Crystal Structures,Terahertz Spectra and Dye Adsorption Performance of Three Lanthanide-bisphosphonate Complexes Containing Keggin Polyoxometalates

Three lanthanide complexes[LnL3(H2O)]PMo12O40·CH3CN(Ln = Dy3+for 1,Ln = Ho3+for 2,Ln= Lu3+for 3,L = tetraethyl ethylenediphosphonate)have been synthesized,and c...     

甲胺磷离子选择性电极的研制及其应用

以四苯硼钠与甲胺磷在盐酸介质中生成的离子缔合物为电活性物质,首次研制出一种甲胺磷PVC涂层玻璃电极。并对该电极的响应机理及性能进行了研究。实验表明,该电极的Nernst响应范围为1×10-2~1×10-4(φ),斜率为50.28 mV/pφ。该电极响应迅速,重复性好,用于蔬菜中残留甲胺磷的测定,方法快速、准确,结果满意。     

新型聚乙烯接枝共聚物的制备与表征

以聚氧乙烯和全氟辛基聚氧乙烯醚(FPEOE)为起始原料, 合成了一系列的特种氟表面活性剂及其丙烯酸酯, 用FTIR和1H NMR对其结构进行了表征, 用最大气泡法测定了其表面张力. 以其作为接枝单体, 利用反应挤出接枝的方法制备了系列功能化聚乙烯, 用FTIR确定了接枝共聚物的结构和接枝率; 用DSC、接触角测量仪和XPS对接枝共聚物的热性能、结晶行为和表面性能进行了测试分析. 结果表明, 随着聚氧乙烯分子量的增加, 氟表面活性剂的表面活性降低; 聚乙烯接枝共聚物的结晶温度高于线形低密度聚乙烯, 且具有较好的亲水性.     

Phenol Solvothermal Synthesis of JBW-Type Zeolites

Phenol was used as an aromatic and acidic solvent in solvothermal synthesis.JBW-type zeolites were successfully synthesized in a phenolic system.The as-synthesized microporous crystals were characterized by powder X-ray diffraction analysis and scanning electron microscopy techniques.The results indicate that phenol is a good organic solvent and has a huge potential of application in studying crystallization mechanism and synthesizing novel microporous materials.     

氯铝酸离子液体的酸性及其催化烷基化反应研究

分别采用吡啶探针和乙腈探针红外光谱法研究了氯铝酸离子液体的酸性,结合固体酸表征方法,研究了离子液体的酸性对吡啶探针各振动模式的影响。发现当氯铝酸离子液体AlCl₃的摩尔分数x为0.4～0.5时,离子液体显弱Lewis酸性,强碱性吡啶探针分子能很好地表征离子液体的酸性,而弱碱性乙腈探针分子只适用于表征酸性较强的离子液体。考察了氯铝酸离子液体酸强度对苯与长链烯烃烷基化反应的影响,结果发现,AlCl₃的摩尔分数x≤ 0.5时,离子液体没有催化活性;x>0.55时,随着离子液体酸性的增强,烯烃转化率升高,但2位烷基苯选择性下降。结合离子液体的酸强度对烷基化反应机理进行初步分析认为具有催化活性的物质是强Lewis酸Al₂Cl-₇。     

扇贝微量元素的测定

以高压硝化罐消化样品,利用电感耦合等离子体原子发射光谱(ICP-AES)法和火焰原子吸收(AAS)法分别测定了扇贝中的Zn,Co,Fe,Mn,Mg,Ca,Cu,K共八种微量元素的含量, 并对两种分析方法进行了分析比较b 结果表明,ICP-AES法和AAS法测定的微量元素无显著性差异, ICP-AES稍优。方法回收率在93.3%～102.8%之间,相对标准偏差均小于1.60%。扇贝含有丰富对人体有益微量元素,不但味道鲜美,而且可以补充人体所必需的微量元素。     

不同地区人发中微量元素的测定与生存环境的比较研究

采用高压密封消化罐对人发样品进行处理,将化学计量学应用于ICP-AES法测定了人头发中20种微量元素的含量。该方法操作简单、快速、灵敏度高,准确性好, 且多元素同时测定,回收率在94.07%～107.60%之间。相对标准偏差小于3.49%。通过对不同地区不同年龄1 600人头发的测定结果,探讨了营养、环境污染等因素对人体健康的影响,从而对其生存环境进行比较研究。     

Broadband Convergence of 40 GHz-ROF and 10-Gb/s WDM-PON Systems in the Duplex Access Network

A broadly converged 40G-ROF and 10-Gb/s WDM-PON multi-service access system is proposed and exper- imentally demonstrated. This scheme consists of an integrated system of 40G-ROF and 10-Gb/s WDM-PON simultaneously transmitting independent 2.5-Gb/s wireless and 10-Gb/s wire signal. At the base station, it employs a remodulation scheme, which is achieved by remodulating the upstream OOK signal on the DPSK downstream signal, to reduce the cost of the base station. The transmission experiment is carried out over a 25-km-long single mode fiber （SMF-28）. The results show that the sensitivities of downstream PON and ROF signal are -14.5 dBm and -21.5 dBm, respectively, and the sensitivity of upstream signal is -25.3 dBm.     

Asymmetric Heat Conduction in One-Dimensional Hard-Point Model with Mass Gradient

The heat conduction in a one-dimensional （1D） hard-point model with mass gradient is studied. Using numerical simulation, we find an asymmetric heat conduction in this model with greater heat current in the direction of mass increase. The increase of temperature gradient, mass gradient and system size axe found to enhance the asymmetric heat conduction. Based on the collision dynamic of a haxd-point particle, we give a qualitative explanation for the underlying mechanism of asymmetric effect.     

积分流在消没定理中的应用

本文在几何测度论的框架下,运用变分法的技巧,在一些几何条件下,证明了一些流形中稳定积分流的不存在性,由此导出这些流形中同调群消没.