We performed systematic laser spectroscopic investigations of La I spectral lines, using optogalvanic detection. Sixteen previously unknown even parity levels, having energies between 40,300 and 44,300 cm<sup>-1...We performed systematic laser spectroscopic investigations of La I spectral lines, using optogalvanic detection. Sixteen previously unknown even parity levels, having energies between 40,300 and 44,300 cm<sup>-1</sup>, are reported. These levels classify altogether 67 lines, not listed in spectral tables. The new levels were found due to the observation of the depopulation of the lower levels of the excited transitions. We found a remarkable variation of the observed widths of single hyperfine structure components dependent on the energy of the upper excited levels. Some levels having energies higher than 43,000 cm<sup>-1</sup> appear to have a very high ionization probability.展开更多
In fitting the double-differential measurements thelevelwidth broadening effect should be taken into account properly due to Heisenberg uncertainty.Besides level width broadening effect the energy resolution in the me...In fitting the double-differential measurements thelevelwidth broadening effect should be taken into account properly due to Heisenberg uncertainty.Besides level width broadening effect the energy resolution in the measurements is also needed in this procedure.In general,the traditional normal Gaussian expansion is employed.However,the research indicates that to do so in this way the energy balance could not hold.For this reason,the deformed Gaussian expansion functions with exponential form for both the single energy point and continuous spectrum are introduced,with which the normalization and energy balance conditions could hold exactly in the analytical form.展开更多
In the paper,we study the strong uniform consistency for the kernal estimates of random window w■th of density function and its derivatives under the condition that the sequence{X_n}of the ■ are the identically Φ-m...In the paper,we study the strong uniform consistency for the kernal estimates of random window w■th of density function and its derivatives under the condition that the sequence{X_n}of the ■ are the identically Φ-mixing random variabks.展开更多
Recently, Islamic banks have been presented as an alternative to conventional banks. Indeed, Islamic banks have proved their worth during the 2009 crisis. They are known like an ethical bank. In Tunisia, only three Is...Recently, Islamic banks have been presented as an alternative to conventional banks. Indeed, Islamic banks have proved their worth during the 2009 crisis. They are known like an ethical bank. In Tunisia, only three Islamic banks exist. Even the conventional banks are interested to offer Islamic banking products and services; they are called Islamic banking window. This paper aims to determine the level of acceptance of Islamic banking window on Tunisian consumers and the impact of the social professional category on it. The research questions as follows： Are the consumers familiar with the financial Islamic products？ Did they perceive any differences between conventional and Islamic financial products？ What are the levels of acceptance of an Islamic banking product offered by a conventional bank？ In this respect, a questionnaire was administrated to a sample size of 120 people constituted of 54% men and 46% women from Tunis City. Three types of social professional category are found： 62% employee, 32% senior, and 6% profession. The data were processed by SPSS 21. The results showed that the majority of the respondents have a lack of knowledge of the Islamic banking products. The majority of the respondents don＇t see any differences between the product name of conventional and Islamic banking products. The acceptance level of an Islamic banking product offered by a conventional bank is very satisfying, 53% of the respondents are certain to purchase an Islamic banking product from a conventional bank and 42% are not sure. Only 5% refused.展开更多
This work presents an implementation of an innovative single phase multilevel inverter using capacitors with reduced switches. The proposed Capacitor pattern H-bridge Multilevel Inverter (CPHMLI) topology consists of ...This work presents an implementation of an innovative single phase multilevel inverter using capacitors with reduced switches. The proposed Capacitor pattern H-bridge Multilevel Inverter (CPHMLI) topology consists of a proper number of Capacitor connected with switches and power sources. The advanced switching control supplied by Pulse Width Modulation (PDPWM) to attain mixed staircase switching state. The charging and discharging mode are achieved by calculating the voltage error at the load. Furthermore, to accomplish the higher voltage levels at the output with less number of semiconductors switches and simple commutation designed using CPHMLI topology. To prove the performance and effectiveness of the proposed approach, a set of experiments performed under various load conditions using MATLAB tool.展开更多
