In this paper, a numerical solution for a system of singularly perturbed convection-diffusion equations is studied. The system is discretized by the Il’in scheme on a uniform mesh. It is proved that the numerical sch...In this paper, a numerical solution for a system of singularly perturbed convection-diffusion equations is studied. The system is discretized by the Il’in scheme on a uniform mesh. It is proved that the numerical scheme has first order accuracy, which is uniform with respect to the perturbation parameters. We show that the condition number of the discrete linear system obtained from applying the Il’in scheme for a system of singularly perturbed convection-diffusion equations is O(N) and the relevant coefficient matrix is well conditioned in comparison with the matrices obtained from applying upwind finite difference schemes on this problem. Numerical results confirm the theory of the method.展开更多
Multiple quantum well(MQW) Ⅲ-nitride diodes that can simultaneously emit and detect light feature an overlapping region between their electroluminescence and responsivity spectra, which allows them to be simultaneous...Multiple quantum well(MQW) Ⅲ-nitride diodes that can simultaneously emit and detect light feature an overlapping region between their electroluminescence and responsivity spectra, which allows them to be simultaneously used as both a transmitter and a receiver in a wireless light communication system. Here, we demonstrate a mobile light communication system using a time-division multiplexing(TDM) scheme to achieve bidirectional data transmission via the same optical channel.Two identical blue MQW diodes are defined by software as a transmitter or a receiver. To address the light alignment issue, an image identification module integrated with a gimbal stabilizer is used to automatically detect the locations of moving targets;thus, underwater audio communication is realized via a mobile blue-light TDM communication mode. This approach not only uses a single link but also integrates mobile nodes in a practical network.展开更多
Cost-effective multilevel techniques for homogeneous hyperbolic conservation laws are very successful in reducing the computational cost associated to high resolution shock capturing numerical schemes.Because they do ...Cost-effective multilevel techniques for homogeneous hyperbolic conservation laws are very successful in reducing the computational cost associated to high resolution shock capturing numerical schemes.Because they do not involve any special data structure,and do not induce savings in memory requirements,they are easily implemented on existing codes and are recommended for 1D and 2D simulations when intensive testing is required.The multilevel technique can also be applied to balance laws,but in this case,numerical errors may be induced by the technique.We present a series of numerical tests that point out that the use of monotonicity-preserving interpolatory techniques eliminates the numerical errors observed when using the usual 4-point centered Lagrange interpolation,and leads to a more robust multilevel code for balance laws,while maintaining the efficiency rates observed forhyperbolic conservation laws.展开更多
We present a class of arbitrarily high order fully explicit kinetic numerical methods in compressible fluid dynamics,both in time and space,which include the relaxation schemes by Jin and Xin.These methods can use the...We present a class of arbitrarily high order fully explicit kinetic numerical methods in compressible fluid dynamics,both in time and space,which include the relaxation schemes by Jin and Xin.These methods can use the CFL number larger or equal to unity on regular Cartesian meshes for the multi-dimensional case.These kinetic models depend on a small parameter that can be seen as a"Knudsen"number.The method is asymptotic preserving in this Knudsen number.Also,the computational costs of the method are of the same order of a fully explicit scheme.This work is the extension of Abgrall et al.(2022)[3]to multidimensional systems.We have assessed our method on several problems for two-dimensional scalar problems and Euler equations and the scheme has proven to be robust and to achieve the theoretically predicted high order of accuracy on smooth solutions.展开更多
