某一特定场地的岩土力学参数在地质作用下普遍呈现固有的不确定性,融合现场观测数据进行概率反分析可有效缩减这一不确定性。虽然基于子集模拟的贝叶斯更新(Bayesian Updating with Subset simulation,简称BUS)方法可以将等量场地信息...某一特定场地的岩土力学参数在地质作用下普遍呈现固有的不确定性,融合现场观测数据进行概率反分析可有效缩减这一不确定性。虽然基于子集模拟的贝叶斯更新(Bayesian Updating with Subset simulation,简称BUS)方法可以将等量场地信息的高维概率反分析问题转化为等效的结构可靠度问题,但是当现场观测数据增多时,构建的似然函数值会变得非常小,甚至低于计算机浮点运算精度,会严重影响概率反分析计算效率与精度。为此,提出了一种基于并联系统可靠度分析的改进BUS方法,从基于乔列斯基分解的中点法出发,将接受率低的总失效区域分解为多个接受率高的子失效区域,从而避免因融合大量现场观测数据引起的“维度灾难”问题,实现对边坡岩土力学参数的准确概率反分析。最后,通过一不排水饱和黏土边坡案例验证了提出方法的有效性,结果表明提出的方法能够融合大量钻孔数据和边坡服役状态等观测信息高效进行岩土力学参数概率反分析及边坡可靠度评估,为高维空间变异参数概率反分析和边坡可靠度评估提供了一种有效的工具。展开更多
为提升家用雾化制氧机的用户体验及满意度,提出结合用户体验模型,采用半结构化访谈方式归纳用户需求并建立评价层级体系;采用序关系分析法进行需求指标权重计算及优度排序;通过功能分析系统技术(Function Analysis System Technique,FA...为提升家用雾化制氧机的用户体验及满意度,提出结合用户体验模型,采用半结构化访谈方式归纳用户需求并建立评价层级体系;采用序关系分析法进行需求指标权重计算及优度排序;通过功能分析系统技术(Function Analysis System Technique,FAST)功能树获取产品功能要素,指导设计方案输出;采用模糊综合评价(Fuzzy Comprehensive Evaluation,FCE)法对产品设计方案进行用户满意度评价。研究结果表明:基于序关系分析法和FCE法设计的家用雾化制氧机具有较高的用户满意度,设计方法的集成提升了用户需求获取与方案评价环节的效率及科学性,可为同类产品的创新设计提供参考。展开更多
We propose a frequency-tunable router of single photons with high routing efficiency, which is constructed by two waveguides mediately linked by a single-mode whispering gallery resonator with a driven three-level emi...We propose a frequency-tunable router of single photons with high routing efficiency, which is constructed by two waveguides mediately linked by a single-mode whispering gallery resonator with a driven three-level emitter. Quantum routing probability in the output port is obtained via the real-space Hamiltonian. By adjusting the resonator–emitter coupling and the drive, the desired continuous central frequencies for the resonance peaks of routing photons can be manipulated nearly linearly, with the assistance of Rabi splitting effect and optical Stark shift. The proposed routing system may provide potential applications in designing other frequency-modulation quantum optical devices, such as multiplexers,filters, and so on.展开更多
We theoretically investigate coherent scattering of single photons and quantum entanglement of two giant atoms with azimuthal angle differences in a waveguide system.Using the real-space Hamiltonian,analytical express...We theoretically investigate coherent scattering of single photons and quantum entanglement of two giant atoms with azimuthal angle differences in a waveguide system.Using the real-space Hamiltonian,analytical expressions are derived for the transport spectra scattered by these two giant atoms with four azimuthal angles.Fano-like resonance can be exhibited in the scattering spectra by adjusting the azimuthal angle difference.High concurrence of the entangled state for two atoms can be implemented in a wide angle-difference range,and the entanglement of the atomic states can be switched on/off by modulating the additional azimuthal angle differences from the giant atoms.This suggests a novel handle to effectively control the single-photon scattering and quantum entanglement.展开更多
