[en] Highlights: • We fabricate a low adhesive superhydrophobic nano Cu/Al_2O_3 composited Ni–Cr coating via brush plating. • We investigate the influence of process parameters on hydrophobic properties process. • We discuss the formation mechanism of structures on the surface and using water rebound height to explain the low adhesive force mechanism. - Abstract: Superhydrophobic nano Cu/Al_2O_3 Ni–Cr composited coating with a low adhesive force was deposited onto the Q345 carbon steel via electro-brush plating. Surface morphologies of nano Cu/Al_2O_3 Ni–Cr composited coating were investigated by scanning electron microscope (SEM). Chemical compositions were characterized by energy dispersive spectroscopy (EDS). First of all, by adjusting different process parameters such as working voltage, relative velocity, Cu particles concentration and plating time, we obtain the most optimal parameters: working voltage is 15 V, relative velocity is 4.8 m/min, Cu particles concentration is 5 g/L and plating time is 60 s. Under the best process parameters, the water contact angle reaches to 156° and a sliding angle is less than 2° on the nano Cu/Al_2O_3 Ni–Cr coating. Then the mechanism of the superhydrophobic and low adhesion characteristic of this surface were explained by Cassie's model. Low adhesive force can be characterized by max rebound height of water droplet. As a result, to achieve low adhesive surface it is necessary to decrease the fraction of the solid/liquid interface under the water droplet. Finally the coating was proved to have an excellent self-cleaning performance.

[en] We have performed an experimental study of the α-fragments emitted from collisions between emulsion nuclei and heavy-ion projectiles at beam energies beyond 1 A GeV. It is shown that the transverse momentum distributions of relativistic α-particles give evidence for emission at two effective temperatures in high-energy heavy-ion collisions. The data might take on a new signature for the phase transition from hadron matter to quark matter

[en] The F-spin was introduced to distinguish two kind bosons in IBM-2 in which a distinction is made between neutron and proton. It turns out to be a satisfactory quantum number to label the IBM-states in which neutron and proton bosons are mixed. Generally the IBM-2 Hamiltonian is not symmetric in F-spin space. In order to discuss the effects of F-spin breaking part quantitatively the authors explicitly write the Hamiltonian in two parts. The model is applied in Gd isotopes (Z=64, 90 ≤ N ≤ 94). The authors present the results of calculations of energy spectra. Nearly all bands have their experimental counterparts. The results show that the F-spin breaking part improves the agreement between the theoretical and the experimental values of bands which band head energies are relatively higher and that it has little effect on bands which band head energies are lower

[en] Short communications only

[en] An overview of experimental status of the international collaboration on ultra-high energy induced nuclear reactions and the relative heavy-ion physics is given. It includes: 1. theoretical predictions of quark matter (quark-gluon plasma), 2. the experiments of ultra-high energy heavy-ion collisions: (1) the BNL/AGS fixed target experiments, (2) the CERN/SPS fixed target experiments, (3) the BNL/RHIC colliding experiments, (4) the CERN/LHC colliding experiments

[en] Three new nuclear emulsion techniques used for measuring emission angles of charged particles in central events at ultra-high energy heavy-ion collisions are fully described

[en] When the behaviour of main pump in PWR power plant change, as a result of arresting fluid countercurrent current by check valve, water hammer phenomena met occur more or less in loop. Serious water hammer not only met brought incident of over pressure, imperil pressure boundary, but also may engender check valve lapse. DC check valve is a kind of new theory check valve, is designed to avoid serious water hammer phenomena at tradition check valve closing, the analyses and experiment indicate that DC check valve can availably solve water hammer problem in the loop, and be able to reliably prevent fluid countercurrent. (authors)

[en] Electron backbom and the beam qualities of the RF-gun in the real conditions is investigated by means of particles simulations. The influences of the cavity length and amplitude of electric field are presented. And the methods decreasing the power of backbom are discussed

[en] Free Electron Lasers (FELs) require very good quality electron beam source. A low emittance is necessary to obtain short wavelength. A high peak current provides a high gain. A high-gradient, S-band, 1+1/2 cell microwave gun (i.e. RF gun) with a LaB₆ thermionic is being developed. The design principle, fabrication and testing of the RF gun are described. The RF gun had been firstly tested and produced electron beam in Dec . 1992. After one year of the testing and operating, beam emittance and electron energy spread are also measured. These results are very satisfactory. When input microwave power in to the RF gun is about 1.1 MW, the main parameters of the RF gun are following: maximum electron energy is 1 MeV, average electron energy is about 0.6 MeV, routine macro-pulse current is 1 A, maximum macro-pulse current is 1.67 A, macro-pulse-width is 2μs, microwave frequency is 2997.75 MHz, repetition rate is 50 Hz, electron beam normalized emittance is 5πmm·mrad

[en] Close coupling equation was applied to the calculation of the differential cross sections for He-H₂ (D₂, T₂) collisions (E=0.2 eV), in elastic and inelastic case