“结构-隔热”一体化复合墙板(SIW墙板)是一种新型粮食平房仓墙体构件,由内、外叶混凝土墙和保温板通过连接件组成。为研究粮食侧压力作用下SIW墙板力学性能的可靠性及随机参数的灵敏度,建立了有限元分析模型,以内叶墙挠度和混凝土强度...“结构-隔热”一体化复合墙板(SIW墙板)是一种新型粮食平房仓墙体构件,由内、外叶混凝土墙和保温板通过连接件组成。为研究粮食侧压力作用下SIW墙板力学性能的可靠性及随机参数的灵敏度,建立了有限元分析模型,以内叶墙挠度和混凝土强度不同控制条件的功能函数为失效准则,采用蒙特卡洛拉丁超立方抽样方法,对影响SIW墙板承载力的随机输入参数按分布类型开展了100000次抽样及计算,分析了SIW墙板的可靠性,量化了随机参数的灵敏度。研究结果表明:有限元模拟结果与试验结果相差不足5%,功能函数失效概率分别为P f1=5.02×10^(-2)、P f 2=3.30×10^(-4),建立的有限元模型是有效的,对比规范其可靠度均在安全范围之内,应主要考虑影响混凝土强度失效较大的参数;粮食重力密度、混凝土弹性模量和保温板弹性模量的变化对SIW墙板混凝土强度可靠性的影响较大。研究成果为SIW墙板结构设计及优化提供了参考依据。展开更多
The interaction between β-K 4H 3 [SiW 9O 37(CpTi) 3]·11H 2O and DNA was investigated by agarose gel electrophoresis. The results suggest that β-K 4H 3[SiW 9O 37(CpTi) 3]·11H 2O can degrade the genomic DNA....The interaction between β-K 4H 3 [SiW 9O 37(CpTi) 3]·11H 2O and DNA was investigated by agarose gel electrophoresis. The results suggest that β-K 4H 3[SiW 9O 37(CpTi) 3]·11H 2O can degrade the genomic DNA. The treatment of plasmid DNA with β-K 4H 3 [SiW 9O 37(CpTi) 3]·11H 2O resulted in a fast moving band in front of the three normal conformations(super coiled DNA, linear DNA and relaxed circular DNA) in agarose gel electrophoresis . These results indicate that this chemical material may have the ability to specifically cleavage DNA or to alter conformation of DNA molecules.展开更多
The title compound H2SiW12O40·(CH3)2NH was synthesized in mixed solvent of aqueous and acetonitrile, and its crystal structure had been determined using single crystal X ray diffraction. The crystal belongs to mo...The title compound H2SiW12O40·(CH3)2NH was synthesized in mixed solvent of aqueous and acetonitrile, and its crystal structure had been determined using single crystal X ray diffraction. The crystal belongs to monoclinic, space group C2/m, a=2.0654(4)nm, b=1.3306(3)nm, c=1.3194(3)nm, β=119.59(3)°, V=3.1531(11)nm3, Dc=3.606Mg·m-3, Z=2, R=0.0462, Rw=0.0836. The title compound comprises of a 2+ unit, a polyanion and a free (CH3)2NH molecule. The ESR spectrum of the title compound shows that charge transfer between organic groups and polyanion takes place under irradiation of the sunlight in solid state. The TG study of the title compound shows that it had four stages of the weight loss, and the increase of the decomposition temperature for the polyanion shows that the stability of the polyanion was enhanced due to the influence of Zn2+ ion. CCDC:175866.展开更多
文摘“结构-隔热”一体化复合墙板(SIW墙板)是一种新型粮食平房仓墙体构件,由内、外叶混凝土墙和保温板通过连接件组成。为研究粮食侧压力作用下SIW墙板力学性能的可靠性及随机参数的灵敏度,建立了有限元分析模型,以内叶墙挠度和混凝土强度不同控制条件的功能函数为失效准则,采用蒙特卡洛拉丁超立方抽样方法,对影响SIW墙板承载力的随机输入参数按分布类型开展了100000次抽样及计算,分析了SIW墙板的可靠性,量化了随机参数的灵敏度。研究结果表明:有限元模拟结果与试验结果相差不足5%,功能函数失效概率分别为P f1=5.02×10^(-2)、P f 2=3.30×10^(-4),建立的有限元模型是有效的,对比规范其可靠度均在安全范围之内,应主要考虑影响混凝土强度失效较大的参数;粮食重力密度、混凝土弹性模量和保温板弹性模量的变化对SIW墙板混凝土强度可靠性的影响较大。研究成果为SIW墙板结构设计及优化提供了参考依据。
文摘The interaction between β-K 4H 3 [SiW 9O 37(CpTi) 3]·11H 2O and DNA was investigated by agarose gel electrophoresis. The results suggest that β-K 4H 3[SiW 9O 37(CpTi) 3]·11H 2O can degrade the genomic DNA. The treatment of plasmid DNA with β-K 4H 3 [SiW 9O 37(CpTi) 3]·11H 2O resulted in a fast moving band in front of the three normal conformations(super coiled DNA, linear DNA and relaxed circular DNA) in agarose gel electrophoresis . These results indicate that this chemical material may have the ability to specifically cleavage DNA or to alter conformation of DNA molecules.
文摘The title compound H2SiW12O40·(CH3)2NH was synthesized in mixed solvent of aqueous and acetonitrile, and its crystal structure had been determined using single crystal X ray diffraction. The crystal belongs to monoclinic, space group C2/m, a=2.0654(4)nm, b=1.3306(3)nm, c=1.3194(3)nm, β=119.59(3)°, V=3.1531(11)nm3, Dc=3.606Mg·m-3, Z=2, R=0.0462, Rw=0.0836. The title compound comprises of a 2+ unit, a polyanion and a free (CH3)2NH molecule. The ESR spectrum of the title compound shows that charge transfer between organic groups and polyanion takes place under irradiation of the sunlight in solid state. The TG study of the title compound shows that it had four stages of the weight loss, and the increase of the decomposition temperature for the polyanion shows that the stability of the polyanion was enhanced due to the influence of Zn2+ ion. CCDC:175866.
