真空原位水热合成法快速合成A型分子筛膜

采用真空原位水热法在管状αAl2O3基膜上快速合成了A型分子筛膜;采用XRD和SEM方法表征了膜的性质;研究了真空度对A型分子筛膜性能的影响。在外加真空作用下,分子筛晶粒可以均匀、快速地迁移到基膜表面形成分子筛膜,从而可以在较短时间里合成均匀、连续的分子筛膜。     

Resolution and noise in ghost imaging with classical thermal light

The resolution and classical noise in ghost imaging with a classical thermal light are investigated theoretically. For ghost imaging with a Gaussian Schell model source, the dependences of the resolution and noise on the spatial coherence of the source and the aperture in the imaging system are discussed and demonstrated by using numerical simulations. The results show that an incoherent source and a large aperture will lead to a good image quality and small noise.     

新型有机荧光染料嵌合的核壳荧光纳米材料的研制

采用油包水的反相微乳液方法,首次以羊抗人免疫球蛋白(IgG)标记的异硫氰酸荧光素(FITC)为核材料,成功地制备了FITC的核壳荧光纳米颗粒,克服了采用传统方法制备核壳荧光纳米颗粒中存在的荧光染料泄露的问题.制备的这种核壳荧光纳米颗粒比细胞小很多,且具有生物亲和性,可为纳米生物传感器件提供新型材料.基于该核壳荧光纳米颗粒的标记方法也为生物医学提供了一种新型的非同位素分析方法.     

Controlled teleportation of multi-qudit quantum information

We propose a scheme for realizing a controlled teleportation of random $M$-qudit quantum information under the control of $N$ agents. The resource consumption includes a prearranged $(2M + N + 1)$-qudit entangled quantum channel and $(2M + N + 1)\log _2 d$-bit classical communication. And the quantum operations used in the teleportation process are a series of generalized Bell-state measurements, single-qudit measurements, qudit $H$-gates, qudit-Pauli gates and qudit phase gates. It is shown that the original state can be restored by the receiver only on condition that all the agents work in collaboration with each others. If one agent does not cooperate with the other, the original state cannot be fully recovered.     

Experimental study on imploding characteristics of wire-array Z pinches on Qiangguang-1 facility

To investigate the imploding characteristics of cylindrical wire array, experiments with load current varying from 1.5\,MA to 1.7\,MA were carried out on the Qiangguang-1 facility. The complicated temporal-spatial distribution of x-ray radiation was measured by the one-dimensional (1D) x-ray imaging system. Other diagnostic equipments including the x-ray power meter (XRPM) and the time-integrated pinhole camera were used to record time-resolved x-ray power pulse and pinhole x-ray images. Analysis shows that the fast leading edge of the local x-ray radiation pulse is of primary importance in sharpening x-ray power pulse rather than the temporal synchrony and the spatial uniformity of implosion. Experimental results indicated that the better axial imploding synchrony, the faster the increase of x-ray power for an array consisting of 32 tungsten wires of 5\mum diameter than for the others, and the higher the x-ray radiation power with maximal convergence ratio (r_0/r_1) of 10.5. A `zipper-like' effect of x-ray radiation extending from the anode to the cathode was also observed.     

Generalized oscillator strengths for some higher valence-shell excitations of krypton atom

The valence-shell excitations of krypton atom have been investigated by fast electron impact with an angle-resolved electron-energy-loss spectrometer. The generalized oscillator strengths for some higher mixed valence-shell excitations in 4d, 4f, 5p, 5d, 6s, 6p, 7s $\leftarrow$ 4p of krypton atom have been determined. Their profiles are discussed, and the generalized oscillator strengths for the electric monopole and quadrupole excitations in $5\p \leftarrow 4\p$ are compared with the calculations of Amusia \it et al. (\it Phys. Rev. A \textbf67 022703 (2003)). The differences between the experimental results and theoretical calculations show that more studies are needed.     

高层建筑风振时地基土材料阻尼比取值范围的初探

高层建筑风振响应分析中考虑土与结构相互作用后地基土的材料阻尼比幅值是多少,这是考虑土与结构相互作用对高层建筑结构风振响应有利还是不利的关键问题.通过对无桩基桩架-剪力墙结构的顺风向风振响应分析,发现考虑土-结构相互作用时结构基础底面土体的动剪应变幅值处于弹性应变范围,根据土动力学中土的动剪应变与土的阻尼比的关系,土体的材料阻尼比较小,其值不超过0.03,据此计算出相应的结构最大层间位移和结构顶层的最大加速度比将地基视为刚性的结构有较大增长;因此,在高层结构风振响应分析中应考虑土-结构相互作用的影响.文章通过实例分析给出无桩基高层建筑土体材料阻尼比的建议值,该研究为有桩基高层建筑的土体材料阻尼比的计算提供了借鉴.     

杆系结构多荷载识别的三角级数分析法

本文提供了一种识别杆系结构受到多荷载的作用的三角级数识别方法.将集中荷载展成三角级数且借助结构力学中的位移法建立了单根基本梁(梁单元)的位移方程,利用位移测量值反演所受到的集中荷载大小和位置.算例表明本文所用级数收敛性较好,可获得稳定的收敛值.     

小学科学教育中的趣味化学实验

从5个方面阐述趣味实验的意义并举例说明,为小学科学教师提供了可以借鉴的理论依据,对激发小学生的主观能动性,培养动手能力,培养开拓、创新及合作精神,具有很好的理论及现实意义.     

MgO掺杂对PMMN四元系压电陶瓷结构与性能的影响

采用固相烧结法制备添加过量MgO的铌镁-铌锰-锆钛酸铅(PMMN)四元系压电陶瓷材料,研究了不同MgO掺杂量对材料结构及压电介电性能的影响.实验结果表明,适量MgO掺杂,不仅不改变PMMN压电陶瓷的钙钛矿相结构,且能提高合成粉体的晶化程度,降低陶瓷的烧结温度,改善材料的压电介电性能.当MsO掺杂量为0.25;质量分数,1130℃烧结的样品性能参数为:d33=310 pC/N,Qm=1008,kp=0.61,tan δ=0.34;,ε33T/ε0=1494,是一种中温烧结功率型压电陶瓷材料,适用于多层压电变压器,超声马达等器件.