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Stability analysis and stabilization of semi-Markov jump linear systems with unavailable sojourn-time information

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Science China(Information Sciences) 2024年第7期67卷 211-223页

作者： Xiaotai WU Yang TANG shuai mao Ying ZHAO School of Mathematics and Physics Anhui Polytechnic University Key Laboratory of Advanced Control and Optimization for Chemical Processes Ministry of EducationEast China University of Science and Technology

This study addresses the stability and stabilization problems of discrete-time semi-Markov jump linear systems(S-MJLSs) with unavailable sojourn-time information. The sojourn-time probability mass functions(S-TPMFs) of discrete-time semi-Markov chains are no longer confined to the geometric distribution, and it is difficult to obtain accurate and comprehensive information for S-TPMFs in practice. This is because S-TPMFs are usually deduced from the statistical characteristics according to the sampled-data, while adequate samples are often costly and time consuming. In this study, when the S-TPMFs for semi-Markov chains are assumed to be unavailable, the σ-error mean square stability is investigated for discrete-time S-MJLSs with some widely used assumptions; for semi-Markov chains, only the transition probability matrix of the embedded chain is used. In addition, the existence conditions of the effective controller are provided for closed-loop systems without using the information of S-TPMFs. Numerical examples are presented to illustrate the validity of the obtained theoretical results.

关键词： semi-Markov chain semi-Markov jump linear systems $\sigma$-error mean square stability unavailable sojourn-time information

Reconstruction of Postinfarcted Cardiac Functions Through Injection of Tanshinone ⅡA@Reactive Oxygen Species-Sensitive Microspheres Encapsulated in a Thermoreversible Hydrogel

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Energy & Environmental Materials 2024年第2期7卷 187-199页

作者： Ling Yu Yubin Liang Lei Gao Peipei Chen Zhiqiang Yu Minzhou Zhang Aleksander Hinek shuai mao Second Clinical College Guangzhou University of Chinese MedicineGuangzhou 510120China Department of Critical Care Medicine Guangdong Provincial Hospital of Chinese MedicineGuangzhou 510120China Guangdong Provincial Branch of National Clinical Research Centre for Chinese Medicine Cardiology Guangzhou 510120China Department of Radiation Medicine and Applied Sciences University of California San DiegoLa JollaCalifornia 92093USA Department of Laboratory Medicine Dongguan Institute of Clinical Cancer ResearchAffiliated Dongguan HospitalSouthern Medical UniversityDongguan 523018China Translational Medicine Hospital for Sick ChildrenToronto M5G 0A4Canada

Myocardial damage resulting from acute myocardial infarction often leads to progressive heart failure and sudden death,highlighting the urgent clinical need for effective ***,tanshinoneⅡA has been identified as a promising therapeutic agent for myocardial ***,efficient delivery remains a major issue that limits clinical *** address this problem,an injectable thermosensitive poly(lactic acid-co-glycolic acid)-block-poly(ethylene glycol)-block-poly(lactic acid-co-glycolic acid)gel(PLGA-PEG-PLGA)system encapsulating tanshinoneⅡA-loaded reactive oxygen species-sensitive microspheres(Gel-MS/tanshinoneⅡA)has been designed and synthesized in this *** thermosensitive hydrogel exhibits good mechanical properties after reaching body *** initially immobilized by the gel exhibit excellent reactive oxygen species-triggered release properties in a high-reactive oxygen species environment after myocardial infarction *** a result,encapsulated tanshinoneⅡA is effectively released into the infarcted myocardium,where it exerts local anti-pyroptotic and anti-inflammatory ***,the combined advantages of this technique contribute to the mitigation of left ventricular remodeling and the restoration of cardiac function following tanshinoneⅡ***,this novel,precision-guided intra-tissue therapeutic system allows for customized local release of tanshinoneⅡA,presenting a promising alternative treatment strategy aimed at inducing beneficial ventricular remodeling in the post-infarct heart.

