Modern craflwork art, based on traditional craflwork art, with the constant development of the social production level, gradually forms; and they have a very close relationship. But, today＇ s modern craftwork art is ...Modern craflwork art, based on traditional craflwork art, with the constant development of the social production level, gradually forms; and they have a very close relationship. But, today＇ s modern craftwork art is not completed by hands and simple tools and doesn＇ t depend on the limited natural materials to cope with today＇ s human life needs, but it must be equipped with the beauty wisdom, industrial science and technology, economic ideas and production and manufacturing technology, so that it can produce the modern craftworks full of the era significance. This paper first analyzes the charm of modern craftwork art design, and then explains how to use the modern craftwork art design, which has a certain practical value and reference significance.展开更多
The purpose of this paper is to compare the performance of two spectrometers that are manufactured from the same company. In this work, heavy metals like lead Pb and copper Cu in the KBr matrix were analyzed using the...The purpose of this paper is to compare the performance of two spectrometers that are manufactured from the same company. In this work, heavy metals like lead Pb and copper Cu in the KBr matrix were analyzed using the laser induced breakdown spectroscopic technique. A Q-switched Nd：YAG laser with 90mJ per pulse operating at the fundamental wavelength of 1064nm and pulse duration of 10 ns was used to generate plasma at the focal region. The important experimental parameters such as the laser energy, integration time, distance between the lens and sample, distance and angle of the optical fiber from the target were optimized. Two spectrometers manufactured by Ocean Optics namely as Maya2000Pro and USB 4000 were employed for anlyzing the spectral lines. The experimental setup and conditions were remained the same for both experiments. The production of spectral lines from each of the interested elements was analyzed and compared with the NIST （National Institute of Standards and Technology） database. The sensitivity, repeatability and limit of detection for each of the systems are discussed in detail.展开更多
Monitoring the behavior of radioactive contaminants associated with military applications,nuclear power facilities,and interim storage of radioactive waste materials is of significant concern in radiological analysis....Monitoring the behavior of radioactive contaminants associated with military applications,nuclear power facilities,and interim storage of radioactive waste materials is of significant concern in radiological analysis.Four sequential extraction schemes(SES) for fractionation of ^(241)Am were compared using five different types of soils,Vertisol,Cambisol,Chromic Luvisol,Eutric Fluvisol,and mixed urban soil,collected from different parts of Bulgaria.The results for the exchangeable ^(241) Am were in a wide range and depended on the SES used.Soil ^(241)Am varied from 0.5%to 6%in the exchangeable phase,from 0.5%to 35%in the carbonate phase,from0.4%to 36%in the reducible phase(easily reducible and moderately reducible),from 3%to 17%in the oxidizable phase,and from10%to 50%in the residual phase.After 100 d of contamination,around 50%of soil ^(241)Am was permanently fixed in the residual phase.There was strong evidence that the preferable soil phase for ^(241) Am was the carbonate phase.The transfer factor of ^(241) Am in the soil-plant system depended on ^(241)Am in the easily oxidizable phase(fulvic acid(FA)+humic acid(HA) phase).These confirmed the applicability of the National Institute of Standards and Technology(NIST) sequential extraction scheme for fractionation of soil^(241) Am since it includes extraction of FA+HA phase and then the carbonate phase.展开更多
文摘Modern craflwork art, based on traditional craflwork art, with the constant development of the social production level, gradually forms; and they have a very close relationship. But, today＇ s modern craftwork art is not completed by hands and simple tools and doesn＇ t depend on the limited natural materials to cope with today＇ s human life needs, but it must be equipped with the beauty wisdom, industrial science and technology, economic ideas and production and manufacturing technology, so that it can produce the modern craftworks full of the era significance. This paper first analyzes the charm of modern craftwork art design, and then explains how to use the modern craftwork art design, which has a certain practical value and reference significance.
文摘The purpose of this paper is to compare the performance of two spectrometers that are manufactured from the same company. In this work, heavy metals like lead Pb and copper Cu in the KBr matrix were analyzed using the laser induced breakdown spectroscopic technique. A Q-switched Nd：YAG laser with 90mJ per pulse operating at the fundamental wavelength of 1064nm and pulse duration of 10 ns was used to generate plasma at the focal region. The important experimental parameters such as the laser energy, integration time, distance between the lens and sample, distance and angle of the optical fiber from the target were optimized. Two spectrometers manufactured by Ocean Optics namely as Maya2000Pro and USB 4000 were employed for anlyzing the spectral lines. The experimental setup and conditions were remained the same for both experiments. The production of spectral lines from each of the interested elements was analyzed and compared with the NIST （National Institute of Standards and Technology） database. The sensitivity, repeatability and limit of detection for each of the systems are discussed in detail.
文摘Monitoring the behavior of radioactive contaminants associated with military applications,nuclear power facilities,and interim storage of radioactive waste materials is of significant concern in radiological analysis.Four sequential extraction schemes(SES) for fractionation of ^(241)Am were compared using five different types of soils,Vertisol,Cambisol,Chromic Luvisol,Eutric Fluvisol,and mixed urban soil,collected from different parts of Bulgaria.The results for the exchangeable ^(241) Am were in a wide range and depended on the SES used.Soil ^(241)Am varied from 0.5%to 6%in the exchangeable phase,from 0.5%to 35%in the carbonate phase,from0.4%to 36%in the reducible phase(easily reducible and moderately reducible),from 3%to 17%in the oxidizable phase,and from10%to 50%in the residual phase.After 100 d of contamination,around 50%of soil ^(241)Am was permanently fixed in the residual phase.There was strong evidence that the preferable soil phase for ^(241) Am was the carbonate phase.The transfer factor of ^(241) Am in the soil-plant system depended on ^(241)Am in the easily oxidizable phase(fulvic acid(FA)+humic acid(HA) phase).These confirmed the applicability of the National Institute of Standards and Technology(NIST) sequential extraction scheme for fractionation of soil^(241) Am since it includes extraction of FA+HA phase and then the carbonate phase.
