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Competition between fusion-evaporation and multifragmentation in central collisions in ^(58)Ni+^(48)Ca at 25A meV

Nuclear Science and Techniques 2013年第5期24卷 82-88页

作者： FRANCALANZA L ABBONDANNO U AmORINI F BARLINI S bini m BOUGAULT R BRUNO m CARDELLA G CASINI G AGOSTINO m D' De FILIPPO V De SANCTIS J GERACI E GIUSSANI A GRAmEGNA F GUIOT B KRAVCHUK V La GUIDARA E LANZALONE G Le NEINDRE N mAIOLINO C mARINI P mORELLI L OLmI A PAGANO A PAPA m PIANTELLI S PIRRONE S POLITI G POGGI G PORTO F RUSSOTTO P RIZZO F VANNINI G VANNUCCI L INFN Laboratori Nazionali del Sud-LNS Catania 95123Italy Dipartimento di Fisica Universitàdi Catania I-95129Italy INFN Sezione di Trieste Trieste I-34127Italy Dipartimento di Fisica Universitàdi FirenzeINFN Sezione di Firenze 1-50139Italy LPC Caen IN2P3-CNRS/ENSICAEN and UniversitéF-14050 Caen cedex 5-140France Dipartimento di Fisica Universitàdi Bologna and INFN Sezione di Bologna 4-50121Italy INFN Sezione di Catania I-95129 Italy INFN Sezione di Firenze I-50139 Italy Dipartimento di Fisica Universitàdi Milano and INFN Sezione di Milano1-20126Italy INFN Laboratori Nazionali di Legnaro 1-35020 Italy Centro Siciliano di Fisica Nucleare e Struttura della materia Catania 1-95129Italy UniversitàKore Enna 1-94100Italy

The experimental data concerning the58Ni+48Ca reaction at Elab(Ni)=25A meV,collected by using the CHImERA 4π device,have been analyzed in order to investigate the competition among different reaction mechanisms for central collisions in the Fermi energy domain.As a main criterion for centrality selection we have chosen the flow angle(flow) method,making an event-by-event analysis that considers the shape of events,as it is determined by the eigenvectors of the experimental kinetic-energy tensor.For the selected central events(flow >60°) some global variables,good to characterize the pattern of central collisions have been constructed.The main features of the reaction products were explored by using different constraints on some of the relevant observables,like mass and velocity distributions and their correlations.much emphasis was devoted,for central collisions,to the competition between fusion-evaporation processes with subsequent identification of a heavy residue and a possible multifragmentation mechanism of a well defined(if any) transient nuclear system.Dynamical evolution of the system and pre-equilibrium emission were taken into account by simulating the reactions in the framework of transport theories.Different approaches have been envisaged(dynamical stochastic BNV calculations + sequential SImON code,QmD,ComD,etc.).Preliminary comparison of the experimental data with BNV calculations shows reasonable agreement with the assumption of sequential multifragmentation emission in the mass region of ImFs close to the heavy residues.Possible deviations from sequential processes were found for those ImFs in the region of masses intermediate between the mass of heavy residues and the mass of light ImFs.Further simulations are in progress.The experimental analysis will be enriched also by information obtained inspecting the ImF-ImF correlation function,in order to elucidated the nature of space-time decay property of the emitting source associated with events having the largest ImF multiplicity.

关键词：多重碎裂中心碰撞蒸发过程 meV 竞争熔合国际货币基金组织事件分析

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浅埋深中厚煤层预掘回撤通道支护技术研究与应用

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煤炭技术 2024年第1期43卷 1-4页

作者：胡滨煤炭科学研究总院开采研究分院北京100013 中煤科工开采研究院有限公司北京100013

为进一步提高综采工作面末采回撤速度、确保设备回撤空间,采用理论计算、现场试验相结合的方法对浅埋深中厚煤层预掘回撤通道支护技术进行初步研究,建立了工作面残余煤柱承载力学模型,理论分析得知残余煤柱宽度对煤柱承载性能的时空演... 详细信息

