Defective phononic crystals(PnCs)have enabled spatial localization and quantitative amplification of elastic wave energy.Most previous research has focused on applications such as narrow-bandpass filters,ultrasonic se...Defective phononic crystals(PnCs)have enabled spatial localization and quantitative amplification of elastic wave energy.Most previous research has focused on applications such as narrow-bandpass filters,ultrasonic sensors,and piezoelectric energy harvesters,typically operating under the assumption of an external elastic wave incidence.Recently,a novel approach that uses defective PnCs as ultrasonic actuators to generate amplified waves has emerged.However,the existing studies are limited to the generation of either longitudinal or bending waves,with no research addressing the concurrent generation of both.Hence,this paper proposes a straightforward methodology for the concurrent generation and amplification of both wave types utilizing defect modes at independent defect-band frequencies.Bimorph piezoelectric elements are attached to the defect,with each element connected to independent external voltage sources.By precisely adjusting the magnitude and temporal phase differences between the voltage sources,concurrently amplified wave generation is achieved.The paper highlights the advantages of the proposed analytical model.This model is both computationally time-efficient and accurate,in comparison with the COMSOL simulation results.For instance,in case studies,the analytical model reduces the computational time from one hour to mere seconds,while maintaining acceptable error rates of 1%in peak frequencies.This concurrent wave-generation methodology opens new avenues for applications in rotating machinery fault diagnosis,structural health monitoring,and medical imaging.展开更多
The antiepileptic effect of pinellia total alkaloids（PTA） on penicillin（PNC） chronically kindled rats was investigated. We investigated the effects of PTA on Glu,Asp,Gly andγ-aminobutyric acid（GABA） concentrati...The antiepileptic effect of pinellia total alkaloids（PTA） on penicillin（PNC） chronically kindled rats was investigated. We investigated the effects of PTA on Glu,Asp,Gly andγ-aminobutyric acid（GABA） concentrations and the expression level of cerebral GABA_A receptor in hippocampus.The influence of PTA on epilepsy seizure latency and degree in PNC chronically kindled rats were observed.High performance liquid chromatography（HPLC） was adopted to measure the concentrations of Glu, Asp,Gly and GABA in hippocampus. Reverse transcriptase-polymerase chain reaction （RT-PCR） was used to determine the expression of cerebral GABAA receptor mRNA. Compared with normal rats, the levels of GABA and Gly decreased obviously while the level of Glu and Asp increased significantly in model rats. The cerebral GABAA receptor mRNA level was also decreased at the same time. The difference was statistically different compared to the control group. PTA could prolong the latent period of the penicillin induced seizure and weaken the extent of seizure, compared with the model group without PTA treatment. Moreover, PTA increased the level of GABA and the expression level of GABAA receptor, while decreased the level of Glu significantly. However, it had no obvious effect on the level of Gly and Asp. Pre-treatment of PTA can also increase the GABAA receptor mRNA level. In conclusion, PTA could alleviate the PNC chronically kindled rat seizure. It increased the GABA level and the expression of GABAA receptor, and it decreased the Glu concentration.展开更多
Perovskite has received extensive attention due to its excellent properties, just like photoelectric, while the instability has always troubled us to the wide application of perovskite materials. Herein, we proposed t...Perovskite has received extensive attention due to its excellent properties, just like photoelectric, while the instability has always troubled us to the wide application of perovskite materials. Herein, we proposed to use SiO_(2)and POE to encapsulate perovskite nanocrystals(PNCs). In this work, we have successfully prepared a series of perovskite composite materials and films with different concentration ratios.Due to the protection of POE, the luminous intensity of CsPbBr_(3)@POE composite film remained above 90% after stayed in the water for 42 days. The lead concentration of CsPbBr_(3)@POE composite film was 0.8 μg/m L after 48 h of immersing in deionized water. Namely, packaging PNCs in POE could effectively prevent Pb from overflowing reduce Pb pollution. Besides, the composite films showed a wide colour gamut with 117% of NTSC colour gamut, which shows that this composite material has a development prospect in the WLED field.展开更多
目的初步构建基于工作流理念的患者报告结局测量信息系统中国中心(Patient‑reported Outcomes Measurement Information System National Center‑China,PNC‑China)信息化管理系统,优化PNCChina的管理流程。方法通过质性访谈了解PNC‑Chin...目的初步构建基于工作流理念的患者报告结局测量信息系统中国中心(Patient‑reported Outcomes Measurement Information System National Center‑China,PNC‑China)信息化管理系统,优化PNCChina的管理流程。方法通过质性访谈了解PNC‑China工作人员对信息化管理系统的构建需求及功能设想;结合工作流理论的三大要素,构建PNC‑China信息化管理系统初步框架。结果通过质性访谈归纳提炼出PNC‑China信息化管理需求的三大主题,即相关工作流程繁琐,急需信息化工具辅助;文件管理工具较落后,急需实现系统化、信息化管理;合作管理欠规范,急需实现标准化。结合需求及功能设想,构建出PNC‑China信息化管理系统的3个功能框架,即PROMIS中文版翻译工作流程框架、临床检验工作流程框架及临床应用工作流程框架。结论基于工作流理念,贴合PNC‑China工作内容和流程构建的信息化管理系统框架,将有助于推动我国患者报告结局测量信息系统的相关研究和临床实践。展开更多
