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Prescribed time control based on the periodic delayed sliding mode surface without singularities

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Science China(Information Sciences) 2024年第7期67卷 256-270页

作者： bin ZHOU Yi ding Kang-Kang ZHANG Guang-Ren DUAN Center for Control Theory and Guidance Technology Harbin Institute of Technology

In this paper, nonsingular prescribed-time control is studied based on periodic delayed sliding mode surfaces. Different from the existing sliding mode control, where either singularity problems may appear or the convergence time depends on the initial state, the proposed sliding mode control approaches can achieve prescribed-time convergence without singularity. The proposed nonsingular sliding mode control approaches can be applied to both second-order and high-order nonlinear systems with prescribed-time convergence. As applications of the proposed sliding mode control approaches, the control of hypersonic vehicle systems is revisited. Numerical simulations on the nonlinear model of the hypersonic vehicle system show the effectiveness of the proposed methods.

关键词： prescribed-time control smooth periodic delayed feedback sliding mode control high-order nonlinear systems hypersonic vehicle systems

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变压器并列运行时负荷分配比例与短路阻抗关系的分析

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电工电气 2024年第6期 44-48页

作者：周才康林治鹏丁斌王明虎浙江爱力浦科技股份有限公司浙江三门317100 扬戈科技股份有限公司浙江三门317100

变压器并列运行需要考虑如何解决负荷分配随各变压器额定容量匹配的合理性问题,而短路阻抗是影响负荷分配比例的主要因素。介绍了变压器并列运行的优缺点及并列运行的理想条件,以两台变压器并列运行为例,分析了负荷分配比例与短路阻抗... 详细信息

变压器并列运行需要考虑如何解决负荷分配随各变压器额定容量匹配的合理性问题,而短路阻抗是影响负荷分配比例的主要因素。介绍了变压器并列运行的优缺点及并列运行的理想条件,以两台变压器并列运行为例,分析了负荷分配比例与短路阻抗大小的关系。结果表明:额定容量不相等的两台变压器并列运行时,要尽可能保证其短路阻抗相等,使每台变压器所带的负荷根据各自的额定容量按比例进行分配;不能满足短路阻抗完全相等的条件时,额定容量较小的变压器短路阻抗应选择大一些,额定容量较大的变压器短路阻抗应选择小一些,使并列运行后的系统总传输容量大于两台变压器的额定容量之和,以提高系统运行的经济性和安全性。

关键词：变压器并列运行负荷分配比例短路阻抗满载运行传输容量

Pt/TiO_(2–x) nanofibrous aerogel for effective nitrogen reduction: A simple strategy for simultaneous Pt formation and TiO_(2–x) vacancy engineering

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Chinese Chemical Letters 2022年第2期33卷 1001-1005页

作者： Meng Zhang Jin Dai Shengmei Huang Dan Fang Yitao Liu Jianyong Yu bin ding Andreas Greiner Innovation Center for Textile Science and Technology College of TextilesDonghua UniversityShanghai 201620China Macromolecular Chemistry and Bavarian Polymer Institute University of BayreuthBayreuth 95440Germany

Electrocatalysis plays an increasingly important role in converting atmospheric molecules(e.g.,N_(2),CO_(2) and H_(2)O)to value-added products(e.g.,NH_(3),C_(2)H_(4)and H_(2)).However,developing a simple strategy for preparing catalysts with high performance for the effective conversion of clean energy is still full of ***,we describe a straightforward,one-step reduction method to achieve the formation of Pt nanoparticles(NPs)and the vacancy engineering of TiO_(2-x)nanofibers(NFs)simultaneously,which can be accomplished in 5 ***,a Pt/TiO_(2-x)nanofibrous aerogel(NA)with an ordered cellular archi-tecture is prepared through a directional freezing *** Pt/TiO_(2-x)NA with excellent mechanical properties can be made into a self-supporting electrode for electrocatalytic N_(2)reduction reaction(NRR),showing high NH_(3) yield rate(4.81×10^(-10)mol/s cm^(-2))and Faraday efficiency(14.9%)at-0.35 V ***.

