南极鲍鱼样品中有机氯农药的测定

报道了中国南极长城站周围及某国的一个排污口的鲍鱼样品中有机氯农药的残留量。测定结果显示鲍鱼样品中有机氯农药的含量HCHs为ND－1.87ng/g，DDTs为ND－6.61ng/g干重，有机氯农药的回收率为46％－75％。     

交通荷载作用下低路堤动力特性试验研究

结合连盐高速低路堤,对路堤进行了动应力、振动响应等现场测试,分析了路基中附加动应力及振动位移的变化规律.并且通过应力控制的室内动三轴试验,采用一定的动应力频率、不同的循环应力比来模拟交通荷载,研究了在循环荷载作用下,连盐高速公路饱和软粘土的轴向累计应变、孔隙水压力和轴向周期应变软化的变化规律.实验结果表明:路堤中动应力和振动位移随行车速度和车重的增加而增加,随深度的增加而降低,有效影响深度达2.5 m;原状土的临界循环应力比远大于重塑土,承受循环应力能力高于重塑土.因此,要加强浅层路基强度,同时要减少对底部下卧层软粘土的扰动.其结果可为在软土地基上设计和施工低路堤高速公路提供有益的参考.     

努力提高企业质量标准化管理水平

从多方面介绍了马兰矿在企业安全质量标准化管理方面的成果，并指出为使矿井质量标准化管理工作发挥长效作用应注重的几点工作。     

可编程超表面实现双极化独立多波束反射阵天线设计

多波束反射阵天线因其制备简单、成本低、波束调控灵活等优势而备受关注。基于极化复用的可编程超表面提出了一种双极化通道独立波束动态调控的多波束反射阵天线设计方法,并结合方向图快速计算与优化算法,实现了快速的编码序列优化与方向图预测。理论分析与全波仿真分析结果显示,反射阵天线在双极化通道下具有良好的辐射性能,主瓣辐射方向与理论计算结果一致。作为实验验证,加工了实物样件并在标准微波暗室中进行了测试。测试结果与仿真分析结果吻合良好,证明独立波束调控的双极化反射阵天线具有多通道电磁波辐射能力,有望应用于无线通信与多目标雷达系统中。     

N-(末端三甲基硅苄基甘氨酸肽链)邻苯二甲酰亚胺的光诱导单电子转移成环反应

以苄基甘氨酸为起始原料合成N-(末端三甲基硅苄基甘氨酸肽链)邻苯二甲酰亚胺(1).1在甲醇溶剂中光照发生单电子转移反应,生成分子内双自由基10,自由基偶合生成环聚甘氨酸肽化合物2.此反应产率好,区域选择性高.所有新化合物结构均经NMR和质谱验证.     

N-(带有不同离去基团的二供电子链)邻苯二甲酰亚胺衍生物的光诱导单电子转移环化反应

同时含有末端乙氧基醚支链和末端三甲基硅聚乙氧基醚支链的邻苯二甲酰亚胺衍生物1在高氯酸的甲醇溶液中发生光诱导单电子转移(SET)反应,以很高的反应区域选择性和很好的产率得到由末端三甲基硅聚乙氧基醚链环合构成的环状化合物.所有新化合物均经NMR和EI-MS确定其结构.     

Manipulating surface plasmon waves by transformation optics:Design examples of a beam squeezer,bend,and omnidirectional absorber

We present several design examples of how to apply transformation optics and curved space under coordinate transformation to manipulating the surface plasmon waves in a controlled manner.We demonstrate in detail the design procedure of the plasmonic wave squeezer,in-plane bend and omnidirectional absorber.We show that the approximation method of modifying only the dielectric material of a dielectric-metal surface of the plasmonic device could lead to acceptable performance,which facilitates the fabrication of the device.The functionality of the proposed plasmonic device is verified using three-dimensional full-wave electromagnetic simulations.Aiming at practical realization,we also show the design of a plasmonic in-plane bend and omnidirectional absorber by an alternative transformation scheme,which results in a simple device structure with a tapered isotropic dielectric cladding layer on the top of the metal surface that can be fabricated with existing nanotechnology.     

Manipulating surface plasmon waves by transformation optics: Design examples of beam squeezer, bend, and omnidirectional absorber

We present several design examples of how to apply the transformation optics and curved space under coordinate transformation to manipulating the surface plasmon waves in a controlled manner. We demonstrate in detail the design procedure of the plasmonic wave squeezer, in-plane bend and omnidirectional absorber. We show that the approximation method of modifying only the dielectric material of a dielectric-metal surface of the plasmonic device could lead to acceptable performance, which facilitates the fabrication of the device. The functionality of the proposed plasmonic device is verified using three-dimensional full-wave electromagnetic simulations. Aiming at practical realization, we also show the design of plasmonic in-plane bend and omnidirectional absorber by an alternative transformation scheme, which results in simple device structure with a tapered isotropic dielectric cladding layer on the top of the metal surface that can be fabricated with the existing nanotechnology.     

城市水资源短缺风险评价数学模型

利用北京市历史水资源信息,以缺水量作为参考序列,其他可能风险因素作为参照序列,通过灰色关联理论中计算关联度的方法,识别出主要风险因子,并对识别出的主要风险因子进行排序.     

Planar Metamaterial Microwave Absorber for all Wave Polarizations

We present a design for a polarization insensitive metamaterial absorber at 9.5 GHz by utilizing properly arranged resonant unit cells with orthogonal polarization sensitivity. Full-wave electromagnetic simulation demonstrates nearly perfect microwave absorption, which has been verified by experimental measurement with a maximum absorption of about 92% for incident wave with different polarizations. Furthermore, we find such a metamaterial thin absorber could work for a wide incident angle ranging from 0° to 50°with absorption no less than 80° for both the transverse electric mode and transverse magnetic mode.