Magnesium matrix nanocomposite reinforced with carbon nanotubes(CNTs/AZ91D) was fabricated by mechanical stirring and high intensity ultrasonic dispersion processing.The microstructures and mechanical properties of th...Magnesium matrix nanocomposite reinforced with carbon nanotubes(CNTs/AZ91D) was fabricated by mechanical stirring and high intensity ultrasonic dispersion processing.The microstructures and mechanical properties of the nanocomposite were investigated.The results show that CNTs are well dispersed in the matrix and combined with the matrix very well.As compared with AZ91D magnesium alloy matrix,the tensile strength,yield strength and elongation of the 1.5%CNTs/AZ91D nanocomposite are improved by 22%,21%and 42%respectively in permanent mold casting.The strength and ductility of the nanocomposite are improved simultaneously.The tensile fracture analysis shows that the damage mechanism of nanocomposite is still brittle fracture.But the CNTs can prevent the local crack propagation to some extent.展开更多
“Civilization”通常被译为“文明”。它是现代人文与社会科学中的核心词汇之一,也是人们考察古今社会演变与思想文化变迁的重要概念工具,因而备受各界关注。学界一般认为,1756年出版的《人类之友或论人口》(L’Ami des hommes, ou Tra...“Civilization”通常被译为“文明”。它是现代人文与社会科学中的核心词汇之一,也是人们考察古今社会演变与思想文化变迁的重要概念工具,因而备受各界关注。学界一般认为,1756年出版的《人类之友或论人口》(L’Ami des hommes, ou Traité de la population)一书中,作者米拉波侯爵(Marquis de Mirabeau, 1715-1789)首创了la civilization这一法语单词,从此逐渐被后世所接受并沿用至今。展开更多
埃马纽埃尔·约瑟夫·西哀耶斯(E m nane Joseph sieys,1748-1836年)是法国大革命中大资产阶级君主立宪派的理论家、督政府和执政府时期的政治家.他从1789年开始投身于大革命,历经数十年的政治风云变幻,亲眼看到资产阶级革命的...埃马纽埃尔·约瑟夫·西哀耶斯(E m nane Joseph sieys,1748-1836年)是法国大革命中大资产阶级君主立宪派的理论家、督政府和执政府时期的政治家.他从1789年开始投身于大革命,历经数十年的政治风云变幻,亲眼看到资产阶级革命的胜利.他是大革命前期那些杰出人物中极少幸存者之一.展开更多
文摘Magnesium matrix nanocomposite reinforced with carbon nanotubes(CNTs/AZ91D) was fabricated by mechanical stirring and high intensity ultrasonic dispersion processing.The microstructures and mechanical properties of the nanocomposite were investigated.The results show that CNTs are well dispersed in the matrix and combined with the matrix very well.As compared with AZ91D magnesium alloy matrix,the tensile strength,yield strength and elongation of the 1.5%CNTs/AZ91D nanocomposite are improved by 22%,21%and 42%respectively in permanent mold casting.The strength and ductility of the nanocomposite are improved simultaneously.The tensile fracture analysis shows that the damage mechanism of nanocomposite is still brittle fracture.But the CNTs can prevent the local crack propagation to some extent.
文摘“Civilization”通常被译为“文明”。它是现代人文与社会科学中的核心词汇之一,也是人们考察古今社会演变与思想文化变迁的重要概念工具,因而备受各界关注。学界一般认为,1756年出版的《人类之友或论人口》(L’Ami des hommes, ou Traité de la population)一书中,作者米拉波侯爵(Marquis de Mirabeau, 1715-1789)首创了la civilization这一法语单词,从此逐渐被后世所接受并沿用至今。
文摘埃马纽埃尔·约瑟夫·西哀耶斯(E m nane Joseph sieys,1748-1836年)是法国大革命中大资产阶级君主立宪派的理论家、督政府和执政府时期的政治家.他从1789年开始投身于大革命,历经数十年的政治风云变幻,亲眼看到资产阶级革命的胜利.他是大革命前期那些杰出人物中极少幸存者之一.