按照网络安全法等法律法规要求,应依法实施网络安全等级保护制度,深化网络安全等级保护政策和标准落实,健全完善网络安全保护工作机制,确保网络安全等级保护等级测评工作有效开展。文章分析了Windows服务器面临的安全问题及原因,按照等...按照网络安全法等法律法规要求,应依法实施网络安全等级保护制度,深化网络安全等级保护政策和标准落实,健全完善网络安全保护工作机制,确保网络安全等级保护等级测评工作有效开展。文章分析了Windows服务器面临的安全问题及原因,按照等级保护计算环境服务器(三级)相关测评项要求,以Windows Server 2019为研究对象,结合等级测评工作实践提出了Windows服务器安全加固方法,能帮助单位完成操作系统等级保护测评工作,提升操作系统层安全防护能力。展开更多
Assessment of ecological flow or water level for water bodies is important for the protection of de- graded or degrading ecosystems caused by water shortage in arid regions, and it has become a key issue in water reso...Assessment of ecological flow or water level for water bodies is important for the protection of de- graded or degrading ecosystems caused by water shortage in arid regions, and it has become a key issue in water resources planning. In the past several decades, many methods have been proposed to assess ecological flow for rivers and ecological water level for lakes or wetlands. To balance water uses by human and ecosystems, we proposed a general multi-objective programming model to determine minimum ecological flow or water level for inland water bodies, where two objectives are water index for human and habitat index for ecosystems, respectively Using the weighted sum method for multi-objective optimization, minimum ecological flow or water level can be determined from the breakpoint in the water index-habitat index curve, which is similar to the slope method to de- termine minimum ecological flow from wetted perimeter-discharge curve. However, the general multi-objective programming model is superior to the slope method in its physical meaning and calculation method. This model provides a general analysis method for ecological water uses of different inland water bodies, and can be used to define minimum ecological flow or water level by choosing appropriate water and habitat indices. Several com- monly used flow or water level assessment methods were found to be special cases of the general model, including the wetted perimeter method and the multi-objective physical habitat simulation method for ecological river flow, the inundated forest width method for regeneration flow of floodplain forest and the lake surface area method for eco- logical lake level. These methods were applied to determine minimum ecological flow or water level for two repre- sentative rivers and a lake in northern Xinjiang of China, including minimum ecological flow for the Ertix River, minimum regeneration flow for floodplain forest along the midstream of Kaxgar River, and minimum ecological lake level for the Ebinur Lake. The results illustrated the versatility of the general model, and can provide references for water resources planning and ecosystem protection for these rivers and lake.展开更多
文摘We performed systematic laser spectroscopic investigations of La I spectral lines, using optogalvanic detection. Sixteen previously unknown even parity levels, having energies between 40,300 and 44,300 cm<sup>-1</sup>, are reported. These levels classify altogether 67 lines, not listed in spectral tables. The new levels were found due to the observation of the depopulation of the lower levels of the excited transitions. We found a remarkable variation of the observed widths of single hyperfine structure components dependent on the energy of the upper excited levels. Some levels having energies higher than 43,000 cm<sup>-1</sup> appear to have a very high ionization probability.
文摘In fitting the double-differential measurements thelevelwidth broadening effect should be taken into account properly due to Heisenberg uncertainty.Besides level width broadening effect the energy resolution in the measurements is also needed in this procedure.In general,the traditional normal Gaussian expansion is employed.However,the research indicates that to do so in this way the energy balance could not hold.For this reason,the deformed Gaussian expansion functions with exponential form for both the single energy point and continuous spectrum are introduced,with which the normalization and energy balance conditions could hold exactly in the analytical form.
基金supported by Natural Science Foun■ion of Henan P■visial Commission of Bdusation
文摘In the paper,we study the strong uniform consistency for the kernal estimates of random window w■th of density function and its derivatives under the condition that the sequence{X_n}of the ■ are the identically Φ-mixing random variabks.
