“手持技术”与化学教学整合的文献统计分析

以《化学教育》《化学教学》《中学化学教学参考》3种期刊为研究对象,通过CNKI搜索和查阅原始文献,从论文作者所在区域、作者单位、论文年代分布、作者合作情况、论文内容等几个方面对2004-2014年有关手持技术与化学教学整合的研究论文进行情报统计分析和评价,从另一侧面探讨了我国手持技术与化学教学整合的历程、现状、存在的问题和发展趋势。     

Synthesis,Crystal Structure,and Biological Activity of 4-Chlorobenzaldehyde (2-trifluoromethylTrifluoromethyl-5,6,7,8-tetrahydrobenzo[4 ,5]-thieno[2,3-d]pyrimidin-4-yl)hydrazone Monohydrate

The novel title compound 4-chlorobenzaldehyde (2-trifluoromethyl-5,6,7,8- tetrahydrobenzo[4,5]thieno[2,3-d]pyrimidin-4-yl)hydrazone monohydrate (C18H14ClF3N4SH2O, Mr = 428.86) has been synthesized by a condensation reaction of 4-chlorobenzaldehyde with (2-trifluoromethyl-5,6,7,8-tetrahydrobenzo[4,5]thieno[2,3-d]pyrimidin-4-yl)hydrazine, and its crystal structure was determined by single-crystal X-ray diffraction. The crystal belongs to monoclinic, space group P21/c with a = 7.4252(7), b = 26.344(2), c = 10.3095(9) , = 109.407(2)°, V = 1902.0(3) 3 , Z = 4, Dc = 1.498 g/cm3 , μ = 0.356 mm-1 , F(000) = 880, the final R = 0.0564 and wR = 0.1681 for 2343 observed reflections with I > 2 (I). X-ray diffraction analysis reveals that the title hydrazone molecule is nearly planar except for the cyclohexene and trifluoromethyl moieties. In the crystal packing, the molecules form stacks by a three-dimensional framework, which results from intermolecular N(3)-H(3)···O(1), O(1)-H(1B)···N(2), O(1)- H(1B)···N(4) and O(1)-H(1A)···F(1) hydrogen bonds via water molecules together with π-π stacking interactions. Molecular geometry of the title compound in the ground state optimized by B3LYP functional with 6-311G** basis sets indicates that the calculations are in agreement with the experimental data. The preliminary bioassay suggested that the title compound exhibits relatively good fungicidal activity against Fusarium oxysporium f.sp.vasinfectum and Dothiorella gregaria.     

Synthesis and characterization of triarylsulfonium salts as novel cationic photoinitiators for UV-photopolymerization

Research on Chemical Intermediates - Using diaryliodonium salts as the arylating reagent and copper as a catalyst, a series of triarylsulfonium salts bearing benzoyl or benzoheterocyclic moieties...     

松花粉中16种常量和微量元素的TXRF对比分析

采用微波消解前处理,全反射X射线荧光分析法(TXRF)同时测定松花粉中16种元素,并对马尾松、云南松、油松、黑松、赤松等五种松花粉中16种元素含量进行了测定与比较。结果表明:五种松花粉中都含有这16种元素;Ca,Ti,Mn,Zn和Rb等五种元素平均含量在不同树种间均存在极显著性差异(p≤0.01);K,V,Fe,Co,Cu和Sr等六种元素平均含量在不同树种间均存在显著性差异(p≤0.05);Cr,Ni,As,Pb和Se等五种元素平均含量在不同树种间不存在显著性差异(p>0.05);研究还表明松花粉具有温性或偏寒凉性药的元素谱征。研究结果可以初步断定,松花粉中这16种元素的含量和树种有关,和生长环境、地域等密切相关。     

EXISTENCE AND NONEXISTENCE OF GLOBAL SOLUTIONS FOR A SEMI-LINEAR HEAT EQUATION WITH FRACTIONAL LAPLACIAN

In this paper,we are concerned with the existence and non-existence of global solutions of a semi-linear heat equation with fractional Laplacian.We obtain some extension of results of Weissler who considered the case α = 1,and h ≡ 1.     

提高CG-V型光速测定仪精度的方法探究

利用CG-V型光速测定仪测量光速时,该仪器实验精度除了与频率和光程差的准确测量有关外,还由相位差的判断决定。由于仪器操作不当,产生了虚假的相移,造成误差的产生。本次实验通过对光速测定仪调节过程的细化,提出了可以提高CG-V型光速测定仪精度的调节方法——光斑定位法。     

酶催化光度法测定异丙肾上腺素

试验表明:在pH 9.5氨水-氯化铵缓冲介质中,牛血红蛋白对过氧化氢与酸性络蓝K的氧化还原反应的催化作用因异丙肾上腺素的存在而被抑制,而且其抑制率与异丙肾上腺素的浓度在8.1×10~(-8)～1.2×10~(-5)mol·L~(-1)范围内呈线性关系,其检出限(3S/N)为2.2×10~(-9)mol·L~(-1)。据此,提出了一种简单而灵敏的测定异丙肾上腺素的酶催化光度法。此方法已用于盐酸异丙肾上腺素注射液中异丙肾上腺素含量的测定,并以此样品为基体用标准加入法作回收试验,测得回收率在92.8%～105.4%之间,测定值的相对标准偏差(n=5)在2.6%～5.8%之间。     

阴离子开放骨架磷酸盐[Al_4P_5O_(19)(OH)][C_6H_(18)N_2]和[Ga_8P_8O_(32)F_(5.5)][C_6H_(18)N_2]_2[H_3O~+]_(1.5)水热合成中的对映体拆分

以外消旋的2-甲基-1,5-戊二胺(MPMD)为结构导向剂,在水热条件下合成出新磷酸铝化合物[Al4P5O19(OH)][C6H18N2](AlPO-MPMD)和新磷酸镓化合物[Ga8P8O32F5.5][C6H18N2]2[H30+]1.5(GaPO-MPMD).采用单晶x射线衍射结构分析、粉末x射线衍射分析(XRD)、热重-差热分析(TGA-DTA.A)、固体核磁共振(MAs NMR)、旋光分析(Optical rotation)以及振动圆二色光谱分析(Vibrational circular dichroism,VCD)等技术对产物进行了表征.对产物的VCD实验光谱和理论模拟光谱对比分析及旋光分析表明,在水热合成过程中,具有S构象的手性结构导向剂分子比具有R构象的手性结构导向剂分子更多地进入无机化合物骨架中,显示了手性对映体分子在该水热条件下的原位手性拆分.     

以泡沫镍载NiCo2O4纳米线阵列为阴极催化剂的Al-H2O2半燃料电池

研究了以泡沫镍载NiCo2O4纳米线阵列为阴极催化剂的Al-H2O2半燃料电池的性能. 以无模板生长法制备了泡沫镍载NiCo2O4纳米线阵列阴极材料, SEM测定结果表明, NiCo2O4纳米线几乎垂直于泡沫镍载体表面生长. 以电压和功率密度-电流密度曲线研究了H2O2浓度、电解液流速和温度对电池性能的影响, 结果显示, 以铝片为阳极, 0.6 mol/L H2O2为氧化剂的电池的开路电压约为1.40 V; 在室温和57 ℃下, 电流密度为98和172 mA/cm2时, 最大功率密度分别达到79和120 mW/cm2.  在5000 s的测试时间内, 0.70 V的恒电流密度和75 mA/cm2 的恒电压值几乎为一常数, 这表明以泡沫镍载NiCo2O4纳米线阵列为催化剂电还原H2O2具有很好的活性、稳定性和传质性能.