关键词： myocardial infarction ROS-sensitive polymer tanshinoneⅡA thermoreversible hydrogel ventricular remodeling

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一起10 kV开关控制回路故障分析及改进

冶金动力 2024年第5期 12-14页

作者：毛帅中天钢铁集团有限公司江苏常州213100

10 kV高压开关在工贸企业中广泛应用,确保其控制回路的正常运行是高压开关分合闸动作的前提条件,其完好性影响着供电系统的安全运行。以某炼铁厂1台磨煤机的10 kV高压开关控制回路故障为例,对故障原因进行了分析,并基于该起故障分析了... 详细信息

10 kV高压开关在工贸企业中广泛应用,确保其控制回路的正常运行是高压开关分合闸动作的前提条件,其完好性影响着供电系统的安全运行。以某炼铁厂1台磨煤机的10 kV高压开关控制回路故障为例,对故障原因进行了分析,并基于该起故障分析了开关存在的不足,提出了改进措施,为相关设备控制电路的设计及故障处理提供了一定的参考。

关键词： 10 kV高压开关控制回路故障转换开关

基于励磁电压方波调制的三级式同步起动/发电机转子初始位置估算方法

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中国电机工程学报 2024年第10期44卷 4073-4081,I0027页

作者：张小科刘卫国焦宁飞毛帅姚普西北工业大学自动化学院陕西省西安市710072

现有基于高频注入的三级式同步起动/发电机转子初始位置估算方法由于高频衰减,面临失效风险。该文基于主电机定转子互感,提出一种“基于励磁电压方波调制的三级式同步起动/发电机转子初始位置估算方法”,将励磁电压作为载波,用低频方波... 详细信息

现有基于高频注入的三级式同步起动/发电机转子初始位置估算方法由于高频衰减,面临失效风险。该文基于主电机定转子互感,提出一种“基于励磁电压方波调制的三级式同步起动/发电机转子初始位置估算方法”,将励磁电压作为载波,用低频方波对其进行调制后,提取主电机定子侧低频响应电流用于转子初始位置估算。定子逆变器三相下管导通状态下,该方法分为2步:首先对励磁电压进行低频方波调制,采集主电机定子低频感应电流用于转子初始位置预估算;其次,由预估算初始位置,判断励磁电压断电前后相关电流特征,得到包含磁极信息的最终初始位置。所提方法通过虚拟角度变换和方差对采集低频电流进行处理。实验表明所提方法具有较高估算精度。

关键词：三级式同步起动/发电机转子初始位置估算励磁电压方波调制虚拟角度方差

On a Supercongruence Conjecture of Z.-***

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Chinese Annals of Mathematics,Series B 2022年第3期43卷 417-424页

作者： Guo-shuai mao Department of Mathematics Nanjing University of Information Science and TechnologyNanjing 210044China

In this paper,the author partly proves a supercongruence conjectured by Z.-*** in *** p be an odd prime and let a∈Z^(+).Then,if p≡1(mod 3),[5/6p^(a)]∑k=0(2kk)/16^(k)≡(3/p^(a))(mod p^(2))is obtained,where(■)is the... 详细信息

关键词： Supercongruences Binomial coefficients Fermat quotient Jacobi symbol

基于励磁机定子直轴电流定点采样的航空多级式起动/发电机低速段转子位置估算方法

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中国电机工程学报 2024年第15期44卷 6169-6180,I0028页

作者：张小科焦宁飞毛帅刘卫国高昕樊昱琨西北工业大学自动化学院陕西省西安市710072

航空多级式起动/发电机起动时,需要准确的主电机转子位置,而位置传感器受体积、重量等制约,需要开展转子位置估算研究。该文基于多级式电机结构特征,通过分析转子位置在主励磁机定子电流中的表征,提出一种基于两相励磁机定子直轴电流定... 详细信息

航空多级式起动/发电机起动时,需要准确的主电机转子位置,而位置传感器受体积、重量等制约,需要开展转子位置估算研究。该文基于多级式电机结构特征,通过分析转子位置在主励磁机定子电流中的表征,提出一种基于两相励磁机定子直轴电流定点采样的低速段转子位置估算方法。该方法在起动时分三步实施:首先,实时采集主励磁机定子两相电流,并变换到定子磁场同步旋转dq坐标系;其次,对直轴电流定点采样,提取包含转子位置信息的正余弦信号,通过锁相环获得主励磁机转子位置增量;然后,结合主电机与主励磁机同轴安装特征及主电机初始位置,获取主电机实时转子位置,并实现低速段无位置传感器起动。该方法无需高频信号注入和滤波器,不依赖主电机凸极性且锁相环鲁棒性强。最后,实验验证了所提方法的有效性和较高的估算精度。

关键词：航空多级式起动/发电机两相励磁机定点采样转子位置估算

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超薄柔性热管蒸汽通道微压印成形及传热性能研究

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机械工程学报 2024年第14期60卷 329-337页

作者：孙亚隆汤勇梁富业张仕伟伍春霞帅茂唐恒郑州大学机械与动力工程学院郑州450001 华南理工大学机械与汽车工程学院广州510640 深圳大学机电与控制工程学院深圳518000

