Ba(d) o-Ba(d) o Mixing and New Physics Effects in a Top Quark Two-Higgs Doublet Model
第一届凝聚态物理会议
第一届凝聚态物理会议The 1st Conference on Condensed Matter Physics2015年7月15日- 17日清华大学目录01 会议概况02 组织委员会04 会议日程•总日程•大会报告•分会场报告•海报会场会议概况为了配合凝聚态物理在中国的迅速发展和国际地位的全面提升，进一步加强国内科研工作者在不同前沿领域的交流，推进国内和国际在凝聚态物理领域的相互交流和合作，为青年学生和研究人员学习和了解国际前沿进展创造更广泛的交流平台，拟定在过去已经成功举办了13届的“凝聚态理论与材料计算国际会议”系列会议的基础上，拓宽会议的主题，特别是加强凝聚态物理实验和理论的交流与融合，于2015年7月15日－17日在北京举办“第一届凝聚态物理会议”年会。
2015年第一届凝聚态物理会议是由清华大学物理系、中国科学院物理研究所、北京大学物理学院、量子物质科学协同创新中心联合主办。
这是国内首次在凝聚态物理方面举办的大型学术交流会。
本次会议是凝聚态理论与材料计算国际会议的延续和拓展，旨在增进国内外物理学者的学术交流，分享前沿科研成果，提高国内凝聚态物理的科研水平，扩大学术声誉。
第一届凝聚态物理会议将于2015年7月15日－17日在清华大学举行。
会议主题包括：拓扑量子态和多铁性、超导和多体物理、能源和低维物理、Quantum many-body theory and statistical physics、计算凝聚态物理、量子信息及其它与凝聚态物理的交叉领域等六个主题。
本次会议共设30个专题分会，将以大会特邀报告、分会特邀报告、口头报告和张贴海报等形式进行交流探讨。
组织委员会主办单位•清华大学物理系•中国科学院物理研究所•北京大学物理学院•量子物质科学协同创新中心顾问委员会：（按姓氏拼音序）崔田、杜瑞瑞、冯世平、龚新高、解士杰、李东海、李建新、林海青、李树深、陆卫、卢仲毅、吕力、沈保根、沈健、沈志勋、苏刚、王恩哥、王孝群、王玉鹏、向涛、薛其坤、张富春、张振宇组织委员会•清华大学物理系：陈曦、薛其坤•中科院物理研究所：胡江平、戴希、方忠、丁洪、周兴江、向涛•北京大学物理学院：谢心澄分会场负责人•拓扑量子态和多铁性：胡江平、陈曦、吕力、戴希、翁红明、寇谡鹏、吴从军•超导和多体物理：孙力玲、杨义峰、刘俊明、雒建林、袁辉球、李永庆、万歆、周毅•能源和低维物理：张振宇、李泓、陈弘、赵怀周、张远波•Quantum many-body theory and statistical physics：孟子扬、张广铭、郭文安、姚宏•计算凝聚态物理：姚裕贵、段文晖、龚新高、孟胜•量子信息及其它与凝聚态物理的交叉领域：范珩、田琳、翟荟、崔晓玲会议协调人•清华大学物理系：任俊（总协调人）•中国科学院物理研究所：齐建为、刘青梅•会务组：黄文艳、唐林、井小苏、周丹、骆洁、甘翠云、付德永、杨红、肖琳、胡文婷赞助单位•清华大学物理系•量子物质科学协同创新中心•中国科学院物理研究所•北京大学物理学院2015年第一届凝聚态物理会议分会场主题：A.拓扑量子态和多铁性A1拓扑半金属IA2拓扑半金属IIA3拓扑超导体和Majorana 费米子A4多铁性材料模拟与计算A5多铁性体系B.超导和多体物理B1铬基和锰基超导体B2极端条件下的超导行为B3铁基超导B4凝聚物质的激发态和动力学理论和实验B5重费米子物理C.能源和低维物理C1锂电池中的物理C2二维材料C3二维电子系统中的物理C4硅烯的最新进展C5热电中的新物理D.Quantum many-body theory and statistical physicsD1 Recent developments in strongly correlated quantum systems ID2 Recent developments in strongly correlated quantum systems IID3 Recent developments in strongly correlated quantum systems IIID4 Recent developments in strongly correlated quantum systems IVD5 Recent developments in strongly correlated quantum systems V注意事项：为了尊重外籍邀请报告人，如无特殊情况，D分会场报告请用英文。
Possible Signals of D^0-bar{D}^0 Mixing and CP Violation
a r X i v :h e p -p h /9703459v 1 31 M a r 1997DPNU-97-18March 1997Possible Signals of D 0-¯D0Mixing and CP Violation ∗Zhi-zhong Xing†Department of Physics,Nagoya University,Chikusa-ku,Nagoya 464-01,JapanAbstractIn view of the discovery potential associated with the future experiments of high-luminosity fixed target facilities,B -meson factories and τ-charm factories,we highlightsome typical signals of D 0-¯D0mixing and CP violation which are likely to show up in neutral D -meson decays to the semileptonic final states,the hadronic CP eigenstates,the hadronic non-CP eigenstates and the CP -forbidden states.Both time-dependent andtime-integrated measurements are discussed,and particular interest is paid to D 0/¯D0→K S,L +π0and D 0/¯D0→K ±π∓transitions.1IntroductionThe study of D 0-¯D0mixing and CP violation in neutral D -meson decays is not only comple-mentary to our knowledge obtained and to be obtained from K 0-¯K0and B 0-¯B 0systems,but also important for exploring underlying new physics that is out of reach of the standard model predictions.A large discovery potential associated with this topic is expected to exist in the future delicate experiments of high-luminosity fixed target facilities,B -meson factories,and τ-charm factories [1].WithoutCPTviolation,the mass eigenstates of D 0and ¯D0mesons can be written as |D L =p |D 0 +q |¯D0 ,|D H =p |D 0 −q |¯D0 ,(1.1)where p and q are complex parameters determined by off-diagonal elements of the D 0-¯D0mixing Hamiltonian.The rate of D 0-¯D0mixing is commonly measured by two well-defined dimensionless quantities,x D ≡∆m2Γ,(1.2)which correspond to the mass and width differences of D H and D L (i.e.,∆m ≡m H −m L and ∆Γ≡ΓL −ΓH ).The latest result from the Fermilab experiment E791has set an upper boundon the rate of D 0-¯D0mixing [2]:r D ≡x 2D +y 2D|p |4+|q |4.