电磁场对水平连铸Al-1Si合金线材组织和性能的影响

研究了工频电磁场对水平连铸10 mm的Al-1Si合金键合线铸坯表面质量、凝固组织、溶质偏析和力学性能的影响.试验结果表明,在工频电磁场作用下,铸坯的表面质量得到了改善,当励磁电流达到100 A时,表面粗糙度由未施加电磁场时的40 μm降为20 μm;凝固组织得到了细化,晶粒尺寸均匀;溶质偏析得到了抑制,Si元素在α（Al）基体中的固溶度及其分布的均匀性得到提高;并且力学性能得到了改善,抗拉强度和伸长率分别提高了16.5%和36%.     

钢中非金属夹杂物控制技术发展现状及展望

钢中夹杂物的数量、尺寸、分布规律对钢产品质量有较大影响,因此,控制钢中非金属夹杂物是冶炼高品质洁净钢、提升产品品质的关键。通过对钢中非金属夹杂物性质、来源入手,分析了夹杂物碰撞、聚合长大、上浮及去除机理,同时对气泡吸附、电磁净化、过滤分离等夹杂物控制技术进行了对比分析,并对氧化物冶金技术发展现状进行了介绍。研究表明,气泡法与过滤法是以气泡和过滤器为媒介对钢水中夹杂进行吸附、捕捉并促进其进入渣相;电磁净化法借助电磁场离心力增加夹杂物碰撞、聚集长大的几率,但设备较为复杂,其应用受电力资源供给限制;夹杂物改性技术是将高熔点夹杂变性生成低熔点夹杂,促进夹杂物上浮,其操作简单,但容易造成钢水的二次污染。氧化物冶金技术通过改变夹杂物大小、形状和分布来钉扎和抑制高温下奥氏体晶粒的长大,避免粗大晶粒的形成,从而实现细化组织、提高钢的强度和韧性的目的。氧化物冶金技术为夹杂物的控制提供了新思路,具有重要的应用前景。     

制造有意味的新形式

如果说艺术的创新只是设计师的自觉要求，是设计师寻找新鲜的艺术语言，来创造“新的有意味的形式。”那么包装设计的创新不仅如此，它还是时代的必然要求。艺术不必追随时尚，也没有引领时尚的义务。而在现代生活必需品中，包装和时尚是紧密联系的，在众多的社会时尚现象中，包装的时尚是占据主要位置的，但是回顾包装的设计历史，这又使得包装总是某个年代的最明显和有意义的象征符号，它不仅能反映当时的社会背景、经济状况，也能表达这一时代精神内涵和美学风尚。包装设计的创新因此而具有了深刻的人文意义。     

一种应用于光缆外破在线监控的模式识别方案

电力通信网络线路常因沿途的工程机械施工,人为外力破坏等行为造成毫无预警的危害和损坏。为了实现对线路外破隐患高效预警,需要在现有预警定位的基础上,加上对碰撞敲击、管孔侵入、机械施工和开盖报警等行为的识别。将分布式光纤传感技术、梅尔频率倒谱系数和径向基神经网络相结合,提出一种可应用于光缆外破在线监控的模式识别方案。测试的总体识别率达97.78%,现场模拟的事件报警准确率高。该方案可广泛应用于长距离管线检测领域。     

矿用蓄电池电机车运输大型综采设备的实践

介绍了在井下轨道运输系统采用CAY25/9P型蓄电池电机车运输大型综采设备的方法.如此,解决了架线式电机车牵引力不足的问题.     

一步法制备镁铝水滑石晶须

研究了超声一步法制备水滑石试样。采用扫描电镜和X-射线能谱仪分析所得试样。发现采用超声一步法可以制备出水滑石晶须。镁铝水滑石中Mg2＋与Al^3＋的摩尔比并不严格为3：1，晶须状水滑石的摩尔比大于无定型水滑石中Mg2＋与Al^3＋的摩尔比。     

The enhanced anticoagulation for graphene induced by COOH+ ion implantation

Graphene may have attractive properties for some biomedical applications, but its potential adverse biological effects, in particular, possible modulation when it comes in contact with blood, require further investigation. Little is known about the influence of exposure to COOH⁺-implanted graphene (COOH⁺/graphene) interacting with red blood cells and platelets. In this paper, COOH⁺/graphene was prepared by modified Hummers'' method and implanted by COOH⁺ ions. The structure and surface chemical and physical properties of COOH⁺/graphene were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and contact angle measurement. Systematic evaluation of anticoagulation, including in vitro platelet adhesion assays and hemolytic assays, proved that COOH⁺/graphene has significant anticoagulation. In addition, at the dose of 5 × 10¹⁷ ions/cm², COOH⁺/graphene responded best on platelet adhesion, aggregation, and platelet activation.     

长历时降雨入渗对多台阶排土场边坡稳定性影响研究

降雨是边坡滑坡失稳的主要诱发因素之一。由多相土石混合料构成的人工排土场边坡因其滞水蓄水特性,在长历时降雨条件下极易发生滑坡事故。以充沛雨量地区某排土场为例,分析了长历时降雨造成现状单台阶高陡边坡临界失稳的原因。在此基础上,以经优化设计后的多台阶边坡为例,运用非饱和土力学方法,开展长历时降雨条件下瞬态渗流场演化规律及其对边坡稳定性影响研究。研究结果表明,长历时降雨条件下,单台阶浅层滑坡较深层滑坡更易发生失稳,下部台阶边坡受降雨影响的程度较上部台阶更大,停雨阶段各台阶边坡稳定性恢复速率相对较缓。优化控制排土段高和坡度、修建截排水设施等可有效维护排土场边坡的稳定性。     

Low energy ion beam assisted deposition of controllable solid state electrolyte LiPON with increased mechanical properties and ionic conductivity

Lithium phosphorus oxynitride (LiPON) solid state amorphous film electrolytes were synthesized by ion beam assisted deposition (IBAD) using Li₃PO₄ target under nitrogen reactive plasma. IBAD presents an advantage of controllable nitrogen content of the films by adjusting N₂ and Ar flow ratio. X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), nanoindenter, and profiler were employed to characterize LiPON films. Our results indicate that the film at N₂ and Ar flow ratio of 1:8 showed the best surface morphology and mechanical properties. The highest N atomic percentage of 2.32% was also obtained at this synthesis circumstance, and the resultant LiPON film electrolyte showed higher ionic conductivity of 4.5 × 10⁻⁶ S/cm at room temperature, as well as the highest hardness of 6.8 GPa and the lowest compressive stress of 147.2 MPa. It is believed that as-prepared LiPON solid state electrolyte film optimized can effectively prevent delamination from electrodes, showing some promising application in thin film lithium ion batteries.