[en] In the dielectric continuum approximation, we study the effect of different styles of coupling on the localized interface optical-phonon modes in two coupled semi-infinite N-constituent superlattices with a structural defect layer. The defect layer is composed of frequency-dependent or frequency-independent dielectric medium. The influence of the material and structural parameters of the defect layer on the localized interface optical-phonon modes is investigated in detail. Our results show that the localized modes exhibit peculiar characteristics in multi-constituent superlattices with a defect layer, substantially different from those of the conventional dual-constituent sample. A simple physical picture is presented to explain these results

[en] The strength functions of the isoscalar giant resonance monopole resonance and giant quadrupole resonance in ⁴⁰Ca are calculated by coupling the 1p--1h states to 2p--2h states. The results can explain the recent experimental data

[en] In this paper a steady state mathematical model is proposed to identify two-phase flow patterns. Model calculation results are compared with recorded flow pattern maps and data with satisfactory results. The method can be extended to wider parameter ranges and various duct contours as well as unsteady or transient conditions. ((orig.))

[en] Highlights: • Ni/Ag/Ni/Au p-type contacts with first Ni layer of 0.5 nm were investigated. • A pre-annealed ITO film scheme was proposed to decrease the contact resistance. • Flip-chip LEDs fabricated with the proposed scheme showed better performance. - Abstract: In this study, a Ni/Ag/Ni/Au multilayer with first Ni layer of 0.5 nm was first optimized for high reflectivity (92.3%), low specific contact resistance (2.1 × 10"−"3 Ω cm"2) and good attachment strength to p-type GaN. To further decrease the contact resistance, the p-type GaN surface was previously treated with pre-annealed indium-tin-oxide (ITO) film before deposition of the Ni/Ag/Ni/Au multilayer, and resulted in a lower specific contact resistance of 1.9 × 10"−"4 Ω cm"2. The X-ray photoelectron spectroscopy results indicated that Ga 2p core level of the p-type GaN surface with the pre-annealed ITO film had a lower binding energy, leading to a reduction in the contact resistance. Furthermore, GaN-based flip-chip light-emitting diodes (LEDs) with and without the pre-annealed ITO film were fabricated. The average forward voltage of the flip-chip LEDs fabricated with the pre-annealed ITO film is 3.22 V at an injection current density of 35 A/cm"2, which is much lower than that (3.49 V) of flip-chip LEDs without the pre-annealed ITO film. These results reveal that the proposed approach is effectively to fabricate high quality p-type contacts toward high power GaN-based LEDs.

[en] 3D visualization plays an important role in industrial CT inspection system.Taking 3D-imaging methods in other fields as references, the paper introduces three feasible imaging algorithms, contour connecting method, marching cubes (MC), and an improved marching cubes method basing on distance function. Compare of these methods are also given in this paper. It is of importance for the development of 3D visualization in air container and luggage CT inspection systems. (authors)

[en] In the research field of 3D visualization in luggage and container CT inspection systems, there was a bottleneck that objects were complicated and with no prior information, which leaded to 3D visualization not widely used in the area. The paper proposed a human-computer interaction implement process, basing on Marching Cubes algorithm, and schemed out an automatic threshold detection flow to solve lack-prior-information problem. It obtained satisfied effect and maneuverability as applied in real luggage and container CT inspection systems. The design provided in the paper will play an important role in the development of 3D visualization in luggage and container CT inspection systems with. (authors)

[en] Based on a description of the physical Δ-isobar as a dynamic πN system, a realistic force model for the two-nucleon system including Δ- and π-degrees of freedom is constructed. Applications to NN and πd scattering, and to the three-nucleon bound state are discussed. (orig.)

[en] The influence of an inert gas bubble inside EJ301 cylindrical cell on the response of the liquid scintillation detector to γ-rays and neutrons has been investigated. It is found experimentally that the response of the detector to radiation varies with the detector placement styles. The explanation proposed in this article is that this variation arises from the change of the light transmission process induced by the motion of the inner gas bubble. This assertion has been supported by the simulations of both radiation energy deposition and light transmission process inside the detector with the GEANT4 code. For the recommended detector placement style when the detector is placed horizontally, the variation of the response is smaller than 1.56%, which will increase to about 22% when the detector is placed facing down and the bubble lies between the scintillator and photomultiplier tube. -- Highlights: • Influence of an inner gas bubble on the response of EJ301 detector is investigated. • Energy deposition and light transmission process has been simulated with the Geant4 toolkit. • Best detector placement style has been determined for neutron energy spectrum measurement

[en] The design and technique of Data Acquisition System (DAS) in spiral CT is proposed in this paper, based on the real-time service and large amount of data. The DAS has double CPUs. One CPU is used to transfer data from preamplifier to FIFO, using Direct Memory Access (DMA). And the other runs for delivering data to main control station by wireless network. This design has been applied in the real industrial CT. (authors)

[en] A double antibody radioimmunoassay (RIA) was developed to measure cardiac troponin-I (CTnI) in serum. CTnI from fresh human myocardium was purified and identified. Antisera against CTnI were raised in NZ rabbits with affinity constant (Ka) 4.1 x 10^-10 L/mol. Iodination of CTnI was carried out with iodogen. The specific activity of the product was 3659 GBq/g. The ED₄₀ was 6.4 +- 0.34 μg/L (x-bar +- s, n = 8) from standard curves. The sensitivity was 1.5 μg/L and the assay covered the range 2∼64μg/L for CTnI. The intra-assay and inter-assay coefficient of variation (CV) were 2.1%∼5.7% (n = 8) and 5.4%∼9.9% (n = 4) respectively. The assay recovery was 90.1%∼95.3%. Non-immunochemical cross reactivity with skeletal troponin-I(STnI) was observed. The normal value was 2.17 +- 0.66 μg/L (x-bar +-s) in sera of 87 normal persons