[en] AP1000 is an important one of the third generation of nuclear reactors. Its subtraction design concept has significant differences with existing nuclear reactors, so we need to do further research. This paper introduces the characteristics of the radiation monitoring system of AP1000 firstly, then compares with CPR1000's radiation monitoring system in the test evaluation, standard system, security classification, functional classification and other aspects, then analysis the differences. It can conclude that the AP1000's design has improvements to CPR1000's, increasing the security and the stability of radiation monitoring system. (authors)

[en] Purpose: To evaluate the diagnostic value of contrast-enhanced MRI for benign and malignant breast lesions. Methods: 48 patients were scanned by conventional MRI and contrast-enhanced MRI, all cases had of X-ray, B-ultrasound, surgery and pathologic examinations. The authors analysed some characteristics of benign and malignant lesions after administration of Gd-DTPA, such as, shape, border, signal intensity, degree of enhancement, speed of enhancement and washout, and so on. Results: Correct diagnostic rate of 81 lesions in 48 patients with breast diseases for benign and malignant was 92.6%. Conclusion: Contrast-enhanced MRI is a new effective medical imaging method for differentiating benign and malignant breast lesions

[en] A fault diagnostic Bayesian network of reactor make-up system was constituted. The system's structure characters, operation rules and experts' experience were combined and an initial net was built. As the fault date sets were learned with the particle swarm optimization based Bayesian network structure, the structure of diagnostic net was completed and used to inference case. The built net can analyze diagnostic probability of every node in the net and afford assistant decision to fault diagnosis. (authors)

[en] Among many factors influencing radiation fields at primary loop of nuclear power plants, two main aspects are the materials of system equipment and the chemical parameters of primary loop water. The effects of dissolution H₂, boron potassium coordination curve control, technology for Zn injection, and reactor shutdown oxidation operation on radiation sources are discussed in this paper. Relevant advices are provided. (authors)

[en] The Bayesian fault diagnosis networks of heat removal pump were built based on its fault tree. As the basic conversion method of FT/BN was shown, the expression of multi-formed logic and condition probability table of non-determinism was analyzed. The root nodes' probability was gain by the subsection voting with specialists. The node significance, sensitivity analysis and bidirectional diagnoses provide decision for equipment in designing, using and maintaining. (authors)

[en] The water chemical control of the main loop is an important part of the radiation source term control for PWR. This paper deeply analyzes the principle and influence of the dissolved H₂, the technology of injection zinc, boron and lithium (potassium and boron) coordination curve and the technology oxidation for shut down, etc, for the radiation source terms, it is finally put forward that the suggestions of the water chemistry optimization. (authors)

[en] Due to the local densification, high-energy C and doped ions can greatly affect the bonding configurations of diamond-like carbon films. We investigate the corresponding affection of different incident ions with energy from 10 eV to 600 eV by Monte Carlo methods. The ion-implanted mechanism called the subplantation (for C, N, O, W, Y, etc.) is confirmed. Obvious thermal effect could be induced by the subplantation of the incident ions. Further, the subplantation of C ions is proved by in situ reflection high energy electron diffraction (RHEED). The observation from an atomic force microscope (AFM) indicates that the initial implantation of C ions might result in the final primitive-cell-like morphology of the smooth film (in an area of 1.2 mm × 0.9 mm, rms roughness smaller than 20 nm by Wyko). (authors)

[en] Amorphous hydrogenated carbon films were prepared by pulsed laser deposition (PLD) and the effect of the hydrogen pressure upon the performance of the films was studied. The AFM and Wyko images of the film show that the surfaces of the films are smooth and compact and that as the hydrogen pressure increases, the roughness becomes higher. The Raman spectra of the films were analyzed and it shows that the G peak and D peak approach to higher wave numbers as the hydrogen pressure increases. Fouorier transform infrared spectroscopy indicates that there exist sp³-CH₃ and sp²-CH clusters in the film. With floating method of PLD, self-supporting CH films with different thickness (100 ∼ 300 nm) were synthesized. (authors)

[en] The current-voltage characteristic of hydrogen plasmas induced by helicon waves was measured in situ by a Langmuir probe under low pressure. According to Druyvesteyn method, raw data were fitted by an exponential transformation to a tangent hyperbolic function. Electron density, effective electron temperature and electron energy probability function (EEPF) were calculated from the fitted curves. The variation law of electron density, effective electron temperature and EEPF was analyzed in relation to different experimental parameters. The results demonstrate that RF power, gas pressure and controlled magnetic field relation to different experimental parameters. The results demonstrate the RF power, gas pressure and controlled magnetic field have significant effects on state parameters of plasma. Electron density jumps with the increase of RF power because of the transition of mode, and it increases linearly with controlled magnetic field. With the increase of gas pressure, a peak is observed in the variation of electron density at 1.5 Pa. Effective electron temperature decreases with the rise of RF power and pressure, With the enhanced magnetic field, effective electron temperature descents linearly. Both peaks and higher energy parts of EEPF curves move toward lower energy. (authors)

[en] Highlights: • Thermal behaviour of wheat straw, camphorwood, coal slime and its blends were studied. • The effects of co-combustion on NO and SO₂ emissions were investigated. • Co-combustion with biomass improved the combustion performance of the blends. • Notable interactions were found during the co-combustion process. • Addition of biomass could reduce the emission of NO and SO₂ from coal slime. The disposal of coal slime has attracted increasing attention due to its increasing production and consequent environmental pollution. The co-combustion with biomass is a promising method for the treatment of coal slime. However, there are only a few studies on coal slime and biomass co-combustion. This study investigated the co-combustion characteristics and gaseous pollutant emissions of coal slime with camphor wood and wheat straw. The results showed that there are significant interactions between biomass and coal slime during the co-combustion process. The addition of biomass reduced the ignition and burnout temperature and enhanced the combustion stability of the blends. Meanwhile, the addition of biomass inhibited the emission of NO and SO₂ from the blends. Moreover, the kinetic analysis showed that the activation energies of biomass char and coal slime combustion stage decreased with increasing biomass content, indicating that biomass's addition improved the combustion reactivity of the blended fuel. The results provide basic knowledge regarding the thermal behaviour and emission characteristics of coal slime and biomass co-combustion. It was established that co-firing is beneficial for the clean and efficient utilisation of coal slime.