搜索结果: 1-15 共查到“知识库 数学物理”相关记录1440条 . 查询时间(1.148 秒)
《数学物理方法》课程团队
数学物理方法 物理学 师范
2022/12/29
数学物理方法是物理学（师范）专业的传统必修课程，是一门重要的专业基础课程。秉承学校“立教无类，以文化人”办学理念，《数学物理方法》教学团队为培养立足西部、扎根重庆、服务全国的物理学师范生，结合专业人才培养要求，设立了较为完善的课程培养目标，为提升学生学习的专业能力、增强学生应用数学研究和求解物理问题的信心、让学生感受物理之美、激发学生反思和终身学习的热情提供了必要数学物理准备。
结合线性回归的离轴数字全息去载波相位恢复算法
离轴数字全息 相位恢复 载波相移 线性回归
2022/3/24
为实现仅用一幅离轴数字全息图便能直接恢复相位，提出一种利用空间载波相移技术（spatialcarrierphaseshift，SCPS）和线性回归相结合的离轴数字全息去载波相位恢复算法。首先，利用SCPS将一幅离轴数字全息图分为四幅含有载波相移的全息图，其中载波相移由沿行、列两个方向的正交载波所引入；然后，将四幅载波相移全息图作为输入，将所求物体相位和两个正交的载波作为未知量，结合最小二乘法和线性...
外加应力作用下 UO2 中空洞演化过程的相场模拟
相场模拟 空洞演化 晶粒生长 外加应力
2022/3/24
本工作建立了外加应力作用下UO2中空洞演化的相场模型。首先，使用摄动迭代法求解了弹性平衡方程，对外加应力下单个空洞周围的应力分布进行了计算，结果表明空洞边缘有应力集中现象，模拟得到的应力分布和解析解一致。然后，利用相场方法模拟了不同外加应力下单个空洞的演化过程，结果表明随着外加应力的增大，空洞的生长速度加快。最后，研究了外加应力对多晶体系中晶粒长大和空洞演化的影响，结果表明，不同晶粒内的应力大小不...
机械通气患者胸部物理治疗效果的Meta分析
机械通气 胸部物理治疗 早期肺康复 Meta分析
2020/11/19
通过Meta分析评价胸部综合物理治疗对ICU机械通气患者的应用效果。方法 计算机检索PubMed、Web of Science、Sciencedirect、EMBASE、CINAHL、Wily online library、CBM、维普、万方和CNKI数据库,检索时限为建库至2018年9月,由2名评价员独立筛选文献、评价文献质量和提取指标数据,将评价指标数据用RevMan 5.3进行Meta分析。
延安地区土体多为湿陷性黄土,发生强降雨时,易发生滑坡、崩塌、窑洞垮塌等灾害,构成巨大安全隐患。通过室外现场试验,研究了不同日降雨量下入渗深度随入渗时间的变化规律,及含水率随深度的变化规律;通过室内直剪试验研究了含水率、干密度对粘聚力和内摩擦角的影响。结果表明:降雨对浅层土体含水率影响大,对深层土体影响较小,入渗深度随着入渗时间的增大而增大;黄土的抗剪强度随含水率的增大而减小,且是干密度越大减小的越...
HOLOMORPHIC FRAMES FOR WEAKLY CONVERGING HOLOMORPHIC VECTOR BUNDLES
HOLOMORPHIC FRAMES HOLOMORPHIC VECTOR BUNDLES
2015/12/17
Perhaps the most useful analytic tool in gauge theory is the Uhlenbeck compactness theoremfor sequences of unitary connections on hermitian vector bundles [U]. Given connections {Dj} ona bundle E over...
HIGGS BUNDLES AND LOCAL SYSTEMS ON RIEMANN SURFACES
HIGGS BUNDLES LOCAL SYSTEMS RIEMANN SURFACES
2015/12/17
These notes are based on lectures given at the Third International School on Geometry and Physics at the Centre de Recerca Matem`atica in Barcelona, March 26–30, 2012. The aim ofthe School’s four lect...
Highly directive current distributions:General theory
Highly directive current distributions General theory
2015/10/16
A theoretical scheme for studying the properties of localized, monochromatic, and highly directive classical current distributions in two and three dimensions is formulated and analyzed. For continuou...
Electromagnetic fields in air of traveling-wave currents above the earth
Electromagnetic fields air of traveling-wave currents the earth
2015/10/16
The problem of the electromagnetic field created by a thin, straight conductor of infinite length carrying a forward traveling-wave current with a complex propagation constant g above a homogeneous an...
Asymptotic formula for the condensate wave function of a trapped Bose gas
Asymptotic formula condensate wave function trapped Bose gas
2015/10/16
An analytical property is pointed out for the universal differential equation first derived by Dalfovo, Pitaevskii, and Stringari for the condensate wave function at the boundary of a trapped Bose gas...
Two-dimensional,highly directive currents on large circular loops
Two-dimensional highly directive currents large circular loops
2015/10/16
Properties of idealized, two-dimensional current distributions on circular loops are investigated analytically via the solution of a constrained optimization problem.The directivity in the far field i...
Exactly calculable field components of electric dipoles in planar boundary
calculable field components electric dipoles planar boundary
2015/10/16
The Sommerfeld integrals for the electromagnetic fields in the planar boundary between air and a homogeneous, isotropic medium, due to a horizontal and a vertical electric dipole each lying along the ...
Radiation of horizontal electric dipole on large dielectric sphere
Radiation horizontal electric dipole large dielectric sphere
2015/10/16
The electromagnetic field in air of a radiating electric dipole located below and tangential to the surface of a homogeneous, isotropic and optically dense sphere is studied anew. The starting point i...
Electronic structure of solid nitromethane:Effects of high pressure and molecular vacancies
Electronic structure solid nitromethane high pressure and molecular vacancies
2015/10/16
The combined effect of pressure and molecular vacancies on the atomic structure and electronic properties of solid nitromethane, a prototypical energetic material, is studied at zero temperature.The s...
THE LOW-FREQUENCY ELECTRIC FIELDS INDUCED IN A SPHERICAL CELL INCLUDING ITS NUCLEUS
LOW-FREQUENCY ELECTRIC FIELDS INDUCED SPHERICAL CELL NUCLEUS
2015/10/16
After a review of work leading to the determination of the electric field induced in the human body when exposed to the electromagnetic field near an extremely-low-frequency high-voltage transmission ...