Bone Tissue Response to the Bone-like Tissue Coating on Titanium

The objective of this study was to investigate the effects of mineralized bone nodules, formed in vitro by bone marrow stromal cells(BMSCs), on the new bone formation in bone defect and on implant surface. The mineralized bone nodules were generated by culture of Lewis rats BMSCs on titanium disks in osteogenic induction medium. The gap-healing animal model was used to create the bone defect facing the disk. The titanium disks in the presence of B group or in the absence of NB group bone nodules were randomly placed into one of the rat distal femurs. This self-control design was used to compare the bone formation in defects and on titanium surface, by Micro-CT, fluorescence staining, histological and histomorphometric analysis. The new bone formation parameters in bone defect area of B group were significantly higher than those of NB group at 2 weeks, including bone volume fraction, trabecular thickness and bone area ratio. The bone nodules pre-stained with Alizarin red disappeared mostly at 2 weeks, while the red fluorescence reappeared in the newly formed bone away from the disk surface. For the bone-implant contact, B group showed lower values than NB group at 2 weeks, but no significant difference was found at 4 weeks. Our results indicate that the mineralized bone nodules can be resorbed in vivo and promote the early osteogenesis in the bone defects, and bone nodules may be applicable for new bone generation in bone defect or modification of tissue engineering scaffold.     

天逸AD-66H合并式放大器的技术和工艺特点

AD-66H 是广州天逸电子有限公司最新推出的一款入门级 Hi-Fi 合并式放大器。这款机是以该公司数年前的一款好评如潮的长青树产品 AD-66A 后级功放为基础,全面继承和发展完善了该机的电路和音质音色取向,并在外观上采取了与天逸 Hi-Fi 机王 AD-2相似的造型风格,而且用料更实在、工艺更精细、音质更细腻耐听,且为 Hi-Fi 发烧友留足玩机、摩机升级的空间。     

基于OTN/DWDM网OSC的1588v2时间同步方案及应用研究

随着5G通信和智能电网的发展,电力自动化设备对时间同步精度、可靠性和部署效率提出更高要求.文章提出一种基于OTN/DWDM网光监控信道(Optical Supervisory Channel,OSC)的1588v2时间同步方案,旨在高效率、高精度、高可靠性实现时间同步部署.介绍了1588v2同步原理,通过对OSC和电监...     

广电云发展之浅析

一云计算简介“云计算”是在当今IT行业炙手可热的名词．通俗地讲。就是将计算及存储设施以及满足某种通用计算的软件平台结合在一起,通过可接受的网络链路依据需求为用户提供不同层次的、     

泡沫玻璃在房屋建筑中的应用及其施工质量控制

本文主要介绍了一种新型的、可用于节能窗玻璃或是建筑维护结构的保温隔热材料——泡沫玻璃,对其主要物理性能、分类、应用技术特点进行了简要分析,并对其在房屋建筑工程应用中的施工准备和施工过程的质量控制进行阐述,以供参考。     

华东电网CPS考核标准运行分析

介绍了华东电网目前频率质量控制的现状和考核标准,结合实际运行数据分析了现行考核标准CPS在实际运行中所表现出的约束效力和其有待改进之处,由分析结果提出了对考核标准的改进方法和今后电网的频率质量控制手段.     

塑封微电子器件失效机理研究进展

塑封器件在现在的封装产业中具有无可比拟的优势,相关研究引起了人们广泛关注.简要介绍了塑封微电子器件的发展史,以及国内外塑封器件可靠性的研究现状.对塑封器件的主要失效机理研究进展进行深入探讨,如腐蚀、分层、开裂等,提出了几种提高塑封器件可靠性的措施.论述了用于塑封器件质量评估的试验方法,并展望了塑封器件在军工领域的潜在应用前景.