The existing physical-layer network coding(PNC) can be grouped into three generic schemes,which are XOR-based PNC,superposition-based PNC,and denoising-and-forward(DNFbased) PNC.Generally speaking,DNF-based PNC has be...The existing physical-layer network coding(PNC) can be grouped into three generic schemes,which are XOR-based PNC,superposition-based PNC,and denoising-and-forward(DNFbased) PNC.Generally speaking,DNF-based PNC has better performance of rate pair region compared with the other two schemes when the transmission is symmetric.When the transmission is asymmetric,its performance is degraded severely.However,superposition-based PNC does not have that limitation even if its rate pair region performance is inferior to that of DNF-based PNC and XOR-based PNC.In this paper,we focus on the combined use of the two PNC schemes,superposition-based PNC and DNFbased PNC,and present a novel PNC scheme called joint superposition and DNF physical-layer network coding(JSDNF-based PNC) as well as the information theory analysis of the achievable rate pair region.At the same time,in the proposed scheme,an adaptive power allocation factor is introduced.By changing the power factor,the system can adapt its rate pair region flexibly.The numerical results show that the proposed scheme achieves the largest rate pair region when the rate difference of two source signals is very large.At the same time,the support on asymmetric transmission is also an important profit of the scheme.展开更多
基金supported by the Basic Science Research Program through the National Research Foundation of Korea,funded by the Ministry of Education(No.2022R1I1A1A01056406)。
文摘Defective phononic crystals(PnCs)have enabled spatial localization and quantitative amplification of elastic wave energy.Most previous research has focused on applications such as narrow-bandpass filters,ultrasonic sensors,and piezoelectric energy harvesters,typically operating under the assumption of an external elastic wave incidence.Recently,a novel approach that uses defective PnCs as ultrasonic actuators to generate amplified waves has emerged.However,the existing studies are limited to the generation of either longitudinal or bending waves,with no research addressing the concurrent generation of both.Hence,this paper proposes a straightforward methodology for the concurrent generation and amplification of both wave types utilizing defect modes at independent defect-band frequencies.Bimorph piezoelectric elements are attached to the defect,with each element connected to independent external voltage sources.By precisely adjusting the magnitude and temporal phase differences between the voltage sources,concurrently amplified wave generation is achieved.The paper highlights the advantages of the proposed analytical model.This model is both computationally time-efficient and accurate,in comparison with the COMSOL simulation results.For instance,in case studies,the analytical model reduces the computational time from one hour to mere seconds,while maintaining acceptable error rates of 1%in peak frequencies.This concurrent wave-generation methodology opens new avenues for applications in rotating machinery fault diagnosis,structural health monitoring,and medical imaging.
基金Natural Science Foundation of Shanxi Province (Grant No.20041109).
文摘The antiepileptic effect of pinellia total alkaloids（PTA） on penicillin（PNC） chronically kindled rats was investigated. We investigated the effects of PTA on Glu,Asp,Gly andγ-aminobutyric acid（GABA） concentrations and the expression level of cerebral GABA_A receptor in hippocampus.The influence of PTA on epilepsy seizure latency and degree in PNC chronically kindled rats were observed.High performance liquid chromatography（HPLC） was adopted to measure the concentrations of Glu, Asp,Gly and GABA in hippocampus. Reverse transcriptase-polymerase chain reaction （RT-PCR） was used to determine the expression of cerebral GABAA receptor mRNA. Compared with normal rats, the levels of GABA and Gly decreased obviously while the level of Glu and Asp increased significantly in model rats. The cerebral GABAA receptor mRNA level was also decreased at the same time. The difference was statistically different compared to the control group. PTA could prolong the latent period of the penicillin induced seizure and weaken the extent of seizure, compared with the model group without PTA treatment. Moreover, PTA increased the level of GABA and the expression level of GABAA receptor, while decreased the level of Glu significantly. However, it had no obvious effect on the level of Gly and Asp. Pre-treatment of PTA can also increase the GABAA receptor mRNA level. In conclusion, PTA could alleviate the PNC chronically kindled rat seizure. It increased the GABA level and the expression of GABAA receptor, and it decreased the Glu concentration.
