L-Fuzzy Rough Set Based on Complete Residuated Lattice

Residuated lattice is an important non-classical logic algebra, and L-fuzzy rough set based on residuated lattice can describe the information with incompleteness, fuzziness and uncomparativity in information systems. In this paper, the representation theorems of L-fuzzy rough sets based on residuated lattice are given. The properties and axiomatic definition of the lower and upper approximarion operators in L-fuzzy rough sets are discussed.

Mechanism of single-event transient pulse quenching between dummy gate isolated logic nodes

As integrated circuits scale down in size, a single high-energy ion strike often affects multiple adjacent logic nodes.The so-called single-event transient（SET） pulse quenching induced by single-event charge sharing collection has been widely studied. In this paper, SET pulse quenching enhancement is found in dummy gate isolated adjacent logic nodes compared with that isolated by the common shallow trench isolation（STI）. The physical mechanism is studied in depth and this isolation technique is explored for SET mitigation in combinational standard cells. Three-dimensional（3D） technology computer-aided design simulation（TCAD） results show that this technique can achieve efficient SET mitigation.

Research on the Influence Factors and Coordinated Control Strategies between Unit and Grid for Isolated Power System

As the existing coordinated control strategies between grid and unit have limitations in isolated power system, this paper introduces new coordinated control strategies which can improve the stability of isolated system operation. This paper analyzes the power grid side and unit side influence factors on the isolated power system. The dynamic models which are suitable for islanding operation are applied to simulate and analyze the stability and dynamic characteristics of the isolated power system under the conditions of different load disturbances and governor parameters. With considering the differences of frequency characteristics between the interconnected and isolated power system, the adjusting and optimization methods of under frequency load shedding are proposed to meet the frequency stability requirements simultaneously in the two cases. Not only proper control strategies of the power plant but the settings of their parameters are suggested to improve the operation stability of the isolated power system. To confirm the correctness and effectiveness of the method mentioned above, the isolated system operation test was conducted under the real power system condition, and the results show that the proposed coordinated control strategies can greatly improve stability of the isolated power system.

On Fractional Differential Inclusion for an EpidemicModel via L-Fuzzy Fixed Point Results

The real world is filled with uncertainty,vagueness,and imprecision.The concepts we meet in everyday life are vague rather than precise.In real-world situations,if a model requires that conclusions drawn from it have some bearings on reality,then two major problems immediately arise,viz.real situations are not usually crisp and deterministic;complete descriptions of real systems often require more comprehensive data than human beings could recognize simultaneously,process and understand.Conventional mathematical tools which require all inferences to be exact,are not always efficient to handle imprecisions in a wide variety of practical situations.Following the latter development,a lot of attention has been paid to examining novel L-fuzzy analogues of conventional functional equations and their various applications.In this paper,new coincidence point results for single-valued mappings and an L-fuzzy set-valued map in metric spaces are proposed.Regarding novelty and generality,the obtained invariant point notions are compared with some well-known related concepts via non-trivial examples.It is observed that our principal results subsume and refine some important ones in the corresponding domains.As an application,one of our results is utilized to discussmore general existence conditions for realizing the solutions of a non-integer order inclusion model for COVID-19.

PDCA循环对提高腹腔镜下胃癌根治术中隔离技术执行率的应用研究

目的研究PDCA循环对提高腹腔镜下胃癌根治术中隔离技术执行率的应用效果。方法组建护理质量持续改进小组,选定活动主题为提高腹腔镜下胃癌根治术中隔离技术执行率,调查2022年10月16日至2023年3月11日在我院手术室开展腹腔镜下胃癌根治术的手术患者共84例,针对导致术中隔离技术执行率低的原因进行分析,拟定对策并实施,效果确认后列为隔离技术质量标准。结果通过这期PDCA活动,腹腔镜下胃癌根治术中隔离技术执行率由实施前的67.8%提高至91.7%(P<0.001);器械摆台规范率由78.0%提高至97.0%(P<0.001);医生满意度评分由(82.0±3.7)分提高到(98.1±4.0)分。结论PDCA活动提升了手术室护士腹腔镜手术隔离技术的执行率,促进了手术室亚专科手术配合中隔离技术的发展,得到了满意的手术治疗效果。

基于高隔振指标要求的船舶泵组区域隔振模块设计研究

为满足某静音型船舶对于机舱泵组的隔振指标及布置空间的高要求,该文利用区域隔振模块设备间布置紧凑、空间利用率高、隔振效果好等优点,开展该船机舱泵组区域隔振模块的设计研究。从区域隔振模块总体布置、有限元建模、中间筏架模态分析、模块模态分析、模块静力学分析、模块谐响应分析等方面入手,建立了高隔振性能区域隔振模块的设计计算分析流程,完成了该型区域隔振模块的设计及隔振指标计算评估,并对其隔振性能进行测试。结果表明,该型区域隔振模块的隔振性能可满足此类静音型船舶对于机舱泵组高隔振指标的设计要求。

