[en] A center-of-mass (CM) bag model and its cavity approximation are suggested by introducing a phenomenological four-potential of confinement and the CM four-vector. This model, equivalent to the MIT version on the rest CM-frame, seems to provide a field-theory interpretation of our previous assumptions about the collective motion of bagged quarks and can be readily quantized. (orig.)

[en] Corrosion of the reduction vessel induced by molten LiCl-Li₂O is an important problem in the lithium reduction technique for the spent nuclear fuel management. This study investigates the corrosion of nickel in molten LiCl-10 wt% Li₂O at 750 deg. C by immersion experiments, with the aim of unraveling the corrosion behavior. Nickel corrodes very fast in the melt, forming a layer of NiO, which is converted to Li₂Ni₈O₁₀ and then to LiNiO₂. The weight loss curve shows a linear rate law, which is owing to the harmful reaction between oxides and melt at the melt/scale boundary with the formation of the porous corrosion scale. The corrosion mechanism of nickel is also discussed

[en] A simplified way to calculate the two-loop corrections to the renormalization group equations is investigated and applied to two SO(10) axion models. It is found that the grand unification mass scale M_x is reduced by a factor --1.5-3. And in both models, there exist solutions with M_x -- 10¹⁵ Gev, corresponding to a proton lifetime tau_rho→esup +/π^o / -- 10³²-10³³ yr, when sin² θ_w, α_s and α_e are chosen within the experimental error range

[en] By identifying the chiral fields and related operators in Gepner's models and Vafa's twisted N = 2 Landau-Ginzburg models, the authors find that they also have the same E₆ singlets spectra and therefore correspond to the same specific points of superstring vacua. This paper shows explicitly how to identify generations, anti-generations and the E₆ singlets in Vafa's class-A and E_τ models with Gepner's models

[en] We investigated the delivery of small cluster ions using a source of negative ions by cesium sputtering (SNICS). The negative cluster ions of B_n, C_n, Si_n, Co_n, Cu_n, Ge_n, Au_n, GeB_n and SiB_n have been extracted by SNICS. Adequate beam current of some small clusters was obtained by changing several parameters for cluster ion yield. After a comprehensive study of the operation parameters, such as target material selection, target geometry, sputtering voltage and current, the small cluster ion current can be increased by several orders of magnitude, with little change on the monomer ion yield

[en] We have observed a strong non-linear effect in copper cluster ions induced damage in silicon. Copper cluster ions Cu_n (n=1,2,...,7) were extracted from a source of negative ions by cesium sputtering. P-type silicon wafers were irradiated with copper cluster ions at an atomic dosage range of 8x10¹² to 1x10¹⁵ atoms/cm² at the energy of 6 keV/atom. The quantitative characterization of the cluster ion induced damage was performed by Rutherford backscattering spectrometry/channeling analysis. Comparison with analytical overlapping model shows very good agreement

[en] We observed as much as 50% more damage for Au-cluster ion implantation in Si as compared with that of the Au monomer in the energy range of 6 keV/atom. This is contrary to the literature where the linear damage result was reported. In this experiment, small gold clusters Au_n with n from 1 to 4 were used. Energy of 6 keV per Au atom was applied to bombard the Si single-crystal surface. The radiation damage was characterized by Rutherford backscattering spectrometry/channeling in the number of Si atom displacements per Au atom. We have also studied this non-linear effect in a wide range of fluences from 8x10¹² to 1.2x10¹⁵ Au-atoms/cm² and observed a fluence-dependent effect. At higher fluence, sputtering and overlapping of the damage will reduce the damage efficiency, therefore reducing the non-linear effect. This could be the reason that earlier publication did not observe the non-linear effect

[en] The effects of Ta on microstructure and mechanical property of Ti-Zr-Cu-Pd-Ta alloys without toxic element were investigated in this paper. The results revealed that with increasing Ta content, the glass-forming ability of examined alloys decreased. Nano-crystalline composites were obtained with 1% and 3% Ta addition. Higher strength and distinct plastic deformation comparing with Ti-Zr-Cu-Pd base alloy were achieved in 1% Ta-containing alloys due to the nano-particles existing in the glassy matrix which inhibit the deformation of shear bands. Dendrite enriched with Ta was also observed in the 5% Ta-containing alloy by SEM. No plastic deformation was observed for 3% and 5% Ta-containing alloys with the high volume fractions of crystallization over 50%. (author)

[en] Complete text of publication follows. The Meridian Space Weather Monitoring Project (Meridian Project) is the ground-based network program to monitor solar-terrestrial space environment. The first phase of meridian project has been begun to construct by Chinese government in Jan. 2008 and will be finished in Dec. 2010, which consists of a chain of 15 ground-based observatories with multiple instruments including magnetometers, ionosondes, HF and VHF radar, Lidar, IPS monitors, sounding rockets etc. These stations are mainly located at the neighborhood of 120degE meridian. The second phase of meridian project has been proposed. Its main object is to construct one three-dimensional solar-terrestrial space environment monitor system based on the space-ground network. For the space monitoring part, one satellite will be launched, whose orbital altitude is about 450km and the orbital inclination is 90 degrees (polar orbit). We suggest the scientific payloads should include the Langmuir probe, GPS occultation receiver, multiple wavelength gas glow radiation detector, magnet field detector, electrical field detector and so on. For the ground-based monitoring part, 15 stations have been built in the first phase of meridian project, where 10 stations are located along 120degE and 4 stations are along 30degN. So, in the second phase, the monitoring stations will been expanded to 100degE and 40degN. The added stations will be located in Kashi, Ge'ermu, Jiayuguan, Yinchuan, Huhehaote, Jinghai, Shenyang, Yushu, Chayu, Xichang and so on. Finally, One '//' shape ground-based monitoring system will be achieved. After the second phase of meridian project is done, it is built one three-dimensional monitoring network with high density covering ground stations and synchronous observation between ground station and spatial satellite, and it will play a greater role in monitoring solar-terrestrial space environment. Acknowledgement: the project is supported by Chinese government. The authors thank the members participating in the construction of the meridian project for their work. We especially thank manager of meridian project and the leader of the Center of Space Science and Applied Research, CAS for their proposal. At the same time, we are very glad to receive from your advice and proposals for the second phase of meridian project.

[en] The ¹⁰B(α, p)¹³C nuclear reaction shows great potential in boron depth profiling due to its large cross-section and a narrow resonance in the MeV energy range. Unfortunately, the existing cross-section data on this reaction are too rough for depth profiling. We present an accurate measurement of the cross-section of the (α, p) reaction on ¹⁰B using a boron thin film on a Si substrate, high-resolution detection and careful analysis of the proton spectra. Angular distributions of the cross-section at the resonant energy E_r=1512 keV are also presented. The sharp resonance at 1512 keV was used to measure the B depth distribution in a borophosphosilicate glass (BPSG) thin film. The boron concentration profiles are compared with SIMS measurement and are found in good agreement