(1.4)It is expected that the magnitude of ∆D should be at most of the order 10−3in the standard model.However,a reliable estimation of ∆D suffers from large long-distance uncertainties.(b)CP violation in direct decay .For a decay mode D 0→f and its CP -conjugate process¯D0→¯f ,this implies | ¯f|H eff|¯D 0 |≡nA n e i(δn −φn )=| f |H eff|D 0 |≡nA n e i(δn +φn ),(1.5)where a parametrization of the decay amplitudes with the weak(φn)and strong(δn)phases is also given.We see that n≥2,φm−φn=0orπandδm−δn=0orπare necessary conditions for the above direct CP violation.(c)CP violation from the interplay of decay and mixing.Let us define two rephasing-invariant quantitiesλf≡qf|H eff|D0,¯λ¯f≡p¯f|H eff|¯D0,(1.6)where the hadronic states f and¯f are common to the decay of D0(or¯D0).Even in the assumption of|q/p|=1,indirect CP violation can appear ifImλf−Im¯λ¯f=0.(1.7) Provided f is a CP eigenstate(i.e.,|¯f =±|f )and the decay is dominated by a single weak phase,then we have¯λ¯f=λ∗f.CP violation at the percent level has not been observed in experiments[7].But signals of O(10−3)are expected in some neutral D decays within the standard model,and those of O(10−2)cannot be ruled out in some channels beyond the standard model.Subsequently we shall highlight some typical signals of D0-¯D0mixing and CP violation which are likely to show up in weak decays of neutral D mesons.A systematic and compre-hensive study of this topic can be found in Ref.[6]and references therein.2Typical signals of D0-¯D0mixingFor simplicity and instruction,we assume∆D=0in the discussion of D0-¯D0mixing effects. This assumption should be safe both within and beyond the standard model,and it can be tested by detecting CP violation in the semileptonic decays of D0and¯D0mesons.A.Time-integrated measurementsForfixed target experiments or e+e−collisions at theΥ(4S)resonance,the produced D0 and¯D0mesons are incoherent.Knowledge of D0-¯D0mixing is expected to come from ratios of the wrong-sign to right-sign events of semileptonic D decays:R(D0phys→K+l−¯νl)R(¯D0phys→K+l−¯νl)≈r D(2.1)in the assumption made above.The Fermilab experiment E791gives r D<0.5%at the90% confidence level[2],the best model-independent limit on D0-¯D0mixing today.For aτ-charm factory running on theψ(3.77)resonance,coherent D0¯D0events with odd C-parity can be produced.If e+e−collisions take place at theψ(4.16)resonance,coherent D0¯D0events will be produced throughψ(4.16)→γ(D0¯D0)C−even orψ(4.16)→π0(D0¯D0)C−odd. Three types of joint decay modes are interesting for measuring D0-¯D0mixing:(D0phys¯D0phys)C−→(l±X∓)D(l±X∓)¯D,−→(K±π∓)D(l∓X±)¯D,−→(K±π∓)D(K±π∓)¯D,(2.2) where we have used the notations X+≡K+¯νl and X−≡K−νl.Note that D0→K+π−is a doubly Cabibbo-suppressed decay(DCSD).This effect is usually measured by the following ratio of decay rates:R DCSD≡ K+π−|H eff|D0R DCSD[y D cos(δKπ−φD)−x D sin(δKπ−φD)],T−int=R(l±X∓;l±X∓)CR(K±π∓;l∓X±)CR(K±π∓;K±π∓)CR[D0(t)→K−π+]R[¯D0(t)→K−π+]R[D0(t)→K−π+]=R DCSD+T+int(Γt)+r DR[¯D0(t)→K+π−]=R DCSD+T−int(Γt)+r D¯K0π0|H eff|D02,(2.6)0.60.81.01.21.41.61.8012345ΓtR [¯D0(t )→K L π0]R [D 0(t )→K S π0]Figure 2:Illustrative plot for changes of two D 0-¯D0mixing observables with proper time t ,where (a)x D =y D =0.05,φD =π/4(corresponding to the solid curves)and (b)x D =0.05,y D =0,φD =π/2(corresponding to the dark solid curves)have been taken.analogous to R DCSD defined above.Obviously R ′DCSD and R DCSD are comparable in magnitude.To a good degree of accuracy,the time-dependent decay rates of D 0(t )→K S,L +π0and ¯D 0(t )→K S,L +π0are independent of R ′DCSD [6]:R [¯D0(t )→K S π0]2+2(y D cos φD +x D sin φD )(Γt )+y 2D (Γt )2,R [¯D0(t )→K L π0]2−2(y D cos φD +x D sin φD )(Γt )+y 2D (Γt )2,(2.7)where a tiny CKM phase from the direct transition amplitude has been neglected.One cansee that the deviation of each of the above two observables from unity measures nonvanishing x D sin φD ,while the difference between them measures the magnitude of y D cos φD −x D sin φD .Thus some useful information about x D ,y D and φD should be