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Prototype of readout electronics for the LHAASO KM2A electromagnetic particle detectors

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chinese Physics c 2016年第7期40卷 105-110页

作者：刘湘常劲帆王铮樊磊 State Key Laboratory of Particle detection and Electronics Chinese Academy of SciencesBeijing 100049China Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China University of chinese Academy of Sciences Beijing 100049 China

The KM2A （one kilometer square extensive air shower array） is the largest detector array in the LHAASO （Large High Altitude Air Shower Observatory） project. The KM2A consists of 5242 Eds （Electromagnetic particle detectors） and 1221 Mds （Muon detectors）. The Eds are distributed and exposed in the wild. Two channels, anode and dynode, are employed for the PMT （photomultiplier tube） signal readout. The readout electronics designed in this paper aims at accurate charge and arrival time measurement of the PMT signals, which cover a large amplitude range from 20 P.E. （photoelectrons） to 2x105 P.E. By using a ＂trigger-less＂ architecture, we digitize signals close to the PMTs. All digitized data is transmitted to dAQ （data Acquisition） via a simplified White Rabbit protocol. compared with traditional high energy experiments, high precision of time measurement over such a large area and suppression of temperature effects in the wild become the key techniques. Experiments show that the design has fulfilled the requirements in this project.

关键词： LHAASO Ed readout electronics White Rabbit

Snapshot imaging of ultrashort electron bunches

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Light(Science & Applications) 2024年第7期13卷 1226-1228页

作者： Andreas döpp Ludwig-Maximilian-Universität München Am Coulombwall 185748GarchingGermany Max Planck Institut für Quantenoptik Hans-Kopfermann-Strasse 1Garching85748Germany

New measurements combine spatial and temporal information from optical transition radiation to estimate the three-dimensional structure of electron bunches from a laser wakefield accelerator.

关键词： ultrashort Snapshot electron

水痘-带状疱疹病毒编码circRNA的鉴定与表征

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中国疼痛医学杂志 2024年第8期30卷 561-562页

作者：杨少敏(译) 肖礼祖(校) cao d Jaijyan dK 深圳大学医学部生物医学工程学院医学超声关键技术国家地方联合工程实验室广东省生物医学信息检测与超声成像重点实验室深圳大学第六附属医院(南山医院)疼痛医学重点实验室不详

在真核生物中,环状RNA(circular RNA,circRNA)是一种重要的转录本。该研究证明了水痘-带状疱疹病毒(varicella-zoster virus,VZV)感染过程中可产生病毒来源的circRNA。该研究通过联合二代与三代深度circRNA测序,绘制了高分辨率的细胞和... 详细信息

在真核生物中,环状RNA(circular RNA,circRNA)是一种重要的转录本。该研究证明了水痘-带状疱疹病毒(varicella-zoster virus,VZV)感染过程中可产生病毒来源的circRNA。该研究通过联合二代与三代深度circRNA测序,绘制了高分辨率的细胞和病毒circRNA图谱。接着,在VZV感染的细胞以及带状疱疹病人组织样品中,通过多种实验技术手段进一步验证VZV感染可产生大量病毒circRNA。此外,该研究发现了许多与VZV潜伏相关转录本同源的circRNA(circVLTSlytic)。为了分析这些circVLTSlytic的生物学功能,利用细菌人工染色体系统在基因组dNA水平,对circVLT进行突变。结果发现,circVLT是VZV复制的非必需分子,但circVLTsSlytic外显子5下游的突变可导致VZV对阿昔洛韦敏感性增加。该研究首次证明了VZV感染可产生具有生物学功能的病毒来源circRNA,这为带状疱疹的防治提供了新的思路。

关键词：病毒来源带状疱疹病细菌人工染色体阿昔洛韦感染过程 zoster VZV 转录本

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爱吃鱼的“老饕”——红胸秋沙鸭

小学生时代 2024年第5期 F0003-F0003页

作者：富春一凡(图) 东方ic(图) 东方ic

上个月,一伙爱吃鱼的“老饕(tao)”离开了钱塘江,呼啦啦扑闪着翅膀,飞去北方寻找美食。“老饕”爱鱼如痴,几乎整天都在水上游弋,它们时常将头钻入水中,探视水中猎物。要是发现了目标,它们先往上一跃,借着势头再翻身潜入水中,电光火石间... 详细信息

上个月,一伙爱吃鱼的“老饕(tao)”离开了钱塘江,呼啦啦扑闪着翅膀,飞去北方寻找美食。“老饕”爱鱼如痴,几乎整天都在水上游弋,它们时常将头钻入水中,探视水中猎物。要是发现了目标,它们先往上一跃,借着势头再翻身潜入水中,电光火石间就用专用利器一细长而带钩的嘴将鱼擒获,钱塘江里鲜美的野生鲢鱼、鲻(zi)鱼、鲈鱼等都是它们的美食。

