随着汽车的电子电气架构向域集中和区域集中方向发展,电子控制单元(Electronic Control Unit,ECU)需要更高的计算能力和更多样的接口,导致核心芯片的工作电压逐渐降低、工作速度加快、功耗增加,对车规微控制器单元(Microcontroller Unit...随着汽车的电子电气架构向域集中和区域集中方向发展,电子控制单元(Electronic Control Unit,ECU)需要更高的计算能力和更多样的接口,导致核心芯片的工作电压逐渐降低、工作速度加快、功耗增加,对车规微控制器单元(Microcontroller Unit,MCU)的性能提出了更高要求。文章提出一种基于目标阻抗的去耦设计方法,结合电容等效模型和电容去耦原理分析了0~50 MHz频率范围内电源分配网络(Power Distribution Network,PDN)的阻抗,通过Cadence Optimize PI电源完整性仿真软件对MCU核心电源进行仿真。结果表明,该方法设计的PDN能够满足芯片的电源需求,避免了过度设计,从而提高了开发效率。展开更多
片上集成光学模块具有集成小型化、低成本等优点,可在芯片尺度上实现“样品进、结果出”的即时定点检测。本文研制了一个工作波长为647 nm的荧光激发模块,集成聚合酶链式反应(PCR)生物微流控芯片和光电探测器,实现了片上荧光激发和病原...片上集成光学模块具有集成小型化、低成本等优点,可在芯片尺度上实现“样品进、结果出”的即时定点检测。本文研制了一个工作波长为647 nm的荧光激发模块,集成聚合酶链式反应(PCR)生物微流控芯片和光电探测器,实现了片上荧光激发和病原体核酸检测。该荧光激发模块主要由光栅和多模干涉器两个微纳器件构成,经有限时域差分法优化,光栅激发效率可达26.3%,多模干涉器损耗低至2.8%。结合生物微流控芯片,采用等浓度梯度的Cyanine 5 (Cy5)荧光素溶液对荧光激发模块性能进行验证,光电探测器输出电压值与Cy5荧光素溶液浓度之间成线性关系,拟合曲线方差为0.9944,最低检测下限为0.0625 µmol/L。利用200 copies/μL的新型冠状病毒质粒做生物应用测试,结果表明本文所提出的荧光激发模块能满足实际PCR应用中对荧光信号激发的要求。本系统在生物荧光定量PCR、数字PCR、蛋白等实时生物荧光检测方面具有应用前景。On-chip integrated optical modules have the advantages of integrated miniaturization, low cost, etc., and can realize “sample in, result out” real-time fixed-point detection on a chip scale. In this paper, a fluorescence excitation module with an operating wavelength of 647 nm was developed to achieve on-chip fluorescence excitation and pathogen nucleic acid detection by integrating a polymerase chain reaction (PCR) bio-microfluidic chip and a photodetector. The fluorescence excitation module is mainly composed of two micro-nano devices, grating and multimode interferometer (MMI). Optimized by the Finite-difference time-domain method, the grating excitation efficiency can reach 26.3%, and the multimode interferometer loss is as low as 2.8%. The performance of the fluorescence excitation module was verified by using an equal concentration gradient of Cyanine 5 (Cy5) fluorescein solution in combination with a bio-microfluidic chip. The output voltage value of the photodetector and the concentration of Cy5 fluorescein solution were linearly correlated with the variance of the fitted curve being 0.9944, and the lowest limit of detection being 0.0625 µmol/L. Biological application tests were performed with 200 copies/μL of the SARS-CoV-2 plasmid, and the results show that the fluorescence excitation module proposed in this paper can meet the requirements for fluorescence signal excitation in practical PCR applications. This module has promising applications in real-time biofluorescence detection of biofluorescence quantitative PCR, digital PCR, and proteins.展开更多
The global energy crisis and environmental problems have become two unprecedented challenges.Semi-conductor photocatalysis offers a promising strategy to solve them,while its practical application requires advanced ph...The global energy crisis and environmental problems have become two unprecedented challenges.Semi-conductor photocatalysis offers a promising strategy to solve them,while its practical application requires advanced photocatalytic materials.In recent years,one-dimensional(1D)alkali-metal hexatitanate(AHT)photocatalysts have attracted considerable attention in energy and environmental fields due to their high chemical stability,excellent photoactivity,unique ion-exchange,environment-friendly,and cost-effective properties.In this review,we firstly introduce the basic properties of AHT including crystal and electronic band structure,photoactivity,and structure-property-performance relationship.Secondly,the recent ad-vances in synthesis and modification strategies of 1D AHT photocatalysts are summarized thoughtfully,followed by a comprehensive discussion on their various environmental and energy applications,includ-ing pollutant degradation,H2 generation,and CO_(2)reduction.Finally,the key challenges and prospects are also highlighted for the development of high-performance 1D AHT-based photocatalysts for practi-cal applications.We hope that this review will shed some light on the rational design of 1D Ti-O-based nanomaterials for efficient environmental remediation and solar fuel production.展开更多