achievable from the experimental study of those decay modes.We typically take (a)φD =π/4,x D =y D =0.05and (b)φD =π/2,x D =0.05,y D =0,to plot changes of R [¯D0(t )→K S,L +π0]/R [D 0(t )→K S,L +π0]with proper time t in Fig.2for the purpose of illustration.Finally it is worth pointing out that a comparison of the interference terms in (2.7)with T ±int in (2.4)can provide a model-independent constraint on the strong phase shift δKπ.3Typical signals of CP violationIt is expected that CP violation induced by D 0-¯D0mixing (i.e.,∆D )can manifest itself,ap-parently or indirectly,in all neutral D -meson decay modes.But this effect should be negligiblysmall in most cases.A constraint on∆D is possible through measuring the semileptonic decays of either incoherent or coherent D0and¯D0mesons.For example,R(¯D0phys→K−l+νl)−R(D0phys→K+l−¯νl)R(K−l+νl;K−l+νl)C+R(K+l−¯νl;K+l−¯νl)C=∆D(3.2) for both C-odd and C-even cases.In the following we shall pay main attention to the direct and indirect CP asymmetries in some nonleptonic D transitions,where∆D=0will be assumed.A.Time-integrated measurementsFor neutral D mesons decaying to a hadronic CP eigenstate f,the observables of direct CP violation in the decay amplitude and indirect CP violation from the interplay of decay and D0-¯D0mixing are expressed asA dir≡1−|ρf|21+|ρf|2,(3.3)whereρf≡ f|H eff|¯D0 / f|H eff|D0 .In the time-integrated measurements,the following CP asymmetries can be used to probe A dir and A ind:(a)For incoherent decays of D0and¯D0mesons,we haveR(D0phys→f)−R(¯D0phys→f)R(l−X+;f)C+R(l+X−;f)C ≈ A dir(C−odd)A dir+2x D A ind(C−even).(3.5)Clearly it is possible to distinguish between direct and indirect CP-violating signals,if the magnitude of A dir is comparable with that of x D A ind.(c)At theψ(4.16)resonance there may be a type of CP violation arising from the CP-forbidden decay channels.For example,R(f;f)C−oddR(K Sπ0;K Lπ0)≈R(K Lπ0;K Lπ0)If r D were close to its experimental upper bound andφD were enhanced by new physics,this signal could be measured at aτ-charm factory‡.Now we turn our attention to CP violation in neutral D decays to non-CP eigenstates. Again D0/¯D0→K±π∓can be taken as a good example for illustration.It is expected that only indirect CP violation appears in these four decay modes.We denote the signals as follows:A Kπ≡ R DCSD sinφD(y D sinδKπ+x D cosδKπ),(3.8)whereφD andδKπhave been defined before.If|y D|≪|x D|,as anticipated in some non-standard models[4,10],we arrive at A′Kπ≈−A Kπ.For incoherent D-meson decays,A Kπcan be measured from the decay-rate asymmetryR(¯D0phys→K+π−)−R(D0phys→K−π+)R(l+X−;K+π−)C−R(l−X+;K−π+)CR(l−X+;K+π−)CR(l+X−;K+π−)C4A′KπR(K−π+;K+π−)C −R(K−π+;K−π+)C‡In contrast with(3.7),there may be a similar CP-violating signal for B d decays to K S X c and K L X c on theΥ(4S)resonance,where X c=J/ψ,ψ′,ηc,η′c,etc[11].This signal is expected to be of O(10%)due to the large B0d-¯B0d mixing rate(x B≈0.7)and significant CP-violating phase(φB∼19◦−70◦)in the standard model,thus it should be detectable at the forthcoming B-meson factories.-0.8%-0.6%-0.4%-0.2%0.0%0.2%12345ΓtD 0(t )vs ¯D0(t )→K S π0D 0(t )vs ¯D0(t )→K L π0R [D 0(t )→f ]+R [¯D0(t )→f ]≈A dir +x D A ind (Γt ),(3.10)where A dir and A ind have been defined before.Taking D 0/¯D0→K S,L +π0for example,we obtain R [D 0(t )→K S π0]−R [¯D0(t )→K S π0]R [D 0(t )→K L π0]+R [¯D0(t )→K L π0]≈−2Re ǫK −x D sin φD (Γt )(3.11)in the assumption of ∆D =0.Here Re ǫK ≈1.6×10−3,signifying the CP asymmetry inducedby K 0-¯K 0mixing,cannot be neglected [12].Even if the x Dsin φD term is vanishingly small,the effect of Re ǫK is still detectable from the above decay modes.For the purpose of illustration,we take x D =0.01and φD =0.1to plot changes of the CP asymmetries (3.11)with proper time t in Fig.3.Indirect CP violation in neutral D -meson decays to hadronic non-CP eigenstates can beillustrated by taking D 0/¯D0→K ±π∓for example.Assuming ∆D =0,we have R [¯D0(t )→K +π−]−R [D 