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North Atlantic haddock use magnetic compass to guide them（图）
North Atlantic haddock magnetic compass guide
2019/10/18
A new study has found that the larvae of haddock, a commercially important type of cod, have a magnetic compass to find their way at sea. Haddock larvae orient toward the northwest using Earth's magne...
Researchers Find Glass Eels Use Internal Compass to Find Their Way Home
Researchers Glass Eels Internal Compass Find Their Way Home
2017/7/21
Scientists are closer to unraveling the long-standing mystery of how tiny glass eel larvae, which begin their lives as hatchlings in the Sargasso Sea, know when and where to "hop off" the Gulf Stream ...
Scientists crack secrets of the monarch butterfly’s internal compass
Scientists monarch butterfly internal compass
2016/4/25
ach fall, monarch butterflies across Canada and the United States turn their orange, black and white-mottled wings toward the Rio Grande and migrate over 2,000 miles to the relative warmth of cen...
自适应SCKF在高动态COMPASS信号参数估计中的应用
高动态 北斗二号系统 平方根容积卡尔曼滤波 自适应估计 参数估计
2014/4/11
高动态环境下北斗二号导航信号具有较高的非线性特性，载波参数估计难以保证较高的精度。在分析高阶非线性载波模型的基础上，提出了一种基于平方根容积卡尔曼滤波（SCKF）的自适应滤波算法，对载波相位及其三阶导数进行估计。该算法使用容积数值积分原则直接计算非线性随机函数的均值和方差，且在迭代滤波过程中，利用移动窗口法通过最新量测信息来改进过程噪声和量测噪声的协方差阵，可获得较高的估计精度。仿真结果表明，相比...
针对Compass电离层二阶改正存在的问题，提出利用小波包分析算法对观测值进行消噪，再进行三频二阶改正的方法。利用Compass仿真数据的试验表明，小波消噪算法能够大大削弱观测噪声，有利于提高Compass三频二阶改正的精度，增强其可行性和有效性。
Travelling Randomly on the Poincaré Half-Plane with a Pythagorean Compass
Random motions Poisson process telegraph process hyperbolic and spherical trigonometry
2011/9/20
Abstract: A random motion on the Poincar\'e half-plane is studied. A particle runs on the geodesic lines changing direction at Poisson-paced times. The hyperbolic distance is analyzed, also in the cas...
针对区域导航系统卫星轨道预报精度差、在轨卫星故障或者 GEO 卫星轨道机动后轨道快速恢复等问题，对独立时间同步体制下区域卫星导航系统的广域差分技术进行了深入研究，从非传统力学的角度提出了通过单历元广域差分进行星历误差改正的技术，完善了广域差分星历误差改正体制；并通过协方差矩阵分析了广域差分星历改正数误差传播规律，设计了控制误差传播放大的算法。模拟实验结果证明，在时间同步条件下可以通过发播等效钟差改...
COMPASS is a multi-purpose fixed-target experiment at the CERN Super Proton Synchrotron
investigating the structure and spectrum of hadrons. One primary goal is the search for new
hadronic states, i...
Comment on "Quantum Control and Entanglement in a Chemical Compass"
Quantum Control Entanglement a Chemical Compass
2010/10/29
In this comment we show that the avian compass entanglement considerations of J. Cai, G. G. Guerreschi and H. J. Briegel (Phys. Rev. Lett. 104, 220502 (2010)) result in unphysical predictions on the m...
QBI researchers discover "inner compass" in the human brain
QBI researchers inner compass the human brain
2010/10/13
If you have ever lost your sense of direction in an unfamiliar place, then researchers at the Queensland Brain Institute may be able to help.They have discovered that a person's ability to find their ...
We present first results of a partial wave analysis of the diffractive reaction $\pi- Pb \to \pi- \pi+ \pi- Pb$ based on data from the COMPASS experiment taken during a pilot run in 2004 using a 190 ...
Roots of any Polynomial with Complex Integer Coefficients using Replacement Sequences, Ruler and Compass
Roots Polynomial Complex Integer Coefficients Replacement Sequences
2010/11/1
The roots of any polynomial of degree m with complex integer coefficients can be computed by manipulation of sequences made from distinct symbols and counting the different symbols in the sequences. T...