基于陷波器参数自调整的伺服系统谐振抑制

针对永磁交流伺服系统中的柔性传动环节,建立电机——负载二质量模型,通过对模型的Simulink仿真分析阐述系统机械谐振发生的机理。为抑制伺服系统的机械谐振,根据对伺服系统谐振的定量分析,结合对电机速度误差信号的快速傅里叶变换（FFT）分析,设计自动调整参数的陷波滤波器,并进行仿真实验与实际实验。实验结果证实理论分析的正确性和所设计陷波器的有效性,在传动环节的刚度、阻尼和负载惯量不尽准确的情况下,相关仿真结果验证所设计陷波器依旧有效。     

基于磁耦合谐振的无线电能传输系统的研究

分析并设计实现了一种基于磁耦合谐振的无线电能传输系统.介绍了无线电能传输技术,阐述了磁耦合谐振式无线电能传输技术原理及其优越性,分析了磁耦合谐振无线电能传输系统中传输距离d及负载阻值RL等相关参数对系统传输功率、效率的影响.对所提出的无线电能传输系统进行实验测试,实验结果表明,需综合考虑上述相关参数,以达到传输效率、传...     

基于金纳米棒的DNA杂交检测

金纳米棒具有独特的光学性质与良好的生物适应性,在生物医学领域得到了日益广泛的应用.利用种子生长法,通过改变表面活性剂十二烷基二甲基苄基氯化铵(BDAC)的浓度所制备的8种不同长径比(AR)的金纳米棒,具有不同位置的纵向表面等离子共振(SPR)峰.在金纳米棒和非标记探针DNA的混合盐溶液中加入靶标DNA后检测,发现金纳米...     

基于域理论的自适应谐振神经网络研究

提出了一种基于域理论的自适应谐振神经网络算法 FTART,有机结合了自适应谐振理论和域理论的优势 ,以一种独特的方式解决了示例间冲突和分类区域的动态扩展 ,不仅不需要手工设置隐层神经元 ,可以还获得了较快的训练速度和较高的预测精度 .同时还提出了一种可以从训练好的 FTART网络中抽取可理解性好、精度高的符号规则的方法 ,即基于统计的产生测试法 .实验结果表明 ,用该方法抽取的符号规则可以较好地描述FTART的功能.     

环形管科里奥利质量流量计的激振和信号检测

本文给出了一种基于谐振式环形测量管科里奥利质量流计激振原理和信号检测方法,采用了模拟乘法器解调出幅度信号,通过幅信计算出质量流量,流体密度的检测是采用激振荡原理和频率跟踪方法得到的,本文还给出了激振原理和电路的方框图。     

Detection of sulphamethazine with an optical biosensor and anti-idiotypic antibodies

We describe the development of an assay for the detection of sulphamethazine in animal urine with a surface plasmon resonance (SPR) biosensor. In order to obtain a general assay that can easily be transferred to other veterinary drug residues, a monoclonal antibody against sulphamethazine and a corresponding anti-idiotypic antibody were used. The assay had a lower detection limit of 5 μg/l which is well below the maximum residue limits (MRL) of 100 μg/l and can be used for screening purposes in animal urine. The binding reaction between the antibodies as occurring during sensor application was characterized with respect to avidity and kinetic properties.     

一种基于小波分析的故障检测与诊断

小波分析是一种时变信号时-频两维分析方法.根据小波分析的思想,构造出一种新型机械设备故障诊断装置,使得机械故障的诊断结果更加准确,并在实际应用中取得了良好效果.实践证明这种拟小波理论的信号处理方法在故障诊断中是十分有效的.     

Ion-cyclotron resonance study of elementary stages of the catalytic oxidation of CO by N2O in the presence of VIA-group metal ions

Gas phase reactions of Mo⁺ and W⁺ ions with the molecules of various oxidants (NO, O₂, N₂O, CH₂O, C₂H₄O) were studied using ion cyclotron resonance. In oxidation with N₂O the mono-, di- and trioxide metal cations are formed consecutively. The trioxide MO₃ ⁺ ions of both metals react with CO to form CO₂ and MO₂ ⁺ ions. In this way, catalytic reaction N₂O + CO N₂ + CO₂ occurs in the gas phase with MoO₃ ⁺ /MoO₂ ⁺ and WO₃ ⁺/WO₂ ⁺ couples as catalysts. The rate constants have been measured for both stages of the catalytic cycle as well as for the stages of the catalyst preparation. Metal-oxygen bond energies were estimated for MoO_x ⁺ and WO_x ⁺ species with various x. The mechanism of CO oxidation with MoO_x ⁺ and WO_x ⁺ cations as catalysts in the gas phase is discussed in comparison with that for the oxidation over classical solid oxide catalysts.     

Semiempirical and ab initio conformational analysis of 2-methylene-8,8-dimethyl-1,4,6,10-tetraoxaspiro[4.5] decane with application of GIAO-SCF methods to NMR spectrum interpretation

The GIAO-SCF method for calculating isotropic nuclear magnetic shielding values has been utilized to explain certain features in the ¹H-NMR spectrum of 2-methylene-8,8-dimethyl-1,4,6,10-tetraoxaspiro[4.5] decane. Population distributions of the low-energy conformers based on their ab initio energies were used to produce weighting factors for the individual calculated shielding values to calculate the weighted average of the shielding values for a complete set of conformers. The differences in ¹H chemical shifts between the hydrogens of the two methyl groups and between the axial and equatorial hydrogens in 2-methylene-8,8-dimethyl-1,4,6,10-tetraoxaspiro[4.5] decane were shown to be due to energy differences between the chair and boat orientations of the six-membered ring and contribution from a twist-boat conformation. Results suggest a hypothesis that intramolecular differences in chemical shift might be calculated to a greater degree of accuracy than chemical shifts calculated relative to a standard.