[en] The PWR reactor core commissioning programs the content of the first critical reactor physics experiment, and describes thc physical test method. However, all the methods arc not exactly the same but efficient. This article aims to enhance the reactor for the first time in the process of critical safety, shorten the overall time of critical physical test for the first time, and improve the integrity of critical physical test data for the first time and accuracy, eventually to improve the operation of the plant economic benefit adopting sectional dilution, power feedback for Doppler point improvement of physical test methods, and so on. (author)

[en] Using (106±4)x10⁶ ψ^' events collected with BESIII/BEPCII in March and April 2009, some χ_cJ decay modes are studied, such as χ_cJ→π⁰π⁰, χ_cJ→ηη, χ_cJ→VV, χ_cJ→γV, and so on. The precisions of these branching fraction measurements are improved, which is helpful to understand χ_cJ decay mechanism.

[en] The separation of the radioactive components in ⁹⁹Tc-HMDP-NaBH₄ label system both by anion exchange HPLC and ion pair HPLC is described. It is discovered that there are at least four different ⁹⁹Tc compounds or compounds with different valency. The radioactivity of the main peak reaches about 90% of total radioactivity

[en] Graphical abstract: The dielectric constant (ϵ) of the sintered BaO–B_2O_3–SiO_2/BaTiO_3 glass/ceramics (the sintered samples with line shrinkage of 10%) changed from 5 to 30 and the dielectric losses (tanδ) was lower than 0.05 at 100 MHz with the amount of BaTiO_3 additive increment from 60 wt% to 90 wt% fraction. - Highlights: • The ϵ of BaO–B_2O_3–SiO_2 glass can be adjusted from 5 to 30 by adding BaTiO_3. • The influence factors on dielectric are the secondary phase and microstructure. • BaO–B_2O_3–SiO_2/BaTiO_3 system can fabricate LTCC when BaTiO_3 located in 60–80 wt%. - Abstract: This paper studied the preparation and characterization of LTCC (low temperature co-fired ceramics) materials based on BaO–B_2O_3–SiO_2/BaTiO_3 glass–ceramics, where the sintering temperature was about 900 °C and dielectric constant was effectively adjustable from 5 to 30 by changing the BaTiO_3 fraction from 60 wt% to 90 wt%. X-ray diffractometer (XRD), scanning electron microscopy (SEM) were used to examine the effect of different amounts additive on the dielectric properties of this LTCC system and the crystal structure change. The results indicated that BaTiO_3 can be used as a dielectric additive aim to adjust the permittivity of BaO–B_2O_3–SiO_2 glass, which the main influence factors on dielectric are the contents of the secondary phase, the BaTiO_3 phase fraction and the porous structure of the sintered body. Therefore, the microstructure and dielectric property of BaO–B_2O_3–SiO_2/BaTiO_3 glass–ceramics composites could be controlled by adjusting the content of BaTiO_3 additive

[en] The constant hangers are usually used in nuclear power stations. Fitting relation is researched for the main-auxiliary constant hangers. The structure is designed based on the curve differential equation of cam after the analysis of the characteristics of the constant. The designed cam theoretically satisfies the work demand of the constant hangers, providing the direction for the optimization of the curve. (authors)

[en] We revisit the calculation of the width for the radiative decay of a 1"+"- heavy Q anti Q meson via the channel 1"+"- → 0"-"++γ in the covariant light-front quark model. We carry out the reduction of the light-front amplitude in the non-relativistic limit, explicitly computing the leading and next-to-leading order relativistic corrections. This shows the consistency of the light-front approach with the non-relativistic formula for this electric dipole transition. Furthermore, the theoretical uncertainty in the predicted width is studied as a function of the inputs for the heavy-quark mass and wave function structure parameter. We analyze the specific decays h_c(1P) → η_c(1S) + γ and h_b(1P) → η_b(1S) + γ. We compare our results with experimental data and with other theoretical predictions from calculations based on non-relativistic models and their extensions to include relativistic effects, finding reasonable agreement. (orig.)

[en] Highlights: • A simulation model is proposed to couple optical and heat transfer processes. • The air outlet temperature is 662 °C at a flux of 120 kW/m"2 experimentally. • The temperature deviations are within 8% between simulation and experiment. • The model indicates the air outlet temperature can reach 800 °C at 300 kW/m"2. • The model provides detailed analysis and suggests ways to improve performances. - Abstract: High temperature air is a potential candidate as a heat transfer fluid to transport energy from concentrated solar power to gas turbines. A 15-turn helically coiled tube cavity receiver with an optical splitter at the bottom is designed and fabricated. Its performance is investigated with a five 7-kW Xe-arc lamps array system as heat source. Eight K-type thermocouples are placed from top to bottom with an equal interval. The outlet temperature experimentally ranges from 593 °C to 546 °C when the air flow rate increases from 1 m"3/h to 5 m"3/h for up-flows, while it ranges from 662 °C to 570 °C for down-flows, when the average flux on aperture is around 120 kW/m"2. The Monte-Carlo ray-tracing method and the Lambert testing method with a charge-coupled device (CCD) camera are used to simulate and evaluate the concentrating radiation energy distribution on the cavity’s internal walls, and then the actual flux distribution of each turn of the helically coiled tube is obtained. A comprehensive simulation model is proposed and validated by the experimental results, where the outlet temperature deviations are within 8.0% and 2.5% for down and up-flows, respectively. The model provides a detailed analysis of heat flows at different conditions, and indicates optimization ways to improve the efficiency and reduce heat losses. The simulation results show that the outlet temperature can increase up to around 800 °C at 5 m"3/h under an average flux of 300 kW/m"2, and the thermal efficiency can be improved from around 56% to around 64% by decreasing the inner radius from 6 mm to 4 mm at the expense of increasing pressure drop of around 56 kPa