0(t )→K −π+]-0.10.10.30.50.7012345ΓtD 0(t )→K +π−vs¯D0(t )→K −π+¯D0(t )→K +π−vsD 0(t )→K −π+R [D 0(t )→K +π−]+R [¯D0(t )→K −π+]≈A ′Kπ2(Γt )+r DI would like to thank S.Pakvasa for inviting me to participate in this nice conference.I am grateful to A.I.Sanda for his encouragement and support,which make my participation realizable.This work was supported by the Japan Society for the Promotion of Science.References[1]See,e.g.,Proceedings of the Workshop on the Future of High Sensitivity Charm Experi-ments,Batavia,Illinois,1994,edited by D.M.Kaplan and S.Kwan(Fermilab Report No.94/190,Batavia,1994);Proceedings of the Workshop on the Tau-Charm Factory in the Era of B-Factory and CESR,Stanford,California,1994,edited by L.V.Beers and M.L.Perl(SLAC Report No.451,Stanford,1994);T.Liu,Ph.D.Thesis,Harvard University,Report No.HUHEPL-20(1995).[2]E791Collaboration,E.M.Aitala et al.,Phys.Rev.Lett.77(1996)2384;M.Purohit,in these proceedings.[3]E.Golowich,Report No.hep-ph/9701225(invited talk given at the4th KEK TopicalConference on Flavor Physics,29-31October,1996),to be published in Nucl.Phys.B (Proc.Suppl.).[4]E.Golowich,in these proceedings.[5]I.I.Bigi and A.I.Sanda,Phys.Lett.B171(1986)320;I.I.Bigi,in Proceedings of the Tau-Charm Factory Workshop,Standford,California,1989,edited by L.V.Beers(SLAC Report No.343,Stanford,1989),p.169.[6]Z.Z.Xing,Phys.Rev.D55(1997)196.[7]CLEO Collaboration,J.Bartelt et al.,Phys.Rev.D52(1995)4860;E687Collaboration,P.L.Frabetti et al.,Phys.Rev.D50(1994)R2953.[8]CLEO Collaboration,D.Cinabro et al.,Phys.Rev.Lett.72(1994)406;E791Collaboration,E.M.Aitala et al.,Report No.hep-ph/9608018(1996).[9]Z.Z.Xing,Phys.Lett.B372(1996)317.[10]T.E.Browder and S.Pakvasa,Phys.Lett.B383(1996)475;L.Wolfenstein,Phys.Rev.Lett.75(1995)2460;G.Blaylock,A.Seiden,and Y.Nir,Phys.Lett.B355(1995)555.[11]Z.Z.Xing,Report No.DPNU-97-16(invited talk given at the1997Shizuoka Workshopon Masses and Mixings of Quarks and Leptons,Shizuoka,March19-21,1997),to be published in the workshop proceedings;Z.Z.Xing,Phys.Rev.D53(1996)204.[12]Z.Z.Xing,Phys.Lett.B353(1995)313.。
小学上册第十四次英语第四单元真题
小学上册英语第四单元真题英语试题一、综合题(本题有100小题，每小题1分，共100分.每小题不选、错误，均不给分)1.The ice cream is melting ________ (在阳光下).2.The _______ (小狮子) plays with its siblings in the grass.3.I use my ________ (玩具名称) to solve puzzles.4.What do you call a collection of songs?A. AlbumB. PlaylistC. CompilationD. MixtapeA5.What is the name of the famous wizarding school in Harry Potter?A. HogwartsB. BeauxbatonsC. DurmstrangD. IlvermornyA6.Where do penguins live?A. DesertB. ForestC. ArcticD. AntarcticD7. A rabbit has long _______ to listen carefully.8.I need to _______ (finish) my homework.9.The first successful combined organ transplant was performed in ________.10. A mixture of two or more liquids is called an ______.11.The process of a solid turning into a liquid is called _______.12.The chemical symbol for iodine is _______.13.What is the name of the famous bridge in San Francisco?A. Brooklyn BridgeB. Golden Gate BridgeC. Hoover DamD. London BridgeB14.I like to ___ (color) in my coloring book.15.The capital of Russia is _____.16.What instrument do you blow into to play?A. FluteB. GuitarC. PianoD. DrumA17.The boiling point of ethanol is ______ degrees Celsius.18.The _______ (猴子) is very intelligent and playful.19.The __________ (历史的平衡) requires multiple viewpoints.20.在中国，古代的________ (ceremonies) 反映了人们的信仰与文化。
英文版原子物理课件
1.1 Introduction
The origins of atomic physics :quantum mechanics Bohr model of the H This introductory chapter surveys some of the early ideas: Spectrum of atomic H and Bohr Theory Einstein's treatment of interaction of atom with light the Zeeman effect Rutherford scattering And so on
Shanxi University Atomic Physics
1.2 Spectrum of atomic hydrogen_3
Wavenumbers may seem rather old-fashioned but they are very useful in atomic physics
the characteristic spectrum for atoms is composed of discrete lines that are the ‘fingerprint' of the element.
