静压液浮陀螺仪的热分析和热设计

静压液浮陀螺仪是一种耐振动、抗冲击、承载能力强的中、高精度陀螺仪。随着对陀螺仪使用精度的日益提高,必须从陀螺仪的数学模型入手,建立陀螺仪的热模型,对陀螺仪进行热分析、热设计和热补偿,才能有效地减少温度对陀螺仪一次项误差的影响。     

地球重力场空间探测: 回顾与展望

地球重力场的科学数据在地球测绘学、冰川学、陆地水循环、固体地球物理、灾害监控及国防军事等领域具有重要应用价值. 美、德合作研制的地球重力场反演与气候实验(gravity recovery and climate experiment, GRACE)卫星, 有力地推动了地球重力场测量、反演和应用. 为进一步提高重力卫星科学数据的时、空分辨率, 扩展应用领域, 中国及欧美等国都考虑发射升级的重力卫星, 即后GRACE 计划(GRACE-follow-on). 本文将简单回顾重力卫星的发展历程, 介绍重力卫星的数据采集技术和反演方法, 亦着重阐述后GRACE计划的测量方法学、关键技术及预期结果.      

Solving ground eigenvalue and eigenfunction of spheroidal wave equation at low frequency by supersymmetric quantum mechanics method

The spheroidal wave functions are found to have extensive applications in many branches of physics and mathematics. We use the perturbation method in supersymmetric quantum mechanics to obtain the analytic ground eigenvalue and the ground eigenfunction of the angular spheroidal wave equation at low frequency in a series form. Using this approach, the numerical determinations of the ground eigenvalue and the ground eigenfunction for small complex frequencies are also obtained.     

Ground eigenvalue and eigenfunction of a spin-weighted spheroidal wave equation in low frequencies

Spin-weighted spheroidal wave functions play an important role in the study of the linear stability of rotating Kerr black holes and are studied by the perturbation method in supersymmetric quantum mechanics.Their analytic ground eigenvalues and eigenfunctions are obtained by means of a series in low frequency.The ground eigenvalue and eigenfunction for small complex frequencies are numerically determined.