关键词： Vacancy engineering Pt nanoparticles TiO_(2–x)nanofibers Nanofibrous aerogel Electrocatalysis Nitrogen reduction

多期CTA重建ColorViz融合图血管分级在急性缺血性脑卒中患者中的临床研究

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中国临床医学影像杂志 2024年第6期35卷 381-385页

作者：王强许允发李雪周鼎彬温欣然孙楠孙小童李雷王琦沈阳市第二中医医院放射科辽宁沈阳110101 中国医科大学辽宁沈阳110000

目的:探讨基于FastStroke软件的多期CT血管成像(Multi-phase CT angiography,mCTA)彩色编码(ColorViz)融合图对急性缺血性脑卒中患者新发脑梗死病灶的诊断价值。方法:前瞻性收集69例单侧前循环闭塞急性缺血性脑卒中患者,所有入组患者均... 详细信息

目的:探讨基于FastStroke软件的多期CT血管成像(Multi-phase CT angiography,mCTA)彩色编码(ColorViz)融合图对急性缺血性脑卒中患者新发脑梗死病灶的诊断价值。方法:前瞻性收集69例单侧前循环闭塞急性缺血性脑卒中患者,所有入组患者均行mCTA扫描(动脉期、静脉期和静脉晚期)。CT后处理使用GE医疗FastStroke软件的ColorViz将来自mCTA所有期的血管信息融合为一个时变ColorViz图。所有患者3 d内进行磁共振扩散加权成像(Magnetic resonance-diffusion weighted imaging,MR-DWI)检查。以MR-DWI检查结果作为诊断新发脑梗死病灶的金标准,评价mCTA的ColorViz融合图对脑内新发梗死病灶的诊断能力。结果:mCTA的ColorViz融合图检出灰质区新发梗死病灶的敏感性为90.3%,检出白质区新发梗死病灶的敏感性为36.7%。mCTA的ColorViz融合图主观血管分级评分与MR-DWI梗死面积呈中等程度负相关(r=-0.540,P<0.001)。结论:基于FastStroke软件的mCTA ColorViz融合图对急性缺血性脑卒中患者新发脑梗死病灶的诊断具有一定的价值。mCTA的ColorViz融合图在灰质区的敏感性较高,在白质区的敏感性较低。

关键词：缺血性卒中计算机体层摄影血管造影术

熔喷聚乳酸/聚偏氟乙烯电晕驻极空气过滤材料电荷存储与过滤性能相关性研究

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纺织学报 2024年第1期45卷 12-22页

作者：杨奇刘高慧黄琪帏胡睿丁彬俞建勇王先锋东华大学纺织学院上海201620 东华大学纺织科技创新中心上海201620

针对空气颗粒物污染问题,为实现对空气中PM 2.5以及其它有害颗粒物的高效过滤,从而达到保护人体生命健康的目的,将介电性与极性良好的聚偏氟乙烯(PVDF)与生物可降解的聚乳酸(PLA)熔融共混,并经过熔喷纺丝工艺结合电晕驻极,制备出具有纤... 详细信息

针对空气颗粒物污染问题,为实现对空气中PM 2.5以及其它有害颗粒物的高效过滤,从而达到保护人体生命健康的目的,将介电性与极性良好的聚偏氟乙烯(PVDF)与生物可降解的聚乳酸(PLA)熔融共混,并经过熔喷纺丝工艺结合电晕驻极,制备出具有纤维直径细、孔径小、过滤效率高、过滤阻力低的环境友好型驻极体空气过滤材料。通过系统研究PVDF对PLA电晕驻极体空气过滤材料的结晶行为、电荷存储性能及其机制与过滤性能之间的关系,发现PVDF的引入对PLA/PVDF熔喷非织造布纤维的结晶性能具有重要影响,可使PLA结晶速度加快,结晶度增加。PLA/PVDF电晕驻极熔喷布的初始表面静电势高达3 kV以上,热刺激放电测试峰值更高,电荷存储量有明显提升。特别地,在85 L/min纺丝流速下测试,PLA/PVDF单层电晕驻极熔喷非织造布过滤性可达85%,过滤阻力小于40 Pa,相较于未添加PVDF的电晕驻极熔喷非织造布过滤效率提升20%以上;探讨了电晕驻极后PLA/PVDF熔喷非织造布的电荷存储机制,发现PLA/PVDF熔喷非织造布的电荷存储性能提升最终使过滤性能提高。

