检索结果-南通市图书馆

A Generalized Yang-Mills Model and Dynamical Breaking of Gauge Symmetry

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2005年第6期43卷 1083-1086页

作者： WANGDian-Fu songhe-shan DepartmentofPhysics DalianUniversityofTechnologyDalian116024China

A generalized Yang-Mills model, which contains, besides the vector part Vμ, also a scalar part S, is constructed and the dynamical breaking of gauge symmetry in the model is also discussed. It is shown, in terms of Nambu-Jona-Lasinio (NJL) mechanism, that the gauge symmetry breaking can be realized dynamically in the generalized Yang-Mills model. The combination of the generalized Yang-Mills model and the NJL mechanism provides a way to overcome the difficulties related to the Higgs field and the Higgs mechanism in the usual spontaneous symmetry breaking theory.

关键词： Yang-Mills theory dynamical symmetry breaking

Dynamical Model of QCD Vacuum and Color Thaw at Finite Temperatures

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2004年第3X期42卷 385-388页

作者： WANGDian-Fu songhe-shan MIDong DepartmentofPhysics DalianUniversityofTechnologyDalian116024China

In terms of the Nambu-Jona-Lasinio (NJL) mechanism, the dynamical symmetry breaking of a simple localgauge model is investigated. An important relation between the vacuum expectation value of gauge fields and scalarfields is derived by solving the Euler equation for the gauge fields. Based on this relation the SU(3) gauge potential isgiven which can be used to explain the asymptotic freedom and confinement of quarks in a hadron. The confinementbehavior at finite temperatures is also investigated and it is shown that color confinement at zero temperature can bemelted away under high temperatures.

关键词： QCD腔动力学模型有限温度色融化 Nambu-Jona-Lasinio器件欧拉方程

Dynamically Broken Supergauge Symmetries

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2003年第5X期40卷 543-546页

作者： WANGDian-Fu songhe-shan ANYing DepartmentofPhysics DalianUniversityofTechnologyDalian116024China InstituteofTheoreticalPhysics AcademiaSinicaP.O.Box2735Beijing100080China

The dynamical breaking of the supergauge symmetries in the massless supergauge Wess-Zumino model is discussed without adding the Fayet-Iliopoulos term to the Lagrangian. It is shown, in terms of the Nambu-Jona-Lasinio mechanism, that the supersymmetry breaking and the gauge symmetry breaking can be realized dynamically. It is also shown that the dynamical breaking moves the vacuum expectation values of two scalar fields away from zero. In order to restore the symmetry of the vacuum, one of the two scalar fields is translated and at the same time the mass spectrum is changed too.

关键词：超对称结构 Wess-Zumino模型动态破坏费米质量理论物理论

Dynamical Model of QCD Vacuum and Quark Confinement

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

Communications in Theoretical Physics 2004年第5期41卷 729-732页

作者： WANGDian-Fu songhe-shan MIDong DepartmentofPhysics DalianUniversityofTechnologyDalian116024China

The phase transition of a simple local gauge model is investigated in terms of the Nambu–Jona-Lasinio mechanism and it is pointed out that the physical vacuum of QCD is bound state of quark-antiquark pairs which can be viewed, generally, as a nearly perfect color dia-electric medium. An important relation between the vacuum expectation value of gauge fields and scalar fields is also derived by solving the Euler equation for the gauge fields. Based on this relation the gauge potential is given which can be used to explain the asymptotic behavior and confinement of quarks in a hadron, and at the same time the Yukawa potential of strong interaction can be given too.

关键词： QCD vacuum quark confinement

Coherence Loss of Two-Photon Jaynes-Cummings Model in Dispersive Approximation

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2004年第1期41卷 111-114页

作者： ZHOULing GUOYan-Qing songhe-shan LIChong DepartmentofPhysics DalianUniversityofTechnologyDalian116023China

Completely solving the dissipative dynamics of nonlinear Jaynes-Cumming model is a very difficult *** our recent work (Phys. Lett. A284 (2001) 156), we just obtained analytical results of the field dissipative dynamicsof the nonlinear JCM. In the present paper, employing the perturbative expansion of master equation, we obtain thedensity operator of the system (field +atom). The coherence losses of the system and of the atom are investigated whentwo-photon process is involved. We also study the effect of different atomic initial states and the influence of the fieldamplitude on the atomic coherence loss.