^(99)Mo是重要的医用放射性核素,溶剂萃取法是反应堆辐照^(235)U靶生产裂变^(99)Mo的分离方法之一。为探讨离子液体Cyphos IL 101用于裂变^(99)Mo分离的可能性,本研究评价了离子液体Cyphos IL 101在硝酸体系中对Mo(Ⅵ)的萃取行为,重点...^(99)Mo是重要的医用放射性核素,溶剂萃取法是反应堆辐照^(235)U靶生产裂变^(99)Mo的分离方法之一。为探讨离子液体Cyphos IL 101用于裂变^(99)Mo分离的可能性,本研究评价了离子液体Cyphos IL 101在硝酸体系中对Mo(Ⅵ)的萃取行为,重点考察了稀释剂、水相初始pH、萃取时间、温度、离子液体浓度等对萃取Mo(Ⅵ)的影响。结果表明,选用甲苯作为稀释剂时,Cyphos IL 101对Mo(Ⅵ)的萃取效果最好,在pH=3条件下,萃取率高达98.87%;萃取为自发进行的过程,且可在5 min达到平衡;选用1 mol/L Na_(2)CO_(3)作为反萃剂,一次反萃可将负载有机相中96.56%的Mo反萃到水相中。构建的离子液体Cyphos IL 101萃取体系对Mo与主要杂质Sr、Cs、Te等有很好的分离效果,体现了其对Mo(Ⅵ)的高选择性萃取能力。以上结果可为将离子液体Cyphos IL 101引入裂变^(99)Mo的分离工艺流程提供参考。展开更多
In order to address the issue of gold mixing caused by the Kelvin-Helmholtz instability(KHI)in the double-cone ignition(DCI)scheme,we investigate the growth rate of the KHI at the bi-interface of the DCI scheme after ...In order to address the issue of gold mixing caused by the Kelvin-Helmholtz instability(KHI)in the double-cone ignition(DCI)scheme,we investigate the growth rate of the KHI at the bi-interface of the DCI scheme after applying a coating.This is done by solving the hydrodynamic equations for an ideal incompressible fluid using linear theory.Ultimately,it is discovered that applying a coating with a thickness slightly above h=0.5(λ+10μm)and a density somewhat lower than that of the target layer can effectively reduce the growth rate of interfacial KHI.This work provides theoretical references for studying the bi-interface KHI in the DCI scheme.展开更多
目的:利用生信分析探讨细胞因子IL-12及IFN-γ对乳腺癌患者免疫微环境的影响,并结合临床病理特征,对其评估新辅助化疗疗效的价值进行研究。方法:在基因表达综合(GEO)数据库中下载GSE163882,比较IL-12相对应基因IL12B及IFN-γ相对应基因I...目的:利用生信分析探讨细胞因子IL-12及IFN-γ对乳腺癌患者免疫微环境的影响,并结合临床病理特征,对其评估新辅助化疗疗效的价值进行研究。方法:在基因表达综合(GEO)数据库中下载GSE163882,比较IL-12相对应基因IL12B及IFN-γ相对应基因IFNG在病理完全缓解(pCR)患者和残留病灶(RD)患者中的表达。收集于我院接受新辅助化疗的50例乳腺癌患者的临床资料,使用卡方检验分析临床病理特征与新辅助化疗疗效的相关性;通过ROC曲线评估血清IL-12、IFN-γ的预测价值,并且确定最佳截断值;采用二元Logistic回归进行多因素分析。通过ssGSEA免疫浸润分析IL12B和IFNG与免疫细胞浸润的相关性;采用GO和KEGG功能富集分析,探讨相关基因潜在生物学功能及信号通路。结果:在GEO数据库GSE163882数据集中IL12B和IFNG在pCR患者中呈现高表达。于我院收治的临床患者中pCR患者化疗前血清IL-12和IFN-γ水平明显高于非pCR组(P γ表达状态显著相关(P γ水平是新辅助化疗疗效的独立影响因素。免疫浸润分析显示,活化CD4 T细胞、活化CD8 T细胞、活化B细胞和自然杀伤细胞在pCR患者中高度浸润。结论:血清IL-12和IFN-γ表达状态与新辅助化疗效果具有相关性,化疗前血清IFN-γ高表达是pCR的独立预测因子。Objective: To investigate the effects of cytokines IL-12 and IFN-γ on the immune microenvironment of breast cancer patients by means of Bioinformatics analysis, and to study their value in evaluating the efficacy of neoadjuvant chemotherapy combined with clinicopathological characteristics. Methods: GSE163882 was downloaded from the Gene Expression Omnibus database, and the expressions of IL-12 corresponding gene IL12B and IFNG corresponding gene IFN-γ were compared in pathologic complete response patients and residual lesion patients. The clinical data of 50 breast cancer patients who received neoadjuvant chemotherapy at The Affiliated Hospital of Qingdao University were collected. Chi-square test was used to analyze the correlation between clinicopathological features and the efficacy of neoadjuvant chemotherapy. The predictive value of serum IL-12 and IFN-γ was evaluated by ROC curve. Multivariate analysis was performed by binary Logistic regression. The correlation between IL12B and IFNG and immune cell infiltration was analyzed by ssGSEA immunoinfiltration. GO and KEGG functional enrichment analysis were used to explore the potential biological functions and signaling pathways of related genes. Results: IL12B and IFNG were highly expressed in pCR patients in the GSE163882 dataset. The serum levels of IL-12 and IFN-γ in pCR patients before chemotherapy were significantly higher than those in non-PCR group (P γ expression after neoadjuvant chemotherapy (P γ level before chemotherapy was an independent factor influencing the efficacy of neoadjuvant chemotherapy. Immunoinfiltration analysis showed that activated CD4 T cells, activated CD8 T cells, activated B cells, and natural killer cells were highly infiltrated in pCR patients. Conclusion: The expression of serum IL-12 and IFN-γ is correlated with the effect of neoadjuvant chemotherapy, and the high expression of serum IFN-γ before chemotherapy is an independent predictor of pCR.展开更多