关键词：老饕钱塘江美食电光火石

江南造山带东段地区三堡铅锌矿床花岗闪长斑岩的形成年代、地球化学特征及成矿指示

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大地构造与成矿学 2024年第4期48卷 879-898页

作者：侯舒雅张达玉张飞雷行行胡梦祥翁望飞 Noel c White 合肥工业大学资源与环境工程学院安徽合肥230009 安徽省地质矿产勘查局332地质队安徽黄山245000

三堡铅锌矿床位于江南古陆北部,其成矿作用与花岗闪长斑岩密切相关。本文在地质特征和岩相学认识基础上,对与三堡铅锌矿床相关的花岗闪长斑岩开展了锆石LA-icP-MS U-Pb同位素年代学、全岩地球化学和Sr-Nd同位素分析。结果显示,三堡花岗... 详细信息

三堡铅锌矿床位于江南古陆北部,其成矿作用与花岗闪长斑岩密切相关。本文在地质特征和岩相学认识基础上,对与三堡铅锌矿床相关的花岗闪长斑岩开展了锆石LA-icP-MS U-Pb同位素年代学、全岩地球化学和Sr-Nd同位素分析。结果显示,三堡花岗闪长斑岩锆石U-Pb年龄为154.8±1.8 Ma,为晚侏罗世。三堡花岗闪长斑岩SiO_(2)含量为63.75%~67.47%,Na_(2)O+K_(2)O为3.92%~7.34%,为高钾钙碱性、准铝质‒弱过铝质的I型花岗岩;且样品富集轻稀土元素(LREE/HREE=10.50~11.29)、显示弱负Eu异常(δEu=0.68~0.77),富集Rb、Th、U、K等大离子亲石元素,亏损P、Ti、Yb等高场强元素。花岗闪长斑岩(^(87)Sr/^(86)Sr)i值为0.71028~0.71320,ε_(Nd)(t)值在-6.57~-5.55之间。岩石地球化学特征显示,三堡花岗闪长斑岩熔体来自壳幔混合源区,上升过程中经历了显著的结晶分异作用。结合区域资料对比显示,三堡铅锌矿床为江南造山带东段地区燕山期早阶段(177~153 Ma)铜铅锌成矿作用的重要组成部分,该花岗闪长斑岩所呈现的中低结晶温度、较低分异程度、较高氧逸度与水含量是该区中酸性岩浆岩的成矿专属性指标。

关键词：花岗闪长斑岩成岩年代岩石成因成矿专属性江南造山带东段地区

discovery of new MAX-phase-like layered ternary carbide V_(8)P_(6)c:crystal structure,thermal expansion,and elastic properties

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Journal of Materials Science & Technology 2024年第7期174卷 55-62页

作者： H.X.chen L.Sheng Z.L.Zhang X.c.Wen d.L.Yang X.Y.Ye P.Q.dai School of Materials Science and Engineering Fujian University of TechnologyFuzhou 350118China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of ScienceBeijing 100049China Fujian Provincial Key Laboratory of Advanced Materials Processing and Application Fuzhou 350118China State Key Laboratory of Structural chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

due to the laminated structure,MAX phases and MAX-phase-like compounds possess outstanding dam-age tolerance capability with good thermal/electrical conductivity and other charming functional prop-erties,showing a bright future for structural-functional ***,a new MAX-phase-like ternary car-bide V_(8)P_(6)c with layered characteristics was *** to the alternate stacking of hexagonal-arranged M/A/X atom layers in MAX phases,V_(8)P_(6)c has a layered structure formed by a repeated stacking of the slabs consisting of V_(6)c-octahedrons and VP 6-distorted-octahedrons in three-atomic layers *** thermal expansion anisotropy was revealed,with the thermal expansion coefficients(TEcs)along a-axis,c-axis,and the average value,equal toα_(a)=8.55(5)μK^(−1),α_(c)=10.23(5)μK^(−1),andα_(L)=9.14(5)μK^(−1),*** dilation along the c-axis was mainly dominated by out-plane V-P bonds be-tween layered *** to the pressure-dependent lattice parameters,the polycrystalline bulk modulus(B_(0)=185(9)GPa)and high compressibility anisotropy factor(B_(a)/B_(c)=1.64)was ***-while,the second-order elastic constants were calculated,and the elastic moduli,E=303 GPa,B=198 GPa,G=122 GPa,andν=0.246,were *** the weak connection between layer slabs by out-plane V1-P bond was revealed by the bond stiffness model,with a bond stiffness close to the M-A bond in MAX ***,good damage tolerance capability was predicted according to Paugh’s ratio(G/B=0.616)and cauchy pressure(P_(a)=0 GPa,P_(c)=-7.5 GPa),even better than those of typical MAX *** discovery of V_(8)P_(6)c provides a new member of MAX-phase-like damage-tolerant ceramic with relatively low density,moderate thermal expansion,and anisotropic compressibility,and the unique lay-ered structure is inspiring for exploring new layered ternary ceramics.

