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Fractional nonlinear energy sinks

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Applied Mathematics and Mechanics(English Edition) 2023年第5期44卷 711-726页

作者： Shengtao ZHANG jiaxi zhou Hu DING Kai WANG Daolin XU College of Mechanical and Vehicle Engineering Hunan UniversityChangsha 410082China Shanghai Institute of Applied Mathematics and Mechanics Shanghai Key Laboratory of Mechanics in Energy EngineeringSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200072China

The cubic or third-power(TP)nonlinear energy sink(NES)has been proven to be an effective method for vibration suppression,owing to the occurrence of targeted energy transfer(TET).However,TET is unable to be triggered by the low initial energy input,and thus the TP NES would get failed under low-amplitude *** resolve this issue,a new type of NES with fractional nonlinearity,e.g.,one-third-power(OTP)nonlinearity,is *** dynamic behaviors of a linear oscillator(LO)with an OTP NES are investigated numerically,and then both the TET feature and the vibration attenuation performance are ***,an analogy circuit is established,and the circuit simulations are carried out to verify the design concept of the OTP *** is found that the threshold for TET of the OTP NES is two orders of magnitude smaller than that of the TP *** parametric analysis shows that a heavier mass or a lower stiffness coefficient of the NES is beneficial to the occurrence of TET in the OTP NES ***,significant energy transfer is usually accompanied with efficient energy ***,the OTP NES can realize TET under low initial input energy,which should be a promising approach for micro-vibration suppression.

关键词： fractional nonlinearity nonlinear energy sink(NES) targeted energy transfer(TET) micro-vibration control

A Paleozoic mercury mineralisation event in South China:In situ U-Pb dating and chemical compositions of calcite from the Jianyan Hg deposit

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Science China Earth Sciences 2023年第8期66卷 1877-1891页

作者： Kai LUO jiaxi zhou Alexandre CUGERONE Meifu zhou Yuexing FENG Zhongguo JIN Jianxin ZHAO Key Laboratory of Critical Minerals Metallogeny in Universities of Yunnan Province School of Earth SciencesYunnan UniversityKunming 650500China School of Earth and Environmental Sciences The University of QueenslandBrisbane QLD 4072Australia State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China Department of Earth Sciences University of GenevaGeneva 1205Switzerland Southern Marine Science and Engineering Guangdong Laboratory Zhuhai 519000China Non-Ferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou Guiyang 550005China

The ages of hydrothermal Hg deposits are difficult to constrain because of the lack of suitable minerals for *** South China low-temperature metallogenic domain hosts numerous Hg deposits,including the Jianyan Hg deposit that is composed mainly of cinnabar and *** are two stages of calcite in the deposit:syn-ore calcite(Cal-Ⅰ)and post-ore/barren calcite(Cal-Ⅱ).Cal-Ⅰis mainly euhedral-subhedral and fine-grained,has homogeneous grey luminescence,and is associated with ***-anhedral Cal-Ⅱcrosscuts Cal-Ⅰand is relatively *** syn-ore Cal-Ⅰhas high U contents(0.1–1.3 ppm)and U/Pb ratios(up to 4.2),and is thus suitable for U-Pb *** a laser ablation-inductively coupled plasma-mass spectrometer equipped with ion counters,we obtained a U-Pb age of 426.3±5.7 Ma(MSWD=1.5)for *** age is interpreted to represent the timing of Hg mineralisation at Jianyan and is similar to ages of 440–400 Ma reported for many carbonate-hosted Pb-Zn and Ba-F deposits in South *** on the present results in combination with existing geochemical and geochronological data,we infer that these deposits belong to a Paleozoic Hg-Pb-Zn-Ba-F mineralisation system that was controlled by Caledonian tectonism.

关键词： In situ calcite U-Pb dating Paleozoic Hg mineralisation Caledonian tectonism Jianyan Hg deposit South China

A brief review of metamaterials for opening low-frequency band gaps

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Applied Mathematics and Mechanics(English Edition) 2022年第7期43卷 1125-1144页

作者： Kai WANG jiaxi zhou Dongguo TAN Zeyi LI Qida LIN Daolin XU College of Mechanical and Vehicle Engineering Hunan UniversityChangsha 410082China Research Institute of Hunan University in Chongqing Chongqing 401133China

Metamaterials are an emerging type of man-made material capable of obtaining some extraordinary properties that cannot be realized by naturally occurring *** to tremendous application foregrounds in wave manipulations,metamaterials have gained more and more ***,developing research interest of low-frequency vibration attenuation using metamaterials has emerged in the past *** better understand the fundamental principle of opening low-frequency(below 100 Hz)band gaps,a general view on the existing literature related to low-frequency band gaps is *** this review,some methods for fulfilling low-frequency band gaps are firstly categorized and detailed,and then several strategies for tuning the low-frequency band gaps are ***,the potential applications of this type of metamaterial are briefly *** review is expected to provide some inspirations for realizing and tuning the low-frequency band gaps by means of summarizing the related literature.

