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非线性超谐共振时效系统弹簧设计方法的研究

机械设计与制造 2024年第8期402卷 23-27,32页

作者：莫荣献郭晓东赵丽芳李岩舟广西大学机械工程学院广西南宁530004

为解决难以获取满足非线性超谐共振时效系统所需要的非线性参数,以系统的核心元件—非线性弹簧为研究对象,提出了适用于此系统的不等节距圆柱螺旋弹簧结构参数设计的方法,从而实现系统所要达到的超谐共振。首先,依据工件振动时效所需的... 详细信息

为解决难以获取满足非线性超谐共振时效系统所需要的非线性参数,以系统的核心元件—非线性弹簧为研究对象,提出了适用于此系统的不等节距圆柱螺旋弹簧结构参数设计的方法,从而实现系统所要达到的超谐共振。首先,依据工件振动时效所需的弹簧力学特性曲线,计算得到符合该系统用不等节距圆柱螺旋弹簧的结构参数。其次,通过弹簧压缩试验证明了该弹簧设计方法的可行性。最后,以圆柱工件为试验对象,搭建非线性超谐振动台进行试验研究。结果表明:运用此方法设计的不等节距螺旋弹簧作用下的非线性超谐振动试验台能够产生超谐振动,且可产生高于200Hz的高次超谐频率,对推广非线性超谐式共振时效方法在消减高刚工件的残余应力方面具有重要的意义。

关键词：非线性超谐共振非线性弹簧弹簧设计振动时效

负压脉动清洗消毒器清洗腹腔镜手术器械的应用研究

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中国医疗器械信息 2024年第18期30卷 174-176页

作者：李燕周小芳魏俊新疆生产建设兵团第一师医院新疆阿克苏843000

目的:对腹腔镜手术器械使用负压脉动清洗消毒器的应用效果进行探讨。方法:选取440件腹腔镜手术器械,经2023年7月~2023年12月本院手术室使用回收后,随机分为观察组和对照组,每组220件。对照组采用人工清洗与超声清洗相结合的方式进行,观... 详细信息

目的:对腹腔镜手术器械使用负压脉动清洗消毒器的应用效果进行探讨。方法:选取440件腹腔镜手术器械,经2023年7月~2023年12月本院手术室使用回收后,随机分为观察组和对照组,每组220件。对照组采用人工清洗与超声清洗相结合的方式进行,观察组则采用负压脉动清洗消毒器进行清洗。清洗效果的评估采用三种方法:8倍带光源放大镜法、白通条检测法、残留蛋白检测法。结果:通过8倍带光源放大镜目测法测试,对照组合格率为96.82%,观察组合格率为99.55%,统计学分析显示两者差异明显(χ2=4.583,P=0.032)。采用白通条检测法检测后发现,对照组合格率为95.45%,观察组合格率为98.64%,两者之间的差异在统计学上是有意义的(χ2=3.884,P=0.049)。经对残留蛋白检测方法检测,对照组合格率为92.27%,观察组合格率为96.82%,经统计学分析发现差异显著(χ2=4.407,P=0.036)。结论:采用负压脉动清洗消毒器比采用人工清洗与超声清洗相结合的方式清洗效果更好,可以更有效地清洗已使用的腹腔镜器械。

关键词：负压脉动清洗消毒器腹腔镜手术器械清洗效果

Impact of supercritical adsorption mechanism on research of hydrogen carrier

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Chinese Science Bulletin 2007年第8期52卷 1146-1152页

作者： SUN yan zhou li SU Wei zhou YaPing Adsorption Laboratory of the Key State Laboratory of Chemical Engineering Tianjin University Tianjin 300072 China

Hydrogen storage receives the worldwide attention due to its importance in sustainable energy and the solution of greenhouse *** provides an efficient way to compress gases and,therefore, has been applied to the development of hydrogen storage ***,hydrogen is a super- critical gas at the temperature of engineering interest and follows a different adsorption mechanism compared to the sub-critical *** present work shows why only monolayer coverage mechanism functions at above-critical temperatures and what consequences will result in the application study. Although there are pros and cons to this point of view,understanding the adsorption mechanism is,in- deed,essential for the research of hydrogen storage method since it claims that any storage material based on adsorption will not satisfy the practical need of on board storage no matter how novel the material is.

关键词：超临界吸附机制氢能载体储氢材料

Global Periodic Attractor for Strongly Damped and Driven Wave Equations

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Acta Mathematicae Applicatae Sinica 2006年第1期22卷 75-80页

作者： Hong-yan li Sheng-fan zhou Department of Mathematics Shanghai University Shanghai 200444 China

In this paper we consider the strongly damped and driven nonlinear wave equations under homogeneous Dirichlet boundary conditions. By introducing a new norm which is equivalent to the usual norm, we obtain the existence of a global periodic attractor attracting any bounded set exponentially in the phase space, which implies that the system behaves exactly as a one dimensional system.

关键词： Wave equation global periodic attractor equivalent norm

A new 3D cupric coordination polymer as chemiresistor humidity sensor:narrow hysteresis,high sensitivity,fast response and recovery

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Science China Chemistry 2017年第9期60卷 1197-1204页

作者： Xiao-Jing Lv Ming-Shui Yao Guan-E Wang yan-zhou li Gang Xu State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of Sciences University of Chinese Academy of Sciences Chinese Academy of Sciences

A new three-dimensional coordination polymer composed of Cu2+ centres and semiquinoid linkers (dhbq(2-)) was synthesized which was composed by two independent, enantiomeric, interpenetrated [Cu-2(dhbq)(3)](2-) networks with (10,3)-a topology. The compound has good water stability and typical behaviors of semiconductor, whose conductivity increases along with raising temperature. The chemiresistive humidity sensor made from this material shows good properties including linear sensitivity, high response, fast response and recovery, and particularly narrow hysteresis during humidity adsorption and desorption.

