Results 1 - 10 of 57
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[en] In the process of nuclear radiation measurement, often the results relied on measuring the temperature and humidity of the environment to compensate. The design of a low-cost simple temperature and humidity logger in the article, can achieve the measurements of temperature, humidity in the experimental nuclear environment. The system uses AT89 series low-cost MCU controller, domestic DHT11 temperature and humidity sensors, and RS485 protocol for remote data transfer and on-line monitoring of results. Experimental results show that the collector can achieve rapid multi-point measurements of temperature and humidity, the system is stable and reliable, is a low-cost solution, suitable for all kinds of nuclear measurement applications. (authors)
[en] Article introduced a portable tube exciting X-ray fluorescence analysis system which is based on arm architecture. Also, we designed Tube control circuit and finished preliminary application. The energy and the intensity of the photon can be adjusted continuously by using the tube. Experiments show that high excitation efficiency obtained by setting the appropriate parameters of the tube for the various elements. (authors)
[en] Graphical abstract: There had a critical F_m_a_x to measure adhesion force between the diamond indenter and the FS, and it was about 20 mN. And variation of measured adhesion force with F_m_a_x could be fitted linearly when the latter was higher than its critical value, with slope −1.8615 μN/mN. - Highlights: • Nano-indentation was adopted to study microscopic interactions in polishing process. • Measured contact force changed little when F_m_a_x was less than its critical value. • Intrinsic mechanisms of variations of contact force was due to elastic recovery. - Abstract: Nano-indentation method was brought forward to replace atomic force microscopy (AFM) in simulating microscopic interactions between abrasive particles and material surfaces during polishing process. And main influencing factors including measuring parameters and material's properties were investigated thoroughly. It was found that contact force between the diamond indenter and a fused silica was about 200 μN, while it was about 470 μN between the indenter and an austenitic steel, and in both cases it did not vary with the maximal indentation force (F_m_a_x) and the corresponding loading rate. While adhesion force between the indenter and surfaces of the two materials did not change with F_m_a_x when the latter was less than its critical value, while it decreased monotonously with increased F_m_a_x when the latter was higher than its critical value, with slope −1.8615 for the fused silica and −1.5403 for the austenitic steel, and the critical F_m_a_x was about 20 mN for the fused silica and about 50 mN for the austenitic steel. According to analysis on elastic and plastic deformation during loading process and elastic recovery during unloading process, it was deduced that there would produce marked elastic recovery force when the unloading rate determined by F_m_a_x was higher, which counteracted the measured adhesion force to some extent and made it less than its corresponding intrinsic value. And material's elasticity had an additional impact. Then it is better to adopt maximal indentation forces less than critical values of materials, to obtain accurate adhesion forces between the indenter and material surfaces, and to simulate accurately microscopic interactions during polishing process.
[en] Silicon nitride ceramics doped with four different composition of sintering additives were prepared by hot pressing (HP) sintering. The effect of CeO2 addition and Yb2O3 addition on the formation temperature of liquid phase, the densification, the microstructure and the mechanical properties of Si3N4 ceramics were investigated. The results show that their effects are independent of each other. Furthermore, in comparison to Si3N4 ceramics sintered with sole lanthanide oxides, the samples sintered with both CeO2 and Yb2O3 additions exhibited superior mechanical properties even with a lower sintering temperature.
[en] The effects of radiation degradation on the properties and structure of various polysulfone under various irradiations, such as electronic beam irradiation, γ-irradiation and heavy ion irradiation have been reviewed and discussed in this paper. It has been shown that the previous studies are mainly concerned with degradation mechanism, the kinds of gas products, radiation chemical yields of degraded polysulfone and the relationship between properties and constructure of irradiated polysulfone. However the basic studies were insufficient to estimate the applied lifetime of polysulfones under irradiation situation. And the achievements are helpful for understanding the degradation behavior of various polysulfones under irradiation. (authors)
[en] An integrated fluorescence analyser with X-ray as the excitation source is introduced. Tube control circuit and software development of this fluorescence analyser are discussed in detail. Embed arm microprocessor is used as control kernel in the analyser. Its advantages lie in the simplicity in operation and convenience in use. Experiments show that compared with radiation source excitation, with the setting of the appropriate parameters of the tube for the various elements, X-ray excitation is more efficient in excitation, faster in analysis and more environment-friendly. (authors)
[en] It describes decommissioning process of an irradiation plant after stucking sources, because the tilt of the goods has led to the source protection welding mask of the source and the lower slot, the staff in the process discovery a radioactive source due to external force cause shell damage. After detecting the surrounding environment water, soil sample we don't discover radioactive pollution. (authors)
[en] In this paper, we report key technologies and challenges in designing an X-ray fluorescence logging device developed especially for field drilling sites. The data obtained with the X-ray fluorescence logging device at a copper mine are compared with the results of chemical analysis, and it is demonstrated that this device can be used for field applications. (authors)
[en] Software of portable X-ray fluorescence analyzer (XRFA) in the DOS operating environment is developed, and takes PC/104 computer for data-processing equipment. The software can complete not only document management, access of peak area, regular measurement, but also smooth lines, automatic energy calibration, spectral line identification, automatic peak search and automatic elemental analysis. After serial communications, the procedures of the XRF analysis system in the DOS operating environment can be downloaded to portable XRFA. As application of the software, people can facilitate processing and analysis of nuclear spectrum. (authors)
[en] The paper Introduces a domestic first method combining with the nuclear technology and automation technology to dispose a large-scale irradiation facilities sources, using wired remote control. From the possibly of spontaneous combustion and explosion after stucking radioactive sources, it analyzes the effects on the environment. Realizing the information, control, mechanical, material, radiological and nuclear technology multidisciplinary joint tackling technology, and at high radiation field, achieving for man-machine binding and robot coordinate operations in engineering application etc. Several reliable technology innovation are obtained. (authors)