关键词： metamaterial low-frequency band gap vibration suppression

List-Serial Pipelined Hardware Architecture for SCL Decoding of Polar Codes

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China Communications 2023年第3期20卷 175-184页

作者： Zhongxiu Feng Cong Niu Zhengyu Zhang jiaxi zhou Daiming Qu Tao Jiang Research Center of 6G Mobile Communications School of Cyber Science and Engineeringand Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan 430074China Institute of Space Integrated Ground Network Hefei 230094China The 38th Research Institute of China Electronics Technology Group Corporation Hefei 230088China School of Electronics Information and Communications Huazhong University of Science and TechnologyWuhan 430074China

For polar codes,the performance of successive cancellation list(SCL)decoding is capable of approaching that of maximum likelihood ***,the existing hardware architectures for the SCL decoding suffer from high hardware complexity due to calculating L decoding paths simultaneously,which are unfriendly to the devices with limited logical resources,such as field programmable gate arrays(FPGAs).In this paper,we propose a list-serial pipelined hardware architecture with low complexity for the SCL decoding,where the serial calculation and the pipelined operation are elegantly combined to strike a balance between the complexity and the ***,we employ only one successive cancellation(SC)decoder core without L×L crossbars,and reduce the number of inputs of the metric sorter from 2L to L+***,the FPGA implementations show that the hardware resource consumption is significantly reduced with negligible decoding performance loss.

关键词： successive cancellation list decoding po-lar codes hardware implementation pipelined archi-tecture

The Origin of the Black Shale Series and Bentonites from the Wufeng Formation in the Southwestern Upper Yangtze:Implications for the Convergence of the Yangtze and Cathaysia Blocks in the Late Ordovician

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Acta Geologica Sinica(English Edition) 2022年第6期96卷 1897-1916页

作者： MIAO Yu zhou Ye zhou jiaxi TIAN Yufeng WU Liang LI Shizhong ZHANG Yaotang WANG Wanneng Kunming General Survey of Natural Resources Center China Geological SurveyKunming 650093China Faculty of Land and Resources Engineering Kunming University of Science and TechnologyKunming 650111China School of Earth Sciences Yunnan UniversityKunming 650504China

Early Paleozoic black organic sediments and bentonites occur widely in the craton basin within the Yangtze block and are generally believed to be genetically related to a specific tectonic setting on the cratonic ***,the intimate relationship between their origins and the dynamic mechanisms are unclear,as exemplified by the genesis of the black shale series and bentonites from the Wufeng Formation during the Ordovician–Silurian transition(OST).In order to reveal the relationship between the Wufeng Formation and the convergence of the Yangtze and Cathaysia blocks(i.e.,the intracontinental Kwangsian Orogeny),two stratigraphic sections respectively in Zhaotong area(Northeast Yunnan)and Puyi area(Northwestern Guizhou)that were located in the semi-restricted inner Yangtze Sea during the OST were systematically studied,on the basis of whole-rock geochemical composition,pyriteδ^(34)S(δ^(34)Spy),total organic carbon(TOC),stable Sr isotope,pyrite framboid size distribution and zircon U-Pb age,trace *** evidence shows that the paleo-oceanic environment changed significantly at the turn of the early–late Katian and formed the black shale series in the Wufeng *** acritarch assemblages were formed in the transition process of the Upper Yangtze Basin from passive continental margin basin to foreland basin during this *** on previous research on the genetic relationship between black shale series and plate tectonic movement,a basin-mountain evolution model suitable for South China in the Late Ordovician is *** two bentonites in the Wufeng Formation with U-Pb ages of 445.5±0.8 Ma and 441.9±2.4 Ma primarily originated from the intermediate–acid volcanic eruption during the collision and convergence between the Yangtze and Cathaysia blocks in the Late Ordovician,the provenance region probably being located in the Jiangnan orogenic ***,we believe that the appearance of the black shale series and bentonite in the Wufeng Forma

关键词： black shale series paleo-oceanic environment bentonites basin-mountain evolution Early Paleozoic Kwangsian Orogeny

