic messenger RNA and plays a crucial role in the progression of various ***,despite its significance,the comprehensive investigation of METTL5,a key m6A methyltransferase,in colorectal cancer(CRC)remains *** To investigate the role of METTL5 in *** We assessed METTL5 expression levels in clinical samples obtained from CRC patients as well as in CRC cell *** elucidate the downstream targets of METTL5,we performed RNA-sequencing analysis coupled with correlation analysis,leading us to identify Toll-like receptor 8(TLR8)as a potential downstream *** vitro functional assessments of METTL5 and TLR8 were conducted using CCK-8 assays,scratch assays,as well as assays measuring cell migration and *** Our findings reveal a pronounced upregulation of METTL5 expression in both CRC cells and tissues,which correlated significantly with an unfavorable *** vitro experiments unequivocally demonstrated the oncogenic role of METTL5,as evidenced by its promotion of CRC cell proliferation,invasion,and ***,we identified TLR8 as a downstream target of METTL5,and subsequent down-regulation of TLR8 led to a significant inhibition of CRC cell proliferation,invasion,and tumor *** The heightened expression of METTL5 in CRC is strongly associated with clinicopathological features and a poor prognosis,thereby underscoring its potential utility as a critical marker for facilitating early diagnosis and prognostication in CRC.

关键词： METTL5 Toll-like receptor 8 Colorectal cancer

Aerodynamic Super-Repellent Surfaces

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research 2024年第2期2023卷 115-122页

作者： Fanfei Yu Jinlong Yang ran tao Yao Tan Jinpei Wang Dehui Wang Longquan Chen Zuankai Wang Xu Deng Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054P.R.China Department of Mechanical Engineering City University of Hong KongKowloonHong Kong Special Administrative Region 999077P.R.China School of Physics.University of Electronic Science and Technology of China Chengdu 610054P.R.China Department of Mechanical Engineering Hong Kong Polytechnic UniversityKowloonHong Kong Special Administrative Region 999077P.R.China Shenzhen Institute for Advanced Study University of Electronic Science and Technology of ChinaShenzhen 518110P.R.China

Repelling liquid drops from engineering surfaces has attracted great attention in a variety of *** achieve efficient liquid shedding,delicate surface textures are often introduced to sustain air pockets at the liquid-solid ***,those surfaces are prone to suffer from mechanical failure,which may bring reliability issues and thus limits their ***,inspired by the aerodynamic Leidenfrost effect,we present that impacting drops are directionally repelled from smooth surfaces supplied with an exogenous air *** theoretical analysis reveals that the synchronized nonwetting and oblique bouncing behavior is attributed to the aerodynamic force arising from the air *** versatility and practicability of our approach allow for drop repellency without the aid of any surface wettability treatment and also avoid the consideration of mechanical stability issues,which thereby provides a promising candidate for the applications that necessitate liquid shedding,e.g.,resolve the problem of tiny raindrop adhesion on the automobile side window during driving.

关键词： thereby driving attributed

Effects of in-situZrB_2 nanoparticles and scandium on microstructure and mechanical property of 7N01 aluminum alloy

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第3期42卷 612-620,I0007页

作者： Xizhou Kai Yuhui Wang Ruikun Chen Yanjie Peng Anjun Shi ran tao Xiangfeng Liang Guirong Li Gang Chen Xiaojing Xu Yutao Zhao School of Material Science and Engineering Jiangsu UniversityZhenjiang212013China Institute for Advanced Manufacturing and Modern Equipment Technology Jiangsu UniversityZhenjiang212013China

In this study, the in-situ synthesized ZrB_(2) nanoparticles and rare earth Sc were introduced to enhance the strength and ductility of 7N01 aluminum alloy, via the generation of high-melting and uniform nanodispersoids. The microstructure and mechanical property evolution of the prepared composites and the interaction between ZrB_(2) and Sc were studied in detail. The microstructure investigation shows that the introduction of rare earth scandium(Sc) can promote the distribution of ZrB_(2) nanoparticles, by improving their wettability to the Al melt. Meanwhile, the addition of rare earth Sc also modifies the coarse Al Zn Mg Mn Fe precipitated phases, refines the matrix grains and generates high-melting Al_3(Sc,Zr)/Al_3Sc nanodispersoids. Tensile tests of the composites show that with the combinatorial introduction of ZrB_(2) and Sc, the strength and ductility of the composites are improved simultaneously compared with the corresponding 7N01 alloy, ZrB_(2) /7N01 composite and Sc/7N01 alloy. And the optimum contents of ZrB_(2) and Sc are 3 wt% and 0.2 wt% in this study. The yield strength, ultimate strength and elongation of(3 wt% ZrB_(2) +0.2 wt% Sc)/7N01 composite are 477 MPa, 506 MPa and 9.8%, increased about 18.1%, 12.2%and 38% compared to 7N01 alloy. Furthermore, the cooperation strengthening mechanisms of ZrB_(2) and Sc are also discussed.