文摘本文讨论蒙特卡洛(Monte Carlo)法的基本概念和应用。从正态概率分布等函数产生的随机数可以简易地在Excel工作表上产生。基于Excel的蒙特卡洛模拟可以避免编制复杂的Visual BASIC程序。工程设计方面蒙特卡洛法的实例应用表明,在Excel上通过蒙特卡洛模拟对设计参数作出概率分析,并计算PNC(Probability of Non-Compliance,“不符合”概率)简单易行。而愈简易的技术,其技术内涵不一定低,但生命力却较强。
基金supported by the National Natural Science Foundation of China(51872207,52072271)。
文摘Perovskite has received extensive attention due to its excellent properties, just like photoelectric, while the instability has always troubled us to the wide application of perovskite materials. Herein, we proposed to use SiO_(2)and POE to encapsulate perovskite nanocrystals(PNCs). In this work, we have successfully prepared a series of perovskite composite materials and films with different concentration ratios.Due to the protection of POE, the luminous intensity of CsPbBr_(3)@POE composite film remained above 90% after stayed in the water for 42 days. The lead concentration of CsPbBr_(3)@POE composite film was 0.8 μg/m L after 48 h of immersing in deionized water. Namely, packaging PNCs in POE could effectively prevent Pb from overflowing reduce Pb pollution. Besides, the composite films showed a wide colour gamut with 117% of NTSC colour gamut, which shows that this composite material has a development prospect in the WLED field.
文摘目的初步构建基于工作流理念的患者报告结局测量信息系统中国中心(Patient‑reported Outcomes Measurement Information System National Center‑China,PNC‑China)信息化管理系统,优化PNCChina的管理流程。方法通过质性访谈了解PNC‑China工作人员对信息化管理系统的构建需求及功能设想;结合工作流理论的三大要素,构建PNC‑China信息化管理系统初步框架。结果通过质性访谈归纳提炼出PNC‑China信息化管理需求的三大主题,即相关工作流程繁琐,急需信息化工具辅助;文件管理工具较落后,急需实现系统化、信息化管理;合作管理欠规范,急需实现标准化。结合需求及功能设想,构建出PNC‑China信息化管理系统的3个功能框架,即PROMIS中文版翻译工作流程框架、临床检验工作流程框架及临床应用工作流程框架。结论基于工作流理念,贴合PNC‑China工作内容和流程构建的信息化管理系统框架,将有助于推动我国患者报告结局测量信息系统的相关研究和临床实践。
基金supported in part by National Natural Science Foundation of China under Grant No. 61071090Postgraduate Innovation Program of Scientific Research of Jiangsu Province under Grant No. CX10B -184Z
文摘The existing physical-layer network coding(PNC) can be grouped into three generic schemes,which are XOR-based PNC,superposition-based PNC,and denoising-and-forward(DNFbased) PNC.Generally speaking,DNF-based PNC has better performance of rate pair region compared with the other two schemes when the transmission is symmetric.When the transmission is asymmetric,its performance is degraded severely.However,superposition-based PNC does not have that limitation even if its rate pair region performance is inferior to that of DNF-based PNC and XOR-based PNC.In this paper,we focus on the combined use of the two PNC schemes,superposition-based PNC and DNFbased PNC,and present a novel PNC scheme called joint superposition and DNF physical-layer network coding(JSDNF-based PNC) as well as the information theory analysis of the achievable rate pair region.At the same time,in the proposed scheme,an adaptive power allocation factor is introduced.By changing the power factor,the system can adapt its rate pair region flexibly.The numerical results show that the proposed scheme achieves the largest rate pair region when the rate difference of two source signals is very large.At the same time,the support on asymmetric transmission is also an important profit of the scheme.
