2022年,上海梅山钢铁股份有限公司焦炉煤气脱硫脱氰(desulfurization and decyanation sorbent,DDS)生物脱硫技术项目成功建设并投入运行。基于此,概述DDS生物脱硫技术的技术核心、技术原理、工艺流程及现场布置,深入分析DDS生物脱硫技...2022年,上海梅山钢铁股份有限公司焦炉煤气脱硫脱氰(desulfurization and decyanation sorbent,DDS)生物脱硫技术项目成功建设并投入运行。基于此,概述DDS生物脱硫技术的技术核心、技术原理、工艺流程及现场布置,深入分析DDS生物脱硫技术的实际应用与优化、应用效果及应用前景,对项目建设及运行过程中出现的问题进行分析、总结与完善,以期提高企业自身的技术水平,并为其他企业选择煤气脱硫工艺提供了参考。展开更多
The study of nonlinear optical responses in the mid-infrared(mid-IR)regime is essential for advancing ultrafast mid-IR laser applications.However,nonlinear optical effects under mid-IR excitation are rarely reported d...The study of nonlinear optical responses in the mid-infrared(mid-IR)regime is essential for advancing ultrafast mid-IR laser applications.However,nonlinear optical effects under mid-IR excitation are rarely reported due to the lack of suitable nonlinear optical materials.The natural van derWaals heterostructure franckeite,known for its narrow bandgap and stability in air,shows great potential for developing mid-IR nonlinear optical devices.We have experimentally demonstrated that layered franckeite exhibits a broadband wavelength-dependent nonlinear optical response in the mid-IR spectral region.Franckeite nanosheets were prepared using a liquid-phase exfoliation method,and their nonlinear optical response was characterized in the spectral range of 3000 nm to 5000 nm.The franckeite nanosheets exhibit broadband wavelengthdependent third-order nonlinearities,with nonlinear absorption and refraction coefficients estimated to be about 10^(-7)cm/W and 10^(-11)cm^(2)/W,respectively.Additionally,a passively Q-switched fluoride fiber laser operating around a wavelength of 2800 nm was achieved,delivering nanosecond pulses with a signal-to-noise ratio of 43.6 dB,based on the nonlinear response of franckeite.These findings indicate that layered franckeite possesses broadband nonlinear optical characteristics in the mid-IR region,potentially enabling new possibilities for mid-IR photonic devices.展开更多
We demonstrate a highly compact third-order elliptical micro-ring add-drop filter based on a silicon-on-insulator wafer. The elliptical micro-ring resonator has a major radius of 6μm （minor radius of 4.112μm） and ...We demonstrate a highly compact third-order elliptical micro-ring add-drop filter based on a silicon-on-insulator wafer. The elliptical micro-ring resonator has a major radius of 6μm （minor radius of 4.112μm） and a large free spectral range of 18 nm. Experimental results show a box-like channel dropping response, which has a 3 dB bandwidth of -2.7nm, high out-of-band signal rejection of around 40dB and a very low drop loss （〈0.5dB）. Simulation agrees well with the experiments. The footprint of the whole chip is only 0.0003mm2.展开更多
为实现分布式系统中多个设备的热备份,提出了一种分布式系统的热备份方法。通过以太网和DDS(Data Distribution Service,数据分发服务)中间件技术,使得分布式系统中所有设备节点能够动态地发现彼此,根据主题、数据类型及服务质量策略进...为实现分布式系统中多个设备的热备份,提出了一种分布式系统的热备份方法。通过以太网和DDS(Data Distribution Service,数据分发服务)中间件技术,使得分布式系统中所有设备节点能够动态地发现彼此,根据主题、数据类型及服务质量策略进行匹配,只有匹配成功后才会建立通信连接。一旦检测到系统中某个设备节点不可用时,用其他设备节点替换当前故障的设备节点,重新匹配和建立通信连接,从而实现设备节点的热备份。此方法不需要采用仲裁机构,易于实现,具有成本低、可靠性高、多机间相互热备份等优点,降低了分布式系统的冗余度,最大限度保证了分布式系统网络的实时性、可用性和可靠性。展开更多
This paper is devoted to find the numerical solutions of one dimensional general nonlinear system of third-order boundary value problems (BVPs) for the pair of functions using Galerkin weighted residual method. We der...This paper is devoted to find the numerical solutions of one dimensional general nonlinear system of third-order boundary value problems (BVPs) for the pair of functions using Galerkin weighted residual method. We derive mathematical formulations in matrix form, in detail, by exploiting Bernstein polynomials as basis functions. A reasonable accuracy is found when the proposed method is used on few examples. At the end of the study, a comparison is made between the approximate and exact solutions, and also with the solutions of the existing methods. Our results converge monotonically to the exact solutions. In addition, we show that the derived formulations may be applicable by reducing higher order complicated BVP into a lower order system of BVPs, and the performance of the numerical solutions is satisfactory. .展开更多
为解决超声波驱动电源存在激励信号单一、频率范围窄、专机专用等问题,结合DDS技术的优点以及FPGA的可编程性的特点,提出了一种以FPGA为控制核心,基于DDS技术的可以通用的超声波驱动电源的设计方案。设计的超声波驱动电源可以产生正弦...为解决超声波驱动电源存在激励信号单一、频率范围窄、专机专用等问题,结合DDS技术的优点以及FPGA的可编程性的特点,提出了一种以FPGA为控制核心,基于DDS技术的可以通用的超声波驱动电源的设计方案。设计的超声波驱动电源可以产生正弦波、三角波、方波、锯齿波4种激励信号,并通过对DDS频率控制字的调整可以有效实现频率在20 k Hz^1 MHz范围内任意可调,利用可编程增益放大器AD8250结合分段放大算法实现了电源功率的方法与可调。经仿真实验验证设计的超声波驱动电源可以实现波形可选、频率可调、功率可调的功能,能有效驱动应用于超声波精密测量领域的超声波换能器。展开更多
文摘2022年,上海梅山钢铁股份有限公司焦炉煤气脱硫脱氰(desulfurization and decyanation sorbent,DDS)生物脱硫技术项目成功建设并投入运行。基于此,概述DDS生物脱硫技术的技术核心、技术原理、工艺流程及现场布置,深入分析DDS生物脱硫技术的实际应用与优化、应用效果及应用前景,对项目建设及运行过程中出现的问题进行分析、总结与完善,以期提高企业自身的技术水平,并为其他企业选择煤气脱硫工艺提供了参考。
基金supported by the National Natural Science Foundation of China(Grant No.61975055)the Natural Science Foundation of Hunan Province,China(Grant No.2023JJ30165)+1 种基金the Natural Science Foundation of Shandong Province,China(Grant No.ZR2022QF005)the Doctoral Fund of University of Heze(Grant No.XY22BS14).