关键词： New ternary carbide MAX phase Thermal expansion Elastic constants Anisotropy

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从欧盟到中国：捷克外交政策转变的原因

从欧盟到中国：捷克外交政策转变的原因

作者： cerna.Kristyna 浙江大学

学位级别：硕士

This thesis analyses the driving force behind the czech President Milos Zeman,and using a three-level analysis,puts it into comparison with relations between the czech Republic and china,and the EU and *** three-level analysis was implemented by Kenneth Waltz,a well-known American political *** book Man,the State and War analyzes the reasons behind *** thesis uses the three-level analysis to analyze the reasons for the czech Republic's change of foreign policy which brought about better relations with *** three levels are:the czech President Milos Zeman,the czech Republic as a country and the European Union with a stress on central and Eastern European *** the changes in the Government of the czech Republic in 2013,big steps have been taken towards a better relationship with china,as politicians lead by Zeman fought for the improvement of the mutual relationship and the restoration of the cooperation between the czech Republic and *** effort was rewarded with the first visit of a chinese President in the history of the czech Republic,and Pavel Nedved,the world-famous czech football player,became a face of the chinese football Super League next to david Beckham.

关键词： czech Republic china Milo? Zeman

The association of physical activity duration and intensity on emotional intelligence in 10-13 year-old children

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Sports Medicine and Health Science 2024年第4期6卷 331-337页

作者： Marie c.Gabour Tongjian You Richard Fleming Paul d.McNicholas Philimon N.Gona department of Health Sciences Regis College235 Wellesley StreetWestonMA02493USA department of Exercise and Health Sciences University of Massachusetts Boston100 Morrissey BlvdBostonMA02125USA department of Mathematics&Statistics McMaster UniversityHamiltonOntarioCanada L8S 4L8

Previous studies have shown that Physical Activity(PA)has a positive association with emotional health and intelligence in adolescents but none have focused on the relationship of PA duration and intensity on Emotional Intelligence(EI).The purpose of this study was to cross-sectionally assess the association of PA measures on overall EI and its domains in a cohort of 2029 adolescents aged 10-13 years of age in the National Longitudinal Survey for children and Youth(NLScY)from *** linear regression analysis of EI was adjusted for age,sex,annual household income,and health ***-way analysis of variance(ANOVA)was used to relate PA duration measured in minutes,frequency,and intensity categories with continuous GEI scores and also the corresponding scores for domains of *** mean GEI scores were(28.3±6.6)for 0-30 minute(min)PA duration,(30.0±6.5)for 30 tod(30.1±6.5)for≥121 *** was a statistically significant linear trend across PA duration categories,p?***-hoc pairwise comparison revealed that compared to the referent category(category)was statistically significantly lower GEI than each of the other two PA categories(30-59 min;and 60-120 min),both p-valuesd Health Organization(WHO)guidelines for duration and vigorous intensity were positively associated with the higher overall EI and its domains except for Stress Management.

关键词： Physical activity duration Intensity Emotional Intelligence Adolescents

Influence of variable viscosity and double diffusion on the convective stability of a nanofluid flow in an inclined porous channel

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Applied Mathematics and Mechanics(English Edition) 2024年第3期45卷 563-580页

作者： N.HUMNEKAR d.SRINIVASAcHARYA department of Mathematics National Institute of TechnologyWarangal 506004TelanganaIndia

The influence of variable viscosity and double diffusion on the convective stability of a nanofluid flow in an inclined porous channel is *** darcyBrinkman model is used to characterize the fluid flow dynamics in porous *** analytical solutions are obtained for the unidirectional and completely developed *** on a normal mode analysis,the generalized eigenvalue problem under a perturbed state is *** eigenvalue problem is then solved by the spectral ***,the critical Rayleigh number with the corresponding wavenumber is evaluated at the assigned values of the other flow-governing *** results show that increasing the darcy number,the Lewis number,the dufour parameter,or the Soret parameter increases the stability of the system,whereas increasing the inclination angle of the channel destabilizes the ***,the flow is the most unstable when the channel is vertically oriented.

关键词： nanofluid inclined channel variable viscosity linear stability double dif-fusion porous medium