随着经济的快速发展,劳动力市场也会越来越规范,实行市场准入制度在不远的将来势在必行。组织学生参加技术等级考试,有力于促进学生的技术训练,培养学生的动手操作能力,对学
<正>近年来,南平市养猪生产发展势头强劲。大多数种猪场都在不同程度地进行扩群繁育工作,但是由于重引种,轻选育,选育工作不到位,繁育体系不完善,猪群遗传水平逐年下降,最终
Nanostructured Bi2Se3 and Sn0.5·Bi2Se3 were successfully synthesized by hydrothermal coreduction from SnCl2-H2O and the oxides of Bi and Se. The products w
Eutectic nucleation in hypereutectic Al-25wt.%Si alloy with the addition of P was studied by calculating the activation energy and nucleation work. The results
A neodymium doped yttrium aluminum garnet(Nd:YAG) transparent ceramic was fabricated by a solid state reaction method using commercial α-Al2O3,Y2O3,and Nd2O3 p
目的 目前很多研究发现成熟型脑源性神经营养因子(mature brain-derived neurotrophic factor,mBDNF)和脑源性神经营养因子前体(precursor of BDNF,proBDNF)在脑内分别通
来源于囊胚期胚胎内细胞团的胚胎干细胞具有独特的生物学特性,包括无限自我更新的能力以及分化为内胚层、中胚层和外胚层各种细胞的潜能.阐明胚胎干细胞全能性维持以及向各种
The microstructure and strengthening mechanisms of as-cast Mg-6Al-6Nd alloy were studied. The results show that the addition of 6 wt.% Nd into Mg-6Al alloy lead
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