检索结果-南通市图书馆

A non-relativistic model for the[cc]■ tetraquark

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2019年第1期43卷 36-55页

作者： v.R.Debastiani F.S.navarra Departamento de Física Teórica and IFIC Centro Mixto Universidad de Valencia-CSIC Institutos de Investigación de Paterna Instituto de Física Universidade de Sa?o Paulo Institut de Physique théorique Université Paris SaclayCEA CNRS

We use a non-relativistic model to study the spectroscopy of a tetraquark composed of [cc]■ in a diquark-antidiquark *** numerically solving the Schr?dinger equation with a Cornell-inspired potential,we separate the four-body problem into three two-body ***-dependent terms(spin-spin,spin-orbit and tensor)are used to describe the splitting structure of the ■ spectrum and are also extended to the interaction between *** experimental data on charmonium states are used to fix the parameters of the model and a satisfactory description of the spectrum is *** find that the spin-dependent interaction is sizable in the diquark-antidiquark system,despite the heavy diquark mass,and also that the diquark has a finite size if treated in the same way as the ■ *** find that the lowest S-wave T 4c tetraquarks might be below their thresholds of spontaneous dissociation into low-lying charmonium pairs,while orbital and radial excitations would be mostly above the corresponding charmonium pair ***,we repeat the calculations without the confining part of the potential and obtain bound diquarks and bound *** might be relevant to the study of exotic charmonium in the quark-gluon *** T 4c states could be investigated in the forthcoming experiments at the LHC and BelleⅡ.

关键词： tetraquark charmonium diquark-antidiquark nonrelativistic spin

neutron Activation Analysis and Scanning Electron Microscopy of Phytoplankton in the Coastal Zone of Crimea (the Black Sea)

在线全文

学校读者我要写书评

暂无评论

American Journal of Analytical Chemistry 2014年第5期5卷 323-334页

作者： P. S. nekhoroshkov A. v. Kravtsova M. v. Frontasyeva Yu. n. Tokarev Department of Biophysical Ecology Department of Biotechnology and Phytoresources The A.O. Kovalevsky Institute of Biology of the Southern Seas of the National Academy of Science of the Ukraine Sevastopol Ukraine Sector of neutron Activation Analysis and Applied Research The Frank Laboratory of Neutron Physics Joint Institute for Nuclear Research Dubna Russia

the physiology and ecology of planktonic organisms are influenced by the concentration, chemical speciation and resulting bioavailability of some trace metals. the determination of the elemental structure of phytoplankton is important for interpretation of physiological and functional states of coastal ecosystems. the present study is focused on the structure and elemental composition of the phytoplankton assemblages from the different coastal zones by instrumental neutron activation analysis (InAA), scanning electron microscopy (SEM) and energy-dispersive X-ray spectrometry (EDS). For the first time these complementary techniques were simultaneously applied to study the Black Sea phytoplankton. the concentrations of 45 elements in the coastal phytoplankton communities used as bioindicator of inorganic contamination of the Black Sea coastal area near Sevastopol, Ukraine, were determined. Phytoplankton samples were collected by total tows of the plankton net with 35 μm pore size at 3 stations situated in polluted and relatively pristine water areas of the Sevastopol coastal zone during autumn period of the phytoplankton growth. the concentration of Mg, Al, Sc, Ti, v, Mn, As, Rb, Ba, th and Fe, Cr increases exponentially from relatively pristine station to more polluted station and 10-times and 3-times greater, respectively, in the phytoplankton of the Sevastopol Bay. the rare-earth elements have relatively the same concentration values less than 1 μg/g and tend to accumulate in the phytoplankton from the polluted station in the Sevastopol Bay. the obtained results are in a good agreement with the elemental concentration data in the oceanic plankton, plankton communities from the White Sea and the Black Sea. Using energy-dispersive X-ray spectrometry the mineral particles of unknown origin and impurities of copper (0.42% by weight) in the phytoplankton at the polluted station and zinc (0.57% by weight) at the relatively pristine station were determined.

