This study proposes a batch rapid quantitative analysis method for multiple elements by combining the advantages of standard curve(SC)and calibration-free laser-induced breakdown spectroscopy(CF-LIBS)technology to ach...This study proposes a batch rapid quantitative analysis method for multiple elements by combining the advantages of standard curve(SC)and calibration-free laser-induced breakdown spectroscopy(CF-LIBS)technology to achieve synchronous,rapid,and accurate measurement of elements in a large number of samples,namely,SC-assisted CF-LIBS.Al alloy standard samples,divided into calibration and test samples,were applied to validate the proposed method.SC was built based on the characteristic line of Pb and Cr in the calibration sample,and the contents of Pb and Cr in the test sample were calculated with relative errors of 6%and 4%,respectively.SC built using Cr with multiple characteristic lines yielded better calculation results.The relative contents of ten elements in the test sample were calculated using CF-LIBS.Subsequently,the SC-assisted CF-LIBS was executed,with the majority of the calculation relative errors falling within the range of 2%-5%.Finally,the Al and Na contents of the Al alloy were predicted.The results demonstrate that it effectively enables the rapid and accurate quantitative analysis of multiple elements after a single-element SC analysis of the tested samples.Furthermore,this quantitative analysis method was successfully applied to soil and Astragalus samples,realizing an accurate calculation of the contents of multiple elements.Thus,it is important to advance the LIBS quantitative analysis and its related applications.展开更多
There are very few researches on the shape standard curve currently,and they merely remain on the level of description of the general concept and production experiences,lacking of the in-depth theoretical analysis,and...There are very few researches on the shape standard curve currently,and they merely remain on the level of description of the general concept and production experiences,lacking of the in-depth theoretical analysis,and the concrete principle,method and steps for determining the shape standard curve are not put forward,therefore,they are not applicable in industrial production.This is the weakest spot in the research on the basic shape theory.In this paper,the basic shape standard curve and the transverse distribution curve of the exit thickness are attained with stepwise optimization,which is based on the theoretical calculation method of the shape standard curve of strip mills proposed by authors.By calculating the shape discrimination model and the shape forecast model separately,the simultaneous iterative calculation by the previous method is avoided,and the speed and stability of calculation are improved.The compensation models of the transverse temperature difference of the strip,the shape detection roller deflection and the shape of the strip coil are established,respectively,meantime,the basic shape standard curves are compensated,and the relatively perfect theoretical establishment method of the shape standard curve is formed.The simulation and calculation are done on a 1 220 mm five-stand cold strip tandem mill.The simulation and calculation result shows that the principle,method and steps for determining the shape standard curve are correct and feasible,and the correctness of theoretical analysis and calculation is verified.This paper proposes an idea and a method for the establishment of the shape standard curve in the rolling processes of cold strip mills,which develop the theory and model of the shape standard curve and improve the quality and efficiency of the shape control in the rolling processes of cold strip mills.展开更多
A plasmid containing target DNA and a standard curve for real-time quantitative PCR of the cold-induced Cor3 gene of Volvariella volvacea were constructed. These will provide the basis for further research on Cor3 gen...A plasmid containing target DNA and a standard curve for real-time quantitative PCR of the cold-induced Cor3 gene of Volvariella volvacea were constructed. These will provide the basis for further research on Cor3 gene expression at low temperature, and ultimately for assigning a role for the gene in the low temperature autolysis of V. volvacea.展开更多