目的分析心脏移植受者术后发生高钾血症的预后、危险因素及其预测指标。方法回顾性分析158例受者的临床资料,根据受者术后随访1年内的血钾水平分为正常血钾组(83例)、高钾血症组(43例)及重度高钾血症组(32例)。总结心脏移植术后高钾血...目的分析心脏移植受者术后发生高钾血症的预后、危险因素及其预测指标。方法回顾性分析158例受者的临床资料,根据受者术后随访1年内的血钾水平分为正常血钾组(83例)、高钾血症组(43例)及重度高钾血症组(32例)。总结心脏移植术后高钾血症的发生情况及预后,分析心脏移植术后高钾血症的危险因素及预测指标。结果心脏移植术后1年高钾血症发生率为47.5%(75/158),重度高钾血症发生率20.3%(32/158)。重度高钾血症组的病死率为16%(5/32),高于正常血钾组的8%(7/83)和高钾血症组的7%(3/43)。术前半年血清肌酐(Scr)平均值、术前末次总胆红素、术后血液透析时间、术后1 d Scr及术后1 d脑钠肽前体是心脏移植术后发生高钾血症的独立危险因素(均为P<0.05)。术前半年Scr平均值、术后血液透析时间和术后1 d Scr、术后7 d Scr可预测术后重度高钾血症。结论心脏移植术后重度高钾血症的结局欠佳,心脏移植术后发生高钾血症的独立危险因素包括术前半年Scr平均值、术前末次总胆红素、术后血液透析时间、术后1 d Scr及术后1 d脑钠肽前体,围手术期Scr及术后血液透析时间可预测心脏移植术后1年内重度高钾血症。展开更多
文摘某一特定场地的岩土力学参数在地质作用下普遍呈现固有的不确定性,融合现场观测数据进行概率反分析可有效缩减这一不确定性。虽然基于子集模拟的贝叶斯更新(Bayesian Updating with Subset simulation,简称BUS)方法可以将等量场地信息的高维概率反分析问题转化为等效的结构可靠度问题,但是当现场观测数据增多时,构建的似然函数值会变得非常小,甚至低于计算机浮点运算精度,会严重影响概率反分析计算效率与精度。为此,提出了一种基于并联系统可靠度分析的改进BUS方法,从基于乔列斯基分解的中点法出发,将接受率低的总失效区域分解为多个接受率高的子失效区域,从而避免因融合大量现场观测数据引起的“维度灾难”问题,实现对边坡岩土力学参数的准确概率反分析。最后,通过一不排水饱和黏土边坡案例验证了提出方法的有效性,结果表明提出的方法能够融合大量钻孔数据和边坡服役状态等观测信息高效进行岩土力学参数概率反分析及边坡可靠度评估,为高维空间变异参数概率反分析和边坡可靠度评估提供了一种有效的工具。
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 12365003, 12364024, and 11864014)the Natural Science Foundation of Jiangxi Province, China (Grant Nos. 20212BAB201014 and 20224BAB201023)。
文摘We propose a frequency-tunable router of single photons with high routing efficiency, which is constructed by two waveguides mediately linked by a single-mode whispering gallery resonator with a driven three-level emitter. Quantum routing probability in the output port is obtained via the real-space Hamiltonian. By adjusting the resonator–emitter coupling and the drive, the desired continuous central frequencies for the resonance peaks of routing photons can be manipulated nearly linearly, with the assistance of Rabi splitting effect and optical Stark shift. The proposed routing system may provide potential applications in designing other frequency-modulation quantum optical devices, such as multiplexers,filters, and so on.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.12365003,12364024,and 11864014)the Jiangxi Provincial Natural Science Foundation(Grant Nos.20212BAB201014 and 20224BAB201023)。
文摘We theoretically investigate coherent scattering of single photons and quantum entanglement of two giant atoms with azimuthal angle differences in a waveguide system.Using the real-space Hamiltonian,analytical expressions are derived for the transport spectra scattered by these two giant atoms with four azimuthal angles.Fano-like resonance can be exhibited in the scattering spectra by adjusting the azimuthal angle difference.High concurrence of the entangled state for two atoms can be implemented in a wide angle-difference range,and the entanglement of the atomic states can be switched on/off by modulating the additional azimuthal angle differences from the giant atoms.This suggests a novel handle to effectively control the single-photon scattering and quantum entanglement.
文摘目的分析心脏移植受者术后发生高钾血症的预后、危险因素及其预测指标。方法回顾性分析158例受者的临床资料,根据受者术后随访1年内的血钾水平分为正常血钾组(83例)、高钾血症组(43例)及重度高钾血症组(32例)。总结心脏移植术后高钾血症的发生情况及预后,分析心脏移植术后高钾血症的危险因素及预测指标。结果心脏移植术后1年高钾血症发生率为47.5%(75/158),重度高钾血症发生率20.3%(32/158)。重度高钾血症组的病死率为16%(5/32),高于正常血钾组的8%(7/83)和高钾血症组的7%(3/43)。术前半年血清肌酐(Scr)平均值、术前末次总胆红素、术后血液透析时间、术后1 d Scr及术后1 d脑钠肽前体是心脏移植术后发生高钾血症的独立危险因素(均为P<0.05)。术前半年Scr平均值、术后血液透析时间和术后1 d Scr、术后7 d Scr可预测术后重度高钾血症。结论心脏移植术后重度高钾血症的结局欠佳,心脏移植术后发生高钾血症的独立危险因素包括术前半年Scr平均值、术前末次总胆红素、术后血液透析时间、术后1 d Scr及术后1 d脑钠肽前体,围手术期Scr及术后血液透析时间可预测心脏移植术后1年内重度高钾血症。