基于IMPMMS并网的新能源电压稳定性分析

新能源并网比例过高导致新能源电网电压稳定性低和机组脱网风险,永磁发电机组(IMPMMS)对系统具有电压补偿能力,能满足新能源电网无功需求。本文根据永磁发电机组的结构和工作原理,分析了永磁发电机组的电压补偿机理,推导影响无功调节能力的参数。结合新能源通过永磁发电机组并网的状态方程,建立电力系统仿真模型,对比不同程度电压跌落下永磁发电机组与传统机组的电压补偿能力及电压隔离作用,最后研制一台缩比样机。仿真和试验结果表明:网侧电压跌落幅度越大,永磁发电机组电压补偿能力越强,且永磁发电机组机械隔离可以隔离故障对新能源机组的影响,有效防止新能源脱网风险的发生,提高新能源发电系统的电压稳定性。

核电主蒸汽阀站中电磁先导阀的动态响应仿真研究

针对核电主蒸汽阀站中关键部件之一——大气释放阀前置隔离阀在实际工况中常出现响应超时的问题,采用数值仿真软件Fluent中的动网格以及用户自定义函数技术,对控制其启闭过程的电磁先导阀动态响应过程进行了研究。首先,研究了电磁先导阀中先导结构的动态响应过程以及阀杆的受力情况;然后,研究了电磁先导阀中主阀的动态响应过程以及主阀泄压时阀内的压力和速度分布情况;最后,综合两个动态过程,分析了电磁先导阀整阀的运动时间。研究结果表明,电磁先导阀的运动时间为8.5 ms,其中先导结构的运动时间占比较小,85%的时间集中在电磁先导阀主阀动作过程。该研究结果可对前置隔离阀响应时间的优化提供参考。

A Characteristic of Cantor Sets

It is well known that a totally disconnected compact metric space without isolated points is a Cantor set.In this note me give a simple proof of this theorem.

配电网层次化保护的优化配置及整定方案研究

文章研究了配电网层次化保护的优化配置及整定方案。先介绍了配电网保护的现状和挑战,然后阐述了层次化保护的概念和优势,接着提出了一种基于层次化保护的优化配置方案,包括保护装置的布局、保护策略的制定及整定值的计算。通过仿真验证了该方案的可行性和有效性。实验结果表明,该方案能够显著提升配电网的保护性能,缩小故障时的停电范围,提升供电的可靠性和稳定性,为配电网保护的优化配置和整定提供新的思路与方法,对于提高配电网的运行安全和稳定性具有重要意义。

6 500t/d水泥生产线余热发电孤网运行技术改进

某6500t/d水泥生产线配套132kV/6kV总降压变电站和12MW余热发电机组,当外部电网故障时,余热发电机组将进行孤网供电运行。分析了现有配电系统无法自动判别改变并网、孤网运行方式,缺乏外部电网故障时的自我保护等问题,提出了构建“电源、电网、负荷”机网协调控制系统解决方案,介绍了其功能构成和结构组件。当外部电网故障时,机网协调控制系统能够迅速切换至适当的电网运行模式,自动实施二次调频调压控制,保障配电系统的稳定运行。

L-fuzzy理想的L-fuzzy孤立成分

本文在[1,3,4,5,6]的基础上,引入了L—fuzzy理想的L-fuzzy孤立成分和孤立L-fuzzy集等概念,并且讨论了它们的基本性质。特别是给出了L-fuzzy理想的正规L-fuzzy分解的第二唯一性定理。

Ellipsoidal bounding set-membership identification approach for robust fault diagnosis with application to mobile robots

A robust fault diagnosis approach is developed by incorporating a set-membership identification (SMI) method. A class of systems with linear models in the form of fault related parameters is investigated, with model uncertainties and parameter variations taken into account explicitly and treated as bounded errors. An ellipsoid bounding set-membership identification algorithm is proposed to propagate bounded uncertainties rigorously and the guaranteed feasible set of faults parameters enveloping true parameter values is given. Faults arised from abrupt parameter variations can be detected and isolated on-line by consistency check between predicted and observed parameter sets obtained in the identification procedure. The proposed approach provides the improved robustness with its ability to distinguish real faults from model uncertainties, which comes with the inherent guaranteed robustness of the set-membership framework. Efforts are also made in this work to balance between conservativeness and computation complexity of the overall algorithm. Simulation results for the mobile robot with several slipping faults scenarios demonstrate the correctness of the proposed approach for faults detection and isolation (FDI).