In 1888, the Swedish professor J. Rydberg found that the spectral lines in hydrogen obey the following mathematical formula:
Shanxi University Atomic Physics
Lyman series: n’ = 2; 3; 4; … n = 1. Balmer (n = 2), Paschen series: (n = 3), Brackett (n = 4) and Pfund (n = 5)
优选大学英语全新版第三册第四单元答案演示ppt
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厦门“PEP”2024年小学四年级第8次英语第二单元测验试卷
厦门“PEP”2024年小学四年级英语第二单元测验试卷考试时间：100分钟（总分:120）B卷考试人：_________题号一二三四五总分得分一、综合题(共计100题)1、听力题：The symbol for germanium is _____.2、填空题：I like to practice ______ every day.3、填空题：A _______ (兔子) can be a fluffy companion.4、听力题：The process of ionization produces charged ______.5、填空题：The country known for the Eiffel Tower is ________ (法国).6、What is a common pet that barks?A. CatB. DogC. HamsterD. Fish答案: B7、填空题：The author writes _____ (小说) about adventure.8、选择题：What do we call the process of making bread rise?A. KneadingB. ProofingC. BakingD. Mixing9、What do we call the study of living things?A. ChemistryB. BiologyC. PhysicsD. Geography10、听力题：The _____ (铅笔) is sharp.11、填空题：We have a ______ (特别的) event this weekend.12、填空题：Later, we sit under a tree to rest. We talk about our favorite ______ (5) and share funny stories. I love spending time with my friends because they always make me laugh.13、填空题：I enjoy ________ (绘画) in my free time.14、填空题：The manatee is a gentle ________________ (巨型动物).15、填空题：The __________ (历史的深入研究) reveals complexities.16、听力题：A reaction that produces a precipitate indicates a ______ change.17、填空题：The _______ (狗) wags its tail when happy.18、What do you call a young giraffe?A. CalfB. FoalC. PupD. Kit19、What do we call the first ten numbers in counting?A. Single digitsB. Double digitsC. Whole numbersD. Integers20、What is a synonym for "happy"?A. SadB. JoyfulC. AngryD. Tired21、What is the name of the famous American singer known for "Chasing Cars"?A. Ed SheeranB. Snow PatrolC. John LegendD. Sam Smith答案：B22、What is the capital of Malaysia?A. Kuala LumpurB. SingaporeC. BangkokD. Jakarta答案: A23、What is the national flower of Japan?A. RoseB. Cherry BlossomC. TulipD. Orchid答案:B24、听力题：A reaction that absorbs energy is known as an ______ reaction.25、What do we call the process of removing trees from a forest?A. AfforestationB. ReforestationC. DeforestationD. Preservation答案:C26、填空题：The __________ is the longest mountain range in the world. (安第斯山脉)27、选择题：What color are blueberries?A. RedB. BlueC. YellowD. Green28、填空题：The country known for its folklore is ________ (爱尔兰).29、听力题：A solution that does not conduct electricity is called a ______ solution.30、What do you call a piece of furniture for sleeping?A. ChairB. TableC. BedD. Couch答案:C31、听力题：Metals are usually __________ at room temperature.32、听力题：A sheep goes "______."33、填空题：A frog can leap from one place to another very ______ (远).34、听力题：The rain is ___. (falling)35、填空题：A ______ (城市花园) can beautify neighborhoods.36、填空题：The ancient Egyptians wrote on ______ (草纸).37、听力题：My mom is a ______. She enjoys baking cakes.38、填空题：My favorite toy is a __________ (玩具名) because it is very __________ (形容词).39、听力题：The chemical formula for magnesium chloride is ______.40、选择题：What do you call the study of living things?A. BiologyB. ChemistryC. PhysicsD. Geography41、What do we call the sport played on ice with skates?A. SoccerB. BasketballC. Ice HockeyD. Football答案:C42、What is the name of the famous bridge in San Francisco?A. Golden Gate BridgeB. Brooklyn BridgeC. Tower BridgeD. Sydney Harbour Bridge43、填空题：The first person to perform a successful brain transplant was _______. (理查德·巴尔)44、听力题：The process of changing a gas into a liquid is called ______.45、Where does the sun set?A. EastB. WestC. NorthD. South答案:B46、听力题：She is ___ a video. (watching)47、听力题：The cat naps in the ____.48、听力题：I want to ________ (improve) my skills.49、How many colors are there in a rainbow?A. 5B. 6C. 7D. 850、What is the name of the famous musician known for his "Thriller" album?A. Michael JacksonB. Elvis PresleyC. MadonnaD. Prince答案: A51、选择题：What is the name of the famous battle fought in 1066?A. Battle of HastingsB. Battle of WaterlooC. Battle of GettysburgD. Battle of Agincourt52、听力填空题：I like reading books about __________ because they are __________.53、What do we call the person who helps us learn?A. TeacherB. StudentC. ParentD. Friend54、填空题：The ______ (小鸭子) loves to swim.55、听力题：The ______ enjoys writing scripts for movies.56、填空题：A ____(community visioning) process develops future goals.57、听力题：I want to ___ a story. (tell)58、What do you call the art of creating images with a camera?A. PhotographyB. PaintingC. DrawingD. Sculpture答案: A59、填空题：I can ______ (独立思考) and analyze situations.60、填空题：My sister is __________ (迷人的).61、What do we call a large group of people gathered for a common purpose?A. CrowdB. AudienceC. GatheringD. Assembly答案：A62、填空题：The ________ (玩具) makes a funny sound when you press it.63、What do you call a person who fixes cars?A. DoctorB. EngineerC. MechanicD. Teacher答案:C64、听力题：I like to ________ with my family.65、听力题：The chemical formula for nitric acid is ________.66、填空题：The tortoise can live for many _________ (年).67、听力题：She is _____ (teaching) a lesson.68、听力题：The capital of the United Kingdom is __________.69、What is the name of the famous mountain in South America?A. KilimanjaroB. AndesC. RockiesD. Himalayas答案:B70、听力题：A __________ is a reaction that produces new substances.71、听力题：I see a __ in the park. (dog)72、How many hearts does an octopus have?A. 1B. 2C. 3答案:C73、填空题：My sister is a great __________ (歌手).74、填空题：The monkey loves to swing from _________. (树枝)75、 (Reformation) led to the creation of Protestant churches. 填空题：The ____76、听力题：I drink _____ milk in the morning. (cold)77、填空题：I can express my thoughts with my ________ (玩具名称).78、What do we call the study of space?A. GeologyB. AstronomyC. BiologyD. Physics答案: B79、ts are _____ (有毒) and should not be touched. 填空题：Some pla80、填空题：The kitten purrs when it is _________. (满足)81、What is the capital city of Norway?A. OsloB. BergenC. StavangerD. Trondheim82、What color do you get when you mix red and white?A. PinkB. PurpleC. BrownD. Gray83、选择题：What is 5 - 3?A. 1C. 3D. 484、填空题：The ferret is very ______ (好奇) and playful.85、填空题：Many plants play an important role in ______ (生态平衡).86、What is the main fruit used to make cider?A. OrangeB. GrapeC. AppleD. Cherry答案:C87、听力题：The term “sublimation” refers to a solid changing directly to a _____.88、听力题：The symbol for palladium is _____.89、 Rights Movement aimed to end ________ (种族歧视). 填空题：The Civi90、How many continents are in the world?A. SixB. SevenC. EightD. Nine答案: B91、permaculture) design mimics natural ecosystems. 填空题：The ____92、填空题：I enjoy playing with my ______.93、What is the capital of Ecuador?A. QuitoB. GuayaquilC. CuencaD. Loja答案: A94、What is the longest river in the world?A. AmazonB. NileC. MississippiD. Yangtze答案:B95、听力题：The chemical symbol for bromine is ______.96、听力题：Asteroids can cause significant damage to Earth if they _______.97、听力题：The chemical symbol for oxygen is ______.98、听力题：The __________ is a large area of grassy plains.99、填空题：The park is _______ (很美丽)。
浙江省Lambda联盟2023-2024学年高三下学期第一次联考物理试题含解析
Lambda 联盟2024学年第二学期第一次联考物理（答案在最后）本试题卷分选择题和非选择题两部分，共8页，满分100分，考试时间90分钟。
考生注意：1．答题前，请务必将自己的姓名、准考证号用黑色字迹的签字笔或钢笔分别填写在试题卷和答题纸规定的位置上。
2．答题时，请按照答题纸上“注意事项”的要求，在答题纸相应的位置上规范作答，在本试题卷上的作答一律无效。
3．非选择题的答案必须使用黑色字迹的签字笔或钢笔写在答题纸上相应区域内，作图时可先使用2B 铅笔，确定后必须使用黑色字迹的签字笔或钢笔描黑。
4．可能用到的相关参数：重力加速度g 取210m /s 。
选择题部分一、选择题I （本题共13小题，每小题3分，每小题列出的四个备选项中只有一个是符合题目要求的，不选，多选，错选均不得分）1.雷诺数Re 是流体力学中表征流体的特征的数之一，它是一个无量纲量，已知雷诺数由四个变量决定，流体的流速v 、流体的密度ρ、特征长度d ，黏性系数μ。
已知黏性系数μ的单位是Pa·s ，则下列雷诺数的表达式可能正确的是（）A.Re μ=B.Re vdρμ=C.2Re vd ρμ=D.3Re vd ρμ=【答案】B 【解析】【详解】流体的流速v 单位为m/s ，流体的密度ρ单位为kg/m 3、特征长度d 单位为m ，黏性系数μ的单位为Pa·s ，而Re 是一个无量纲量，所以3sPa s kg/m m/s m kg/m skg/m ⋅⋅⋅=⋅⋅即Re vdρμ=故选B 。
2.“晨阳”杯篮球赛中，奔跑中的小硕想传球给站在侧面无人防守的小轩，已知二人的位置与小硕的速度v 方向如图所示，不计空气阻力，则小硕要将球传给小轩（）A.应该让球沿着1的方向抛出B.应该让球沿着2的方向抛出C.应该让球沿着3的方向抛出D.应该让球沿着4的方向抛出【答案】A 【解析】【详解】小硕奔跑的速度v ，球抛出后由于惯性也具有水平向右的速度v ，想让静止的小轩接住，球的合速度必须指向2，应该让球沿着1的方向抛出，故A 正确。
小学上册第十三次英语第2单元真题试卷(有答案)
小学上册英语第2单元真题试卷(有答案)英语试题一、综合题(本题有100小题，每小题1分，共100分.每小题不选、错误，均不给分)1.What do we call the process of taking care of someone?A. NurturingB. NeglectingC. AbandoningD. Ignoring答案:A. Nurturing2.Static electricity is the result of an imbalance of ______.3.My brother enjoys _______ (运动)。
4.The __________ was a major turning point in World War II. (诺曼底登陆)5.Fossils are often found in __________ rocks.6.I _____ (play/learn) the guitar.7. A solid has a definite shape and ______.8.I like to eat __________ for lunch.9.My uncle is a __________ (建筑师).10.She has a nice ________.11.My brother plays the ____ (cello) in the orchestra.12.My ________ (玩具名称) helps me learn new words.13.The Earth's tilt affects the changing of the ______.14.小马) neighs softly. The ___15.What is the term for the speed of light?A. 300,000 kilometers per secondB. 150,000 kilometers per secondC. 100,000 kilometers per secondD. 1,000 kilometers per second答案: A16.My uncle is a _____ (律师) who defends clients.17.The capybara is the largest ______ (啮齿动物).18.I can have endless fun with my ________ (玩具类型).19.I can ___ my homework before dinner. (finish)20.What do we call a story that is based on real events?A. FictionB. Non-fictionC. BiographyD. Novel答案:B21.__________ (化学科技) advances industries by improving production methods.22.The _____ (sky/ground) is clear.23.I like to _____ (参加) events.24. A butterfly is a symbol of ________________ (变革).25.When I have friends over, we create a ________ (名词) together with our toys.26.The amount of space an object occupies is called its __________.27.I like to play with my _________ (电动玩具) on rainy days.28.I have a _____ (手套) that keeps my hands warm in winter. 我有一双冬天保暖的手套。
