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When the Large Hadron Collider (LHC) is operating, it produces more than one billion proton–proton interactions every second. But exactly how many take place in the LHC experiments? Critical to every ...
清华大学社会科学学院政治学系胡悦副教授《Democracy, Public Support, and Measurement Uncertainty》一文刊发于《American Political Science Review》
清华大学社会科学学院政治学系 胡悦 Democracy, Public Support, and Measurement Uncertainty American Political Science Review 民主政权
2022/7/12
2022年5月，清华大学政治学系胡悦副教授、爱荷华大学邰月红及爱荷华大学Frederick Solt共著的题为“Democracy, Public Support, and Measurement Uncertainty”一文，在政治学顶级期刊American Political Science Review（《美国政治科学评论》）上网络首发。三位研究者聚焦民主政权与公众支持的关系，并且对这一领域...
VLBA Measurement Promises Complete Picture of Milky Way（图）
VLBA Measurement Complete Picture Milky Way
2017/10/26
Astronomers using the National Science Foundation’s Very Long Baseline Array (VLBA) have directly measured the distance to a star-forming region on the opposite side of our Milky Way Galaxy from the S...
JILA’s 3-D Quantum Gas Atomic Clock Offers New Dimensions in Measurement（图）
JILA 3-D Quantum Gas Atomic Clock New Dimensions Measurement
2017/10/25
JILA physicists have created an entirely new design for an atomic clock, in which strontium atoms are packed into a tiny three-dimensional (3-D) cube at 1,000 times the density of previous one-dimensi...
Dark Energy Survey reveals most accurate measurement of dark matter structure in the universe（图）
Dark Energy Survey most accurate measurement dark matter structure the universe
2017/9/4
Imagine planting a single seed and, with great precision, being able to predict the exact height of the tree that grows from it. Now imagine traveling to the future and snapping photographic proof tha...
Microchip enables fast,precise measurement of single-cell growth
Microchip fast precise measurement single-cell growth
2016/9/12
A new technique invented at MIT can precisely measure the growth of many individual cells simultaneously. The advance holds promise for fast drug tests, offers new insights into growth variation acros...
UCLA astronomers make first accurate measurement of oxygen in distant galaxy
UCLA astronomers first accurate measurement of oxygen galaxy
2016/8/11
UCLA astronomers have made the first accurate measurement of the abundance of oxygen in a distant galaxy. Oxygen, the third-most abundant chemical element in the universe, is created inside stars and ...
Physicists conduct most precise measurement yet of interaction between atoms and carbon surfaces
Physicists most precise measurement atoms and carbon surfaces
2015/6/18
Physicists at the University of Washington have conducted the most precise and controlled measurements yet of the interaction between the atoms and molecules that comprise air and the type of carbon s...
Boss quasars track the expanding universe: The most precise measurement yet
Boss quasars track expanding universe The most precise measurement yet
2014/4/16
The Baryon Oscillation Spectroscopic Survey (BOSS), the largest component of the third Sloan Digital Sky Survey (SDSS-III), pioneered the use of quasars to map density variations in intergalactic gas ...
Oldest Measurement of Earth's Magnetic Field Reveals Battle Between Sun and Earth for Our Atmosphere（图）
Sun and Earth Our Atmosphere Earth's Magnetic Field
2010/3/23
Scientists at the University of Rochester have discovered that the Earth's magnetic field 3.5 billion years ago was only half as strong as it is today, and that this weakness, coupled with a strong wi...
X-ray measurement of real-time variations at an organic interface（图）
X-ray measurement real-time variations organic interface
2009/7/20
One of the unavoidable realities of our era is that fossil fuels are not infinite. Someday, and sooner rather than later, available stores will be exhausted. To overcome the supply and other limitatio...
Efficient measurement of large light sources for optical simulation and design（图）
Efficient measurement large light sources optical simulation optical design
2009/7/20
Like any task in optical design, large lighting projects such as architectural, automotive, street, security, or entertainment systems still need to be characterized for output color and luminance. Ho...
April 26, 2007，Materials scientists will tell you that to best understand, characterize and eventually utilize the properties of a specific material, you have to be able to define how the atoms within...
national institute of standands and technology Report on U.S. Innovation Tags Measurement Challenges
Measurement System measurement infrastructure
2007/2/28
February 15, 2007，A new report from the National Institute of Standards and Technology (NIST), An Assessment of the United States Measurement System: Addressing Measurement Barriers to Accelerate Inno...
national institute of standands and technology Report Addresses Scientific and Technical Measurement Challenges Key to Sustaining U.S. Innovation
technical measurement
2007/2/13
Feb. 12, 2007，GAITHERSBURG, Md.—A new report based on an analysis of more than 700 scientific and technical measurement challenges facing U.S. industry today, calls on the public and private sectors t...