关键词： coordination polymer, chemiresistive humidity sensor, narrow hysteresis, fast response & recovery

Translocation of a Self-propelled Polymer through a Narrow Pore

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Chinese Journal of Polymer Science 2022年第12期40卷 1670-1678,I0010页

作者： Chao Wang Han-Xian Hu yan-li zhou Bin Zhao Meng-Bo Luo Department of Physics Taizhou UniversityTaizhou 318000China Department of Physics Zhejiang UniversityHangzhou 310027China

Recent studies indicate that active polymers often show curious conformational and dynamical ***,rigid polymers with self-propelled tangential forces can move directionally and even push a *** by this,the tran slocation of an active bead-spring polymer through a narrow pore is studied simulationly in this *** bead of the polymer is propelled by a tangential active force(f) along the contour of the *** results show that the active polymer translocates through the pore in a railway-motion *** tran slocation velocity v of the polymer is determined only by f,resulting that the translocation time(r) as a function of the polymer length(N)and the active force fcan be expressed as τ∝ Nf,which is independent of the rigidity of the *** results indicate that the tran slocation dynamics of active polymers is quite different from that of passive polymers.

关键词： Active polymer Translocation Dynamics Simulation

Bipolar Thermoelectrical Transport of SnSe Nanoplate in Low Temperature

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Chinese Physics Letters 2020年第1期37卷 69-73页

作者： li-yan zhou Qi Zheng li-Hong Bao Wen-Jie liang Beijing National Center for Condensed Matter Physics Beijing Key Laboratory for Nanomaterials and NanodevicesInstitute of PhysicsChinese Academy of SciencesBeijing 100190 CAS Center of Excellence in Topological Quantum Computation and School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190 Songshan Lake Materials Laboratory Dongguan 523808

Bulk SnSe is an excellent thermoelectrical material with the highest figure-of-merit value of ZT=2.&making it promising in ***-dependent electrical and thermoelectrical properties of SnSe nanoplates are studied at low *** drops and rises again as temperature is *** Seebeck coefficient is positive at room temperature and becomes negative at low *** change of the sign of the Seebeck coefficient indicates influence of bipolar transport of the semiconductive SnSe *** bipolar transport is caused by the Fermi energy changing with temperature due to different contributions from donors and acceptors at different temperatures.

关键词： plate highest Thermoelectric

An automatic Q-factor matching method for eliminating 77%of the ZRO of a MEMS vibratory gyroscope in rate mode

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Microsystems & Nanoengineering 2024年第3期10卷 35-48页

作者： Jingbo Ren Tong zhou Yi zhou Yixuan li yan Su School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210000China

Mismatching quality factors(Q-factors)is one of the main factors causing zero-rate output(ZRO)in degenerate(DE)Micro-Electro-Mechanical Systems(MEMS)vibratory *** eliminate the ZRO of the DE MEMS gyroscope,this study introduces a method for real-time identification and automatic matching of Q-factors in rate *** leveraging the vibration characteristics of the DE MEMS vibratory gyroscope in rate mode,dedicated online test methods are designed to determine the Q-factors for both the drive and sense modes,enabling online identification of the Q-factor ***,an automatic Q-factor matching system is designed utilizing the mechanical-thermal dissipation mechanism of the resistive *** effectiveness of this proposed method is validated through simulations and experiments conducted on a MEMS disk resonator gyroscope(DRG).The results show a measurement error within 4%for Q-factor identification,and automatic Q-factor matching effectively reduces the ZRO by 77%.Employing this automatic Q-factor matching method successfully reduces the ZRO that is caused by the mismatching of Q-factors in the MEMS DRG from 0.11°/s to 0.025°/s and improves the bias instability(BI)from 0.40°/s to 0.19°/s.

关键词： matching mode method

Quantum properties near the instability boundary in optomechanical system

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Chinese Physics B 2022年第3期31卷 201-207页

作者： Han-Hao Fang Zhi-Jjiao Deng Zhigang Zhu yan-li zhou Department of Physics College of Liberal Arts and SciencesNational University of Defense TechnologyChangsha 410073China Interdisciplinary Center for Quantum Information National University of Defense TechnologyChangsha 410073China Department of Physics Lanzhou University of Technology Lanzhou 730050China

The properties of the system near the instability boundary are very sensitive to external disturbances, which is important for amplifying some physical effects or improving the sensing accuracy. In this paper, the quantum properties near the instability boundary in a simple optomechanical system have been studied by numerical simulation. Calculations show that the transitional region connecting the Gaussian states and the ring states when crossing the boundary is sometimes different from the region centered on the boundary line, but it is more essential. The change of the mechanical Wigner function in the transitional region directly reflects its bifurcation behavior in classical dynamics. Besides, quantum properties, such as mechanical second-order coherence function and optomechanical entanglement, can be used to judge the corresponding bifurcation types and estimate the parameter width and position of the transitional region. The non-Gaussian transitional states exhibit strong entanglement robustness, and the transitional region as a boundary ribbon can be expected to replace the original classical instability boundary line in future applications.

关键词： optomechanical system instability boundary transitional region quantum properties