贵阳2024年07版小学五年级上册第2次英语第四单元全练全测(含答案)
贵阳2024年07版小学五年级上册英语第四单元全练全测(含答案)考试时间：100分钟（总分:140）B卷考试人：_________题号一二三四五总分得分一、综合题(共计100题共100分)1. 选择题：What do you call a person who studies the environment?A. EcologistB. BiologistC. GeologistD. All of the above答案: D2. 听力题：The ______ teaches us about environmental science.3. 填空题：We should _______ (鼓励) each other.4. 选择题：What do we call a large body of freshwater?A. LakeB. OceanC. RiverD. Stream答案:A5. 填空题：My uncle is a skilled __________ (木匠).6. 听力题：The ______ loves to play chess.7. 选择题：What do we celebrate on the 4th of July in the USA?A. ThanksgivingB. Independence DayC. ChristmasD. Halloween8. 听力题：She rides the _______ (bus) to work.9. 听力题：They are ______ a game of chess. (playing)10. 选择题：What do we call a young chicken?A. DucklingB. CalfC. ChickD. Foal11. 听力题：The cat loves to chase its own _____ tail.12. 填空题：The __________ is the habitat for polar bears. (北极)13. 选择题：What do you call the study of living things?a. Biologyb. Chemistryc. Physicsd. Astronomy答案:a14. 选择题：What is the name of the famous ancient site in Greece?A. Great WallB. ColosseumC. ParthenonD. Stonehenge答案: C15. 填空题：The ________ (交通) in big cities can be very busy.16. 选择题：Which animal can live both in water and on land?A. FishB. FrogC. BirdD. Lizard17. 听力题：We are going to _____ (theater/zoo) this weekend.18. 选择题：What color do you get by mixing red and white?A. PinkB. PurpleC. OrangeD. Brown答案:A19. 填空题：I want to _______ (了解) different countries.20. 填空题：We can _______ (一起玩) games.21. 听力题：I love to ___ (cook/eat) with friends.22. 听力题：The _____ (butterfly/bird) is colorful.23. 选择题：What do you call a baby cat?A. PuppyB. KittenC. CalfD. Chick答案:B24. 选择题：What do we call the process of moving from one place to another?A. MigrationB. JourneyC. TravelD. Voyage答案: A. Migration25. 听力题：I play with my _____ (朋友) at the playground.In ancient Rome, the __________ was a large arena for gladiator fights. (斗兽场)27. 听力题：We make ______ (cookies) for the party.28. 听力题：The study of living things is called __________.29. 听力题：Some _______ can only grow in specific climates.30. 选择题：Which of these is a vegetable?A. BananaB. PotatoC. OrangeD. Apple答案:B31. 选择题：What is the main language spoken in the USA?A. SpanishB. FrenchC. GermanD. English答案: D. English32. 选择题：What is the main ingredient in a bagel?A. BreadB. DoughC. WaterD. Flour答案:D33. 听力题：A _______ is a type of mixture that does not settle out over time.34. des were a series of religious ________ (战争). 填空题：The Dead35. 听力题：I have _____ (two/three) brothers.The chemical symbol for calcium is _____ (Ca).37. 填空题：The crow is a very ______ (聪明的) bird.38. 填空题：The ancient Romans used ________ (法律) to maintain order.39. 选择题：What is the main ingredient in sushi?A. FishB. RiceC. SeaweedD. All of the above答案:D40. 选择题：How many sides does a rectangle have?A. ThreeB. FourC. FiveD. Six答案: B41. 选择题：Which color is a ripe strawberry?A. BlueB. GreenC. RedD. Yellow答案: C. Red42. 选择题：What do you call the largest planet in our solar system?A. EarthB. MarsC. JupiterD. Neptune答案:C43. 选择题：What do we call a person who studies ancient texts?A. PhilologistB. LinguistC. HistorianD. Archeologist答案: A44. 填空题：The bison's bulk helps it endure harsh ______ (天气).45. 听力题：Astrophysics combines principles of physics and ______ to understand the universe.46. 听力题：A chemical change involves the rearrangement of ______.47. 选择题：What do we call the time when the sun rises?A. SunsetB. MidnightC. DawnD. Noon答案: C. Dawn48. 选择题：What is the opposite of noisy?A. QuietB. LoudC. SoftD. Calm答案:A49. 填空题：The ancient Greeks held _____ to commemorate their gods.50. 选择题：What is the name of the liquid that circulates in our bodies?A. BloodB. WaterC. AirD. Plasma51. 听力题：My ______ is a great cook.52. 填空题：The _______ (Pharaoh) was considered a god in ancient Egypt.53. 填空题：The dog chases its _______ (狗追着它的_______).54. 听力题：The elephant is very ___. (big)55. 听力题：The sun is _______ (shining) through the trees.56. 填空题：My _____ (小狗) loves to fetch sticks.57. 听力题：A chemical change is usually difficult to _______.58. 填空题：We created an obstacle course with ________ (玩具车) in the backyard. It was a fun ________ (挑战).59. 选择题：What do we call a scientist who studies rocks?A. BiologistB. GeologistC. ChemistD. Physicist答案:B60. 听力题：The _____ (tiger) is fierce.61. 填空题：The dog likes to ________ (追逐) balls.62. 选择题：What is the name of the fairy tale character who had a magical wardrobe?A. CinderellaB. AliceC. Peter PanD. Narnia63. 填空题：The __________ is a famous mountain range in Europe. (阿尔卑斯山脉)64. 选择题：What is the main source of energy for the Earth?A. WindB. WaterC. SunD. Coal答案:C65. 选择题：What is the weather like when it rains?A. DryB. WetC. SunnyD. Cold答案:B66. 填空题：My brother is a __________ (游戏设计师).67. 