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云南省锗矿资源成矿规律概要

地球学报 2024年第4期45卷 481-492页

作者：薛戈王小虎刀艳周家喜邢程肖高强苏肖宇曹晓民董涛李蓉罗建宏云南省地质调查局云南昆明650051 自然资源部三江成矿作用及资源勘查利用重点实验室云南昆明650051 昆明理工大学国土资源工程学院云南昆明650093 云南省三江成矿作用及资源勘查利用重点实验室云南昆明650051 云南大学地球科学学院云南省高校关键矿产成矿学重点实验室云南昆明650500

锗(Ge)矿是我国的战略矿种,也是云南省优势矿产。云南已探明Ge资源储量大,开发利用程度高,找矿空间大,主要包括煤层型和碳酸盐岩容矿型两类矿床。其中,煤层型锗矿床主要分布在滇西腾冲、芒市、沧源、临沧、澜沧等地,形成时代相对集中,... 详细信息

锗(Ge)矿是我国的战略矿种,也是云南省优势矿产。云南已探明Ge资源储量大,开发利用程度高,找矿空间大,主要包括煤层型和碳酸盐岩容矿型两类矿床。其中,煤层型锗矿床主要分布在滇西腾冲、芒市、沧源、临沧、澜沧等地,形成时代相对集中,为新近纪;碳酸盐岩容矿型锗矿床主要分布在滇东北东川、会泽、彝良、鲁甸等地,与铅锌矿床同体共生,形成时代普遍认为是三叠纪。本文全面梳理这两类矿床的成矿地质条件和资源空间分布特征,总结了其成矿规律;综合圈定出找矿预测区共23处。由此提出,当前应加强现有Ge矿床深部和外围地区接替资源找探矿及综合回收利用研究,及时对找矿预测区和有利远景区进行找矿勘查与靶区优选工作,尽快实现老区资源增储和新区找矿突破,为打造世界级Ge资源产业基地和国家Ge矿资源战略储备需求提供资源和技术保障。

关键词：锗矿矿床类型成矿规律云南省

新型冠状病毒奥密克戎感染下血小板转录组与蛋白质组的对比分析

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生物技术进展 2024年第4期14卷 649-656页

作者：马叶子夏美娟刘翠翠王洪涛周家喜中国医学科学院血液病医院(中国医学科学院血液学研究所)北京协和医学院血液与健康全国重点实验室国家血液系统疾病临床医学研究中心细胞生态海河实验室天津300020 天津医学健康研究院天津301600

血小板是维持机体稳态和应对疾病感染等的关键血液成分,其无核特征以及转录本和蛋白质来源的多样性导致血小板的转录组和蛋白组相关性普遍偏低。前期研究已解析了血小板蛋白质组在新型冠状病毒(severe acute respiratory syndrome coron... 详细信息

血小板是维持机体稳态和应对疾病感染等的关键血液成分,其无核特征以及转录本和蛋白质来源的多样性导致血小板的转录组和蛋白组相关性普遍偏低。前期研究已解析了血小板蛋白质组在新型冠状病毒(severe acute respiratory syndrome coronavirus 2,SARS-CoV2)奥密克戎感染不同阶段的动态表达模式,但对其具体来源未作深入分析。为了解血小板对奥密克戎感染的应答机制,对血小板蛋白组与转录本进行了对比分析,以探究不同蛋白分子的来源。结果发现,血小板转录组变化相较于蛋白组更为剧烈,且二者的变化存在差异。感染后血小板转录组与蛋白组共同上调的基因/蛋白主要富集了固有免疫、抗病毒免疫反应等特征,提示相关蛋白可能来自血小板内RNA翻译。血小板蛋白组单独上调的蛋白特征包括急性炎症反应、吞噬识别作用等,提示该部分蛋白可能由血浆直接摄入或与其他细胞互作所得。此外,血小板转录组也单独上调RNA代谢过程、RNA剪接的调控等相关基因。研究结果为探究奥密克戎感染条件下血小板RNA和蛋白质的来源多样性提供了重要的数据支撑。

关键词：奥密克戎血小板转录组蛋白组

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Geology and C-O isotope geochemistry of carbonate-hosted Pb-Zn deposits, NW Guizhou Province, SW China

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Chinese Journal Of Geochemistry 2013年第1期32卷 7-18页

作者： DOU Song zhou jiaxi Yunnan Nonferrous Metals Geological Bureau School of Geoscience and Info-Physics Central South University State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences

