In this paper a technique for determining ^235U abundance is described. After chemical separation, uranium-rich ore (a compound of uranium with chemical and radioactive pure)is made into U3O8 by burning at 850℃, and ...In this paper a technique for determining ^235U abundance is described. After chemical separation, uranium-rich ore (a compound of uranium with chemical and radioactive pure)is made into U3O8 by burning at 850℃, and then the U3O8 is prepared as the radioactive measuring source with a definite weight and shape. The measurement is carried out of the net area of 185.7 keV γ -ray peak of ^235U by Ge (Li) γ -ray spectrometer, with the mixture of a number of primary uranium ores as normal abundance standard. Parallel analysis and counting are performed on the standard and samples with the same method. The abundance of ^235U will be known by comparing their net areas of 185.7 keV γ ray peaks of ^235U both in the samples and the standard. Two samples of uranium ore from China which are suspected to be anomalous in U abundance and one sample from Oklo natural reactor have been determined. The precision of the method is better than 1%.展开更多
The 15th Power Systems Computation Conference (PSCC'05) will take place in Liege, Belgium,August 22-26, 2005. PSCC has developed into one of the premier conferences in the area. The emphasis is on both theoretical...The 15th Power Systems Computation Conference (PSCC'05) will take place in Liege, Belgium,August 22-26, 2005. PSCC has developed into one of the premier conferences in the area. The emphasis is on both theoretical developments as well as practical applications in the utility and manufacturing industries.展开更多
IR Li2Ga2GeS6 nonlinear crystals were directly obtained with the composition of 40GeS2- 30Ga2Ss-30LieS, by the conventional melt-quenching method. The high depth digital image indicated that the obtained LizGa2GeS6 cr...IR Li2Ga2GeS6 nonlinear crystals were directly obtained with the composition of 40GeS2- 30Ga2Ss-30LieS, by the conventional melt-quenching method. The high depth digital image indicated that the obtained LizGa2GeS6 crystals showed a big size of 0.3 × 0.25 × 0.3 mm3. It was shown that the compound was very suscepfive to H20 with second harmonic observation. Besides, the glass-forming region of GeS2-Ga2S3- Li2S system was further studied by the conventional melt-quenching method.GeS2-Ga2S3-Li2S glass-ceramics containing IR Li2Ga2GeS6 nonlinear nanocrystals were obtained at a more carefully controlled heating rate.展开更多
Created in 1962,the Centre Spatial de Liège(CSL)(IAL Space at that time)is an applied research center owned by University of Liège,focused on design,integration and calibration of space observation instrumen...Created in 1962,the Centre Spatial de Liège(CSL)(IAL Space at that time)is an applied research center owned by University of Liège,focused on design,integration and calibration of space observation instruments,including environmental test facilities and high level laboratories.展开更多
文摘In this paper a technique for determining ^235U abundance is described. After chemical separation, uranium-rich ore (a compound of uranium with chemical and radioactive pure)is made into U3O8 by burning at 850℃, and then the U3O8 is prepared as the radioactive measuring source with a definite weight and shape. The measurement is carried out of the net area of 185.7 keV γ -ray peak of ^235U by Ge (Li) γ -ray spectrometer, with the mixture of a number of primary uranium ores as normal abundance standard. Parallel analysis and counting are performed on the standard and samples with the same method. The abundance of ^235U will be known by comparing their net areas of 185.7 keV γ ray peaks of ^235U both in the samples and the standard. Two samples of uranium ore from China which are suspected to be anomalous in U abundance and one sample from Oklo natural reactor have been determined. The precision of the method is better than 1%.
文摘The 15th Power Systems Computation Conference (PSCC'05) will take place in Liege, Belgium,August 22-26, 2005. PSCC has developed into one of the premier conferences in the area. The emphasis is on both theoretical developments as well as practical applications in the utility and manufacturing industries.
基金Funded by the National Natural Science Foundation of China(No.51272183)the Nanotechnology Program of Suzhou(No.ZXG201438)
文摘IR Li2Ga2GeS6 nonlinear crystals were directly obtained with the composition of 40GeS2- 30Ga2Ss-30LieS, by the conventional melt-quenching method. The high depth digital image indicated that the obtained LizGa2GeS6 crystals showed a big size of 0.3 × 0.25 × 0.3 mm3. It was shown that the compound was very suscepfive to H20 with second harmonic observation. Besides, the glass-forming region of GeS2-Ga2S3- Li2S system was further studied by the conventional melt-quenching method.GeS2-Ga2S3-Li2S glass-ceramics containing IR Li2Ga2GeS6 nonlinear nanocrystals were obtained at a more carefully controlled heating rate.
文摘Created in 1962,the Centre Spatial de Liège(CSL)(IAL Space at that time)is an applied research center owned by University of Liège,focused on design,integration and calibration of space observation instruments,including environmental test facilities and high level laboratories.
