具有衰减测量和随机时滞的离散非线性复杂网络的保概率集员滤波

研究一类离散非线性复杂网络的保概率集员滤波问题.考虑网络节点受状态随机时滞、衰减测量等影响,为了更贴合实际,采用两类相互独立的随机变量分别描述状态时滞和测量衰减特征.引入Bernoulli随机变量将随机时滞刻画为随机发生时滞,引入在某区间上服从已知概率分布的随机变量刻画衰减测量.文章设计一个分布式集员滤波器,给出滤波误差系统所需满足的充分条件以保证滤波误差被限制在已知椭球集内的概率不小于已给定的概率值,且该充分条件由一个递推线性矩阵不等式表示;建立在矩阵迹最小意义下的凸优化问题以最小化每个时刻所获得的概率椭球集,并设计一个保概率集员滤波器增益矩阵的求解算法.最后,通过一个数值算例验证所设计的滤波设计方案的有效性.     

高效液相色谱法测定微量全血中维生素A

建立了反相高效液相色谱法测定微量全血样品中维生素A的方法。取全血50μL,用100μL无水乙醇沉淀蛋白后,加入400μL×2正己烷漩涡混匀提取维生素A,高速离心分层后取正己烷层在弱氮气流下挥干,加100μL甲醇溶解后用反相色谱柱C8(150 mm×4.6 mmi.d.,5μm)分离,紫外检测波长325nm,外标法定量。色谱条件:柱温,60℃;流动相为V(甲醇)∶V(水)=92∶8;流速:0.8 mL/min。用本法同时测定了27例成人微量全血及其血清中的维生素A。标准曲线的相关系数大于0.999;相对标准偏差(RSD)小于5%。对于50μL全血,方法检出限为0.02μg/mL。加标回收率为88%~115%。成人血清与其全血中维生素A含量之比为2.907±0.160(x-±s)。方法适合于微量全血中维生素A的测定,并可以通过测定全血中维生素A含量推算血清中维生素A的含量。     

二级热脱附-气相色谱-质谱联用测定大气可吸入颗粒物中的16种多环芳烃

建立了二级热脱附-气相色谱-质谱联用技术测定大气可吸入颗粒物PM10中16种多环芳烃的分析方法。对二级热脱附和色谱-质谱条件进行了优化。实验结果表明,方法的检出限为0.14～0.42 ng/m3,平均加标回收率为52.7%～97.9%,相对标准偏差(RSD)为8.0%～18.4%。与传统方法相比,该方法的样品前处理时间短、有机溶剂的使用量少,是对人体及环境友善的检测技术。该方法已应用于32份实际大气颗粒物样品的分析。     

基于matlab的星图背景提取数字滤波器设计与分析

在星敏感器系统中，对星图进行处理提取星点是很关键的一步，本文就是围绕星点提取来设计背景估计数字滤波器，并对在相同条件下所设计出的滤波器进行比较分析，得出了一定的结论。数字滤波器的设计是基于matlab信号处理工具箱的，这种设计滤波器的方法简化了流程，结果直观，易于实现。     

优化分离与鉴定蓝斑背肛海兔口腔神经节蛋白质组

采用双向凝胶电泳技术优化分离蓝斑背肛海兔(Notarcus leachii cirrosus Stimpson, NLCS)口腔神经节(Buccal Ganglion, BG)蛋白质组, 并获得约300个蛋白质斑点. 用组合基质辅助激光解吸电离化飞行时间(MALDI-TOF)质谱技术和胶内酶解技术测定BG蛋白质组中的96个蛋白质斑点的肽指纹(Peptide mass fingerprint, PMF)图谱. 经数据库检索与比对后, 发现96种蛋白质中仅有4种蛋白质可获得较高的匹配率, 它们分别是微管蛋白(Tubulin)、 肌动蛋白(Actin)和两个1,5-二磷酸核酮糖-羧化酶/加氧酶(Ribulose-1,5-bisphosphate carboxylase/oxygenase, Ribulose), 均属于神经细胞骨架蛋白质; 同时还发现一种交配信号肽前体(Peptide mating pheromone precursor). 利用LOCtrees软件和分类法对56种蛋白质进行亚细胞定位与分类.     

Structure change of 156Yb at high-spin states

High-spin states of ¹⁵⁶Yb have been studied via the ¹⁴⁴Sm(¹⁶O,4n)¹⁵⁶Yb fusion-evaporation reaction at beam energy 102~MeV. The positive-parity yrast band and negative-parity cascade have been extended up to higher-spin states, respectively. The characteristics of the negative-parity sequence above the 25^－ state may related to the excitation from the nucleon in the Z=64, N=82 core. The E-GOS curve for the positive-parity yrast sequence in ¹⁵⁶Yb indicate that this nucleus may undergo an evolution from quasivibrational to quasirotational structure with increasing angular momentum. The Cranked Woods-Saxon-Strutinsky calculations by means of Total-Routhian-Surface (TRS) methods has been made to understand this structure change.     

Design and Application of a Near Field Microwave Antenna for the Spin Control of Nitrogen-Vacancy Centers

Controlled manipulation of the electron spin by means of a microwave field is investigated. The near magnetic field generated by a copper wire antenna is measured experimentally and simulated theoretically, and the optimum antenna length and position are obtained. By measuring the change in the fluorescence of nitrogen-vacancy （N-V） centers in diamond after excitation with a 532 nm continuous wave laser at room temperature, it is verified that the spin of the N-V center can be effectively controlled by the microwave field.     

顶空固相微萃取-气相色谱质谱联用技术分析甜樱桃芳香成分

采用固相微萃取技术(SPME)提取‘红灯’甜樱桃果实芳香成分,运用气相色谱-质谱-计算机联用技术进行芳香成分分析,共检测出41种芳香成分,占总峰面积的98.81%,质量分数较高的芳香成分依次为反-1,4-己二烯、己醛、2-己烯醛、(E)-2-乙烯-1-醇、1-己醇、乙醇(、E,E)-2,4-己二烯醛、己酸乙酯、苯甲醛等。     

Optical bistability induced by quantum coherence in a negative index atomic medium

Bistability behaviors in an optical ring cavity filled with a dense V-type four-level atomic medium are theoretically investigated. It is found that the optical bistability can appear in the negative refraction frequency band, while both the bistability and multi-stability can occur in the positive refraction frequency bands. Therefore, optical bistability can be realized from conventional material to negative index material due to quantum coherence in our scheme.