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解决带电粒子在圆磁场中运动的基本方法
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作者 刘梦怡 《东西南北(教育)》 2017年第19期96-96,共1页
携电粒子在有限磁场中的运动问题是历年高考试卷中所要考查的经典内容,而相关于圆形有限磁场的知识内容又是其热点中的焦点部分。在我们高中阶段的物理科目学习内容中,含电粒子在圆形磁场中的情况具备着两款极为常识化的题型,那就是顺... 携电粒子在有限磁场中的运动问题是历年高考试卷中所要考查的经典内容,而相关于圆形有限磁场的知识内容又是其热点中的焦点部分。在我们高中阶段的物理科目学习内容中,含电粒子在圆形磁场中的情况具备着两款极为常识化的题型,那就是顺着径向射入磁场及不顺着径向射入磁场两类情况。依托对其中的基本运动模型展开分析,探讨经典例题中的具体运用过程,目的在于成功攻克此种高考中的关键考点问题,切实帮助我们同学们把握住这一部分的解题规律。 展开更多
关键词 高中学习 磁场圆 轨迹 解题方法
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解决带电粒子在圆磁场中运动的基本方法
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作者 刘璐璐 《中学课程资源》 2016年第9期58-60,共3页
带电粒子在有界磁场中的运动是高考的热点,而圆形有界磁场问题又是热点中的热点。在高中物理学习中,带电粒子在圆磁场中有两种比较常见的题型,即沿径向射入和不沿径向射入,通过对基本模型的分析,针对典型例题具体应用,旨在攻克这... 带电粒子在有界磁场中的运动是高考的热点,而圆形有界磁场问题又是热点中的热点。在高中物理学习中,带电粒子在圆磁场中有两种比较常见的题型,即沿径向射入和不沿径向射入,通过对基本模型的分析,针对典型例题具体应用,旨在攻克这一高考难点。 展开更多
关键词 高中物理 磁场圆半径 轨迹半径 心角
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圆电流磁场公式的验证演示
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作者 郭一 谭祖文 何桂荣 《大学物理》 1983年第10期20-23,共4页
关键词 电流磁场 公式 验证 演示 定律
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两条几何规律在圆边界磁场中的应用
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作者 柯尧 《物理通报》 2018年第5期80-81,共2页
通过两条简单的几何规律求解两道高考题,总结出了带电粒子在圆边界磁场中运动的两个结论,这两个结论在解相关题时可谓屡试不爽.
关键词 带电粒子运动 边界磁场 两条规律
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对地磁发电机理论的反思与天体磁场研究展望 被引量:1
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作者 李安生 李国栋 《地球物理学进展》 CSCD 北大核心 2010年第3期809-816,共8页
由地球磁场的基本特征和电磁场理论,证明了流体外核不可能产生偶极磁场,地磁发电机理论对偶极磁场是无效的.并对地球和天体磁场的研究方向和方法进行了展望:偶极场与核心部分的自组织结构有关,多极子场与外部各层的组织结构或运动状态有关.
关键词 地磁发电机理论 偶极磁场 环电流磁场 磁学研究 天体磁场 自组织结构
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电荷均匀面分布带电体旋转轴线上的磁场分布
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作者 薛海国 《佳木斯职业学院学报》 2018年第9期281-282,共2页
利用圆电流轴线上的磁场公式,分析了均匀带电圆圈、圆柱面、球面匀角速旋转时轴线上的磁场分布。
关键词 均匀带电体 磁场分布 电流磁场
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Cone-shaped source characteristics and inductance effect of transient electromagnetic method 被引量:10
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作者 杨海燕 李锋平 +3 位作者 岳建华 郭福生 刘旭华 张华 《Applied Geophysics》 SCIE CSCD 2017年第1期165-174,192,共11页
Small multi-turn coil devices are used with the transient electromagnetic method (TEM) in areas with limited space, particularly in underground environments such as coal mines roadways and engineering tunnels, and f... Small multi-turn coil devices are used with the transient electromagnetic method (TEM) in areas with limited space, particularly in underground environments such as coal mines roadways and engineering tunnels, and for detecting shallow geological targets in environmental and engineering fields. However, the equipment involved has strong mutual inductance coupling, which causes a lengthy turn-off time and a deep “blind zone”. This study proposes a new transmitter device with a conical-shape source and derives the radius formula of each coil and the mutual inductance coefficient of the cone. According to primary field characteristics, results of the two fields created, calculation of the conical-shaped source in a uniform medium using theoretical analysis, and a comparison of the inductance of the new device with that of the multi-turn coil, show that inductance of the multi-turn coil is nine times greater than that of the conical source with the same equivalent magnetic moment of 926.1 A·m2. This indicates that the new source leads to a much shallower “blind zone.” Furthermore, increasing the bottom radius and turn of the cone creates a larger mutual inductance but increasing the cone height results in a lower mutual inductance. Using the superposition principle, the primary and secondary magnetic fields for a conical source in a homogeneous medium are calculated; results indicate that the magnetic behavior of the cone is the same as that of the multi-turn coils, but the transient responses of the secondary field and the total field are more stronger than those of the multi-turn coils. To study the transient response characteristics using a cone-shaped source in a layered earth, a numerical filtering algorithm is then developed using the fast Hankel transform and the improved cosine transform, again using the superposition principle. During development, an average apparent resistivity inverted from the induced electromotive force using each coil is defined to represent the comprehensive resistivity of the conical source. To verify the forward calculation method, the transient responses of H type models and KH type models are calculated, and data are inverted using a “smoke ring” inversion. The results of inversion have good agreement with original models and show that the forward calculation method is effective. The results of this study provide an option for solving the problem of a deep “blind zone” and also provide a theoretical indicator for further research. 展开更多