In this paper,we propose a second-order moving-water equilibria preserving nonstaggered central scheme to solve the Ripa model via flux globalization.To maintain the moving-water steady states,we use the discrete sour...In this paper,we propose a second-order moving-water equilibria preserving nonstaggered central scheme to solve the Ripa model via flux globalization.To maintain the moving-water steady states,we use the discrete source terms proposed by Britton et al.(J Sci Comput,2020,82(2):Art 30)by incorporating the expression of the source terms as a whole into the flux gradient,which directly avoids the discrete complexity of the source terms in order to maintain the well-balanced properties of the scheme.In addition,since the nonstaggered central scheme requires re-projecting the updated values of the nonstaggered cells onto the staggered cells,we modify the calculation of the global variables by constructing ghost cells and alternating the values of the global variables with the water depths obtained from the solution through the nonlinear relationship between the global flux and the water depth.In order to maintain the second-order accuracy of the scheme on the time scale,we incorporate a new Runge-Kutta type time discretization in the evolution of the numerical solution for the nonstaggered cells.Meanwhile,we introduce the"draining"time step technique to ensure that the water depth is positive and that it satisfies mass conservation.Numerical experiments verify that the scheme is well-balanced,positivity-preserving and robust.展开更多
文摘In this paper, a numerical solution for a system of singularly perturbed convection-diffusion equations is studied. The system is discretized by the Il’in scheme on a uniform mesh. It is proved that the numerical scheme has first order accuracy, which is uniform with respect to the perturbation parameters. We show that the condition number of the discrete linear system obtained from applying the Il’in scheme for a system of singularly perturbed convection-diffusion equations is O(N) and the relevant coefficient matrix is well conditioned in comparison with the matrices obtained from applying upwind finite difference schemes on this problem. Numerical results confirm the theory of the method.
基金jointly supported by the National Natural Science Foundation of China (U21A20495)Natural Science Foundation of Jiangsu Province (BG2024023)+1 种基金National Key Research and Development Program of China (2022YFE0112000)111 Project (D17018)。
文摘Multiple quantum well(MQW) Ⅲ-nitride diodes that can simultaneously emit and detect light feature an overlapping region between their electroluminescence and responsivity spectra, which allows them to be simultaneously used as both a transmitter and a receiver in a wireless light communication system. Here, we demonstrate a mobile light communication system using a time-division multiplexing(TDM) scheme to achieve bidirectional data transmission via the same optical channel.Two identical blue MQW diodes are defined by software as a transmitter or a receiver. To address the light alignment issue, an image identification module integrated with a gimbal stabilizer is used to automatically detect the locations of moving targets;thus, underwater audio communication is realized via a mobile blue-light TDM communication mode. This approach not only uses a single link but also integrates mobile nodes in a practical network.
