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Search for the doubly heavy baryons Ωbc0 and Ξbc0 decaying to Λc+π- and Ξc+π-

Chinese Physics C 2021年第9期45卷 14-25页

作者： R.Aaij C.Abellán Beteta T.Ackernley B.Adeva m.Adinolfi H.Afsharnia C.A.Aidala S.Aiola Z.Ajaltouni S.Akar J.Albrecht F.Alessio m.Alexander A.Alfonso Albero Z.Aliouche G.Alkhazov P.Alvarez Cartelle S.Amato Y.Amhis L.An L.Anderlini A.Andreianov m.Andreotti F.Archilli A.Artam.nov m.Artuso K.Arzymatov E.Aslanides m.Atzeni B.Audurier S.Bachm.nn m.Bachmayer J.J.Back P.Baladron Rodriguez V.Balagura W.Baldini J.Baptista Leite R.J.Barlow S.Barsuk W.Barter m.Bartolini F.Baryshnikov J.m.Basels G.Bassi B.Batsukh A.Battig A.Bay m.Becker F.Bedeschi I.Bediaga A.Beiter V.Belavin S.Belin V.Bellee K.Belous I.Belov I.Belyaev G.Bencivenni E.Ben-Haim A.Berezhnoy *** D.Berninghoff H.C.Bernstein C.Bertella A.Bertolin C.Betancourt F.Betti Ia.Bezshyiko S.Bhasin J.Bhom L.Bian m.S.Bieker S.Bifani P.Billoir m.Birch F.C.R.Bishop A.Bitadze A.Bizzeti m.Bj?rn m.P.Blago T.Blake F.Blanc S.Blusk D.Bobulska J.A.Boelhauve O.Boente Garcia T.Boettcher A.Boldyrev A.Bondar n.Bondar S.Borghi m.Borisyak m.Borsato J.T.Borsuk S.A.Bouchiba T.J.V.Bowcock A.Boyer C.Bozzi m.J.Bradley S.Braun A.Brea Rodriguez m.Brodski J.Brodzicka A.Brossa Gonzalo D.Brundu A.Buonaura C.Burr A.Bursche A.Butkevich J.S.Butter J.Buytaert W.Byczynski S.Cadeddu H.Cai R.Calabrese L.Calefice L.Calero Diaz S.Cali R.Calladine m.Calvi m.Calvo Gomez P.Camargo magalhaes A.Camboni P.Campana A.F.Campoverde Quezada S.Capelli L.Capriotti A.Carbone G.Carboni R.Cardinale A.Cardini I.Carli P.Carniti L.Carus K.Carvalho Akiba A.Casais Vidal G.Casse m.Cattaneo G.Cavallero S.Celani J.Cerasoli A.J.Chadwick m.G.Chapm.n m.Charles Ph.Charpentier G.Chatzikonstantinidis C.A.Chavez Barajas m.Chefdeville C.Chen S.Chen A.Chernov V.Chobanova S.Cholak m.Chrzaszcz A.Chubykin V.Chulikov P.Ciambrone m.F.Cicala X.Cid Vidal G.Ciezarek P.E.L.Clarke m.Clem.ncic H.V.Cliff J.Closier J.L.Cobbledick V.Coco J.A.B.Coelho J.Cogan E.Cogneras L.Cojocariu P.Collins T.Colombo L.Congedo A.Contu n.Cooke G.Coombs G.Corti C.m.Costa Sobral B.Couturier D.C.Craik J.Crkovská m.Cruz Torres R.Currie C.L.Da Silva E.Dall'Occo J.Dalseno C.D'Amb University of Edinburgh Horia Hulubei national Institute of Physics and nuclear Engineering InFn Sezione di Bari Università di Bari Los Alamos national Laboratory (LAnL) Van Swinderen Institute University of Groningen Universiteit maastricht AGH-University of Science and Technology Faculty of Physics and Applied Computer Science Université Clerm.nt Auvergne Università di Cagliari Institute for nuclear Research of the national Academy of Sciences (KInR) School of Physics University College Dublin nSC Kharkiv Institute of Physics and Technology (nSC KIPT) InFn Sezione di Perugia STFC Rutherford Appleton Laboratory School of Physics and Astronomy m.nash University novosibirsk State University CnRS/In2P3 Departm.nt of Physics and Astronomy Uppsala University Università di Genova School of Physics State Key Laboratory of nuclear Physics and Technology Peking University national Center for nuclear Research (nCBJ) Università di Roma Tor Vergata Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) Universidade Federal do Triangulo m.neiro (UFTm) Institute of Particle Physics LPC Central China normal University Hangzhou Institute for Advanced Study UCAS Instituto de Fisica Corpuscular Centro mixto Universidad de Valencia-CSIC nikhef national Institute for Subatomic Physics and VU University Amsterdam national Research Tomsk Polytechnic University AGH-University of Science and Technology Faculty of Computer Science Electronics and Telecomm.nications University of michigan Università di Siena Università di Padova Scuola normale Superiore national Research Centre Kurchatov Institute Università degli Studi di milano mSU-Iligan Institute of Technology (mSU-IIT) Università di Firenze InFn Sezione di Roma La Sapienza Institut für Physik Universit?t Rostock InFn Sezione di milano Departam.nto de Fisica Universidad nacional de Colombia Universit?t Bonn-Helmholtz-Institut für Strahlen und Kernphysik Hanoi University of Science Università di Pisa P.n. Lebedev Physical Institute Russian Academy of Science (LPI RAS) Università