文摘The study of nonlinear optical responses in the mid-infrared(mid-IR)regime is essential for advancing ultrafast mid-IR laser applications.However,nonlinear optical effects under mid-IR excitation are rarely reported due to the lack of suitable nonlinear optical materials.The natural van derWaals heterostructure franckeite,known for its narrow bandgap and stability in air,shows great potential for developing mid-IR nonlinear optical devices.We have experimentally demonstrated that layered franckeite exhibits a broadband wavelength-dependent nonlinear optical response in the mid-IR spectral region.Franckeite nanosheets were prepared using a liquid-phase exfoliation method,and their nonlinear optical response was characterized in the spectral range of 3000 nm to 5000 nm.The franckeite nanosheets exhibit broadband wavelengthdependent third-order nonlinearities,with nonlinear absorption and refraction coefficients estimated to be about 10^(-7)cm/W and 10^(-11)cm^(2)/W,respectively.Additionally,a passively Q-switched fluoride fiber laser operating around a wavelength of 2800 nm was achieved,delivering nanosecond pulses with a signal-to-noise ratio of 43.6 dB,based on the nonlinear response of franckeite.These findings indicate that layered franckeite possesses broadband nonlinear optical characteristics in the mid-IR region,potentially enabling new possibilities for mid-IR photonic devices.
基金Supported by the National High Technology Research and Development Program of China under Grant No 2015AA016904the National Key Research and Development Plan of China under Grant No 2016YFB0402502the National Natural Science Foundation of China under Grant No 61275065
文摘We demonstrate a highly compact third-order elliptical micro-ring add-drop filter based on a silicon-on-insulator wafer. The elliptical micro-ring resonator has a major radius of 6μm （minor radius of 4.112μm） and a large free spectral range of 18 nm. Experimental results show a box-like channel dropping response, which has a 3 dB bandwidth of -2.7nm, high out-of-band signal rejection of around 40dB and a very low drop loss （〈0.5dB）. Simulation agrees well with the experiments. The footprint of the whole chip is only 0.0003mm2.
文摘为实现分布式系统中多个设备的热备份,提出了一种分布式系统的热备份方法。通过以太网和DDS(Data Distribution Service,数据分发服务)中间件技术,使得分布式系统中所有设备节点能够动态地发现彼此,根据主题、数据类型及服务质量策略进行匹配,只有匹配成功后才会建立通信连接。一旦检测到系统中某个设备节点不可用时,用其他设备节点替换当前故障的设备节点,重新匹配和建立通信连接,从而实现设备节点的热备份。此方法不需要采用仲裁机构,易于实现,具有成本低、可靠性高、多机间相互热备份等优点,降低了分布式系统的冗余度,最大限度保证了分布式系统网络的实时性、可用性和可靠性。
文摘This paper is devoted to find the numerical solutions of one dimensional general nonlinear system of third-order boundary value problems (BVPs) for the pair of functions using Galerkin weighted residual method. We derive mathematical formulations in matrix form, in detail, by exploiting Bernstein polynomials as basis functions. A reasonable accuracy is found when the proposed method is used on few examples. At the end of the study, a comparison is made between the approximate and exact solutions, and also with the solutions of the existing methods. Our results converge monotonically to the exact solutions. In addition, we show that the derived formulations may be applicable by reducing higher order complicated BVP into a lower order system of BVPs, and the performance of the numerical solutions is satisfactory. .
文摘为解决超声波驱动电源存在激励信号单一、频率范围窄、专机专用等问题,结合DDS技术的优点以及FPGA的可编程性的特点,提出了一种以FPGA为控制核心,基于DDS技术的可以通用的超声波驱动电源的设计方案。设计的超声波驱动电源可以产生正弦波、三角波、方波、锯齿波4种激励信号,并通过对DDS频率控制字的调整可以有效实现频率在20 k Hz^1 MHz范围内任意可调,利用可编程增益放大器AD8250结合分段放大算法实现了电源功率的方法与可调。经仿真实验验证设计的超声波驱动电源可以实现波形可选、频率可调、功率可调的功能,能有效驱动应用于超声波精密测量领域的超声波换能器。
