摘要：在以大掺量湿磨改性磷石膏浆体、粒化高炉矿渣粉为主要原料制备过硫磷石膏矿渣水泥(PPSC)的基础上,以力学性能为导向,设计制备了过硫磷石膏矿渣水泥路面基层材料(PGBM),并对其微观结构及力学性能进行了研究.结果发现:PPSC含有矿物相石英(α-SiO_(2))、二水石膏(CaSO_(2)·2H_(2)O)和水化产物钙矾石(Ettringite)3种主要矿物成分;PPSC的矿物成分和微观结构特点影响着PGBM的无侧限抗压强度,进而影响PGBM的水稳性,但PGBM与PPSC的无侧限抗压强度增长率保持一致,且PGBM的抗冲刷能力与其无侧限抗压强度发展规律也具有一致性;不同配比的各组基层试件水稳性较好,其软化系数均大于90%;PPSC掺量为5%时,PGBM的7 d无侧限抗压强度即可满足路面基层强度的规范要求,而PPSC掺量为15%的PGBM在28 d龄期时出现无侧限抗压强度下降和冲刷量升高现象,分析原因是由于PPSC内部过量钙矾石的形成导致试件膨胀开裂所致.

摘要：Sudden earthquakes pose a threat to the running safety of trains on high-speed railway bridges,and the stiffness of piers is one of the factors affecting the dynamic response of train-track-bridge *** this paper,a experiment of a train running on a high-speed railway bridge is performed based on a dynamic experiment system,and the corresponding numerical model is *** reliability of the numerical model is verified by ***,the experiment and numerical data are analyzed to reveal the pier height effects on the running safety of trains on *** results show that when the pier height changes,the frequency of the bridge below the 30 m pier height changes greater;the increase of pier height causes the transverse fundamental frequency of the bridge close to that of the train,and the shaking angle and lateral displacement of the train are the largest for bridge with 50 m pier,which increases the risk of derailment;with the pier height increases from 8 m to 50 m,the derailment coefficient obtained by numerical simulations increases by 75% on average,and the spectral intensity obtained by experiments increases by 120% on average,two indicators exhibit logarithmic variation.

摘要：以内蒙古长城五矿的实际生产情况,针对“三下”压煤开采问题,设计了连采连充自流充填工艺,并将其划分为“制浆”“输矸”两部分。制浆站可在计算机控制下实现全自动生产,并采用可视化技术对制浆系统运行状态进行监控。并在采区现场进行组装、调试与运行。最后对充填效果进行分析,证明了连采连充自流充填工艺在长城五矿充填开采作业中是完全可行的,实现了矿井绿色开采,可以有效解决长城五矿“三下”压煤问题。

摘要：合成生物学/工程生物学通过设计、搭建生物部件甚至生物系统来构建具有新功能的人工生命.其研究内容主要分为3个层次:(1)将现有的天然生物模块进行设计和组装,构建不同于天然存在的调控网络,从而实现新功能;(2)通过人工基因组DNA的全合成进行新生命的构建;(3)通过化学合成部件(修饰核酸、蛋白质、脂类等)创建全新的生物系统乃至生命体.第3个层次的研究也称为化学合成生物学,本文主要集中讨论化学合成生物学中将非天然核酸替代DNA作为遗传物质从而构建人工生命的研究,简要介绍了非天然核酸化学修饰对其遗传物质功能的影响,及以其为基础的人工生命构建的研究现状.这将为我们探讨生命起源、进化甚至外星生命等问题提供新的思路.