Injectable silk/hydroxyapatite nanocomposite hydrogels with vascularization capacity for bone regeneration

Localized and sustained osteogenic-angiogenic stimulation to bone defects is critical for effective bone repair.Here,desferrioxamine(DFO)was loaded on silk fibroin nanofibers and blended with hydroxyapatite nanorods(HA),forming injectable DFO-loaded silk fibroin-HA nanocomposite hydrogels.The composite hydrogels remained homogeneous distribution of HA with high ratio(60%)and also higher stiffness than that of pure silk fibroin nanofiber hydrogels,which provided stable osteogenic stimulation niches for tissue regeneration.Without the scarify of injectability,the hydrogels achieved slow delivery of DFO for above 60 days,resulting in suitable angiogenesis in vitro and in vivo and better osteogenesis than DFO-free systems.Compared to previous injectable silk fibroin-HA hydrogels,the introduction of vascularization capacity further stimulated the osteogenic differentiation of stem cells and accelerated new bone formation.Quicker and better bone healing were detected at defect sites after the injection of DFO-loaded nanocomposite hydrogels,indicating the effective synergistic effect of osteogenic and angiogenic cues.This work provides a simple and effective strategy of introducing angiogenic cues to bone matrices.We believe that the injectable nanocomposite hydrogels are suitable for the regeneration of bone tissues.     

The characteristics of waves around an entrance of a lagoon in South China Sea

The characteristics of the waves around a lagoon entrance in South China Sea were observed during the past one and half years based on the wave measurements.The...     

222Rn在大气输运研究中的示踪应用

本文简要回顾了222Rn及其子体示踪应用的主要方面,介绍了国内外对利用222Rn及其子体在预报地震和大气物质输运研究这两方面的工作.对这些示踪应用而言,要进行准确的定量分析和数值模拟,必须对222Rn及其子体在大气中的输运规律有细致的了解,这一点可以通过研究其动力学特征,建立输运模型来实现.本文中列举了部分对222Rn及其子体输运模式的研究,对比上层大气中的简单输运模型,一个比较全面的222Rn输运模型还需要考虑地表层结大气中的复杂的动力学因素,并将其作为222Rn在上层大气输运模型中的下垫面边界条件.     

捷联式惯导系统在车辆监控中的实现与应用

在道路交通飞速发展的今天,道路安全问题日益成为社会关注的焦点。特别是危化品货物的道路运输安全问题,已成为交通运输管理部门面临的重大难题。依据捷联式惯导系统和四元数法,提出车辆实时监控模型,并应用在危化品运输智能监控平台中。实验结果表明该模型是有效可行的。     

The globally asymptotic stability analysis for a class of recurrent neural networks with delays

This paper considers the problem of global stability of neural networks with delays. By combining Lie algebra and the Lyapunov function with the integral inequality technique, we analyze the globally asymptotic stability of a class of recurrent neural networks with delays and give an estimate of the exponential stability. A few new sufficient conditions and criteria are proposed to ensure globally asymptotic stability of the equilibrium point of the neural networks. A few simulation examples are presented to demonstrate the effectiveness of the results and to improve feasibility.     

掺杂荧光染料的高亮度有机蓝光电致发光器件

利用蓝色发光材料DPVBi掺杂高荧光染料rubrene做发光层制备了蓝色发光器件.在掺杂浓度为1.5%(wt)左右的情况下,当改变掺杂层的总的厚度时,器件的亮度、效率和色坐标都有明显的改变.当掺杂层DPVBi和rubrene的厚度为40nm,电子传输层Alq3的厚度为20nm,器件所加的电压是13v时,其最大亮度为14000cd/m2,此时的色坐标为(0.24,0.24),为蓝光发射.这种掺杂明显的提高了蓝光器件的发光效率.使最大效率达到2.5cd/A.     

可靠性计算中加快蒙特卡罗仿真收敛速度的方法

针对电力系统概率分析中蒙特卡罗仿真效率不高的问题,考虑到大型发输电组合电力系统可靠性计算的特点,采用改进的控制变量法来减小样本方差,综合考虑了影响抽样结果准确性和计算速度的诸多因素,如系统风险水平、收敛判据、控制变量的选择以及参数选定等,并将评估范围由系统指标扩展到节点指标。在IEEE RTS系统的测试结果表明,所提算法严谨、实用,计算效果明显,具有良好的应用价值。     

一种新型设备用断路器——NDB3的结构原理及应用

介绍了液压-电磁式设备用断路器的工作原理、产品特点及其在典型行业中的应用,阐述了这一区别于传统热磁式断路器的优点,及在通信行业中的典型应用。     

炸药冲击波激励氩气闪光实验研究

建立了对可见光和近红外的瞬态测试记录系统。用实验方法研究了氩气在炸药冲击小励下产生的可见光光强。测得了不同压力下氩气的辐射强度,分析了气体压力对光强的影响。