为进一步提高综采工作面末采回撤速度、确保设备回撤空间,采用理论计算、现场试验相结合的方法对浅埋深中厚煤层预掘回撤通道支护技术进行初步研究,建立了工作面残余煤柱承载力学模型,理论分析得知残余煤柱宽度对煤柱承载性能的时空演化规律具有重要影响,末采期间残余窄煤柱出现区域性脆性破坏失稳状态是导致超前采动应力、顶板岩层断裂线前移的主要原因。现场试验末采段残余煤柱宽度约5 m时,整条窄煤柱在多重载荷作用下发生屈服,进而呈现大面积失稳破碎状态,巷内支护体承载受力急剧增加,锚索最大受力约为225 kN,最大顶底板移近量出现在通道中部靠工作面侧,约为100 mm,结果表明,采用高预应力强力锚杆(索)联合支护结构配合垛式支架外部支撑,可有效控制末采期间预掘回撤通道顶底板之间的闭合位移,为类似条件下预掘回撤通道支护提供工程借鉴。

关键词：浅埋深预掘回撤通道残余煤柱断裂线应力

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Performance and calibration of quark/gluon-jet taggers using 140 fb^(-1) of pp collisions at √s=13 TeV with the ATLAS detector

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Chinese Physics C 2024年第2期48卷 1-25页

作者： G. Aad B. Abbott K. Abeling N.J. Abicht S.H. Abidi A. Aboulhorma H. Abramowicz H. Abreu Y. Abulaiti B.S. Acharya C. Adam Bourdarios L. Adamczyk S.V. Addepalli m.J. Addison J. Adelman A. Adiguzel T. Adye A.A. Affolder Y. Afik m.N. Agaras J. Agarwala A. Aggarwal C. Agheorghiesei A. Ahmad F. Ahmadov W.S. Ahmed S. Ahuja X. Ai G. Aielli A. Aikot m. Ait Tamlihat B. Aitbenchikh I. Aizenberg m. Akbiyik T.P.A. Åkesson A.V. Akimov D. Akiyama N.N. Akolkar K. Al Khoury G.L. Alberghi J. Albert P. Albicocco G.L. Albouy S. Alderweireldt m. Aleksa I.N. Aleksandrov C. Alexa T. Alexopoulos F. Alfonsi m. Algren m. Alhroob B. Ali H.m.J. Ali S. Ali S.W. Alibocus m. Aliev G. Alimonti W. Alkakhi C. Allaire B.m.m. Allbrooke J.F. Allen C.A. Allendes Flores P.P. Allport A. Aloisio F. Alonso C. Alpigiani m. Alvarez Estevez A. Alvarez Fernandez m. Alves Cardoso m.G. Alviggi m. Aly Y. Amaral Coutinho A. Ambler C. Amelung m. Amerl C.G. Ames D. Amidei S.P. Amor Dos Santos K.R. Amos V. Ananiev C. Anastopoulos T. Andeen J.K. Anders S.Y. Andrean A. Andreazza S. Angelidakis A. Angerami A.V. Anisenkov A. Annovi C. Antel m.T. Anthony E. Antipov m. Antonelli F. Anulli m. Aoki T. Aoki J.A. Aparisi Pozo m.A. Aparo L. Aperio Bella C. Appelt A. Apyan N. Aranzabal S.J. Arbiol Val C. Arcangeletti A.T.H. Arce E. Arena J-F. Arguin S. Argyropoulos J.-H. Arling O. Arnaez H. Arnold G. Artoni H. Asada K. Asai S. Asai N.A. Asbah J. Assahsah K. Assamagan R. Astalos S. Atashi R.J. Atkin m. Atkinson H. Atmani P.A. Atmasiddha K. Augsten S. Auricchio A.D. Auriol V.A. Austrup G. Avolio K. Axiotis G. Azuelos D. Babal H. Bachacou K. Bachas A. Bachiu F. Backman A. Badea P. Bagnaia m. Bahmani A.J. Bailey V.R. Bailey J.T. Baines L. Baines O.K. Baker E. Bakos D. Bakshi Gupta V. Balakrishnan R. Balasubramanian E.m. Baldin P. Balek E. Ballabene F. Balli L.m. Baltes W.K. Balunas J. Balz E. Banas m. Bandieramonte A. Bandyopadhyay S. Bansal L. Barak m. Barakat E.L. Barberio D. Barberis m. Barbero m.Z. Barel K.N. Barends T. Barillari m-S. Barisits T. Barklow P. Baron D.A. Baron mo The ATLAS Collaboration