关键词： Black Sea Phytoplankton Scanning Electron Microscopy neutron Activation Analysis Energy-Dispersive X-Ray Spectrometry Trace Elements

On the Enhancement of Wear Resistance of Hardened Carbon Tool Steel （AISI 1095） With Cryogenic Quenching

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

On The Enhancement of Wear Resistance of Hardened Carbon Too...

Jacobi polynomials and non-singlet structure function F_2 (x,Q^2) up to n^3LO

14～(th) Congress of International Federation for Heat Treament and Surface Engineering

作者： v.Soundararajan n.Alagurmurthi K.Palaniradja Department of Mechanical Engineering Pondicherry Engineering College India Department of Mechanical Engineering Pondicherry Engineering College India Department of Mechanical Engineering Pondicherry Engineering College India

＜正＞ many experimental investigations reveal that it is very difficult to have a completely martensitic structure by any hardening process. Some amount of austenite is generally present in the hardened steel. this austenite existing along with martensite is normally referred as the retained austenite. the presence of retained austenite greatly reduces the mechanical properties and such steels do not develop maximum hardness even after cooling at rates higher than the critical cooling rates. Strength can be improved in hardened steels containing retained austenite by a process known as cryogenic quenching. untransformed austenite is converted into martensite by this treatment. this conversion of retained austenite into martensite results in increased hardness, wear resistance and dimensional stability of steel. Wear can be defined as the progressive loss of materials from the operating surface of a body occurring as a result of relative motion at the surface. Hardness, load, speed, surface roughness, temperature are the major factors which influences wear. many studies on wear indicate that increasing hardness decreases the wear of a material. With this in mind, to study the surface wear on a surface modified （Cryogenic treated） steel material an attempt has been made in this paper. In this study as a Part-ⅠHardening was carried out on carbon tool steel （AISI 1095） of different L/D ratio with conventional quenchants like purified water, aqueous solution and Hot mineral oil. As a Part -Ⅱhardening was followed by quenching was carried out as said in Part-Ⅰand the hardened specimen were quenched in liquid nitrogen which is at sub zero condition. the specimens were tested for its microstructure, hardness and wear loss. the results were compared and analyzed. the alloying elements increases the content of retained austenite hence the material used was AISI1095 （Carbon 0.9%, Si 0.2%, Mn0.4% and the rest Iron）

关键词： AISI 1095 steel Liquid nitrogen Quenching Cryogenic Quenching Hardening

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Chinese Physics C 2010年第9期34卷 1479-1481页

作者： Ali n.Khorramian S.Atashbar Tehrani Physics Department Semnan University School of Particles and Accelerators Institute for Research in Fundamental Sciences (IPM)

In this paper we present the non-singlet QCD analysis to determine valence quark distribution up to four *** obtain the fractional difference between the 4-loop and the 1-,2and 3-loop presentations of xu v （x,Q^2） a... 详细信息

关键词： PDFs DIS data QCD fit

三种无创性方法早期诊断兔激素性股骨头坏死的对比研究

在线全文

学校读者我要写书评

暂无评论

中华实验外科杂志 2024年第3期41卷 614-618页

作者：王小龙赵建民赵晓娜甄志龙刘瑞张国梁李强满达郝廷内蒙古医科大学第二附属医院手足显微外科呼和浩特010010 内蒙古医科大学附属医院骨科呼和浩特010050 内蒙古妇幼保健院儿童保健科呼和浩特010020 内蒙古医科大学第二附属医院创伤骨科呼和浩特010010