The first search for the doubly heavy Ωbc0baryon and a search for the Ξbc0baryon are performed using pp collision data collected via the LHCb experim.nt from 2016 to 2018 at a centre-of-mass energy of 13 TeV,corresponding to an integrated lum.nosity of 5.2 *** baryons are reconstructed via their decays to ∧c+π-andΞc+π-.no significant excess is found for invariant masses between 6700 and 7300 meV/c2,in a rapidity range from2.0 to 4.5 and a transverse mom.ntum range from 2 to 20 meV/*** limits are set on the ratio of the Ωbc0andΞbc0production cross-section times the branching fraction to ∧c+π-（Ξc+π-） relative to that of the ∧b0（Ξb0） baryon,for different lifetime hypotheses,at 95% confidence *** upper limits range from 0.5×10-4to 2.5×10-4for theΩbc0→∧c+π-(Ξbc0→∧c+π-) decay,and from 1.4×10-3to 6.9×10-3for the Ωbc0→Ξc+π-(Ξbc0→Ξc+π-) decay,depending on the considered mass and lifetime of the Ωbc0(Ξbc0) baryon.

关键词： B physics quarkonium spectroscopy heavy quark production

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The effects of self-fields on the electron trajectory in a two-stream free electron laser with a helical wiggler and an axial guiding magnetic field

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Chinese Physics B 2012年第10期21卷 251-254页

作者： S.Saviz E.Lashani Farzin m.Aghamir Plasma Physics Research Center Science and Research BranchIslamic Azad UniversityTehranP.O.Box 14665-678Iran Departm.nt of Physics University of TehranN.Kargar AveTehran 14399Iran

A theory for the two-stream free-electron laser（TSFEL） with a helical wiggler and an axial guide magnetic field is *** the analysis,the effects of self-fields are taken into *** analysis of the two-stream steady-state electron trajectories is given by solving the equation of *** calculations show that there are seven groups of orbits in the presence of self-fields instead of two groups reported in the absence of *** stability of the trajectories is studied numerically.

关键词： two-stream free electron laser electron trajectory

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RESPIRATORY STUDIES In CHROnIC mOUnTAIn SICKnESS:THE PERUVIAn EXPERIEnCE

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青海医学院学报 2005年第4期26卷 217-222,239页

作者： Fabiola León-Velarde Departm.nt of Biological and Physiological Sciences Faculty of Sciences and Philosophy/ IIA Cayetano Heredia University Lima-Perú

Chronic mountain Sickness (CmS) is a multifactorial disease caused by a limited capacity to achieve complete adaptation to life under chronic hypoxic conditions. It is accompanied by excessive erythrocitosis (levels of erythrocytes above the normal value set for each altitude), and in advances cases also by pulm.nary hypertension. The hypoxemia, caused by central or peripheral respiratory disorders and/or associated to diverse risk factors, produces the excessive erythrocytosis. The most comm.n symptoms are headaches, dizziness, breathlessness, sleep disturbances, tinnitus, physical and m.ntal fatigue, anorexia, and bone and muscle pain. The most comm.n signs are an intermittent or perm.nent cyanosis, hyperemia and venous dilatation in hands or feet (m.nge-m et al., 1928; Winslow and m.nge-C, 1987). Aging, respiratory diseases, sleep, m.nopause, and overweight has proved to be additional risk factors in the developm.nt of CmS (Kryger et al., 1978; León-Velarde et al., 1993; Sime et al., 1975; León-Velarde et al., 1997; León-Velarde et al., 2001; m.nge-C et al., 1992; norm.nd et al., 1992)

