A one to one complex is formed between Eu(III) and alanine in water, with the log of the complexation constant=−0.48±0.08 at 25 °C and an ionic strength of 1.0 in perchlorate media.
Laser cycling of resonances can remove entropy from a system via spontaneously emitted photons, with electronic resonances providing the fastest cooling timescales because of their rapid relaxation ...rates. Although atoms are routinely laser cooled, even simple molecules pose two interrelated challenges for cooling: every populated rotational-vibrational state requires a different laser frequency, and electronic relaxation generally excites vibrations. Here, we cool trapped AlH+ molecules to their ground rotational-vibrational quantum state using an electronically-exciting broadband laser to simultaneously drive cooling resonances from many different rotational levels. Undesired vibrational excitation is avoided because of vibrational-electronic decoupling in AlH+. We demonstrate rotational cooling on the 140(20) ms timescale from room temperature to 3.8(+0.9/-0.3) K, with the ground state population increasing from ~3% to 95.4(+1.3/-2.0) %. This cooling technique could be applied to several other neutral and charged molecular species useful for quantum information processing, ultracold chemistry applications, and precision tests of fundamental symmetries.
The Astrophysical Journal, 2021, 918, 85 We present the results of simultaneous 450 $\mu$m and 850 $\mu$m polarization
observations toward the massive star forming region NGC 2071IR, a target of the
...BISTRO (B-fields in Star-Forming Region Observations) Survey, using the POL-2
polarimeter and SCUBA-2 camera mounted on the James Clerk Maxwell Telescope. We
find a pinched magnetic field morphology in the central dense core region,
which could be due to a rotating toroidal disk-like structure and a bipolar
outflow originating from the central young stellar object, IRS 3. Using the
modified Davis-Chandrasekhar-Fermi method, we obtain a plane-of-sky magnetic
field strength of 563$\pm$421 $\mu$G in the central $\sim$0.12 pc region from
850 $\mu$m polarization data. The corresponding magnetic energy density of
2.04$\times$10$^{-8}$ erg cm$^{-3}$ is comparable to the turbulent and
gravitational energy densities in the region. We find that the magnetic field
direction is very well aligned with the whole of the IRS 3 bipolar outflow
structure. We find that the median value of polarization fractions, 3.0 \%, at
450 $\mu$m in the central 3 arcminute region, which is larger than the median
value of 1.2 \% at 850 $\mu$m. The trend could be due to the better alignment
of warmer dust in the strong radiation environment. We also find that
polarization fractions decrease with intensity at both wavelengths, with
slopes, determined by fitting a Rician noise model, of $0.59 \pm 0.03$ at 450
$\mu$m and $0.36 \pm 0.04$ at 850 $\mu$m, respectively. We think that the
shallow slope at 850 $\mu$m is due to grain alignment at the center being
assisted by strong radiation from the central young stellar objects.
MoonWalker: Verification of .NET Programs Aan de Brugh, Niels H. M.; Nguyen, Viet Yen; Ruys, Theo C.
Tools and Algorithms for the Construction and Analysis of Systems
Book Chapter
Recenzirano
Odprti dostop
MoonWalker is a software model checker for cil bytecode programs, which is able to detect deadlocks and assertion violations in cil assemblies, better known as Microsoft .NET programs. The design of ...MoonWalker is inspired by the Java PathFinder (jpf), a model checker for Java programs. The performance of MoonWalker is on par with jpf. This paper presents the new version of MoonWalker and discusses its most important features.
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