关键词 Transient electromagnetic method Cone-shaped source Apparent resistivity Mutual inductance “Smoke ring” inversion
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提高空调电机专业性能的现代设计方法
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作者 胡毓鋆 成良玉 胡晓华 《微特电机》 北大核心 1997年第5期9-11,共3页
分析了传统空调电机设计存在的问题,提出了提高空调电机专用性能的设计方法,介绍了新一代专用的空调电机智能多目标优化设计集成软件系统。指出采用现代设计手段,淘汰落后的人工和一般机辅设计方法的必要性。
关键词 空调电机 单相电机 磁场圆 软件 优化设计
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电磁悬浮技术中导体元受电磁力的计算 被引量:1
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作者 邰显康 云月厚 刘学东 《内蒙古大学学报(自然科学版)》 CAS CSCD 北大核心 2002年第2期145-148,共4页
为解决电磁悬浮技术中导体受电磁力的估算 ,用解析函数拟合级数代替对无穷级数求和 ,得到圆电流磁场的解析解 .分析了圆电流非近轴区导体元所受的电磁力 ,讨论了在圆电流和螺线磁场中导体受趋肤效应的影响 .为电磁悬浮设计线圈提供一种... 为解决电磁悬浮技术中导体受电磁力的估算 ,用解析函数拟合级数代替对无穷级数求和 ,得到圆电流磁场的解析解 .分析了圆电流非近轴区导体元所受的电磁力 ,讨论了在圆电流和螺线磁场中导体受趋肤效应的影响 .为电磁悬浮设计线圈提供一种简明的计算方法 . 展开更多
关键词 电磁悬浮 导体元 电磁力 电流磁场 解析函数 超肤效应 计算方法
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Analysis of circular-to-circular groove waveguide junction 被引量:1
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作者 崔立成 杨鸿生 《Journal of Southeast University(English Edition)》 EI CAS 2003年第1期17-21,共5页
Mode matching method is used to analyze the scattering characteristics of thecircular-to-circular groove waveguide junction. Matching the electric fields and magnetic fields atthe boundary of the junction, and multipl... Mode matching method is used to analyze the scattering characteristics of thecircular-to-circular groove waveguide junction. Matching the electric fields and magnetic fields atthe boundary of the junction, and multiplying the mode functions of the circular waveguide andcircular groove waveguide on both sides of the boundary equation, the scattering matrix equation isobtained, the scattering coefficients can be obtained from the equation. Then the scatteringcharacteristics of the iris with circular window in circular groove waveguide are analyzed. At lastthe convergent problem is discussed; when choosing a suitable mode group, convergent numericalresults are obtained, and the frequency response of the iris' scattering coefficients is also given. 展开更多
关键词 circular groove waveguide circular-to-circular groove waveguide junction mode matching method
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帯电粒子在圆形匀强磁场中的运动规律
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作者 张敏 《知识窗(教师版)》 2020年第16期73-73,共1页
带电粒子在匀强磁场中的运动是高中物理常见的问题,其中有界磁场是经常考查的知识点,也是学生学习的难点。究其根源,是学生不理解其中的规律。
关键词 形匀强磁场 轨迹 磁场圆 磁发散 磁聚焦
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CALCULATION OF NONLINEAR MAGNETIC FIELDS IN CYLINDRICALLY SYMMETRIC SYSTEM 被引量:3
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作者 Wu Xunlei Chen Xinqiao Ding Yaogen (Institute of Electronics, Chinese Academy of Sciences, Beijing 100080) 《Journal of Electronics(China)》 2003年第1期33-37,共5页
For the calculation of non-linear magnetic fields, a simple program can be as effective as a large commercialized software package. If relaxation methods are used, they must include successive over-relaxation and unde... For the calculation of non-linear magnetic fields, a simple program can be as effective as a large commercialized software package. If relaxation methods are used, they must include successive over-relaxation and under-relaxation and much attention must be paid to the relaxation factor and the interpolation. In this paper some skills are proposed on the setting of an interpolation switch and the choosing of saturation point so as to assure satisfied convergence properties. The numerical results by using these methods conform well to the tests. 展开更多
关键词 SATURATION CONVERGENCE INTERPOLATION
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透析带电粒子在圆边界磁场中的磁发散与磁聚焦现象 被引量:5
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作者 吴建鹏 《中学物理教学参考》 2020年第18期18-19,共2页
以大量具有相同比荷的带电粒子为研究对象,探究其在圆边界匀强磁场中的运动规律,发现粒子在圆磁场中呈现出的磁发散与磁聚合等有趣现象与带电粒子的轨道半径r及圆磁场半径R密切相关,对此分别进行了讨论、分析及规律总结。
关键词 带电粒子 边界磁场 磁发散与磁聚焦
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Inversion of an Atomic Wave Packet in a Circularly Polarized Electromagnetic Wave
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作者 ZENGGao-Jian 《Communications in Theoretical Physics》 SCIE CAS CSCD 2001年第1期83-86,共4页
