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技术创新、产业结构升级和出口贸易韧性

新经济 2024年第6期 46-63页

作者：邓小乐林淑仪新疆财经大学国际经贸学院中国(新疆)与中亚区域经济合作研究中心

本文采用2009-2022年30省区市数据(不包含香港地区、台湾地区、澳门地区和西藏),构建双向固定面板回归模型考察技术创新对出口贸易韧性的影响。研究发现:技术创新对出口贸易韧性具有显著正向提升作用,该结论经过一系列稳健性检验后仍然... 详细信息

本文采用2009-2022年30省区市数据(不包含香港地区、台湾地区、澳门地区和西藏),构建双向固定面板回归模型考察技术创新对出口贸易韧性的影响。研究发现:技术创新对出口贸易韧性具有显著正向提升作用,该结论经过一系列稳健性检验后仍然成立。通过机制分析发现,技术创新可以通过提高产品质量和降低成本直接提高出口贸易韧性。产业结构升级所带来的“护城河”效应和突破路径锁定,使得其在技术创新对于出口贸易韧性的提升过程中发挥中介效应,并且技术创新对于出口贸易韧性提升具有显著的空间溢出效应。通过异质性分析发现,技术创新对于经济发达地区和非边疆地区出口贸易韧性提升作用更为显著。基于此,本文提出以下政策启示:一是重视创新成果的转化;二是加强地区经济合作与交流,提升边疆地区技术创新水平;三是重视技术创新与产业结构的协同发展。

关键词：技术创新产业结构升级出口贸易韧性中介效应空间溢出

Prediction of Superhard BN_(2) with High Energy Density

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Chinese Physics Letters 2021年第1期38卷 125-130页

作者： Yiming Zhang shuyi lin Min Zou Meixu Liu Meiling Xu Pengfei Shen Jian Hao Yinwei Li Laboratory of Quantum Functional Materials Design and Application School of Physics and Electronic EngineeringJiangsu Normal UniversityXuzhou 221116China Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 518055China

Considering that pressure-induced formation of short,strong covalent bonds in light-element compounds can produce superhard materials,we employ structure searching and first-principles calculations to predict a new class of boron nitrides with a stoichiometry of BN_(2),which are stable relative to alpha-B and alpha-N_(2) at ambient *** ambient pressure,the most stable phase has a layered structure(h-BN_(2)) containing hexagonal BN layers between which there are intercalated N_(2) *** 25 GPa,a three-dimensional P4_(2)/mmc structure with single N-N bonds becomes the most ***,thermal,and mechanical stability calculations reveal that this structure can be recovered under ambient *** calculated stress-strain relations demonstrate an intrinsic superhard nature with an estimated Vickers hardness of ~43 *** structure has a potentially high energy density of ~4.19 kJ/g.

关键词： ambient structure hexagonal

Speed Control for Sensorless SPMSM via Variable Structure Controller and EMF-Based Position Estimation Scheme

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Speed Control for Sensorless SPMSM via Variable Structure Co...

第36届中国控制会议

作者： shuyi lin Weidong Zhang Yajing Ma Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education

ISBN: (纸本)9781538629185

This paper presents a sensorless control strategy for the surface-mounted permanent magnet synchronous motors（SPMSMs） with a sliding mode controller（SMC）.To extract accurate rotor position from the back electromotive force（EMF） of the SPMSM,a tangent function-based phase-locked loop（PLL） is *** extra tuning of parameters,the position estimation scheme manages to provide accurate rotor position under both forward and reverse rotational *** to conventional sliding mode control approach,the proposed SMC adopts a nonlinear reaching law,which helps the controller to simultaneously achieve faster reaching time and lower chattering *** of the proposed control strategy is verified by simulation results.

关键词： Position observer motor speed control sliding mode controller phase-locked loop

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交流电磁阀三维温度特性仿真分析

中国电机工程学报 2012年第36期32卷 156-164,10页

作者：林抒毅许志红福州大学电气工程与自动化学院福建省福州市350108

电磁阀是一种常用的电磁电器,对其电磁机构的电磁场和温度场进行分析,对提高电磁阀各项性能指标很有帮助。提出了通过电磁热耦合的方式计算交流电磁阀稳定温度的思路,建立了交流电磁阀三维有限元模型,由电磁场仿真计算得到电磁机构各部... 详细信息

电磁阀是一种常用的电磁电器,对其电磁机构的电磁场和温度场进行分析,对提高电磁阀各项性能指标很有帮助。提出了通过电磁热耦合的方式计算交流电磁阀稳定温度的思路,建立了交流电磁阀三维有限元模型,由电磁场仿真计算得到电磁机构各部件功率损耗,再由热场仿真模型计算电磁机构的温度场分布,通过实验验证了仿真模型的有效性。同时,分析了匝数、线径、磁轭厚度、包封层厚度、材料特性等参数对电磁阀温度分布的影响,为电磁阀优化设计提供了参考。

关键词：交流电磁阀有限元温度特性三维仿真电磁热耦合

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交流接触器三维动态过程数值计算与分析

中国电机工程学报 2014年第18期34卷 2967-2975页

作者：林抒毅许志红福州大学电气工程与自动化学院福建省福州市350116

为了全面提高交流接触器的整体性能指标,该文建立了含触头系统与电磁系统的交流接触器全仿真三维动态模型,考虑运动过程中摩擦力、碰撞过程形变等因素的影响,将描述材料形变量的本构方程、运动方程以及边界约束引入控制方程中,建立三维... 详细信息

