A New Property of Conjugated Polymer PFP： Catalytic Degradation of Methylene Blue Aqueous Solution

A new property of conjugated polymer poly（furancarbinol-co-phenol）（PFP） was studied. The target copolymer was used as a catalyst after proper heating treatment. And dye methylene blue （MB） could be fully degraded and largely mineralized on PFP, under natural light or even in dark, in a few minutes. Furthermore, the catalytic activity could be preserved after several runs and the catalyst was readily separated. The effect of calcination temperature was also observed.     

利用界面偏析控制沿晶断裂——Ⅱ.晶界偏析与晶间脆性的预测

本文采用准化学方法对于二元合金系导出晶界偏析对沿晶断裂功W影响的表达式,并引入沿晶断裂参量P.当P>0和P<0的杂质分别为脆化及韧化杂质;|P|愈大,脆化或韧化趋势愈大.同时在Seah理论的基础上,提出了4点改进,解决了若干错划问题.     

城市灰尘重金属含量对城市土壤重金属的影响--以金华市为例

为系统了解城市重金属污染特性,采集了金华市不同功能区的城市灰尘与城市土壤样品,获得重金属含量,并对数据进行了统计分析。结果表明：（1）灰尘中重金属含量均高于土壤,含量最高的 Mn,平均质量分数为770．62 mg/kg,其次为 Zn,为696．72 mg/kg。土壤中 Mn 元素质量分数最高,为537．60 mg/kg。（2）灰尘、土壤中重金属均为中等变异,且土壤变异程度高于灰尘,说明土壤中的重金属受外界扰动更大。（3）城市灰尘和土壤中 Zn 元素表现为显著正相关,说明其对土壤有影响, Cu、 Pb 和 Mn 表现为正相关, Nb 基本不相关, Cr 为负相关,但相关性均不显著。     

Synthesis,Crystal Structure and Biological Activity of 8-（（4-（（2,3-diaminopyridin-4-yl）oxy）-3-fluorophenyl）-amino）-2-（4-fluorophenyl）-3-methyl-2,7-naphthyridin-1（2H）-one

The new title compound 8-((4-((2,3-diaminopyridin-4-yl)-oxy)-3-fluorophenyl)-amino)-2-(4-fluorophenyl)-3-methyl-2,7-naphthyridin-1(2H)-one(C26H20F2N6O2, Mr = 486.48) has been prepared and determined by single-crystal X-ray diffraction. The crystal is of monoclinic, space group P21/c with a = 15.365(3), b = 13.144(2), c = 11.863(2), β= 108.882(3)°, Z = 4, V = 2267.0(7)3, Dc = 1.425 g/cm3, F(000) = 1008, μ = 0.105 mm-1, MoKa radiation(λ = 0.71073), R = 0.0480 and wR = 0.1294 for 3197 observed reflections with I 2σ(I). X-ray diffraction analysis reveals that the region C(substituents of 8-amino group and 3-methyl group on the 2,7-naphthyridin-1(2H)-one ring) of compound 6 are effectively planar. Intramolecular and intermolecular hydrogen bonds together with π···π interations are found in the structure. In addition, compound 6 shows potent c-Met and c-Kit kinase inhibition activities.     

基于席夫碱配体和两种苯甲酸盐构筑的两例Dy4配合物的合成、结构及单分子磁体性质

使用Dy(NO₃)₃·6H₂O与席夫碱配体2-(((2-羟基-3-甲氧基苄基)亚氨基)甲基)-4-甲氧基苯酚(H₂L)和2个辅助配体PhCO₂H和2-NO₂-PhCO₂H在乙醇中反应,得到2例Dy₄配合物[Dy₄(L)₄(PhCO₂)₂(NO₃)₂(EtOH)₂](1)和[Dy₄(L)₄(2-NO₂-PhCO₂)₂(NO₃)₂(EtOH)₂](2)。单晶X射线衍射解析表明配合物1和2均由Dy₂基本单元构建,形成中心对称的四核线性链状结构。配合物1和2中Dy₂单元中的一个Dy(Ⅲ)离子呈现七配位几何构型,另一个Dy(Ⅲ)离子呈现八配位几何构型。2例配合物均为单分子磁体,其能垒分别为110和108 K。通过理论计算对1和2的磁性能进行了分析。     

有序介孔锰氧化物催化过氧化氢降解水中诺氟沙星

采用硬模板法制备了有序介孔氧化锰,并用过氧化氢氧化诺氟沙星的降解率及其抗菌活性变化评价了其催化活性.研究发现,有序介孔锰氧化物表现出较高的催化活性;低pH有利于提高其催化活性.与单独过氧化氢氧化过程相比,有序介孔锰氧化物的存在明显减弱了诺氟沙星的抗菌活性.叔丁醇对催化体系的抑制作用表明有序介孔锰氧化物促进了过氧化氢分解生成羟基自由基.通过对诺氟沙星在催化过程中的分解产物鉴定,提出了可能的分解途径.     