The identification of jets originating from quarks and gluons,often referred to as quark/gluon tagging,plays an important role in various analyses performed at the Large Hadron Collider,as Standard model measurements and searches for new particles decaying to quarks often rely on suppressing a large gluon-induced background.This paper describes the measurement of the efficiencies of quark/gluon taggers developed within the ATLAS Collaboration,using √s=13 TeV proton–proton collision data with an integrated luminosity of 140 fb^(-1) collected by the ATLAS experiment.Two taggers with high performances in rejecting jets from gluon over jets from quarks are studied:one tagger is based on requirements on the number of inner-detector tracks associated with the jet,and the other combines several jet substructure observables using a boosted decision tree.A method is established to determine the quark/gluon fraction in data,by using quark/gluon-enriched subsamples defined by the jet pseudorapidity.Differences in tagging efficiency between data and simulation are provided for jets with transverse momentum between 500 GeV and 2 TeV and for multiple tagger working points.

关键词： ATLAS JET QUARK GLUON TAGGING

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On Spiral Waves Arising in Natural Systems

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Communications in Computational Physics 2010年第8期8卷 610-622页

作者： D.bini C.Cherubini S.Filippi A.Gizzi P.E.Ricci Istituto per le Applicazioni del Calcolo“m.Picone” CNR I-00161 RomeItaly International Center for Relativistic Astrophysics-I.C.R.A. University of Rome“La Sapienza”I-00185 RomeItaly Nonlinear Physics and mathematical modeling Lab Faculty of EngineeringUniversity Campus Bio-MedicoI-00128 RomeItaly Alberto Sordi Foundation-Research Institute on Aging I-00128 RomeItaly mathematics Department University of Rome“La Sapienza”I-00185 RomeItaly

Spiral waves appear in many different natural contexts:excitable biological tissues,fungi and amoebae colonies,chemical reactions,growing crystals,fluids and gas eddies as well as in galaxies.While the existing theories explain the presence of spirals in terms of nonlinear parabolic equations,it is explored here the fact that selfsustained spiral wave regime is already present in the linear heat operator,in terms of integer Bessel functions of complex argument.Such solutions,even if commonly not discussed in the literature because diverging at spatial infinity,play a central role in the understanding of the universality of spiral process.In particular,we have studied how in nonlinear reaction-diffusion models the linear part of the equations determines the wave front appearance while nonlinearities are mandatory to cancel out the blowup of solutions.The spiral wave pattern still requires however at least two cross-reacting species to be physically realized.Biological implications of such a results are discussed.

关键词： Reaction-diffusion equations biophysics crystal growth heat transfer

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molybdenum sputtering film characterization for high gradient accelerating structures

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Chinese Physics C 2013年第9期37卷 73-79页

作者： S.bini B.Spataro A.marcelli S.Sarti V.A.Dolgashev S.Tantawi A.D.Yeremian Y.Higashi m.G.Grimaldi L.Romano F.Rufno R.Parodi G.Cibin C.marrelli m.migliorati C.Caliendo INFN - LNF Via E. Fermi 40Frascati (RM) 00044 Italy NSRL University of Science and Technology of China Chinese Academy of Sciences University of Rome-Sapienza Dipartimento di FisicaPiazzale Aldo Moro 5Rome 00185Italy SLAC National Accelerator Laboratory 2575 Sand Hill RoadMenlo ParkCA 94025USA KEK 1-1 Oho TsukubaIbaraki 305Japan University of Catania Dipartimento di Fisica e Astronomia & MATIS-IMM-CNRVia S. Sofia 64Catania 95123Italy INFN-Genova Via Dodecaneso 33Genova 16146Italy Diamond Light Source ChiltonDidcotOxford OX110DEUK University of Roma-Sapienza Dipartimento di Scienze di Base e Applicate per l’IngegneriaVia A. ScarpaRoma 14-00161-Italy Istituto dei Sistemi Complessi ISC-CNRArea della Ricerca di Roma 1Via Salaria km 29.300MonterotondoRome 00040Italy