介绍PMMA壳体超薄柔性热管的制造设备与加工过程。分别采用分离式微压印模具加工的微柱子阵列和高温烧结多层铜丝网作为蒸汽通道和吸液芯,制造厚度0.67mm的超薄柔性热管。研究微压印温度、压力和压印时间对微柱子成形的影响。介绍超薄... 详细信息

介绍PMMA壳体超薄柔性热管的制造设备与加工过程。分别采用分离式微压印模具加工的微柱子阵列和高温烧结多层铜丝网作为蒸汽通道和吸液芯,制造厚度0.67mm的超薄柔性热管。研究微压印温度、压力和压印时间对微柱子成形的影响。介绍超薄柔性热管传热性能试验台设计与试验方法,试验结果表明最佳充液量为350~400μL,最高热导率达到924.1 W/(m·K);当超薄柔性热管弯曲90°时,其热导率仍为铜热导率的1.16倍。综上所述,利用微压印成形制作的PMMA壳体超薄柔性热管具有结构灵活、成本低廉以及低蒸汽阻力的优点,是解决柔性可穿戴式电子设备散热难题的理想方案。

关键词：柔性热管超薄微压印蒸汽通道聚合物

Effect of supplementing Qi and promoting blood circulation therapy on left ventricular remodeling: a systematic review and Meta-analysis

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Journal of Traditional Chinese Medicine 2020年第3期40卷 365-375页

作者： mao shuai Zuo Tian Jiang Lu Zhang Minzhou Key Discipline of Integrated Chinese and Western Medicine Second Clinical CollegeGuangzhou University of Chinese MedicineGuangzhou 510405China Cardiovascular Institute Stanford University School of MedicineStanford 94305USA Department of Critical Care Medicine Guangdong Provincial Hospital of Chinese MedicineGuangzhou 510120China

OBJECTIVE: To evaluate the effectiveness of an adjuvant therapy from Traditional Chinese Medicine for supplementing Qi and promoting blood circulation(CMSQPBC) on left ventricular remodeling in patients after myocardial infarction(MI).METHODS: Randomized controlled trials were identified in the Cochrane Library, Embase, Web of Science, PubMed, China National Knowledge Infrastructure Database, Chinese Biomedical Literature Database, China Science and Technology Journal Database, Wanfang databases, reviews, and reference lists of relevant articles. The weighted mean difference(WMD) was calculated for changes in the left ventricular ejection fraction(LVEF), LV end-diastolic volume(LVEDV) and LV end-systolic volume(LVESV) from baseline to follow-up(> 3 months) by using random-effects Meta-analysis. The primary outcome was change in LVEF, and secondary outcomes were changes in LV dimensions including LVEDV and ***: A total of 10 trials(enrolling 854 participants, median follow-up six months) evaluated the association between CMSQPBC and changes in LV function and volume. Compared with the control group, CMSQPBC significantly improved LVEF(854 patients;WMD: 4.97%, 95% CI: 3.78-6.15;P < 0.001)and attenuated the enlargement of LVEDV(607 patients;WMD:-7.89 mL, 95% CI:-11.54 to-4.24;P<0.001) and LVESV(364 patients;WMD =-5.80 mL,95% CI,-9.60 to-2.01;P < 0.01).CONCLUSION: CMSQPBC may reverse deleterious pathological remodeling after myocardial infarction. Higher quality and more rigorous randomized trials with larger sample sizes are needed to further confirm the findings.

关键词： Ventricular remodeling Myocardial infarction Reinforcing Qiactivating blood Qi-deficiency blood stasis Systematic review Meta-analysis

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双网络水凝胶在医药领域的应用及研究进展

组织工程与重建外科 2024年第1期20卷 135-141页

作者：张璨琁冯雨金贺启元毛帅西安交通大学陕西省西安市710049

双网络(DN)水凝胶是一种具有三维网络结构的高分子生物黏附材料,采用刚性网络与柔性网络互穿的形式对传统单网络(SN)水凝胶进行了强化,具备较高的机械强度与韧性,被广泛应用于医药领域。近年来,出现了多种新型DN水凝胶,为传统DN水凝胶... 详细信息

双网络(DN)水凝胶是一种具有三维网络结构的高分子生物黏附材料,采用刚性网络与柔性网络互穿的形式对传统单网络(SN)水凝胶进行了强化,具备较高的机械强度与韧性,被广泛应用于医药领域。近年来,出现了多种新型DN水凝胶,为传统DN水凝胶赋予了快速凝胶化、强组织附着力等更多优势,进一步拓宽了DN水凝胶的应用范围。现将近年来DN水凝胶在医药领域的应用及发展现状进行综述。

关键词：双网络水凝胶医药卫生临床应用