基于纳米材料修饰的高灵敏性L-苯丙氨酸印迹溶胶-凝胶传感器的研究

将氧化锌纳米膜(ZnO-NFs)、多壁碳纳米管(MWNTs)、纳米铜颗粒(Cu-NPs)和印迹溶胶-凝胶聚合物(MIP)依次修饰到碳电极(CE)表面,制备了一种对L-苯丙氨酸具有特异识别能力的印迹电化学传感器.采用电子扫描显微镜(SEM)对各修饰电极进行形貌表征;采用循环伏安法(CV)、示差脉冲伏安法(DPV)、安培时...     

浅谈游戏中的概率问题

近几年来,以游戏为载体的概率问题在中考试卷中经常出现.这些题目新颖有趣,既能极大的调动学生的学习积极性,又能较好的考查同学们应用数学知识分析问题、解决问题的能力,本文以2011年的中考试题为例,予以分析,供读者学习时参考.     

Robust Set Stabilization and Its Instances for Open Quantum Systems

We propose and discuss a novel concept of robust set stabilization by permissible controls; this concept is helpful when dealing with both a priori information of model parameters and different permissible controls including quantum measurements. Both controllability and stabilization can be regarded as the special case of the novel concept. An instance is presented for a kind of uncertain open quantum systems to further justify this generalized concept. It is underlined that a new type of hybrid control based on periodically perturbed projective measurements can be the permissible control of uncertain open quantum systems when perturbed projective measurements are available. The sufficient conditions are given for the robust set stabilization of uncertain quantum open systems by the hybrid control, and the design of the hybrid control is reduced to selecting the period of measurements.     

Mn/GaAs(100)界面电子结构的同步辐射光电子能谱研究

利用同步辐射光电子能谱,研究了室温下在GaAs(100)表面上淀积的Mn的超薄膜的电子结构.实验发现,在θ<2ML的覆盖度下,Mn3d电子的能量态密度分布与体金属α-Mn差别很大当θ>2ML之后,便逐步接近α-Mn的体电子结构.这一结果可由Mn3d电子的自旋向上带和自旋向下带的交换分裂很好地解释.由此推断,当覆盖度θ<2ML时,在GaAs(100)表面上淀积的Mn的超薄膜具有磁有序结构 关键词：     

分析特征 巧设函数 妙解一类数学压轴题

函数、导数、不等式的综合问题这一热点题型正逐渐作为众多省份的高考压轴题出现,这类问题以参数处理为主要特征,以导数运用为主要手段,以函数的单调性、极值、最值为结合点,特别是在最后一问中经常需要根据试题提供的信息再构造一个新函数,然后利用新构造的函数的     

ICP-MS检测青海省海西州地区羊板粪中的重金属元素含量

实验了电感耦合等离子体-质谱法(ICP-MS)测定羊板粪中的重金属元素Cr、As、Hg、Cd、Pb,优化了仪器的测定条件。方法检出限分别为:Cr 0.39、As 0.12、Hg 0.24、Cd 0.090、Pb 0.49ng/mL,方法精密度RSD:4.9%—14.3%,加标回收率92.0%—110.0%。方法适用于类似有机物样品中重金属元素的检测。     

火试金富集-AAS测定锑矿中的金

试样经火试金富集,稀硝酸,王水分解,用火焰原子吸收光谱法测定金,克服了试样经650℃灼烧王水溶解活性炭吸附原子吸收光谱法测定带来结果不稳定,精密度差返工率高等不足,缩短了分析时间,方法经国家一级标准物质验证结果与标准相符.     

中子输运方程的多重网格局部Fourier分析

1 引言 多重网格作为求解椭圆偏微分方程的快速有效方法而倍受欢迎.多重网格方法有两大要素:一是光滑,二是粗网格校正.     

双参数 C-半群

引入单参数C-半群和双参数C0-半群,给出了更一般的双参数C-半群和无穷小生成元的定义,应用双参数半群与单参数半群的关系和双参数半群的性质,给出了双参数C-半群的阶全微分,偏微分,指数有界性,和双参数C-半群是由C、A1和A2唯一确定的闭稠定线性算子的一个充分条件.     

Derivative of Electron Density in Non-Equilibrium Green's Function Technique and Its Application to Boost Performance of Convergence

The non-equilibrium Green＇s function （NEGF） technique provides a solid foundation for the development of quantum mechanical simulators. However, the convergence is always of great concern. We present a general analytical formalism to acquire the accurate derivative of electron density with respect to electrical potential in the framework of NEGF. This formalism not only provides physical insight on non-local quantum phenomena in device simulation, but also can be used to set up a new scheme in solving the Poisson equation to boost the performance of convergence when the NEGF and Poisson equations are solved self-consistently. This method is illustrated by a simple one-dimensional example of an N＋＋ N＋ N＋＋ resistor. The total simulation time and iteration number are largely reduced.