关键词： Figure RESPIRATORY STUDIES In CHROnIC mOUnTAIn SICKnESS body

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STRUCTURAL DETERm.nATIOn OF TITAnIUm-OXIDE nAnOPARTICLES BY X-RAY ABSORPTIOn SPECTROSCOPY

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Acta metallurgica Sinica(English Letters) 2002年第1期15卷 53-57页

作者： Z.Y. Wu J. Zhang K. Ibrahim m.I. Abbas G. Li Y. Tao T.D. Hu F.Q. Liu H.J. Qian Y.n. Xie Q.H. Zhang L. Gao Z.Z. Chen Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsThe Chinese Academy of SciencesBeijing 100039China Laboratori nazionali di Frascati Istituto Nazionali di Fisica Nucleare Via Enrico Fermi 40P.O. Box 13I-00044 FrascatiItaly Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsThe Chinese Academy of Sciences Beijing 100039China Shanghai Institute of Ceramics The Chinese Academy of SciencesShanghai200050China

As a potential application of titanium-oxide nanoparticles, it is extremely important to investigate a detailed picture of the surface and interior structural properties of nanocrystalline materials, such as rutile and anatase with diameters 7.0 and 4.5nm, respectively. X-ray absorption spectroscopy has been used to identify the local Ti environm.nt and related electronic structure. We combine the experim.ntal results at the Ti edge in both bulk and nano-crystals to determ.ne the lattice distortion in terms of differently characteristic preedge features and the variation in the multiple-scattering region of X-ray absorption near-edge structure (XAnES) spectra. The relationship between the transition peaks and the surface-to volume ratio is also discussed.

关键词： X-ray absorption near edge structure nano particle transition metal oxide

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Synthesis of advanced ceramics by hydrothermal crystallization and modified related methods

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Journal of Advanced Ceramics 2012年第3期1卷 204-220页

作者： JoséORTIZ-LAnDEROS Carlos GÓmEZ-YÁÑEZ Rigoberto LÓPEZ-JUÁREZ Iván DÁVALOS-VELASCO Heriberto PFEIFFER Departam.nto de Ingeniería metalúrgica Escuela Superior de Ingeniería Química e Industrias ExtractivasIPNUPALMAv.Instituto Politécnico Nacional s/nCP 07738México DFMéxico. Centro de Ciencias Aplicadas y Desarrollo Tecnológico Universidad Nacional Autónoma de MéxicoA.P.70-186CoyoacánMéxico D.F.México. Instituto de Investigaciones en materiales Universidad Nacional Autónoma de MéxicoCircuito exterior s/nCiudad UniversitariaDel.CoyoacánCP 04510México DFMéxico.

The present article aims to give a brief overview about the advantages of the hydrothermal crystallization method for the synthesis of advanced *** is given,not only on the conventional hydrothermal crystallization,but also on some of its variants;such as ultrasound-assisted,electrochemical-assisted,microwave-assisted and surfactant-assisted hydrothermal methods which open up new opportunities for the synthesis of ceramic materials with novel properties dem.nded for advanced *** the current work the synthesis of barium titanate(BaTiO3),lithium metasilicate(Li2SiO3)and sodium-potassium.niobate(na,K)nbO3 powders are reported as cases of study.

关键词： hydrothermal synthesis barium titanate Li_(2)SiO_(3) potassium-sodium.niobate

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辽宁阜新排山楼金矿区岩浆岩锆石SHRImP定年及其意义

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地球化学 2001年第5期30卷 483-490页

作者：罗镇宽苗来成关康裘有守 Y.m.Qiu n.J.m.naughton D.I.Groves 天津地质研究院中国科学院地质与地球物理研究所北京100029 Centre for Strategic m.neral Deposits Department of Geology amd Geophysicsthe University of Western Australia

采用先进的SHRImP定年技术对辽宁阜新排山楼金矿区成矿前变形的闪长玢岩脉、变形花岗斑岩脉、成矿后的闪长玢岩脉和大石头沟黑云母花岗岩的锆石进行了U-Pb年龄测定,获成矿前变形闪长玢岩脉的206Pb/238Pb年龄为(126±2)ma;变形花岗斑岩脉... 详细信息