The Pb-Zn metallogenic district in NW Guizhou Province is an important part of the Yun-nan-Sichuan-Guizhou Pb-Zn metallogenic province, and also is one of the most important Pb-Zn producers in China. The hosting rocks of the Pb-Zn deposits are Devonian to Permian carbonate rocks, and the basement rocks are meta-sedimentary and igneous rocks of the Proterozoic Kunyang and Huili groups. The ore minerals are composed of sphalerite, galena and pyrite, and the gangue minerals are include calcite and dolomite. Geology and C-O isotope of these deposits were studied in this paper. The results show that δ13C and δ18O values of hydrothermal calcite, altered wall rocks-dolostone, sedimentary calcite and hosting carbonate rocks range from -5.3‰ to -0.6 ‰ (mean -3.4‰) and +11.3‰ to +20.9 ‰ (mean +17.2‰), -3.0‰ to +0.9 ‰ (mean -1.3‰) and +17.0‰ to +20.8‰ (mean +19.7‰), +0.6‰ to +2.5 ‰ (mean +1.4‰) and +23.4‰ to +26.5 ‰ (mean +24.6‰), and -1.8‰ to +3.9‰ (mean +0.7‰) and +21.0‰ to +26.8‰ (mean +22.9‰), respectively, implying that CO2 in the ore-forming fluids was mainly a result of dissolution of Devonian and Carboniferous carbonate rocks. However, it is difficult to evaluate the contribution of sediment de-hydroxylation. Based on the integrated analysis of geology, C and O isotopes, it is believed that the ore-forming fluids of these carbonate-hosted Pb-Zn deposits in this area were derived from multiple sources, including hosting carbonate rocks, Devonian to Permian sedimentary rocks and basement rocks (the Kun-yang and Huili groups). Therefore, the fluids mixing is the main precipitation mechanism of the Pb-Zn deposit in this province.

关键词：铅锌矿床碳酸盐岩碳氧同位素综合地质中国西南同位素地球化学贵州省托管

花岗岩Sn-W-Nb-Ta-Rb-Cs-Li成矿作用的研究方法——以滇西南大同山稀土矿区土壤化探异常查证为例

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矿产勘查 2024年第7期15卷 1204-1214页

作者：顾光明李杭严城民周家喜马重辉罗伟周坤高爱奎雷星云南省核工业地质调查院云南昆明650106 云南省地矿局区域地质矿产调查大队云南玉溪653100 云南大学资源环境与地球科学学院云南昆明650500

滇西南大同山稀土矿区位于临沧花岗岩中南段,基岩主要为三叠纪黑云母二长花岗岩,属“S”型花岗岩,形成于同碰撞环境。临沧花岗岩分布区为Sn、W、Bi、B、Li、Rb、Cs、Pb、As、Sb高丰度区,在矿区内La-Y-Nb组合异常,但未进行检查。在矿区1... 详细信息

滇西南大同山稀土矿区位于临沧花岗岩中南段,基岩主要为三叠纪黑云母二长花岗岩,属“S”型花岗岩,形成于同碰撞环境。临沧花岗岩分布区为Sn、W、Bi、B、Li、Rb、Cs、Pb、As、Sb高丰度区,在矿区内La-Y-Nb组合异常,但未进行检查。在矿区1∶50 000土壤地球化学调查中,圈定了16个综合异常。异常查证中,在13个综合异常区的半风化—微风化花岗岩中共采集19件化学分析样,分析了与综合异常相关的7种元素(Sn、W、Nb、Ta、Rb、Cs、Li)。本研究中总结了4种方法:(1)经岩石类型分析数值比较,除中粗粒黑云母二长花岗岩(ηγ^(c)T)与Cs_(2)O矿化有较密切关系外,其他岩石类型与矿化无明显关系;(2)通过样品分析数值比较,将样品划分为矿化元素、矿化程度不同的4种类型;(3)通过矿化系数分析,矿区可能存在Sn-W矿化、Rb-Cs矿化;(4)通过成矿系数分析,矿种的平均成矿系数由大至小为Rb_(2)O(0.6929)→Nb_(2)O_(5)(0.1445)→Cs_(2)O(0.0626)→Ta_(2)O_(5)(0.0378)→WO_(3 )(0.0195)→Sn(0.0101)→Li_(2)O(0.0098)。这4种研究方法对研究临沧花岗岩的成矿作用、进行成矿预测有较为重要的指导作用。在地质背景相似的地区寻找相似矿种,也可借鉴本文提出的研究方法。

关键词：花岗岩 Sn-W-Nb-Ta-Rb-Cs-Li 分析数值比较矿化系数分析成矿系数分析大同山稀土矿床

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