关键词：空气过滤材料驻极体熔喷电晕驻极聚乳酸聚偏氟乙烯

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花生高产种植技术与应用推广探讨

农业技术与装备 2024年第4期 142-144页

作者：王瑞冯梦诗蒋莹常蕾谢吉先丁彬江苏省农业科学院泰州农科所江苏泰州225300

花生是泰州市重要的粮油作物,同时也是带动当地农民增收的重要经济作物,保证花生安全高效生产意义重大。花生产量、质量和种植技术密切相关,如种植技术落后且应用不规范,会对花生的产量和质量产生极大的影响。在此背景下,推广应用花生... 详细信息

花生是泰州市重要的粮油作物,同时也是带动当地农民增收的重要经济作物,保证花生安全高效生产意义重大。花生产量、质量和种植技术密切相关,如种植技术落后且应用不规范,会对花生的产量和质量产生极大的影响。在此背景下,推广应用花生高产种植技术势在必行。本文以泰州市为例,首先分析了花生高产种植技术要点,其次探讨了花生高产种植技术应用推广策略。

关键词：泰州市花生高产种植技术应用推广策略

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Molecularly engineered tumor acidity-responsive plant toxin gelonin for safe and efficient cancer therapy

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Bioactive Materials 2022年第12期7卷 42-55页

作者： Guo-bin ding Chenchen Zhu Qian Wang Huiyan Cao bin-Chun Li Peng Yang Roland H.Stauber Guangjun Nie Zhuoyu Li Institute of Biotechnology The Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of EducationShanxi UniversityTaiyuan030006China CAS Key Laboratory for Biomedical Effects of Nanomaterials&Nanosafety National Center for Nanoscience and TechnologyBeijing100190China Nanobiomedicine Department/ENT University Medical Center MainzMainz55131Germany

Due to the unsatisfactory therapeutic efficacy and inexorable side effects of small molecule antineoplastic agents,extensive efforts have been devoted to the development of more potent macromolecular agents with *** is a plant-derived protein toxin that exhibits robust antitumor effect via inactivating ribosomesand inhibiting protein ***,its poor internalization ability to tumor cells has compromisedthe therapeutic promise of *** this study,a tumor acidity-responsive intracellular protein deliverysystem-functional gelonin(Trx-pHLIP-Gelonin,TpG)composed of a thioredoxin(Trx)tag,a pH low insertionpeptide(pHLIP)and gelonin,was designed and obtained by genetic recombination technique for the first *** could effectively enter into tumor cells under weakly acidic conditions and markedly suppress tumor cellproliferation via triggering cell apoptosis and inhibiting protein *** importantly,treatment byintravenous injection into subcutaneous SKOV3 solid tumors in a mouse model showed that TpG was much moreeffective than gelonin in curtailing tumor growth rates with negligible ***,our present worksuggests that the tumor acidity-targeted delivery manner endowed by pHLIP offers a new avenue for efficientdelivery of other bioactive substances to acidic diseased tissues.

