The thick target neutron yields （TTNYs） of deuteron-induced reaction on AI and Cu isotopes are analyzed by combining the improved nuclear models and particle transport effects. The modified Glauber model is employed...The thick target neutron yields （TTNYs） of deuteron-induced reaction on AI and Cu isotopes are analyzed by combining the improved nuclear models and particle transport effects. The modified Glauber model is employed mainly to produce the peak of double differential cross section for the breakup process, and the exciton model and the Hauser-Feshbach theory are used for the statistical processes. The thin-layer accumulation method is used to calculate the TTNYs considering the neutron attenuation effects in the target. The calculated results are compared with the existing experimental data, and the analysis method can predict the TTNY data well at the deuteron energy of 40 MeV.展开更多
It is important to revisit our plans and compare what was ideally targeted against what was actually achieved in implementation. In comparing the achievements with targets, strengths or weaknesses of established strat...It is important to revisit our plans and compare what was ideally targeted against what was actually achieved in implementation. In comparing the achievements with targets, strengths or weaknesses of established strategies can be accepted or corrections implemented since a plan also outlines some strategies for achieving the targets set. In this study, achievements in production and export of industrial forest products, i.e., sawn wood, plywood, chipboard and fibreboard, paper and paperboard and industrial round wood, are compared against targeted figures for 1996 for Tanzania. Discrepancies were obtained by subtracting targeted from achieved values and expressed both as absolute and relative differences in terms of the targeted values, with a negative sign for pro- duction where achievements were less than targets and a positive sign when achievements were higher than targets. Values achieved ranged from 4%-100% of the targeted values, depending on the product, and were only higher than the targeted value for industrial round wood. Possible causes of the discrepancies are inefficiency of parastatal companies, low private investment, sub-maximal in- dustrial operation and plant inefficiencies. Discrepancies could also result from unrealistic data used in planning due to difficulty in data availability and poor intra- and inter-sectoral coordination. The implications of these discrepancies are low contributions of the wood-based industry to the national economy, increased import substitution of wood-based products, increased socio-economic and environmental degradation and decreased integrity in planning and policy making.展开更多
This paper, excerpted from General President Gao Yan’s Speech on the State Power Corporation Working Conference for 2001, held in Shenzhen on December 23-25, 2000, reviews the power production and construction tasks ...This paper, excerpted from General President Gao Yan’s Speech on the State Power Corporation Working Conference for 2001, held in Shenzhen on December 23-25, 2000, reviews the power production and construction tasks in 2000 and puts forward the major targets and focal tasks of power production and construction for 2001.展开更多
This study obtains a suitable reaction to produce 86Y. The 86Y excitation functions via 86Sr(p,n)86Y, 86Sr(d,2n)86Y, 85Rb(3He,2n)86Y and 85Rb(α,3n)86Y reactions were calculated by TALYS-1.0 code and compared with the...This study obtains a suitable reaction to produce 86Y. The 86Y excitation functions via 86Sr(p,n)86Y, 86Sr(d,2n)86Y, 85Rb(3He,2n)86Y and 85Rb(α,3n)86Y reactions were calculated by TALYS-1.0 code and compared with the reported measurement. Requisite thickness of targets was obtained by SRIM code for each reaction. The 86Y production yield was evaluated with attention to excitation function and stopping power. The 86Sr(p,n)86Y reaction was determined as most interesting one due to its highest production yield and advantages to get high radionuclide and radiochemical purity.展开更多
In order to express information on the quality grade of product designed, the target value of product quality design was described with a fuzzy number in this paper. The rule of robust design with a fuzzy target was ...In order to express information on the quality grade of product designed, the target value of product quality design was described with a fuzzy number in this paper. The rule of robust design with a fuzzy target was analyzed with fuzzy probability theory, then the principle and modeling method of fuzzy robust design for a high quality product were put forward. With this new method used, the high quality ratio of the product designed could be increased, and the ability to resist the influence of various disturbing factors and noise factors could be enhanced.展开更多