基金supported by Grant PID2020-117211GB-I00funded by MCIN/AEI/10.13039/501100011033+4 种基金by Grant CIAICO/2021/227funded by the Generalitat Valencianasupported by the Ministerio de Ciencia e Innovacion of Spain(Grant Ref.PID2021-125709OB-C21)funded by MCIN/AEI/10.13039/501100011033/FEDER,UEby the Generalitat Valenciana(CIAICO/2021/224).
文摘Cost-effective multilevel techniques for homogeneous hyperbolic conservation laws are very successful in reducing the computational cost associated to high resolution shock capturing numerical schemes.Because they do not involve any special data structure,and do not induce savings in memory requirements,they are easily implemented on existing codes and are recommended for 1D and 2D simulations when intensive testing is required.The multilevel technique can also be applied to balance laws,but in this case,numerical errors may be induced by the technique.We present a series of numerical tests that point out that the use of monotonicity-preserving interpolatory techniques eliminates the numerical errors observed when using the usual 4-point centered Lagrange interpolation,and leads to a more robust multilevel code for balance laws,while maintaining the efficiency rates observed forhyperbolic conservation laws.
基金funded by the SNF project 200020_204917 entitled"Structure preserving and fast methods for hyperbolic systems of conservation laws".
文摘We present a class of arbitrarily high order fully explicit kinetic numerical methods in compressible fluid dynamics,both in time and space,which include the relaxation schemes by Jin and Xin.These methods can use the CFL number larger or equal to unity on regular Cartesian meshes for the multi-dimensional case.These kinetic models depend on a small parameter that can be seen as a"Knudsen"number.The method is asymptotic preserving in this Knudsen number.Also,the computational costs of the method are of the same order of a fully explicit scheme.This work is the extension of Abgrall et al.(2022)[3]to multidimensional systems.We have assessed our method on several problems for two-dimensional scalar problems and Euler equations and the scheme has proven to be robust and to achieve the theoretically predicted high order of accuracy on smooth solutions.
文摘^(99)Mo是重要的医用放射性核素,溶剂萃取法是反应堆辐照^(235)U靶生产裂变^(99)Mo的分离方法之一。为探讨离子液体Cyphos IL 101用于裂变^(99)Mo分离的可能性,本研究评价了离子液体Cyphos IL 101在硝酸体系中对Mo(Ⅵ)的萃取行为,重点考察了稀释剂、水相初始pH、萃取时间、温度、离子液体浓度等对萃取Mo(Ⅵ)的影响。结果表明,选用甲苯作为稀释剂时,Cyphos IL 101对Mo(Ⅵ)的萃取效果最好,在pH=3条件下,萃取率高达98.87%;萃取为自发进行的过程,且可在5 min达到平衡;选用1 mol/L Na_(2)CO_(3)作为反萃剂,一次反萃可将负载有机相中96.56%的Mo反萃到水相中。构建的离子液体Cyphos IL 101萃取体系对Mo与主要杂质Sr、Cs、Te等有很好的分离效果,体现了其对Mo(Ⅵ)的高选择性萃取能力。以上结果可为将离子液体Cyphos IL 101引入裂变^(99)Mo的分离工艺流程提供参考。
基金Project supported by the Strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDA 25051000)。
文摘In order to address the issue of gold mixing caused by the Kelvin-Helmholtz instability(KHI)in the double-cone ignition(DCI)scheme,we investigate the growth rate of the KHI at the bi-interface of the DCI scheme after applying a coating.This is done by solving the hydrodynamic equations for an ideal incompressible fluid using linear theory.Ultimately,it is discovered that applying a coating with a thickness slightly above h=0.5(λ+10μm)and a density somewhat lower than that of the target layer can effectively reduce the growth rate of interfacial KHI.This work provides theoretical references for studying the bi-interface KHI in the DCI scheme.