关键词： Gelonin Biosynthesis pHLIP Tumor-acidity responsive Apoptosis Cancer therapy

Advantages of Rho-associated kinases and their inhibitor fasudil for the treatment of neurodegenerative diseases

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Neural Regeneration Research 2022年第12期17卷 2623-2631页

作者： Qing Wang Li-Juan Song Zhi-bin ding Zhi Chai Jie-Zhong Yu Bao-Guo Xiao Cun-Gen Ma Research Center of Neurobiology The Key Research Laboratory of Benefiting Qi for Acting Blood Circulation Method to Treat Multiple Sclerosis of State Administration of Traditional Chinese MedicineShanxi University of Chinese MedicineJinzhongShanxi ProvinceChina Department of Physiology Shanxi Medical UniversityTaiyuanShanxi ProvinceChina Institute of Brain Science Shanxi Key Laboratory of Inflammatory Neurodegenerative DiseasesShanxi Datong UniversityDatongShanxi ProvinceChina Department of Neurology Datong Fifth People’s HospitalDatongShanxi ProvinceChina Institute of Neurology Huashan HospitalInstitutes of Brain Science and State Key Laboratory of Medical NeurobiologyFudan UniversityShanghaiChina

Ras homolog(Rho)-associated kinases(ROCKs)belong to the serine-threonine kinase family,which plays a pivotal role in regulating the damage,survival,axon guidance,and regeneration of *** are also involved in the biological effects of immune cells and glial cells,as well as the development of neurodegenerative disorders such as Alzheimer’s disease,Parkinson’s disease,and multiple *** studies by us and others confirmed that ROCKs inhibitors attenuated the symptoms and progression of experimental models of the abovementioned neurodegenerative diseases by inhibiting neuroinflammation,regulating immune imbalance,repairing the blood-brain barrier,and promoting nerve repair and myelin ***,the first ROCKs inhibitor to be used clinically,has a good therapeutic effect on neurodegenerative *** increases the activity of neural stem cells and mesenchymal stem cells,thus optimizing cell *** review will systematically describe,for the first time,the effects of abnormal activation of ROCKs on T cells,B cells,microglia,astrocytes,oligodendrocytes,and pericytes in neurodegenerative diseases of the central nervous system,summarize the therapeutic potential of fasudil in several experimental models of neurodegenerative diseases,and clarify the possible cellular and molecular mechanisms of ROCKs *** review also proposes that fasudil is a novel potential treatment,especially in combination with cell-based *** from this review add support for further investigation of ROCKs and its inhibitor fasudil for the treatment of neurodegenerative diseases.

关键词： Alzheimer’s disease cell-based therapy central nervous system cells fasudil immunocytes multiple sclerosis Parkinson’s disease pericytes Rho kinase inhibitor Rho-associated kinases

Design of a Multifrequency Signal Parameter Estimation Method for the Distribution Network Based on HIpST

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Energy Engineering 2024年第3期121卷 729-746页

作者： bin Liu Shuai Liang Renjie ding Shuguang Li Tongliao Power Supply Company State Grid East Inner Mongolia Electric Power Co.Ltd.Tongliao028000China School of Electrical Engineering Northeast Electric Power UniversityJilin132012China

The application of traditional synchronous measurement methods is limited by frequent fluctuations of electrical signals and complex frequency components in distribution ***,it is critical to find solutions to the issues of multifrequency parameter estimation and synchronous measurement estimation accuracy in the complex environment of distribution *** utilizing the multifrequency sensing capabilities of discrete Fourier transform signals and Taylor series for dynamic signal processing,a multifrequency signal estimation approach based on HT-IpDFT-STWLS(HIpST)for distribution networks is ***,by introducing the Hilbert transform(HT),the influence of noise on the estimation algorithm is ***,signal frequency components are obtained on the basis of the calculated signal envelope spectrum,and the interpolated discrete Fourier transform(IpDFT)frequency coarse estimation results are used as the initial values of symmetric Taylor weighted least squares(STWLS)to achieve high-precision parameter estimation under the dynamic changes of the signal,and the method increases the number of discrete ***,the accuracy of this proposed method is verified by simulation *** show that this proposed method can accurately achieve the parameter estimation of multifrequency signals in distribution *** approach provides a solution for the application of phasor measurement units in distribution networks.

关键词： Discrete fourier transform taylor series hilbert transform multifrequency signal parameter estimation