157 research outputs found
Dimerization of MLL fusion proteins and FLT3 activation synergize to induce multiple-lineage leukemogenesis
All-optical link for direct comparison of distant optical clocks
We developed an all-optical link system for making remote comparisons of two
distant ultra-stable optical clocks. An optical carrier transfer system based
on a fiber interferometer was employed to compensate the phase noise
accumulated during the propagation through a fiber link. Transfer stabilities
of at 1 second and at 1000 seconds were
achieved in a 90-km link. An active polarization control system was
additionally introduced to maintain the transmitted light in an adequate
polarization, and consequently, a stable and reliable comparison was
accomplished. The instabilities of the all-optical link system, including those
of the erbium doped fiber amplifiers (EDFAs) which are free from phase-noise
compensation, were below at 1 second and at
1000 seconds. The system was available for the direct comparison of two distant
Sr lattice clocks via an urban fiber link of 60 km. This technique will
be essential for the measuring the reproducibility of optical frequency
standards
Stability Transfer between Two Clock Lasers Operating at Different Wavelengths for Absolute Frequency Measurement of Clock Transition in 87Sr
We demonstrated transferring the stability of one highly stable clock laser
operating at 729 nm to another less stable laser operating at 698 nm. The two
different wavelengths were bridged using an optical frequency comb. The
improved stability of the clock laser at 698 nm enabled us to evaluate the
systematic frequency shifts of the Sr optical lattice clock with shorter
averaging time. We determined the absolute frequency of the clock transition
1S0 - 3P0 in 87Sr to be 429 228 004 229 873.9 (1.4) Hz referenced to the SI
second on the geoid via International Atomic Time (TAI)
Representation Theorem and Greenʼs Function (2) : Moment Tensor Representation of Volume Sources
Study on development policy for new cryogenic structural material for superconducting magnet of fusion reactor
A fusion DEMO will require large-scale cryogenic structure including TF coil cases. Because of huge electromagnetic forces, extra thick plates and/or wrought products will be supplied. Since the midsection of the huge block is weaker than the block surface region, the design yield stress must be determined taking account of this lower strength part. To search the manufacturing process to improve the midsection strength, the crystal refinement strengthening and the precipitation strengthening are considered together with the carbon and nitrogen solid solution strengthening. XM-19 was focused based on the variation of the yield stress and the fracture toughness, a 100 mm thick block and a 30 mm thick plate were trial produced, and strength and the fracture toughness at the midsection were evaluated. This study will present the experimental data and discuss the development policy for a new cryogenic structural material for a fusion reactor
TCT-611 Impact of Post-Stent Fractional Flow Reserve on Long-Term Adverse Event After Drug-Eluting Stent Implantation
Real-time observation of X-ray-induced intramolecular and interatomic electronic decay in CH2I2
Transition density of diffusion on Sierpinski gasket and extension of Flory's formula
Some problems related to the transition density u(t,x) of the diffusion on
the Sierpinski gasket are considerd, based on recent rigorous results and
detailed numerical calculations. The main contents are an extension of Flory's
formula for the end-to-end distance exponent of self-avoiding walks on the
fractal spaces, and an evidence of the oscillatory behavior of u(t,x) on the
Sierpinski gasket.Comment: 11 pages, REVTEX, 2 postscript figure
Direct Comparison of Distant Optical Lattice Clocks at the Uncertainty
Fiber-based remote comparison of Sr lattice clocks in 24 km distant
laboratories is demonstrated. The instability of the comparison reaches
over an averaging time of 1000 s, which is two orders of
magnitude shorter than that of conventional satellite links and is limited by
the instabilities of the optical clocks. By correcting the systematic shifts
that are predominated by the differential gravitational redshift, the residual
fractional difference is found to be , confirming
the coincidence between the two clocks. The accurate and speedy comparison of
distant optical clocks paves the way for a future optical redefinition of the
second
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