We study behavior of an atomic wave packet in a circularly polarized electromagnetic wave, and particularly calculate the atomic inversion of the wave packet. A general method of calculation is presented. The results ... We study behavior of an atomic wave packet in a circularly polarized electromagnetic wave, and particularly calculate the atomic inversion of the wave packet. A general method of calculation is presented. The results are interesting. For example, if the wave packet is very narrow or/and the interaction is very strong, no matter the atom is initially in its ground state or excited state, the atomic inversion approaches zero as time approaches infinity. If the atom is initially in its ground state and excited state with the probability 1/2 respectively, and if the momentum density is an even function, then the atomic inversion equals zero at any time. 展开更多
关键词 atomic inversion atomic wave packet circularly polarized electromagnetic wave
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The Weak Magnetic Photon Emission from Quark-gluon Plasma
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作者 SUN Jing’an YAN Li 《原子核物理评论》 CAS CSCD 北大核心 2024年第1期558-563,共6页
There must be electromagnetic fields created during high-energy heavy-ion collisions.Although the electromagnetic field may become weak with the evolution of the quark-gluon plasma(QGP),compared to the energy scales o... There must be electromagnetic fields created during high-energy heavy-ion collisions.Although the electromagnetic field may become weak with the evolution of the quark-gluon plasma(QGP),compared to the energy scales of the strong interaction,they are potentially important to some electromagnetic probes.In this work,we propose the coupled effect of the weak magnetic field and the longitudinal dynamics of the background medium for the first time.We demonstrate that the induced photon spectrum can be highly azimuthally anisotropic when the quarkgluon plasma is in the presence of a weak external magnetic field.On the other hand,the weak magnetic photon emission from quark-gluon plasma only leads to a small correction to the photon production rate.After hydrodynamic evolution with a tilted fireball configuration,the experimentally measured direct photon elliptic flow is well reproduced.Meanwhile,the used time-averaged magnetic field in the hydrodynamic stage is found no larger than a few percent of the pion mass square. 展开更多
关键词 heavy-ion collision the direct photon weak magnetic field elliptic flow
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Rotating magnetic field-controlled fabrication of magnetic hydrogel with spatially disk-like microstructures 被引量:6
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作者 Fengguo Fan Jianfei Sun +5 位作者 Bo Chen Yang Li Ke Hu Peng Wang Ming Ma Ning Gu 《Science China Materials》 SCIE EI CSCD 2018年第8期1112-1122,共11页
Composite biomaterials with controllable mi- crostructures play an increasingly important role in tissue engineering and regenerative medicine. Here, we report a magnetic hydrogel composite with disk-like microstructu... Composite biomaterials with controllable mi- crostructures play an increasingly important role in tissue engineering and regenerative medicine. Here, we report a magnetic hydrogel composite with disk-like microstructure fabricated by assembly of iron oxide nanopartides during the gelation process in the presence of rotating magnetic field. It should be mentioned that the iron oxide nanoparticles here were synthesized identically following techniques of Fer- umoxytol that is the only inorganic nanodrug approved by FDA for clinical applications. The microstructure of nano- particles inside the hydrogel was ordered three-dimensionally due to the twist of the aligned chains of magnetic nano- particles which leads to the lowest state of systematic energy. The size of microstructure can be tuned from several micro- meters to tens of micrometers by changing the assembly parameters. With the increase of microstructure size, the magnetothermal anisotropy was also augmented. This result confirmed that the assembly-induced anisotropy can occur even for the several micron aggregates of nanopartides. The rotating magnetic field-assisted technique is cost-effective, simple and flexible for the fabrication of composite hydrogel with ordered microstructure. We believe it will be favorable for the quick, green and intelligent fabrication of some com- posite materials. 展开更多
关键词 magnetic nanoparticles assembly rotating magnetic field hydrogel intelligent fabrication
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