采用先进的SHRImP定年技术对辽宁阜新排山楼金矿区成矿前变形的闪长玢岩脉、变形花岗斑岩脉、成矿后的闪长玢岩脉和大石头沟黑云母花岗岩的锆石进行了U-Pb年龄测定,获成矿前变形闪长玢岩脉的206Pb/238Pb年龄为(126±2)ma;变形花岗斑岩脉为(124±1)ma;成矿后的闪长玢岩脉为(125±1)ma;大石头沟黑云母花岗岩为(124±1)ma。这4类岩浆岩的年龄在误差允许范围内可基本视为同时代的。这一结果揭示,排山楼韧性剪切带型金矿床是中生代燕山晚期形成的,这与前人采用Ar-Ar法测得矿石蚀变黑云母的年龄犤(124.4±0.391)ma犦是一致的。这表明,在中国东部,许多产在前寒武系岩层中、受韧性剪切带控制的金矿床形成时代是中生代燕山晚期。广泛产在胶东、辽西北票—蒙东赤峰、河北张家口和内蒙古乌拉山等地区的金矿床都主要是中生代燕山晚期形成的,表明燕山晚期是中国东部最重要的金矿化期。

关键词： SHRImP定年岩浆岩金矿床燕山期辽宁形成时代韧性剪切带中生代

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Kp Pan Evaporation and ETo m.nthly maps Using Information of 60 Weather Observatories Included in the Climate normals (1941-1970) from mexico

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Journal of Water Resource and Protection 2014年第15期6卷 1475-1500页

作者： martín m.ndo-molina Investigation Centre Faculty of Engineer Autonomous University of Chiapas Tuxtla Gutiérrez Mexico

The most precise equation in order to estimate the evapotranspiration (ET) of crops is the Penm.n-m.nteith (Pm). However, the Pm equation needs specific data that, in the majority of mexico’s irrigation districts, it is not available because there are few automated weather stations. For this reason, it is convenient to develop simple methods that allow to precise estimation of ET. A reliable way to estimate ET is by using the pan evaporation that, according to the revised literature, continues to be used nowadays. Investigators like to include its use in irrigation water m.nagem.nt projects in various parts of the world. However, this method uses Kp from the FAO that is not calibrated in mexico. The use of FAO Kp affects the precision of the results, since some variables like radiation, wind, temperature and relative humidity vary from place to place;therefore ET is under estimated or overestimated. This paper presents an original contribution across method to estimate “Kp pan evaporation and ETo m.nthly maps”, using information from 60 weather observatories included in The Climate normals (1941-1970) from mexico, based on the Pm method and the class A pan evaporation. Once the Kp values were obtained from each weather observatory, the Kringing method was used. This way, by interpolating data of the triad “latitude, longitude and Kp” and “latitude, longitude and ET”, m.nthly normalized maps of Kp and ET were established for mexico, except the upland areas (Sierra madre Occidental and Sierra madre Oriental), as well as other highland zones above 2700 meters over sea level, for the highest observatory is located in Toluca, State of mexico (key 14-0039), at 2680 m over sea level.

关键词： Reference Evapotranspiration Pan Evaporation Kp Pan Evaporation

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冀东都山花岗岩基及相关花岗斑岩脉SHRImP锆石U-Pb法定年及其意义

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地球化学 2003年第2期32卷 173-180页

作者：罗镇宽苗来成关康裘有守 Y.m.Qiu n.J.m.naughton D.I.Groves 天津地质研究院天津300061 中国科学院地质与地球物理研究所北京100029 CentreforStrategicm.neralDeposits

都山花岗岩体是冀东地区最大的花岗岩基,在其周边产有众多与其有关的“卫星”岩体和岩脉。采用先进的SHRImP定年方法,测得都山花岗岩基的206Pb/238U年龄为(223±2)ma,其东侧三家金矿区成矿前花岗斑岩脉的年龄为(222±4)ma,二者在误差范... 详细信息

都山花岗岩体是冀东地区最大的花岗岩基,在其周边产有众多与其有关的“卫星”岩体和岩脉。采用先进的SHRImP定年方法,测得都山花岗岩基的206Pb/238U年龄为(223±2)ma,其东侧三家金矿区成矿前花岗斑岩脉的年龄为(222±4)ma,二者在误差范围内一致,花岗岩基和花岗斑岩脉可视为同一次岩浆活动的产物。这种晚古生代末—早中生代印支期的花岗岩在华北克拉通北缘广泛分布,显示它是一次重要的构造-岩浆事件的产物。根据岩石化学和微量元素特征及有关判别图,都山等印支期花岗岩可能属中朝板块与西伯利亚板块碰撞造山作用的后碰撞花岗岩。花岗斑岩脉中发现有新太古代的继承锆石,表明花岗斑岩的部分源岩为区内新太古代八道河岩群变质岩。都山花岗岩与花岗斑岩脉同时、同源,推测其源岩也有部分为新太古代结晶基底的变质岩。花岗岩与区内金矿化有较大的时差,两者不存在直接的成因联系,仅表明成矿晚于早中生代印支期。