Methane(CH4),the predominant component of natural gas and shale gas,is regarded as a promising carbon feedstock for chemical synthesis[1].However,considering the extreme stability of CH4 molecules,it's quite chall...Methane(CH4),the predominant component of natural gas and shale gas,is regarded as a promising carbon feedstock for chemical synthesis[1].However,considering the extreme stability of CH4 molecules,it's quite challenging in simultaneously achieving high activity and selectivity for target products under mild conditions,especially when synthesizing high-value C2t chemicals such as ethanol[2].The conversion of methane to ethanol by photocatalysis is promising for achieving transformation under ambient temperature and pressure conditions.Currently,the apparent quantum efficiency(AQE)of solar-driven methane-to-ethanol conversion is generally below 0.5%[3,4].Furthermore,the stability of photocatalysts remains inadequate,offering substantial potential for further improvement.展开更多
In expounding the historical conditions of " two necessities",Marx profoundly criticized the consequence of capitalist mode of production to society and ecology. Through the analysis of the capitalist relati...In expounding the historical conditions of " two necessities",Marx profoundly criticized the consequence of capitalist mode of production to society and ecology. Through the analysis of the capitalist relations of production,Marx systematically completed the viewpoint system about the material circulation of nature and human society,and foresaw the ecological consequences of capitalism to the world scientifically,taking ecology and mode of production as an organic whole. Since the socialism with Chinese characteristics entered into the new era,facing the serious ecological problems in the countryside in the process of modernization,the Party and the state,through the latest interpretation of the basic principles of Marxism,have creatively replaced the unsustainable poverty-alleviation policy with the targeted poverty-alleviation policy,thus making it have an important ecological orientation in the practice of poverty-alleviation in the countryside.展开更多
In order to express information on the quality grade of product designed, thetarget value of product quality design was described with a fuzzy number in this paper. Analternative to Taguchi's, the robustness appli...In order to express information on the quality grade of product designed, thetarget value of product quality design was described with a fuzzy number in this paper. Analternative to Taguchi's, the robustness application design method has been recently presented.However, neither Taguchi's method nor the alternative method is capable of dealing satisfactorilywith the frequently encountered situations in which all the noise variables cannot be studiedsimultaneously. Based on the ideas from response surface modeling, linear models theory, and randomeffects models, we provide a method for estimation in the robustness application design method inproduct quality applications. With this new method used, the high-quality ratio of the productdesigned could be increased, and the ability to resist the influence of various disturbing factorsand noise factors could be enhanced.展开更多
基金Supported by the Project of China Academy of Engineering Physics under Grant No 2013B0103015
文摘The thick target neutron yields （TTNYs） of deuteron-induced reaction on AI and Cu isotopes are analyzed by combining the improved nuclear models and particle transport effects. The modified Glauber model is employed mainly to produce the peak of double differential cross section for the breakup process, and the exciton model and the Hauser-Feshbach theory are used for the statistical processes. The thin-layer accumulation method is used to calculate the TTNYs considering the neutron attenuation effects in the target. The calculated results are compared with the existing experimental data, and the analysis method can predict the TTNY data well at the deuteron energy of 40 MeV.
文摘It is important to revisit our plans and compare what was ideally targeted against what was actually achieved in implementation. In comparing the achievements with targets, strengths or weaknesses of established strategies can be accepted or corrections implemented since a plan also outlines some strategies for achieving the targets set. In this study, achievements in production and export of industrial forest products, i.e., sawn wood, plywood, chipboard and fibreboard, paper and paperboard and industrial round wood, are compared against targeted figures for 1996 for Tanzania. Discrepancies were obtained by subtracting targeted from achieved values and expressed both as absolute and relative differences in terms of the targeted values, with a negative sign for pro- duction where achievements were less than targets and a positive sign when achievements were higher than targets. Values achieved ranged from 4%-100% of the targeted values, depending on the product, and were only higher than the targeted value for industrial round wood. Possible causes of the discrepancies are inefficiency of parastatal companies, low private investment, sub-maximal in- dustrial operation and plant inefficiencies. Discrepancies could also result from unrealistic data used in planning due to difficulty in data availability and poor intra- and inter-sectoral coordination. The implications of these discrepancies are low contributions of the wood-based industry to the national economy, increased import substitution of wood-based products, increased socio-economic and environmental degradation and decreased integrity in planning and policy making.
