Topological States of Matter

<正>Novel Topological Orders In the field of topological states of matter,scientists at the Institute of Physics(IOP),CAS predicted a series of novel topological orders of matter and verified the theoretical predictions in a series of novel materials.In 2009,IOP physicists predicted Bi_2Te_3,Bi_2Se_3,and Sb_2Te_3 as three-dimension topological insulators.Later experimentally validated,these materials have now become the most widely studied topological insulators.During the period from 2012 to 2014,IOP scientists theoretically predicted and experimentally verified two Dirac semimetals,namely Na_3Bi and Cd_3As_2,establishing the semimetal state as a new state of matter.     

宇宙中的暗物质

宇宙由什么组成？目前为止，我们还不知道。但是如果标准的引力理论成立，那么宇宙中的大部分物质是一种无法被发现的形式存在，这些物质发出的光，当今的所有望远镜还不能观测到，这些看不见的物质就是暗物质。     

现代建筑关注的问题

现代建筑应该关注下面几个方面的问题: 1 新兴建筑的艺术风格问题 现代美术和现代建筑如出一辙,两者都致力于帮助人们找出在新世界里的立足点.建筑大师承认现代建筑的艺术特点,比如路易斯-沙利文(Louis Sullivan)曾说过:"……能算得上是真正艺术品的建筑,其本质和精髓必定是情感的表达."     

颗粒物质运动规律的研究

简述颗粒物质研究的历史和颗粒物质研究的现状,以及颗粒物质研究的重要意义、通过实验得出：圆筒底面所受压力会随圆简直径增大而增大,但达到饱和压力后就不再增大,同时圆筒底面压力会随颗粒直径增大而增大;平面传送带的流量主要受传送带的速度和瓶颈开口大小的影响,但在一定瓶颈开口大小下,存在临界速度,流量关系会发生突变。     

石家庄市大气颗粒物污染特征研究

选取石家庄市6个点位,采用重量法进行大气中TSP、PM10、PM2.5的采样和分析,利用相关系数法对测定结果进行相关性分析,得到其相关系数。分析结果表明,石家庄市PM10和PM2.5污染严重,TSP与PM10和PM10与PM2.5有良好的线性关系,相关系数分别为0.9425和0.9119;PM10/TSP平均值为0.75,PM2.5/PM10平均值为0.56,细颗粒物污染严重。     

Indirect Searches of Dark Matter in Space

Dark matter(DM) is a form of matter necessary to account for gravitational effects observed in very large scale structures such as anomalies in the rotation of galaxies and the gravitational lensing of light by galaxy clusters that cannot be accounted for by the quantity of observed matter (Bertone et al.2005).In the standard cosmology model.     

Dark Matter: Astrophysical Evidence and Constraints

<正>1. Introduction Modern physics and astronomy are now obscured by two "dark clouds," namely, dark matter and dark energy.All the stuff that we are familiar with in our everyday life,such as flowers, rocks, water and air, which are made of molecules or atoms, including electrons and photons,constitutes only 5% of the energy content of the universe.Even the standard model of elementary particles, the most successful ever, is only able to explain such a small     

Dark Matter Particle Detection and LHAASO Experiment

<正>We have never reserved our efforts to understand the universe in which we are living.Through observing the movement of the Sun,the Moon and other celestial objects,we have mastered the laws governing the day/night alternation and seasonal changes,and applied them in agricultural production,calendar formulation,and time calibration.From the precise movement of planets,Kepler discovered the three laws of planetary motion,which later inspired Newton's law of gravity.The invention of the telescope has greatly enlarged     

论元极学物质观

结合现代物理学、大爆炸宇宙学理论，论述了元极学物质观的若干重要的基本内容，如三元及其三极运化规律，无，有等，阐述了该理论的新颖性，深刻性及其科学价值。     

New Gravitational Lenses for Dark Matter Research

<正>Using data collected by the Hubble Space Telescope(HST),Dr.SHU Yiping and Prof.MAO Shude from the National Astronomical Observatories of China,Chinese Academy of Sciences(NAOC) and their collaborators have recently discovered a sample of 17 new strong gravitational lens systems,which is of unique significance to the study of the nature of dark matter and high-redshift Lyα emitters.     

Detection of Dark Matter Particles and Progress

<正>Dark matter is a type of invisible matter discovered by astronomers when observing the universe. The word "dark" refers to the mysterious fact that no electromagnetic radiation can be observed from this matter. As we know, the electromagnetic waves of different wavelengths are the medium on which astronomers rely to observe the universe. Figure 1 illustrates the     

Indirect Searches of Dark Matter in Spacc

Dark matter （DM） is a form of matter necessary to account for gravitational effects observed in very large scale structures such as anomalies in the rotation of galaxies and the gravitational lensing of light by galaxy clusters that cannot be accounted for by the quantity of observed matter （Bertone et al. 2005）. In the standard cosmology model, dark matter, dark energy and normal matter constitute about 23%, 72% and 5% of the energy density of the universe,     

Determining Local Dark Matter Density with LAMOST Data

正A recent study conducted by researchers from the National Astronomical Observatories of the Chinese Academy of Sciences(NAOC)has shed new lights on the mass density of the dark matter in the local volume around the Sun.With carefully selected LAMOST data and a simple analytical Kz force model,they concluded that the volume density of the dark matter around us is 0.018±0.005M.pc~(-3),higher than the results of     

Tracking the Voice of Dark Matter in Space

On the early morning of Dec 17,2015,China successfully sent"Wukong",its first dark matter particle detector satellite into the preset orbit(page 209).Independently designed and developed by CAS,this satellite unveiled a new era of space science for China.In an interview with BCAS,Prof.Roger-Maurice Bonnet,former Science Director of ESA made comments on CAS'science satellite program and space science(page 211).     

Indirect Detection of Dark Matter Particles in Space

<正>Over the past decades, human beings greatly advanced our understanding of the universe with brilliant accomplishments. Based on the results of recent astronomical observations, a standard cosmological model combining dark matter, dark energy and cosmic inflation has been established. Figure 1 shows the composition of our universe:only 5% of the entire universe is made of known elementary particles, about     

新型微波激射器有望探测超轻暗物质

3月4日,记者从中国科学技术大学获悉,该校彭新华教授研究组及其合作者首次在弗罗凯量子体系上实现微波激射器,为超高精度超低频磁场测量以及暗物质搜寻等研究提供了全新途径。该成果日前发表于《科学进展》。微波激射器是利用电磁波与原子或分子等量子系统的共振相互作用。