为了全面提高交流接触器的整体性能指标,该文建立了含触头系统与电磁系统的交流接触器全仿真三维动态模型,考虑运动过程中摩擦力、碰撞过程形变等因素的影响,将描述材料形变量的本构方程、运动方程以及边界约束引入控制方程中,建立三维运动数学模型。通过实验对模型进行验证,重点考核铁心与触头的弹跳情况。实验结果表明该三维仿真模型能真实反应交流接触器触头、铁心的吸合弹跳过程。通过仿真模型分析触头一次弹跳、二次弹跳以及铁心弹跳的影响因素,分析了合闸相角、电压、铁心弹簧、触头弹簧等参数对触头、铁心吸合弹跳的影响,为进一步研究交流接触器吸合弹跳抑制措施提供理论依据。

关键词：交流接触器动态模型吸合过程三维全仿真 ANSYS LS-DYNA

UPLC-MS/MS测定凉果类酵素食品中的致泻类非法添加物

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发酵科技通讯 2024年第1期53卷 1-7页

作者：裘一婧贾彦博江海孙岚陈美春陈丽芳余菁林舒忆杭州市食品药品检验研究院浙江杭州310022

建立了一种简便准确检测凉果类酵素食品中非法添加多种致泻类化合物的UPLC-MS/MS检测方法。采用超微冷冻技术粉碎样本,用Oasis PRIME HLB固相萃取SPE净化;采用UPLC-MS/MS法,以浓度为0.02 mol/L的乙酸铵水溶液甲醇为流动相梯度洗脱,以COR... 详细信息

建立了一种简便准确检测凉果类酵素食品中非法添加多种致泻类化合物的UPLC-MS/MS检测方法。采用超微冷冻技术粉碎样本,用Oasis PRIME HLB固相萃取SPE净化;采用UPLC-MS/MS法,以浓度为0.02 mol/L的乙酸铵水溶液甲醇为流动相梯度洗脱,以CORTECS UPLC C18(1.6μm,2.1 mm×100 mm)色谱柱进行分离;采用串联四级杆质谱仪对凉果类酵素食品中的6种致泻类非法添加化合物进行定量检测。检测结果:线性范围为1~1000μg/L,相关性r^(2)≥0.9961;方法检测限LOD为0.1~1.0μg/kg,定量限LOQ为0.3~3.0μg/kg,高、中、低平均回收率均为82.5%~105.3%;日内精密度的RSD(n=9)为0.8%~3.7%。该检测方法专属性强、操作快捷,可作为凉果类酵素食品中致泻类非法添加化合物的有效检测方法。

关键词： UPLC-MS/MS 凉果类酵素食品添加物

IMC-PID Load Disturbance Rejection Controller with Set-point Filter for The Integrating and Unstable Processes with Time delay

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IMC-PID Load Disturbance Rejection Controller with Set-point...

第37届中国控制会议

作者： Hao Yin Weidong Zhang Ruiwen Yao shuyi lin The Department of Automation Shanghai Jiao Tong University

This paper presents an internal model control（IMC） based proportional-integral-derivative（PID） controller for integrating and unstable processes with time *** H2 optimal scheme is utilized to design the IMC controller to improve the disturbance rejection *** controller is then used to obtain PID parameters by the approach of Maclaurin series *** trade-off set-point tracking performance and the systems disturbance rejection ability,a set-point filter is used to reduce excessive overshoot in the set-point *** results certify the effectiveness of the proposed control strategy.

关键词： IMC-PID Integrating and Unstable Processes with Time Delay Set-point Filter

Internal Model Control on Hybrid Headbox System

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Internal Model Control on Hybrid Headbox System

第36届中国控制会议

作者： Zehua Zhou Song Guo shuyi lin Weidong Zhang Department of Automation Shanghai Jiaotong University Shanghai Academy of Spaceflight Technology

ISBN: (纸本)9781538629185

Headbox is the key component in a paper machine which has a significant effect on product *** this paper,a hybrid model which combines mixing tank and air-cushioned headbox is *** the hybrid model,the mixing tank is taken into consideration,which makes the consistency of pulp *** internal model controller with both good control effect and strong robustness is designed to control the proposed *** the generalized decoupled object,computational work is avoided,and the designed controller has low *** simulations are performed to illustrate the effectiveness of this methodology.

关键词： Hybrid headbox Internal model control Generalized decoupled object

A Consensus-based Filtering Algorithm with State Constraints

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A Consensus-based Filtering Algorithm with State Constraints

第36届中国控制会议

作者： Yajing Ma Song Guo shuyi lin Yunze Cai Department of Automation Shanghai Jiao Tong Universityand Key Laboratory of System Control and Information ProcessingMinistry of Education of China Shanghai Academy of Spaceflight Technology

ISBN: (纸本)9781538629185

This paper proposes a consensus-based filtering algorithm to solve a nonlinear information fusion problem in multi-agent system that the state vector of the target is *** method is based on the Kalman-Consensus filtering algorithm,Extended Kalman filter and null space *** on target tracking prove the feasibility of the algorithm in dealing with state estimation of nonlinear systems under linear and nonlinear *** is demonstrated that a significant increase in the tracking precision can be expected via the proposed method compared with traditional Kalman-Consensus filter.

关键词： State Estimation Constrained Filtering Consensus Algorithm Kalman Filter Multi-agent System