关键词： 7N01 aluminum alloy In-situ ZrB_(2)nanoparticles Rare earth Sc Microstructure Mechanical property Mechanism

在线全文

学校读者我要写书评

暂无评论

《浙音释字琴谱》与明琴歌配词风气之发端

中国音乐学 2024年第3期 53-63页

作者：陶冉北京大学中文系

明代琴曲配词论争的发展脉络仍待详考,对此,《浙音释字琴谱》在配词风气发端方面的价值需要重估。该谱实为朱权五世孙拱椳和牛田龚氏廿二世孙效孔于正德朝编释,虽与当时重声轻文的浙派琴谱同源,却开逐声配词风气之先。该谱集为传世古近... 详细信息

明代琴曲配词论争的发展脉络仍待详考,对此,《浙音释字琴谱》在配词风气发端方面的价值需要重估。该谱实为朱权五世孙拱椳和牛田龚氏廿二世孙效孔于正德朝编释,虽与当时重声轻文的浙派琴谱同源,却开逐声配词风气之先。该谱集为传世古近琴曲敷演歌词,成为宁王传谱的承继者和浙派传谱的变体,更为万历后杨表正等人琴曲配词活动的分化演变奠定重要基础。

关键词：琴歌《浙音释字琴谱》配词存文之争

在线全文

学校读者我要写书评

暂无评论

气候风险会加剧企业避税吗

财经科学 2024年第1期 91-102页

作者：陶然西南财经大学会计学院

气候变化是当今全球面临的一大严峻问题。本文以2007—2021年我国A股上市公司为样本,实证研究了气候风险对企业避税行为的影响。研究发现,随着气候风险的增加,企业避税程度也会加深。该结论在经过一系列的内生性和稳健性测试后仍然成立... 详细信息

气候变化是当今全球面临的一大严峻问题。本文以2007—2021年我国A股上市公司为样本,实证研究了气候风险对企业避税行为的影响。研究发现,随着气候风险的增加,企业避税程度也会加深。该结论在经过一系列的内生性和稳健性测试后仍然成立。影响机制研究表明,气候风险主要是通过提高企业的经营风险和融资约束从而加剧企业进行避税的。异质性分析表明,对于重污染企业、非国有企业以及成本转嫁能力较低的企业中,气候风险与企业避税的正相关关系更为明显。

关键词：气候风险企业避税经营风险融资约束

在线全文

学校读者我要写书评

暂无评论

体育仲裁受理范围的争议问题与法律解释

上海体育大学学报 2024年第10期48卷 49-61页

作者：赵毅陶然苏州大学王健法学院江苏苏州215006

就新《体育法》第92条体育仲裁受理范围的规定,当前理论与实务界存在限缩解释论和扩张解释论的分歧,争议焦点即是否将体育商事合同纠纷和体育领域工作合同纠纷纳入体育仲裁受理范围。体育自治规范的专业性和技术性意味着体育法律关系的... 详细信息

就新《体育法》第92条体育仲裁受理范围的规定,当前理论与实务界存在限缩解释论和扩张解释论的分歧,争议焦点即是否将体育商事合同纠纷和体育领域工作合同纠纷纳入体育仲裁受理范围。体育自治规范的专业性和技术性意味着体育法律关系的纠纷解决需依赖专门的争端解决机制,这是解释体育仲裁受理范围的方法论基点。就国际体育仲裁法庭和体育发达国家的经验而言,体育仲裁受理范围包括体育商事合同纠纷,体育领域工作合同纠纷也未被明确排除出体育仲裁机构的管辖。从历史解释出发,体育仲裁受理范围的确定需要与国际经验接轨,保持开放空间。将体育商事合同纠纷和运动员工作合同纠纷纳入体育仲裁受理范围,内含于新《体育法》第92条的文义,有助于避免与新《体育法》第96条可能存在的体系冲突,符合新《体育法》及其“体育仲裁”章的立法目的。

关键词：体育仲裁受理范围体育法体育纠纷解决机制法律解释

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

职业足球俱乐部重整机制研究

体育与科学 2024年第3期45卷 27-35页

作者：陶然赵毅苏州大学王健法学院

我国职业足球俱乐部的运营模式、股权结构以及融资能力尚未充分实现市场化，因而其面临着盈利能力薄弱、股权高度集中、融资壁垒较高等多方面的挑战。这些问题的叠加导致许多职业足球俱乐部深陷债务危机之中。为摆脱这一困境，职业足球... 详细信息

我国职业足球俱乐部的运营模式、股权结构以及融资能力尚未充分实现市场化，因而其面临着盈利能力薄弱、股权高度集中、融资壁垒较高等多方面的挑战。这些问题的叠加导致许多职业足球俱乐部深陷债务危机之中。为摆脱这一困境，职业足球俱乐部急需重整机制的支持，以市场化的方式主动解决自身债务问题。职业足球俱乐部具备特殊的重整价值，包括人力资源价值、地方文化价值、球队品牌价值。职业足球俱乐部重整机制的构建应当注意限制“金元足球”运营模式，优化俱乐部股权结构及出资形式。中国足球协会可尝试建立行业内部的预重整程序。在特殊情形下，法院可对俱乐部及其母公司适用深石原则或实质合并规则。

关键词：职业足球俱乐部重整体育法