金属包层渐变折射率介质光波导的传输特性与损耗

用金属包层介质光波导损耗的微扰理论及藉助多层近似法用递推公式分析渐变折射率波导传播常数的方法,对几种类型的金属包层渐变折射率介质光波导的传输特性与损耗进行分析和讨论,得到了与精确数值计算结果相吻合的结果.     

一种基于Galois联络的逻辑及其等价形式

将形式化方法引入到Galois联络的研究当中,提出了一种基于Galois联络的逻辑系统LGC,给出了其等价形式并证明了完备性定理.由于Galois联络与粗糙集及概念格有着紧密的联系,故本文的结果对概念格及粗糙集的形式化研究有一定的启示作用.     

Influence of glass coating thickness and metallic core diameter on GMI effect of glass-coated Co68Fe4.5Si13.5B14 amorphous microwires

Influences of the size factors (glass coating thickness and metallic core diameter) of microwires on GMI effects of the glass-coated Co₆₈Fe_4.5Si_13.5B₁₄ amorphous microwires were investigated. The results indicated that the GMI effect of the microwires with the same glass coating thickness or the same metallic core diameter was initially increased to a peak and then decreased with an increase in the diameter or the thickness. The glass coating thickness and the metallic core diameter corresponding to the maximum GMI varied with metallic core diameter and glass thickness, respectively. The GMI effect of the microwires with the same geometric size varied remarkably under different cooling rates. Such effect was ascribed to the microstructural changes of the metallic core wire under different cooling rates. The influence of the glass coating thickness on the GMI effect of the microwire was attributed to the synthetical actions of crystallization enthalpy (degree of disorder) and the internal stress.     

掺Gd3+的LiYF4∶Yb3+/Ho3+微米晶体制备以及在防伪中的应用研究

研究一种具有良好上转换发光性能的稀土掺杂发光材料,对于防伪技术领域具有非常重要的意义。为了改善LiYF₄∶Yb3+/Ho3+微米晶体的上转换发光性能,采用水热合成法成功制备了一系列Gd3+掺杂的LiYF₄∶Yb3+/Ho3+微米晶体,并采用X射线衍射(XRD)和扫描电子显微镜(SEM)对样品的相纯度和晶体形貌尺寸进行表征;在980 nm激光激发下,通过荧光光谱测试对LiGd_xY_1-xF₄∶Yb3+/Ho3+微米晶体的上转换发光性能进行分析。首先,研究了LiGd_xY_1-xF₄∶Yb3+/Ho3+微米晶体的晶体结构、尺寸、形貌和上转换发光性能的影响。结果显示,LiGd_xY_1-xF₄∶Yb3+/Ho3+微米晶体样品的XRD衍射峰与四方相的LiYF₄标准卡（PDF#17-0874）特征峰的位置完全对应且没有其他杂峰,SEM实验结果显示晶体形貌为八面体形状,表明成功合成了纯四方相的LiGd_xY_1-xF₄∶Yb3+/Ho3+微米晶体;荧光光谱测试结果显示,样品的上转换发光强度随着Gd3+掺杂比例的升高呈现出先增强后减弱的趋势,并且在Gd3+掺杂浓度为30 mol%时达到最强。其次,进一步研究了Gd3+掺杂浓度30 mol%样品的上转换发光性能与激发功率之间的关系,激发功率为0.5~1.5 W。LiGd_0.3Y_0.49F₄∶Yb3+/Ho3+微米晶体的红色和绿色上转换发光强度之比(R/G)随着激发功率的增加只发生大约12%的变化,样品的上转换发光并没有因为激发功率的增加而发生明显的变色,仍然可以发出稳定明亮的绿色光。这一现象表明,Gd3+的掺入很好地改善了样品的上转换发光性能,这种稳定高效的发光性能保证了其良好的防伪性能。最后,将Gd3+掺杂浓度为30 mol%的LiYF₄∶Yb3+/Ho3+微米晶体粉末与丝网金属油墨按照一定比例混合制成丝网防伪油墨,通过丝网印刷技术在玻璃基底上印制了“西安”字样的防伪标识图案,经过干燥处理后在980 nm激光的激发下,发出明亮且稳定的绿色可见光,制成的防伪标识图案具有发光强度高、易于识别、不易脱落的特点,可被广泛应用于防伪领域。