[en] Objective: To study the effects of helicase-like transcription factor (HLTF) transfection on DNA repair protein level in radiation-induced apoptotic cells. Methods: Human lung carcinoma A549 cells were cultured and transfected with FLAG-tagged wild type HLTF (wild type HLTF transfection group), RING structure domain (ubiquitin conjugating region) mutatation HLTF expressing plasmid (mutant transfection group), empty plasmid (control group) respectively. And the other cells were used as mock transfection group. All cells were irradiated with 15 Gy of ⁶⁰Co γ-rays to induce apoptosis. Western blotting was used to detect the protein levels of the DNA repair proteins HRAD17 and HRAD52 in the transfected cells. Results: The levels of HRAD17 and HRAD52 in the wild type HLTF transfection group was significantly lower than that of the control group. There was no significant difference in HRAD17 and HRAD52 levels between the mock transfection group and ubiquity in conjugating region mutation group. complexes of HLTF and HRAD17 and HRAD52 could be found in the irradiation-induced cells. Conclusions: HLTF mediates the degradation of HRAD17 and HRAD52 in the irradiation-induced apoptotic cells possibly by the interaction of the protein complex causing ubiquitination of the repair proteins. (authors)

[en] Highlights: • The Mg–Al–CO_3- and magnetic Fe_3O_4/Mg–Al–CO_3–LDH can efficiently remove Cd(II) from aqueous solutions. • The adsorption mechanisms of Cd(II) were discussed in detail. • The adsorption kinetic, isothermal and thermodynamic properties of Cd(II) were studied. • Magnetic Fe_3O_4/Mg–Al–CO_3–LDH can be quickly and easily separated using a magnet. - Abstract: Understanding the adsorption mechanisms of metal cations on the surfaces of solids is important for determining the fate of these metals in water and wastewater treatment. The adsorption kinetic, isothermal, thermodynamic and mechanistic properties of cadmium (Cd(II)) in an aqueous solution containing Mg–Al–CO_3- and magnetic Fe_3O_4/Mg–Al–CO_3-layered double hydroxide (LDH) were studied. The results demonstrated that the adsorption kinetic and isotherm data followed the pseudo-second-order model and the Langmuir equation, respectively. The adsorption process of Cd(II) was feasible, spontaneous and endothermic in nature. X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy were used to explain the adsorption mechanisms. The characteristic XRD peaks and FTIR bands of CdCO_3 emerged in the LDH spectra after Cd(II) adsorption, which indicated that the adsorption of Cd(II) by LDHs occurred mainly via CdCO_3 precipitation, surface adsorption and surface complexation. Furthermore, the magnetic Fe_3O_4/Mg–Al–CO_3-LDH can be quickly and easily separated using a magnet before and after the adsorption process.

[en] The vigorous development of silicon photonics makes a silicon-based light source essential for optoelectronics' integration. Bonding of III–V/Si hybrid laser has developed rapidly in the last ten years. In the tireless efforts of researchers, we are privileged to see these bonding methods, such as direct bonding, medium adhesive bonding and low temperature eutectic bonding. They have been developed and applied to the research and fabrication of III–V/Si hybrid lasers. Some research groups have made remarkable progress. Tanabe Katsuaki of Tokyo University successfully implemented a silicon-based InAs/GaAs quantum dot laser with direct bonding method in 2012. They have bonded the InAs/GaAs quantum dot laser to the silicon substrate and the silicon ridge waveguide, respectively. The threshold current of the device is as low as 200 A/cm². Stevan Stanković and Sui Shaoshuai successfully produced a variety of hybrid III–V/Si laser with the method of BCB bonding, respectively. BCB has high light transmittance and it can provide high bonding strength. Researchers of Tokyo University and Peking University have realized III–V/Si hybrid lasers with metal bonding method. We describe the progress in the fabrication of III–V/Si hybrid lasers with bonding methods by various research groups in recent years. The advantages and disadvantages of these methods are presented. We also introduce the progress of the growth of III–V epitaxial layer on silicon substrate, which is also a promising method to realize silicon-based light source. I hope that readers can have a general understanding of this field from this article and we can attract more researchers to focus on the study in this field. (paper)