In the study of complex networks almost all theoretical models have the property of infinite growth, but the size of actual networks is finite. According to statistics from the China Internet IPv4 （Internet Protocol ...In the study of complex networks almost all theoretical models have the property of infinite growth, but the size of actual networks is finite. According to statistics from the China Internet IPv4 （Internet Protocol version 4） addresses, this paper proposes a forecasting model by using S curve （logistic curve）. The growing trend of IPv4 addresses in China is forecasted. There are some reference values for optimizing the distribution of IPv4 address resource and the development of IPv6. Based on the laws of IPv4 growth, that is, the bulk growth and the finitely growing limit, it proposes a finite network model with a bulk growth. The model is said to be an S-curve network. Analysis demonstrates that the analytic method based on uniform distributions （i.e., Barabasi-Albert method） is not suitable for the network. It develops an approximate method to predict the growth dynamics of the individual nodes, and uses this to calculate analytically the degree distribution and the scaling exponents. The analytical result agrees with the simulation well, obeying an approximately power-law form. This method can overcome a shortcoming of Barabasi-Albert method commonly used in current network research.展开更多
【目的】探讨纯中医规范化综合治疗短病程突发性聋(简称突聋)的临床疗效及其影响因素。【方法】对516例采用纯中医规范化综合治疗的短病程突聋住院患者(中医组)的临床资料进行回顾性分析,并与《中国突发性聋分型治疗的多中心临床研究》...【目的】探讨纯中医规范化综合治疗短病程突发性聋(简称突聋)的临床疗效及其影响因素。【方法】对516例采用纯中医规范化综合治疗的短病程突聋住院患者(中医组)的临床资料进行回顾性分析,并与《中国突发性聋分型治疗的多中心临床研究》的1024例患者(西医组)的疗效进行对照,分析患者性别、耳别、年龄、耳聋程度、听力曲线类型、伴随症状(耳鸣、眩晕、耳闷)及中医证型对疗效的影响。【结果】(1)基线资料比较:与西医组相比,中医组低频下降型占比较低,全聋型占比较高,治疗难度相对较大,而疗程缩短近2/3(12.60 d vs 30.00 d)。(2)疗效分析:中医组516例患者中,痊愈175例,显效121例,有效90例,无效130例,总有效率为74.80%,与西医组1024例相比,无论总体疗效还是按听力曲线分类统计疗效,差异均无统计学意义(P>0.05)。(3)疗效影响因素分析:听力曲线类型与突聋疗效关系密切(P<0.001),低频下降型疗效最好,全聋型疗效最差;耳聋程度越轻,痊愈可能性越大(P<0.001);无眩晕者疗效优于伴眩晕者(P<0.001);青少年患者疗效较中老年好(P<0.05);中医证型与疗效无关(P>0.05)。【结论】纯中医规范化综合治疗短病程突聋疗效较好,与西医常规治疗相比可能具有一定的优势;听力曲线类型、耳聋程度、是否伴随眩晕及年龄是影响疗效的相关因素。展开更多
基金supported by the Major Science and TechnologyTechnol-ogy Projects in Gansu Province(No.22ZD6FA021-5)Industrial Support Project of Gansu Province(Nos.2023CYZC-19 and 2021CYZC-22)+1 种基金Science and Technol-ogy Project of Gansu Province(Nos.23YFFA0074,22JR5RA137,and 22JR5RA151)Central Leading Local Science and Technology Development Fund Projects(No.23ZYQA293).
文摘This study proposes a batch rapid quantitative analysis method for multiple elements by combining the advantages of standard curve(SC)and calibration-free laser-induced breakdown spectroscopy(CF-LIBS)technology to achieve synchronous,rapid,and accurate measurement of elements in a large number of samples,namely,SC-assisted CF-LIBS.Al alloy standard samples,divided into calibration and test samples,were applied to validate the proposed method.SC was built based on the characteristic line of Pb and Cr in the calibration sample,and the contents of Pb and Cr in the test sample were calculated with relative errors of 6%and 4%,respectively.SC built using Cr with multiple characteristic lines yielded better calculation results.The relative contents of ten elements in the test sample were calculated using CF-LIBS.Subsequently,the SC-assisted CF-LIBS was executed,with the majority of the calculation relative errors falling within the range of 2%-5%.Finally,the Al and Na contents of the Al alloy were predicted.The results demonstrate that it effectively enables the rapid and accurate quantitative analysis of multiple elements after a single-element SC analysis of the tested samples.Furthermore,this quantitative analysis method was successfully applied to soil and Astragalus samples,realizing an accurate calculation of the contents of multiple elements.Thus,it is important to advance the LIBS quantitative analysis and its related applications.
