生物质炭作为一种高效的、低成本的吸附剂,在重金属污染水处理领域引起了人们的广泛关注和研究.文章首先综述了在不同原料、热解温度及热解时间条件下生物质炭的理化性质的差异,然后阐明了生物质炭吸附重金属Pb(Ⅱ)的主要影响因素,分别是生物质炭投加量、反应溶液温度、pH值和重金属Pb(Ⅱ)初始浓度,最后提出了对生物质炭进一步的研究需求和未来的研究方向,以供参考.

废弃物再生生物质炭在改性处理后,比表面积、孔径、孔容积、官能团、疏水性以及微观形貌等都会发生很大变化,作为一种低成本高效吸附剂,在废水处理领域应用广泛.针对近几年的相关文献,介绍了生物质炭通过活化法和复合法改性后在废水处理领域的最新进展;着重分析了改性生物质炭在氮和磷污染废水、重金属污染废水、酚类物质及多环芳烃污染废水、抗生素污染废水及有机染料污染废水领域的应用;最后提出了未来生物质炭废水处理领域的研究方向和发展趋势,以期为生物质炭在废水处理领域的应用提供思路和参考.

Using traffic scene overlooking photography diagram can rapidly and accurately record the information,and through software image processing,it has very important significance for accident analysis and the division of responsibilities.And the scene of the overlook photography diagram after geometry correction,singles image exist field of view small,local scene has less information shortcomings,so it needs image mosaic to get more field information.Therefore,it first proposes fast grid matching phases,there is some overlap multiple images to achieve the rapid matching,and then proposes a fast image fusion method,to achieve seamless integration of multiple images,the last example of a way to prove the robustness of the method is validity and good.It's a very good method to meet the large volume of traffic on-site image analysis and processing requirements.

The aim of this study is to compare the effect of chitosan conduit combine with bone marrow stromal cells(BMSCs) in different density on complete spinal cord transection of rat repair.BMSCs of rat were isolated and cultured in vitro and then transplanted into complete spinal cord transection at T8 of rat combine with chitosan conduit in density of 104/mL(group A),106/mL(group B) and 108/mL(group C).Twelve weeks later,the electrophysiological assessment showed that motor evoked potentials could be recorded on the gastrocnemius muscle by stimulation on either of the cerebral cortex or lower injured site in all groups.The latency period of the cerebral cortex in group C was significantly shorter than that in group A,and the amplitude of the cerebral cortex in groups B and C was higher than that in group A(P <0.05).Gross observation showed the transplants can connect the stumps across the gap in the spinal cord.Nissl's staining showed the number of neurons at the mid-portion of the regenerated tissue in group C was bigger than that in groups A and B(P <0.05).Double fluorescence immunohistochemistry study showed the regenerated axons could cross the glial scar and migrated to the distal stump.Transmission electron microscopy of the regenerated tissue showed many regenerated myelinated nerve fibers.The number of myelinated nerve fibers in group C was bigger than that in group A,and myelin sheathes in group C were thicker than groups A and B(P <0.05).The synthetic grafts composed of BMSCs and chitosan conduit can bridge the damage caused by spinal cord injury,make electrophysiological characteristics recovery to a certain degree,and promote regeneration of axons.Among all groups,group C with high density of BMSCs provide better repairing effect,suggesting that implantation may become a promising approach to the repair of spinal cord injury.

基于单片机系统的倒车雷达以ARM单片机为主控,由超声波检测模块、摄像头图象采集模块、通信模块、显示模块和LINUX人机交互界面组成。超声波检测模块具有温度补偿功能,大大提高了倒车雷达测距的精度。经过实际电路调试,倒车雷达的测距效果良好,显示界面优美。