文摘Recently, Islamic banks have been presented as an alternative to conventional banks. Indeed, Islamic banks have proved their worth during the 2009 crisis. They are known like an ethical bank. In Tunisia, only three Islamic banks exist. Even the conventional banks are interested to offer Islamic banking products and services; they are called Islamic banking window. This paper aims to determine the level of acceptance of Islamic banking window on Tunisian consumers and the impact of the social professional category on it. The research questions as follows： Are the consumers familiar with the financial Islamic products？ Did they perceive any differences between conventional and Islamic financial products？ What are the levels of acceptance of an Islamic banking product offered by a conventional bank？ In this respect, a questionnaire was administrated to a sample size of 120 people constituted of 54% men and 46% women from Tunis City. Three types of social professional category are found： 62% employee, 32% senior, and 6% profession. The data were processed by SPSS 21. The results showed that the majority of the respondents have a lack of knowledge of the Islamic banking products. The majority of the respondents don＇t see any differences between the product name of conventional and Islamic banking products. The acceptance level of an Islamic banking product offered by a conventional bank is very satisfying, 53% of the respondents are certain to purchase an Islamic banking product from a conventional bank and 42% are not sure. Only 5% refused.
文摘This work presents an implementation of an innovative single phase multilevel inverter using capacitors with reduced switches. The proposed Capacitor pattern H-bridge Multilevel Inverter (CPHMLI) topology consists of a proper number of Capacitor connected with switches and power sources. The advanced switching control supplied by Pulse Width Modulation (PDPWM) to attain mixed staircase switching state. The charging and discharging mode are achieved by calculating the voltage error at the load. Furthermore, to accomplish the higher voltage levels at the output with less number of semiconductors switches and simple commutation designed using CPHMLI topology. To prove the performance and effectiveness of the proposed approach, a set of experiments performed under various load conditions using MATLAB tool.
文摘按照网络安全法等法律法规要求,应依法实施网络安全等级保护制度,深化网络安全等级保护政策和标准落实,健全完善网络安全保护工作机制,确保网络安全等级保护等级测评工作有效开展。文章分析了Windows服务器面临的安全问题及原因,按照等级保护计算环境服务器(三级)相关测评项要求,以Windows Server 2019为研究对象,结合等级测评工作实践提出了Windows服务器安全加固方法,能帮助单位完成操作系统等级保护测评工作,提升操作系统层安全防护能力。
基金supported by the Open Research Fund Program of State key Laboratory of Hydroscience and Engineering, Tsinghua University (sklhse-2013-A-03)the National Natural Science Foundation of China (50879041)
文摘Assessment of ecological flow or water level for water bodies is important for the protection of de- graded or degrading ecosystems caused by water shortage in arid regions, and it has become a key issue in water resources planning. In the past several decades, many methods have been proposed to assess ecological flow for rivers and ecological water level for lakes or wetlands. To balance water uses by human and ecosystems, we proposed a general multi-objective programming model to determine minimum ecological flow or water level for inland water bodies, where two objectives are water index for human and habitat index for ecosystems, respectively Using the weighted sum method for multi-objective optimization, minimum ecological flow or water level can be determined from the breakpoint in the water index-habitat index curve, which is similar to the slope method to de- termine minimum ecological flow from wetted perimeter-discharge curve. However, the general multi-objective programming model is superior to the slope method in its physical meaning and calculation method. This model provides a general analysis method for ecological water uses of different inland water bodies, and can be used to define minimum ecological flow or water level by choosing appropriate water and habitat indices. Several com- monly used flow or water level assessment methods were found to be special cases of the general model, including the wetted perimeter method and the multi-objective physical habitat simulation method for ecological river flow, the inundated forest width method for regeneration flow of floodplain forest and the lake surface area method for eco- logical lake level. These methods were applied to determine minimum ecological flow or water level for two repre- sentative rivers and a lake in northern Xinjiang of China, including minimum ecological flow for the Ertix River, minimum regeneration flow for floodplain forest along the midstream of Kaxgar River, and minimum ecological lake level for the Ebinur Lake. The results illustrated the versatility of the general model, and can provide references for water resources planning and ecosystem protection for these rivers and lake.
