搜索结果: 46-60 共查到“带电粒子光学”相关记录165条 . 查询时间(2.512 秒)
We study a particle moving at unit speed in a channel made by
connected self-similar billiard tables that grow in size by a factor r > 1
from left to right (this model was recently introduced in phy...
FERMI ACCELERATION
FERMI ACCELERATION particle
2015/9/29
Fermi acceleration is a mechanism, first suggested by
Enrico Fermi in 1949, to explain heating of particles in cosmic
rays.
在计算流体动力学的实际应用中无反射边界条件是一个重要的研究课题. 文中应用时间插值的特征线方法构造了一种新式的拉氏边界条件,并应用在光滑粒子法中. 该方法与使用特征线方法的欧拉边界条件方法相比,不需要区分超声速和亚声速流的不同,并且在入流和出流中具有相同的形式,因而更加简便易行. 数值结果表明,采用时间插值特征线法的拉氏边界条件方法在稀疏波、激波以及爆轰波的模拟中都能够得到较好的无反射效果.
基于相交不稳定性的尾流自消散机翼实验研究
飞机尾流 瑞利-路德维希不稳定性 水槽实验 粒子图像速度场 扰流片
2018/12/28
飞机尾流是复杂的流动现象,相关控制的研究常采用简化模型,抓住主要矛盾进行尾流不稳定性的学术探索. 采用结构化矩形机翼模型,通过添加扰流片来模拟襟翼的一种作动方式,引入一对与主翼涡反向的小涡,以期诱发尾涡的瑞利-路德维希相交不稳定性. 改变模型在水槽中的拖曳速度以及机翼攻角,采用粒子图像速度场仪定量研究单主翼尾涡发展特性以及双涡相互作用特性. 研究表明,未添加扰流片时,尾涡环量在45 个翼展内相对于...
轴向输出TE10模式的紧凑型相对论磁控管的粒子模拟
相对论磁控管 轴向输出 TE10模式 紧凑型
2016/7/15
研究了一种轴向输出TE10模式的紧凑型相对论磁控管，该器件采用6谐振腔结构并工作在π模式上，通过4腔轴向输出的结构设计使得谐振腔结构与矩形输出波导之间形成了较好的过渡，实现了矩形TE10模式的微波输出。与衍射输出相对论磁控管相比，这种结构设计不仅能减小磁控管的轴向和径向的尺寸，使得系统更加紧凑化，而且能在输出波导中获得更加纯净的低阶微波模式。利用粒子模拟软件，初步分析和优化了器件的工作性能。模拟结...
中国空间粒子探测器获阶段性成果
空间粒子 探测器
2015/3/1
中科院高能物理研究所研究员王焕玉2015年2月16日透露，该所科研团队投身攻关的空间X射线探测器技术取得阶段性成果，探测器功能性能指标达国际同类仪器水平，进入科研快车道。
Incorporating Dynamic Mean-Field Theory into Diagrammatic Monte Carlo
Diagram to monte carlo illustration skeleton diagram lattice model the propagators single particle
2014/12/19
The bold diagrammatic Monte Carlo (BDMC) method performs an unbiased sampling of Feyn- man's diagrammatic series using skeleton diagrams. For lattice models the eciency of BDMC can be dramatically im...
Creation of NOON states by double Fock-state/Bose-Einstein condensates
State of single particle state variable theory the measuring accuracy measuring phase the condensate
2014/12/19
NOON states (states of the form |N〉 a |0〉 b +|0〉 a |N〉 b where a and b are single particle states) have been used for predicting violations of hidden-variable theories (Greenbe...
Berezinskii-Kosterlitz-Thouless Transition in Two-Dimensional Dipole Systems
Super fluid fluid dipolar bosons path integral monte carlo simulation high density temperature particle excitation spectrum
2014/12/18
The superfluid to normal fluid transition of dipolar bosons in two dimensions is studied in a broad density range by using path integral Monte Carlo simulations and summarized in the phase diagram. Wh...
Regge kinematics in soft collinear effective theory
Particle kinematics reggeon field emissions reggeon exchange sports area
2014/12/18
We discuss the kinematics of the particles that make up a Reggeon in field theory, using the terminology of the soft collinear effective theory (SCET). Reggeization sums a series of strongly ordered c...
Critical entropies for magnetic ordering in bosonic mixtures on a lattice
Simulation worm algorithm 3 d optical lattice temperature system antiferromagnetic particles
2014/12/18
We perform a numeric study (Worm algorithm Monte Carlo simulations) of ultracold two-component bosons in two- and three-dimensional optical lattices. At strong enough interactions and low enough tempe...
Spiraling light, nanoparticles and insights into life's structure（图）
Spiraling light nanoparticles
2014/12/1
ANN ARBOR—Twisted light from ancient stars may have played a role in locking in aspects of the structure of life on Earth, and new findings from the University of Michigan provide insights into how th...
Goldilocks principle wrong for particle assembly: Too hot and too cold is just right（图）
cold right particle
2014/12/1
Microscopic particles that bind under low temperatures will melt as temperatures rise to moderate levels, but re-connect under hotter conditions, a team of New York University scientists has found. Th...
Princeton scientists observe elusive particle that is its own antiparticle
antiparticle Princeton scientists
2014/10/9
Princeton University scientists have observed an exotic particle that behaves simultaneously like matter and antimatter, a feat of math and engineering that could eventually enable powerful computers ...