Technological advancements are strongly required to fulfill the demands of new accelerator devices with the highest accelerating gradients and operation reliability for the future colliders. To this purpose an extensive R^zD regarding molybdenum coatings on copper is in progress. In this contribution we describe chemical composition, deposition quality and resistivity properties of different molybdenum coatings obtained via sputtering. The deposited films are thick metallic disorder layers with different resistivity values above and below the molibdenum dioxide reference value. Chemical and electrical properties of these sputtered coatings have been characterized by Rutherford backscattering, XANES and photoemission spectroscopy. We will also consider multiple cells standing wave section coated by a molybdenum layer designed to improve the performance of X-Band accelerating systems.

关键词： linear accelerator cavities X-band coatings XANES resistivity

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Development of X-band accelerating structures for high gradients

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Chinese Physics C 2012年第7期36卷 639-647页

作者： S. bini V. Chimenti A. marcelli L. Palumbo B. Spataro V. A. Dolgashev S. Tantawi A. D. Yeremian Y. Higashi m. G. Grimaldi L. Romano F. Ruffino R. Parodi INFN-LNF Via E. Fermi 40 00044 Frascati (RM) Italy University of Rome Sapienza Dipartimento di EnergeticaVia A. Scarpa 14 00185 Rome Italy SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park CA 94025 USA KEK 1-1 Oho Tsukuba Ibaraki 305 Japan University of Catania Dipartimento di Fisica e Astronomia & MATIS-IMM-CNRVia S. Sofia 64 95123 Catania Italy INFN-Genova Via Dodecaneso 33 16146 Genova Italy

Short copper standing wave （SW） structures operating at an X-band frequency have been recently designed and manufactured at the Laboratori Nazionali di Frascati of the Istituto Nazionale di Fisica Nucleare （INFN） using the vacuum brazing technique. High power tests of the structures have been performed at the SLAC National Accelerator Laboratory. In this manuscript we report the results of these tests and the activity in progress to enhance the high gradient performance of the next generation of structures, particularly the technological characterization of high performance coatings obtained via molybdenum sputtering.

关键词： high-gradients soft X-ray FEL RF cavities for particle accelerators RF sputtering

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用微分脉冲极谱法测定天然水中纤克/毫升级锰

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新疆环境保护 1988年第1期 39-44页

作者： m.P.Co lom bini 许孙曲

本文论述了以微分脉冲极谱法为基础用于测定淡水,河口水和海水中纤克/毫升级的锰的方法,用柠檬酸盐——硼酸盐溶液将水样绥冲在pH9.5,该缓冲液也用作支持电介质。该法不受天然水中可能存在的潜在干扰化合物的影响。而且,铁(在抗坏血酸... 详细信息

本文论述了以微分脉冲极谱法为基础用于测定淡水,河口水和海水中纤克/毫升级的锰的方法,用柠檬酸盐——硼酸盐溶液将水样绥冲在pH9.5,该缓冲液也用作支持电介质。该法不受天然水中可能存在的潜在干扰化合物的影响。而且,铁(在抗坏血酸盐——硼酸盐缓冲溶液中,pH9.5)或铬(在抗坏血酸盐——氨——氯化铵缓冲溶液中,pH9.8)可与锰一起测定。报道了阿诺(Arno)河中锰、铁和铬的浓度的某些测定结果。

关键词：抗坏血酸盐微分脉冲极谱法测量方法缓冲溶液天然水中纤

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KLOE 高分辨电磁量能器

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核电子学与探测技术 1997年第5期17卷 384-389页

作者： m.Antonelli F.Anulli G.Barbiellini S.Bertolucci C.bini C.Bloise R.Caloi G.Cabibbo P.Campana F.Cervelli G.DeZorzi G.DiCosimo A.DiDomen? 中国科学院高能物理所

本文描述了ＫＬＯＥ高分辨电磁量能器的设计和结构，着重介绍了获得铅和闪烁光纤取样量能器优良性能的关键技术。为了研究这种量能器的性能，建造了２ｈ和一个全尺寸的量能器模块，其中两个小模块分别是一个桶部模块和一个端盖模块。本... 详细信息

