SAMPLED-DATA STATE ESTIMATION FOR NEURAL NETWORKS WITH ADDITIVE TIME–VARYING DELAYS

In this paper, we consider the problem of delay-dependent stability for state estimation of neural networks with two additive time–varying delay components via sampleddata control. By constructing a suitable Lyapunov–Krasovskii functional with triple and four integral terms and by using Jensen's inequality, a new delay-dependent stability criterion is derived in terms of linear matrix inequalities(LMIs) to ensure the asymptotic stability of the equilibrium point of the considered neural networks. Instead of the continuous measurement,the sampled measurement is used to estimate the neuron states, and a sampled-data estimator is constructed. Due to the delay-dependent method, a significant source of conservativeness that could be further reduced lies in the calculation of the time-derivative of the Lyapunov functional. The relationship between the time-varying delay and its upper bound is taken into account when estimating the upper bound of the derivative of Lyapunov functional. As a result, some less conservative stability criteria are established for systems with two successive delay components. Finally, numerical example is given to show the superiority of proposed method.     

复合ZrO2/MgO催化发光丙烯醛气体传感器

设计了基于在纳米ZrO2中掺杂Mg0的催化发光传感器,以快速检测丙烯醛气体.与纯ZrO2相比,MgO的掺杂量为5%时,丙烯醛的催化发光强度增大了1.8倍,干扰气体乙醛的催化发光强度降为原来的约1/7.传感器在波长425 nm,温度279 ℃,流速200 mL/min条件下,对丙烯醛具有高灵敏度和选择性,发光强度与丙烯醛...     

HL-2M装置偏滤器冷却系统设计与分析

建立了HL-2M装置偏滤器水冷流道的等效三维模型,模拟分析了冷却水系统负载的温度和压降.构建了冷却系统的一维流体模型,分析了冷却系统工程设计的水力参数,并与模拟结果进行了比较,结果符合得较好.     

Fluorescence lidar for remote monitoring of plant

<正>The laser-induced fluorescence(LIF) characteristic of plant is directly linked to the photosynthesis.The LIF lidar for remote monitoring of plant has been suggested as one of the useful tools to identify plant species and determine its physiological status for a long time.So recently a LIF lidar for remote sensing of plant in Anhui Institute of Optics and Fine Mechanics is developed.It transmits laser beam at wavelength of 354.7 and 532 nm,and receives elastic echo and fluorescence echo at wavelength of 680 and 740 nm.Numerical simulations are carried out to determine achievable lidar performance including operation range.Validity of fluorescence signal is certified and then some results are presented.Comparison of the fluorescence characteristic among birch,conifer,and algae show that the fluorescence lidar is one of the potential tools to differentiate plant species.     

Microwave Absorbing Materials： Solutions for Real Functions under Ideal Conditions of Microwave Absorption

We present general equations for metal-substrate single-layer microwave absorbing materials. The optimum electromagnetic parameters and matching thicknesses for electric-loss, magnetic-loss, and electromagnetic-loss materials are given, and possible solutions for the equations and the corresponding theoretic curves are discussed as well. The results may be helpful for designing high-performance microwave absorbing materials.     

某些钕和铒的苯甲酸类配合物的超灵敏跃迁吸收光谱研究

研究了Ｎｄ~（３＋）和Ｅｒ~（３＋）与苯甲酸、水杨酸、对羟基苯甲酸、邻氨基苯甲酸、对氯苯甲酸和邻菲罗啉配体所组成的配合物在９５％乙醇中的ｆ－ｆ超灵敏跃迁吸收光谱。计算了超灵敏跃迁峰的振子强度Ｐ、电子云伸展比β、共价参数δ和键合多数ｂ~（１／２）。探讨了配合物的共价性。     

Structural Chemistry of Heteroselenometallic Clusters

1INTRoDUCTIoNThechemistryof[MS'j'-(M=Mo,W)anionsandtheirrelatedcompoundshavebeenextensivelyinvestigatedfortheirrelevancetobiologicalsystem,richstruc-turalchemistryandspecialreactivepropertiesaswellaspotentialapplicationinnon-linearopticalmaterials,t1~5iwhereasthatof[MSe'j'-(M=Mo,W)anionsandtheirrelatedcompoundshavereceivedattentiononlyinrecentyears.t6~7)Inl989lMhllerisolatedtwoclustercompounds,namely,cubane-like[OMoSe3Cl-(CuPPh,),j(siandlinear[WSe'(AgPPh,),).t9iAfterthat,lbersstud…     

静止颗粒体的应变与弹性

文章指出通过空间平均每个颗粒内应变的方法不能得到无粘性颗粒材料的宏观应变，位移矢 量场和应变张量场一般没有粗粒化平均性质.但这并不妨碍以平衡态热力学为基础的宏观应 变概念和弹性理论对静止颗粒体的有效性. 关键词： 无粘性颗粒体 应变 弹性 粗粒化     

纳米ZnS∶Mn~(2+)薄膜荧光增强动力学研究

利用有机溶胶方法制备了纳米ZnS∶Mn2 + 颗粒并将其分散在PVB薄膜中 ,观察到紫外辐照荧光增强的现象且增长倍数高于以前的报道。利用激发和发射光谱等手段对荧光增强的动力学过程进行了研究。认为纳米ZnS中元激发向Mn2 + 离子和表面态的能量传递是两个互相竞争的过程 ,紫外光辐照使表面态数目减少从而使Mn2 + 的发光增强 ,辐照后ZnS基质的 1P能级对Mn的激发更为有效。该样品在太阳光辐照下有相同的增强效应 ,可用来作为紫外光辐照剂量的探测材料     

核-壳结构的ZnS∶Cu/ZnS纳米粒子的制备及发光性质研究

制备了核-壳结构的ZnS∶Cu/ZnS纳米粒子以及普通的没有壳的Cu2 掺杂的ZnS纳米粒子,研究了ZnS无机壳层对ZnS∶Cu纳米粒子发光性质的影响。透射电子显微镜、激发光谱和发射光谱的研究表明,后加入的Zn2 离子在已经形成的ZnS核表面生长,形成ZnS壳层;而适当厚度的ZnS壳层可以钝化粒子表面,减少无辐射复合中心的数目,抑制表面态对发光的不利影响,提高ZnS∶Cu纳米粒子中Cu2 离子在450 nm左右的发光强度。