选择题：What is the name of the bright star in the night sky?A. MoonB. SunC. SiriusD. North Star68. 听力题：The chemical formula for calcium carbonate is ______.69. 填空题：The ______ (小鹰) soars high in the ______ (天空), searching for its prey.70. 听力题：The __________ can lead to the creation of new habitats.71. 选择题：What is the capital of Bangladesh?A. DhakaB. ChittagongC. KhulnaD. Rajshahi72. 选择题：What do you call a person who plays the piano?A. PianistB. MusicianC. ComposerD. Artist答案: AThe process of crystallization purifies ______.74. 选择题：What do we call the liquid part of blood?A. PlasmaB. PlateletsC. Red blood cellsD. White blood cells答案:A75. 选择题：What is the name of the planet we live on?A. MarsB. VenusC. EarthD. Jupiter76. 填空题：In ancient China, the __________ Dynasty was known for its inventions. (汉朝)77. 填空题：I enjoy _______ (喝果汁) in the summer.78. 选择题：What is the term for the movement of the Earth around the sun?A. RotationB. RevolutionC. OrbitD. Spin答案: B79. 填空题：My brother loves to play __________ (视频游戏).80. 填空题：I can stack my ________ (玩具类型) high.81. 填空题：My friend loves to read __________ (漫画).82. 听力题：The cat loves to chase its _____ shadow.The __________ is a well-known geological site.84. 选择题：How many days are there in a week?A. FiveB. SixC. SevenD. Eight答案: C. Seven85. 听力题：The _____ is where most comets come from.86. 听力题：A ______ is a type of mammal that lays eggs.87. 选择题：Which food is made from milk and comes in many flavors?A. YogurtB. CheeseC. Ice creamD. Butter88. 填空题：I think it’s important to stay ________ (积极) and focus on the good things in life.89. 选择题：What is the main ingredient in a Caesar salad?A. SpinachB. Romaine lettuceC. KaleD. Arugula答案: B90. (94) is an important body of water in Asia. 填空题：The ____91. 听力题：I can ______ (jump) high in gym class.92. 选择题：What is a lunar eclipse?A. When the sun covers the moonB. When the earth covers the moonC. When the moon covers the earthD. When stars align93. 选择题：How many days are in February during a leap year?a. 28b. 29c. 30d. 31答案:B94. 选择题：What is 15 + 6?A. 20B. 21C. 22D. 2395. 填空题：My sister plays the _____ (钢琴) beautifully.96. 听力题：Chemical changes can result in the release of ________.97. 听力题：The _______ of a sound can be influenced by the environment.98. 听力题：The _____ (气球) float in the air.99. 选择题：What is the action of jumping on a trampoline called?A. BouncingB. LeapingC. SkippingD. Flying答案:A100. 听力题：We enjoy visiting the ___. (farm)。
基本物理常数表
PrefaceFundamental Physical Constants: 1998Peter J. Mohr and Barry N. TaylorNational Institute of standards and Technology, Gaithersburg, MD 20899-8401This table gives the 1998 self-consistent set of values of the basic constants and conversion factors of physics and chemistry recommended by the Committee on Data for Science and Technology (CODATA) for international use. Further, it describes in detail the adjustment of the values of the subset of constants on which the complete 1998 set of recommended values is based. The 1998 set replaces its immediate predecessor recommended by CODATA in 1986. The new adjustment, which takes into account all of the data available through 31 December 1998, is a significant advance over its 1986 counterpart. The 1998 adjustment was carried out by P. J. Mohr and B. N. Taylor of the National Institute of Standards and Technology (NIST) under the auspices of the CODATA Task Group on Fundamental Constants. The standard uncertainties (i.e., estimated standard deviations) of the new recommended values are in most cases about 1/5 to 1/12 and in some cases 1/160 times the standard uncertainties of the corresponding 1986 values. Moreover, in almost all cases the absolute values of the differences between the 1998 values and the corresponding 1986 values are less than twice the standard uncertainties of the 1986 values.The Task Group was established in 1969 with the aim of periodically providing the scientific and technological communities with a self-consistent set of internationally recommended values of the fundamental physical constants based on all applicable information available at a given point in time. The first set was published in 1973 and was followed by a revised set first published in 1986; the current 1998 set first appeared in 1999. In the future, the CODATA Task Group plans to take advantage of the high level of automation developed for the current set in order to issue a new set of recommended values at least every four years.Relative std. Quantity Symbol Value Unit uncert.u ra Value recommended by the Particle Data Group,Caso et al.,Eur.Phys.J.C3(1-4),1-794(1998).b Based on the ratio of the masses of the W and Z bosons mW/m Z recommended by the Particle Data Group(Caso et al.,1998).The value for sin2θW they recommend,which is based on a particular variant of the modified minimal subtraction(。