目的比较磁共振成像(MRI)、^(99m)Tc-亚甲基二膦酸盐(^(99m)Tc-MDP)显像、^(99m)Tc-半胱氨酸-膜联蛋白v(^(99m)Tc-Cys-Annexin v,TP5-3)单光子发射计算机断层(SPECT)显像在激素性股骨头坏死(SIFHn)模型兔中的早期诊断价值。方法收集2022年1月至2022年12月36只新西兰大白兔,采用随机数字表法分为模型组20只、对照组16只。模型组通过注射马血清和激素建立早期动物模型,对照组注射等量生理盐水。分别于造模后的第2周、第4周分批进行MRI、^(99m)Tc-Cys-Annexin v显像及^(99m)Tc-MDP显像,影像学检查完毕行病理组织学观察验证。计量资料组间比较为t检验,计数资料组间比较为卡方检验。结果造模第2周(超早期阶段),模型组MRI和^(99m)Tc-MDP显像均未见骨坏死的异常信号,^(99m)Tc-Cys-Annexin v SPECT显像可见双侧股骨头异常放射性浓聚,其诊断价值高于MRI和^(99m)Tc-MDP显像。造模第4周(早期阶段),MRI、^(99m)Tc-MDP显像和^(99m)Tc-Cys-Annexin v SPECT显像均可检出骨坏死的异常信号,MRI检出阳性率[55.56%(5/9)]高于^(99m)Tc-MDP显像[44.44%(4/9)],而^(99m)Tc-Cys-Annexin v SPECT显像最低[33.33%(3/9)],三者比较差异无统计学意义(χ^(2)=0.90,P>0.05)。结论^(99m)Tc-Cys-Annexin v SPECT显像可在超早期检出SIFHn,但在早期仍推荐MRI检测。

关键词：激素性股骨头坏死诊断凋亡

Latest results from GRAAL collaboration

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2009年第12期33卷 1249-1253页

作者： v. vegna v. Bellini J.P. Bouquet L. Casano A. D'Angelo J.P. Didelez R. Di Salvo A. Fantini D. Franco G. Gervino F. Ghio G. Giardina B. Girolami A. Giusa M. Guidal E. Hourany A.S. Ignatov R. Kunnel A. Lapik A. Lleres P. Levi Sandri F. Mammoliti G. mandaglio M. manganaro M. Moricciani A.n. Mushkarenkov v.G. nedorezov C. Randieri D. Rebreyend n.v. Rudnev G. Russo C. Schaerf M.L. Sperduto M.C. Sutera A.Turinge Dip. di Fisica Università degli Studi di Roma 'Tor Vergata' via della Ricerca Scientifica 1 I-00133 Roma Italy InFn - Sezione di Roma 'Tor vergata' via della Ricerca Scientifica 1 I-00133 Roma Italy Dip. di Fisica e Astronomia Università di Catania via Santa Sofia 44 I-95123 Catania Italy InFn - Sezione di Catania via Santa Sofia 44 I-95123 Catania Italy LPSC Universit Joseph Fourier Grenoble 1 CNRS/IN2P3 Institut National Polytechnique de Grenoble 53 Avenue des Martyres 38026 Grenoble France IPnO Universit de Paris-Sud 11 CNRS/IN2P3 15 rue Georges Clemenceau 91406 Orsay France Dip. di Fisica Sperimentale Università di Torino via P.Giuria I-00125 Torino Italy InFn - Sezione di Torino via P.Giuria I-00125 Torino Italy Istituto Superiore di Sanità viale Regina Elena 299 I-00161 Roma Italy InFn - Sezione di Roma piazzale Aldo Moro 2 I-00185 Roma Italy Dip. di Fisica Universitàdi Messina salita Sperone 31 I-98166 Messina Italy Institute for nuclear Research RAS 117312 Moscow Russia InFn - Laboratori nazionali di Frascati via E.Fermi 40 I-00044 Frascati Italy InFn - Sezione di Catania via Santa Sofia 44 I-95123 Catania Italy

the GRAAL experimental set-up consists of a polarized and tagged photon beam that covers an energy range from a minimum of 600 Mev up to a maximum of 1500 Mev, of a liquid Hydrogen or Deuterium target and of the 4π Lagrange detector optimized for photon detection. It allows the study of pseudo-scalar and vector meson photoproduCtion on the nucleon in the energy range corresponding to the second and the third resonance regions. In the following, the ∑ beam asymmetries in η and π0 photoproduction on quasi-free nucleon are shown. Also single and double polarization observables in K＋A photoproduction on free proton are shown; they are important to confirm the role of new or poorly known resonances in the 1900 Mev mass region.