Sub-wavelength nanostructure lattices provide versatile platforms for light control and the basis for various novel phenomena and applications in physics, material science, chemistry, biology,and energy. The thriving ...Sub-wavelength nanostructure lattices provide versatile platforms for light control and the basis for various novel phenomena and applications in physics, material science, chemistry, biology,and energy. The thriving study of nanostructure lattices is building on the remarkable progress of nanofabrication techniques, especially for the possibility of fabricating larger-area patterns while achieving higher-quality lattices, complex shapes, and hybrid materials units. In this review, we present a comprehensive review of techniques for large-area fabrication of optical nanostructure arrays, encompassing direct writing, self-assembly, controllable deposition, and nanoimprint/print methods. Furthermore, a particular focus is made on the recent improvement of unit accuracy and diversity, leading to integrated and multifunctional structures for devices and applications.展开更多
为加速有限元分析流程,提出了一种面向有限元分析的自适应三角网格模型布尔运算方法。将ADT(alternating digital tree)数据结构应用于三角面片的判交计算,提升了布尔运算中三角面片的判交效率;借鉴结合球填充算法和插点/去点算法的网...为加速有限元分析流程,提出了一种面向有限元分析的自适应三角网格模型布尔运算方法。将ADT(alternating digital tree)数据结构应用于三角面片的判交计算,提升了布尔运算中三角面片的判交效率;借鉴结合球填充算法和插点/去点算法的网格重生成方法来重剖分局部区域,保证了算法的效率和生成网格的质量;通过改进的八叉树背景网格来记录和光滑尺寸场,生成了自适应的网格;通过尺寸场合理地控制重剖分区域,使算法效率和生成网格的质量得以很好地平衡。实验结果表明,所提方法可以高效地生成满足有限元分析需求的网格。展开更多
文摘随着汽车的电子电气架构向域集中和区域集中方向发展,电子控制单元(Electronic Control Unit,ECU)需要更高的计算能力和更多样的接口,导致核心芯片的工作电压逐渐降低、工作速度加快、功耗增加,对车规微控制器单元(Microcontroller Unit,MCU)的性能提出了更高要求。文章提出一种基于目标阻抗的去耦设计方法,结合电容等效模型和电容去耦原理分析了0~50 MHz频率范围内电源分配网络(Power Distribution Network,PDN)的阻抗,通过Cadence Optimize PI电源完整性仿真软件对MCU核心电源进行仿真。结果表明,该方法设计的PDN能够满足芯片的电源需求,避免了过度设计,从而提高了开发效率。
文摘片上集成光学模块具有集成小型化、低成本等优点,可在芯片尺度上实现“样品进、结果出”的即时定点检测。本文研制了一个工作波长为647 nm的荧光激发模块,集成聚合酶链式反应(PCR)生物微流控芯片和光电探测器,实现了片上荧光激发和病原体核酸检测。该荧光激发模块主要由光栅和多模干涉器两个微纳器件构成,经有限时域差分法优化,光栅激发效率可达26.3%,多模干涉器损耗低至2.8%。结合生物微流控芯片,采用等浓度梯度的Cyanine 5 (Cy5)荧光素溶液对荧光激发模块性能进行验证,光电探测器输出电压值与Cy5荧光素溶液浓度之间成线性关系,拟合曲线方差为0.9944,最低检测下限为0.0625 µmol/L。利用200 copies/μL的新型冠状病毒质粒做生物应用测试,结果表明本文所提出的荧光激发模块能满足实际PCR应用中对荧光信号激发的要求。本系统在生物荧光定量PCR、数字PCR、蛋白等实时生物荧光检测方面具有应用前景。On-chip integrated optical modules have the advantages of integrated miniaturization, low cost, etc., and can realize “sample in, result out” real-time fixed-point detection on a chip scale. In this paper, a fluorescence excitation module with an operating wavelength of 647 nm was developed to achieve on-chip fluorescence excitation and pathogen nucleic acid detection by integrating a polymerase chain reaction (PCR) bio-microfluidic chip and a photodetector. The fluorescence excitation module is mainly composed of two micro-nano devices, grating and multimode interferometer (MMI). Optimized by the Finite-difference time-domain method, the grating excitation efficiency can reach 26.3%, and the multimode interferometer loss is as low as 2.8%. The performance of the fluorescence excitation module was verified by using an equal