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建筑师和规划师工作的本质不仅是解决空间的使用问题,更重要的是在探索和创造空间的文化。而这种文化空间的创造不是凭空而来,而是应通过对一定地域的文化与空间的关系研究,针对文化与空间的特色因地制宜地进行再创造的过程。文章以龙门坝旅游村的规划与实践为例有针对性地进行空间文化的再创造。 相似文献
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One of the main target organs for the lanthanides(Ln) is bone. Previous studies revealed that ytterbium(Yb) produced damage to the skeletal system in vivo. But the effects of Yb3+ on bone marrow stromal cells(BMSCs) in vitro had not been reported. In this paper, cell viability, apoptosis, mitochondrial membrane potential(MMP), reactive oxygen species(ROS) and lactate dehydrogenase(LDH) were measured in order to study the effects of Yb3+ on BMSCs. The results indicated that Yb3+ displayed a slight positive effect on the BMSCs viability at concentrations of 1×10–6, 1×10–5, and 1×10–4 mol/L, but turned to decrease the viability of BMSCs at the highest concentration of 1×10–3 mol/L for 24, 48 and 72 h. Yb3+ at 1×10–3 mol/L promoted apoptosis of BMSCs, increased the levels of ROS and LDH, and decreased MMP in BMSCs. It suggested that the precipitate of Yb PO4 might decrease the viability of BMSCs. Yb3+ induced the apoptosis of BMSCs via mitochondrial pathway. The results might be useful for more rational application of Yb-based compounds in the future. 相似文献
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随着机械行业的不断发展,政府开始积极关注机电一体化的发展与应用,并随之出台了许多相关优惠政策,同时还适当加大了资金投入力度,以此促进机械行业的可持续稳定发展。对于PLC技术来讲,在机械电气化管理中加以有效应用,不仅能够提高机械自动化生产效率与水平,还可以推动机械电气自动化技术的更新发展,从而为机械行业实现长远发展奠定坚实的基础。据此,本文主要对在机械电气控制装置中PLC技术的应用进行了深入探究。 相似文献
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采用常温碱性超声波清洗、酸洗和活化的前处理工艺在AZ91D镁合金表面化学镀镍,研究了辅助络合剂氨基乙酸和加速剂巯基乙酸对镀层耐蚀性的影响。结果表明:镀层表面由Ni-P固溶体组成,呈现尖锐的晶态峰,磷原子与镍原子形成置换固溶体,表面平整致密,无明显缺陷。氨基乙酸含量对镀层耐蚀性和腐蚀速率影响不大,随着巯基乙酸含量的增加,镀层腐蚀电位先升高后降低,腐蚀速率整体比镁合金基体慢,镀层总体呈现钝化趋势,在4 g/L时腐蚀电位最高。 相似文献