[en] The secondary-side passive emergency core residual heat removal system (ECRHR System) is an important part of AC-600 PWR passive safety system, with which the core decay heat can be removed through nature circulation in primary and secondary system. Since 1991, the program for AC-600 passive ECRHR system has been conducted to investigate its distinct thermal-hydraulic phenomena, heat removal capability, affecting factors, and to develop computer codes. The test facility, designed according to the power/volume simulating law, is a full pressure and temperature operating loop with volume scaling factor of 1/390. It is composed of main loop system, emergence feedwater system, depression system, heat tracing, I and C system and power supply system. A total of sixteen tests is planned in first stage and fifteen of them have been done. The preliminary result analysis showed that the system has efficient heat removal capability in most conditions and some special thermal hydraulic phenomena, for example, flow fluctuation, which has negative impact on system's nature circulation, were identified

[en] Detailed analysis is carried out to describe the non-uniform structure of sulfur doped monolayer for polystyrene hollow microscopy. The results demonstrate that the appearance of this non-uniform comes from PSS (sodium polystyrene sulfonate, the doped sulfur agent). The film forming capability of PSS is also investigated with infrared image microscopy and polarizing microscope. PSS has a bad performance in film forming, and the ordering aggregates and crystal appear on the surfaces of the film. There is great difference in the thermal properties between the PSS film and the polystyrene film indicated by thermal treatment, and the PSS film is easy to have brittle crack and strip from the polystyrene film. Therefore, PSS is not appropriate for fabricating the hollow microspheres when the content of doped sulfur is high. (authors)

[en] The secondary-side passive emergency core residual heat removal system (ECRHR System) test facility is a large scale passive safety system experimental test rig, which is designed base on the thermal-hydraulic simulating theory and criteria. On the design, some necessary simplifications are taken on condition that main thermal-hydraulic phenomena and process can be conserved. The loop systems, main components and design parameters and its design characters are presented. At last, the commissioning result, research program and experience gained are also introduced

[en] According to operation regulation, commissioning program and regulation of AC600 secondary-side passive emergency core residual heat removal system test facility, commissioning of the test facility was carried. Commissioning results show that design of the test facility is successful, experimental research of AC600 secondary-side passive emergency core residual heat removal system is capable of being carried

[en] An emulsion encapsulation method is applied to the fabrication of polymer capsules in inertial confinement fusion (ICF) experiments. Craters on the capsule surfaces make the capsules useless. This paper introduces the origins of the craters and focuses on ways to remove the craters from polymer capsules. Three origins are discussed and their influence can be restrained to reduce the cratering to meet the demand for mass production of targets. (author)

[en] Poly-(α-methylstyrene) (PAMS) microspheres were fabricated with W1/O/W2 double emulsion microencapsulation method, and the effects of polyvinylalcohol (PVA) and CaCl₂ weight concentrations and the O/W2 phase ratio on the percentages of defected PAMS microspheres were studied. The weight concentrations of PVA and CaCl₂ and the O/W2 phase ratio in the fabrication process of PAMS microspheres were optimized. The results show that, for the three parameters being 1.0%, 1.5%, and 0.01, respectively, the percentage of the defect-free PAMS microspheres without vacuoles in the shell wall can be up to 60%. (authors)

[en] Via measuring results of phase compatibility and interference effects between polystyrene (PS) and polyvinyl benzyl chloride (PVBCl), the influence on the phase separation status of the two substances in the cured film and shell from solution mixed with PS and PVBCl was studied using the infrared microscopic chemical image, and the phase separation of the two polymers of the microspheres obtained under different processing conditions was studied by the infrared microscopic chemical image. The results indicated that the established method can be used to analyze the phase separation of PS and PVBCl in the shell of microspheres by qualitative or semi-quantitative, and the large testing uncertainty caused by the interference effects in polymer microspheres, can be optimized at 40 ℃ because of the better phase separation of these two polymer substances. This study provides a method to investigate the conditions of preparation of heterogeneous dual hemispherical polymer, and to characterize the phase separation of polymer by infrared microscopic chemical image. However, this method affected by the spatial resolution is not suitable for the sample with size less than 6.25 μm × 6.25 μm. (authors)

[en] Low-density hydrophobic silica aerogels were produced by modification of conventional silica aerogels via substitution of -OH groups by trimethylsilyls. IR spectra and thermogravimeturic anglyses were to characterize the aerogels before and after modification, And the diameter changes of modified and unmodified aerogel micro cylinders were tracked using a measuring microscope. The results show that the hydrophobic silica aerogels possess much higher stability than hydrophilic ones due to the diminishment of -OH groups and the radial shrinkage ratio of cylinder samples decreases dramatically from 30% down to 3% after modification. (authors)

[en] In this paper, a study on the oriented thermal vapor deposition device which is used for coating microspheres with polyamic acid (PAA) is developed. Influences of the processing of monomer material and the adjusting of heating process on the deposition rate are discussed. Two different monomers are poured into two evaporators and evaporated independently, the deposition rate and film thickness are measured via two film thickness measuring probes with the crystal vibration. Space position and symmetry of sample pan, two probes and the oriented tube tip are adjusted so that two monomers' deposition ratio approximates to stoichiometric ratio. High quality coating of PAA on poly-alpha-methylstyrene microsphere is acquired by intermittent piezoelectricity vibration or striking which accompanies rotating of the sample pan. (authors)

[en] Thermal gravity analysis was applied to obtain the thermal pyrolysis behaviour of four kinds of poly (alpha-methylstyrene) of different average relative molecular mass. Experiments indicated that the pyrolysis temperature of poly (alpha-methylstyrene) covered 220 degree C to 340 degree C, and that of glow discharge polymer covered 350 degree C to 450 degree C. Degradation temperature kept fixed at the rate of 20 degree C/min and 30 degree C/min, and the temperature increased when the rate was no more than 20 degree C/min. (authors)