concentration gradient of Cyanine 5 (Cy5) fluorescein solution in combination with a bio-microfluidic chip. The output voltage value of the photodetector and the concentration of Cy5 fluorescein solution were linearly correlated with the variance of the fitted curve being 0.9944, and the lowest limit of detection being 0.0625 µmol/L. Biological application tests were performed with 200 copies/μL of the SARS-CoV-2 plasmid, and the results show that the fluorescence excitation module proposed in this paper can meet the requirements for fluorescence signal excitation in practical PCR applications. This module has promising applications in real-time biofluorescence detection of biofluorescence quantitative PCR, digital PCR, and proteins.
基金acknowledge the financial support pro-vided by the National Natural Science Foundation of China(No.52204323)the Strategic Priority Research Program(B)of the Chinese Academy of Sciences(No.E2XBRD1001).
文摘The global energy crisis and environmental problems have become two unprecedented challenges.Semi-conductor photocatalysis offers a promising strategy to solve them,while its practical application requires advanced photocatalytic materials.In recent years,one-dimensional(1D)alkali-metal hexatitanate(AHT)photocatalysts have attracted considerable attention in energy and environmental fields due to their high chemical stability,excellent photoactivity,unique ion-exchange,environment-friendly,and cost-effective properties.In this review,we firstly introduce the basic properties of AHT including crystal and electronic band structure,photoactivity,and structure-property-performance relationship.Secondly,the recent ad-vances in synthesis and modification strategies of 1D AHT photocatalysts are summarized thoughtfully,followed by a comprehensive discussion on their various environmental and energy applications,includ-ing pollutant degradation,H2 generation,and CO_(2)reduction.Finally,the key challenges and prospects are also highlighted for the development of high-performance 1D AHT-based photocatalysts for practi-cal applications.We hope that this review will shed some light on the rational design of 1D Ti-O-based nanomaterials for efficient environmental remediation and solar fuel production.
基金National Natural Science Foundation of China (No. 62275257)startup funding from the Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciencesthe support of the Russian Science Foundation (No. 22-13-00126)。
文摘Sub-wavelength nanostructure lattices provide versatile platforms for light control and the basis for various novel phenomena and applications in physics, material science, chemistry, biology,and energy. The thriving study of nanostructure lattices is building on the remarkable progress of nanofabrication techniques, especially for the possibility of fabricating larger-area patterns while achieving higher-quality lattices, complex shapes, and hybrid materials units. In this review, we present a comprehensive review of techniques for large-area fabrication of optical nanostructure arrays, encompassing direct writing, self-assembly, controllable deposition, and nanoimprint/print methods. Furthermore, a particular focus is made on the recent improvement of unit accuracy and diversity, leading to integrated and multifunctional structures for devices and applications.
文摘为加速有限元分析流程,提出了一种面向有限元分析的自适应三角网格模型布尔运算方法。将ADT(alternating digital tree)数据结构应用于三角面片的判交计算,提升了布尔运算中三角面片的判交效率;借鉴结合球填充算法和插点/去点算法的网格重生成方法来重剖分局部区域,保证了算法的效率和生成网格的质量;通过改进的八叉树背景网格来记录和光滑尺寸场,生成了自适应的网格;通过尺寸场合理地控制重剖分区域,使算法效率和生成网格的质量得以很好地平衡。实验结果表明,所提方法可以高效地生成满足有限元分析需求的网格。
