(Quasi 3D) Numerical simulation of operation of a capacitive type nanoparticle counter

Operation of a nanoparticle counter is based on condensation of water on nanoparticles forming water droplets which are fed to a capacitive type detector. Impaction of a water droplet onto the water filled detector causes formation of a crater resulting in change of capacitance that is measured by associated electronics. Numerical simulation of electric field distribution during droplet impaction has been performed in order to analyze the suitability of the approach and to estimate the magnitude of change of detector capacitance during droplet impaction. A single impinging droplet is able to cause capacitance change in the femtofarad range.     

The structure of the excited states in84Rb

Conclusion On the basis of the simple shell-model the anomalously high admixture of the E4-radiation to the M3-transition deexciting the isomeric state^84mRb has been explained. The exact evaluation of the amount of this admixture would require, however, detailed theoretical calculations considerating the configuration mixing in the wave functions of the 3⁺ and 6⁺ states in⁸⁴Rb.     

The existence of (n, γf) process on235U nucleus and uranium X-ray yields

The measurement of X-rays emitted before the fission of²³⁵U induced by resonance neutrons is described. Preliminary results show the dependence of the X-ray yield on fission width _f. It is explained on the bases of the existence of the two-step (n,f) process. The estimate of the width of the (n,f) process is of the order of 4 MeV and the-transitions taking place before fission of²³⁶U compound nucleus are mostly of the M1 type.In conclusion the authors would like to express their gratitude to L. B.Pikelner for many useful discussions, to I. M.Salamattn and A.Mateeva for the programme supply of the experiment, V. G.Tisin, A. A.Bogdzel, Yu. I.Kolgin and N.Chikov for taking part in the different steps of the work. The authors are also grateful toYu. P.Popov and I.Wilhelm for taking interest in the work.     

Thermal properties of akaganéite (β-FeOOH)

A method is described for the preparation and thermal investigation of akaganéite (-FeOOH). Its thermal properties were investigated by means of a derivatograph. The thermal stability was studied during its heating in the air and also in aqueous suspension. At a characteristic temperature the akaganéite is converted to hematite.     

Observation of X(3872)→J/ψγ and search for X(3872)→ψ'γ in B decays

We report a study of B→(J/ψγ)K and B→(ψ'γ)K decay modes using 772×10? B ?B events collected at the Υ(4S) resonance with the Belle detector at the KEKB energy-asymmetric e(+)e(-) collider. We observe X(3872)→J/ψγ and report the first evidence for χ(c2)→J/ψγ in B→(X_{c ?cγ)K decays, while in a search for X(3872)→ψ'γ no significant signal is found. We measure the branching fractions, B(B(±)→X(3872)K(±))B(X(3872)→J/ψγ)=(1.78(-0.44)(+0.48)±0.12)×10(-6), B(B(±)→χ(c2)K(±))=(1.11(-0.34)(+0.36)±0.09)×10(-5), B(B(±)→X(3872)K(±))B(X(3872)→ψ'γ)<3.45×10? (upper limit at 90% C.L.), and also provide upper limits for other searches.     

Asymmetric Organocatalysis Under Mechanochemical Conditions

Asymmetric organocatalysis is a robust methodology providing access to numerous valuable compounds while having green chemistry principles in mind. The realization of organocatalytic transformation under solvent-free mechanochemical conditions brings additional benefits in terms of yields, selectivities, and, last but not least overall improved sustainability. This overview describes developments in the use of mechanochemistry as a vehicle for asymmetric organocatalytic transformations. The material is organized according to main catalytic activation modes, starting with covalent activation and proceeding to non-covalent activation modes. The advantages of mechanochemical organocatalytic reactions are particularly highlighted, but in some cases also, limitations are mentioned. Possibilities for target compound synthesis are also discussed.