文摘This paper, excerpted from General President Gao Yan’s Speech on the State Power Corporation Working Conference for 2001, held in Shenzhen on December 23-25, 2000, reviews the power production and construction tasks in 2000 and puts forward the major targets and focal tasks of power production and construction for 2001.
文摘This study obtains a suitable reaction to produce 86Y. The 86Y excitation functions via 86Sr(p,n)86Y, 86Sr(d,2n)86Y, 85Rb(3He,2n)86Y and 85Rb(α,3n)86Y reactions were calculated by TALYS-1.0 code and compared with the reported measurement. Requisite thickness of targets was obtained by SRIM code for each reaction. The 86Y production yield was evaluated with attention to excitation function and stopping power. The 86Sr(p,n)86Y reaction was determined as most interesting one due to its highest production yield and advantages to get high radionuclide and radiochemical purity.
文摘In order to express information on the quality grade of product designed, the target value of product quality design was described with a fuzzy number in this paper. The rule of robust design with a fuzzy target was analyzed with fuzzy probability theory, then the principle and modeling method of fuzzy robust design for a high quality product were put forward. With this new method used, the high quality ratio of the product designed could be increased, and the ability to resist the influence of various disturbing factors and noise factors could be enhanced.
基金the support from the National Natural Science Foundation of China(52202306)Program from Guangdong Introducing Innovative and Entrepreneurial Teams(2019ZT08L101 and RCTDPT-2020-001)+1 种基金Shenzhen Key Laboratory of Eco-materials and Renewable Energy(ZDSYS20200922160400001)the Provincial Talent Plan of Guangdong(2023TB0012).
文摘Methane(CH4),the predominant component of natural gas and shale gas,is regarded as a promising carbon feedstock for chemical synthesis[1].However,considering the extreme stability of CH4 molecules,it's quite challenging in simultaneously achieving high activity and selectivity for target products under mild conditions,especially when synthesizing high-value C2t chemicals such as ethanol[2].The conversion of methane to ethanol by photocatalysis is promising for achieving transformation under ambient temperature and pressure conditions.Currently,the apparent quantum efficiency(AQE)of solar-driven methane-to-ethanol conversion is generally below 0.5%[3,4].Furthermore,the stability of photocatalysts remains inadequate,offering substantial potential for further improvement.
基金Supported by Graduate Innovation Fund Project of Shaanxi Normal University(2018 CSWY016)
文摘In expounding the historical conditions of " two necessities",Marx profoundly criticized the consequence of capitalist mode of production to society and ecology. Through the analysis of the capitalist relations of production,Marx systematically completed the viewpoint system about the material circulation of nature and human society,and foresaw the ecological consequences of capitalism to the world scientifically,taking ecology and mode of production as an organic whole. Since the socialism with Chinese characteristics entered into the new era,facing the serious ecological problems in the countryside in the process of modernization,the Party and the state,through the latest interpretation of the basic principles of Marxism,have creatively replaced the unsustainable poverty-alleviation policy with the targeted poverty-alleviation policy,thus making it have an important ecological orientation in the practice of poverty-alleviation in the countryside.
文摘In order to express information on the quality grade of product designed, thetarget value of product quality design was described with a fuzzy number in this paper. Analternative to Taguchi's, the robustness application design method has been recently presented.However, neither Taguchi's method nor the alternative method is capable of dealing satisfactorilywith the frequently encountered situations in which all the noise variables cannot be studiedsimultaneously. Based on the ideas from response surface modeling, linear models theory, and randomeffects models, we provide a method for estimation in the robustness application design method inproduct quality applications. With this new method used, the high-quality ratio of the productdesigned could be increased, and the ability to resist the influence of various disturbing factorsand noise factors could be enhanced.