基金supported by National Hi-tech Research and Development Program of China(863Program,Grant No.2009AA04Z143)National Science and Technology Support Plan of China(Grant No.2007BAF02B10)Hebei Provincial Great Natural Science Foundation of China(Grant No.E2006001038)
文摘There are very few researches on the shape standard curve currently,and they merely remain on the level of description of the general concept and production experiences,lacking of the in-depth theoretical analysis,and the concrete principle,method and steps for determining the shape standard curve are not put forward,therefore,they are not applicable in industrial production.This is the weakest spot in the research on the basic shape theory.In this paper,the basic shape standard curve and the transverse distribution curve of the exit thickness are attained with stepwise optimization,which is based on the theoretical calculation method of the shape standard curve of strip mills proposed by authors.By calculating the shape discrimination model and the shape forecast model separately,the simultaneous iterative calculation by the previous method is avoided,and the speed and stability of calculation are improved.The compensation models of the transverse temperature difference of the strip,the shape detection roller deflection and the shape of the strip coil are established,respectively,meantime,the basic shape standard curves are compensated,and the relatively perfect theoretical establishment method of the shape standard curve is formed.The simulation and calculation are done on a 1 220 mm five-stand cold strip tandem mill.The simulation and calculation result shows that the principle,method and steps for determining the shape standard curve are correct and feasible,and the correctness of theoretical analysis and calculation is verified.This paper proposes an idea and a method for the establishment of the shape standard curve in the rolling processes of cold strip mills,which develop the theory and model of the shape standard curve and improve the quality and efficiency of the shape control in the rolling processes of cold strip mills.
基金Sponsored by the Shanghai Academy of Agricultural Science and Shanghai Science Committee (No .003912076)
文摘A plasmid containing target DNA and a standard curve for real-time quantitative PCR of the cold-induced Cor3 gene of Volvariella volvacea were constructed. These will provide the basis for further research on Cor3 gene expression at low temperature, and ultimately for assigning a role for the gene in the low temperature autolysis of V. volvacea.
基金Project supported by the National Natural Science Foundation of China (Grant No. 70871082)the Shanghai Leading Academic Discipline Project (Grant No. S30504)
文摘In the study of complex networks almost all theoretical models have the property of infinite growth, but the size of actual networks is finite. According to statistics from the China Internet IPv4 （Internet Protocol version 4） addresses, this paper proposes a forecasting model by using S curve （logistic curve）. The growing trend of IPv4 addresses in China is forecasted. There are some reference values for optimizing the distribution of IPv4 address resource and the development of IPv6. Based on the laws of IPv4 growth, that is, the bulk growth and the finitely growing limit, it proposes a finite network model with a bulk growth. The model is said to be an S-curve network. Analysis demonstrates that the analytic method based on uniform distributions （i.e., Barabasi-Albert method） is not suitable for the network. It develops an approximate method to predict the growth dynamics of the individual nodes, and uses this to calculate analytically the degree distribution and the scaling exponents. The analytical result agrees with the simulation well, obeying an approximately power-law form. This method can overcome a shortcoming of Barabasi-Albert method commonly used in current network research.
文摘【目的】探讨纯中医规范化综合治疗短病程突发性聋(简称突聋)的临床疗效及其影响因素。【方法】对516例采用纯中医规范化综合治疗的短病程突聋住院患者(中医组)的临床资料进行回顾性分析,并与《中国突发性聋分型治疗的多中心临床研究》的1024例患者(西医组)的疗效进行对照,分析患者性别、耳别、年龄、耳聋程度、听力曲线类型、伴随症状(耳鸣、眩晕、耳闷)及中医证型对疗效的影响。【结果】(1)基线资料比较:与西医组相比,中医组低频下降型占比较低,全聋型占比较高,治疗难度相对较大,而疗程缩短近2/3(12.60 d vs 30.00 d)。(2)疗效分析:中医组516例患者中,痊愈175例,显效121例,有效90例,无效130例,总有效率为74.80%,与西医组1024例相比,无论总体疗效还是按听力曲线分类统计疗效,差异均无统计学意义(P>0.05)。(3)疗效影响因素分析:听力曲线类型与突聋疗效关系密切(P<0.001),低频下降型疗效最好,全聋型疗效最差;耳聋程度越轻,痊愈可能性越大(P<0.001);无眩晕者疗效优于伴眩晕者(P<0.001);青少年患者疗效较中老年好(P<0.05);中医证型与疗效无关(P>0.05)。【结论】纯中医规范化综合治疗短病程突聋疗效较好,与西医常规治疗相比可能具有一定的优势;听力曲线类型、耳聋程度、是否伴随眩晕及年龄是影响疗效的相关因素。