文摘目的:利用生信分析探讨细胞因子IL-12及IFN-γ对乳腺癌患者免疫微环境的影响,并结合临床病理特征,对其评估新辅助化疗疗效的价值进行研究。方法:在基因表达综合(GEO)数据库中下载GSE163882,比较IL-12相对应基因IL12B及IFN-γ相对应基因IFNG在病理完全缓解(pCR)患者和残留病灶(RD)患者中的表达。收集于我院接受新辅助化疗的50例乳腺癌患者的临床资料,使用卡方检验分析临床病理特征与新辅助化疗疗效的相关性;通过ROC曲线评估血清IL-12、IFN-γ的预测价值,并且确定最佳截断值;采用二元Logistic回归进行多因素分析。通过ssGSEA免疫浸润分析IL12B和IFNG与免疫细胞浸润的相关性;采用GO和KEGG功能富集分析,探讨相关基因潜在生物学功能及信号通路。结果:在GEO数据库GSE163882数据集中IL12B和IFNG在pCR患者中呈现高表达。于我院收治的临床患者中pCR患者化疗前血清IL-12和IFN-γ水平明显高于非pCR组(P γ表达状态显著相关(P γ水平是新辅助化疗疗效的独立影响因素。免疫浸润分析显示,活化CD4 T细胞、活化CD8 T细胞、活化B细胞和自然杀伤细胞在pCR患者中高度浸润。结论:血清IL-12和IFN-γ表达状态与新辅助化疗效果具有相关性,化疗前血清IFN-γ高表达是pCR的独立预测因子。Objective: To investigate the effects of cytokines IL-12 and IFN-γ on the immune microenvironment of breast cancer patients by means of Bioinformatics analysis, and to study their value in evaluating the efficacy of neoadjuvant chemotherapy combined with clinicopathological characteristics. Methods: GSE163882 was downloaded from the Gene Expression Omnibus database, and the expressions of IL-12 corresponding gene IL12B and IFNG corresponding gene IFN-γ were compared in pathologic complete response patients and residual lesion patients. The clinical data of 50 breast cancer patients who received neoadjuvant chemotherapy at The Affiliated Hospital of Qingdao University were collected. Chi-square test was used to analyze the correlation between clinicopathological features and the efficacy of neoadjuvant chemotherapy. The predictive value of serum IL-12 and IFN-γ was evaluated by ROC curve. Multivariate analysis was performed by binary Logistic regression. The correlation between IL12B and IFNG and immune cell infiltration was analyzed by ssGSEA immunoinfiltration. GO and KEGG functional enrichment analysis were used to explore the potential biological functions and signaling pathways of related genes. Results: IL12B and IFNG were highly expressed in pCR patients in the GSE163882 dataset. The serum levels of IL-12 and IFN-γ in pCR patients before chemotherapy were significantly higher than those in non-PCR group (P γ expression after neoadjuvant chemotherapy (P γ level before chemotherapy was an independent factor influencing the efficacy of neoadjuvant chemotherapy. Immunoinfiltration analysis showed that activated CD4 T cells, activated CD8 T cells, activated B cells, and natural killer cells were highly infiltrated in pCR patients. Conclusion: The expression of serum IL-12 and IFN-γ is correlated with the effect of neoadjuvant chemotherapy, and the high expression of serum IFN-γ before chemotherapy is an independent predictor of pCR.
基金supported by the National Natural Science Foundation of China(51879194)。
文摘In this paper,we propose a second-order moving-water equilibria preserving nonstaggered central scheme to solve the Ripa model via flux globalization.To maintain the moving-water steady states,we use the discrete source terms proposed by Britton et al.(J Sci Comput,2020,82(2):Art 30)by incorporating the expression of the source terms as a whole into the flux gradient,which directly avoids the discrete complexity of the source terms in order to maintain the well-balanced properties of the scheme.In addition,since the nonstaggered central scheme requires re-projecting the updated values of the nonstaggered cells onto the staggered cells,we modify the calculation of the global variables by constructing ghost cells and alternating the values of the global variables with the water depths obtained from the solution through the nonlinear relationship between the global flux and the water depth.In order to maintain the second-order accuracy of the scheme on the time scale,we incorporate a new Runge-Kutta type time discretization in the evolution of the numerical solution for the nonstaggered cells.Meanwhile,we introduce the"draining"time step technique to ensure that the water depth is positive and that it satisfies mass conservation.Numerical experiments verify that the scheme is well-balanced,positivity-preserving and robust.