关键词： polarized photon meson photoproduction polarization observables

Environmental levels and toxicological potencies of a novel mixed halogenated carbazole

在线全文

学校读者我要写书评

暂无评论

Emerging Contaminants 2016年第3期2卷 166-172页

作者： Miren Pena-Abaurrea Matthew Robson Sri Chaudhuri nicole Riddell Robert McCrindle Brock Chittim Robert Parette un-Ho Jin Stephen Safe David Poirier Ralph Ruffolo Richard Dyer Rachael Fletcher Paul A..Helm Eric J.Reiner Department of Analysis CEPSA Research CenterAlcala de Henares28805Spain Department of Chemistry University of TorontoTorontoONM5S 3H6Canada Ontario Ministry of the Environment and Climate Change TorontoONM9P 3V6Canada Conservation Ontario NewmarketONL3Y 2P5Canada Department of Chemistry Brock UniversitySt.CatharinesONL2S 3A1Canada Wellington Laboratories Inc. GuelphONN1G 3M5Canada Department of Chemistry University of GuelphGuelphONN1G 2W1Canada Matson&Associates Inc.State CollegePA16801USA veterinary Medicine&Biomedical Sciences Texas A&M UniversityTexasTX77843e4461USA Ministry of northern Development and Mines SudburyONP3E 6B5Canada School of the Environment University of TorontoONM5S 3EBCanada

the present work involves an extensive analytical and toxicological description of a recently identified mixed halogenated carbazole found in sediment samples,1,8-dibromo-3,6-dichloro-9H-carbazole(BCCZ).Concentrations and the relative effect potency(REP)were calculated for the target BCCZ in a set of stream sediments collected in 2008 in Ontario,*** levels calculated for BCCZ as compared to those previously assessed for legacy persistent organic pollutants(POPs)in the same samples revealed a significant contribution of BCCZ to the total organic chemical contamination(verage 37%).the corresponding dioxin toxic equivalencies(TEQs)of BCCZ in the sediment extracts were estimated from experimental REP *** experimental data presented supports the classification of this emerging halogenated chemical as a contaminant of emerging environmental *** potential emission sources could not be identified,this study highlights the importance of on-going research for complete characterization of halogenated carbazoles and related compounds.

关键词： Halogenated carbazoles Levels GC×GC REP TEQ Dioxin-like Risk assessment Regulation

Oncolytic adenoviruses:A thorny path to glioma cure

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

Genes & Diseases 2014年第2期1卷 214-226页

作者： I.v.Ulasov A.v.Borovjagin B.A.Schroeder A.Y.Baryshnikov Swedish Medical Center Center for Advanced Brain Tumor Treatment55017th AvenueJames TowerSuite 570SeattleWA 98122USA Institute of Oral Health Research University of Alabama at Birmingham School of Dentistry19197th Ave SouthBirminghamAL35294USA Michigan State university College of Medicine Grand RapidsMI49503USA Institute of Experimental Diagnostic and Biotherapy N.N.Blokhin Cancer Research Center(RONC)Moscow 115478Russia 不详

Glioblastoma Multiforme(GBM)is a rapidly progressing brain *** the relatively low percentage of cancer patients with glioma diagnoses,recent statistics indicate that the number of glioma patients may have increased over the past *** therapeutic options for glioma patients include tumor resection,chemotherapy,and concomitant radiation therapy with an average survival of approximately 16 *** rapid progression of gliomas has spurred the development of novel treatment options,such as cancer gene therapy and oncolytic *** testing of oncolytic adenoviruses using glioma models revealed both positive and negative sides of the virotherapy *** we present a detailed overview of the glioma virotherapy field and discuss auxiliary therapeutic strategies with the potential for augmenting clinical efficacy of GBM virotherapy treatment.

关键词： Adenovirus Brain tumor Glioma Self-replicated vector Stem cells

AnODIC BEHAvIOUR CF LIthIUM In ALKALIME SOLUTIOnS!

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

ANODIC BEHAVIOUR CF LITHIUM IN ALKALIME SOLUTIONS!