The influences of poly(lactic-co-glycolic acid) (PLGA) coating on the biodegradability, bioactivity, and biocompatibility of calcium silicate bioceramics

Calcium silicate (CaSiO₃) bioceramics and polyesters have complementary qualities as potential bone substituted materials. In this study, sintered CaSiO₃ bioceramics were prepared and coated with poly(lactic-co-glycolic acid) (PLGA), and the influences of the PLGA coating on the degradation, hydrophilicity, bioactivity, and biocompatibility of CaSiO₃ ceramics were investigated. The results showed that the degradation rate was reduced, while hydrophilicity was decreased with the increase of the polymer coating. In addition, the polymer coating resulted in a decrease of the alkaline pH value during the degradation of the ceramics, which indicated an increase of the cell biocompatibility, confirmed by the attachment and proliferation of rMSCs on the surface of the polymer-coated ceramics. Furthermore, the apatite-forming ability of the PLGA-coated CaSiO₃ bioceramics was maintained. This study suggested that the coating with PLGA might be a useful method to improve the integrative properties of CaSiO₃ bioceramics for applications in bone regeneration and bone tissue engineering.     

南宁市某工程基础选型及地基处理设计

南宁市某工程基础持力层（圆砾层）埋深较浅,距基底设计标高仅2m～4m,给基础设计带来一定难度。通过基础多方案比选,最终选择CFG桩复合地基,可供类似工程参考。     

断片之后的整体——析卡罗·斯卡帕的维罗纳古堡艺术博物馆修复工程

针对那些认为卡罗·斯卡帕的建筑是＂工匠＂化的观念,曼费雷多·塔夫里指出：当存在断片的时候,必然有与之相关的整体理解,斯卡帕的建筑是一种新完成模式。以维罗纳古堡修复项目为例,解释斯卡帕建筑设计中断片形式操作和整体理念的关系以及相对应的建筑设计方法。     

景观是个玩意儿

景观在市场和设计知识分子的价值观之间做怎样的选择？当代设计的尴尬……     

哈密硅灰石在连铸结晶器保护渣中的应用与研究

采用新疆哈密地区矿产资源硅灰石、长石、萤石等配制了适合当地炼钢企业使用的连铸结晶器保护渣.讨论了CaO、Al2O3、MgO、F及Na2O对连铸结晶器保护渣熔点、黏度的影响,并对所做的渣样进行了XRD及SEM表征.     

河南省民政厅综合办公楼数码多联空调工程设计

本文着重介绍了数码涡旋技术在商用办公楼的设计及应用,该工程能在一年四季提供稳定的制冷和制热,充分体现数码涡旋技术的广泛适用性、节能可靠性、控制便利及精确性,具有安装和后期维护简单方便等突出优点。     

新安煤矿16采区回风联巷快速揭煤技术应用

突出煤层揭煤是煤矿采掘生产中的复杂作业过程,其具有突出威胁大、破坏强度高、施工周期长的缺点,应用安全有效的快速揭煤技术对矿井的安全生产和采掘接替意义重大。使用水力压裂、水力冲孔等消突增透措施后再预抽揭煤区域瓦斯,最终实现快速揭煤,为严重煤与瓦斯突出煤层快速揭煤积累了经验。     

高机动目标对雷达检测的影响分析

针对无人飞机、导弹、卫星等高速目标机动飞行的特点,分析了目标飞行过程中相对雷达径向速度、径向加速度以及加加速度随时间的变换关系,并利用高次幂相位回波信号建立了信号模型,研究了高次相位对常规方法进行目标检测的影响,获得了最佳积累脉冲数与信噪比、加加速度的关系;最后,提出一种利用短时分数阶傅里叶变换(STFRFT)对三次相位信号进行分析和参数估计的方法,仿真表明该算法处理性能高于傅里叶变换,可为实际雷达检测高机动目标提供理论参考。     

去皮芋头的魔芋涂膜保鲜研究

将魔芋葡甘聚糖应用于去皮芋头的涂膜保鲜中 ,结果表明经 0 .2 %维生素C、0 .2 %柠檬酸、0 .5 %连二亚硫酸钠护色液处理后的芋头 ,清洗后再用 0 .4 %涂膜液处理 ,能使芋头在室温下贮藏期达 9天 ,真空包装后可贮藏 2 0多天之久。     

A blackboard system for the off-line programming of Robots

This paper describes the use of the blackboard architecture for the off-line programming of an IMB 7565 Robot. A blackboard system was implemented in PROLOG and it has been applied successfully for the automatic generation of a control code for the robot to perform the task of block assembly in an environment with an obstacle. The opportunistic type of problem-solving offered by the blackboard architecture has succeeded in obtaining a solution. The user-interface to the system is represented as a knowledge source in the blackboard system, which allows the user to modify the goal specifications during the operation of the blackboard system.