搜索结果: 16-29 共查到“理学 CLOCK”相关记录29条 . 查询时间(0.078 秒)
Tackling the blackbody shift in a strontium optical lattice clock
blackbody shift strontium optical lattice clock
2010/10/26
A major obstacle for optical clocks is the frequency shift due to black body radiation. We discuss how one can tackle this problem in an optical lattice clock; in our case 87Sr: firstly, by a measurem...
Chaotic neuron clock
Chaotic neuron clock
2010/11/15
A simple threshold model of neuron firing (with the neuron membrane electrochemical potential governed by the chaotic Rossler attractor) has been analyzed by mapping the generated irregular spiking ti...
Very Large Array observations of the 8 o'clock arc lens system: Radio emission and a limit on the star-formation rate
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2010/12/23
The 8 o'clock arc is a gravitationally lensed Lyman Break Galaxy (LBG) at redshift z=2.73 that has a star-formation rate (SFR) of 270 solar-mass/year (derived from optical and near-infrared spectrosco...
Biologists Discover How Biological Clock Controls Cell Division in Bacteria（图）
Biologists Biological Clock Cell Division Bacteria
2010/3/4
A team of biologists has unraveled the biochemistry of how bacteria so precisely time cell division, a key element in understanding how all organisms from bacteria to humans use their biological clock...
A new optical clock that is twice as accurate as any other has been unveiled by physicists in the US. The clock, which is based on a single aluminium ion, could remain accurate to within one second ov...
Micropower Digital Crystal Clock for Field Use
C-MOS Telemetering Seismology Crystal Clock
2009/6/18
Micropower Digital Crystal Clock for Field Use.
Clock synchronization by remote detection of correlated photon pairs
Clock synchronization remote detection correlated photon pairs
2010/4/9
We present an algorithm to detect the time and frequency difference of independent clocks based on observation of time-correlated photon pairs. This enables remote coincidence identification in entang...
On the Salecker-Wigner-Peres clock and double barrier tunneling
Salecker-Wigner-Peres clock double barrier tunneling
2010/4/7
In this work we revisit the Salecker-Wigner-Peres clock formalism and show that it can be directly applied to the phenomenon of tunneling. Then we apply this formalism to the determination of the tunn...
The CO2 tracer clock for the Tropical Tropopause Layer
CO2 tracer clock Tropical Tropopause Layer
2008/12/15
Observations of CO2 were made in the upper troposphere and lower stratosphere in the deep tropics in order to determine the patterns of large-scale vertical transport and age of air in the Tropical T...
摘要
生物钟基因普遍存在于生物界，其作用在于产生和控制昼夜节律的运转。生物钟基因及其编码的蛋白质组成反馈回路，维持振荡系统持续进行并与环境周期保持同步。各级进化水平物种生物钟的基因组成和控制途径有同有异。此文主要介绍蓝细菌、脉孢菌、果蝇、鼠和人昼夜钟的分子运作机制以及研究钟基因的意义和展望。
Abstract:The circadian clock genes,which generate ...
期刊信息
篇名
Synchronous derived clock and synthesis of low power sequential circuits
语种
英文
撰写或编译
作者
吴训威,Q.Wu
第一作者单位
刊物名称
J.of Electronics
页面
1999,Vol.16,No.2,138-145
出版日期
1999年
月
日
文章标识(ISSN)
相关项目
低功耗数字集成...
09 March 2007，People differ markedly in their response to sleep deprivation but biological markers of these differences have remained elusive. In findings published in this week's issue of Current Bio...
February 15, 2007，Years of comparisons among the world’s best atomic clocks—based on different atoms—have established the most precise limits ever achieved in the laboratory for detecting possible cha...
19 January 2007，The spectre of a nuclear war 60 years ago was what created the "doomsday clock," the Bulletin of the Atomic Scientists'(BAS) cold war chronometer. The closer the clock to midnight, the...