We have reported on the results of analysis of the operating time of conventional laser diodes and diodes with noninjecting output sections. The reasons for shorter operating time of diodes with a ...single anti-reflection face of the cavity compared to diodes with two protecting coatings and emitters equipped with a fiber Bragg grating have been considered.
With the ever-increasing volume of applications of various kinds of electric drives in all spheres of human activity, the issues in improving the efficiency of the electromechanical converters of ...electric energy, one of the most important components of the electric drive (ED), are becoming increasingly important. Such issues include reducing their weight and size, improving the functional characteristics of these devices to increase their operational life and reducing the cost of manufacture. Taking full advantage of these opportunities relates to the AC and DC single-phase commutator motor (SCM), which is widely used in regulated and high-speed motor drives in medical electric hand tools. The SCM is used in machinery where the load torque has a hyperbolic dependence on the rotational speed and the need to work with a large motor overload due to the “soft” mechanical characteristics of such motors.
We construct a model that allows us to determine the three neutrino masses and the mass matrix directly from the experimental mass squared differences Δatm and Δsol, anticipating rational hierarchy ...(μm1/m2=m2/m3),μ≈1, and S3–S2 symmetry for the mixing matrix. We find that both the mass ratios and mixing angles are dominated by a parameter Λ. For the mixing angles, Λ=1/6≈0.41, is a Clebsch–Gordan coefficient. For the masses, the mass ratios depend on the experimental Δatm and Δsol and with most recent data, remarkably, we also obtain m1/m2=m2/m3=0.41=Λ. This possibly coincidental equality gives a simple mass matrix in the sin(θ13)=0 limit. We find that with Δsol=8.2×10−5 eV2, m1=1.5×10−3 eV, m2=9.2×10−3 eV and m3=5.3(5.5)×10−2 eV for Δatm=2.73(2.95)×10−3 eV2. We obtain the mass matrix M and evaluate it's elements numerically for the presently ‘best fit’ solution in the allowed range for sin(θ13). We find that all matrix elements are smaller than 0.03 eV. The only candidates for double texture zeroes are Mee and Meτ or Meμ (with θ13→−θ13). The maximum effective mass for neutrinoless ββ decay is |mββ|max≈8×10−3 eV.
Optimal opacification of the small bowel is important in the interpretation of abdominal CT. Two contrast agents, a barium suspension and an iodinated, water-soluble material, were evaluated in a ...blind prospective study of 54 patients. A grading system of small bowel opacification was developed. There was no significant difference between the two agents in opacification of the small bowel.
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