0.18μm SOI器件技术抗SET设计加固方法

介绍0.18μm SOI器件技术中SET(single event transient)的原理模型及设计加固方法;并结合工艺具体参数,利用TCAD仿真工具进行了模拟仿真。探讨SET在0.18μm SOI器件技术中的微观机理。提出0.18μm SOI工艺SET设计加固方法。重点在于器件和电路级的探讨与加固,尤其是器件物理结构上的SET机理模型及加固设计。

Kabbalah Logic and Semantic Foundations for a Postmodern Fuzzy Set and Fuzzy Logic Theory

Despite half a century of fuzzy sets and fuzzy logic progress, as fuzzy sets address complex and uncertain information through the lens of human knowledge and subjectivity, more progress is needed in the semantics of fuzzy sets and in exploring the multi-modal aspect of fuzzy logic due to the different cognitive, emotional and behavioral angles of assessing truth. We lay here the foundations of a postmodern fuzzy set and fuzzy logic theory addressing these issues by deconstructing fuzzy truth values and fuzzy set membership functions to re-capture the human knowledge and subjectivity structure in membership function evaluations. We formulate a fractal multi-modal logic of Kabbalah which integrates the cognitive, emotional and behavioral levels of humanistic systems into epistemic and modal, deontic and doxastic and dynamic multi-modal logic. This is done by creating a fractal multi-modal Kabbalah possible worlds semantic frame of Kripke model type. The Kabbalah possible worlds semantic frame integrates together both the multi-modal logic aspects and their Kripke possible worlds model. We will not focus here on modal operators and axiom sets. We constructively define a fractal multi-modal Kabbalistic L-fuzzy set as the central concept of the postmodern fuzzy set theory based on Kabbalah logic and semantics.

The Study on the (L,M)-Fuzzy Independent Set Systems

Independent sets play an important role in matroid theory. In this paper, the definitions of pre-independent fuzzy set system and independent fuzzy set system in L-fuzzy setting are presented. Independent M-fuzzifying set system is introduced and some of its properties are discussed. Further independent (L,M)-fuzzy set system is given and some of its properties are obtained. The relations of these independent set systems in the setting of fuzzy vector spaces and fuzzy graphs are showed.

L-Fuzzy Vector Subspaces and Its Fuzzy Dimension

In this paper, we introduce the definition of L-fuzzy vector subspace, define its dimension by an L-fuzzy natural number. For a finite-dimensional L-fuzzy vector subspace, we prove that the equality holds without any restricted conditions. At the same time, we deduce that the formula holds.

血培养厌氧瓶及双套送检的临床应用价值研究

目的研究血培养瓶病原菌分离率及报阳时间(time to positivity,TTP)的区别,探讨厌氧瓶和双套送检方式对血流感染病原菌检出的价值。方法回顾性分析2019年1月至2021年12月杭州师范大学附属医院临床送检的54582瓶血培养数据,分析厌氧瓶病原菌分离特点,比较厌氧瓶和需氧瓶病原菌分离率及TTP差异,分析双套送检方式病原菌分离数量特点。结果仅从厌氧瓶分离出的血培养病原菌占13.11%,血培养厌氧瓶TTP显著短于需氧瓶,差异有统计学意义(P<0.001)。双套送检标本阳性检出率高于单套送检标本阳性检出率,差异有统计学意义(P<0.05)。结论双套送检比单套或非成套送检血培养标本更能及时准确地分离病原菌。

孤岛微电网中二阶滤波器与PID控制器一体化参数整定方法

在孤岛微电网系统中,为降低测量噪声影响从而引入二阶滤波器;然而二阶滤波器的引入,通常使原系统PID控制器的最优参数发生改变,从而导致控制系统性能指标下降;为解决此问题,提出了一种一体化参数整定方法;该方法利用混合粒子群算法,以不同参数下,系统性能指标在Topsis综合评价法中的高得分作为寻优目标,一体化整定PID控制器与二阶滤波器的参数,保证滤波器的引入不会对系统性能指标造成较大改变,从而提升控制器性能;通过孤岛微电网系统仿真实验,验证了该方法的可行性与有效性。

工程隔振用聚氨酯微孔弹性体的研制

以改性MDI(MM103C)、HDI三聚体(HI100)、组合聚醚多元醇YZ-2101、聚合物多元醇POP-36/28、聚醚多元醇330N、3,3′-二氯-4,4′-二氨基二苯基甲烷(MOCA)、1,4-丁二醇(BDO)和发泡剂等为原料,采用半预聚体法制备了工程隔振用聚氨酯微孔弹性体材料,研究了材料密度和硬段含量对微孔弹性体性能的影响。结果表明,随着密度的增加,微孔弹性体拉伸强度、断裂伸长率逐渐增大;随着硬段含量的增加,微孔弹性体的拉伸强度和静刚度逐渐升高,断裂伸长率逐渐减小,压缩永久变形率和动静刚度比先降低后升高,硬段质量分数40%时达到最低值,分别为6.5%和1.22。