MOLECULAR STRUCTURES AND SINGLE CRYSTAL ESR SPECTRA OF IMIDAZO-LATE-BRIDGED Co(Ⅲ)-Cu(Ⅱ)-Co(Ⅲ)AND Co(Ⅲ)-Zn(Ⅲ)-Co(Ⅲ) COMPLEXES

The structures of the heterotrinuclear complexes, [(NH_3)_5ColmCu(dien)ImCo(NH_3)_5]-(C10_4)_6·4H_20 and [(NH_3)_5CoImZn(dien)ImCo(NH_3)_5]-(ClO_4)_6·4H_2O, are reported. Co--Cu--Cocrystallizes in the monoclinic space group C2/c with a =32.414(4), b= 9.421(1), c=15.167(5)?,β= 90.91(2)°, Z=4 and Co--Zn--Co in the same space group with a = 32.578(2), b = 9.419(1), c = 15.125(3)?, β=91.10(1)°Z=4. The Cu(Ⅱ) and Zn(Ⅱ) geometriesare intermediate between a trigonal bipyramid and a square pyramid,the Co(Ⅲ) is a-hexagonal coordination and the dien ligand shows a disordered contribution in the respectivestructure.The magnetic properties of Co--Cu--Co are investigated. From the single crystalESR spectra studies, the anisotropic g and A tensors and electronic spin-density of Co--Cu--Co are obtained and the nature of the bonding for Cu~(2+) is discussed.     

制备二氮杂冠醚和三氮杂冠醚的新方法

以糖精为原料合成二氮杂冠醚和三氮杂冠醚。使糖精与二甘醇或三甘醇二氯化物和N,N-二(β-氯乙基)丁胺的DMF溶液在少量碘化钾存在下烃化、氨解,再用二甘醇或三甘醇的二对甲苯磺酸酯烃化生成保护的冠醚环。后者与20％盐酸作用除去保护基生成游离的环体。此法合成路线短原料价廉易得。二氮杂18-冠-6总产率37％左右。     

N-取代苯基-N′-（1-甲基-3-乙基-4-氯-5-吡唑甲酰基）（硫）脲的合成及其杀螨活性

利用活性结构拼接原理,将高效杀螨剂吡螨胺分子的吡唑环部分引入酰基(硫)脲化合物的分子中,合成了6个新的N-取代苯基-N′-(1-甲基-3-乙基-4-氯-5-吡唑甲酰基)脲(2a~2f)和6个新的N-取代苯基-N′-(1-甲基-3-乙基-4-氯-5-吡唑甲酰基)硫脲(3a~3f),收率44%~89%。2和3的结构经1H NMR,IR和元素分析表征。用叶片浸液法测定了2和3对红蜘蛛的毒杀作用,初步实验结果表明它们有一定的杀螨活性。     

ESR STUDY OF FREE RADICALS IN IRRADIATED POLYAMIDE-1010

Polyamide-1010 samples were irradiated in vacuum at room temperature by Cobalt-60 γ-rays. The free radicals formed in irradiation were studied by means of electron spin resonance (ESR)techniques.The ESRspectra consisted of a quartet and a superimposed singlet which were attributed to radical -CO-NH-CH-CH_2 and -CH_2-C=O, respectively. The effects of temperature and crystaUinity on the radicals were discussed and the mechanism for the production and decay of the radicals was also proposed.     

过抽样M通道小波星图去噪方法研究

小波图像去噪已经成为目前图像去噪的主要方法之一,在分析了小波变换的基本理论和小波变换的多尺度分析基础上,根据多尺度小波变换的多分辨特性,提出了过抽样M通道小波变换去噪方法,并将此方法用于星图降噪处理中,收到良好的效果.     

广义Ф-增生算子最速下降迭代序列的收敛定理

证明了任意实Banach空间广义Ф-增生算子的最速下降迭代序列的收敛定理,推广了Zeiqing Liu和周海云等人的近期结果.     

三氯化镧抗小鼠肝癌作用的整体药效学研究

探讨LaCl3对小鼠原位移植性肝癌的抗肿瘤作用.通过直接注射法建立小鼠肝原位移植瘤模型,于造模后第二天开始给药,每天分别以1.0,0.5,0.1 mg·kg-1LaCl3,0.1 mg·kg-1LaCl3和10 mg·kg-15-Fu,20 mg·kg-15-Fu腹腔注射,连续给药10d,通过抑瘤率测定,生存期观察,及瘤组织坏死程度分析来检测LaCl3,的抗肝癌作用.结果显示,0.5 mg·kg-1及联合用药组可明显抑制小鼠肝癌的生长,并显著延长小鼠生存期.LaCl3对小鼠原位移植性肝癌有显著的抗肿瘤作用.     

MEMS材料的微米尺度力学性能试验

以多晶硅薄膜为例综述MEMS材料力学性能测试的基本方法：压痕法，悬臂梁法 ，膜压力膨胀试验法及拉伸试验法，比较讨论了各自的优缺点，并介绍了该领域的最新进展。