本文描述了ＫＬＯＥ高分辨电磁量能器的设计和结构，着重介绍了获得铅和闪烁光纤取样量能器优良性能的关键技术。为了研究这种量能器的性能，建造了２ｈ和一个全尺寸的量能器模块，其中两个小模块分别是一个桶部模块和一个端盖模块。本文给出了这三个模块的实验结果。

关键词：电磁量能器闪烁光纤光导能量分辨时间分辨

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闭循环致冷机低温泵的特性

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真空 1981年第5期 70-71页

作者：任家生 ,m.Benini ,P.morbidi ,Officine Glileo ,Via Carlo bini 44 ,Firenze

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以亚甲基蓝为杂交指示剂的电化学适配体鼠伤寒沙门氏菌传感技术

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中国农业科学 2018年第6期51卷 1192-1201页

作者：徐连应彭海霞邵玉宇王毕妮张富新陕西师范大学食品工程与营养科学学院

【目的】构建一种更具实用性的可定量检测鼠伤寒沙门氏菌的新型电化学适配体传感器,克服传统沙门氏菌检测方法在时效性、灵敏度和操作简便性等方面的不足。【方法】将反应制得的氧化石墨烯(GO)滴涂在玻碳电极(GCE)表面,于PBS缓冲液中采... 详细信息

【目的】构建一种更具实用性的可定量检测鼠伤寒沙门氏菌的新型电化学适配体传感器,克服传统沙门氏菌检测方法在时效性、灵敏度和操作简便性等方面的不足。【方法】将反应制得的氧化石墨烯(GO)滴涂在玻碳电极(GCE)表面,于PBS缓冲液中采用电化学还原法将其还原为还原氧化石墨烯(r GO),随后放置电极于氯金酸溶液中进行电沉积,于表面修饰一层纳米金(Au NPs)。依靠金硫键的作用将鼠伤寒沙门氏菌适配体互补链(S)固定在电极上,滴加封闭剂巯基己醇(mCH)占据电极表面空余位点,保证电极无非特异性吸附后,再将鼠伤寒沙门氏菌适配体(Apt)滴涂于电极表面,使S与Apt杂交形成DNA双链结构。将电极于37℃下同鼠伤寒沙门氏菌与核酸外切酶I(Exo I)的混合液孵育,依靠鼠伤寒沙门氏菌与Apt高度特异性结合,将Apt从电极表面带离,再基于Exo I对单链DNA的剪切作用,使鼠伤寒沙门氏菌得以循环重复作用于适配体,再将电极浸入亚甲基蓝(mB)溶液一段时间后,通过监测电极表面的电信号,并对其在菌液中的孵育时间及Exo I的浓度进行优化,构建检测鼠伤寒沙门氏菌的新型电化学适配体传感器。使用构建的传感器对大肠杆菌、金黄色葡萄球菌、志贺氏菌、单增李斯特菌以及副溶血弧菌进行检测,以确定该传感器的特异性;对2×102—2×107 cfu/m L的鼠伤寒沙门氏菌进行检测,以确定该传感器的敏感性;对猪肉样品进行鼠伤寒沙门氏菌的定量检测,以确定该传感器的实用性。【结果】所构建的鼠伤寒沙门氏菌电化学适配体传感器在菌液中的最适孵育时间为40 min,Exo I的最适浓度为0.8 U·μL-1。特异性试验结果表明,该传感器仅在鼠伤寒沙门氏菌存在时有电信号响应,而对非目标菌无响应。敏感性试验结果表明,该传感器具有很高的敏感性,对鼠伤寒沙门氏菌的敏感性可达67 cfu/m L。使用构建的鼠伤寒沙门氏菌电化学适配体传感器对猪肉中的鼠伤寒沙门氏菌进行定量检测,加标回收率在97.3%—106.7%。【结论】所构建的新型鼠伤寒沙门氏菌电化学适配体传感器具备灵敏度高、特异性强、易于操作、检测迅速及成本低廉等优点,有望应用于食品工业中鼠伤寒沙门氏菌的现场快速定量检测。

关键词：鼠伤寒沙门氏菌电化学适配体传感器还原氧化石墨烯纳米金亚甲基蓝核酸外切酶I

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