高斯光束共焦扫描激光显微镜的光学传递函数

考虑光源和探测器有一定大小，并引入光源的高斯分布函数，求出此接近实际的共焦扫描成像系统的光学传递函数(OTF)；运用计算机进行数值模拟并讨论光源针孔和探测针孔的大小对横向、纵向分辨率的影响.所得结果在不影响共焦扫描成像系统三维(3D)成像能力的基础上，可以有效地提高系统的信噪比. 关键词：     

分光光度法测定克什克腾旗热水泉泉水中的硒

采用硒 -硫氰酸钾 -罗丹明 B-明胶 - OP体系分光光度法 ,在 5 80 nm波长下测定了克什克腾旗热水泉泉水中的硒 ,含量为 8.5 2— 9.0 5 μg·m L-1。回收率为 89%— 10 1%。     

用纵横波声时比法测螺栓轴力精度研究

用纵横波测量螺栓轴力的技术已取得较大发展,本文介绍了纵横波比值法原理,通过理论推导,获得比值法计算的简易公式。建立试验平台,用现场用螺栓进行标定和测量,得出比值法在工程实践状态下的测量误差为10%以内,基本能满足工程应用的要求。此外,针对试验结果,本文还初步探讨了误差出现的原因以及提高精度的方法。本文介绍的比值法,无需精确测量标定螺栓长度和纵横波声速,现场应用更加简洁,具有较大的工程应用价值。     

中国证券市场的高维混沌现象分析

将高维混沌理论应用到中国证券市场的分析之中,指出了当前许多文献中计算中国证券市场混沌特征指数出现较大差异的原因.通过比较上证综合指数与英国M organ S tan ley C ap ita l In ternationa l指数后指出,中国证券市场较复杂,且存在较多的高维(接近四维)混沌成分.     

中孔复合锆-铝氧化物微球的制备及其正相色谱性能研究

复合氧化物通常表现出与单一氧化物不同的物理化学性质（如晶体结构、孔结构和表面性质等方面）,已广泛用作催化剂、吸附剂和离子交换剂。1993年,Kaneko等采用共沉淀法制备的SiO2-TiO2,SiO2-Al2O3等复合氧化物的环境保护、痕量富集、氨基酸分离等方面取得较好的应用效果。但复合氧化物作为液相色谱固定相的研究很少报道。近年来,我们从制备、表征到正相、反相色谱性能等方面对MgO-ZrO2和SiO2-ZrO2复合氧化物作为色谱填料进行了系统的研究,发现MgO和SiO2掺杂可以有效地改善ZrO2的孔结构,提高柱效。本文用溶胶－凝胶方法制备了质量投料比m（硝酸铝）：m（氧氯化锆）＝20：64的ZrO2-Al2O3复合氧化物微球,考察酸腐蚀前后其晶形、表面酸碱性和孔容、孔径的变化,以及它们的正相色谱性能。     

宽温低损耗单模光纤定向耦合器

本文报道了用熔融法由常规的单模通信光纤制造宽温工作的低损耗单模光纤定向耦合器.工作波长为1.52μm,分束比为50%的封装器件;工作温度在-30～+70℃范围,分束比容差小于±5%,插入损耗<0.2dB,隔离度>40dB.工作波长的变化对分束比影响十分明显,但入射光的偏振态对其无实际影响.     

A new generalization of Hardy–Berndt sums

In this paper, we construct a new generalization of Hardy–Berndt sums which are explicit extensions of Hardy–Berndt sums. We express these sums in terms of Dedekind sums s _r (h, k : x, y|λ) with x?=?y?=?0 and obtain corresponding reciprocity formulas.     

Low Frequency Ultra-Thin Compact Metamaterial Absorber Comprising Split-Ring Resonators

We present a design of a low frequency ultra-thin compact and polarization-insensitive metamaterial absorber （MA）. The designed MA is a two-layer structure, a periodic array of novel split-ring resonators （SRRs）, which are constructed in an FR4 dielectric layer, and another ultra-thin grounded sheet is attached to the bottom. Numerical simulated results show that the proposed MA can realize effective absorption at the frequency 281.9 MHz, and its overall thickness is just only 0.29% of the resonant wavelength, the unit space is only 2.57%, and the absorbanee is kept well for a wide range of incident angles for different polarizations. In addition, the proposed MA is changed into a more compact one when the inter-digital structures are introduced in the SRRs. One convenient experiment is carried out in a rectangular waveguide simulator.     

A cDNA CLONE WITH ANTIONCOGENE ACTIVITY

A cDNA clone, p14--6, which has an antioncogene activity on the v--Ki--Ras oncogene-transformed malignant cell line DT, was found. This clone was recovered from the revertantR14 cells, which had been isolated by transfections of DT cells with a normal human fibro-blast cDNA library cloned in pcD2, an Okayama-Berg vector. When transfected into DT cells,p14--6 clone gave rise to phenotypical flat reversion in 5--15% of DT transfectant colo-nies. The p14--6--transfected flat cell line, RR, was proven to be a true revertant with signif-icantly reduced malignancy by in ritro and in riro malignancy tests. All other clones recov-ered from R14 cells were unable to cause this reversion. Molecular hybridizations showedthat the p14--6 was inserted into RR genome as tandem repeats, and no structural changewas found in the D--Ki--Ras oncogene in RR genome. These facts suggest that the antioncogeneactivity of the p14--6 clone on the DT cells may be exerted through expression of thecDNA contained in this clone. Possib