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Caught speeding:Clocking the fastest-spinning brown dwarfs（图）
Caught speeding Clocking fastest-spinning brown dwarfs
2021/4/23
Astronomers have discovered the most rapidly rotating brown dwarfs -- three brown dwarfs that each complete a full rotation roughly once every hour. The rate is so extreme that if they rotated any fas...
A Sea of Spinning Electrons（图）
Sea Spinning Electrons
2017/10/25
Picture two schools of fish swimming in clockwise and counterclockwise circles. It’s enough to make your head spin, and now scientists at Rutgers University-New Brunswick and the University of Florida...
The brown recluse spider engineers extra-strong silk by spinning loops onto a flat strand
The brown recluse spider engineers extra-strong silk spinning loops flat strand
2017/3/14
It helps to know a little about the brown recluse to fully understand the discovery about what makes the silk of this particular spider so strong.An international collaboration between William & Mary ...
A team of researchers, led by a group at the University of California, Riverside, have demonstrated for the first time the transmission of electrical signals through insulators in a sandwich-like stru...
Web-spinning sawflies of the genus Cephalcia Panzer (Hymenoptera, Pamphiliidae) in the Picea abies forests of the Beskidy Mountains (Poland)
web-spinning sawfly Picea abies Cephalcia
2015/3/6
This article presents a review of data and results of investigations from the period 1958–2006 regarding the occurrence of insects of the genus Cephalcia Panzer (Hymenoptera, Pamphiliidae) in Norway s...
On the occurrence of web-spinning sawflies of the genus Cephalcia (Hymenoptera, Pamphiliidae) in the Czech Republic
clonal test linear mixed models spatial analysis
2015/3/6
A 6-year-old clonal trial with 13 clones of wild cherry (Prunus avium L.) was evaluated during the summer of 2004 at 6 different sites in the Czech Republic. Observed traits were the stem height, stem...
Spinning-particle model for the Dirac equation and the relativistic Zitterbewegung
Spinning-particle model the Dirac equation the relativistic Zitterbewegung
2011/7/28
Abstract: We construct the relativistic particle model without Grassmann variables which meets the following requirements. A) Canonical quantization of the model implies the Dirac equation. B) The var...
基于小波-Contourlet变换与Cycle Spinning相结合的SAR图像去噪
小波Contourlet变换 小波去噪 Contourlet变换去噪 合成孔径雷达图像去噪
2013/8/19
由于合成孔径雷达（SAR）在农业、林业、水文、地矿、海洋、测绘等领域广泛应用，SAR图像质量和视觉效果提升成为了各国学者研究的热点问题。SAR图像的主要噪声源——相干斑噪声的抑制和去除显得越来越重要。本文通过分析了SAR图像的噪声成因以及其噪声模型。基于SAR图像的特性，本文结合小波变换和Contourlet变换各自的优点，提出了一种基于小波-轮廓波变换与图像循环平移结合的SAR图像去噪算法。本文...
压下量对梯形内齿轮旋压成形质量的影响（Effect of Reduction on Quality of Trapezoidal Inner Gear Formed by Spinning）
梯形内齿轮 旋压 压下量 成形质量
2010/12/28
旋压成形技术是杯形薄壁内齿轮加工的新方法，其中压下量对内齿轮成形质量的影响最大。采用有限元数值模拟和试验相结合的方式，以相对齿高和齿顶不均匀度为质量评价参数，研究了压下量对梯形内齿轮旋压成形质量的影响。结果表明，对于一定齿高轮齿的成形，对应一定壁厚的毛坯，存在着一个最佳压下量，采用该压下量成形，轮齿充填质量最好；小于该值时，充填材料不够；大于该值时，材料整体变形量过大将导致成形缺陷。
Quantum dispersion relations for excitations of long folded spinning superstring in AdS_5 x S^5
Quantum dispersion relations folded spinning superstring
2010/12/23
We use AdS_5 x S^5 superstring sigma model perturbation theory to compute the leading one-loop corrections to the dispersion relations of the excitations near a long spinning string in AdS. This inves...
Fine structure of the Poynting-Robertson effect for a luminous spinning relativistic star
Fine structure the Poynting-Robertson effect
2010/12/27
As a sequel to our recent works challenging toward the systematic inclusion of the effect of radiation on the trajectory of a test particle orbiting around a luminous spinning relativistic star event...
Superkicks in ultrarelativistic encounters of spinning black holes
Superkicks ultrarelativistic encounters spinning black holes
2010/12/20
We study ultrarelativistic encounters of two spinning, equal-mass black holes through simulations in full numerical relativity. Two initial data sequences are studied in detail: one that leads to scat...
Matrix Factorization for an SO(2) Spinning Top and Related Problems
Matrix Factorization SO(2) Spinning Top Related Problems
2010/11/1
We study the matrix factorization problem associated with an SO(2) spinning top by using the algebro-geometric approach. We derive the explicit expressions in terms of Riemann theta functions and dis...
A Ray-Tracing Algorithm for Spinning Compact Object Spacetimes with Arbitrary Quadrupole Moments. I. Quasi-Kerr Black Holes
black hole physics radiative transfer relativity
2010/12/21
We describe a new numerical algorithm for ray tracing in the external spacetimes of spinning compact objects characterized by arbitrary quadrupole moments. Such spacetimes describe non-Kerr vacuum sol...
Fine structure of the Poynting-Robertson effect for a luminous spinning relativistic star
Fine structure Poynting-Robertson effect luminous spinning relativistic star
2010/12/21
As a sequel to our recent works challenging toward the systematic inclusion of the effect of
radiation on the trajectory of a test particle orbiting around a luminous spinning relativistic star event...