关键词： dissipative dynamics two-photon Jaynes-Cummings model master equation coherence loss linear entropy

Engineering Two-Atom Thermal Entanglement via Two-Photon Process

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2004年第4X期42卷 524-528页

作者： GUOYan-Qing ZHOULing songhe-shan YIXue-Xi DepartmentofPhysics DalianUniversityofTechnologyDalian116023China

We study that two atoms simultaneously interact with a single mode thermal field via different couplings and different spontaneous emission rates when two-photon process is involved. It is found that we indeed can employ the different couplings to produce the two-atom thermal entanglement in two-photon process. The different atomic spontaneous emission rates are also utilizable in generating thermal entanglement. We also investigate the effect of the can obtain a strong and steady entanglement.

关键词：双原子热纠缠双光子加工自发辐射量子信息谐振腔量子电动力学

中小学教师远程培训中有引领的自主学习模式探索——MOOCs的借鉴与本土实践

在线全文

学校读者我要写书评

暂无评论

天津电大学报 2014年第4期18卷 23-29页

作者：何山袁松鹤全国中小学教师继续教育网北京1000142 国家开放大学校长办公室北京100039

提高培训质量是中小学教师远程培训面临的重难点。分析国外3个网站中的3门MOOCs课程,借鉴MOOCs在预设引领的自主学习模式的理念与做法,探索A企业"国培计划"教学模式中线性学习路径、针对性专家答疑、综合实践活动、学习评价和辅导教师... 详细信息

提高培训质量是中小学教师远程培训面临的重难点。分析国外3个网站中的3门MOOCs课程,借鉴MOOCs在预设引领的自主学习模式的理念与做法,探索A企业"国培计划"教学模式中线性学习路径、针对性专家答疑、综合实践活动、学习评价和辅导教师过程引领的改进与完善,增强了课程内容的交互性、实用性,提高了培训工作的有效性和学习者的学习积极性,也提升了A企业在教育部"国培计划"满意度调研中的排名。

关键词：国培计划中小学教师远程培训 MOOCs 教学模式

同波束VLBI测量下的天问一号火星车定位及精度分析

在线全文

学校读者我要写书评

暂无评论

武汉大学学报（信息科学版） 2023年第1期48卷 84-91页

作者：杨鹏黄勇李培佳刘庆会秦松鹤单荃刘思语中国科学院上海天文台上海200030 中国科学院大学天文与空间科学学院北京100049

针对中国天问一号火星探测任务中的火星车定位问题,进行了相关方法的研究和精度分析。根据现有测控条件,考虑到火星车无地面测距数据,提出了利用轨道器和火星车的同波束甚长基线干涉测量(same-beam very long baseline interferometry,S... 详细信息

针对中国天问一号火星探测任务中的火星车定位问题,进行了相关方法的研究和精度分析。根据现有测控条件,考虑到火星车无地面测距数据,提出了利用轨道器和火星车的同波束甚长基线干涉测量(same-beam very long baseline interferometry,SBI)数据对火星车进行定位的方法。由于利用SBI联合轨道器测距数据无法在定轨定位的同时解算差分相时延模糊度,分析了在固定轨道器的轨道情况下,仅利用SBI数据进行火星车定位。结果表明,火星车定位误差随着轨道器的轨道精度提高而减小,如果轨道器的轨道精度从1 km提升到100 m或10 m,6 h SBI数据可以将火星车定位精度提高到数百米,同时,增加数据弧段可进一步提高定位精度,当对着陆器高程方向进行约束时,定位精度会有明显改善。

关键词：火星探测天问一号同波束甚长基线干涉测量轨道器火星车定位

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

脉塞通对人血小板膜微粘度的影响

上海医科大学学报 1987年第4期14卷 306-309页

作者：陈松鹤余竹元张国祯上海医科大学中山医院血液科上海医科大学中山医院肝癌研究室

以DPH为荧光探剂,测定人血小板膜偏振度,研究三七的有效成分脉塞通对血小扳膜微粘度的影响。在本实验条件下,血小板膜微粘度随脉塞通浓度的增加和孵育时间的延长而减小。脉塞通能消除低密度脂蛋白增高血小板膜微粘度的作用。脉塞通对血... 详细信息

以DPH为荧光探剂,测定人血小板膜偏振度,研究三七的有效成分脉塞通对血小扳膜微粘度的影响。在本实验条件下,血小板膜微粘度随脉塞通浓度的增加和孵育时间的延长而减小。脉塞通能消除低密度脂蛋白增高血小板膜微粘度的作用。脉塞通对血小板膜微粘度的作用大于对红细胞膜微粘度的作用。

关键词：脉塞通三七血小板膜粘度