关键词：花岗岩基花岗斑岩脉 SHRImP定年河北锆石岩浆活动

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Dissecting the native Architecture and Dynamics of Cyanobacterial Photosynthetic machinery

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molecular Plant 2017年第11期10卷 1434-1448页

作者： Selene Casella Fang Huang David mason Guo-Yan Zhao Giles n. Johnson Conrad W. mullineaux Lu-ning Liu Institute of Integrative Biology University of Liverpool Crown Street Liverpool L69 7ZB UK Centre for Cell Imaging University of Liverpool Crown Street Liverpool L69 7ZB UK College of Life Science Shandong Normal University Jinan 250014 P. R. China School of Earth and Environm.ntal Sciences University of Manchester Oxford Road Manchester M13 9PT UK School of Biological and Chemical Sciences Queen Mary University of London Mile End Road London E1 4NS UK

The structural dynamics and flexibility of cell membranes play fundam.ntal roles in the functions of the cells, i.e., signaling, energy transduction, and physiological adaptation. The cyanobacterial thylakoid membrane represents a model membrane that can conduct both oxygenic photosynthesis and respiration simultaneously. In this study, we conducted direct visualization of the global organization and mobility of photosynthetic complexes in thylakoid membranes from a model cyanobacterium, Synechococcus elongatus PCC 7942, using high-resolution atomic force, confocal, and total internal reflection fluorescence microscopy. We visualized the native arrangem.nt and dense packing of photosystem I （PSI）, photosystem II （PSlI）, and cytochrome （Cyt） befwithin thylakoid membranes at the molecular level. Furthermore, we func- tionally tagged PSI, PSlI, Cyt bef, and ATP synthase individually with fluorescent proteins, and revealed the heterogeneous distribution of these four photosynthetic complexes and determ.ned their dynamic features within the crowding membrane environm.nt using live-cell fluorescence imaging. We characterized red light-induced clustering localization and adjustable diffusion of photosynthetic complexes in thylakoid membranes, representative of the reorganization of photosynthetic apparatus in response to environm.ntal changes. Understanding the organization and dynamics of photosynthetic membranes is essential for rational design and construction of artificial photosynthetic systems to undarpin bioenergy developm.nt. Knowledge of cyanobacterial thylakoid membranes could also be extended to other cell membranes, such as chloroplast and mitochondrial membranes.

关键词： cyanobacteria thylakoid membrane atomic force microscopy photosynthesis fluorescence imaging protein dynamics

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Photochemical Decomposition of Pesticide Chemicals in Aerosol Particles and Thin Films Relevant to Environm.ntal Conditions

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Journal of Chemistry and Chemical Engineering 2014年第3期8卷 286-301页

作者： Yuri n. Samsonov Siberian Branch of the Russian Academy of Sciences Institute of Chemical Kinetics and Combustion Novosibirsk 630090 Russia

Contam.nation of the environm.nt by pesticides is the inevitable aftermath of plant protection, and a substantial portion of pesticide pollutants exists in the form of aerosol particles levitated in the air and deposited on plants, and as the pesticide residues （thin films） on the surface of plant leaves. The sunlight photolysis could be the resource for the accelerated photochemical decomposition of pesticide compounds to m.nimize the long-term environm.ntal contam.nation. The rates of photochemical decomposition of pesticide chemicals propiconazole （commercial formulation Tilt） and haloxyfop-ethoxyethyl （Zellek） were measured in particles of 0.12-1.3 μm in diameter and in films 0.04-0.2 μm thick. A specific polyaromatic sensitizer Shirvanol was used to induce accelerated decomposition of the above pesticide particulates under both the solar radiation and the artificial UV light. It was established that propiconazole decomposes by the sensitized photo-oxidation only, but haloxyfop-ethoxyethyl reacts in both the oxygen （air） and oxygen-free mediums via both the direct and sensitized reactions. The photochemical mechanisms are hypothesized and argued for the oxidative and non-oxidative decompositions. The haloxyfop-ethoxyethyl （Zellek） residues lbrmed on foliage upon pesticide treatm.nts of agricultural fields would essentially decompose under sunlight via a direct photoreaction in 4-6 weeks, but the propiconazole （Tilt） contam.nants probably need more time.

关键词： Pesticide propiconazole haloxyfop-ethoxyethyl aerosol particles thin films photochemical decomposition.

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